#!/bin/sh
#
# An example hook script to blocks unannotated tags from entering.
# Called by git-receive-pack with arguments: refname sha1-old sha1-new
#
# Config
# ------
# hooks.update-allow-tags-branches.unannotatedtag
#   This boolean sets whether unannotated tags will be allowed into the
#   repository.  By default they won't be.
# hooks.update-allow-tags-branches.deletetag
#   This boolean sets whether deleting tags will be allowed in the
#   repository.  By default they won't be.
# hooks.update-allow-tags-branches.deletebranch
#   This boolean sets whether deleting branches will be allowed in the
#   repository.  By default they won't be.
# hooks.update-allow-tags-branches.nakedtag
#   This boolean sets whether tags are allowed into the repo to commits
#   that are not pointed to by a branch. By default they won't be.
#

. $(dirname $0)/functions

# --- Command line
refname="$1"
oldrev="$2"
newrev="$3"

# --- Config
allowunannotatedtag=$(git config --bool hooks.update-allow-tags-branches.unannotatedtag)
allowdeletebranch=$(git config --bool hooks.update-allow-tags-branches.deletebranch)
allowdeletetag=$(git config --bool hooks.update-allow-tags-branches.deletetag)
allownakedtag=$(git config --bool hooks.update-allow-tags-branches.nakedtag)

# --- Check types
# if $newrev is 0000...0000, it's a commit to delete a ref.
if [ "$newrev" = "0000000000000000000000000000000000000000" ]; then
	newrev_type=delete
else
	newrev_type=$(git-cat-file -t $newrev)
fi

case "$refname","$newrev_type" in
	refs/tags/*,commit)
		# un-annotated tag
		short_refname=${refname##refs/tags/}
		if [ "$allowunannotatedtag" != "true" ]; then
			display_error_message "Unannotated tags ($short_refname) are not allowed"
			exit 1
		fi
		contains=$(git branch --contains "$newrev" | wc -l)
		if [ $contains -eq 0 -a "$allownakedtag" != "true" ] ; then
			display_error_message "The tag $short_refname is not included in any branch"
			exit 1
		fi
		;;
	refs/tags/*,delete)
		# delete tag
		if [ "$allowdeletetag" != "true" ]; then
			display_error_message "Deleting tags is not allowed"
			exit 1
		fi
		;;
	refs/tags/*,tag)
		# annotated tag
		short_refname=${refname##refs/tags/}
		contains=$(git branch --contains "$newrev" | wc -l)
		if [ $contains -eq 0 -a "$allownakedtag" != "true" ] ; then
			display_error_message "The tag $short_refname is not included in any branch"
			exit 1
		fi
		;;
	refs/heads/*,commit)
		# branch
		;;
	refs/heads/*,delete)
		# delete branch
		if [ "$allowdeletebranch" != "true" ]; then
			echo "*** Deleting a branch is not allowed in this repository" >&2
			exit 1
		fi
		;;
	refs/remotes/*,commit)
		# tracking branch
		;;
	refs/remotes/*,delete)
		# delete tracking branch
		if [ "$allowdeletebranch" != "true" ]; then
			echo "*** Deleting a tracking branch is not allowed in this repository" >&2
			exit 1
		fi
		;;
	*)
		# Anything else (is there anything else?)
		echo "*** Update hook: unknown type of update to ref $refname of type $newrev_type" >&2
		exit 1
		;;
esac

# --- Finished
exit 0