commands.go

package client

import (
	"bufio"
	"bytes"
	"encoding/base64"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"io/ioutil"
	"net/http"
	"net/url"
	"os"
	"os/exec"
	"path"
	"path/filepath"
	"runtime"
	"sort"
	"strconv"
	"strings"
	"sync"
	"text/tabwriter"
	"text/template"
	"time"

	log "github.com/Sirupsen/logrus"
	"github.com/docker/docker/api"
	"github.com/docker/docker/api/stats"
	"github.com/docker/docker/dockerversion"
	"github.com/docker/docker/engine"
	"github.com/docker/docker/graph"
	"github.com/docker/docker/nat"
	"github.com/docker/docker/opts"
	"github.com/docker/docker/pkg/archive"
	"github.com/docker/docker/pkg/fileutils"
	flag "github.com/docker/docker/pkg/mflag"
	"github.com/docker/docker/pkg/parsers"
	"github.com/docker/docker/pkg/parsers/filters"
	"github.com/docker/docker/pkg/promise"
	"github.com/docker/docker/pkg/signal"
	"github.com/docker/docker/pkg/term"
	"github.com/docker/docker/pkg/timeutils"
	"github.com/docker/docker/pkg/units"
	"github.com/docker/docker/pkg/urlutil"
	"github.com/docker/docker/registry"
	"github.com/docker/docker/runconfig"
	"github.com/docker/docker/utils"
	"github.com/docker/libtrust"
)

const (
	tarHeaderSize = 512
)

func (cli *DockerCli) CmdHelp(args ...string) error {
	if len(args) > 1 {
		method, exists := cli.getMethod(args[:2]...)
		if exists {
			method("--help")
			return nil
		}
	}
	if len(args) > 0 {
		method, exists := cli.getMethod(args[0])
		if !exists {
			fmt.Fprintf(cli.err, "docker: '%s' is not a docker command. See 'docker --help'.\n", args[0])
			os.Exit(1)
		} else {
			method("--help")
			return nil
		}
	}

	flag.Usage()

	return nil
}

func (cli *DockerCli) CmdBuild(args ...string) error {
	cmd := cli.Subcmd("build", "PATH | URL | -", "Build a new image from the source code at PATH", true)
	tag := cmd.String([]string{"t", "-tag"}, "", "Repository name (and optionally a tag) to be applied to the resulting image in case of success")
	suppressOutput := cmd.Bool([]string{"q", "-quiet"}, false, "Suppress the verbose output generated by the containers")
	noCache := cmd.Bool([]string{"#no-cache", "-no-cache"}, false, "Do not use cache when building the image")
	rm := cmd.Bool([]string{"#rm", "-rm"}, true, "Remove intermediate containers after a successful build")
	forceRm := cmd.Bool([]string{"-force-rm"}, false, "Always remove intermediate containers, even after unsuccessful builds")
	pull := cmd.Bool([]string{"-pull"}, false, "Always attempt to pull a newer version of the image")
	dockerfileName := cmd.String([]string{"f", "-file"}, "", "Name of the Dockerfile(Default is 'Dockerfile' at context root)")

	cmd.Require(flag.Exact, 1)

	utils.ParseFlags(cmd, args, true)

	var (
		context  archive.Archive
		isRemote bool
		err      error
	)

	_, err = exec.LookPath("git")
	hasGit := err == nil
	if cmd.Arg(0) == "-" {
		// As a special case, 'docker build -' will build from either an empty context with the
		// contents of stdin as a Dockerfile, or a tar-ed context from stdin.
		buf := bufio.NewReader(cli.in)
		magic, err := buf.Peek(tarHeaderSize)
		if err != nil && err != io.EOF {
			return fmt.Errorf("failed to peek context header from STDIN: %v", err)
		}
		if !archive.IsArchive(magic) {
			dockerfile, err := ioutil.ReadAll(buf)
			if err != nil {
				return fmt.Errorf("failed to read Dockerfile from STDIN: %v", err)
			}
			if *dockerfileName == "" {
				*dockerfileName = api.DefaultDockerfileName
			}
			context, err = archive.Generate(*dockerfileName, string(dockerfile))
		} else {
			context = ioutil.NopCloser(buf)
		}
	} else if urlutil.IsURL(cmd.Arg(0)) && (!urlutil.IsGitURL(cmd.Arg(0)) || !hasGit) {
		isRemote = true
	} else {
		root := cmd.Arg(0)
		if urlutil.IsGitURL(root) {
			remoteURL := cmd.Arg(0)
			if !urlutil.IsGitTransport(remoteURL) {
				remoteURL = "https://" + remoteURL
			}

			root, err = ioutil.TempDir("", "docker-build-git")
			if err != nil {
				return err
			}
			defer os.RemoveAll(root)

			if output, err := exec.Command("git", "clone", "--recursive", remoteURL, root).CombinedOutput(); err != nil {
				return fmt.Errorf("Error trying to use git: %s (%s)", err, output)
			}
		}
		if _, err := os.Stat(root); err != nil {
			return err
		}

		absRoot, err := filepath.Abs(root)
		if err != nil {
			return err
		}

		var filename string       // path to Dockerfile
		var origDockerfile string // used for error msg

		if *dockerfileName == "" {
			// No -f/--file was specified so use the default
			origDockerfile = api.DefaultDockerfileName
			*dockerfileName = origDockerfile
			filename = path.Join(absRoot, *dockerfileName)
		} else {
			origDockerfile = *dockerfileName
			if filename, err = filepath.Abs(*dockerfileName); err != nil {
				return err
			}

			// Verify that 'filename' is within the build context
			if !strings.HasSuffix(absRoot, string(os.PathSeparator)) {
				absRoot += string(os.PathSeparator)
			}
			if !strings.HasPrefix(filename, absRoot) {
				return fmt.Errorf("The Dockerfile (%s) must be within the build context (%s)", *dockerfileName, root)
			}

			// Now reset the dockerfileName to be relative to the build context
			*dockerfileName = filename[len(absRoot):]
		}

		if _, err = os.Stat(filename); os.IsNotExist(err) {
			return fmt.Errorf("Can not locate Dockerfile: %s", origDockerfile)
		}
		var includes []string = []string{"."}

		excludes, err := utils.ReadDockerIgnore(path.Join(root, ".dockerignore"))
		if err != nil {
			return err
		}

		// If .dockerignore mentions .dockerignore or the Dockerfile
		// then make sure we send both files over to the daemon
		// because Dockerfile is, obviously, needed no matter what, and
		// .dockerignore is needed to know if either one needs to be
		// removed.  The deamon will remove them for us, if needed, after it
		// parses the Dockerfile.
		keepThem1, _ := fileutils.Matches(".dockerignore", excludes)
		keepThem2, _ := fileutils.Matches(*dockerfileName, excludes)
		if keepThem1 || keepThem2 {
			includes = append(includes, ".dockerignore", *dockerfileName)
		}

		if err = utils.ValidateContextDirectory(root, excludes); err != nil {
			return fmt.Errorf("Error checking context is accessible: '%s'. Please check permissions and try again.", err)
		}
		options := &archive.TarOptions{
			Compression:     archive.Uncompressed,
			ExcludePatterns: excludes,
			IncludeFiles:    includes,
		}
		context, err = archive.TarWithOptions(root, options)
		if err != nil {
			return err
		}
	}
	var body io.Reader
	// Setup an upload progress bar
	// FIXME: ProgressReader shouldn't be this annoying to use
	if context != nil {
		sf := utils.NewStreamFormatter(false)
		body = utils.ProgressReader(context, 0, cli.out, sf, true, "", "Sending build context to Docker daemon")
	}
	// Send the build context
	v := &url.Values{}

	//Check if the given image name can be resolved
	if *tag != "" {
		repository, tag := parsers.ParseRepositoryTag(*tag)
		if err := registry.ValidateRepositoryName(repository); err != nil {
			return err
		}
		if len(tag) > 0 {
			if err := graph.ValidateTagName(tag); err != nil {
				return err
			}
		}
	}

	v.Set("t", *tag)

	if *suppressOutput {
		v.Set("q", "1")
	}
	if isRemote {
		v.Set("remote", cmd.Arg(0))
	}
	if *noCache {
		v.Set("nocache", "1")
	}
	if *rm {
		v.Set("rm", "1")
	} else {
		v.Set("rm", "0")
	}

	if *forceRm {
		v.Set("forcerm", "1")
	}

	if *pull {
		v.Set("pull", "1")
	}

	v.Set("dockerfile", *dockerfileName)

	cli.LoadConfigFile()

	headers := http.Header(make(map[string][]string))
	buf, err := json.Marshal(cli.configFile)
	if err != nil {
		return err
	}
	headers.Add("X-Registry-Config", base64.URLEncoding.EncodeToString(buf))

	if context != nil {
		headers.Set("Content-Type", "application/tar")
	}
	err = cli.stream("POST", fmt.Sprintf("/build?%s", v.Encode()), body, cli.out, headers)
	if jerr, ok := err.(*utils.JSONError); ok {
		// If no error code is set, default to 1
		if jerr.Code == 0 {
			jerr.Code = 1
		}
		return &utils.StatusError{Status: jerr.Message, StatusCode: jerr.Code}
	}
	return err
}

// 'docker login': login / register a user to registry service.
func (cli *DockerCli) CmdLogin(args ...string) error {
	cmd := cli.Subcmd("login", "[SERVER]", "Register or log in to a Docker registry server, if no server is specified \""+registry.IndexServerAddress()+"\" is the default.", true)
	cmd.Require(flag.Max, 1)

	var username, password, email string

	cmd.StringVar(&username, []string{"u", "-username"}, "", "Username")
	cmd.StringVar(&password, []string{"p", "-password"}, "", "Password")
	cmd.StringVar(&email, []string{"e", "-email"}, "", "Email")

	utils.ParseFlags(cmd, args, true)

	serverAddress := registry.IndexServerAddress()
	if len(cmd.Args()) > 0 {
		serverAddress = cmd.Arg(0)
	}

	promptDefault := func(prompt string, configDefault string) {
		if configDefault == "" {
			fmt.Fprintf(cli.out, "%s: ", prompt)
		} else {
			fmt.Fprintf(cli.out, "%s (%s): ", prompt, configDefault)
		}
	}

	readInput := func(in io.Reader, out io.Writer) string {
		reader := bufio.NewReader(in)
		line, _, err := reader.ReadLine()
		if err != nil {
			fmt.Fprintln(out, err.Error())
			os.Exit(1)
		}
		return string(line)
	}

	cli.LoadConfigFile()
	authconfig, ok := cli.configFile.Configs[serverAddress]
	if !ok {
		authconfig = registry.AuthConfig{}
	}

	if username == "" {
		promptDefault("Username", authconfig.Username)
		username = readInput(cli.in, cli.out)
		if username == "" {
			username = authconfig.Username
		}
	}
	// Assume that a different username means they may not want to use
	// the password or email from the config file, so prompt them
	if username != authconfig.Username {
		if password == "" {
			oldState, err := term.SaveState(cli.inFd)
			if err != nil {
				return err
			}
			fmt.Fprintf(cli.out, "Password: ")
			term.DisableEcho(cli.inFd, oldState)

			password = readInput(cli.in, cli.out)
			fmt.Fprint(cli.out, "\n")

			term.RestoreTerminal(cli.inFd, oldState)
			if password == "" {
				return fmt.Errorf("Error : Password Required")
			}
		}

		if email == "" {
			promptDefault("Email", authconfig.Email)
			email = readInput(cli.in, cli.out)
			if email == "" {
				email = authconfig.Email
			}
		}
	} else {
		// However, if they don't override the username use the
		// password or email from the cmd line if specified. IOW, allow
		// then to change/overide them.  And if not specified, just
		// use what's in the config file
		if password == "" {
			password = authconfig.Password
		}
		if email == "" {
			email = authconfig.Email
		}
	}
	authconfig.Username = username
	authconfig.Password = password
	authconfig.Email = email
	authconfig.ServerAddress = serverAddress
	cli.configFile.Configs[serverAddress] = authconfig

	stream, statusCode, err := cli.call("POST", "/auth", cli.configFile.Configs[serverAddress], false)
	if statusCode == 401 {
		delete(cli.configFile.Configs, serverAddress)
		registry.SaveConfig(cli.configFile)
		return err
	}
	if err != nil {
		return err
	}
	var out2 engine.Env
	err = out2.Decode(stream)
	if err != nil {
		cli.configFile, _ = registry.LoadConfig(os.Getenv("HOME"))
		return err
	}
	registry.SaveConfig(cli.configFile)
	if out2.Get("Status") != "" {
		fmt.Fprintf(cli.out, "%s\n", out2.Get("Status"))
	}
	return nil
}

// log out from a Docker registry
func (cli *DockerCli) CmdLogout(args ...string) error {
	cmd := cli.Subcmd("logout", "[SERVER]", "Log out from a Docker registry, if no server is specified \""+registry.IndexServerAddress()+"\" is the default.", true)
	cmd.Require(flag.Max, 1)

	utils.ParseFlags(cmd, args, false)
	serverAddress := registry.IndexServerAddress()
	if len(cmd.Args()) > 0 {
		serverAddress = cmd.Arg(0)
	}

	cli.LoadConfigFile()
	if _, ok := cli.configFile.Configs[serverAddress]; !ok {
		fmt.Fprintf(cli.out, "Not logged in to %s\n", serverAddress)
	} else {
		fmt.Fprintf(cli.out, "Remove login credentials for %s\n", serverAddress)
		delete(cli.configFile.Configs, serverAddress)

		if err := registry.SaveConfig(cli.configFile); err != nil {
			return fmt.Errorf("Failed to save docker config: %v", err)
		}
	}
	return nil
}

// 'docker wait': block until a container stops
func (cli *DockerCli) CmdWait(args ...string) error {
	cmd := cli.Subcmd("wait", "CONTAINER [CONTAINER...]", "Block until a container stops, then print its exit code.", true)
	cmd.Require(flag.Min, 1)

	utils.ParseFlags(cmd, args, true)

	var encounteredError error
	for _, name := range cmd.Args() {
		status, err := waitForExit(cli, name)
		if err != nil {
			fmt.Fprintf(cli.err, "%s\n", err)
			encounteredError = fmt.Errorf("Error: failed to wait one or more containers")
		} else {
			fmt.Fprintf(cli.out, "%d\n", status)
		}
	}
	return encounteredError
}

// 'docker version': show version information
func (cli *DockerCli) CmdVersion(args ...string) error {
	cmd := cli.Subcmd("version", "", "Show the Docker version information.", true)
	cmd.Require(flag.Exact, 0)

	utils.ParseFlags(cmd, args, false)

	if dockerversion.VERSION != "" {
		fmt.Fprintf(cli.out, "Client version: %s\n", dockerversion.VERSION)
	}
	fmt.Fprintf(cli.out, "Client API version: %s\n", api.APIVERSION)
	fmt.Fprintf(cli.out, "Go version (client): %s\n", runtime.Version())
	if dockerversion.GITCOMMIT != "" {
		fmt.Fprintf(cli.out, "Git commit (client): %s\n", dockerversion.GITCOMMIT)
	}
	fmt.Fprintf(cli.out, "OS/Arch (client): %s/%s\n", runtime.GOOS, runtime.GOARCH)

	body, _, err := readBody(cli.call("GET", "/version", nil, false))
	if err != nil {
		return err
	}

	out := engine.NewOutput()
	remoteVersion, err := out.AddEnv()
	if err != nil {
		log.Errorf("Error reading remote version: %s", err)
		return err
	}
	if _, err := out.Write(body); err != nil {
		log.Errorf("Error reading remote version: %s", err)
		return err
	}
	out.Close()
	fmt.Fprintf(cli.out, "Server version: %s\n", remoteVersion.Get("Version"))
	if apiVersion := remoteVersion.Get("ApiVersion"); apiVersion != "" {
		fmt.Fprintf(cli.out, "Server API version: %s\n", apiVersion)
	}
	fmt.Fprintf(cli.out, "Go version (server): %s\n", remoteVersion.Get("GoVersion"))
	fmt.Fprintf(cli.out, "Git commit (server): %s\n", remoteVersion.Get("GitCommit"))
	return nil
}

// 'docker info': display system-wide information.
func (cli *DockerCli) CmdInfo(args ...string) error {
	cmd := cli.Subcmd("info", "", "Display system-wide information", true)
	cmd.Require(flag.Exact, 0)
	utils.ParseFlags(cmd, args, false)

	body, _, err := readBody(cli.call("GET", "/info", nil, false))
	if err != nil {
		return err
	}

	out := engine.NewOutput()
	remoteInfo, err := out.AddEnv()
	if err != nil {
		return err
	}

	if _, err := out.Write(body); err != nil {
		log.Errorf("Error reading remote info: %s", err)
		return err
	}
	out.Close()

	if remoteInfo.Exists("Containers") {
		fmt.Fprintf(cli.out, "Containers: %d\n", remoteInfo.GetInt("Containers"))
	}
	if remoteInfo.Exists("Images") {
		fmt.Fprintf(cli.out, "Images: %d\n", remoteInfo.GetInt("Images"))
	}
	if remoteInfo.Exists("Driver") {
		fmt.Fprintf(cli.out, "Storage Driver: %s\n", remoteInfo.Get("Driver"))
	}
	if remoteInfo.Exists("DriverStatus") {
		var driverStatus [][2]string
		if err := remoteInfo.GetJson("DriverStatus", &driverStatus); err != nil {
			return err
		}
		for _, pair := range driverStatus {
			fmt.Fprintf(cli.out, " %s: %s\n", pair[0], pair[1])
		}
	}
	if remoteInfo.Exists("ExecutionDriver") {
		fmt.Fprintf(cli.out, "Execution Driver: %s\n", remoteInfo.Get("ExecutionDriver"))
	}
	if remoteInfo.Exists("KernelVersion") {
		fmt.Fprintf(cli.out, "Kernel Version: %s\n", remoteInfo.Get("KernelVersion"))
	}
	if remoteInfo.Exists("OperatingSystem") {
		fmt.Fprintf(cli.out, "Operating System: %s\n", remoteInfo.Get("OperatingSystem"))
	}
	if remoteInfo.Exists("NCPU") {
		fmt.Fprintf(cli.out, "CPUs: %d\n", remoteInfo.GetInt("NCPU"))
	}
	if remoteInfo.Exists("MemTotal") {
		fmt.Fprintf(cli.out, "Total Memory: %s\n", units.BytesSize(float64(remoteInfo.GetInt64("MemTotal"))))
	}
	if remoteInfo.Exists("Name") {
		fmt.Fprintf(cli.out, "Name: %s\n", remoteInfo.Get("Name"))
	}
	if remoteInfo.Exists("ID") {
		fmt.Fprintf(cli.out, "ID: %s\n", remoteInfo.Get("ID"))
	}

	if remoteInfo.GetBool("Debug") || os.Getenv("DEBUG") != "" {
		if remoteInfo.Exists("Debug") {
			fmt.Fprintf(cli.out, "Debug mode (server): %v\n", remoteInfo.GetBool("Debug"))
		}
		fmt.Fprintf(cli.out, "Debug mode (client): %v\n", os.Getenv("DEBUG") != "")
		if remoteInfo.Exists("NFd") {
			fmt.Fprintf(cli.out, "Fds: %d\n", remoteInfo.GetInt("NFd"))
		}
		if remoteInfo.Exists("NGoroutines") {
			fmt.Fprintf(cli.out, "Goroutines: %d\n", remoteInfo.GetInt("NGoroutines"))
		}
		if remoteInfo.Exists("NEventsListener") {
			fmt.Fprintf(cli.out, "EventsListeners: %d\n", remoteInfo.GetInt("NEventsListener"))
		}
		if initSha1 := remoteInfo.Get("InitSha1"); initSha1 != "" {
			fmt.Fprintf(cli.out, "Init SHA1: %s\n", initSha1)
		}
		if initPath := remoteInfo.Get("InitPath"); initPath != "" {
			fmt.Fprintf(cli.out, "Init Path: %s\n", initPath)
		}
		if root := remoteInfo.Get("DockerRootDir"); root != "" {
			fmt.Fprintf(cli.out, "Docker Root Dir: %s\n", root)
		}
	}

	if len(remoteInfo.GetList("IndexServerAddress")) != 0 {
		cli.LoadConfigFile()
		u := cli.configFile.Configs[remoteInfo.Get("IndexServerAddress")].Username
		if len(u) > 0 {
			fmt.Fprintf(cli.out, "Username: %v\n", u)
			fmt.Fprintf(cli.out, "Registry: %v\n", remoteInfo.GetList("IndexServerAddress"))
		}
	}
	if remoteInfo.Exists("MemoryLimit") && !remoteInfo.GetBool("MemoryLimit") {
		fmt.Fprintf(cli.err, "WARNING: No memory limit support\n")
	}
	if remoteInfo.Exists("SwapLimit") && !remoteInfo.GetBool("SwapLimit") {
		fmt.Fprintf(cli.err, "WARNING: No swap limit support\n")
	}
	if remoteInfo.Exists("IPv4Forwarding") && !remoteInfo.GetBool("IPv4Forwarding") {
		fmt.Fprintf(cli.err, "WARNING: IPv4 forwarding is disabled.\n")
	}
	if remoteInfo.Exists("Labels") {
		fmt.Fprintln(cli.out, "Labels:")
		for _, attribute := range remoteInfo.GetList("Labels") {
			fmt.Fprintf(cli.out, " %s\n", attribute)
		}
	}

	return nil
}

func (cli *DockerCli) CmdStop(args ...string) error {
	cmd := cli.Subcmd("stop", "CONTAINER [CONTAINER...]", "Stop a running container by sending SIGTERM and then SIGKILL after a grace period", true)
	nSeconds := cmd.Int([]string{"t", "-time"}, 10, "Number of seconds to wait for the container to stop before killing it. Default is 10 seconds.")
	cmd.Require(flag.Min, 1)

	utils.ParseFlags(cmd, args, true)

	v := url.Values{}
	v.Set("t", strconv.Itoa(*nSeconds))

	var encounteredError error
	for _, name := range cmd.Args() {
		_, _, err := readBody(cli.call("POST", "/containers/"+name+"/stop?"+v.Encode(), nil, false))
		if err != nil {
			fmt.Fprintf(cli.err, "%s\n", err)
			encounteredError = fmt.Errorf("Error: failed to stop one or more containers")
		} else {
			fmt.Fprintf(cli.out, "%s\n", name)
		}
	}
	return encounteredError
}

func (cli *DockerCli) CmdRestart(args ...string) error {
	cmd := cli.Subcmd("restart", "CONTAINER [CONTAINER...]", "Restart a running container", true)
	nSeconds := cmd.Int([]string{"t", "-time"}, 10, "Number of seconds to try to stop for before killing the container. Once killed it will then be restarted. Default is 10 seconds.")
	cmd.Require(flag.Min, 1)

	utils.ParseFlags(cmd, args, true)

	v := url.Values{}
	v.Set("t", strconv.Itoa(*nSeconds))

	var encounteredError error
	for _, name := range cmd.Args() {
		_, _, err := readBody(cli.call("POST", "/containers/"+name+"/restart?"+v.Encode(), nil, false))
		if err != nil {
			fmt.Fprintf(cli.err, "%s\n", err)
			encounteredError = fmt.Errorf("Error: failed to restart one or more containers")
		} else {
			fmt.Fprintf(cli.out, "%s\n", name)
		}
	}
	return encounteredError
}

func (cli *DockerCli) forwardAllSignals(cid string) chan os.Signal {
	sigc := make(chan os.Signal, 128)
	signal.CatchAll(sigc)
	go func() {
		for s := range sigc {
			if s == signal.SIGCHLD {
				continue
			}
			var sig string
			for sigStr, sigN := range signal.SignalMap {
				if sigN == s {
					sig = sigStr
					break
				}
			}
			if sig == "" {
				log.Errorf("Unsupported signal: %v. Discarding.", s)
			}
			if _, _, err := readBody(cli.call("POST", fmt.Sprintf("/containers/%s/kill?signal=%s", cid, sig), nil, false)); err != nil {
				log.Debugf("Error sending signal: %s", err)
			}
		}
	}()
	return sigc
}

func (cli *DockerCli) CmdStart(args ...string) error {
	var (
		cErr chan error
		tty  bool

		cmd       = cli.Subcmd("start", "CONTAINER [CONTAINER...]", "Restart a stopped container", true)
		attach    = cmd.Bool([]string{"a", "-attach"}, false, "Attach container's STDOUT and STDERR and forward all signals to the process")
		openStdin = cmd.Bool([]string{"i", "-interactive"}, false, "Attach container's STDIN")
	)

	cmd.Require(flag.Min, 1)
	utils.ParseFlags(cmd, args, true)

	hijacked := make(chan io.Closer)

	if *attach || *openStdin {
		if cmd.NArg() > 1 {
			return fmt.Errorf("You cannot start and attach multiple containers at once.")
		}

		stream, _, err := cli.call("GET", "/containers/"+cmd.Arg(0)+"/json", nil, false)
		if err != nil {
			return err
		}

		env := engine.Env{}
		if err := env.Decode(stream); err != nil {
			return err
		}
		config := env.GetSubEnv("Config")
		tty = config.GetBool("Tty")

		if !tty {
			sigc := cli.forwardAllSignals(cmd.Arg(0))
			defer signal.StopCatch(sigc)
		}

		var in io.ReadCloser

		v := url.Values{}
		v.Set("stream", "1")

		if *openStdin && config.GetBool("OpenStdin") {
			v.Set("stdin", "1")
			in = cli.in
		}

		v.Set("stdout", "1")
		v.Set("stderr", "1")

		cErr = promise.Go(func() error {
			return cli.hijack("POST", "/containers/"+cmd.Arg(0)+"/attach?"+v.Encode(), tty, in, cli.out, cli.err, hijacked, nil)
		})
	} else {
		close(hijacked)
	}

	// Acknowledge the hijack before starting
	select {
	case closer := <-hijacked:
		// Make sure that the hijack gets closed when returning (results
		// in closing the hijack chan and freeing server's goroutines)
		if closer != nil {
			defer closer.Close()
		}
	case err := <-cErr:
		if err != nil {
			return err
		}
	}

	var encounteredError error
	for _, name := range cmd.Args() {
		_, _, err := readBody(cli.call("POST", "/containers/"+name+"/start", nil, false))
		if err != nil {
			if !*attach && !*openStdin {
				fmt.Fprintf(cli.err, "%s\n", err)
			}
			encounteredError = fmt.Errorf("Error: failed to start one or more containers")
		} else {
			if !*attach && !*openStdin {
				fmt.Fprintf(cli.out, "%s\n", name)
			}
		}
	}
	if encounteredError != nil {
		if *openStdin || *attach {
			cli.in.Close()
		}
		return encounteredError
	}

	if *openStdin || *attach {
		if tty && cli.isTerminalOut {
			if err := cli.monitorTtySize(cmd.Arg(0), false); err != nil {
				log.Errorf("Error monitoring TTY size: %s", err)
			}
		}
		if attchErr := <-cErr; attchErr != nil {
			return attchErr
		}
		_, status, err := getExitCode(cli, cmd.Arg(0))
		if err != nil {
			return err
		}
		if status != 0 {
			return &utils.StatusError{StatusCode: status}
		}
	}
	return nil
}

func (cli *DockerCli) CmdUnpause(args ...string) error {
	cmd := cli.Subcmd("unpause", "CONTAINER", "Unpause all processes within a container", true)
	cmd.Require(flag.Exact, 1)
	utils.ParseFlags(cmd, args, false)

	var encounteredError error
	for _, name := range cmd.Args() {
		if _, _, err := readBody(cli.call("POST", fmt.Sprintf("/containers/%s/unpause", name), nil, false)); err != nil {
			fmt.Fprintf(cli.err, "%s\n", err)
			encounteredError = fmt.Errorf("Error: failed to unpause container named %s", name)
		} else {
			fmt.Fprintf(cli.out, "%s\n", name)
		}
	}
	return encounteredError
}

func (cli *DockerCli) CmdPause(args ...string) error {
	cmd := cli.Subcmd("pause", "CONTAINER", "Pause all processes within a container", true)
	cmd.Require(flag.Exact, 1)
	utils.ParseFlags(cmd, args, false)

	var encounteredError error
	for _, name := range cmd.Args() {
		if _, _, err := readBody(cli.call("POST", fmt.Sprintf("/containers/%s/pause", name), nil, false)); err != nil {
			fmt.Fprintf(cli.err, "%s\n", err)
			encounteredError = fmt.Errorf("Error: failed to pause container named %s", name)
		} else {
			fmt.Fprintf(cli.out, "%s\n", name)
		}
	}
	return encounteredError
}

func (cli *DockerCli) CmdRename(args ...string) error {
	cmd := cli.Subcmd("rename", "OLD_NAME NEW_NAME", "Rename a container", true)
	if err := cmd.Parse(args); err != nil {
		return nil
	}

	if cmd.NArg() != 2 {
		cmd.Usage()
		return nil
	}
	old_name := cmd.Arg(0)
	new_name := cmd.Arg(1)

	if _, _, err := readBody(cli.call("POST", fmt.Sprintf("/containers/%s/rename?name=%s", old_name, new_name), nil, false)); err != nil {
		fmt.Fprintf(cli.err, "%s\n", err)
		return fmt.Errorf("Error: failed to rename container named %s", old_name)
	}
	return nil
}

func (cli *DockerCli) CmdInspect(args ...string) error {
	cmd := cli.Subcmd("inspect", "CONTAINER|IMAGE [CONTAINER|IMAGE...]", "Return low-level information on a container or image", true)
	tmplStr := cmd.String([]string{"f", "#format", "-format"}, "", "Format the output using the given go template.")
	cmd.Require(flag.Min, 1)

	utils.ParseFlags(cmd, args, true)

	var tmpl *template.Template
	if *tmplStr != "" {
		var err error
		if tmpl, err = template.New("").Funcs(funcMap).Parse(*tmplStr); err != nil {
			fmt.Fprintf(cli.err, "Template parsing error: %v\n", err)
			return &utils.StatusError{StatusCode: 64,
				Status: "Template parsing error: " + err.Error()}
		}
	}

	indented := new(bytes.Buffer)
	indented.WriteByte('[')
	status := 0

	for _, name := range cmd.Args() {
		obj, _, err := readBody(cli.call("GET", "/containers/"+name+"/json", nil, false))
		if err != nil {
			obj, _, err = readBody(cli.call("GET", "/images/"+name+"/json", nil, false))
			if err != nil {
				if strings.Contains(err.Error(), "No such") {
					fmt.Fprintf(cli.err, "Error: No such image or container: %s\n", name)
				} else {
					fmt.Fprintf(cli.err, "%s", err)
				}
				status = 1
				continue
			}
		}

		if tmpl == nil {
			if err = json.Indent(indented, obj, "", "    "); err != nil {
				fmt.Fprintf(cli.err, "%s\n", err)
				status = 1
				continue
			}
		} else {
			// Has template, will render
			var value interface{}
			if err := json.Unmarshal(obj, &value); err != nil {
				fmt.Fprintf(cli.err, "%s\n", err)
				status = 1
				continue
			}
			if err := tmpl.Execute(cli.out, value); err != nil {
				return err
			}
			cli.out.Write([]byte{'\n'})
		}
		indented.WriteString(",")
	}

	if indented.Len() > 1 {
		// Remove trailing ','
		indented.Truncate(indented.Len() - 1)
	}
	indented.WriteString("]\n")

	if tmpl == nil {
		if _, err := io.Copy(cli.out, indented); err != nil {
			return err
		}
	}

	if status != 0 {
		return &utils.StatusError{StatusCode: status}
	}
	return nil
}

func (cli *DockerCli) CmdTop(args ...string) error {
	cmd := cli.Subcmd("top", "CONTAINER [ps OPTIONS]", "Display the running processes of a container", true)
	cmd.Require(flag.Min, 1)

	utils.ParseFlags(cmd, args, true)

	val := url.Values{}
	if cmd.NArg() > 1 {
		val.Set("ps_args", strings.Join(cmd.Args()[1:], " "))
	}

	stream, _, err := cli.call("GET", "/containers/"+cmd.Arg(0)+"/top?"+val.Encode(), nil, false)
	if err != nil {
		return err
	}
	var procs engine.Env
	if err := procs.Decode(stream); err != nil {
		return err
	}
	w := tabwriter.NewWriter(cli.out, 20, 1, 3, ' ', 0)
	fmt.Fprintln(w, strings.Join(procs.GetList("Titles"), "\t"))
	processes := [][]string{}
	if err := procs.GetJson("Processes", &processes); err != nil {
		return err
	}
	for _, proc := range processes {
		fmt.Fprintln(w, strings.Join(proc, "\t"))
	}
	w.Flush()
	return nil
}

func (cli *DockerCli) CmdPort(args ...string) error {
	cmd := cli.Subcmd("port", "CONTAINER [PRIVATE_PORT[/PROTO]]", "List port mappings for the CONTAINER, or lookup the public-facing port that is NAT-ed to the PRIVATE_PORT", true)
	cmd.Require(flag.Min, 1)
	utils.ParseFlags(cmd, args, true)

	stream, _, err := cli.call("GET", "/containers/"+cmd.Arg(0)+"/json", nil, false)
	if err != nil {
		return err
	}

	env := engine.Env{}
	if err := env.Decode(stream); err != nil {
		return err
	}
	ports := nat.PortMap{}
	if err := env.GetSubEnv("NetworkSettings").GetJson("Ports", &ports); err != nil {
		return err
	}

	if cmd.NArg() == 2 {
		var (
			port  = cmd.Arg(1)
			proto = "tcp"
			parts = strings.SplitN(port, "/", 2)
		)

		if len(parts) == 2 && len(parts[1]) != 0 {
			port = parts[0]
			proto = parts[1]
		}
		natPort := port + "/" + proto
		if frontends, exists := ports[nat.Port(port+"/"+proto)]; exists && frontends != nil {
			for _, frontend := range frontends {
				fmt.Fprintf(cli.out, "%s:%s\n", frontend.HostIp, frontend.HostPort)
			}
			return nil
		}
		return fmt.Errorf("Error: No public port '%s' published for %s", natPort, cmd.Arg(0))
	}

	for from, frontends := range ports {
		for _, frontend := range frontends {
			fmt.Fprintf(cli.out, "%s -> %s:%s\n", from, frontend.HostIp, frontend.HostPort)
		}
	}

	return nil
}

// 'docker rmi IMAGE' removes all images with the name IMAGE
func (cli *DockerCli) CmdRmi(args ...string) error {
	var (
		cmd     = cli.Subcmd("rmi", "IMAGE [IMAGE...]", "Remove one or more images", true)
		force   = cmd.Bool([]string{"f", "-force"}, false, "Force removal of the image")
		noprune = cmd.Bool([]string{"-no-prune"}, false, "Do not delete untagged parents")
	)
	cmd.Require(flag.Min, 1)

	utils.ParseFlags(cmd, args, true)

	v := url.Values{}
	if *force {
		v.Set("force", "1")
	}
	if *noprune {
		v.Set("noprune", "1")
	}

	var encounteredError error
	for _, name := range cmd.Args() {
		body, _, err := readBody(cli.call("DELETE", "/images/"+name+"?"+v.Encode(), nil, false))
		if err != nil {
			fmt.Fprintf(cli.err, "%s\n", err)
			encounteredError = fmt.Errorf("Error: failed to remove one or more images")
		} else {
			outs := engine.NewTable("Created", 0)
			if _, err := outs.ReadListFrom(body); err != nil {
				fmt.Fprintf(cli.err, "%s\n", err)
				encounteredError = fmt.Errorf("Error: failed to remove one or more images")
				continue
			}
			for _, out := range outs.Data {
				if out.Get("Deleted") != "" {
					fmt.Fprintf(cli.out, "Deleted: %s\n", out.Get("Deleted"))
				} else {
					fmt.Fprintf(cli.out, "Untagged: %s\n", out.Get("Untagged"))
				}
			}
		}
	}
	return encounteredError
}

func (cli *DockerCli) CmdHistory(args ...string) error {
	cmd := cli.Subcmd("history", "IMAGE", "Show the history of an image", true)
	quiet := cmd.Bool([]string{"q", "-quiet"}, false, "Only show numeric IDs")
	noTrunc := cmd.Bool([]string{"#notrunc", "-no-trunc"}, false, "Don't truncate output")
	cmd.Require(flag.Exact, 1)

	utils.ParseFlags(cmd, args, true)

	body, _, err := readBody(cli.call("GET", "/images/"+cmd.Arg(0)+"/history", nil, false))
	if err != nil {
		return err
	}

	outs := engine.NewTable("Created", 0)
	if _, err := outs.ReadListFrom(body); err != nil {
		return err
	}

	w := tabwriter.NewWriter(cli.out, 20, 1, 3, ' ', 0)
	if !*quiet {
		fmt.Fprintln(w, "IMAGE\tCREATED\tCREATED BY\tSIZE")
	}

	for _, out := range outs.Data {
		outID := out.Get("Id")
		if !*quiet {
			if *noTrunc {
				fmt.Fprintf(w, "%s\t", outID)
			} else {
				fmt.Fprintf(w, "%s\t", utils.TruncateID(outID))
			}

			fmt.Fprintf(w, "%s ago\t", units.HumanDuration(time.Now().UTC().Sub(time.Unix(out.GetInt64("Created"), 0))))

			if *noTrunc {
				fmt.Fprintf(w, "%s\t", out.Get("CreatedBy"))
			} else {
				fmt.Fprintf(w, "%s\t", utils.Trunc(out.Get("CreatedBy"), 45))
			}
			fmt.Fprintf(w, "%s\n", units.HumanSize(float64(out.GetInt64("Size"))))
		} else {
			if *noTrunc {
				fmt.Fprintln(w, outID)
			} else {
				fmt.Fprintln(w, utils.TruncateID(outID))
			}
		}
	}
	w.Flush()
	return nil
}

func (cli *DockerCli) CmdRm(args ...string) error {
	cmd := cli.Subcmd("rm", "CONTAINER [CONTAINER...]", "Remove one or more containers", true)
	v := cmd.Bool([]string{"v", "-volumes"}, false, "Remove the volumes associated with the container")
	link := cmd.Bool([]string{"l", "#link", "-link"}, false, "Remove the specified link and not the underlying container")
	force := cmd.Bool([]string{"f", "-force"}, false, "Force the removal of a running container (uses SIGKILL)")
	cmd.Require(flag.Min, 1)

	utils.ParseFlags(cmd, args, true)

	val := url.Values{}
	if *v {
		val.Set("v", "1")
	}
	if *link {
		val.Set("link", "1")
	}

	if *force {
		val.Set("force", "1")
	}

	var encounteredError error
	for _, name := range cmd.Args() {
		_, _, err := readBody(cli.call("DELETE", "/containers/"+name+"?"+val.Encode(), nil, false))
		if err != nil {
			fmt.Fprintf(cli.err, "%s\n", err)
			encounteredError = fmt.Errorf("Error: failed to remove one or more containers")
		} else {
			fmt.Fprintf(cli.out, "%s\n", name)
		}
	}
	return encounteredError
}

// 'docker kill NAME' kills a running container
func (cli *DockerCli) CmdKill(args ...string) error {
	cmd := cli.Subcmd("kill", "CONTAINER [CONTAINER...]", "Kill a running container using SIGKILL or a specified signal", true)
	signal := cmd.String([]string{"s", "-signal"}, "KILL", "Signal to send to the container")
	cmd.Require(flag.Min, 1)

	utils.ParseFlags(cmd, args, true)

	var encounteredError error
	for _, name := range cmd.Args() {
		if _, _, err := readBody(cli.call("POST", fmt.Sprintf("/containers/%s/kill?signal=%s", name, *signal), nil, false)); err != nil {
			fmt.Fprintf(cli.err, "%s\n", err)
			encounteredError = fmt.Errorf("Error: failed to kill one or more containers")
		} else {
			fmt.Fprintf(cli.out, "%s\n", name)
		}
	}
	return encounteredError
}

func (cli *DockerCli) CmdImport(args ...string) error {
	cmd := cli.Subcmd("import", "URL|- [REPOSITORY[:TAG]]", "Create an empty filesystem image and import the contents of the tarball (.tar, .tar.gz, .tgz, .bzip, .tar.xz, .txz) into it, then optionally tag it.", true)
	cmd.Require(flag.Min, 1)

	utils.ParseFlags(cmd, args, true)

	var (
		v          = url.Values{}
		src        = cmd.Arg(0)
		repository = cmd.Arg(1)
	)

	v.Set("fromSrc", src)
	v.Set("repo", repository)

	if cmd.NArg() == 3 {
		fmt.Fprintf(cli.err, "[DEPRECATED] The format 'URL|- [REPOSITORY [TAG]]' has been deprecated. Please use URL|- [REPOSITORY[:TAG]]\n")
		v.Set("tag", cmd.Arg(2))
	}

	if repository != "" {
		//Check if the given image name can be resolved
		repo, _ := parsers.ParseRepositoryTag(repository)
		if err := registry.ValidateRepositoryName(repo); err != nil {
			return err
		}
	}

	var in io.Reader

	if src == "-" {
		in = cli.in
	}

	return cli.stream("POST", "/images/create?"+v.Encode(), in, cli.out, nil)
}

func (cli *DockerCli) CmdPush(args ...string) error {
	cmd := cli.Subcmd("push", "NAME[:TAG]", "Push an image or a repository to the registry", true)
	cmd.Require(flag.Exact, 1)

	utils.ParseFlags(cmd, args, true)

	name := cmd.Arg(0)

	cli.LoadConfigFile()

	remote, tag := parsers.ParseRepositoryTag(name)

	// Resolve the Repository name from fqn to RepositoryInfo
	repoInfo, err := registry.ParseRepositoryInfo(remote)
	if err != nil {
		return err
	}
	// Resolve the Auth config relevant for this server
	authConfig := cli.configFile.ResolveAuthConfig(repoInfo.Index)
	// If we're not using a custom registry, we know the restrictions
	// applied to repository names and can warn the user in advance.
	// Custom repositories can have different rules, and we must also
	// allow pushing by image ID.
	if repoInfo.Official {
		username := authConfig.Username
		if username == "" {
			username = "<user>"
		}
		return fmt.Errorf("You cannot push a \"root\" repository. Please rename your repository to <user>/<repo> (ex: %s/%s)", username, repoInfo.LocalName)
	}

	v := url.Values{}
	v.Set("tag", tag)

	body, _, err := readBody(cli.call("GET", "/images/"+remote+"/manifest?"+v.Encode(), nil, false))
	if err != nil {
		return err
	}

	js, err := libtrust.NewJSONSignature(body)
	if err != nil {
		return err
	}
	err = js.Sign(cli.key)
	if err != nil {
		return err
	}

	signedBody, err := js.PrettySignature("signatures")
	if err != nil {
		return err
	}

	push := func(authConfig registry.AuthConfig) error {
		buf, err := json.Marshal(authConfig)
		if err != nil {
			return err
		}
		registryAuthHeader := []string{
			base64.URLEncoding.EncodeToString(buf),
		}

		return cli.stream("POST", "/images/"+remote+"/push?"+v.Encode(), bytes.NewReader(signedBody), cli.out, map[string][]string{
			"X-Registry-Auth": registryAuthHeader,
		})
	}

	if err := push(authConfig); err != nil {
		if strings.Contains(err.Error(), "Status 401") {
			fmt.Fprintln(cli.out, "\nPlease login prior to push:")
			if err := cli.CmdLogin(repoInfo.Index.GetAuthConfigKey()); err != nil {
				return err
			}
			authConfig := cli.configFile.ResolveAuthConfig(repoInfo.Index)
			return push(authConfig)
		}
		return err
	}
	return nil
}

func (cli *DockerCli) CmdPull(args ...string) error {
	cmd := cli.Subcmd("pull", "NAME[:TAG]", "Pull an image or a repository from the registry", true)
	allTags := cmd.Bool([]string{"a", "-all-tags"}, false, "Download all tagged images in the repository")
	cmd.Require(flag.Exact, 1)

	utils.ParseFlags(cmd, args, true)

	var (
		v         = url.Values{}
		remote    = cmd.Arg(0)
		newRemote = remote
	)
	taglessRemote, tag := parsers.ParseRepositoryTag(remote)
	if tag == "" && !*allTags {
		newRemote = taglessRemote + ":" + graph.DEFAULTTAG
	}
	if tag != "" && *allTags {
		return fmt.Errorf("tag can't be used with --all-tags/-a")
	}

	v.Set("fromImage", newRemote)

	// Resolve the Repository name from fqn to RepositoryInfo
	repoInfo, err := registry.ParseRepositoryInfo(taglessRemote)
	if err != nil {
		return err
	}

	cli.LoadConfigFile()

	// Resolve the Auth config relevant for this server
	authConfig := cli.configFile.ResolveAuthConfig(repoInfo.Index)

	pull := func(authConfig registry.AuthConfig) error {
		buf, err := json.Marshal(authConfig)
		if err != nil {
			return err
		}
		registryAuthHeader := []string{
			base64.URLEncoding.EncodeToString(buf),
		}

		return cli.stream("POST", "/images/create?"+v.Encode(), nil, cli.out, map[string][]string{
			"X-Registry-Auth": registryAuthHeader,
		})
	}

	if err := pull(authConfig); err != nil {
		if strings.Contains(err.Error(), "Status 401") {
			fmt.Fprintln(cli.out, "\nPlease login prior to pull:")
			if err := cli.CmdLogin(repoInfo.Index.GetAuthConfigKey()); err != nil {
				return err
			}
			authConfig := cli.configFile.ResolveAuthConfig(repoInfo.Index)
			return pull(authConfig)
		}
		return err
	}

	return nil
}

func (cli *DockerCli) CmdImages(args ...string) error {
	cmd := cli.Subcmd("images", "[REPOSITORY]", "List images", true)
	quiet := cmd.Bool([]string{"q", "-quiet"}, false, "Only show numeric IDs")
	all := cmd.Bool([]string{"a", "-all"}, false, "Show all images (by default filter out the intermediate image layers)")
	noTrunc := cmd.Bool([]string{"#notrunc", "-no-trunc"}, false, "Don't truncate output")
	// FIXME: --viz and --tree are deprecated. Remove them in a future version.
	flViz := cmd.Bool([]string{"#v", "#viz", "#-viz"}, false, "Output graph in graphviz format")
	flTree := cmd.Bool([]string{"#t", "#tree", "#-tree"}, false, "Output graph in tree format")

	flFilter := opts.NewListOpts(nil)
	cmd.Var(&flFilter, []string{"f", "-filter"}, "Provide filter values (i.e., 'dangling=true')")
	cmd.Require(flag.Max, 1)

	utils.ParseFlags(cmd, args, true)

	// Consolidate all filter flags, and sanity check them early.
	// They'll get process in the daemon/server.
	imageFilterArgs := filters.Args{}
	for _, f := range flFilter.GetAll() {
		var err error
		imageFilterArgs, err = filters.ParseFlag(f, imageFilterArgs)
		if err != nil {
			return err
		}
	}

	matchName := cmd.Arg(0)
	// FIXME: --viz and --tree are deprecated. Remove them in a future version.
	if *flViz || *flTree {
		v := url.Values{
			"all": []string{"1"},
		}
		if len(imageFilterArgs) > 0 {
			filterJson, err := filters.ToParam(imageFilterArgs)
			if err != nil {
				return err
			}
			v.Set("filters", filterJson)
		}

		body, _, err := readBody(cli.call("GET", "/images/json?"+v.Encode(), nil, false))
		if err != nil {
			return err
		}

		outs := engine.NewTable("Created", 0)
		if _, err := outs.ReadListFrom(body); err != nil {
			return err
		}

		var (
			printNode  func(cli *DockerCli, noTrunc bool, image *engine.Env, prefix string)
			startImage *engine.Env

			roots    = engine.NewTable("Created", outs.Len())
			byParent = make(map[string]*engine.Table)
		)

		for _, image := range outs.Data {
			if image.Get("ParentId") == "" {
				roots.Add(image)
			} else {
				if children, exists := byParent[image.Get("ParentId")]; exists {
					children.Add(image)
				} else {
					byParent[image.Get("ParentId")] = engine.NewTable("Created", 1)
					byParent[image.Get("ParentId")].Add(image)
				}
			}

			if matchName != "" {
				if matchName == image.Get("Id") || matchName == utils.TruncateID(image.Get("Id")) {
					startImage = image
				}

				for _, repotag := range image.GetList("RepoTags") {
					if repotag == matchName {
						startImage = image
					}
				}
			}
		}

		if *flViz {
			fmt.Fprintf(cli.out, "digraph docker {\n")
			printNode = (*DockerCli).printVizNode
		} else {
			printNode = (*DockerCli).printTreeNode
		}

		if startImage != nil {
			root := engine.NewTable("Created", 1)
			root.Add(startImage)
			cli.WalkTree(*noTrunc, root, byParent, "", printNode)
		} else if matchName == "" {
			cli.WalkTree(*noTrunc, roots, byParent, "", printNode)
		}
		if *flViz {
			fmt.Fprintf(cli.out, " base [style=invisible]\n}\n")
		}
	} else {
		v := url.Values{}
		if len(imageFilterArgs) > 0 {
			filterJson, err := filters.ToParam(imageFilterArgs)
			if err != nil {
				return err
			}
			v.Set("filters", filterJson)
		}

		if cmd.NArg() == 1 {
			// FIXME rename this parameter, to not be confused with the filters flag
			v.Set("filter", matchName)
		}
		if *all {
			v.Set("all", "1")
		}

		body, _, err := readBody(cli.call("GET", "/images/json?"+v.Encode(), nil, false))

		if err != nil {
			return err
		}

		outs := engine.NewTable("Created", 0)
		if _, err := outs.ReadListFrom(body); err != nil {
			return err
		}

		w := tabwriter.NewWriter(cli.out, 20, 1, 3, ' ', 0)
		if !*quiet {
			fmt.Fprintln(w, "REPOSITORY\tTAG\tIMAGE ID\tCREATED\tVIRTUAL SIZE")
		}

		for _, out := range outs.Data {
			for _, repotag := range out.GetList("RepoTags") {

				repo, tag := parsers.ParseRepositoryTag(repotag)
				outID := out.Get("Id")
				if !*noTrunc {
					outID = utils.TruncateID(outID)
				}

				if !*quiet {
					fmt.Fprintf(w, "%s\t%s\t%s\t%s ago\t%s\n", repo, tag, outID, units.HumanDuration(time.Now().UTC().Sub(time.Unix(out.GetInt64("Created"), 0))), units.HumanSize(float64(out.GetInt64("VirtualSize"))))
				} else {
					fmt.Fprintln(w, outID)
				}
			}
		}

		if !*quiet {
			w.Flush()
		}
	}
	return nil
}

// FIXME: --viz and --tree are deprecated. Remove them in a future version.
func (cli *DockerCli) WalkTree(noTrunc bool, images *engine.Table, byParent map[string]*engine.Table, prefix string, printNode func(cli *DockerCli, noTrunc bool, image *engine.Env, prefix string)) {
	length := images.Len()
	if length > 1 {
		for index, image := range images.Data {
			if index+1 == length {
				printNode(cli, noTrunc, image, prefix+"└─")
				if subimages, exists := byParent[image.Get("Id")]; exists {
					cli.WalkTree(noTrunc, subimages, byParent, prefix+"  ", printNode)
				}
			} else {
				printNode(cli, noTrunc, image, prefix+"\u251C─")
				if subimages, exists := byParent[image.Get("Id")]; exists {
					cli.WalkTree(noTrunc, subimages, byParent, prefix+"\u2502 ", printNode)
				}
			}
		}
	} else {
		for _, image := range images.Data {
			printNode(cli, noTrunc, image, prefix+"└─")
			if subimages, exists := byParent[image.Get("Id")]; exists {
				cli.WalkTree(noTrunc, subimages, byParent, prefix+"  ", printNode)
			}
		}
	}
}

// FIXME: --viz and --tree are deprecated. Remove them in a future version.
func (cli *DockerCli) printVizNode(noTrunc bool, image *engine.Env, prefix string) {
	var (
		imageID  string
		parentID string
	)
	if noTrunc {
		imageID = image.Get("Id")
		parentID = image.Get("ParentId")
	} else {
		imageID = utils.TruncateID(image.Get("Id"))
		parentID = utils.TruncateID(image.Get("ParentId"))
	}
	if parentID == "" {
		fmt.Fprintf(cli.out, " base -> \"%s\" [style=invis]\n", imageID)
	} else {
		fmt.Fprintf(cli.out, " \"%s\" -> \"%s\"\n", parentID, imageID)
	}
	if image.GetList("RepoTags")[0] != "<none>:<none>" {
		fmt.Fprintf(cli.out, " \"%s\" [label=\"%s\\n%s\",shape=box,fillcolor=\"paleturquoise\",style=\"filled,rounded\"];\n",
			imageID, imageID, strings.Join(image.GetList("RepoTags"), "\\n"))
	}
}

// FIXME: --viz and --tree are deprecated. Remove them in a future version.
func (cli *DockerCli) printTreeNode(noTrunc bool, image *engine.Env, prefix string) {
	var imageID string
	if noTrunc {
		imageID = image.Get("Id")
	} else {
		imageID = utils.TruncateID(image.Get("Id"))
	}

	fmt.Fprintf(cli.out, "%s%s Virtual Size: %s", prefix, imageID, units.HumanSize(float64(image.GetInt64("VirtualSize"))))
	if image.GetList("RepoTags")[0] != "<none>:<none>" {
		fmt.Fprintf(cli.out, " Tags: %s\n", strings.Join(image.GetList("RepoTags"), ", "))
	} else {
		fmt.Fprint(cli.out, "\n")
	}
}

func (cli *DockerCli) CmdPs(args ...string) error {
	var (
		err error

		psFilterArgs = filters.Args{}
		v            = url.Values{}

		cmd      = cli.Subcmd("ps", "", "List containers", true)
		quiet    = cmd.Bool([]string{"q", "-quiet"}, false, "Only display numeric IDs")
		size     = cmd.Bool([]string{"s", "-size"}, false, "Display total file sizes")
		all      = cmd.Bool([]string{"a", "-all"}, false, "Show all containers. Only running containers are shown by default.")
		noTrunc  = cmd.Bool([]string{"#notrunc", "-no-trunc"}, false, "Don't truncate output")
		nLatest  = cmd.Bool([]string{"l", "-latest"}, false, "Show only the latest created container, include non-running ones.")
		since    = cmd.String([]string{"#sinceId", "#-since-id", "-since"}, "", "Show only containers created since Id or Name, include non-running ones.")
		before   = cmd.String([]string{"#beforeId", "#-before-id", "-before"}, "", "Show only container created before Id or Name, include non-running ones.")
		last     = cmd.Int([]string{"n"}, -1, "Show n last created containers, include non-running ones.")
		flFilter = opts.NewListOpts(nil)
	)
	cmd.Require(flag.Exact, 0)

	cmd.Var(&flFilter, []string{"f", "-filter"}, "Provide filter values. Valid filters:\nexited=<int> - containers with exit code of <int>\nstatus=(restarting|running|paused|exited)")

	utils.ParseFlags(cmd, args, true)
	if *last == -1 && *nLatest {
		*last = 1
	}

	if *all {
		v.Set("all", "1")
	}

	if *last != -1 {
		v.Set("limit", strconv.Itoa(*last))
	}

	if *since != "" {
		v.Set("since", *since)
	}

	if *before != "" {
		v.Set("before", *before)
	}

	if *size {
		v.Set("size", "1")
	}

	// Consolidate all filter flags, and sanity check them.
	// They'll get processed in the daemon/server.
	for _, f := range flFilter.GetAll() {
		if psFilterArgs, err = filters.ParseFlag(f, psFilterArgs); err != nil {
			return err
		}
	}

	if len(psFilterArgs) > 0 {
		filterJson, err := filters.ToParam(psFilterArgs)
		if err != nil {
			return err
		}

		v.Set("filters", filterJson)
	}

	body, _, err := readBody(cli.call("GET", "/containers/json?"+v.Encode(), nil, false))
	if err != nil {
		return err
	}

	outs := engine.NewTable("Created", 0)
	if _, err := outs.ReadListFrom(body); err != nil {
		return err
	}

	w := tabwriter.NewWriter(cli.out, 20, 1, 3, ' ', 0)
	if !*quiet {
		fmt.Fprint(w, "CONTAINER ID\tIMAGE\tCOMMAND\tCREATED\tSTATUS\tPORTS\tNAMES")

		if *size {
			fmt.Fprintln(w, "\tSIZE")
		} else {
			fmt.Fprint(w, "\n")
		}
	}

	stripNamePrefix := func(ss []string) []string {
		for i, s := range ss {
			ss[i] = s[1:]
		}

		return ss
	}

	for _, out := range outs.Data {
		outID := out.Get("Id")

		if !*noTrunc {
			outID = utils.TruncateID(outID)
		}

		if *quiet {
			fmt.Fprintln(w, outID)

			continue
		}

		var (
			outNames   = stripNamePrefix(out.GetList("Names"))
			outCommand = strconv.Quote(out.Get("Command"))
			ports      = engine.NewTable("", 0)
		)

		if !*noTrunc {
			outCommand = utils.Trunc(outCommand, 20)

			// only display the default name for the container with notrunc is passed
			for _, name := range outNames {
				if len(strings.Split(name, "/")) == 1 {
					outNames = []string{name}

					break
				}
			}
		}

		ports.ReadListFrom([]byte(out.Get("Ports")))

		image := out.Get("Image")
		if image == "" {
			image = "<no image>"
		}

		fmt.Fprintf(w, "%s\t%s\t%s\t%s ago\t%s\t%s\t%s\t", outID, image, outCommand,
			units.HumanDuration(time.Now().UTC().Sub(time.Unix(out.GetInt64("Created"), 0))),
			out.Get("Status"), api.DisplayablePorts(ports), strings.Join(outNames, ","))

		if *size {
			if out.GetInt("SizeRootFs") > 0 {
				fmt.Fprintf(w, "%s (virtual %s)\n", units.HumanSize(float64(out.GetInt64("SizeRw"))), units.HumanSize(float64(out.GetInt64("SizeRootFs"))))
			} else {
				fmt.Fprintf(w, "%s\n", units.HumanSize(float64(out.GetInt64("SizeRw"))))
			}

			continue
		}

		fmt.Fprint(w, "\n")
	}

	if !*quiet {
		w.Flush()
	}

	return nil
}

func (cli *DockerCli) CmdCommit(args ...string) error {
	cmd := cli.Subcmd("commit", "CONTAINER [REPOSITORY[:TAG]]", "Create a new image from a container's changes", true)
	flPause := cmd.Bool([]string{"p", "-pause"}, true, "Pause container during commit")
	flComment := cmd.String([]string{"m", "-message"}, "", "Commit message")
	flAuthor := cmd.String([]string{"a", "#author", "-author"}, "", "Author (e.g., \"John Hannibal Smith <hannibal@a-team.com>\")")
	// FIXME: --run is deprecated, it will be replaced with inline Dockerfile commands.
	flConfig := cmd.String([]string{"#run", "#-run"}, "", "This option is deprecated and will be removed in a future version in favor of inline Dockerfile-compatible commands")
	cmd.Require(flag.Max, 2)
	cmd.Require(flag.Min, 1)
	utils.ParseFlags(cmd, args, true)

	var (
		name            = cmd.Arg(0)
		repository, tag = parsers.ParseRepositoryTag(cmd.Arg(1))
	)

	//Check if the given image name can be resolved
	if repository != "" {
		if err := registry.ValidateRepositoryName(repository); err != nil {
			return err
		}
	}

	v := url.Values{}
	v.Set("container", name)
	v.Set("repo", repository)
	v.Set("tag", tag)
	v.Set("comment", *flComment)
	v.Set("author", *flAuthor)

	if *flPause != true {
		v.Set("pause", "0")
	}

	var (
		config *runconfig.Config
		env    engine.Env
	)
	if *flConfig != "" {
		config = &runconfig.Config{}
		if err := json.Unmarshal([]byte(*flConfig), config); err != nil {
			return err
		}
	}
	stream, _, err := cli.call("POST", "/commit?"+v.Encode(), config, false)
	if err != nil {
		return err
	}
	if err := env.Decode(stream); err != nil {
		return err
	}

	fmt.Fprintf(cli.out, "%s\n", env.Get("Id"))
	return nil
}

func (cli *DockerCli) CmdEvents(args ...string) error {
	cmd := cli.Subcmd("events", "", "Get real time events from the server", true)
	since := cmd.String([]string{"#since", "-since"}, "", "Show all events created since timestamp")
	until := cmd.String([]string{"-until"}, "", "Stream events until this timestamp")
	flFilter := opts.NewListOpts(nil)
	cmd.Var(&flFilter, []string{"f", "-filter"}, "Provide filter values (i.e., 'event=stop')")
	cmd.Require(flag.Exact, 0)

	utils.ParseFlags(cmd, args, true)

	var (
		v               = url.Values{}
		loc             = time.FixedZone(time.Now().Zone())
		eventFilterArgs = filters.Args{}
	)

	// Consolidate all filter flags, and sanity check them early.
	// They'll get process in the daemon/server.
	for _, f := range flFilter.GetAll() {
		var err error
		eventFilterArgs, err = filters.ParseFlag(f, eventFilterArgs)
		if err != nil {
			return err
		}
	}
	var setTime = func(key, value string) {
		format := timeutils.RFC3339NanoFixed
		if len(value) < len(format) {
			format = format[:len(value)]
		}
		if t, err := time.ParseInLocation(format, value, loc); err == nil {
			v.Set(key, strconv.FormatInt(t.Unix(), 10))
		} else {
			v.Set(key, value)
		}
	}
	if *since != "" {
		setTime("since", *since)
	}
	if *until != "" {
		setTime("until", *until)
	}
	if len(eventFilterArgs) > 0 {
		filterJson, err := filters.ToParam(eventFilterArgs)
		if err != nil {
			return err
		}
		v.Set("filters", filterJson)
	}
	if err := cli.stream("GET", "/events?"+v.Encode(), nil, cli.out, nil); err != nil {
		return err
	}
	return nil
}

func (cli *DockerCli) CmdExport(args ...string) error {
	cmd := cli.Subcmd("export", "CONTAINER", "Export the contents of a filesystem as a tar archive to STDOUT", true)
	cmd.Require(flag.Exact, 1)

	utils.ParseFlags(cmd, args, true)

	if err := cli.stream("GET", "/containers/"+cmd.Arg(0)+"/export", nil, cli.out, nil); err != nil {
		return err
	}
	return nil
}

func (cli *DockerCli) CmdDiff(args ...string) error {
	cmd := cli.Subcmd("diff", "CONTAINER", "Inspect changes on a container's filesystem", true)
	cmd.Require(flag.Exact, 1)

	utils.ParseFlags(cmd, args, true)

	body, _, err := readBody(cli.call("GET", "/containers/"+cmd.Arg(0)+"/changes", nil, false))

	if err != nil {
		return err
	}

	outs := engine.NewTable("", 0)
	if _, err := outs.ReadListFrom(body); err != nil {
		return err
	}
	for _, change := range outs.Data {
		var kind string
		switch change.GetInt("Kind") {
		case archive.ChangeModify:
			kind = "C"
		case archive.ChangeAdd:
			kind = "A"
		case archive.ChangeDelete:
			kind = "D"
		}
		fmt.Fprintf(cli.out, "%s %s\n", kind, change.Get("Path"))
	}
	return nil
}

func (cli *DockerCli) CmdLogs(args ...string) error {
	var (
		cmd    = cli.Subcmd("logs", "CONTAINER", "Fetch the logs of a container", true)
		follow = cmd.Bool([]string{"f", "-follow"}, false, "Follow log output")
		times  = cmd.Bool([]string{"t", "-timestamps"}, false, "Show timestamps")
		tail   = cmd.String([]string{"-tail"}, "all", "Output the specified number of lines at the end of logs (defaults to all logs)")
	)
	cmd.Require(flag.Exact, 1)

	utils.ParseFlags(cmd, args, true)

	name := cmd.Arg(0)

	stream, _, err := cli.call("GET", "/containers/"+name+"/json", nil, false)
	if err != nil {
		return err
	}

	env := engine.Env{}
	if err := env.Decode(stream); err != nil {
		return err
	}

	v := url.Values{}
	v.Set("stdout", "1")
	v.Set("stderr", "1")

	if *times {
		v.Set("timestamps", "1")
	}

	if *follow {
		v.Set("follow", "1")
	}
	v.Set("tail", *tail)

	return cli.streamHelper("GET", "/containers/"+name+"/logs?"+v.Encode(), env.GetSubEnv("Config").GetBool("Tty"), nil, cli.out, cli.err, nil)
}

func (cli *DockerCli) CmdAttach(args ...string) error {
	var (
		cmd     = cli.Subcmd("attach", "CONTAINER", "Attach to a running container", true)
		noStdin = cmd.Bool([]string{"#nostdin", "-no-stdin"}, false, "Do not attach STDIN")
		proxy   = cmd.Bool([]string{"#sig-proxy", "-sig-proxy"}, true, "Proxy all received signals to the process (non-TTY mode only). SIGCHLD, SIGKILL, and SIGSTOP are not proxied.")
	)
	cmd.Require(flag.Exact, 1)

	utils.ParseFlags(cmd, args, true)
	name := cmd.Arg(0)

	stream, _, err := cli.call("GET", "/containers/"+name+"/json", nil, false)
	if err != nil {
		return err
	}

	env := engine.Env{}
	if err := env.Decode(stream); err != nil {
		return err
	}

	if !env.GetSubEnv("State").GetBool("Running") {
		return fmt.Errorf("You cannot attach to a stopped container, start it first")
	}

	var (
		config = env.GetSubEnv("Config")
		tty    = config.GetBool("Tty")
	)

	if err := cli.CheckTtyInput(!*noStdin, tty); err != nil {
		return err
	}

	if tty && cli.isTerminalOut {
		if err := cli.monitorTtySize(cmd.Arg(0), false); err != nil {
			log.Debugf("Error monitoring TTY size: %s", err)
		}
	}

	var in io.ReadCloser

	v := url.Values{}
	v.Set("stream", "1")
	if !*noStdin && config.GetBool("OpenStdin") {
		v.Set("stdin", "1")
		in = cli.in
	}

	v.Set("stdout", "1")
	v.Set("stderr", "1")

	if *proxy && !tty {
		sigc := cli.forwardAllSignals(cmd.Arg(0))
		defer signal.StopCatch(sigc)
	}

	if err := cli.hijack("POST", "/containers/"+cmd.Arg(0)+"/attach?"+v.Encode(), tty, in, cli.out, cli.err, nil, nil); err != nil {
		return err
	}

	_, status, err := getExitCode(cli, cmd.Arg(0))
	if err != nil {
		return err
	}
	if status != 0 {
		return &utils.StatusError{StatusCode: status}
	}

	return nil
}

func (cli *DockerCli) CmdSearch(args ...string) error {
	cmd := cli.Subcmd("search", "TERM", "Search the Docker Hub for images", true)
	noTrunc := cmd.Bool([]string{"#notrunc", "-no-trunc"}, false, "Don't truncate output")
	trusted := cmd.Bool([]string{"#t", "#trusted", "#-trusted"}, false, "Only show trusted builds")
	automated := cmd.Bool([]string{"-automated"}, false, "Only show automated builds")
	stars := cmd.Int([]string{"s", "#stars", "-stars"}, 0, "Only displays with at least x stars")
	cmd.Require(flag.Exact, 1)

	utils.ParseFlags(cmd, args, true)

	v := url.Values{}
	v.Set("term", cmd.Arg(0))

	body, _, err := readBody(cli.call("GET", "/images/search?"+v.Encode(), nil, true))

	if err != nil {
		return err
	}
	outs := engine.NewTable("star_count", 0)
	if _, err := outs.ReadListFrom(body); err != nil {
		return err
	}
	w := tabwriter.NewWriter(cli.out, 10, 1, 3, ' ', 0)
	fmt.Fprintf(w, "NAME\tDESCRIPTION\tSTARS\tOFFICIAL\tAUTOMATED\n")
	for _, out := range outs.Data {
		if ((*automated || *trusted) && (!out.GetBool("is_trusted") && !out.GetBool("is_automated"))) || (*stars > out.GetInt("star_count")) {
			continue
		}
		desc := strings.Replace(out.Get("description"), "\n", " ", -1)
		desc = strings.Replace(desc, "\r", " ", -1)
		if !*noTrunc && len(desc) > 45 {
			desc = utils.Trunc(desc, 42) + "..."
		}
		fmt.Fprintf(w, "%s\t%s\t%d\t", out.Get("name"), desc, out.GetInt("star_count"))
		if out.GetBool("is_official") {
			fmt.Fprint(w, "[OK]")

		}
		fmt.Fprint(w, "\t")
		if out.GetBool("is_automated") || out.GetBool("is_trusted") {
			fmt.Fprint(w, "[OK]")
		}
		fmt.Fprint(w, "\n")
	}
	w.Flush()
	return nil
}

// Ports type - Used to parse multiple -p flags
type ports []int

func (cli *DockerCli) CmdTag(args ...string) error {
	cmd := cli.Subcmd("tag", "IMAGE[:TAG] [REGISTRYHOST/][USERNAME/]NAME[:TAG]", "Tag an image into a repository", true)
	force := cmd.Bool([]string{"f", "#force", "-force"}, false, "Force")
	cmd.Require(flag.Exact, 2)

	utils.ParseFlags(cmd, args, true)

	var (
		repository, tag = parsers.ParseRepositoryTag(cmd.Arg(1))
		v               = url.Values{}
	)

	//Check if the given image name can be resolved
	if err := registry.ValidateRepositoryName(repository); err != nil {
		return err
	}
	v.Set("repo", repository)
	v.Set("tag", tag)

	if *force {
		v.Set("force", "1")
	}

	if _, _, err := readBody(cli.call("POST", "/images/"+cmd.Arg(0)+"/tag?"+v.Encode(), nil, false)); err != nil {
		return err
	}
	return nil
}

func (cli *DockerCli) pullImage(image string) error {
	return cli.pullImageCustomOut(image, cli.out)
}

func (cli *DockerCli) pullImageCustomOut(image string, out io.Writer) error {
	v := url.Values{}
	repos, tag := parsers.ParseRepositoryTag(image)
	// pull only the image tagged 'latest' if no tag was specified
	if tag == "" {
		tag = graph.DEFAULTTAG
	}
	v.Set("fromImage", repos)
	v.Set("tag", tag)

	// Resolve the Repository name from fqn to RepositoryInfo
	repoInfo, err := registry.ParseRepositoryInfo(repos)
	if err != nil {
		return err
	}

	// Load the auth config file, to be able to pull the image
	cli.LoadConfigFile()

	// Resolve the Auth config relevant for this server
	authConfig := cli.configFile.ResolveAuthConfig(repoInfo.Index)
	buf, err := json.Marshal(authConfig)
	if err != nil {
		return err
	}

	registryAuthHeader := []string{
		base64.URLEncoding.EncodeToString(buf),
	}
	if err = cli.stream("POST", "/images/create?"+v.Encode(), nil, out, map[string][]string{"X-Registry-Auth": registryAuthHeader}); err != nil {
		return err
	}
	return nil
}

type cidFile struct {
	path    string
	file    *os.File
	written bool
}

func newCIDFile(path string) (*cidFile, error) {
	if _, err := os.Stat(path); err == nil {
		return nil, fmt.Errorf("Container ID file found, make sure the other container isn't running or delete %s", path)
	}

	f, err := os.Create(path)
	if err != nil {
		return nil, fmt.Errorf("Failed to create the container ID file: %s", err)
	}

	return &cidFile{path: path, file: f}, nil
}

func (cid *cidFile) Close() error {
	cid.file.Close()

	if !cid.written {
		if err := os.Remove(cid.path); err != nil {
			return fmt.Errorf("failed to remove the CID file '%s': %s \n", cid.path, err)
		}
	}

	return nil
}

func (cid *cidFile) Write(id string) error {
	if _, err := cid.file.Write([]byte(id)); err != nil {
		return fmt.Errorf("Failed to write the container ID to the file: %s", err)
	}
	cid.written = true
	return nil
}

func (cli *DockerCli) createContainer(config *runconfig.Config, hostConfig *runconfig.HostConfig, cidfile, name string) (engine.Env, error) {
	containerValues := url.Values{}
	if name != "" {
		containerValues.Set("name", name)
	}

	mergedConfig := runconfig.MergeConfigs(config, hostConfig)

	var containerIDFile *cidFile
	if cidfile != "" {
		var err error
		if containerIDFile, err = newCIDFile(cidfile); err != nil {
			return nil, err
		}
		defer containerIDFile.Close()
	}

	//create the container
	stream, statusCode, err := cli.call("POST", "/containers/create?"+containerValues.Encode(), mergedConfig, false)
	//if image not found try to pull it
	if statusCode == 404 {
		repo, tag := parsers.ParseRepositoryTag(config.Image)
		if tag == "" {
			tag = graph.DEFAULTTAG
		}
		fmt.Fprintf(cli.err, "Unable to find image '%s:%s' locally\n", repo, tag)

		// we don't want to write to stdout anything apart from container.ID
		if err = cli.pullImageCustomOut(config.Image, cli.err); err != nil {
			return nil, err
		}
		// Retry
		if stream, _, err = cli.call("POST", "/containers/create?"+containerValues.Encode(), mergedConfig, false); err != nil {
			return nil, err
		}
	} else if err != nil {
		return nil, err
	}

	var result engine.Env
	if err := result.Decode(stream); err != nil {
		return nil, err
	}

	for _, warning := range result.GetList("Warnings") {
		fmt.Fprintf(cli.err, "WARNING: %s\n", warning)
	}

	if containerIDFile != nil {
		if err = containerIDFile.Write(result.Get("Id")); err != nil {
			return nil, err
		}
	}

	return result, nil

}

func (cli *DockerCli) CmdCreate(args ...string) error {
	cmd := cli.Subcmd("create", "IMAGE [COMMAND] [ARG...]", "Create a new container", true)

	// These are flags not stored in Config/HostConfig
	var (
		flName = cmd.String([]string{"-name"}, "", "Assign a name to the container")
	)

	config, hostConfig, cmd, err := runconfig.Parse(cmd, args)
	if err != nil {
		utils.ReportError(cmd, err.Error(), true)
	}
	if config.Image == "" {
		cmd.Usage()
		return nil
	}

	createResult, err := cli.createContainer(config, hostConfig, hostConfig.ContainerIDFile, *flName)
	if err != nil {
		return err
	}

	fmt.Fprintf(cli.out, "%s\n", createResult.Get("Id"))

	return nil
}

func (cli *DockerCli) CmdRun(args ...string) error {
	// FIXME: just use runconfig.Parse already
	cmd := cli.Subcmd("run", "IMAGE [COMMAND] [ARG...]", "Run a command in a new container", true)

	// These are flags not stored in Config/HostConfig
	var (
		flAutoRemove = cmd.Bool([]string{"#rm", "-rm"}, false, "Automatically remove the container when it exits (incompatible with -d)")
		flDetach     = cmd.Bool([]string{"d", "-detach"}, false, "Detached mode: run the container in the background and print the new container ID")
		flSigProxy   = cmd.Bool([]string{"#sig-proxy", "-sig-proxy"}, true, "Proxy received signals to the process (non-TTY mode only). SIGCHLD, SIGSTOP, and SIGKILL are not proxied.")
		flName       = cmd.String([]string{"#name", "-name"}, "", "Assign a name to the container")
		flAttach     *opts.ListOpts

		ErrConflictAttachDetach               = fmt.Errorf("Conflicting options: -a and -d")
		ErrConflictRestartPolicyAndAutoRemove = fmt.Errorf("Conflicting options: --restart and --rm")
		ErrConflictDetachAutoRemove           = fmt.Errorf("Conflicting options: --rm and -d")
	)

	config, hostConfig, cmd, err := runconfig.Parse(cmd, args)
	// just in case the Parse does not exit
	if err != nil {
		utils.ReportError(cmd, err.Error(), true)
	}
	if config.Image == "" {
		cmd.Usage()
		return nil
	}

	if !*flDetach {
		if err := cli.CheckTtyInput(config.AttachStdin, config.Tty); err != nil {
			return err
		}
	} else {
		if fl := cmd.Lookup("attach"); fl != nil {
			flAttach = fl.Value.(*opts.ListOpts)
			if flAttach.Len() != 0 {
				return ErrConflictAttachDetach
			}
		}
		if *flAutoRemove {
			return ErrConflictDetachAutoRemove
		}

		config.AttachStdin = false
		config.AttachStdout = false
		config.AttachStderr = false
		config.StdinOnce = false
	}

	// Disable flSigProxy when in TTY mode
	sigProxy := *flSigProxy
	if config.Tty {
		sigProxy = false
	}

	runResult, err := cli.createContainer(config, hostConfig, hostConfig.ContainerIDFile, *flName)
	if err != nil {
		return err
	}

	if sigProxy {
		sigc := cli.forwardAllSignals(runResult.Get("Id"))
		defer signal.StopCatch(sigc)
	}

	var (
		waitDisplayId chan struct{}
		errCh         chan error
	)

	if !config.AttachStdout && !config.AttachStderr {
		// Make this asynchronous to allow the client to write to stdin before having to read the ID
		waitDisplayId = make(chan struct{})
		go func() {
			defer close(waitDisplayId)
			fmt.Fprintf(cli.out, "%s\n", runResult.Get("Id"))
		}()
	}

	if *flAutoRemove && (hostConfig.RestartPolicy.Name == "always" || hostConfig.RestartPolicy.Name == "on-failure") {
		return ErrConflictRestartPolicyAndAutoRemove
	}

	// We need to instantiate the chan because the select needs it. It can
	// be closed but can't be uninitialized.
	hijacked := make(chan io.Closer)

	// Block the return until the chan gets closed
	defer func() {
		log.Debugf("End of CmdRun(), Waiting for hijack to finish.")
		if _, ok := <-hijacked; ok {
			log.Errorf("Hijack did not finish (chan still open)")
		}
	}()

	if config.AttachStdin || config.AttachStdout || config.AttachStderr {
		var (
			out, stderr io.Writer
			in          io.ReadCloser
			v           = url.Values{}
		)
		v.Set("stream", "1")

		if config.AttachStdin {
			v.Set("stdin", "1")
			in = cli.in
		}
		if config.AttachStdout {
			v.Set("stdout", "1")
			out = cli.out
		}
		if config.AttachStderr {
			v.Set("stderr", "1")
			if config.Tty {
				stderr = cli.out
			} else {
				stderr = cli.err
			}
		}

		errCh = promise.Go(func() error {
			return cli.hijack("POST", "/containers/"+runResult.Get("Id")+"/attach?"+v.Encode(), config.Tty, in, out, stderr, hijacked, nil)
		})
	} else {
		close(hijacked)
	}

	// Acknowledge the hijack before starting
	select {
	case closer := <-hijacked:
		// Make sure that the hijack gets closed when returning (results
		// in closing the hijack chan and freeing server's goroutines)
		if closer != nil {
			defer closer.Close()
		}
	case err := <-errCh:
		if err != nil {
			log.Debugf("Error hijack: %s", err)
			return err
		}
	}

	//start the container
	if _, _, err = readBody(cli.call("POST", "/containers/"+runResult.Get("Id")+"/start", nil, false)); err != nil {
		return err
	}

	if (config.AttachStdin || config.AttachStdout || config.AttachStderr) && config.Tty && cli.isTerminalOut {
		if err := cli.monitorTtySize(runResult.Get("Id"), false); err != nil {
			log.Errorf("Error monitoring TTY size: %s", err)
		}
	}

	if errCh != nil {
		if err := <-errCh; err != nil {
			log.Debugf("Error hijack: %s", err)
			return err
		}
	}

	// Detached mode: wait for the id to be displayed and return.
	if !config.AttachStdout && !config.AttachStderr {
		// Detached mode
		<-waitDisplayId
		return nil
	}

	var status int

	// Attached mode
	if *flAutoRemove {
		// Autoremove: wait for the container to finish, retrieve
		// the exit code and remove the container
		if _, _, err := readBody(cli.call("POST", "/containers/"+runResult.Get("Id")+"/wait", nil, false)); err != nil {
			return err
		}
		if _, status, err = getExitCode(cli, runResult.Get("Id")); err != nil {
			return err
		}
		if _, _, err := readBody(cli.call("DELETE", "/containers/"+runResult.Get("Id")+"?v=1", nil, false)); err != nil {
			return err
		}
	} else {
		// No Autoremove: Simply retrieve the exit code
		if !config.Tty {
			// In non-TTY mode, we can't detach, so we must wait for container exit
			if status, err = waitForExit(cli, runResult.Get("Id")); err != nil {
				return err
			}
		} else {
			// In TTY mode, there is a race: if the process dies too slowly, the state could
			// be updated after the getExitCode call and result in the wrong exit code being reported
			if _, status, err = getExitCode(cli, runResult.Get("Id")); err != nil {
				return err
			}
		}
	}
	if status != 0 {
		return &utils.StatusError{StatusCode: status}
	}
	return nil
}

func (cli *DockerCli) CmdCp(args ...string) error {
	cmd := cli.Subcmd("cp", "CONTAINER:PATH HOSTPATH", "Copy files/folders from the PATH to the HOSTPATH", true)
	cmd.Require(flag.Exact, 2)

	utils.ParseFlags(cmd, args, true)

	var copyData engine.Env
	info := strings.Split(cmd.Arg(0), ":")

	if len(info) != 2 {
		return fmt.Errorf("Error: Path not specified")
	}

	copyData.Set("Resource", info[1])
	copyData.Set("HostPath", cmd.Arg(1))

	stream, statusCode, err := cli.call("POST", "/containers/"+info[0]+"/copy", copyData, false)
	if stream != nil {
		defer stream.Close()
	}
	if statusCode == 404 {
		return fmt.Errorf("No such container: %v", info[0])
	}
	if err != nil {
		return err
	}

	if statusCode == 200 {
		if err := archive.Untar(stream, copyData.Get("HostPath"), &archive.TarOptions{NoLchown: true}); err != nil {
			return err
		}
	}
	return nil
}

func (cli *DockerCli) CmdSave(args ...string) error {
	cmd := cli.Subcmd("save", "IMAGE [IMAGE...]", "Save an image(s) to a tar archive (streamed to STDOUT by default)", true)
	outfile := cmd.String([]string{"o", "-output"}, "", "Write to an file, instead of STDOUT")
	cmd.Require(flag.Min, 1)

	utils.ParseFlags(cmd, args, true)

	var (
		output io.Writer = cli.out
		err    error
	)
	if *outfile != "" {
		output, err = os.Create(*outfile)
		if err != nil {
			return err
		}
	} else if cli.isTerminalOut {
		return errors.New("Cowardly refusing to save to a terminal. Use the -o flag or redirect.")
	}

	if len(cmd.Args()) == 1 {
		image := cmd.Arg(0)
		if err := cli.stream("GET", "/images/"+image+"/get", nil, output, nil); err != nil {
			return err
		}
	} else {
		v := url.Values{}
		for _, arg := range cmd.Args() {
			v.Add("names", arg)
		}
		if err := cli.stream("GET", "/images/get?"+v.Encode(), nil, output, nil); err != nil {
			return err
		}
	}
	return nil
}

func (cli *DockerCli) CmdLoad(args ...string) error {
	cmd := cli.Subcmd("load", "", "Load an image from a tar archive on STDIN", true)
	infile := cmd.String([]string{"i", "-input"}, "", "Read from a tar archive file, instead of STDIN")
	cmd.Require(flag.Exact, 0)

	utils.ParseFlags(cmd, args, true)

	var (
		input io.Reader = cli.in
		err   error
	)
	if *infile != "" {
		input, err = os.Open(*infile)
		if err != nil {
			return err
		}
	}
	if err := cli.stream("POST", "/images/load", input, cli.out, nil); err != nil {
		return err
	}
	return nil
}

func (cli *DockerCli) CmdExec(args ...string) error {
	cmd := cli.Subcmd("exec", "CONTAINER COMMAND [ARG...]", "Run a command in a running container", true)

	execConfig, err := runconfig.ParseExec(cmd, args)
	// just in case the ParseExec does not exit
	if execConfig.Container == "" || err != nil {
		return &utils.StatusError{StatusCode: 1}
	}

	stream, _, err := cli.call("POST", "/containers/"+execConfig.Container+"/exec", execConfig, false)
	if err != nil {
		return err
	}

	var execResult engine.Env
	if err := execResult.Decode(stream); err != nil {
		return err
	}

	execID := execResult.Get("Id")

	if execID == "" {
		fmt.Fprintf(cli.out, "exec ID empty")
		return nil
	}

	if !execConfig.Detach {
		if err := cli.CheckTtyInput(execConfig.AttachStdin, execConfig.Tty); err != nil {
			return err
		}
	} else {
		if _, _, err := readBody(cli.call("POST", "/exec/"+execID+"/start", execConfig, false)); err != nil {
			return err
		}
		// For now don't print this - wait for when we support exec wait()
		// fmt.Fprintf(cli.out, "%s\n", execID)
		return nil
	}

	// Interactive exec requested.
	var (
		out, stderr io.Writer
		in          io.ReadCloser
		hijacked    = make(chan io.Closer)
		errCh       chan error
	)

	// Block the return until the chan gets closed
	defer func() {
		log.Debugf("End of CmdExec(), Waiting for hijack to finish.")
		if _, ok := <-hijacked; ok {
			log.Errorf("Hijack did not finish (chan still open)")
		}
	}()

	if execConfig.AttachStdin {
		in = cli.in
	}
	if execConfig.AttachStdout {
		out = cli.out
	}
	if execConfig.AttachStderr {
		if execConfig.Tty {
			stderr = cli.out
		} else {
			stderr = cli.err
		}
	}
	errCh = promise.Go(func() error {
		return cli.hijack("POST", "/exec/"+execID+"/start", execConfig.Tty, in, out, stderr, hijacked, execConfig)
	})

	// Acknowledge the hijack before starting
	select {
	case closer := <-hijacked:
		// Make sure that hijack gets closed when returning. (result
		// in closing hijack chan and freeing server's goroutines.
		if closer != nil {
			defer closer.Close()
		}
	case err := <-errCh:
		if err != nil {
			log.Debugf("Error hijack: %s", err)
			return err
		}
	}

	if execConfig.Tty && cli.isTerminalIn {
		if err := cli.monitorTtySize(execID, true); err != nil {
			log.Errorf("Error monitoring TTY size: %s", err)
		}
	}

	if err := <-errCh; err != nil {
		log.Debugf("Error hijack: %s", err)
		return err
	}

	var status int
	if _, status, err = getExecExitCode(cli, execID); err != nil {
		return err
	}

	if status != 0 {
		return &utils.StatusError{StatusCode: status}
	}

	return nil
}

type containerStats struct {
	Name             string
	CpuPercentage    float64
	Memory           float64
	MemoryLimit      float64
	MemoryPercentage float64
	NetworkRx        float64
	NetworkTx        float64
	mu               sync.RWMutex
	err              error
}

func (s *containerStats) Collect(stream io.ReadCloser) {
	defer stream.Close()
	var (
		previousCpu    uint64
		previousSystem uint64
		start          = true
		dec            = json.NewDecoder(stream)
		u              = make(chan error, 1)
	)
	go func() {
		for {
			var v *stats.Stats
			if err := dec.Decode(&v); err != nil {
				u <- err
				return
			}
			var (
				memPercent = float64(v.MemoryStats.Usage) / float64(v.MemoryStats.Limit) * 100.0
				cpuPercent = 0.0
			)
			if !start {
				cpuPercent = calcuateCpuPercent(previousCpu, previousSystem, v)
			}
			start = false
			s.mu.Lock()
			s.CpuPercentage = cpuPercent
			s.Memory = float64(v.MemoryStats.Usage)
			s.MemoryLimit = float64(v.MemoryStats.Limit)
			s.MemoryPercentage = memPercent
			s.NetworkRx = float64(v.Network.RxBytes)
			s.NetworkTx = float64(v.Network.TxBytes)
			s.mu.Unlock()
			previousCpu = v.CpuStats.CpuUsage.TotalUsage
			previousSystem = v.CpuStats.SystemUsage
			u <- nil
		}
	}()
	for {
		select {
		case <-time.After(2 * time.Second):
			// zero out the values if we have not received an update within
			// the specified duration.
			s.mu.Lock()
			s.CpuPercentage = 0
			s.Memory = 0
			s.MemoryPercentage = 0
			s.mu.Unlock()
		case err := <-u:
			if err != nil {
				s.mu.Lock()
				s.err = err
				s.mu.Unlock()
				return
			}
		}
	}
}

func (s *containerStats) Display(w io.Writer) error {
	s.mu.RLock()
	defer s.mu.RUnlock()
	if s.err != nil {
		return s.err
	}
	fmt.Fprintf(w, "%s\t%.2f%%\t%s/%s\t%.2f%%\t%s/%s\n",
		s.Name,
		s.CpuPercentage,
		units.BytesSize(s.Memory), units.BytesSize(s.MemoryLimit),
		s.MemoryPercentage,
		units.BytesSize(s.NetworkRx), units.BytesSize(s.NetworkTx))
	return nil
}

func (cli *DockerCli) CmdStats(args ...string) error {
	cmd := cli.Subcmd("stats", "CONTAINER", "Display a live stream of one or more containers' resource usage statistics", true)
	cmd.Require(flag.Min, 1)
	utils.ParseFlags(cmd, args, true)

	names := cmd.Args()
	sort.Strings(names)
	var cStats []*containerStats
	for _, n := range names {
		s := &containerStats{Name: n}
		cStats = append(cStats, s)
		stream, _, err := cli.call("GET", "/containers/"+n+"/stats", nil, false)
		if err != nil {
			return err
		}
		go s.Collect(stream)
	}
	w := tabwriter.NewWriter(cli.out, 20, 1, 3, ' ', 0)
	for _ = range time.Tick(500 * time.Millisecond) {
		fmt.Fprint(cli.out, "\033[2J")
		fmt.Fprint(cli.out, "\033[H")
		fmt.Fprintln(w, "CONTAINER\tCPU %\tMEM USAGE/LIMIT\tMEM %\tNET I/O")
		toRemove := []int{}
		for i, s := range cStats {
			if err := s.Display(w); err != nil {
				toRemove = append(toRemove, i)
			}
		}
		for _, i := range toRemove {
			cStats = append(cStats[:i], cStats[i+1:]...)
		}
		if len(cStats) == 0 {
			return nil
		}
		w.Flush()
	}
	return nil
}

func calcuateCpuPercent(previousCpu, previousSystem uint64, v *stats.Stats) float64 {
	var (
		cpuPercent = 0.0
		// calculate the change for the cpu usage of the container in between readings
		cpuDelta = float64(v.CpuStats.CpuUsage.TotalUsage - previousCpu)
		// calculate the change for the entire system between readings
		systemDelta = float64(v.CpuStats.SystemUsage - previousSystem)
	)

	if systemDelta > 0.0 && cpuDelta > 0.0 {
		cpuPercent = (cpuDelta / systemDelta) * float64(len(v.CpuStats.CpuUsage.PercpuUsage)) * 100.0
	}
	return cpuPercent
}