| # Contribute changes |
| |
| This guide provides instructions on how to submit your contribution to the |
| Fuchsia project. |
| |
| ## Prerequisites |
| |
| Fuchsia manages git commits and code reviews through |
| [Gerrit's](https://fuchsia-review.googlesource.com){:.external} web UI. |
| |
| Before you begin, you need to: |
| |
| * [Download the Fuchsia source code](/docs/get-started/get_fuchsia_source.md). |
| |
| Note: You can complete the next prerequisite items while downloading the |
| Fuchsia source code. |
| |
| * [Sign the Google Contributor License Agreements (CLA)](#sign-the-google-cla). |
| |
| * [Generate a cookie to authenticate you in Gerrit](#generate-a-cookie). |
| |
| ### Sign the Google CLA {#sign-the-google-cla} |
| |
| Do the following: |
| |
| 1. Go to the Google Developers' |
| [Contributor License Agreements](https://cla.developers.google.com/){:.external} |
| page. |
| 1. Sign the agreement on behalf of **Only Yourself** or **Your Employer**. |
| |
| ### Generate a cookie {#generate-a-cookie} |
| |
| Do the following: |
| |
| 1. Log into [Gerrit](https://fuchsia-review.googlesource.com){:.external}. |
| 1. Go to |
| [https://fuchsia.googlesource.com](https://fuchsia.googlesource.com){:.external}. |
| 1. At the top of the page, click **Generate Password**. |
| 1. Copy the generated code and run it in a terminal of your workstation. |
| |
| ## Create a change in Gerrit {#create-a-change-in-gerrit} |
| |
| The Fuchsia project uses Gerrit's web-based UI to manage code and |
| documentation reviews. When a commit is uploaded to Gerrit, it is referred to as |
| as a **change**. |
| |
| To create a |
| [change](https://gerrit-review.googlesource.com/Documentation/concept-changes.html){:.external} |
| in Gerrit, do the following: |
| |
| 1. Go to your Fuchsia directory, for example: |
| |
| ```posix-terminal |
| cd ~/fuchsia |
| ``` |
| |
| 1. Create a new branch: |
| |
| ```posix-terminal |
| git checkout -b <branch_name> |
| ``` |
| |
| 1. Create or edit files in the new branch. |
| |
| 1. Add the updated files: |
| |
| ```posix-terminal |
| git add <files> |
| ``` |
| |
| 1. Commit the updated files and |
| [write the change message](/docs/contribute/commit-message-style-guide.md): |
| |
| ```posix-terminal |
| git commit |
| ``` |
| |
| 1. Upload the commit to Gerrit: |
| |
| You can use `jiri` or `git`. |
| |
| `jiri` is a tool for working with multiple repositories that is [installed with Fuchsia](/docs/get-started/get_fuchsia_source.md). |
| To upload your commit: |
| |
| ```posix-terminal |
| jiri upload |
| ``` |
| |
| See also the [Jiri documentation](https://fuchsia.googlesource.com/jiri/+/HEAD/README.md) for more information. |
| |
| If you want to use the `git` command instead, run the following command: |
| |
| ```posix-terminal |
| git push origin HEAD:refs/for/main |
| ``` |
| |
| See the |
| [Gerrit documentation](https://gerrit-documentation.storage.googleapis.com/Documentation/2.12.3/intro-user.html#upload-change){:.external} |
| for more information. |
| |
| ### Request a code review |
| |
| After creating a change, to request a code review, do the following: |
| |
| 1. Go to your [Fuchsia Gerrit dashboard](https://fuchsia-review.googlesource.com/dashboard/self). |
| 1. Click your change, which appears in the *Outgoing reviews* section. |
| 1. Click **ADD REVIEWER**. |
| 1. Add reviewers by email address. You can refer to the `OWNERS` file, located in the directory |
| where you're making your change or in one of its parents to find the best reviewers for your change. |
| 1. Click **SEND**. |
| |
| #### Track your review |
| |
| To track the progress of your code review, use |
| [Gerrit](https://fuchsia-review.googlesource.com){:.external}. For more |
| information on how to use the Gerrit code review tool, see |
| [Review UI documentation](https://gerrit-review.googlesource.com/Documentation/user-review-ui.html){:.external}. |
| |
| After you request a code review for your change, reviewers can score |
| your change. Reviewers can label your change with a |
| score of **-2**, **-1**, **0**, **+1**, or **+2**. For more information on |
| review label definitions see, [Gerrit Code Review - Review Labels](https://gerrit-review.googlesource.com/Documentation/config-labels.html){:.external}. |
| |
| In order for your change to be submitted, you need a **Code Review Label +2**. |
| A **Code Review Label +2** score can only be applied by a directory owner. |
| |
| #### Submit your change {#submit-a-change} |
| |
| A change can be submitted after a repository owner applies the |
| **Code Review Label +2** to your change. When a change is submitted, the change |
| is submitted to the Commit Queue (CQ). The Commit Queue verifies and |
| merges changes to the `main` branch. |
| |
| **Only contributors with [commit access](/docs/contribute/community/contributor-roles.md#committer)** can submit code directly |
| through the Gerrit interface. Regular members need to ask a Committer to submit code for them. |
| |
| ### Create and upload a patch |
| |
| After creating a change, to upload a patch to your change, do the following: |
| |
| 1. Create or edit files in the same branch. |
| 1. Add the updated files: |
| |
| ```posix-terminal |
| git add <files> |
| ``` |
| |
| 1. Include the patch in the same commit using the `--amend` option: |
| |
| ```posix-terminal |
| git commit --amend |
| ``` |
| |
| 1. Upload the patch to Gerrit: |
| |
| ```posix-terminal |
| jiri upload |
| ``` |
| |
| ### Resolve merge conflicts {#resolve-merge-conflicts} |
| |
| When Gerrit warns you of merge conflicts in your change, do the following: |
| |
| 1. Rebase from `origin/main`, which reveals the files that cause merge |
| conflicts: |
| |
| ```posix-terminal |
| git rebase origin/main |
| ``` |
| |
| 1. Edit those files to resolve the conflicts and finish the rebase: |
| |
| ```posix-terminal |
| git add <files_with_resolved_conflicts> |
| ``` |
| |
| ```posix-terminal |
| git rebase --continue |
| ``` |
| |
| 1. Upload the patch to your change: |
| |
| ```posix-terminal |
| git commit --amend |
| ``` |
| |
| ```posix-terminal |
| jiri upload |
| ``` |
| |
| ### Delete your local branch |
| |
| After the change is submitted, you may delete your local branch: |
| |
| ```posix-terminal |
| git branch -d <branch_name> |
| ``` |
| |
| ## Write a change message {#write-a-change-message} |
| |
| When writing a change message, follow the [Commit message style |
| guide](/docs/contribute/commit-message-style-guide.md). |
| |
| ## Contribute a change to the API |
| |
| To contribute to the |
| [Fuchsia API Surface](/docs/glossary/README.md#fuchsia-api-surface), do the following: |
| |
| * Evaluate whether your change is large or small. |
| |
| * If you have a small, incremental change to the API, contribute your |
| change by completing the steps in |
| [create a change in Gerrit](#create-a-change-in-gerrit), as you would for |
| any Fuchsia source code change. |
| * If you have a large change to the API, that is, a change that |
| significantly expands on the fuction of the API or modifies the |
| API extensively, do the following: |
| * Create an [RFC](/docs/contribute/governance/rfcs/TEMPLATE.md) that |
| explains the design of your modification to the API. |
| * This RFC should be reviewed through the normal [RFC |
| process](/docs/contribute/governance/rfcs/rfc_process.md). The API |
| reviewer for the relevant area should be a stakeholder in the RFC. See |
| the [Fuchsia API Council |
| Charter](/docs/contribute/governance/api_council.md#area) to identify |
| API reviewers. |
| * After your API RFC is approved, contribute your change by |
| completing the steps in |
| [create a change in Gerrit](#create-a-change-in-gerrit), as you would |
| for any Fuchsia source code change. |
| |
| * [Request a code review](#request_a_code_review) from an API council |
| member. Select your API council reviewer based on the area of the |
| Fuchsia API that you're modifying. For a list of API council members and their |
| areas of focus, see |
| [Membership](/docs/contribute/governance/api_council.md#membership) in the |
| Fuchsia API Council Charter. |
| |
| ## Manage changes that span multiple repositories |
| |
| To understand how to manage changes that span different repositories (petals), |
| see the following pages: |
| |
| * [Working across different petals](/docs/development/source_code/working_across_petals.md) |
| * [Upload changes from multiple repositories](/docs/development/source_code/upload_changes_from_multiple_repositories.md) |
| |
| See [Source code layout](/docs/development/source_code/layout.md) for more |
| information on the structure of the Fuchsia repository. |