Golang common.GetRktLockFD函数代码示例

func (b *Builder) Build() error {
	logs.WithF(b.fields).Info("Building aci")

	lfd, err := rktcommon.GetRktLockFD()
	if err != nil {
		return errs.WithEF(err, b.fields, "can't get rkt lock fd")
	}

	if err := sys.CloseOnExec(lfd, true); err != nil {
		return errs.WithEF(err, b.fields, "can't set FD_CLOEXEC on rkt lock")
	}

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

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

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

	return nil
}

func run() int {
	lfd, err := common.GetRktLockFD()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Failed to get rkt lock fd: %v\n", err)
		return 1
	}

	if err := sys.CloseOnExec(lfd, true); err != nil {
		fmt.Fprintf(os.Stderr, "Failed to set FD_CLOEXEC on rkt lock: %v\n", err)
		return 1
	}

	if err := stage1common.WritePpid(os.Getpid()); err != nil {
		fmt.Fprintf(os.Stderr, "write ppid: %v", err)
		return 1
	}
	fmt.Println("success, stub stage1 would at this point switch to stage2")
	return 0
}

func stage1() int {
	uuid, err := types.NewUUID(flag.Arg(0))
	if err != nil {
		log.PrintE("UUID is missing or malformed", err)
		return 1
	}

	root := "."
	p, err := stage1commontypes.LoadPod(root, uuid)
	if err != nil {
		log.PrintE("failed to load pod", err)
		return 1
	}

	// set close-on-exec flag on RKT_LOCK_FD so it gets correctly closed when invoking
	// network plugins
	lfd, err := common.GetRktLockFD()
	if err != nil {
		log.PrintE("failed to get rkt lock fd", err)
		return 1
	}

	if err := sys.CloseOnExec(lfd, true); err != nil {
		log.PrintE("failed to set FD_CLOEXEC on rkt lock", err)
		return 1
	}

	mirrorLocalZoneInfo(p.Root)

	flavor, _, err := stage1initcommon.GetFlavor(p)
	if err != nil {
		log.PrintE("failed to get stage1 flavor", err)
		return 3
	}

	var n *networking.Networking
	if netList.Contained() {
		fps, err := forwardedPorts(p)
		if err != nil {
			log.Error(err)
			return 6
		}

		n, err = networking.Setup(root, p.UUID, fps, netList, localConfig, flavor, debug)
		if err != nil {
			log.PrintE("failed to setup network", err)
			return 6
		}

		if err = n.Save(); err != nil {
			log.PrintE("failed to save networking state", err)
			n.Teardown(flavor, debug)
			return 6
		}

		if len(mdsToken) > 0 {
			hostIP, err := n.GetDefaultHostIP()
			if err != nil {
				log.PrintE("failed to get default Host IP", err)
				return 6
			}

			p.MetadataServiceURL = common.MetadataServicePublicURL(hostIP, mdsToken)
		}
	} else {
		if flavor == "kvm" {
			log.Print("flavor kvm requires private network configuration (try --net)")
			return 6
		}
		if len(mdsToken) > 0 {
			p.MetadataServiceURL = common.MetadataServicePublicURL(localhostIP, mdsToken)
		}
	}

	if err = stage1initcommon.WriteDefaultTarget(p); err != nil {
		log.PrintE("failed to write default.target", err)
		return 2
	}

	if err = stage1initcommon.WritePrepareAppTemplate(p); err != nil {
		log.PrintE("failed to write prepare-app service template", err)
		return 2
	}

	if err := stage1initcommon.SetJournalPermissions(p); err != nil {
		log.PrintE("warning: error setting journal ACLs, you'll need root to read the pod journal", err)
	}

	if flavor == "kvm" {
		if err := KvmPodToSystemd(p, n); err != nil {
			log.PrintE("failed to configure systemd for kvm", err)
			return 2
		}
	}

	if err = stage1initcommon.PodToSystemd(p, interactive, flavor, privateUsers); err != nil {
		log.PrintE("failed to configure systemd", err)
		return 2
	}

//.........这里部分代码省略.........

func stage1() int {
	uuid, err := types.NewUUID(flag.Arg(0))
	if err != nil {
		log.FatalE("UUID is missing or malformed", err)
	}

	root := "."
	p, err := stage1commontypes.LoadPod(root, uuid)
	if err != nil {
		log.FatalE("failed to load pod", err)
	}

	// set close-on-exec flag on RKT_LOCK_FD so it gets correctly closed when invoking
	// network plugins
	lfd, err := common.GetRktLockFD()
	if err != nil {
		log.FatalE("failed to get rkt lock fd", err)
	}

	if err := sys.CloseOnExec(lfd, true); err != nil {
		log.FatalE("failed to set FD_CLOEXEC on rkt lock", err)
	}

	mirrorLocalZoneInfo(p.Root)

	flavor, _, err := stage1initcommon.GetFlavor(p)
	if err != nil {
		log.FatalE("failed to get stage1 flavor", err)
	}

	var n *networking.Networking
	if netList.Contained() {
		fps, err := commonnet.ForwardedPorts(p.Manifest)
		if err != nil {
			log.FatalE("error initializing forwarding ports", err)
		}

		noDNS := dnsConfMode.Pairs["resolv"] != "default" // force ignore CNI DNS results
		n, err = networking.Setup(root, p.UUID, fps, netList, localConfig, flavor, noDNS, debug)
		if err != nil {
			log.FatalE("failed to setup network", err)
		}

		if err = n.Save(); err != nil {
			log.PrintE("failed to save networking state", err)
			n.Teardown(flavor, debug)
			return 254
		}

		if len(mdsToken) > 0 {
			hostIP, err := n.GetForwardableNetHostIP()
			if err != nil {
				log.FatalE("failed to get default Host IP", err)
			}

			p.MetadataServiceURL = common.MetadataServicePublicURL(hostIP, mdsToken)
		}
	} else {
		if flavor == "kvm" {
			log.Fatal("flavor kvm requires private network configuration (try --net)")
		}
		if len(mdsToken) > 0 {
			p.MetadataServiceURL = common.MetadataServicePublicURL(localhostIP, mdsToken)
		}
	}

	insecureOptions := stage1initcommon.Stage1InsecureOptions{
		DisablePaths:        disablePaths,
		DisableCapabilities: disableCapabilities,
		DisableSeccomp:      disableSeccomp,
	}

	mnt := fs.NewLoggingMounter(
		fs.MounterFunc(syscall.Mount),
		fs.UnmounterFunc(syscall.Unmount),
		diag.Printf,
	)

	if dnsConfMode.Pairs["resolv"] == "host" {
		stage1initcommon.UseHostResolv(mnt, root)
	}

	if dnsConfMode.Pairs["hosts"] == "host" {
		stage1initcommon.UseHostHosts(mnt, root)
	}

	if mutable {
		if err = stage1initcommon.MutableEnv(p); err != nil {
			log.FatalE("cannot initialize mutable environment", err)
		}
	} else {
		if err = stage1initcommon.ImmutableEnv(p, interactive, privateUsers, insecureOptions); err != nil {
			log.FatalE("cannot initialize immutable environment", err)
		}
	}

	if err := stage1initcommon.SetJournalPermissions(p); err != nil {
		log.PrintE("warning: error setting journal ACLs, you'll need root to read the pod journal", err)
	}

//.........这里部分代码省略.........

func stage1() int {
	uuid, err := types.NewUUID(flag.Arg(0))
	if err != nil {
		log.Print("UUID is missing or malformed\n")
		return 1
	}

	root := "."
	p, err := stage1commontypes.LoadPod(root, uuid)
	if err != nil {
		log.PrintE("can't load pod", err)
		return 1
	}

	// Sanity checks
	if len(p.Manifest.Apps) != 1 {
		log.Printf("flavor %q only supports 1 application per Pod for now", flavor)
		return 1
	}

	ra := p.Manifest.Apps[0]

	imgName := p.AppNameToImageName(ra.Name)
	args := ra.App.Exec
	if len(args) == 0 {
		log.Printf(`image %q has an empty "exec" (try --exec=BINARY)`, imgName)
		return 1
	}

	lfd, err := common.GetRktLockFD()
	if err != nil {
		log.PrintE("can't get rkt lock fd", err)
		return 1
	}

	// set close-on-exec flag on RKT_LOCK_FD so it gets correctly closed after execution is finished
	if err := sys.CloseOnExec(lfd, true); err != nil {
		log.PrintE("can't set FD_CLOEXEC on rkt lock", err)
		return 1
	}

	workDir := "/"
	if ra.App.WorkingDirectory != "" {
		workDir = ra.App.WorkingDirectory
	}

	env := []string{"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"}
	for _, e := range ra.App.Environment {
		env = append(env, e.Name+"="+e.Value)
	}

	rfs := filepath.Join(common.AppPath(p.Root, ra.Name), "rootfs")

	if err := copyResolv(p); err != nil {
		log.PrintE("can't copy /etc/resolv.conf", err)
		return 1
	}

	argFlyMounts, err := evaluateMounts(rfs, string(ra.Name), p)
	if err != nil {
		log.PrintE("can't evaluate mounts", err)
		return 1
	}

	effectiveMounts := append(
		[]flyMount{
			{"", "", "/dev", "none", syscall.MS_REC | syscall.MS_SHARED},
			{"/dev", rfs, "/dev", "none", syscall.MS_BIND | syscall.MS_REC},

			{"", "", "/proc", "none", syscall.MS_REC | syscall.MS_SHARED},
			{"/proc", rfs, "/proc", "none", syscall.MS_BIND | syscall.MS_REC},

			{"", "", "/sys", "none", syscall.MS_REC | syscall.MS_SHARED},
			{"/sys", rfs, "/sys", "none", syscall.MS_BIND | syscall.MS_REC},

			{"tmpfs", rfs, "/tmp", "tmpfs", 0},
		},
		argFlyMounts...,
	)

	for _, mount := range effectiveMounts {
		var (
			err            error
			hostPathInfo   os.FileInfo
			targetPathInfo os.FileInfo
		)

		if strings.HasPrefix(mount.HostPath, "/") {
			if hostPathInfo, err = os.Stat(mount.HostPath); err != nil {
				log.PrintE(fmt.Sprintf("stat of host path %s", mount.HostPath), err)
				return 1
			}
		} else {
			hostPathInfo = nil
		}

		absTargetPath := filepath.Join(mount.TargetPrefixPath, mount.RelTargetPath)
		if targetPathInfo, err = os.Stat(absTargetPath); err != nil && !os.IsNotExist(err) {
			log.PrintE(fmt.Sprintf("stat of target path %s", absTargetPath), err)
			return 1
//.........这里部分代码省略.........

func stage1() int {
	uuid, err := types.NewUUID(flag.Arg(0))
	if err != nil {
		fmt.Fprintln(os.Stderr, "UUID is missing or malformed")
		return 1
	}

	root := "."
	p, err := LoadPod(root, uuid)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Failed to load pod: %v\n", err)
		return 1
	}

	// set close-on-exec flag on RKT_LOCK_FD so it gets correctly closed when invoking
	// network plugins
	lfd, err := common.GetRktLockFD()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Failed to get rkt lock fd: %v\n", err)
		return 1
	}

	if err := sys.CloseOnExec(lfd, true); err != nil {
		fmt.Fprintf(os.Stderr, "Failed to set FD_CLOEXEC on rkt lock: %v\n", err)
		return 1
	}

	mirrorLocalZoneInfo(p.Root)

	flavor, _, err := p.getFlavor()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Failed to get stage1 flavor: %v\n", err)
		return 3
	}

	var n *networking.Networking
	if privNet.Any() {
		fps, err := forwardedPorts(p)
		if err != nil {
			fmt.Fprintln(os.Stderr, err.Error())
			return 6
		}

		n, err = networking.Setup(root, p.UUID, fps, privNet, localConfig, flavor)
		if err != nil {
			fmt.Fprintf(os.Stderr, "Failed to setup network: %v\n", err)
			return 6
		}

		if err = n.Save(); err != nil {
			fmt.Fprintf(os.Stderr, "Failed to save networking state %v\n", err)
			n.Teardown(flavor)
			return 6
		}

		if len(mdsToken) > 0 {
			hostIP, err := n.GetDefaultHostIP()
			if err != nil {
				fmt.Fprintf(os.Stderr, "Failed to get default Host IP: %v\n", err)
				return 6
			}

			p.MetadataServiceURL = common.MetadataServicePublicURL(hostIP, mdsToken)
		}
	} else {
		if flavor == "kvm" {
			fmt.Fprintf(os.Stderr, "Flavor kvm requires private network configuration (try --private-net).\n")
			return 6
		}
		if len(mdsToken) > 0 {
			p.MetadataServiceURL = common.MetadataServicePublicURL(localhostIP, mdsToken)
		}
	}

	if err = p.WritePrepareAppTemplate(); err != nil {
		fmt.Fprintf(os.Stderr, "Failed to write prepare-app service template: %v\n", err)
		return 2
	}

	if err = p.PodToSystemd(interactive, flavor); err != nil {
		fmt.Fprintf(os.Stderr, "Failed to configure systemd: %v\n", err)
		return 2
	}

	args, env, err := getArgsEnv(p, flavor, debug, n)
	if err != nil {
		fmt.Fprintf(os.Stderr, "%v\n", err)
		return 3
	}

	// create a separate mount namespace so the cgroup filesystems
	// are unmounted when exiting the pod
	if err := syscall.Unshare(syscall.CLONE_NEWNS); err != nil {
		log.Fatalf("error unsharing: %v", err)
	}

	// we recursively make / a "shared and slave" so mount events from the
	// new namespace don't propagate to the host namespace but mount events
	// from the host propagate to the new namespace and are forwarded to
	// its peer group
//.........这里部分代码省略.........

func stage1() int {
	uuid, err := types.NewUUID(flag.Arg(0))
	if err != nil {
		log.Print("UUID is missing or malformed\n")
		return 1
	}

	root := "."
	p, err := stage1commontypes.LoadPod(root, uuid)
	if err != nil {
		log.PrintE("can't load pod", err)
		return 1
	}

	if len(p.Manifest.Apps) != 1 {
		log.Printf("flavor %q only supports 1 application per Pod for now", flavor)
		return 1
	}

	lfd, err := common.GetRktLockFD()
	if err != nil {
		log.PrintE("can't get rkt lock fd", err)
		return 1
	}

	// set close-on-exec flag on RKT_LOCK_FD so it gets correctly closed after execution is finished
	if err := sys.CloseOnExec(lfd, true); err != nil {
		log.PrintE("can't set FD_CLOEXEC on rkt lock", err)
		return 1
	}

	env := []string{"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"}
	for _, e := range p.Manifest.Apps[0].App.Environment {
		env = append(env, e.Name+"="+e.Value)
	}

	args := p.Manifest.Apps[0].App.Exec
	rfs := filepath.Join(common.AppPath(p.Root, p.Manifest.Apps[0].Name), "rootfs")

	argFlyMounts, err := evaluateMounts(rfs, string(p.Manifest.Apps[0].Name), p)
	if err != nil {
		log.PrintE("can't evaluate mounts", err)
		return 1
	}

	effectiveMounts := append(
		[]flyMount{
			{"", "", "/dev", "none", syscall.MS_REC | syscall.MS_SHARED},
			{"/dev", rfs, "/dev", "none", syscall.MS_BIND | syscall.MS_REC},

			{"", "", "/proc", "none", syscall.MS_REC | syscall.MS_SHARED},
			{"/proc", rfs, "/proc", "none", syscall.MS_BIND | syscall.MS_REC},

			{"", "", "/sys", "none", syscall.MS_REC | syscall.MS_SHARED},
			{"/sys", rfs, "/sys", "none", syscall.MS_BIND | syscall.MS_REC},

			{"tmpfs", rfs, "/tmp", "tmpfs", 0},
		},
		argFlyMounts...,
	)

	for _, mount := range effectiveMounts {
		var (
			err            error
			hostPathInfo   os.FileInfo
			targetPathInfo os.FileInfo
		)

		if strings.HasPrefix(mount.HostPath, "/") {
			if hostPathInfo, err = os.Stat(mount.HostPath); err != nil {
				log.PrintE(fmt.Sprintf("stat of host directory %s", mount.HostPath), err)
				return 1
			}
		} else {
			hostPathInfo = nil
		}

		absTargetPath := filepath.Join(mount.TargetPrefixPath, mount.RelTargetPath)
		if targetPathInfo, err = os.Stat(absTargetPath); err != nil && !os.IsNotExist(err) {
			log.PrintE(fmt.Sprintf("stat of target directory %s", absTargetPath), err)
			return 1
		}

		switch {
		case targetPathInfo == nil:
			absTargetPathParent, _ := filepath.Split(absTargetPath)
			if err := os.MkdirAll(absTargetPathParent, 0700); err != nil {
				log.PrintE(fmt.Sprintf("can't create directory %q", absTargetPath), err)
				return 1
			}
			switch {
			case hostPathInfo == nil || hostPathInfo.IsDir():
				if err := os.Mkdir(absTargetPath, 0700); err != nil {
					log.PrintE(fmt.Sprintf("can't create directory %q", absTargetPath), err)
					return 1
				}
			case !hostPathInfo.IsDir():
				file, err := os.OpenFile(absTargetPath, os.O_CREATE, 0700)
				if err != nil {
					log.PrintE(fmt.Sprintf("can't create file %q", absTargetPath), err)
//.........这里部分代码省略.........

func stage1(rp *stage1commontypes.RuntimePod) int {
	uuid, err := types.NewUUID(flag.Arg(0))
	if err != nil {
		log.Print("UUID is missing or malformed\n")
		return 254
	}

	root := "."
	p, err := stage1commontypes.LoadPod(root, uuid, rp)
	if err != nil {
		log.PrintE("can't load pod", err)
		return 254
	}

	if err := p.SaveRuntime(); err != nil {
		log.FatalE("failed to save runtime parameters", err)
	}

	// Sanity checks
	if len(p.Manifest.Apps) != 1 {
		log.Printf("flavor %q only supports 1 application per Pod for now", flavor)
		return 254
	}

	ra := p.Manifest.Apps[0]

	imgName := p.AppNameToImageName(ra.Name)
	args := ra.App.Exec
	if len(args) == 0 {
		log.Printf(`image %q has an empty "exec" (try --exec=BINARY)`, imgName)
		return 254
	}

	lfd, err := common.GetRktLockFD()
	if err != nil {
		log.PrintE("can't get rkt lock fd", err)
		return 254
	}

	// set close-on-exec flag on RKT_LOCK_FD so it gets correctly closed after execution is finished
	if err := sys.CloseOnExec(lfd, true); err != nil {
		log.PrintE("can't set FD_CLOEXEC on rkt lock", err)
		return 254
	}

	workDir := "/"
	if ra.App.WorkingDirectory != "" {
		workDir = ra.App.WorkingDirectory
	}

	env := []string{"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"}
	for _, e := range ra.App.Environment {
		env = append(env, e.Name+"="+e.Value)
	}

	rfs := filepath.Join(common.AppPath(p.Root, ra.Name), "rootfs")

	argFlyMounts, err := evaluateMounts(rfs, string(ra.Name), p)
	if err != nil {
		log.PrintE("can't evaluate mounts", err)
		return 254
	}

	effectiveMounts := append(
		[]flyMount{
			{"", "", "/dev", "none", syscall.MS_REC | syscall.MS_SHARED},
			{"/dev", rfs, "/dev", "none", syscall.MS_BIND | syscall.MS_REC},

			{"", "", "/proc", "none", syscall.MS_REC | syscall.MS_SHARED},
			{"/proc", rfs, "/proc", "none", syscall.MS_BIND | syscall.MS_REC},

			{"", "", "/sys", "none", syscall.MS_REC | syscall.MS_SHARED},
			{"/sys", rfs, "/sys", "none", syscall.MS_BIND | syscall.MS_REC},

			{"tmpfs", rfs, "/tmp", "tmpfs", 0},
		},
		argFlyMounts...,
	)

	/* Process DNS config files
	 *
	 * /etc/resolv.conf: four modes
	 * 'host' - bind-mount host's file
	 * 'stage0' - bind-mount the file created by stage0
	 * 'default' - do nothing (we would respect CNI if fly had networking)
	 * 'none' - do nothing
	 */
	switch p.ResolvConfMode {
	case "host":
		effectiveMounts = append(effectiveMounts,
			flyMount{"/etc/resolv.conf", rfs, "/etc/resolv.conf", "none", syscall.MS_BIND | syscall.MS_RDONLY})
	case "stage0":
		if err := copyResolv(p); err != nil {
			log.PrintE("can't copy /etc/resolv.conf", err)
			return 254
		}
	}

	/*
	 * /etc/hosts: three modes:
//.........这里部分代码省略.........

func stage1() int {
	uuid, err := types.NewUUID(flag.Arg(0))
	if err != nil {
		fmt.Fprintln(os.Stderr, "UUID is missing or malformed")
		return 1
	}

	root := "."
	p, err := LoadPod(root, uuid)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Failed to load pod: %v\n", err)
		return 1
	}

	// set close-on-exec flag on RKT_LOCK_FD so it gets correctly closed when invoking
	// network plugins
	lfd, err := common.GetRktLockFD()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Failed to get rkt lock fd: %v\n", err)
		return 1
	}

	if err := sys.CloseOnExec(lfd, true); err != nil {
		fmt.Fprintf(os.Stderr, "Failed to set FD_CLOEXEC on rkt lock: %v\n", err)
		return 1
	}

	mirrorLocalZoneInfo(p.Root)

	if privNet {
		fps, err := forwardedPorts(p)
		if err != nil {
			fmt.Fprintln(os.Stderr, err.Error())
			return 6
		}

		n, err := networking.Setup(root, p.UUID, fps)
		if err != nil {
			fmt.Fprintf(os.Stderr, "Failed to setup network: %v\n", err)
			return 6
		}
		defer n.Teardown()

		if err = n.Save(); err != nil {
			fmt.Fprintf(os.Stderr, "Failed to save networking state %v\n", err)
			return 6
		}

		p.MetadataServiceURL = common.MetadataServicePublicURL(n.GetDefaultHostIP())

		if err = registerPod(p, n.GetDefaultIP()); err != nil {
			fmt.Fprintf(os.Stderr, "Failed to register pod: %v\n", err)
			return 6
		}
		defer unregisterPod(p)
	}

	if err = p.PodToSystemd(interactive); err != nil {
		fmt.Fprintf(os.Stderr, "Failed to configure systemd: %v\n", err)
		return 2
	}

	args, env, err := getArgsEnv(p, debug)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Failed to get execution parameters: %v\n", err)
		return 3
	}

	var execFn func() error

	if privNet {
		cmd := exec.Cmd{
			Path:   args[0],
			Args:   args,
			Stdin:  os.Stdin,
			Stdout: os.Stdout,
			Stderr: os.Stderr,
			Env:    env,
		}
		execFn = cmd.Run
	} else {
		execFn = func() error {
			return syscall.Exec(args[0], args, env)
		}
	}

	err = withClearedCloExec(lfd, execFn)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Failed to execute nspawn: %v\n", err)
		return 5
	}

	return 0
}

// getArgsEnv returns the nspawn args and env according to the usr used
func getArgsEnv(p *Pod, debug bool) ([]string, []string, error) {
	args := []string{}
	env := os.Environ()

	flavor, err := os.Readlink(filepath.Join(common.Stage1RootfsPath(p.Root), "flavor"))
	if err != nil {
		return nil, nil, fmt.Errorf("unable to determine stage1 flavor: %v", err)
	}

	switch flavor {
	case "coreos":
		// when running the coreos-derived stage1 with unpatched systemd-nspawn we need some ld-linux hackery
		args = append(args, filepath.Join(common.Stage1RootfsPath(p.Root), interpBin))
		args = append(args, filepath.Join(common.Stage1RootfsPath(p.Root), nspawnBin))
		args = append(args, "--boot") // Launch systemd in the pod

		// Note: the coreos flavor uses systemd-nspawn v215 but machinedRegister()
		// checks for the nspawn registration method used since v216. So we will
		// not register when the host has systemd v215.
		if machinedRegister() {
			args = append(args, fmt.Sprintf("--register=true"))
		} else {
			args = append(args, fmt.Sprintf("--register=false"))
		}

		env = append(env, "LD_PRELOAD="+filepath.Join(common.Stage1RootfsPath(p.Root), "fakesdboot.so"))
		env = append(env, "LD_LIBRARY_PATH="+filepath.Join(common.Stage1RootfsPath(p.Root), "usr/lib"))

	case "src":
		args = append(args, filepath.Join(common.Stage1RootfsPath(p.Root), nspawnBin))
		args = append(args, "--boot") // Launch systemd in the pod
		out, err := os.Getwd()
		if err != nil {
			return nil, nil, err
		}
		lfd, err := common.GetRktLockFD()
		if err != nil {
			return nil, nil, err
		}
		args = append(args, fmt.Sprintf("--pid-file=%v", filepath.Join(out, "pid")))
		args = append(args, fmt.Sprintf("--keep-fd=%v", lfd))
		if machinedRegister() {
			args = append(args, fmt.Sprintf("--register=true"))
		} else {
			args = append(args, fmt.Sprintf("--register=false"))
		}
	default:
		return nil, nil, fmt.Errorf("unrecognized stage1 flavor: %q", flavor)
	}

	if !debug {
		args = append(args, "--quiet") // silence most nspawn output (log_warning is currently not covered by this)
	}

	nsargs, err := p.PodToNspawnArgs()
	if err != nil {
		return nil, nil, fmt.Errorf("Failed to generate nspawn args: %v", err)
	}
	args = append(args, nsargs...)

	// Arguments to systemd
	args = append(args, "--")
	args = append(args, "--default-standard-output=tty") // redirect all service logs straight to tty
	if !debug {
		args = append(args, "--log-target=null") // silence systemd output inside pod
		args = append(args, "--show-status=0")   // silence systemd initialization status output
	}

	return args, env, nil
}

// getArgsEnv returns the nspawn args and env according to the usr used
func getArgsEnv(p *Pod, flavor string, systemdStage1Version string, debug bool) ([]string, []string, error) {
	args := []string{}
	env := os.Environ()

	switch flavor {
	case "coreos":
		args = append(args, filepath.Join(common.Stage1RootfsPath(p.Root), interpBin))
		args = append(args, filepath.Join(common.Stage1RootfsPath(p.Root), nspawnBin))
		args = append(args, "--boot") // Launch systemd in the pod

		if machinedRegister() {
			args = append(args, fmt.Sprintf("--register=true"))
		} else {
			args = append(args, fmt.Sprintf("--register=false"))
		}

		// use only dynamic libraries provided in the image
		env = append(env, "LD_LIBRARY_PATH="+filepath.Join(common.Stage1RootfsPath(p.Root), "usr/lib"))

	case "src":
		args = append(args, filepath.Join(common.Stage1RootfsPath(p.Root), nspawnBin))
		args = append(args, "--boot") // Launch systemd in the pod

		switch systemdStage1Version {
		case "v215":
			lfd, err := common.GetRktLockFD()
			if err != nil {
				return nil, nil, err
			}
			args = append(args, fmt.Sprintf("--keep-fd=%v", lfd))
		case "v219":
			// --keep-fd is not needed thanks to
			// stage1/rootfs/usr_from_src/patches/v219/0005-nspawn-close-extra-fds-before-execing-init.patch
		default:
			// since systemd-nspawn v220 (commit 6b7d2e, "nspawn: close extra fds
			// before execing init"), fds remain open, so --keep-fd is not needed.
		}

		if machinedRegister() {
			args = append(args, fmt.Sprintf("--register=true"))
		} else {
			args = append(args, fmt.Sprintf("--register=false"))
		}

	case "host":
		hostNspawnBin, err := lookupPath("systemd-nspawn", os.Getenv("PATH"))
		if err != nil {
			return nil, nil, err
		}

		// Check dynamically which version is installed on the host
		// Support version >= 220
		versionBytes, err := exec.Command(hostNspawnBin, "--version").CombinedOutput()
		if err != nil {
			return nil, nil, fmt.Errorf("unable to probe %s version: %v", hostNspawnBin, err)
		}
		versionStr := strings.SplitN(string(versionBytes), "\n", 2)[0]
		var version int
		n, err := fmt.Sscanf(versionStr, "systemd %d", &version)
		if err != nil {
			return nil, nil, fmt.Errorf("cannot parse version: %q", versionStr)
		}
		if n != 1 || version < 220 {
			return nil, nil, fmt.Errorf("rkt needs systemd-nspawn >= 220. %s version not supported: %v", hostNspawnBin, versionStr)
		}

		// Copy systemd, bash, etc. in stage1 at run-time
		if err := installAssets(); err != nil {
			return nil, nil, fmt.Errorf("cannot install assets from the host: %v", err)
		}

		args = append(args, hostNspawnBin)
		args = append(args, "--boot") // Launch systemd in the pod
		args = append(args, fmt.Sprintf("--register=true"))

	default:
		return nil, nil, fmt.Errorf("unrecognized stage1 flavor: %q", flavor)
	}

	// link journal only if the host is running systemd and stage1 supports
	// linking
	if util.IsRunningSystemd() && systemdSupportsJournalLinking(systemdStage1Version) {
		// we write /etc/machine-id here because systemd-nspawn needs it to link
		// the container's journal to the host
		mPath := filepath.Join(common.Stage1RootfsPath(p.Root), "etc", "machine-id")
		mId := strings.Replace(p.UUID.String(), "-", "", -1)

		if err := ioutil.WriteFile(mPath, []byte(mId), 0644); err != nil {
			log.Fatalf("error writing /etc/machine-id: %v\n", err)
		}

		args = append(args, "--link-journal=try-guest")
	}

	if !debug {
		args = append(args, "--quiet")             // silence most nspawn output (log_warning is currently not covered by this)
		env = append(env, "SYSTEMD_LOG_LEVEL=err") // silence log_warning too
	}

//.........这里部分代码省略.........

func stage1() int {
	uuid, err := types.NewUUID(flag.Arg(0))
	if err != nil {
		fmt.Fprintln(os.Stderr, "UUID is missing or malformed")
		return 1
	}

	root := "."
	p, err := LoadPod(root, uuid)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Failed to load pod: %v\n", err)
		return 1
	}

	// set close-on-exec flag on RKT_LOCK_FD so it gets correctly closed when invoking
	// network plugins
	lfd, err := common.GetRktLockFD()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Failed to get rkt lock fd: %v\n", err)
		return 1
	}

	if err := sys.CloseOnExec(lfd, true); err != nil {
		fmt.Fprintf(os.Stderr, "Failed to set FD_CLOEXEC on rkt lock: %v\n", err)
		return 1
	}

	mirrorLocalZoneInfo(p.Root)

	if privNet.Any() {
		fps, err := forwardedPorts(p)
		if err != nil {
			fmt.Fprintln(os.Stderr, err.Error())
			return 6
		}

		n, err := networking.Setup(root, p.UUID, fps, privNet)
		if err != nil {
			fmt.Fprintf(os.Stderr, "Failed to setup network: %v\n", err)
			return 6
		}
		defer n.Teardown()

		if err = n.Save(); err != nil {
			fmt.Fprintf(os.Stderr, "Failed to save networking state %v\n", err)
			return 6
		}

		hostIP, err := n.GetDefaultHostIP()
		if err != nil {
			fmt.Fprintf(os.Stderr, "Failed to get default Host IP: %v\n", err)
			return 6
		}

		mdsToken, err := generateMDSToken()
		if err != nil {
			fmt.Fprintf(os.Stderr, "Failed to generate MDS token: %v", err)
			return 8
		}

		p.MetadataServiceURL = common.MetadataServicePublicURL(hostIP, mdsToken)

		if err = registerPod(p, mdsToken); err != nil {
			fmt.Fprintf(os.Stderr, "Failed to register pod: %v\n", err)
			return 8
		}

		defer unregisterPod(p)
	}

	flavor, systemdStage1Version, err := p.getFlavor()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Failed to get stage1 flavor: %v\n", err)
		return 3
	}

	if err = p.WritePrepareAppTemplate(systemdStage1Version); err != nil {
		fmt.Fprintf(os.Stderr, "Failed to write prepare-app service template: %v\n", err)
		return 2
	}

	if err = p.PodToSystemd(interactive); err != nil {
		fmt.Fprintf(os.Stderr, "Failed to configure systemd: %v\n", err)
		return 2
	}

	args, env, err := getArgsEnv(p, flavor, systemdStage1Version, debug)
	if err != nil {
		fmt.Fprintf(os.Stderr, "%v\n", err)
		return 3
	}

	appHashes := p.GetAppHashes()
	s1Root := common.Stage1RootfsPath(p.Root)
	machineID := p.GetMachineID()
	subcgroup, err := getContainerSubCgroup(machineID)
	if err == nil {
		if err := cgroup.CreateCgroups(s1Root, subcgroup, appHashes); err != nil {
			fmt.Fprintf(os.Stderr, "Error creating cgroups: %v\n", err)
			return 5
//.........这里部分代码省略.........