git-clone-worktrees.sh

#!/usr/bin/env bash
set -e

# Examples of call:
# git-clone-bare-for-worktrees git@github.com:name/repo.git
# => Clones to a /repo directory
#
# git-clone-bare-for-worktrees git@github.com:name/repo.git my-repo
# => Clones to a /my-repo directory

url=$1
basename=${url##*/}
name=${2:-${basename%.*}}

if [ -z "$url" ]; then
    echo "Usage: git-clone-bare-for-worktrees.sh <url> [<name>]"
    exit 1
fi
if [ -d "$name" ]; then
    echo "Directory $name already exists"
    exit 1
fi
if [ -z "$name" ]; then
    echo "Name is required"
    exit 1
fi


mkdir $name
cd "$name"

# Moves all the administrative git files (a.k.a $GIT_DIR) under .bare directory.
#
# Plan is to create worktrees as siblings of this directory.
# Example targeted structure:
# .bare
# main
# new-awesome-feature
# hotfix-bug-12
# ...
git clone --bare "$url" .bare
echo "gitdir: ./.bare" > .git

# Explicitly sets the remote origin fetch so we can fetch remote branches
git config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*"

# Gets all branches from origin
git fetch origin