$ git clone -n https://src.fedoraproject.org/rpms/ocaml-mdx.git /var/lib/mock/f40-build-739814-109312/root/chroot_tmpdir/scmroot/ocaml-mdx
Cloning into '/var/lib/mock/f40-build-739814-109312/root/chroot_tmpdir/scmroot/ocaml-mdx'...
$ git fetch origin b31a970c3ee825a98e770802ba9c82f9b24f3b1c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-mdx
 * [new ref]         b31a970c3ee825a98e770802ba9c82f9b24f3b1c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b31a970 OCaml 5.1 rebuild for Fedora 40