GitLab CI/CD for external repositories (PREMIUM)
GitLab CI/CD can be used with:
Instead of moving your entire project to GitLab, you can connect your external repository to get the benefits of GitLab CI/CD.
To connect to an external repository:
- On the top menu, select Projects > Create new project.
- Select Run CI/CD for external repository.
- Select GitHub or Repo by URL.
- Complete the fields.
Pipelines for external pull requests
Introduced in GitLab Premium 12.3.
When using GitLab CI/CD with an external repository on GitHub, it's possible to run a pipeline in the context of a Pull Request.
When you push changes to a remote branch in GitHub, GitLab CI/CD can run a pipeline for the branch. However, when you open or update a Pull Request for that branch you may want to:
- Run extra jobs.
- Not run specific jobs.
always-run: script: echo 'this should always run' on-pull-requests: script: echo 'this should run on pull requests' only: - external_pull_requests except-pull-requests: script: echo 'this should not run on pull requests' except: - external_pull_requests
How it works
When a repository is imported from GitHub, GitLab subscribes to webhooks
pull_request events. Once a
pull_request event is received,
the Pull Request data is stored and kept as a reference. If the Pull Request
has just been created, GitLab immediately creates a pipeline for the external
If changes are pushed to the branch referenced by the Pull Request and the Pull Request is still open, a pipeline for the external pull request is created.
GitLab CI/CD creates 2 pipelines in this case. One for the branch push and one for the external pull request.
After the Pull Request is closed, no pipelines are created for the external pull request, even if new changes are pushed to the same branch.
Additional predefined variables
By using pipelines for external pull requests, GitLab exposes additional predefined variables to the pipeline jobs.
The variable names are prefixed with
This feature currently does not support Pull Requests from fork repositories. Any Pull Requests from fork repositories are ignored. Read more.
Given that GitLab creates 2 pipelines, if changes are pushed to a remote branch that
references an open Pull Request, both contribute to the status of the Pull Request
via GitHub integration. If you want to exclusively run pipelines on external pull
requests and not on branches you can add
except: [branches] to the job specs.