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# 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 coredns.io.
# For example: https://coredns.io/2016/09/18/coredns-001-release/ Also send an
# email to coredns-discuss@ to announce the new version.
#
# Getting the authors for this release is done with the following command line
# git log --pretty=format:'%an' v$(VERSION)..master | sort -u
#
# Steps:
# * Up the version in coremain/version.go
# * Do a make -f Makefile.doc
# * go generate
# * Send PR to get this merged.
#
# * Open an issue for this release
# * In an issue give the command: /release: master
# * (to test as release /release: -t master can be used.
#
# See github.com/coredns/release for documentation README on what needs to be setup for this to be
# automated (can still be done by hand if needed). Especially what environment variables need to be
# set!
#
# To release we run, where 'release' and 'docker' only locally build assets; these are the same
# targets that get executed in case of testing.
# * make release
# * make github-push
# * make docker
# * make docker-push

EMPTY:=
SPACE:=$(EMPTY) $(EMPTY)
COMMA:=$(EMPTY),$(EMPTY)

ifeq (, $(shell which curl))
    $(error "No curl in $$PATH, please install")
endif

DOCKER:=
NAME:=coredns
VERSION:=$(shell grep 'CoreVersion' coremain/version.go | awk '{ print $$3 }' | tr -d '"')
GITHUB:=coredns
DOCKER_IMAGE_NAME:=$(DOCKER)/$(NAME)
LINUX_ARCH:=amd64 arm arm64 ppc64le s390x
PLATFORMS:=$(subst $(SPACE),$(COMMA),$(foreach arch,$(LINUX_ARCH),linux/$(arch)))

ifeq ($(DOCKER),)
    $(error "Please specify Docker registry to use. Use DOCKER=coredns for releases")
endif

all:
	@echo Use the 'release' target to build a release, 'docker' for docker build.

release: pre build tar

docker: docker-build

.PHONY: pre
pre:
	go get github.com/estesp/manifest-tool

.PHONY: build
build:
	@echo Cleaning old builds
	@rm -rf build && mkdir build
	@echo Building: darwin/amd64 - $(VERSION)
	mkdir -p build/darwin/amd64 && $(MAKE) coredns BINARY=build/darwin/amd64/$(NAME) SYSTEM="GOOS=darwin GOARCH=amd64" CHECKS="godeps" VERBOSE=""
	@echo Building: windows/amd64 - $(VERSION)
	mkdir -p build/windows/amd64 && $(MAKE) coredns BINARY=build/windows/amd64/$(NAME) SYSTEM="GOOS=windows GOARCH=amd64" CHECKS="" VERBOSE=""
	@echo Building: linux/$(LINUX_ARCH) - $(VERSION) ;\
	for arch in $(LINUX_ARCH); do \
	    mkdir -p build/linux/$$arch  && $(MAKE) coredns BINARY=build/linux/$$arch/$(NAME) SYSTEM="GOOS=linux GOARCH=$$arch" CHECKS="" VERBOSE="" ;\
	done

.PHONY: tar
tar:
	@echo Cleaning old releases
	@rm -rf release && mkdir release
	tar -zcf release/$(NAME)_$(VERSION)_darwin_amd64.tgz -C build/darwin/amd64 $(NAME)
	tar -zcf release/$(NAME)_$(VERSION)_windows_amd64.tgz -C build/windows/amd64 $(NAME)
	for arch in $(LINUX_ARCH); do \
	    tar -zcf release/$(NAME)_$(VERSION)_linux_$$arch.tgz -C build/linux/$$arch $(NAME) ;\
	done

.PHONY: github-push
github-push:
	@echo Releasing: $(VERSION)
	@$(eval RELEASE:=$(shell curl -s -d '{"tag_name": "v$(VERSION)", "name": "v$(VERSION)"}' "https://api.github.com/repos/$(GITHUB)/$(NAME)/releases?access_token=${GITHUB_ACCESS_TOKEN}" | grep -m 1 '"id"' | tr -cd '[[:digit:]]'))
	@echo ReleaseID: $(RELEASE)
	@for asset in `ls -A release`; do \
	    curl -o /dev/null -X POST \
	      -H "Content-Type: application/gzip" \
	      --data-binary "@release/$$asset" \
	      "https://uploads.github.com/repos/$(GITHUB)/$(NAME)/releases/$(RELEASE)/assets?name=$${asset}&access_token=${GITHUB_ACCESS_TOKEN}" ; \
	done

.PHONY: docker-build
docker-build: tar
	@# Steps:
	@# 1. Copy appropriate coredns binary to build/docker/linux/<arch>
	@# 2. Copy Dockerfile to build/docker/linux/<arch>
	@rm -rf build/docker
	for arch in $(LINUX_ARCH); do \
	    mkdir -p build/docker/linux/$$arch ;\
	    tar -xzf release/$(NAME)_$(VERSION)_linux_$$arch.tgz -C build/docker/linux/$$arch ;\
	    cp Dockerfile build/docker/linux/$$arch ;\
	    docker build -t coredns build/docker/linux/$$arch ;\
	    docker tag coredns $(DOCKER_IMAGE_NAME):coredns-$$arch ;\
	done

.PHONY: docker-push
docker-push:
	@echo $(DOCKER_PASSWORD) | docker login -u $(DOCKER_LOGIN) --password-stdin
	@echo Pushing: $(VERSION) to $(DOCKER_IMAGE_NAME)
	for arch in $(LINUX_ARCH); do \
	    docker push $(DOCKER_IMAGE_NAME):coredns-$$arch ;\
	done
	manifest-tool push from-args --platforms $(PLATFORMS) --template $(DOCKER_IMAGE_NAME):coredns-ARCH --target $(DOCKER_IMAGE_NAME):$(VERSION)
	manifest-tool push from-args --platforms $(PLATFORMS) --template $(DOCKER_IMAGE_NAME):coredns-ARCH --target $(DOCKER_IMAGE_NAME):latest

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