#!/bin/bash
set -e
set -x

#master='master'
master='devuan'

cd "$(dirname "$(readlink -f "$BASH_SOURCE")")"

declare -A aliases
aliases=(
	[$(cat latest)]='latest'
)
declare -A noVersion
noVersion=(
	[oldstable]=1
	[stable]=1
	[testing]=1
	[unstable]=1
	[ceres]=1
)

versions=( */ )
versions=( "${versions[@]%/}" )

cat <<-EOH
Maintainers: 	Deprecated code used by debian, but generates devuan images
		suitable for docker.
  
		GitRepo: https://github.com/tianon/docker-brew-debian.git
		GitRepo: https://git.ring-zero.co.uk/docker/docker-brew-debian.git
EOH

branches=( dist-stable dist-unstable dist-oldstable dist-testing $master )

for branch in "${branches[@]}"; do
	if [ "$branch" = $master ]; then
		continue
	fi
	commitRange="$master..$branch"
	commitCount="$(git rev-list "$commitRange" --count 2>/dev/null || true)"
	if [ "$commitCount" ] && [ "$commitCount" -gt 0 ]; then
		echo
		echo '# commits:' "($commitRange)"
		git log --format=format:'- %h %s%n%w(0,2,2)%b' "$commitRange" | sed 's/^/#  /'
	fi
done

# prints "$2$1$3$1...$N"
join() {
	local sep="$1"; shift
	local out; printf -v out "${sep//%/%%}%s" "$@"
	echo "${out#$sep}"
}

for version in "${versions[@]}"; do
	tarball="$version/rootfs.tar.xz"
	commit="$(git log -1 --format='format:%H' "${branches[@]}" -- "$tarball")"
	if [ -z "$commit" ]; then
		echo >&2 "warning: cannot determine commit for $tarball; skipping"
		continue
	fi
	branch=
	for b in "${branches[@]}"; do
		if git merge-base --is-ancestor "$commit" "$b" &> /dev/null; then
			branch="$b"
			break
		fi
	done
	if [ -z "$branch" ]; then
		echo >&2 "error: cannot determine branch for $tarball (commit $commit)"
		exit 1
	fi

	versionAliases=()
	if [ -z "${noVersion[$version]}" ]; then
		fullVersion="$(git show "$commit:$tarball" | tar -xvJ etc/debian_version --to-stdout 2>/dev/null || true)"
		if [ -z "$fullVersion" ] || [[ "$fullVersion" == */ceres ]]; then
			fullVersion="$(eval "$(git show "$commit:$tarball" | tar -xvJ etc/os-release --to-stdout 2>/dev/null || true)" && echo "$VERSION" | cut -d' ' -f1)"
			if [ -z "$fullVersion" ]; then
				# lucid...
				fullVersion="$(eval "$(git show "$commit:$tarball" | tar -xvJ etc/lsb-release --to-stdout 2>/dev/null || true)" && echo "$DISTRIB_DESCRIPTION" | cut -d' ' -f2)" # DISTRIB_DESCRIPTION="Ubuntu 10.04.4 LTS"
			fi
		else
			while [ "${fullVersion%.*}" != "$fullVersion" ]; do
				versionAliases+=( $fullVersion )
				fullVersion="${fullVersion%.*}"
			done
		fi
		if [ "$fullVersion" != "$version" ]; then
			versionAliases+=( $fullVersion )
		fi
	fi
	versionAliases+=( $version $(git show "$commit:$version/suite" 2>/dev/null || true) ${aliases[$version]} )

	echo
	cat <<-EOE
		Tags: $(join ', ' "${versionAliases[@]}")
		GitFetch: refs/heads/$branch
		GitCommit: $commit
		Directory: $version
	EOE

	for imageVariant in slim backports; do
		if [ "$(git show "$commit:$version/$imageVariant/Dockerfile" 2>/dev/null || true)" ]; then
			echo
			cat <<-EOE
				Tags: $version-$imageVariant
				GitFetch: refs/heads/$branch
				GitCommit: $commit
				Directory: $version/$imageVariant
			EOE
		fi
	done
done

dockerfilesBase='https://github.com/cyteen/dockerfiles'
dockerfilesGit="$dockerfilesBase.git"
dockerfilesBranch='master'
dockerfiles="$dockerfilesBase/commits/$dockerfilesBranch/devuan"
#echo "$(curl -fsSL https://github.com/cyteen/dockerfiles/commits/master/devuan/ascii/Dockerfile.atom | tac|tac | awk -F '[ \t]*[<>/]+' '$2 == "id" && $3 ~ /Commit/ { print $4; exit }')"  

#         rcBuggyCommit="$(curl -fsSL "$dockerfiles/rc-buggy/Dockerfile.atom" | tac|tac | awk -F '[ \t]*[<>/]+' '$2 == "id" && $3 ~ /Commit/ { print $4; exit }')"
#experimentalCommit="$(curl -fsSL "$dockerfiles/experimental/Dockerfile.atom" | tac|tac | awk -F '[ \t]*[<>/]+' '$2 == "id" && $3 ~ /Commit/ { print $4; exit }')"
               ceresCommit="$(curl -fsSL "$dockerfiles/ceres/Dockerfile.atom" | tac|tac | awk -F '[ \t]*[<>/]+' '$2 == "id" && $3 ~ /Commit/ { print $4; exit }')"
           beowulfCommit="$(curl -fsSL "$dockerfiles/beowulf/Dockerfile.atom" | tac|tac | awk -F '[ \t]*[<>/]+' '$2 == "id" && $3 ~ /Commit/ { print $4; exit }')"
               asciiCommit="$(curl -fsSL "$dockerfiles/ascii/Dockerfile.atom" | tac|tac | awk -F '[ \t]*[<>/]+' '$2 == "id" && $3 ~ /Commit/ { print $4; exit }')"
             jessieCommit="$(curl -fsSL "$dockerfiles/jessie/Dockerfile.atom" | tac|tac | awk -F '[ \t]*[<>/]+' '$2 == "id" && $3 ~ /Commit/ { print $4; exit }')"

cat <<-EOE

	# unstable/ceres
	Tags: ceres
	GitRepo: $dockerfilesGit
	GitFetch: refs/heads/$dockerfilesBranch
	GitCommit: $ceresCommit
	Directory: devuan/ceres

	# testing/beowulf
	Tags: beowulf
	GitRepo: $dockerfilesGit
	GitFetch: refs/heads/$dockerfilesBranch
	GitCommit: $beowulfCommit
	Directory: devuan/beowulf

	# stable/ascii
	Tags: ascii
	GitRepo: $dockerfilesGit
	GitFetch: refs/heads/$dockerfilesBranch
	GitCommit: $asciiCommit
	Directory: devuan/ascii

	# old-stable/jessie
	Tags: jessie
	GitRepo: $dockerfilesGit
	GitFetch: refs/heads/$dockerfilesBranch
	GitCommit: $jessieCommit
	Directory: devuan/ascii
EOE

#	# sid + rc-buggy
#	Tags: rc-buggy
#	GitRepo: $dockerfilesGit
#	GitFetch: refs/heads/$dockerfilesBranch
#	GitCommit: $rcBuggyCommit
#	Directory: devuan/rc-buggy
#
#	# unstable + experimental
#	Tags: experimental
#	GitRepo: $dockerfilesGit
#	GitFetch: refs/heads/$dockerfilesBranch
#	GitCommit: $experimentalCommit
#	Directory: devuan/experimental