#!/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 linerefname="$1"oldrev="$2"newrev="$3" # --- Safety checkif [ -z "$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 "  $0 <ref> <oldrev> <newrev>)" >&2	exit 1fi if [ -z "$refname" -o -z "$oldrev" -o -z "$newrev" ]; then	echo "usage: $0 <ref> <oldrev> <newrev>" >&2	exit 1fi # --- Configallowunannotated=$(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 descriptionprojectdesc=$(sed -e '1q' "$GIT_DIR/description")case "$projectdesc" in"Unnamed repository"* | "")	echo "*** Project description file hasn't been set" >&2	exit 1	;;esac # --- Check types# if $newrev is 0000...0000, it's a commit to delete a ref.zero="0000000000000000000000000000000000000000"if [ "$newrev" = "$zero" ]; then	newrev_type=deleteelse	newrev_type=$(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 # --- Finishedexit 0