Google replaced perforce with Piper, a perforce compatible system written in-house. This system was not based on git. There were systems that allowed you to m

Google replaced perforce with Piper, a perforce compatible system written in-house. This system was not based on git. There were systems that allowed you to mirror portions of piper into local git repo, giving you a git-like experience on top of piper, but the underlaying system was piper and not git. (At this point my knowledge is 4 years out of date.)