forked from mirrors/jj
249 lines
8.4 KiB
Markdown
249 lines
8.4 KiB
Markdown
# Using Jujutsu with GitHub and GitLab Projects
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This guide assumes a basic understanding of either Git or Mercurial.
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## Set up an SSH key
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As of December 2022 it's recommended to set up an SSH key to work with GitHub
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projects. See [GitHub's Tutorial][gh]. This restriction may be lifted in the
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future, see [issue #469][http-auth] for more information and progress on
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authenticated http.
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## Basic workflow
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The simplest way to start with Jujutsu is to create a stack of commits first.
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You will only need to create a branch when you need to push the stack to a
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remote. There are two primary workflows, using a generated branch name or
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naming a branch.
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### Using a generated branch name
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In this example we're letting Jujutsu auto-create a branch.
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```shell
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# Start a new commit off of the default branch.
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$ jj new main
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# Refactor some files, then add a description and start a new commit
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$ jj commit -m 'refactor(foo): restructure foo()'
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# Add a feature, then add a description and start a new commit
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$ jj commit -m 'feat(bar): add support for bar'
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# Let Jujutsu generate a branch name and push that to GitHub
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$ jj git push -c @-
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```
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### Using a named branch
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In this example, we create a branch named `bar` and then push it to the remote.
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```shell
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# Start a new commit off of the default branch.
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$ jj new main
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# Refactor some files, then add a description and start a new commit
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$ jj commit -m 'refactor(foo): restructure foo()'
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# Add a feature, then add a description and start a new commit
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$ jj commit -m 'feat(bar): add support for bar'
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# Create a branch so we can push it to GitHub
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$ jj branch create bar -r @- # create a branch `bar` that now contains the previous two commits.
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# Push the branch to GitHub (pushes only `bar`)
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$ jj git push
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```
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While it's possible to create a branch and commit on top of it in a Git-like
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manner, you will then need to move the branch manually when you create a new
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commits. Unlike Git, Jujutsu will not do it automatically .
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## Updating the repository.
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As of December 2022, Jujutsu has no equivalent to a `git pull` command. Until
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such a command is added, you need to use `jj git fetch` followed by a
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`jj rebase -d $main_branch` to update your changes.
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## Working in a Git co-located repository
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After doing `jj init --git-repo=.`, git will be in
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a [detached HEAD state][detached], which is unusual, as git mainly works with
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branches. In a co-located repository, `jj` isn't the source of truth. But
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Jujutsu allows an incremental migration, as `jj commit` updates the HEAD of the
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git repository.
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```shell
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$ nvim docs/tutorial.md
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$ # Do some more work.
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$ jj commit -m "Update tutorial"
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$ jj branch create doc-update
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$ # Move the previous revision to doc-update.
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$ jj branch set doc-update -r @-
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$ jj git push
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```
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## Working in a Jujutsu repository
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In a Jujutsu repository, the workflow is simplified. If there's no need for
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explicitly named branches, you just can generate one for a change. As Jujutsu is
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able to create a branch for a revision.
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```shell
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$ # Do your work
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$ jj commit
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$ # Push change "mw", letting Jujutsu automatically create a branch called "push-mwmpwkwknuz"
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$ jj git push --change mw
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```
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## Addressing review comments
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There are two workflows for addressing review comments, depending on your
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project's preference. Many projects prefer that you address comments by adding
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commits to your branch[^1]. Some projects (such as Jujutsu and LLVM) instead
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prefer that you keep your commits clean by rewriting them and then
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force-pushing[^2].
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### Adding new commits
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If your project prefers that you address review comments by adding commits on
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top, you can do that by doing something like this:
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```shell
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$ # Create a new commit on top of the `your-feature` branch from above.
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$ jj new your-feature
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$ # Address the comments, by updating the code
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$ jj diff
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$ # Give the fix a description and create a new working-copy on top.
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$ jj commit -m 'address pr comments'
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$ # Update the branch to point to the new commit.
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$ jj branch set your-feature -r @-
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$ # Push it to your remote
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$ jj git push
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```
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Notably, the above workflow creates a new commit for you. The same can be
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achieved without creating a new commit.
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> **Warning**
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> We strongly suggest to `jj new` after the example below, as all further edits
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> still get amended to the previous commit.
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```shell
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$ # Create a new commit on top of the `your-feature` branch from above.
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$ jj new your-feature
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$ # Address the comments, by updating the code
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$ jj diff
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$ # Give the fix a description.
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$ jj describe -m 'address pr comments'
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$ # Update the branch to point to the current commit.
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$ jj branch set your-feature -r @
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$ # Push it to your remote
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$ jj git push
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```
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### Rewriting commits
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If your project prefers that you keep commits clean, you can do that by doing
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something like this:
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```shell
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$ # Create a new commit on top of the second-to-last commit in `your-feature`,
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$ # as reviews requested a fix there.
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$ jj new your-feature- # NOTE: the trailing hyphen is not a typo!
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$ # Address the comments by updating the code
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$ # Review the changes
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$ jj diff
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$ # Squash the changes into the parent commit
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$ jj squash
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$ # Push the updated branch to the remote. Jujutsu automatically makes it a force push
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$ jj git push --branch your-feature
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```
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The hyphen after `your-feature` comes from [revset](https://github.com/martinvonz/jj/blob/main/docs/revsets.md) syntax.
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## Working with other people's branches
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By default `jj git clone` and `jj git fetch` clone all active branches from
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the remote. This means that if you want to iterate or test another
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contributor's branch you can `jj new <branchname>` onto it.
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If your remote has a large amount of old, inactive branches or this feature is
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undesirable, set `git.auto-local-branch = false` in the config file.
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You can find more information on that setting [here][auto-branch].
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## Using GitHub CLI
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GitHub CLI will have trouble finding the proper git repository path in jj repos
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that aren't [co-located](./git-compatibility.md#co-located-jujutsugit-repos)
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(see [issue #1008]). You can configure the `$GIT_DIR` environment variable to
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point it to the right path:
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```shell
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$ GIT_DIR=.jj/repo/store/git gh issue list
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```
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You can make that automatic by installing [direnv](https://direnv.net) and
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defining hooks in a .envrc file in the repository root to configure `$GIT_DIR`.
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Just add this line into .envrc:
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```shell
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export GIT_DIR=$PWD/.jj/repo/store/git
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```
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and run `direnv allow` to approve it for direnv to run. Then GitHub CLI will
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work automatically even in repos that aren't co-located so you can execute
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commands like `gh issue list` normally.
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[issue #1008]: https://github.com/martinvonz/jj/issues/1008
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## Useful Revsets
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Log all revisions across all local branches, which aren't on the main branch nor
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on any remote
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`jj log -r 'branches() & ~(main | remote_branches())'`
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Log all revisions which you authored, across all branches which aren't on any
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remote
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`jj log -r 'mine() & branches() & ~remote_branches()'`
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Log all remote branches, which you authored or committed to
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`jj log -r 'remote_branches() & (mine() | committer(your@email.com))'`
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Log all descendants of the current working copy, which aren't on a remote
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`jj log -r '::@ & ~remote_branches()'`
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## Merge conflicts
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For a detailed overview, how Jujutsu handles conflicts, revisit
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the [tutorial][tut].
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[^1]: This is a GitHub Style review, as GitHub currently only is able to compare
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branches.
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[^2]: If you're wondering why we prefer clean commits in this project, see
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e.g. [this blog post][stacked]
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[auto-branch]: config.md#automatic-local-branch-creation
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[detached]: https://git-scm.com/docs/git-checkout#_detached_head
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[gh]: https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent
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[http-auth]: https://github.com/martinvonz/jj/issues/469
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[tut]: tutorial.md#Conflicts
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[stacked]: https://jg.gg/2018/09/29/stacked-diffs-versus-pull-requests/
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## Using several remotes
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It is common to use several remotes when contributing to a shared repository.
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For example,
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"upstream" can designate the remote where the changes will be merged through a
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pull-request while "origin" is your private fork of the project. In this case,
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you might want to
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`jj git fetch` from "upstream" and to `jj git push` to "origin".
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You can configure the default remotes to fetch from and push to in your
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configuration file
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(for example `.jj/repo/config.toml`):
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```toml
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[git]
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fetch = "upstream"
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push = "origin"
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```
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The default for both `git.fetch` and `git.push` is "origin".
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