Add support for displaying the schema data model with '-d' option

src/main.c

@@ -253,6 +253,7 @@ static void usage(const char *prog)
 	fprintf(stderr, "\n");
 	fprintf(stderr, "options:\n");
 	fprintf(stderr, "    -l  <0-7> Set the loglevel\n");
+	fprintf(stderr, "    -d <schema dm>  Display the schema data model supported by micro-service\n");
 	fprintf(stderr, "    -h  Displays this help\n");
 	fprintf(stderr, "\n");
 }
@@ -260,9 +261,9 @@ static void usage(const char *prog)
 int main(int argc, char **argv)
 {
 	int log_level = 7;
-	int c = 0;
+	int c = 0, dm_type = 0;
 
-	while ((c = getopt(argc, argv, "hl:")) != -1) {
+	while ((c = getopt(argc, argv, "hdl:")) != -1) {
 		switch (c) {
 		case 'l':
 			log_level = (int)strtod(optarg, NULL);
@@ -270,6 +271,9 @@ int main(int argc, char **argv)
 				log_level = 7;
 			}
 			break;
+		case 'd':
+			dm_type++;
+			break;
 		case 'h':
 			usage(argv[0]);
 			exit(0);
@@ -278,18 +282,24 @@ int main(int argc, char **argv)
 			exit(0);
 		}
 	}
-	load_system_users();
-	load_system_groups();
 
 	memset(&bbfdm_ctx, 0, sizeof(struct bbfdm_context));
 
-	create_groups();
-	create_users();
-
 	bbfdm_ubus_set_service_name(&bbfdm_ctx, "usermngr");
 	bbfdm_ubus_set_log_level(log_level);
 	bbfdm_ubus_load_data_model(tDynamicObj);
 
+	if (dm_type > 0) {
+		int res = bbfdm_print_data_model_schema(&bbfdm_ctx, dm_type);
+		exit(res);
+	}
+
+	load_system_users();
+	load_system_groups();
+
+	create_groups();
+	create_users();
+
 	if (bbfdm_ubus_regiter_init(&bbfdm_ctx))
 		goto out;