$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-deriving-yaml.git /var/lib/mock/f41-build-838606-159730/root/chroot_tmpdir/scmroot/ocaml-ppx-deriving-yaml
Cloning into '/var/lib/mock/f41-build-838606-159730/root/chroot_tmpdir/scmroot/ocaml-ppx-deriving-yaml'...
$ git fetch origin 04794bad2438ad29c1d47315f544d852a1397c70:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-deriving-yaml
 * [new ref]         04794bad2438ad29c1d47315f544d852a1397c70 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 04794ba Rebuild for ocaml-ppxlib 0.33.0