improve logger

log file size, rotation policy and compression are now configurable

main.go

@@ -28,17 +28,31 @@ func main() {
 	confName := "sftpgo.conf"
 	logSender := "main"
 	var (
-		configDir   string
-		logFilePath string
+		configDir     string
+		logFilePath   string
+		logMaxSize    int
+		logMaxBackups int
+		logMaxAge     int
+		logCompress   bool
+		logVerbose    bool
 	)
 	flag.StringVar(&configDir, "config-dir", ".", "Location for SFTPGo config dir. It must contain sftpgo.conf, "+
 		"the private key for the SFTP server (id_rsa file) and the SQLite database if you use SQLite as data provider. "+
 		"The server private key will be autogenerated if the user that executes SFTPGo has write access to the config-dir")
 	flag.StringVar(&logFilePath, "log-file-path", "sftpgo.log", "Location for the log file")
+	flag.IntVar(&logMaxSize, "log-max-size", 10, "Maximum size in megabytes of the log file before it gets rotated.")
+	flag.IntVar(&logMaxBackups, "log-max-backups", 5, "Maximum number of old log files to retain")
+	flag.IntVar(&logMaxAge, "log-max-age", 28, "Maximum number of days to retain old log files")
+	flag.BoolVar(&logCompress, "log-compress", false, "Determine if the rotated log files should be compressed using gzip")
+	flag.BoolVar(&logVerbose, "log-verbose", true, "Enable verbose logs")
 	flag.Parse()
 
 	configFilePath := filepath.Join(configDir, confName)
-	logger.InitLogger(logFilePath, zerolog.DebugLevel)
+	logLevel := zerolog.DebugLevel
+	if !logVerbose {
+		logLevel = zerolog.InfoLevel
+	}
+	logger.InitLogger(logFilePath, logMaxSize, logMaxBackups, logMaxAge, logCompress, logLevel)
 	logger.Info(logSender, "starting SFTPGo, config dir: %v", configDir)
 	config.LoadConfig(configFilePath)
 	providerConf := config.GetProviderConf()