[Minor] Allow to add additional paths to plugins

Issue: #2848

src/libserver/cfg_rcl.c

@@ -845,6 +845,7 @@ rspamd_rcl_lua_handler (rspamd_mempool_t *pool, const ucl_object_t *obj,
 gboolean
 rspamd_rcl_add_lua_plugins_path (struct rspamd_config *cfg,
 		const gchar *path,
+		gboolean main_path,
 		GHashTable *modules_seen,
 		GError **err)
 {
@@ -856,7 +857,7 @@ rspamd_rcl_add_lua_plugins_path (struct rspamd_config *cfg,
 
 	if (stat (path, &st) == -1) {
 
-		if (errno != ENOENT) {
+		if (errno != ENOENT || main_path) {
 			g_set_error (err,
 					CFG_RCL_ERROR,
 					errno,
@@ -866,7 +867,7 @@ rspamd_rcl_add_lua_plugins_path (struct rspamd_config *cfg,
 			return FALSE;
 		}
 		else {
-			msg_info_config ("plugins path %s is absent, skip it", path);
+			msg_debug_config ("optional plugins path %s is absent, skip it", path);
 
 			return TRUE;
 		}
@@ -986,6 +987,7 @@ rspamd_rcl_modules_handler (rspamd_mempool_t *pool, const ucl_object_t *obj,
 				if (ucl_object_tostring_safe (cur, &data)) {
 					if (!rspamd_rcl_add_lua_plugins_path (cfg,
 							rspamd_mempool_strdup (cfg->cfg_pool, data),
+							TRUE,
 							mods_seen,
 							err)) {
 						return FALSE;
@@ -1008,6 +1010,23 @@ rspamd_rcl_modules_handler (rspamd_mempool_t *pool, const ucl_object_t *obj,
 				if (ucl_object_tostring_safe (cur, &data)) {
 					if (!rspamd_rcl_add_lua_plugins_path (cfg,
 							rspamd_mempool_strdup (cfg->cfg_pool, data),
+							FALSE,
+							mods_seen,
+							err)) {
+						return FALSE;
+					}
+				}
+			}
+		}
+
+		val = ucl_object_lookup (obj, "try_path");
+
+		if (val) {
+			LL_FOREACH (val, cur) {
+				if (ucl_object_tostring_safe (cur, &data)) {
+					if (!rspamd_rcl_add_lua_plugins_path (cfg,
+							rspamd_mempool_strdup (cfg->cfg_pool, data),
+							FALSE,
 							mods_seen,
 							err)) {
 						return FALSE;
@@ -1018,7 +1037,7 @@ rspamd_rcl_modules_handler (rspamd_mempool_t *pool, const ucl_object_t *obj,
 	}
 	else if (ucl_object_tostring_safe (obj, &data)) {
 		if (!rspamd_rcl_add_lua_plugins_path (cfg,
-				rspamd_mempool_strdup (cfg->cfg_pool, data), NULL, err)) {
+				rspamd_mempool_strdup (cfg->cfg_pool, data), TRUE, NULL, err)) {
 			return FALSE;
 		}
 	}

src/libserver/cfg_rcl.h

@@ -445,6 +445,7 @@ ucl_object_t *rspamd_rcl_add_doc_by_example (struct rspamd_config *cfg,
  */
 gboolean rspamd_rcl_add_lua_plugins_path (struct rspamd_config *cfg,
 		const gchar *path,
+		gboolean main_path,
 		GHashTable *modules_seen,
 		GError **err);
 

src/libstat/backends/sqlite3_backend.c

@@ -554,7 +554,7 @@ rspamd_sqlite3_init (struct rspamd_stat_ctx *ctx,
 
 	if ((bk = rspamd_sqlite3_opendb (cfg->cfg_pool, stf, filename,
 			stf->opts, TRUE, &err)) == NULL) {
-		msg_err_config ("cannot open sqlite3 db: %e", err);
+		msg_err_config ("cannot open sqlite3 db %s: %e", filename, err);
 		g_error_free (err);
 		return NULL;
 	}

src/rspamadm/confighelp.c

@@ -234,7 +234,7 @@ rspamadm_confighelp (gint argc, gchar **argv, const struct rspamadm_command *cmd
 	rspamd_rcl_config_init (cfg, NULL);
 	lua_pushboolean (cfg->lua_state, true);
 	lua_setglobal (cfg->lua_state, "confighelp");
-	rspamd_rcl_add_lua_plugins_path (cfg, plugins_path, NULL, NULL);
+	rspamd_rcl_add_lua_plugins_path (cfg, plugins_path, FALSE, NULL, NULL);
 
 	/* Init modules to get documentation strings */
 	i = 0;