$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-fields-conv.git /var/lib/mock/f42-build-872561-178112/root/chroot_tmpdir/scmroot/ocaml-ppx-fields-conv
Cloning into '/var/lib/mock/f42-build-872561-178112/root/chroot_tmpdir/scmroot/ocaml-ppx-fields-conv'...
$ git fetch origin 6bb2ce361f60568c30c4a9d0fe95c94538ef3730:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-fields-conv
 * [new ref]         6bb2ce361f60568c30c4a9d0fe95c94538ef3730 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6bb2ce3 Rebuild for ocaml-ppxlib 0.35.0