gistfile1.txt

 def _set_network(self, section_name="network"):
        if "neutron" in self.available_services:
            neutron = self.clients.neutron()
            public_net = [net for net in neutron.list_networks()["networks"] if
                          net["status"] == "ACTIVE" and
                          net["router:external"] is True]
            if public_net:
		net_id = public_net[0]["id"]
                self.conf.set(section_name, "public_network_id", net_id)
                public_router = neutron.list_routers(
                    network_id=net_id)["routers"][0]
                self.conf.set(section_name, "public_router_id",
                              public_router["id"])
                subnets = neutron.list_subnets(network_id=net_id)["subnets"]
		if subnets:
                    subnet = subnets[0]
                else:
                    # TODO(akurilin): create public subnet                                                                                                                                  
                    LOG.warn("No public subnet is found.")
            else:
                subnets = neutron.list_subnets()["subnets"]
                if subnets:
                    subnet = subnets[0]
                else:
                    # TODO(akurilin): create subnet                                                                                                                                         
                    LOG.warn("No subnet is found.")
            self.conf.set(section_name, "default_network", subnet["cidr"])