source: SaveSpace.git/hooks/update.sample

#!/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