I'm trying to learn about merge requests and in particular how those work in GitLab.
Given a project MAIN by user USER_MAIN (role: Maintainer) another user USER_OTHER has been invited to join (role: Developer). USER_OTHER creates a fork FORK of MAIN. The repository FORK belongs to USER_OTHER and USER_MAIN has no access to it.
USER_OTHER commits changes to a specific branch in FORK and makes a merge request. Now USER_MAIN needs to see if the changes are correct.
And here is where I'm stuck. In the Merge request section of MAIN I get this:
I would like to checkout the branch locally. For that I clicked on Check out branch and got this:
I tried fetching it but I get
remote: The project you were looking for could not be found or you don't have permission to view it. fatal: repository 'https://XXXX/USER_OTHER/FORK.git' not found
And indeed since I'm not a member of FORK I cannot even see the repository.
How would I deal with this? I know that merge requests are not actually part of git but were rather introduced at a later stage (I think by GitHub) so I'm thinking perhaps I can complete the merge request only via the Web UI (or perhaps the GitLab API, which I don't want to deal with right now).