$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-stable-witness.git /var/lib/mock/f41-build-838633-159735/root/chroot_tmpdir/scmroot/ocaml-ppx-stable-witness
Cloning into '/var/lib/mock/f41-build-838633-159735/root/chroot_tmpdir/scmroot/ocaml-ppx-stable-witness'...
$ git fetch origin 16ef8a54a703c9f90d8afdc2b93c126006c7c110:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-stable-witness
 * [new ref]         16ef8a54a703c9f90d8afdc2b93c126006c7c110 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 16ef8a5 Rebuild for ocaml-ppxlib 0.33.0