git-clonefork

#!/usr/bin/env bash

# Copyright 2023 Calum Murray
#
# 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,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

GIT_ORIGIN=$1
REPO_DIRECTORY=$(basename $GIT_ORIGIN .git)
GITHUB_API_URL=$(echo $GIT_ORIGIN | sed -r 's/.*(\@|\/\/)(.*)(\:|\/)([^:\/]*)\/([^\/\.]*)\.git/https:\/\/api.github.com\/repos\/\4\/\5/')
if grep -Eiq "^https?://" <<<$GIT_ORIGIN; then
	UPSTREAM_ORIGIN=$(curl -s $GITHUB_API_URL | jq -r .parent.clone_url)
else
	UPSTREAM_ORIGIN=$(curl -s $GITHUB_API_URL | jq -r .parent.ssh_url)
fi
git clone $GIT_ORIGIN
cd $REPO_DIRECTORY
git remote add upstream $UPSTREAM_ORIGIN
git remote set-url --push upstream no_push