Disclosure: I work at Google, but not on Copybara. I've seen Copybara used at Google in both directions: for some projects, the internal repo is the authoritat

Disclosure: I work at Google, but not on Copybara. I've seen Copybara used at Google in both directions: for some projects, the internal repo is the authoritative one, and for others, the external repo is authoritative. Copybara is not prescriptive, you can go in either direction.