$ git clone -n https://src.fedoraproject.org/rpms/ocaml-mccs.git /var/lib/mock/f41-build-846595-163131/root/chroot_tmpdir/scmroot/ocaml-mccs
Cloning into '/var/lib/mock/f41-build-846595-163131/root/chroot_tmpdir/scmroot/ocaml-mccs'...
$ git fetch origin b56d072d9afa2803916c9bd2ab901c3ec5b503f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-mccs
 * [new ref]         b56d072d9afa2803916c9bd2ab901c3ec5b503f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b56d072 New version 1.1+18