$ git clone -n https://src.fedoraproject.org/rpms/ocaml-newt.git /var/lib/mock/f40-build-768404-125306/root/chroot_tmpdir/scmroot/ocaml-newt
Cloning into '/var/lib/mock/f40-build-768404-125306/root/chroot_tmpdir/scmroot/ocaml-newt'...
$ git fetch origin b349629883b549243ea7d3c7058a3b5bbfc5df2c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-newt
 * [new ref]         b349629883b549243ea7d3c7058a3b5bbfc5df2c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b349629 Bump release and rebuild