# Get Zulip code Zulip uses a **forked-repo** and **[rebase][gitbook-rebase]-oriented workflow.**. This means that all contributors create a fork of the [Zulip repository][github-zulip] they want to contribute to and then submit pull requests to the upstream repository to have their contributions reviewed and accepted. We also recommend you work on feature branches. ## Step 1a: Create your fork The following steps you'll only need to do the first time you setup a machine for contributing to a given Zulip project. You'll need to repeat the steps for any additional Zulip projects ([list][github-zulip]) that you work on. The first thing you'll want to do to contribute to Zulip is fork ([see how][github-help-fork]) the appropriate [Zulip repository][github-zulip]. For the main server app, this is [zulip/zulip][github-zulip-zulip]. ## Step 1b: Clone to your machine Next, clone your fork to your local machine: ``` $ git clone --config pull.rebase https://github.com/YOUR_USERNAME/zulip.git Cloning into 'zulip' remote: Counting objects: 86768, done. remote: Compressing objects: 100% (15/15), done. remote: Total 86768 (delta 5), reused 1 (delta 1), pack-reused 86752 Receiving objects: 100% (86768/86768), 112.96 MiB | 523.00 KiB/s, done. Resolving deltas: 100% (61106/61106), done. Checking connectivity... done. ``` (The `--config pull.rebase` option configures Git so that `git pull` will behave like `git pull --rebase` by default. Using `git pull --rebase` to update your changes to resolve merge conflicts is expected by essentially all of open source projects, including Zulip. You can also set that option after cloning using `git config --add pull.rebase true`, or just be careful to always run `git pull --rebase`, never `git pull`). Note: If you receive an error while cloning, you may not have [added your ssh key to GitHub][github-help-add-ssh-key]. Once the repository is cloned, we recommend running [setup-git-repo][zulip-rtd-tools-setup] to install Zulip's pre-commit hook which runs the Zulip linters on the changed files when you commit. ## Step 1c: Connect your fork to Zulip upstream Next you'll want to [configure an upstream remote repository][github-help-conf-remote] for your fork of Zulip. This will allow you to [sync changes][github-help-sync-fork] from the main project back into your fork. First, show the currently configured remote repository: ``` $ git remote -v origin git@github.com:YOUR_USERNAME/zulip.git (fetch) origin git@github.com:YOUR_USERNAME/zulip.git (push) ``` Note: If you've cloned the repository using a graphical client, you may already have the upstream remote repository configured. For example, when you clone [zulip/zulip][github-zulip-zulip] with the GitHub desktop client it configures the remote repository `zulip` and you see the following output from `git remote -v`: ``` origin git@github.com:YOUR_USERNAME/zulip.git (fetch) origin git@github.com:YOUR_USERNAME/zulip.git (push) zulip https://github.com/zulip/zulip.git (fetch) zulip https://github.com/zulip/zulip.git (push) ``` If your client hasn't automatically configured a remote for zulip/zulip, you'll need to with: ``` $ git remote add -f upstream https://github.com/zulip/zulip.git ``` Finally, confirm that the new remote repository, upstream, has been configured: ``` $ git remote -v origin git@github.com:YOUR_USERNAME/zulip.git (fetch) origin git@github.com:YOUR_USERNAME/zulip.git (push) upstream https://github.com/zulip/zulip.git (fetch) upstream https://github.com/zulip/zulip.git (push) ``` ## Step 2: Set up the Zulip development environment If you haven't already, now is a good time to install the Zulip development environment ([overview][zulip-rtd-dev-overview]). If you're new to working on Zulip or open source projects in general, we recommend following our [detailed guide for first-time contributors][zulip-rtd-dev-first-time]. ## Step 3: Configure continuous integration for your fork This step is optional, but recommended. The Zulip Server project is configured to use [CircleCI][circle-ci] to test and create builds upon each new commit and pull request. CircleCI is the primary CI that runs frontend and backend tests across a wide range of Ubuntu distributions. CircleCI is free for open source projects and it's easy to configure for your own fork of Zulip. After doing so, CircleCI will run tests for new refs you push to GitHub and email you the outcome (you can also view the results in the web interface). Running CI against your fork can help save both your and the Zulip maintainers time by making it easy to test a change fully before submitting a pull request. We generally recommend a workflow where as you make changes, you use a fast edit-refresh cycle running individual tests locally until your changes work. But then once you've gotten the tests you'd expect to be relevant to your changes working, push a branch to run the full test suite in CircleCI before you create a pull request. While you wait for CircleCI jobs to run, you can start working on your next task. When the tests finish, you can create a pull request that you already know passes the tests. ### Setup CircleCI First, sign in to [CircleCI][circle-ci] with your GitHub account and authorize CircleCI to access your GitHub account and repositories. Once you've logged in you'll be in the **Projects** section which will list all your GitHub repositories. Now goto the row of Zulip and click on **Set Up Project**. You'll then see a sample hello world config. As your forked repository from Zulip will already have the config file, so click on **Start Building** and then choose the **Add Manually** option. After that click on **Start Building** to run the build. ![Screencast of CircleCI setup](../images/zulip-circleci.gif) [gitbook-rebase]: https://git-scm.com/book/en/v2/Git-Branching-Rebasing [github-help-add-ssh-key]: https://help.github.com/en/articles/adding-a-new-ssh-key-to-your-github-account [github-help-conf-remote]: https://help.github.com/en/articles/configuring-a-remote-for-a-fork [github-help-fork]: https://help.github.com/en/articles/fork-a-repo [github-help-sync-fork]: https://help.github.com/en/articles/syncing-a-fork [github-zulip]: https://github.com/zulip/ [github-zulip-zulip]: https://github.com/zulip/zulip/ [circle-ci]:https://circleci.com/ [zulip-rtd-dev-first-time]: ../development/setup-vagrant.md [zulip-rtd-dev-overview]: ../development/overview.md [zulip-rtd-tools-setup]: ../git/zulip-tools.html#set-up-git-repo-script