Arcanist, a command-line interface to Phabricator

Phabricator (pronounced like the word fabricator) is a suite of web
applications which make it easier to build software, particularly when
working with teams. Phabricator is largely based on Facebook's internal
tools.

Arcanists provides command-line access to many Phabricator tools (like
Differential, Files, and Paste), integrates with static analysis
("lint") and unit tests, and manages common workflows like getting
changes into Differential for review.

http://phabricator.org/
I think one thing that could be done is to run `arc upgrade` though it looks like the .git directories are stripped of the resources which would prevent the installation from being able to update. Is there a way to keep those directories around?