$ git clone -n https://src.fedoraproject.org/rpms/ocaml-mdx.git /var/lib/mock/f40-build-784461-133438/root/chroot_tmpdir/scmroot/ocaml-mdx
Cloning into '/var/lib/mock/f40-build-784461-133438/root/chroot_tmpdir/scmroot/ocaml-mdx'...
$ git fetch origin cad972bbfad0e946e36f0dbbc6ccecada99046dc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-mdx
 * [new ref]         cad972bbfad0e946e36f0dbbc6ccecada99046dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cad972b Version 2.4.0