$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-let.git /var/lib/mock/f42-build-3460606-45515/root/chroot_tmpdir/scmroot/ocaml-ppx-let
Cloning into '/var/lib/mock/f42-build-3460606-45515/root/chroot_tmpdir/scmroot/ocaml-ppx-let'...
$ git fetch origin 6e3180eea01af6b7d621ad36bdae0572561ee4bd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-let
 * [new ref]         6e3180eea01af6b7d621ad36bdae0572561ee4bd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e3180e Rebuild for ocaml-ppxlib 0.35.0