From e687d6beae78b980d984fdbfb518c494295d5200 Mon Sep 17 00:00:00 2001
From: unknown <jimw@mysql.com>
Date: Wed, 13 Apr 2005 18:25:31 -0700
Subject: [PATCH] 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 | 14 ++++++++++++++
 sql/handler.h  |  1 +
 sql/mysqld.cc  | 12 ++++++++++++
 3 files changed, 27 insertions(+)

diff --git a/sql/handler.cc b/sql/handler.cc
index b12032ccd81..7d8fc5d8110 100644
--- a/sql/handler.cc
+++ b/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)
diff --git a/sql/handler.h b/sql/handler.h
index 4c31da6a492..d2f77c4149a 100644
--- a/sql/handler.h
+++ b/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,
diff --git a/sql/mysqld.cc b/sql/mysqld.cc
index b568b75fbad..41e3069a6c0 100644
--- a/sql/mysqld.cc
+++ b/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);