Git newbie question: permissions

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Hi everyone,

I have a bare git repository that users in a particular group
("webdev") are pulling from and pushing to using the ssh transport.
One of the users has just reported this error during a push:

Counting objects: 103, done.
Compressing objects: 100% (68/68), done.
error: unable to write sha1 filename
./objects/4f/
973ce5c66f082af5087948cec57001f0c4da50: Permission denied

fatal: failed to write object
error: pack-objects died with strange error
error: failed to push some refs to '/var/git/myrepo.git'

I'd appreciate some help on getting my repository back to a sane
state, allowing this user to finish his push, and making sure
permissions are right in the future.

I don't think I specified "--shared=group" when initializing the
repository. Afterwards I manually set all files to have 660
permissions, dirs as 770, and set the group ownership to "webdev", but
I probably made a mistake by not setting the setgid bit on
directories. Now there are some objects directories with 755
permissions and different group ownership (the default groups of the
other users).

I have now run "git --bare init --shared=group" to reinitialize the
repository. This seems to have changed the directories to be g+sx. (Is
this all it did?). There are still some objects directories with 755
permissions rather than 770, which I presume I want, and the group
ownership of these is wrong. Shall I change these by hand? The sha1
files all have 444 permissions; is this right?

The last question I have is how to ensure that git creates object
files etc. with the right permissions when users push in future.

I'd appreciate any help!

-- Ed
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