Check that the default storage engine is really available, and

refuse to start up if it is not. (Bug #9815)


sql/handler.cc:
  Add ha_storage_engine_is_enabled function.
sql/handler.h:
  Declare ha_storage_engine_is_enabled()
sql/mysqld.cc:
  Abort startup if the specified default storage engine is
  not available.

sql/handler.cc

@@ -145,6 +145,20 @@ const char *ha_get_storage_engine(enum db_type db_type)
   return "none";
 }
 
+
+my_bool ha_storage_engine_is_enabled(enum db_type database_type)
+{
+  show_table_type_st *types;
+  for (types= sys_table_types; types->type; types++)
+  {
+    if ((database_type == types->db_type) &&
+	(*types->value == SHOW_OPTION_YES))
+      return TRUE;
+  }
+  return FALSE;
+}
+
+
 	/* Use other database handler if databasehandler is not incompiled */
 
 enum db_type ha_checktype(enum db_type database_type)

sql/handler.h

@@ -542,6 +542,7 @@ int ha_init(void);
 int ha_panic(enum ha_panic_function flag);
 void ha_close_connection(THD* thd);
 enum db_type ha_checktype(enum db_type database_type);
+my_bool ha_storage_engine_is_enabled(enum db_type database_type);
 int ha_create_table(const char *name, HA_CREATE_INFO *create_info,
 		    bool update_create_info);
 int ha_create_table_from_engine(THD* thd, const char *db, const char *name,

sql/mysqld.cc

@@ -6435,6 +6435,18 @@ static void get_options(int argc,char **argv)
     sql_print_warning("this binary does not contain BDB storage engine");
 #endif
 
+  /*
+    Check that the default storage engine is actually available.
+  */
+  if (!ha_storage_engine_is_enabled((enum db_type)
+                                    global_system_variables.table_type))
+  {
+    sql_print_error("Default storage engine (%s) is not available",
+                    ha_get_storage_engine((enum db_type)
+                                          global_system_variables.table_type));
+    exit(1);
+  }
+
   if (argc > 0)
   {
     fprintf(stderr, "%s: Too many arguments (first extra is '%s').\nUse --help to get a list of available options\n", my_progname, *argv);