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#!/bin/sh
#
# Copyright 2010 Joel Weinberger
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#
# This script creates a branch in a git repository with an empty history. This
# puts the new branch in effectively the same state as the first branch when you
# create a new, empty repository. Of course, it leaves all of your other
# branches the same and untouched.
#
set -e
USAGE="git-emtpy-branch <new-branch>"
if [ $# != 1 ]; then
echo "usage: $USAGE" >&2
exit 1
fi
# Thanks to 'set -e' above, this will exit with a useful error message if we are
# not in a git repository. Thus, there is no reason to check its output. Another
# 'set -e' win!
GITTOPLEVEL=`git rev-parse --show-toplevel`
cd $GITTOPLEVEL
git symbolic-ref HEAD refs/heads/$1
rm .git/index
git clean -fdxq
echo "You probably want to change directories to the top level now:"
echo $GITTOPLEVEL
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