Function validateLogFileOutput

base/logging_config.go:304–336

validateLogFileOutput ensures the given file has permission to be written to.

(logFileOutput string)

// validateLogFileOutput ensures the given file has permission to be written to.
func validateLogFileOutput(logFileOutput string) error {
	if logFileOutput == "" {
		return fmt.Errorf("empty log file output")
	}

	// Validate containing directory
	logFileOutputDirectory := filepath.Dir(logFileOutput)
	// Make full directory structure if it doesn't already exist
	err := os.MkdirAll(logFileOutputDirectory, 0700)
	if err != nil {
		return errors.Wrap(err, ErrInvalidLogFilePath.Error())
	}

	// Ensure LogFilePath is a directory. We'll check file permissions when it opens/creates the logfile.
	if f, err := os.Stat(logFileOutputDirectory); err != nil {
		return errors.Wrap(err, ErrInvalidLogFilePath.Error())
	} else if !f.IsDir() {
		return errors.Wrap(ErrInvalidLogFilePath, "not a directory")
	}

	// Validate given file is writeable by touching it.
	// If the file does not exist, this will open a zero sized log file intentionally to set permissions.
	// The permissions will then be used by lumberjack. Otherwise, lumberjack will use 0600 permissions.
	file, err := os.OpenFile(logFileOutput, os.O_WRONLY|os.O_CREATE, logFilePermission)
	if err != nil {
		if os.IsPermission(err) {
			return errors.Wrap(err, "invalid file output")
		}
		return err
	}

	return file.Close()
}

// nilAllNonConsoleLoggers will nil out all loggers except the console logger.
func nilAllNonConsoleLoggers() {