MDEV-7067: Server outputs Galera (WSREP) information, even if Galera is disabled

* mysqld_safe: Since wsrep_on variable is mandatory in 10.1, skip wsrep
position recovery if its OFF.
* mysqld: Remove "-wsrep" from server version
* mysqld: Remove wsrep patch version from @@version_comment
* mysqld: Introduce @@wsrep_patch_version

cmake/wsrep.cmake

@@ -28,29 +28,17 @@ OPTION(WITH_WSREP "WSREP replication API (to use, e.g. Galera Replication librar
 # Set the patch version
 SET(WSREP_PATCH_VERSION "10")
 
-# MariaDB addition: Revision number of the last revision merged from
-# codership branch visible in @@version_comment.
-# Branch : codership-mysql/5.6
-SET(WSREP_PATCH_REVNO "4144")  # Should be updated on every merge.
-
-# MariaDB addition: Revision number of the last revision merged from
-# Branch : lp:maria/maria-10.0-galera
-SET(WSREP_PATCH_REVNO2 "3919")  # Should be updated on every merge.
-
-# MariaDB: Obtain patch revision number:
-# Update WSREP_PATCH_REVNO if WSREP_REV environment variable is set.
-IF (DEFINED ENV{WSREP_REV})
-  SET(WSREP_PATCH_REVNO $ENV{WSREP_REV})
-ENDIF()
-
-SET(WSREP_INTERFACE_VERSION 25)
+# Obtain wsrep API version
+FILE(STRINGS "${MySQL_SOURCE_DIR}/wsrep/wsrep_api.h" WSREP_API_VERSION
+     LIMIT_COUNT 1 REGEX "WSREP_INTERFACE_VERSION")
+STRING(REGEX MATCH "([0-9]+)" WSREP_API_VERSION "${WSREP_API_VERSION}")
 
-SET(WSREP_VERSION
-    "${WSREP_INTERFACE_VERSION}.${WSREP_PATCH_VERSION}.r${WSREP_PATCH_REVNO}")
+SET(WSREP_VERSION "${WSREP_API_VERSION}.${WSREP_PATCH_VERSION}"
+    CACHE INTERNAL "WSREP version")
 
 SET(WSREP_PROC_INFO ${WITH_WSREP})
 
 IF(WITH_WSREP)
-  SET(COMPILATION_COMMENT "${COMPILATION_COMMENT}, wsrep_${WSREP_VERSION}")
+  SET(WSREP_PATCH_VERSION "wsrep_${WSREP_VERSION}")
 ENDIF()
 

include/mysql_version.h.in

@@ -23,6 +23,10 @@
 #define MYSQL_CONFIG_NAME		"my"
 #define MYSQL_COMPILATION_COMMENT	"@COMPILATION_COMMENT@"
 
+#ifdef WITH_WSREP
+#define WSREP_PATCH_VERSION             "@WSREP_PATCH_VERSION@"
+#endif
+
 /* mysqld compile time options */
 #endif /* _CUSTOMCONFIG_ */
 

mysql-test/suite/sys_vars/r/sysvars_wsrep.result

@@ -365,6 +365,20 @@ NUMERIC_BLOCK_SIZE	NULL
 ENUM_VALUE_LIST	TOI,RSU
 READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	OPTIONAL
+VARIABLE_NAME	WSREP_PATCH_VERSION
+SESSION_VALUE	NULL
+GLOBAL_VALUE	wsrep_25.10
+GLOBAL_VALUE_ORIGIN	COMPILE-TIME
+DEFAULT_VALUE	NULL
+VARIABLE_SCOPE	GLOBAL
+VARIABLE_TYPE	VARCHAR
+VARIABLE_COMMENT	wsrep patch version
+NUMERIC_MIN_VALUE	NULL
+NUMERIC_MAX_VALUE	NULL
+NUMERIC_BLOCK_SIZE	NULL
+ENUM_VALUE_LIST	NULL
+READ_ONLY	YES
+COMMAND_LINE_ARGUMENT	NULL
 VARIABLE_NAME	WSREP_PROVIDER
 SESSION_VALUE	NULL
 GLOBAL_VALUE	none

scripts/mysqld_safe.sh

@@ -20,6 +20,7 @@ mysqld_ld_preload=
 mysqld_ld_library_path=
 flush_caches=0
 numa_interleave=0
+wsrep_on=0
 
 # Initial logging status: error log is not open, and not using syslog
 logging=init
@@ -319,6 +320,15 @@ parse_arguments() {
       --timezone=*) TZ="$val"; export TZ; ;;
       --flush[-_]caches) flush_caches=1 ;;
       --numa[-_]interleave) numa_interleave=1 ;;
+      --wsrep[-_]on) wsrep_on=1 ;;
+      --skip[-_]wsrep[-_]on) wsrep_on=0 ;;
+      --wsrep[-_]on=*)
+        if echo $val | grep -iq '\(ON\|1\)'; then
+          wsrep_on=1
+        else
+          wsrep_on=0
+        fi
+        ;;
       --wsrep[-_]urls=*) wsrep_urls="$val"; ;;
       --wsrep[-_]provider=*)
         if test -n "$val" && test "$val" != "none"
@@ -968,6 +978,9 @@ do
 
   start_time=`date +%M%S`
 
+  # Perform wsrep position recovery if wsrep_on=1, skip otherwise.
+  if test $wsrep_on -eq 1
+  then
     # this sets wsrep_start_position_opt
     wsrep_recover_position "$cmd"
 
@@ -981,6 +994,9 @@ do
     else
       eval_log_error "$cmd $wsrep_start_position_opt --wsrep_cluster_address=$url"
     fi
+  else
+    eval_log_error "$cmd"
+  fi
 
   if [ $want_syslog -eq 0 -a ! -f "$err_log" ]; then
     touch "$err_log"                    # hypothetical: log was renamed but not

sql/mysqld.cc

@@ -1900,7 +1900,7 @@ static void __cdecl kill_server(int sig_ptr)
   }
 #endif
 
-  if (WSREP_ON)
+  /* Stop wsrep threads in case they are running. */
   wsrep_stop_replication(NULL);
 
   close_connections();
@@ -1908,6 +1908,8 @@ static void __cdecl kill_server(int sig_ptr)
   if (wsrep_inited == 1)
     wsrep_deinit(true);
 
+  wsrep_thr_deinit();
+
   if (sig != MYSQL_KILL_SIGNAL &&
       sig != 0)
     unireg_abort(1);				/* purecov: inspected */
@@ -4980,7 +4982,14 @@ a file name for --log-bin-index option", opt_binlog_index_name);
       since SST may need it
     - SST may modify binlog index file, so it must be opened
       after SST has happened
+
+    We also (unconditionally) initialize wsrep LOCKs and CONDs.
+    It is because they are used while accessing wsrep system
+    variables even when a wsrep provider is not loaded.
   */
+
+  wsrep_thr_init();
+
   if (WSREP_ON && !wsrep_recovery && !opt_abort) /* WSREP BEFORE SE */
   {
     if (opt_bootstrap) // bootsrap option given - disable wsrep functionality
@@ -9425,9 +9434,6 @@ void set_server_version(void)
 #ifdef EMBEDDED_LIBRARY
   end= strmov(end, "-embedded");
 #endif
-#ifdef WITH_WSREP
-  end= strmov(end, "-wsrep");
-#endif
 #ifndef DBUG_OFF
   if (!strstr(MYSQL_SERVER_SUFFIX_STR, "-debug"))
     end= strmov(end, "-debug");

sql/sys_vars.cc

@@ -4857,6 +4857,12 @@ static Sys_var_mybool Sys_wsrep_gtid_mode(
        "ignored (backward compatibility).",
        GLOBAL_VAR(wsrep_gtid_mode), CMD_LINE(OPT_ARG), DEFAULT(FALSE));
 
+static char *wsrep_patch_version_ptr;
+static Sys_var_charptr Sys_wsrep_patch_version(
+       "wsrep_patch_version", "wsrep patch version",
+       READ_ONLY GLOBAL_VAR(wsrep_patch_version_ptr), CMD_LINE_HELP_ONLY,
+       IN_SYSTEM_CHARSET, DEFAULT(WSREP_PATCH_VERSION));
+
 #endif /* WITH_WSREP */
 
 static bool fix_host_cache_size(sys_var *, THD *, enum_var_type)

sql/wsrep_mysqld.cc

@@ -617,25 +617,6 @@ int wsrep_init()
 
   wsrep_causal_reads_update(&global_system_variables);
 
-  mysql_mutex_register("sql", wsrep_mutexes, array_elements(wsrep_mutexes));
-  mysql_cond_register("sql", wsrep_conds, array_elements(wsrep_conds));
-
-  mysql_mutex_init(key_LOCK_wsrep_ready, &LOCK_wsrep_ready, MY_MUTEX_INIT_FAST);
-  mysql_cond_init(key_COND_wsrep_ready, &COND_wsrep_ready, NULL);
-  mysql_mutex_init(key_LOCK_wsrep_sst, &LOCK_wsrep_sst, MY_MUTEX_INIT_FAST);
-  mysql_cond_init(key_COND_wsrep_sst, &COND_wsrep_sst, NULL);
-  mysql_mutex_init(key_LOCK_wsrep_sst_init, &LOCK_wsrep_sst_init, MY_MUTEX_INIT_FAST);
-  mysql_cond_init(key_COND_wsrep_sst_init, &COND_wsrep_sst_init, NULL);
-  mysql_mutex_init(key_LOCK_wsrep_rollback, &LOCK_wsrep_rollback, MY_MUTEX_INIT_FAST);
-  mysql_cond_init(key_COND_wsrep_rollback, &COND_wsrep_rollback, NULL);
-  mysql_mutex_init(key_LOCK_wsrep_replaying, &LOCK_wsrep_replaying, MY_MUTEX_INIT_FAST);
-  mysql_cond_init(key_COND_wsrep_replaying, &COND_wsrep_replaying, NULL);
-  mysql_mutex_init(key_LOCK_wsrep_slave_threads, &LOCK_wsrep_slave_threads, MY_MUTEX_INIT_FAST);
-  mysql_mutex_init(key_LOCK_wsrep_desync, &LOCK_wsrep_desync, MY_MUTEX_INIT_FAST);
-  mysql_mutex_init(key_LOCK_wsrep_config_state, &LOCK_wsrep_config_state, MY_MUTEX_INIT_FAST);
-
-  mysql_file_register("sql", wsrep_files, array_elements(wsrep_files));
-
   wsrep_ready_set(FALSE);
   assert(wsrep_provider);
 
@@ -826,6 +807,31 @@ int wsrep_init()
   return rcode;
 }
 
+
+/* Initialize wsrep thread LOCKs and CONDs */
+void wsrep_thr_init()
+{
+  mysql_mutex_register("sql", wsrep_mutexes, array_elements(wsrep_mutexes));
+  mysql_cond_register("sql", wsrep_conds, array_elements(wsrep_conds));
+
+  mysql_mutex_init(key_LOCK_wsrep_ready, &LOCK_wsrep_ready, MY_MUTEX_INIT_FAST);
+  mysql_cond_init(key_COND_wsrep_ready, &COND_wsrep_ready, NULL);
+  mysql_mutex_init(key_LOCK_wsrep_sst, &LOCK_wsrep_sst, MY_MUTEX_INIT_FAST);
+  mysql_cond_init(key_COND_wsrep_sst, &COND_wsrep_sst, NULL);
+  mysql_mutex_init(key_LOCK_wsrep_sst_init, &LOCK_wsrep_sst_init, MY_MUTEX_INIT_FAST);
+  mysql_cond_init(key_COND_wsrep_sst_init, &COND_wsrep_sst_init, NULL);
+  mysql_mutex_init(key_LOCK_wsrep_rollback, &LOCK_wsrep_rollback, MY_MUTEX_INIT_FAST);
+  mysql_cond_init(key_COND_wsrep_rollback, &COND_wsrep_rollback, NULL);
+  mysql_mutex_init(key_LOCK_wsrep_replaying, &LOCK_wsrep_replaying, MY_MUTEX_INIT_FAST);
+  mysql_cond_init(key_COND_wsrep_replaying, &COND_wsrep_replaying, NULL);
+  mysql_mutex_init(key_LOCK_wsrep_slave_threads, &LOCK_wsrep_slave_threads, MY_MUTEX_INIT_FAST);
+  mysql_mutex_init(key_LOCK_wsrep_desync, &LOCK_wsrep_desync, MY_MUTEX_INIT_FAST);
+  mysql_mutex_init(key_LOCK_wsrep_config_state, &LOCK_wsrep_config_state, MY_MUTEX_INIT_FAST);
+
+  mysql_file_register("sql", wsrep_files, array_elements(wsrep_files));
+}
+
+
 void wsrep_init_startup (bool first)
 {
   if (wsrep_init()) unireg_abort(1);
@@ -864,7 +870,11 @@ void wsrep_deinit(bool free_options)
   {
     wsrep_sst_auth_free();
   }
+}
 
+/* Destroy wsrep thread LOCKs and CONDs */
+void wsrep_thr_deinit()
+{
   mysql_mutex_destroy(&LOCK_wsrep_ready);
   mysql_cond_destroy(&COND_wsrep_ready);
   mysql_mutex_destroy(&LOCK_wsrep_sst);
@@ -882,10 +892,11 @@ void wsrep_deinit(bool free_options)
 
 void wsrep_recover()
 {
+  char uuid_str[40];
+
   if (!memcmp(&local_uuid, &WSREP_UUID_UNDEFINED, sizeof(wsrep_uuid_t)) &&
       local_seqno == -2)
   {
-    char uuid_str[40];
     wsrep_uuid_print(&local_uuid, uuid_str, sizeof(uuid_str));
     WSREP_INFO("Position %s:%lld given at startup, skipping position recovery",
                uuid_str, (long long)local_seqno);
@@ -895,7 +906,6 @@ void wsrep_recover()
   memset(&xid, 0, sizeof(xid));
   xid.formatID= -1;
   wsrep_get_SE_checkpoint(&xid);
-  char uuid_str[40];
   wsrep_uuid_print(wsrep_xid_uuid(&xid), uuid_str, sizeof(uuid_str));
   WSREP_INFO("Recovered position: %s:%lld", uuid_str,
              (long long)wsrep_xid_seqno(&xid));

sql/wsrep_mysqld.h

@@ -118,6 +118,12 @@ int  wsrep_show_status(THD *thd, SHOW_VAR *var, char *buff,
                        enum enum_var_type scope);
 int  wsrep_init();
 void wsrep_deinit(bool free_options);
+
+/* Initialize wsrep thread LOCKs and CONDs */
+void wsrep_thr_init();
+/* Destroy wsrep thread LOCKs and CONDs */
+void wsrep_thr_deinit();
+
 void wsrep_recover();
 bool wsrep_before_SE(); // initialize wsrep before storage
                         // engines (true) or after (false)
@@ -338,6 +344,8 @@ int wsrep_create_trigger_query(THD *thd, uchar** buf, size_t* buf_len);
 #define wsrep_recover() do { } while(0)
 #define wsrep_slave_threads (1)
 #define wsrep_replicate_myisam (0)
+#define wsrep_thr_init() do {} while(0)
+#define wsrep_thr_deinit() do {} while(0)
 
 #endif /* WITH_WSREP */
 #endif /* WSREP_MYSQLD_H */

sql/wsrep_var.cc

@@ -295,6 +295,8 @@ bool wsrep_provider_options_check(sys_var *self, THD* thd, set_var* var)
 
 bool wsrep_provider_options_update(sys_var *self, THD* thd, enum_var_type type)
 {
+  DBUG_ASSERT(wsrep != NULL);
+
   wsrep_status_t ret= wsrep->options_set(wsrep, wsrep_provider_options);
   if (ret != WSREP_OK)
   {
@@ -495,6 +497,8 @@ bool wsrep_desync_check (sys_var *self, THD* thd, set_var* var)
 
 bool wsrep_desync_update (sys_var *self, THD* thd, enum_var_type type)
 {
+  DBUG_ASSERT(wsrep != NULL);
+
   wsrep_status_t ret(WSREP_WARNING);
   if (wsrep_desync) {
     ret = wsrep->desync (wsrep);
@@ -548,6 +552,7 @@ int wsrep_show_status (THD *thd, SHOW_VAR *var, char *buff,
     *v++= wsrep_status_vars[i];
 
   DBUG_ASSERT(i < maxi);
+  DBUG_ASSERT(wsrep != NULL);
 
   wsrep_stats_var* stats= wsrep->stats_get(wsrep);
   for (wsrep_stats_var *sv= stats; i < maxi && sv && sv->name; i++, sv++, v++)