lm@bitmover.com said:
> We've already built all the interfaces you need to do this, so would
> you be interested in writing the shell script that does it?  The
> interfaces you will want:

>         bk export -tpatch
>         bk import -tpatch
>         bk comments
>         bk changes -v

> You'll want this, I believe that you can take the output of this
> command and feed it into bk comments and have that be a noop.  If that
> works, this is what you need to save as the comments part of the
> patch, and now it's pretty trivial to move the patch backwards.

I've got a shell script which does this (I use it to take test patches from my 
build tree back to a pristine source for submission to linus).  I'm afraid 
it's a bit rough and ready, but it takes a given set of changes, wraps them up 
as patches, extracts the comments and applies them as patches to a different 
tree and then inserts the comments.  I wrote it a while ago, so it may be a 
little dusty and lacking in the newer bitkeeper features.

James