fast-import mirroring a foreign repository

[Matt McClure]

What's the best way to mirror a foreign repository with `bzr
fast-import`?  When I looked into it several months ago, it seemed
that `bzr fast-import` required the entire fast-import stream,
starting at the point of the original import, to make subsequent
incremental imports work.  Is that still the case?

-- 
Matt
http://www.google.com/profiles/matthewlmcclure