Git worktree layout

git-worktrees.md

I use git worktrees a lot, and I’ve been annoyed by the repo itself having effectively a privileged worktree that’s always there (and refuses to let any other worktree check out the branch it’s on). And then not having a good place to put my other worktrees. If I clone to $PROJECTS/this-project, where do I put my worktrees?

• If I put them in the directory, the worktree directories are scattered among all the files in the clone’s working tree (and I seem to remember git having some issues with worktrees inside a working tree), but
• if I put them next to the directory, then the worktree names need to be prefixed with the repo name (and if there are repos foo and foo-charts, it’s easy to forget that foo-charts isn’t just a worktree of foo.

So, my projects tended to look like this:

$PROJECT_DIR
├── my-project                           # a repo
│   ├── .git
│   └── ...                              # but also a working tree
├── my-project-add-some-feature          # a worktree
│   └── ...
├── my-project-charts                    # a different repo, but with a worktree-looking name
│   ├── .git
│   └── ...                              # which also has its own working tree
├── my-project-charts-refactor-something # a worktree in the different repo
│   └── ...
└── my-project-fix-this-bug              # another worktree in the first repo
    └── ...

But now I have a new script for cloning a repo (abbreviated a bit here), which does this:

CLONE_DIR=$PROJECT_DIR/$REPO/repo
git clone $DOMAIN/$ORGANIZATION/$REPO $CLONE_DIR
cd $CLONE_DIR
git checkout $(git commit-tree $(git hash-object -t tree /dev/null) < /dev/null)

which is what I wish git clone --bare did, but doesn’t quite. Basically, you end up with a repo without a working tree. So there’s no branch locked by the repo, and no privileged working tree.

So then I end up with something like this:

$PROJECT_DIR
├── my-project
│   ├── add-some-feature  # a worktree
│   │   └── ...
│   ├── fix-this-bug      # another worktree
│   │   └── ...
│   └── repo              # the “bare” repo
│       └── .git          # the only thing in the “bare” repo
└── my-project-charts     # a different project with a worktree-looking name
    ├── refactor-something
    │   └── ...
    └── repo
        └── .git

It’s annoying to have that script for cloning, so I’ll probably try to get rid of it. But after the initial clone, I really like working like this.

FWIW, I now use a very different approach (managed by a tool of my own called astrolabe).

$HOME
├── .local/state/astrolabe/clones
│   ├── buge                         # bare repo
│   ├── duoids                       #     〃
│   ├── pathway                      #     〃
│   ├── yaya                         #     〃
│   └── ...
└── Projects
    ├── community                    # broad “organization”
    │   ├── fix-directory-operations # single task (~ branch name)
    │   │   ├── buge                 # worktree for primary project of the task
    │   │   ├── pathway              # worktree for dependency of buge that needs changes
    │   │   └── yaya                 #                    〃
    │   └── ...
    ├── personal                     # another “organization”
    │   └── ...                      # tasks for that organization
    └── Some Client                  # another “organization”
        └── ...                      # tasks for that organization

This still uses bare repos (actually --bare now), but shifts my development to be task-centric, rather that repo-centric.

The bare repos are all hidden away as Astrolabe’s internal state, and each task directory has worktrees that reference those bare repos.

This helps with a few things

1. the bare repos are effectively hidden away.
2. I like to partition my work by whom it’s for (like, a client)
3. but there are projects that I work on for multiple “organizations”, and my previous approach didn’t handle that well
4. this assists with my preferred style of poly-repo development. I can have small projects, but still work on them as one¹
5. when one task is done, all of the worktrees associated with it are cleaned up together, rather than scattered around.

Footnotes

1. Astrolabe does a bunch of stuff for me, like:

   • adding removing repos from a task;
   • letting me know which tasks are clean, or in what state;
   • cleaning up after finished tasks;
   • overriding dependencies so that all of the worktrees in a task depend on each other rather than their usual published dependencies, etc.; and
   • cleaning up bare repos that don’t have any worktrees or stashes.
   ↩