Method FlagSet

command/meta.go:64–81

FlagSet returns a FlagSet with Packer SDK Ui support built-in

(n string)

// FlagSet returns a FlagSet with Packer SDK Ui support built-in
func (m *Meta) FlagSet(n string) *flag.FlagSet {
	f := flag.NewFlagSet(n, flag.ContinueOnError)

	// Create an io.Writer that writes to our Ui properly for errors.
	// This is kind of a hack, but it does the job. Basically: create
	// a pipe, use a scanner to break it into lines, and output each line
	// to the UI. Do this forever.
	errR, errW := io.Pipe()
	errScanner := bufio.NewScanner(errR)
	go func() {
		for errScanner.Scan() {
			m.Ui.Error(errScanner.Text())
		}
	}()
	f.SetOutput(errW)

	return f
}

// ValidateFlags should be called after parsing flags to validate the
// given flags