$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-stable-witness.git /var/lib/mock/f39-build-2472483-61488/root/chroot_tmpdir/scmroot/ocaml-ppx-stable-witness
Cloning into '/var/lib/mock/f39-build-2472483-61488/root/chroot_tmpdir/scmroot/ocaml-ppx-stable-witness'...
$ git fetch origin 632256bd7d7a7e35c1e75bb746b1bd19b845fa9c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-stable-witness
 * [new ref]         632256bd7d7a7e35c1e75bb746b1bd19b845fa9c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 632256b Rebuild for changed ocamlx hashes