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docs: list supported and unsupported Git features

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Martin von Zweigbergk 2022-03-09 21:14:59 -08:00 committed by Martin von Zweigbergk
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docs/git-compatibility.md
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@ -9,7 +9,61 @@ See `jj help git` for help about the `jj git` family of commands, and e.g.
briefer help).
## Supported features
The following list describes which Git features Jujutsu is compatible with. For
a comparison with Git, including how workflows are different, see the
[Git-comparison doc](git-comparison.md).
* **Configuration: No.** The only configuration from Git (e.g. in
`~/.gitconfig`) that's respected is the configuration of remotes. Feel free
to file a bug if you miss any particular configuration options.
* **Authentication: Partial.** Only `ssh-agent` or a password-less key file at
`~/.ssh/id_rsa` (and only at exactly that path).
* **Branches: Yes.** You can read more about
[how branches work in Jujutsu](branches.md)
and [how they interoperate with Git](#branches).
* **Tags: Partial.** You can check out tagged commits by name (pointed to be
either annotated or lightweight tags), but you cannot create new tags.
* **.gitignore: Partial.** No support for ignores in `.git/info/exclude`
([#65](https://github.com/martinvonz/jj/issues/65)) or via `core.excludesfile`
config ([#87](https://github.com/martinvonz/jj/issues/87)). Also, it uses a
native implementation, so please report a bug if you notice any difference
compared to `git`.
* **.gitattributes: No.** There's [#53](https://github.com/martinvonz/jj/issues/53)
about adding support for at least the `eol` attribute.
* **Merge commits: Yes.** Octopus merges (i.e. with more than 2 parents) are
also supported.
* **Detached HEAD: Yes.** Jujutsu supports anonymous branches, so this is a
natural state.
* **Orphan branch: Yes.** Jujutsu has a virtual root commit that appears as
parent of all commits Git would call "root commits".
* **Staging area: Kind of.** The staging area will be ignored. For example,
`jj diff` will show a diff from the Git HEAD to the working copy. There are
[ways of fulfilling your usecases without a staging
area](https://github.com/martinvonz/jj/blob/main/docs/git-comparison.md#the-index).
* **Garbage collection: Yes.** It should be safe to run `git gc` in the Git
repo, but it's not tested, so it's probably a good idea to make a backup of
the whole workspace first. There's [no garbage collection and repacking of
Jujutsu's own data structures yet](https://github.com/martinvonz/jj/issues/12),
however.
* **Bare repositories: Yes.** You can use `jj init --git-repo=<path>` to create
a repo backed by a bare Git repo.
* **Submodules: No.** They will not show up in the working copy, but they will
not be lost either.
* **Partial clones: No.** We use the [libgit2](https://libgit2.org/) library,
which doesn't have support for partial clones.
* **git-worktree: No.** However, there's native support for multiple working
copies backed by a single repo. See the `jj workspace` family of commands.
* **Sparse checkouts: No.** There is
[#52](https://github.com/martinvonz/jj/issues/52) about native support for
sparse checkouts.
* **Signed commits: No.** ([#58](https://github.com/martinvonz/jj/issues/58))
* **Git LFS: No.** ([#80](https://github.com/martinvonz/jj/issues/80))
## Creating an empty repo
To create an empty repo using the Git backend, use `jj init --git <name>`. Since
the command creates a Jujutsu repo, it will have a `.jj/` directory. The
underlying Git repo will be inside of that directory (currently in