Golang Job.Getenv方法代碼示例

// serveFd creates an http.Server and sets it up to serve given a socket activated
// argument.
func serveFd(addr string, job *engine.Job) error {
	r := createRouter(job.Eng, job.GetenvBool("Logging"), job.GetenvBool("EnableCors"), job.Getenv("CorsHeaders"), job.Getenv("Version"))

	ls, e := systemd.ListenFD(addr)
	if e != nil {
		return e
	}

	chErrors := make(chan error, len(ls))

	// We don't want to start serving on these sockets until the
	// daemon is initialized and installed. Otherwise required handlers
	// won't be ready.
	<-activationLock

	// Since ListenFD will return one or more sockets we have
	// to create a go func to spawn off multiple serves
	for i := range ls {
		listener := ls[i]
		go func() {
			httpSrv := http.Server{Handler: r}
			chErrors <- httpSrv.Serve(listener)
		}()
	}

	for i := 0; i < len(ls); i++ {
		err := <-chErrors
		if err != nil {
			return err
		}
	}

	return nil
}

func setupTcpHttp(addr string, job *engine.Job) (*HttpServer, error) {
	if !job.GetenvBool("TlsVerify") {
		log.Infof("/!\\ DON'T BIND ON ANY IP ADDRESS WITHOUT setting -tlsverify IF YOU DON'T KNOW WHAT YOU'RE DOING /!\\")
	}

	r := createRouter(job.Eng, job.GetenvBool("Logging"), job.GetenvBool("EnableCors"), job.Getenv("CorsHeaders"), job.Getenv("Version"))

	l, err := newListener("tcp", addr, job.GetenvBool("BufferRequests"))
	if err != nil {
		return nil, err
	}

	if err := allocateDaemonPort(addr); err != nil {
		return nil, err
	}

	if job.GetenvBool("Tls") || job.GetenvBool("TlsVerify") {
		var tlsCa string
		if job.GetenvBool("TlsVerify") {
			tlsCa = job.Getenv("TlsCa")
		}
		l, err = setupTls(job.Getenv("TlsCert"), job.Getenv("TlsKey"), tlsCa, l)
		if err != nil {
			return nil, err
		}
	}
	return &HttpServer{&http.Server{Addr: addr, Handler: r}, l}, nil
}

// Allocate a network interface
func Allocate(job *engine.Job) engine.Status {
	var (
		ip          net.IP
		mac         net.HardwareAddr
		err         error
		id          = job.Args[0]
		requestedIP = net.ParseIP(job.Getenv("RequestedIP"))
	)

	if requestedIP != nil {
		ip, err = ipallocator.RequestIP(bridgeNetwork, requestedIP)
	} else {
		ip, err = ipallocator.RequestIP(bridgeNetwork, nil)
	}
	if err != nil {
		return job.Error(err)
	}

	// If no explicit mac address was given, generate a random one.
	if mac, err = net.ParseMAC(job.Getenv("RequestedMac")); err != nil {
		mac = generateMacAddr(ip)
	}

	out := engine.Env{}
	out.Set("IP", ip.String())
	out.Set("Mask", bridgeNetwork.Mask.String())
	out.Set("Gateway", bridgeNetwork.IP.String())
	out.Set("MacAddress", mac.String())
	out.Set("Bridge", bridgeIface)

	size, _ := bridgeNetwork.Mask.Size()
	out.SetInt("IPPrefixLen", size)

	currentInterfaces.Set(id, &networkInterface{
		IP: ip,
	})

	out.WriteTo(job.Stdout)

	return engine.StatusOK
}

func LinkContainers(job *engine.Job) engine.Status {
	var (
		action       = job.Args[0]
		nfAction     iptables.Action
		childIP      = job.Getenv("ChildIP")
		parentIP     = job.Getenv("ParentIP")
		ignoreErrors = job.GetenvBool("IgnoreErrors")
		ports        = job.GetenvList("Ports")
	)

	switch action {
	case "-A":
		nfAction = iptables.Append
	case "-I":
		nfAction = iptables.Insert
	case "-D":
		nfAction = iptables.Delete
	default:
		return job.Errorf("Invalid action '%s' specified", action)
	}

	ip1 := net.ParseIP(parentIP)
	if ip1 == nil {
		return job.Errorf("parent IP '%s' is invalid", parentIP)
	}
	ip2 := net.ParseIP(childIP)
	if ip2 == nil {
		return job.Errorf("child IP '%s' is invalid", childIP)
	}

	chain := iptables.Chain{Name: "DOCKER", Bridge: bridgeIface}
	for _, p := range ports {
		port := nat.Port(p)
		if err := chain.Link(nfAction, ip1, ip2, port.Int(), port.Proto()); !ignoreErrors && err != nil {
			return job.Error(err)
		}
	}
	return engine.StatusOK
}

// CmdSet stores a new image in the graph.
// Images are stored in the graph using 4 elements:
//	- A user-defined ID
//	- A collection of metadata describing the image
//	- A directory tree stored as a tar archive (also called the "layer")
//	- A reference to a "parent" ID on top of which the layer should be applied
//
// NOTE: even though the parent ID is only useful in relation to the layer and how
// to apply it (ie you could represent the full directory tree as 'parent_layer + layer',
// it is treated as a top-level property of the image. This is an artifact of early
// design and should probably be cleaned up in the future to simplify the design.
//
// Syntax: image_set ID
// Input:
//	- Layer content must be streamed in tar format on stdin. An empty input is
//	valid and represents a nil layer.
//
//	- Image metadata must be passed in the command environment.
//		'json': a json-encoded object with all image metadata.
//			It will be stored as-is, without any encoding/decoding artifacts.
//			That is a requirement of the current registry client implementation,
//			because a re-encoded json might invalidate the image checksum at
//			the next upload, even with functionaly identical content.
func (s *TagStore) CmdSet(job *engine.Job) error {
	if len(job.Args) != 1 {
		return fmt.Errorf("usage: %s NAME", job.Name)
	}
	var (
		imgJSON = []byte(job.Getenv("json"))
		layer   = job.Stdin
	)
	if len(imgJSON) == 0 {
		return fmt.Errorf("mandatory key 'json' is not set")
	}
	// We have to pass an *image.Image object, even though it will be completely
	// ignored in favor of the redundant json data.
	// FIXME: the current prototype of Graph.Register is stupid and redundant.
	img, err := image.NewImgJSON(imgJSON)
	if err != nil {
		return err
	}
	if err := s.graph.Register(img, layer); err != nil {
		return err
	}
	return nil
}

func setupUnixHttp(addr string, job *engine.Job) (*HttpServer, error) {
	r := createRouter(job.Eng, job.GetenvBool("Logging"), job.GetenvBool("EnableCors"), job.Getenv("CorsHeaders"), job.Getenv("Version"))

	if err := syscall.Unlink(addr); err != nil && !os.IsNotExist(err) {
		return nil, err
	}
	mask := syscall.Umask(0777)
	defer syscall.Umask(mask)

	l, err := newListener("unix", addr, job.GetenvBool("BufferRequests"))
	if err != nil {
		return nil, err
	}

	if err := setSocketGroup(addr, job.Getenv("SocketGroup")); err != nil {
		return nil, err
	}

	if err := os.Chmod(addr, 0660); err != nil {
		return nil, err
	}

	return &HttpServer{&http.Server{Addr: addr, Handler: r}, l}, nil
}

func ContainerHostConfigFromJob(job *engine.Job) *HostConfig {
	if job.EnvExists("HostConfig") {
		hostConfig := HostConfig{}
		job.GetenvJson("HostConfig", &hostConfig)

		// FIXME: These are for backward compatibility, if people use these
		// options with `HostConfig`, we should still make them workable.
		if job.EnvExists("Memory") && hostConfig.Memory == 0 {
			hostConfig.Memory = job.GetenvInt64("Memory")
		}
		if job.EnvExists("MemorySwap") && hostConfig.MemorySwap == 0 {
			hostConfig.MemorySwap = job.GetenvInt64("MemorySwap")
		}
		if job.EnvExists("CpuShares") && hostConfig.CpuShares == 0 {
			hostConfig.CpuShares = job.GetenvInt64("CpuShares")
		}
		if job.EnvExists("Cpuset") && hostConfig.CpusetCpus == "" {
			hostConfig.CpusetCpus = job.Getenv("Cpuset")
		}

		return &hostConfig
	}

	hostConfig := &HostConfig{
		ContainerIDFile: job.Getenv("ContainerIDFile"),
		Memory:          job.GetenvInt64("Memory"),
		MemorySwap:      job.GetenvInt64("MemorySwap"),
		CpuShares:       job.GetenvInt64("CpuShares"),
		CpusetCpus:      job.Getenv("CpusetCpus"),
		Privileged:      job.GetenvBool("Privileged"),
		PublishAllPorts: job.GetenvBool("PublishAllPorts"),
		NetworkMode:     NetworkMode(job.Getenv("NetworkMode")),
		IpcMode:         IpcMode(job.Getenv("IpcMode")),
		PidMode:         PidMode(job.Getenv("PidMode")),
		ReadonlyRootfs:  job.GetenvBool("ReadonlyRootfs"),
		CgroupParent:    job.Getenv("CgroupParent"),
	}

	// FIXME: This is for backward compatibility, if people use `Cpuset`
	// in json, make it workable, we will only pass hostConfig.CpusetCpus
	// to execDriver.
	if job.EnvExists("Cpuset") && hostConfig.CpusetCpus == "" {
		hostConfig.CpusetCpus = job.Getenv("Cpuset")
	}

	job.GetenvJson("LxcConf", &hostConfig.LxcConf)
	job.GetenvJson("PortBindings", &hostConfig.PortBindings)
	job.GetenvJson("Devices", &hostConfig.Devices)
	job.GetenvJson("RestartPolicy", &hostConfig.RestartPolicy)
	job.GetenvJson("Ulimits", &hostConfig.Ulimits)
	job.GetenvJson("LogConfig", &hostConfig.LogConfig)
	hostConfig.SecurityOpt = job.GetenvList("SecurityOpt")
	if Binds := job.GetenvList("Binds"); Binds != nil {
		hostConfig.Binds = Binds
	}
	if Links := job.GetenvList("Links"); Links != nil {
		hostConfig.Links = Links
	}
	if Dns := job.GetenvList("Dns"); Dns != nil {
		hostConfig.Dns = Dns
	}
	if DnsSearch := job.GetenvList("DnsSearch"); DnsSearch != nil {
		hostConfig.DnsSearch = DnsSearch
	}
	if ExtraHosts := job.GetenvList("ExtraHosts"); ExtraHosts != nil {
		hostConfig.ExtraHosts = ExtraHosts
	}
	if VolumesFrom := job.GetenvList("VolumesFrom"); VolumesFrom != nil {
		hostConfig.VolumesFrom = VolumesFrom
	}
	if CapAdd := job.GetenvList("CapAdd"); CapAdd != nil {
		hostConfig.CapAdd = CapAdd
	}
	if CapDrop := job.GetenvList("CapDrop"); CapDrop != nil {
		hostConfig.CapDrop = CapDrop
	}

	return hostConfig
}

func ContainerConfigFromJob(job *engine.Job) *Config {
	config := &Config{
		Hostname:        job.Getenv("Hostname"),
		Domainname:      job.Getenv("Domainname"),
		User:            job.Getenv("User"),
		Memory:          job.GetenvInt64("Memory"),
		MemorySwap:      job.GetenvInt64("MemorySwap"),
		CpuShares:       job.GetenvInt64("CpuShares"),
		Cpuset:          job.Getenv("Cpuset"),
		AttachStdin:     job.GetenvBool("AttachStdin"),
		AttachStdout:    job.GetenvBool("AttachStdout"),
		AttachStderr:    job.GetenvBool("AttachStderr"),
		Tty:             job.GetenvBool("Tty"),
		OpenStdin:       job.GetenvBool("OpenStdin"),
		StdinOnce:       job.GetenvBool("StdinOnce"),
		Image:           job.Getenv("Image"),
		WorkingDir:      job.Getenv("WorkingDir"),
		NetworkDisabled: job.GetenvBool("NetworkDisabled"),
		MacAddress:      job.Getenv("MacAddress"),
	}
	job.GetenvJson("ExposedPorts", &config.ExposedPorts)
	job.GetenvJson("Volumes", &config.Volumes)
	if PortSpecs := job.GetenvList("PortSpecs"); PortSpecs != nil {
		config.PortSpecs = PortSpecs
	}
	if Env := job.GetenvList("Env"); Env != nil {
		config.Env = Env
	}
	if Cmd := job.GetenvList("Cmd"); Cmd != nil {
		config.Cmd = Cmd
	}

	job.GetenvJson("Labels", &config.Labels)

	if Entrypoint := job.GetenvList("Entrypoint"); Entrypoint != nil {
		config.Entrypoint = Entrypoint
	}
	return config
}

func (s *TagStore) CmdImport(job *engine.Job) error {
	if n := len(job.Args); n != 2 && n != 3 {
		return fmt.Errorf("Usage: %s SRC REPO [TAG]", job.Name)
	}
	var (
		src          = job.Args[0]
		repo         = job.Args[1]
		tag          string
		sf           = utils.NewStreamFormatter(job.GetenvBool("json"))
		archive      archive.ArchiveReader
		resp         *http.Response
		stdoutBuffer = bytes.NewBuffer(nil)
		newConfig    runconfig.Config
	)
	if len(job.Args) > 2 {
		tag = job.Args[2]
	}

	if src == "-" {
		archive = job.Stdin
	} else {
		u, err := url.Parse(src)
		if err != nil {
			return err
		}
		if u.Scheme == "" {
			u.Scheme = "http"
			u.Host = src
			u.Path = ""
		}
		job.Stdout.Write(sf.FormatStatus("", "Downloading from %s", u))
		resp, err = utils.Download(u.String())
		if err != nil {
			return err
		}
		progressReader := progressreader.New(progressreader.Config{
			In:        resp.Body,
			Out:       job.Stdout,
			Formatter: sf,
			Size:      int(resp.ContentLength),
			NewLines:  true,
			ID:        "",
			Action:    "Importing",
		})
		defer progressReader.Close()
		archive = progressReader
	}

	buildConfigJob := job.Eng.Job("build_config")
	buildConfigJob.Stdout.Add(stdoutBuffer)
	buildConfigJob.Setenv("changes", job.Getenv("changes"))
	// FIXME this should be remove when we remove deprecated config param
	buildConfigJob.Setenv("config", job.Getenv("config"))

	if err := buildConfigJob.Run(); err != nil {
		return err
	}
	if err := json.NewDecoder(stdoutBuffer).Decode(&newConfig); err != nil {
		return err
	}

	img, err := s.graph.Create(archive, "", "", "Imported from "+src, "", nil, &newConfig)
	if err != nil {
		return err
	}
	// Optionally register the image at REPO/TAG
	if repo != "" {
		if err := s.Set(repo, tag, img.ID, true); err != nil {
			return err
		}
	}
	job.Stdout.Write(sf.FormatStatus("", img.ID))
	logID := img.ID
	if tag != "" {
		logID = utils.ImageReference(logID, tag)
	}
	if err = job.Eng.Job("log", "import", logID, "").Run(); err != nil {
		log.Errorf("Error logging event 'import' for %s: %s", logID, err)
	}
	return nil
}

func (s *TagStore) CmdImages(job *engine.Job) error {
	var (
		allImages   map[string]*image.Image
		err         error
		filt_tagged = true
		filt_label  = false
	)

	imageFilters, err := filters.FromParam(job.Getenv("filters"))
	if err != nil {
		return err
	}
	for name := range imageFilters {
		if _, ok := acceptedImageFilterTags[name]; !ok {
			return fmt.Errorf("Invalid filter '%s'", name)
		}
	}

	if i, ok := imageFilters["dangling"]; ok {
		for _, value := range i {
			if strings.ToLower(value) == "true" {
				filt_tagged = false
			}
		}
	}

	_, filt_label = imageFilters["label"]

	if job.GetenvBool("all") && filt_tagged {
		allImages, err = s.graph.Map()
	} else {
		allImages, err = s.graph.Heads()
	}
	if err != nil {
		return err
	}
	lookup := make(map[string]*engine.Env)
	s.Lock()
	for repoName, repository := range s.Repositories {
		if job.Getenv("filter") != "" {
			if match, _ := path.Match(job.Getenv("filter"), repoName); !match {
				continue
			}
		}
		for ref, id := range repository {
			imgRef := utils.ImageReference(repoName, ref)
			image, err := s.graph.Get(id)
			if err != nil {
				log.Printf("Warning: couldn't load %s from %s: %s", id, imgRef, err)
				continue
			}

			if out, exists := lookup[id]; exists {
				if filt_tagged {
					if utils.DigestReference(ref) {
						out.SetList("RepoDigests", append(out.GetList("RepoDigests"), imgRef))
					} else { // Tag Ref.
						out.SetList("RepoTags", append(out.GetList("RepoTags"), imgRef))
					}
				}
			} else {
				// get the boolean list for if only the untagged images are requested
				delete(allImages, id)
				if !imageFilters.MatchKVList("label", image.ContainerConfig.Labels) {
					continue
				}
				if filt_tagged {
					out := &engine.Env{}
					out.SetJson("ParentId", image.Parent)
					out.SetJson("Id", image.ID)
					out.SetInt64("Created", image.Created.Unix())
					out.SetInt64("Size", image.Size)
					out.SetInt64("VirtualSize", image.GetParentsSize(0)+image.Size)
					out.SetJson("Labels", image.ContainerConfig.Labels)

					if utils.DigestReference(ref) {
						out.SetList("RepoTags", []string{})
						out.SetList("RepoDigests", []string{imgRef})
					} else {
						out.SetList("RepoTags", []string{imgRef})
						out.SetList("RepoDigests", []string{})
					}

					lookup[id] = out
				}
			}

		}
	}
	s.Unlock()

	outs := engine.NewTable("Created", len(lookup))
	for _, value := range lookup {
		outs.Add(value)
	}

	// Display images which aren't part of a repository/tag
	if job.Getenv("filter") == "" || filt_label {
		for _, image := range allImages {
			if !imageFilters.MatchKVList("label", image.ContainerConfig.Labels) {
//.........這裏部分代碼省略.........

// FIXME: Allow to interrupt current push when new push of same image is done.
func (s *TagStore) CmdPush(job *engine.Job) error {
	if n := len(job.Args); n != 1 {
		return fmt.Errorf("Usage: %s IMAGE", job.Name)
	}
	var (
		localName   = job.Args[0]
		sf          = utils.NewStreamFormatter(job.GetenvBool("json"))
		authConfig  = &registry.AuthConfig{}
		metaHeaders map[string][]string
	)

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

	tag := job.Getenv("tag")
	job.GetenvJson("authConfig", authConfig)
	job.GetenvJson("metaHeaders", &metaHeaders)

	if _, err := s.poolAdd("push", repoInfo.LocalName); err != nil {
		return err
	}
	defer s.poolRemove("push", repoInfo.LocalName)

	endpoint, err := repoInfo.GetEndpoint()
	if err != nil {
		return err
	}

	r, err := registry.NewSession(authConfig, registry.HTTPRequestFactory(metaHeaders), endpoint, false)
	if err != nil {
		return err
	}

	reposLen := 1
	if tag == "" {
		reposLen = len(s.Repositories[repoInfo.LocalName])
	}
	job.Stdout.Write(sf.FormatStatus("", "The push refers to a repository [%s] (len: %d)", repoInfo.CanonicalName, reposLen))
	// If it fails, try to get the repository
	localRepo, exists := s.Repositories[repoInfo.LocalName]
	if !exists {
		return fmt.Errorf("Repository does not exist: %s", repoInfo.LocalName)
	}

	if repoInfo.Index.Official || endpoint.Version == registry.APIVersion2 {
		err := s.pushV2Repository(r, localRepo, job.Stdout, repoInfo, tag, sf)
		if err == nil {
			return nil
		}

		if err != ErrV2RegistryUnavailable {
			return fmt.Errorf("Error pushing to registry: %s", err)
		}
	}

	if err := s.pushRepository(r, job.Stdout, repoInfo, localRepo, tag, sf); err != nil {
		return err
	}
	return nil

}

func InitDriver(job *engine.Job) engine.Status {
	var (
		network        *net.IPNet
		enableIPTables = job.GetenvBool("EnableIptables")
		icc            = job.GetenvBool("InterContainerCommunication")
		ipMasq         = job.GetenvBool("EnableIpMasq")
		ipForward      = job.GetenvBool("EnableIpForward")
		bridgeIP       = job.Getenv("BridgeIP")
		fixedCIDR      = job.Getenv("FixedCIDR")
	)

	if defaultIP := job.Getenv("DefaultBindingIP"); defaultIP != "" {
		defaultBindingIP = net.ParseIP(defaultIP)
	}

	bridgeIface = job.Getenv("BridgeIface")
	usingDefaultBridge := false
	if bridgeIface == "" {
		usingDefaultBridge = true
		bridgeIface = DefaultNetworkBridge
	}

	addr, err := networkdriver.GetIfaceAddr(bridgeIface)
	if err != nil {
		// If we're not using the default bridge, fail without trying to create it
		if !usingDefaultBridge {
			return job.Error(err)
		}
		// If the bridge interface is not found (or has no address), try to create it and/or add an address
		if err := configureBridge(bridgeIP); err != nil {
			return job.Error(err)
		}

		addr, err = networkdriver.GetIfaceAddr(bridgeIface)
		if err != nil {
			return job.Error(err)
		}
		network = addr.(*net.IPNet)
	} else {
		network = addr.(*net.IPNet)
		// validate that the bridge ip matches the ip specified by BridgeIP
		if bridgeIP != "" {
			bip, _, err := net.ParseCIDR(bridgeIP)
			if err != nil {
				return job.Error(err)
			}
			if !network.IP.Equal(bip) {
				return job.Errorf("bridge ip (%s) does not match existing bridge configuration %s", network.IP, bip)
			}
		}
	}

	// Configure iptables for link support
	if enableIPTables {
		if err := setupIPTables(addr, icc, ipMasq); err != nil {
			return job.Error(err)
		}
	}

	if ipForward {
		// Enable IPv4 forwarding
		if err := ioutil.WriteFile("/proc/sys/net/ipv4/ip_forward", []byte{'1', '\n'}, 0644); err != nil {
			job.Logf("WARNING: unable to enable IPv4 forwarding: %s\n", err)
		}
	}

	// We can always try removing the iptables
	if err := iptables.RemoveExistingChain("DOCKER", iptables.Nat); err != nil {
		return job.Error(err)
	}

	if enableIPTables {
		_, err := iptables.NewChain("DOCKER", bridgeIface, iptables.Nat)
		if err != nil {
			return job.Error(err)
		}
		chain, err := iptables.NewChain("DOCKER", bridgeIface, iptables.Filter)
		if err != nil {
			return job.Error(err)
		}
		portmapper.SetIptablesChain(chain)
	}

	bridgeNetwork = network
	if fixedCIDR != "" {
		_, subnet, err := net.ParseCIDR(fixedCIDR)
		if err != nil {
			return job.Error(err)
		}
		log.Debugf("Subnet: %v", subnet)
		if err := ipallocator.RegisterSubnet(bridgeNetwork, subnet); err != nil {
			return job.Error(err)
		}
	}

	// https://github.com/docker/docker/issues/2768
	job.Eng.Hack_SetGlobalVar("httpapi.bridgeIP", bridgeNetwork.IP)

	for name, f := range map[string]engine.Handler{
		"allocate_interface": Allocate,
//.........這裏部分代碼省略.........

// Allocate an external port and map it to the interface
func AllocatePort(job *engine.Job) engine.Status {
	var (
		err error

		ip            = defaultBindingIP
		id            = job.Args[0]
		hostIP        = job.Getenv("HostIP")
		hostPort      = job.GetenvInt("HostPort")
		containerPort = job.GetenvInt("ContainerPort")
		proto         = job.Getenv("Proto")
		network       = currentInterfaces.Get(id)
	)

	if hostIP != "" {
		ip = net.ParseIP(hostIP)
		if ip == nil {
			return job.Errorf("Bad parameter: invalid host ip %s", hostIP)
		}
	}

	// host ip, proto, and host port
	var container net.Addr
	switch proto {
	case "tcp":
		container = &net.TCPAddr{IP: network.IP, Port: containerPort}
	case "udp":
		container = &net.UDPAddr{IP: network.IP, Port: containerPort}
	default:
		return job.Errorf("unsupported address type %s", proto)
	}

	//
	// Try up to 10 times to get a port that's not already allocated.
	//
	// In the event of failure to bind, return the error that portmapper.Map
	// yields.
	//

	var host net.Addr
	for i := 0; i < MaxAllocatedPortAttempts; i++ {
		if host, err = portmapper.Map(container, ip, hostPort); err == nil {
			break
		}
		// There is no point in immediately retrying to map an explicitly
		// chosen port.
		if hostPort != 0 {
			job.Logf("Failed to allocate and map port %d: %s", hostPort, err)
			break
		}
		job.Logf("Failed to allocate and map port: %s, retry: %d", err, i+1)
	}

	if err != nil {
		return job.Error(err)
	}

	network.PortMappings = append(network.PortMappings, host)

	out := engine.Env{}
	switch netAddr := host.(type) {
	case *net.TCPAddr:
		out.Set("HostIP", netAddr.IP.String())
		out.SetInt("HostPort", netAddr.Port)
	case *net.UDPAddr:
		out.Set("HostIP", netAddr.IP.String())
		out.SetInt("HostPort", netAddr.Port)
	}
	if _, err := out.WriteTo(job.Stdout); err != nil {
		return job.Error(err)
	}

	return engine.StatusOK
}

func InitDriver(job *engine.Job) error {
	var (
		networkv4      *net.IPNet
		networkv6      *net.IPNet
		addrv4         net.Addr
		addrsv6        []net.Addr
		enableIPTables = job.GetenvBool("EnableIptables")
		enableIPv6     = job.GetenvBool("EnableIPv6")
		icc            = job.GetenvBool("InterContainerCommunication")
		ipMasq         = job.GetenvBool("EnableIpMasq")
		ipForward      = job.GetenvBool("EnableIpForward")
		bridgeIP       = job.Getenv("BridgeIP")
		bridgeIPv6     = "fe80::1/64"
		fixedCIDR      = job.Getenv("FixedCIDR")
		fixedCIDRv6    = job.Getenv("FixedCIDRv6")
	)

	if defaultIP := job.Getenv("DefaultBindingIP"); defaultIP != "" {
		defaultBindingIP = net.ParseIP(defaultIP)
	}

	bridgeIface = job.Getenv("BridgeIface")
	usingDefaultBridge := false
	if bridgeIface == "" {
		usingDefaultBridge = true
		bridgeIface = DefaultNetworkBridge
	}

	addrv4, addrsv6, err := networkdriver.GetIfaceAddr(bridgeIface)

	if err != nil {
		// No Bridge existent, create one
		// If we're not using the default bridge, fail without trying to create it
		if !usingDefaultBridge {
			return err
		}

		// If the iface is not found, try to create it
		if err := configureBridge(bridgeIP, bridgeIPv6, enableIPv6); err != nil {
			return err
		}

		addrv4, addrsv6, err = networkdriver.GetIfaceAddr(bridgeIface)
		if err != nil {
			return err
		}

		if fixedCIDRv6 != "" {
			// Setting route to global IPv6 subnet
			log.Infof("Adding route to IPv6 network %q via device %q", fixedCIDRv6, bridgeIface)
			if err := netlink.AddRoute(fixedCIDRv6, "", "", bridgeIface); err != nil {
				log.Fatalf("Could not add route to IPv6 network %q via device %q", fixedCIDRv6, bridgeIface)
			}
		}
	} else {
		// Bridge exists already, getting info...
		// Validate that the bridge ip matches the ip specified by BridgeIP
		if bridgeIP != "" {
			networkv4 = addrv4.(*net.IPNet)
			bip, _, err := net.ParseCIDR(bridgeIP)
			if err != nil {
				return err
			}
			if !networkv4.IP.Equal(bip) {
				return fmt.Errorf("Bridge ip (%s) does not match existing bridge configuration %s", networkv4.IP, bip)
			}
		}

		// A bridge might exist but not have any IPv6 addr associated with it yet
		// (for example, an existing Docker installation that has only been used
		// with IPv4 and docker0 already is set up) In that case, we can perform
		// the bridge init for IPv6 here, else we will error out below if --ipv6=true
		if len(addrsv6) == 0 && enableIPv6 {
			if err := setupIPv6Bridge(bridgeIPv6); err != nil {
				return err
			}
			// Recheck addresses now that IPv6 is setup on the bridge
			addrv4, addrsv6, err = networkdriver.GetIfaceAddr(bridgeIface)
			if err != nil {
				return err
			}
		}

		// TODO: Check if route to fixedCIDRv6 is set
	}

	if enableIPv6 {
		bip6, _, err := net.ParseCIDR(bridgeIPv6)
		if err != nil {
			return err
		}
		found := false
		for _, addrv6 := range addrsv6 {
			networkv6 = addrv6.(*net.IPNet)
			if networkv6.IP.Equal(bip6) {
				found = true
				break
			}
		}
		if !found {
//.........這裏部分代碼省略.........

// Allocate a network interface
func Allocate(job *engine.Job) error {
	var (
		ip            net.IP
		mac           net.HardwareAddr
		err           error
		id            = job.Args[0]
		requestedIP   = net.ParseIP(job.Getenv("RequestedIP"))
		requestedIPv6 = net.ParseIP(job.Getenv("RequestedIPv6"))
		globalIPv6    net.IP
	)

	ip, err = ipAllocator.RequestIP(bridgeIPv4Network, requestedIP)
	if err != nil {
		return err
	}

	// If no explicit mac address was given, generate a random one.
	if mac, err = net.ParseMAC(job.Getenv("RequestedMac")); err != nil {
		mac = generateMacAddr(ip)
	}

	if globalIPv6Network != nil {
		// If globalIPv6Network Size is at least a /80 subnet generate IPv6 address from MAC address
		netmask_ones, _ := globalIPv6Network.Mask.Size()
		if requestedIPv6 == nil && netmask_ones <= 80 {
			requestedIPv6 = make(net.IP, len(globalIPv6Network.IP))
			copy(requestedIPv6, globalIPv6Network.IP)
			for i, h := range mac {
				requestedIPv6[i+10] = h
			}
		}

		globalIPv6, err = ipAllocator.RequestIP(globalIPv6Network, requestedIPv6)
		if err != nil {
			log.Errorf("Allocator: RequestIP v6: %v", err)
			return err
		}
		log.Infof("Allocated IPv6 %s", globalIPv6)
	}

	out := engine.Env{}
	out.Set("IP", ip.String())
	out.Set("Mask", bridgeIPv4Network.Mask.String())
	out.Set("Gateway", bridgeIPv4Network.IP.String())
	out.Set("MacAddress", mac.String())
	out.Set("Bridge", bridgeIface)

	size, _ := bridgeIPv4Network.Mask.Size()
	out.SetInt("IPPrefixLen", size)

	// If linklocal IPv6
	localIPv6Net, err := linkLocalIPv6FromMac(mac.String())
	if err != nil {
		return err
	}
	localIPv6, _, _ := net.ParseCIDR(localIPv6Net)
	out.Set("LinkLocalIPv6", localIPv6.String())
	out.Set("MacAddress", mac.String())

	if globalIPv6Network != nil {
		out.Set("GlobalIPv6", globalIPv6.String())
		sizev6, _ := globalIPv6Network.Mask.Size()
		out.SetInt("GlobalIPv6PrefixLen", sizev6)
		out.Set("IPv6Gateway", bridgeIPv6Addr.String())
	}

	currentInterfaces.Set(id, &networkInterface{
		IP:   ip,
		IPv6: globalIPv6,
	})

	out.WriteTo(job.Stdout)

	return nil
}