bug#27708249 - PREVENT DOWNGRADE on 8.0 DATABASE INSTALLATIONS

Reviewed by: Sivert Sorunmgaard<[email protected]>

Author: Jimmy Yang

share/errmsg-utf8.txt

@@ -18038,6 +18038,8 @@ ER_STARTING_INIT
 ER_ENDING_INIT
   eng "%s (mysqld %s) initializing of server has completed"
 
+ER_IB_MSG_1272
+  eng "Cannot boot server version %lu on data directory built by version %lu. Downgrade is not supported"
 #
 # End of 8.0 Server error messages.
 # (Please read comments from the header of this section before adding error

storage/innobase/fil/fil0fil.cc

@@ -5137,12 +5137,16 @@ dberr_t fil_ibd_open(bool validate, fil_type_t purpose, space_id_t space_id,
     return (DB_ERROR);
   }
 
-#ifdef UNIV_DEBUG
   if (validate && !old_space && !for_import) {
-    ut_ad(df.server_version() == DD_SPACE_CURRENT_SRV_VERSION);
+    if (df.server_version() > DD_SPACE_CURRENT_SRV_VERSION) {
+      ib::error(ER_IB_MSG_1272, DD_SPACE_CURRENT_SRV_VERSION,
+                df.server_version());
+      /* Server version is less than the tablespace server version.
+      We don't support downgrade for 8.0 server, so report error */
+      return (DB_SERVER_VERSION_LOW);
+    }
     ut_ad(df.space_version() == DD_SPACE_CURRENT_SPACE_VERSION);
   }
-#endif /* UNIV_DEBUG */
 
   /* For encryption tablespace, initialize encryption information.*/
   if (is_encrypted && !for_import) {

storage/innobase/include/db0err.h

@@ -145,8 +145,8 @@ enum dberr_t {
   DB_CANT_CREATE_GEOMETRY_OBJECT,   /*!< Cannot create specified Geometry
                                     data object */
   DB_CANNOT_OPEN_FILE,              /*!< Cannot open a file */
-  DB_FTS_TOO_MANY_WORDS_IN_PHRASE,
-  /*!< Too many words in a phrase */
+  DB_FTS_TOO_MANY_WORDS_IN_PHRASE,  /*!< Too many words in a phrase */
+  DB_SERVER_VERSION_LOW, /* Server version is lower than tablespace version */
 
   DB_IO_ERROR = 100, /*!< Generic IO error */
 

storage/innobase/ut/ut0ut.cc

@@ -579,6 +579,11 @@ const char *ut_strerr(dberr_t num) {
     case DB_INVALID_ENCRYPTION_META:
       return ("Invalid encryption meta-data information");
 
+    case DB_SERVER_VERSION_LOW:
+      return (
+          "Cannot boot server with lower version than that built the "
+          "tablespace");
+
     case DB_ERROR_UNSET:;
       /* Fall through. */