Enable foreign keys in sqlite3.

src/libserver/fuzzy_backend.c

@@ -408,7 +408,8 @@ rspamd_fuzzy_backend_open (const gchar *path, GError **err)
 	gint fd;
 	struct rspamd_fuzzy_backend *backend;
 	static const char sqlite_wal[] = "PRAGMA journal_mode=\"wal\";",
-			fallback_journal[] = "PRAGMA journal_mode=\"off\";";
+			fallback_journal[] = "PRAGMA journal_mode=\"off\";",
+			foreign_keys[] = "PRAGMA foreign_keys=\"ON\";";
 	int rc;
 
 	if (path == NULL) {
@@ -466,6 +467,11 @@ rspamd_fuzzy_backend_open (const gchar *path, GError **err)
 		sqlite3_exec (backend->db, fallback_journal, NULL, NULL, NULL);
 	}
 
+	if ((rc = sqlite3_exec (backend->db, foreign_keys, NULL, NULL, NULL)) !=
+			SQLITE_OK) {
+		msg_warn_fuzzy_backend ("foreign keys are not supported", rc);
+	}
+
 	/* Cleanup database */
 	rspamd_fuzzy_backend_run_simple (RSPAMD_FUZZY_BACKEND_VACUUM, backend, NULL);
 

src/libutil/sqlite_utils.c

@@ -249,7 +249,8 @@ rspamd_sqlite3_open_or_create (rspamd_mempool_t *pool, const gchar *path, const
 	gchar lock_path[PATH_MAX], dbdir[PATH_MAX], *pdir;
 	static const char sqlite_wal[] = "PRAGMA journal_mode=\"wal\";",
 			exclusive_lock_sql[] = "PRAGMA locking_mode=\"exclusive\";",
-			fsync_sql[] = "PRAGMA synchronous=1;";
+			fsync_sql[] = "PRAGMA synchronous=1;",
+			foreign_keys[] = "PRAGMA foreign_keys=\"ON\";";
 	gboolean create = FALSE, has_lock = FALSE;
 
 	flags = SQLITE_OPEN_READWRITE;
@@ -377,6 +378,12 @@ rspamd_sqlite3_open_or_create (rspamd_mempool_t *pool, const gchar *path, const
 				sqlite3_errmsg (sqlite));
 	}
 
+	if ((rc = sqlite3_exec (sqlite, foreign_keys, NULL, NULL, NULL)) !=
+			SQLITE_OK) {
+		msg_warn_pool ("cannot enable foreign keys: %s",
+				sqlite3_errmsg (sqlite));
+	}
+
 	if (has_lock) {
 		msg_debug_pool ("removing lock from %s", lock_path);
 		rspamd_file_unlock (lock_fd, FALSE);