Method startNewLogFile

clientupdate/clientupdate_windows.go:309–322

startNewLogFile returns a name for a new log file. It cleans up any old log files with the same baseNamePrefix.

(baseNamePrefix, baseNameSuffix string)

// startNewLogFile returns a name for a new log file.
// It cleans up any old log files with the same baseNamePrefix.
func (up *Updater) startNewLogFile(baseNamePrefix, baseNameSuffix string) string {
	baseName := fmt.Sprintf("%s-%s-%s.log", baseNamePrefix,
		time.Now().Format("20060102T150405"), baseNameSuffix)

	dir := filepath.Join(os.Getenv("ProgramData"), "Tailscale", "Logs")
	if err := os.MkdirAll(dir, 0700); err != nil {
		up.Logf("failed to create log directory: %v", err)
		return filepath.Join(os.TempDir(), baseName)
	}

	// TODO(nickkhyl): preserve up to N old log files?
	up.cleanupOldDownloads(filepath.Join(dir, baseNamePrefix+"-*.log"))
	return filepath.Join(dir, baseName)
}