How to configure an existing git repo to be shared by a UNIX group

Question

I have an existing git repo (a bare one) which has up to this point only been writable by me. I want to open it up to some UNIX user group, foo, so that all members of foo

Answer 1

Try this to make an existing repository in repodir work for users in group foo:

chgrp -R foo repodir                 # set the group
chmod -R g+rw repodir                # allow the group to read/write
chmod g+s `find repodir -type d`     # new files get group id of directory
git init --bare --shared=all repodir # sets some important variables in repodir/config ("core.sharedRepository=2" and "receive.denyNonFastforwards=true")