Git CVS Import Questions

I have a question about git cvs's import.

I have the following setup in ~/.bashrc:

export CVS_RSH=ssh export CVSROOT=cvs:/cvs export CVS_RSH CVSROOT

and I can do a cvs import using git by doing something along these lines:

mkdir bar; git cvsimport -v Foo/Bar which checks out the history of module Bar into the current directory (in this case bar)

now... if I do this again in another directory

mkdir bar2; git cvsimport -v Foo/Bar which repeats the same process the hashes don't match up.

case in point: git log --oneline | head -n 1 2fa5b70 ChangeLog: * Fixing build file syntax error. git log --oneline | head -n 1 ccef115 ChangeLog: * Fixing build file syntax error.

Now, correct me if I'm wrong.. but I thought the hashes were generated based on the content of the diff. So shouldn't two cvs checkouts containing the same data have the same hashes? ie. If a git commit is generated based on a particular diff, then the hash should always be the same, should it not?

Am I missing something?  I'm just trying to understand the behavior...