Back from a short hiatus, Pascal is joined by Jon to talk about the infrastructure that allows commit to sync between Meta's monorepo and GitHub. While ShipIt has been around for a while, allowing commits from the internal repository to sync out to GitHub, Diff Train is its younger brother to allow the inverse. This makes it possible for open-source-first projects like PyTorch to develop on GitHub and bring changes back into the monorepo without sacrificing security and reliability.

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Links:

• https://github.com/facebook/pyre-check
• https://github.com/facebookincubator/cinder
• https://github.com/facebook/hhvm
• https://github.com/facebook/fbshipit

Timestamps:

• Intro 0:06
• Intro Jon 1:49
• Open-sourcing an internal project 7:26
• Open Source Team @ Meta 10:22
• Third-party dependencies 12:07
• ShipIt 13:48
• Diff Train 29:01
• Most excited about 41:07
• The GIL 42:29
• Outro 44:22