build

#!/usr/bin/env bash

shopt -s globstar

root_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"

image_pull() {
	local pull_url file dir
    pull_url="$1"
	dir="$2"
	file="${pull_url##*/}"

	echo "Pulling $pull_url"
	curl -fSsL "$pull_url" > "$dir/rootfs.tar.gz"
}

build() {
	build_dir="${root_dir}/.build"
	rm -rf ${build_dir}
	mkdir ${build_dir}

	declare manifest_files="${*:-versions/**/manifest}"

	for manifest_file in $manifest_files; do
		local version_dir
		version_dir="${manifest_file%/*}"
		declare image_files="${*:-$version_dir/image*}"

		version="$(basename ${version_dir})"
	
		for image_file in $image_files; do
			extension="${image_file##*.}"
			build_image_dir="${build_dir}/${version}/${extension}"
			mkdir -p $build_image_dir
			
			source "$manifest_file"
			source "$image_file"

			cp "$version_dir/Dockerfile" "$build_image_dir"
			image_pull "$ALPINE_PULL_URL" "$build_image_dir"

			docker build -t "$IMAGE_TAG" "$build_image_dir"
		done
	done
}

push(){

	declare manifest_files="${*:-versions/**/manifest}"

	for manifest_file in $manifest_files; do
		local version_dir
		version_dir="${manifest_file%/*}"
		
		declare image_files="${*:-$version_dir/image*}"
		declare -a tags

		source "$manifest_file"

		for image_file in $image_files; do
			source "$image_file"
			local tag
			tag="${IMAGE_TAG}"	
			tags+=("$tag")

			docker push $tag
		done

		for tag in "${MANIFEST_TAGS[@]}"; do

			docker manifest create $tag ${tags[@]}

			for image_file in $image_files; do
				source "$image_file"
				declare -a options

				if [[ ! -z "${DOCKER_OS}" ]]; then
					options+=("--os $DOCKER_OS")
				fi
				
				if [[ ! -z "${DOCKER_ARCH}" ]]; then
					options+=("--arch $DOCKER_ARCH")
				fi

				if [[ ! -z "${DOCKER_VARIANT}" ]]; then
					options+=("--variant $DOCKER_VARIANT")
				fi

				docker manifest annotate ${options[@]} $tag $IMAGE_TAG

				unset options
			done

			docker manifest push $tag
		done

		unset tags
	done
}

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

main "$@"