git fast-import : How to change parent during import?

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Hi everyone,

Is it possible to change the parent of a commit during fast import?
I've tried using "reset" command and making a new commit pointing to a
new parent, but in both cases I get a "new tip ... does not contain
..." error message.

Providing a bit of context. I'm trying to improve git-p4 to detect the
parent commit of a new branch. Unfortunately, in Perforce a branch is
nothing more than a copy of a bunch of files into a new location.
Because the origin of the copy can be any past commit and there is no
information about which commit was used it is very difficult to
identify a parent of a new branch. But if we assume that in this copy
process no file is modified then it should be possible to identify the
parent commit simply by comparing their SHA-1.
To achieve this I used the checkpoint command to flush the list of
imported commits to disk and then used standard rev-list and diff-tree
commands to make find the parent commit. I am now at a point where I
am able to correctly identify the parent commit, but when trying to
update the from information I get the above message.

Thanks in advance for your help,
-- 
Vitor Antunes
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