$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-let.git /var/lib/mock/f40-build-784296-133348/root/chroot_tmpdir/scmroot/ocaml-ppx-let
Cloning into '/var/lib/mock/f40-build-784296-133348/root/chroot_tmpdir/scmroot/ocaml-ppx-let'...
$ git fetch origin be7b943d1ad167e7f0e15a3fdf48056d4843a222:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-let
 * [new ref]         be7b943d1ad167e7f0e15a3fdf48056d4843a222 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at be7b943 Bump and rebuild