Add @@version_comment

Author: timvaillancourt

go/logic/applier.go

@@ -98,8 +98,10 @@ func (this *Applier) InitDBConnections() (err error) {
 	if err := this.readTableColumns(); err != nil {
 		return err
 	}
-	this.migrationContext.Log.Infof("Applier initiated on %+v, version %+v", this.connectionConfig.ImpliedKey,
-		this.migrationContext.ApplierServerInfo.Version)
+	this.migrationContext.Log.Infof("Applier initiated on %+v, version %+v (%+v)", this.connectionConfig.ImpliedKey,
+		this.migrationContext.ApplierServerInfo.Version,
+		this.migrationContext.ApplierServerInfo.VersionComment,
+	)
 	return nil
 }
 

go/mysql/server_info.go

@@ -5,6 +5,7 @@ import gosql "database/sql"
 // ServerInfo represents the online config of a MySQL server.
 type ServerInfo struct {
 	Version         string
+	VersionComment  string
 	Hostname        string
 	Port            gosql.NullInt64
 	BinlogFormat    string
@@ -22,13 +23,12 @@ type ServerInfo struct {
 // the online config of a MySQL server.
 func GetServerInfo(db *gosql.DB) (*ServerInfo, error) {
 	var info ServerInfo
-	query := `select /* gh-ost */ @@global.version, @@global.hostname, @@global.port,
-		@@global.binlog_format, @@global.binlog_row_image, @@global.log_bin,
+	query := `select /* gh-ost */ @@global.version, @@global.version_comment, @@global.hostname,
+		@@global.port, @@global.binlog_format, @@global.binlog_row_image, @@global.log_bin,
 		@@global.log_slave_updates, @@global.sql_mode, @@global.time_zone`
-	if err := db.QueryRow(query).Scan(&info.Version, &info.Hostname,
-		&info.Port, &info.BinlogFormat, &info.BinlogRowImage,
-		&info.LogBin, &info.LogSlaveUpdates, &info.SQLMode,
-		&info.TimeZone,
+	if err := db.QueryRow(query).Scan(&info.Version, &info.VersionComment, &info.Hostname,
+		&info.Port, &info.BinlogFormat, &info.BinlogRowImage, &info.LogBin,
+		&info.LogSlaveUpdates, &info.SQLMode, &info.TimeZone,
 	); err != nil {
 		return nil, err
 	}