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+#!/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