Merge requests workflow

We welcome merge requests from everyone, with fixes and improvements to GitLab code, tests, and documentation. The issues that are specifically suitable for community contributions are listed with the Accepting merge requests label, but you are free to contribute to any issue you want.

Please note that if an issue is marked for the current milestone at any time, even when you are working on it, a GitLab Inc. team member may take over the merge request in order to ensure the work is finished before the release date.

If you want to add a new feature that is not labeled, it is best to first create an issue (if there isn't one already) and leave a comment asking for it to be marked as Accepting Merge Requests. Please include screenshots or wireframes of the proposed feature if it will also change the UI.

Merge requests should be submitted to the appropriate project at GitLab.com, for example GitLab CE, GitLab EE, GitLab Runner, GitLab Omnibus, etc.

If you are new to GitLab development (or web development in general), see the I want to contribute! section to get started with some potentially easy issues.

To start developing GitLab, download the GitLab Development Kit and see the Development section for the required guidelines.

Merge request guidelines

If you find an issue, please submit a merge request with a fix or improvement, if you can, and include tests. If you don't know how to fix the issue but can write a test that exposes the issue, we will accept that as well. In general, bug fixes that include a regression test are merged quickly, while new features without proper tests might be slower to receive feedback. The workflow to make a merge request is as follows:

Fork the project into your personal namespace (or group) on GitLab.com.
Create a feature branch in your fork (don't work off master).
Write tests and code.
Generate a changelog entry with bin/changelog
If you are writing documentation, make sure to follow the documentation guidelines.
Follow the commit messages guidelines.
If you have multiple commits, combine them into a few logically organized commits by squashing them, but do not change the commit history if you're working on shared branches though.
Push the commit(s) to your working branch in your fork.
Submit a merge request (MR) to the master branch in the main GitLab project.
1. Your merge request needs at least 1 approval, but feel free to require more. For instance if you're touching both backend and frontend code, it's a good idea to require 2 approvals: 1 from a backend maintainer and 1 from a frontend maintainer.
2. If you're submitting changes to documentation, you'll need approval from a technical writer, based on the appropriate product category. Only assign the MR to them when it's ready for docs review.
3. You don't have to select any specific approvers, but you can if you really want specific people to approve your merge request.
The MR title should describe the change you want to make.
The MR description should give a reason for your change.
1. If you are contributing code, fill in the description according to the default template already provided in the "Description" field.
2. If you are contributing documentation, choose Documentation from the "Choose a template" menu and fill in the description according to the template.
3. Mention the issue(s) your merge request solves, using the Solves #XXX or Closes #XXX syntax to auto-close the issue(s) once the merge request is merged.
If you're allowed to (Core team members, for example), set a relevant milestone and labels.
If the MR changes the UI, you'll need approval from a Product Designer (UX), based on the appropriate product category. UI changes should use available components from the GitLab Design System, Pajamas. The MR must include Before and After screenshots.
If the MR changes CSS classes, please include the list of affected pages, which can be found by running grep css-class ./app -R.
Be prepared to answer questions and incorporate feedback into your MR with new commits. Once you have fully addressed a suggestion from a reviewer, click the "Resolve thread" button beneath it to mark it resolved.
1. The merge request author resolves only the threads they have fully addressed. If there's an open reply or thread, a suggestion, a question, or anything else, the thread should be left to be resolved by the reviewer.
If your MR touches code that executes shell commands, reads or opens files, or handles paths to files on disk, make sure it adheres to the shell command guidelines
If your code creates new files on disk please read the shared files guidelines.
If your merge request adds one or more migrations, make sure to execute all migrations on a fresh database before the MR is reviewed. If the review leads to large changes in the MR, execute the migrations again once the review is complete.
Write tests for more complex migrations.
Merge requests must adhere to the merge request performance guidelines.
For tests that use Capybara, read how to write reliable, asynchronous integration tests.
If your merge request introduces changes that require additional steps when installing GitLab from source, add them to doc/install/installation.md in the same merge request.
If your merge request introduces changes that require additional steps when upgrading GitLab from source, add them to doc/update/upgrading_from_source.md in the same merge request. If these instructions are specific to a version, add them to the "Version specific upgrading instructions" section.

If you would like quick feedback on your merge request feel free to mention someone from the core team or one of the merge request coaches. When having your code reviewed and when reviewing merge requests, please keep the code review guidelines in mind. And if your code also makes changes to the database, or does expensive queries, check the database review guidelines.

Keep it simple

Live by smaller iterations. Please keep the amount of changes in a single MR as small as possible. If you want to contribute a large feature, think very carefully about what the minimum viable change is. Can you split the functionality into two smaller MRs? Can you submit only the backend/API code? Can you start with a very simple UI? Can you do just a part of the refactor?

Small MRs which are more easily reviewed, lead to higher code quality which is more important to GitLab than having a minimal commit log. The smaller an MR is, the more likely it will be merged quickly. After that you can send more MRs to enhance and expand the feature. The How to get faster PR reviews document from the Kubernetes team also has some great points regarding this.

Commit messages guidelines

When writing commit messages, please follow the guidelines below:

The commit subject must contain at least 3 words.
The commit subject should ideally contain up to 50 characters, and must not be longer than 72 characters.
The commit subject must start with a capital letter.
The commit subject must not end with a period.
The commit subject and body must be separated by a blank line.
The commit body must not contain more than 72 characters per line.
Commits that change 30 or more lines across at least 3 files must describe these changes in the commit body.
The commit subject or body must not contain Emojis.
Use issues and merge requests' full URLs instead of short references, as they are displayed as plain text outside of GitLab.
The merge request must not contain more than 10 commit messages.

If the guidelines are not met, the MR will not pass the Danger checks. For more information see How to Write a Git Commit Message.

Example commit message template that can be used on your machine that embodies the above (guide for how to apply template):

# (If applied, this commit will...) <subject> (Max 50 char)
# |<----  Using a Maximum Of 50 Characters  ---->|


# Explain why this change is being made
# |<----   Try To Limit Each Line to a Maximum Of 72 Characters   ---->|

# Provide links or keys to any relevant tickets, articles or other resources
# Use issues and merge requests' full URLs instead of short references,
# as they are displayed as plain text outside of GitLab

# --- COMMIT END ---
# --------------------
# Remember to
#    Capitalize the subject line
#    Use the imperative mood in the subject line
#    Do not end the subject line with a period
#    Subject must contain at least 3 words
#    Separate subject from body with a blank line
#    Commits that change 30 or more lines across at least 3 files must
#    describe these changes in the commit body
#    Do not use Emojis
#    Use the body to explain what and why vs. how
#    Can use multiple lines with "-" for bullet points in body
#    For more information: https://chris.beams.io/posts/git-commit/
# --------------------

Contribution acceptance criteria

To make sure that your merge request can be approved, please ensure that it meets the contribution acceptance criteria below:

The change is as small as possible.
Include proper tests and make all tests pass (unless it contains a test exposing a bug in existing code). Every new class should have corresponding unit tests, even if the class is exercised at a higher level, such as a feature test.
- If a failing CI build seems to be unrelated to your contribution, you can try restarting the failing CI job, rebasing from master to bring in updates that may resolve the failure, or if it has not been fixed yet, ask a developer to help you fix the test.
The MR initially contains a few logically organized commits.
The changes can merge without problems. If not, you should rebase if you're the only one working on your feature branch, otherwise merge master.
Only one specific issue is fixed or one specific feature is implemented. Do not combine things; send separate merge requests for each issue or feature.
Migrations should do only one thing (e.g., create a table, move data to a new table, or remove an old table) to aid retrying on failure.
Contains functionality that other users will benefit from.
Doesn't add configuration options or settings options since they complicate making and testing future changes.
Changes do not degrade performance:
- Avoid repeated polling of endpoints that require a significant amount of overhead.
- Check for N+1 queries via the SQL log or QueryRecorder.
- Avoid repeated access of the filesystem.
- Use polling with ETag caching if needed to support real-time features.
If the merge request adds any new libraries (gems, JavaScript libraries, etc.), they should conform to our Licensing guidelines. See those instructions for help if the "license-finder" test fails with a Dependencies that need approval error. Also, make the reviewer aware of the new library and explain why you need it.
The merge request meets GitLab's definition of done, below.

Definition of done

If you contribute to GitLab please know that changes involve more than just code. We use the following definition of done. Your contribution is not done until you have made sure it meets all of these requirements.

Clear description explaining the relevancy of the contribution.
Working and clean code that is commented where needed.
Unit, integration, and system tests that all pass on the CI server.
Regressions and bugs are covered with tests that reduce the risk of the issue happening again.
Performance guidelines have been followed.
Documented in the /doc directory.
Changelog entry added, if necessary.
Reviewed by relevant (UX/FE/BE/tech writing) reviewers and all concerns are addressed.
Merged by a project maintainer.
Confirmed to be working in the Canary stage or on GitLab.com once the contribution is deployed.
Added to the release post, if relevant.
Added to the website, if relevant.
Black-box tests/end-to-end tests added if required. Please contact the quality team with any questions.

Dependencies

If you add a dependency in GitLab (such as an operating system package) please consider updating the following, and note the applicability of each in your merge request:

Note the addition in the release blog post (create one if it doesn't exist yet).
The upgrade guide.
The GitLab Installation Guide.
The GitLab Development Kit.
The CI environment preparation.
The Omnibus package creator.

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