$ git clone -n https://src.fedoraproject.org/rpms/cantera.git /var/lib/mock/f41-build-735036-13218/root/chroot_tmpdir/scmroot/cantera
Cloning into '/var/lib/mock/f41-build-735036-13218/root/chroot_tmpdir/scmroot/cantera'...
$ git fetch origin d31bd45a130f125eeb685e07db8d9c5c04dd45c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cantera
 * [new ref]         d31bd45a130f125eeb685e07db8d9c5c04dd45c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d31bd45 Rebuild for sundials-6.7.0