def _determine_sg_rules_to_remove(self, filtered_ports):
        port_group_ids = self._get_sg_ids_set_for_ports(filtered_ports)
        return set(self.pre_sg_rules) - port_group_ids
Vacuums the build db.
dataset/ETHPy150Open openstack/neutron/neutron/agent/linux/iptables_firewall.py/IptablesFirewallDriver._determine_sg_rules_to_remove--crossover with--dataset/ETHPy150Open lektor/lektor/lektor/builder.py/BuildState.vacuum