NBash

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#!/bin/sh
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#
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# An example hook script to block unannotated tags from entering.
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# Called by "git receive-pack" with arguments: refname sha1-old sha1-new
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#
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# To enable this hook, rename this file to "update".
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#
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# Config
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# ------
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# hooks.allowbadwhitespace
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#   This boolean sets whether a commit that adds bad whitespace will be
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#   allowed in the repository.  By default they won't be.
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# hooks.allowunannotated
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#   This boolean sets whether unannotated tags will be allowed into the
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#   repository.  By default they won't be.
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# hooks.allowdeletetag
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#   This boolean sets whether deleting tags will be allowed in the
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#   repository.  By default they won't be.
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# hooks.allowmodifytag
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#   This boolean sets whether a tag may be modified after creation. By default
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#   it won't be.
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# hooks.allowdeletebranch
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#   This boolean sets whether deleting branches will be allowed in the
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#   repository.  By default they won't be.
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# hooks.denycreatebranch
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#   This boolean sets whether remotely creating branches will be denied
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#   in the repository.  By default this is allowed.
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#
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# --- Command line
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refname="$1"
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oldrev="$2"
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newrev="$3"
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# --- Safety check
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if [ -z "$GIT_DIR" ]; then
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	echo "Don't run this script from the command line." >&2
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	echo " (if you want, you could supply GIT_DIR then run" >&2
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	echo "  $0 <ref> <oldrev> <newrev>)" >&2
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	exit 1
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fi
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if [ -z "$refname" -o -z "$oldrev" -o -z "$newrev" ]; then
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	echo "usage: $0 <ref> <oldrev> <newrev>" >&2
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	exit 1
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fi
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# --- Config
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allowunannotated=$(git config --type=bool hooks.allowunannotated)
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allowdeletebranch=$(git config --type=bool hooks.allowdeletebranch)
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denycreatebranch=$(git config --type=bool hooks.denycreatebranch)
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allowdeletetag=$(git config --type=bool hooks.allowdeletetag)
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allowmodifytag=$(git config --type=bool hooks.allowmodifytag)
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# check for no description
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projectdesc=$(sed -e '1q' "$GIT_DIR/description")
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case "$projectdesc" in
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"Unnamed repository"* | "")
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	echo "*** Project description file hasn't been set" >&2
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	exit 1
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	;;
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esac
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# --- Check types
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# if $newrev is 0000...0000, it's a commit to delete a ref.
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zero=$(git hash-object --stdin </dev/null | tr '[0-9a-f]' '0')
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if [ "$newrev" = "$zero" ]; then
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	newrev_type=delete
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else
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	newrev_type=$(git cat-file -t $newrev)
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fi
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check_diff=no
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case "$refname","$newrev_type" in
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	refs/tags/*,commit)
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		# un-annotated tag
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		short_refname=${refname##refs/tags/}
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		if [ "$allowunannotated" != "true" ]; then
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			echo "*** The un-annotated tag, $short_refname, is not allowed in this repository" >&2
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			echo "*** Use 'git tag [ -a | -s ]' for tags you want to propagate." >&2
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			exit 1
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		fi
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		;;
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	refs/tags/*,delete)
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		# delete tag
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		if [ "$allowdeletetag" != "true" ]; then
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			echo "*** Deleting a tag is not allowed in this repository" >&2
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			exit 1
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		fi
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		;;
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	refs/tags/*,tag)
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		# annotated tag
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		if [ "$allowmodifytag" != "true" ] && git rev-parse $refname > /dev/null 2>&1
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		then
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			echo "*** Tag '$refname' already exists." >&2
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			echo "*** Modifying a tag is not allowed in this repository." >&2
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			exit 1
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		fi
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		;;
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	refs/heads/*,commit)
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		# branch
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		check_diff=yes
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		if [ "$oldrev" = "$zero" -a "$denycreatebranch" = "true" ]; then
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			echo "*** Creating a branch is not allowed in this repository" >&2
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			exit 1
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		fi
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		;;
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	refs/heads/*,delete)
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		# delete branch
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		if [ "$allowdeletebranch" != "true" ]; then
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			echo "*** Deleting a branch is not allowed in this repository" >&2
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			exit 1
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		fi
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		;;
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	refs/remotes/*,commit)
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		# tracking branch
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		check_diff=yes
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		;;
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	refs/remotes/*,delete)
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		# delete tracking branch
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		if [ "$allowdeletebranch" != "true" ]; then
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			echo "*** Deleting a tracking branch is not allowed in this repository" >&2
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			exit 1
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		fi
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		;;
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	*)
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		# Anything else (is there anything else?)
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		echo "*** Update hook: unknown type of update to ref $refname of type $newrev_type" >&2
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		exit 1
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		;;
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esac
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if [ $check_diff = yes ]; then
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	allow_bad_whitespace=$(git config --bool hooks.allowbadwhitespace)
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	if [ "$allow_bad_whitespace" != true ]; then
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		# If pushing a new branch, compare it with the empty object.
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		[ "$oldrev" != "$zero" ] ||
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			oldrev=4b825dc642cb6eb9a060e54bf8d69288fbee4904
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		exec git diff --check "$oldrev" "$newrev" --
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	fi
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fi
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# --- Finished
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exit 0
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