$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-deriving.git /var/lib/mock/f38-build-side-42-init-devel-785622-27967/root/chroot_tmpdir/scmroot/ocaml-ppx-deriving
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-785622-27967/root/chroot_tmpdir/scmroot/ocaml-ppx-deriving'...
$ git fetch origin 14fa0a0a6dce329e29470c55c1cae8127d4f551d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-deriving
 * [new ref]         14fa0a0a6dce329e29470c55c1cae8127d4f551d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 14fa0a0 Rebuild OCaml packages for F38