#!/usr/bin/env bash
# Copyright 2019 PingCAP, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# See the License for the specific language governing permissions and
# limitations under the License.

# This script is used to checkout a TiDB PR branch in a forked repo.
if test -z $1; then
	echo -e "Usage:\n"
	echo -e "\tcheckout-pr-branch.sh [github-username]:[pr-branch]\n"
	echo -e "The argument can be copied directly from github PR page."
	echo -e "The local branch name would be [github-username]/[pr-branch]."
	exit 0;
fi

username=$(echo $1 | cut -d':' -f1)
branch=$(echo $1 | cut -d':' -f2)
local_branch=$username/$branch
fork="https://github.com/$username/tidb"

exists=`git show-ref refs/heads/$local_branch`
if [ -n "$exists" ]; then
	git checkout $local_branch
	git pull $fork $branch:$local_branch
else
	git fetch $fork $branch:$local_branch
	git checkout $local_branch
fi