feat: Enhance postsync event to include .Error (#882 )

* Refactor postsync event to include success flag * Change success boolean to error Fixes #826
Update templating example typo (#895 )
2026-10-22 16:37:08 +02:00 · 2019-10-17 08:27:12 +09:00 · 2019-10-17 08:25:24 +09:00 · 2019-10-10 16:54:15 +09:00 · 2019-10-10 16:52:32 +09:00 · 2019-10-10 16:51:52 +09:00
274 changed files with 16209 additions and 33920 deletions
@@ -4,31 +4,51 @@ jobs:

  build:
    docker:
-      - image: circleci/golang:1.10.1
-    working_directory: /go/src/github.com/roboll/helmfile
+      - image: circleci/golang:1.13.1
+    environment:
+      GOPATH: /go
+    working_directory: /home/circleci/workspace/helmfile
    steps:
      - checkout
+      - restore_cache:
+          keys:
+          - go-mod-cache-v1-{{ checksum "./go.sum" }}
+          - go-mod-cache-v1-
+      - run: go env
      - run: make build
+      - save_cache:
+          key: go-mod-cache-v1-{{ checksum "./go.sum" }}
+          paths:
+          - /go/pkg/mod
      - persist_to_workspace:
-          root: /go/src/github.com/roboll/helmfile
+          root: ./
          paths:
            - .

  test:
+    environment:
+      GOPATH: /go
    docker:
-      - image: circleci/golang:1.10.1
-    working_directory: /go/src/github.com/roboll/helmfile
+      - image: circleci/golang:1.13.1
+    working_directory: /home/circleci/workspace/helmfile
    steps:
      - checkout
+      - restore_cache:
+          keys:
+          - go-mod-cache-v1-{{ checksum "./go.sum" }}
+          - go-mod-cache-v1-
      - run: make check
      - run: make pristine
      - run: make test

  # thanks to https://raw.githubusercontent.com/weaveworks/launcher/master/.circleci/config.yml
  integration_tests:
-    machine: true
+    machine:
+      image: circleci/classic:201808-01
    environment:
      CHANGE_MINIKUBE_NONE_USER: true
+      MINIKUBE_WANTUPDATENOTIFICATION: false
+      MINIKUBE_WANTREPORTERRORPROMPT: false
    steps:
      - checkout
      - run: mkdir ~/build
@@ -38,7 +58,7 @@ jobs:
      - run:
          name: Install helm
          environment:
-            HELM_VERSION: v2.9.0
+            HELM_VERSION: v2.13.0
          command: |
            HELM_FILENAME="helm-${HELM_VERSION}-linux-amd64.tar.gz"
            curl -Lo ${HELM_FILENAME} "https://kubernetes-helm.storage.googleapis.com/${HELM_FILENAME}"
@@ -49,14 +69,13 @@ jobs:
          name: Deploy minikube
          environment:
            CHANGE_MINIKUBE_NONE_USER: true
-            K8S_VERSION: v1.9.0
-            MINIKUBE_VERSION: v0.25.2
+            K8S_VERSION: v1.12.3
+            MINIKUBE_VERSION: v0.30.0
          command: |
            curl -Lo kubectl https://storage.googleapis.com/kubernetes-release/release/${K8S_VERSION}/bin/linux/amd64/kubectl
            chmod +x kubectl && sudo mv kubectl /usr/local/bin/
            curl -Lo minikube https://storage.googleapis.com/minikube/releases/${MINIKUBE_VERSION}/minikube-linux-amd64
            chmod +x minikube && sudo mv minikube /usr/local/bin/
-            sudo minikube config set WantReportErrorPrompt false
            sudo -E minikube start --vm-driver=none --kubernetes-version=${K8S_VERSION}
            sudo -E minikube update-context
      - run:
@@ -72,16 +91,21 @@ jobs:

  release:
    docker:
-      - image: circleci/golang:1.10.1
-    working_directory: /go/src/github.com/roboll/helmfile
+      - image: circleci/golang:1.13.1
+    working_directory: /home/circleci/workspace/helmfile
    steps:
    - checkout
+    - restore_cache:
+        keys:
+        - go-mod-cache-v1-{{ checksum "./go.sum" }}
+        - go-mod-cache-v1-
    - setup_remote_docker
    - run:
        command: |
          docker login -u="$DOCKER_USER" -p="$DOCKER_PASS" quay.io
          make tools
-          BUILD_URL="$CIRCLE_BUILD_URL" make push release
+          go mod vendor
+          ORG=roboll BUILD_URL="$CIRCLE_BUILD_URL" make push release

 workflows:
  version: 2
@@ -1,3 +1,5 @@
 dist/
 .idea/
-helmfile
+helmfile
+helmfile.lock
+vendor/
@@ -0,0 +1,39 @@
+# DCO + License
+
+By contributing to `helmfile`, you accept and agree to the following DCO and license terms and
+conditions for your present and future Contributions submitted to the `helmfile` project.
+
+[DCO](https://developercertificate.org/)
+[License](https://github.com/roboll/helmfile/blob/master/LICENSE)
+
+# Developing helmfile
+
+Locate your `GOPATH`, usually `~/go`, and run:
+
+```console
+$ go get github.com/roboll/helmfile
+
+$ cd $GOPATH/src/github.com/roboll/helmfile
+
+$ git checkout -b your-shiny-new-feature origin/master
+
+...
+
+$ git commit -m 'feat: do whatever for whatever purpose
+
+This adds ... by:
+
+- Adding ...
+- Changing ...
+- Removing...
+
+Resolves #ISSUE_NUMBER
+'
+
+$ hub fork
+$ git push YOUR_GITHUB_USER your-shiny-new-feature
+$ hub pull-request
+```
+
+Note that the above tutorial uses [hub](https://github.com/github/hub) just for ease of explanation.
+Please use whatever tool or way to author your pull request!
@@ -1,29 +1,42 @@
-FROM golang:1.10.1-alpine3.7 as builder
+FROM golang:1.13.1-alpine3.10 as builder

 RUN apk add --no-cache make git
-WORKDIR /go/src/github.com/roboll/helmfile/
-COPY . /go/src/github.com/roboll/helmfile/
+WORKDIR /workspace/helmfile
+COPY . /workspace/helmfile
 RUN make static-linux

 # -----------------------------------------------------------------------------

-FROM alpine:3.7
+FROM alpine:3.10

-RUN apk add --no-cache ca-certificates git bash curl
+RUN apk add --no-cache ca-certificates git bash curl jq

-ARG HELM_VERSION=v2.9.1
+ARG HELM_VERSION=v2.13.0
 ARG HELM_LOCATION="https://kubernetes-helm.storage.googleapis.com"
 ARG HELM_FILENAME="helm-${HELM_VERSION}-linux-amd64.tar.gz"
-ARG HELM_SHA256="56ae2d5d08c68d6e7400d462d6ed10c929effac929fedce18d2636a9b4e166ba"
+ARG HELM_SHA256="15eca6ad225a8279de80c7ced42305e24bc5ac60bb7d96f2d2fa4af86e02c794"
 RUN wget ${HELM_LOCATION}/${HELM_FILENAME} && \
    sha256sum ${HELM_FILENAME} | grep -q "${HELM_SHA256}" && \
    tar zxf ${HELM_FILENAME} && mv /linux-amd64/helm /usr/local/bin/ && \
    rm ${HELM_FILENAME} && rm -r /linux-amd64

+# using the install documentation found at https://kubernetes.io/docs/tasks/tools/install-kubectl/
+# for now but in a future version of alpine (in the testing version at the time of writing)
+# we should be able to install using apk add.
+ENV KUBECTL_VERSION="v1.14.5"
+ENV KUBECTL_SHA256="26681319de56820a8467c9407e9203d5b15fb010ffc75ac5b99c9945ad0bd28c"
+RUN curl -LO "https://storage.googleapis.com/kubernetes-release/release/${KUBECTL_VERSION}/bin/linux/amd64/kubectl" && \
+    sha256sum kubectl | grep ${KUBECTL_SHA256} && \
+    chmod +x kubectl && \
+    mv kubectl /usr/local/bin/kubectl
+
 RUN mkdir -p "$(helm home)/plugins"
 RUN helm plugin install https://github.com/databus23/helm-diff && \
-    helm plugin install https://github.com/futuresimple/helm-secrets
+    helm plugin install https://github.com/futuresimple/helm-secrets && \
+    helm plugin install https://github.com/hypnoglow/helm-s3.git && \
+    helm plugin install https://github.com/aslafy-z/helm-git.git && \
+    helm plugin install https://github.com/rimusz/helm-tiller

-COPY --from=builder /go/src/github.com/roboll/helmfile/dist/helmfile_linux_amd64 /usr/local/bin/helmfile
+COPY --from=builder /workspace/helmfile/dist/helmfile_linux_amd64 /usr/local/bin/helmfile

 CMD ["/usr/local/bin/helmfile"]
@@ -1,90 +0,0 @@
-# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
-
-
-[[projects]]
-  name = "github.com/Masterminds/semver"
-  packages = ["."]
-  revision = "8d82589cda2d7b5b9167396841975c4535c9bec6"
-  version = "v1.4.1"
-
-[[projects]]
-  name = "github.com/Masterminds/sprig"
-  packages = ["."]
-  revision = "6b2a58267f6a8b1dc8e2eb5519b984008fa85e8c"
-  version = "v2.15.0"
-
-[[projects]]
-  name = "github.com/aokoli/goutils"
-  packages = ["."]
-  revision = "3391d3790d23d03408670993e957e8f408993c34"
-  version = "v1.0.1"
-
-[[projects]]
-  name = "github.com/google/uuid"
-  packages = ["."]
-  revision = "064e2069ce9c359c118179501254f67d7d37ba24"
-  version = "0.2"
-
-[[projects]]
-  name = "github.com/huandu/xstrings"
-  packages = ["."]
-  revision = "2bf18b218c51864a87384c06996e40ff9dcff8e1"
-  version = "v1.0.0"
-
-[[projects]]
-  name = "github.com/imdario/mergo"
-  packages = ["."]
-  revision = "9d5f1277e9a8ed20c3684bda8fde67c05628518c"
-  version = "v0.3.4"
-
-[[projects]]
-  name = "github.com/urfave/cli"
-  packages = ["."]
-  revision = "6011f165dc288c72abd8acd7722f837c5c64198d"
-
-[[projects]]
-  name = "go.uber.org/atomic"
-  packages = ["."]
-  revision = "1ea20fb1cbb1cc08cbd0d913a96dead89aa18289"
-  version = "v1.3.2"
-
-[[projects]]
-  name = "go.uber.org/multierr"
-  packages = ["."]
-  revision = "3c4937480c32f4c13a875a1829af76c98ca3d40a"
-  version = "v1.1.0"
-
-[[projects]]
-  name = "go.uber.org/zap"
-  packages = [
-    ".",
-    "buffer",
-    "internal/bufferpool",
-    "internal/color",
-    "internal/exit",
-    "zapcore"
-  ]
-  revision = "eeedf312bc6c57391d84767a4cd413f02a917974"
-  version = "v1.8.0"
-
-[[projects]]
-  branch = "master"
-  name = "golang.org/x/crypto"
-  packages = [
-    "pbkdf2",
-    "scrypt"
-  ]
-  revision = "b2aa35443fbc700ab74c586ae79b81c171851023"
-
-[[projects]]
-  name = "gopkg.in/yaml.v2"
-  packages = ["."]
-  revision = "5420a8b6744d3b0345ab293f6fcba19c978f1183"
-  version = "v2.2.1"
-
-[solve-meta]
-  analyzer-name = "dep"
-  analyzer-version = 1
-  inputs-digest = "57e868f6ae57c81a07ee682742f3b71bf5c7956311a3bb8ea76459677fc104c7"
-  solver-name = "gps-cdcl"
-  solver-version = 1
@@ -1,11 +0,0 @@
-[[constraint]]
-  name = "github.com/Masterminds/sprig"
-  version = "2.15.0"
-
-[[constraint]]
-  branch = "v2"
-  name = "gopkg.in/yaml.v2"
-
-[prune]
-  go-tests = true
-  unused-packages = true
@@ -26,19 +26,24 @@ integration:
 .PHONY: integration

 cross:
-	env CGO_ENABLED=0 gox -os '!freebsd !netbsd' -arch '!arm' -output "dist/{{.Dir}}_{{.OS}}_{{.Arch}}" -ldflags '-X main.Version=${TAG}' ${TARGETS}
+	env CGO_ENABLED=0 gox -os '!openbsd !freebsd !netbsd' -arch '!arm !mips !mipsle !mips64 !mips64le !s390x' -output "dist/{{.Dir}}_{{.OS}}_{{.Arch}}" -ldflags '-X main.Version=${TAG}' ${TARGETS}
 .PHONY: cross

 static-linux:
-	env CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o "dist/helmfile_linux_amd64" -ldflags '-X main.Version=${TAG}' ${TARGETS}
-.PHONY: linux
+	env CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GOFLAGS=-mod=vendor go build -o "dist/helmfile_linux_amd64" -ldflags '-X main.Version=${TAG}' ${TARGETS}
+.PHONY: static-linux
+
+install:
+	env CGO_ENABLED=0 go install -ldflags '-X main.Version=${TAG}' ${TARGETS}
+.PHONY: install

 clean:
 	rm dist/helmfile_*
 .PHONY: clean

 pristine: generate fmt
-	git ls-files --exclude-standard --modified --deleted --others | diff /dev/null -
+	git diff | cat
+	git ls-files --exclude-standard --modified --deleted --others -x vendor  | grep -v '^go.' | diff /dev/null -
 .PHONY: pristine

 release: pristine cross
@@ -61,3 +66,19 @@ tools:
 TAG  = $(shell git describe --tags --abbrev=0 HEAD)
 LAST = $(shell git describe --tags --abbrev=0 HEAD^)
 BODY = "`git log ${LAST}..HEAD --oneline --decorate` `printf '\n\#\#\# [Build Info](${BUILD_URL})'`"
+
+release/minor:
+	git checkout master
+	git pull --rebase origin master
+	bash -c 'if git branch | grep autorelease; then git branch -D autorelease; else echo no branch to be cleaned; fi'
+	git checkout -b autorelease origin/master
+	bash -c 'SEMTAG_REMOTE=origin hack/semtag final -s minor'
+	git checkout master
+
+release/patch:
+	git checkout master
+	git pull --rebase origin master
+	bash -c 'if git branch | grep autorelease; then git branch -D autorelease; else echo no branch to be cleaned; fi'
+	git checkout -b autorelease origin/master
+	bash -c 'SEMTAG_REMOTE=origin hack/semtag final -s patch'
+	git checkout master
@@ -1,18 +1,19 @@
-# helmfile [![CircleCI](https://circleci.com/gh/roboll/helmfile.svg?style=svg)](https://circleci.com/gh/roboll/helmfile)
+# Helmfile [![CircleCI](https://circleci.com/gh/roboll/helmfile.svg?style=svg)](https://circleci.com/gh/roboll/helmfile)

 Deploy Kubernetes Helm Charts

 [![Docker Repository on Quay](https://quay.io/repository/roboll/helmfile/status "Docker Repository on Quay")](https://quay.io/repository/roboll/helmfile)
+[![Slack Community #helmfile](https://slack.sweetops.com/badge.svg)](https://slack.sweetops.com)

-## status
+## Status

 Even though Helmfile is used in production environments [across multiple organizations](USERS.md), it is still in its early stage of development, hence versioned 0.x.

 Helmfile complies to Semantic Versioning 2.0.0 in which v0.x means that there could be backward-incompatible changes for every release.

-Note that we will try our best to document any backward incompatibility.
+Note that we will try our best to document any backward incompatibility. And in reality, helmfile had no breaking change for a year or so.

-## about
+## About

 Helmfile is a declarative spec for deploying helm charts. It lets you...

@@ -22,27 +23,57 @@ Helmfile is a declarative spec for deploying helm charts. It lets you...

 To avoid upgrades for each iteration of `helm`, the `helmfile` executable delegates to `helm` - as a result, `helm` must be installed.

-## configuration syntax
+## Highlights

-**CAUTION**: This documentation is for the development version of helmfile. If you are looking for the documentation for any of releases, please switch to the corresponding branch like [v0.12.0](https://github.com/roboll/helmfile/tree/v0.12.0).
+**Declarative**: Write, version-control, apply the desired state file for visibility and reproducibility.
+
+**Modules**: Modularize common patterns of your infrastructure, distribute it via Git, S3, etc. to be reused across the entire company (See [#648](https://github.com/roboll/helmfile/pull/648))
+
+**Versatility**: Manage your cluster consisting of charts, [kustomizations](https://github.com/kubernetes-sigs/kustomize), and directories of Kubernetes resources, turning everything to Helm releases (See [#673](https://github.com/roboll/helmfile/pull/673))
+
+**Patch**: JSON/Strategic-Merge Patch Kubernetes resources before `helm-install`ing, without forking upstream charts (See [#673](https://github.com/roboll/helmfile/pull/673))
+
+## Configuration
+
+**CAUTION**: This documentation is for the development version of Helmfile. If you are looking for the documentation for any of releases, please switch to the corresponding release tag like [v0.79.1](https://github.com/roboll/helmfile/tree/v0.79.1).

 The default helmfile is `helmfile.yaml`:

 ```yaml
+# Chart repositories used from within this state file
+#
+# Use `helm-s3` and `helm-git` and whatever Helm Downloader plugins
+# to use repositories other than the official repository or one backend by chartmuseum.
 repositories:
-  - name: roboll
-    url: http://roboll.io/charts
-    certFile: optional_client_cert
-    keyFile: optional_client_key
-    username: optional_username
-    password: optional_password
+# To use official "stable" charts a.k.a https://github.com/helm/charts/tree/master/stable
+- name: stable
+  url: https://kubernetes-charts.storage.googleapis.com
+# To use official "incubator" charts a.k.a https://github.com/helm/charts/tree/master/incubator
+- name: incubator
+  url: https://kubernetes-charts-incubator.storage.googleapis.com
+# helm-git powered repository: You can treat any Git repository as a charts repository
+- name: polaris
+  url: git+https://github.com/reactiveops/polaris@deploy/helm?ref=master
+# Advanced configuration: You can setup basic or tls auth
+- name: roboll
+  url: http://roboll.io/charts
+  certFile: optional_client_cert
+  keyFile: optional_client_key
+  username: optional_username
+  password: optional_password
+# Advanced configuration: You can use a ca bundle to use an https repo
+# with a self-signed certificate
+- name: insecure
+   url: https://charts.my-insecure-domain.com
+   caFile: optional_ca_crt

-context: kube-context					 # kube-context (--kube-context)
+# context: kube-context # this directive is deprecated, please consider using helmDefaults.kubeContext

-#default values to set for args along with dedicated keys that can be set by contributers, cli args take precedence overe these
-helmDefaults:           
+#default values to set for args along with dedicated keys that can be set by contributers, cli args take precedence over these
+helmDefaults:
  tillerNamespace: tiller-namespace  #dedicated default key for tiller-namespace
-  kubeContext: kube-context          #dedicated default key for kube-context
+  tillerless: false                  #dedicated default key for tillerless
+  kubeContext: kube-context          #dedicated default key for kube-context (--kube-context)
  # additional and global args passed to helm
  args:
    - "--set k=v"
@@ -52,7 +83,18 @@ helmDefaults:
  timeout: 600
  recreatePods: true
  force: true
+  # enable TLS for request to Tiller
+  tls: true
+  # path to TLS CA certificate file (default "$HELM_HOME/ca.pem")
+  tlsCACert: "path/to/ca.pem"
+  # path to TLS certificate file (default "$HELM_HOME/cert.pem")
+  tlsCert: "path/to/cert.pem"
+  # path to TLS key file (default "$HELM_HOME/key.pem")
+  tlsKey: "path/to/key.pem"

+# The desired states of Helm releases.
+#
+# Helmfile runs various helm commands to converge the current state in the live cluster to the desired state defined here.
 releases:
  # Published chart example
  - name: vault                            # name of this release
@@ -61,11 +103,21 @@ releases:
      foo: bar
    chart: roboll/vault-secret-manager     # the chart being installed to create this release, referenced by `repository/chart` syntax
    version: ~1.24.1                       # the semver of the chart. range constraint is supported
+    missingFileHandler: Warn # set to either "Error" or "Warn". "Error" instructs helmfile to fail when unable to find a values or secrets file. When "Warn", it prints the file and continues.
+    # Values files used for rendering the chart
    values:
-      # value files passed via --values
+      # Value files passed via --values
      - vault.yaml
-      # inline values, passed via a temporary values file and --values
+      # Inline values, passed via a temporary values file and --values, so that it doesn't suffer from type issues like --set
      - address: https://vault.example.com
+      # Go template available in inline values and values files.
+      - image:
+          # The end result is more or less YAML. So do `quote` to prevent number-like strings from accidentally parsed into numbers!
+          # See https://github.com/roboll/helmfile/issues/608
+          tag: {{ requiredEnv "IMAGE_TAG" | quote }}
+          # Otherwise:
+          #   tag: "{{ requiredEnv "IMAGE_TAG" }}"
+          #   tag: !!string {{ requiredEnv "IMAGE_TAG" }}
        db:
          username: {{ requiredEnv "DB_USERNAME" }}
          # value taken from environment variable. Quotes are necessary. Will throw an error if the environment variable is not set. $DB_PASSWORD needs to be set in the calling environment ex: export DB_PASSWORD='password1'
@@ -74,6 +126,8 @@ releases:
          # Interpolate environment variable with a fixed string
          domain: {{ requiredEnv "PLATFORM_ID" }}.my-domain.com
          scheme: {{ env "SCHEME" | default "https" }}
+    # Use `values` whenever possible!
+    # `set` translates to helm's `--set key=val`, that is known to suffer from type issues like https://github.com/roboll/helmfile/issues/608
    set:
    # single value loaded from a local file, translates to --set-file foo.config=path/to/file
    - name: foo.config
@@ -83,9 +137,14 @@ releases:
      values:
      - 1
      - 2
+    # set a templated value
+    - name: namespace
+      value: {{ .Namespace }}
    # will attempt to decrypt it using helm-secrets plugin
    secrets:
      - vault_secret.yaml
+    # verify the chart before upgrading (only works with packaged charts not directories)
+    verify: true
    # wait for k8s resources via --wait. Defaults to `false`
    wait: true
    # time in seconds to wait for any individual Kubernetes operation (like Jobs for hooks, and waits on pod/pvc/svc/deployment readiness) (default 300)
@@ -94,16 +153,112 @@ releases:
    recreatePods: true
    # forces resource update through delete/recreate if needed
    force: true
+    # set `false` to uninstall on sync
+    installed: true
+    # restores previous state in case of failed release
+    atomic: true
+    # name of the tiller namespace
+    tillerNamespace: vault
+    # if true, will use the helm-tiller plugin
+    tillerless: false
+    # enable TLS for request to Tiller
+    tls: true
+    # path to TLS CA certificate file (default "$HELM_HOME/ca.pem")
+    tlsCACert: "path/to/ca.pem"
+    # path to TLS certificate file (default "$HELM_HOME/cert.pem")
+    tlsCert: "path/to/cert.pem"
+    # path to TLS key file (default "$HELM_HOME/key.pem")
+    tlsKey: "path/to/key.pem"
+    # --kube-context to be passed to helm commands
+    # CAUTION: this doesn't work as expected for `tilerless: true`.
+    # See https://github.com/roboll/helmfile/issues/642
+    kubeContext: kube-context

  # Local chart example
  - name: grafana                            # name of this release
    namespace: another                       # target namespace
-    chart: ../my-charts/grafana              # the chart being installed to create this release, referenced by relative path to local chart
+    chart: ../my-charts/grafana              # the chart being installed to create this release, referenced by relative path to local helmfile
    values:
    - "../../my-values/grafana/values.yaml"             # Values file (relative path to manifest)
    - ./values/{{ requiredEnv "PLATFORM_ENV" }}/config.yaml # Values file taken from path with environment variable. $PLATFORM_ENV must be set in the calling environment.
    wait: true

+#
+# Advanced Configuration: Nested States
+#
+helmfiles:
+- # Path to the helmfile state file being processed BEFORE releases in this state file
+  path: path/to/subhelmfile.yaml
+  # Label selector used for filtering releases in the nested state.
+  # For example, `name=prometheus` in this context is equivalent to processing the nested state like
+  #   helmfile -f path/to/subhelmfile.yaml -l name=prometheus sync
+  selectors:
+  - name=prometheus
+  # Override state values
+  values:
+  # Values files merged into the nested state's values
+  - additional.values.yaml
+  # One important aspect of using values here is that they first need to be defined in the values section
+  # of the origin helmfile, so in this example key1 needs to be in the values or environments.NAME.values of path/to/subhelmfile.yaml
+  # Inline state values merged into the nested state's values
+  - key1: val1
+- # All the nested state files under `helmfiles:` is processed in the order of definition.
+  # So it can be used for preparation for your main `releases`. An example would be creating CRDs required by `releases` in the parent state file.
+  path: path/to/mycrd.helmfile.yaml
+- # Terraform-module-like URL for importing a remote directory and use a file in it as a nested-state file
+  # The nested-state file is locally checked-out along with the remote directory containing it.
+  # Therefore all the local paths in the file are resolved relative to the file
+  path: git::https://github.com/cloudposse/helmfiles.git@releases/kiam.yaml?ref=0.40.0
+
+#
+# Advanced Configuration: Environments
+#
+
+# The list of environments managed by helmfile.
+#
+# The default is `environments: {"default": {}}` which implies:
+#
+# - `{{ .Environment.Name }}` evaluates to "default"
+# - `{{ .Values }}` being empty
+environments:
+  # The "default" environment is available and used when `helmfile` is run without `--environment NAME`.
+  default:
+    # Everything from the values.yaml is available via `{{ .Values.KEY }}`.
+    # Suppose `{"foo": {"bar": 1}}` contained in the values.yaml below,
+    # `{{ .Values.foo.bar }}` is evaluated to `1`.
+    values:
+    - environments/default/values.yaml
+    # Each entry in values can be either a file path or inline values.
+    # The below is an example of inline values, which is merged to the `.Values`
+    - myChartVer: 1.0.0-dev
+  # Any environment other than `default` is used only when `helmfile` is run with `--environment NAME`.
+  # That is, the "production" env below is used when and only when it is run like `helmfile --environment production sync`.
+  production:
+    values:
+    - environment/production/values.yaml
+    - myChartVer: 1.0.0
+    ## `secrets.yaml` is decrypted by `helm-secrets` and available via `{{ .Environment.Secrets.KEY }}`
+    secrets:
+    - environment/production/secrets.yaml
+    # Instructs helmfile to fail when unable to find a environment values file listed under `environments.NAME.values`.
+    #
+    # Possible values are  "Error", "Warn", "Info", "Debug". The default is "Error".
+    #
+    # Use "Warn", "Info", or "Debug" if you want helmfile to not fail when a values file is missing, while just leaving
+    # a message about the missing file at the log-level.
+    missingFileHandler: Error
+
+#
+# Advanced Configuration: Layering
+#
+# Helmfile merges all the "base" state files and this state file before processing.
+#
+# Assuming this state file is named `helmfile.yaml`, all the files are merged in the order of:
+#   environments.yaml <- defaults.yaml <- templates.yaml <- helmfile.yaml
+bases:
+- environments.yaml
+- defaults.yaml
+- templates.yaml
 ```

 ## Templating
@@ -121,7 +276,7 @@ Environment variables can be used in most places for templating the helmfile. Cu
 Examples:

 ```yaml
-respositories:
+repositories:
 - name: your-private-git-repo-hosted-charts
  url: https://{{ requiredEnv "GITHUB_TOKEN"}}@raw.githubusercontent.com/kmzfs/helm-repo-in-github/master/
 ```
@@ -144,9 +299,11 @@ releases:

 ## installation

- `go get github.com/roboll/helmfile` or
 - download one of [releases](https://github.com/roboll/helmfile/releases) or
- run as a [container](https://quay.io/roboll/helmfile)
+- run as a [container](https://quay.io/roboll/helmfile) or
+- install from [AUR](https://aur.archlinux.org/packages/kubernetes-helmfile-bin/) for Archlinux or
+- Windows (using [scoop](https://scoop.sh/)): `scoop install helmfile`
+- macOS (using [homebrew](https://brew.sh/)): `brew install helmfile`

 ## getting started

@@ -167,12 +324,16 @@ releases:
 Sync your Kubernetes cluster state to the desired one by running:

 ```console
-helmfile sync
+helmfile apply
 ```

 Congratulations! You now have your first Prometheus deployment running inside your cluster.

-Iterate on the `helmfile.yaml` by referencing the [configuration syntax](#configuration-syntax) and the [cli reference](#cli-reference).
+Iterate on the `helmfile.yaml` by referencing:
+
+- [Configuration syntax](#configuration-syntax)
+- [CLI reference](#cli-reference).
+- [Helmfile Best Practices Guide](https://github.com/roboll/helmfile/blob/master/docs/writing-helmfile.md)

 ## cli reference

@@ -183,38 +344,66 @@ NAME:
 USAGE:
   helmfile [global options] command [command options] [arguments...]

+VERSION:
+   v0.70.0
+
 COMMANDS:
-     repos   sync repositories from state file (helm repo add && helm repo update)
-     charts  sync charts from state file (helm upgrade --install)
-     diff    diff charts from state file against env (helm diff)
-     lint    lint charts from state file (helm lint)
-     sync    sync all resources from state file (repos, charts and local chart deps)
-     status  retrieve status of releases in state file
-     delete  delete charts from state file (helm delete)
-     test    tets releases from state file (helm test)
+     deps      update charts based on the contents of requirements.yaml
+     repos     sync repositories from state file (helm repo add && helm repo update)
+     charts    DEPRECATED: sync releases from state file (helm upgrade --install)
+     diff      diff releases from state file against env (helm diff)
+     template  template releases from state file against env (helm template)
+     lint      lint charts from state file (helm lint)
+     sync      sync all resources from state file (repos, releases and chart deps)
+     apply     apply all resources from state file only when there are changes
+     status    retrieve status of releases in state file
+     delete    DEPRECATED: delete releases from state file (helm delete)
+     destroy   deletes and then purges releases
+     test      test releases from state file (helm test)

 GLOBAL OPTIONS:
-   --file FILE, -f FILE         load config from FILE (default: "helmfile.yaml")
-   --quiet, -q                  silence output
-   --namespace value, -n value  Set namespace. Uses the namespace set in the context by default
-   --selector,l value           Only run using the releases that match labels. Labels can take the form of foo=bar or foo!=bar.
-	                              A release must match all labels in a group in order to be used. Multiple groups can be specified at once.
-	                              --selector tier=frontend,tier!=proxy --selector tier=backend. Will match all frontend, non-proxy releases AND all backend releases.
-	                              The name of a release can be used as a label. --selector name=myrelease
-   --kube-context value         Set kubectl context. Uses current context by default
-   --help, -h                   show help
-   --version, -v                print the version
+   --helm-binary value, -b value           path to helm binary
+   --file helmfile.yaml, -f helmfile.yaml  load config from file or directory. defaults to helmfile.yaml or `helmfile.d`(means `helmfile.d/*.yaml`) in this preference
+   --environment default, -e default       specify the environment name. defaults to default
+   --state-values-set value                set state values on the command line (can specify multiple or separate values with commas: key1=val1,key2=val2)
+   --state-values-file value               specify state values in a YAML file
+   --quiet, -q                             Silence output. Equivalent to log-level warn
+   --kube-context value                    Set kubectl context. Uses current context by default
+   --log-level value                       Set log level, default info
+   --namespace value, -n value             Set namespace. Uses the namespace set in the context by default, and is available in templates as {{ .Namespace }}
+   --selector value, -l value              Only run using the releases that match labels. Labels can take the form of foo=bar or foo!=bar.
+                                           A release must match all labels in a group in order to be used. Multiple groups can be specified at once.
+                                           --selector tier=frontend,tier!=proxy --selector tier=backend. Will match all frontend, non-proxy releases AND all backend releases.
+                                           The name of a release can be used as a label. --selector name=myrelease
+   --allow-no-matching-release             Do not exit with an error code if the provided selector has no matching releases.
+   --interactive, -i                       Request confirmation before attempting to modify clusters
+   --help, -h                              show help
+   --version, -v                           print the version
 ```

 ### sync

-The `helmfile sync` sub-command sync your cluster state as described in your `helmfile`. The default helmfile is `helmfile.yaml`, but any yaml file can be passed by specifying a `--file path/to/your/yaml/file` flag.
+The `helmfile sync` sub-command sync your cluster state as described in your `helmfile`. The default helmfile is `helmfile.yaml`, but any YAML file can be passed by specifying a `--file path/to/your/yaml/file` flag.

 Under the covers, Helmfile executes `helm upgrade --install` for each `release` declared in the manifest, by optionally decrypting [secrets](#secrets) to be consumed as helm chart values. It also updates specified chart repositories and updates the
 dependencies of any referenced local charts.

 For Helm 2.9+ you can use a username and password to authenticate to a remote repository.

+### deps
+
+The `helmfile deps` sub-command locks your helmfile state and local charts dependencies.
+
+It basically runs `helm dependency update` on your helmfile state file and all the referenced local charts, so that you get a "lock" file per each helmfile state or local chart.
+
+All the other `helmfile` sub-commands like `sync` use chart versions recorded in the lock files, so that e.g. untested chart versions won't suddenly get deployed to the production environment.
+
+For example, the lock file for a helmfile state file named `helmfile.1.yaml` will be `helmfile.1.lock`. The lock file for a local chart would be `requirements.lock`, which is the same as `helm`.
+
+It is recommended to version-control all the lock files, so that they can be used in the production deployment pipeline for extra reproducibility.
+
+To bring in chart updates systematically, it would also be a good idea to run `helmfile deps` regularly, test it, and then update the lock files in the version-control system.
+
 ### diff

 The `helmfile diff` sub-command executes the [helm-diff](https://github.com/databus23/helm-diff) plugin across all of
@@ -224,12 +413,29 @@ To supply the diff functionality Helmfile needs the [helm-diff](https://github.c
 you should be able to simply execute `helm plugin install https://github.com/databus23/helm-diff`. For more details
 please look at their [documentation](https://github.com/databus23/helm-diff#helm-diff-plugin).

-### delete
+### apply

-The `helmfile delete` sub-command deletes all the releases defined in the manfiests
+The `helmfile apply` sub-command begins by executing `diff`. If `diff` finds that there is any changes, `sync` is executed. Adding `--interactive` instructs Helmfile to request your confirmation before `sync`.
+
+An expected use-case of `apply` is to schedule it to run periodically, so that you can auto-fix skews between the desired and the current state of your apps running on Kubernetes clusters.
+
+### destroy
+
+The `helmfile destroy` sub-command deletes and purges all the releases defined in the manifests.
+
+`helmfile --interactive destroy` instructs Helmfile to request your confirmation before actually deleting releases.
+
+`destroy` basically runs `helm delete --purge` on all the targeted releases. If you don't want purging, use `helmfile delete` instead.
+
+### delete (DEPRECATED)
+
+The `helmfile delete` sub-command deletes all the releases defined in the manifests.
+
+`helmfile --interactive delete` instructs Helmfile to request your confirmation before actually deleting releases.

 Note that `delete` doesn't purge releases. So `helmfile delete && helmfile sync` results in sync failed due to that releases names are not deleted but preserved for future references. If you really want to remove releases for reuse, add `--purge` flag to run it like `helmfile delete --purge`.

+
 ### secrets

 The `secrets` parameter in a `helmfile.yaml` causes the [helm-secrets](https://github.com/futuresimple/helm-secrets) plugin to be executed to decrypt the file.
@@ -254,13 +460,13 @@ Using manifest files in conjunction with command line argument can be a bit conf
 A few rules to clear up this ambiguity:

 - Absolute paths are always resolved as absolute paths
- Relative paths referenced *in* the helmfile manifest itself are relative to that manifest
+- Relative paths referenced *in* the Helmfile manifest itself are relative to that manifest
 - Relative paths referenced on the command line are relative to the current working directory the user is in

 For additional context, take a look at [paths examples](PATHS.md)

 ## Labels Overview
-A selector can be used to only target a subset of releases when running helmfile. This is useful for large helmfiles with releases that are logically grouped together.
+A selector can be used to only target a subset of releases when running Helmfile. This is useful for large helmfiles with releases that are logically grouped together.

 Labels are simple key value pairs that are an optional field of the release spec. When selecting by label, the search can be inverted. `tier!=backend` would match all releases that do NOT have the `tier: backend` label. `tier=fronted` would only match releases with the `tier: frontend` label.

@@ -270,9 +476,496 @@ The `selector` parameter can be specified multiple times. Each parameter is reso

 `--selector tier=frontend --selector tier=backend` will select all the charts

+In addition to user supplied labels, the name, the namespace, and the chart are available to be used as selectors.  The chart will just be the chart name excluding the repository (Example `stable/filebeat` would be selected using `--selector chart=filebeat`).
+
+## Templates
+
+You can use go's text/template expressions in `helmfile.yaml` and `values.yaml.gotmpl` (templated helm values files). `values.yaml` references will be used verbatim. In other words:
+
+- for value files ending with `.gotmpl`, template expressions will be rendered
+- for plain value files (ending in `.yaml`), content will be used as-is
+
+In addition to built-in ones, the following custom template functions are available:
+
+- `readFile` reads the specified local file and generate a golang string
+- `fromYaml` reads a golang string and generates a map
+- `setValueAtPath PATH NEW_VALUE` traverses a golang map, replaces the value at the PATH with NEW_VALUE
+- `toYaml` marshals a map into a string
+
+### Values Files Templates
+
+You can reference a template of values file in your `helmfile.yaml` like below:
+
+```yaml
+releases
+- name: myapp
+  chart: mychart
+  values:
+  - values.yaml.gotmpl
+```
+
+Every values file whose file extension is `.gotmpl` is considered as a template file.
+
+Suppose `values.yaml.gotmpl` was something like:
+
+```yaml
+{{ readFile "values.yaml" | fromYaml | setValueAtPath "foo.bar" "FOO_BAR" | toYaml }}
+```
+
+And `values.yaml` was:
+
+```yaml
+foo:
+  bar: ""
+```
+
+The resulting, temporary values.yaml that is generated from `values.yaml.tpl` would become:
+
+```yaml
+foo:
+  # Notice `setValueAtPath "foo.bar" "FOO_BAR"` in the template above
+  bar: FOO_BAR
+```
+
+## Refactoring `helmfile.yaml` with values files templates
+
+One of expected use-cases of values files templates is to keep `helmfile.yaml` small and concise.
+
+See the example `helmfile.yaml` below:
+
+```yaml
+releases:
+  - name: {{ requiredEnv "NAME" }}-vault
+    namespace: {{ requiredEnv "NAME" }}
+    chart: roboll/vault-secret-manager
+    values:
+      - db:
+          username: {{ requiredEnv "DB_USERNAME" }}
+          password: {{ requiredEnv "DB_PASSWORD" }}
+    set:
+      - name: proxy.domain
+        value: {{ requiredEnv "PLATFORM_ID" }}.my-domain.com
+      - name: proxy.scheme
+        value: {{ env "SCHEME" | default "https" }}
+```
+
+The `values` and `set` sections of the config file can be separated out into a template:
+
+`helmfile.yaml`:
+
+```yaml
+releases:
+  - name: {{ requiredEnv "NAME" }}-vault
+    namespace: {{ requiredEnv "NAME" }}
+    chart: roboll/vault-secret-manager
+    values:
+    - values.yaml.gotmpl
+```
+
+`values.yaml.gotmpl`:
+
+```yaml
+db:
+  username: {{ requiredEnv "DB_USERNAME" }}
+  password: {{ requiredEnv "DB_PASSWORD" }}
+proxy:
+  domain: {{ requiredEnv "PLATFORM_ID" }}.my-domain.com
+  scheme: {{ env "SCHEME" | default "https" }}
+```
+
+## Environment
+
+When you want to customize the contents of `helmfile.yaml` or `values.yaml` files per environment, use this feature.
+
+You can define as many environments as you want under `environments` in `helmfile.yaml`.
+
+The environment name defaults to `default`, that is, `helmfile sync` implies the `default` environment.
+The selected environment name can be referenced from `helmfile.yaml` and `values.yaml.gotmpl` by `{{ .Environment.Name }}`.
+
+If you want to specify a non-default environment, provide a `--environment NAME` flag to `helmfile` like `helmfile --environment production sync`.
+
+The below example shows how to define a production-only release:
+
+```yaml
+environments:
+  default:
+  production:
+
+releases:
+
+{{ if eq .Environment.Name "production" }}
+- name: newrelic-agent
+  # snip
+{{ end }}
+- name: myapp
+  # snip
+```
+
+## Environment Values
+
+Environment Values allows you to inject a set of values specific to the selected environment, into values.yaml templates.
+Use it to inject common values from the environment to multiple values files, to make your configuration DRY.
+
+Suppose you have three files `helmfile.yaml`, `production.yaml` and `values.yaml.gotmpl`:
+
+`helmfile.yaml`
+
+```yaml
+environments:
+  production:
+    values:
+    - production.yaml
+
+releases:
+- name: myapp
+  values:
+  - values.yaml.gotmpl
+```
+
+`production.yaml`
+
+```yaml
+domain: prod.example.com
+releaseName: prod
+```
+
+`values.yaml.gotmpl`
+
+```yaml
+domain: {{ .Values | getOrNil "my.domain" | default "dev.example.com" }}
+```
+
+`helmfile sync` installs `myapp` with the value `domain=dev.example.com`,
+whereas `helmfile --environment production sync` installs the app with the value `domain=production.example.com`.
+
+For even more flexibility, you can now use values declared in the `environments:` section in other parts of your helmfiles:
+
+consider:
+`default.yaml`
+
+```yaml
+domain: dev.example.com
+releaseName: dev
+```
+
+```yaml
+environments:
+  default:
+    values:
+    - default.yaml
+  production:
+    values:
+    - production.yaml #  bare .yaml file, content will be used verbatim
+    - other.yaml.gotmpl  #  template directives with potential side-effects like `exec` and `readFile` will be honoured
+
+releases:
+- name: myapp-{{ .Values.releaseName }} # release name will be one of `dev` or `prod` depending on selected environment
+  values:
+  - values.yaml.gotmpl
+
+{{ if eq (.Values.releaseName "prod" ) }}
+# this release would be installed only if selected environment is `production`
+- name: production-specific-release
+  ...
+{{ end }}
+```
+
+### Note
+
+The `{{ .Values.foo }}` syntax is the recommended way of using environment values.
+
+Prior to this [pull request](https://github.com/roboll/helmfile/pull/647), environment values were made available through the `{{ .Environment.Values.foo }}` syntax.
+This is still working but is **deprecated** and the new `{{ .Values.foo }}` syntax should be used instead.
+
+You can read more infos about the feature proposal [here](https://github.com/roboll/helmfile/issues/640).
+
+## Environment Secrets
+
+Environment Secrets (not to be confused with Kubernetes Secrets) are encrypted versions of `Environment Values`.
+You can list any number of `secrets.yaml` files created using `helm secrets` or `sops`, so that
+Helmfile could automatically decrypt and merge the secrets into the environment values.
+
+First you must have the [helm-secrets](https://github.com/futuresimple/helm-secrets) plugin installed along with a
+`.sops.yaml` file to configure the method of encryption (this can be in the same directory as your helmfile or
+in the sub-directory containing your secrets files).
+
+Then suppose you have a a foo.bar secret defined in `environments/production/secrets.yaml`:
+```yaml
+foo.bar: "mysupersecretstring"
+```
+
+You can then encrypt it with `helm secrets enc environments/production/secrets.yaml`
+
+Then reference that encrypted file in `helmfile.yaml`:
+```yaml
+environments:
+  production:
+    secrets:
+    - environments/production/secrets.yaml
+
+releases:
+- name: myapp
+  chart: mychart
+  values:
+  - values.yaml.gotmpl
+```
+
+Then the environment secret `foo.bar` can be referenced by the below template expression in your `values.yaml.gotmpl`:
+
+```yaml
+{{ .Values.foo.bar }}
+```
+
+## Tillerless
+
+With the [helm-tiller](https://github.com/rimusz/helm-tiller) plugin installed, you can work without tiller installed.
+
+To enable this mode, you need to define `tillerless: true` and set the `tillerNamespace` in the `helmDefaults` section
+or in the `releases` entries.
+
+## Separating helmfile.yaml into multiple independent files
+
+Once your `helmfile.yaml` got to contain too many releases,
+split it into multiple yaml files.
+
+Recommended granularity of helmfile.yaml files is "per microservice" or "per team".
+And there are two ways to organize your files.
+
+- Single directory
+- Glob patterns
+
+### Single directory
+
+`helmfile -f path/to/directory` loads and runs all the yaml files under the specified directory, each file as an independent helmfile.yaml.
+The default helmfile directory is `helmfile.d`, that is,
+in case helmfile is unable to locate `helmfile.yaml`, it tries to locate `helmfile.d/*.yaml`.
+
+All the yaml files under the specified directory are processed in the alphabetical order. For example, you can use a `<two digit number>-<microservice>.yaml` naming convention to control the sync order.
+
+- `helmfile.d`/
+  - `00-database.yaml`
+  - `00-backend.yaml`
+  - `01-frontend.yaml`
+
+### Glob patterns
+
+In case you want more control over how multiple `helmfile.yaml` files are organized, use `helmfiles:` configuration key in the `helmfile.yaml`:
+
+Suppose you have multiple microservices organized in a Git repository that looks like:
+
+- `myteam/` (sometimes it is equivalent to a k8s ns, that is `kube-system` for `clusterops` team)
+  - `apps/`
+    - `filebeat/`
+      - `helmfile.yaml` (no `charts/` exists, because it depends on the stable/filebeat chart hosted on the official helm charts repository)
+      - `README.md` (each app managed by my team has a dedicated README maintained by the owners of the app)
+    - `metricbeat/`
+      - `helmfile.yaml`
+      - `README.md`
+    - `elastalert-operator/`
+      - `helmfile.yaml`
+      - `README.md`
+      - `charts/`
+        - `elastalert-operator/`
+          - `<the content of the local helm chart>`
+
+The benefits of this structure is that you can run `git diff` to locate in which directory=microservice a git commit has changes.
+It allows your CI system to run a workflow for the changed microservice only.
+
+A downside of this is that you don't have an obvious way to sync all microservices at once. That is, you have to run:
+
+```bash
+for d in apps/*; do helmfile -f $d diff; if [ $? -eq 2 ]; then helmfile -f $d sync; fi; done
+```
+
+At this point, you'll start writing a `Makefile` under `myteam/` so that `make sync-all` will do the job.
+
+It does work, but you can rely on the Helmfile feature instead.
+
+Put `myteam/helmfile.yaml` that looks like:
+
+```yaml
+helmfiles:
+- apps/*/helmfile.yaml
+```
+
+So that you can get rid of the `Makefile` and the bash snippet.
+Just run `helmfile sync` inside `myteam/`, and you are done.
+
+All the files are sorted alphabetically per group = array item inside `helmfiles:`, so that you have granular control over ordering, too.
+
+#### selectors
+
+When composing helmfiles you can use selectors from the command line as well as explicit selectors inside the parent helmfile to filter the releases to be used.
+
+```yaml
+helmfiles:
+- apps/*/helmfile.yaml
+- path: apps/a-helmfile.yaml
+  selectors:          # list of selectors
+  - name=prometheus
+  - tier=frontend
+- path: apps/b-helmfile.yaml # no selector, so all releases are used
+selectors: []
+- path: apps/c-helmfile.yaml # parent selector to be used or cli selector for the initial helmfile
+  selectorsInherited: true
+```
+
+* When a selector is specified, only this selector applies and the parents or CLI selectors are ignored.
+* When not selector is specified there are 2 modes for the selector inheritance because we would like to change the current inheritance behavior (see [issue #344](https://github.com/roboll/helmfile/issues/344)  ).
+  * Legacy mode, sub-helmfiles without selectors inherit selectors from their parent helmfile. The initial helmfiles inherit from the command line selectors.
+  * explicit mode, sub-helmfile without selectors do not inherit from their parent or the CLI selector. If you want them to inherit from their parent selector then use `selectorsInherited: true`. To enable this explicit mode you need to set the following environment variable `HELMFILE_EXPERIMENTAL=explicit-selector-inheritance` (see [experimental](#experimental-features)).
+* Using `selector: []` will select all releases regardless of the parent selector or cli for the initial helmfile
+* using `selectorsInherited: true` make the sub-helmfile selects releases with the parent selector or the cli for the initial helmfile. You cannot specify an explicit selector while using `selectorsInherited: true`
+
+## Importing values from any source
+
+The `exec` template function that is available in `values.yaml.gotmpl` is useful for importing values from any source
+that is accessible by running a command:
+
+A usual usage of `exec` would look like this:
+
+```
+mysetting: |
+{{ exec "./mycmd" (list "arg1" "arg2" "--flag1") | indent 2 }}
+```
+
+Or even with a pipeline:
+
+```
+mysetting: |
+{{ yourinput | exec "./mycmd-consume-stdin" (list "arg1" "arg2") | indent 2 }}
+```
+
+The possibility is endless. Try importing values from your golang app, bash script, jsonnet, or anything!
+
+## Hooks
+
+A Helmfile hook is a per-release extension point that is composed of:
+
+- `events`
+- `command`
+- `args`
+- `showlogs`
+
+Helmfile triggers various `events` while it is running.
+Once `events` are triggered, associated `hooks` are executed, by running the `command` with `args`. The standard output of the `command` will be displayed if `showlogs` is set and it's value is `true`.
+
+Currently supported `events` are:
+
+- `prepare`
+- `presync`
+- `postsync`
+- `cleanup`
+
+Hooks associated to `prepare` events are triggered after each release in your helmfile is loaded from YAML, before execution.
+
+Hooks associated to `cleanup` events are triggered after each release is processed.
+
+Hooks associated to `presync` events are triggered before each release is applied to the remote cluster. This is the ideal event to execute any commands that may mutate the cluster state as it will not be run for read-only operations like `lint`, `diff` or `template`.
+
+Hooks associated to `postsync` events are triggered after each release is applied to the remote cluster. This is the ideal event to execute any commands that may mutate the cluster state as it will not be run for read-only operations like `lint`, `diff` or `template`.
+
+The following is an example hook that just prints the contextual information provided to hook:
+
+```
+releases:
+- name: myapp
+  chart: mychart
+  # *snip*
+  hooks:
+  - events: ["prepare", "cleanup"]
+    showlogs: true
+    command: "echo"
+    args: ["{{`{{.Environment.Name}}`}}", "{{`{{.Release.Name}}`}}", "{{`{{.HelmfileCommand}}`}}\
+"]
+```
+
+Let's say you ran `helmfile --environment prod sync`, the above hook results in executing:
+
+```
+echo {{Environment.Name}} {{.Release.Name}} {{.HelmfileCommand}}
+```
+
+Whereas the template expressions are executed thus the command becomes:
+
+```
+echo prod myapp sync
+```
+
+Now, replace `echo` with any command you like, and rewrite `args` that actually conforms to the command, so that you can integrate any command that does:
+
+- templating
+- linting
+- testing
+
+For templating, imagine that you created a hook that generates a helm chart on-the-fly by running an external tool like ksonnet, kustomize, or your own template engine.
+It will allow you to write your helm releases with any language you like, while still leveraging goodies provided by helm.
+
+### Helmfile + Kustomize
+
+Do you prefer `kustomize` to write and organize your Kubernetes apps, but still want to leverage helm's useful features
+like rollback, history, and so on? This section is for you!
+
+The combination of `hooks` and [helmify-kustomize](https://gist.github.com/mumoshu/f9d0bd98e0eb77f636f79fc2fb130690)
+enables you to integrate [kustomize](https://github.com/kubernetes-sigs/kustomize) into Helmfile.
+
+That is, you can use `kustommize` to build a local helm chart from a kustomize overlay.
+
+Let's assume you have a kustomize project named `foo-kustomize` like this:
+
+```
+foo-kustomize/
+├── base
+│   ├── configMap.yaml
+│   ├── deployment.yaml
+│   ├── kustomization.yaml
+│   └── service.yaml
+└── overlays
+    ├── default
+    │   ├── kustomization.yaml
+    │   └── map.yaml
+    ├── production
+    │   ├── deployment.yaml
+    │   └── kustomization.yaml
+    └── staging
+        ├── kustomization.yaml
+        └── map.yaml
+
+5 directories, 10 files
+```
+
+Write `helmfile.yaml`:
+
+```yaml
+- name: kustomize
+  chart: ./foo
+  hooks:
+  - events: ["prepare", "cleanup"]
+    command: "../helmify"
+    args: ["{{`{{if eq .Event.Name \"prepare\"}}build{{else}}clean{{end}}`}}", "{{`{{.Release.Ch\
+art}}`}}", "{{`{{.Environment.Name}}`}}"]
+```
+
+Run `helmfile --environment staging sync` and see it results in helmfile running `kustomize build foo-kustomize/overlays/staging > foo/templates/all.yaml`.
+
+Voilà! You can mix helm releases that are backed by remote charts, local charts, and even kustomize overlays.
+
+## Guides
+
+Use the [Helmfile Best Practices Guide](/docs/writing-helmfile.md) to write advanced helmfiles that feature:
+
+- Default values
+- Layering
+
+We also have dedicated documentation on the following topics which might interest you:
+
+- [Shared Configurations Across Teams](/docs/shared-configuration-across-teams.md)
+
+Or join our friendly slack community in the [`#helmfile`](https://slack.sweetops.com) channel to ask questions and get help. Check out our [slack archive](https://archive.sweetops.com/helmfile/) for good examples of how others are using it.
+
 ## Using env files

-helmfile itself doesn't have an ability to load env files. But you can write some bash script to achieve the goal:
+Helmfile itself doesn't have an ability to load env files. But you can write some bash script to achieve the goal:

 ```console
 set -a; . .env; set +a; helmfile sync
@@ -280,13 +973,49 @@ set -a; . .env; set +a; helmfile sync

 Please see #203 for more context.

-## Running helmfile without an Internet connection
+## Running helmfile interactively
+
+`helmfile --interactive [apply|destroy]` requests confirmation from you before actually modifying your cluster.
+
+Use it when you're running `helmfile` manually on your local machine or a kind of secure administrative hosts.
+
+For your local use-case, aliasing it like `alias hi='helmfile --interactive'` would be convenient.
+
+## Running Helmfile without an Internet connection

 Once you download all required charts into your machine, you can run `helmfile charts` to deploy your apps.
 It basically run only `helm upgrade --install` with your already-downloaded charts, hence no Internet connection is required.
 See #155 for more information on this topic.

+## Experimental features
+Some experimental features may be available for testing in perspective of being (or not) included in a future release.
+Those features are set using the environment variable `HELMFILE_EXPERIMENTAL`. Here is the current experimental feature :
+* `explicit-selector-inheritance` : remove today implicit cli selectors inheritance for composed helmfiles, see [composition selector](#selectors)
+
+If you want to enable all experimental features set the env var to `HELMFILE_EXPERIMENTAL=true`
+
+## Azure ACR integration
+
+Azure offers helm repository [support for Azure Container Registry](https://docs.microsoft.com/en-us/azure/container-registry/container-registry-helm-repos) as a preview feature.
+
+To use this you must first `az login` and then `az acr helm repo add -n <MyRegistry>`. This will extract a token for the given ACR and configure `helm` to use it, e.g. `helm repo update` should work straight away.
+
+To use `helmfile` with ACR, on the other hand, you must either include a username/password in the repository definition for the ACR in your `helmfile.yaml` or use the `--skip-deps` switch, e.g. `helmfile template --skip-deps`.
+
+An ACR repository definition in `helmfile.yaml` looks like this:
+
+```
+repositories:
+  - name: <MyRegistry>
+    url: https://<MyRegistry>.azurecr.io/helm/v1/repo
+```

 ## Examples

-For more examples, see the [examples/README.md](https://github.com/roboll/helmfile/blob/master/examples/README.md) or the [`helmfile.d`](https://github.com/cloudposse/helmfiles/tree/master/helmfile.d) distribution of helmfiles by [Cloud Posse](https://github.com/cloudposse/).
+For more examples, see the [examples/README.md](https://github.com/roboll/helmfile/blob/master/examples/README.md) or the [`helmfile`](https://github.com/cloudposse/helmfiles/tree/master/releases) distribution by [Cloud Posse](https://github.com/cloudposse/).
+
+# Attribution
+
+We use:
+
+- [semtag](https://github.com/pnikosis/semtag) for automated semver tagging. I greatly appreciate the author(pnikosis)'s effort on creating it and their kindness to share it!
@@ -1,18 +1,21 @@
 # Helmfile Users

-The following table is compiled from public information or from survey responses. If you are using Helmfile in your
-company or organization, we would like to invite you to [participate in our user survey](https://docs.google.com/forms/d/e/1FAIpQLSfrF5kR9nXsr5yWqNZGgN-KquM1mBTuYNn5lRmEVXEvhq0VIQ/viewform)
-to help us extend this list.
+Who's actually using Helmfile? The following table is compiled from public information, survey response and PRs. It's
+likely this is only a small selection of actual users, but it's a start.
+
+If you are using Helmfile in your company or organization, we would like to invite you to create a PR to add your
+information to this file.

 <!-- TABLE_START -->
-| Organization | Workload | More Info | Location |
-|---|---|---|---|
-| [reddit.com](https://www.reddit.com/) | production | [GitHub issue](https://github.com/roboll/helmfile/issues/96#issue-312012249) | San Francisco, CA, US |
-| [ricardo.ch](https://www.ricardo.ch/) | proof-of-concept | | Zug, Switzerland |
+| Organization | Workload | More Info | Location | Added |
+|---|---|---|---|---|
+| [reddit.com](https://www.reddit.com/) | production | [GitHub issue](https://github.com/roboll/helmfile/issues/96#issue-312012249), [Talk](https://www.slideshare.net/GregoryTaylor11/helm-at-reddit-from-local-dev-staging-to-production) | San Francisco, CA | April 2018 |
+| [ricardo.ch](https://www.ricardo.ch/) | production | We're deploying our complete application platform using Helmfile. | Zug, Switzerland | April 2018 |
+| [Sight Machine](https://sightmachine.com/) | production | We don't have anything publicly posted about it, but have been using it for quite a while in production. | San Francisco, CA and Ann Arbor, MI | December 2018 |
+| [VSHN – The DevOps Company](https://vshn.ch) | production	| | Zurich, Switzerland | March 2019 |
+| [Vlocity](https://vlocity.com/) | proof-of-concept | | Melbourne, Australia | March 2019 |
+| [transit](https://transit.app/) | production | [Blog post](https://medium.com/@naseem_60378/helmfile-its-like-a-helm-for-your-helm-74a908581599). | Montreal, Canada | March 2019 |
+| [uniqkey](https://uniqkey.eu/) | production | [Wiki Page](https://ocd-scm.github.io/ocd-meta/) | Copenhagen, Denmark | April 2019 |
+| [bitsofinfo](https://github.com/bitsofinfo/helmfile-deploy) | production | Used with [helmfile-deploy](https://github.com/bitsofinfo/helmfile-deploy) to manage releases for dozens of apps | USA | July 2019 |
+| [kloeckner-i](https://www.kloeckner-i.com/) | production | We are deploying our standard tools via helmfile to all our clusters.  | Berlin, Germany | September 2019 |
 <!-- TABLE_END -->
-
-## Contact
-
-Please fill out [the Google form](https://docs.google.com/forms/d/e/1FAIpQLSfrF5kR9nXsr5yWqNZGgN-KquM1mBTuYNn5lRmEVXEvhq0VIQ/viewform) to add your organization instead of opening a PR.
-
-You can also [reach the maintainer on Twitter](https://twitter.com/DerCed).
@@ -1,100 +0,0 @@
-package args
-
-import (
-	"fmt"
-	"strings"
-
-	"github.com/roboll/helmfile/state"
-)
-
-type argMap struct {
-	m     map[string]string
-	flags []string
-}
-
-func (a *argMap) SetArg(flag, arg string) {
-	if _, exists := a.m[flag]; !exists {
-		a.m[flag] = arg
-		a.flags = append(a.flags, flag)
-	}
-}
-
-func newArgMap() *argMap {
-	return &argMap{m: map[string]string{}}
-}
-
-func GetArgs(args string, state *state.HelmState) []string {
-	//args := c.String("args")
-	argsMap := newArgMap()
-	spaceflagArg := map[string]bool{}
-
-	if len(args) > 0 {
-		argsVals := strings.Split(args, " ")
-		prevFlag := ""
-		for _, arg := range argsVals {
-			if strings.HasPrefix(arg, "--") {
-				argVal := strings.SplitN(arg, "=", 2)
-				if len(argVal) > 1 {
-					arg := argVal[0]
-					value := argVal[1]
-					argsMap.SetArg(arg, value)
-				} else {
-					argsMap.SetArg(arg, "")
-				}
-				prevFlag = arg
-			} else {
-				spaceflagArg[prevFlag] = true
-				argsMap.m[prevFlag] = arg
-			}
-		}
-	}
-
-	if len(state.HelmDefaults.Args) > 0 {
-		for _, arg := range state.HelmDefaults.Args {
-			var flag string
-			var val string
-
-			argsNum, _ := fmt.Sscanf(arg, "--%s %s", &flag, &val)
-			if argsNum == 2 {
-				argsMap.SetArg(flag, arg)
-			} else {
-				argVal := strings.SplitN(arg, "=", 2)
-				argFirst := argVal[0]
-				if len(argVal) > 1 {
-					val = argVal[1]
-					argsMap.SetArg(argFirst, val)
-				} else {
-					argsMap.SetArg(argFirst, "")
-				}
-			}
-		}
-	}
-
-	if state.HelmDefaults.TillerNamespace != "" {
-		argsMap.SetArg("--tiller-namespace", state.HelmDefaults.TillerNamespace)
-	}
-	if state.HelmDefaults.KubeContext != "" {
-		argsMap.SetArg("--kube-context", state.HelmDefaults.KubeContext)
-	}
-
-	var argArr []string
-
-	for _, flag := range argsMap.flags {
-		val := argsMap.m[flag]
-
-		if val != "" {
-			if spaceflagArg[flag] {
-				argArr = append(argArr, fmt.Sprintf("%s %s", flag, val))
-			} else {
-				argArr = append(argArr, fmt.Sprintf("%s=%s", flag, val))
-			}
-
-		} else {
-			argArr = append(argArr, fmt.Sprintf("%s", flag))
-		}
-	}
-
-	state.HelmDefaults.Args = argArr
-
-	return state.HelmDefaults.Args
-}
@@ -1,34 +0,0 @@
-package args
-
-import (
-	"fmt"
-	"strings"
-	"testing"
-
-	"github.com/roboll/helmfile/state"
-)
-
-func TestGetArgs(t *testing.T) {
-	args := "--timeout=3600 --set app1.bootstrap=true,app2.bootstrap=false --tiller-namespace ns"
-	defaultArgs := []string{"--recreate-pods", "--force"}
-	fmt.Println(defaultArgs)
-	fmt.Println(len(defaultArgs))
-	Helmdefaults := state.HelmSpec{KubeContext: "test", TillerNamespace: "test-namespace", Args: defaultArgs}
-	testState := &state.HelmState{HelmDefaults: Helmdefaults}
-	receivedArgs := GetArgs(args, testState)
-
-	expectedOutput := "--timeout=3600 --set app1.bootstrap=true,app2.bootstrap=false --tiller-namespace ns --recreate-pods --force --kube-context=test"
-
-	if compareArgs(expectedOutput, receivedArgs) == false {
-		t.Errorf("expected %s, got %s", expectedOutput, strings.Join(receivedArgs, " "))
-	}
-}
-
-func compareArgs(expectedArgs string, args []string) bool {
-
-	if strings.Compare(strings.Join(args, " "), expectedArgs) != 0 {
-		return false
-	}
-	return true
-
-}
@@ -0,0 +1,152 @@
+# Shared Configuration Across Teams
+
+Assume you have a two or more teams, each works for a different internal or external service, like:
+
+- Product 1
+- Product 2
+- Observability
+
+The simplest `helmfile.yaml` that declares the whole cluster that is composed of the three services would look like the below:
+
+```yaml
+releases:
+- name: product1-api
+  chart: product1-charts/api
+  # snip
+- name: product1-web
+  chart: product1-charts/web
+  # snip
+- name: product2-api
+  chart: saas-charts/api
+  # snip
+- name: product2-web
+  chart: product2-charts/web
+  # snip
+- name: observability-prometheus-operator
+  chart: stable/prometheus-operator
+  # snip
+- name: observability-process-exporter
+  chart: stable/prometheus-operator
+  # snip
+```
+
+This works, but what if you wanted to a separate cluster per service to achieve smaller blast radius?
+
+Let's start by creating a `helmfile.yaml` for each service.
+
+`product1/helmfile.yaml`:
+
+```yaml
+releases:
+- name: product1-api
+  chart: product1-charts/api
+  # snip
+- name: product1-web
+  chart: product1-charts/web
+  # snip
+- name: observability-prometheus-operator
+  chart: stable/prometheus-operator
+  # snip
+- name: observability-process-exporter
+  chart: stable/prometheus-operator
+  # snip
+```
+
+`product2/helmfile.yaml`:
+
+```yaml
+releases:
+- name: product2-api
+  chart: product2-charts/api
+  # snip
+- name: product2-web
+  chart: product2-charts/web
+  # snip
+- name: observability-prometheus-operator
+  chart: stable/prometheus-operator
+  # snip
+- name: observability-process-exporter
+  chart: stable/prometheus-operator
+  # snip
+```
+
+You will (of course!) notice this isn't DRY.
+
+To remove the duplication of observability stack between the two helmfiles, create a "sub-helmfile" for the observability stack.
+
+`observability/helmfile.yaml`:
+
+```yaml
+- name: observability-prometheus-operator
+  chart: stable/prometheus-operator
+  # snip
+- name: observability-process-exporter
+  chart: stable/prometheus-operator
+  # snip
+```
+
+As you might have imagined, the observability helmfile can be reused from the two product helmfiles by declaring `helmfiles`.
+
+`product1/helmfile.yaml`:
+
+```yaml
+helmfiles:
+- ../observability/helmfile.yaml
+
+releases:
+- name: product1-api
+  chart: product1-charts/api
+  # snip
+- name: product1-web
+  chart: product1-charts/web
+  # snip
+```
+
+`product2/helmfile.yaml`:
+
+```yaml
+helmfiles:
+- ../observability/helmfile.yaml
+
+releases:
+- name: product2-api
+  chart: product2-charts/api
+  # snip
+- name: product2-web
+  chart: product2-charts/web
+  # snip
+```
+
+## Using sub-helmfile as a template
+
+You can go even further by generalizing the product related releases as a pair of `api` and `web`:
+
+`shared/helmfile.yaml`:
+
+```yaml
+releases:
+- name: product{{ env "PRODUCT_ID" }}-api
+  chart: product{{ env "PRODUCT_ID" }}-charts/api
+  # snip
+- name: product{{ env "PRODUCT_ID" }}-web
+  chart: product{{ env "PRODUCT_ID" }}-charts/web
+  # snip
+```
+
+Then you only need one single product helmfile
+
+
+`product/helmfile.yaml`:
+
+```yaml
+helmfiles:
+- ../observability/helmfile.yaml
+- ../shared/helmfile.yaml
+```
+
+Now that we use the environment variable `PRODUCT_ID` to as the parameters of release names, you need to set it before running `helmfile`, so that it produces the differently named releases per product:
+
+```console
+$ PRODUCT_ID=1 helmfile -f product/helmfile.yaml apply
+$ PRODUCT_ID=2 helmfile -f product/helmfile.yaml apply
+```
@@ -0,0 +1,358 @@
+# The Helmfile Best Practices Guide
+
+This guide covers the Helmfile’s considered patterns for writing advanced helmfiles. It focuses on how helmfile should be structured and executed.
+
+## Missing keys and Default values
+
+helmfile tries its best to inform users for noticing potential mistakes.
+
+One example of how helmfile achieves it is that, `helmfile` fails when you tried to access missing keys in environment values.
+
+That is, the following example let `helmfile` fail when you have no `eventApi.replicas` defined in environment values.
+
+```
+{{ .Values.eventApi.replicas | default 1 }}
+```
+
+In case it isn't a mistake and you do want to allow missing keys, use the `getOrNil` template function:
+
+```
+{{ .Values | getOrNil "eventApi.replicas" }}
+```
+
+This result in printing `<no value` in your template, that may or may not result in a failure.
+
+If you want a kind of default values that is used when a missing key was referenced, use `default` like:
+
+```
+{{ .Values | getOrNil "eventApi.replicas" | default 1 }}
+```
+
+Now, you get `1` when there is no `eventApi.replicas` defined in environment values.
+
+## Release Template / Conventional Directory Structure
+
+Introducing helmfile into a large-scale project that involes dozens of releases often results in a lot of repetitions in `helmfile.yaml` files.
+
+The example below shows repetitions in `namespace`, `chart`, `values`, and `secrets`:
+
+```yaml
+releases:
+# *snip*
+- name: heapster
+  namespace: kube-system
+  chart: stable/heapster
+  version: 0.3.2
+  values:
+  - "./config/heapster/values.yaml"
+  - "./config/heapster/{{ .Environment.Name }}.yaml"
+  secrets:
+  - "./config/heapster/secrets.yaml"
+  - "./config/heapster/{{ .Environment.Name }}-secrets.yaml"
+
+- name: kubernetes-dashboard
+  namespace: kube-system
+  chart: stable/kubernetes-dashboard
+  version: 0.10.0
+  values:
+  - "./config/kubernetes-dashboard/values.yaml"
+  - "./config/kubernetes-dashboard/{{ .Environment.Name }}.yaml"
+  secrets:
+  - "./config/kubernetes-dashboard/secrets.yaml"
+  - "./config/kubernetes-dashboard/{{ .Environment.Name }}-secrets.yaml"
+```
+
+This is where Helmfile's advanced feature called Release Template comes handy.
+
+It allows you to abstract away the repetitions in releases into a template, which is then included and executed by using YAML anchor/alias:
+
+```yaml
+templates:
+  default: &default
+    chart: stable/{{`{{ .Release.Name }}`}}
+    namespace: kube-system
+    # This prevents helmfile exiting when it encounters a missing file
+    # Valid values are "Error", "Warn", "Info", "Debug". The default is "Error"
+    # Use "Debug" to make missing files errors invisible at the default log level(--log-level=INFO)
+    missingFileHandler: Warn
+    values:
+    - config/{{`{{ .Release.Name }}`}}/values.yaml
+    - config/{{`{{ .Release.Name }}`}}/{{`{{ .Environment.Name }}`}}.yaml
+    secrets:
+    - config/{{`{{ .Release.Name }}`}}/secrets.yaml
+    - config/{{`{{ .Release.Name }}`}}/{{`{{ .Environment.Name }}`}}-secrets.yaml
+
+releases:
+- name: heapster
+  <<: *default
+- name: kubernetes-dashboard
+  <<: *default
+```
+
+Release Templating supports the following parts of release definition:
+- basic fields: `name`, `namespace`, `chart`, `version`
+- boolean fields: `installed`, `wait`, `tillerless`, `verify` by the means of additional text
+  fields designed for templating only: `installedTemplate`, `waitTemplate`, `tillerlessTemplate`, `verifyTemplate`
+  ```yaml
+  # ...
+    installedTemplate: '{{`{{ eq .Release.Namespace "kube-system" }}`}}'
+    waitTemplate: '{{`{{ eq .Release.Labels.tag "safe" | not }}`}}'
+  # ...
+  ```
+- `set` block values:
+  ```yaml
+  # ...
+    setTemplate:
+    - name: '{{`{{ .Release.Name }}`}}'
+      values: '{{`{{ .Release.Namespace }}`}}'
+  # ...
+  ```
+- `values` and `secrets` file paths:
+  ```yaml
+  # ...
+    valuesTemplate:
+    - config/{{`{{ .Release.Name }}`}}/values.yaml
+    secrets:
+    - config/{{`{{ .Release.Name }}`}}/secrets.yaml
+  # ...
+  ```
+- inline `values` map:
+  ```yaml
+  # ...
+    valuesTemplate:
+    - image:
+        tag: `{{ .Release.Labels.tag }}`
+  # ...
+  ```
+
+See the [issue 428](https://github.com/roboll/helmfile/issues/428) for more context on how this is supposed to work.
+
+## Layering Release Values
+
+Please note, that it is not possible to layer `values` sections. If `values` is defined in the release and in the release template, only the `values` defined in the release will be considered. The same applies to `secrets` and `set`.
+
+## Layering State Files
+
+> See **Layering State Template Files** if you're layering templates.
+
+You may occasionally end up with many helmfiles that shares common parts like which repositories to use, and whichi release to be bundled by default.
+
+Use Layering to extract the common parts into a dedicated *library helmfile*s, so that each helmfile becomes DRY.
+
+Let's assume that your `helmfile.yaml` looks like:
+
+```
+bases:
+- environments.yaml
+
+releases:
+- name: metricbaet
+  chart: stable/metricbeat
+- name: myapp
+  chart: mychart
+```
+
+Whereas `environments.yaml` contained well-known environments:
+
+```yaml
+environments:
+  development:
+  production:
+```
+
+At run time, `bases` in your `helmfile.yaml` are evaluated to produce:
+
+```yaml
+---
+# environments.yaml
+environments:
+  development:
+  production:
+---
+# helmfile.yaml
+releases:
+- name: myapp
+  chart: mychart
+- name: metricbaet
+  chart: stable/metricbeat
+```
+
+Finally the resulting YAML documents are merged in the order of occurrence,
+so that your `helmfile.yaml` becomes:
+
+```yaml
+environments:
+  development:
+  production:
+
+releases:
+- name: metricbaet
+  chart: stable/metricbeat
+- name: myapp
+  chart: mychart
+```
+
+Great!
+
+Now, repeat the above steps for each your `helmfile.yaml`, so that all your helmfiles becomes DRY.
+
+Please also see [the discussion in the issue 388](https://github.com/roboll/helmfile/issues/388#issuecomment-491710348) for more advanced layering examples.
+
+## Merging Arrays in Layers
+
+Helmfile doesn't merge arrays across layers. That is, the below example doesn't work as you might have expected:
+
+```yaml
+releases:
+- name: metricbaet
+  chart: stable/metricbeat
+---
+releases:
+- name: myapp
+  chart: mychart
+```
+
+Helmfile overrides the `releases` array with the latest layer so the resulting state file will be:
+
+```yaml
+releases:
+# metricbeat release disappeared! but that's how helmfiel works
+- name: myapp
+  chart: mychart
+```
+
+A work-around is to treat the state file as a go template and use `readFile` template function to import the common part of your state file as a plain text:
+
+`common.yaml`:
+
+```yaml
+templates:
+  metricbeat: &metricbeat
+  - name: metricbeat
+    chart: stable/metricbeat
+```
+
+`helmfile.yaml`:
+
+```yaml
+{{ readFile "common.yaml" }}
+
+releases:
+- <<: *metricbeat
+- name: myapp
+  chart: mychart
+```
+
+## Layering State Template Files
+
+Do you need to make your state file even more DRY?
+
+Turned out layering state files wasn't enough for you?
+
+Helmfile supports an advanced feature that allows you to compose state "template" files to generate the final state to be processed.
+
+In the following example `helmfile.yaml.gotmpl`, each `---` separated part of the file is a go template.
+
+`helmfile.yaml.gotmpl`:
+
+```yaml
+# Part 1: Reused Enviroment Values
+bases:
+  - myenv.yaml
+---
+# Part 2: Reused Defaults
+bases:
+  - mydefaults.yaml
+---
+# Part 3: Dynamic Releases
+releases:
+  - name: test1
+    chart: mychart-{{ .Values.myname }}
+    values:
+      replicaCount: 1
+      image:
+        repository: "nginx"
+        tag: "latest"
+```
+
+Suppose the `myenv.yaml` and `test.env.yaml` loaded in the first part looks like:
+
+`myenv.yaml`:
+
+```yaml
+environments:
+  test:
+    values:
+      - test.env.yaml
+```
+
+`test.env.yaml`:
+
+```yaml
+kubeContext: test
+wait: false
+cvOnly: false
+myname: "dog"
+```
+
+Where the gotmpl file loaded in the second part looks like:
+
+`mydefaults.yaml.gotmpl`:
+
+```yaml
+helmDefaults:
+  tillerNamespace: kube-system
+  kubeContext: {{ .Values.kubeContext }}
+  verify: false
+  {{ if .Values.wait }}
+  wait: true
+  {{ else }}
+  wait: false
+  {{ end }}
+  timeout: 600
+  recreatePods: false
+  force: true
+```
+
+Each go template is rendered in the context where `.Values` is inherited from the previous part. 
+
+So in `mydefaults.yaml.gotmpl`, both `.Values.kubeContext` and `.Values.wait` are valid as they do exist in the environment values inherited from the previous part(=the first part) of your `helmfile.yaml.gotmpl`, and therefore the template is rendered to:
+
+```yaml
+helmDefaults:
+  tillerNamespace: kube-system
+  kubeContext: test
+  verify: false
+  wait: false
+  timeout: 600
+  recreatePods: false
+  force: true
+```
+
+Similarly, the third part of the top-level `helmfile.yaml.gotmpl`, `.Values.myname` is valid as it is included in the environment values inherited from the previous parts:
+
+```yaml
+# Part 3: Dynamic Releases
+releases:
+  - name: test1
+    chart: mychart-{{ .Values.myname }}
+    values:
+      replicaCount: 1
+      image:
+        repository: "nginx"
+        tag: "latest"
+````
+
+hence rendered to:
+
+```yaml
+# Part 3: Dynamic Releases
+releases:
+  - name: test1
+    chart: mychart-dog
+    values:
+      replicaCount: 1
+      image:
+        repository: "nginx"
+        tag: "latest"
+```
@@ -0,0 +1,28 @@
+module github.com/roboll/helmfile
+
+go 1.13
+
+require (
+	github.com/Masterminds/goutils v1.1.0 // indirect
+	github.com/Masterminds/semver v1.4.1
+	github.com/Masterminds/sprig v2.22.0+incompatible
+	github.com/go-test/deep v1.0.3
+	github.com/google/go-cmp v0.3.0
+	github.com/google/uuid v0.0.0-20161128191214-064e2069ce9c // indirect
+	github.com/gosuri/uitable v0.0.3
+	github.com/hashicorp/go-getter v1.3.0
+	github.com/huandu/xstrings v1.2.0 // indirect
+	github.com/imdario/mergo v0.3.6
+	github.com/mitchellh/copystructure v1.0.0 // indirect
+	github.com/pkg/errors v0.8.1 // indirect
+	github.com/r3labs/diff v0.0.0-20190801153147-a71de73c46ad
+	github.com/tatsushid/go-prettytable v0.0.0-20141013043238-ed2d14c29939
+	github.com/urfave/cli v0.0.0-20160620154522-6011f165dc28
+	go.uber.org/atomic v1.3.2 // indirect
+	go.uber.org/multierr v1.1.0
+	go.uber.org/zap v1.8.0
+	gopkg.in/yaml.v2 v2.2.1
+	gotest.tools v2.2.0+incompatible
+)
+
+replace git.apache.org/thrift.git => github.com/apache/thrift v0.12.0
@@ -0,0 +1,224 @@
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+dmitri.shuralyov.com/html/belt v0.0.0-20180602232347-f7d459c86be0/go.mod h1:JLBrvjyP0v+ecvNYvCpyZgu5/xkfAUhi6wJj28eUfSU=
+dmitri.shuralyov.com/service/change v0.0.0-20181023043359-a85b471d5412/go.mod h1:a1inKt/atXimZ4Mv927x+r7UpyzRUf4emIoiiSC2TN4=
+dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D6DFvNNtx+9ybjezNCa8XF0xaYcETyp6rHWU=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
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+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gotest.tools v2.2.0+incompatible h1:VsBPFP1AI068pPrMxtb/S8Zkgf9xEmTLJjfM+P5UIEo=
+gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
+grpc.go4.org v0.0.0-20170609214715-11d0a25b4919/go.mod h1:77eQGdRu53HpSqPFJFmuJdjuHRquDANNeA4x7B8WQ9o=
+honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+sourcegraph.com/sourcegraph/go-diff v0.5.0/go.mod h1:kuch7UrkMzY0X+p9CRK03kfuPQ2zzQcaEFbx8wA8rck=
+sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0=
@@ -0,0 +1,623 @@
+#!/usr/bin/env bash
+
+PROG=semtag
+PROG_VERSION="v0.1.0"
+
+SEMVER_REGEX="^v?(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)(\-[0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*)?(\+[0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*)?$"
+IDENTIFIER_REGEX="^\-([0-9A-Za-z-]+)\.([0-9A-Za-z-]+)*$"
+
+# Global variables
+FIRST_VERSION="v0.0.0"
+finalversion=$FIRST_VERSION
+lastversion=$FIRST_VERSION
+hasversiontag="false"
+scope="patch"
+displayonly="false"
+forcetag="false"
+forcedversion=
+versionname=
+identifier=
+
+HELP="\
+Usage:
+  $PROG
+  $PROG getlast
+  $PROG getfinal
+  $PROG (final|alpha|beta|candidate) [-s <scope> (major|minor|patch|auto) | -o]
+  $PROG --help
+  $PROG --version
+Options:
+  -s         The scope that must be increased, can be major, minor or patch.
+               The resulting version will match X.Y.Z(-PRERELEASE)(+BUILD)
+               where X, Y and Z are positive integers, PRERELEASE is an optionnal
+               string composed of alphanumeric characters describing if the build is
+               a release candidate, alpha or beta version, with a number.
+               BUILD is also an optional string composed of alphanumeric
+               characters and hyphens.
+               Setting the scope as 'auto', the script will chose the scope between
+               'minor' and 'patch', depending on the amount of lines added (<10% will
+               choose patch).
+  -v         Specifies manually the version to be tagged, must be a valid semantic version
+               in the format X.Y.Z where X, Y and Z are positive integers.
+  -o         Output the version only, shows the bumped version, but doesn't tag.
+  -f         Forces to tag, even if there are unstaged or uncommited changes.
+Commands:
+  --help     Print this help message.
+  --version  Prints the program's version.
+  get        Returns both current final version and last tagged version.
+  getlast    Returns the latest tagged version.
+  getfinal   Returns the latest tagged final version.
+  getcurrent Returns the current version, based on the latest one, if there are uncommited or
+               unstaged changes, they will be reflected in the version, adding the number of
+               pending commits, current branch and commit hash.
+  final      Tags the current build as a final version, this only can be done on the master branch.
+  candidate  Tags the current build as a release candidate, the tag will contain all
+               the commits from the last final version.
+  alpha      Tags the current build as an alpha version, the tag will contain all
+               the commits from the last final version.
+  beta       Tags the current build as a beta version, the tag will contain all
+               the commits from the last final version."
+
+# Commands and options
+ACTION="getlast"
+ACTION="$1"
+shift
+
+# We get the parameters
+while getopts "v:s:of" opt; do
+  case $opt in
+    v)
+      forcedversion="$OPTARG"
+      ;;
+    s)
+      scope="$OPTARG"
+      ;;
+    o)
+      displayonly="true"
+      ;;
+    f)
+      forcetag="true"
+      ;;
+    \?)
+      echo "Invalid option: -$OPTARG" >&2
+      exit 1
+      ;;
+    :)
+      echo "Option -$OPTARG requires an argument." >&2
+      exit 1
+      ;;
+  esac
+done
+
+# Gets a string with the version and returns an array of maximum size of 5 with all the parts of the sematinc version
+# $1 The string containing the version in semantic format
+# $2 The variable to store the result array:
+#      position 0: major number
+#      position 1: minor number
+#      position 2: patch number
+#      position 3: identifier (or prerelease identifier)
+#      position 4: build info
+function explode_version {
+  local __version=$1
+  local __result=$2
+  if [[ $__version =~ $SEMVER_REGEX ]] ; then
+    local __major=${BASH_REMATCH[1]}
+    local __minor=${BASH_REMATCH[2]}
+    local __patch=${BASH_REMATCH[3]}
+    local __prere=${BASH_REMATCH[4]}
+    local __build=${BASH_REMATCH[5]}
+    eval "$__result=(\"$__major\" \"$__minor\" \"$__patch\" \"$__prere\" \"$__build\")"
+  else
+    eval "$__result="
+  fi
+}
+
+# Compare two versions and returns -1, 0 or 1
+# $1 The first version to compare
+# $2 The second version to compare
+# $3 The variable where to store the result
+function compare_versions {
+  local __first
+  local __second
+  explode_version $1 __first
+  explode_version $2 __second
+  local lv=$3
+
+  # Compares MAJOR, MINOR and PATCH
+  for i in 0 1 2; do
+    local __numberfirst=${__first[$i]}
+    local __numbersecond=${__second[$i]}
+    case $(($__numberfirst - $__numbersecond)) in
+      0)
+        ;;
+      -[0-9]*)
+        eval "$lv=-1"
+        return 0
+        ;;
+      [0-9]*)
+        eval "$lv=1"
+        return 0
+        ;;
+    esac
+  done
+
+  # Identifiers should compare with the ASCII order.
+  local __identifierfirst=${__first[3]}
+  local __identifiersecond=${__second[3]}
+  if [[ -n "$__identifierfirst" ]] && [[ -n "$__identifiersecond" ]]; then
+    if [[ "$__identifierfirst" > "$__identifiersecond" ]]; then
+      eval "$lv=1"
+      return 0
+    elif [[ "$__identifierfirst" < "$__identifiersecond" ]]; then
+      eval "$lv=-1"
+      return 0
+    fi
+  elif [[ -z "$__identifierfirst" ]] && [[ -n "$__identifiersecond" ]]; then
+    eval "$lv=1"
+    return 0
+  elif [[ -n "$__identifierfirst" ]] && [[ -z "$__identifiersecond" ]]; then
+    eval "$lv=-1"
+    return 0
+  fi
+
+  eval "$lv=0"
+}
+
+# Returns the last version of two
+# $1 The first version to compare
+# $2 The second version to compare
+# $3 The variable where to store the last one
+function get_latest_of_two {
+  local __first=$1
+  local __second=$2
+  local __result
+  local __latest=$3
+  compare_versions $__first $__second __result
+  case $__result in
+    0)
+      eval "$__latest=$__second"
+      ;;
+    -1)
+      eval "$__latest=$__second"
+      ;;
+    1)
+      eval "$__latest=$__first"
+      ;;
+  esac
+}
+
+# Assigns a 2 size array with the identifier, having the identifier at pos 0, and the number in pos 1
+# $1 The identifier in the format -id.#
+# $2 The vferiable where to store the 2 size array
+function explode_identifier {
+  local __identifier=$1
+  local __result=$2
+  if [[ $__identifier =~ $IDENTIFIER_REGEX ]] ; then
+    local __id=${BASH_REMATCH[1]}
+    local __number=${BASH_REMATCH[2]}
+    if [[ -z "$__number" ]]; then
+      __number=1
+    fi
+    eval "$__result=(\"$__id\" \"$__number\")"
+  else
+    eval "$__result="
+  fi
+}
+
+# Gets a list of tags and assigns the base and latest versions
+# Receives an array with the tags containing the versions
+# Assigns to the global variables finalversion and lastversion the final version and the latest version
+function get_latest {
+  local __taglist=("$@")
+  local __tagsnumber=${#__taglist[@]}
+  local __current
+  case $__tagsnumber in
+    0)
+      finalversion=$FIRST_VERSION
+      lastversion=$FIRST_VERSION
+      ;;
+    1)
+      __current=${__taglist[0]}
+      explode_version $__current ver
+      if [ -n "$ver" ]; then
+        if [ -n "${ver[3]}" ]; then
+          finalversion=$FIRST_VERSION
+        else
+          finalversion=$__current
+        fi
+        lastversion=$__current
+      else
+        finalversion=$FIRST_VERSION
+        lastversion=$FIRST_VERSION
+      fi
+      ;;
+    *)
+      local __lastpos=$(($__tagsnumber-1))
+      for i in $(seq 0 $__lastpos)
+      do
+        __current=${__taglist[i]}
+        explode_version ${__taglist[i]} ver
+        if [ -n "$ver" ]; then
+          if [ -z "${ver[3]}" ]; then
+            get_latest_of_two $finalversion $__current finalversion
+            get_latest_of_two $lastversion $finalversion lastversion
+          else
+            get_latest_of_two $lastversion $__current lastversion
+          fi
+        fi
+      done
+      ;;
+  esac
+
+  if git rev-parse -q --verify "refs/tags/$lastversion" >/dev/null; then
+    hasversiontag="true"
+  else
+    hasversiontag="false"
+  fi
+}
+
+# Gets the next version given the provided scope
+# $1 The version that is going to be bumped
+# $2 The scope to bump
+# $3 The variable where to stoer the result
+function get_next_version {
+  local __exploded
+  local __fromversion=$1
+  local __scope=$2
+  local __result=$3
+  explode_version $__fromversion __exploded
+  case $__scope in
+    major)
+      __exploded[0]=$((${__exploded[0]}+1))
+      __exploded[1]=0
+      __exploded[2]=0
+    ;;
+    minor)
+      __exploded[1]=$((${__exploded[1]}+1))
+      __exploded[2]=0
+    ;;
+    patch)
+      __exploded[2]=$((${__exploded[2]}+1))
+    ;;
+  esac
+
+  eval "$__result=v${__exploded[0]}.${__exploded[1]}.${__exploded[2]}"
+}
+
+function bump_version {
+  ## First we try to get the next version based on the existing last one
+  if [ "$scope" == "auto" ]; then
+    get_scope_auto scope
+  fi
+
+  local __candidatefromlast=$FIRST_VERSION
+  local __explodedlast
+  explode_version $lastversion __explodedlast
+  if [[ -n "${__explodedlast[3]}" ]]; then
+    # Last version is not final
+    local __idlast
+    explode_identifier ${__explodedlast[3]} __idlast
+    
+    # We get the last, given the desired id based on the scope
+    __candidatefromlast="v${__explodedlast[0]}.${__explodedlast[1]}.${__explodedlast[2]}"
+    if [[ -n "$identifier" ]]; then
+      local __nextid="$identifier.1"
+      if [ "$identifier" == "${__idlast[0]}" ]; then
+        # We target the same identifier as the last so we increase one
+        __nextid="$identifier.$(( ${__idlast[1]}+1 ))"
+        __candidatefromlast="$__candidatefromlast-$__nextid"
+      else
+        # Different identifiers, we make sure we are assigning a higher identifier, if not, we increase the version
+        __candidatefromlast="$__candidatefromlast-$__nextid"
+        local __comparedwithlast
+        compare_versions $__candidatefromlast $lastversion __comparedwithlast
+        if [ "$__comparedwithlast" == -1 ]; then
+          get_next_version $__candidatefromlast $scope __candidatefromlast
+          __candidatefromlast="$__candidatefromlast-$__nextid"
+        fi
+      fi
+    fi
+  fi
+
+  # Then we try to get the version based on the latest final one
+  local __candidatefromfinal=$FIRST_VERSION
+  get_next_version $finalversion $scope __candidatefromfinal
+  if [[ -n "$identifier" ]]; then
+    __candidatefromfinal="$__candidatefromfinal-$identifier.1"
+  fi
+
+  # Finally we compare both candidates
+  local __resultversion
+  local __result
+  compare_versions $__candidatefromlast $__candidatefromfinal __result
+  case $__result in
+    0)
+      __resultversion=$__candidatefromlast
+      ;;
+    -1)
+      __resultversion="$__candidatefromfinal"
+      ;;
+    1)
+      __resultversion=$__candidatefromlast
+      ;;
+  esac
+
+  eval "$1=$__resultversion"
+}
+
+function increase_version {
+  local __version=
+
+  if [ -z $forcedversion ]; then
+    bump_version __version
+  else
+    if [[ $forcedversion =~ $SEMVER_REGEX ]] ; then
+      compare_versions $forcedversion $lastversion __result
+      if [ $__result -le 0 ]; then
+        echo "Version can't be lower than last version: $lastversion"
+        exit 1
+      fi
+    else
+      echo "Non valid version to bump"
+      exit 1
+    fi
+    __version=$forcedversion
+  fi
+
+  if [ "$displayonly" == "true" ]; then
+    echo "$__version"
+  else
+    if [ "$forcetag" == "false" ]; then
+      check_git_dirty_status
+    fi
+    local __commitlist
+    if [ "$finalversion" == "$FIRST_VERSION" ] || [ "$hasversiontag" != "true" ]; then
+      __commitlist="$(git log --pretty=oneline | cat)"
+    else
+      __commitlist="$(git log --pretty=oneline $finalversion... | cat)"
+    fi
+
+    # If we are forcing a bump, we add bump to the commit list
+    if [[ -z $__commitlist && "$forcetag" == "true" ]]; then
+      __commitlist="bump"
+    fi
+
+    if [[ -z $__commitlist ]]; then
+      echo "No commits since the last final version, not bumping version"
+    else
+      if [[ -z $versionname ]]; then
+        versionname=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
+      fi
+      local __message="$versionname
+$__commitlist"
+
+      # We check we have info on the user
+      local __username=$(git config user.name)
+      if [ -z "$__username" ]; then
+        __username=$(id -u -n)
+        git config user.name $__username
+      fi
+      local __useremail=$(git config user.email)
+      if [ -z "$__useremail" ]; then
+        __useremail=$(hostname)
+        git config user.email "$__username@$__useremail"
+      fi
+
+      git tag -a $__version -m "$__message" 
+
+      # If we have a remote, we push there
+      local __remote=${SEMTAG_REMOTE:-$(git remote)}
+      if [[ -n $__remote ]]; then
+        git push $__remote $__version > /dev/null
+        if [ $? -eq 0 ]; then
+          echo "$__version"
+        else
+          echo "Error pushing the tag $__version to $__remote"
+          exit 1
+        fi
+      else
+        echo "$__version"
+      fi
+    fi
+  fi
+}
+
+function check_git_dirty_status {
+  local __repostatus=
+  get_work_tree_status __repostatus
+
+  if [ "$__repostatus" == "uncommitted" ]; then
+    echo "ERROR: You have uncommitted changes"
+    git status --porcelain
+    exit 1
+  fi
+
+  if [ "$__repostatus" == "unstaged" ]; then
+    echo "ERROR: You have unstaged changes"
+    git status --porcelain
+    exit 1
+  fi
+}
+
+# Get the total amount of lines of code in the repo
+function get_total_lines {
+  local __empty_id="$(git hash-object -t tree /dev/null)"
+  local __changes="$(git diff --numstat $__empty_id | cat)"
+  local __added_deleted=$1
+  get_changed_lines "$__changes" $__added_deleted
+}
+
+# Get the total amount of lines of code since the provided tag
+function get_sincetag_lines {
+  local __sincetag=$1
+  local __changes="$(git diff --numstat $__sincetag | cat)"
+  local __added_deleted=$2
+  get_changed_lines "$__changes" $__added_deleted
+}
+
+function get_changed_lines {
+  local __changes_numstat=$1
+  local __result=$2
+  IFS=$'\n' read -rd '' -a __changes_array <<<"$__changes_numstat"
+  local __diff_regex="^([0-9]+)[[:space:]]+([0-9]+)[[:space:]]+.+$"
+
+  local __total_added=0
+  local __total_deleted=0
+  for i in "${__changes_array[@]}"
+  do
+    if [[ $i =~ $__diff_regex ]] ; then
+      local __added=${BASH_REMATCH[1]}
+      local __deleted=${BASH_REMATCH[2]}
+      __total_added=$(( $__total_added+$__added ))
+      __total_deleted=$(( $__total_deleted+$__deleted ))
+    fi
+  done
+  eval "$2=( $__total_added $__total_deleted )"
+}
+
+function get_scope_auto {
+  local __verbose=$2
+  local __total=0
+  local __since=0
+  local __scope=
+
+  get_total_lines __total
+  get_sincetag_lines $finalversion __since
+
+  local __percentage=0
+  if [ "$__total" != "0" ]; then
+    local __percentage=$(( 100*$__since/$__total ))
+    if [ $__percentage -gt "10" ]; then
+      __scope="minor"
+    else
+      __scope="patch"
+    fi
+  fi
+
+  eval "$1=$__scope"
+  if [[ -n "$__verbose" ]]; then
+    echo "[Auto Scope] Percentage of lines changed: $__percentage"
+    echo "[Auto Scope] : $__scope"
+  fi
+}
+
+function get_work_tree_status {
+  # Update the index
+  git update-index -q --ignore-submodules --refresh > /dev/null
+  eval "$1="
+
+  if ! git diff-files --quiet --ignore-submodules -- > /dev/null
+  then
+    eval "$1=unstaged"
+  fi
+
+  if ! git diff-index --cached --quiet HEAD --ignore-submodules -- > /dev/null
+  then
+    eval "$1=uncommitted"
+  fi
+}
+
+function get_current {
+  if [ "$hasversiontag" == "true" ]; then
+    local __commitcount="$(git rev-list $lastversion.. --count)"
+  else
+    local __commitcount="$(git rev-list --count HEAD)"
+  fi
+  local __status=
+  get_work_tree_status __status
+  
+  if [ "$__commitcount" == "0" ] && [ -z "$__status" ]; then
+    eval "$1=$lastversion"
+  else
+    local __buildinfo="$(git rev-parse --short HEAD)"
+    local __currentbranch="$(git rev-parse --abbrev-ref HEAD)"
+    if [ "$__currentbranch" != "master" ]; then
+      __buildinfo="$__currentbranch.$__buildinfo"
+    fi
+
+    local __suffix=
+    if [ "$__commitcount" != "0" ]; then
+      if [ -n "$__suffix" ]; then
+        __suffix="$__suffix."
+      fi
+      __suffix="$__suffix$__commitcount"
+    fi
+    if [ -n "$__status" ]; then
+      if [ -n "$__suffix" ]; then
+        __suffix="$__suffix."
+      fi
+      __suffix="$__suffix$__status"
+    fi
+
+    __suffix="$__suffix+$__buildinfo"
+    if [ "$lastversion" == "$finalversion" ]; then
+      scope="patch"
+      identifier=
+      local __bumped=
+      bump_version __bumped
+      eval "$1=$__bumped-dev.$__suffix"
+    else
+      eval "$1=$lastversion.$__suffix"
+    fi
+  fi
+}
+
+function init {
+  git fetch > /dev/null
+  TAGS="$(git tag)"
+  IFS=$'\n' read -rd '' -a TAG_ARRAY <<<"$TAGS"
+
+  get_latest ${TAG_ARRAY[@]}
+  currentbranch="$(git rev-parse --abbrev-ref HEAD)"
+}
+
+case $ACTION in
+  --help)
+    echo -e "$HELP"
+    ;;
+  --version)
+    echo -e "${PROG}: $PROG_VERSION"
+    ;;
+  final)
+    init
+    diff=$(git diff master | cat)
+    if [ "$forcetag" == "false" ]; then
+      if [ -n "$diff" ]; then
+        echo "ERROR: Branch must be updated with master for final versions"
+        exit 1
+      fi
+    fi
+    increase_version
+    ;;
+  alpha|beta)
+    init
+    identifier="$ACTION"
+    increase_version
+    ;;
+  candidate)
+    init
+    identifier="rc"
+    increase_version
+    ;;
+  getlast)
+    init
+    echo "$lastversion"
+    ;;
+  getfinal)
+    init
+    echo "$finalversion"
+    ;;
+  getcurrent)
+    init
+    get_current current
+    echo "$current"
+    ;;
+  get)
+    init
+    echo "Current final version: $finalversion"
+    echo "Last tagged version:   $lastversion"
+    ;;
+  *)
+    echo "'$ACTION' is not a valid command, see --help for available commands."
+    ;;
+esac
@@ -1,159 +0,0 @@
-package helmexec
-
-import (
-	"io"
-	"strings"
-
-	"go.uber.org/zap"
-	"go.uber.org/zap/zapcore"
-)
-
-const (
-	command = "helm"
-)
-
-type execer struct {
-	helmBinary  string
-	runner      Runner
-	logger      *zap.SugaredLogger
-	kubeContext string
-	extra       []string
-}
-
-func NewLogger(writer io.Writer, logLevel string) *zap.SugaredLogger {
-	var cfg zapcore.EncoderConfig
-	cfg.MessageKey = "message"
-	out := zapcore.AddSync(writer)
-	var level zapcore.Level
-	err := level.Set(logLevel)
-	if err != nil {
-		panic(err)
-	}
-	core := zapcore.NewCore(
-		zapcore.NewConsoleEncoder(cfg),
-		out,
-		level,
-	)
-	return zap.New(core).Sugar()
-}
-
-// New for running helm commands
-func New(logger *zap.SugaredLogger, kubeContext string) *execer {
-	return &execer{
-		helmBinary:  command,
-		logger:      logger,
-		kubeContext: kubeContext,
-		runner:      &ShellRunner{},
-	}
-}
-
-func (helm *execer) SetExtraArgs(args ...string) {
-	helm.extra = args
-}
-
-func (helm *execer) SetHelmBinary(bin string) {
-	helm.helmBinary = bin
-}
-
-func (helm *execer) AddRepo(name, repository, certfile, keyfile, username, password string) error {
-	var args []string
-	args = append(args, "repo", "add", name, repository)
-	if certfile != "" && keyfile != "" {
-		args = append(args, "--cert-file", certfile, "--key-file", keyfile)
-	}
-	if username != "" && password != "" {
-		args = append(args, "--username", username, "--password", password)
-	}
-	helm.logger.Infof("Adding repo %v %v", name, repository)
-	out, err := helm.exec(args...)
-	helm.write(out)
-	return err
-}
-
-func (helm *execer) UpdateRepo() error {
-	helm.logger.Info("Updating repo")
-	out, err := helm.exec("repo", "update")
-	helm.write(out)
-	return err
-}
-
-func (helm *execer) UpdateDeps(chart string) error {
-	helm.logger.Infof("Updating dependency %v", chart)
-	out, err := helm.exec("dependency", "update", chart)
-	helm.write(out)
-	return err
-}
-
-func (helm *execer) SyncRelease(name, chart string, flags ...string) error {
-	helm.logger.Infof("Upgrading %v", chart)
-	out, err := helm.exec(append([]string{"upgrade", "--install", "--reset-values", name, chart}, flags...)...)
-	helm.write(out)
-	return err
-}
-
-func (helm *execer) ReleaseStatus(name string) error {
-	helm.logger.Infof("Getting status %v", name)
-	out, err := helm.exec(append([]string{"status", name})...)
-	helm.write(out)
-	return err
-}
-
-func (helm *execer) DecryptSecret(name string) (string, error) {
-	helm.logger.Infof("Decrypting secret %v", name)
-	out, err := helm.exec(append([]string{"secrets", "dec", name})...)
-	helm.write(out)
-	return name + ".dec", err
-}
-
-func (helm *execer) DiffRelease(name, chart string, flags ...string) error {
-	helm.logger.Infof("Comparing %v %v", name, chart)
-	out, err := helm.exec(append([]string{"diff", "upgrade", "--allow-unreleased", name, chart}, flags...)...)
-	helm.write(out)
-	return err
-}
-
-func (helm *execer) Lint(chart string, flags ...string) error {
-	helm.logger.Infof("Linting %v", chart)
-	out, err := helm.exec(append([]string{"lint", chart}, flags...)...)
-	helm.write(out)
-	return err
-}
-
-func (helm *execer) Fetch(chart string, flags ...string) error {
-	helm.logger.Infof("Fetching %v", chart)
-	out, err := helm.exec(append([]string{"fetch", chart}, flags...)...)
-	helm.write(out)
-	return err
-}
-
-func (helm *execer) DeleteRelease(name string, flags ...string) error {
-	helm.logger.Infof("Deleting %v", name)
-	out, err := helm.exec(append([]string{"delete", name}, flags...)...)
-	helm.write(out)
-	return err
-}
-
-func (helm *execer) TestRelease(name string, flags ...string) error {
-	helm.logger.Infof("Testing %v", name)
-	out, err := helm.exec(append([]string{"test", name}, flags...)...)
-	helm.write(out)
-	return err
-}
-
-func (helm *execer) exec(args ...string) ([]byte, error) {
-	cmdargs := args
-	if len(helm.extra) > 0 {
-		cmdargs = append(cmdargs, helm.extra...)
-	}
-	if helm.kubeContext != "" {
-		cmdargs = append(cmdargs, "--kube-context", helm.kubeContext)
-	}
-	helm.logger.Debugf("exec: %s %s", helm.helmBinary, strings.Join(cmdargs, " "))
-	return helm.runner.Execute(helm.helmBinary, cmdargs)
-}
-
-func (helm *execer) write(out []byte) {
-	if len(out) > 0 {
-		helm.logger.Infof("%s", out)
-	}
-}
@@ -1,355 +0,0 @@
-package helmexec
-
-import (
-	"bytes"
-	"os"
-	"reflect"
-	"testing"
-
-	"go.uber.org/zap"
-)
-
-// Mocking the command-line runner
-
-type mockRunner struct {
-	output []byte
-	err    error
-}
-
-func (mock *mockRunner) Execute(cmd string, args []string) ([]byte, error) {
-	return []byte{}, nil
-}
-
-func MockExecer(logger *zap.SugaredLogger, kubeContext string) *execer {
-	execer := New(logger, kubeContext)
-	execer.runner = &mockRunner{}
-	return execer
-}
-
-// Test methods
-
-func TestNewHelmExec(t *testing.T) {
-	buffer := bytes.NewBufferString("something")
-	logger := NewLogger(buffer, "debug")
-	helm := New(logger, "dev")
-	if helm.kubeContext != "dev" {
-		t.Error("helmexec.New() - kubeContext")
-	}
-	if buffer.String() != "something" {
-		t.Error("helmexec.New() - changed buffer")
-	}
-	if len(helm.extra) != 0 {
-		t.Error("helmexec.New() - extra args not empty")
-	}
-}
-
-func Test_SetExtraArgs(t *testing.T) {
-	helm := New(NewLogger(os.Stdout, "info"), "dev")
-	helm.SetExtraArgs()
-	if len(helm.extra) != 0 {
-		t.Error("helmexec.SetExtraArgs() - passing no arguments should not change extra field")
-	}
-	helm.SetExtraArgs("foo")
-	if !reflect.DeepEqual(helm.extra, []string{"foo"}) {
-		t.Error("helmexec.SetExtraArgs() - one extra argument missing")
-	}
-	helm.SetExtraArgs("alpha", "beta")
-	if !reflect.DeepEqual(helm.extra, []string{"alpha", "beta"}) {
-		t.Error("helmexec.SetExtraArgs() - two extra arguments missing (overwriting the previous value)")
-	}
-}
-
-func Test_SetHelmBinary(t *testing.T) {
-	helm := New(NewLogger(os.Stdout, "info"), "dev")
-	if helm.helmBinary != "helm" {
-		t.Error("helmexec.command - default command is not helm")
-	}
-	helm.SetHelmBinary("foo")
-	if helm.helmBinary != "foo" {
-		t.Errorf("helmexec.SetHelmBinary() - actual = %s expect = foo", helm.helmBinary)
-	}
-}
-
-func Test_AddRepo(t *testing.T) {
-	var buffer bytes.Buffer
-	logger := NewLogger(&buffer, "debug")
-	helm := MockExecer(logger, "dev")
-	helm.AddRepo("myRepo", "https://repo.example.com/", "cert.pem", "key.pem", "", "")
-	expected := `Adding repo myRepo https://repo.example.com/
-exec: helm repo add myRepo https://repo.example.com/ --cert-file cert.pem --key-file key.pem --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.AddRepo()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-
-	buffer.Reset()
-	helm.AddRepo("myRepo", "https://repo.example.com/", "", "", "", "")
-	expected = `Adding repo myRepo https://repo.example.com/
-exec: helm repo add myRepo https://repo.example.com/ --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.AddRepo()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-
-	buffer.Reset()
-	helm.AddRepo("myRepo", "https://repo.example.com/", "", "", "example_user", "example_password")
-	expected = `Adding repo myRepo https://repo.example.com/
-exec: helm repo add myRepo https://repo.example.com/ --username example_user --password example_password --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.AddRepo()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-}
-
-func Test_UpdateRepo(t *testing.T) {
-	var buffer bytes.Buffer
-	logger := NewLogger(&buffer, "debug")
-	helm := MockExecer(logger, "dev")
-	helm.UpdateRepo()
-	expected := `Updating repo
-exec: helm repo update --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.UpdateRepo()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-}
-
-func Test_SyncRelease(t *testing.T) {
-	var buffer bytes.Buffer
-	logger := NewLogger(&buffer, "debug")
-	helm := MockExecer(logger, "dev")
-	helm.SyncRelease("release", "chart", "--timeout 10", "--wait")
-	expected := `Upgrading chart
-exec: helm upgrade --install --reset-values release chart --timeout 10 --wait --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.SyncRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-
-	buffer.Reset()
-	helm.SyncRelease("release", "chart")
-	expected = `Upgrading chart
-exec: helm upgrade --install --reset-values release chart --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.SyncRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-}
-
-func Test_UpdateDeps(t *testing.T) {
-	var buffer bytes.Buffer
-	logger := NewLogger(&buffer, "debug")
-	helm := MockExecer(logger, "dev")
-	helm.UpdateDeps("./chart/foo")
-	expected := `Updating dependency ./chart/foo
-exec: helm dependency update ./chart/foo --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.UpdateDeps()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-
-	buffer.Reset()
-	helm.SetExtraArgs("--verify")
-	helm.UpdateDeps("./chart/foo")
-	expected = `Updating dependency ./chart/foo
-exec: helm dependency update ./chart/foo --verify --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.AddRepo()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-}
-
-func Test_DecryptSecret(t *testing.T) {
-	var buffer bytes.Buffer
-	logger := NewLogger(&buffer, "debug")
-	helm := MockExecer(logger, "dev")
-	helm.DecryptSecret("secretName")
-	expected := `Decrypting secret secretName
-exec: helm secrets dec secretName --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.DecryptSecret()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-}
-
-func Test_DiffRelease(t *testing.T) {
-	var buffer bytes.Buffer
-	logger := NewLogger(&buffer, "debug")
-	helm := MockExecer(logger, "dev")
-	helm.DiffRelease("release", "chart", "--timeout 10", "--wait")
-	expected := `Comparing release chart
-exec: helm diff upgrade --allow-unreleased release chart --timeout 10 --wait --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.DiffRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-
-	buffer.Reset()
-	helm.DiffRelease("release", "chart")
-	expected = `Comparing release chart
-exec: helm diff upgrade --allow-unreleased release chart --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.DiffRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-}
-
-func Test_DeleteRelease(t *testing.T) {
-	var buffer bytes.Buffer
-	logger := NewLogger(&buffer, "debug")
-	helm := MockExecer(logger, "dev")
-	helm.DeleteRelease("release")
-	expected := `Deleting release
-exec: helm delete release --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.DeleteRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-}
-func Test_DeleteRelease_Flags(t *testing.T) {
-	var buffer bytes.Buffer
-	logger := NewLogger(&buffer, "debug")
-	helm := MockExecer(logger, "dev")
-	helm.DeleteRelease("release", "--purge")
-	expected := `Deleting release
-exec: helm delete release --purge --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.DeleteRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-}
-
-func Test_TestRelease(t *testing.T) {
-	var buffer bytes.Buffer
-	logger := NewLogger(&buffer, "debug")
-	helm := MockExecer(logger, "dev")
-	helm.TestRelease("release")
-	expected := `Testing release
-exec: helm test release --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.TestRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-}
-func Test_TestRelease_Flags(t *testing.T) {
-	var buffer bytes.Buffer
-	logger := NewLogger(&buffer, "debug")
-	helm := MockExecer(logger, "dev")
-	helm.TestRelease("release", "--cleanup", "--timeout", "60")
-	expected := `Testing release
-exec: helm test release --cleanup --timeout 60 --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.TestRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-}
-
-func Test_ReleaseStatus(t *testing.T) {
-	var buffer bytes.Buffer
-	logger := NewLogger(&buffer, "debug")
-	helm := MockExecer(logger, "dev")
-	helm.ReleaseStatus("myRelease")
-	expected := `Getting status myRelease
-exec: helm status myRelease --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.ReleaseStatus()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-}
-
-func Test_exec(t *testing.T) {
-	var buffer bytes.Buffer
-	logger := NewLogger(&buffer, "debug")
-	helm := MockExecer(logger, "")
-	helm.exec("version")
-	expected := "exec: helm version\n"
-	if buffer.String() != expected {
-		t.Errorf("helmexec.exec()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-
-	helm = MockExecer(logger, "dev")
-	ret, _ := helm.exec("diff")
-	if len(ret) != 0 {
-		t.Error("helmexec.exec() - expected empty return value")
-	}
-
-	buffer.Reset()
-	helm = MockExecer(logger, "dev")
-	helm.exec("diff", "release", "chart", "--timeout 10", "--wait")
-	expected = "exec: helm diff release chart --timeout 10 --wait --kube-context dev\n"
-	if buffer.String() != expected {
-		t.Errorf("helmexec.exec()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-
-	buffer.Reset()
-	helm.exec("version")
-	expected = "exec: helm version --kube-context dev\n"
-	if buffer.String() != expected {
-		t.Errorf("helmexec.exec()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-
-	buffer.Reset()
-	helm.SetExtraArgs("foo")
-	helm.exec("version")
-	expected = "exec: helm version foo --kube-context dev\n"
-	if buffer.String() != expected {
-		t.Errorf("helmexec.exec()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-
-	buffer.Reset()
-	helm = MockExecer(logger, "")
-	helm.SetHelmBinary("overwritten")
-	helm.exec("version")
-	expected = "exec: overwritten version\n"
-	if buffer.String() != expected {
-		t.Errorf("helmexec.exec()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-}
-
-func Test_Lint(t *testing.T) {
-	var buffer bytes.Buffer
-	logger := NewLogger(&buffer, "debug")
-	helm := MockExecer(logger, "dev")
-	helm.Lint("path/to/chart", "--values", "file.yml")
-	expected := `Linting path/to/chart
-exec: helm lint path/to/chart --values file.yml --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.Lint()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-}
-
-func Test_Fetch(t *testing.T) {
-	var buffer bytes.Buffer
-	logger := NewLogger(&buffer, "debug")
-	helm := MockExecer(logger, "dev")
-	helm.Fetch("chart", "--version", "1.2.3", "--untar", "--untardir", "/tmp/dir")
-	expected := `Fetching chart
-exec: helm fetch chart --version 1.2.3 --untar --untardir /tmp/dir --kube-context dev
-`
-	if buffer.String() != expected {
-		t.Errorf("helmexec.Lint()\nactual = %v\nexpect = %v", buffer.String(), expected)
-	}
-}
-
-var logLevelTests = map[string]string{
-	"debug": `Adding repo myRepo https://repo.example.com/
-exec: helm repo add myRepo https://repo.example.com/ --username example_user --password example_password
-`,
-	"info": `Adding repo myRepo https://repo.example.com/
-`,
-	"warn": ``,
-}
-
-func Test_LogLevels(t *testing.T) {
-	var buffer bytes.Buffer
-	for logLevel, expected := range logLevelTests {
-		buffer.Reset()
-		logger := NewLogger(&buffer, logLevel)
-		helm := MockExecer(logger, "")
-		helm.AddRepo("myRepo", "https://repo.example.com/", "", "", "example_user", "example_password")
-		if buffer.String() != expected {
-			t.Errorf("helmexec.AddRepo()\nactual = %v\nexpect = %v", buffer.String(), expected)
-		}
-	}
-}
@@ -1,20 +0,0 @@
-package helmexec
-
-// Interface for executing helm commands
-type Interface interface {
-	SetExtraArgs(args ...string)
-	SetHelmBinary(bin string)
-
-	AddRepo(name, repository, certfile, keyfile, username, password string) error
-	UpdateRepo() error
-	UpdateDeps(chart string) error
-	SyncRelease(name, chart string, flags ...string) error
-	DiffRelease(name, chart string, flags ...string) error
-	Fetch(chart string, flags ...string) error
-	Lint(chart string, flags ...string) error
-	ReleaseStatus(name string) error
-	DeleteRelease(name string, flags ...string) error
-	TestRelease(name string, flags ...string) error
-
-	DecryptSecret(name string) (string, error)
-}
@@ -1,24 +0,0 @@
-package helmexec
-
-import (
-	"os/exec"
-)
-
-const (
-	tmpPrefix = "helmfile-"
-	tmpSuffix = "-exec"
-)
-
-// Runner interface for shell commands
-type Runner interface {
-	Execute(cmd string, args []string) ([]byte, error)
-}
-
-// ShellRunner implemention for shell commands
-type ShellRunner struct{}
-
-// Execute a shell command
-func (shell ShellRunner) Execute(cmd string, args []string) ([]byte, error) {
-	preparedCmd := exec.Command(cmd, args...)
-	return preparedCmd.CombinedOutput()
-}
@@ -2,29 +2,18 @@ package main

 import (
 	"fmt"
-	"log"
 	"os"
-	"os/signal"
-	"path/filepath"
-	"sort"
-	"syscall"
+	"strings"

-	"os/exec"
-
-	"github.com/roboll/helmfile/args"
-	"github.com/roboll/helmfile/helmexec"
-	"github.com/roboll/helmfile/state"
+	"github.com/roboll/helmfile/pkg/app"
+	"github.com/roboll/helmfile/pkg/helmexec"
+	"github.com/roboll/helmfile/pkg/maputil"
+	"github.com/roboll/helmfile/pkg/state"
 	"github.com/urfave/cli"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
 )

-const (
-	DefaultHelmfile          = "helmfile.yaml"
-	DeprecatedHelmfile       = "charts.yaml"
-	DefaultHelmfileDirectory = "helmfile.d"
-)
-
 var Version string

 var logger *zap.SugaredLogger
@@ -41,7 +30,7 @@ func configureLogging(c *cli.Context) error {
 	if err != nil {
 		return err
 	}
-	logger = helmexec.NewLogger(os.Stdout, logLevel)
+	logger = helmexec.NewLogger(os.Stderr, logLevel)
 	if c.App.Metadata == nil {
 		// Auto-initialised in 1.19.0
 		// https://github.com/urfave/cli/blob/master/CHANGELOG.md#1190---2016-11-19
@@ -53,11 +42,11 @@ func configureLogging(c *cli.Context) error {

 func main() {

-	app := cli.NewApp()
-	app.Name = "helmfile"
-	app.Usage = ""
-	app.Version = Version
-	app.Flags = []cli.Flag{
+	cliApp := cli.NewApp()
+	cliApp.Name = "helmfile"
+	cliApp.Usage = ""
+	cliApp.Version = Version
+	cliApp.Flags = []cli.Flag{
 		cli.StringFlag{
 			Name:  "helm-binary, b",
 			Usage: "path to helm binary",
@@ -66,6 +55,18 @@ func main() {
 			Name:  "file, f",
 			Usage: "load config from file or directory. defaults to `helmfile.yaml` or `helmfile.d`(means `helmfile.d/*.yaml`) in this preference",
 		},
+		cli.StringFlag{
+			Name:  "environment, e",
+			Usage: "specify the environment name. defaults to `default`",
+		},
+		cli.StringSliceFlag{
+			Name:  "state-values-set",
+			Usage: "set state values on the command line (can specify multiple or separate values with commas: key1=val1,key2=val2)",
+		},
+		cli.StringSliceFlag{
+			Name:  "state-values-file",
+			Usage: "specify state values in a YAML file",
+		},
 		cli.BoolFlag{
 			Name:  "quiet, q",
 			Usage: "Silence output. Equivalent to log-level warn",
@@ -74,13 +75,17 @@ func main() {
 			Name:  "kube-context",
 			Usage: "Set kubectl context. Uses current context by default",
 		},
+		cli.BoolFlag{
+			Name:  "no-color",
+			Usage: "Output without color",
+		},
 		cli.StringFlag{
 			Name:  "log-level",
 			Usage: "Set log level, default info",
 		},
 		cli.StringFlag{
 			Name:  "namespace, n",
-			Usage: "Set namespace. Uses the namespace set in the context by default",
+			Usage: "Set namespace. Uses the namespace set in the context by default, and is available in templates as {{ .Namespace }}",
 		},
 		cli.StringSliceFlag{
 			Name: "selector, l",
@@ -89,10 +94,36 @@ func main() {
 	--selector tier=frontend,tier!=proxy --selector tier=backend. Will match all frontend, non-proxy releases AND all backend releases.
 	The name of a release can be used as a label. --selector name=myrelease`,
 		},
+		cli.BoolFlag{
+			Name:  "allow-no-matching-release",
+			Usage: `Do not exit with an error code if the provided selector has no matching releases.`,
+		},
+		cli.BoolFlag{
+			Name:  "interactive, i",
+			Usage: "Request confirmation before attempting to modify clusters",
+		},
 	}

-	app.Before = configureLogging
-	app.Commands = []cli.Command{
+	cliApp.Before = configureLogging
+	cliApp.Commands = []cli.Command{
+		{
+			Name:  "deps",
+			Usage: "update charts based on the contents of requirements.yaml",
+			Flags: []cli.Flag{
+				cli.StringFlag{
+					Name:  "args",
+					Value: "",
+					Usage: "pass args to helm exec",
+				},
+				cli.BoolFlag{
+					Name:  "skip-repos",
+					Usage: "skip running `helm repo update` before running `helm dependency build`",
+				},
+			},
+			Action: action(func(run *app.App, c configImpl) error {
+				return run.Deps(c)
+			}),
+		},
 		{
 			Name:  "repos",
 			Usage: "sync repositories from state file (helm repo add && helm repo update)",
@@ -103,29 +134,23 @@ func main() {
 					Usage: "pass args to helm exec",
 				},
 			},
-			Action: func(c *cli.Context) error {
-				return eachDesiredStateDo(c, func(state *state.HelmState, helm helmexec.Interface) []error {
-					args := args.GetArgs(c.String("args"), state)
-					if len(args) > 0 {
-						helm.SetExtraArgs(args...)
-					}
-					if c.GlobalString("helm-binary") != "" {
-						helm.SetHelmBinary(c.GlobalString("helm-binary"))
-					}
-
-					return state.SyncRepos(helm)
-				})
-			},
+			Action: action(func(run *app.App, c configImpl) error {
+				return run.Repos(c)
+			}),
 		},
 		{
 			Name:  "charts",
-			Usage: "sync releases from state file (helm upgrade --install)",
+			Usage: "DEPRECATED: sync releases from state file (helm upgrade --install)",
 			Flags: []cli.Flag{
 				cli.StringFlag{
 					Name:  "args",
 					Value: "",
 					Usage: "pass args to helm exec",
 				},
+				cli.StringSliceFlag{
+					Name:  "set",
+					Usage: "additional values to be merged into the command",
+				},
 				cli.StringSliceFlag{
 					Name:  "values",
 					Usage: "additional value files to be merged into the command",
@@ -136,22 +161,9 @@ func main() {
 					Usage: "maximum number of concurrent helm processes to run, 0 is unlimited",
 				},
 			},
-			Action: func(c *cli.Context) error {
-				return eachDesiredStateDo(c, func(state *state.HelmState, helm helmexec.Interface) []error {
-					args := args.GetArgs(c.String("args"), state)
-					if len(args) > 0 {
-						helm.SetExtraArgs(args...)
-					}
-					if c.GlobalString("helm-binary") != "" {
-						helm.SetHelmBinary(c.GlobalString("helm-binary"))
-					}
-
-					values := c.StringSlice("values")
-					workers := c.Int("concurrency")
-
-					return state.SyncReleases(helm, values, workers)
-				})
-			},
+			Action: action(func(run *app.App, c configImpl) error {
+				return run.DeprecatedSyncCharts(c)
+			}),
 		},
 		{
 			Name:  "diff",
@@ -162,47 +174,75 @@ func main() {
 					Value: "",
 					Usage: "pass args to helm exec",
 				},
+				cli.StringSliceFlag{
+					Name:  "set",
+					Usage: "additional values to be merged into the command",
+				},
 				cli.StringSliceFlag{
 					Name:  "values",
 					Usage: "additional value files to be merged into the command",
 				},
 				cli.BoolFlag{
-					Name:  "sync-repos",
-					Usage: "enable a repo sync prior to diffing",
+					Name:  "skip-deps",
+					Usage: "skip running `helm repo update` and `helm dependency build`",
 				},
 				cli.BoolFlag{
 					Name:  "detailed-exitcode",
 					Usage: "return a non-zero exit code when there are changes",
 				},
+				cli.BoolFlag{
+					Name:  "suppress-secrets",
+					Usage: "suppress secrets in the output. highly recommended to specify on CI/CD use-cases",
+				},
 				cli.IntFlag{
 					Name:  "concurrency",
 					Value: 0,
 					Usage: "maximum number of concurrent helm processes to run, 0 is unlimited",
 				},
+				cli.IntFlag{
+					Name:  "context",
+					Value: 0,
+					Usage: "output NUM lines of context around changes",
+				},
 			},
-			Action: func(c *cli.Context) error {
-				return eachDesiredStateDo(c, func(state *state.HelmState, helm helmexec.Interface) []error {
-					args := args.GetArgs(c.String("args"), state)
-					if len(args) > 0 {
-						helm.SetExtraArgs(args...)
-					}
-					if c.GlobalString("helm-binary") != "" {
-						helm.SetHelmBinary(c.GlobalString("helm-binary"))
-					}
-
-					if c.Bool("sync-repos") {
-						if errs := state.SyncRepos(helm); errs != nil && len(errs) > 0 {
-							return errs
-						}
-					}
-
-					values := c.StringSlice("values")
-					workers := c.Int("concurrency")
-					detailedExitCode := c.Bool("detailed-exitcode")
-
-					return state.DiffReleases(helm, values, workers, detailedExitCode)
-				})
+			Action: action(func(run *app.App, c configImpl) error {
+				return run.Diff(c)
+			}),
+		},
+		{
+			Name:  "template",
+			Usage: "template releases from state file against env (helm template)",
+			Flags: []cli.Flag{
+				cli.StringFlag{
+					Name:  "args",
+					Value: "",
+					Usage: "pass args to helm template",
+				},
+				cli.StringSliceFlag{
+					Name:  "set",
+					Usage: "additional values to be merged into the command",
+				},
+				cli.StringSliceFlag{
+					Name:  "values",
+					Usage: "additional value files to be merged into the command",
+				},
+				cli.StringFlag{
+					Name:  "output-dir",
+					Usage: "output directory to pass to helm template (helm template --output-dir)",
+				},
+				cli.IntFlag{
+					Name:  "concurrency",
+					Value: 0,
+					Usage: "maximum number of concurrent downloads of release charts",
+				},
+				cli.BoolFlag{
+					Name:  "skip-deps",
+					Usage: "skip running `helm repo update` and `helm dependency build`",
+				},
 			},
+			Action: action(func(run *app.App, c configImpl) error {
+				return run.Template(c)
+			}),
 		},
 		{
 			Name:  "lint",
@@ -213,6 +253,10 @@ func main() {
 					Value: "",
 					Usage: "pass args to helm exec",
 				},
+				cli.StringSliceFlag{
+					Name:  "set",
+					Usage: "additional values to be merged into the command",
+				},
 				cli.StringSliceFlag{
 					Name:  "values",
 					Usage: "additional value files to be merged into the command",
@@ -220,30 +264,25 @@ func main() {
 				cli.IntFlag{
 					Name:  "concurrency",
 					Value: 0,
-					Usage: "maximum number of concurrent helm processes to run, 0 is unlimited",
+					Usage: "maximum number of concurrent downloads of release charts",
+				},
+				cli.BoolFlag{
+					Name:  "skip-deps",
+					Usage: "skip running `helm repo update` and `helm dependency build`",
 				},
 			},
-			Action: func(c *cli.Context) error {
-				return eachDesiredStateDo(c, func(state *state.HelmState, helm helmexec.Interface) []error {
-					args := args.GetArgs(c.String("args"), state)
-					if len(args) > 0 {
-						helm.SetExtraArgs(args...)
-					}
-					if c.GlobalString("helm-binary") != "" {
-						helm.SetHelmBinary(c.GlobalString("helm-binary"))
-					}
-
-					values := c.StringSlice("values")
-					workers := c.Int("concurrency")
-
-					return state.LintReleases(helm, values, workers)
-				})
-			},
+			Action: action(func(run *app.App, c configImpl) error {
+				return run.Lint(c)
+			}),
 		},
 		{
 			Name:  "sync",
 			Usage: "sync all resources from state file (repos, releases and chart deps)",
 			Flags: []cli.Flag{
+				cli.StringSliceFlag{
+					Name:  "set",
+					Usage: "additional values to be merged into the command",
+				},
 				cli.StringSliceFlag{
 					Name:  "values",
 					Usage: "additional value files to be merged into the command",
@@ -258,31 +297,54 @@ func main() {
 					Value: "",
 					Usage: "pass args to helm exec",
 				},
+				cli.BoolFlag{
+					Name:  "skip-deps",
+					Usage: "skip running `helm repo update` and `helm dependency build`",
+				},
 			},
-			Action: func(c *cli.Context) error {
-				return eachDesiredStateDo(c, func(state *state.HelmState, helm helmexec.Interface) []error {
-					if errs := state.SyncRepos(helm); errs != nil && len(errs) > 0 {
-						return errs
-					}
-
-					if errs := state.UpdateDeps(helm); errs != nil && len(errs) > 0 {
-						return errs
-					}
-
-					args := args.GetArgs(c.String("args"), state)
-					if len(args) > 0 {
-						helm.SetExtraArgs(args...)
-					}
-					if c.GlobalString("helm-binary") != "" {
-						helm.SetHelmBinary(c.GlobalString("helm-binary"))
-					}
-
-					values := c.StringSlice("values")
-					workers := c.Int("concurrency")
-
-					return state.SyncReleases(helm, values, workers)
-				})
+			Action: action(func(run *app.App, c configImpl) error {
+				return run.Sync(c)
+			}),
+		},
+		{
+			Name:  "apply",
+			Usage: "apply all resources from state file only when there are changes",
+			Flags: []cli.Flag{
+				cli.StringSliceFlag{
+					Name:  "set",
+					Usage: "additional values to be merged into the command",
+				},
+				cli.StringSliceFlag{
+					Name:  "values",
+					Usage: "additional value files to be merged into the command",
+				},
+				cli.IntFlag{
+					Name:  "concurrency",
+					Value: 0,
+					Usage: "maximum number of concurrent helm processes to run, 0 is unlimited",
+				},
+				cli.IntFlag{
+					Name:  "context",
+					Value: 0,
+					Usage: "output NUM lines of context around changes",
+				},
+				cli.StringFlag{
+					Name:  "args",
+					Value: "",
+					Usage: "pass args to helm exec",
+				},
+				cli.BoolFlag{
+					Name:  "suppress-secrets",
+					Usage: "suppress secrets in the diff output. highly recommended to specify on CI/CD use-cases",
+				},
+				cli.BoolFlag{
+					Name:  "skip-deps",
+					Usage: "skip running `helm repo update` and `helm dependency build`",
+				},
 			},
+			Action: action(func(run *app.App, c configImpl) error {
+				return run.Apply(c)
+			}),
 		},
 		{
 			Name:  "status",
@@ -299,26 +361,19 @@ func main() {
 					Usage: "pass args to helm exec",
 				},
 			},
-			Action: func(c *cli.Context) error {
-				return eachDesiredStateDo(c, func(state *state.HelmState, helm helmexec.Interface) []error {
-					workers := c.Int("concurrency")
-
-					args := args.GetArgs(c.String("args"), state)
-					if len(args) > 0 {
-						helm.SetExtraArgs(args...)
-					}
-					if c.GlobalString("helm-binary") != "" {
-						helm.SetHelmBinary(c.GlobalString("helm-binary"))
-					}
-
-					return state.ReleaseStatuses(helm, workers)
-				})
-			},
+			Action: action(func(run *app.App, c configImpl) error {
+				return run.Status(c)
+			}),
 		},
 		{
 			Name:  "delete",
-			Usage: "delete releases from state file (helm delete)",
+			Usage: "DEPRECATED: delete releases from state file (helm delete)",
 			Flags: []cli.Flag{
+				cli.IntFlag{
+					Name:  "concurrency",
+					Value: 0,
+					Usage: "maximum number of concurrent helm processes to run, 0 is unlimited",
+				},
 				cli.StringFlag{
 					Name:  "args",
 					Value: "",
@@ -329,22 +384,28 @@ func main() {
 					Usage: "purge releases i.e. free release names and histories",
 				},
 			},
-			Action: func(c *cli.Context) error {
-				return eachDesiredStateDo(c, func(state *state.HelmState, helm helmexec.Interface) []error {
-					purge := c.Bool("purge")
-
-					args := args.GetArgs(c.String("args"), state)
-					if len(args) > 0 {
-						helm.SetExtraArgs(args...)
-					}
-
-					if c.GlobalString("helm-binary") != "" {
-						helm.SetHelmBinary(c.GlobalString("helm-binary"))
-					}
-
-					return state.DeleteReleases(helm, purge)
-				})
+			Action: action(func(run *app.App, c configImpl) error {
+				return run.Delete(c)
+			}),
+		},
+		{
+			Name:  "destroy",
+			Usage: "deletes and then purges releases",
+			Flags: []cli.Flag{
+				cli.IntFlag{
+					Name:  "concurrency",
+					Value: 0,
+					Usage: "maximum number of concurrent helm processes to run, 0 is unlimited",
+				},
+				cli.StringFlag{
+					Name:  "args",
+					Value: "",
+					Usage: "pass args to helm exec",
+				},
 			},
+			Action: action(func(run *app.App, c configImpl) error {
+				return run.Destroy(c)
+			}),
 		},
 		{
 			Name:  "test",
@@ -364,208 +425,219 @@ func main() {
 					Value: 300,
 					Usage: "maximum time for tests to run before being considered failed",
 				},
+				cli.IntFlag{
+					Name:  "concurrency",
+					Value: 0,
+					Usage: "maximum number of concurrent helm processes to run, 0 is unlimited",
+				},
 			},
-			Action: func(c *cli.Context) error {
-				return eachDesiredStateDo(c, func(state *state.HelmState, helm helmexec.Interface) []error {
-					cleanup := c.Bool("cleanup")
-					timeout := c.Int("timeout")
-
-					args := args.GetArgs(c.String("args"), state)
-					if len(args) > 0 {
-						helm.SetExtraArgs(args...)
-					}
-					if c.GlobalString("helm-binary") != "" {
-						helm.SetHelmBinary(c.GlobalString("helm-binary"))
-					}
-
-					return state.TestReleases(helm, cleanup, timeout)
-				})
-			},
+			Action: action(func(run *app.App, c configImpl) error {
+				return run.Test(c)
+			}),
+		},
+		{
+			Name:  "build",
+			Usage: "output compiled helmfile state(s) as YAML",
+			Flags: []cli.Flag{},
+			Action: action(func(run *app.App, c configImpl) error {
+				return run.PrintState(c)
+			}),
+		},
+		{
+			Name:  "list",
+			Usage: "list releases defined in state file",
+			Flags: []cli.Flag{},
+			Action: action(func(run *app.App, c configImpl) error {
+				return run.ListReleases(c)
+			}),
 		},
 	}

-	err := app.Run(os.Args)
+	err := cliApp.Run(os.Args)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "%v\n", err)
 		os.Exit(3)
 	}
 }

-func eachDesiredStateDo(c *cli.Context, converge func(*state.HelmState, helmexec.Interface) []error) error {
-	fileOrDirPath := c.GlobalString("file")
-	desiredStateFiles, err := findDesiredStateFiles(fileOrDirPath)
-	if err != nil {
-		return err
-	}
-	allSelectorNotMatched := true
-	for _, f := range desiredStateFiles {
-		yamlBuf, err := state.RenderTemplateFileToBuffer(f)
-		if err != nil {
-			return err
-		}
-		state, helm, noReleases, err := loadDesiredStateFromFile(
-			yamlBuf.Bytes(),
-			f,
-			c.GlobalString("kube-context"),
-			c.GlobalString("namespace"),
-			c.GlobalStringSlice("selector"),
-			c.App.Metadata["logger"].(*zap.SugaredLogger),
-		)
-		if err != nil {
-			return err
-		}
-		allSelectorNotMatched = allSelectorNotMatched && noReleases
-		if noReleases {
-			continue
-		}
-		errs := converge(state, helm)
-		if err := clean(state, errs); err != nil {
-			return err
-		}
-	}
-	if allSelectorNotMatched {
-		logger.Error("specified selector did not match any releases in any helmfile")
-		os.Exit(2)
-	}
-	return nil
+type configImpl struct {
+	c *cli.Context
+
+	set map[string]interface{}
 }

-func findDesiredStateFiles(specifiedPath string) ([]string, error) {
-	var helmfileDir string
-	if specifiedPath != "" {
-		if fileExistsAt(specifiedPath) {
-			return []string{specifiedPath}, nil
-		} else if directoryExistsAt(specifiedPath) {
-			helmfileDir = specifiedPath
-		} else {
-			return []string{}, fmt.Errorf("specified state file %s is not found", specifiedPath)
-		}
-	} else {
-		var defaultFile string
-		if fileExistsAt(DefaultHelmfile) {
-			defaultFile = DefaultHelmfile
-		} else if fileExistsAt(DeprecatedHelmfile) {
-			log.Printf(
-				"warn: %s is being loaded: %s is deprecated in favor of %s. See https://github.com/roboll/helmfile/issues/25 for more information",
-				DeprecatedHelmfile,
-				DeprecatedHelmfile,
-				DefaultHelmfile,
-			)
-			defaultFile = DeprecatedHelmfile
-		}
-
-		if directoryExistsAt(DefaultHelmfileDirectory) {
-			if defaultFile != "" {
-				return []string{}, fmt.Errorf("configuration conlict error: you can have either %s or %s, but not both", defaultFile, DefaultHelmfileDirectory)
-			}
-
-			helmfileDir = DefaultHelmfileDirectory
-		} else if defaultFile != "" {
-			return []string{defaultFile}, nil
-		} else {
-			return []string{}, fmt.Errorf("no state file found. It must be named %s/*.yaml, %s, or %s, or otherwise specified with the --file flag", DefaultHelmfileDirectory, DefaultHelmfile, DeprecatedHelmfile)
-		}
+func NewUrfaveCliConfigImpl(c *cli.Context) (configImpl, error) {
+	if c.NArg() > 0 {
+		cli.ShowAppHelp(c)
+		return configImpl{}, fmt.Errorf("err: extraneous arguments: %s", strings.Join(c.Args(), ", "))
 	}

-	files, err := filepath.Glob(filepath.Join(helmfileDir, "*.yaml"))
-	if err != nil {
-		return []string{}, err
-	}
-	sort.Slice(files, func(i, j int) bool {
-		return files[i] < files[j]
-	})
-	return files, nil
-}
-
-func fileExistsAt(path string) bool {
-	fileInfo, err := os.Stat(path)
-	return err == nil && fileInfo.Mode().IsRegular()
-}
-
-func directoryExistsAt(path string) bool {
-	fileInfo, err := os.Stat(path)
-	return err == nil && fileInfo.Mode().IsDir()
-}
-
-func loadDesiredStateFromFile(yaml []byte, file string, kubeContext, namespace string, labels []string, logger *zap.SugaredLogger) (*state.HelmState, helmexec.Interface, bool, error) {
-	st, err := state.CreateFromYaml(yaml, file, logger)
-	if err != nil {
-		return nil, nil, false, fmt.Errorf("failed to read %s: %v", file, err)
+	conf := configImpl{
+		c: c,
 	}

-	if st.Context != "" {
-		if kubeContext != "" {
-			log.Printf("err: Cannot use option --kube-context and set attribute context.")
-			os.Exit(1)
-		}
+	optsSet := c.GlobalStringSlice("state-values-set")
+	if len(optsSet) > 0 {
+		set := map[string]interface{}{}
+		for i := range optsSet {
+			ops := strings.Split(optsSet[i], ",")
+			for j := range ops {
+				op := strings.SplitN(ops[j], "=", 2)
+				k := strings.Split(op[0], ".")
+				v := op[1]

-		kubeContext = st.Context
-	}
-	if namespace != "" {
-		if st.Namespace != "" {
-			log.Printf("err: Cannot use option --namespace and set attribute namespace.")
-			os.Exit(1)
-		}
-		st.Namespace = namespace
-	}
-
-	if len(labels) > 0 {
-		err = st.FilterReleases(labels)
-		if err != nil {
-			log.Print(err)
-			return nil, nil, true, nil
-		}
-	}
-
-	releaseNameCounts := map[string]int{}
-	for _, r := range st.Releases {
-		releaseNameCounts[r.Name] += 1
-	}
-	for name, c := range releaseNameCounts {
-		if c > 1 {
-			return nil, nil, false, fmt.Errorf("duplicate release \"%s\" found: there were %d releases named \"%s\" matching specified selector", name, c, name)
-		}
-	}
-
-	sigs := make(chan os.Signal, 1)
-	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
-	go func() {
-		sig := <-sigs
-
-		errs := []error{fmt.Errorf("Received [%s] to shutdown ", sig)}
-		clean(st, errs)
-	}()
-
-	return st, helmexec.New(logger, kubeContext), len(st.Releases) == 0, nil
-}
-
-func clean(st *state.HelmState, errs []error) error {
-	if errs == nil {
-		errs = []error{}
-	}
-
-	cleanErrs := st.Clean()
-	if cleanErrs != nil {
-		errs = append(errs, cleanErrs...)
-	}
-
-	if errs != nil && len(errs) > 0 {
-		for _, err := range errs {
-			switch e := err.(type) {
-			case *state.ReleaseError:
-				fmt.Printf("err: release \"%s\" in \"%s\" failed: %v\n", e.Name, st.FilePath, e)
-			default:
-				fmt.Printf("err: %v\n", e)
+				set = maputil.Set(set, k, v)
 			}
 		}
-		switch e := errs[0].(type) {
-		case *exec.ExitError:
-			// Propagate any non-zero exit status from the external command like `helm` that is failed under the hood
-			status := e.Sys().(syscall.WaitStatus)
-			os.Exit(status.ExitStatus())
+		conf.set = set
+	}
+
+	return conf, nil
+}
+
+func (c configImpl) Set() []string {
+	return c.c.StringSlice("set")
+}
+
+func (c configImpl) SkipRepos() bool {
+	return c.c.Bool("skip-repos")
+}
+
+func (c configImpl) Values() []string {
+	return c.c.StringSlice("values")
+}
+
+func (c configImpl) Args() string {
+	return c.c.String("args")
+}
+
+func (c configImpl) OutputDir() string {
+	return c.c.String("output-dir")
+}
+
+func (c configImpl) Concurrency() int {
+	return c.c.Int("concurrency")
+}
+
+func (c configImpl) HasCommandName(name string) bool {
+	return c.c.Command.HasName(name)
+}
+
+// DiffConfig
+
+func (c configImpl) SkipDeps() bool {
+	return c.c.Bool("skip-deps")
+}
+
+func (c configImpl) DetailedExitcode() bool {
+	return c.c.Bool("detailed-exitcode")
+}
+
+func (c configImpl) SuppressSecrets() bool {
+	return c.c.Bool("suppress-secrets")
+}
+
+// DeleteConfig
+
+func (c configImpl) Purge() bool {
+	return c.c.Bool("purge")
+}
+
+// TestConfig
+
+func (c configImpl) Cleanup() bool {
+	return c.c.Bool("cleanup")
+}
+
+func (c configImpl) Timeout() int {
+	return c.c.Int("timeout")
+}
+
+// GlobalConfig
+
+func (c configImpl) HelmBinary() string {
+	return c.c.GlobalString("helm-binary")
+}
+
+func (c configImpl) KubeContext() string {
+	return c.c.GlobalString("kube-context")
+}
+
+func (c configImpl) Namespace() string {
+	return c.c.GlobalString("namespace")
+}
+
+func (c configImpl) FileOrDir() string {
+	return c.c.GlobalString("file")
+}
+
+func (c configImpl) Selectors() []string {
+	return c.c.GlobalStringSlice("selector")
+}
+
+func (c configImpl) StateValuesSet() map[string]interface{} {
+	return c.set
+}
+
+func (c configImpl) StateValuesFiles() []string {
+	return c.c.GlobalStringSlice("state-values-file")
+}
+
+func (c configImpl) Interactive() bool {
+	return c.c.GlobalBool("interactive")
+}
+
+func (c configImpl) NoColor() bool {
+	return c.c.GlobalBool("no-color")
+}
+
+func (c configImpl) Context() int {
+	return c.c.Int("context")
+}
+
+func (c configImpl) Logger() *zap.SugaredLogger {
+	return c.c.App.Metadata["logger"].(*zap.SugaredLogger)
+}
+
+func (c configImpl) Env() string {
+	env := c.c.GlobalString("environment")
+	if env == "" {
+		env = state.DefaultEnv
+	}
+	return env
+}
+
+func action(do func(*app.App, configImpl) error) func(*cli.Context) error {
+	return func(implCtx *cli.Context) error {
+		conf, err := NewUrfaveCliConfigImpl(implCtx)
+		if err != nil {
+			return err
+		}
+
+		a := app.New(conf)
+
+		a.ErrorHandler = func(err error) error {
+			return toCliError(implCtx, err)
+		}
+
+		return do(a, conf)
+	}
+}
+
+func toCliError(c *cli.Context, err error) error {
+	if err != nil {
+		switch e := err.(type) {
+		case *app.NoMatchingHelmfileError:
+			noMatchingExitCode := 3
+			if c.GlobalBool("allow-no-matching-release") {
+				noMatchingExitCode = 0
+			}
+			return cli.NewExitError(e.Error(), noMatchingExitCode)
+		case *app.Error:
+			return cli.NewExitError(e.Error(), e.Code())
 		default:
-			os.Exit(1)
+			panic(fmt.Errorf("BUG: please file an github issue for this unhandled error: %T: %v", e, e))
 		}
 	}
-	return nil
+	return err
 }
@@ -1,26 +0,0 @@
-package main
-
-import "testing"
-
-// See https://github.com/roboll/helmfile/issues/193
-func TestReadFromYaml_DuplicateReleaseName(t *testing.T) {
-	yamlFile := "example/path/to/yaml/file"
-	yamlContent := []byte(`releases:
- name: myrelease1
-  chart: mychart1
-  labels:
-    stage: pre
-    foo: bar
- name: myrelease1
-  chart: mychart2
-  labels:
-    stage: post
-`)
-	_, _, _, err := loadDesiredStateFromFile(yamlContent, yamlFile, "default", "default", []string{}, logger)
-	if err == nil {
-		t.Error("error expected but not happened")
-	}
-	if err.Error() != "duplicate release \"myrelease1\" found: there were 2 releases named \"myrelease1\" matching specified selector" {
-		t.Errorf("unexpected error happened: %v", err)
-	}
-}
@@ -0,0 +1,669 @@
+package app
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/signal"
+	"strings"
+	"syscall"
+
+	"github.com/gosuri/uitable"
+	"github.com/roboll/helmfile/pkg/helmexec"
+	"github.com/roboll/helmfile/pkg/remote"
+	"github.com/roboll/helmfile/pkg/state"
+
+	"go.uber.org/zap"
+
+	"path/filepath"
+	"sort"
+)
+
+type App struct {
+	KubeContext string
+	Logger      *zap.SugaredLogger
+	Reverse     bool
+	Env         string
+	Namespace   string
+	Selectors   []string
+	HelmBinary  string
+	Args        string
+	ValuesFiles []string
+	Set         map[string]interface{}
+
+	FileOrDir string
+
+	ErrorHandler func(error) error
+
+	readFile          func(string) ([]byte, error)
+	fileExists        func(string) (bool, error)
+	glob              func(string) ([]string, error)
+	abs               func(string) (string, error)
+	fileExistsAt      func(string) bool
+	directoryExistsAt func(string) bool
+
+	getwd func() (string, error)
+	chdir func(string) error
+
+	remote *remote.Remote
+
+	helmExecer helmexec.Interface
+}
+
+func New(conf ConfigProvider) *App {
+	return Init(&App{
+		KubeContext: conf.KubeContext(),
+		Logger:      conf.Logger(),
+		Env:         conf.Env(),
+		Namespace:   conf.Namespace(),
+		Selectors:   conf.Selectors(),
+		HelmBinary:  conf.HelmBinary(),
+		Args:        conf.Args(),
+		FileOrDir:   conf.FileOrDir(),
+		ValuesFiles: conf.StateValuesFiles(),
+		Set:         conf.StateValuesSet(),
+		helmExecer: helmexec.New(conf.Logger(), conf.KubeContext(), &helmexec.ShellRunner{
+			Logger: conf.Logger(),
+		}),
+	})
+}
+
+func Init(app *App) *App {
+	app.readFile = ioutil.ReadFile
+	app.glob = filepath.Glob
+	app.abs = filepath.Abs
+	app.getwd = os.Getwd
+	app.chdir = os.Chdir
+	app.fileExistsAt = fileExistsAt
+	app.fileExists = fileExists
+	app.directoryExistsAt = directoryExistsAt
+	return app
+}
+
+func (a *App) Deps(c DepsConfigProvider) error {
+	return a.ForEachState(func(run *Run) []error {
+		return run.Deps(c)
+	})
+}
+
+func (a *App) Repos(c ReposConfigProvider) error {
+	return a.ForEachState(func(run *Run) []error {
+		return run.Repos(c)
+	})
+}
+
+func (a *App) reverse() *App {
+	new := *a
+	new.Reverse = true
+	return &new
+}
+
+func (a *App) DeprecatedSyncCharts(c DeprecatedChartsConfigProvider) error {
+	return a.ForEachState(func(run *Run) []error {
+		return run.DeprecatedSyncCharts(c)
+	})
+}
+
+func (a *App) Diff(c DiffConfigProvider) error {
+	return a.ForEachState(func(run *Run) []error {
+		return run.Diff(c)
+	})
+}
+
+func (a *App) Template(c TemplateConfigProvider) error {
+	return a.ForEachState(func(run *Run) []error {
+		return run.Template(c)
+	})
+}
+
+func (a *App) Lint(c LintConfigProvider) error {
+	return a.ForEachState(func(run *Run) []error {
+		return run.Lint(c)
+	})
+}
+
+func (a *App) Sync(c SyncConfigProvider) error {
+	return a.ForEachState(func(run *Run) []error {
+		return run.Sync(c)
+	})
+}
+
+func (a *App) Apply(c ApplyConfigProvider) error {
+	return a.ForEachState(func(run *Run) []error {
+		return run.Apply(c)
+	})
+}
+
+func (a *App) Status(c StatusesConfigProvider) error {
+	return a.ForEachState(func(run *Run) []error {
+		return run.Status(c)
+	})
+}
+
+func (a *App) Delete(c DeleteConfigProvider) error {
+	return a.reverse().ForEachState(func(run *Run) []error {
+		return run.Delete(c)
+	})
+}
+
+func (a *App) Destroy(c DestroyConfigProvider) error {
+	return a.reverse().ForEachState(func(run *Run) []error {
+		return run.Destroy(c)
+	})
+}
+
+func (a *App) Test(c TestConfigProvider) error {
+	return a.ForEachState(func(run *Run) []error {
+		return run.Test(c)
+	})
+}
+
+func (a *App) PrintState(c StateConfigProvider) error {
+
+	return a.ForEachState(func(run *Run) []error {
+		state, err := run.state.ToYaml()
+		if err != nil {
+			return []error{err}
+		}
+		fmt.Printf("---\n#  Source: %s\n\n%+v", run.state.FilePath, state)
+		return []error{}
+	})
+}
+
+func (a *App) ListReleases(c StateConfigProvider) error {
+	table := uitable.New()
+	table.AddRow("NAME", "NAMESPACE", "INSTALLED", "LABELS")
+
+	err := a.ForEachState(func(run *Run) []error {
+		//var releases m
+		for _, r := range run.state.Releases {
+			labels := ""
+			for k, v := range r.Labels {
+				labels = fmt.Sprintf("%s,%s:%s", labels, k, v)
+			}
+			installed := r.Installed == nil || *r.Installed
+			table.AddRow(r.Name, r.Namespace, fmt.Sprintf("%t", installed), strings.Trim(labels, ","))
+		}
+		return []error{}
+	})
+	fmt.Println(table.String())
+	return err
+}
+
+func (a *App) within(dir string, do func() error) error {
+	if dir == "." {
+		return do()
+	}
+
+	prev, err := a.getwd()
+	if err != nil {
+		return fmt.Errorf("failed getting current working direcotyr: %v", err)
+	}
+
+	absDir, err := a.abs(dir)
+	if err != nil {
+		return err
+	}
+
+	a.Logger.Debugf("changing working directory to \"%s\"", absDir)
+
+	if err := a.chdir(absDir); err != nil {
+		return fmt.Errorf("failed changing working directory to \"%s\": %v", absDir, err)
+	}
+
+	appErr := do()
+
+	a.Logger.Debugf("changing working directory back to \"%s\"", prev)
+
+	if chdirBackErr := a.chdir(prev); chdirBackErr != nil {
+		if appErr != nil {
+			a.Logger.Warnf("%v", appErr)
+		}
+		return fmt.Errorf("failed chaging working directory back to \"%s\": %v", prev, chdirBackErr)
+	}
+
+	return appErr
+}
+
+func (a *App) visitStateFiles(fileOrDir string, do func(string, string) error) error {
+	desiredStateFiles, err := a.findDesiredStateFiles(fileOrDir)
+	if err != nil {
+		return appError("", err)
+	}
+
+	for _, relPath := range desiredStateFiles {
+		var file string
+		var dir string
+		if a.directoryExistsAt(relPath) {
+			file = relPath
+			dir = relPath
+		} else {
+			file = filepath.Base(relPath)
+			dir = filepath.Dir(relPath)
+		}
+
+		a.Logger.Debugf("processing file \"%s\" in directory \"%s\"", file, dir)
+
+		err := a.within(dir, func() error {
+			absd, err := a.abs(dir)
+			if err != nil {
+				return err
+			}
+
+			return do(file, absd)
+		})
+		if err != nil {
+			return appError(fmt.Sprintf("in %s/%s", dir, file), err)
+		}
+	}
+
+	return nil
+}
+
+func (a *App) loadDesiredStateFromYaml(file string, opts ...LoadOpts) (*state.HelmState, error) {
+	ld := &desiredStateLoader{
+		readFile:   a.readFile,
+		fileExists: a.fileExists,
+		env:        a.Env,
+		namespace:  a.Namespace,
+		logger:     a.Logger,
+		abs:        a.abs,
+
+		Reverse:     a.Reverse,
+		KubeContext: a.KubeContext,
+		glob:        a.glob,
+		helm:        a.helmExecer,
+	}
+
+	var op LoadOpts
+	if len(opts) > 0 {
+		op = opts[0]
+	}
+
+	return ld.Load(file, op)
+}
+
+func (a *App) visitStates(fileOrDir string, defOpts LoadOpts, converge func(*state.HelmState, helmexec.Interface) (bool, []error)) error {
+	noMatchInHelmfiles := true
+
+	err := a.visitStateFiles(fileOrDir, func(f, d string) error {
+		opts := defOpts.DeepCopy()
+
+		if opts.CalleePath == "" {
+			opts.CalleePath = f
+		}
+
+		st, err := a.loadDesiredStateFromYaml(f, opts)
+
+		sigs := make(chan os.Signal, 1)
+		signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
+		go func() {
+			sig := <-sigs
+
+			errs := []error{fmt.Errorf("Received [%s] to shutdown ", sig)}
+			_ = context{a, st}.clean(errs)
+			// See http://tldp.org/LDP/abs/html/exitcodes.html
+			switch sig {
+			case syscall.SIGINT:
+				os.Exit(130)
+			case syscall.SIGTERM:
+				os.Exit(143)
+			}
+		}()
+
+		ctx := context{a, st}
+
+		helm := a.helmExecer
+
+		if err != nil {
+			switch stateLoadErr := err.(type) {
+			// Addresses https://github.com/roboll/helmfile/issues/279
+			case *state.StateLoadError:
+				switch stateLoadErr.Cause.(type) {
+				case *state.UndefinedEnvError:
+					return nil
+				default:
+					return ctx.wrapErrs(err)
+				}
+			default:
+				return ctx.wrapErrs(err)
+			}
+		}
+		st.Selectors = opts.Selectors
+
+		if len(st.Helmfiles) > 0 {
+			noMatchInSubHelmfiles := true
+			for i, m := range st.Helmfiles {
+				optsForNestedState := LoadOpts{
+					CalleePath:  filepath.Join(d, f),
+					Environment: m.Environment,
+				}
+				//assign parent selector to sub helm selector in legacy mode or do not inherit in experimental mode
+				if (m.Selectors == nil && !isExplicitSelectorInheritanceEnabled()) || m.SelectorsInherited {
+					optsForNestedState.Selectors = opts.Selectors
+				} else {
+					optsForNestedState.Selectors = m.Selectors
+				}
+
+				if err := a.visitStates(m.Path, optsForNestedState, converge); err != nil {
+					switch err.(type) {
+					case *NoMatchingHelmfileError:
+
+					default:
+						return appError(fmt.Sprintf("in .helmfiles[%d]", i), err)
+					}
+				} else {
+					noMatchInSubHelmfiles = false
+				}
+			}
+			noMatchInHelmfiles = noMatchInHelmfiles && noMatchInSubHelmfiles
+		}
+
+		templated, tmplErr := st.ExecuteTemplates()
+		if tmplErr != nil {
+			return appError(fmt.Sprintf("failed executing release templates in \"%s\"", f), tmplErr)
+		}
+		processed, errs := converge(templated, helm)
+		noMatchInHelmfiles = noMatchInHelmfiles && !processed
+		return context{a, templated}.clean(errs)
+	})
+
+	if err != nil {
+		return err
+	}
+
+	if noMatchInHelmfiles {
+		return &NoMatchingHelmfileError{selectors: a.Selectors, env: a.Env}
+	}
+
+	return nil
+}
+
+func (a *App) ForEachState(do func(*Run) []error) error {
+	ctx := NewContext()
+	err := a.VisitDesiredStatesWithReleasesFiltered(a.FileOrDir, func(st *state.HelmState, helm helmexec.Interface) []error {
+		run := NewRun(st, helm, ctx)
+
+		return do(run)
+	})
+
+	if err != nil && a.ErrorHandler != nil {
+		return a.ErrorHandler(err)
+	}
+
+	return err
+}
+
+func (a *App) VisitDesiredStatesWithReleasesFiltered(fileOrDir string, converge func(*state.HelmState, helmexec.Interface) []error) error {
+	opts := LoadOpts{
+		Selectors: a.Selectors,
+	}
+
+	envvals := []interface{}{}
+
+	if a.ValuesFiles != nil {
+		for i := range a.ValuesFiles {
+			envvals = append(envvals, a.ValuesFiles[i])
+		}
+	}
+
+	if a.Set != nil {
+		envvals = append(envvals, a.Set)
+	}
+
+	if len(envvals) > 0 {
+		opts.Environment.OverrideValues = envvals
+	}
+
+	dir, err := a.getwd()
+	if err != nil {
+		return err
+	}
+
+	getter := &remote.GoGetter{Logger: a.Logger}
+
+	remote := &remote.Remote{
+		Logger:     a.Logger,
+		Home:       dir,
+		Getter:     getter,
+		ReadFile:   a.readFile,
+		DirExists:  a.directoryExistsAt,
+		FileExists: a.fileExistsAt,
+	}
+
+	a.remote = remote
+
+	return a.visitStates(fileOrDir, opts, func(st *state.HelmState, helm helmexec.Interface) (bool, []error) {
+		if len(st.Selectors) > 0 {
+			err := st.FilterReleases()
+			if err != nil {
+				return false, []error{err}
+			}
+		}
+
+		if a.HelmBinary != "" {
+			helm.SetHelmBinary(a.HelmBinary)
+		}
+
+		type Key struct {
+			TillerNamespace, Name string
+		}
+
+		releaseNameCounts := map[Key]int{}
+		for _, r := range st.Releases {
+			tillerNamespace := st.HelmDefaults.TillerNamespace
+			if r.TillerNamespace != "" {
+				tillerNamespace = r.TillerNamespace
+			}
+			releaseNameCounts[Key{tillerNamespace, r.Name}]++
+		}
+		for name, c := range releaseNameCounts {
+			if c > 1 {
+				return false, []error{fmt.Errorf("duplicate release \"%s\" found in \"%s\": there were %d releases named \"%s\" matching specified selector", name.Name, name.TillerNamespace, c, name.Name)}
+			}
+		}
+
+		errs := converge(st, helm)
+
+		processed := len(st.Releases) != 0 && len(errs) == 0
+
+		return processed, errs
+	})
+}
+
+func (a *App) findStateFilesInAbsPaths(specifiedPath string) ([]string, error) {
+	rels, err := a.findDesiredStateFiles(specifiedPath)
+	if err != nil {
+		return rels, err
+	}
+
+	files := make([]string, len(rels))
+	for i := range rels {
+		files[i], err = filepath.Abs(rels[i])
+		if err != nil {
+			return []string{}, err
+		}
+	}
+	return files, nil
+}
+
+func (a *App) findDesiredStateFiles(specifiedPath string) ([]string, error) {
+	path, err := a.remote.Locate(specifiedPath)
+	if err != nil {
+		return nil, fmt.Errorf("locate: %v", err)
+	}
+	if specifiedPath != path {
+		a.Logger.Debugf("fetched remote \"%s\" to local cache \"%s\" and loading the latter...", specifiedPath, path)
+	}
+	specifiedPath = path
+
+	var helmfileDir string
+	if specifiedPath != "" {
+		if a.fileExistsAt(specifiedPath) {
+			return []string{specifiedPath}, nil
+		} else if a.directoryExistsAt(specifiedPath) {
+			helmfileDir = specifiedPath
+		} else {
+			return []string{}, fmt.Errorf("specified state file %s is not found", specifiedPath)
+		}
+	} else {
+		var defaultFile string
+		if a.fileExistsAt(DefaultHelmfile) {
+			defaultFile = DefaultHelmfile
+		} else if a.fileExistsAt(DeprecatedHelmfile) {
+			log.Printf(
+				"warn: %s is being loaded: %s is deprecated in favor of %s. See https://github.com/roboll/helmfile/issues/25 for more information",
+				DeprecatedHelmfile,
+				DeprecatedHelmfile,
+				DefaultHelmfile,
+			)
+			defaultFile = DeprecatedHelmfile
+		}
+
+		if a.directoryExistsAt(DefaultHelmfileDirectory) {
+			if defaultFile != "" {
+				return []string{}, fmt.Errorf("configuration conlict error: you can have either %s or %s, but not both", defaultFile, DefaultHelmfileDirectory)
+			}
+
+			helmfileDir = DefaultHelmfileDirectory
+		} else if defaultFile != "" {
+			return []string{defaultFile}, nil
+		} else {
+			return []string{}, fmt.Errorf("no state file found. It must be named %s/*.{yaml,yml}, %s, or %s, or otherwise specified with the --file flag", DefaultHelmfileDirectory, DefaultHelmfile, DeprecatedHelmfile)
+		}
+	}
+
+	files, err := a.glob(filepath.Join(helmfileDir, "*.y*ml"))
+	if err != nil {
+		return []string{}, err
+	}
+	sort.Slice(files, func(i, j int) bool {
+		return files[i] < files[j]
+	})
+	return files, nil
+}
+
+func fileExistsAt(path string) bool {
+	fileInfo, err := os.Stat(path)
+	return err == nil && fileInfo.Mode().IsRegular()
+}
+
+func fileExists(path string) (bool, error) {
+	_, err := os.Stat(path)
+
+	if err != nil {
+		if os.IsNotExist(err) {
+			return false, nil
+		}
+		return false, err
+	}
+	return true, nil
+}
+
+func directoryExistsAt(path string) bool {
+	fileInfo, err := os.Stat(path)
+	return err == nil && fileInfo.Mode().IsDir()
+}
+
+type Error struct {
+	msg string
+
+	Errors []error
+}
+
+func (e *Error) Error() string {
+	var cause string
+	if e.Errors == nil {
+		return e.msg
+	}
+	if len(e.Errors) == 1 {
+		if e.Errors[0] == nil {
+			panic(fmt.Sprintf("[bug] assertion error: unexpected state: e.Errors: %v", e.Errors))
+		}
+		cause = e.Errors[0].Error()
+	} else {
+		msgs := []string{}
+		for i, err := range e.Errors {
+			if err == nil {
+				continue
+			}
+			msgs = append(msgs, fmt.Sprintf("err %d: %v", i, err.Error()))
+		}
+		cause = fmt.Sprintf("%d errors:\n%s", len(e.Errors), strings.Join(msgs, "\n"))
+	}
+	msg := ""
+	if e.msg != "" {
+		msg = fmt.Sprintf("%s: %s", e.msg, cause)
+	} else {
+		msg = cause
+	}
+	return msg
+}
+
+func (e *Error) Code() int {
+	allDiff := false
+	anyNonZero := false
+	for _, err := range e.Errors {
+		switch ee := err.(type) {
+		case *state.ReleaseError:
+			if anyNonZero {
+				allDiff = allDiff && ee.Code == 2
+			} else {
+				allDiff = ee.Code == 2
+			}
+		case *Error:
+			if anyNonZero {
+				allDiff = allDiff && ee.Code() == 2
+			} else {
+				allDiff = ee.Code() == 2
+			}
+		}
+		anyNonZero = true
+	}
+
+	if anyNonZero {
+		if allDiff {
+			return 2
+		}
+		return 1
+	}
+	panic(fmt.Sprintf("[bug] assertion error: unexpected state: unable to handle errors: %v", e.Errors))
+}
+
+func appError(msg string, err error) error {
+	return &Error{msg, []error{err}}
+}
+
+func (c context) clean(errs []error) error {
+	if errs == nil {
+		errs = []error{}
+	}
+
+	cleanErrs := c.st.Clean()
+	if cleanErrs != nil {
+		errs = append(errs, cleanErrs...)
+	}
+
+	return c.wrapErrs(errs...)
+}
+
+type context struct {
+	app *App
+	st  *state.HelmState
+}
+
+func (c context) wrapErrs(errs ...error) error {
+	if errs != nil && len(errs) > 0 {
+		for _, err := range errs {
+			switch e := err.(type) {
+			case *state.ReleaseError:
+				c.app.Logger.Debugf("err: release \"%s\" in \"%s\" failed: %v", e.Name, c.st.FilePath, e)
+			default:
+				c.app.Logger.Debugf("err: %v", e)
+			}
+		}
+		return &Error{Errors: errs}
+	}
+	return nil
+}
@@ -0,0 +1,33 @@
+package app
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+)
+
+// Copyright (c) 2017 Roland Singer [roland.singer@desertbit.com]
+//
+// Shamelessly borrowed from @r0l1's awesome work that is available at https://gist.github.com/r0l1/3dcbb0c8f6cfe9c66ab8008f55f8f28b
+func AskForConfirmation(s string) bool {
+	reader := bufio.NewReader(os.Stdin)
+
+	for {
+		fmt.Printf("%s [y/n]: ", s)
+
+		response, err := reader.ReadString('\n')
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		response = strings.ToLower(strings.TrimSpace(response))
+
+		if response == "y" || response == "yes" {
+			return true
+		} else if response == "n" || response == "no" {
+			return false
+		}
+	}
+}
@@ -0,0 +1,147 @@
+package app
+
+import "go.uber.org/zap"
+
+type ConfigProvider interface {
+	Args() string
+	HelmBinary() string
+
+	FileOrDir() string
+	KubeContext() string
+	Namespace() string
+	Selectors() []string
+	StateValuesSet() map[string]interface{}
+	StateValuesFiles() []string
+	Env() string
+
+	loggingConfig
+}
+
+type DeprecatedChartsConfigProvider interface {
+	Values() []string
+
+	concurrencyConfig
+	loggingConfig
+}
+
+type DepsConfigProvider interface {
+	Args() string
+	SkipRepos() bool
+}
+
+type ReposConfigProvider interface {
+	Args() string
+}
+
+type ApplyConfigProvider interface {
+	Args() string
+
+	Values() []string
+	Set() []string
+	SkipDeps() bool
+
+	SuppressSecrets() bool
+
+	NoColor() bool
+	Context() int
+
+	concurrencyConfig
+	interactive
+	loggingConfig
+}
+
+type SyncConfigProvider interface {
+	Args() string
+
+	Values() []string
+	Set() []string
+	SkipDeps() bool
+
+	concurrencyConfig
+	loggingConfig
+}
+
+type DiffConfigProvider interface {
+	Args() string
+
+	Values() []string
+	Set() []string
+	SkipDeps() bool
+
+	SuppressSecrets() bool
+
+	DetailedExitcode() bool
+	NoColor() bool
+	Context() int
+
+	concurrencyConfig
+}
+
+type DeleteConfigProvider interface {
+	Args() string
+
+	Purge() bool
+
+	interactive
+	loggingConfig
+	concurrencyConfig
+}
+
+type DestroyConfigProvider interface {
+	Args() string
+
+	interactive
+	loggingConfig
+	concurrencyConfig
+}
+
+type TestConfigProvider interface {
+	Args() string
+
+	Timeout() int
+	Cleanup() bool
+
+	concurrencyConfig
+}
+
+type LintConfigProvider interface {
+	Args() string
+
+	Values() []string
+	Set() []string
+	SkipDeps() bool
+
+	concurrencyConfig
+}
+
+type TemplateConfigProvider interface {
+	Args() string
+
+	Values() []string
+	Set() []string
+	SkipDeps() bool
+	OutputDir() string
+
+	concurrencyConfig
+}
+
+type StatusesConfigProvider interface {
+	Args() string
+
+	concurrencyConfig
+}
+
+type StateConfigProvider interface {
+}
+
+type concurrencyConfig interface {
+	Concurrency() int
+}
+
+type loggingConfig interface {
+	Logger() *zap.SugaredLogger
+}
+
+type interactive interface {
+	Interactive() bool
+}
@@ -0,0 +1,22 @@
+package app
+
+import (
+	"os"
+	"strings"
+)
+
+const (
+	DefaultHelmfile              = "helmfile.yaml"
+	DeprecatedHelmfile           = "charts.yaml"
+	DefaultHelmfileDirectory     = "helmfile.d"
+	ExperimentalEnvVar           = "HELMFILE_EXPERIMENTAL"         // environment variable for experimental features, expecting "true" lower case
+	ExperimentalSelectorExplicit = "explicit-selector-inheritance" // value to remove default selector inheritance to sub-helmfiles and use the explicit one
+)
+
+func experimentalModeEnabled() bool {
+	return os.Getenv(ExperimentalEnvVar) == "true"
+}
+
+func isExplicitSelectorInheritanceEnabled() bool {
+	return experimentalModeEnabled() || strings.Contains(os.Getenv(ExperimentalEnvVar), ExperimentalSelectorExplicit)
+}
@@ -0,0 +1,27 @@
+package app
+
+import (
+	"gotest.tools/assert"
+	is "gotest.tools/assert/cmp"
+	"gotest.tools/env"
+	"os"
+	"testing"
+)
+
+func TestIsExplicitSelectorInheritanceEnabled(t *testing.T) {
+	//env var ExperimentalEnvVar is set
+	assert.Assert(t, is.Equal(os.Getenv(ExperimentalEnvVar), ""))
+	assert.Check(t, !isExplicitSelectorInheritanceEnabled())
+
+	//check for env var ExperimentalEnvVar set to true
+	defer env.Patch(t, ExperimentalEnvVar, "true")()
+	assert.Check(t, isExplicitSelectorInheritanceEnabled())
+
+	//check for env var ExperimentalEnvVar set to anything
+	defer env.Patch(t, ExperimentalEnvVar, "foo")()
+	assert.Check(t, !isExplicitSelectorInheritanceEnabled())
+
+	//check for env var ExperimentalEnvVar set to ExperimentalSelectorExplicit
+	defer env.Patch(t, ExperimentalEnvVar, ExperimentalSelectorExplicit)()
+	assert.Check(t, isExplicitSelectorInheritanceEnabled())
+}
@@ -0,0 +1,35 @@
+package app
+
+import (
+	"github.com/roboll/helmfile/pkg/state"
+)
+
+type Context struct {
+	updatedRepos map[string]struct{}
+}
+
+func NewContext() Context {
+	return Context{
+		updatedRepos: map[string]struct{}{},
+	}
+}
+
+func (ctx Context) SyncReposOnce(st *state.HelmState, helm state.RepoUpdater) []error {
+	var errs []error
+
+	allUpdated := true
+	for _, r := range st.Repositories {
+		_, exists := ctx.updatedRepos[r.Name]
+		allUpdated = allUpdated && exists
+	}
+
+	if !allUpdated {
+		errs = st.SyncRepos(helm)
+
+		for _, r := range st.Repositories {
+			ctx.updatedRepos[r.Name] = struct{}{}
+		}
+	}
+
+	return errs
+}
@@ -0,0 +1,205 @@
+package app
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"path/filepath"
+	"sort"
+
+	"github.com/imdario/mergo"
+	"github.com/roboll/helmfile/pkg/environment"
+	"github.com/roboll/helmfile/pkg/helmexec"
+	"github.com/roboll/helmfile/pkg/state"
+	"go.uber.org/zap"
+)
+
+type desiredStateLoader struct {
+	KubeContext string
+	Reverse     bool
+
+	env       string
+	namespace string
+
+	readFile   func(string) ([]byte, error)
+	fileExists func(string) (bool, error)
+	abs        func(string) (string, error)
+	glob       func(string) ([]string, error)
+
+	logger *zap.SugaredLogger
+	helm   helmexec.Interface
+}
+
+func (ld *desiredStateLoader) Load(f string, opts LoadOpts) (*state.HelmState, error) {
+	var overrodeEnv *environment.Environment
+
+	args := opts.Environment.OverrideValues
+
+	if len(args) > 0 {
+		if opts.CalleePath == "" {
+			return nil, fmt.Errorf("bug: opts.CalleePath was nil: f=%s, opts=%v", f, opts)
+		}
+		storage := state.NewStorage(opts.CalleePath, ld.logger, ld.glob)
+		envld := state.NewEnvironmentValuesLoader(storage, ld.readFile, ld.logger)
+		handler := state.MissingFileHandlerError
+		vals, err := envld.LoadEnvironmentValues(&handler, args)
+		if err != nil {
+			return nil, err
+		}
+
+		overrodeEnv = &environment.Environment{
+			Name:   ld.env,
+			Values: vals,
+		}
+	}
+
+	st, err := ld.loadFileWithOverrides(nil, overrodeEnv, filepath.Dir(f), filepath.Base(f), true)
+	if err != nil {
+		return nil, err
+	}
+
+	if ld.Reverse {
+		rev := func(i, j int) bool {
+			return j < i
+		}
+		sort.Slice(st.Releases, rev)
+		sort.Slice(st.Helmfiles, rev)
+	}
+
+	if ld.KubeContext != "" {
+		if st.HelmDefaults.KubeContext != "" {
+			return nil, errors.New("err: Cannot use option --kube-context and set attribute helmDefaults.kubeContext.")
+		}
+		st.HelmDefaults.KubeContext = ld.KubeContext
+	}
+
+	if ld.namespace != "" {
+		if st.Namespace != "" {
+			return nil, errors.New("err: Cannot use option --namespace and set attribute namespace.")
+		}
+		st.Namespace = ld.namespace
+	}
+
+	return st, nil
+}
+
+func (ld *desiredStateLoader) loadFile(inheritedEnv *environment.Environment, baseDir, file string, evaluateBases bool) (*state.HelmState, error) {
+	return ld.loadFileWithOverrides(inheritedEnv, nil, baseDir, file, evaluateBases)
+}
+
+func (ld *desiredStateLoader) loadFileWithOverrides(inheritedEnv, overrodeEnv *environment.Environment, baseDir, file string, evaluateBases bool) (*state.HelmState, error) {
+	var f string
+	if filepath.IsAbs(file) {
+		f = file
+	} else {
+		f = filepath.Join(baseDir, file)
+	}
+
+	fileBytes, err := ld.readFile(f)
+	if err != nil {
+		return nil, err
+	}
+
+	ext := filepath.Ext(f)
+
+	var self *state.HelmState
+
+	if !experimentalModeEnabled() || ext == ".gotmpl" {
+		self, err = ld.renderAndLoad(
+			inheritedEnv,
+			overrodeEnv,
+			baseDir,
+			f,
+			fileBytes,
+			evaluateBases,
+		)
+	} else {
+		self, err = ld.load(
+			fileBytes,
+			baseDir,
+			file,
+			evaluateBases,
+			inheritedEnv,
+			overrodeEnv,
+		)
+	}
+
+	return self, err
+}
+
+func (a *desiredStateLoader) underlying() *state.StateCreator {
+	c := state.NewCreator(a.logger, a.readFile, a.fileExists, a.abs, a.glob, a.helm)
+	c.LoadFile = a.loadFile
+	return c
+}
+
+func (a *desiredStateLoader) load(yaml []byte, baseDir, file string, evaluateBases bool, env, overrodeEnv *environment.Environment) (*state.HelmState, error) {
+	merged, err := env.Merge(overrodeEnv)
+	if err != nil {
+		return nil, err
+	}
+
+	st, err := a.underlying().ParseAndLoad(yaml, baseDir, file, a.env, evaluateBases, merged)
+	if err != nil {
+		return nil, err
+	}
+
+	helmfiles, err := st.ExpandedHelmfiles()
+	if err != nil {
+		return nil, err
+	}
+	st.Helmfiles = helmfiles
+
+	return st, nil
+}
+
+func (ld *desiredStateLoader) renderAndLoad(env, overrodeEnv *environment.Environment, baseDir, filename string, content []byte, evaluateBases bool) (*state.HelmState, error) {
+	parts := bytes.Split(content, []byte("\n---\n"))
+
+	var finalState *state.HelmState
+
+	for i, part := range parts {
+		var yamlBuf *bytes.Buffer
+		var err error
+
+		id := fmt.Sprintf("%s.part.%d", filename, i)
+
+		if env == nil && overrodeEnv == nil {
+			yamlBuf, err = ld.renderTemplatesToYaml(baseDir, id, part)
+			if err != nil {
+				return nil, fmt.Errorf("error during %s parsing: %v", id, err)
+			}
+		} else {
+			yamlBuf, err = ld.renderTemplatesToYamlWithEnv(baseDir, id, part, env, overrodeEnv)
+			if err != nil {
+				return nil, fmt.Errorf("error during %s parsing: %v", id, err)
+			}
+		}
+
+		currentState, err := ld.load(
+			yamlBuf.Bytes(),
+			baseDir,
+			filename,
+			evaluateBases,
+			env,
+			overrodeEnv,
+		)
+		if err != nil {
+			return nil, err
+		}
+
+		if finalState == nil {
+			finalState = currentState
+		} else {
+			if err := mergo.Merge(finalState, currentState, mergo.WithOverride); err != nil {
+				return nil, err
+			}
+		}
+
+		env = &finalState.Env
+
+		ld.logger.Debugf("merged environment: %v", env)
+	}
+
+	return finalState, nil
+}
@@ -0,0 +1,19 @@
+package app
+
+import (
+	"fmt"
+	"strings"
+)
+
+type NoMatchingHelmfileError struct {
+	selectors []string
+	env       string
+}
+
+func (e *NoMatchingHelmfileError) Error() string {
+	return fmt.Sprintf(
+		"err: no releases found that matches specified selector(%s) and environment(%s), in any helmfile",
+		strings.Join(e.selectors, ", "),
+		e.env,
+	)
+}
@@ -0,0 +1,28 @@
+package app
+
+import (
+	"github.com/roboll/helmfile/pkg/state"
+	"gopkg.in/yaml.v2"
+)
+
+type LoadOpts struct {
+	Selectors   []string
+	Environment state.SubhelmfileEnvironmentSpec
+
+	// CalleePath is the absolute path to the file being loaded
+	CalleePath string
+}
+
+func (o LoadOpts) DeepCopy() LoadOpts {
+	bytes, err := yaml.Marshal(o)
+	if err != nil {
+		panic(err)
+	}
+
+	new := LoadOpts{}
+	if err := yaml.Unmarshal(bytes, &new); err != nil {
+		panic(err)
+	}
+
+	return new
+}
@@ -0,0 +1,332 @@
+package app
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/roboll/helmfile/pkg/argparser"
+	"github.com/roboll/helmfile/pkg/helmexec"
+	"github.com/roboll/helmfile/pkg/state"
+)
+
+type Run struct {
+	state *state.HelmState
+	helm  helmexec.Interface
+	ctx   Context
+
+	Ask func(string) bool
+}
+
+func NewRun(st *state.HelmState, helm helmexec.Interface, ctx Context) *Run {
+	return &Run{state: st, helm: helm, ctx: ctx}
+}
+
+func (r *Run) askForConfirmation(msg string) bool {
+	if r.Ask != nil {
+		return r.Ask(msg)
+	}
+	return AskForConfirmation(msg)
+}
+
+func (r *Run) Deps(c DepsConfigProvider) []error {
+	r.helm.SetExtraArgs(argparser.GetArgs(c.Args(), r.state)...)
+
+	if !c.SkipRepos() {
+		if errs := r.ctx.SyncReposOnce(r.state, r.helm); errs != nil && len(errs) > 0 {
+			return errs
+		}
+	}
+
+	return r.state.UpdateDeps(r.helm)
+}
+
+func (r *Run) Repos(c ReposConfigProvider) []error {
+	r.helm.SetExtraArgs(argparser.GetArgs(c.Args(), r.state)...)
+
+	return r.ctx.SyncReposOnce(r.state, r.helm)
+}
+
+func (r *Run) DeprecatedSyncCharts(c DeprecatedChartsConfigProvider) []error {
+	st := r.state
+	helm := r.helm
+
+	affectedReleases := state.AffectedReleases{}
+	errs := st.SyncReleases(&affectedReleases, helm, c.Values(), c.Concurrency())
+	affectedReleases.DisplayAffectedReleases(c.Logger())
+	return errs
+}
+
+func (r *Run) Status(c StatusesConfigProvider) []error {
+	workers := c.Concurrency()
+
+	r.helm.SetExtraArgs(argparser.GetArgs(c.Args(), r.state)...)
+
+	return r.state.ReleaseStatuses(r.helm, workers)
+}
+
+func (r *Run) Delete(c DeleteConfigProvider) []error {
+	affectedReleases := state.AffectedReleases{}
+	purge := c.Purge()
+
+	errs := []error{}
+
+	names := make([]string, len(r.state.Releases))
+	for i, r := range r.state.Releases {
+		names[i] = fmt.Sprintf("  %s (%s)", r.Name, r.Chart)
+	}
+
+	msg := fmt.Sprintf(`Affected releases are:
+%s
+
+Do you really want to delete?
+  Helmfile will delete all your releases, as shown above.
+
+`, strings.Join(names, "\n"))
+	interactive := c.Interactive()
+	if !interactive || interactive && r.askForConfirmation(msg) {
+		r.helm.SetExtraArgs(argparser.GetArgs(c.Args(), r.state)...)
+
+		errs = r.state.DeleteReleases(&affectedReleases, r.helm, c.Concurrency(), purge)
+	}
+	affectedReleases.DisplayAffectedReleases(c.Logger())
+	return errs
+}
+
+func (r *Run) Destroy(c DestroyConfigProvider) []error {
+	errs := []error{}
+	affectedReleases := state.AffectedReleases{}
+
+	names := make([]string, len(r.state.Releases))
+	for i, r := range r.state.Releases {
+		names[i] = fmt.Sprintf("  %s (%s)", r.Name, r.Chart)
+	}
+
+	msg := fmt.Sprintf(`Affected releases are:
+%s
+
+Do you really want to delete?
+  Helmfile will delete all your releases, as shown above.
+
+`, strings.Join(names, "\n"))
+	interactive := c.Interactive()
+	if !interactive || interactive && r.askForConfirmation(msg) {
+		r.helm.SetExtraArgs(argparser.GetArgs(c.Args(), r.state)...)
+
+		errs = r.state.DeleteReleases(&affectedReleases, r.helm, c.Concurrency(), true)
+	}
+	affectedReleases.DisplayAffectedReleases(c.Logger())
+	return errs
+}
+
+func (r *Run) Apply(c ApplyConfigProvider) []error {
+	st := r.state
+	helm := r.helm
+	ctx := r.ctx
+
+	affectedReleases := state.AffectedReleases{}
+	if !c.SkipDeps() {
+		if errs := ctx.SyncReposOnce(st, helm); errs != nil && len(errs) > 0 {
+			return errs
+		}
+		if errs := st.BuildDeps(helm); errs != nil && len(errs) > 0 {
+			return errs
+		}
+	}
+	if errs := st.PrepareReleases(helm, "apply"); errs != nil && len(errs) > 0 {
+		return errs
+	}
+
+	// helm must be 2.11+ and helm-diff should be provided `--detailed-exitcode` in order for `helmfile apply` to work properly
+	detailedExitCode := true
+
+	diffOpts := &state.DiffOpts{
+		NoColor: c.NoColor(),
+		Context: c.Context(),
+		Set:     c.Set(),
+	}
+
+	releases, errs := st.DiffReleases(helm, c.Values(), c.Concurrency(), detailedExitCode, c.SuppressSecrets(), false, diffOpts)
+
+	releasesToBeDeleted, err := st.DetectReleasesToBeDeleted(helm)
+	if err != nil {
+		errs = append(errs, err)
+	}
+
+	fatalErrs := []error{}
+
+	noError := true
+	for _, e := range errs {
+		switch err := e.(type) {
+		case *state.ReleaseError:
+			if err.Code != 2 {
+				noError = false
+				fatalErrs = append(fatalErrs, e)
+			}
+		default:
+			noError = false
+			fatalErrs = append(fatalErrs, e)
+		}
+	}
+
+	// sync only when there are changes
+	if noError {
+		if len(releases) == 0 && len(releasesToBeDeleted) == 0 {
+			// TODO better way to get the logger
+			logger := c.Logger()
+			logger.Infof("")
+			logger.Infof("No affected releases")
+		} else {
+			names := []string{}
+			for _, r := range releases {
+				names = append(names, fmt.Sprintf("  %s (%s) UPDATED", r.Name, r.Chart))
+			}
+			for _, r := range releasesToBeDeleted {
+				names = append(names, fmt.Sprintf("  %s (%s) DELETED", r.Name, r.Chart))
+			}
+
+			msg := fmt.Sprintf(`Affected releases are:
+%s
+
+Do you really want to apply?
+  Helmfile will apply all your changes, as shown above.
+
+`, strings.Join(names, "\n"))
+			interactive := c.Interactive()
+			if !interactive || interactive && r.askForConfirmation(msg) {
+				rs := []state.ReleaseSpec{}
+				for _, r := range releases {
+					rs = append(rs, *r)
+				}
+				for _, r := range releasesToBeDeleted {
+					rs = append(rs, *r)
+				}
+
+				r.helm.SetExtraArgs(argparser.GetArgs(c.Args(), r.state)...)
+
+				st.Releases = rs
+				syncOpts := &state.SyncOpts{
+					Set: c.Set(),
+				}
+				return st.SyncReleases(&affectedReleases, helm, c.Values(), c.Concurrency(), syncOpts)
+			}
+		}
+	}
+
+	affectedReleases.DisplayAffectedReleases(c.Logger())
+	return fatalErrs
+}
+
+func (r *Run) Diff(c DiffConfigProvider) []error {
+	st := r.state
+	helm := r.helm
+	ctx := r.ctx
+
+	if !c.SkipDeps() {
+		if errs := ctx.SyncReposOnce(st, helm); errs != nil && len(errs) > 0 {
+			return errs
+		}
+		if errs := st.BuildDeps(helm); errs != nil && len(errs) > 0 {
+			return errs
+		}
+	}
+	if errs := st.PrepareReleases(helm, "diff"); errs != nil && len(errs) > 0 {
+		return errs
+	}
+
+	r.helm.SetExtraArgs(argparser.GetArgs(c.Args(), r.state)...)
+
+	opts := &state.DiffOpts{
+		Context: c.Context(),
+		NoColor: c.NoColor(),
+		Set:     c.Set(),
+	}
+	_, errs := st.DiffReleases(helm, c.Values(), c.Concurrency(), c.DetailedExitcode(), c.SuppressSecrets(), true, opts)
+	return errs
+}
+
+func (r *Run) Sync(c SyncConfigProvider) []error {
+	st := r.state
+	helm := r.helm
+	ctx := r.ctx
+
+	affectedReleases := state.AffectedReleases{}
+	if !c.SkipDeps() {
+		if errs := ctx.SyncReposOnce(st, helm); errs != nil && len(errs) > 0 {
+			return errs
+		}
+		if errs := st.BuildDeps(helm); errs != nil && len(errs) > 0 {
+			return errs
+		}
+	}
+	if errs := st.PrepareReleases(helm, "sync"); errs != nil && len(errs) > 0 {
+		return errs
+	}
+
+	r.helm.SetExtraArgs(argparser.GetArgs(c.Args(), r.state)...)
+
+	opts := &state.SyncOpts{
+		Set: c.Set(),
+	}
+	errs := st.SyncReleases(&affectedReleases, helm, c.Values(), c.Concurrency(), opts)
+	affectedReleases.DisplayAffectedReleases(c.Logger())
+	return errs
+}
+
+func (r *Run) Template(c TemplateConfigProvider) []error {
+	st := r.state
+	helm := r.helm
+	ctx := r.ctx
+
+	if !c.SkipDeps() {
+		if errs := ctx.SyncReposOnce(st, helm); errs != nil && len(errs) > 0 {
+			return errs
+		}
+		if errs := st.BuildDeps(helm); errs != nil && len(errs) > 0 {
+			return errs
+		}
+	}
+	if errs := st.PrepareReleases(helm, "template"); errs != nil && len(errs) > 0 {
+		return errs
+	}
+
+	args := argparser.GetArgs(c.Args(), st)
+	opts := &state.TemplateOpts{
+		Set: c.Set(),
+	}
+	return st.TemplateReleases(helm, c.OutputDir(), c.Values(), args, c.Concurrency(), opts)
+}
+
+func (r *Run) Test(c TestConfigProvider) []error {
+	cleanup := c.Cleanup()
+	timeout := c.Timeout()
+	concurrency := c.Concurrency()
+
+	r.helm.SetExtraArgs(argparser.GetArgs(c.Args(), r.state)...)
+
+	return r.state.TestReleases(r.helm, cleanup, timeout, concurrency)
+}
+
+func (r *Run) Lint(c LintConfigProvider) []error {
+	st := r.state
+	helm := r.helm
+	ctx := r.ctx
+
+	values := c.Values()
+	args := argparser.GetArgs(c.Args(), st)
+	workers := c.Concurrency()
+	if !c.SkipDeps() {
+		if errs := ctx.SyncReposOnce(st, helm); errs != nil && len(errs) > 0 {
+			return errs
+		}
+		if errs := st.BuildDeps(helm); errs != nil && len(errs) > 0 {
+			return errs
+		}
+	}
+	if errs := st.PrepareReleases(helm, "lint"); errs != nil && len(errs) > 0 {
+		return errs
+	}
+	opts := &state.LintOpts{
+		Set: c.Set(),
+	}
+	return st.LintReleases(helm, values, args, workers, opts)
+}
@@ -0,0 +1,145 @@
+package app
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/google/go-cmp/cmp"
+	"github.com/roboll/helmfile/pkg/environment"
+	"github.com/roboll/helmfile/pkg/state"
+	"github.com/roboll/helmfile/pkg/tmpl"
+	"strings"
+)
+
+func prependLineNumbers(text string) string {
+	buf := bytes.NewBufferString("")
+	lines := strings.Split(text, "\n")
+	for i, line := range lines {
+		buf.WriteString(fmt.Sprintf("%2d: %s\n", i, line))
+	}
+	return buf.String()
+}
+
+func (r *desiredStateLoader) renderPrestate(firstPassEnv *environment.Environment, baseDir, filename string, content []byte) (*environment.Environment, *state.HelmState) {
+	tmplData := state.EnvironmentTemplateData{
+		Environment: *firstPassEnv,
+		Namespace:   r.namespace,
+		Values:      map[string]interface{}{},
+	}
+	firstPassRenderer := tmpl.NewFirstPassRenderer(baseDir, tmplData)
+
+	// parse as much as we can, tolerate errors, this is a preparse
+	yamlBuf, err := firstPassRenderer.RenderTemplateContentToBuffer(content)
+	if err != nil && r.logger != nil {
+		r.logger.Debugf("first-pass rendering input of \"%s\":\n%s", filename, prependLineNumbers(string(content)))
+		if yamlBuf == nil { // we have a template syntax error, let the second parse report
+			r.logger.Debugf("template syntax error: %v", err)
+			return firstPassEnv, nil
+		}
+	}
+	yamlData := yamlBuf.String()
+
+	// Work-around for https://github.com/golang/go/issues/24963
+	sanitized := strings.ReplaceAll(yamlData, "<no value>", "")
+
+	if len(yamlData) != len(sanitized) {
+		msg := "replaced <no value>s to workaround https://github.com/golang/go/issues/24963 to address https://github.com/roboll/helmfile/issues/553:\n%s"
+		r.logger.Debugf(msg, cmp.Diff(yamlData, sanitized))
+	}
+
+	c := r.underlying()
+	c.Strict = false
+	// create preliminary state, as we may have an environment. Tolerate errors.
+	prestate, err := c.ParseAndLoad([]byte(sanitized), baseDir, filename, r.env, false, firstPassEnv)
+	if err != nil && r.logger != nil {
+		switch err.(type) {
+		case *state.StateLoadError:
+			r.logger.Infof("could not deduce `environment:` block, configuring only .Environment.Name. error: %v", err)
+		}
+		r.logger.Debugf("error in first-pass rendering: result of \"%s\":\n%s", filename, prependLineNumbers(yamlBuf.String()))
+	}
+
+	if prestate != nil {
+		firstPassEnv = &prestate.Env
+	}
+
+	return firstPassEnv, prestate
+}
+
+type RenderOpts struct {
+}
+
+func (r *desiredStateLoader) renderTemplatesToYaml(baseDir, filename string, content []byte) (*bytes.Buffer, error) {
+	env := &environment.Environment{Name: r.env, Values: map[string]interface{}(nil)}
+
+	return r.renderTemplatesToYamlWithEnv(baseDir, filename, content, env, nil)
+}
+
+func (r *desiredStateLoader) renderTemplatesToYamlWithEnv(baseDir, filename string, content []byte, inherited, overrode *environment.Environment) (*bytes.Buffer, error) {
+	return r.twoPassRenderTemplateToYaml(inherited, overrode, baseDir, filename, content)
+}
+
+func (r *desiredStateLoader) twoPassRenderTemplateToYaml(inherited, overrode *environment.Environment, baseDir, filename string, content []byte) (*bytes.Buffer, error) {
+	// try a first pass render. This will always succeed, but can produce a limited env
+	if r.logger != nil {
+		r.logger.Debugf("first-pass rendering starting for \"%s\": inherited=%v, overrode=%v", filename, inherited, overrode)
+	}
+
+	initEnv, err := inherited.Merge(overrode)
+	if err != nil {
+		return nil, err
+	}
+
+	if r.logger != nil {
+		r.logger.Debugf("first-pass uses: %v", initEnv)
+	}
+
+	renderedEnv, prestate := r.renderPrestate(initEnv, baseDir, filename, content)
+
+	if r.logger != nil {
+		r.logger.Debugf("first-pass produced: %v", renderedEnv)
+	}
+
+	finalEnv, err := inherited.Merge(renderedEnv)
+	if err != nil {
+		return nil, err
+	}
+
+	finalEnv, err = finalEnv.Merge(overrode)
+	if err != nil {
+		return nil, err
+	}
+
+	if r.logger != nil {
+		r.logger.Debugf("first-pass rendering result of \"%s\": %v", filename, *finalEnv)
+	}
+
+	vals := map[string]interface{}{}
+	if prestate != nil {
+		prestate.Env = *finalEnv
+		vals, err = prestate.Values()
+		if err != nil {
+			return nil, err
+		}
+	}
+	if prestate != nil {
+		r.logger.Debugf("vals:\n%v\ndefaultVals:%v", vals, prestate.DefaultValues)
+	}
+
+	tmplData := state.EnvironmentTemplateData{
+		Environment: *finalEnv,
+		Namespace:   r.namespace,
+		Values:      vals,
+	}
+	secondPassRenderer := tmpl.NewFileRenderer(r.readFile, baseDir, tmplData)
+	yamlBuf, err := secondPassRenderer.RenderTemplateContentToBuffer(content)
+	if err != nil {
+		if r.logger != nil {
+			r.logger.Debugf("second-pass rendering failed, input of \"%s\":\n%s", filename, prependLineNumbers(string(content)))
+		}
+		return nil, err
+	}
+	if r.logger != nil {
+		r.logger.Debugf("second-pass rendering result of \"%s\":\n%s", filename, prependLineNumbers(yamlBuf.String()))
+	}
+	return yamlBuf, nil
+}
@@ -0,0 +1,234 @@
+package app
+
+import (
+	"os"
+	"strings"
+	"testing"
+
+	"github.com/roboll/helmfile/pkg/helmexec"
+	"github.com/roboll/helmfile/pkg/state"
+	"github.com/roboll/helmfile/pkg/testhelper"
+
+	"gopkg.in/yaml.v2"
+)
+
+func makeLoader(files map[string]string, env string) (*desiredStateLoader, *testhelper.TestFs) {
+	testfs := testhelper.NewTestFs(files)
+	return &desiredStateLoader{
+		env:        env,
+		namespace:  "namespace",
+		logger:     helmexec.NewLogger(os.Stdout, "debug"),
+		readFile:   testfs.ReadFile,
+		fileExists: testfs.FileExists,
+		abs:        testfs.Abs,
+		glob:       testfs.Glob,
+	}, testfs
+}
+
+func TestReadFromYaml_MakeEnvironmentHasNoSideEffects(t *testing.T) {
+
+	yamlContent := []byte(`
+environments:
+  staging:
+    values:
+    - default/values.yaml
+  production:
+
+releases:
+- name: {{ readFile "other/default/values.yaml" }}
+  chart: mychart1
+`)
+
+	files := map[string]string{
+		"/path/to/default/values.yaml":       ``,
+		"/path/to/other/default/values.yaml": `SecondPass`,
+	}
+
+	r, testfs := makeLoader(files, "staging")
+	yamlBuf, err := r.renderTemplatesToYaml("", "", yamlContent)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	var state state.HelmState
+	err = yaml.Unmarshal(yamlBuf.Bytes(), &state)
+
+	if testfs.FileReaderCalls() > 2 {
+		t.Error("reader should be called only twice")
+	}
+
+	if state.Releases[0].Name != "SecondPass" {
+		t.Errorf("release name should have ben set as SecondPass")
+	}
+}
+
+func TestReadFromYaml_RenderTemplate(t *testing.T) {
+
+	defaultValuesYaml := `
+releaseName: "hello"
+conditionalReleaseTag: "yes"
+`
+
+	yamlContent := []byte(`
+environments:
+  staging:
+    values:
+    - default/values.yaml
+  production:
+
+releases:
+- name: {{ .Environment.Values.releaseName }}
+  chart: mychart1
+
+{{ if (eq .Environment.Values.conditionalReleaseTag "yes") }}
+- name: conditionalRelease
+{{ end }}
+
+`)
+
+	files := map[string]string{
+		"/path/to/default/values.yaml": defaultValuesYaml,
+	}
+
+	r, _ := makeLoader(files, "staging")
+	// test the double rendering
+	yamlBuf, err := r.renderTemplatesToYaml("", "", yamlContent)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	var state state.HelmState
+	err = yaml.Unmarshal(yamlBuf.Bytes(), &state)
+
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+
+	if len(state.Releases) != 2 {
+		t.Fatal("there should be 2 releases")
+	}
+
+	if state.Releases[0].Name != "hello" {
+		t.Errorf("release name should be hello")
+	}
+
+	if state.Releases[1].Name != "conditionalRelease" {
+		t.Error("conditional release should have been present")
+	}
+}
+
+func TestReadFromYaml_RenderTemplateWithValuesReferenceError(t *testing.T) {
+	defaultValuesYaml := ``
+
+	yamlContent := []byte(`
+environments:
+  staging:
+    values:
+    - default/values.yaml
+  production:
+
+{{ if (eq .Environment.Values.releaseName "a") }} # line 8
+releases:
+- name: a
+	chart: mychart1
+{{ end }}
+`)
+
+	files := map[string]string{
+		"/path/to/default/values.yaml": defaultValuesYaml,
+	}
+
+	r, _ := makeLoader(files, "staging")
+	// test the double rendering
+	_, err := r.renderTemplatesToYaml("", "", yamlContent)
+
+	if !strings.Contains(err.Error(), "stringTemplate:8") {
+		t.Fatalf("error should contain a stringTemplate error (reference to unknow key) %v", err)
+	}
+}
+
+// This test shows that a gotmpl reference will get rendered correctly
+// even if the pre-render disables the readFile and exec functions.
+// This does not apply to .gotmpl files, which is a nice side-effect.
+func TestReadFromYaml_RenderTemplateWithGotmpl(t *testing.T) {
+
+	defaultValuesYamlGotmpl := `
+releaseName: {{ readFile "nonIgnoredFile" }}
+`
+
+	yamlContent := []byte(`
+environments:
+  staging:
+    values:
+    - values.yaml.gotmpl
+  production:
+
+{{ if (eq .Environment.Values.releaseName "release-a") }} # line 8
+releases:
+- name: a
+  chart: mychart1
+{{ end }}
+`)
+
+	files := map[string]string{
+		"/path/to/nonIgnoredFile":     `release-a`,
+		"/path/to/values.yaml.gotmpl": defaultValuesYamlGotmpl,
+	}
+
+	r, _ := makeLoader(files, "staging")
+	rendered, _ := r.renderTemplatesToYaml("", "", yamlContent)
+
+	var state state.HelmState
+	yaml.Unmarshal(rendered.Bytes(), &state)
+
+	if len(state.Releases) != 1 {
+		t.Fatal("there should be 1 release")
+	}
+
+	if state.Releases[0].Name != "a" {
+		t.Fatal("release should have been declared")
+	}
+}
+
+func TestReadFromYaml_RenderTemplateWithNamespace(t *testing.T) {
+	yamlContent := []byte(`releases:
+- name: {{ .Namespace }}-myrelease
+  chart: mychart
+`)
+
+	files := map[string]string{}
+
+	r, _ := makeLoader(files, "staging")
+	yamlBuf, err := r.renderTemplatesToYaml("", "", yamlContent)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	var state state.HelmState
+	err = yaml.Unmarshal(yamlBuf.Bytes(), &state)
+
+	if state.Releases[0].Name != "namespace-myrelease" {
+		t.Errorf("release name should be namespace-myrelease")
+	}
+}
+
+func TestReadFromYaml_HelmfileShouldBeResilentToTemplateErrors(t *testing.T) {
+	yamlContent := []byte(`environments:
+  staging:
+	production:
+
+releases:
+{{ if (eq .Environment.Name "production" }}  # notice syntax error: unclosed left paren
+- name: prod-myrelease
+{{ else }}
+- name: myapp
+{{ end }}
+  chart: mychart
+`)
+
+	r, _ := makeLoader(map[string]string{}, "staging")
+	_, err := r.renderTemplatesToYaml("", "", yamlContent)
+	if err == nil {
+		t.Fatalf("wanted error, none returned")
+	}
+}
@@ -0,0 +1,107 @@
+package argparser
+
+import (
+	"fmt"
+	"github.com/roboll/helmfile/pkg/state"
+	"strings"
+)
+
+type keyVal struct {
+	key       string
+	val       string
+	spaceFlag bool
+}
+type argMap struct {
+	//m map[string]string
+	m     map[string][]*keyVal
+	flags []string
+}
+
+func (a *argMap) SetArg(flag, arg string, isSpace bool) {
+	if _, exists := a.m[flag]; !exists {
+		keyarg := &keyVal{key: flag, val: arg, spaceFlag: isSpace}
+		a.m[flag] = append(a.m[flag], keyarg)
+		a.flags = append(a.flags, flag)
+	} else if flag == "--set" || flag == "-f" || flag == "--values" {
+		keyarg := &keyVal{key: flag, val: arg, spaceFlag: isSpace}
+		a.m[flag] = append(a.m[flag], keyarg)
+	}
+}
+
+func newArgMap() *argMap {
+	return &argMap{m: map[string][]*keyVal{}}
+}
+
+func GetArgs(args string, state *state.HelmState) []string {
+	argsMap := newArgMap()
+
+	if len(args) > 0 {
+		argsVals := strings.Split(args, " ")
+		for index, arg := range argsVals {
+			if strings.HasPrefix(arg, "--") {
+				argVal := strings.SplitN(arg, "=", 2)
+				if len(argVal) > 1 {
+					arg := argVal[0]
+					value := argVal[1]
+					argsMap.SetArg(arg, value, false)
+				} else {
+					//check if next value is arg to flag
+					if index+1 < len(argsVals) {
+						nextVal := argsVals[index+1]
+						if strings.HasPrefix(nextVal, "--") {
+							argsMap.SetArg(arg, "", false)
+						} else {
+							argsMap.SetArg(arg, nextVal, true)
+						}
+					} else {
+						argsMap.SetArg(arg, "", false)
+					}
+				}
+			}
+		}
+	}
+
+	if len(state.HelmDefaults.Args) > 0 {
+		for _, arg := range state.HelmDefaults.Args {
+			var flag string
+			var val string
+
+			argsNum, _ := fmt.Sscanf(arg, "--%s %s", &flag, &val)
+			if argsNum == 2 {
+				argsMap.SetArg(flag, val, true)
+			} else {
+				argVal := strings.SplitN(arg, "=", 2)
+				argFirst := argVal[0]
+				if len(argVal) > 1 {
+					val = argVal[1]
+					argsMap.SetArg(argFirst, val, false)
+				} else {
+					argsMap.SetArg(argFirst, "", false)
+				}
+			}
+		}
+	}
+
+	var argArr []string
+
+	for _, flag := range argsMap.flags {
+		val := argsMap.m[flag]
+
+		for _, obj := range val {
+			if obj.val != "" {
+				if obj.spaceFlag {
+					argArr = append(argArr, obj.key, obj.val)
+				} else {
+					argArr = append(argArr, fmt.Sprintf("%s=%s", obj.key, obj.val))
+				}
+			} else {
+				argArr = append(argArr, fmt.Sprintf("%s", obj.key))
+			}
+		}
+
+	}
+
+	state.HelmDefaults.Args = argArr
+
+	return state.HelmDefaults.Args
+}
@@ -0,0 +1,45 @@
+package argparser
+
+import (
+	"github.com/roboll/helmfile/pkg/state"
+	"strings"
+	"testing"
+)
+
+func TestGetArgs(t *testing.T) {
+	args := "--timeout=3600 --set app1.bootstrap=true --set app2.bootstrap=false --tiller-namespace ns"
+	defaultArgs := []string{"--recreate-pods", "--force"}
+	Helmdefaults := state.HelmSpec{KubeContext: "test", TillerNamespace: "test-namespace", Args: defaultArgs}
+	testState := &state.HelmState{HelmDefaults: Helmdefaults}
+	receivedArgs := GetArgs(args, testState)
+
+	expectedOutput := "--timeout=3600 --set app1.bootstrap=true --set app2.bootstrap=false --tiller-namespace ns --recreate-pods --force"
+
+	if compareArgs(expectedOutput, receivedArgs) == false {
+		t.Errorf("expected %s, got %s", expectedOutput, strings.Join(receivedArgs, " "))
+	}
+}
+
+func Test2(t *testing.T) {
+	args := "--timeout=3600 --set app1.bootstrap=true --set app2.bootstrap=false,app3.bootstrap=true --tiller-namespace ns"
+	defaultArgs := []string{"--recreate-pods", "--force"}
+	Helmdefaults := state.HelmSpec{KubeContext: "test", TillerNamespace: "test-namespace", Args: defaultArgs}
+	testState := &state.HelmState{HelmDefaults: Helmdefaults}
+	receivedArgs := GetArgs(args, testState)
+
+	expectedOutput := "--timeout=3600 --set app1.bootstrap=true --set app2.bootstrap=false,app3.bootstrap=true --tiller-namespace ns --recreate-pods --force"
+
+	if compareArgs(expectedOutput, receivedArgs) == false {
+		t.Errorf("expected %s, got %s", expectedOutput, strings.Join(receivedArgs, " "))
+	}
+
+}
+
+func compareArgs(expectedArgs string, args []string) bool {
+
+	if strings.Compare(strings.Join(args, " "), expectedArgs) != 0 {
+		return false
+	}
+	return true
+
+}
@@ -0,0 +1,66 @@
+package environment
+
+import (
+	"github.com/imdario/mergo"
+	"github.com/roboll/helmfile/pkg/maputil"
+	"gopkg.in/yaml.v2"
+)
+
+type Environment struct {
+	Name     string
+	Values   map[string]interface{}
+	Defaults map[string]interface{}
+}
+
+var EmptyEnvironment Environment
+
+func (e Environment) DeepCopy() Environment {
+	valuesBytes, err := yaml.Marshal(e.Values)
+	if err != nil {
+		panic(err)
+	}
+	var values map[string]interface{}
+	if err := yaml.Unmarshal(valuesBytes, &values); err != nil {
+		panic(err)
+	}
+	values, err = maputil.CastKeysToStrings(values)
+	if err != nil {
+		panic(err)
+	}
+
+	defaultsBytes, err := yaml.Marshal(e.Defaults)
+	if err != nil {
+		panic(err)
+	}
+	var defaults map[string]interface{}
+	if err := yaml.Unmarshal(defaultsBytes, &defaults); err != nil {
+		panic(err)
+	}
+	defaults, err = maputil.CastKeysToStrings(defaults)
+	if err != nil {
+		panic(err)
+	}
+
+	return Environment{
+		Name:     e.Name,
+		Values:   values,
+		Defaults: defaults,
+	}
+}
+
+func (e *Environment) Merge(other *Environment) (*Environment, error) {
+	if e == nil {
+		if other != nil {
+			copy := other.DeepCopy()
+			return &copy, nil
+		}
+		return nil, nil
+	}
+	copy := e.DeepCopy()
+	if other != nil {
+		if err := mergo.Merge(&copy, other, mergo.WithOverride); err != nil {
+			return nil, err
+		}
+	}
+	return &copy, nil
+}
@@ -0,0 +1,111 @@
+package event
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/roboll/helmfile/pkg/environment"
+	"github.com/roboll/helmfile/pkg/helmexec"
+	"github.com/roboll/helmfile/pkg/tmpl"
+	"go.uber.org/zap"
+)
+
+type Hook struct {
+	Name     string   `yaml:"name"`
+	Events   []string `yaml:"events"`
+	Command  string   `yaml:"command"`
+	Args     []string `yaml:"args"`
+	ShowLogs bool     `yaml:"showlogs"`
+}
+
+type event struct {
+	Name  string
+	Error error
+}
+
+type Bus struct {
+	Runner helmexec.Runner
+	Hooks  []Hook
+
+	BasePath      string
+	StateFilePath string
+	Namespace     string
+
+	Env environment.Environment
+
+	ReadFile func(string) ([]byte, error)
+	Logger   *zap.SugaredLogger
+}
+
+func (bus *Bus) Trigger(evt string, evtErr error, context map[string]interface{}) (bool, error) {
+	if bus.Runner == nil {
+		bus.Runner = helmexec.ShellRunner{
+			Dir: bus.BasePath,
+		}
+	}
+
+	executed := false
+
+	for _, hook := range bus.Hooks {
+		contained := false
+		for _, e := range hook.Events {
+			contained = contained || e == evt
+		}
+		if !contained {
+			continue
+		}
+
+		var err error
+
+		name := hook.Name
+		if name == "" {
+			name = hook.Command
+		}
+
+		fmt.Fprintf(os.Stderr, "%s: basePath=%s\n", bus.StateFilePath, bus.BasePath)
+
+		data := map[string]interface{}{
+			"Environment": bus.Env,
+			"Namespace":   bus.Namespace,
+			"Event": event{
+				Name:  evt,
+				Error: evtErr,
+			},
+		}
+		for k, v := range context {
+			data[k] = v
+		}
+		render := tmpl.NewTextRenderer(bus.ReadFile, bus.BasePath, data)
+
+		bus.Logger.Debugf("hook[%s]: triggered by event \"%s\"\n", name, evt)
+
+		command, err := render.RenderTemplateText(hook.Command)
+		if err != nil {
+			return false, fmt.Errorf("hook[%s]: %v", name, err)
+		}
+
+		args := make([]string, len(hook.Args))
+		for i, raw := range hook.Args {
+			args[i], err = render.RenderTemplateText(raw)
+			if err != nil {
+				return false, fmt.Errorf("hook[%s]: %v", name, err)
+			}
+		}
+
+		bytes, err := bus.Runner.Execute(command, args, map[string]string{})
+		bus.Logger.Debugf("hook[%s]: %s\n", name, string(bytes))
+		if hook.ShowLogs {
+			prefix := fmt.Sprintf("\nhook[%s] logs | ", evt)
+			bus.Logger.Infow(prefix + strings.ReplaceAll(string(bytes), "\n", prefix))
+		}
+
+		if err != nil {
+			return false, fmt.Errorf("hook[%s]: command `%s` failed: %v", name, command, err)
+		}
+
+		executed = true
+	}
+
+	return executed, nil
+}
@@ -0,0 +1,128 @@
+package event
+
+import (
+	"fmt"
+	"os"
+	"testing"
+
+	"github.com/roboll/helmfile/pkg/environment"
+	"github.com/roboll/helmfile/pkg/helmexec"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zaptest/observer"
+)
+
+var logger = helmexec.NewLogger(os.Stdout, "warn")
+
+type runner struct {
+}
+
+func (r *runner) Execute(cmd string, args []string, env map[string]string) ([]byte, error) {
+	if cmd == "ng" {
+		return nil, fmt.Errorf("cmd failed due to invalid cmd: %s", cmd)
+	}
+	for _, a := range args {
+		if a == "ng" {
+			return nil, fmt.Errorf("cmd failed due to invalid arg: %s", a)
+		}
+	}
+	return []byte(""), nil
+}
+
+func TestTrigger(t *testing.T) {
+	cases := []struct {
+		name           string
+		hook           *Hook
+		triggeredEvt   string
+		expectedResult bool
+		expectedErr    string
+	}{
+		{
+			"okhook1",
+			&Hook{"okhook1", []string{"foo"}, "ok", []string{}, true},
+			"foo",
+			true,
+			"",
+		},
+		{
+			"okhooké",
+			&Hook{"okhook2", []string{"foo"}, "ok", []string{}, false},
+			"foo",
+			true,
+			"",
+		},
+		{
+			"missinghook1",
+			&Hook{"okhook1", []string{"foo"}, "ok", []string{}, false},
+			"bar",
+			false,
+			"",
+		},
+		{
+			"nohook1",
+			nil,
+			"bar",
+			false,
+			"",
+		},
+		{
+			"nghook1",
+			&Hook{"nghook1", []string{"foo"}, "ng", []string{}, false},
+			"foo",
+			false,
+			"hook[nghook1]: command `ng` failed: cmd failed due to invalid cmd: ng",
+		},
+		{
+			"nghook2",
+			&Hook{"nghook2", []string{"foo"}, "ok", []string{"ng"}, false},
+			"foo",
+			false,
+			"hook[nghook2]: command `ok` failed: cmd failed due to invalid arg: ng",
+		},
+	}
+	readFile := func(filename string) ([]byte, error) {
+		return nil, fmt.Errorf("unexpected call to readFile: %s", filename)
+	}
+	for _, c := range cases {
+		hooks := []Hook{}
+		if c.hook != nil {
+			hooks = append(hooks, *c.hook)
+		}
+		observer, observedLogs := observer.New(zap.InfoLevel)
+		zeLogger := zap.New(observer).Sugar()
+		bus := &Bus{
+			Hooks:         hooks,
+			StateFilePath: "path/to/helmfile.yaml",
+			BasePath:      "path/to",
+			Namespace:     "myns",
+			Env:           environment.Environment{Name: "prod"},
+			Logger:        zeLogger,
+			ReadFile:      readFile,
+		}
+
+		bus.Runner = &runner{}
+		data := map[string]interface{}{
+			"Release":         "myrel",
+			"HelmfileCommand": "mycmd",
+		}
+		ok, err := bus.Trigger(c.triggeredEvt, nil, data)
+
+		if ok != c.expectedResult {
+			t.Errorf("unexpected result for case \"%s\": expected=%v, actual=%v", c.name, c.expectedResult, ok)
+		}
+
+		if c.expectedErr != "" {
+			if err == nil {
+				t.Error("error expected, but not occurred")
+			} else if err.Error() != c.expectedErr {
+				t.Errorf("unexpected error for case \"%s\": expected=%s, actual=%v", c.name, c.expectedErr, err)
+			}
+		} else {
+			if err != nil {
+				t.Errorf("unexpected error for case \"%s\": %v", c.name, err)
+			}
+		}
+		if observedLogs.Len() != 0 && !hooks[0].ShowLogs {
+			t.Errorf("unexpected error for case \"%s\": Logs should not be created : %v", c.name, observedLogs.All())
+		}
+	}
+}
@@ -0,0 +1,44 @@
+package helmexec
+
+import (
+	"os"
+	"path/filepath"
+)
+
+type HelmContext struct {
+	Tillerless      bool
+	TillerNamespace string
+	WorkerIndex     int
+}
+
+func (context *HelmContext) GetTillerlessArgs(helmBinary string) []string {
+	if context.Tillerless {
+		if context.TillerNamespace != "" {
+			return []string{"tiller", "run", context.TillerNamespace, "--", helmBinary}
+		} else {
+			return []string{"tiller", "run", "--", helmBinary}
+		}
+	} else {
+		return []string{}
+	}
+}
+
+func (context *HelmContext) getTillerlessEnv() map[string]string {
+	if context.Tillerless {
+		result := map[string]string{
+			"HELM_TILLER_SILENT": "true",
+			// Changing the TILLER port doesn't really work: https://github.com/helm/helm/issues/3159
+			// So this is not used for the moment.
+			// "HELM_TILLER_PORT":   strconv.Itoa(44134 + context.WorkerIndex),
+		}
+		if config := os.Getenv("KUBECONFIG"); config != "" {
+			absConfig, err := filepath.Abs(config)
+			if err == nil {
+				result["KUBECONFIG"] = absConfig
+			}
+		}
+		return result
+	} else {
+		return map[string]string{}
+	}
+}
@@ -0,0 +1,321 @@
+package helmexec
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+const (
+	command = "helm"
+)
+
+type decryptedSecret struct {
+	mutex sync.RWMutex
+	bytes []byte
+}
+
+type execer struct {
+	helmBinary           string
+	runner               Runner
+	logger               *zap.SugaredLogger
+	kubeContext          string
+	extra                []string
+	decryptedSecretMutex sync.Mutex
+	decryptedSecrets     map[string]*decryptedSecret
+}
+
+func NewLogger(writer io.Writer, logLevel string) *zap.SugaredLogger {
+	var cfg zapcore.EncoderConfig
+	cfg.MessageKey = "message"
+	out := zapcore.AddSync(writer)
+	var level zapcore.Level
+	err := level.Set(logLevel)
+	if err != nil {
+		panic(err)
+	}
+	core := zapcore.NewCore(
+		zapcore.NewConsoleEncoder(cfg),
+		out,
+		level,
+	)
+	return zap.New(core).Sugar()
+}
+
+// New for running helm commands
+func New(logger *zap.SugaredLogger, kubeContext string, runner Runner) *execer {
+	return &execer{
+		helmBinary:       command,
+		logger:           logger,
+		kubeContext:      kubeContext,
+		runner:           runner,
+		decryptedSecrets: make(map[string]*decryptedSecret),
+	}
+}
+
+func (helm *execer) SetExtraArgs(args ...string) {
+	helm.extra = args
+}
+
+func (helm *execer) SetHelmBinary(bin string) {
+	helm.helmBinary = bin
+}
+
+func (helm *execer) AddRepo(name, repository, cafile, certfile, keyfile, username, password string) error {
+	var args []string
+	args = append(args, "repo", "add", name, repository)
+	if certfile != "" && keyfile != "" {
+		args = append(args, "--cert-file", certfile, "--key-file", keyfile)
+	}
+	if cafile != "" {
+		args = append(args, "--ca-file", cafile)
+	}
+	if username != "" && password != "" {
+		args = append(args, "--username", username, "--password", password)
+	}
+	helm.logger.Infof("Adding repo %v %v", name, repository)
+	out, err := helm.exec(args, map[string]string{})
+	helm.info(out)
+	return err
+}
+
+func (helm *execer) UpdateRepo() error {
+	helm.logger.Info("Updating repo")
+	out, err := helm.exec([]string{"repo", "update"}, map[string]string{})
+	helm.info(out)
+	return err
+}
+
+func (helm *execer) BuildDeps(name, chart string) error {
+	helm.logger.Infof("Building dependency release=%v, chart=%v", name, chart)
+	out, err := helm.exec([]string{"dependency", "build", chart}, map[string]string{})
+	helm.info(out)
+	return err
+}
+
+func (helm *execer) UpdateDeps(chart string) error {
+	helm.logger.Infof("Updating dependency %v", chart)
+	out, err := helm.exec([]string{"dependency", "update", chart}, map[string]string{})
+	helm.info(out)
+	return err
+}
+
+func (helm *execer) SyncRelease(context HelmContext, name, chart string, flags ...string) error {
+	helm.logger.Infof("Upgrading release=%v, chart=%v", name, chart)
+	preArgs := context.GetTillerlessArgs(helm.helmBinary)
+	env := context.getTillerlessEnv()
+	out, err := helm.exec(append(append(preArgs, "upgrade", "--install", "--reset-values", name, chart), flags...), env)
+	helm.write(out)
+	return err
+}
+
+func (helm *execer) ReleaseStatus(context HelmContext, name string, flags ...string) error {
+	helm.logger.Infof("Getting status %v", name)
+	preArgs := context.GetTillerlessArgs(helm.helmBinary)
+	env := context.getTillerlessEnv()
+	out, err := helm.exec(append(append(preArgs, "status", name), flags...), env)
+	helm.write(out)
+	return err
+}
+
+func (helm *execer) List(context HelmContext, filter string, flags ...string) (string, error) {
+	helm.logger.Infof("Listing releases matching %v", filter)
+	preArgs := context.GetTillerlessArgs(helm.helmBinary)
+	env := context.getTillerlessEnv()
+	var args []string
+	if helm.isHelm3() {
+		args = []string{"list", "--filter", filter}
+	} else {
+		args = []string{"list", filter}
+	}
+
+	out, err := helm.exec(append(append(preArgs, args...), flags...), env)
+	helm.write(out)
+	return string(out), err
+}
+
+func (helm *execer) DecryptSecret(context HelmContext, name string, flags ...string) (string, error) {
+	absPath, err := filepath.Abs(name)
+	if err != nil {
+		return "", err
+	}
+
+	helm.logger.Debugf("Preparing to decrypt secret %v", absPath)
+	helm.decryptedSecretMutex.Lock()
+
+	secret, ok := helm.decryptedSecrets[absPath]
+
+	// Cache miss
+	if !ok {
+
+		secret = &decryptedSecret{}
+		helm.decryptedSecrets[absPath] = secret
+
+		secret.mutex.Lock()
+		defer secret.mutex.Unlock()
+		helm.decryptedSecretMutex.Unlock()
+
+		helm.logger.Infof("Decrypting secret %v", absPath)
+		preArgs := context.GetTillerlessArgs(helm.helmBinary)
+		env := context.getTillerlessEnv()
+		out, err := helm.exec(append(append(preArgs, "secrets", "dec", absPath), flags...), env)
+		helm.info(out)
+		if err != nil {
+			return "", err
+		}
+
+		// HELM_SECRETS_DEC_SUFFIX is used by the helm-secrets plugin to define the output file
+		decSuffix := os.Getenv("HELM_SECRETS_DEC_SUFFIX")
+		if len(decSuffix) == 0 {
+			decSuffix = ".yaml.dec"
+		}
+		decFilename := strings.Replace(absPath, ".yaml", decSuffix, 1)
+
+		secretBytes, err := ioutil.ReadFile(decFilename)
+		if err != nil {
+			return "", err
+		}
+		secret.bytes = secretBytes
+
+		if err := os.Remove(decFilename); err != nil {
+			return "", err
+		}
+
+	} else {
+		// Cache hit
+		helm.logger.Debugf("Found secret in cache %v", absPath)
+
+		secret.mutex.RLock()
+		helm.decryptedSecretMutex.Unlock()
+		defer secret.mutex.RUnlock()
+	}
+
+	tmpFile, err := ioutil.TempFile("", "secret")
+	if err != nil {
+		return "", err
+	}
+	_, err = tmpFile.Write(secret.bytes)
+	if err != nil {
+		return "", err
+	}
+
+	return tmpFile.Name(), err
+}
+
+func (helm *execer) TemplateRelease(name string, chart string, flags ...string) error {
+	helm.logger.Infof("Templating release=%v, chart=%v", name, chart)
+	var args []string
+	if helm.isHelm3() {
+		args = []string{"template", name, chart}
+	} else {
+		args = []string{"template", chart, "--name", name}
+	}
+
+	out, err := helm.exec(append(args, flags...), map[string]string{})
+	helm.write(out)
+	return err
+}
+
+func (helm *execer) DiffRelease(context HelmContext, name, chart string, flags ...string) error {
+	helm.logger.Infof("Comparing release=%v, chart=%v", name, chart)
+	preArgs := context.GetTillerlessArgs(helm.helmBinary)
+	env := context.getTillerlessEnv()
+	out, err := helm.exec(append(append(preArgs, "diff", "upgrade", "--reset-values", "--allow-unreleased", name, chart), flags...), env)
+	// Do our best to write STDOUT only when diff existed
+	// Unfortunately, this works only when you run helmfile with `--detailed-exitcode`
+	detailedExitcodeEnabled := false
+	for _, f := range flags {
+		if strings.Contains(f, "detailed-exitcode") {
+			detailedExitcodeEnabled = true
+			break
+		}
+	}
+	if detailedExitcodeEnabled {
+		switch e := err.(type) {
+		case ExitError:
+			if e.ExitStatus() == 2 {
+				helm.write(out)
+				return err
+			}
+		}
+	} else {
+		helm.write(out)
+	}
+	return err
+}
+
+func (helm *execer) Lint(name, chart string, flags ...string) error {
+	helm.logger.Infof("Linting release=%v, chart=%v", name, chart)
+	out, err := helm.exec(append([]string{"lint", chart}, flags...), map[string]string{})
+	helm.write(out)
+	return err
+}
+
+func (helm *execer) Fetch(chart string, flags ...string) error {
+	helm.logger.Infof("Fetching %v", chart)
+	out, err := helm.exec(append([]string{"fetch", chart}, flags...), map[string]string{})
+	helm.info(out)
+	return err
+}
+
+func (helm *execer) DeleteRelease(context HelmContext, name string, flags ...string) error {
+	helm.logger.Infof("Deleting %v", name)
+	preArgs := context.GetTillerlessArgs(helm.helmBinary)
+	env := context.getTillerlessEnv()
+	out, err := helm.exec(append(append(preArgs, "delete", name), flags...), env)
+	helm.write(out)
+	return err
+}
+
+func (helm *execer) TestRelease(context HelmContext, name string, flags ...string) error {
+	helm.logger.Infof("Testing %v", name)
+	preArgs := context.GetTillerlessArgs(helm.helmBinary)
+	env := context.getTillerlessEnv()
+	var args []string
+	if helm.isHelm3() {
+		args = []string{"test", "run", name}
+	} else {
+		args = []string{"test", name}
+	}
+	out, err := helm.exec(append(append(preArgs, args...), flags...), env)
+	helm.write(out)
+	return err
+}
+
+func (helm *execer) exec(args []string, env map[string]string) ([]byte, error) {
+	cmdargs := args
+	if len(helm.extra) > 0 {
+		cmdargs = append(cmdargs, helm.extra...)
+	}
+	if helm.kubeContext != "" {
+		cmdargs = append(cmdargs, "--kube-context", helm.kubeContext)
+	}
+	cmd := fmt.Sprintf("exec: %s %s", helm.helmBinary, strings.Join(cmdargs, " "))
+	helm.logger.Debug(cmd)
+	bytes, err := helm.runner.Execute(helm.helmBinary, cmdargs, env)
+	helm.logger.Debugf("%s: %s", cmd, bytes)
+	return bytes, err
+}
+
+func (helm *execer) info(out []byte) {
+	if len(out) > 0 {
+		helm.logger.Infof("%s", out)
+	}
+}
+
+func (helm *execer) write(out []byte) {
+	if len(out) > 0 {
+		fmt.Printf("%s\n", out)
+	}
+}
+
+func (helm *execer) isHelm3() bool {
+	return os.Getenv("HELMFILE_HELM3") != ""
+}
@@ -0,0 +1,519 @@
+package helmexec
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"path"
+	"path/filepath"
+	"reflect"
+	"testing"
+
+	"go.uber.org/zap"
+)
+
+// Mocking the command-line runner
+
+type mockRunner struct {
+	output []byte
+	err    error
+}
+
+func (mock *mockRunner) Execute(cmd string, args []string, env map[string]string) ([]byte, error) {
+	return []byte{}, nil
+}
+
+func MockExecer(logger *zap.SugaredLogger, kubeContext string) *execer {
+	execer := New(logger, kubeContext, &mockRunner{})
+	return execer
+}
+
+// Test methods
+
+func TestNewHelmExec(t *testing.T) {
+	buffer := bytes.NewBufferString("something")
+	logger := NewLogger(buffer, "debug")
+	helm := New(logger, "dev", &ShellRunner{
+		Logger: logger,
+	})
+	if helm.kubeContext != "dev" {
+		t.Error("helmexec.New() - kubeContext")
+	}
+	if buffer.String() != "something" {
+		t.Error("helmexec.New() - changed buffer")
+	}
+	if len(helm.extra) != 0 {
+		t.Error("helmexec.New() - extra args not empty")
+	}
+}
+
+func Test_SetExtraArgs(t *testing.T) {
+	buffer := bytes.NewBufferString("something")
+	logger := NewLogger(buffer, "debug")
+	helm := New(NewLogger(os.Stdout, "info"), "dev", &ShellRunner{
+		Logger: logger,
+	})
+	helm.SetExtraArgs()
+	if len(helm.extra) != 0 {
+		t.Error("helmexec.SetExtraArgs() - passing no arguments should not change extra field")
+	}
+	helm.SetExtraArgs("foo")
+	if !reflect.DeepEqual(helm.extra, []string{"foo"}) {
+		t.Error("helmexec.SetExtraArgs() - one extra argument missing")
+	}
+	helm.SetExtraArgs("alpha", "beta")
+	if !reflect.DeepEqual(helm.extra, []string{"alpha", "beta"}) {
+		t.Error("helmexec.SetExtraArgs() - two extra arguments missing (overwriting the previous value)")
+	}
+}
+
+func Test_SetHelmBinary(t *testing.T) {
+	buffer := bytes.NewBufferString("something")
+	logger := NewLogger(buffer, "debug")
+	helm := New(NewLogger(os.Stdout, "info"), "dev", &ShellRunner{
+		Logger: logger,
+	})
+	if helm.helmBinary != "helm" {
+		t.Error("helmexec.command - default command is not helm")
+	}
+	helm.SetHelmBinary("foo")
+	if helm.helmBinary != "foo" {
+		t.Errorf("helmexec.SetHelmBinary() - actual = %s expect = foo", helm.helmBinary)
+	}
+}
+
+func Test_AddRepo(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "dev")
+	helm.AddRepo("myRepo", "https://repo.example.com/", "", "cert.pem", "key.pem", "", "")
+	expected := `Adding repo myRepo https://repo.example.com/
+exec: helm repo add myRepo https://repo.example.com/ --cert-file cert.pem --key-file key.pem --kube-context dev
+exec: helm repo add myRepo https://repo.example.com/ --cert-file cert.pem --key-file key.pem --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.AddRepo()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+
+	buffer.Reset()
+	helm.AddRepo("myRepo", "https://repo.example.com/", "ca.crt", "", "", "", "")
+	expected = `Adding repo myRepo https://repo.example.com/
+exec: helm repo add myRepo https://repo.example.com/ --ca-file ca.crt --kube-context dev
+exec: helm repo add myRepo https://repo.example.com/ --ca-file ca.crt --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.AddRepo()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+
+	buffer.Reset()
+	helm.AddRepo("myRepo", "https://repo.example.com/", "", "", "", "", "")
+	expected = `Adding repo myRepo https://repo.example.com/
+exec: helm repo add myRepo https://repo.example.com/ --kube-context dev
+exec: helm repo add myRepo https://repo.example.com/ --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.AddRepo()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+
+	buffer.Reset()
+	helm.AddRepo("myRepo", "https://repo.example.com/", "", "", "", "example_user", "example_password")
+	expected = `Adding repo myRepo https://repo.example.com/
+exec: helm repo add myRepo https://repo.example.com/ --username example_user --password example_password --kube-context dev
+exec: helm repo add myRepo https://repo.example.com/ --username example_user --password example_password --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.AddRepo()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
+
+func Test_UpdateRepo(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "dev")
+	helm.UpdateRepo()
+	expected := `Updating repo
+exec: helm repo update --kube-context dev
+exec: helm repo update --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.UpdateRepo()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
+
+func Test_SyncRelease(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "dev")
+	helm.SyncRelease(HelmContext{}, "release", "chart", "--timeout 10", "--wait")
+	expected := `Upgrading release=release, chart=chart
+exec: helm upgrade --install --reset-values release chart --timeout 10 --wait --kube-context dev
+exec: helm upgrade --install --reset-values release chart --timeout 10 --wait --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.SyncRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+
+	buffer.Reset()
+	helm.SyncRelease(HelmContext{}, "release", "chart")
+	expected = `Upgrading release=release, chart=chart
+exec: helm upgrade --install --reset-values release chart --kube-context dev
+exec: helm upgrade --install --reset-values release chart --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.SyncRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
+
+func Test_SyncReleaseTillerless(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "dev")
+	helm.SyncRelease(HelmContext{Tillerless: true, TillerNamespace: "foo"}, "release", "chart",
+		"--timeout 10", "--wait")
+	expected := `Upgrading release=release, chart=chart
+exec: helm tiller run foo -- helm upgrade --install --reset-values release chart --timeout 10 --wait --kube-context dev
+exec: helm tiller run foo -- helm upgrade --install --reset-values release chart --timeout 10 --wait --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.SyncRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
+
+func Test_UpdateDeps(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "dev")
+	helm.UpdateDeps("./chart/foo")
+	expected := `Updating dependency ./chart/foo
+exec: helm dependency update ./chart/foo --kube-context dev
+exec: helm dependency update ./chart/foo --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.UpdateDeps()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+
+	buffer.Reset()
+	helm.SetExtraArgs("--verify")
+	helm.UpdateDeps("./chart/foo")
+	expected = `Updating dependency ./chart/foo
+exec: helm dependency update ./chart/foo --verify --kube-context dev
+exec: helm dependency update ./chart/foo --verify --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.AddRepo()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
+
+func Test_BuildDeps(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "dev")
+	helm.BuildDeps("foo", "./chart/foo")
+	expected := `Building dependency release=foo, chart=./chart/foo
+exec: helm dependency build ./chart/foo --kube-context dev
+exec: helm dependency build ./chart/foo --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.BuildDeps()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+
+	buffer.Reset()
+	helm.SetExtraArgs("--verify")
+	helm.BuildDeps("foo", "./chart/foo")
+	expected = `Building dependency release=foo, chart=./chart/foo
+exec: helm dependency build ./chart/foo --verify --kube-context dev
+exec: helm dependency build ./chart/foo --verify --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.BuildDeps()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
+
+func Test_DecryptSecret(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "dev")
+	helm.DecryptSecret(HelmContext{}, "secretName")
+	cwd, err := filepath.Abs(".")
+	if err != nil {
+		t.Errorf("Error: %v", err)
+	}
+	// Run again for caching
+	helm.DecryptSecret(HelmContext{}, "secretName")
+
+	expected := fmt.Sprintf(`Preparing to decrypt secret %v/secretName
+Decrypting secret %s/secretName
+exec: helm secrets dec %s/secretName --kube-context dev
+exec: helm secrets dec %s/secretName --kube-context dev: 
+Preparing to decrypt secret %s/secretName
+Found secret in cache %s/secretName
+`, cwd, cwd, cwd, cwd, cwd, cwd)
+	if buffer.String() != expected {
+		t.Errorf("helmexec.DecryptSecret()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
+
+func Test_DiffRelease(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "dev")
+	helm.DiffRelease(HelmContext{}, "release", "chart", "--timeout 10", "--wait")
+	expected := `Comparing release=release, chart=chart
+exec: helm diff upgrade --reset-values --allow-unreleased release chart --timeout 10 --wait --kube-context dev
+exec: helm diff upgrade --reset-values --allow-unreleased release chart --timeout 10 --wait --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.DiffRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+
+	buffer.Reset()
+	helm.DiffRelease(HelmContext{}, "release", "chart")
+	expected = `Comparing release=release, chart=chart
+exec: helm diff upgrade --reset-values --allow-unreleased release chart --kube-context dev
+exec: helm diff upgrade --reset-values --allow-unreleased release chart --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.DiffRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
+
+func Test_DiffReleaseTillerless(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "dev")
+	helm.DiffRelease(HelmContext{Tillerless: true}, "release", "chart", "--timeout 10", "--wait")
+	expected := `Comparing release=release, chart=chart
+exec: helm tiller run -- helm diff upgrade --reset-values --allow-unreleased release chart --timeout 10 --wait --kube-context dev
+exec: helm tiller run -- helm diff upgrade --reset-values --allow-unreleased release chart --timeout 10 --wait --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.DiffRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
+
+func Test_DeleteRelease(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "dev")
+	helm.DeleteRelease(HelmContext{}, "release")
+	expected := `Deleting release
+exec: helm delete release --kube-context dev
+exec: helm delete release --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.DeleteRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
+func Test_DeleteRelease_Flags(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "dev")
+	helm.DeleteRelease(HelmContext{}, "release", "--purge")
+	expected := `Deleting release
+exec: helm delete release --purge --kube-context dev
+exec: helm delete release --purge --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.DeleteRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
+
+func Test_TestRelease(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "dev")
+	helm.TestRelease(HelmContext{}, "release")
+	expected := `Testing release
+exec: helm test release --kube-context dev
+exec: helm test release --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.TestRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
+func Test_TestRelease_Flags(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "dev")
+	helm.TestRelease(HelmContext{}, "release", "--cleanup", "--timeout", "60")
+	expected := `Testing release
+exec: helm test release --cleanup --timeout 60 --kube-context dev
+exec: helm test release --cleanup --timeout 60 --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.TestRelease()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
+
+func Test_ReleaseStatus(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "dev")
+	helm.ReleaseStatus(HelmContext{}, "myRelease")
+	expected := `Getting status myRelease
+exec: helm status myRelease --kube-context dev
+exec: helm status myRelease --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.ReleaseStatus()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
+
+func Test_exec(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "")
+	env := map[string]string{}
+	helm.exec([]string{"version"}, env)
+	expected := `exec: helm version
+exec: helm version: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.exec()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+
+	helm = MockExecer(logger, "dev")
+	ret, _ := helm.exec([]string{"diff"}, env)
+	if len(ret) != 0 {
+		t.Error("helmexec.exec() - expected empty return value")
+	}
+
+	buffer.Reset()
+	helm = MockExecer(logger, "dev")
+	helm.exec([]string{"diff", "release", "chart", "--timeout 10", "--wait"}, env)
+	expected = `exec: helm diff release chart --timeout 10 --wait --kube-context dev
+exec: helm diff release chart --timeout 10 --wait --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.exec()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+
+	buffer.Reset()
+	helm.exec([]string{"version"}, env)
+	expected = `exec: helm version --kube-context dev
+exec: helm version --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.exec()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+
+	buffer.Reset()
+	helm.SetExtraArgs("foo")
+	helm.exec([]string{"version"}, env)
+	expected = `exec: helm version foo --kube-context dev
+exec: helm version foo --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.exec()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+
+	buffer.Reset()
+	helm = MockExecer(logger, "")
+	helm.SetHelmBinary("overwritten")
+	helm.exec([]string{"version"}, env)
+	expected = `exec: overwritten version
+exec: overwritten version: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.exec()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
+
+func Test_Lint(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "dev")
+	helm.Lint("release", "path/to/chart", "--values", "file.yml")
+	expected := `Linting release=release, chart=path/to/chart
+exec: helm lint path/to/chart --values file.yml --kube-context dev
+exec: helm lint path/to/chart --values file.yml --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.Lint()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
+
+func Test_Fetch(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "dev")
+	helm.Fetch("chart", "--version", "1.2.3", "--untar", "--untardir", "/tmp/dir")
+	expected := `Fetching chart
+exec: helm fetch chart --version 1.2.3 --untar --untardir /tmp/dir --kube-context dev
+exec: helm fetch chart --version 1.2.3 --untar --untardir /tmp/dir --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.Lint()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
+
+var logLevelTests = map[string]string{
+	"debug": `Adding repo myRepo https://repo.example.com/
+exec: helm repo add myRepo https://repo.example.com/ --username example_user --password example_password
+exec: helm repo add myRepo https://repo.example.com/ --username example_user --password example_password: 
+`,
+	"info": `Adding repo myRepo https://repo.example.com/
+`,
+	"warn": ``,
+}
+
+func Test_LogLevels(t *testing.T) {
+	var buffer bytes.Buffer
+	for logLevel, expected := range logLevelTests {
+		buffer.Reset()
+		logger := NewLogger(&buffer, logLevel)
+		helm := MockExecer(logger, "")
+		helm.AddRepo("myRepo", "https://repo.example.com/", "", "", "", "example_user", "example_password")
+		if buffer.String() != expected {
+			t.Errorf("helmexec.AddRepo()\nactual = %v\nexpect = %v", buffer.String(), expected)
+		}
+	}
+}
+
+func Test_getTillerlessEnv(t *testing.T) {
+	context := HelmContext{Tillerless: true, TillerNamespace: "foo", WorkerIndex: 1}
+
+	os.Unsetenv("KUBECONFIG")
+	actual := context.getTillerlessEnv()
+	if val, found := actual["HELM_TILLER_SILENT"]; !found || val != "true" {
+		t.Errorf("getTillerlessEnv() HELM_TILLER_SILENT\nactual = %s\nexpect = true", val)
+	}
+	// This feature is disabled until it is fixed in helm
+	/*if val, found := actual["HELM_TILLER_PORT"]; !found || val != "44135" {
+		t.Errorf("getTillerlessEnv() HELM_TILLER_PORT\nactual = %s\nexpect = 44135", val)
+	}*/
+	if val, found := actual["KUBECONFIG"]; found {
+		t.Errorf("getTillerlessEnv() KUBECONFIG\nactual = %s\nexpect = nil", val)
+	}
+
+	os.Setenv("KUBECONFIG", "toto")
+	actual = context.getTillerlessEnv()
+	cwd, _ := os.Getwd()
+	expected := path.Join(cwd, "toto")
+	if val, found := actual["KUBECONFIG"]; !found || val != expected {
+		t.Errorf("getTillerlessEnv() KUBECONFIG\nactual = %s\nexpect = %s", val, expected)
+	}
+	os.Unsetenv("KUBECONFIG")
+}
+
+func Test_mergeEnv(t *testing.T) {
+	actual := env2map(mergeEnv([]string{"A=1", "B=c=d", "E=2"}, map[string]string{"B": "3", "F": "4"}))
+	expected := map[string]string{"A": "1", "B": "3", "E": "2", "F": "4"}
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("mergeEnv()\nactual = %v\nexpect = %v", actual, expected)
+	}
+}
+
+func Test_Template(t *testing.T) {
+	var buffer bytes.Buffer
+	logger := NewLogger(&buffer, "debug")
+	helm := MockExecer(logger, "dev")
+	helm.TemplateRelease("release", "path/to/chart", "--values", "file.yml")
+	expected := `Templating release=release, chart=path/to/chart
+exec: helm template path/to/chart --name release --values file.yml --kube-context dev
+exec: helm template path/to/chart --name release --values file.yml --kube-context dev: 
+`
+	if buffer.String() != expected {
+		t.Errorf("helmexec.Template()\nactual = %v\nexpect = %v", buffer.String(), expected)
+	}
+}
@@ -0,0 +1,36 @@
+package helmexec
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+)
+
+func newExitError(helmCmdPath string, exitStatus int, errorMessage string) ExitError {
+	return ExitError{
+		msg:        fmt.Sprintf("%s exited with status %d:\n%s", filepath.Base(helmCmdPath), exitStatus, indent(strings.TrimSpace(errorMessage))),
+		exitStatus: exitStatus,
+	}
+}
+
+func indent(text string) string {
+	lines := strings.Split(text, "\n")
+	for i := range lines {
+		lines[i] = "  " + lines[i]
+	}
+	return strings.Join(lines, "\n")
+}
+
+// ExitError is created whenever your shell command exits with a non-zero exit status
+type ExitError struct {
+	msg        string
+	exitStatus int
+}
+
+func (e ExitError) Error() string {
+	return e.msg
+}
+
+func (e ExitError) ExitStatus() int {
+	return e.exitStatus
+}
@@ -0,0 +1,26 @@
+package helmexec
+
+// Interface for executing helm commands
+type Interface interface {
+	SetExtraArgs(args ...string)
+	SetHelmBinary(bin string)
+
+	AddRepo(name, repository, cafile, certfile, keyfile, username, password string) error
+	UpdateRepo() error
+	BuildDeps(name, chart string) error
+	UpdateDeps(chart string) error
+	SyncRelease(context HelmContext, name, chart string, flags ...string) error
+	DiffRelease(context HelmContext, name, chart string, flags ...string) error
+	TemplateRelease(name, chart string, flags ...string) error
+	Fetch(chart string, flags ...string) error
+	Lint(name, chart string, flags ...string) error
+	ReleaseStatus(context HelmContext, name string, flags ...string) error
+	DeleteRelease(context HelmContext, name string, flags ...string) error
+	TestRelease(context HelmContext, name string, flags ...string) error
+	List(context HelmContext, filter string, flags ...string) (string, error)
+	DecryptSecret(context HelmContext, name string, flags ...string) (string, error)
+}
+
+type DependencyUpdater interface {
+	UpdateDeps(chart string) error
+}
@@ -0,0 +1,99 @@
+package helmexec
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"go.uber.org/zap"
+	"os"
+	"os/exec"
+	"strings"
+	"syscall"
+)
+
+const (
+	tmpPrefix = "helmfile-"
+	tmpSuffix = "-exec"
+)
+
+// Runner interface for shell commands
+type Runner interface {
+	Execute(cmd string, args []string, env map[string]string) ([]byte, error)
+}
+
+// ShellRunner implemention for shell commands
+type ShellRunner struct {
+	Dir string
+
+	Logger *zap.SugaredLogger
+}
+
+// Execute a shell command
+func (shell ShellRunner) Execute(cmd string, args []string, env map[string]string) ([]byte, error) {
+	preparedCmd := exec.Command(cmd, args...)
+	preparedCmd.Dir = shell.Dir
+	preparedCmd.Env = mergeEnv(os.Environ(), env)
+	return combinedOutput(preparedCmd, shell.Logger)
+}
+
+func combinedOutput(c *exec.Cmd, logger *zap.SugaredLogger) ([]byte, error) {
+	if c.Stdout != nil {
+		return nil, errors.New("exec: Stdout already set")
+	}
+	if c.Stderr != nil {
+		return nil, errors.New("exec: Stderr already set")
+	}
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+	c.Stdout = &stdout
+	c.Stderr = &stderr
+	err := c.Run()
+
+	o := stdout.Bytes()
+	e := stderr.Bytes()
+
+	if err != nil {
+		// TrimSpace is necessary, because otherwise helmfile prints the redundant new-lines after each error like:
+		//
+		//   err: release "envoy2" in "helmfile.yaml" failed: exit status 1: Error: could not find a ready tiller pod
+		//   <redundant new line!>
+		//   err: release "envoy" in "helmfile.yaml" failed: exit status 1: Error: could not find a ready tiller pod
+		switch ee := err.(type) {
+		case *exec.ExitError:
+			// Propagate any non-zero exit status from the external command, rather than throwing it away,
+			// so that helmfile could return its own exit code accordingly
+			waitStatus := ee.Sys().(syscall.WaitStatus)
+			exitStatus := waitStatus.ExitStatus()
+			err = newExitError(c.Path, exitStatus, string(e))
+		default:
+			panic(fmt.Sprintf("unexpected error: %v", err))
+		}
+	}
+
+	return o, err
+}
+
+func mergeEnv(orig []string, new map[string]string) []string {
+	wanted := env2map(orig)
+	for k, v := range new {
+		wanted[k] = v
+	}
+	return map2env(wanted)
+}
+
+func map2env(wanted map[string]string) []string {
+	result := []string{}
+	for k, v := range wanted {
+		result = append(result, k+"="+v)
+	}
+	return result
+}
+
+func env2map(env []string) map[string]string {
+	wanted := map[string]string{}
+	for _, cur := range env {
+		pair := strings.SplitN(cur, "=", 2)
+		wanted[pair[0]] = pair[1]
+	}
+	return wanted
+}
@@ -0,0 +1,91 @@
+package maputil
+
+import "fmt"
+
+func CastKeysToStrings(s interface{}) (map[string]interface{}, error) {
+	new := map[string]interface{}{}
+	switch src := s.(type) {
+	case map[interface{}]interface{}:
+		for k, v := range src {
+			var str_k string
+			switch typed_k := k.(type) {
+			case string:
+				str_k = typed_k
+			default:
+				return nil, fmt.Errorf("unexpected type of key in map: expected string, got %T: value=%v, map=%v", typed_k, typed_k, src)
+			}
+
+			casted_v, err := recursivelyStringifyMapKey(v)
+			if err != nil {
+				return nil, err
+			}
+
+			new[str_k] = casted_v
+		}
+	case map[string]interface{}:
+		for k, v := range src {
+			casted_v, err := recursivelyStringifyMapKey(v)
+			if err != nil {
+				return nil, err
+			}
+
+			new[k] = casted_v
+		}
+	}
+	return new, nil
+}
+
+func recursivelyStringifyMapKey(v interface{}) (interface{}, error) {
+	var casted_v interface{}
+	switch typed_v := v.(type) {
+	case map[interface{}]interface{}, map[string]interface{}:
+		tmp, err := CastKeysToStrings(typed_v)
+		if err != nil {
+			return nil, err
+		}
+		casted_v = tmp
+	case []interface{}:
+		a := []interface{}{}
+		for i := range typed_v {
+			res, err := recursivelyStringifyMapKey(typed_v[i])
+			if err != nil {
+				return nil, err
+			}
+			a = append(a, res)
+		}
+		casted_v = a
+	default:
+		casted_v = typed_v
+	}
+	return casted_v, nil
+}
+
+func Set(m map[string]interface{}, key []string, value string) map[string]interface{} {
+	if len(key) == 0 {
+		panic(fmt.Errorf("bug: unexpected length of key: %d", len(key)))
+	}
+
+	k := key[0]
+
+	if len(key) == 1 {
+		m[k] = value
+		return m
+	}
+
+	remain := key[1:]
+
+	nested, ok := m[k]
+	if !ok {
+		nested = map[string]interface{}{}
+	}
+	switch t := nested.(type) {
+	case map[string]interface{}:
+		nested = Set(t, remain, value)
+	default:
+		panic(fmt.Errorf("unexpected type: %v(%T)", t, t))
+	}
+
+	m[k] = nested
+
+	return m
+}
@@ -0,0 +1,61 @@
+package maputil
+
+import "testing"
+
+func TestMapUtil_StrKeys(t *testing.T) {
+	m := map[string]interface{}{
+		"a": []interface{}{
+			map[string]interface{}{
+				"b": []interface{}{
+					map[string]interface{}{
+						"c": "C",
+					},
+				},
+			},
+		},
+	}
+
+	r, err := CastKeysToStrings(m)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	a := r["a"].([]interface{})
+	a0 := a[0].(map[string]interface{})
+	b := a0["b"].([]interface{})
+	b0 := b[0].(map[string]interface{})
+	c := b0["c"]
+
+	if c != "C" {
+		t.Errorf("unexpected c: expected=C, got=%s", c)
+	}
+}
+
+func TestMapUtil_IFKeys(t *testing.T) {
+	m := map[interface{}]interface{}{
+		"a": []interface{}{
+			map[interface{}]interface{}{
+				"b": []interface{}{
+					map[interface{}]interface{}{
+						"c": "C",
+					},
+				},
+			},
+		},
+	}
+
+	r, err := CastKeysToStrings(m)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	a := r["a"].([]interface{})
+	a0 := a[0].(map[string]interface{})
+	b := a0["b"].([]interface{})
+	b0 := b[0].(map[string]interface{})
+	c := b0["c"]
+
+	if c != "C" {
+		t.Errorf("unexpected c: expected=C, got=%s", c)
+	}
+}
@@ -0,0 +1,262 @@
+package remote
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"github.com/hashicorp/go-getter"
+	"github.com/hashicorp/go-getter/helper/url"
+	"go.uber.org/multierr"
+	"go.uber.org/zap"
+	"gopkg.in/yaml.v2"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+const DefaultCacheDir = ".helmfile/cache"
+
+type Remote struct {
+	Logger *zap.SugaredLogger
+
+	// Home is the home directory for helmfile. Usually this points to $HOME of the user running helmfile.
+	// Helmfile saves fetched remote files into .helmfile/cache under home
+	Home string
+
+	// Getter is the underlying implementation of getter used for fetching remote files
+	Getter Getter
+
+	// ReadFile is the implementation of the file reader that reads a local file from the specified path.
+	// Inject any implementation of your choice, like an im-memory impl for testing, ioutil.ReadFile for the real-world use.
+	ReadFile   func(string) ([]byte, error)
+	DirExists  func(string) bool
+	FileExists func(string) bool
+}
+
+func (r *Remote) Unmarshal(src string, dst interface{}) error {
+	bytes, err := r.GetBytes(src)
+	if err != nil {
+		return err
+	}
+
+	strs := strings.Split(src, "/")
+	file := strs[len(strs)-1]
+	ext := filepath.Ext(file)
+
+	{
+		r.Logger.Debugf("unmarshalling %s", string(bytes))
+
+		var err error
+		switch ext {
+		case "json":
+			err = json.Unmarshal(bytes, dst)
+		default:
+			err = yaml.Unmarshal(bytes, dst)
+		}
+
+		r.Logger.Debugf("unmarshalled to %v", dst)
+
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (r *Remote) GetBytes(goGetterSrc string) ([]byte, error) {
+	f, err := r.Fetch(goGetterSrc)
+	if err != nil {
+		return nil, err
+	}
+
+	bytes, err := r.ReadFile(f)
+	if err != nil {
+		return nil, fmt.Errorf("read file: %v", err)
+	}
+
+	return bytes, nil
+}
+
+// Locate takes an URL to a remote file or a path to a local file.
+// If the argument was an URL, it fetches the remote directory contained within the URL,
+// and returns the path to the file in the fetched directory
+func (r *Remote) Locate(urlOrPath string) (string, error) {
+	if r.FileExists(urlOrPath) || r.DirExists(urlOrPath) {
+		return urlOrPath, nil
+	}
+	fetched, err := r.Fetch(urlOrPath)
+	if err != nil {
+		switch err.(type) {
+		case InvalidURLError:
+			return urlOrPath, nil
+		}
+		return "", err
+	}
+	return fetched, nil
+}
+
+type InvalidURLError struct {
+	err string
+}
+
+func (e InvalidURLError) Error() string {
+	return e.err
+}
+
+type Source struct {
+	Getter, Scheme, User, Host, Dir, File, RawQuery string
+}
+
+func IsRemote(goGetterSrc string) bool {
+	if _, err := Parse(goGetterSrc); err != nil {
+		return false
+	}
+	return true
+}
+
+func Parse(goGetterSrc string) (*Source, error) {
+	items := strings.Split(goGetterSrc, "::")
+	var getter string
+	switch len(items) {
+	case 2:
+		getter = items[0]
+		goGetterSrc = items[1]
+	}
+
+	u, err := url.Parse(goGetterSrc)
+	if err != nil {
+		return nil, InvalidURLError{err: fmt.Sprintf("parse url: %v", err)}
+	}
+
+	if u.Scheme == "" {
+		return nil, InvalidURLError{err: fmt.Sprintf("parse url: missing scheme - probably this is a local file path? %s", goGetterSrc)}
+	}
+
+	pathComponents := strings.Split(u.Path, "@")
+	if len(pathComponents) != 2 {
+		return nil, fmt.Errorf("invalid src format: it must be `[<getter>::]<scheme>://<host>/<path/to/dir>@<path/to/file>?key1=val1&key2=val2: got %s", goGetterSrc)
+	}
+
+	return &Source{
+		Getter:   getter,
+		User:     u.User.String(),
+		Scheme:   u.Scheme,
+		Host:     u.Host,
+		Dir:      pathComponents[0],
+		File:     pathComponents[1],
+		RawQuery: u.RawQuery,
+	}, nil
+}
+
+func (r *Remote) Fetch(goGetterSrc string) (string, error) {
+	u, err := Parse(goGetterSrc)
+	if err != nil {
+		return "", err
+	}
+
+	srcDir := fmt.Sprintf("%s://%s%s", u.Scheme, u.Host, u.Dir)
+	file := u.File
+
+	r.Logger.Debugf("getter: %s", u.Getter)
+	r.Logger.Debugf("scheme: %s", u.Scheme)
+	r.Logger.Debugf("user: %s", u.User)
+	r.Logger.Debugf("host: %s", u.Host)
+	r.Logger.Debugf("dir: %s", u.Dir)
+	r.Logger.Debugf("file: %s", u.File)
+
+	// This should be shared across variant commands, so that they can share cache for the shared imports
+	cacheBaseDir := DefaultCacheDir
+
+	query := u.RawQuery
+
+	var cacheKey string
+	replacer := strings.NewReplacer(":", "", "//", "_", "/", "_", ".", "_")
+	dirKey := replacer.Replace(srcDir)
+	if len(query) > 0 {
+		paramsKey := strings.Replace(query, "&", "_", -1)
+		cacheKey = fmt.Sprintf("%s.%s", dirKey, paramsKey)
+	} else {
+		cacheKey = dirKey
+	}
+
+	cached := false
+
+	// e.g. .helmfile/cache/https_github_com_cloudposse_helmfiles_git.ref=0.xx.0
+	getterDst := filepath.Join(cacheBaseDir, cacheKey)
+
+	// e.g. $PWD/.helmfile/cache/https_github_com_cloudposse_helmfiles_git.ref=0.xx.0
+	cacheDirPath := filepath.Join(r.Home, getterDst)
+
+	r.Logger.Debugf("home: %s", r.Home)
+	r.Logger.Debugf("getter dest: %s", getterDst)
+	r.Logger.Debugf("cached dir: %s", cacheDirPath)
+
+	{
+		if r.FileExists(cacheDirPath) {
+			return "", fmt.Errorf("%s is not directory. please remove it so that variant could use it for dependency caching", getterDst)
+		}
+
+		if r.DirExists(cacheDirPath) {
+			cached = true
+		}
+	}
+
+	if !cached {
+		var getterSrc string
+		if u.User != "" {
+			getterSrc = fmt.Sprintf("%s://%s@%s%s", u.Scheme, u.User, u.Host, u.Dir)
+		} else {
+			getterSrc = fmt.Sprintf("%s://%s%s", u.Scheme, u.Host, u.Dir)
+		}
+
+		if len(query) > 0 {
+			getterSrc = strings.Join([]string{getterSrc, query}, "?")
+		}
+
+		if u.Getter != "" {
+			getterSrc = u.Getter + "::" + getterSrc
+		}
+
+		r.Logger.Debugf("downloading %s to %s", getterSrc, getterDst)
+
+		if err := r.Getter.Get(r.Home, getterSrc, cacheDirPath); err != nil {
+			rmerr := os.RemoveAll(cacheDirPath)
+			if rmerr != nil {
+				return "", multierr.Append(err, rmerr)
+			}
+			return "", err
+		}
+	}
+
+	return filepath.Join(cacheDirPath, file), nil
+}
+
+type Getter interface {
+	Get(wd, src, dst string) error
+}
+
+type GoGetter struct {
+	Logger *zap.SugaredLogger
+}
+
+func (g *GoGetter) Get(wd, src, dst string) error {
+	ctx := context.Background()
+
+	get := &getter.Client{
+		Ctx:     ctx,
+		Src:     src,
+		Dst:     dst,
+		Pwd:     wd,
+		Mode:    getter.ClientModeDir,
+		Options: []getter.ClientOption{},
+	}
+
+	g.Logger.Debugf("client: %+v", *get)
+
+	if err := get.Get(); err != nil {
+		return fmt.Errorf("get: %v", err)
+	}
+
+	return nil
+}
@@ -0,0 +1,165 @@
+package remote
+
+import (
+	"fmt"
+	"github.com/roboll/helmfile/pkg/helmexec"
+	"github.com/roboll/helmfile/pkg/testhelper"
+	"os"
+	"testing"
+)
+
+func TestRemote_HttpsGitHub(t *testing.T) {
+	cleanfs := map[string]string{
+		"path/to/home": "",
+	}
+	cachefs := map[string]string{
+		"path/to/home/.helmfile/cache/https_github_com_cloudposse_helmfiles_git.ref=0.40.0/releases/kiam.yaml": "foo: bar",
+	}
+
+	type testcase struct {
+		files          map[string]string
+		expectCacheHit bool
+	}
+
+	testcases := []testcase{
+		{files: cleanfs, expectCacheHit: false},
+		{files: cachefs, expectCacheHit: true},
+	}
+
+	for i := range testcases {
+		testcase := testcases[i]
+
+		t.Run(fmt.Sprintf("case %d", i), func(t *testing.T) {
+			testfs := testhelper.NewTestFs(testcase.files)
+
+			hit := true
+
+			get := func(wd, src, dst string) error {
+				if wd != "path/to/home" {
+					return fmt.Errorf("unexpected wd: %s", wd)
+				}
+				if src != "git::https://github.com/cloudposse/helmfiles.git?ref=0.40.0" {
+					return fmt.Errorf("unexpected src: %s", src)
+				}
+
+				hit = false
+
+				return nil
+			}
+
+			getter := &testGetter{
+				get: get,
+			}
+			remote := &Remote{
+				Logger:     helmexec.NewLogger(os.Stderr, "debug"),
+				Home:       "path/to/home",
+				Getter:     getter,
+				ReadFile:   testfs.ReadFile,
+				FileExists: testfs.FileExistsAt,
+				DirExists:  testfs.DirectoryExistsAt,
+			}
+
+			// FYI, go-getter in the `dir` mode accepts URL like the below. So helmfile expects URLs similar to it:
+			//   go-getter -mode dir git::https://github.com/cloudposse/helmfiles.git?ref=0.40.0 gettertest1/b
+
+			// We use `@` to separate dir and the file path. This is a good idea borrowed from helm-git:
+			//   https://github.com/aslafy-z/helm-git
+
+			url := "git::https://github.com/cloudposse/helmfiles.git@releases/kiam.yaml?ref=0.40.0"
+			file, err := remote.Locate(url)
+			if err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+
+			if file != "path/to/home/.helmfile/cache/https_github_com_cloudposse_helmfiles_git.ref=0.40.0/releases/kiam.yaml" {
+				t.Errorf("unexpected file located: %s", file)
+			}
+
+			if testcase.expectCacheHit && !hit {
+				t.Errorf("unexpected result: unexpected cache miss")
+			}
+			if !testcase.expectCacheHit && hit {
+				t.Errorf("unexpected result: unexpected cache hit")
+			}
+		})
+	}
+}
+
+func TestRemote_SShGitHub(t *testing.T) {
+	cleanfs := map[string]string{
+		"path/to/home": "",
+	}
+	cachefs := map[string]string{
+		"path/to/home/.helmfile/cache/ssh_github_com_cloudposse_helmfiles_git.ref=0.40.0/releases/kiam.yaml": "foo: bar",
+	}
+
+	type testcase struct {
+		files          map[string]string
+		expectCacheHit bool
+	}
+
+	testcases := []testcase{
+		{files: cleanfs, expectCacheHit: false},
+		{files: cachefs, expectCacheHit: true},
+	}
+
+	for i := range testcases {
+		testcase := testcases[i]
+
+		t.Run(fmt.Sprintf("case %d", i), func(t *testing.T) {
+			testfs := testhelper.NewTestFs(testcase.files)
+
+			hit := true
+
+			get := func(wd, src, dst string) error {
+				if wd != "path/to/home" {
+					return fmt.Errorf("unexpected wd: %s", wd)
+				}
+				if src != "git::ssh://git@github.com/cloudposse/helmfiles.git?ref=0.40.0" {
+					return fmt.Errorf("unexpected src: %s", src)
+				}
+
+				hit = false
+
+				return nil
+			}
+
+			getter := &testGetter{
+				get: get,
+			}
+			remote := &Remote{
+				Logger:     helmexec.NewLogger(os.Stderr, "debug"),
+				Home:       "path/to/home",
+				Getter:     getter,
+				ReadFile:   testfs.ReadFile,
+				FileExists: testfs.FileExistsAt,
+				DirExists:  testfs.DirectoryExistsAt,
+			}
+
+			url := "git::ssh://git@github.com/cloudposse/helmfiles.git@releases/kiam.yaml?ref=0.40.0"
+			file, err := remote.Locate(url)
+			if err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+
+			if file != "path/to/home/.helmfile/cache/ssh_github_com_cloudposse_helmfiles_git.ref=0.40.0/releases/kiam.yaml" {
+				t.Errorf("unexpected file located: %s", file)
+			}
+
+			if testcase.expectCacheHit && !hit {
+				t.Errorf("unexpected result: unexpected cache miss")
+			}
+			if !testcase.expectCacheHit && hit {
+				t.Errorf("unexpected result: unexpected cache hit")
+			}
+		})
+	}
+}
+
+type testGetter struct {
+	get func(wd, src, dst string) error
+}
+
+func (t *testGetter) Get(wd, src, dst string) error {
+	return t.get(wd, src, dst)
+}
@@ -0,0 +1,433 @@
+package state
+
+import (
+	"fmt"
+	"github.com/Masterminds/semver"
+	"github.com/r3labs/diff"
+	"github.com/roboll/helmfile/pkg/helmexec"
+	"go.uber.org/zap"
+	"gopkg.in/yaml.v2"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+)
+
+type ChartMeta struct {
+	Name string `yaml:"name"`
+}
+
+type unresolvedChartDependency struct {
+	// ChartName identifies the dependant chart. In Helmfile, ChartName for `chart: stable/envoy` would be just `envoy`.
+	// It can't be collided with other charts referenced in the same helmfile spec.
+	// That is, collocating `chart: incubator/foo` and `chart: stable/foo` isn't allowed. Name them differently for a work-around.
+	ChartName string `yaml:"name"`
+	// Repository contains the URL for the helm chart repository that hosts the chart identified by ChartName
+	Repository string `yaml:"repository"`
+	// VersionConstraint is the version constraint of the dependent chart. "*" means the latest version.
+	VersionConstraint string `yaml:"version"`
+}
+
+type ResolvedChartDependency struct {
+	// ChartName identifies the dependant chart. In Helmfile, ChartName for `chart: stable/envoy` would be just `envoy`.
+	// It can't be collided with other charts referenced in the same helmfile spec.
+	// That is, collocating `chart: incubator/foo` and `chart: stable/foo` isn't allowed. Name them differently for a work-around.
+	ChartName string `yaml:"name"`
+	// Repository contains the URL for the helm chart repository that hosts the chart identified by ChartName
+	Repository string `yaml:"repository"`
+	// Version is the version number of the dependent chart.
+	// In the context of helmfile this can be omitted. When omitted, it is considered `*` which results helm/helmfile fetching the latest version.
+	Version string `yaml:"version"`
+}
+
+type UnresolvedDependencies struct {
+	deps map[string][]unresolvedChartDependency
+}
+
+type ChartRequirements struct {
+	UnresolvedDependencies []unresolvedChartDependency `yaml:"dependencies"`
+}
+
+type ChartLockedRequirements struct {
+	ResolvedDependencies []ResolvedChartDependency `yaml:"dependencies"`
+	Digest               string                    `yaml:"digest"`
+	Generated            string                    `yaml:"generated"`
+}
+
+func (d *UnresolvedDependencies) Add(chart, url, versionConstraint string) error {
+	dep := unresolvedChartDependency{
+		ChartName:         chart,
+		Repository:        url,
+		VersionConstraint: versionConstraint,
+	}
+	return d.add(dep)
+}
+
+func (d *UnresolvedDependencies) add(dep unresolvedChartDependency) error {
+	deps := d.deps[dep.ChartName]
+	if deps == nil {
+		deps = []unresolvedChartDependency{dep}
+	} else {
+		deps = append(deps, dep)
+	}
+	d.deps[dep.ChartName] = deps
+	return nil
+}
+
+func (d *UnresolvedDependencies) ToChartRequirements() *ChartRequirements {
+	deps := []unresolvedChartDependency{}
+
+	for _, ds := range d.deps {
+		for _, d := range ds {
+			if d.VersionConstraint == "" {
+				d.VersionConstraint = "*"
+			}
+			deps = append(deps, d)
+		}
+	}
+
+	return &ChartRequirements{UnresolvedDependencies: deps}
+}
+
+type ResolvedDependencies struct {
+	deps map[string][]ResolvedChartDependency
+}
+
+func (d *ResolvedDependencies) add(dep ResolvedChartDependency) error {
+	deps := d.deps[dep.ChartName]
+	if deps == nil {
+		deps = []ResolvedChartDependency{dep}
+	} else {
+		deps = append(deps, dep)
+	}
+	d.deps[dep.ChartName] = deps
+	return nil
+}
+
+func (d *ResolvedDependencies) Get(chart, versionConstraint string) (string, error) {
+	if versionConstraint == "" {
+		versionConstraint = "*"
+	}
+
+	deps, exists := d.deps[chart]
+	if exists {
+		for _, dep := range deps {
+			constraint, err := semver.NewConstraint(versionConstraint)
+			if err != nil {
+				return "", err
+			}
+			version, err := semver.NewVersion(dep.Version)
+			if err != nil {
+				return "", err
+			}
+			if constraint.Check(version) {
+				return dep.Version, nil
+			}
+		}
+	}
+	return "", fmt.Errorf("no resolved dependency found for \"%s\"", chart)
+}
+
+func (st *HelmState) mergeLockedDependencies() (*HelmState, error) {
+	filename, unresolved, err := getUnresolvedDependenciess(st)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(unresolved.deps) == 0 {
+		return st, nil
+	}
+
+	depMan := NewChartDependencyManager(filename, st.logger)
+
+	if st.readFile != nil {
+		depMan.readFile = st.readFile
+	}
+
+	return resolveDependencies(st, depMan, unresolved)
+}
+
+func resolveDependencies(st *HelmState, depMan *chartDependencyManager, unresolved *UnresolvedDependencies) (*HelmState, error) {
+	resolved, lockfileExists, err := depMan.Resolve(unresolved)
+	if err != nil {
+		return nil, fmt.Errorf("unable to resolve %d deps: %v", len(unresolved.deps), err)
+	}
+	if !lockfileExists {
+		return st, nil
+	}
+
+	repoToURL := map[string]string{}
+
+	for _, r := range st.Repositories {
+		repoToURL[r.Name] = r.URL
+	}
+
+	updated := *st
+	for i, r := range updated.Releases {
+		repo, chart, ok := resolveRemoteChart(r.Chart)
+		if !ok {
+			continue
+		}
+
+		_, ok = repoToURL[repo]
+		// Skip this chart from dependency management, as there's no matching `repository` in the helmfile state,
+		// which may imply that this is a local chart within a directory, like `charts/myapp`
+		if !ok {
+			continue
+		}
+
+		ver, err := resolved.Get(chart, r.Version)
+		if err != nil {
+			return nil, err
+		}
+
+		updated.Releases[i].Version = ver
+	}
+
+	return &updated, nil
+}
+
+func (st *HelmState) updateDependenciesInTempDir(shell helmexec.DependencyUpdater, tempDir func(string, string) (string, error)) (*HelmState, error) {
+	filename, unresolved, err := getUnresolvedDependenciess(st)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(unresolved.deps) == 0 {
+		st.logger.Warnf("There are no repositories defined in your helmfile.yaml.\nThis means helmfile cannot update your dependencies or create a lock file.\nSee https://github.com/roboll/helmfile/issues/878 for more information.")
+		return st, nil
+	}
+
+	d, err := tempDir("", "")
+	if err != nil {
+		return nil, fmt.Errorf("unable to create dir: %v", err)
+	}
+	defer os.RemoveAll(d)
+
+	return updateDependencies(st, shell, unresolved, filename, d)
+}
+
+func getUnresolvedDependenciess(st *HelmState) (string, *UnresolvedDependencies, error) {
+	repoToURL := map[string]string{}
+
+	for _, r := range st.Repositories {
+		repoToURL[r.Name] = r.URL
+	}
+
+	unresolved := &UnresolvedDependencies{deps: map[string][]unresolvedChartDependency{}}
+	//if err := unresolved.Add("stable/envoy", "https://kubernetes-charts.storage.googleapis.com", ""); err != nil {
+	//	panic(err)
+	//}
+
+	for _, r := range st.Releases {
+		repo, chart, ok := resolveRemoteChart(r.Chart)
+		if !ok {
+			continue
+		}
+
+		url, ok := repoToURL[repo]
+		// Skip this chart from dependency management, as there's no matching `repository` in the helmfile state,
+		// which may imply that this is a local chart within a directory, like `charts/myapp`
+		if !ok {
+			continue
+		}
+
+		if err := unresolved.Add(chart, url, r.Version); err != nil {
+			return "", nil, err
+		}
+	}
+
+	filename := filepath.Base(st.FilePath)
+	filename = strings.TrimSuffix(filename, ".gotmpl")
+	filename = strings.TrimSuffix(filename, ".yaml")
+	filename = strings.TrimSuffix(filename, ".yml")
+
+	return filename, unresolved, nil
+}
+
+func updateDependencies(st *HelmState, shell helmexec.DependencyUpdater, unresolved *UnresolvedDependencies, filename, wd string) (*HelmState, error) {
+	depMan := NewChartDependencyManager(filename, st.logger)
+
+	_, err := depMan.Update(shell, wd, unresolved)
+	if err != nil {
+		return nil, fmt.Errorf("unable to resolve %d deps: %v", len(unresolved.deps), err)
+	}
+
+	return resolveDependencies(st, depMan, unresolved)
+}
+
+type chartDependencyManager struct {
+	Name string
+
+	logger *zap.SugaredLogger
+
+	readFile  func(string) ([]byte, error)
+	writeFile func(string, []byte, os.FileMode) error
+}
+
+func NewChartDependencyManager(name string, logger *zap.SugaredLogger) *chartDependencyManager {
+	return &chartDependencyManager{
+		Name:      name,
+		readFile:  ioutil.ReadFile,
+		writeFile: ioutil.WriteFile,
+		logger:    logger,
+	}
+}
+
+func (m *chartDependencyManager) lockFileName() string {
+	return fmt.Sprintf("%s.lock", m.Name)
+}
+
+func (m *chartDependencyManager) Update(shell helmexec.DependencyUpdater, wd string, unresolved *UnresolvedDependencies) (*ResolvedDependencies, error) {
+	if isHelm3() {
+		return m.updateHelm3(shell, wd, unresolved)
+	}
+	return m.updateHelm2(shell, wd, unresolved)
+}
+
+func (m *chartDependencyManager) updateHelm3(shell helmexec.DependencyUpdater, wd string, unresolved *UnresolvedDependencies) (*ResolvedDependencies, error) {
+	// Generate `Chart.yaml` of the temporary local chart
+	chartMetaContent := fmt.Sprintf("name: %s\nversion: 1.0.0\n", m.Name)
+
+	// Generate `requirements.yaml` of the temporary local chart from the helmfile state
+	reqsContent, err := yaml.Marshal(unresolved.ToChartRequirements())
+	if err != nil {
+		return nil, err
+	}
+	if err := m.writeBytes(filepath.Join(wd, "Chart.yaml"), []byte(chartMetaContent+string(reqsContent))); err != nil {
+		return nil, err
+	}
+
+	return m.doUpdate("Chart.lock", unresolved, shell, wd)
+}
+
+func (m *chartDependencyManager) updateHelm2(shell helmexec.DependencyUpdater, wd string, unresolved *UnresolvedDependencies) (*ResolvedDependencies, error) {
+	// Generate `Chart.yaml` of the temporary local chart
+	if err := m.writeBytes(filepath.Join(wd, "Chart.yaml"), []byte(fmt.Sprintf("name: %s\nversion: 1.0.0\n", m.Name))); err != nil {
+		return nil, err
+	}
+
+	// Generate `requirements.yaml` of the temporary local chart from the helmfile state
+	reqsContent, err := yaml.Marshal(unresolved.ToChartRequirements())
+	if err != nil {
+		return nil, err
+	}
+	if err := m.writeBytes(filepath.Join(wd, "requirements.yaml"), reqsContent); err != nil {
+		return nil, err
+	}
+
+	return m.doUpdate("requirements.lock", unresolved, shell, wd)
+}
+
+func (m *chartDependencyManager) doUpdate(chartLockFile string, unresolved *UnresolvedDependencies, shell helmexec.DependencyUpdater, wd string) (*ResolvedDependencies, error) {
+
+	// Generate `requirements.lock` of the temporary local chart by coping `<basename>.lock`
+	lockFile := m.lockFileName()
+
+	originalLockFileContent, err := m.readBytes(lockFile)
+	if err != nil && !os.IsNotExist(err) {
+		return nil, err
+	}
+
+	if isHelm3() && originalLockFileContent != nil {
+		if err := m.writeBytes(filepath.Join(wd, chartLockFile), originalLockFileContent); err != nil {
+			return nil, err
+		}
+	}
+
+	// Update the lock file by running `helm dependency update`
+	if err := shell.UpdateDeps(wd); err != nil {
+		return nil, err
+	}
+
+	updatedLockFileContent, err := m.readBytes(filepath.Join(wd, chartLockFile))
+	if err != nil {
+		return nil, err
+	}
+
+	// Sort requirements alphabetically by name.
+	lockedReqs := &ChartLockedRequirements{}
+	if err := yaml.Unmarshal(updatedLockFileContent, lockedReqs); err != nil {
+		return nil, err
+	}
+
+	sort.Slice(lockedReqs.ResolvedDependencies, func(i, j int) bool {
+		return lockedReqs.ResolvedDependencies[i].ChartName < lockedReqs.ResolvedDependencies[j].ChartName
+	})
+
+	// Don't update lock file if no dependency updated.
+	if !isHelm3() && originalLockFileContent != nil {
+		originalLockedReqs := &ChartLockedRequirements{}
+		if err := yaml.Unmarshal(originalLockFileContent, originalLockedReqs); err != nil {
+			return nil, err
+		}
+
+		changes, err := diff.Diff(originalLockedReqs.ResolvedDependencies, lockedReqs.ResolvedDependencies)
+
+		if err != nil {
+			return nil, err
+		}
+
+		if len(changes) == 0 {
+			lockedReqs.Generated = originalLockedReqs.Generated
+		}
+	}
+
+	updatedLockFileContent, err = yaml.Marshal(lockedReqs)
+
+	if err != nil {
+		return nil, err
+	}
+
+	// Commit the lock file if and only if everything looks ok
+	if err := m.writeBytes(lockFile, updatedLockFileContent); err != nil {
+		return nil, err
+	}
+
+	resolved, _, err := m.Resolve(unresolved)
+	return resolved, err
+}
+
+func (m *chartDependencyManager) Resolve(unresolved *UnresolvedDependencies) (*ResolvedDependencies, bool, error) {
+	updatedLockFileContent, err := m.readBytes(m.lockFileName())
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, false, nil
+		}
+		return nil, false, err
+	}
+
+	// Load resolved dependencies into memory
+	lockedReqs := &ChartLockedRequirements{}
+	if err := yaml.Unmarshal(updatedLockFileContent, lockedReqs); err != nil {
+		return nil, false, err
+	}
+
+	resolved := &ResolvedDependencies{deps: map[string][]ResolvedChartDependency{}}
+	for _, d := range lockedReqs.ResolvedDependencies {
+		if err := resolved.add(d); err != nil {
+			return nil, false, err
+		}
+	}
+
+	return resolved, true, nil
+}
+
+func (m *chartDependencyManager) readBytes(filename string) ([]byte, error) {
+	bytes, err := m.readFile(filename)
+	if err != nil {
+		return nil, err
+	}
+	m.logger.Debugf("readBytes: read from %s:\n%s", filename, bytes)
+	return bytes, nil
+}
+
+func (m *chartDependencyManager) writeBytes(filename string, data []byte) error {
+	err := m.writeFile(filename, data, 0644)
+	if err != nil {
+		return err
+	}
+	m.logger.Debugf("writeBytes: wrote to %s:\n%s", filename, data)
+	return nil
+}
@@ -0,0 +1,317 @@
+package state
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/imdario/mergo"
+	"github.com/roboll/helmfile/pkg/environment"
+	"github.com/roboll/helmfile/pkg/helmexec"
+	"github.com/roboll/helmfile/pkg/maputil"
+	"go.uber.org/zap"
+	"gopkg.in/yaml.v2"
+)
+
+type StateLoadError struct {
+	msg   string
+	Cause error
+}
+
+func (e *StateLoadError) Error() string {
+	return fmt.Sprintf("%s: %v", e.msg, e.Cause)
+}
+
+type UndefinedEnvError struct {
+	msg string
+}
+
+func (e *UndefinedEnvError) Error() string {
+	return e.msg
+}
+
+type StateCreator struct {
+	logger     *zap.SugaredLogger
+	readFile   func(string) ([]byte, error)
+	fileExists func(string) (bool, error)
+	abs        func(string) (string, error)
+	glob       func(string) ([]string, error)
+	helm       helmexec.Interface
+
+	Strict bool
+
+	LoadFile func(inheritedEnv *environment.Environment, baseDir, file string, evaluateBases bool) (*HelmState, error)
+}
+
+func NewCreator(logger *zap.SugaredLogger, readFile func(string) ([]byte, error), fileExists func(string) (bool, error), abs func(string) (string, error), glob func(string) ([]string, error), helm helmexec.Interface) *StateCreator {
+	return &StateCreator{
+		logger:     logger,
+		readFile:   readFile,
+		fileExists: fileExists,
+		abs:        abs,
+		glob:       glob,
+		Strict:     true,
+		helm:       helm,
+	}
+}
+
+// Parse parses YAML into HelmState
+func (c *StateCreator) Parse(content []byte, baseDir, file string) (*HelmState, error) {
+	var state HelmState
+
+	state.FilePath = file
+	state.basePath = baseDir
+	state.helm = c.helm
+
+	decoder := yaml.NewDecoder(bytes.NewReader(content))
+	if !c.Strict {
+		decoder.SetStrict(false)
+	} else {
+		decoder.SetStrict(true)
+	}
+	i := 0
+	for {
+		i++
+
+		var intermediate HelmState
+
+		err := decoder.Decode(&intermediate)
+		if err == io.EOF {
+			break
+		} else if err != nil {
+			return nil, &StateLoadError{fmt.Sprintf("failed to read %s: reading document at index %d", file, i), err}
+		}
+
+		if err := mergo.Merge(&state, &intermediate, mergo.WithAppendSlice); err != nil {
+			return nil, &StateLoadError{fmt.Sprintf("failed to read %s: merging document at index %d", file, i), err}
+		}
+	}
+
+	if len(state.DeprecatedReleases) > 0 {
+		if len(state.Releases) > 0 {
+			return nil, fmt.Errorf("failed to parse %s: you can't specify both `charts` and `releases` sections", file)
+		}
+		state.Releases = state.DeprecatedReleases
+		state.DeprecatedReleases = []ReleaseSpec{}
+	}
+
+	if state.DeprecatedContext != "" && state.HelmDefaults.KubeContext == "" {
+		state.HelmDefaults.KubeContext = state.DeprecatedContext
+	}
+
+	state.logger = c.logger
+
+	state.readFile = c.readFile
+	state.removeFile = os.Remove
+	state.fileExists = c.fileExists
+	state.glob = c.glob
+
+	return &state, nil
+}
+
+// LoadEnvValues loads environment values files relative to the `baseDir`
+func (c *StateCreator) LoadEnvValues(target *HelmState, env string, ctxEnv *environment.Environment) (*HelmState, error) {
+	state := *target
+
+	e, err := state.loadEnvValues(env, ctxEnv, c.readFile, c.glob)
+	if err != nil {
+		return nil, &StateLoadError{fmt.Sprintf("failed to read %s", state.FilePath), err}
+	}
+
+	e.Defaults, err = state.loadValuesEntries(nil, state.DefaultValues)
+	if err != nil {
+		return nil, err
+	}
+
+	state.Env = *e
+
+	return &state, nil
+}
+
+// Parses YAML into HelmState, while loading environment values files relative to the `baseDir`
+func (c *StateCreator) ParseAndLoad(content []byte, baseDir, file string, envName string, evaluateBases bool, envValues *environment.Environment) (*HelmState, error) {
+	state, err := c.Parse(content, baseDir, file)
+	if err != nil {
+		return nil, err
+	}
+
+	if !evaluateBases {
+		if len(state.Bases) > 0 {
+			return nil, errors.New("nested `base` helmfile is unsupported. please submit a feature request if you need this!")
+		}
+	}
+
+	state, err = c.loadBases(envValues, state, baseDir)
+	if err != nil {
+		return nil, err
+	}
+
+	state, err = c.LoadEnvValues(state, envName, envValues)
+	if err != nil {
+		return nil, err
+	}
+
+	state.FilePath = file
+
+	return state, nil
+}
+
+func (c *StateCreator) loadBases(envValues *environment.Environment, st *HelmState, baseDir string) (*HelmState, error) {
+	layers := []*HelmState{}
+	for _, b := range st.Bases {
+		base, err := c.LoadFile(envValues, baseDir, b, false)
+		if err != nil {
+			return nil, err
+		}
+		layers = append(layers, base)
+	}
+	layers = append(layers, st)
+
+	for i := 1; i < len(layers); i++ {
+		if err := mergo.Merge(layers[0], layers[i], mergo.WithAppendSlice); err != nil {
+			return nil, err
+		}
+	}
+
+	return layers[0], nil
+}
+
+func (st *HelmState) loadEnvValues(name string, ctxEnv *environment.Environment, readFile func(string) ([]byte, error), glob func(string) ([]string, error)) (*environment.Environment, error) {
+	envVals := map[string]interface{}{}
+	envSpec, ok := st.Environments[name]
+	if ok {
+		var err error
+		envVals, err = st.loadValuesEntries(envSpec.MissingFileHandler, envSpec.Values)
+		if err != nil {
+			return nil, err
+		}
+
+		if len(envSpec.Secrets) > 0 {
+
+			var envSecretFiles []string
+			for _, urlOrPath := range envSpec.Secrets {
+				resolved, skipped, err := st.storage().resolveFile(envSpec.MissingFileHandler, "environment values", urlOrPath)
+				if err != nil {
+					return nil, err
+				}
+				if skipped {
+					continue
+				}
+
+				envSecretFiles = append(envSecretFiles, resolved...)
+			}
+			if err = st.scatterGatherEnvSecretFiles(envSecretFiles, envVals, readFile); err != nil {
+				return nil, err
+			}
+		}
+	} else if ctxEnv == nil && name != DefaultEnv {
+		return nil, &UndefinedEnvError{msg: fmt.Sprintf("environment \"%s\" is not defined", name)}
+	}
+
+	newEnv := &environment.Environment{Name: name, Values: envVals}
+
+	if ctxEnv != nil {
+		intEnv := *ctxEnv
+
+		if err := mergo.Merge(&intEnv, newEnv, mergo.WithOverride); err != nil {
+			return nil, fmt.Errorf("error while merging environment values for \"%s\": %v", name, err)
+		}
+
+		newEnv = &intEnv
+	}
+
+	return newEnv, nil
+}
+
+func (st *HelmState) scatterGatherEnvSecretFiles(envSecretFiles []string, envVals map[string]interface{}, readFile func(string) ([]byte, error)) error {
+	var errs []error
+
+	inputs := envSecretFiles
+	inputsSize := len(inputs)
+
+	type secretResult struct {
+		result map[string]interface{}
+		err    error
+		path   string
+	}
+
+	secrets := make(chan string, inputsSize)
+	results := make(chan secretResult, inputsSize)
+	helm := st.helm
+
+	st.scatterGather(0, inputsSize,
+		func() {
+			for _, secretFile := range envSecretFiles {
+				secrets <- secretFile
+			}
+			close(secrets)
+		},
+		func(id int) {
+			for path := range secrets {
+				release := &ReleaseSpec{}
+				flags := st.appendConnectionFlags([]string{}, release)
+				decFile, err := helm.DecryptSecret(st.createHelmContext(release, 0), path, flags...)
+				if err != nil {
+					results <- secretResult{nil, err, path}
+					continue
+				}
+				bytes, err := readFile(decFile)
+				if err != nil {
+					results <- secretResult{nil, fmt.Errorf("failed to load environment secrets file \"%s\": %v", path, err), path}
+					continue
+				}
+				m := map[string]interface{}{}
+				if err := yaml.Unmarshal(bytes, &m); err != nil {
+					results <- secretResult{nil, fmt.Errorf("failed to load environment secrets file \"%s\": %v", path, err), path}
+					continue
+				}
+				// All the nested map key should be string. Otherwise we get strange errors due to that
+				// mergo or reflect is unable to merge map[interface{}]interface{} with map[string]interface{} or vice versa.
+				// See https://github.com/roboll/helmfile/issues/677
+				vals, err := maputil.CastKeysToStrings(m)
+				if err != nil {
+					results <- secretResult{nil, fmt.Errorf("failed to load environment secrets file \"%s\": %v", path, err), path}
+					continue
+				}
+				results <- secretResult{vals, nil, path}
+			}
+		},
+		func() {
+			for i := 0; i < inputsSize; i++ {
+				result := <-results
+				if result.err != nil {
+					errs = append(errs, result.err)
+				} else {
+					if err := mergo.Merge(&envVals, &result.result, mergo.WithOverride); err != nil {
+						errs = append(errs, fmt.Errorf("failed to load environment secrets file \"%s\": %v", result.path, err))
+					}
+				}
+			}
+			close(results)
+		},
+	)
+
+	if len(errs) > 1 {
+		for _, err := range errs {
+			st.logger.Error(err)
+		}
+		return fmt.Errorf("Failed loading environment secrets with %d errors", len(errs))
+	}
+	return nil
+}
+
+func (st *HelmState) loadValuesEntries(missingFileHandler *string, entries []interface{}) (map[string]interface{}, error) {
+	envVals := map[string]interface{}{}
+
+	valuesEntries := append([]interface{}{}, entries...)
+	ld := NewEnvironmentValuesLoader(st.storage(), st.readFile, st.logger)
+	var err error
+	envVals, err = ld.LoadEnvironmentValues(missingFileHandler, valuesEntries)
+	if err != nil {
+		return nil, err
+	}
+
+	return envVals, nil
+}
@@ -0,0 +1,351 @@
+package state
+
+import (
+	"io/ioutil"
+	"path/filepath"
+	"reflect"
+	"testing"
+
+	"github.com/roboll/helmfile/pkg/testhelper"
+	"go.uber.org/zap"
+
+	. "gotest.tools/assert"
+	"gotest.tools/assert/cmp"
+)
+
+func createFromYaml(content []byte, file string, env string, logger *zap.SugaredLogger) (*HelmState, error) {
+	c := &StateCreator{
+		logger:   logger,
+		readFile: ioutil.ReadFile,
+		abs:      filepath.Abs,
+		Strict:   true,
+	}
+	return c.ParseAndLoad(content, filepath.Dir(file), file, env, false, nil)
+}
+
+func TestReadFromYaml(t *testing.T) {
+	yamlFile := "example/path/to/yaml/file"
+	yamlContent := []byte(`releases:
+- name: myrelease
+  namespace: mynamespace
+  chart: mychart
+`)
+	state, err := createFromYaml(yamlContent, yamlFile, DefaultEnv, logger)
+	if err != nil {
+		t.Errorf("unxpected error: %v", err)
+	}
+
+	if state.Releases[0].Name != "myrelease" {
+		t.Errorf("unexpected release name: expected=myrelease actual=%s", state.Releases[0].Name)
+	}
+	if state.Releases[0].Namespace != "mynamespace" {
+		t.Errorf("unexpected chart namespace: expected=mynamespace actual=%s", state.Releases[0].Chart)
+	}
+	if state.Releases[0].Chart != "mychart" {
+		t.Errorf("unexpected chart name: expected=mychart actual=%s", state.Releases[0].Chart)
+	}
+}
+
+func TestReadFromYaml_InexistentEnv(t *testing.T) {
+	yamlFile := "example/path/to/yaml/file"
+	yamlContent := []byte(`releases:
+- name: myrelease
+  namespace: mynamespace
+  chart: mychart
+`)
+	_, err := createFromYaml(yamlContent, yamlFile, "production", logger)
+	if err == nil {
+		t.Error("expected error")
+	}
+}
+
+func TestReadFromYaml_NonDefaultEnv(t *testing.T) {
+	yamlFile := "/example/path/to/helmfile.yaml"
+	yamlContent := []byte(`environments:
+  production:
+    values:
+    - foo.yaml
+    - bar.yaml.gotmpl
+
+releases:
+- name: myrelease
+  namespace: mynamespace
+  chart: mychart
+  values:
+  - values.yaml.gotmpl
+`)
+
+	fooYamlFile := "/example/path/to/foo.yaml"
+	fooYamlContent := []byte(`foo: foo
+# As this file doesn't have an file extension ".gotmpl", this template expression should not be evaluated
+baz: "{{ readFile \"baz.txt\" }}"`)
+
+	barYamlFile := "/example/path/to/bar.yaml.gotmpl"
+	barYamlContent := []byte(`foo: FOO
+bar: {{ readFile "bar.txt" }}
+`)
+
+	barTextFile := "/example/path/to/bar.txt"
+	barTextContent := []byte("BAR")
+
+	expected := map[string]interface{}{
+		"foo": "FOO",
+		"bar": "BAR",
+		// As the file doesn't have an file extension ".gotmpl", this template expression should not be evaluated
+		"baz": "{{ readFile \"baz.txt\" }}",
+	}
+
+	valuesFile := "/example/path/to/values.yaml.gotmpl"
+	valuesContent := []byte(`env: {{ .Environment.Name }}`)
+
+	expectedValues := `env: production`
+
+	testFs := testhelper.NewTestFs(map[string]string{
+		fooYamlFile: string(fooYamlContent),
+		barYamlFile: string(barYamlContent),
+		barTextFile: string(barTextContent),
+		valuesFile:  string(valuesContent),
+	})
+	testFs.Cwd = "/example/path/to"
+
+	state, err := NewCreator(logger, testFs.ReadFile, testFs.FileExists, testFs.Abs, testFs.Glob, nil).ParseAndLoad(yamlContent, filepath.Dir(yamlFile), yamlFile, "production", false, nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	actual := state.Env.Values
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("unexpected environment values: expected=%v, actual=%v", expected, actual)
+	}
+
+	actualValuesData, err := state.RenderValuesFileToBytes(valuesFile)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	actualValues := string(actualValuesData)
+
+	if !reflect.DeepEqual(expectedValues, actualValues) {
+		t.Errorf("unexpected values: expected=%v, actual=%v", expectedValues, actualValues)
+	}
+}
+
+func TestReadFromYaml_StrictUnmarshalling(t *testing.T) {
+	yamlFile := "example/path/to/yaml/file"
+	yamlContent := []byte(`releases:
+- name: myrelease
+  namespace: mynamespace
+  releases: mychart
+`)
+	_, err := createFromYaml(yamlContent, yamlFile, DefaultEnv, logger)
+	if err == nil {
+		t.Error("expected an error for wrong key 'releases' which is not in struct")
+	}
+}
+
+func TestReadFromYaml_DeprecatedReleaseReferences(t *testing.T) {
+	yamlFile := "example/path/to/yaml/file"
+	yamlContent := []byte(`charts:
+- name: myrelease
+  chart: mychart
+`)
+	state, err := createFromYaml(yamlContent, yamlFile, DefaultEnv, logger)
+	if err != nil {
+		t.Errorf("unxpected error: %v", err)
+	}
+
+	if state.Releases[0].Name != "myrelease" {
+		t.Errorf("unexpected release name: expected=myrelease actual=%s", state.Releases[0].Name)
+	}
+	if state.Releases[0].Chart != "mychart" {
+		t.Errorf("unexpected chart name: expected=mychart actual=%s", state.Releases[0].Chart)
+	}
+}
+
+func TestReadFromYaml_ConflictingReleasesConfig(t *testing.T) {
+	yamlFile := "example/path/to/yaml/file"
+	yamlContent := []byte(`charts:
+- name: myrelease1
+  chart: mychart1
+releases:
+- name: myrelease2
+  chart: mychart2
+`)
+	_, err := createFromYaml(yamlContent, yamlFile, DefaultEnv, logger)
+	if err == nil {
+		t.Error("expected error")
+	}
+}
+
+func TestReadFromYaml_FilterReleasesOnLabels(t *testing.T) {
+	yamlFile := "example/path/to/yaml/file"
+	yamlContent := []byte(`releases:
+- name: myrelease1
+  chart: mychart1
+  labels:
+    tier: frontend
+    foo: bar
+- name: myrelease2
+  chart: mychart2
+  labels:
+    tier: frontend
+- name: myrelease3
+  chart: mychart3
+  labels:
+    tier: backend
+`)
+	cases := []struct {
+		filter  LabelFilter
+		results []bool
+	}{
+		{LabelFilter{positiveLabels: [][]string{[]string{"tier", "frontend"}}},
+			[]bool{true, true, false}},
+		{LabelFilter{positiveLabels: [][]string{[]string{"tier", "frontend"}, []string{"foo", "bar"}}},
+			[]bool{true, false, false}},
+		{LabelFilter{negativeLabels: [][]string{[]string{"tier", "frontend"}}},
+			[]bool{false, false, true}},
+		{LabelFilter{positiveLabels: [][]string{[]string{"tier", "frontend"}}, negativeLabels: [][]string{[]string{"foo", "bar"}}},
+			[]bool{false, true, false}},
+	}
+	state, err := createFromYaml(yamlContent, yamlFile, DefaultEnv, logger)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	for idx, c := range cases {
+		for idx2, expected := range c.results {
+			if f := c.filter.Match(state.Releases[idx2]); f != expected {
+				t.Errorf("[case: %d][outcome: %d] Unexpected outcome wanted %t, got %t", idx, idx2, expected, f)
+			}
+		}
+	}
+}
+
+func TestReadFromYaml_FilterNegatives(t *testing.T) {
+	yamlFile := "example/path/to/yaml/file"
+	yamlContent := []byte(`releases:
+- name: myrelease1
+  chart: mychart1
+  labels:
+    stage: pre
+    foo: bar
+- name: myrelease2
+  chart: mychart2
+  labels:
+    stage: post
+- name: myrelease3
+  chart: mychart3
+`)
+	cases := []struct {
+		filter  LabelFilter
+		results []bool
+	}{
+		{LabelFilter{positiveLabels: [][]string{[]string{"stage", "pre"}}},
+			[]bool{true, false, false}},
+		{LabelFilter{positiveLabels: [][]string{[]string{"stage", "post"}}},
+			[]bool{false, true, false}},
+		{LabelFilter{negativeLabels: [][]string{[]string{"stage", "pre"}, []string{"stage", "post"}}},
+			[]bool{false, false, true}},
+	}
+	state, err := createFromYaml(yamlContent, yamlFile, DefaultEnv, logger)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	for idx, c := range cases {
+		for idx2, expected := range c.results {
+			if f := c.filter.Match(state.Releases[idx2]); f != expected {
+				t.Errorf("[case: %d][outcome: %d] Unexpected outcome wanted %t, got %t", idx, idx2, expected, f)
+			}
+		}
+	}
+}
+
+func TestReadFromYaml_Helmfiles_Selectors(t *testing.T) {
+	tests := []struct {
+		path      string
+		content   []byte
+		wantErr   bool
+		helmfiles []SubHelmfileSpec
+	}{
+		{
+			path: "working/selector",
+			content: []byte(`helmfiles:
+- simple/helmfile.yaml
+- path: path/prefix/selector.yaml
+  selectors:
+    - name=zorba
+    - foo=bar
+- path: path/prefix/empty/selector.yaml
+  selectors: []
+- path: path/prefix/inherits/selector.yaml
+  selectorsInherited: true
+`),
+			wantErr: false,
+			helmfiles: []SubHelmfileSpec{{Path: "simple/helmfile.yaml", Selectors: nil, SelectorsInherited: false},
+				{Path: "path/prefix/selector.yaml", Selectors: []string{"name=zorba", "foo=bar"}, SelectorsInherited: false},
+				{Path: "path/prefix/empty/selector.yaml", Selectors: []string{}, SelectorsInherited: false},
+				{Path: "path/prefix/inherits/selector.yaml", Selectors: nil, SelectorsInherited: true},
+			},
+		},
+		{
+			path: "failing2/selector",
+			content: []byte(`helmfiles:
+- path: failing2/helmfile.yaml
+    wrongkey:
+`),
+			wantErr: true,
+		},
+		{
+			path: "failing3/selector",
+			content: []byte(`helmfiles:
+- path: failing3/helmfile.yaml
+    selectors: foo
+`),
+			wantErr: true,
+		},
+		{
+			path: "failing4/selector",
+			content: []byte(`helmfiles:
+- path: failing4/helmfile.yaml
+    selectors:
+`),
+			wantErr: true,
+		},
+		{
+			path: "failing4/selector",
+			content: []byte(`helmfiles:
+- path: failing4/helmfile.yaml
+    selectors:
+      - colon: not-authorized
+`),
+			wantErr: true,
+		},
+		{
+			path: "failing6/selector",
+			content: []byte(`helmfiles:
+- selectors:
+    - whatever
+`),
+			wantErr: true,
+		},
+		{
+			path: "failing7/selector",
+			content: []byte(`helmfiles:
+- path: foo/bar
+  selectors:
+  - foo=bar
+  selectorsInherited: true
+`),
+			wantErr: true,
+		},
+	}
+	for _, test := range tests {
+		st, err := createFromYaml(test.content, test.path, DefaultEnv, logger)
+		if err != nil {
+			if test.wantErr {
+				continue
+			} else {
+				t.Error("unexpected error:", err)
+			}
+		}
+		Assert(t, cmp.DeepEqual(st.Helmfiles, test.helmfiles), "for path %v", test.path)
+	}
+}
@@ -0,0 +1,15 @@
+package state
+
+type EnvironmentSpec struct {
+	Values  []interface{} `yaml:"values,omitempty"`
+	Secrets []string      `yaml:"secrets,omitempty"`
+
+	// MissingFileHandler instructs helmfile to fail when unable to find a environment values file listed
+	// under `environments.NAME.values`.
+	//
+	// Possible values are  "Error", "Warn", "Info", "Debug". The default is "Error".
+	//
+	// Use "Warn", "Info", or "Debug" if you want helmfile to not fail when a values file is missing, while just leaving
+	// a message about the missing file at the log-level.
+	MissingFileHandler *string `yaml:"missingFileHandler,omitempty"`
+}
@@ -0,0 +1,83 @@
+package state
+
+import (
+	"fmt"
+	"github.com/imdario/mergo"
+	"github.com/roboll/helmfile/pkg/environment"
+	"github.com/roboll/helmfile/pkg/maputil"
+	"github.com/roboll/helmfile/pkg/tmpl"
+	"go.uber.org/zap"
+	"gopkg.in/yaml.v2"
+	"path/filepath"
+)
+
+type EnvironmentValuesLoader struct {
+	storage *Storage
+
+	readFile func(string) ([]byte, error)
+
+	logger *zap.SugaredLogger
+}
+
+func NewEnvironmentValuesLoader(storage *Storage, readFile func(string) ([]byte, error), logger *zap.SugaredLogger) *EnvironmentValuesLoader {
+	return &EnvironmentValuesLoader{
+		storage:  storage,
+		readFile: readFile,
+		logger:   logger,
+	}
+}
+
+func (ld *EnvironmentValuesLoader) LoadEnvironmentValues(missingFileHandler *string, valuesEntries []interface{}) (map[string]interface{}, error) {
+	result := map[string]interface{}{}
+
+	for _, entry := range valuesEntries {
+		maps := []interface{}{}
+
+		switch strOrMap := entry.(type) {
+		case string:
+			urlOrPath := strOrMap
+			files, skipped, err := ld.storage.resolveFile(missingFileHandler, "environment values", urlOrPath)
+			if err != nil {
+				return nil, err
+			}
+			if skipped {
+				continue
+			}
+
+			for _, f := range files {
+				tmplData := EnvironmentTemplateData{environment.EmptyEnvironment, "", map[string]interface{}{}}
+				r := tmpl.NewFileRenderer(ld.readFile, filepath.Dir(f), tmplData)
+				bytes, err := r.RenderToBytes(f)
+				if err != nil {
+					return nil, fmt.Errorf("failed to load environment values file \"%s\": %v", f, err)
+				}
+				m := map[string]interface{}{}
+				if err := yaml.Unmarshal(bytes, &m); err != nil {
+					return nil, fmt.Errorf("failed to load environment values file \"%s\": %v\n\nOffending YAML:\n%s", f, err, bytes)
+				}
+				maps = append(maps, m)
+				if ld.logger != nil {
+					ld.logger.Debugf("envvals_loader: loaded %s:%v", strOrMap, m)
+				}
+			}
+		case map[interface{}]interface{}:
+			maps = append(maps, strOrMap)
+		default:
+			return nil, fmt.Errorf("unexpected type of value: value=%v, type=%T", strOrMap, strOrMap)
+		}
+		for _, m := range maps {
+			// All the nested map key should be string. Otherwise we get strange errors due to that
+			// mergo or reflect is unable to merge map[interface{}]interface{} with map[string]interface{} or vice versa.
+			// See https://github.com/roboll/helmfile/issues/677
+			vals, err := maputil.CastKeysToStrings(m)
+			if err != nil {
+				return nil, err
+			}
+			if err := mergo.Merge(&result, &vals, mergo.WithOverride); err != nil {
+				return nil, fmt.Errorf("failed to merge %v: %v", m, err)
+			}
+		}
+	}
+
+	return result, nil
+}
@@ -0,0 +1,55 @@
+package state
+
+type Dependency struct {
+	Chart   string `yaml:"chart"`
+	Version string `yaml:"version"`
+	Alias   string `yaml:"alias"`
+}
+
+func (st *HelmState) appendHelmXFlags(flags []string, release *ReleaseSpec) ([]string, error) {
+	for _, d := range release.Dependencies {
+		var dep string
+		if d.Alias != "" {
+			dep += d.Alias + "="
+		}
+		dep += d.Chart
+		if d.Version != "" {
+			dep += ":" + d.Version
+		}
+		flags = append(flags, "--dependency", dep)
+	}
+
+	for _, adopt := range release.Adopt {
+		flags = append(flags, "--adopt", adopt)
+	}
+
+	jsonPatches := release.JSONPatches
+	if len(jsonPatches) > 0 {
+		generatedFiles, err := st.generateTemporaryValuesFiles(jsonPatches, release.MissingFileHandler)
+		if err != nil {
+			return nil, err
+		}
+
+		for _, f := range generatedFiles {
+			flags = append(flags, "--json-patch", f)
+		}
+
+		release.generatedValues = append(release.generatedValues, generatedFiles...)
+	}
+
+	strategicMergePatches := release.StrategicMergePatches
+	if len(strategicMergePatches) > 0 {
+		generatedFiles, err := st.generateTemporaryValuesFiles(strategicMergePatches, release.MissingFileHandler)
+		if err != nil {
+			return nil, err
+		}
+
+		for _, f := range generatedFiles {
+			flags = append(flags, "--strategic-merge-patch", f)
+		}
+
+		release.generatedValues = append(release.generatedValues, generatedFiles...)
+	}
+
+	return flags, nil
+}
@@ -0,0 +1,204 @@
+package state
+
+import (
+	"fmt"
+
+	"github.com/roboll/helmfile/pkg/tmpl"
+	"gopkg.in/yaml.v2"
+)
+
+func (r ReleaseSpec) ExecuteTemplateExpressions(renderer *tmpl.FileRenderer) (*ReleaseSpec, error) {
+	var result *ReleaseSpec
+	var err error
+
+	result, err = r.Clone()
+	if err != nil {
+		return nil, fmt.Errorf("failed executing template expressions in release \"%s\": %v", r.Name, err)
+	}
+
+	{
+		ts := result.Name
+		result.Name, err = renderer.RenderTemplateContentToString([]byte(ts))
+		if err != nil {
+			return nil, fmt.Errorf("failed executing template expressions in release \"%s\".name = \"%s\": %v", r.Name, ts, err)
+		}
+	}
+
+	{
+		ts := result.Chart
+		result.Chart, err = renderer.RenderTemplateContentToString([]byte(ts))
+		if err != nil {
+			return nil, fmt.Errorf("failed executing template expressions in release \"%s\".chart = \"%s\": %v", r.Name, ts, err)
+		}
+	}
+
+	{
+		ts := result.Namespace
+		result.Namespace, err = renderer.RenderTemplateContentToString([]byte(ts))
+		if err != nil {
+			return nil, fmt.Errorf("failed executing template expressions in release \"%s\".namespace = \"%s\": %v", r.Name, ts, err)
+		}
+	}
+
+	{
+		ts := result.Version
+		result.Version, err = renderer.RenderTemplateContentToString([]byte(ts))
+		if err != nil {
+			return nil, fmt.Errorf("failed executing template expressions in release \"%s\".version = \"%s\": %v", r.Name, ts, err)
+		}
+	}
+
+	if result.WaitTemplate != nil {
+		ts := *result.WaitTemplate
+		resultTmpl, err := renderer.RenderTemplateContentToString([]byte(ts))
+		if err != nil {
+			return nil, fmt.Errorf("failed executing template expressions in release \"%s\".version = \"%s\": %v", r.Name, ts, err)
+		}
+		result.WaitTemplate = &resultTmpl
+	}
+
+	if result.InstalledTemplate != nil {
+		ts := *result.InstalledTemplate
+		resultTmpl, err := renderer.RenderTemplateContentToString([]byte(ts))
+		if err != nil {
+			return nil, fmt.Errorf("failed executing template expressions in release \"%s\".version = \"%s\": %v", r.Name, ts, err)
+		}
+		result.InstalledTemplate = &resultTmpl
+	}
+
+	if result.TillerlessTemplate != nil {
+		ts := *result.TillerlessTemplate
+		resultTmpl, err := renderer.RenderTemplateContentToString([]byte(ts))
+		if err != nil {
+			return nil, fmt.Errorf("failed executing template expressions in release \"%s\".version = \"%s\": %v", r.Name, ts, err)
+		}
+		result.TillerlessTemplate = &resultTmpl
+	}
+
+	if result.VerifyTemplate != nil {
+		ts := *result.VerifyTemplate
+		resultTmpl, err := renderer.RenderTemplateContentToString([]byte(ts))
+		if err != nil {
+			return nil, fmt.Errorf("failed executing template expressions in release \"%s\".version = \"%s\": %v", r.Name, ts, err)
+		}
+		result.VerifyTemplate = &resultTmpl
+	}
+
+	for key, val := range result.Labels {
+		ts := val
+		s, err := renderer.RenderTemplateContentToBuffer([]byte(ts))
+		if err != nil {
+			return nil, fmt.Errorf("failed executing template expressions in release \"%s\".labels[%s] = \"%s\": %v", r.Name, key, ts, err)
+		}
+		result.Labels[key] = s.String()
+	}
+
+	if result.ValuesTemplate != nil && len(result.ValuesTemplate) > 0 {
+		for i, t := range result.ValuesTemplate {
+			switch ts := t.(type) {
+			case map[interface{}]interface{}:
+				serialized, err := yaml.Marshal(ts)
+				if err != nil {
+					return nil, fmt.Errorf("failed executing template expressions in release \"%s\".values[%d] = \"%v\": %v", r.Name, i, ts, err)
+				}
+
+				s, err := renderer.RenderTemplateContentToBuffer([]byte(serialized))
+				if err != nil {
+					return nil, fmt.Errorf("failed executing template expressions in release \"%s\".values[%d] = \"%v\": %v", r.Name, i, serialized, err)
+				}
+
+				var deserialized map[interface{}]interface{}
+
+				if err := yaml.Unmarshal(s.Bytes(), &deserialized); err != nil {
+					return nil, fmt.Errorf("failed executing template expressions in release \"%s\".values[%d] = \"%v\": %v", r.Name, i, ts, err)
+				}
+
+				result.ValuesTemplate[i] = deserialized
+			}
+		}
+
+		result.Values = result.ValuesTemplate
+	}
+
+	for i, t := range result.Values {
+		switch ts := t.(type) {
+		case string:
+			s, err := renderer.RenderTemplateContentToBuffer([]byte(ts))
+			if err != nil {
+				return nil, fmt.Errorf("failed executing template expressions in release \"%s\".values[%d] = \"%s\": %v", r.Name, i, ts, err)
+			}
+			result.Values[i] = s.String()
+		}
+	}
+
+	for i, ts := range result.Secrets {
+		s, err := renderer.RenderTemplateContentToBuffer([]byte(ts))
+		if err != nil {
+			return nil, fmt.Errorf("failed executing template expressions in release \"%s\".secrets[%d] = \"%s\": %v", r.Name, i, ts, err)
+		}
+		result.Secrets[i] = s.String()
+	}
+
+	if result.SetValuesTemplate != nil && len(result.SetValuesTemplate) > 0 {
+		for i, val := range result.SetValuesTemplate {
+			{
+				// name
+				ts := val.Name
+				s, err := renderer.RenderTemplateContentToBuffer([]byte(ts))
+				if err != nil {
+					return nil, fmt.Errorf("failed executing template expressions in release \"%s\".set[%d].name = \"%s\": %v", r.Name, i, ts, err)
+				}
+				result.SetValuesTemplate[i].Name = s.String()
+			}
+			{
+				// value
+				ts := val.Value
+				s, err := renderer.RenderTemplateContentToBuffer([]byte(ts))
+				if err != nil {
+					return nil, fmt.Errorf("failed executing template expressions in release \"%s\".set[%d].value = \"%s\": %v", r.Name, i, ts, err)
+				}
+				result.SetValuesTemplate[i].Value = s.String()
+			}
+			{
+				// file
+				ts := val.File
+				s, err := renderer.RenderTemplateContentToBuffer([]byte(ts))
+				if err != nil {
+					return nil, fmt.Errorf("failed executing template expressions in release \"%s\".set[%d].file = \"%s\": %v", r.Name, i, ts, err)
+				}
+				result.SetValuesTemplate[i].File = s.String()
+			}
+			for j, ts := range val.Values {
+				// values
+				s, err := renderer.RenderTemplateContentToBuffer([]byte(ts))
+				if err != nil {
+					return nil, fmt.Errorf("failed executing template expressions in release \"%s\".set[%d].values[%d] = \"%s\": %v", r.Name, i, j, ts, err)
+				}
+				result.SetValuesTemplate[i].Values[j] = s.String()
+			}
+		}
+
+		result.SetValues = result.SetValuesTemplate
+	}
+
+	return result, nil
+}
+
+func (r ReleaseSpec) Clone() (*ReleaseSpec, error) {
+	serialized, err := yaml.Marshal(r)
+	if err != nil {
+		return nil, fmt.Errorf("failed cloning release \"%s\": %v", r.Name, err)
+	}
+
+	var deserialized ReleaseSpec
+
+	if err := yaml.Unmarshal(serialized, &deserialized); err != nil {
+		return nil, fmt.Errorf("failed cloning release \"%s\": %v", r.Name, err)
+	}
+
+	return &deserialized, nil
+}
+
+func (r ReleaseSpec) Desired() bool {
+	return r.Installed == nil || *r.Installed
+}
@@ -0,0 +1,21 @@
+package state
+
+import (
+	"fmt"
+)
+
+const ReleaseErrorCodeFailure = 1
+
+type ReleaseError struct {
+	*ReleaseSpec
+	err  error
+	Code int
+}
+
+func (e *ReleaseError) Error() string {
+	return fmt.Sprintf("failed processing release %s: %v", e.Name, e.err.Error())
+}
+
+func newReleaseError(release *ReleaseSpec, err error) *ReleaseError {
+	return &ReleaseError{release, err, ReleaseErrorCodeFailure}
+}
@@ -62,7 +62,7 @@ func ParseLabels(l string) (LabelFilter, error) {
 			kv := strings.Split(label, "=")
 			lf.positiveLabels = append(lf.positiveLabels, kv)
 		} else { // malformed case
-			err = fmt.Errorf("Malformed label: %s. Expected label in form k=v or k!=v", label)
+			return lf, fmt.Errorf("Malformed label: %s. Expected label in form k=v or k!=v", label)
 		}
 	}
 	return lf, err
@@ -0,0 +1,134 @@
+package state
+
+import (
+	"fmt"
+	"reflect"
+
+	"github.com/imdario/mergo"
+	"github.com/roboll/helmfile/pkg/maputil"
+	"github.com/roboll/helmfile/pkg/tmpl"
+	"gopkg.in/yaml.v2"
+)
+
+func (st *HelmState) Values() (map[string]interface{}, error) {
+	vals := map[string]interface{}{}
+
+	if err := mergo.Merge(&vals, st.Env.Defaults, mergo.WithOverride); err != nil {
+		return nil, err
+	}
+	if err := mergo.Merge(&vals, st.Env.Values, mergo.WithOverride); err != nil {
+		return nil, err
+	}
+
+	vals, err := maputil.CastKeysToStrings(vals)
+	if err != nil {
+		return nil, err
+	}
+
+	return vals, nil
+}
+
+func (st *HelmState) mustLoadVals() map[string]interface{} {
+	vals, err := st.Values()
+	if err != nil {
+		panic(err)
+	}
+	return vals
+}
+
+func (st *HelmState) valuesFileTemplateData() EnvironmentTemplateData {
+	return EnvironmentTemplateData{
+		Environment: st.Env,
+		Namespace:   st.Namespace,
+		Values:      st.mustLoadVals(),
+	}
+}
+
+func getBoolRefFromStringTemplate(templateRef string) (*bool, error) {
+	var result bool
+	if err := yaml.Unmarshal([]byte(templateRef), &result); err != nil {
+		return nil, fmt.Errorf("failed deserialising string %s: %v", templateRef, err)
+	}
+	return &result, nil
+}
+
+func updateBoolTemplatedValues(r *ReleaseSpec) error {
+
+	if r.InstalledTemplate != nil {
+		if installed, err := getBoolRefFromStringTemplate(*r.InstalledTemplate); err != nil {
+			return fmt.Errorf("installedTemplate: %v", err)
+		} else {
+			r.InstalledTemplate = nil
+			r.Installed = installed
+		}
+	}
+
+	if r.WaitTemplate != nil {
+		if wait, err := getBoolRefFromStringTemplate(*r.WaitTemplate); err != nil {
+			return fmt.Errorf("waitTemplate: %v", err)
+		} else {
+			r.WaitTemplate = nil
+			r.Wait = wait
+		}
+	}
+
+	if r.TillerlessTemplate != nil {
+		if tillerless, err := getBoolRefFromStringTemplate(*r.TillerlessTemplate); err != nil {
+			return fmt.Errorf("tillerlessTemplate: %v", err)
+		} else {
+			r.TillerlessTemplate = nil
+			r.Tillerless = tillerless
+		}
+	}
+
+	if r.VerifyTemplate != nil {
+		if verify, err := getBoolRefFromStringTemplate(*r.VerifyTemplate); err != nil {
+			return fmt.Errorf("verifyTemplate: %v", err)
+		} else {
+			r.VerifyTemplate = nil
+			r.Verify = verify
+		}
+	}
+
+	return nil
+}
+
+func (st *HelmState) ExecuteTemplates() (*HelmState, error) {
+	r := *st
+
+	vals, err := st.Values()
+	if err != nil {
+		return nil, err
+	}
+
+	for i, rt := range st.Releases {
+		successFlag := false
+		for it, prev := 0, &rt; it < 6; it++ {
+			tmplData := releaseTemplateData{
+				Environment: st.Env,
+				Release:     *prev,
+				Values:      vals,
+			}
+			renderer := tmpl.NewFileRenderer(st.readFile, st.basePath, tmplData)
+			r, err := rt.ExecuteTemplateExpressions(renderer)
+			if err != nil {
+				return nil, fmt.Errorf("failed executing templates in release \"%s\".\"%s\": %v", st.FilePath, rt.Name, err)
+			}
+			if reflect.DeepEqual(prev, r) {
+				successFlag = true
+				if err := updateBoolTemplatedValues(r); err != nil {
+					return nil, fmt.Errorf("failed executing templates in release \"%s\".\"%s\": %v", st.FilePath, rt.Name, err)
+				}
+				st.Releases[i] = *r
+				break
+			}
+			prev = r
+		}
+		if !successFlag {
+			return nil, fmt.Errorf("failed executing templates in release \"%s\".\"%s\": %s", st.FilePath, rt.Name,
+				"recursive references can't be resolved")
+		}
+	}
+
+	return &r, nil
+}
@@ -0,0 +1,256 @@
+package state
+
+import (
+	"fmt"
+	"reflect"
+	"strings"
+	"testing"
+
+	"github.com/go-test/deep"
+	"github.com/roboll/helmfile/pkg/environment"
+)
+
+func boolPtrToString(ptr *bool) string {
+	if ptr == nil {
+		return "<nil>"
+	}
+	return fmt.Sprintf("&%t", *ptr)
+}
+
+func ptr(v interface{}) interface{} {
+	r := v
+	return reflect.ValueOf(r).Addr().Interface()
+}
+
+func TestHelmState_executeTemplates(t *testing.T) {
+	tests := []struct {
+		name  string
+		input ReleaseSpec
+		want  ReleaseSpec
+	}{
+		{
+			name: "Has template expressions in chart, values, secrets, version, labels",
+			input: ReleaseSpec{
+				Chart:          "test-charts/{{ .Release.Name }}",
+				Version:        "{{ .Release.Name }}-0.1",
+				Name:           "test-app",
+				Namespace:      "test-namespace-{{ .Release.Name }}",
+				ValuesTemplate: []interface{}{"config/{{ .Environment.Name }}/{{ .Release.Name }}/values.yaml"},
+				Secrets:        []string{"config/{{ .Environment.Name }}/{{ .Release.Name }}/secrets.yaml"},
+				Labels:         map[string]string{"id": "{{ .Release.Name }}"},
+			},
+			want: ReleaseSpec{
+				Chart:     "test-charts/test-app",
+				Version:   "test-app-0.1",
+				Name:      "test-app",
+				Namespace: "test-namespace-test-app",
+				Values:    []interface{}{"config/test_env/test-app/values.yaml"},
+				Secrets:   []string{"config/test_env/test-app/secrets.yaml"},
+				Labels:    map[string]string{"id": "test-app"},
+			},
+		},
+		{
+			name: "Has template expressions in name with recursive refs",
+			input: ReleaseSpec{
+				Chart:     "test-chart",
+				Name:      "{{ .Release.Labels.id }}-{{ .Release.Namespace }}",
+				Namespace: "dev",
+				Labels:    map[string]string{"id": "{{ .Release.Chart }}"},
+			},
+			want: ReleaseSpec{
+				Chart:     "test-chart",
+				Name:      "test-chart-dev",
+				Namespace: "dev",
+				Labels:    map[string]string{"id": "test-chart"},
+			},
+		},
+		{
+			name: "Has template expressions in boolean values",
+			input: ReleaseSpec{
+				Chart:              "test-chart",
+				Name:               "app-dev",
+				Namespace:          "dev",
+				Labels:             map[string]string{"id": "app"},
+				InstalledTemplate:  func(i string) *string { return &i }(`{{ eq .Release.Labels.id "app" | ternary "yes" "no" }}`),
+				VerifyTemplate:     func(i string) *string { return &i }(`{{ true }}`),
+				Verify:             func(i bool) *bool { return &i }(false),
+				WaitTemplate:       func(i string) *string { return &i }(`{{ false }}`),
+				TillerlessTemplate: func(i string) *string { return &i }(`yes`),
+			},
+			want: ReleaseSpec{
+				Chart:      "test-chart",
+				Name:       "app-dev",
+				Namespace:  "dev",
+				Labels:     map[string]string{"id": "app"},
+				Installed:  func(i bool) *bool { return &i }(true),
+				Verify:     func(i bool) *bool { return &i }(true),
+				Wait:       func(i bool) *bool { return &i }(false),
+				Tillerless: func(i bool) *bool { return &i }(true),
+			},
+		},
+		{
+			name: "Has template in set-values",
+			input: ReleaseSpec{
+				Chart:     "test-charts/chart",
+				Name:      "test-app",
+				Namespace: "dev",
+				SetValuesTemplate: []SetValue{
+					SetValue{Name: "val1", Value: "{{ .Release.Name }}-val1"},
+					SetValue{Name: "val2", File: "{{ .Release.Name }}.yml"},
+					SetValue{Name: "val3", Values: []string{"{{ .Release.Name }}-val2", "{{ .Release.Name }}-val3"}},
+				},
+			},
+			want: ReleaseSpec{
+				Chart:     "test-charts/chart",
+				Name:      "test-app",
+				Namespace: "dev",
+				SetValues: []SetValue{
+					SetValue{Name: "val1", Value: "test-app-val1"},
+					SetValue{Name: "val2", File: "test-app.yml"},
+					SetValue{Name: "val3", Values: []string{"test-app-val2", "test-app-val3"}},
+				},
+			},
+		},
+		{
+			name: "Has template in values (map)",
+			input: ReleaseSpec{
+				Chart:          "test-charts/chart",
+				Verify:         nil,
+				Name:           "app",
+				Namespace:      "dev",
+				ValuesTemplate: []interface{}{map[string]string{"key": "{{ .Release.Name }}-val0"}},
+			},
+			want: ReleaseSpec{
+				Chart:     "test-charts/chart",
+				Verify:    nil,
+				Name:      "app",
+				Namespace: "dev",
+				Values:    []interface{}{map[interface{}]interface{}{"key": "app-val0"}},
+			},
+		},
+	}
+
+	for i := range tests {
+		tt := tests[i]
+		t.Run(tt.name, func(t *testing.T) {
+			state := &HelmState{
+				basePath: ".",
+				HelmDefaults: HelmSpec{
+					KubeContext: "test_context",
+				},
+				Env:          environment.Environment{Name: "test_env"},
+				Namespace:    "test-namespace_",
+				Repositories: nil,
+				Releases: []ReleaseSpec{
+					tt.input,
+				},
+			}
+
+			r, err := state.ExecuteTemplates()
+			if err != nil {
+				t.Errorf("Unexpected error: %v", err)
+				t.FailNow()
+			}
+
+			actual := r.Releases[0]
+
+			if !reflect.DeepEqual(actual.Name, tt.want.Name) {
+				t.Errorf("expected Name %+v, got %+v", tt.want.Name, actual.Name)
+			}
+			if !reflect.DeepEqual(actual.Chart, tt.want.Chart) {
+				t.Errorf("expected Chart %+v, got %+v", tt.want.Chart, actual.Chart)
+			}
+			if !reflect.DeepEqual(actual.Namespace, tt.want.Namespace) {
+				t.Errorf("expected Namespace %+v, got %+v", tt.want.Namespace, actual.Namespace)
+			}
+			if diff := deep.Equal(actual.Values, tt.want.Values); diff != nil && len(actual.Values) > 0 {
+				t.Errorf("Values differs \n%+v", strings.Join(diff, "\n"))
+			}
+			if diff := deep.Equal(actual.Secrets, tt.want.Secrets); diff != nil && len(actual.Secrets) > 0 {
+				t.Errorf("Secrets differs \n%+v", strings.Join(diff, "\n"))
+			}
+			if diff := deep.Equal(actual.SetValues, tt.want.SetValues); diff != nil && len(actual.SetValues) > 0 {
+				t.Errorf("SetValues differs \n%+v", strings.Join(diff, "\n"))
+			}
+			if diff := deep.Equal(actual.Labels, tt.want.Labels); diff != nil && len(actual.Labels) > 0 {
+				t.Errorf("Labels differs \n%+v", strings.Join(diff, "\n"))
+			}
+			if !reflect.DeepEqual(actual.Version, tt.want.Version) {
+				t.Errorf("expected Version %+v, got %+v", tt.want.Version, actual.Version)
+			}
+			if !reflect.DeepEqual(actual.Installed, tt.want.Installed) {
+				t.Errorf("expected actual.Installed %+v, got %+v",
+					boolPtrToString(tt.want.Installed), boolPtrToString(actual.Installed),
+				)
+			}
+			if !reflect.DeepEqual(actual.Tillerless, tt.want.Tillerless) {
+				t.Errorf("expected actual.Tillerless %+v, got %+v",
+					boolPtrToString(tt.want.Tillerless), boolPtrToString(actual.Tillerless),
+				)
+			}
+			if !reflect.DeepEqual(actual.Verify, tt.want.Verify) {
+				t.Errorf("expected actual.Verify %+v, got %+v",
+					boolPtrToString(tt.want.Verify), boolPtrToString(actual.Verify),
+				)
+			}
+			if !reflect.DeepEqual(actual.Wait, tt.want.Wait) {
+				t.Errorf("expected actual.Wait %+v, got %+v",
+					boolPtrToString(tt.want.Wait), boolPtrToString(actual.Wait),
+				)
+			}
+		})
+	}
+}
+
+func TestHelmState_recursiveRefsTemplates(t *testing.T) {
+
+	tests := []struct {
+		name  string
+		input ReleaseSpec
+	}{
+		{
+			name: "Has reqursive references",
+			input: ReleaseSpec{
+				Chart:     "test-charts/{{ .Release.Name }}",
+				Verify:    nil,
+				Name:      "{{ .Release.Labels.id }}",
+				Namespace: "dev",
+				Labels:    map[string]string{"id": "app-{{ .Release.Name }}"},
+			},
+		},
+		{
+			name: "Has unresolvable boolean templates",
+			input: ReleaseSpec{
+				Name:         "app-dev",
+				Chart:        "test-charts/app",
+				Verify:       nil,
+				Namespace:    "dev",
+				WaitTemplate: func(i string) *string { return &i }("hi"),
+			},
+		},
+	}
+
+	for i := range tests {
+		tt := tests[i]
+		t.Run(tt.name, func(t *testing.T) {
+			state := &HelmState{
+				basePath: ".",
+				HelmDefaults: HelmSpec{
+					KubeContext: "test_context",
+				},
+				Env:          environment.Environment{Name: "test_env"},
+				Namespace:    "test-namespace_",
+				Repositories: nil,
+				Releases: []ReleaseSpec{
+					tt.input,
+				},
+			}
+
+			r, err := state.ExecuteTemplates()
+			if err == nil {
+				t.Errorf("Expected error, got valid response: %v", r)
+				t.FailNow()
+			}
+		})
+	}
+}
@@ -0,0 +1,98 @@
+package state
+
+import (
+	"fmt"
+	"sync"
+
+	"github.com/roboll/helmfile/pkg/helmexec"
+)
+
+type result struct {
+	release ReleaseSpec
+	err     error
+}
+
+func (st *HelmState) scatterGather(concurrency int, items int, produceInputs func(), receiveInputsAndProduceIntermediates func(int), aggregateIntermediates func()) {
+
+	if concurrency < 1 || concurrency > items {
+		concurrency = items
+	}
+
+	for _, r := range st.Releases {
+		if r.Tillerless != nil {
+			if *r.Tillerless {
+				concurrency = 1
+			}
+		} else if st.HelmDefaults.Tillerless {
+			concurrency = 1
+		}
+	}
+
+	// WaitGroup is required to wait until goroutine per job in job queue cleanly stops.
+	var waitGroup sync.WaitGroup
+	waitGroup.Add(concurrency)
+
+	go produceInputs()
+
+	for w := 1; w <= concurrency; w++ {
+		go func(id int) {
+			st.logger.Debugf("worker %d/%d started", id, concurrency)
+			receiveInputsAndProduceIntermediates(id)
+			st.logger.Debugf("worker %d/%d finished", id, concurrency)
+			waitGroup.Done()
+		}(w)
+	}
+
+	aggregateIntermediates()
+
+	// Wait until all the goroutines to gracefully finish
+	waitGroup.Wait()
+}
+
+func (st *HelmState) scatterGatherReleases(helm helmexec.Interface, concurrency int,
+	do func(ReleaseSpec, int) error) []error {
+	var errs []error
+
+	inputs := st.Releases
+	inputsSize := len(inputs)
+
+	releases := make(chan ReleaseSpec)
+	results := make(chan result)
+
+	st.scatterGather(
+		concurrency,
+		inputsSize,
+		func() {
+			for _, release := range inputs {
+				releases <- release
+			}
+			close(releases)
+		},
+		func(id int) {
+			for release := range releases {
+				err := do(release, id)
+				st.logger.Debugf("sending result for release: %s\n", release.Name)
+				results <- result{release: release, err: err}
+				st.logger.Debugf("sent result for release: %s\n", release.Name)
+			}
+		},
+		func() {
+			for i := range inputs {
+				st.logger.Debugf("receiving result %d", i)
+				r := <-results
+				if r.err != nil {
+					errs = append(errs, fmt.Errorf("release \"%s\" failed: %v", r.release.Name, r.err))
+				} else {
+					st.logger.Debugf("received result for release \"%s\"", r.release.Name)
+				}
+				st.logger.Debugf("received result for %d", i)
+			}
+		},
+	)
+
+	if len(errs) != 0 {
+		return errs
+	}
+
+	return nil
+}
@@ -0,0 +1,99 @@
+package state
+
+import (
+	"fmt"
+	"go.uber.org/zap"
+	"net/url"
+	"path/filepath"
+	"sort"
+)
+
+type Storage struct {
+	logger *zap.SugaredLogger
+
+	FilePath string
+
+	basePath string
+	glob     func(string) ([]string, error)
+}
+
+func NewStorage(forFile string, logger *zap.SugaredLogger, glob func(string) ([]string, error)) *Storage {
+	return &Storage{
+		FilePath: forFile,
+		basePath: filepath.Dir(forFile),
+		logger:   logger,
+		glob:     glob,
+	}
+}
+
+func (st *Storage) resolveFile(missingFileHandler *string, tpe, path string) ([]string, bool, error) {
+	title := fmt.Sprintf("%s file", tpe)
+
+	files, err := st.ExpandPaths(path)
+	if err != nil {
+		return nil, false, err
+	}
+
+	var handlerId string
+
+	if missingFileHandler != nil {
+		handlerId = *missingFileHandler
+	} else {
+		handlerId = MissingFileHandlerError
+	}
+
+	if len(files) == 0 {
+		switch handlerId {
+		case MissingFileHandlerError:
+			return nil, false, fmt.Errorf("%s matching \"%s\" does not exist in \"%s\"", title, path, st.basePath)
+		case MissingFileHandlerWarn:
+			st.logger.Warnf("skipping missing %s matching \"%s\"", title, path)
+			return nil, true, nil
+		case MissingFileHandlerInfo:
+			st.logger.Infof("skipping missing %s matching \"%s\"", title, path)
+			return nil, true, nil
+		case MissingFileHandlerDebug:
+			st.logger.Debugf("skipping missing %s matching \"%s\"", title, path)
+			return nil, true, nil
+		default:
+			available := []string{
+				MissingFileHandlerError,
+				MissingFileHandlerWarn,
+				MissingFileHandlerInfo,
+				MissingFileHandlerDebug,
+			}
+			return nil, false, fmt.Errorf("invalid missing file handler \"%s\" while processing \"%s\" in \"%s\": it must be one of %s", handlerId, path, st.FilePath, available)
+		}
+	}
+
+	return files, false, nil
+}
+
+func (st *Storage) ExpandPaths(globPattern string) ([]string, error) {
+	result := []string{}
+	absPathPattern := st.normalizePath(globPattern)
+	matches, err := st.glob(absPathPattern)
+	if err != nil {
+		return nil, fmt.Errorf("failed processing %s: %v", globPattern, err)
+	}
+
+	sort.Strings(matches)
+
+	result = append(result, matches...)
+	return result, nil
+}
+
+// normalizes relative path to absolute one
+func (st *Storage) normalizePath(path string) string {
+	u, _ := url.Parse(path)
+	if u.Scheme != "" || filepath.IsAbs(path) {
+		return path
+	} else {
+		return st.JoinBase(path)
+	}
+}
+
+// JoinBase returns an absolute path in the form basePath/relative
+func (st *Storage) JoinBase(relPath string) string {
+	return filepath.Join(st.basePath, relPath)
+}
@@ -0,0 +1,30 @@
+package state
+
+import (
+	"github.com/roboll/helmfile/pkg/environment"
+)
+
+// TemplateSpec defines the structure of a reusable and composable template for helm releases.
+type TemplateSpec struct {
+	ReleaseSpec `yaml:",inline"`
+}
+
+// EnvironmentTemplateData provides variables accessible while executing golang text/template expressions in helmfile and values YAML files
+type EnvironmentTemplateData struct {
+	// Environment is accessible as `.Environment` from any template executed by the renderer
+	Environment environment.Environment
+	// Namespace is accessible as `.Namespace` from any non-values template executed by the renderer
+	Namespace string
+	// Values is accessible as `.Values` and it contains default state values overrode by environment values and override values.
+	Values map[string]interface{}
+}
+
+// releaseTemplateData provides variables accessible while executing golang text/template expressions in releases of a helmfile YAML file
+type releaseTemplateData struct {
+	// Environment is accessible as `.Environment` from any template expression executed by the renderer
+	Environment environment.Environment
+	// Release is accessible as `.Release` from any template expression executed by the renderer
+	Release ReleaseSpec
+	// Values is accessible as `.Values` and it contains default state values overrode by environment values and override values.
+	Values map[string]interface{}
+}
@@ -0,0 +1,52 @@
+package state
+
+import (
+	"path/filepath"
+	"regexp"
+	"strings"
+)
+
+func isLocalChart(chart string) bool {
+	regex, _ := regexp.Compile("^[.]?./")
+	matched := regex.MatchString(chart)
+	if matched {
+		return true
+	}
+
+	uriLike := strings.Index(chart, "://") > -1
+	if uriLike {
+		return false
+	}
+
+	return chart == "" ||
+		chart[0] == '/' ||
+		strings.Index(chart, "/") == -1 ||
+		len(strings.Split(chart, "/")) != 2
+}
+
+func resolveRemoteChart(repoAndChart string) (string, string, bool) {
+	if isLocalChart(repoAndChart) {
+		return "", "", false
+	}
+
+	parts := strings.Split(repoAndChart, "/")
+	if len(parts) != 2 {
+		return "", "", false
+	}
+
+	repo := parts[0]
+	chart := parts[1]
+
+	return repo, chart, true
+}
+
+// normalizeChart allows for the distinction between a file path reference and repository references.
+// - Any single (or double character) followed by a `/` will be considered a local file reference and
+// 	 be constructed relative to the `base path`.
+// - Everything else is assumed to be an absolute path or an actual <repository>/<chart> reference.
+func normalizeChart(basePath, chart string) string {
+	if !isLocalChart(chart) || chart[0] == '/' {
+		return chart
+	}
+	return filepath.Join(basePath, chart)
+}
@@ -0,0 +1,147 @@
+package state
+
+import "testing"
+
+func TestIsLocalChart(t *testing.T) {
+	testcases := []struct {
+		input    string
+		expected bool
+	}{
+		{
+			input:    "mychart",
+			expected: true,
+		},
+		{
+			input:    "stable/mysql",
+			expected: false,
+		},
+		{
+			input:    "./charts/myapp",
+			expected: true,
+		},
+		{
+			input:    "charts/mysubsystem/myapp",
+			expected: true,
+		},
+		{
+			input:    "./charts/mysubsystem/myapp",
+			expected: true,
+		},
+		{
+			input:    "/charts/mysubsystem/myapp",
+			expected: true,
+		},
+		{
+			// Regression test case for:
+			// * https://github.com/roboll/helmfile/issues/675
+			// * https://github.com/roboll/helmfile/issues/687
+			input:    "https://github.com/arangodb/kube-arangodb/releases/download/0.3.11/kube-arangodb-crd.tgz",
+			expected: false,
+		},
+		{
+			input:    "https://example.com/bar.tgz",
+			expected: false,
+		},
+	}
+
+	for i := range testcases {
+		testcase := testcases[i]
+
+		actual := isLocalChart(testcase.input)
+
+		if testcase.expected != actual {
+			t.Errorf("unexpected result: isLocalChart(\"%s\"): expected=%v, got=%v", testcase.input, testcase.expected, actual)
+		}
+	}
+}
+
+func TestResolveRemortChart(t *testing.T) {
+	testcases := []struct {
+		input  string
+		repo   string
+		chart  string
+		remote bool
+	}{
+		{
+			input:  "mychart",
+			remote: false,
+		},
+		{
+			input:  "stable/mysql",
+			repo:   "stable",
+			chart:  "mysql",
+			remote: true,
+		},
+		{
+			input:  "./charts/myapp",
+			remote: false,
+		},
+		{
+			input:  "charts/mysubsystem/myapp",
+			remote: false,
+		},
+		{
+			input:  "./charts/mysubsystem/myapp",
+			remote: false,
+		},
+		{
+			input:  "/charts/mysubsystem/myapp",
+			remote: false,
+		},
+		{
+			// Regression test case for:
+			// * https://github.com/roboll/helmfile/issues/675
+			// * https://github.com/roboll/helmfile/issues/687
+			input:  "https://github.com/arangodb/kube-arangodb/releases/download/0.3.11/kube-arangodb-crd.tgz",
+			remote: false,
+		},
+		{
+			input:  "https://example.com/bar.tgz",
+			remote: false,
+		},
+	}
+
+	for i := range testcases {
+		testcase := testcases[i]
+
+		repo, chart, actual := resolveRemoteChart(testcase.input)
+
+		if testcase.remote != actual {
+			t.Fatalf("unexpected result: reolveRemoteChart(\"%s\"): expected=%v, got=%v", testcase.input, testcase.remote, actual)
+		}
+
+		if testcase.repo != repo {
+			t.Errorf("unexpected repo: %s: expected=%v, got=%v", testcase.input, testcase.repo, repo)
+		}
+
+		if testcase.chart != chart {
+			t.Errorf("unexpected chart: %s: expected=%v, got=%v", testcase.input, testcase.chart, chart)
+		}
+	}
+}
+
+func TestNormalizeChart(t *testing.T) {
+	testcases := []struct {
+		input    string
+		expected string
+	}{
+		{
+			input:    "mychart",
+			expected: "/path/to/mychart",
+		},
+		{
+			input:    "/charts/mychart",
+			expected: "/charts/mychart",
+		},
+	}
+
+	for i := range testcases {
+		testcase := testcases[i]
+
+		actual := normalizeChart("/path/to", testcase.input)
+
+		if testcase.expected != actual {
+			t.Fatalf("unexpected result: normalizeChart(\"/path/to\", \"%s\"): expected=%v, got=%v", testcase.input, testcase.expected, actual)
+		}
+	}
+}
@@ -0,0 +1,137 @@
+package testhelper
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+type TestFs struct {
+	Cwd   string
+	dirs  map[string]bool
+	files map[string]string
+
+	GlobFixtures map[string][]string
+
+	fileReaderCalls int
+	successfulReads []string
+}
+
+func NewTestFs(files map[string]string) *TestFs {
+	dirs := map[string]bool{}
+	for abs, _ := range files {
+		for d := filepath.Dir(abs); !dirs[d]; d = filepath.Dir(d) {
+			dirs[d] = true
+			fmt.Fprintf(os.Stderr, "testfs: recognized dir: %s\n", d)
+		}
+	}
+	return &TestFs{
+		Cwd:   "/path/to",
+		dirs:  dirs,
+		files: files,
+
+		successfulReads: []string{},
+
+		GlobFixtures: map[string][]string{},
+	}
+}
+
+func (f *TestFs) FileExistsAt(path string) bool {
+	var ok bool
+	if strings.Contains(path, "/") {
+		_, ok = f.files[path]
+	} else {
+		_, ok = f.files[filepath.Join(f.Cwd, path)]
+	}
+	return ok
+}
+
+func (f *TestFs) FileExists(path string) (bool, error) {
+	return f.FileExistsAt(path), nil
+}
+
+func (f *TestFs) DirectoryExistsAt(path string) bool {
+	var ok bool
+	if strings.Contains(path, "/") {
+		_, ok = f.dirs[path]
+	} else {
+		_, ok = f.dirs[filepath.Join(f.Cwd, path)]
+	}
+	return ok
+}
+
+func (f *TestFs) ReadFile(filename string) ([]byte, error) {
+	var str string
+	var ok bool
+	if filename[0] == '/' {
+		str, ok = f.files[filename]
+	} else {
+		str, ok = f.files[filepath.Join(f.Cwd, filename)]
+	}
+	if !ok {
+		return []byte(nil), fmt.Errorf("no registered file found: %s", filename)
+	}
+
+	f.fileReaderCalls += 1
+
+	f.successfulReads = append(f.successfulReads, filename)
+
+	return []byte(str), nil
+}
+
+func (f *TestFs) SuccessfulReads() []string {
+	return f.successfulReads
+}
+
+func (f *TestFs) FileReaderCalls() int {
+	return f.fileReaderCalls
+}
+
+func (f *TestFs) Glob(relPattern string) ([]string, error) {
+	var pattern string
+	if relPattern[0] == '/' {
+		pattern = relPattern
+	} else {
+		pattern = filepath.Join(f.Cwd, relPattern)
+	}
+
+	fixtures, ok := f.GlobFixtures[pattern]
+	if ok {
+		return fixtures, nil
+	}
+
+	matches := []string{}
+	for name, _ := range f.files {
+		matched, err := filepath.Match(pattern, name)
+		if err != nil {
+			return nil, err
+		}
+		if matched {
+			matches = append(matches, name)
+		}
+	}
+	return matches, nil
+}
+
+func (f *TestFs) Abs(path string) (string, error) {
+	var p string
+	if path[0] == '/' {
+		p = path
+	} else {
+		p = filepath.Join(f.Cwd, path)
+	}
+	return filepath.Clean(p), nil
+}
+
+func (f *TestFs) Getwd() (string, error) {
+	return f.Cwd, nil
+}
+
+func (f *TestFs) Chdir(dir string) error {
+	if _, ok := f.dirs[dir]; ok {
+		f.Cwd = dir
+		return nil
+	}
+	return fmt.Errorf("unexpected chdir \"%s\"", dir)
+}
@@ -0,0 +1,7 @@
+package tmpl
+
+type Context struct {
+	preRender bool
+	basePath  string
+	readFile  func(string) ([]byte, error)
+}
@@ -0,0 +1,208 @@
+package tmpl
+
+import (
+	"fmt"
+	"gopkg.in/yaml.v2"
+	"io"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"reflect"
+	"strings"
+	"text/template"
+)
+
+type Values = map[string]interface{}
+
+func (c *Context) createFuncMap() template.FuncMap {
+	funcMap := template.FuncMap{
+		"exec":           c.Exec,
+		"readFile":       c.ReadFile,
+		"toYaml":         ToYaml,
+		"fromYaml":       FromYaml,
+		"setValueAtPath": SetValueAtPath,
+		"requiredEnv":    RequiredEnv,
+		"get":            get,
+		"getOrNil":       getOrNil,
+		"tpl":            c.Tpl,
+	}
+	if c.preRender {
+		// disable potential side-effect template calls
+		funcMap["exec"] = func(string, []interface{}, ...string) (string, error) {
+			return "", nil
+		}
+		funcMap["readFile"] = func(string) (string, error) {
+			return "", nil
+		}
+	}
+
+	return funcMap
+}
+
+func (c *Context) Exec(command string, args []interface{}, inputs ...string) (string, error) {
+	var input string
+	if len(inputs) > 0 {
+		input = inputs[0]
+	}
+
+	strArgs := make([]string, len(args))
+	for i, a := range args {
+		switch a.(type) {
+		case string:
+			strArgs[i] = a.(string)
+		default:
+			return "", fmt.Errorf("unexpected type of arg \"%s\" in args %v at index %d", reflect.TypeOf(a), args, i)
+		}
+	}
+
+	cmd := exec.Command(command, strArgs...)
+	cmd.Dir = c.basePath
+
+	writeErrs := make(chan error)
+	cmdErrs := make(chan error)
+	cmdOuts := make(chan []byte)
+
+	if len(input) > 0 {
+		stdin, err := cmd.StdinPipe()
+		if err != nil {
+			return "", err
+		}
+		go func(input string, stdin io.WriteCloser) {
+			defer stdin.Close()
+			defer close(writeErrs)
+
+			size := len(input)
+
+			var n int
+			var err error
+			i := 0
+			for {
+				n, err = io.WriteString(stdin, input[i:])
+				if err != nil {
+					writeErrs <- fmt.Errorf("failed while writing %d bytes to stdin of \"%s\": %v", len(input), command, err)
+					break
+				}
+				i += n
+				if n == size {
+					break
+				}
+			}
+		}(input, stdin)
+	}
+
+	go func() {
+		defer close(cmdOuts)
+		defer close(cmdErrs)
+
+		bytes, err := cmd.Output()
+		if err != nil {
+			cmdErrs <- fmt.Errorf("exec cmd=%s args=[%s] failed: %v", command, strings.Join(strArgs, ", "), err)
+		} else {
+			cmdOuts <- bytes
+		}
+	}()
+
+	for {
+		select {
+		case bytes := <-cmdOuts:
+			return string(bytes), nil
+		case err := <-cmdErrs:
+			return "", err
+		case err := <-writeErrs:
+			return "", err
+		}
+	}
+}
+
+func (c *Context) ReadFile(filename string) (string, error) {
+	var path string
+	if filepath.IsAbs(filename) {
+		path = filename
+	} else {
+		path = filepath.Join(c.basePath, filename)
+	}
+
+	bytes, err := c.readFile(path)
+	if err != nil {
+		return "", err
+	}
+	return string(bytes), nil
+}
+
+func (c *Context) Tpl(text string, data interface{}) (string, error) {
+	buf, err := c.RenderTemplateToBuffer(text, data)
+	if err != nil {
+		return "", err
+	}
+	return buf.String(), nil
+}
+
+func ToYaml(v interface{}) (string, error) {
+	data, err := yaml.Marshal(v)
+	if err != nil {
+		return "", err
+	}
+	return string(data), nil
+}
+
+func FromYaml(str string) (Values, error) {
+	m := Values{}
+
+	if err := yaml.Unmarshal([]byte(str), &m); err != nil {
+		return nil, fmt.Errorf("%s, offending yaml: %s", err, str)
+	}
+	return m, nil
+}
+
+func SetValueAtPath(path string, value interface{}, values Values) (Values, error) {
+	var current interface{}
+	current = values
+	components := strings.Split(path, ".")
+	pathToMap := components[:len(components)-1]
+	key := components[len(components)-1]
+	for _, k := range pathToMap {
+		var elem interface{}
+
+		switch typedCurrent := current.(type) {
+		case map[string]interface{}:
+			v, exists := typedCurrent[k]
+			if !exists {
+				return nil, fmt.Errorf("failed to set value at path \"%s\": value for key \"%s\" does not exist", path, k)
+			}
+			elem = v
+		case map[interface{}]interface{}:
+			v, exists := typedCurrent[k]
+			if !exists {
+				return nil, fmt.Errorf("failed to set value at path \"%s\": value for key \"%s\" does not exist", path, k)
+			}
+			elem = v
+		default:
+			return nil, fmt.Errorf("failed to set value at path \"%s\": value for key \"%s\" was not a map", path, k)
+		}
+
+		switch typedElem := elem.(type) {
+		case map[string]interface{}, map[interface{}]interface{}:
+			current = typedElem
+		default:
+			return nil, fmt.Errorf("failed to set value at path \"%s\": value for key \"%s\" was not a map", path, k)
+		}
+	}
+
+	switch typedCurrent := current.(type) {
+	case map[string]interface{}:
+		typedCurrent[key] = value
+	case map[interface{}]interface{}:
+		typedCurrent[key] = value
+	default:
+		return nil, fmt.Errorf("failed to set value at path \"%s\": value for key \"%s\" was not a map", path, key)
+	}
+	return values, nil
+}
+
+func RequiredEnv(name string) (string, error) {
+	if val, exists := os.LookupEnv(name); exists && len(val) > 0 {
+		return val, nil
+	}
+
+	return "", fmt.Errorf("required env var `%s` is not set", name)
+}
@@ -0,0 +1,135 @@
+package tmpl
+
+import (
+	"fmt"
+	"path/filepath"
+	"reflect"
+	"testing"
+)
+
+func TestReadFile(t *testing.T) {
+	expected := `foo:
+  bar: BAR
+`
+	expectedFilename := "values.yaml"
+	ctx := &Context{basePath: ".", readFile: func(filename string) ([]byte, error) {
+		if filename != expectedFilename {
+			return nil, fmt.Errorf("unexpected filename: expected=%v, actual=%s", expectedFilename, filename)
+		}
+		return []byte(expected), nil
+	}}
+	actual, err := ctx.ReadFile(expectedFilename)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("unexpected result: expected=%v, actual=%v", expected, actual)
+	}
+}
+
+func TestReadFile_PassAbsPath(t *testing.T) {
+	expected := `foo:
+  bar: BAR
+`
+	expectedFilename, _ := filepath.Abs("values.yaml")
+	ctx := &Context{basePath: ".", readFile: func(filename string) ([]byte, error) {
+		if filename != expectedFilename {
+			return nil, fmt.Errorf("unexpected filename: expected=%v, actual=%s", expectedFilename, filename)
+		}
+		return []byte(expected), nil
+	}}
+	actual, err := ctx.ReadFile(expectedFilename)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("unexpected result: expected=%v, actual=%v", expected, actual)
+	}
+}
+
+func TestToYaml(t *testing.T) {
+	expected := `foo:
+  bar: BAR
+`
+	vals := Values(map[string]interface{}{
+		"foo": map[interface{}]interface{}{
+			"bar": "BAR",
+		},
+	})
+	actual, err := ToYaml(vals)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("unexpected result: expected=%v, actual=%v", expected, actual)
+	}
+}
+
+func TestFromYaml(t *testing.T) {
+	raw := `foo:
+  bar: BAR
+`
+	expected := Values(map[string]interface{}{
+		"foo": map[interface{}]interface{}{
+			"bar": "BAR",
+		},
+	})
+	actual, err := FromYaml(raw)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("unexpected result: expected=%v, actual=%v", expected, actual)
+	}
+}
+
+func TestSetValueAtPath_OneComponent(t *testing.T) {
+	input := map[string]interface{}{
+		"foo": "",
+	}
+	expected := map[string]interface{}{
+		"foo": "FOO",
+	}
+	actual, err := SetValueAtPath("foo", "FOO", input)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("unexpected result: expected=%v, actual=%v", expected, actual)
+	}
+}
+
+func TestSetValueAtPath_TwoComponents(t *testing.T) {
+	input := map[string]interface{}{
+		"foo": map[interface{}]interface{}{
+			"bar": "",
+		},
+	}
+	expected := map[string]interface{}{
+		"foo": map[interface{}]interface{}{
+			"bar": "FOO_BAR",
+		},
+	}
+	actual, err := SetValueAtPath("foo.bar", "FOO_BAR", input)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("unexpected result: expected=%v, actual=%v", expected, actual)
+	}
+}
+
+func TestTpl(t *testing.T) {
+	text := `foo: {{ .foo }}
+`
+	expected := `foo: FOO
+`
+	ctx := &Context{basePath: "."}
+	actual, err := ctx.Tpl(text, map[string]interface{}{"foo": "FOO"})
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("unexpected result: expected=%v, actual=%v", expected, actual)
+	}
+}
@@ -0,0 +1,41 @@
+package tmpl
+
+import (
+	"bytes"
+	"github.com/Masterminds/sprig"
+	"text/template"
+)
+
+func (c *Context) stringTemplate() *template.Template {
+	funcMap := sprig.TxtFuncMap()
+	for name, f := range c.createFuncMap() {
+		funcMap[name] = f
+	}
+	tmpl := template.New("stringTemplate").Funcs(funcMap)
+	if c.preRender {
+		tmpl = tmpl.Option("missingkey=zero")
+	} else {
+		tmpl = tmpl.Option("missingkey=error")
+	}
+	return tmpl
+}
+
+func (c *Context) RenderTemplateToBuffer(s string, data ...interface{}) (*bytes.Buffer, error) {
+	var t, parseErr = c.stringTemplate().Parse(s)
+	if parseErr != nil {
+		return nil, parseErr
+	}
+
+	var tplString bytes.Buffer
+	var d interface{}
+	if len(data) > 0 {
+		d = data[0]
+	}
+	var execErr = t.Execute(&tplString, d)
+
+	if execErr != nil {
+		return &tplString, execErr
+	}
+
+	return &tplString, nil
+}
@@ -0,0 +1,252 @@
+package tmpl
+
+import (
+	"fmt"
+	"os"
+	"reflect"
+	"testing"
+)
+
+func TestRenderTemplate_Values(t *testing.T) {
+	valuesYamlContent := `foo:
+  bar: BAR
+`
+	expected := `foo:
+  bar: FOO_BAR
+`
+	expectedFilename := "values.yaml"
+	ctx := &Context{readFile: func(filename string) ([]byte, error) {
+		if filename != expectedFilename {
+			return nil, fmt.Errorf("unexpected filename: expected=%v, actual=%s", expectedFilename, filename)
+		}
+		return []byte(valuesYamlContent), nil
+	}}
+	buf, err := ctx.RenderTemplateToBuffer(`{{ readFile "values.yaml" | fromYaml | setValueAtPath "foo.bar" "FOO_BAR" | toYaml }}`)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	actual := buf.String()
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("unexpected result: expected=%v, actual=%v", expected, actual)
+	}
+}
+
+func TestRenderTemplate_WithData(t *testing.T) {
+	valuesYamlContent := `foo:
+  bar: {{ .foo.bar }}
+`
+	expected := `foo:
+  bar: FOO_BAR
+`
+	expectedFilename := "values.yaml"
+	data := map[string]interface{}{
+		"foo": map[string]interface{}{
+			"bar": "FOO_BAR",
+		},
+	}
+	ctx := &Context{readFile: func(filename string) ([]byte, error) {
+		if filename != expectedFilename {
+			return nil, fmt.Errorf("unexpected filename: expected=%v, actual=%s", expectedFilename, filename)
+		}
+		return []byte(valuesYamlContent), nil
+	}}
+	buf, err := ctx.RenderTemplateToBuffer(valuesYamlContent, data)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	actual := buf.String()
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("unexpected result: expected=%v, actual=%v", expected, actual)
+	}
+}
+
+func TestRenderTemplate_AccessingMissingKeyWithGetOrNil(t *testing.T) {
+	valuesYamlContent := `foo:
+  bar: {{ . | getOrNil "foo.bar" }}
+`
+	expected := `foo:
+  bar: <no value>
+`
+	expectedFilename := "values.yaml"
+	data := map[string]interface{}{}
+	ctx := &Context{readFile: func(filename string) ([]byte, error) {
+		if filename != expectedFilename {
+			return nil, fmt.Errorf("unexpected filename: expected=%v, actual=%s", expectedFilename, filename)
+		}
+		return []byte(valuesYamlContent), nil
+	}}
+	buf, err := ctx.RenderTemplateToBuffer(valuesYamlContent, data)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	actual := buf.String()
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("unexpected result: expected=%v, actual=%v", expected, actual)
+	}
+}
+
+func TestRenderTemplate_Defaulting(t *testing.T) {
+	valuesYamlContent := `foo:
+  bar: {{ . | getOrNil "foo.bar" | default "DEFAULT" }}
+`
+	expected := `foo:
+  bar: DEFAULT
+`
+	expectedFilename := "values.yaml"
+	data := map[string]interface{}{}
+	ctx := &Context{readFile: func(filename string) ([]byte, error) {
+		if filename != expectedFilename {
+			return nil, fmt.Errorf("unexpected filename: expected=%v, actual=%s", expectedFilename, filename)
+		}
+		return []byte(valuesYamlContent), nil
+	}}
+	buf, err := ctx.RenderTemplateToBuffer(valuesYamlContent, data)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	actual := buf.String()
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("unexpected result: expected=%v, actual=%v", expected, actual)
+	}
+}
+
+func renderTemplateToString(s string, data ...interface{}) (string, error) {
+	ctx := &Context{readFile: func(filename string) ([]byte, error) {
+		return nil, fmt.Errorf("unexpected call to readFile: filename=%s", filename)
+	}}
+	tplString, err := ctx.RenderTemplateToBuffer(s, data...)
+	if err != nil {
+		return "", err
+	}
+	return tplString.String(), nil
+}
+
+func Test_renderTemplateToString(t *testing.T) {
+	type args struct {
+		s    string
+		envs map[string]string
+		data interface{}
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    string
+		wantErr bool
+	}{
+		{
+			name: "simple replacement",
+			args: args{
+				s: "{{ env \"HF_TEST_VAR\" }}",
+				envs: map[string]string{
+					"HF_TEST_VAR": "content",
+				},
+			},
+			want:    "content",
+			wantErr: false,
+		},
+		{
+			name: "two replacements",
+			args: args{
+				s: "{{ env \"HF_TEST_ALPHA\" }}{{ env \"HF_TEST_BETA\" }}",
+				envs: map[string]string{
+					"HF_TEST_ALPHA": "first",
+					"HF_TEST_BETA":  "second",
+				},
+			},
+			want:    "firstsecond",
+			wantErr: false,
+		},
+		{
+			name: "replacement and comment",
+			args: args{
+				s: "{{ env \"HF_TEST_ALPHA\" }}{{/* comment */}}",
+				envs: map[string]string{
+					"HF_TEST_ALPHA": "first",
+				},
+			},
+			want:    "first",
+			wantErr: false,
+		},
+		{
+			name: "global template function",
+			args: args{
+				s: "{{ env \"HF_TEST_ALPHA\" | len }}",
+				envs: map[string]string{
+					"HF_TEST_ALPHA": "abcdefg",
+				},
+			},
+			want:    "7",
+			wantErr: false,
+		},
+		{
+			name: "get",
+			args: args{
+				s:    `{{ . | get "Foo" }}, {{ . | get "Bar" "2" }}`,
+				envs: map[string]string{},
+				data: map[string]interface{}{
+					"Foo": "1",
+				},
+			},
+			want:    "1, 2",
+			wantErr: false,
+		},
+		{
+			name: "env var not set",
+			args: args{
+				s: "{{ env \"HF_TEST_NONE\" }}",
+				envs: map[string]string{
+					"HF_TEST_THIS": "first",
+				},
+			},
+			want: "",
+		},
+		{
+			name: "undefined function",
+			args: args{
+				s: "{{ env foo }}",
+				envs: map[string]string{
+					"foo": "bar",
+				},
+			},
+			wantErr: true,
+		},
+		{
+			name: "required env var",
+			args: args{
+				s: "{{ requiredEnv \"HF_TEST\" }}",
+				envs: map[string]string{
+					"HF_TEST": "value",
+				},
+			},
+			want:    "value",
+			wantErr: false,
+		},
+		{
+			name: "required env var not set",
+			args: args{
+				s:    "{{ requiredEnv \"HF_TEST_NONE\" }}",
+				envs: map[string]string{},
+			},
+			wantErr: true,
+		},
+	}
+	for i := range tests {
+		tt := tests[i]
+		t.Run(tt.name, func(t *testing.T) {
+			for k, v := range tt.args.envs {
+				err := os.Setenv(k, v)
+				if err != nil {
+					t.Error("renderTemplateToString() could not set env var for testing")
+				}
+			}
+			got, err := renderTemplateToString(tt.args.s, tt.args.data)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("renderTemplateToString() for %s error = %v, wantErr %v", tt.name, err, tt.wantErr)
+				return
+			}
+			if got != tt.want {
+				t.Errorf("renderTemplateToString() for %s = %v, want %v", tt.name, got, tt.want)
+			}
+		})
+	}
+}
@@ -0,0 +1,80 @@
+package tmpl
+
+import (
+	"bytes"
+	"io/ioutil"
+
+	"fmt"
+	"strings"
+)
+
+type FileRenderer struct {
+	ReadFile func(string) ([]byte, error)
+	Context  *Context
+	Data     interface{}
+}
+
+func NewFileRenderer(readFile func(filename string) ([]byte, error), basePath string, data interface{}) *FileRenderer {
+	return &FileRenderer{
+		ReadFile: readFile,
+		Context: &Context{
+			basePath: basePath,
+			readFile: readFile,
+		},
+		Data: data,
+	}
+}
+
+func NewFirstPassRenderer(basePath string, data interface{}) *FileRenderer {
+	return &FileRenderer{
+		ReadFile: ioutil.ReadFile,
+		Context: &Context{
+			preRender: true,
+			basePath:  basePath,
+			readFile:  ioutil.ReadFile,
+		},
+		Data: data,
+	}
+}
+
+func (r *FileRenderer) RenderTemplateFileToBuffer(file string) (*bytes.Buffer, error) {
+	content, err := r.ReadFile(file)
+	if err != nil {
+		return nil, err
+	}
+
+	return r.RenderTemplateContentToBuffer(content)
+}
+
+// RenderToBytes loads the content of the file.
+// If its extension is `gotmpl` it treats the content as a go template and renders it.
+func (r *FileRenderer) RenderToBytes(path string) ([]byte, error) {
+	var yamlBytes []byte
+	splits := strings.Split(path, ".")
+	if len(splits) > 0 && splits[len(splits)-1] == "gotmpl" {
+		yamlBuf, err := r.RenderTemplateFileToBuffer(path)
+		if err != nil {
+			return nil, fmt.Errorf("failed to render [%s], because of %v", path, err)
+		}
+		yamlBytes = yamlBuf.Bytes()
+	} else {
+		var err error
+		yamlBytes, err = r.ReadFile(path)
+		if err != nil {
+			return nil, fmt.Errorf("failed to load [%s]: %v", path, err)
+		}
+	}
+	return yamlBytes, nil
+}
+
+func (r *FileRenderer) RenderTemplateContentToBuffer(content []byte) (*bytes.Buffer, error) {
+	return r.Context.RenderTemplateToBuffer(string(content), r.Data)
+}
+
+func (r *FileRenderer) RenderTemplateContentToString(content []byte) (string, error) {
+	buf, err := r.Context.RenderTemplateToBuffer(string(content), r.Data)
+	if err != nil {
+		return "", err
+	}
+	return buf.String(), nil
+}
@@ -0,0 +1,67 @@
+package tmpl
+
+import (
+	"fmt"
+	"github.com/roboll/helmfile/pkg/environment"
+	"reflect"
+	"testing"
+)
+
+var emptyEnvTmplData = map[string]interface{}{
+	"Environment": environment.EmptyEnvironment,
+	"Namespace":   "",
+}
+
+func TestRenderToBytes_Gotmpl(t *testing.T) {
+	valuesYamlTmplContent := `foo:
+  bar: '{{ readFile "data.txt" }}'
+`
+	dataFileContent := "FOO_BAR"
+	expected := `foo:
+  bar: 'FOO_BAR'
+`
+	dataFile := "data.txt"
+	valuesTmplFile := "values.yaml.gotmpl"
+	r := NewFileRenderer(func(filename string) ([]byte, error) {
+		switch filename {
+		case valuesTmplFile:
+			return []byte(valuesYamlTmplContent), nil
+		case dataFile:
+			return []byte(dataFileContent), nil
+		}
+		return nil, fmt.Errorf("unexpected filename: expected=%v or %v, actual=%s", dataFile, valuesTmplFile, filename)
+	}, "", emptyEnvTmplData)
+	buf, err := r.RenderToBytes(valuesTmplFile)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	actual := string(buf)
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("unexpected result: expected=%v, actual=%v", expected, actual)
+	}
+}
+
+func TestRenderToBytes_Yaml(t *testing.T) {
+	valuesYamlContent := `foo:
+  bar: '{{ readFile "data.txt" }}'
+`
+	expected := `foo:
+  bar: '{{ readFile "data.txt" }}'
+`
+	valuesFile := "values.yaml"
+	r := NewFileRenderer(func(filename string) ([]byte, error) {
+		switch filename {
+		case valuesFile:
+			return []byte(valuesYamlContent), nil
+		}
+		return nil, fmt.Errorf("unexpected filename: expected=%v, actual=%s", valuesFile, filename)
+	}, "", emptyEnvTmplData)
+	buf, err := r.RenderToBytes(valuesFile)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	actual := string(buf)
+	if !reflect.DeepEqual(actual, expected) {
+		t.Errorf("unexpected result: expected=%v, actual=%v", expected, actual)
+	}
+}
@@ -0,0 +1,91 @@
+package tmpl
+
+import (
+	"fmt"
+	"reflect"
+	"strings"
+)
+
+type noValueError struct {
+	msg string
+}
+
+func (e *noValueError) Error() string {
+	return e.msg
+}
+
+func get(path string, varArgs ...interface{}) (interface{}, error) {
+	var defSet bool
+	var def interface{}
+	var obj interface{}
+	switch len(varArgs) {
+	case 1:
+		defSet = false
+		def = nil
+		obj = varArgs[0]
+	case 2:
+		defSet = true
+		def = varArgs[0]
+		obj = varArgs[1]
+	default:
+		return nil, fmt.Errorf("unexpected number of args pased to the template function get(path, [def, ]obj): expected 1 or 2, got %d, args was %v", len(varArgs), varArgs)
+	}
+
+	if path == "" {
+		return obj, nil
+	}
+	keys := strings.Split(path, ".")
+	var v interface{}
+	var ok bool
+	switch typedObj := obj.(type) {
+	case map[string]interface{}:
+		v, ok = typedObj[keys[0]]
+		if !ok {
+			if defSet {
+				return def, nil
+			}
+			return nil, &noValueError{fmt.Sprintf("no value exist for key \"%s\" in %v", keys[0], typedObj)}
+		}
+	case map[interface{}]interface{}:
+		v, ok = typedObj[keys[0]]
+		if !ok {
+			if defSet {
+				return def, nil
+			}
+			return nil, &noValueError{fmt.Sprintf("no value exist for key \"%s\" in %v", keys[0], typedObj)}
+		}
+	default:
+		maybeStruct := reflect.ValueOf(typedObj)
+		if maybeStruct.Kind() != reflect.Struct {
+			return nil, &noValueError{fmt.Sprintf("unexpected type(%v) of value for key \"%s\": it must be either map[string]interface{} or any struct", reflect.TypeOf(obj), keys[0])}
+		} else if maybeStruct.NumField() < 1 {
+			return nil, &noValueError{fmt.Sprintf("no accessible struct fields for key \"%s\"", keys[0])}
+		}
+		f := maybeStruct.FieldByName(keys[0])
+		if !f.IsValid() {
+			if defSet {
+				return def, nil
+			}
+			return nil, &noValueError{fmt.Sprintf("no field named \"%s\" exist in %v", keys[0], typedObj)}
+		}
+		v = f.Interface()
+	}
+
+	if defSet {
+		return get(strings.Join(keys[1:], "."), def, v)
+	}
+	return get(strings.Join(keys[1:], "."), v)
+}
+
+func getOrNil(path string, o interface{}) (interface{}, error) {
+	v, err := get(path, o)
+	if err != nil {
+		switch err.(type) {
+		case *noValueError:
+			return nil, nil
+		default:
+			return nil, err
+		}
+	}
+	return v, nil
+}
@@ -0,0 +1,128 @@
+package tmpl
+
+import (
+	"testing"
+)
+
+type EmptyStruct struct {
+}
+
+func TestGetStruct(t *testing.T) {
+	type Foo struct{ Bar string }
+
+	obj := struct{ Foo }{Foo{Bar: "Bar"}}
+
+	v1, err := get("Foo.Bar", obj)
+
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if v1 != "Bar" {
+		t.Errorf("unexpected value for path Foo.Bar in %v: expected=Bar, actual=%v", obj, v1)
+	}
+
+	_, err = get("Foo.baz", obj)
+
+	if err == nil {
+		t.Errorf("expected error but was not occurred")
+	}
+
+	_, err = get("foo", EmptyStruct{})
+
+	if err == nil {
+		t.Errorf("expected error but was not occurred")
+	}
+}
+
+func TestGetMap(t *testing.T) {
+	obj := map[string]interface{}{"Foo": map[string]interface{}{"Bar": "Bar"}}
+
+	v1, err := get("Foo.Bar", obj)
+
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if v1 != "Bar" {
+		t.Errorf("unexpected value for path Foo.Bar in %v: expected=Bar, actual=%v", obj, v1)
+	}
+
+	_, err = get("Foo.baz", obj)
+
+	if err == nil {
+		t.Errorf("expected error but was not occurred")
+	}
+}
+
+func TestGet_Default(t *testing.T) {
+	obj := map[string]interface{}{"Foo": map[string]interface{}{}, "foo": 1}
+
+	v1, err := get("Foo.Bar", "Bar", obj)
+
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if v1 != "Bar" {
+		t.Errorf("unexpected value for path Foo.Bar in %v: expected=Bar, actual=%v", obj, v1)
+	}
+
+	v2, err := get("Baz", "Baz", obj)
+
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if v2 != "Baz" {
+		t.Errorf("unexpected value for path Baz in %v: expected=Baz, actual=%v", obj, v2)
+	}
+
+	_, err = get("foo.Bar", "fooBar", obj)
+
+	if err == nil {
+		t.Errorf("expected error but was not occurred")
+	}
+}
+
+func TestGetOrNilStruct(t *testing.T) {
+	type Foo struct{ Bar string }
+
+	obj := struct{ Foo }{Foo{Bar: "Bar"}}
+
+	v1, err := getOrNil("Foo.Bar", obj)
+
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if v1 != "Bar" {
+		t.Errorf("unexpected value for path Foo.Bar in %v: expected=Bar, actual=%v", obj, v1)
+	}
+
+	v2, err := getOrNil("Foo.baz", obj)
+
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if v2 != nil {
+		t.Errorf("unexpected value for path Foo.baz in %v: expected=nil, actual=%v", obj, v2)
+	}
+}
+
+func TestGetOrNilMap(t *testing.T) {
+	obj := map[string]interface{}{"Foo": map[string]interface{}{"Bar": "Bar"}}
+
+	v1, err := getOrNil("Foo.Bar", obj)
+
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if v1 != "Bar" {
+		t.Errorf("unexpected value for path Foo.Bar in %v: expected=Bar, actual=%v", obj, v1)
+	}
+
+	v2, err := getOrNil("Foo.baz", obj)
+
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if v2 != nil {
+		t.Errorf("unexpected value for path Foo.baz in %v: expected=nil, actual=%v", obj, v2)
+	}
+}
@@ -0,0 +1,30 @@
+package tmpl
+
+type templateTextRenderer struct {
+	ReadText func(string) ([]byte, error)
+	Context  *Context
+	Data     interface{}
+}
+
+type TextRenderer interface {
+	RenderTemplateText(text string) (string, error)
+}
+
+func NewTextRenderer(readFile func(filename string) ([]byte, error), basePath string, data interface{}) *templateTextRenderer {
+	return &templateTextRenderer{
+		ReadText: readFile,
+		Context: &Context{
+			basePath: basePath,
+			readFile: readFile,
+		},
+		Data: data,
+	}
+}
+
+func (r *templateTextRenderer) RenderTemplateText(text string) (string, error) {
+	buf, err := r.Context.RenderTemplateToBuffer(text, r.Data)
+	if err != nil {
+		return "", err
+	}
+	return buf.String(), nil
+}
@@ -1,839 +0,0 @@
-package state
-
-import (
-	"errors"
-	"fmt"
-	"io/ioutil"
-	"os"
-	"path"
-	"path/filepath"
-	"strconv"
-	"strings"
-	"sync"
-	"text/template"
-
-	"github.com/Masterminds/sprig"
-
-	"github.com/roboll/helmfile/helmexec"
-
-	"bytes"
-	"regexp"
-
-	"go.uber.org/zap"
-	yaml "gopkg.in/yaml.v2"
-)
-
-// HelmState structure for the helmfile
-type HelmState struct {
-	BaseChartPath      string
-	FilePath           string
-	HelmDefaults       HelmSpec         `yaml:"helmDefaults"`
-	Context            string           `yaml:"context"`
-	DeprecatedReleases []ReleaseSpec    `yaml:"charts"`
-	Namespace          string           `yaml:"namespace"`
-	Repositories       []RepositorySpec `yaml:"repositories"`
-	Releases           []ReleaseSpec    `yaml:"releases"`
-
-	logger *zap.SugaredLogger
-}
-
-// HelmSpec to defines helmDefault values
-type HelmSpec struct {
-	KubeContext     string   `yaml:"kubeContext"`
-	TillerNamespace string   `yaml:"tillerNamespace"`
-	Args            []string `yaml:"args"`
-	Verify          bool     `yaml:"verify"`
-	// Wait, if set to true, will wait until all Pods, PVCs, Services, and minimum number of Pods of a Deployment are in a ready state before marking the release as successful
-	Wait bool `yaml:"wait"`
-	// Timeout is the time in seconds to wait for any individual Kubernetes operation (like Jobs for hooks, and waits on pod/pvc/svc/deployment readiness) (default 300)
-	Timeout int `yaml:"timeout"`
-	// RecreatePods, when set to true, instruct helmfile to perform pods restart for the resource if applicable
-	RecreatePods bool `yaml:"recreatePods"`
-	// Force, when set to true, forces resource update through delete/recreate if needed
-	Force bool `yaml:"force"`
-}
-
-// RepositorySpec that defines values for a helm repo
-type RepositorySpec struct {
-	Name     string `yaml:"name"`
-	URL      string `yaml:"url"`
-	CertFile string `yaml:"certFile"`
-	KeyFile  string `yaml:"keyFile"`
-	Username string `yaml:"username"`
-	Password string `yaml:"password"`
-}
-
-// ReleaseSpec defines the structure of a helm release
-type ReleaseSpec struct {
-	// Chart is the name of the chart being installed to create this release
-	Chart   string `yaml:"chart"`
-	Version string `yaml:"version"`
-	Verify  *bool  `yaml:"verify"`
-	// Wait, if set to true, will wait until all Pods, PVCs, Services, and minimum number of Pods of a Deployment are in a ready state before marking the release as successful
-	Wait *bool `yaml:"wait"`
-	// Timeout is the time in seconds to wait for any individual Kubernetes operation (like Jobs for hooks, and waits on pod/pvc/svc/deployment readiness) (default 300)
-	Timeout *int `yaml:"timeout"`
-	// RecreatePods, when set to true, instruct helmfile to perform pods restart for the resource if applicable
-	RecreatePods *bool `yaml:"recreatePods"`
-	// Force, when set to true, forces resource update through delete/recreate if needed
-	Force *bool `yaml:"force"`
-
-	// Name is the name of this release
-	Name      string            `yaml:"name"`
-	Namespace string            `yaml:"namespace"`
-	Labels    map[string]string `yaml:"labels"`
-	Values    []interface{}     `yaml:"values"`
-	Secrets   []string          `yaml:"secrets"`
-	SetValues []SetValue        `yaml:"set"`
-
-	// The 'env' section is not really necessary any longer, as 'set' would now provide the same functionality
-	EnvValues []SetValue `yaml:"env"`
-
-	// generatedValues are values that need cleaned up on exit
-	generatedValues []string
-}
-
-// SetValue are the key values to set on a helm release
-type SetValue struct {
-	Name   string   `yaml:"name"`
-	Value  string   `yaml:"value"`
-	File   string   `yaml:"file"`
-	Values []string `yaml:"values"`
-}
-
-// CreateFromTemplateFile loads the helmfile from disk and processes the template
-func CreateFromTemplateFile(file string, logger *zap.SugaredLogger) (*HelmState, error) {
-	yamlBuf, err := RenderTemplateFileToBuffer(file)
-	if err != nil {
-		return nil, err
-	}
-
-	return CreateFromYaml(yamlBuf.Bytes(), file, logger)
-}
-
-func CreateFromYaml(content []byte, file string, logger *zap.SugaredLogger) (*HelmState, error) {
-	var state HelmState
-
-	state.BaseChartPath, _ = filepath.Abs(filepath.Dir(file))
-	if err := yaml.UnmarshalStrict(content, &state); err != nil {
-		return nil, err
-	}
-	state.FilePath = file
-
-	if len(state.DeprecatedReleases) > 0 {
-		if len(state.Releases) > 0 {
-			return nil, fmt.Errorf("failed to parse %s: you can't specify both `charts` and `releases` sections", file)
-		}
-		state.Releases = state.DeprecatedReleases
-		state.DeprecatedReleases = []ReleaseSpec{}
-	}
-
-	state.logger = logger
-
-	return &state, nil
-}
-
-func stringTemplate() *template.Template {
-	funcMap := sprig.TxtFuncMap()
-	alterFuncMap(&funcMap)
-	return template.New("stringTemplate").Funcs(funcMap)
-}
-
-func alterFuncMap(funcMap *template.FuncMap) {
-	(*funcMap)["requiredEnv"] = getRequiredEnv
-}
-
-func getRequiredEnv(name string) (string, error) {
-	if val, exists := os.LookupEnv(name); exists && len(val) > 0 {
-		return val, nil
-	}
-
-	return "", fmt.Errorf("required env var `%s` is not set", name)
-}
-
-func RenderTemplateFileToBuffer(file string) (*bytes.Buffer, error) {
-	content, err := ioutil.ReadFile(file)
-	if err != nil {
-		return nil, err
-	}
-
-	return renderTemplateToBuffer(string(content))
-}
-
-func renderTemplateToBuffer(s string) (*bytes.Buffer, error) {
-	var t, parseErr = stringTemplate().Parse(s)
-	if parseErr != nil {
-		return nil, parseErr
-	}
-
-	var tplString bytes.Buffer
-	var execErr = t.Execute(&tplString, nil)
-
-	if execErr != nil {
-		return nil, execErr
-	}
-
-	return &tplString, nil
-}
-
-func renderTemplateString(s string) (string, error) {
-	tplString, err := renderTemplateToBuffer(s)
-	if err != nil {
-		return "", err
-	}
-	return tplString.String(), nil
-}
-
-func (state *HelmState) applyDefaultsTo(spec *ReleaseSpec) {
-	if state.Namespace != "" {
-		spec.Namespace = state.Namespace
-	}
-}
-
-// SyncRepos will update the given helm releases
-func (state *HelmState) SyncRepos(helm helmexec.Interface) []error {
-	errs := []error{}
-
-	for _, repo := range state.Repositories {
-		if err := helm.AddRepo(repo.Name, repo.URL, repo.CertFile, repo.KeyFile, repo.Username, repo.Password); err != nil {
-			errs = append(errs, err)
-		}
-	}
-
-	if len(errs) != 0 {
-		return errs
-	}
-
-	if err := helm.UpdateRepo(); err != nil {
-		return []error{err}
-	}
-	return nil
-}
-
-type ReleaseError struct {
-	*ReleaseSpec
-	underlying error
-}
-
-func (e *ReleaseError) Error() string {
-	return e.underlying.Error()
-}
-
-// SyncReleases wrapper for executing helm upgrade on the releases
-func (state *HelmState) SyncReleases(helm helmexec.Interface, additionalValues []string, workerLimit int) []error {
-	errs := []error{}
-	jobQueue := make(chan *ReleaseSpec)
-	doneQueue := make(chan bool)
-	errQueue := make(chan *ReleaseError)
-
-	if workerLimit < 1 {
-		workerLimit = len(state.Releases)
-	}
-	for w := 1; w <= workerLimit; w++ {
-		go func() {
-			for release := range jobQueue {
-				state.applyDefaultsTo(release)
-				flags, flagsErr := state.flagsForUpgrade(helm, release)
-				if flagsErr != nil {
-					errQueue <- &ReleaseError{release, flagsErr}
-					doneQueue <- true
-					continue
-				}
-
-				haveValueErr := false
-				for _, value := range additionalValues {
-					valfile, err := filepath.Abs(value)
-					if err != nil {
-						errQueue <- &ReleaseError{release, err}
-						haveValueErr = true
-					}
-
-					if _, err := os.Stat(valfile); os.IsNotExist(err) {
-						errQueue <- &ReleaseError{release, err}
-						haveValueErr = true
-					}
-					flags = append(flags, "--values", valfile)
-				}
-
-				if haveValueErr {
-					doneQueue <- true
-					continue
-				}
-
-				chart := normalizeChart(state.BaseChartPath, release.Chart)
-				if err := helm.SyncRelease(release.Name, chart, flags...); err != nil {
-					errQueue <- &ReleaseError{release, err}
-				}
-				doneQueue <- true
-			}
-		}()
-	}
-
-	go func() {
-		for i := 0; i < len(state.Releases); i++ {
-			jobQueue <- &state.Releases[i]
-		}
-		close(jobQueue)
-	}()
-
-	for i := 0; i < len(state.Releases); {
-		select {
-		case err := <-errQueue:
-			errs = append(errs, err)
-		case <-doneQueue:
-			i++
-		}
-	}
-
-	if len(errs) != 0 {
-		return errs
-	}
-
-	return nil
-}
-
-// DiffReleases wrapper for executing helm diff on the releases
-func (state *HelmState) DiffReleases(helm helmexec.Interface, additionalValues []string, workerLimit int, detailedExitCode bool) []error {
-	var wgRelease sync.WaitGroup
-	var wgError sync.WaitGroup
-	errs := []error{}
-	jobQueue := make(chan *ReleaseSpec, len(state.Releases))
-	errQueue := make(chan error)
-
-	if workerLimit < 1 {
-		workerLimit = len(state.Releases)
-	}
-
-	wgRelease.Add(len(state.Releases))
-
-	for w := 1; w <= workerLimit; w++ {
-		go func() {
-			for release := range jobQueue {
-				errs := []error{}
-
-				state.applyDefaultsTo(release)
-
-				flags, err := state.flagsForDiff(helm, state.BaseChartPath, release)
-				if err != nil {
-					errs = append(errs, err)
-				}
-
-				for _, value := range additionalValues {
-					valfile, err := filepath.Abs(value)
-					if err != nil {
-						errs = append(errs, err)
-					}
-
-					if _, err := os.Stat(valfile); os.IsNotExist(err) {
-						errs = append(errs, err)
-					}
-					flags = append(flags, "--values", valfile)
-				}
-
-				if detailedExitCode {
-					flags = append(flags, "--detailed-exitcode")
-				}
-
-				if len(errs) == 0 {
-					if err := helm.DiffRelease(release.Name, normalizeChart(state.BaseChartPath, release.Chart), flags...); err != nil {
-						errs = append(errs, err)
-					}
-				}
-				for _, err := range errs {
-					errQueue <- err
-				}
-				wgRelease.Done()
-			}
-		}()
-	}
-	wgError.Add(1)
-	go func() {
-		for err := range errQueue {
-			errs = append(errs, err)
-		}
-		wgError.Done()
-	}()
-
-	for i := 0; i < len(state.Releases); i++ {
-		jobQueue <- &state.Releases[i]
-	}
-
-	close(jobQueue)
-	wgRelease.Wait()
-
-	close(errQueue)
-	wgError.Wait()
-
-	if len(errs) != 0 {
-		return errs
-	}
-
-	return nil
-}
-
-// LintReleases wrapper for executing helm lint on the releases
-func (state *HelmState) LintReleases(helm helmexec.Interface, additionalValues []string, workerLimit int) []error {
-	var wgRelease sync.WaitGroup
-	var wgError sync.WaitGroup
-	errs := []error{}
-	jobQueue := make(chan *ReleaseSpec, len(state.Releases))
-	errQueue := make(chan error)
-
-	if workerLimit < 1 {
-		workerLimit = len(state.Releases)
-	}
-
-	wgRelease.Add(len(state.Releases))
-
-	// Create tmp directory and bail immediately if it fails
-	dir, err := ioutil.TempDir("", "")
-	if err != nil {
-		errs = append(errs, err)
-		return errs
-	}
-	defer os.RemoveAll(dir)
-
-	for w := 1; w <= workerLimit; w++ {
-		go func() {
-			for release := range jobQueue {
-				errs := []error{}
-				flags, err := state.flagsForLint(helm, state.BaseChartPath, release)
-				if err != nil {
-					errs = append(errs, err)
-				}
-				for _, value := range additionalValues {
-					valfile, err := filepath.Abs(value)
-					if err != nil {
-						errs = append(errs, err)
-					}
-
-					if _, err := os.Stat(valfile); os.IsNotExist(err) {
-						errs = append(errs, err)
-					}
-					flags = append(flags, "--values", valfile)
-				}
-
-				chartPath := ""
-				if isLocalChart(release.Chart) {
-					chartPath = normalizeChart(state.BaseChartPath, release.Chart)
-				} else {
-					fetchFlags := []string{}
-					if release.Version != "" {
-						chartPath = path.Join(dir, release.Name, release.Version, release.Chart)
-						fetchFlags = append(fetchFlags, "--version", release.Version)
-					} else {
-						chartPath = path.Join(dir, release.Name, "latest", release.Chart)
-					}
-
-					// only fetch chart if it is not already fetched
-					if _, err := os.Stat(chartPath); os.IsNotExist(err) {
-						fetchFlags = append(fetchFlags, "--untar", "--untardir", chartPath)
-						if err := helm.Fetch(release.Chart, fetchFlags...); err != nil {
-							errs = append(errs, err)
-						}
-					}
-					chartPath = path.Join(chartPath, chartNameWithoutRepository(release.Chart))
-				}
-
-				if len(errs) == 0 {
-					if err := helm.Lint(chartPath, flags...); err != nil {
-						errs = append(errs, err)
-					}
-				}
-				for _, err := range errs {
-					errQueue <- err
-				}
-				wgRelease.Done()
-			}
-		}()
-	}
-	wgError.Add(1)
-	go func() {
-		for err := range errQueue {
-			errs = append(errs, err)
-		}
-		wgError.Done()
-	}()
-
-	for i := 0; i < len(state.Releases); i++ {
-		jobQueue <- &state.Releases[i]
-	}
-
-	close(jobQueue)
-	wgRelease.Wait()
-
-	close(errQueue)
-	wgError.Wait()
-
-	if len(errs) != 0 {
-		return errs
-	}
-
-	return nil
-}
-
-func (state *HelmState) ReleaseStatuses(helm helmexec.Interface, workerLimit int) []error {
-	var errs []error
-	jobQueue := make(chan ReleaseSpec)
-	doneQueue := make(chan bool)
-	errQueue := make(chan error)
-
-	if workerLimit < 1 {
-		workerLimit = len(state.Releases)
-	}
-	for w := 1; w <= workerLimit; w++ {
-		go func() {
-			for release := range jobQueue {
-				if err := helm.ReleaseStatus(release.Name); err != nil {
-					errQueue <- err
-				}
-				doneQueue <- true
-			}
-		}()
-	}
-
-	go func() {
-		for _, release := range state.Releases {
-			jobQueue <- release
-		}
-		close(jobQueue)
-	}()
-
-	for i := 0; i < len(state.Releases); {
-		select {
-		case err := <-errQueue:
-			errs = append(errs, err)
-		case <-doneQueue:
-			i++
-		}
-	}
-
-	if len(errs) != 0 {
-		return errs
-	}
-
-	return nil
-}
-
-// DeleteReleases wrapper for executing helm delete on the releases
-func (state *HelmState) DeleteReleases(helm helmexec.Interface, purge bool) []error {
-	var wg sync.WaitGroup
-	errs := []error{}
-
-	for _, release := range state.Releases {
-		wg.Add(1)
-		go func(wg *sync.WaitGroup, release ReleaseSpec) {
-			flags := []string{}
-			if purge {
-				flags = append(flags, "--purge")
-			}
-			if err := helm.DeleteRelease(release.Name, flags...); err != nil {
-				errs = append(errs, err)
-			}
-			wg.Done()
-		}(&wg, release)
-	}
-	wg.Wait()
-
-	if len(errs) != 0 {
-		return errs
-	}
-
-	return nil
-}
-
-// TestReleases wrapper for executing helm test on the releases
-func (state *HelmState) TestReleases(helm helmexec.Interface, cleanup bool, timeout int) []error {
-	var wg sync.WaitGroup
-	errs := []error{}
-
-	for _, release := range state.Releases {
-		wg.Add(1)
-		go func(wg *sync.WaitGroup, release ReleaseSpec) {
-			flags := []string{}
-			if cleanup {
-				flags = append(flags, "--cleanup")
-			}
-			flags = append(flags, "--timeout", strconv.Itoa(timeout))
-			if err := helm.TestRelease(release.Name, flags...); err != nil {
-				errs = append(errs, err)
-			}
-			wg.Done()
-		}(&wg, release)
-	}
-	wg.Wait()
-
-	if len(errs) != 0 {
-		return errs
-	}
-
-	return nil
-}
-
-// Clean will remove any generated secrets
-func (state *HelmState) Clean() []error {
-	errs := []error{}
-
-	for _, release := range state.Releases {
-		for _, value := range release.generatedValues {
-			err := os.Remove(value)
-			if err != nil {
-				errs = append(errs, err)
-			}
-		}
-	}
-
-	if len(errs) != 0 {
-		return errs
-	}
-
-	return nil
-}
-
-// FilterReleases allows for the execution of helm commands against a subset of the releases in the helmfile.
-func (state *HelmState) FilterReleases(labels []string) error {
-	var filteredReleases []ReleaseSpec
-	releaseSet := map[string]ReleaseSpec{}
-	filters := []ReleaseFilter{}
-	for _, label := range labels {
-		f, err := ParseLabels(label)
-		if err != nil {
-			return err
-		}
-		filters = append(filters, f)
-	}
-	for _, r := range state.Releases {
-		if r.Labels == nil {
-			r.Labels = map[string]string{}
-		}
-		// Let the release name be used as a tag
-		r.Labels["name"] = r.Name
-		for _, f := range filters {
-			if r.Labels == nil {
-				r.Labels = map[string]string{}
-			}
-			if f.Match(r) {
-				releaseSet[r.Name] = r
-				continue
-			}
-		}
-	}
-	for _, r := range releaseSet {
-		filteredReleases = append(filteredReleases, r)
-	}
-	state.Releases = filteredReleases
-	if len(filteredReleases) == 0 {
-		state.logger.Debugf("specified selector did not match any releases in %s\n", state.FilePath)
-		return nil
-	}
-	return nil
-}
-
-// UpdateDeps wrapper for updating dependencies on the releases
-func (state *HelmState) UpdateDeps(helm helmexec.Interface) []error {
-	errs := []error{}
-
-	for _, release := range state.Releases {
-		if isLocalChart(release.Chart) {
-			if err := helm.UpdateDeps(normalizeChart(state.BaseChartPath, release.Chart)); err != nil {
-				errs = append(errs, err)
-			}
-		}
-	}
-	if len(errs) != 0 {
-		return errs
-	}
-	return nil
-}
-
-// normalizeChart allows for the distinction between a file path reference and repository references.
-// - Any single (or double character) followed by a `/` will be considered a local file reference and
-// 	 be constructed relative to the `base path`.
-// - Everything else is assumed to be an absolute path or an actual <repository>/<chart> reference.
-func normalizeChart(basePath, chart string) string {
-	regex, _ := regexp.Compile("^[.]?./")
-	if !regex.MatchString(chart) {
-		return chart
-	}
-	return filepath.Join(basePath, chart)
-}
-
-func isLocalChart(chart string) bool {
-	_, err := os.Stat(chart)
-	return err == nil
-}
-
-func chartNameWithoutRepository(chart string) string {
-	chartSplit := strings.Split(chart, "/")
-	return chartSplit[len(chartSplit)-1]
-}
-
-func (state *HelmState) flagsForUpgrade(helm helmexec.Interface, release *ReleaseSpec) ([]string, error) {
-	flags := []string{}
-	if release.Version != "" {
-		flags = append(flags, "--version", release.Version)
-	}
-
-	if release.Verify != nil && *release.Verify || state.HelmDefaults.Verify {
-		flags = append(flags, "--verify")
-	}
-
-	if release.Wait != nil && *release.Wait || state.HelmDefaults.Wait {
-		flags = append(flags, "--wait")
-	}
-
-	timeout := state.HelmDefaults.Timeout
-	if release.Timeout != nil {
-		timeout = *release.Timeout
-	}
-	if timeout != 0 {
-		flags = append(flags, "--timeout", fmt.Sprintf("%d", timeout))
-	}
-
-	if release.Force != nil && *release.Force || state.HelmDefaults.Force {
-		flags = append(flags, "--force")
-	}
-
-	if release.RecreatePods != nil && *release.RecreatePods || state.HelmDefaults.RecreatePods {
-		flags = append(flags, "--recreate-pods")
-	}
-
-	common, err := state.namespaceAndValuesFlags(helm, state.BaseChartPath, release)
-	if err != nil {
-		return nil, err
-	}
-	return append(flags, common...), nil
-}
-
-func (state *HelmState) flagsForDiff(helm helmexec.Interface, basePath string, release *ReleaseSpec) ([]string, error) {
-	flags := []string{}
-	if release.Version != "" {
-		flags = append(flags, "--version", release.Version)
-	}
-	common, err := state.namespaceAndValuesFlags(helm, basePath, release)
-	if err != nil {
-		return nil, err
-	}
-	return append(flags, common...), nil
-}
-
-func (state *HelmState) flagsForLint(helm helmexec.Interface, basePath string, release *ReleaseSpec) ([]string, error) {
-	return state.namespaceAndValuesFlags(helm, basePath, release)
-}
-
-func (state *HelmState) namespaceAndValuesFlags(helm helmexec.Interface, basePath string, release *ReleaseSpec) ([]string, error) {
-	flags := []string{}
-	if release.Namespace != "" {
-		flags = append(flags, "--namespace", release.Namespace)
-	}
-	for _, value := range release.Values {
-		switch typedValue := value.(type) {
-		case string:
-			var path string
-			if filepath.IsAbs(typedValue) {
-				path = typedValue
-			} else {
-				path = filepath.Join(basePath, typedValue)
-			}
-			if _, err := os.Stat(path); os.IsNotExist(err) {
-				return nil, err
-			}
-
-			yamlBuf, err := RenderTemplateFileToBuffer(path)
-			if err != nil {
-
-				return nil, fmt.Errorf("failed to render [%s], because of %v", path, err)
-			}
-			valfile, err := ioutil.TempFile("", "values")
-			if err != nil {
-				return nil, err
-			}
-			defer valfile.Close()
-			yamlBytes := yamlBuf.Bytes()
-			if _, err := valfile.Write(yamlBytes); err != nil {
-				return nil, fmt.Errorf("failed to write %s: %v", valfile.Name(), err)
-			}
-			state.logger.Debugf("successfully generated the value file at %s. produced:\n%s", path, string(yamlBytes))
-			flags = append(flags, "--values", valfile.Name())
-
-		case map[interface{}]interface{}:
-			valfile, err := ioutil.TempFile("", "values")
-			if err != nil {
-				return nil, err
-			}
-			defer valfile.Close()
-			encoder := yaml.NewEncoder(valfile)
-			defer encoder.Close()
-			if err := encoder.Encode(typedValue); err != nil {
-				return nil, err
-			}
-			release.generatedValues = append(release.generatedValues, valfile.Name())
-			flags = append(flags, "--values", valfile.Name())
-		}
-	}
-	for _, value := range release.Secrets {
-		path := filepath.Join(basePath, value)
-		if _, err := os.Stat(path); os.IsNotExist(err) {
-			return nil, err
-		}
-
-		valfile, err := helm.DecryptSecret(path)
-		if err != nil {
-			return nil, err
-		}
-
-		release.generatedValues = append(release.generatedValues, valfile)
-		flags = append(flags, "--values", valfile)
-	}
-	if len(release.SetValues) > 0 {
-		for _, set := range release.SetValues {
-			if set.Value != "" {
-				flags = append(flags, "--set", fmt.Sprintf("%s=%s", escape(set.Name), escape(set.Value)))
-			} else if set.File != "" {
-				flags = append(flags, "--set-file", fmt.Sprintf("%s=%s", escape(set.Name), set.File))
-			} else if len(set.Values) > 0 {
-				items := make([]string, len(set.Values))
-				for i, raw := range set.Values {
-					items[i] = escape(raw)
-				}
-				v := strings.Join(items, ",")
-				flags = append(flags, "--set", fmt.Sprintf("%s={%s}", escape(set.Name), v))
-			}
-		}
-	}
-
-	/***********
-	 * START 'env' section for backwards compatibility
-	 ***********/
-	// The 'env' section is not really necessary any longer, as 'set' would now provide the same functionality
-	if len(release.EnvValues) > 0 {
-		val := []string{}
-		envValErrs := []string{}
-		for _, set := range release.EnvValues {
-			value, isSet := os.LookupEnv(set.Value)
-			if isSet {
-				val = append(val, fmt.Sprintf("%s=%s", escape(set.Name), escape(value)))
-			} else {
-				errMsg := fmt.Sprintf("\t%s", set.Value)
-				envValErrs = append(envValErrs, errMsg)
-			}
-		}
-		if len(envValErrs) != 0 {
-			joinedEnvVals := strings.Join(envValErrs, "\n")
-			errMsg := fmt.Sprintf("Environment Variables not found. Please make sure they are set and try again:\n%s", joinedEnvVals)
-			return nil, errors.New(errMsg)
-		}
-		flags = append(flags, "--set", strings.Join(val, ","))
-	}
-	/**************
-	 * END 'env' section for backwards compatibility
-	 **************/
-
-	return flags, nil
-}
-
-func escape(value string) string {
-	intermediate := strings.Replace(value, "{", "\\{", -1)
-	intermediate = strings.Replace(intermediate, "}", "\\}", -1)
-	return strings.Replace(intermediate, ",", "\\,", -1)
-}
@@ -0,0 +1 @@
+mysecret: MYSECRET
@@ -1,8 +1,16 @@
+environments:
+  default:
+    values:
+      - environment.values.yaml
+---
 repositories:
  - name: stable
    url: https://kubernetes-charts.storage.googleapis.com/
+  - name: incubator
+    url: https://kubernetes-charts-incubator.storage.googleapis.com

-context: minikube
+helmDefaults:
+  kubeContext: minikube

 releases:

@@ -11,3 +19,9 @@ releases:
    set:
      - name: ingress.enabled
        value: false
+
+  - name: raw
+    chart: incubator/raw
+    values:
+      - mysecret: {{ .Environment.Values.mysecret }}
+      - values.yaml
@@ -47,6 +47,7 @@ set -e
 info "Using namespace: ${test_ns}"
 info "Using Helm version: $(helm version --short --client | grep -o v.*$)"
 ${helm} init --wait --override spec.template.spec.automountServiceAccountToken=true
+${helm} plugin install https://github.com/databus23/helm-diff --version master
 ${kubectl} get namespace ${test_ns} &> /dev/null && warn "Namespace ${test_ns} exists, from a previous test run?"
 $kubectl create namespace ${test_ns} || fail "Could not create namespace ${test_ns}"
 trap "{ $kubectl delete namespace ${test_ns}; }" EXIT # remove namespace whenever we exit this script
@@ -55,14 +56,52 @@ trap "{ $kubectl delete namespace ${test_ns}; }" EXIT # remove namespace wheneve
 # TEST CASES----------------------------------------------------------------------------------------------------------

 test_start "happypath - simple rollout of httpbin chart"
+
+info "Diffing ${dir}/happypath.yaml"
+bash -c "${helmfile} -f ${dir}/happypath.yaml diff --detailed-exitcode; code="'$?'"; [ "'${code}'" -eq 2 ]" || fail "unexpected exit code returned by helmfile diff"
+
+info "Diffing ${dir}/happypath.yaml without color"
+bash -c "${helmfile} -f ${dir}/happypath.yaml --no-color diff --detailed-exitcode; code="'$?'"; [ "'${code}'" -eq 2 ]" || fail "unexpected exit code returned by helmfile diff"
+
+info "Diffing ${dir}/happypath.yaml with limited context"
+bash -c "${helmfile} -f ${dir}/happypath.yaml diff --context 3 --detailed-exitcode; code="'$?'"; [ "'${code}'" -eq 2 ]" || fail "unexpected exit code returned by helmfile diff"
+
+info "Templating ${dir}/happypath.yaml"
+${helmfile} -f ${dir}/happypath.yaml template
+code=$?
+[ ${code} -eq 0 ] || fail "unexpected exit code returned by helmfile template: ${code}"
+
 info "Syncing ${dir}/happypath.yaml"
 ${helmfile} -f ${dir}/happypath.yaml sync
 wait_deploy_ready httpbin-httpbin
 retry 5 "curl --fail $(minikube service --url --namespace=${test_ns} httpbin-httpbin)/status/200"
 [ ${retry_result} -eq 0 ] || fail "httpbin failed to return 200 OK"
+
+info "Applying ${dir}/happypath.yaml"
+${helmfile} -f ${dir}/happypath.yaml apply
+code=$?
+[ ${code} -eq 0 ] || fail "unexpected exit code returned by helmfile apply: ${code}"
+
+info "Locking dependencies"
+${helmfile} -f ${dir}/happypath.yaml deps
+code=$?
+[ ${code} -eq 0 ] || fail "unexpected exit code returned by helmfile deps: ${code}"
+
+info "Applying ${dir}/happypath.yaml with locked dependencies"
+${helmfile} -f ${dir}/happypath.yaml apply
+code=$?
+[ ${code} -eq 0 ] || fail "unexpected exit code returned by helmfile apply: ${code}"
+
 info "Deleting release"
 ${helmfile} -f ${dir}/happypath.yaml delete
 ${helm} status --namespace=${test_ns} httpbin &> /dev/null && fail "release should not exist anymore after a delete"
+
+info "Ensuring \"helmfile delete\" doesn't fail when no releases installed"
+${helmfile} -f ${dir}/happypath.yaml delete || fail "\"helmfile delete\" shouldn't fail when there are no installed releases"
+
+info "Ensuring \"helmfile template\" output does contain only YAML docs"
+(${helmfile} -f ${dir}/happypath.yaml template | kubectl apply -f -) || fail "\"helmfile template | kubectl apply -f -\" shouldn't fail"
+
 test_pass "happypath"


@@ -0,0 +1,9 @@
+resources: []
+templates:
+  - |
+    apiVersion: v1
+    kind: Secret
+    metadata:
+      name: common-secret
+    stringData:
+      mykey: {{ .Values.mysecret }}
@@ -1,27 +0,0 @@
-language: go
-
-go:
-  - 1.6.x
-  - 1.7.x
-  - 1.8.x
-  - 1.9.x
-  - 1.10.x
-  - tip
-
-# Setting sudo access to false will let Travis CI use containers rather than
-# VMs to run the tests. For more details see:
-# - http://docs.travis-ci.com/user/workers/container-based-infrastructure/
-# - http://docs.travis-ci.com/user/workers/standard-infrastructure/
-sudo: false
-
-script:
-  - make setup
-  - make test
-
-notifications:
-  webhooks:
-    urls:
-      - https://webhooks.gitter.im/e/06e3328629952dabe3e0
-    on_success: change  # options: [always|never|change] default: always
-    on_failure: always  # options: [always|never|change] default: always
-    on_start: never     # options: [always|never|change] default: always
@@ -1,77 +0,0 @@
-# 1.4.1 (2018-04-02)
-
-## Fixed
- Fixed #64: Fix pre-release precedence issue (thanks @uudashr)
-
-# 1.4.0 (2017-10-04)
-
-## Changed
- #61: Update NewVersion to parse ints with a 64bit int size (thanks @zknill)
-
-# 1.3.1 (2017-07-10)
-
-## Fixed
- Fixed #57: number comparisons in prerelease sometimes inaccurate
-
-# 1.3.0 (2017-05-02)
-
-## Added
- #45: Added json (un)marshaling support (thanks @mh-cbon)
- Stability marker. See https://masterminds.github.io/stability/
-
-## Fixed
- #51: Fix handling of single digit tilde constraint (thanks @dgodd)
-
-## Changed
- #55: The godoc icon moved from png to svg
-
-# 1.2.3 (2017-04-03)
-
-## Fixed
- #46: Fixed 0.x.x and 0.0.x in constraints being treated as *
-
-# Release 1.2.2 (2016-12-13)
-
-## Fixed
- #34: Fixed issue where hyphen range was not working with pre-release parsing.
-
-# Release 1.2.1 (2016-11-28)
-
-## Fixed
- #24: Fixed edge case issue where constraint "> 0" does not handle "0.0.1-alpha"
-  properly.
-
-# Release 1.2.0 (2016-11-04)
-
-## Added
- #20: Added MustParse function for versions (thanks @adamreese)
- #15: Added increment methods on versions (thanks @mh-cbon)
-
-## Fixed
- Issue #21: Per the SemVer spec (section 9) a pre-release is unstable and
-  might not satisfy the intended compatibility. The change here ignores pre-releases
-  on constraint checks (e.g., ~ or ^) when a pre-release is not part of the
-  constraint. For example, `^1.2.3` will ignore pre-releases while
-  `^1.2.3-alpha` will include them.
-
-# Release 1.1.1 (2016-06-30)
-
-## Changed
- Issue #9: Speed up version comparison performance (thanks @sdboyer)
- Issue #8: Added benchmarks (thanks @sdboyer)
- Updated Go Report Card URL to new location
- Updated Readme to add code snippet formatting (thanks @mh-cbon)
- Updating tagging to v[SemVer] structure for compatibility with other tools.
-
-# Release 1.1.0 (2016-03-11)
-
- Issue #2: Implemented validation to provide reasons a versions failed a
-  constraint.
-
-# Release 1.0.1 (2015-12-31)
-
- Fixed #1: * constraint failing on valid versions.
-
-# Release 1.0.0 (2015-10-20)
-
- Initial release
@@ -1,20 +0,0 @@
-The Masterminds
-Copyright (C) 2014-2015, Matt Butcher and Matt Farina
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
@@ -1,36 +0,0 @@
-.PHONY: setup
-setup:
-	go get -u gopkg.in/alecthomas/gometalinter.v1
-	gometalinter.v1 --install
-
-.PHONY: test
-test: validate lint
-	@echo "==> Running tests"
-	go test -v
-
-.PHONY: validate
-validate:
-	@echo "==> Running static validations"
-	@gometalinter.v1 \
-	  --disable-all \
-	  --enable deadcode \
-	  --severity deadcode:error \
-	  --enable gofmt \
-	  --enable gosimple \
-	  --enable ineffassign \
-	  --enable misspell \
-	  --enable vet \
-	  --tests \
-	  --vendor \
-	  --deadline 60s \
-	  ./... || exit_code=1
-
-.PHONY: lint
-lint:
-	@echo "==> Running linters"
-	@gometalinter.v1 \
-	  --disable-all \
-	  --enable golint \
-	  --vendor \
-	  --deadline 60s \
-	  ./... || :
@@ -1,165 +0,0 @@
-# SemVer
-
-The `semver` package provides the ability to work with [Semantic Versions](http://semver.org) in Go. Specifically it provides the ability to:
-
-* Parse semantic versions
-* Sort semantic versions
-* Check if a semantic version fits within a set of constraints
-* Optionally work with a `v` prefix
-
-[![Stability:
-Active](https://masterminds.github.io/stability/active.svg)](https://masterminds.github.io/stability/active.html)
-[![Build Status](https://travis-ci.org/Masterminds/semver.svg)](https://travis-ci.org/Masterminds/semver) [![Build status](https://ci.appveyor.com/api/projects/status/jfk66lib7hb985k8/branch/master?svg=true&passingText=windows%20build%20passing&failingText=windows%20build%20failing)](https://ci.appveyor.com/project/mattfarina/semver/branch/master) [![GoDoc](https://godoc.org/github.com/Masterminds/semver?status.svg)](https://godoc.org/github.com/Masterminds/semver) [![Go Report Card](https://goreportcard.com/badge/github.com/Masterminds/semver)](https://goreportcard.com/report/github.com/Masterminds/semver)
-
-## Parsing Semantic Versions
-
-To parse a semantic version use the `NewVersion` function. For example,
-
-```go
-    v, err := semver.NewVersion("1.2.3-beta.1+build345")
-```
-
-If there is an error the version wasn't parseable. The version object has methods
-to get the parts of the version, compare it to other versions, convert the
-version back into a string, and get the original string. For more details
-please see the [documentation](https://godoc.org/github.com/Masterminds/semver).
-
-## Sorting Semantic Versions
-
-A set of versions can be sorted using the [`sort`](https://golang.org/pkg/sort/)
-package from the standard library. For example,
-
-```go
-    raw := []string{"1.2.3", "1.0", "1.3", "2", "0.4.2",}
-    vs := make([]*semver.Version, len(raw))
-	for i, r := range raw {
-		v, err := semver.NewVersion(r)
-		if err != nil {
-			t.Errorf("Error parsing version: %s", err)
-		}
-
-		vs[i] = v
-	}
-
-	sort.Sort(semver.Collection(vs))
-```
-
-## Checking Version Constraints
-
-Checking a version against version constraints is one of the most featureful
-parts of the package.
-
-```go
-    c, err := semver.NewConstraint(">= 1.2.3")
-    if err != nil {
-        // Handle constraint not being parseable.
-    }
-
-    v, _ := semver.NewVersion("1.3")
-    if err != nil {
-        // Handle version not being parseable.
-    }
-    // Check if the version meets the constraints. The a variable will be true.
-    a := c.Check(v)
-```
-
-## Basic Comparisons
-
-There are two elements to the comparisons. First, a comparison string is a list
-of comma separated and comparisons. These are then separated by || separated or
-comparisons. For example, `">= 1.2, < 3.0.0 || >= 4.2.3"` is looking for a
-comparison that's greater than or equal to 1.2 and less than 3.0.0 or is
-greater than or equal to 4.2.3.
-
-The basic comparisons are:
-
-* `=`: equal (aliased to no operator)
-* `!=`: not equal
-* `>`: greater than
-* `<`: less than
-* `>=`: greater than or equal to
-* `<=`: less than or equal to
-
-_Note, according to the Semantic Version specification pre-releases may not be
-API compliant with their release counterpart. It says,_
-
-> _A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version._
-
-_SemVer comparisons without a pre-release value will skip pre-release versions.
-For example, `>1.2.3` will skip pre-releases when looking at a list of values
-while `>1.2.3-alpha.1` will evaluate pre-releases._
-
-## Hyphen Range Comparisons
-
-There are multiple methods to handle ranges and the first is hyphens ranges.
-These look like:
-
-* `1.2 - 1.4.5` which is equivalent to `>= 1.2, <= 1.4.5`
-* `2.3.4 - 4.5` which is equivalent to `>= 2.3.4, <= 4.5`
-
-## Wildcards In Comparisons
-
-The `x`, `X`, and `*` characters can be used as a wildcard character. This works
-for all comparison operators. When used on the `=` operator it falls
-back to the pack level comparison (see tilde below). For example,
-
-* `1.2.x` is equivalent to `>= 1.2.0, < 1.3.0`
-* `>= 1.2.x` is equivalent to `>= 1.2.0`
-* `<= 2.x` is equivalent to `<= 3`
-* `*` is equivalent to `>= 0.0.0`
-
-## Tilde Range Comparisons (Patch)
-
-The tilde (`~`) comparison operator is for patch level ranges when a minor
-version is specified and major level changes when the minor number is missing.
-For example,
-
-* `~1.2.3` is equivalent to `>= 1.2.3, < 1.3.0`
-* `~1` is equivalent to `>= 1, < 2`
-* `~2.3` is equivalent to `>= 2.3, < 2.4`
-* `~1.2.x` is equivalent to `>= 1.2.0, < 1.3.0`
-* `~1.x` is equivalent to `>= 1, < 2`
-
-## Caret Range Comparisons (Major)
-
-The caret (`^`) comparison operator is for major level changes. This is useful
-when comparisons of API versions as a major change is API breaking. For example,
-
-* `^1.2.3` is equivalent to `>= 1.2.3, < 2.0.0`
-* `^1.2.x` is equivalent to `>= 1.2.0, < 2.0.0`
-* `^2.3` is equivalent to `>= 2.3, < 3`
-* `^2.x` is equivalent to `>= 2.0.0, < 3`
-
-# Validation
-
-In addition to testing a version against a constraint, a version can be validated
-against a constraint. When validation fails a slice of errors containing why a
-version didn't meet the constraint is returned. For example,
-
-```go
-    c, err := semver.NewConstraint("<= 1.2.3, >= 1.4")
-    if err != nil {
-        // Handle constraint not being parseable.
-    }
-
-    v, _ := semver.NewVersion("1.3")
-    if err != nil {
-        // Handle version not being parseable.
-    }
-
-    // Validate a version against a constraint.
-    a, msgs := c.Validate(v)
-    // a is false
-    for _, m := range msgs {
-        fmt.Println(m)
-
-        // Loops over the errors which would read
-        // "1.3 is greater than 1.2.3"
-        // "1.3 is less than 1.4"
-    }
-```
-
-# Contribute
-
-If you find an issue or want to contribute please file an [issue](https://github.com/Masterminds/semver/issues)
-or [create a pull request](https://github.com/Masterminds/semver/pulls).
@@ -1,44 +0,0 @@
-version: build-{build}.{branch}
-
-clone_folder: C:\gopath\src\github.com\Masterminds\semver
-shallow_clone: true
-
-environment:
-  GOPATH: C:\gopath
-
-platform:
-  - x64
-
-install:
-  - go version
-  - go env
-  - go get -u gopkg.in/alecthomas/gometalinter.v1
-  - set PATH=%PATH%;%GOPATH%\bin
-  - gometalinter.v1.exe --install
-
-build_script:
-  - go install -v ./...
-
-test_script:
-  - "gometalinter.v1 \
-    --disable-all \
-    --enable deadcode \
-    --severity deadcode:error \
-    --enable gofmt \
-    --enable gosimple \
-    --enable ineffassign \
-    --enable misspell \
-    --enable vet \
-    --tests \
-    --vendor \
-    --deadline 60s \
-    ./... || exit_code=1"
-  - "gometalinter.v1 \
-    --disable-all \
-    --enable golint \
-    --vendor \
-    --deadline 60s \
-    ./... || :"
-  - go test -v
-
-deploy: off
@@ -1,24 +0,0 @@
-package semver
-
-// Collection is a collection of Version instances and implements the sort
-// interface. See the sort package for more details.
-// https://golang.org/pkg/sort/
-type Collection []*Version
-
-// Len returns the length of a collection. The number of Version instances
-// on the slice.
-func (c Collection) Len() int {
-	return len(c)
-}
-
-// Less is needed for the sort interface to compare two Version objects on the
-// slice. If checks if one is less than the other.
-func (c Collection) Less(i, j int) bool {
-	return c[i].LessThan(c[j])
-}
-
-// Swap is needed for the sort interface to replace the Version objects
-// at two different positions in the slice.
-func (c Collection) Swap(i, j int) {
-	c[i], c[j] = c[j], c[i]
-}
@@ -1,426 +0,0 @@
-package semver
-
-import (
-	"errors"
-	"fmt"
-	"regexp"
-	"strings"
-)
-
-// Constraints is one or more constraint that a semantic version can be
-// checked against.
-type Constraints struct {
-	constraints [][]*constraint
-}
-
-// NewConstraint returns a Constraints instance that a Version instance can
-// be checked against. If there is a parse error it will be returned.
-func NewConstraint(c string) (*Constraints, error) {
-
-	// Rewrite - ranges into a comparison operation.
-	c = rewriteRange(c)
-
-	ors := strings.Split(c, "||")
-	or := make([][]*constraint, len(ors))
-	for k, v := range ors {
-		cs := strings.Split(v, ",")
-		result := make([]*constraint, len(cs))
-		for i, s := range cs {
-			pc, err := parseConstraint(s)
-			if err != nil {
-				return nil, err
-			}
-
-			result[i] = pc
-		}
-		or[k] = result
-	}
-
-	o := &Constraints{constraints: or}
-	return o, nil
-}
-
-// Check tests if a version satisfies the constraints.
-func (cs Constraints) Check(v *Version) bool {
-	// loop over the ORs and check the inner ANDs
-	for _, o := range cs.constraints {
-		joy := true
-		for _, c := range o {
-			if !c.check(v) {
-				joy = false
-				break
-			}
-		}
-
-		if joy {
-			return true
-		}
-	}
-
-	return false
-}
-
-// Validate checks if a version satisfies a constraint. If not a slice of
-// reasons for the failure are returned in addition to a bool.
-func (cs Constraints) Validate(v *Version) (bool, []error) {
-	// loop over the ORs and check the inner ANDs
-	var e []error
-	for _, o := range cs.constraints {
-		joy := true
-		for _, c := range o {
-			if !c.check(v) {
-				em := fmt.Errorf(c.msg, v, c.orig)
-				e = append(e, em)
-				joy = false
-			}
-		}
-
-		if joy {
-			return true, []error{}
-		}
-	}
-
-	return false, e
-}
-
-var constraintOps map[string]cfunc
-var constraintMsg map[string]string
-var constraintRegex *regexp.Regexp
-
-func init() {
-	constraintOps = map[string]cfunc{
-		"":   constraintTildeOrEqual,
-		"=":  constraintTildeOrEqual,
-		"!=": constraintNotEqual,
-		">":  constraintGreaterThan,
-		"<":  constraintLessThan,
-		">=": constraintGreaterThanEqual,
-		"=>": constraintGreaterThanEqual,
-		"<=": constraintLessThanEqual,
-		"=<": constraintLessThanEqual,
-		"~":  constraintTilde,
-		"~>": constraintTilde,
-		"^":  constraintCaret,
-	}
-
-	constraintMsg = map[string]string{
-		"":   "%s is not equal to %s",
-		"=":  "%s is not equal to %s",
-		"!=": "%s is equal to %s",
-		">":  "%s is less than or equal to %s",
-		"<":  "%s is greater than or equal to %s",
-		">=": "%s is less than %s",
-		"=>": "%s is less than %s",
-		"<=": "%s is greater than %s",
-		"=<": "%s is greater than %s",
-		"~":  "%s does not have same major and minor version as %s",
-		"~>": "%s does not have same major and minor version as %s",
-		"^":  "%s does not have same major version as %s",
-	}
-
-	ops := make([]string, 0, len(constraintOps))
-	for k := range constraintOps {
-		ops = append(ops, regexp.QuoteMeta(k))
-	}
-
-	constraintRegex = regexp.MustCompile(fmt.Sprintf(
-		`^\s*(%s)\s*(%s)\s*$`,
-		strings.Join(ops, "|"),
-		cvRegex))
-
-	constraintRangeRegex = regexp.MustCompile(fmt.Sprintf(
-		`\s*(%s)\s+-\s+(%s)\s*`,
-		cvRegex, cvRegex))
-}
-
-// An individual constraint
-type constraint struct {
-	// The callback function for the restraint. It performs the logic for
-	// the constraint.
-	function cfunc
-
-	msg string
-
-	// The version used in the constraint check. For example, if a constraint
-	// is '<= 2.0.0' the con a version instance representing 2.0.0.
-	con *Version
-
-	// The original parsed version (e.g., 4.x from != 4.x)
-	orig string
-
-	// When an x is used as part of the version (e.g., 1.x)
-	minorDirty bool
-	dirty      bool
-	patchDirty bool
-}
-
-// Check if a version meets the constraint
-func (c *constraint) check(v *Version) bool {
-	return c.function(v, c)
-}
-
-type cfunc func(v *Version, c *constraint) bool
-
-func parseConstraint(c string) (*constraint, error) {
-	m := constraintRegex.FindStringSubmatch(c)
-	if m == nil {
-		return nil, fmt.Errorf("improper constraint: %s", c)
-	}
-
-	ver := m[2]
-	orig := ver
-	minorDirty := false
-	patchDirty := false
-	dirty := false
-	if isX(m[3]) {
-		ver = "0.0.0"
-		dirty = true
-	} else if isX(strings.TrimPrefix(m[4], ".")) || m[4] == "" {
-		minorDirty = true
-		dirty = true
-		ver = fmt.Sprintf("%s.0.0%s", m[3], m[6])
-	} else if isX(strings.TrimPrefix(m[5], ".")) {
-		dirty = true
-		patchDirty = true
-		ver = fmt.Sprintf("%s%s.0%s", m[3], m[4], m[6])
-	}
-
-	con, err := NewVersion(ver)
-	if err != nil {
-
-		// The constraintRegex should catch any regex parsing errors. So,
-		// we should never get here.
-		return nil, errors.New("constraint Parser Error")
-	}
-
-	cs := &constraint{
-		function:   constraintOps[m[1]],
-		msg:        constraintMsg[m[1]],
-		con:        con,
-		orig:       orig,
-		minorDirty: minorDirty,
-		patchDirty: patchDirty,
-		dirty:      dirty,
-	}
-	return cs, nil
-}
-
-// Constraint functions
-func constraintNotEqual(v *Version, c *constraint) bool {
-	if c.dirty {
-
-		// If there is a pre-release on the version but the constraint isn't looking
-		// for them assume that pre-releases are not compatible. See issue 21 for
-		// more details.
-		if v.Prerelease() != "" && c.con.Prerelease() == "" {
-			return false
-		}
-
-		if c.con.Major() != v.Major() {
-			return true
-		}
-		if c.con.Minor() != v.Minor() && !c.minorDirty {
-			return true
-		} else if c.minorDirty {
-			return false
-		}
-
-		return false
-	}
-
-	return !v.Equal(c.con)
-}
-
-func constraintGreaterThan(v *Version, c *constraint) bool {
-
-	// An edge case the constraint is 0.0.0 and the version is 0.0.0-someprerelease
-	// exists. This that case.
-	if !isNonZero(c.con) && isNonZero(v) {
-		return true
-	}
-
-	// If there is a pre-release on the version but the constraint isn't looking
-	// for them assume that pre-releases are not compatible. See issue 21 for
-	// more details.
-	if v.Prerelease() != "" && c.con.Prerelease() == "" {
-		return false
-	}
-
-	return v.Compare(c.con) == 1
-}
-
-func constraintLessThan(v *Version, c *constraint) bool {
-	// If there is a pre-release on the version but the constraint isn't looking
-	// for them assume that pre-releases are not compatible. See issue 21 for
-	// more details.
-	if v.Prerelease() != "" && c.con.Prerelease() == "" {
-		return false
-	}
-
-	if !c.dirty {
-		return v.Compare(c.con) < 0
-	}
-
-	if v.Major() > c.con.Major() {
-		return false
-	} else if v.Minor() > c.con.Minor() && !c.minorDirty {
-		return false
-	}
-
-	return true
-}
-
-func constraintGreaterThanEqual(v *Version, c *constraint) bool {
-	// An edge case the constraint is 0.0.0 and the version is 0.0.0-someprerelease
-	// exists. This that case.
-	if !isNonZero(c.con) && isNonZero(v) {
-		return true
-	}
-
-	// If there is a pre-release on the version but the constraint isn't looking
-	// for them assume that pre-releases are not compatible. See issue 21 for
-	// more details.
-	if v.Prerelease() != "" && c.con.Prerelease() == "" {
-		return false
-	}
-
-	return v.Compare(c.con) >= 0
-}
-
-func constraintLessThanEqual(v *Version, c *constraint) bool {
-	// If there is a pre-release on the version but the constraint isn't looking
-	// for them assume that pre-releases are not compatible. See issue 21 for
-	// more details.
-	if v.Prerelease() != "" && c.con.Prerelease() == "" {
-		return false
-	}
-
-	if !c.dirty {
-		return v.Compare(c.con) <= 0
-	}
-
-	if v.Major() > c.con.Major() {
-		return false
-	} else if v.Minor() > c.con.Minor() && !c.minorDirty {
-		return false
-	}
-
-	return true
-}
-
-// ~*, ~>* --> >= 0.0.0 (any)
-// ~2, ~2.x, ~2.x.x, ~>2, ~>2.x ~>2.x.x --> >=2.0.0, <3.0.0
-// ~2.0, ~2.0.x, ~>2.0, ~>2.0.x --> >=2.0.0, <2.1.0
-// ~1.2, ~1.2.x, ~>1.2, ~>1.2.x --> >=1.2.0, <1.3.0
-// ~1.2.3, ~>1.2.3 --> >=1.2.3, <1.3.0
-// ~1.2.0, ~>1.2.0 --> >=1.2.0, <1.3.0
-func constraintTilde(v *Version, c *constraint) bool {
-	// If there is a pre-release on the version but the constraint isn't looking
-	// for them assume that pre-releases are not compatible. See issue 21 for
-	// more details.
-	if v.Prerelease() != "" && c.con.Prerelease() == "" {
-		return false
-	}
-
-	if v.LessThan(c.con) {
-		return false
-	}
-
-	// ~0.0.0 is a special case where all constraints are accepted. It's
-	// equivalent to >= 0.0.0.
-	if c.con.Major() == 0 && c.con.Minor() == 0 && c.con.Patch() == 0 &&
-		!c.minorDirty && !c.patchDirty {
-		return true
-	}
-
-	if v.Major() != c.con.Major() {
-		return false
-	}
-
-	if v.Minor() != c.con.Minor() && !c.minorDirty {
-		return false
-	}
-
-	return true
-}
-
-// When there is a .x (dirty) status it automatically opts in to ~. Otherwise
-// it's a straight =
-func constraintTildeOrEqual(v *Version, c *constraint) bool {
-	// If there is a pre-release on the version but the constraint isn't looking
-	// for them assume that pre-releases are not compatible. See issue 21 for
-	// more details.
-	if v.Prerelease() != "" && c.con.Prerelease() == "" {
-		return false
-	}
-
-	if c.dirty {
-		c.msg = constraintMsg["~"]
-		return constraintTilde(v, c)
-	}
-
-	return v.Equal(c.con)
-}
-
-// ^* --> (any)
-// ^2, ^2.x, ^2.x.x --> >=2.0.0, <3.0.0
-// ^2.0, ^2.0.x --> >=2.0.0, <3.0.0
-// ^1.2, ^1.2.x --> >=1.2.0, <2.0.0
-// ^1.2.3 --> >=1.2.3, <2.0.0
-// ^1.2.0 --> >=1.2.0, <2.0.0
-func constraintCaret(v *Version, c *constraint) bool {
-	// If there is a pre-release on the version but the constraint isn't looking
-	// for them assume that pre-releases are not compatible. See issue 21 for
-	// more details.
-	if v.Prerelease() != "" && c.con.Prerelease() == "" {
-		return false
-	}
-
-	if v.LessThan(c.con) {
-		return false
-	}
-
-	if v.Major() != c.con.Major() {
-		return false
-	}
-
-	return true
-}
-
-var constraintRangeRegex *regexp.Regexp
-
-const cvRegex string = `v?([0-9|x|X|\*]+)(\.[0-9|x|X|\*]+)?(\.[0-9|x|X|\*]+)?` +
-	`(-([0-9A-Za-z\-]+(\.[0-9A-Za-z\-]+)*))?` +
-	`(\+([0-9A-Za-z\-]+(\.[0-9A-Za-z\-]+)*))?`
-
-func isX(x string) bool {
-	switch x {
-	case "x", "*", "X":
-		return true
-	default:
-		return false
-	}
-}
-
-func rewriteRange(i string) string {
-	m := constraintRangeRegex.FindAllStringSubmatch(i, -1)
-	if m == nil {
-		return i
-	}
-	o := i
-	for _, v := range m {
-		t := fmt.Sprintf(">= %s, <= %s", v[1], v[11])
-		o = strings.Replace(o, v[0], t, 1)
-	}
-
-	return o
-}
-
-// Detect if a version is not zero (0.0.0)
-func isNonZero(v *Version) bool {
-	if v.Major() != 0 || v.Minor() != 0 || v.Patch() != 0 || v.Prerelease() != "" {
-		return true
-	}
-
-	return false
-}
@@ -1,115 +0,0 @@
-/*
-Package semver provides the ability to work with Semantic Versions (http://semver.org) in Go.
-
-Specifically it provides the ability to:
-
-    * Parse semantic versions
-    * Sort semantic versions
-    * Check if a semantic version fits within a set of constraints
-    * Optionally work with a `v` prefix
-
-Parsing Semantic Versions
-
-To parse a semantic version use the `NewVersion` function. For example,
-
-    v, err := semver.NewVersion("1.2.3-beta.1+build345")
-
-If there is an error the version wasn't parseable. The version object has methods
-to get the parts of the version, compare it to other versions, convert the
-version back into a string, and get the original string. For more details
-please see the documentation at https://godoc.org/github.com/Masterminds/semver.
-
-Sorting Semantic Versions
-
-A set of versions can be sorted using the `sort` package from the standard library.
-For example,
-
-    raw := []string{"1.2.3", "1.0", "1.3", "2", "0.4.2",}
-    vs := make([]*semver.Version, len(raw))
-	for i, r := range raw {
-		v, err := semver.NewVersion(r)
-		if err != nil {
-			t.Errorf("Error parsing version: %s", err)
-		}
-
-		vs[i] = v
-	}
-
-	sort.Sort(semver.Collection(vs))
-
-Checking Version Constraints
-
-Checking a version against version constraints is one of the most featureful
-parts of the package.
-
-    c, err := semver.NewConstraint(">= 1.2.3")
-    if err != nil {
-        // Handle constraint not being parseable.
-    }
-
-    v, _ := semver.NewVersion("1.3")
-    if err != nil {
-        // Handle version not being parseable.
-    }
-    // Check if the version meets the constraints. The a variable will be true.
-    a := c.Check(v)
-
-Basic Comparisons
-
-There are two elements to the comparisons. First, a comparison string is a list
-of comma separated and comparisons. These are then separated by || separated or
-comparisons. For example, `">= 1.2, < 3.0.0 || >= 4.2.3"` is looking for a
-comparison that's greater than or equal to 1.2 and less than 3.0.0 or is
-greater than or equal to 4.2.3.
-
-The basic comparisons are:
-
-    * `=`: equal (aliased to no operator)
-    * `!=`: not equal
-    * `>`: greater than
-    * `<`: less than
-    * `>=`: greater than or equal to
-    * `<=`: less than or equal to
-
-Hyphen Range Comparisons
-
-There are multiple methods to handle ranges and the first is hyphens ranges.
-These look like:
-
-    * `1.2 - 1.4.5` which is equivalent to `>= 1.2, <= 1.4.5`
-    * `2.3.4 - 4.5` which is equivalent to `>= 2.3.4, <= 4.5`
-
-Wildcards In Comparisons
-
-The `x`, `X`, and `*` characters can be used as a wildcard character. This works
-for all comparison operators. When used on the `=` operator it falls
-back to the pack level comparison (see tilde below). For example,
-
-    * `1.2.x` is equivalent to `>= 1.2.0, < 1.3.0`
-    * `>= 1.2.x` is equivalent to `>= 1.2.0`
-    * `<= 2.x` is equivalent to `<= 3`
-    * `*` is equivalent to `>= 0.0.0`
-
-Tilde Range Comparisons (Patch)
-
-The tilde (`~`) comparison operator is for patch level ranges when a minor
-version is specified and major level changes when the minor number is missing.
-For example,
-
-    * `~1.2.3` is equivalent to `>= 1.2.3, < 1.3.0`
-    * `~1` is equivalent to `>= 1, < 2`
-    * `~2.3` is equivalent to `>= 2.3, < 2.4`
-    * `~1.2.x` is equivalent to `>= 1.2.0, < 1.3.0`
-    * `~1.x` is equivalent to `>= 1, < 2`
-
-Caret Range Comparisons (Major)
-
-The caret (`^`) comparison operator is for major level changes. This is useful
-when comparisons of API versions as a major change is API breaking. For example,
-
-    * `^1.2.3` is equivalent to `>= 1.2.3, < 2.0.0`
-    * `^1.2.x` is equivalent to `>= 1.2.0, < 2.0.0`
-    * `^2.3` is equivalent to `>= 2.3, < 3`
-    * `^2.x` is equivalent to `>= 2.0.0, < 3`
-*/
-package semver
@@ -1,421 +0,0 @@
-package semver
-
-import (
-	"bytes"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"regexp"
-	"strconv"
-	"strings"
-)
-
-// The compiled version of the regex created at init() is cached here so it
-// only needs to be created once.
-var versionRegex *regexp.Regexp
-var validPrereleaseRegex *regexp.Regexp
-
-var (
-	// ErrInvalidSemVer is returned a version is found to be invalid when
-	// being parsed.
-	ErrInvalidSemVer = errors.New("Invalid Semantic Version")
-
-	// ErrInvalidMetadata is returned when the metadata is an invalid format
-	ErrInvalidMetadata = errors.New("Invalid Metadata string")
-
-	// ErrInvalidPrerelease is returned when the pre-release is an invalid format
-	ErrInvalidPrerelease = errors.New("Invalid Prerelease string")
-)
-
-// SemVerRegex is the regular expression used to parse a semantic version.
-const SemVerRegex string = `v?([0-9]+)(\.[0-9]+)?(\.[0-9]+)?` +
-	`(-([0-9A-Za-z\-]+(\.[0-9A-Za-z\-]+)*))?` +
-	`(\+([0-9A-Za-z\-]+(\.[0-9A-Za-z\-]+)*))?`
-
-// ValidPrerelease is the regular expression which validates
-// both prerelease and metadata values.
-const ValidPrerelease string = `^([0-9A-Za-z\-]+(\.[0-9A-Za-z\-]+)*)`
-
-// Version represents a single semantic version.
-type Version struct {
-	major, minor, patch int64
-	pre                 string
-	metadata            string
-	original            string
-}
-
-func init() {
-	versionRegex = regexp.MustCompile("^" + SemVerRegex + "$")
-	validPrereleaseRegex = regexp.MustCompile(ValidPrerelease)
-}
-
-// NewVersion parses a given version and returns an instance of Version or
-// an error if unable to parse the version.
-func NewVersion(v string) (*Version, error) {
-	m := versionRegex.FindStringSubmatch(v)
-	if m == nil {
-		return nil, ErrInvalidSemVer
-	}
-
-	sv := &Version{
-		metadata: m[8],
-		pre:      m[5],
-		original: v,
-	}
-
-	var temp int64
-	temp, err := strconv.ParseInt(m[1], 10, 64)
-	if err != nil {
-		return nil, fmt.Errorf("Error parsing version segment: %s", err)
-	}
-	sv.major = temp
-
-	if m[2] != "" {
-		temp, err = strconv.ParseInt(strings.TrimPrefix(m[2], "."), 10, 64)
-		if err != nil {
-			return nil, fmt.Errorf("Error parsing version segment: %s", err)
-		}
-		sv.minor = temp
-	} else {
-		sv.minor = 0
-	}
-
-	if m[3] != "" {
-		temp, err = strconv.ParseInt(strings.TrimPrefix(m[3], "."), 10, 64)
-		if err != nil {
-			return nil, fmt.Errorf("Error parsing version segment: %s", err)
-		}
-		sv.patch = temp
-	} else {
-		sv.patch = 0
-	}
-
-	return sv, nil
-}
-
-// MustParse parses a given version and panics on error.
-func MustParse(v string) *Version {
-	sv, err := NewVersion(v)
-	if err != nil {
-		panic(err)
-	}
-	return sv
-}
-
-// String converts a Version object to a string.
-// Note, if the original version contained a leading v this version will not.
-// See the Original() method to retrieve the original value. Semantic Versions
-// don't contain a leading v per the spec. Instead it's optional on
-// impelementation.
-func (v *Version) String() string {
-	var buf bytes.Buffer
-
-	fmt.Fprintf(&buf, "%d.%d.%d", v.major, v.minor, v.patch)
-	if v.pre != "" {
-		fmt.Fprintf(&buf, "-%s", v.pre)
-	}
-	if v.metadata != "" {
-		fmt.Fprintf(&buf, "+%s", v.metadata)
-	}
-
-	return buf.String()
-}
-
-// Original returns the original value passed in to be parsed.
-func (v *Version) Original() string {
-	return v.original
-}
-
-// Major returns the major version.
-func (v *Version) Major() int64 {
-	return v.major
-}
-
-// Minor returns the minor version.
-func (v *Version) Minor() int64 {
-	return v.minor
-}
-
-// Patch returns the patch version.
-func (v *Version) Patch() int64 {
-	return v.patch
-}
-
-// Prerelease returns the pre-release version.
-func (v *Version) Prerelease() string {
-	return v.pre
-}
-
-// Metadata returns the metadata on the version.
-func (v *Version) Metadata() string {
-	return v.metadata
-}
-
-// originalVPrefix returns the original 'v' prefix if any.
-func (v *Version) originalVPrefix() string {
-
-	// Note, only lowercase v is supported as a prefix by the parser.
-	if v.original != "" && v.original[:1] == "v" {
-		return v.original[:1]
-	}
-	return ""
-}
-
-// IncPatch produces the next patch version.
-// If the current version does not have prerelease/metadata information,
-// it unsets metadata and prerelease values, increments patch number.
-// If the current version has any of prerelease or metadata information,
-// it unsets both values and keeps curent patch value
-func (v Version) IncPatch() Version {
-	vNext := v
-	// according to http://semver.org/#spec-item-9
-	// Pre-release versions have a lower precedence than the associated normal version.
-	// according to http://semver.org/#spec-item-10
-	// Build metadata SHOULD be ignored when determining version precedence.
-	if v.pre != "" {
-		vNext.metadata = ""
-		vNext.pre = ""
-	} else {
-		vNext.metadata = ""
-		vNext.pre = ""
-		vNext.patch = v.patch + 1
-	}
-	vNext.original = v.originalVPrefix() + "" + vNext.String()
-	return vNext
-}
-
-// IncMinor produces the next minor version.
-// Sets patch to 0.
-// Increments minor number.
-// Unsets metadata.
-// Unsets prerelease status.
-func (v Version) IncMinor() Version {
-	vNext := v
-	vNext.metadata = ""
-	vNext.pre = ""
-	vNext.patch = 0
-	vNext.minor = v.minor + 1
-	vNext.original = v.originalVPrefix() + "" + vNext.String()
-	return vNext
-}
-
-// IncMajor produces the next major version.
-// Sets patch to 0.
-// Sets minor to 0.
-// Increments major number.
-// Unsets metadata.
-// Unsets prerelease status.
-func (v Version) IncMajor() Version {
-	vNext := v
-	vNext.metadata = ""
-	vNext.pre = ""
-	vNext.patch = 0
-	vNext.minor = 0
-	vNext.major = v.major + 1
-	vNext.original = v.originalVPrefix() + "" + vNext.String()
-	return vNext
-}
-
-// SetPrerelease defines the prerelease value.
-// Value must not include the required 'hypen' prefix.
-func (v Version) SetPrerelease(prerelease string) (Version, error) {
-	vNext := v
-	if len(prerelease) > 0 && !validPrereleaseRegex.MatchString(prerelease) {
-		return vNext, ErrInvalidPrerelease
-	}
-	vNext.pre = prerelease
-	vNext.original = v.originalVPrefix() + "" + vNext.String()
-	return vNext, nil
-}
-
-// SetMetadata defines metadata value.
-// Value must not include the required 'plus' prefix.
-func (v Version) SetMetadata(metadata string) (Version, error) {
-	vNext := v
-	if len(metadata) > 0 && !validPrereleaseRegex.MatchString(metadata) {
-		return vNext, ErrInvalidMetadata
-	}
-	vNext.metadata = metadata
-	vNext.original = v.originalVPrefix() + "" + vNext.String()
-	return vNext, nil
-}
-
-// LessThan tests if one version is less than another one.
-func (v *Version) LessThan(o *Version) bool {
-	return v.Compare(o) < 0
-}
-
-// GreaterThan tests if one version is greater than another one.
-func (v *Version) GreaterThan(o *Version) bool {
-	return v.Compare(o) > 0
-}
-
-// Equal tests if two versions are equal to each other.
-// Note, versions can be equal with different metadata since metadata
-// is not considered part of the comparable version.
-func (v *Version) Equal(o *Version) bool {
-	return v.Compare(o) == 0
-}
-
-// Compare compares this version to another one. It returns -1, 0, or 1 if
-// the version smaller, equal, or larger than the other version.
-//
-// Versions are compared by X.Y.Z. Build metadata is ignored. Prerelease is
-// lower than the version without a prerelease.
-func (v *Version) Compare(o *Version) int {
-	// Compare the major, minor, and patch version for differences. If a
-	// difference is found return the comparison.
-	if d := compareSegment(v.Major(), o.Major()); d != 0 {
-		return d
-	}
-	if d := compareSegment(v.Minor(), o.Minor()); d != 0 {
-		return d
-	}
-	if d := compareSegment(v.Patch(), o.Patch()); d != 0 {
-		return d
-	}
-
-	// At this point the major, minor, and patch versions are the same.
-	ps := v.pre
-	po := o.Prerelease()
-
-	if ps == "" && po == "" {
-		return 0
-	}
-	if ps == "" {
-		return 1
-	}
-	if po == "" {
-		return -1
-	}
-
-	return comparePrerelease(ps, po)
-}
-
-// UnmarshalJSON implements JSON.Unmarshaler interface.
-func (v *Version) UnmarshalJSON(b []byte) error {
-	var s string
-	if err := json.Unmarshal(b, &s); err != nil {
-		return err
-	}
-	temp, err := NewVersion(s)
-	if err != nil {
-		return err
-	}
-	v.major = temp.major
-	v.minor = temp.minor
-	v.patch = temp.patch
-	v.pre = temp.pre
-	v.metadata = temp.metadata
-	v.original = temp.original
-	temp = nil
-	return nil
-}
-
-// MarshalJSON implements JSON.Marshaler interface.
-func (v *Version) MarshalJSON() ([]byte, error) {
-	return json.Marshal(v.String())
-}
-
-func compareSegment(v, o int64) int {
-	if v < o {
-		return -1
-	}
-	if v > o {
-		return 1
-	}
-
-	return 0
-}
-
-func comparePrerelease(v, o string) int {
-
-	// split the prelease versions by their part. The separator, per the spec,
-	// is a .
-	sparts := strings.Split(v, ".")
-	oparts := strings.Split(o, ".")
-
-	// Find the longer length of the parts to know how many loop iterations to
-	// go through.
-	slen := len(sparts)
-	olen := len(oparts)
-
-	l := slen
-	if olen > slen {
-		l = olen
-	}
-
-	// Iterate over each part of the prereleases to compare the differences.
-	for i := 0; i < l; i++ {
-		// Since the lentgh of the parts can be different we need to create
-		// a placeholder. This is to avoid out of bounds issues.
-		stemp := ""
-		if i < slen {
-			stemp = sparts[i]
-		}
-
-		otemp := ""
-		if i < olen {
-			otemp = oparts[i]
-		}
-
-		d := comparePrePart(stemp, otemp)
-		if d != 0 {
-			return d
-		}
-	}
-
-	// Reaching here means two versions are of equal value but have different
-	// metadata (the part following a +). They are not identical in string form
-	// but the version comparison finds them to be equal.
-	return 0
-}
-
-func comparePrePart(s, o string) int {
-	// Fastpath if they are equal
-	if s == o {
-		return 0
-	}
-
-	// When s or o are empty we can use the other in an attempt to determine
-	// the response.
-	if s == "" {
-		if o != "" {
-			return -1
-		}
-		return 1
-	}
-
-	if o == "" {
-		if s != "" {
-			return 1
-		}
-		return -1
-	}
-
-	// When comparing strings "99" is greater than "103". To handle
-	// cases like this we need to detect numbers and compare them.
-
-	oi, n1 := strconv.ParseInt(o, 10, 64)
-	si, n2 := strconv.ParseInt(s, 10, 64)
-
-	// The case where both are strings compare the strings
-	if n1 != nil && n2 != nil {
-		if s > o {
-			return 1
-		}
-		return -1
-	} else if n1 != nil {
-		// o is a string and s is a number
-		return -1
-	} else if n2 != nil {
-		// s is a string and o is a number
-		return 1
-	}
-	// Both are numbers
-	if si > oi {
-		return 1
-	}
-	return -1
-
-}
@@ -1,2 +0,0 @@
-vendor/
-/.glide
@@ -1,23 +0,0 @@
-language: go
-
-go:
-  - 1.9.x
-  - 1.10.x
-  - tip
-
-# Setting sudo access to false will let Travis CI use containers rather than
-# VMs to run the tests. For more details see:
-# - http://docs.travis-ci.com/user/workers/container-based-infrastructure/
-# - http://docs.travis-ci.com/user/workers/standard-infrastructure/
-sudo: false
-
-script:
-  - make setup test
-
-notifications:
-  webhooks:
-    urls:
-      - https://webhooks.gitter.im/e/06e3328629952dabe3e0
-    on_success: change  # options: [always|never|change] default: always
-    on_failure: always  # options: [always|never|change] default: always
-    on_start: never     # options: [always|never|change] default: always
@@ -1,153 +0,0 @@
-# Changelog
-
-## Release 2.15.0 (2018-04-02)
-
-### Added
-
- #68 and #69: Add json helpers to docs (thanks @arunvelsriram)
- #66: Add ternary function (thanks @binoculars)
- #67: Allow keys function to take multiple dicts (thanks @binoculars)
- #89: Added sha1sum to crypto function (thanks @benkeil)
- #81: Allow customizing Root CA that used by genSignedCert (thanks @chenzhiwei)
- #92: Add travis testing for go 1.10
- #93: Adding appveyor config for windows testing
-
-### Changed
-
- #90: Updating to more recent dependencies
- #73: replace satori/go.uuid with google/uuid (thanks @petterw)
-
-### Fixed
-
- #76: Fixed documentation typos (thanks @Thiht)
- Fixed rounding issue on the `ago` function. Note, the removes support for Go 1.8 and older
-
-## Release 2.14.1 (2017-12-01)
-
-### Fixed
-
- #60: Fix typo in function name documentation (thanks @neil-ca-moore)
- #61: Removing line with {{ due to blocking github pages genertion
- #64: Update the list functions to handle int, string, and other slices for compatibility
-
-## Release 2.14.0 (2017-10-06)
-
-This new version of Sprig adds a set of functions for generating and working with SSL certificates.
-
- `genCA` generates an SSL Certificate Authority
- `genSelfSignedCert` generates an SSL self-signed certificate
- `genSignedCert` generates an SSL certificate and key based on a given CA
-
-## Release 2.13.0 (2017-09-18)
-
-This release adds new functions, including:
-
- `regexMatch`, `regexFindAll`, `regexFind`, `regexReplaceAll`, `regexReplaceAllLiteral`, and `regexSplit` to work with regular expressions
- `floor`, `ceil`, and `round` math functions
- `toDate` converts a string to a date
- `nindent` is just like `indent` but also prepends a new line
- `ago` returns the time from `time.Now`
-
-### Added
-
- #40: Added basic regex functionality (thanks @alanquillin)
- #41: Added ceil floor and round functions (thanks @alanquillin)
- #48: Added toDate function (thanks @andreynering)
- #50: Added nindent function (thanks @binoculars)
- #46: Added ago function (thanks @slayer)
-
-### Changed
-
- #51: Updated godocs to include new string functions (thanks @curtisallen)
- #49: Added ability to merge multiple dicts (thanks @binoculars)
-
-## Release 2.12.0 (2017-05-17)
-
- `snakecase`, `camelcase`, and `shuffle` are three new string functions
- `fail` allows you to bail out of a template render when conditions are not met
-
-## Release 2.11.0 (2017-05-02)
-
- Added `toJson` and `toPrettyJson`
- Added `merge`
- Refactored documentation
-
-## Release 2.10.0 (2017-03-15)
-
- Added `semver` and `semverCompare` for Semantic Versions
- `list` replaces `tuple`
- Fixed issue with `join`
- Added `first`, `last`, `intial`, `rest`, `prepend`, `append`, `toString`, `toStrings`, `sortAlpha`, `reverse`, `coalesce`, `pluck`, `pick`, `compact`, `keys`, `omit`, `uniq`, `has`, `without`
-
-## Release 2.9.0 (2017-02-23)
-
- Added `splitList` to split a list
- Added crypto functions of `genPrivateKey` and `derivePassword`
-
-## Release 2.8.0 (2016-12-21)
-
- Added access to several path functions (`base`, `dir`, `clean`, `ext`, and `abs`)
- Added functions for _mutating_ dictionaries (`set`, `unset`, `hasKey`)
-
-## Release 2.7.0 (2016-12-01)
-
- Added `sha256sum` to generate a hash of an input
- Added functions to convert a numeric or string to `int`, `int64`, `float64`
-
-## Release 2.6.0 (2016-10-03)
-
- Added a `uuidv4` template function for generating UUIDs inside of a template.
-
-## Release 2.5.0 (2016-08-19)
-
- New `trimSuffix`, `trimPrefix`, `hasSuffix`, and `hasPrefix` functions
- New aliases have been added for a few functions that didn't follow the naming conventions (`trimAll` and `abbrevBoth`)
- `trimall` and `abbrevboth` (notice the case) are deprecated and will be removed in 3.0.0
-
-## Release 2.4.0 (2016-08-16)
-
- Adds two functions: `until` and `untilStep`
-
-## Release 2.3.0 (2016-06-21)
-
- cat: Concatenate strings with whitespace separators.
- replace: Replace parts of a string: `replace " " "-" "Me First"` renders "Me-First"
- plural: Format plurals: `len "foo" | plural "one foo" "many foos"` renders "many foos"
- indent: Indent blocks of text in a way that is sensitive to "\n" characters.
-
-## Release 2.2.0 (2016-04-21)
-
- Added a `genPrivateKey` function (Thanks @bacongobbler)
-
-## Release 2.1.0 (2016-03-30)
-
- `default` now prints the default value when it does not receive a value down the pipeline. It is much safer now to do `{{.Foo | default "bar"}}`.
- Added accessors for "hermetic" functions. These return only functions that, when given the same input, produce the same output.
-
-## Release 2.0.0 (2016-03-29)
-
-Because we switched from `int` to `int64` as the return value for all integer math functions, the library's major version number has been incremented.
-
- `min` complements `max` (formerly `biggest`)
- `empty` indicates that a value is the empty value for its type
- `tuple` creates a tuple inside of a template: `{{$t := tuple "a", "b" "c"}}`
- `dict` creates a dictionary inside of a template `{{$d := dict "key1" "val1" "key2" "val2"}}` 
- Date formatters have been added for HTML dates (as used in `date` input fields)
- Integer math functions can convert from a number of types, including `string` (via `strconv.ParseInt`).
-
-## Release 1.2.0 (2016-02-01)
-
- Added quote and squote
- Added b32enc and b32dec
- add now takes varargs
- biggest now takes varargs
-
-## Release 1.1.0 (2015-12-29)
-
- Added #4: Added contains function. strings.Contains, but with the arguments
-  switched to simplify common pipelines. (thanks krancour)
- Added Travis-CI testing support
-
-## Release 1.0.0 (2015-12-23)
-
- Initial release
@@ -1,20 +0,0 @@
-Sprig
-Copyright (C) 2013 Masterminds
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
@@ -1,13 +0,0 @@
-
-HAS_GLIDE := $(shell command -v glide;)
-
-.PHONY: test
-test:
-	go test -v .
-
-.PHONY: setup
-setup:
-ifndef HAS_GLIDE
-	go get -u github.com/Masterminds/glide
-endif
-	glide install
--- a/Show More
+++ b/Show More