Shared repositories and umask

Hello, world!\n

I'm playing with a shared repository and I am still unable to get the file and directory permissions kept correctly, that is writeable to a group.

Setting the `core.sharedrepository' flag helps a bit, but not completely: the object files and directories are group-writeable, but for example new head refs aren't.

The documentation hints on setting umask, but I would really like to avoid doing that globally, because the user accounts are used for many other things as well where the permissions should be tighter.

It seems that a correct solution would be to add an `umask' option to the repository config and make enter_repo() adjust the umask accordingly.

I was thinking about doing the same in setup_git_directory() for the local commands, but that probably doesn't make much sense since many commands are in fact scripts creating files themselves.

If you agree, I will send a patch.

				Have a nice fortnight