On the old (current) git server, we have disabled force push on the server to prevent accidentally rewriting history on the moodle.git repo (and integration.git). We can temporarily disable it (and we do) to rewrite on integration.git - but never on moodle.git.

We would like some way to do this on the new gitlab server.

This is not yet supported by gitlab - but there are patches available:

https://github.com/gitlabhq/gitlabhq/pull/6190

http://feedback.gitlab.com/forums/176466-general/suggestions/4450362-add-better-branch-protection-against-history-rewri