$ git clone -n https://src.fedoraproject.org/rpms/mtools.git /var/lib/mock/f41-build-side-1-3129808-39586/root/chroot_tmpdir/scmroot/mtools
Cloning into '/var/lib/mock/f41-build-side-1-3129808-39586/root/chroot_tmpdir/scmroot/mtools'...
$ git fetch origin dba8cf9e8e699615762e0a48839219b0eae12b9b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mtools
 * [new ref]         dba8cf9e8e699615762e0a48839219b0eae12b9b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dba8cf9 Update to 4.0.45 (#2315467)