Make config framework able to reload module configs with multiple config files.

The config framework is supposed to be able to load configs that come from
multiple config files.  The principle example is chan_sip's sip.conf and
users.conf.  Unfortunately, it only does this correctly on initial load.
This patch causes the module's config to be reloaded entirely if any of
the config files change.

(closes issue ASTERISK-22009)
Reported by: Richard Mudgett

Review: https://reviewboard.asterisk.org/r/2859/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@399352 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/config_options.c

@@ -184,7 +184,7 @@ static int link_option_to_types(struct aco_info *info, struct aco_type **types,
 		}
 		if (!ao2_link(type->internal->opts, opt)
 #ifdef AST_XML_DOCS
-				|| (!info->hidden && 
+				|| (!info->hidden &&
 					!opt->no_doc &&
 					xmldoc_update_config_option(types, info->module, opt->name, type->name, opt->default_val, opt->match_type == ACO_REGEX, opt->type))
 #endif /* AST_XML_DOCS */
@@ -592,16 +592,17 @@ enum aco_process_status aco_process_config(struct aco_info *info, int reload)
 {
 	struct ast_config *cfg;
 	struct ast_flags cfg_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0, };
-	int res = ACO_PROCESS_OK, x = 0;
+	int res = ACO_PROCESS_OK;
+	int file_count = 0;
 	struct aco_file *file;
 
-	if (!(info->files[0])) {
-		ast_log(LOG_ERROR, "No filename given, cannot proceed!\n");
+	if (!info->internal) {
+		ast_log(LOG_ERROR, "Attempting to process uninitialized aco_info\n");
 		return ACO_PROCESS_ERROR;
 	}
 
-	if (!info->internal) {
-		ast_log(LOG_ERROR, "Attempting to process uninitialized aco_info\n");
+	if (!(info->files[0])) {
+		ast_log(LOG_ERROR, "No filename given, cannot proceed!\n");
 		return ACO_PROCESS_ERROR;
 	}
 
@@ -610,16 +611,12 @@ enum aco_process_status aco_process_config(struct aco_info *info, int reload)
 		return ACO_PROCESS_ERROR;
 	}
 
-/*
- * XXX ASTERISK-22009 must fix config framework loading of multiple files.
- *
- * A reload with multiple files must reload all files if any
- * file has been touched.
- */
-	while (res != ACO_PROCESS_ERROR && (file = info->files[x++])) {
+	while (res != ACO_PROCESS_ERROR && (file = info->files[file_count++])) {
 		const char *filename = file->filename;
+
 try_alias:
-		if (!(cfg = ast_config_load(filename, cfg_flags))) {
+		cfg = ast_config_load(filename, cfg_flags);
+		if (!cfg || cfg == CONFIG_STATUS_FILEMISSING) {
 			if (file->alias && strcmp(file->alias, filename)) {
 				filename = file->alias;
 				goto try_alias;
@@ -632,20 +629,30 @@ try_alias:
 			res = ACO_PROCESS_UNCHANGED;
 			continue;
 		} else if (cfg == CONFIG_STATUS_FILEINVALID) {
-			ast_log(LOG_ERROR, "Contents of %s are invalid and cannot be parsed\n", file->filename);
-			res = ACO_PROCESS_ERROR;
-			break;
-		} else if (cfg == CONFIG_STATUS_FILEMISSING) {
-			if (file->alias && strcmp(file->alias, filename)) {
-				filename = file->alias;
-				goto try_alias;
-			}
-			ast_log(LOG_ERROR, "%s is missing! Cannot load %s\n", file->filename, info->module);
+			ast_log(LOG_ERROR, "Contents of %s are invalid and cannot be parsed\n",
+				file->filename);
 			res = ACO_PROCESS_ERROR;
 			break;
 		}
 
-		res = internal_process_ast_config(info, file, cfg);
+		/* A file got loaded. */
+		if (reload) {
+			/* Must do any subsequent file loads unconditionally. */
+			reload = 0;
+			ast_clear_flag(&cfg_flags, CONFIG_FLAG_FILEUNCHANGED);
+
+			if (file_count != 1) {
+				/*
+				 * Must restart loading to load all config files since a file
+				 * after the first one changed.
+				 */
+				file_count = 0;
+			} else {
+				res = internal_process_ast_config(info, file, cfg);
+			}
+		} else {
+			res = internal_process_ast_config(info, file, cfg);
+		}
 		ast_config_destroy(cfg);
 	}
 
@@ -653,7 +660,7 @@ try_alias:
 		goto end;
 	}
 
-	if (info->pre_apply_config && (info->pre_apply_config())) {
+	if (info->pre_apply_config && info->pre_apply_config()) {
 		res = ACO_PROCESS_ERROR;
 		goto end;
 	}