func main() {
	var width int
	var flag uint
	args := os.Args[1:]
	for len(args) > 0 && len(args[0]) > 0 && args[0][0] == '-' {
		if len(args[0]) > 1 {
			width, _ = strconv.Atoi(args[0][1:])
		} else {
			flag |= colwriter.BreakOnColon
		}
		args = args[1:]
	}
	if width < 1 {
		_, width, _ = pty.Getsize(os.Stdout)
	}
	if width < 1 {
		width = 80
	}

	w := colwriter.NewWriter(os.Stdout, width, flag)
	if len(args) > 0 {
		for _, s := range args {
			if f, err := os.Open(s); err == nil {
				copyin(w, f)
				f.Close()
			} else {
				log.Println(err)
			}
		}
	} else {
		copyin(w, os.Stdin)
	}
}

func main() {
	heightInt, widthInt, _ := pty.Getsize(os.Stdout)

	var width uint
	var height uint

	// The three subtracted lines is to have room for command, file name and prompt after explosion
	flag.UintVar(&width, "w", uint(widthInt), "Maximum width of output in number of columns")
	flag.UintVar(&height, "h", uint((heightInt-3)*2), "Maximum height of output in number of half lines")
	flag.Usage = func() {
		fmt.Fprintf(os.Stderr, "Usage: %s [options] [file | - ...]\n\n", os.Args[0])
		fmt.Fprintln(os.Stderr, "  Specify \"-\" or just noting to read from stdin.")
		fmt.Fprintln(os.Stderr)
		fmt.Fprintln(os.Stderr, "Options:")
		flag.PrintDefaults()
	}
	flag.Parse()

	filenames := flag.Args()
	if len(filenames) == 0 {
		fmt.Println("stdin:")
		sourceImage, _, err := image.Decode(os.Stdin)
		if err != nil {
			fmt.Fprintln(os.Stderr, "Error:", err)
		} else {
			printImage(sourceImage, width, height)
		}
	} else {
		for i, filename := range filenames {
			if i > 0 {
				fmt.Println()
			}

			var file *os.File
			var err error

			if filename == "-" {
				fmt.Println("stdin:")
				file = os.Stdin
			} else {
				fmt.Printf("%s:\n", filename)
				file, err = os.Open(filename)
				if err != nil {
					fmt.Fprintln(os.Stderr, "Error:", err)
					continue
				}
			}

			sourceImage, _, err := image.Decode(file)
			_ = file.Close()
			if err != nil {
				fmt.Fprintln(os.Stderr, "Error:", err)
				continue
			}

			printImage(sourceImage, width, height)
		}
	}
}

func printSize() {
	rows, cols, err := pty.Getsize(os.Stdin)
	if err != nil {
		log.Fatalln("failed to get window size:", err)
	}

	fmt.Printf("rows: %d, cols: %d\n", rows, cols)
}

func Hijack(c *cli.Context) {
	target := returnTarget(c.GlobalString("target"))
	insecure := c.GlobalBool("insecure")

	stepType := c.String("step-type")
	stepName := c.String("step-name")
	check := c.String("check")
	pipelineName := c.String("pipeline")
	jobName := c.String("job")
	buildName := c.String("build")

	path, args := remoteCommand(c.Args())
	privileged := true

	fingerprint := containerFingerprint{
		pipelineName: pipelineName,
		jobName:      jobName,
		buildName:    buildName,
		stepName:     stepName,
		stepType:     stepType,
		checkName:    check,
	}

	reqGenerator := rata.NewRequestGenerator(target, atc.Routes)
	tlsConfig := &tls.Config{InsecureSkipVerify: insecure}
	transport := &http.Transport{
		TLSClientConfig: tlsConfig,
	}
	client := &http.Client{Transport: transport}

	reqValues := locateContainer(client, reqGenerator, fingerprint)

	var ttySpec *atc.HijackTTYSpec
	rows, cols, err := pty.Getsize(os.Stdin)
	if err == nil {
		ttySpec = &atc.HijackTTYSpec{
			WindowSize: atc.HijackWindowSize{
				Columns: cols,
				Rows:    rows,
			},
		}
	}

	spec := atc.HijackProcessSpec{
		Path: path,
		Args: args,
		Env:  []string{"TERM=" + os.Getenv("TERM")},
		User: "root",

		Privileged: privileged,
		TTY:        ttySpec,
	}

	hijackReq := constructRequest(reqGenerator, spec, reqValues)
	hijackResult := performHijack(hijackReq, tlsConfig)
	os.Exit(hijackResult)
}

func sendSize(enc *json.Encoder) {
	rows, cols, err := pty.Getsize(os.Stdin)
	if err == nil {
		enc.Encode(atc.HijackInput{
			TTYSpec: &atc.HijackTTYSpec{
				WindowSize: atc.HijackWindowSize{
					Columns: cols,
					Rows:    rows,
				},
			},
		})
	}
}

func Getsize(file *os.File) (int, int, error) {
	return pty.Getsize(file)
}

//.........这里部分代码省略.........
				failIf(err)

				process, err := container.Attach(pid, garden.ProcessIO{
					Stdin:  os.Stdin,
					Stdout: os.Stdout,
					Stderr: os.Stderr,
				})
				failIf(err)

				_, err = process.Wait()
				failIf(err)
			},
		},
		{
			Name:  "shell",
			Usage: "open a shell inside the running container",
			Flags: []cli.Flag{
				cli.StringFlag{
					Name:  "user, u",
					Usage: "user to open shell as",
				},
			},
			BashComplete: handleComplete,
			Action: func(c *cli.Context) {
				container, err := client(c).Lookup(handle(c))
				failIf(err)

				term, err := term.Open(os.Stdin.Name())
				failIf(err)

				err = term.SetRaw()
				failIf(err)

				rows, cols, err := pty.Getsize(os.Stdin)
				failIf(err)

				process, err := container.Run(garden.ProcessSpec{
					User: c.String("user"),
					Path: "/bin/sh",
					Args: []string{"-l"},
					Env:  []string{"TERM=" + os.Getenv("TERM")},
					TTY: &garden.TTYSpec{
						WindowSize: &garden.WindowSize{
							Rows:    rows,
							Columns: cols,
						},
					},
				}, garden.ProcessIO{
					Stdin:  term,
					Stdout: term,
					Stderr: term,
				})
				if err != nil {
					term.Restore()
					failIf(err)
				}

				resized := make(chan os.Signal, 10)
				signal.Notify(resized, syscall.SIGWINCH)

				go func() {
					for {
						<-resized

						rows, cols, err := pty.Getsize(os.Stdin)
						if err == nil {