// ContainerExecCreate sets up an exec in a running container.
func (d *Daemon) ContainerExecCreate(config *types.ExecConfig) (string, error) {
	container, err := d.getActiveContainer(config.Container)
	if err != nil {
		return "", err
	}

	cmd := strslice.New(config.Cmd...)
	entrypoint, args := d.getEntrypointAndArgs(strslice.New(), cmd)

	processConfig := &execdriver.ProcessConfig{
		CommonProcessConfig: execdriver.CommonProcessConfig{
			Tty:        config.Tty,
			Entrypoint: entrypoint,
			Arguments:  args,
		},
	}
	setPlatformSpecificExecProcessConfig(config, container, processConfig)

	execConfig := exec.NewConfig()
	execConfig.OpenStdin = config.AttachStdin
	execConfig.OpenStdout = config.AttachStdout
	execConfig.OpenStderr = config.AttachStderr
	execConfig.ProcessConfig = processConfig
	execConfig.ContainerID = container.ID

	d.registerExecCommand(container, execConfig)

	d.LogContainerEvent(container, "exec_create: "+execConfig.ProcessConfig.Entrypoint+" "+strings.Join(execConfig.ProcessConfig.Arguments, " "))

	return execConfig.ID, nil
}

// ENTRYPOINT /usr/sbin/nginx
//
// Set the entrypoint (which defaults to sh -c on linux, or cmd /S /C on Windows) to
// /usr/sbin/nginx. Will accept the CMD as the arguments to /usr/sbin/nginx.
//
// Handles command processing similar to CMD and RUN, only b.runConfig.Entrypoint
// is initialized at NewBuilder time instead of through argument parsing.
//
func entrypoint(b *Builder, args []string, attributes map[string]bool, original string) error {
	if err := b.flags.Parse(); err != nil {
		return err
	}

	parsed := handleJSONArgs(args, attributes)

	switch {
	case attributes["json"]:
		// ENTRYPOINT ["echo", "hi"]
		b.runConfig.Entrypoint = strslice.New(parsed...)
	case len(parsed) == 0:
		// ENTRYPOINT []
		b.runConfig.Entrypoint = nil
	default:
		// ENTRYPOINT echo hi
		if runtime.GOOS != "windows" {
			b.runConfig.Entrypoint = strslice.New("/bin/sh", "-c", parsed[0])
		} else {
			b.runConfig.Entrypoint = strslice.New("cmd", "/S", "/C", parsed[0])
		}
	}

	// when setting the entrypoint if a CMD was not explicitly set then
	// set the command to nil
	if !b.cmdSet {
		b.runConfig.Cmd = nil
	}

	if err := b.commit("", b.runConfig.Cmd, fmt.Sprintf("ENTRYPOINT %q", b.runConfig.Entrypoint)); err != nil {
		return err
	}

	return nil
}

// CMD foo
//
// Set the default command to run in the container (which may be empty).
// Argument handling is the same as RUN.
//
func cmd(b *Builder, args []string, attributes map[string]bool, original string) error {
	if err := b.flags.Parse(); err != nil {
		return err
	}

	cmdSlice := handleJSONArgs(args, attributes)

	if !attributes["json"] {
		if runtime.GOOS != "windows" {
			cmdSlice = append([]string{"/bin/sh", "-c"}, cmdSlice...)
		} else {
			cmdSlice = append([]string{"cmd", "/S", "/C"}, cmdSlice...)
		}
	}

	b.runConfig.Cmd = strslice.New(cmdSlice...)

	if err := b.commit("", b.runConfig.Cmd, fmt.Sprintf("CMD %q", cmdSlice)); err != nil {
		return err
	}

	if len(args) != 0 {
		b.cmdSet = true
	}

	return nil
}

func (b *Builder) commit(id string, autoCmd *strslice.StrSlice, comment string) error {
	if b.disableCommit {
		return nil
	}
	if b.image == "" && !b.noBaseImage {
		return fmt.Errorf("Please provide a source image with `from` prior to commit")
	}
	b.runConfig.Image = b.image
	if id == "" {
		cmd := b.runConfig.Cmd
		if runtime.GOOS != "windows" {
			b.runConfig.Cmd = strslice.New("/bin/sh", "-c", "#(nop) "+comment)
		} else {
			b.runConfig.Cmd = strslice.New("cmd", "/S /C", "REM (nop) "+comment)
		}
		defer func(cmd *strslice.StrSlice) { b.runConfig.Cmd = cmd }(cmd)

		hit, err := b.probeCache()
		if err != nil {
			return err
		} else if hit {
			return nil
		}
		id, err = b.create()
		if err != nil {
			return err
		}
	}

	// Note: Actually copy the struct
	autoConfig := *b.runConfig
	autoConfig.Cmd = autoCmd

	commitCfg := &types.ContainerCommitConfig{
		Author: b.maintainer,
		Pause:  true,
		Config: &autoConfig,
	}

	// Commit the container
	imageID, err := b.docker.Commit(id, commitCfg)
	if err != nil {
		return err
	}
	b.image = imageID
	return nil
}

func TestDecodeContainerConfig(t *testing.T) {

	var (
		fixtures []f
		image    string
	)

	if runtime.GOOS != "windows" {
		image = "ubuntu"
		fixtures = []f{
			{"fixtures/unix/container_config_1_14.json", strslice.New()},
			{"fixtures/unix/container_config_1_17.json", strslice.New("bash")},
			{"fixtures/unix/container_config_1_19.json", strslice.New("bash")},
		}
	} else {
		image = "windows"
		fixtures = []f{
			{"fixtures/windows/container_config_1_19.json", strslice.New("cmd")},
		}
	}

	for _, f := range fixtures {
		b, err := ioutil.ReadFile(f.file)
		if err != nil {
			t.Fatal(err)
		}

		c, h, err := DecodeContainerConfig(bytes.NewReader(b))
		if err != nil {
			t.Fatal(fmt.Errorf("Error parsing %s: %v", f, err))
		}

		if c.Image != image {
			t.Fatalf("Expected %s image, found %s\n", image, c.Image)
		}

		if c.Entrypoint.Len() != f.entrypoint.Len() {
			t.Fatalf("Expected %v, found %v\n", f.entrypoint, c.Entrypoint)
		}

		if h != nil && h.Memory != 1000 {
			t.Fatalf("Expected memory to be 1000, found %d\n", h.Memory)
		}
	}
}

// ContainerExecCreate sets up an exec in a running container.
func (d *Daemon) ContainerExecCreate(config *types.ExecConfig) (string, error) {
	container, err := d.getActiveContainer(config.Container)
	if err != nil {
		return "", err
	}

	cmd := strslice.New(config.Cmd...)
	entrypoint, args := d.getEntrypointAndArgs(strslice.New(), cmd)

	keys := []byte{}
	if config.DetachKeys != "" {
		keys, err = term.ToBytes(config.DetachKeys)
		if err != nil {
			logrus.Warnf("Wrong escape keys provided (%s, error: %s) using default : ctrl-p ctrl-q", config.DetachKeys, err.Error())
		}
	}

	processConfig := &execdriver.ProcessConfig{
		CommonProcessConfig: execdriver.CommonProcessConfig{
			Tty:        config.Tty,
			Entrypoint: entrypoint,
			Arguments:  args,
		},
	}
	setPlatformSpecificExecProcessConfig(config, container, processConfig)

	execConfig := exec.NewConfig()
	execConfig.OpenStdin = config.AttachStdin
	execConfig.OpenStdout = config.AttachStdout
	execConfig.OpenStderr = config.AttachStderr
	execConfig.ProcessConfig = processConfig
	execConfig.ContainerID = container.ID
	execConfig.DetachKeys = keys

	d.registerExecCommand(container, execConfig)

	d.LogContainerEvent(container, "exec_create: "+execConfig.ProcessConfig.Entrypoint+" "+strings.Join(execConfig.ProcessConfig.Arguments, " "))

	return execConfig.ID, nil
}

func (b *Builder) runContextCommand(args []string, allowRemote bool, allowLocalDecompression bool, cmdName string) error {
	if b.context == nil {
		return fmt.Errorf("No context given. Impossible to use %s", cmdName)
	}

	if len(args) < 2 {
		return fmt.Errorf("Invalid %s format - at least two arguments required", cmdName)
	}

	// Work in daemon-specific filepath semantics
	dest := filepath.FromSlash(args[len(args)-1]) // last one is always the dest

	b.runConfig.Image = b.image

	var infos []copyInfo

	// Loop through each src file and calculate the info we need to
	// do the copy (e.g. hash value if cached).  Don't actually do
	// the copy until we've looked at all src files
	var err error
	for _, orig := range args[0 : len(args)-1] {
		var fi builder.FileInfo
		decompress := allowLocalDecompression
		if urlutil.IsURL(orig) {
			if !allowRemote {
				return fmt.Errorf("Source can't be a URL for %s", cmdName)
			}
			fi, err = b.download(orig)
			if err != nil {
				return err
			}
			defer os.RemoveAll(filepath.Dir(fi.Path()))
			decompress = false
			infos = append(infos, copyInfo{fi, decompress})
			continue
		}
		// not a URL
		subInfos, err := b.calcCopyInfo(cmdName, orig, allowLocalDecompression, true)
		if err != nil {
			return err
		}

		infos = append(infos, subInfos...)
	}

	if len(infos) == 0 {
		return fmt.Errorf("No source files were specified")
	}
	if len(infos) > 1 && !strings.HasSuffix(dest, string(os.PathSeparator)) {
		return fmt.Errorf("When using %s with more than one source file, the destination must be a directory and end with a /", cmdName)
	}

	// For backwards compat, if there's just one info then use it as the
	// cache look-up string, otherwise hash 'em all into one
	var srcHash string
	var origPaths string

	if len(infos) == 1 {
		fi := infos[0].FileInfo
		origPaths = fi.Name()
		if hfi, ok := fi.(builder.Hashed); ok {
			srcHash = hfi.Hash()
		}
	} else {
		var hashs []string
		var origs []string
		for _, info := range infos {
			fi := info.FileInfo
			origs = append(origs, fi.Name())
			if hfi, ok := fi.(builder.Hashed); ok {
				hashs = append(hashs, hfi.Hash())
			}
		}
		hasher := sha256.New()
		hasher.Write([]byte(strings.Join(hashs, ",")))
		srcHash = "multi:" + hex.EncodeToString(hasher.Sum(nil))
		origPaths = strings.Join(origs, " ")
	}

	cmd := b.runConfig.Cmd
	if runtime.GOOS != "windows" {
		b.runConfig.Cmd = strslice.New("/bin/sh", "-c", fmt.Sprintf("#(nop) %s %s in %s", cmdName, srcHash, dest))
	} else {
		b.runConfig.Cmd = strslice.New("cmd", "/S", "/C", fmt.Sprintf("REM (nop) %s %s in %s", cmdName, srcHash, dest))
	}
	defer func(cmd *strslice.StrSlice) { b.runConfig.Cmd = cmd }(cmd)

	if hit, err := b.probeCache(); err != nil {
		return err
	} else if hit {
		return nil
	}

	container, err := b.docker.ContainerCreate(types.ContainerCreateConfig{Config: b.runConfig})
	if err != nil {
		return err
	}
	b.tmpContainers[container.ID] = struct{}{}

	comment := fmt.Sprintf("%s %s in %s", cmdName, origPaths, dest)
//.........这里部分代码省略.........

// Parse parses the specified args for the specified command and generates a Config,
// a HostConfig and returns them with the specified command.
// If the specified args are not valid, it will return an error.
func Parse(cmd *flag.FlagSet, args []string) (*container.Config, *container.HostConfig, *flag.FlagSet, error) {
	var (
		// FIXME: use utils.ListOpts for attach and volumes?
		flAttach            = opts.NewListOpts(opts.ValidateAttach)
		flVolumes           = opts.NewListOpts(nil)
		flTmpfs             = opts.NewListOpts(nil)
		flBlkioWeightDevice = NewWeightdeviceOpt(ValidateWeightDevice)
		flDeviceReadBps     = NewThrottledeviceOpt(ValidateThrottleBpsDevice)
		flDeviceWriteBps    = NewThrottledeviceOpt(ValidateThrottleBpsDevice)
		flLinks             = opts.NewListOpts(ValidateLink)
		flDeviceReadIOps    = NewThrottledeviceOpt(ValidateThrottleIOpsDevice)
		flDeviceWriteIOps   = NewThrottledeviceOpt(ValidateThrottleIOpsDevice)
		flEnv               = opts.NewListOpts(opts.ValidateEnv)
		flLabels            = opts.NewListOpts(opts.ValidateEnv)
		flDevices           = opts.NewListOpts(ValidateDevice)

		flUlimits = NewUlimitOpt(nil)

		flPublish           = opts.NewListOpts(nil)
		flExpose            = opts.NewListOpts(nil)
		flDNS               = opts.NewListOpts(opts.ValidateIPAddress)
		flDNSSearch         = opts.NewListOpts(opts.ValidateDNSSearch)
		flDNSOptions        = opts.NewListOpts(nil)
		flExtraHosts        = opts.NewListOpts(opts.ValidateExtraHost)
		flVolumesFrom       = opts.NewListOpts(nil)
		flEnvFile           = opts.NewListOpts(nil)
		flCapAdd            = opts.NewListOpts(nil)
		flCapDrop           = opts.NewListOpts(nil)
		flGroupAdd          = opts.NewListOpts(nil)
		flSecurityOpt       = opts.NewListOpts(nil)
		flLabelsFile        = opts.NewListOpts(nil)
		flLoggingOpts       = opts.NewListOpts(nil)
		flPrivileged        = cmd.Bool([]string{"-privileged"}, false, "Give extended privileges to this container")
		flPidMode           = cmd.String([]string{"-pid"}, "", "PID namespace to use")
		flUTSMode           = cmd.String([]string{"-uts"}, "", "UTS namespace to use")
		flPublishAll        = cmd.Bool([]string{"P", "-publish-all"}, false, "Publish all exposed ports to random ports")
		flStdin             = cmd.Bool([]string{"i", "-interactive"}, false, "Keep STDIN open even if not attached")
		flTty               = cmd.Bool([]string{"t", "-tty"}, false, "Allocate a pseudo-TTY")
		flOomKillDisable    = cmd.Bool([]string{"-oom-kill-disable"}, false, "Disable OOM Killer")
		flOomScoreAdj       = cmd.Int([]string{"-oom-score-adj"}, 0, "Tune host's OOM preferences (-1000 to 1000)")
		flContainerIDFile   = cmd.String([]string{"-cidfile"}, "", "Write the container ID to the file")
		flEntrypoint        = cmd.String([]string{"-entrypoint"}, "", "Overwrite the default ENTRYPOINT of the image")
		flHostname          = cmd.String([]string{"h", "-hostname"}, "", "Container host name")
		flMemoryString      = cmd.String([]string{"m", "-memory"}, "", "Memory limit")
		flMemoryReservation = cmd.String([]string{"-memory-reservation"}, "", "Memory soft limit")
		flMemorySwap        = cmd.String([]string{"-memory-swap"}, "", "Swap limit equal to memory plus swap: '-1' to enable unlimited swap")
		flKernelMemory      = cmd.String([]string{"-kernel-memory"}, "", "Kernel memory limit")
		flUser              = cmd.String([]string{"u", "-user"}, "", "Username or UID (format: <name|uid>[:<group|gid>])")
		flWorkingDir        = cmd.String([]string{"w", "-workdir"}, "", "Working directory inside the container")
		flCPUShares         = cmd.Int64([]string{"#c", "-cpu-shares"}, 0, "CPU shares (relative weight)")
		flCPUPeriod         = cmd.Int64([]string{"-cpu-period"}, 0, "Limit CPU CFS (Completely Fair Scheduler) period")
		flCPUQuota          = cmd.Int64([]string{"-cpu-quota"}, 0, "Limit CPU CFS (Completely Fair Scheduler) quota")
		flCpusetCpus        = cmd.String([]string{"-cpuset-cpus"}, "", "CPUs in which to allow execution (0-3, 0,1)")
		flCpusetMems        = cmd.String([]string{"-cpuset-mems"}, "", "MEMs in which to allow execution (0-3, 0,1)")
		flBlkioWeight       = cmd.Uint16([]string{"-blkio-weight"}, 0, "Block IO (relative weight), between 10 and 1000")
		flSwappiness        = cmd.Int64([]string{"-memory-swappiness"}, -1, "Tune container memory swappiness (0 to 100)")
		flNetMode           = cmd.String([]string{"-net"}, "default", "Connect a container to a network")
		flMacAddress        = cmd.String([]string{"-mac-address"}, "", "Container MAC address (e.g. 92:d0:c6:0a:29:33)")
		flIpcMode           = cmd.String([]string{"-ipc"}, "", "IPC namespace to use")
		flRestartPolicy     = cmd.String([]string{"-restart"}, "no", "Restart policy to apply when a container exits")
		flReadonlyRootfs    = cmd.Bool([]string{"-read-only"}, false, "Mount the container's root filesystem as read only")
		flLoggingDriver     = cmd.String([]string{"-log-driver"}, "", "Logging driver for container")
		flCgroupParent      = cmd.String([]string{"-cgroup-parent"}, "", "Optional parent cgroup for the container")
		flVolumeDriver      = cmd.String([]string{"-volume-driver"}, "", "Optional volume driver for the container")
		flStopSignal        = cmd.String([]string{"-stop-signal"}, signal.DefaultStopSignal, fmt.Sprintf("Signal to stop a container, %v by default", signal.DefaultStopSignal))
		flIsolation         = cmd.String([]string{"-isolation"}, "", "Container isolation level")
		flShmSize           = cmd.String([]string{"-shm-size"}, "", "Size of /dev/shm, default value is 64MB")
	)

	cmd.Var(&flAttach, []string{"a", "-attach"}, "Attach to STDIN, STDOUT or STDERR")
	cmd.Var(&flBlkioWeightDevice, []string{"-blkio-weight-device"}, "Block IO weight (relative device weight)")
	cmd.Var(&flDeviceReadBps, []string{"-device-read-bps"}, "Limit read rate (bytes per second) from a device")
	cmd.Var(&flDeviceWriteBps, []string{"-device-write-bps"}, "Limit write rate (bytes per second) to a device")
	cmd.Var(&flDeviceReadIOps, []string{"-device-read-iops"}, "Limit read rate (IO per second) from a device")
	cmd.Var(&flDeviceWriteIOps, []string{"-device-write-iops"}, "Limit write rate (IO per second) to a device")
	cmd.Var(&flVolumes, []string{"v", "-volume"}, "Bind mount a volume")
	cmd.Var(&flTmpfs, []string{"-tmpfs"}, "Mount a tmpfs directory")
	cmd.Var(&flLinks, []string{"-link"}, "Add link to another container")
	cmd.Var(&flDevices, []string{"-device"}, "Add a host device to the container")
	cmd.Var(&flLabels, []string{"l", "-label"}, "Set meta data on a container")
	cmd.Var(&flLabelsFile, []string{"-label-file"}, "Read in a line delimited file of labels")
	cmd.Var(&flEnv, []string{"e", "-env"}, "Set environment variables")
	cmd.Var(&flEnvFile, []string{"-env-file"}, "Read in a file of environment variables")
	cmd.Var(&flPublish, []string{"p", "-publish"}, "Publish a container's port(s) to the host")
	cmd.Var(&flExpose, []string{"-expose"}, "Expose a port or a range of ports")
	cmd.Var(&flDNS, []string{"-dns"}, "Set custom DNS servers")
	cmd.Var(&flDNSSearch, []string{"-dns-search"}, "Set custom DNS search domains")
	cmd.Var(&flDNSOptions, []string{"-dns-opt"}, "Set DNS options")
	cmd.Var(&flExtraHosts, []string{"-add-host"}, "Add a custom host-to-IP mapping (host:ip)")
	cmd.Var(&flVolumesFrom, []string{"-volumes-from"}, "Mount volumes from the specified container(s)")
	cmd.Var(&flCapAdd, []string{"-cap-add"}, "Add Linux capabilities")
	cmd.Var(&flCapDrop, []string{"-cap-drop"}, "Drop Linux capabilities")
	cmd.Var(&flGroupAdd, []string{"-group-add"}, "Add additional groups to join")
	cmd.Var(&flSecurityOpt, []string{"-security-opt"}, "Security Options")
	cmd.Var(flUlimits, []string{"-ulimit"}, "Ulimit options")
	cmd.Var(&flLoggingOpts, []string{"-log-opt"}, "Log driver options")

//.........这里部分代码省略.........

func TestCompare(t *testing.T) {
	ports1 := make(nat.PortSet)
	ports1[newPortNoError("tcp", "1111")] = struct{}{}
	ports1[newPortNoError("tcp", "2222")] = struct{}{}
	ports2 := make(nat.PortSet)
	ports2[newPortNoError("tcp", "3333")] = struct{}{}
	ports2[newPortNoError("tcp", "4444")] = struct{}{}
	ports3 := make(nat.PortSet)
	ports3[newPortNoError("tcp", "1111")] = struct{}{}
	ports3[newPortNoError("tcp", "2222")] = struct{}{}
	ports3[newPortNoError("tcp", "5555")] = struct{}{}
	volumes1 := make(map[string]struct{})
	volumes1["/test1"] = struct{}{}
	volumes2 := make(map[string]struct{})
	volumes2["/test2"] = struct{}{}
	volumes3 := make(map[string]struct{})
	volumes3["/test1"] = struct{}{}
	volumes3["/test3"] = struct{}{}
	envs1 := []string{"ENV1=value1", "ENV2=value2"}
	envs2 := []string{"ENV1=value1", "ENV3=value3"}
	entrypoint1 := strslice.New("/bin/sh", "-c")
	entrypoint2 := strslice.New("/bin/sh", "-d")
	entrypoint3 := strslice.New("/bin/sh", "-c", "echo")
	cmd1 := strslice.New("/bin/sh", "-c")
	cmd2 := strslice.New("/bin/sh", "-d")
	cmd3 := strslice.New("/bin/sh", "-c", "echo")
	labels1 := map[string]string{"LABEL1": "value1", "LABEL2": "value2"}
	labels2 := map[string]string{"LABEL1": "value1", "LABEL2": "value3"}
	labels3 := map[string]string{"LABEL1": "value1", "LABEL2": "value2", "LABEL3": "value3"}

	sameConfigs := map[*container.Config]*container.Config{
		// Empty config
		&container.Config{}: {},
		// Does not compare hostname, domainname & image
		&container.Config{
			Hostname:   "host1",
			Domainname: "domain1",
			Image:      "image1",
			User:       "user",
		}: {
			Hostname:   "host2",
			Domainname: "domain2",
			Image:      "image2",
			User:       "user",
		},
		// only OpenStdin
		&container.Config{OpenStdin: false}: {OpenStdin: false},
		// only env
		&container.Config{Env: envs1}: {Env: envs1},
		// only cmd
		&container.Config{Cmd: cmd1}: {Cmd: cmd1},
		// only labels
		&container.Config{Labels: labels1}: {Labels: labels1},
		// only exposedPorts
		&container.Config{ExposedPorts: ports1}: {ExposedPorts: ports1},
		// only entrypoints
		&container.Config{Entrypoint: entrypoint1}: {Entrypoint: entrypoint1},
		// only volumes
		&container.Config{Volumes: volumes1}: {Volumes: volumes1},
	}
	differentConfigs := map[*container.Config]*container.Config{
		nil: nil,
		&container.Config{
			Hostname:   "host1",
			Domainname: "domain1",
			Image:      "image1",
			User:       "user1",
		}: {
			Hostname:   "host1",
			Domainname: "domain1",
			Image:      "image1",
			User:       "user2",
		},
		// only OpenStdin
		&container.Config{OpenStdin: false}: {OpenStdin: true},
		&container.Config{OpenStdin: true}:  {OpenStdin: false},
		// only env
		&container.Config{Env: envs1}: {Env: envs2},
		// only cmd
		&container.Config{Cmd: cmd1}: {Cmd: cmd2},
		// not the same number of parts
		&container.Config{Cmd: cmd1}: {Cmd: cmd3},
		// only labels
		&container.Config{Labels: labels1}: {Labels: labels2},
		// not the same number of labels
		&container.Config{Labels: labels1}: {Labels: labels3},
		// only exposedPorts
		&container.Config{ExposedPorts: ports1}: {ExposedPorts: ports2},
		// not the same number of ports
		&container.Config{ExposedPorts: ports1}: {ExposedPorts: ports3},
		// only entrypoints
		&container.Config{Entrypoint: entrypoint1}: {Entrypoint: entrypoint2},
		// not the same number of parts
		&container.Config{Entrypoint: entrypoint1}: {Entrypoint: entrypoint3},
		// only volumes
		&container.Config{Volumes: volumes1}: {Volumes: volumes2},
		// not the same number of labels
		&container.Config{Volumes: volumes1}: {Volumes: volumes3},
	}
	for config1, config2 := range sameConfigs {
//.........这里部分代码省略.........

// RUN some command yo
//
// run a command and commit the image. Args are automatically prepended with
// 'sh -c' under linux or 'cmd /S /C' under Windows, in the event there is
// only one argument. The difference in processing:
//
// RUN echo hi          # sh -c echo hi       (Linux)
// RUN echo hi          # cmd /S /C echo hi   (Windows)
// RUN [ "echo", "hi" ] # echo hi
//
func run(b *Builder, args []string, attributes map[string]bool, original string) error {
	if b.image == "" && !b.noBaseImage {
		return derr.ErrorCodeMissingFrom
	}

	if err := b.flags.Parse(); err != nil {
		return err
	}

	args = handleJSONArgs(args, attributes)

	if !attributes["json"] {
		if runtime.GOOS != "windows" {
			args = append([]string{"/bin/sh", "-c"}, args...)
		} else {
			args = append([]string{"cmd", "/S", "/C"}, args...)
		}
	}

	config := &container.Config{
		Cmd:   strslice.New(args...),
		Image: b.image,
	}

	// stash the cmd
	cmd := b.runConfig.Cmd
	if b.runConfig.Entrypoint.Len() == 0 && b.runConfig.Cmd.Len() == 0 {
		b.runConfig.Cmd = config.Cmd
	}

	// stash the config environment
	env := b.runConfig.Env

	defer func(cmd *strslice.StrSlice) { b.runConfig.Cmd = cmd }(cmd)
	defer func(env []string) { b.runConfig.Env = env }(env)

	// derive the net build-time environment for this run. We let config
	// environment override the build time environment.
	// This means that we take the b.buildArgs list of env vars and remove
	// any of those variables that are defined as part of the container. In other
	// words, anything in b.Config.Env. What's left is the list of build-time env
	// vars that we need to add to each RUN command - note the list could be empty.
	//
	// We don't persist the build time environment with container's config
	// environment, but just sort and prepend it to the command string at time
	// of commit.
	// This helps with tracing back the image's actual environment at the time
	// of RUN, without leaking it to the final image. It also aids cache
	// lookup for same image built with same build time environment.
	cmdBuildEnv := []string{}
	configEnv := runconfigopts.ConvertKVStringsToMap(b.runConfig.Env)
	for key, val := range b.options.BuildArgs {
		if !b.isBuildArgAllowed(key) {
			// skip build-args that are not in allowed list, meaning they have
			// not been defined by an "ARG" Dockerfile command yet.
			// This is an error condition but only if there is no "ARG" in the entire
			// Dockerfile, so we'll generate any necessary errors after we parsed
			// the entire file (see 'leftoverArgs' processing in evaluator.go )
			continue
		}
		if _, ok := configEnv[key]; !ok {
			cmdBuildEnv = append(cmdBuildEnv, fmt.Sprintf("%s=%s", key, val))
		}
	}

	// derive the command to use for probeCache() and to commit in this container.
	// Note that we only do this if there are any build-time env vars.  Also, we
	// use the special argument "|#" at the start of the args array. This will
	// avoid conflicts with any RUN command since commands can not
	// start with | (vertical bar). The "#" (number of build envs) is there to
	// help ensure proper cache matches. We don't want a RUN command
	// that starts with "foo=abc" to be considered part of a build-time env var.
	saveCmd := config.Cmd
	if len(cmdBuildEnv) > 0 {
		sort.Strings(cmdBuildEnv)
		tmpEnv := append([]string{fmt.Sprintf("|%d", len(cmdBuildEnv))}, cmdBuildEnv...)
		saveCmd = strslice.New(append(tmpEnv, saveCmd.Slice()...)...)
	}

	b.runConfig.Cmd = saveCmd
	hit, err := b.probeCache()
	if err != nil {
		return err
	}
	if hit {
		return nil
	}

	// set Cmd manually, this is special case only for Dockerfiles
	b.runConfig.Cmd = config.Cmd
//.........这里部分代码省略.........