$ git clone -n https://src.fedoraproject.org/rpms/ocaml-mccs.git /var/lib/mock/f40-build-2057673-49124/root/chroot_tmpdir/scmroot/ocaml-mccs
Cloning into '/var/lib/mock/f40-build-2057673-49124/root/chroot_tmpdir/scmroot/ocaml-mccs'...
$ git fetch origin 3ee2c23e8b47095c34be9e9c2e98c3282fff4048:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-mccs
 * [new ref]         3ee2c23e8b47095c34be9e9c2e98c3282fff4048 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ee2c23 Bump release and rebuild