Method listOldLogFiles

netchan/store/rotating_file_store.go:345–374

oldLogFiles returns the list of backup log files stored in the same directory as the current log file, sorted by ModTime

()

// oldLogFiles returns the list of backup log files stored in the same
// directory as the current log file, sorted by ModTime
func (l *RotatingFileStore) listOldLogFiles() ([]logInfo, error) {
	os.MkdirAll(l.dir(), 0755)
	files, err := ioutil.ReadDir(l.dir())
	if err != nil {
		return nil, fmt.Errorf("can't read log file directory: %s", err)
	}
	logFiles := []logInfo{}

	prefix, ext := l.prefixAndExt()

	for _, f := range files {
		if f.IsDir() {
			continue
		}
		name := l.timeFromName(f.Name(), prefix, ext)
		if name == "" {
			continue
		}
		t, err := time.Parse(backupTimeFormat, name)
		if err == nil {
			logFiles = append(logFiles, logInfo{t, f})
		}
		// error parsing means that the suffix at the end was not generated
		// by lumberjack, and therefore it's not a backup file.
	}

	sort.Sort(byFormatTime(logFiles))

	return logFiles, nil
}

// timeFromName extracts the formatted time from the filename by stripping off
// the filename's prefix and extension. This prevents someone's filename from