$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-deriving-yojson.git /var/lib/mock/f40-build-784287-133348/root/chroot_tmpdir/scmroot/ocaml-ppx-deriving-yojson
Cloning into '/var/lib/mock/f40-build-784287-133348/root/chroot_tmpdir/scmroot/ocaml-ppx-deriving-yojson'...
$ git fetch origin 02d78e6436c6533cbccbfb5aee3f65a3e61ad9d8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-deriving-yojson
 * [new ref]         02d78e6436c6533cbccbfb5aee3f65a3e61ad9d8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 02d78e6 Rebuild for changed ocamlx(Location) hash