Golang FlagSet.Parse方法代碼示例

func parseRun(cmd *flag.FlagSet, args []string, sysInfo *sysinfo.SysInfo) (*Config, *HostConfig, *flag.FlagSet, error) {
	var (
		// FIXME: use utils.ListOpts for attach and volumes?
		flAttach  = opts.NewListOpts(opts.ValidateAttach)
		flVolumes = opts.NewListOpts(opts.ValidatePath)
		flLinks   = opts.NewListOpts(opts.ValidateLink)
		flEnv     = opts.NewListOpts(opts.ValidateEnv)

		flPublish     opts.ListOpts
		flExpose      opts.ListOpts
		flDns         = opts.NewListOpts(opts.ValidateIPAddress)
		flDnsSearch   = opts.NewListOpts(opts.ValidateDnsSearch)
		flVolumesFrom opts.ListOpts
		flLxcOpts     opts.ListOpts
		flEnvFile     opts.ListOpts

		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 container in the background and print new container ID")
		flNetwork         = cmd.Bool([]string{"#n", "#-networking"}, true, "Enable networking for this container")
		flPrivileged      = cmd.Bool([]string{"#privileged", "-privileged"}, false, "Give extended privileges to this container")
		flPublishAll      = cmd.Bool([]string{"P", "-publish-all"}, false, "Publish all exposed ports to the host interfaces")
		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")
		flContainerIDFile = cmd.String([]string{"#cidfile", "-cidfile"}, "", "Write the container ID to the file")
		flEntrypoint      = cmd.String([]string{"#entrypoint", "-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 (format: <number><optional unit>, where unit = b, k, m or g)")
		flUser            = cmd.String([]string{"u", "-user"}, "", "Username or UID")
		flWorkingDir      = cmd.String([]string{"w", "-workdir"}, "", "Working directory inside the container")
		flCpuShares       = cmd.Int64([]string{"c", "-cpu-shares"}, 0, "CPU shares (relative weight)")
		flCpuset          = cmd.String([]string{"-cpuset"}, "", "CPUs in which to allow execution (0-3, 0,1)")
		flNetMode         = cmd.String([]string{"-net"}, "bridge", "Set the Network mode for the container\n'bridge': creates a new network stack for the container on the docker bridge\n'none': no networking for this container\n'container:<name|id>': reuses another container network stack\n'host': use the host network stack inside the container.  Note: the host mode gives the container full access to local system services such as D-bus and is therefore considered insecure.")
		// For documentation purpose
		_ = cmd.Bool([]string{"#sig-proxy", "-sig-proxy"}, true, "Proxify received signals to the process (even in non-TTY mode). SIGCHLD is not proxied.")
		_ = cmd.String([]string{"#name", "-name"}, "", "Assign a name to the container")
	)

	cmd.Var(&flAttach, []string{"a", "-attach"}, "Attach to STDIN, STDOUT or STDERR.")
	cmd.Var(&flVolumes, []string{"v", "-volume"}, "Bind mount a volume (e.g., from the host: -v /host:/container, from Docker: -v /container)")
	cmd.Var(&flLinks, []string{"#link", "-link"}, "Add link to another container in the form of name:alias")
	cmd.Var(&flEnv, []string{"e", "-env"}, "Set environment variables")
	cmd.Var(&flEnvFile, []string{"-env-file"}, "Read in a line delimited file of environment variables")

	cmd.Var(&flPublish, []string{"p", "-publish"}, fmt.Sprintf("Publish a container's port to the host\nformat: %s\n(use 'docker port' to see the actual mapping)", nat.PortSpecTemplateFormat))
	cmd.Var(&flExpose, []string{"#expose", "-expose"}, "Expose a port from the container without publishing it to your host")
	cmd.Var(&flDns, []string{"#dns", "-dns"}, "Set custom DNS servers")
	cmd.Var(&flDnsSearch, []string{"-dns-search"}, "Set custom DNS search domains")
	cmd.Var(&flVolumesFrom, []string{"#volumes-from", "-volumes-from"}, "Mount volumes from the specified container(s)")
	cmd.Var(&flLxcOpts, []string{"#lxc-conf", "-lxc-conf"}, "(lxc exec-driver only) Add custom lxc options --lxc-conf=\"lxc.cgroup.cpuset.cpus = 0,1\"")

	if err := cmd.Parse(args); err != nil {
		return nil, nil, cmd, err
	}

	// Check if the kernel supports memory limit cgroup.
	if sysInfo != nil && *flMemoryString != "" && !sysInfo.MemoryLimit {
		*flMemoryString = ""
	}

	// Validate input params
	if *flDetach && flAttach.Len() > 0 {
		return nil, nil, cmd, ErrConflictAttachDetach
	}
	if *flWorkingDir != "" && !path.IsAbs(*flWorkingDir) {
		return nil, nil, cmd, ErrInvalidWorkingDirectory
	}
	if *flDetach && *flAutoRemove {
		return nil, nil, cmd, ErrConflictDetachAutoRemove
	}

	if *flNetMode != "bridge" && *flNetMode != "none" && *flHostname != "" {
		return nil, nil, cmd, ErrConflictNetworkHostname
	}

	// If neither -d or -a are set, attach to everything by default
	if flAttach.Len() == 0 && !*flDetach {
		if !*flDetach {
			flAttach.Set("stdout")
			flAttach.Set("stderr")
			if *flStdin {
				flAttach.Set("stdin")
			}
		}
	}

	var flMemory int64
	if *flMemoryString != "" {
		parsedMemory, err := units.RAMInBytes(*flMemoryString)
		if err != nil {
			return nil, nil, cmd, err
		}
		flMemory = parsedMemory
	}

	var binds []string
	// add any bind targets to the list of container volumes
	for bind := range flVolumes.GetMap() {
		if arr := strings.Split(bind, ":"); len(arr) > 1 {
			if arr[1] == "/" {
				return nil, nil, cmd, fmt.Errorf("Invalid bind mount: destination can't be '/'")
//.........這裏部分代碼省略.........

func parseRun(cmd *flag.FlagSet, args []string, sysInfo *sysinfo.SysInfo) (*Config, *HostConfig, *flag.FlagSet, error) {
	var (
		// FIXME: use utils.ListOpts for attach and volumes?
		flAttach  = opts.NewListOpts(opts.ValidateAttach)
		flVolumes = opts.NewListOpts(opts.ValidatePath)
		flLinks   = opts.NewListOpts(opts.ValidateLink)
		flEnv     = opts.NewListOpts(opts.ValidateEnv)

		flPublish     opts.ListOpts
		flExpose      opts.ListOpts
		flDns         opts.ListOpts
		flVolumesFrom opts.ListOpts
		flLxcOpts     opts.ListOpts

		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 container in the background, print new container id")
		flNetwork         = cmd.Bool([]string{"n", "-networking"}, true, "Enable networking for this container")
		flPrivileged      = cmd.Bool([]string{"#privileged", "-privileged"}, false, "Give extended privileges to this container")
		flPublishAll      = cmd.Bool([]string{"P", "-publish-all"}, false, "Publish all exposed ports to the host interfaces")
		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")
		flContainerIDFile = cmd.String([]string{"#cidfile", "-cidfile"}, "", "Write the container ID to the file")
		flEntrypoint      = cmd.String([]string{"#entrypoint", "-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 (format: <number><optional unit>, where unit = b, k, m or g)")
		flUser            = cmd.String([]string{"u", "-user"}, "", "Username or UID")
		flWorkingDir      = cmd.String([]string{"w", "-workdir"}, "", "Working directory inside the container")
		flCpuShares       = cmd.Int64([]string{"c", "-cpu-shares"}, 0, "CPU shares (relative weight)")

		// For documentation purpose
		_ = cmd.Bool([]string{"#sig-proxy", "-sig-proxy"}, true, "Proxify all received signal to the process (even in non-tty mode)")
		_ = cmd.String([]string{"#name", "-name"}, "", "Assign a name to the container")
	)

	cmd.Var(&flAttach, []string{"a", "-attach"}, "Attach to stdin, stdout or stderr.")
	cmd.Var(&flVolumes, []string{"v", "-volume"}, "Bind mount a volume (e.g. from the host: -v /host:/container, from docker: -v /container)")
	cmd.Var(&flLinks, []string{"#link", "-link"}, "Add link to another container (name:alias)")
	cmd.Var(&flEnv, []string{"e", "-env"}, "Set environment variables")

	cmd.Var(&flPublish, []string{"p", "-publish"}, fmt.Sprintf("Publish a container's port to the host (format: %s) (use 'docker port' to see the actual mapping)", nat.PortSpecTemplateFormat))
	cmd.Var(&flExpose, []string{"#expose", "-expose"}, "Expose a port from the container without publishing it to your host")
	cmd.Var(&flDns, []string{"#dns", "-dns"}, "Set custom dns servers")
	cmd.Var(&flVolumesFrom, []string{"#volumes-from", "-volumes-from"}, "Mount volumes from the specified container(s)")
	cmd.Var(&flLxcOpts, []string{"#lxc-conf", "-lxc-conf"}, "Add custom lxc options -lxc-conf=\"lxc.cgroup.cpuset.cpus = 0,1\"")

	if err := cmd.Parse(args); err != nil {
		return nil, nil, cmd, err
	}

	// Check if the kernel supports memory limit cgroup.
	if sysInfo != nil && *flMemoryString != "" && !sysInfo.MemoryLimit {
		*flMemoryString = ""
	}

	// Validate input params
	if *flDetach && flAttach.Len() > 0 {
		return nil, nil, cmd, ErrConflictAttachDetach
	}
	if *flWorkingDir != "" && !path.IsAbs(*flWorkingDir) {
		return nil, nil, cmd, ErrInvalidWorikingDirectory
	}
	if *flDetach && *flAutoRemove {
		return nil, nil, cmd, ErrConflictDetachAutoRemove
	}

	// If neither -d or -a are set, attach to everything by default
	if flAttach.Len() == 0 && !*flDetach {
		if !*flDetach {
			flAttach.Set("stdout")
			flAttach.Set("stderr")
			if *flStdin {
				flAttach.Set("stdin")
			}
		}
	}

	var flMemory int64
	if *flMemoryString != "" {
		parsedMemory, err := utils.RAMInBytes(*flMemoryString)
		if err != nil {
			return nil, nil, cmd, err
		}
		flMemory = parsedMemory
	}

	var binds []string
	// add any bind targets to the list of container volumes
	for bind := range flVolumes.GetMap() {
		if arr := strings.Split(bind, ":"); len(arr) > 1 {
			if arr[0] == "/" {
				return nil, nil, cmd, fmt.Errorf("Invalid bind mount: source can't be '/'")
			}
			dstDir := arr[1]
			flVolumes.Set(dstDir)
			binds = append(binds, bind)
			flVolumes.Delete(bind)
		} else if bind == "/" {
			return nil, nil, cmd, fmt.Errorf("Invalid volume: path can't be '/'")
		}
	}
//.........這裏部分代碼省略.........