daemon/container_operations_unix.go - third_party/github.com/moby/moby - Git at Google

 // +build linux freebsd

 package daemon

 import (
 	"context"
 	"fmt"
 	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strconv"
 	"time"

 	"github.com/docker/docker/container"
 	"github.com/docker/docker/daemon/links"
 	"github.com/docker/docker/pkg/idtools"
 	"github.com/docker/docker/pkg/mount"
 	"github.com/docker/docker/pkg/stringid"
 	"github.com/docker/docker/runconfig"
 	"github.com/docker/libnetwork"
 	"github.com/opencontainers/selinux/go-selinux/label"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	"golang.org/x/sys/unix"
 )

 func (daemon *Daemon) setupLinkedContainers(container *container.Container) ([]string, error) {
 	var env []string
 	children := daemon.children(container)

 	bridgeSettings := container.NetworkSettings.Networks[runconfig.DefaultDaemonNetworkMode().NetworkName()]
 	if bridgeSettings == nil || bridgeSettings.EndpointSettings == nil {
 		return nil, nil
 	}

 	for linkAlias, child := range children {
 		if !child.IsRunning() {
 			return nil, fmt.Errorf("Cannot link to a non running container: %s AS %s", child.Name, linkAlias)
 		}

 		childBridgeSettings := child.NetworkSettings.Networks[runconfig.DefaultDaemonNetworkMode().NetworkName()]
 		if childBridgeSettings == nil || childBridgeSettings.EndpointSettings == nil {
 			return nil, fmt.Errorf("container %s not attached to default bridge network", child.ID)
 		}

 		link := links.NewLink(
 			bridgeSettings.IPAddress,
 			childBridgeSettings.IPAddress,
 			linkAlias,
 			child.Config.Env,
 			child.Config.ExposedPorts,
 		)

 		env = append(env, link.ToEnv()...)
 	}

 	return env, nil
 }

 func (daemon *Daemon) getIpcContainer(id string) (*container.Container, error) {
 	errMsg := "can't join IPC of container " + id
 	// Check the container exists
 	container, err := daemon.GetContainer(id)
 	if err != nil {
 		return nil, errors.Wrap(err, errMsg)
 	}
 	// Check the container is running and not restarting
 	if err := daemon.checkContainer(container, containerIsRunning, containerIsNotRestarting); err != nil {
 		return nil, errors.Wrap(err, errMsg)
 	}
 	// Check the container ipc is shareable
 	if st, err := os.Stat(container.ShmPath); err != nil || !st.IsDir() {
 		if err == nil || os.IsNotExist(err) {
 			return nil, errors.New(errMsg + ": non-shareable IPC")
 		}
 		// stat() failed?
 		return nil, errors.Wrap(err, errMsg+": unexpected error from stat "+container.ShmPath)
 	}

 	return container, nil
 }

 func (daemon *Daemon) getPidContainer(container *container.Container) (*container.Container, error) {
 	containerID := container.HostConfig.PidMode.Container()
 	container, err := daemon.GetContainer(containerID)
 	if err != nil {
 		return nil, errors.Wrapf(err, "cannot join PID of a non running container: %s", containerID)
 	}
 	return container, daemon.checkContainer(container, containerIsRunning, containerIsNotRestarting)
 }

 func containerIsRunning(c *container.Container) error {
 	if !c.IsRunning() {
 		return stateConflictError{errors.Errorf("container %s is not running", c.ID)}
 	}
 	return nil
 }

 func containerIsNotRestarting(c *container.Container) error {
 	if c.IsRestarting() {
 		return errContainerIsRestarting(c.ID)
 	}
 	return nil
 }

 func (daemon *Daemon) setupIpcDirs(c *container.Container) error {
 	ipcMode := c.HostConfig.IpcMode

 	switch {
 	case ipcMode.IsContainer():
 		ic, err := daemon.getIpcContainer(ipcMode.Container())
 		if err != nil {
 			return err
 		}
 		c.ShmPath = ic.ShmPath

 	case ipcMode.IsHost():
 		if _, err := os.Stat("/dev/shm"); err != nil {
 			return fmt.Errorf("/dev/shm is not mounted, but must be for --ipc=host")
 		}
 		c.ShmPath = "/dev/shm"

 	case ipcMode.IsPrivate(), ipcMode.IsNone():
 		// c.ShmPath will/should not be used, so make it empty.
 		// Container's /dev/shm mount comes from OCI spec.
 		c.ShmPath = ""

 	case ipcMode.IsEmpty():
 		// A container was created by an older version of the daemon.
 		// The default behavior used to be what is now called "shareable".
 		fallthrough

 	case ipcMode.IsShareable():
 		rootIDs := daemon.idMappings.RootPair()
 		if !c.HasMountFor("/dev/shm") {
 			shmPath, err := c.ShmResourcePath()
 			if err != nil {
 				return err
 			}

 			if err := idtools.MkdirAllAndChown(shmPath, 0700, rootIDs); err != nil {
 				return err
 			}

 			shmproperty := "mode=1777,size=" + strconv.FormatInt(c.HostConfig.ShmSize, 10)
 			if err := unix.Mount("shm", shmPath, "tmpfs", uintptr(unix.MS_NOEXEC|unix.MS_NOSUID|unix.MS_NODEV), label.FormatMountLabel(shmproperty, c.GetMountLabel())); err != nil {
 				return fmt.Errorf("mounting shm tmpfs: %s", err)
 			}
 			if err := os.Chown(shmPath, rootIDs.UID, rootIDs.GID); err != nil {
 				return err
 			}
 			c.ShmPath = shmPath
 		}

 	default:
 		return fmt.Errorf("invalid IPC mode: %v", ipcMode)
 	}

 	return nil
 }

 func (daemon *Daemon) setupSecretDir(c *container.Container) (setupErr error) {
 	if len(c.SecretReferences) == 0 {
 		return nil
 	}

 	localMountPath := c.SecretMountPath()
 	logrus.Debugf("secrets: setting up secret dir: %s", localMountPath)

 	// retrieve possible remapped range start for root UID, GID
 	rootIDs := daemon.idMappings.RootPair()
 	// create tmpfs
 	if err := idtools.MkdirAllAndChown(localMountPath, 0700, rootIDs); err != nil {
 		return errors.Wrap(err, "error creating secret local mount path")
 	}

 	defer func() {
 		if setupErr != nil {
 			// cleanup
 			_ = detachMounted(localMountPath)

 			if err := os.RemoveAll(localMountPath); err != nil {
 				logrus.Errorf("error cleaning up secret mount: %s", err)
 			}
 		}
 	}()

 	tmpfsOwnership := fmt.Sprintf("uid=%d,gid=%d", rootIDs.UID, rootIDs.GID)
 	if err := mount.Mount("tmpfs", localMountPath, "tmpfs", "nodev,nosuid,noexec,"+tmpfsOwnership); err != nil {
 		return errors.Wrap(err, "unable to setup secret mount")
 	}

 	if c.DependencyStore == nil {
 		return fmt.Errorf("secret store is not initialized")
 	}

 	for _, s := range c.SecretReferences {
 		// TODO (ehazlett): use type switch when more are supported
 		if s.File == nil {
 			logrus.Error("secret target type is not a file target")
 			continue
 		}

 		// secrets are created in the SecretMountPath on the host, at a
 		// single level
 		fPath := c.SecretFilePath(*s)
 		if err := idtools.MkdirAllAndChown(filepath.Dir(fPath), 0700, rootIDs); err != nil {
 			return errors.Wrap(err, "error creating secret mount path")
 		}

 		logrus.WithFields(logrus.Fields{
 			"name": s.File.Name,
 			"path": fPath,
 		}).Debug("injecting secret")
 		secret, err := c.DependencyStore.Secrets().Get(s.SecretID)
 		if err != nil {
 			return errors.Wrap(err, "unable to get secret from secret store")
 		}
 		if err := ioutil.WriteFile(fPath, secret.Spec.Data, s.File.Mode); err != nil {
 			return errors.Wrap(err, "error injecting secret")
 		}

 		uid, err := strconv.Atoi(s.File.UID)
 		if err != nil {
 			return err
 		}
 		gid, err := strconv.Atoi(s.File.GID)
 		if err != nil {
 			return err
 		}

 		if err := os.Chown(fPath, rootIDs.UID+uid, rootIDs.GID+gid); err != nil {
 			return errors.Wrap(err, "error setting ownership for secret")
 		}
 	}

 	label.Relabel(localMountPath, c.MountLabel, false)

 	// remount secrets ro
 	if err := mount.Mount("tmpfs", localMountPath, "tmpfs", "remount,ro,"+tmpfsOwnership); err != nil {
 		return errors.Wrap(err, "unable to remount secret dir as readonly")
 	}

 	return nil
 }

 func (daemon *Daemon) setupConfigDir(c *container.Container) (setupErr error) {
 	if len(c.ConfigReferences) == 0 {
 		return nil
 	}

 	localPath := c.ConfigsDirPath()
 	logrus.Debugf("configs: setting up config dir: %s", localPath)

 	// retrieve possible remapped range start for root UID, GID
 	rootIDs := daemon.idMappings.RootPair()
 	// create tmpfs
 	if err := idtools.MkdirAllAndChown(localPath, 0700, rootIDs); err != nil {
 		return errors.Wrap(err, "error creating config dir")
 	}

 	defer func() {
 		if setupErr != nil {
 			if err := os.RemoveAll(localPath); err != nil {
 				logrus.Errorf("error cleaning up config dir: %s", err)
 			}
 		}
 	}()

 	if c.DependencyStore == nil {
 		return fmt.Errorf("config store is not initialized")
 	}

 	for _, configRef := range c.ConfigReferences {
 		// TODO (ehazlett): use type switch when more are supported
 		if configRef.File == nil {
 			logrus.Error("config target type is not a file target")
 			continue
 		}

 		fPath := c.ConfigFilePath(*configRef)

 		log := logrus.WithFields(logrus.Fields{"name": configRef.File.Name, "path": fPath})

 		if err := idtools.MkdirAllAndChown(filepath.Dir(fPath), 0700, rootIDs); err != nil {
 			return errors.Wrap(err, "error creating config path")
 		}

 		log.Debug("injecting config")
 		config, err := c.DependencyStore.Configs().Get(configRef.ConfigID)
 		if err != nil {
 			return errors.Wrap(err, "unable to get config from config store")
 		}
 		if err := ioutil.WriteFile(fPath, config.Spec.Data, configRef.File.Mode); err != nil {
 			return errors.Wrap(err, "error injecting config")
 		}

 		uid, err := strconv.Atoi(configRef.File.UID)
 		if err != nil {
 			return err
 		}
 		gid, err := strconv.Atoi(configRef.File.GID)
 		if err != nil {
 			return err
 		}

 		if err := os.Chown(fPath, rootIDs.UID+uid, rootIDs.GID+gid); err != nil {
 			return errors.Wrap(err, "error setting ownership for config")
 		}

 		label.Relabel(fPath, c.MountLabel, false)
 	}

 	return nil
 }

 func killProcessDirectly(cntr *container.Container) error {
 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 	defer cancel()

 	// Block until the container to stops or timeout.
 	status := <-cntr.Wait(ctx, container.WaitConditionNotRunning)
 	if status.Err() != nil {
 		// Ensure that we don't kill ourselves
 		if pid := cntr.GetPID(); pid != 0 {
 			logrus.Infof("Container %s failed to exit within 10 seconds of kill - trying direct SIGKILL", stringid.TruncateID(cntr.ID))
 			if err := unix.Kill(pid, 9); err != nil {
 				if err != unix.ESRCH {
 					return err
 				}
 				e := errNoSuchProcess{pid, 9}
 				logrus.Debug(e)
 				return e
 			}
 		}
 	}
 	return nil
 }

 func detachMounted(path string) error {
 	return unix.Unmount(path, unix.MNT_DETACH)
 }

 func isLinkable(child *container.Container) bool {
 	// A container is linkable only if it belongs to the default network
 	_, ok := child.NetworkSettings.Networks[runconfig.DefaultDaemonNetworkMode().NetworkName()]
 	return ok
 }

 func enableIPOnPredefinedNetwork() bool {
 	return false
 }

 func (daemon *Daemon) isNetworkHotPluggable() bool {
 	return true
 }

 func setupPathsAndSandboxOptions(container *container.Container, sboxOptions *[]libnetwork.SandboxOption) error {
 	var err error

 	container.HostsPath, err = container.GetRootResourcePath("hosts")
 	if err != nil {
 		return err
 	}
 	*sboxOptions = append(*sboxOptions, libnetwork.OptionHostsPath(container.HostsPath))

 	container.ResolvConfPath, err = container.GetRootResourcePath("resolv.conf")
 	if err != nil {
 		return err
 	}
 	*sboxOptions = append(*sboxOptions, libnetwork.OptionResolvConfPath(container.ResolvConfPath))
 	return nil
 }

 func (daemon *Daemon) initializeNetworkingPaths(container *container.Container, nc *container.Container) error {
 	container.HostnamePath = nc.HostnamePath
 	container.HostsPath = nc.HostsPath
 	container.ResolvConfPath = nc.ResolvConfPath
 	return nil
 }
	// +build linux freebsd

	package daemon

	import (
	"context"
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"strconv"
	"time"

	"github.com/docker/docker/container"
	"github.com/docker/docker/daemon/links"
	"github.com/docker/docker/pkg/idtools"
	"github.com/docker/docker/pkg/mount"
	"github.com/docker/docker/pkg/stringid"
	"github.com/docker/docker/runconfig"
	"github.com/docker/libnetwork"
	"github.com/opencontainers/selinux/go-selinux/label"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
	"golang.org/x/sys/unix"
	)

	func (daemon Daemon) setupLinkedContainers(container container.Container) ([]string, error) {
	var env []string
	children := daemon.children(container)

	bridgeSettings := container.NetworkSettings.Networks[runconfig.DefaultDaemonNetworkMode().NetworkName()]
	if bridgeSettings == nil \|\| bridgeSettings.EndpointSettings == nil {
	return nil, nil
	}

	for linkAlias, child := range children {
	if !child.IsRunning() {
	return nil, fmt.Errorf("Cannot link to a non running container: %s AS %s", child.Name, linkAlias)
	}

	childBridgeSettings := child.NetworkSettings.Networks[runconfig.DefaultDaemonNetworkMode().NetworkName()]
	if childBridgeSettings == nil \|\| childBridgeSettings.EndpointSettings == nil {
	return nil, fmt.Errorf("container %s not attached to default bridge network", child.ID)
	}

	link := links.NewLink(
	bridgeSettings.IPAddress,
	childBridgeSettings.IPAddress,
	linkAlias,
	child.Config.Env,
	child.Config.ExposedPorts,
	)

	env = append(env, link.ToEnv()...)
	}

	return env, nil
	}

	func (daemon Daemon) getIpcContainer(id string) (container.Container, error) {
	errMsg := "can't join IPC of container " + id
	// Check the container exists
	container, err := daemon.GetContainer(id)
	if err != nil {
	return nil, errors.Wrap(err, errMsg)
	}
	// Check the container is running and not restarting
	if err := daemon.checkContainer(container, containerIsRunning, containerIsNotRestarting); err != nil {
	return nil, errors.Wrap(err, errMsg)
	}
	// Check the container ipc is shareable
	if st, err := os.Stat(container.ShmPath); err != nil \|\| !st.IsDir() {
	if err == nil \|\| os.IsNotExist(err) {
	return nil, errors.New(errMsg + ": non-shareable IPC")
	}
	// stat() failed?
	return nil, errors.Wrap(err, errMsg+": unexpected error from stat "+container.ShmPath)
	}

	return container, nil
	}

	func (daemon Daemon) getPidContainer(container container.Container) (*container.Container, error) {
	containerID := container.HostConfig.PidMode.Container()
	container, err := daemon.GetContainer(containerID)
	if err != nil {
	return nil, errors.Wrapf(err, "cannot join PID of a non running container: %s", containerID)
	}
	return container, daemon.checkContainer(container, containerIsRunning, containerIsNotRestarting)
	}

	func containerIsRunning(c *container.Container) error {
	if !c.IsRunning() {
	return stateConflictError{errors.Errorf("container %s is not running", c.ID)}
	}
	return nil
	}

	func containerIsNotRestarting(c *container.Container) error {
	if c.IsRestarting() {
	return errContainerIsRestarting(c.ID)
	}
	return nil
	}

	func (daemon Daemon) setupIpcDirs(c container.Container) error {
	ipcMode := c.HostConfig.IpcMode

	switch {
	case ipcMode.IsContainer():
	ic, err := daemon.getIpcContainer(ipcMode.Container())
	if err != nil {
	return err
	}
	c.ShmPath = ic.ShmPath

	case ipcMode.IsHost():
	if _, err := os.Stat("/dev/shm"); err != nil {
	return fmt.Errorf("/dev/shm is not mounted, but must be for --ipc=host")
	}
	c.ShmPath = "/dev/shm"

	case ipcMode.IsPrivate(), ipcMode.IsNone():
	// c.ShmPath will/should not be used, so make it empty.
	// Container's /dev/shm mount comes from OCI spec.
	c.ShmPath = ""

	case ipcMode.IsEmpty():
	// A container was created by an older version of the daemon.
	// The default behavior used to be what is now called "shareable".
	fallthrough

	case ipcMode.IsShareable():
	rootIDs := daemon.idMappings.RootPair()
	if !c.HasMountFor("/dev/shm") {
	shmPath, err := c.ShmResourcePath()
	if err != nil {
	return err
	}

	if err := idtools.MkdirAllAndChown(shmPath, 0700, rootIDs); err != nil {
	return err
	}

	shmproperty := "mode=1777,size=" + strconv.FormatInt(c.HostConfig.ShmSize, 10)
	if err := unix.Mount("shm", shmPath, "tmpfs", uintptr(unix.MS_NOEXEC\|unix.MS_NOSUID\|unix.MS_NODEV), label.FormatMountLabel(shmproperty, c.GetMountLabel())); err != nil {
	return fmt.Errorf("mounting shm tmpfs: %s", err)
	}
	if err := os.Chown(shmPath, rootIDs.UID, rootIDs.GID); err != nil {
	return err
	}
	c.ShmPath = shmPath
	}

	default:
	return fmt.Errorf("invalid IPC mode: %v", ipcMode)
	}

	return nil
	}

	func (daemon Daemon) setupSecretDir(c container.Container) (setupErr error) {
	if len(c.SecretReferences) == 0 {
	return nil
	}

	localMountPath := c.SecretMountPath()
	logrus.Debugf("secrets: setting up secret dir: %s", localMountPath)

	// retrieve possible remapped range start for root UID, GID
	rootIDs := daemon.idMappings.RootPair()
	// create tmpfs
	if err := idtools.MkdirAllAndChown(localMountPath, 0700, rootIDs); err != nil {
	return errors.Wrap(err, "error creating secret local mount path")
	}

	defer func() {
	if setupErr != nil {
	// cleanup
	_ = detachMounted(localMountPath)

	if err := os.RemoveAll(localMountPath); err != nil {
	logrus.Errorf("error cleaning up secret mount: %s", err)
	}
	}
	}()

	tmpfsOwnership := fmt.Sprintf("uid=%d,gid=%d", rootIDs.UID, rootIDs.GID)
	if err := mount.Mount("tmpfs", localMountPath, "tmpfs", "nodev,nosuid,noexec,"+tmpfsOwnership); err != nil {
	return errors.Wrap(err, "unable to setup secret mount")
	}

	if c.DependencyStore == nil {
	return fmt.Errorf("secret store is not initialized")
	}

	for _, s := range c.SecretReferences {
	// TODO (ehazlett): use type switch when more are supported
	if s.File == nil {
	logrus.Error("secret target type is not a file target")
	continue
	}

	// secrets are created in the SecretMountPath on the host, at a
	// single level
	fPath := c.SecretFilePath(*s)
	if err := idtools.MkdirAllAndChown(filepath.Dir(fPath), 0700, rootIDs); err != nil {
	return errors.Wrap(err, "error creating secret mount path")
	}

	logrus.WithFields(logrus.Fields{
	"name": s.File.Name,
	"path": fPath,
	}).Debug("injecting secret")
	secret, err := c.DependencyStore.Secrets().Get(s.SecretID)
	if err != nil {
	return errors.Wrap(err, "unable to get secret from secret store")
	}
	if err := ioutil.WriteFile(fPath, secret.Spec.Data, s.File.Mode); err != nil {
	return errors.Wrap(err, "error injecting secret")
	}

	uid, err := strconv.Atoi(s.File.UID)
	if err != nil {
	return err
	}
	gid, err := strconv.Atoi(s.File.GID)
	if err != nil {
	return err
	}

	if err := os.Chown(fPath, rootIDs.UID+uid, rootIDs.GID+gid); err != nil {
	return errors.Wrap(err, "error setting ownership for secret")
	}
	}

	label.Relabel(localMountPath, c.MountLabel, false)

	// remount secrets ro
	if err := mount.Mount("tmpfs", localMountPath, "tmpfs", "remount,ro,"+tmpfsOwnership); err != nil {
	return errors.Wrap(err, "unable to remount secret dir as readonly")
	}

	return nil
	}

	func (daemon Daemon) setupConfigDir(c container.Container) (setupErr error) {
	if len(c.ConfigReferences) == 0 {
	return nil
	}

	localPath := c.ConfigsDirPath()
	logrus.Debugf("configs: setting up config dir: %s", localPath)

	// retrieve possible remapped range start for root UID, GID
	rootIDs := daemon.idMappings.RootPair()
	// create tmpfs
	if err := idtools.MkdirAllAndChown(localPath, 0700, rootIDs); err != nil {
	return errors.Wrap(err, "error creating config dir")
	}

	defer func() {
	if setupErr != nil {
	if err := os.RemoveAll(localPath); err != nil {
	logrus.Errorf("error cleaning up config dir: %s", err)
	}
	}
	}()

	if c.DependencyStore == nil {
	return fmt.Errorf("config store is not initialized")
	}

	for _, configRef := range c.ConfigReferences {
	// TODO (ehazlett): use type switch when more are supported
	if configRef.File == nil {
	logrus.Error("config target type is not a file target")
	continue
	}

	fPath := c.ConfigFilePath(*configRef)

	log := logrus.WithFields(logrus.Fields{"name": configRef.File.Name, "path": fPath})

	if err := idtools.MkdirAllAndChown(filepath.Dir(fPath), 0700, rootIDs); err != nil {
	return errors.Wrap(err, "error creating config path")
	}

	log.Debug("injecting config")
	config, err := c.DependencyStore.Configs().Get(configRef.ConfigID)
	if err != nil {
	return errors.Wrap(err, "unable to get config from config store")
	}
	if err := ioutil.WriteFile(fPath, config.Spec.Data, configRef.File.Mode); err != nil {
	return errors.Wrap(err, "error injecting config")
	}

	uid, err := strconv.Atoi(configRef.File.UID)
	if err != nil {
	return err
	}
	gid, err := strconv.Atoi(configRef.File.GID)
	if err != nil {
	return err
	}

	if err := os.Chown(fPath, rootIDs.UID+uid, rootIDs.GID+gid); err != nil {
	return errors.Wrap(err, "error setting ownership for config")
	}

	label.Relabel(fPath, c.MountLabel, false)
	}

	return nil
	}

	func killProcessDirectly(cntr *container.Container) error {
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()

	// Block until the container to stops or timeout.
	status := <-cntr.Wait(ctx, container.WaitConditionNotRunning)
	if status.Err() != nil {
	// Ensure that we don't kill ourselves
	if pid := cntr.GetPID(); pid != 0 {
	logrus.Infof("Container %s failed to exit within 10 seconds of kill - trying direct SIGKILL", stringid.TruncateID(cntr.ID))
	if err := unix.Kill(pid, 9); err != nil {
	if err != unix.ESRCH {
	return err
	}
	e := errNoSuchProcess{pid, 9}
	logrus.Debug(e)
	return e
	}
	}
	}
	return nil
	}

	func detachMounted(path string) error {
	return unix.Unmount(path, unix.MNT_DETACH)
	}

	func isLinkable(child *container.Container) bool {
	// A container is linkable only if it belongs to the default network
	_, ok := child.NetworkSettings.Networks[runconfig.DefaultDaemonNetworkMode().NetworkName()]
	return ok
	}

	func enableIPOnPredefinedNetwork() bool {
	return false
	}

	func (daemon *Daemon) isNetworkHotPluggable() bool {
	return true
	}

	func setupPathsAndSandboxOptions(container container.Container, sboxOptions []libnetwork.SandboxOption) error {
	var err error

	container.HostsPath, err = container.GetRootResourcePath("hosts")
	if err != nil {
	return err
	}
	sboxOptions = append(sboxOptions, libnetwork.OptionHostsPath(container.HostsPath))

	container.ResolvConfPath, err = container.GetRootResourcePath("resolv.conf")
	if err != nil {
	return err
	}
	sboxOptions = append(sboxOptions, libnetwork.OptionResolvConfPath(container.ResolvConfPath))
	return nil
	}

	func (daemon Daemon) initializeNetworkingPaths(container container.Container, nc *container.Container) error {
	container.HostnamePath = nc.HostnamePath
	container.HostsPath = nc.HostsPath
	container.ResolvConfPath = nc.ResolvConfPath
	return nil
	}