Git keeps removing group write permissions

Question

I have a git repository that I am sharing with several developers. We do regular git pulls and pushes with it. Unfortunately, every time I do a git pull the changed files lose the group write permission. How do I stop git from doing this?

I am running this on Ubuntu 12.04 LTS.

The config on the shared repo looks like this:

[core]
        repositoryformatversion = 0
        filemode = true
        bare = true
        sharedRepository = group

I also ran the following commands on it in an attempt to fix it

find repo.git -type d -exec chmod g+rws {} +
sudo chmod -R g+rw repo.git/objects

No matter what I end up with folders with 755 and files with 644 when I want 775 and 664 respectively.

Answer 1

You should use the core.sharedRepository=group or core.sharedRepository=0664 setting.

See e.g. http://criticallog.thornet.net/2010/01/07/sharing-your-git-repository/