One of the teams I work closely with used JGit's extensibility to run git on top of a KVS: https://medium.com/@palantir/stemma-distributed-git-server-7...

Notably this doesn't require a distributed filesystem.

That looks really interesting, thanks for posting. I added it to our issue https://gitlab.com/gitlab-com/infrastructure/issues/727#note...

For Visual Studio Online and TFS, Microsoft is using libgit2 and some custom ASP.NET code for the upload-pack / receive-pack endpoints, stuffing the data into SQL Azure. No filesystem, no `git` executable.

Relevant: http://githubengineering.com/introducing-dgit/