A tool for transforming and moving code between repositories.

Copybara is a tool used internally at Google. It transforms and moves code between repositories.

Often, source code needs to exist in multiple repositories, and Copybara allows you to transform and move source code between these repositories. A common case is a project that involves maintaining a confidential repository and a public repository in sync.

Copybara requires you to choose one of the repositories to be the authoritative repository, so that there is always one source of truth. However, the tool allows contributions to any repository, and any repository can be used to cut a release.

The most common use case involves repetitive movement of code from one repository to another.…