$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-fields-conv.git /var/lib/mock/f40-build-784291-133348/root/chroot_tmpdir/scmroot/ocaml-ppx-fields-conv
Cloning into '/var/lib/mock/f40-build-784291-133348/root/chroot_tmpdir/scmroot/ocaml-ppx-fields-conv'...
$ git fetch origin 4a4cffba1fa4c02427d49d5a6ad99c544dd85a5c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-fields-conv
 * [new ref]         4a4cffba1fa4c02427d49d5a6ad99c544dd85a5c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4a4cffb Rebuild for changed ocamlx(Location) hash