# Makefile for releasing CoreDNS
#
# The release is controlled from coremain/version.go. The version found
# there is used to tag the git repo and to build the assets that are
# uploaded to github (after some sanity checks).
#
# The release should be accompanied by release notes published on
# blog.coredns.io. For example:
# https://blog.coredns.io/2016/09/18/coredns-001-release/
#
# We use https://github.com/progrium/gh-release to automate github stuff
# be sure to have that binary in your path.
#
# Get a list of authors for this release with:
#
# git log --pretty=format:'%an' v001..master | sort -u
# (where v001 is the previous release, obviously you'll need to adjust this)
#
# Side note: check if MAINTAINERS need an update with `git shortlog -s -n` and see if
# someone has more than 5 (arbitrary number).
#
# Steps:
# * Get an access token: https://help.github.com/articles/creating-an-access-token-for-command-line-use/
# * export GITHUB_ACCESS_TOKEN=<token>
# * Up the version in coremain/version.go
# * Run: make -f Makefile.release release
#   * will commit your change with 'Release $VERSION'
#   * push to github
#   * build the release and do all that fluff.
#
# Steps for docker
# * Login into docker: docker login (should have push creds for coredns registry)
# * Run: make -f Makefile.release docker
#
# Docker push should happen after you make the new release and uploaded it to Github.

NAME:=coredns
VERSION:=$(shell grep 'coreVersion' coremain/version.go | awk '{ print $$3 }' | tr -d '"')
ARCH:=$(shell uname -m)
GITHUB:=coredns
DOCKER:=coredns
DOCKER_IMAGE_NAME:=$(DOCKER)/$(NAME)

all:
	@echo Use the 'release' target to start a release

release:	commit push build tar upload

docker: docker-build docker-upload

.PHONY: push
push:
	@echo Pushing release to master
	git push

.PHONY: commit
commit:
	@echo Committing
	git commit -am"Release $(VERSION)"

.PHONY: build
build: build-arm build-darwin build-linux

.PHONY: build-linux
build-linux:
	@echo Building: linux $(VERSION)
	mkdir -p build/Linux      && CGO_ENABLED=0 GOOS=linux             go build -ldflags="-s -w" -o build/Linux/$(NAME)

.PHONY: build-darwin
build-darwin:
	@echo Building: darwin $(VERSION)
	mkdir -p build/Darwin     && CGO_ENABLED=0 GOOS=darwin            go build -ldflags="-s -w" -o build/Darwin/$(NAME)

.PHONY: build-arm
build-arm:
	@echo Building: arm $(VERSION)
	mkdir -p build/Linux/Arm  && CGO_ENABLED=0 GOOS=linux GOARCH=arm  go build -ldflags="-s -w" -o build/Linux/Arm/$(NAME)


.PHONY: tar
tar:
	rm -rf release && mkdir release
	tar -zcf release/$(NAME)_$(VERSION)_linux_$(ARCH).tgz -C build/Linux $(NAME)
	tar -zcf release/$(NAME)_$(VERSION)_linux_armv6l.tgz -C build/Linux/Arm $(NAME)
	tar -zcf release/$(NAME)_$(VERSION)_darwin_$(ARCH).tgz -C build/Darwin $(NAME)

.PHONY: upload
upload:
	@echo Releasing: $(VERSION)
	gh-release create $(GITHUB)/$(NAME) $(VERSION)

.PHONY: docker-build
docker-build:
	CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w"
	docker build -t $(DOCKER_IMAGE_NAME) .
	docker tag $(DOCKER_IMAGE_NAME):latest $(DOCKER_IMAGE_NAME):$(VERSION)

.PHONY: docker-upload
docker-upload:
	@echo Pushing: $(VERSION)
	docker tag $(DOCKER_IMAGE_NAME):latest $(DOCKER_IMAGE_NAME):$(VERSION)
	docker push $(DOCKER_IMAGE_NAME):latest
	docker push $(DOCKER_IMAGE_NAME):$(VERSION)

.PHONY: clean
clean:
	rm -rf release
	rm -rf build