$ git clone -n https://src.fedoraproject.org/rpms/ocaml-mccs.git /var/lib/mock/f40-build-2238706-53584/root/chroot_tmpdir/scmroot/ocaml-mccs
Cloning into '/var/lib/mock/f40-build-2238706-53584/root/chroot_tmpdir/scmroot/ocaml-mccs'...
$ git fetch origin 86c0f6b9fd417d088a624f1d03482a4a8561f46c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-mccs
 * [new ref]         86c0f6b9fd417d088a624f1d03482a4a8561f46c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86c0f6b New upstream version 1.1+17 (RHBZ#2255456)