Git is not used for their main repo. Git is used as a local cache for perforce where a branch roughly corresponds to a CL. Only subtrees of interest are checked out.
> Git is used as a local cache for perforce where a branch roughly corresponds to a CL. Only subtrees of interest are checked out.
That's a common use for git at Google, but not the only one (I'm a SWE). When I do use perforce I've got enough rhythm that it doesn't get in my way, but I really like git at Google for local branches on rapidly-changing subtrees. A lot of time I'll work on a branch to submit as a CL, but then realize I should do something else that depends on it. Perforce is a mess at this situation if the tree is changing much, and git is perfect if you just make a new branch.
