GitLab no longer supports pull mirroring

[christophwitzko]

Until recently, we used https://gitlab.com/go-semantic-release/semantic-release as a mirror for the semantic-release project to test the GitLab integration. On 13-09-2022, GitLab moved this functionality to the Premium tier, and therefore, we need another solution to test our integration. (see https://docs.gitlab.com/ee/user/project/repository/mirror/pull.html)

[superewald]

Not entirely sure about this but it would be my approach (untested as of now):

1. create a ci job in gitlab which simply pushes all tags and branches from github to gitlab ("raw mirroring") and is only executed on pipeline triggers:

   # gitlab ci job which mirrors the repository on github webhook event
   mirror_repository:
   only:
   - triggers # only run this job on pipeline triggers
   # can add additional rules to check for a specific variable set from pipeline trigger webhook
   before_script:
   # setup ssh/git to be able to push to this repository
   script:
   - git clone https://github.com/go-semantic-release/semantic-release gh-mirror
   - cd gh-mirror
   - git remote remove origin
   - git remote add origin https://gitlab.com/go-semantic-release/semantic-release
   - git push --prune --all
   - git push --prune --tags

2. create a GitLab Pipeline Trigger in the gitlab project
3. create a GitHub Webhook for push/merge events which calls the Pipeline Trigger above

I never used GitHub Webhooks so I'm not sure about the last step but from what I read it should work. Got the basic idea from a medium article

[superewald]

I did a simple PoC repository which shows the workflow is working:

• https://github.com/superewald/gitlab-repo-mirror
• https://gitlab.com/superewald/gitlab-repo-mirror

Using pipeline trigger variables and the webhook this can be customized to your desire. If you need help setting this up or have any questions feel free to ask.

[christophwitzko]

Hey @superewald, thank you so much for looking into this. 👍 I think I will add a push-based approach to GitHub Actions because GitHub is the main development platform.