Shared Repos

Take .git dir. Set base = true. Then:

As Marc said, you should first make sure that "config" contains
"sharedrepository = 1" in the "[core]" section.

Then you can do the following:

  - remove all permissions for "others":  chmod -R o-rwx .
  - mirror "user" permissions to "group": chmod -R g=u .
  - add +s flag to directories:           find . -type d | xargs chmod g+s

This should fix your current situation. The "sharedrepository = 1"
will tell git to maintain a proper shared state in the future
on objects it creates (i.e. mirror "user" permission to "group" ones).