Google copybara: moving code between repositories

Google Copybara is an open-source tool that enables organizations to safely synchronize code between multiple repositories with transformation capabilities, addressing critical needs for enterprises managing both confidential and public codebases. For IT organizations, Copybara reduces manual code synchronization overhead, enforces single-source-of-truth governance through designated authoritative repositories, and supports complex multi-repository strategies while maintaining audit trails through stateless, commit-message-based state tracking. This tool is particularly valuable for hybrid development environments and organizations requiring strict code governance across internal, partner, and public repositories.