# Makefile for creating and uploading CoreDNS docker image.
#
# First you should do a release and then call this Makefile to create and upload
# the image.
#
# 1. Reuse the issue for this release
# 2. In an issue give the command: /docker VERSION
#    Where VERSION is the version of the release.
# 3. (to test as release /docker -t VERSION can be used.
#
# To release we run, these target from the this Makefile.docker ordered like:
# * make release
# * make docker-push
#
# Testing docker is done e.g. via:
#
# export DOCKER_PASSWORD=<pass>
# export DOCKER_LOGIN=miek
# make VERSION=x.y.z DOCKER=miek -f Makefile.docker release docker-push

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

# VERSION is the version we should download and use.
VERSION:=
# DOCKER is the docker image repo we need to push to.
DOCKER:=
NAME:=coredns
GITHUB:=https://github.com/coredns/coredns/releases/download
# mips is not in LINUX_ARCH because it's not supported by docker manifest. Keep this list in sync with the one in Makefile.release
LINUX_ARCH:=amd64 arm arm64 mips64le ppc64le s390x riscv64
DOCKER_IMAGE_NAME:=$(DOCKER)/$(NAME)
DOCKER_IMAGE_LIST_VERSIONED:=$(shell echo $(LINUX_ARCH) | sed -e "s~mips64le ~~g" | sed -e "s~[^ ]*~$(DOCKER_IMAGE_NAME):&\-$(VERSION)~g")

all:
	@echo Use the 'release' target to download released binaries and build containers per arch, 'docker-push' to build and push a multi arch manifest.
	echo $(DOCKER_IMAGE_LIST_VERSIONED)
	echo $(DOCKER_IMAGE_LIST_LATEST)

release: image-download docker-build

.PHONY: image-download
image-download:
ifeq ($(VERSION),)
	$(error "Please specify a version use. Use VERSION=<version>")
endif

	@# 0. Check until all asset are alive, up to 10 min (asset may not be alive immediately after upload)
	try_max=20; try_sleep=30; \
	for arch in $(LINUX_ARCH); do \
		asset=coredns_$(VERSION)_linux_$${arch}.tgz; \
		for i in $$(seq 1 $$try_max ); do \
			if [ $$(curl -I -L -s -o /dev/null -w "%{http_code}" $(GITHUB)/v$(VERSION)/$$asset) -eq 200 ]; then \
				echo "$$asset is live" ; break; \
			else  \
				echo "$$asset is not live yet..." ; sleep $$try_sleep ; \
			fi ; \
		done ; \
		if [ $$i -eq $$try_max ]; then \
			echo "$$asset is not live after $$try_max tries" ; exit 1; \
		fi ; \
	done
	@rm -rf build/docker
	@mkdir -p build/docker
	@# 1. Copy appropriate coredns binary to build/docker/<arch>
	@# 2. Copy Dockerfile into the correct dir as well.
	@# 3. Unpack the tgz from GitHub into 'coredns' binary.
	for arch in $(LINUX_ARCH); do \
		mkdir build/docker/$${arch}; \
		curl -L $(GITHUB)/v$(VERSION)/coredns_$(VERSION)_linux_$${arch}.tgz > build/docker/$${arch}/coredns.tgz && \
			( cd build/docker/$${arch}; tar xf coredns.tgz && rm coredns.tgz ); \
	done

.PHONY: docker-build
docker-build:
ifeq ($(DOCKER),)
	$(error "Please specify Docker registry to use. Use DOCKER=coredns for releases")
else
	docker version
	for arch in $(LINUX_ARCH); do \
	    cp Dockerfile build/docker/$${arch} ; \
	    DOCKER_ARGS=""; \
	    if [ "$${arch}" = "riscv64" ]; then \
	        DOCKER_ARGS="--build-arg=DEBIAN_IMAGE=debian:unstable-slim --build-arg=BASE=ghcr.io/go-riscv/distroless/static-unstable:nonroot"; \
	    fi; \
	    DOCKER_BUILDKIT=1 docker build --platform=$${arch} -t $(DOCKER_IMAGE_NAME):$${arch}-$(VERSION) $${DOCKER_ARGS} build/docker/$${arch} ;\
	done
endif

.PHONY: docker-push
docker-push:
ifeq ($(VERSION),)
	$(error "Please specify a version use. Use VERSION=<version>")
endif
ifeq ($(DOCKER),)
	$(error "Please specify Docker registry to use. Use DOCKER=coredns for releases")
else
	@# Pushes coredns/coredns-$arch:$version images
	@# Creates manifest for multi-arch image
	@# Pushes multi-arch image to coredns/coredns:$version
	@echo Pushing: $(VERSION) to $(DOCKER_IMAGE_NAME)
	for arch in $(LINUX_ARCH); do \
		docker push $(DOCKER_IMAGE_NAME):$${arch}-$(VERSION) ;\
	done
	docker manifest create --amend $(DOCKER_IMAGE_NAME):$(VERSION) $(DOCKER_IMAGE_LIST_VERSIONED)
	docker manifest create --amend $(DOCKER_IMAGE_NAME):latest $(DOCKER_IMAGE_LIST_VERSIONED)
	docker manifest push --purge $(DOCKER_IMAGE_NAME):$(VERSION)
	docker manifest push --purge $(DOCKER_IMAGE_NAME):latest
	TOKEN=$$(curl -s -H "Content-Type: application/json" -X POST -d "{\"username\":\"$${DOCKER_LOGIN}\",\"password\":\"$${DOCKER_PASSWORD}\"}" "https://hub.docker.com/v2/users/login/" | jq -r .token) ; \
	for arch in $(LINUX_ARCH); do \
		curl -X DELETE -H "Authorization: JWT $${TOKEN}" "https://hub.docker.com/v2/repositories/$(DOCKER_IMAGE_NAME)/tags/$${arch}-$(VERSION)/" ;\
	done
endif