Add Docker labels.

core/poller/Makefile

@@ -32,7 +32,8 @@ ifeq ($(VERSION),)
 endif
 # rpm is wierd and changes - to _ in versions.
 RPMVERSION:=$(shell echo $(VERSION) | tr -- - _)
-DATE:=$(shell date)
+DATE:=$(shell date -u +%Y-%m-%dT%H:%M:%SZ)
+COMMIT:=$(shell git rev-parse --short HEAD || echo 0)
 
 # Makefile targets follow.
 
@@ -264,7 +265,11 @@ $(BINARY)_$(VERSION)-$(ITERATION)_armhf.deb: package_build_linux_armhf check_fpm
 		--chdir $<
 
 docker:
-	docker build -f init/docker/Dockerfile -t $(DHUSER)/$(BINARY):local .
+	docker build -f init/docker/Dockerfile \
+		--build-arg "BUILD_DATE=${DATE}" \
+		--build-arg "COMMIT=${COMMIT}" \
+		--build-arg "VERSION=${VERSION}" \
+		--tag $(DHUSER)/$(BINARY):local .
 
 # Build an environment that can be packaged for linux.
 package_build_linux: readme man linux

core/poller/init/docker/Dockerfile

@@ -2,9 +2,15 @@
 # building static go binary with Debian golang container
 #
 
-FROM golang:stretch as builder
 ARG ARCH=amd64
 ARG OS=linux
+ARG BUILD_DATE=0
+ARG COMMIT=0
+ARG VERSION=development
+
+FROM golang:stretch as builder
+ARG ARCH
+ARG OS
 
 RUN mkdir -p $GOPATH/pkg/mod $GOPATH/bin $GOPATH/src/github.com/davidnewhall/unifi-poller
 RUN apt-get update \
@@ -15,8 +21,7 @@ COPY . $GOPATH/src/github.com/davidnewhall/unifi-poller
 WORKDIR $GOPATH/src/github.com/davidnewhall/unifi-poller
 
 RUN dep ensure --vendor-only \
-  && CGO_ENABLED=0 make unifi-poller.${ARCH}.${OS} \
+  && CGO_ENABLED=0 make unifi-poller.${ARCH}.${OS}
-  && mv unifi-poller.${ARCH}.${OS} unifi-poller
 
 #
 # creating container for run
@@ -28,8 +33,27 @@ RUN dep ensure --vendor-only \
 #
 
 FROM scratch
+ARG ARCH
+ARG OS
+ARG BUILD_DATE
+ARG COMMIT
+ARG VERSION
 
-COPY --from=builder /go/src/github.com/davidnewhall/unifi-poller/unifi-poller /unifi-poller
+# Build-time metadata as defined at https://github.com/opencontainers/image-spec/blob/master/annotations.md
+LABEL org.opencontainers.image.created="${BUILD_DATE}" \
+      org.opencontainers.image.title="UniFi Poller" \
+      org.opencontainers.image.documentation="https://github.com/davidnewhall/unifi-poller/wiki" \
+      org.opencontainers.image.description="Polls a UniFi controller and stores metrics in InfluxDB" \
+      org.opencontainers.image.url="https://github.com/davidnewhall/unifi-poller" \
+      org.opencontainers.image.revision="${COMMIT}" \
+      org.opencontainers.image.source="https://github.com/davidnewhall/unifi-poller" \
+      org.opencontainers.image.vendor="Go Lift" \
+      org.opencontainers.image.authors="David Newhall II <david at sleepers dot pro>" \
+      org.opencontainers.image.architecture="${OS} ${ARCH}" \
+      org.opencontainers.image.licenses="MIT" \
+      org.opencontainers.image.version="${VERSION}"
+
+COPY --from=builder /go/src/github.com/davidnewhall/unifi-poller/unifi-poller.${ARCH}.${OS} /unifi-poller
 COPY --from=builder /go/src/github.com/davidnewhall/unifi-poller/examples/up.conf.example /etc/unifi-poller/up.conf
 
 VOLUME [ "/etc/unifi-poller" ]

core/poller/init/docker/hooks/build

@@ -7,6 +7,10 @@ set -e -o pipefail
 # The Docker Cloud config must pass in the BUILDS env variable.
 # See README.md (in this dir) and the screenshot for more info.
 
+VERSION=$(git tag -l --merged | tail -n1 | tr -d v) # 1.2.3
+DATE=$(date -u +%Y-%m-%dT%H:%M:%SZ)
+COMMIT=$(git rev-parse --short HEAD)
+
 # Build each configured image from Docker Cloud.
 for build in $BUILDS; do
   # os:name:arch:variant
@@ -15,6 +19,9 @@ for build in $BUILDS; do
   echo "Building Image ${IMAGE_NAME}_${os}_${name}"
   docker build \
     --build-arg "ARCH=${name}" \
+    --build-arg "BUILD_DATE=${DATE}" \
+    --build-arg "COMMIT=${COMMIT}" \
+    --build-arg "VERSION=${VERSION}" \
     --tag "${IMAGE_NAME}_${os}_${name}" \
     --file Dockerfile ../..
 done