$ git clone -n https://src.fedoraproject.org/rpms/ocaml-mdx.git /var/lib/mock/f41-build-857709-168178/root/chroot_tmpdir/scmroot/ocaml-mdx
Cloning into '/var/lib/mock/f41-build-857709-168178/root/chroot_tmpdir/scmroot/ocaml-mdx'...
$ git fetch origin 1daea2569cc15094d8d918d555326b43ff695d77:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-mdx
 * [new ref]         1daea2569cc15094d8d918d555326b43ff695d77 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1daea25 Rebuild for ocaml-version 3.6.8