The latest bzr-builder release should support this via the new nest-part instruction (the fix for bug 479705), but Launchpad isn't using that version of bzr-builder yet. I've added Soyuz (which I think is the relevant Launchpad component to this bug).
The latest bzr-builder release should support this via the new nest-part instruction (the fix for bug 479705), but Launchpad isn't using that version of bzr-builder yet. I've added Soyuz (which I think is the relevant Launchpad component to this bug).