$ git clone -n https://src.fedoraproject.org/rpms/ocaml-mdx.git /var/lib/mock/f40-build-803273-144214/root/chroot_tmpdir/scmroot/ocaml-mdx
Cloning into '/var/lib/mock/f40-build-803273-144214/root/chroot_tmpdir/scmroot/ocaml-mdx'...
$ git fetch origin f33686f584001188d830a551091a39543d6ef8f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-mdx
 * [new ref]         f33686f584001188d830a551091a39543d6ef8f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f33686f Version 2.4.1