$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-fields-conv.git /var/lib/mock/f38-build-side-42-init-devel-780807-27898/root/chroot_tmpdir/scmroot/ocaml-ppx-fields-conv
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-780807-27898/root/chroot_tmpdir/scmroot/ocaml-ppx-fields-conv'...
$ git fetch origin f442fcf4e3c29186faa0ed24a33d2a02e41553d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-fields-conv
 * [new ref]         f442fcf4e3c29186faa0ed24a33d2a02e41553d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f442fcf Rebuild OCaml packages for F38