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If the only need you need is sync repos without exclusions or transformations I wouldn't bother, it could work for you until it doesn't when they archive it or kill it like kaniko or so many other google products/tools. Gitlab has really simple way to mirror from Gitlab to Github or other git vendors/servers
Some other interesting tools in the space. Rust is using a tool called Josh to sync commits: https://josh-project.dev The blog post from the Rust people: https://blog.rust-lang.org/inside-rust/2026/06/04/how-josh-h... Meta used to have an open source tool called fbshipit. But according to its open source repo they no longer use it: https://github.com/facebookarchive/fbshipit Any others in this space?
git subtree was the OG tool: https://apenwarr.ca/log/20090430 It has since been merged into git proper: https://manpages.debian.org/testing/git-man/git-subtree.1.en... https://docs.github.com/en/get-started/using-git/about-git-s...
To those who have used it: is it handy for situations where you have multiple repos that want to share a little code, but it's not worth the trouble of extracting a library, referencing it, publishing versioned releases, updating dependent repos, etc? And instead just "sync" a code folder from one main repo (perhaps containing common domain models) to other repos? Basically the Go philosophy that a little bit of copy…
It’s largely used for syncing external open source projects with the monorepo. Policy is to require source code imports over built artifacts. Though you can get exceptions. Some projects are also developed in the monorepo and exported via Copybara. My team also uses it to version Starlark rule sets internally.
Handwritten bash scripts using git-replace and git-filter-repo [1] did a much better job
Earlier quoted context omitted.
git subtree was the OG tool: https://apenwarr.ca/log/20090430 It has since been merged into git proper: https://manpages.debian.org/testing/git-man/git-subtree.1.en... https://docs.github.com/en/get-started/using-git/about-git-s...
The rust blog post covers this. Subtree performance is terrible on larger repos and they didn’t land something that would fix it on medium sized ones. That’s why they went with a better maintained solution that scales.
I wish all the effort into things like JJ and Pijul was going into solving those sorts of things instead!