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package fs
import (
// LogLevel describes rclone's logs. These are a subset of the syslog log levels.
type LogLevel byte
// Log levels. These are the syslog levels of which we only use a
// subset.
// LOG_EMERG system is unusable
// LOG_ALERT action must be taken immediately
// LOG_CRIT critical conditions
// LOG_ERR error conditions
// LOG_WARNING warning conditions
// LOG_NOTICE normal, but significant, condition
// LOG_INFO informational message
// LOG_DEBUG debug-level message
const (
LogLevelEmergency LogLevel = iota
LogLevelError // Error - can't be suppressed
LogLevelNotice // Normal logging, -q suppresses
LogLevelInfo // Transfers, needs -v
LogLevelDebug // Debug level, needs -vv
var logLevelToString = []string{
LogLevelEmergency: "EMERGENCY",
LogLevelAlert: "ALERT",
LogLevelCritical: "CRITICAL",
LogLevelError: "ERROR",
LogLevelWarning: "WARNING",
LogLevelNotice: "NOTICE",
LogLevelInfo: "INFO",
LogLevelDebug: "DEBUG",
// String turns a LogLevel into a string
func (l LogLevel) String() string {
if l >= LogLevel(len(logLevelToString)) {
return fmt.Sprintf("LogLevel(%d)", l)
return logLevelToString[l]
// Set a LogLevel
func (l *LogLevel) Set(s string) error {
for n, name := range logLevelToString {
if s != "" && name == s {
*l = LogLevel(n)
return nil
return errors.Errorf("Unknown log level %q", s)
// Type of the value
func (l *LogLevel) Type() string {
return "string"
// LogPrint sends the text to the logger of level
var LogPrint = func(level LogLevel, text string) {
text = fmt.Sprintf("%-6s: %s", level, text)
_ = log.Output(4, text)
// LogPrintf produces a log string from the arguments passed in
func LogPrintf(level LogLevel, o interface{}, text string, args ...interface{}) {
out := fmt.Sprintf(text, args...)
if o != nil {
out = fmt.Sprintf("%v: %s", o, out)
LogPrint(level, out)
// LogLevelPrintf writes logs at the given level
func LogLevelPrintf(level LogLevel, o interface{}, text string, args ...interface{}) {
if Config.LogLevel >= level {
LogPrintf(level, o, text, args...)
// Errorf writes error log output for this Object or Fs. It
// should always be seen by the user.
func Errorf(o interface{}, text string, args ...interface{}) {
if Config.LogLevel >= LogLevelError {
LogPrintf(LogLevelError, o, text, args...)
// Logf writes log output for this Object or Fs. This should be
// considered to be Info level logging. It is the default level. By
// default rclone should not log very much so only use this for
// important things the user should see. The user can filter these
// out with the -q flag.
func Logf(o interface{}, text string, args ...interface{}) {
if Config.LogLevel >= LogLevelNotice {
LogPrintf(LogLevelNotice, o, text, args...)
// Infof writes info on transfers for this Object or Fs. Use this
// level for logging transfers, deletions and things which should
// appear with the -v flag.
func Infof(o interface{}, text string, args ...interface{}) {
if Config.LogLevel >= LogLevelInfo {
LogPrintf(LogLevelInfo, o, text, args...)
// Debugf writes debugging output for this Object or Fs. Use this for
// debug only. The user must have to specify -vv to see this.
func Debugf(o interface{}, text string, args ...interface{}) {
if Config.LogLevel >= LogLevelDebug {
LogPrintf(LogLevelDebug, o, text, args...)
// LogDirName returns an object for the logger, logging a root
// directory which would normally be "" as the Fs
func LogDirName(f Fs, dir string) interface{} {
if dir != "" {
return dir
return f
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