Ever wanted to have multiple git branches checked out at the same time? Say we need to pause our work in one branch and hop over to another, there’s that extra overhead needed to stash unstaged changes or make a WIP commit. It would be faster if we could just drop everything and cd straight to the branch of interest. The underutilised git worktree command makes this sort of workflow possible!

Like other aspects of git, it’s a bit rough around the edges at times. Understanding a bit more about the inner workings of git help makes it feel a bit less fiddly. Here we’ll discuss in a bit more detail how to setup this workflow, and some of the caveats I’ve come across.

Getting started

First let’s set-up our projects directory (I tend to use ~/Workspace/repos)

$ mkdir -p Workspace/repos
$ cd Workspace/repos

Lets create a top-level directory for the project https://github.com/username/project-name and clone the bare repository information into a .git directory

$ git clone --bare git@github.com/user/project-name project-name/.git
$ cd project-name
$ ls -a
# .  ..  .git

Now we’re ready to use worktrees! Lets clone main first:

$ git worktree add main
$ ls -a
# .  ..  .git  main
$ cd main

All of the content in the main branch is present in ~/Workspace/repos/project-name/main now. Aside from the extra directories we haven’t done much more than a regular clone. Let’s create a new branch and check it out into its own worktree:

$ cd ..  # Back to ~/Workspace/repos/project-name
$ git worktree add new-branch
$ ls -a
# .  ..  .git  main  new-branch
$ cd new-branch

A new branch is created and present in ~/Workspace/repos/project-name/branch-name. We can cd there, make some commits and push them like any other branch.

This has been a pretty useful workflow with my projects. Often I’ll create a worktree for a new feature for a project, then I’ll be notified halfway though that a bugfix needs to be made. No worries, no need to dance about with stash/checkout. All I need to do is

$ cd ..  # Back to ~/Workspace/repos/project-name
$ git worktree add fix-urgent-bug
$ cd fix-urgent-bug

And I’m able to come back to the branch-name directory whenever without worry about losing my state of work. On top of that, I can manage separate environments for these worktrees and ensure that I’m only testing the code I want. I could even open another terminal and test multiple branches side by side. Lovely!

Once the branch is pushed, reviewd and merged, I have no use for this branch anymore, so let’s remove it

$ cd ..  # Back to ~/Workspace/repos/project-name
$ git worktree remove fix-urgent-bug
$ ls -a
# .  ..  .git  main  new-branch

Reviewing

This workflow seems great for code review as well! However this bumps up against a point of friction with bare git repositories: they cannot fetch new branches from origin by default. Thankfully I’m not the only one in this predicatment, and found an excellent write-up and explanation of why this is the case and how to fix it here.

$ cd ..  # Back to ~/Workspace/repos/project-name
$ git config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*"
$ git fetch

Say there’s a new branch cool-feature that I need to review and test. Now we can use the power of worktrees to check it out into it’s own directory

$ git fetch  # Get latest branches
$ git worktree add --guess-remote cool-feature
$ ls -a
# .  ..  .git  main  new-branch  cool-feature
$ cd cool-feature

We can confirm that this worktree is up-to-date with git log, and any new commits can be git pulled when we’re in that directory!

Alias

As helpfully suggested in the linked article, we can pull all of these commands together into a script and then create a git alias.

In ~/.git-clonetree.sh:

#!/usr/bin/env bash

url=$1
base=$(basename ${url})
dir=${2:-${base%.*}}

git clone --bare ${url} ${dir}/.git
cd ${dir}
git config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*"
git fetch origin

primebranch=$(git symbolic-ref --short HEAD)
git worktree add ${primebranch}

Putting this into an alias in ~/.gitconfig:

[alias]
    clonetree = !sh $HOME/.git-clonetree.sh