daemon/main: support multiple config files

daemon/main.c

@@ -55,6 +55,8 @@
 /* @internal Array of ip address shorthand. */
 typedef array_t(char*) addr_array_t;
 
+typedef array_t(const char*) config_array_t;
+
 typedef struct {
 	int fd;
 	endpoint_flags_t flags; /**< .sock_type isn't meaningful here */
@@ -66,7 +68,7 @@ struct args {
 	flagged_fd_array_t fds;
 	int control_fd;
 	int forks;
-	const char *config;
+	config_array_t config;
 	const char *rundir;
 	bool interactive;
 	bool quiet;
@@ -495,6 +497,7 @@ static void args_deinit(struct args *args)
 	for (int i = 0; i < args->fds.len; ++i)
 		free_const(args->fds.at[i].flags.kind);
 	array_clear(args->fds);
+	array_clear(args->config);
 }
 
 static long strtol_10(const char *s)
@@ -534,7 +537,7 @@ static int parse_args(int argc, char **argv, struct args *args)
 			array_push(args->addrs_tls, optarg);
 			break;
 		case 'c':
-			args->config = optarg;
+			array_push(args->config, optarg);
 			break;
 		case 'f':
 			args->interactive = false;
@@ -759,12 +762,16 @@ int main(int argc, char **argv)
 		}
 	}
 
-	if (args.config && strcmp(args.config, "-") != 0 && access(args.config, R_OK) != 0) {
-		kr_log_error("[system] config '%s': %s\n", args.config, strerror(errno));
-		return EXIT_FAILURE;
+	/* Check config(s) are read-able */
+	for (size_t i = 0; i < args.config.len; ++i) {
+		const char *config = args.config.at[i];
+		if (config != NULL && strcmp(config, "-") != 0 && access(config, R_OK) != 0) {
+			kr_log_error("[system] config '%s': %s\n", config, strerror(errno));
+			return EXIT_FAILURE;
+		}
 	}
-	if (!args.config && access("config", R_OK) == 0) {
-		args.config = "config";
+	if (args.config.len == 0 && access("config", R_OK) == 0) {
+		array_push(args.config, "config");
 	}
 
 	/* File-descriptor count limit: soft->hard. */
@@ -868,20 +875,29 @@ int main(int argc, char **argv)
 		ret = EXIT_FAILURE;
 		goto cleanup;
 	}
-	if (args.config != NULL && strcmp(args.config, "-") != 0) {
-		if(engine_loadconf(&engine, args.config) != 0) {
+
+	bool load_defaults = true;
+	for (size_t i = 0; i < args.config.len; ++i) {
+		const char *config = args.config.at[i];
+		if (config == NULL)
+			continue;
+		if (strcmp(config, "-") == 0) {
+			load_defaults = false;
+			continue;
+		}
+		if(engine_loadconf(&engine, config) != 0) {
 			ret = EXIT_FAILURE;
 			goto cleanup;
 		}
 		lua_settop(engine.L, 0);
 	}
-	if (args.config == NULL || strcmp(args.config, "-") !=0) {
-		if(engine_load_defaults(&engine) != 0) {
-			ret = EXIT_FAILURE;
-			goto cleanup;
-		}
+	if (load_defaults && engine_load_defaults(&engine) != 0) {
+		ret = EXIT_FAILURE;
+		goto cleanup;
 	}
+
 	drop_capabilities();
+
 	if (engine_start(&engine) != 0) {
 		ret = EXIT_FAILURE;
 		goto cleanup;