+ if (may_exist) {
+ struct vsctl_port *port;
+
+ port = find_port(&info, port_name, false);
+ if (port) {
+ struct svec want_names, have_names;
+ size_t i;
+
+ svec_init(&want_names);
+ for (i = 0; i < n_ifaces; i++) {
+ svec_add(&want_names, iface_names[i]);
+ }
+ svec_sort(&want_names);
+
+ svec_init(&have_names);
+ for (i = 0; i < port->port_cfg->n_interfaces; i++) {
+ svec_add(&have_names, port->port_cfg->interfaces[i]->name);
+ }
+ svec_sort(&have_names);
+
+ if (strcmp(port->bridge->name, br_name)) {
+ char *command = vsctl_context_to_string(ctx);
+ vsctl_fatal("\"%s\" but %s is actually attached to bridge %s",
+ command, port_name, port->bridge->name);
+ }
+
+ if (!svec_equal(&want_names, &have_names)) {
+ char *have_names_string = svec_join(&have_names, ", ", "");
+ char *command = vsctl_context_to_string(ctx);
+
+ vsctl_fatal("\"%s\" but %s actually has interface(s) %s",
+ command, port_name, have_names_string);
+ }
+
+ svec_destroy(&want_names);
+ svec_destroy(&have_names);
+
+ return;
+ }
+ }