$ git clone -n https://src.fedoraproject.org/rpms/iptables.git /var/lib/mock/f40-build-2237012-53529/root/chroot_tmpdir/scmroot/iptables
Cloning into '/var/lib/mock/f40-build-2237012-53529/root/chroot_tmpdir/scmroot/iptables'...
$ git fetch origin 86e59a1ef9148016f717558dda3478f5740c1a06:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/iptables
 * [new ref]         86e59a1ef9148016f717558dda3478f5740c1a06 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86e59a1 iptables-1.8.10-5