Golang DockerConn.Write方法代碼示例

// 'docker login': login / register a user to registry service.
func (srv *Server) CmdLogin(stdin io.ReadCloser, stdout rcli.DockerConn, args ...string) error {
	// Read a line on raw terminal with support for simple backspace
	// sequences and echo.
	//
	// This function is necessary because the login command must be done in a
	// raw terminal for two reasons:
	// - we have to read a password (without echoing it);
	// - the rcli "protocol" only supports cannonical and raw modes and you
	//   can't tune it once the command as been started.
	var readStringOnRawTerminal = func(stdin io.Reader, stdout io.Writer, echo bool) string {
		char := make([]byte, 1)
		buffer := make([]byte, 64)
		var i = 0
		for i < len(buffer) {
			n, err := stdin.Read(char)
			if n > 0 {
				if char[0] == '\r' || char[0] == '\n' {
					stdout.Write([]byte{'\r', '\n'})
					break
				} else if char[0] == 127 || char[0] == '\b' {
					if i > 0 {
						if echo {
							stdout.Write([]byte{'\b', ' ', '\b'})
						}
						i--
					}
				} else if !unicode.IsSpace(rune(char[0])) &&
					!unicode.IsControl(rune(char[0])) {
					if echo {
						stdout.Write(char)
					}
					buffer[i] = char[0]
					i++
				}
			}
			if err != nil {
				if err != io.EOF {
					fmt.Fprintf(stdout, "Read error: %v\r\n", err)
				}
				break
			}
		}
		return string(buffer[:i])
	}
	var readAndEchoString = func(stdin io.Reader, stdout io.Writer) string {
		return readStringOnRawTerminal(stdin, stdout, true)
	}
	var readString = func(stdin io.Reader, stdout io.Writer) string {
		return readStringOnRawTerminal(stdin, stdout, false)
	}

	stdout.SetOptionRawTerminal()

	cmd := rcli.Subcmd(stdout, "login", "", "Register or Login to the docker registry server")
	if err := cmd.Parse(args); err != nil {
		return nil
	}

	var username string
	var password string
	var email string

	fmt.Fprint(stdout, "Username (", srv.runtime.authConfig.Username, "): ")
	username = readAndEchoString(stdin, stdout)
	if username == "" {
		username = srv.runtime.authConfig.Username
	}
	if username != srv.runtime.authConfig.Username {
		fmt.Fprint(stdout, "Password: ")
		password = readString(stdin, stdout)

		if password == "" {
			return fmt.Errorf("Error : Password Required")
		}

		fmt.Fprint(stdout, "Email (", srv.runtime.authConfig.Email, "): ")
		email = readAndEchoString(stdin, stdout)
		if email == "" {
			email = srv.runtime.authConfig.Email
		}
	} else {
		password = srv.runtime.authConfig.Password
		email = srv.runtime.authConfig.Email
	}
	newAuthConfig := auth.NewAuthConfig(username, password, email, srv.runtime.root)
	status, err := auth.Login(newAuthConfig)
	if err != nil {
		fmt.Fprintf(stdout, "Error: %s\r\n", err)
	} else {
		srv.runtime.authConfig = newAuthConfig
	}
	if status != "" {
		fmt.Fprint(stdout, status)
	}
	return nil
}