On Wednesday, May 21, 2014, Jeff Sickel <jas@corpus-callosum.com> wrote:

> Git is the closest as it’s just C,
> sort of: it’s a whole lot of code.  But why would you want to
> bring in “178K lines of *.[ch], 20K lines of shell scripts, 100K+
> lines of test scripts” and have to lug in the massive payload
> of Python and Perl just to make it functional?
>
 In case anyone is _really determined_ to do this: libgit2 has only
117K lines of code, better than git's 178K. It also has a mere 200 lines of
shell, total. It doesn't depend on Python or Perl. It's also supposed to be
much more portable than git, though I dunno if that would actually work out
for Plan 9. Probably not that much.
You could try porting libgit2 and then write some small C wrappers using it.