build

#!/usr/bin/env bash

declare BUILD_IMAGE="${BUILD_IMAGE:-alpine-builder}"
declare BUILD_PREFIX="${BUILD_PREFIX:-alpine-build-}"
declare OPTIONS="${OPTIONS:-versions/**/options}"

build() {
	declare build_files="${*:-$OPTIONS}"
	: "${build_files:?}"

	docker build -t "$BUILD_IMAGE" builder

	for file in $build_files; do
		( source "$file"
		local release="$RELEASE"
		local build="${BUILD_PREFIX}${release}"
		local build_options="$BUILD_OPTIONS"
		local version_dir="$(dirname "$file")"
		local tags="$TAGS"

		: "${build:?}" "${tags:?}" "${build_options:?}" "${release:?}"

		docker rm "$build" 2>/dev/null || true

		docker run --name "${build}" "$BUILD_IMAGE" $build_options \
			> "./$version_dir/rootfs.tar.gz"

		for tag in $tags; do
			docker build -t "$tag" "$version_dir"
			if [[ "$CIRCLE_BUILD_NUM" ]]; then
				mkdir -p images \
				&& docker tag -f "$tag" "${tag}-${CIRCLE_BUILD_NUM}" \
				&& docker save "${tag}-${CIRCLE_BUILD_NUM}" \
					| gzip -c > "images/${tag//\//_}-${CIRCLE_BUILD_NUM}.tar.gz" \
				&& docker rmi "${tag}-${CIRCLE_BUILD_NUM}" || true
			fi
		done
		docker rm "$build" 2>/dev/null || true )
	done
}

commit() {
	declare rootfs_files="${*:-versions/**/rootfs.tar.gz}"
	local build_num="${CIRCLE_BUILD_NUM:-nobuild}"

	for file in $rootfs_files; do
		local release="$(basename "$(dirname "$file")")"
		local version_dir="$(dirname "$file")"
		local current_branch=$(git rev-parse --abbrev-ref HEAD)

		: "${release:?}"

		git checkout -B "rootfs-$release"
		git add -f -- "$file"
		git commit -m "pushing release $release for build $build_num"
		git push -f origin "rootfs-$release"
		git checkout "$current_branch"
	done
}

run_tests() {
	declare build_files="${*:-$OPTIONS}"
	declare -a test_files
	for file in $build_files; do
		source "$file"
		local tag
		tag="$(echo "$TAGS" | cut -d' ' -f1)"
		tag="${tag//:/-}"
		tag="${tag//\//_}"
		test_files+=("test/test_${tag}.bats")
	done
	bats "${test_files[@]}"
}

push() {
	declare build_files="${*:-$OPTIONS}"
	for file in $build_files; do
		( source "$file"
		for tag in $TAGS; do
			if docker history $tag &> /dev/null; then
				[[ $PUSH_IMAGE ]] && docker push $tag
			fi
		done
		exit 0 )
	done
}

library() {
	local refs="$(git ls-remote --heads origin)"
	echo "# maintainer: Glider Labs <team@gliderlabs.com> (@gliderlabs)"
	for file in versions/library-*/options; do
		source "$file"
		local version="${RELEASE#v}"
		echo
		for tag in $TAGS; do
			local tag="$(echo "$tag" | cut -d: -f2)"
			read sha _ <<< $(echo "$refs" | grep rootfs-library-$version)
			echo "$tag:" "git://github.com/gliderlabs/docker-alpine@$sha" "versions/library-$version"
		done
	done
}

main() {
	set -eo pipefail; [[ "$TRACE" ]] && set -x
	declare cmd="$1"
	case "$cmd" in
		test)	shift;	run_tests "$@";;
		commit)	shift;	commit "$@";;
		push)	shift;	push "$@";;
		library) shift; library;;
		*)		build "$@";;
	esac
}

main "$@"