Gitolite is a lightweight tool for managing access control to Git
repositories.  We use it at the FSF and it works pretty well.

AFAICT, I've managed to avoid propogating Perl, but I have to propagate
OpenSSH and Git for now.  They are referenced in too many scripts in too
many ways for a regexp substitution to do a good job.  Fixing this
requires working with the upstream maintainers, I think.