Copy a single file from local Git repository

Expanding on vorac's commnt, fined grained permissions is one of the main reasons to use dedicated git server software.

Relying on linux's file system permissions just doesn't work for anything except read-only permission. As you've discovered, when other user's modify the repository they own files they've uploaded and have completely control of the permissions on those files so can actually be quite distructive with it.

The only way around this is to force users to access via dedicated git server software. This can still allow users to access via the ssh protocol but they do so either by a completely customised SSH server or, in the case of gitolite, a very customised SSH user.

For very simple light weight setup gitolite is good enough. Over time you may find yourself wanting to migrate to more complext ERM tools like gitlab.

From git man:

--contains [<commit>]

Only list branches which contain the specified commit (HEAD if not specified). Implies --list.

and

With --contains, shows only the branches that contain the named commit (in other words, the branches whose tip commits are descendants of the named commit).

Just use

git branch

which should show all the local branches of your repo. The starred branch is your current branch.

If you want to retrieve only the name of the branch you are on, you can do:

git branch | grep \* | cut -d ' ' -f2