[superdisk]

For what it's worth they do call it out in the manual as a common thing to do: https://git-scm.com/book/ms/v2/Git-on-the-Server-The-Protoco...

Granted I've never tried it so take it with a grain of salt.

[kragen]

That makes me a little less suspicious, and of course the Git developers are well aware of things like concurrency problems and filesystem limitations. But I'd still regard it as an area to be wary of. But only if two clients might be writing to the same repo concurrently.