We have made the HTTP protocol works for our git repository.

• Make Git work on HTTP protocol

We need to made the files writable by Apache otherwise you could never push the commits back to the server.

To setup a new repository, we could flag it as a shared repository during initialization. Then we could change the repository root folder.

git init --bare --shared=group <new-repo>.git
chgrp -R <group> <new-repo>.git

If that is an existing repository, we have to do a few steps more

1. Set the group.

chgrp -R <group> <existing-repo>.git

2. Flag the repository as a shared repository by editing the <existing-repo>.git/config.

[core]
        repositoryformatversion = 0
        filemode = true
        bare = true
        sharedrepository = 1

3. Make sure the <existing-repo>.git/objects is writable by the group.

chmod -R 775 objects

Done =)

Reference: StackOverflow – How to configure an existing git repo to be shared by a UNIX group