controller_command_parse - return error when mandatory argument not passed

src/cntlr_commands.c

@@ -975,8 +975,18 @@ int controller_command_parse(const char *command, void *args, struct blob_attr *
 
 	memset(tb, 0, cmd->num_attrs * sizeof(*tb));
 	msg = (struct blob_attr *)args;
-	if (!msg || !blob_len(msg))
+	if (!msg || !blob_len(msg)) {
+		for (int i = 0; i < cmd->num_attrs; i++)  {
+			if (cmd->attrs[i].optional == 0) {
+				fprintf(stderr, "%s: mandatory arg '%s' not provided\n",
+					__func__, cmd->attrs[i].pol.name);
+				//blob_buf_free(&bi);
+				return -1;
+			}
+		}
+
 		return 0;
+	}
 
 #if 0	//TODO: for json string as input instead of blob_attr
 	printf("cmd: name = %s, num-pol = %zd args = %s\n", cmd->command, cmd->num_attrs, args);