git-inject-tarball

Hi,

In the Everyday commands[1], there is an example of of extracting a
tarball and then working with it.  I'm finding that I'm doing this fairly
often -- I was just wondering if anyone had anything like a
'git-inject-tarball' script they'd written up.

Thanks,
Anand

[1]: http://www.kernel.org/pub/software/scm/git/docs/everyday.html