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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 allows for 'clones' of repositories but only specifying some
# remote branches to clone. This is useful with repositories that have many
# branches with very different overlap so that cloning all branches is very
# expensive. For example, if you have a giant code project in branch 'foo', but
# only want to work on the TeX files in the 'paper' branch, this might be a good
# option.
set -e
USAGE="git-clone-branches [-t track branch]... [-b checkout branch] [-r remote name] <repository> <directory>"
BRANCHES=""
CHECKOUT=""
REMOTENAME="origin"
while getopts ":ht:b:r:" opt; do
case $opt in
h)
echo "usage: $USAGE"
echo ""
echo "git-clone-branches allows a user to clone only a subset of branches from a"
echo "repository. If no branches are specified, defaults to 'master'. If no "
echo "checkout branch is specified, the first listed branch is checked out."
echo ""
echo "-h shows this help message"
echo "-t <branch name> specifies a remote branch to clone"
echo "-b <branch name> specifies a branch to checkout after partial clone"
echo "-r <remote name> name to give remote (default is 'origin')"
exit 0
;;
t)
BRANCHES="$BRANCHES -t $OPTARG"
# if no checkout branch has been specified yet, use this branch as
# it must be the first remote branch specified.
if [ ! $CHECKOUT ]; then
CHECKOUT="$OPTARG"
fi
;;
b)
CHECKOUT="$OPTARG"
;;
r)
REMOTENAME="$OPTARG"
;;
:)
echo "option -$OPTARG requires an argument" >&2
echo "usage: $USAGE" >&2
exit 1
;;
\?)
echo "unknown option: -$OPTARG" >&2
echo "usage: $USAGE" >&2
exit 1
;;
esac
done
# If no branches are specified, default to master branch.
if [ ! "$BRANCHES" ]; then
BRANCHES="-t master"
# If no checkout branch has been specified, then it should also be set to
# master.
if [ ! $CHECKOUT ]; then
CHECKOUT="master"
fi
fi
# Shift the arguments past all of the options
shift $(($OPTIND - 1))
# Make sure that there are the correct number of non-option arguments.
if [ $# != 2 ]; then
echo "You must provide a repository to clone and a directory to clone to." >&2
echo "" >&2
echo "usage: $USAGE" >&2
exit 1
fi
REPO=$1
DIR=$2
# Create the requested directory if it doesn't exist.
if [ ! -e $DIR ]; then
mkdir $DIR
fi
# Enter the directory to begin clone. Thanks to 'set -e' magic, this should give
# a useful message if DIR is not a directory.
cd $DIR
git init -q
git remote add -f $REMOTENAME $BRANCHES $REPO
git checkout $CHECKOUT
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