repmgr master register: support --dry-run

repmgr-action-master.c

@@ -67,6 +67,18 @@ do_master_register(void)
 		exit(ERR_BAD_CONFIG);
 	}
 
+	/*
+	 * In --dry-run mode we can't proceed any further as the following code
+	 * attempts to query the repmgr metadata, which won't exist until
+	 * the extension is installed
+	 */
+	if (runtime_options.dry_run == true)
+	{
+		PQfinish(conn);
+		return;
+	}
+
+
 	/* Ensure there isn't another registered node which is master */
 	master_conn = get_master_connection(conn, &current_master_id, NULL);
 
@@ -134,6 +146,7 @@ do_master_register(void)
 					config_file_options.upstream_node_id);
 		log_detail(_("the value set for \"upstream_node_id\" will be ignored"));
 	}
+
 	/* set type to "master", active to "true" and unset upstream_node_id*/
 	node_info.type = MASTER;
 	node_info.upstream_node_id = NO_UPSTREAM_NODE;