Comment 1 for bug 261339

Whats happening is that the knit repo has a revision that is in delta format.
So we go to insert the revision to the pack, lookup a delta->ft adapter, and then try to adapt, but the revisions parent text is not available, and so we get an error raised about the parent revision not being present in the pack repo.

Possible fixes;
 - ask for full texts when fetching revisions.
 - ask for toplogical order of revisions eventhough packs don't need that
 - ask for the fullback in the source vf (doesn't play well with networks)