$ git clone -n https://src.fedoraproject.org/rpms/python-gearbox.git /var/lib/mock/f45-build-30827-647/root/chroot_tmpdir/scmroot/python-gearbox
Cloning into '/var/lib/mock/f45-build-30827-647/root/chroot_tmpdir/scmroot/python-gearbox'...
$ git fetch origin 89062c56ed9847c3c0f77d2ac12040183fdcc8af:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-gearbox
 * [new ref]         89062c56ed9847c3c0f77d2ac12040183fdcc8af -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 89062c5 Update to upstream.