scripts/git/git-tag-update

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#!/bin/sh
#
# git-tag-update, Copyright © 2012 Matteo Cypriani
#
# This program is free software. It comes without any warranty, to
# the extent permitted by applicable law. You can redistribute it
# and/or modify it under the terms of the Do What The Fuck You Want
# To Public License, Version 2, as published by Sam Hocevar. See
# http://sam.zoy.org/wtfpl/COPYING for more details.
#
# This script allows one to update a Git tag message while keeping its
# original date. The tag's author will be changed to whatever is the
# current author (you can change it temporarily with git config if you
# need to update commits with different authors).
set -e
#set -x
if [ $# -ne 1 ] ; then
echo "Usage: $0 <tag-name>"
exit 1
fi
TAG=$1
GIT_COMMITTER_DATE="$(git tag -v $TAG 2>/dev/null|grep ^tagger | cut -f5- -d' ')"
export GIT_COMMITTER_DATE
git tag -sf $TAG $TAG
echo "Old tag commiter date: $GIT_COMMITTER_DATE"
GIT_COMMITTER_DATE="$(git tag -v $TAG 2>/dev/null|grep ^tagger | cut -f5- -d' ')"
echo "New tag commiter date: $GIT_COMMITTER_DATE"