$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-deriving-yojson.git /var/lib/mock/f41-build-side-1-3055144-38325/root/chroot_tmpdir/scmroot/ocaml-ppx-deriving-yojson
Cloning into '/var/lib/mock/f41-build-side-1-3055144-38325/root/chroot_tmpdir/scmroot/ocaml-ppx-deriving-yojson'...
$ git fetch origin f185c2393fdf875aacee0490d7adcf31d8c77408:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-deriving-yojson
 * [new ref]         f185c2393fdf875aacee0490d7adcf31d8c77408 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f185c23 Version 3.9.0