GNUmakefile

# Official and semi-official architectures: https://github.com/docker-library/official-images#architectures-other-than-amd64
# Webproc for linux is available for amd64, i386, arm and arm64
# Docker's names for these are (linux/...) amd64 arm/v7 i386 arm64
ARCHITECTURES=amd64 arm/v7 i386 arm64
DOCKER_PLATFORMS=linux/amd64,linux/arm/v7,linux/i386,linux/arm64

IMAGE_NAME=outlyernet/dnsmasq-multiarch

VERSIONS=$(shell ./get_versions.bash)
TIMESTAMP=$(shell date +%Y%m%d)

# Figure the versions

all: build $(ARCHITECTURES)

build:
	@# Build and set the multiplatform tag
	docker buildx build \
		--platform $(DOCKER_PLATFORMS) \
		--tag $(IMAGE_NAME):latest \
		--tag $(IMAGE_NAME):$(VERSIONS) \
		--tag $(IMAGE_NAME):$(TIMESTAMP) \
		.

# Note: Passing --load to make it easier to debug, with it they are
#       made available in the (local) docker server instead of remaining
#       "hidden" in the build cache (this can't be applied to the manifest
#       list (i.e. the multiarch tag)
# "Build" per-platform to tag, since latest-$ARCHITECTURE used to be provided
$(ARCHITECTURES):
	@# The subst below replaces arm/v7 since that's not a valid tag name
	docker buildx build --load \
		--platform linux/$@ \
		--tag $(IMAGE_NAME):latest-$(subst arm/v7,armv7,$@) \
		--tag $(IMAGE_NAME):$(VERSIONS)-$(subst arm/v7,armv7,$@) \
		--tag $(IMAGE_NAME):$(TIMESTAMP)-$(subst arm/v7,armv7,$@) \
		.

# Repository-specific stuff. Can only be used as-is by me

push:
	docker buildx build --push \
		--platform $(DOCKER_PLATFORMS) \
		--tag $(IMAGE_NAME):latest \
		--tag $(IMAGE_NAME):$(VERSIONS) \
		--tag $(IMAGE_NAME):$(TIMESTAMP) \
		.
	for arch in $(ARCHITECTURES); do \
	    archtag=`echo $$arch | sed 's!arm/v7!armv7!'` ; \
		docker buildx build --push \
			--platform linux/$$arch \
			--tag $(IMAGE_NAME):latest-$$archtag \
			--tag $(IMAGE_NAME):$(VERSIONS)-$$archtag \
			--tag $(IMAGE_NAME):$(TIMESTAMP)-$$archtag \
			. ; \
	done


.PHONY: all build push $(ARCHITECTURES)