#!/bin/sh

#

# An example hook script to block unannotated tags from entering.

# Called by "git receive-pack" with arguments: refname sha1-old sha1-new

#

# To enable this hook, rename this file to "update".

#

# Config

# ------

# hooks.allowunannotated

#   This boolean sets whether unannotated tags will be allowed into the

#   repository.  By default they won't be.

# hooks.allowdeletetag

#   This boolean sets whether deleting tags will be allowed in the

#   repository.  By default they won't be.

# hooks.allowmodifytag

#   This boolean sets whether a tag may be modified after creation. By default

#   it won't be.

# hooks.allowdeletebranch

#   This boolean sets whether deleting branches will be allowed in the

#   repository.  By default they won't be.

# hooks.denycreatebranch

#   This boolean sets whether remotely creating branches will be denied

#   in the repository.  By default this is allowed.

#

# --- Command line

refname="$1"

oldrev="$2"

newrev="$3"

# --- Safety check

if [ -z "$GIT_DIR" ]; then

	echo "Don't run this script from the command line." >&2

	echo " (if you want, you could supply GIT_DIR then run" >&2

	echo "  $0 <ref> <oldrev> <newrev>)" >&2

	exit 1

fi

if [ -z "$refname" -o -z "$oldrev" -o -z "$newrev" ]; then

	echo "usage: $0 <ref> <oldrev> <newrev>" >&2

	exit 1

fi

# --- Config

allowunannotated=$(git config --type=bool hooks.allowunannotated)

allowdeletebranch=$(git config --type=bool hooks.allowdeletebranch)

denycreatebranch=$(git config --type=bool hooks.denycreatebranch)

allowdeletetag=$(git config --type=bool hooks.allowdeletetag)

allowmodifytag=$(git config --type=bool hooks.allowmodifytag)

# check for no description

projectdesc=$(sed -e '1q' "$GIT_DIR/description")

case "$projectdesc" in

"Unnamed repository"* | "")

	echo "*** Project description file hasn't been set" >&2

	exit 1

	;;

esac

# --- Check types

# if $newrev is 0000...0000, it's a commit to delete a ref.

zero=$(git hash-object --stdin </dev/null | tr '[0-9a-f]' '0')

if [ "$newrev" = "$zero" ]; 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 [ "$allowunannotated" != "true" ]; then

			echo "*** The un-annotated tag, $short_refname, is not allowed in this repository" >&2

			echo "*** Use 'git tag [ -a | -s ]' for tags you want to propagate." >&2

			exit 1

		fi

		;;

	refs/tags/*,delete)

		# delete tag

		if [ "$allowdeletetag" != "true" ]; then

			echo "*** Deleting a tag is not allowed in this repository" >&2

			exit 1

		fi

		;;

	refs/tags/*,tag)

		# annotated tag

		if [ "$allowmodifytag" != "true" ] && git rev-parse $refname > /dev/null 2>&1

		then

			echo "*** Tag '$refname' already exists." >&2

			echo "*** Modifying a tag is not allowed in this repository." >&2

			exit 1

		fi

		;;

	refs/heads/*,commit)

		# branch

		if [ "$oldrev" = "$zero" -a "$denycreatebranch" = "true" ]; then

			echo "*** Creating a branch is not allowed in this repository" >&2

			exit 1

		fi

		;;

	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