$ git clone -n https://src.fedoraproject.org/rpms/ocaml-mdx.git /var/lib/mock/f40-build-2358365-60309/root/chroot_tmpdir/scmroot/ocaml-mdx
Cloning into '/var/lib/mock/f40-build-2358365-60309/root/chroot_tmpdir/scmroot/ocaml-mdx'...
$ git fetch origin 203726974b48da3243d00d077f4a2aa78b427193:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-mdx
 * [new ref]         203726974b48da3243d00d077f4a2aa78b427193 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2037269 Rebuild for changed ocamlx hashes