Makefile

# Inspired from microscaling
# https://github.com/microscaling/microscaling/blob/master/Makefile

default: build
build: docker_build output
release: docker_build docker_push output

DOCKER_IMAGE ?= uzer/taskserver
BUILD_VCS_REF = $(strip $(shell git rev-parse --short HEAD))

# APP version (Semver...)
APP_VERSION = $(strip $(shell cat APP_VERSION))
ifndef APP_VERSION
	$(error You need to create a APP_VERSION file to build a release)
endif

# APP ref (Commit, tag...)
APP_VCS_REF = $(strip $(shell cat APP_VCS_REF))
ifndef APP_VCS_REF
	$(error You need to create a APP_VCS_REF file to build a release)
endif

# Find out if the working build directory is clean
GIT_NOT_CLEAN_CHECK = $(shell git status --porcelain)
ifneq (x$(GIT_NOT_CLEAN_CHECK), x)
	DOCKER_TAG_SUFFIX = -dirty
endif

# If we're releasing to Docker Hub, and we're going to mark it with the latest
# tag, it should exactly match a version release
ifeq ($(MAKECMDGOALS), release)
	# Use the version number as the release tag.
	DOCKER_TAG = $(APP_VERSION)-$(APP_VCS_REF)

# Don't push to Docker Hub if this isn't a clean repo
ifneq (x$(GIT_NOT_CLEAN_CHECK), x)
	$(error echo You are trying to release a build based on a dirty repo)
endif

else
	DOCKER_TAG = $(APP_VERSION)-$(APP_VCS_REF)$(DOCKER_TAG_SUFFIX)
endif

docker_build:
	# Build Docker image
	docker build \
		--build-arg APP_VCS_REF=$(APP_VCS_REF) \
		--build-arg APP_VERSION=$(APP_VERSION) \
		--build-arg BUILD_DATE=`date -u +"%Y-%m-%dT%H:%M:%SZ"` \
		--build-arg BUILD_VCS_REF=$(BUILD_VCS_REF) \
		-t $(DOCKER_IMAGE):$(DOCKER_TAG) .

docker_push:
	# Tag image as latest
	docker tag $(DOCKER_IMAGE):$(DOCKER_TAG) $(DOCKER_IMAGE):latest
	# Push to DockerHub
	docker push $(DOCKER_IMAGE):$(DOCKER_TAG)
	docker push $(DOCKER_IMAGE):latest

output:
	@echo Docker Image: $(DOCKER_IMAGE):$(DOCKER_TAG)