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Git-to-Git imports

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Launchpad has had Git-to-Bazaar code imports since 2009, along with imports from a few other systems.  These form part of Launchpad’s original mission to keep track of free software, regardless of where it’s hosted.  They’re also very useful for automatically building other artifacts, such as source package recipes or snap packages, from code hosted elsewhere.  Unfortunately they’re quite complicated: they need to be able to do a full round-trip conversion of every revision from the other version control system, which has made it difficult to add support for Git features such as signed commits or submodules.  Once one of these features is present anywhere in the history of a branch, importing it to Bazaar becomes impossible.  This has been a headache for many users.

We can do better nowadays.  As of last year, we have direct Git hosting support in Launchpad, and we can already build snaps and recipes straight from Git, so we can fulfil our basic goal more robustly now with a lot less code.  So, Launchpad now supports Git-to-Git code imports, also known as Git mirroring.  You can use this to replace many uses of Git-to-Bazaar imports (note that there’s no translations integration yet, and of course you won’t be able to branch the resulting import using bzr).

See our Git documentation for more details.


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