docker.mk

.PHONY: docker.build docker.pkg

SHARD=0
SHARDS=1

dockerfiles:=$(shell ls docker/build/*/Dockerfile)
all_images:=$(patsubst docker/build/%/Dockerfile,%,$(dockerfiles))

# Used in the test.mk file as well.
images:=$(if $(TRAVIS_COMMIT_RANGE),$(shell git diff --name-only $(TRAVIS_COMMIT_RANGE) | python util/parsefiles.py),$(all_images))
# Only use images that actually contain a Dockerfile
images:=$(shell echo "$(all_images) $(images)" | tr " " "\n" | sort | uniq -d)

docker_build=docker.build.
docker_pkg=docker.pkg.
docker_push=docker.push.

help: docker.help

docker.help:
	@echo '    Docker:'
	@echo '        $$image: any dockerhub image'
	@echo '        $$container: any container defined in docker/build/$$container/Dockerfile'
	@echo ''
	@echo '        $(docker_pull)$$image        pull $$image from dockerhub'
	@echo ''
	@echo '        $(docker_build)$$container   build $$container'
	@echo '        $(docker_pkg)$$container     package $$container for a push to dockerhub'
	@echo '        $(docker_push)$$container    push $$container to dockerhub '
	@echo ''
	@echo '        docker.build          build all defined docker containers (based on dockerhub base images)'
	@echo '        docker.pkg            package all defined docker containers (using local base images)'
	@echo '        docker.push           push all defined docker containers'
	@echo ''

# N.B. / is used as a separator so that % will match the /
# in something like 'edxops/trusty-common:latest'
# Also, make can't handle ':' in filenames, so we instead '@'
# which means the same thing to docker
docker_pull=docker.pull/

build: docker.build

pkg: docker.pkg

clean: docker.clean

docker.clean:
	rm -rf .build

docker.build: $(foreach image,$(images),$(docker_build)$(image))
docker.pkg: $(foreach image,$(images),$(docker_pkg)$(image))
docker.push: $(foreach image,$(images),$(docker_push)$(image))

$(docker_pull)%:
	docker pull $(subst @,:,$*)

$(docker_build)%: docker/build/%/Dockerfile
	docker build -f $< .

$(docker_pkg)%: .build/%/Dockerfile.pkg
	docker build -t $*:latest -f $< .

$(docker_push)%: $(docker_pkg)%
	docker tag $*:latest edxops/$*:latest
	docker push edxops/$*:latest


.build/%/Dockerfile.d: docker/build/%/Dockerfile Makefile
	@mkdir -p .build/$*
	$(eval BASE_IMAGE_TAG=$(shell grep "^\s*ARG BASE_IMAGE_TAG" $< | sed -E "s/ARG BASE_IMAGE_TAG=//"))
	@# I have no idea why the final sed is eating the first character of the substitution...
	$(eval FROM=$(shell grep "^\s*FROM" docker/build/ecommerce/Dockerfile  | sed -E "s/FROM //" | sed -E "s/:/@/g" | sed -E 's/\$\{BASE_IMAGE_TAG\}/ $(BASE_IMAGE_TAG)/'))
	$(eval EDXOPS_FROM=$(shell echo "$(FROM)" | sed -E "s#edxops/([^@]+)(@.*)?#\1#"))
	@echo "Base Image Tag: $(BASE_IMAGE_TAG)"
	@echo $(FROM)
	@echo $(EDXOPS_FROM)
	@echo "$(docker_build)$*: $(docker_pull)$(FROM)" > $@
	@if [ "$(EDXOPS_FROM)" != "$(FROM)" ]; then \
	echo "$(docker_pkg)$*: $(docker_pkg)$(EDXOPS_FROM:@%=)" >> $@; \
	else \
	echo "$(docker_pkg)$*: $(docker_pull)$(FROM)" >> $@; \
	fi

.build/%/Dockerfile.pkg: docker/build/%/Dockerfile Makefile
	@mkdir -p .build/$*
	@# perl p (print the line) n (loop over every line) e (exec the regex), like sed but cross platform

-include $(foreach image,$(images),.build/$(image)/Dockerfile.d)