git p4 diff-tree ambiguous argument error

[Bill Door <duanemurphy@mac.com>]

$ git p4 sync --detect-branches --import-labels //main@all
... Lots of useful information elided
fatal: ambiguous argument 'git-p4-tmp/8031': unknown revision or path not in
the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'
Command failed: ['git', 'diff-tree',
'6b3ef26a3e2635a5ff0170e15fdadb386672f8b9', 'git-p4-tmp/8031']

If I re-run the command, it works the second time. Of course there are
73000+ commits. This is gonna take a while.

I've done some debugging. It appears there is a timing problem between
git-p4 and git. 

The failure occurs in P4Sync.searchParent(). Even though a checkpoint is
sent to git (for fast-import) just prior to the call to searchParent() in
importChanges(), the file does not yet exist. I used pdb, paused the program
just before the call to diff-tree and the file was missing. After the
program exits due to the error the file exists (i.e. the OS flushed the
file). This is why re-running continues to work, there is an "old" file with
basically the same information laying around (dangerous).

How can I get git (fast-import) to flush the file at the right time?

$ git --version
git version 1.7.12.4
$ python --version
Python 2.6.6
OS: GNU/Linux 2.6.32-431.el6.x86_64




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