The append-revisions-only can of worms

[Max Bowsher]

I've tracked down a cause of some of the AppendRevisionsOnlyViolation
failures.

When a package is uploaded to Debian and synced to Ubuntu, there's a
race condition between Launchpad's Debian metadata importer and the UDD
package importer.

If the UDD package importer tries to import the package in the window
when Launchpad knows of the Ubuntu publication but not of the Debian
publication, then the new package version gets imported first into the
Ubuntu branch.

Later, when the Debian publication becomes visible, Launchpad sees that
this particular (package,version) has already been imported.... and
tries to pull the Ubuntu branch into the Debian sid branch.

And of course, if the package has *ever* had an Ubuntu specific upload,
that's an AppendRevisionsOnlyViolation.

So we've actually found a bug here :-(

Max.

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