* feat: helmfile as a go library
This removes almost all the dependencies from the helmfile core logic to urfave/cli. `main.go` is now a thin wrapper around the core logic implemented in `pkg/app`.
In order to maintain predictable deployments, as developer I want to generate and use "lock files" for all chart versions retrieved from a helmfile.
This change solves it by (1)enhancing `helmfile deps` to generate a lock file containing all the direct chart dependencies of each helmfile state file and
(2)making other helmfile sub-commands reads the lock file and merge the locked version numbers to the helmfile state file being processed.
The lock file is named after the helmfile state file being locked, so that you can have multiple set of the helmfile state file and the lock file pairs in a directory.
When `helmfile deps` are not explicitly run before commands like `sync`, all the helmfile behavior should remain as before.
Let's say you have `helmfile.1.yaml`:
```
repositories:
- name: stable
url: https://kubernetes-charts.storage.googleapis.com
releases:
- name: envoy
chart: stable/envoy
- name: envoy2
chart: stable/envoy
```
`helmfile deps` generates `helmfile.1.lock` that looks like:
```
dependencies:
- name: envoy
repository: https://kubernetes-charts.storage.googleapis.com
version: 1.5.0
digest: sha256:e43b05c8528ea8ef1560f4980a519719ad2a634658abde0a98daefdb83a104e9
generated: 2019-05-14T16:45:37.78205+09:00
```
Under the hood, `helmfile deps` creates a temporary local helm chart with a dummy `Chart.yaml` and `requirements.yaml` deduced from the `helmfile.yaml` content, then runs `helm dependency update` to produce od update the corresponding `requirements.lock` file.
`helmfile` then renames it to match the name of the targeted helmfile state file and moves it, so that it becomes adjacent to each `helmfile.yaml`.
Other `helmfile` commands like `sync`, `diiff`, `apply`, `lint` read chart version numbers from the lock file.
Resolves#483
* Improve code organization
To make sure it is still readable after upcoming changes to helmfile
* feat: `helmfile deps` to update dependencies of all the local charts
Resolves#450
* feat: helmfile updates repos and build deps by default
But not update deps. Use `helmfile deps` to update deps, and provide `--skip-deps` to skip updating repos and builds deps in sync/diff/apply/template
Resolves#415
* Improve integration test coverage
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KUOKA Yusuke