$ git clone -n https://src.fedoraproject.org/rpms/ocaml-sexplib.git /var/lib/mock/f40-build-2195244-51522/root/chroot_tmpdir/scmroot/ocaml-sexplib
Cloning into '/var/lib/mock/f40-build-2195244-51522/root/chroot_tmpdir/scmroot/ocaml-sexplib'...
$ git fetch origin 58aff3ac435c2d5827748a786997cd0fff6e8e25:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-sexplib
 * [new ref]         58aff3ac435c2d5827748a786997cd0fff6e8e25 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 58aff3a Rebuild for ocaml-num