$ git clone -n https://src.fedoraproject.org/rpms/ocaml-mccs.git /var/lib/mock/f42-build-865963-173613/root/chroot_tmpdir/scmroot/ocaml-mccs
Cloning into '/var/lib/mock/f42-build-865963-173613/root/chroot_tmpdir/scmroot/ocaml-mccs'...
$ git fetch origin 17bd63f2005293225e7ba86ab12354a1c3a92b3f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-mccs
 * [new ref]         17bd63f2005293225e7ba86ab12354a1c3a92b3f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 17bd63f OCaml 5.3.0 rebuild for Fedora 42