multiple group access to update repo

[Neal Kreitzinger <nkreitzinger@xxxxxxxxx>]

How do I allow users from different linux group to cd to a common bare 
mirror repo and also to a common non-bare cloned repo and perform 
git-fetch and git pull --ff-only?  Currently, the non-owner group gets 
this error:

error: cannot open FETCH_HEAD: Permission denied


v/r,
Neal

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