// +build linux freebsd solaris

 
 package container
 
 import (
 	"fmt"
 	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
 

 	"github.com/docker/docker/api/types"

 	containertypes "github.com/docker/docker/api/types/container"

 	mounttypes "github.com/docker/docker/api/types/mount"

 	"github.com/docker/docker/pkg/chrootarchive"

 	"github.com/docker/docker/pkg/mount"

 	"github.com/docker/docker/pkg/stringid"

 	"github.com/docker/docker/pkg/symlink"
 	"github.com/docker/docker/pkg/system"
 	"github.com/docker/docker/volume"

 	"github.com/opencontainers/selinux/go-selinux/label"

 	"github.com/sirupsen/logrus"

 	"golang.org/x/sys/unix"

 )
 

 const (

 	containerSecretMountPath = "/run/secrets"

 )

 // ExitStatus provides exit reasons for a container.
 type ExitStatus struct {
 	// The exit code with which the container exited.
 	ExitCode int
 
 	// Whether the container encountered an OOM.
 	OOMKilled bool
 }
 

 // TrySetNetworkMount attempts to set the network mounts given a provided destination and
 // the path to use for it; return true if the given destination was a network mount file
 func (container *Container) TrySetNetworkMount(destination string, path string) bool {
 	if destination == "/etc/resolv.conf" {
 		container.ResolvConfPath = path
 		return true
 	}
 	if destination == "/etc/hostname" {
 		container.HostnamePath = path
 		return true
 	}
 	if destination == "/etc/hosts" {
 		container.HostsPath = path
 		return true
 	}
 
 	return false
 }
 
 // BuildHostnameFile writes the container's hostname file.
 func (container *Container) BuildHostnameFile() error {
 	hostnamePath, err := container.GetRootResourcePath("hostname")
 	if err != nil {
 		return err
 	}
 	container.HostnamePath = hostnamePath
 	return ioutil.WriteFile(container.HostnamePath, []byte(container.Config.Hostname+"\n"), 0644)
 }
 
 // NetworkMounts returns the list of network mounts.

 func (container *Container) NetworkMounts() []Mount {
 	var mounts []Mount

 	shared := container.HostConfig.NetworkMode.IsContainer()
 	if container.ResolvConfPath != "" {
 		if _, err := os.Stat(container.ResolvConfPath); err != nil {
 			logrus.Warnf("ResolvConfPath set to %q, but can't stat this filename (err = %v); skipping", container.ResolvConfPath, err)
 		} else {

 			if !container.HasMountFor("/etc/resolv.conf") {
 				label.Relabel(container.ResolvConfPath, container.MountLabel, shared)
 			}

 			writable := !container.HostConfig.ReadonlyRootfs
 			if m, exists := container.MountPoints["/etc/resolv.conf"]; exists {
 				writable = m.RW
 			}

 			mounts = append(mounts, Mount{

 				Source:      container.ResolvConfPath,
 				Destination: "/etc/resolv.conf",
 				Writable:    writable,

 				Propagation: string(volume.DefaultPropagationMode),

 			})
 		}
 	}
 	if container.HostnamePath != "" {
 		if _, err := os.Stat(container.HostnamePath); err != nil {
 			logrus.Warnf("HostnamePath set to %q, but can't stat this filename (err = %v); skipping", container.HostnamePath, err)
 		} else {

 			if !container.HasMountFor("/etc/hostname") {
 				label.Relabel(container.HostnamePath, container.MountLabel, shared)
 			}

 			writable := !container.HostConfig.ReadonlyRootfs
 			if m, exists := container.MountPoints["/etc/hostname"]; exists {
 				writable = m.RW
 			}

 			mounts = append(mounts, Mount{

 				Source:      container.HostnamePath,
 				Destination: "/etc/hostname",
 				Writable:    writable,

 				Propagation: string(volume.DefaultPropagationMode),

 			})
 		}
 	}
 	if container.HostsPath != "" {
 		if _, err := os.Stat(container.HostsPath); err != nil {
 			logrus.Warnf("HostsPath set to %q, but can't stat this filename (err = %v); skipping", container.HostsPath, err)
 		} else {

 			if !container.HasMountFor("/etc/hosts") {
 				label.Relabel(container.HostsPath, container.MountLabel, shared)
 			}

 			writable := !container.HostConfig.ReadonlyRootfs
 			if m, exists := container.MountPoints["/etc/hosts"]; exists {
 				writable = m.RW
 			}

 			mounts = append(mounts, Mount{

 				Source:      container.HostsPath,
 				Destination: "/etc/hosts",
 				Writable:    writable,

 				Propagation: string(volume.DefaultPropagationMode),

 			})
 		}
 	}
 	return mounts
 }
 
 // CopyImagePathContent copies files in destination to the volume.
 func (container *Container) CopyImagePathContent(v volume.Volume, destination string) error {
 	rootfs, err := symlink.FollowSymlinkInScope(filepath.Join(container.BaseFS, destination), container.BaseFS)
 	if err != nil {
 		return err
 	}
 
 	if _, err = ioutil.ReadDir(rootfs); err != nil {
 		if os.IsNotExist(err) {
 			return nil
 		}
 		return err
 	}
 

 	id := stringid.GenerateNonCryptoID()
 	path, err := v.Mount(id)

 	if err != nil {
 		return err
 	}

 
 	defer func() {
 		if err := v.Unmount(id); err != nil {
 			logrus.Warnf("error while unmounting volume %s: %v", v.Name(), err)
 		}
 	}()

 	if err := label.Relabel(path, container.MountLabel, true); err != nil && err != unix.ENOTSUP {

 		return err
 	}

 	return copyExistingContents(rootfs, path)

 }
 
 // ShmResourcePath returns path to shm
 func (container *Container) ShmResourcePath() (string, error) {
 	return container.GetRootResourcePath("shm")
 }
 
 // HasMountFor checks if path is a mountpoint
 func (container *Container) HasMountFor(path string) bool {
 	_, exists := container.MountPoints[path]
 	return exists
 }
 
 // UnmountIpcMounts uses the provided unmount function to unmount shm and mqueue if they were mounted
 func (container *Container) UnmountIpcMounts(unmount func(pth string) error) {
 	if container.HostConfig.IpcMode.IsContainer() || container.HostConfig.IpcMode.IsHost() {
 		return
 	}
 
 	var warnings []string
 
 	if !container.HasMountFor("/dev/shm") {
 		shmPath, err := container.ShmResourcePath()
 		if err != nil {
 			logrus.Error(err)
 			warnings = append(warnings, err.Error())
 		} else if shmPath != "" {

 			if err := unmount(shmPath); err != nil && !os.IsNotExist(err) {

 				if mounted, mErr := mount.Mounted(shmPath); mounted || mErr != nil {
 					warnings = append(warnings, fmt.Sprintf("failed to umount %s: %v", shmPath, err))
 				}

 			}
 
 		}
 	}
 
 	if len(warnings) > 0 {
 		logrus.Warnf("failed to cleanup ipc mounts:\n%v", strings.Join(warnings, "\n"))
 	}
 }
 
 // IpcMounts returns the list of IPC mounts

 func (container *Container) IpcMounts() []Mount {
 	var mounts []Mount

 
 	if !container.HasMountFor("/dev/shm") {
 		label.SetFileLabel(container.ShmPath, container.MountLabel)

 		mounts = append(mounts, Mount{

 			Source:      container.ShmPath,
 			Destination: "/dev/shm",
 			Writable:    true,

 			Propagation: string(volume.DefaultPropagationMode),

 		})
 	}
 

 	return mounts

 }
 

 // SecretMounts returns the mounts for the secret path.

 func (container *Container) SecretMounts() []Mount {
 	var mounts []Mount
 	for _, r := range container.SecretReferences {

 		if r.File == nil {
 			continue
 		}

 		mounts = append(mounts, Mount{

 			Source:      container.SecretFilePath(*r),

 			Destination: getSecretTargetPath(r),

 			Writable:    false,

 		})

 	}
 

 	return mounts

 }
 
 // UnmountSecrets unmounts the local tmpfs for secrets
 func (container *Container) UnmountSecrets() error {

 	if _, err := os.Stat(container.SecretMountPath()); err != nil {
 		if os.IsNotExist(err) {
 			return nil
 		}

 		return err

 	}
 

 	return detachMounted(container.SecretMountPath())
 }
 

 // ConfigMounts returns the mounts for configs.
 func (container *Container) ConfigMounts() []Mount {
 	var mounts []Mount
 	for _, configRef := range container.ConfigReferences {
 		if configRef.File == nil {
 			continue
 		}
 		mounts = append(mounts, Mount{
 			Source:      container.ConfigFilePath(*configRef),
 			Destination: configRef.File.Name,
 			Writable:    false,
 		})
 	}
 
 	return mounts
 }
 

 // UpdateContainer updates configuration of a container. Callers must hold a Lock on the Container.

 func (container *Container) UpdateContainer(hostConfig *containertypes.HostConfig) error {

 	// update resources of container

 	resources := hostConfig.Resources
 	cResources := &container.HostConfig.Resources

 
 	// validate NanoCPUs, CPUPeriod, and CPUQuota

 	// Because NanoCPU effectively updates CPUPeriod/CPUQuota,

 	// once NanoCPU is already set, updating CPUPeriod/CPUQuota will be blocked, and vice versa.
 	// In the following we make sure the intended update (resources) does not conflict with the existing (cResource).
 	if resources.NanoCPUs > 0 && cResources.CPUPeriod > 0 {
 		return fmt.Errorf("Conflicting options: Nano CPUs cannot be updated as CPU Period has already been set")
 	}
 	if resources.NanoCPUs > 0 && cResources.CPUQuota > 0 {
 		return fmt.Errorf("Conflicting options: Nano CPUs cannot be updated as CPU Quota has already been set")
 	}
 	if resources.CPUPeriod > 0 && cResources.NanoCPUs > 0 {
 		return fmt.Errorf("Conflicting options: CPU Period cannot be updated as NanoCPUs has already been set")
 	}
 	if resources.CPUQuota > 0 && cResources.NanoCPUs > 0 {
 		return fmt.Errorf("Conflicting options: CPU Quota cannot be updated as NanoCPUs has already been set")
 	}
 

 	if resources.BlkioWeight != 0 {
 		cResources.BlkioWeight = resources.BlkioWeight
 	}
 	if resources.CPUShares != 0 {
 		cResources.CPUShares = resources.CPUShares
 	}

 	if resources.NanoCPUs != 0 {
 		cResources.NanoCPUs = resources.NanoCPUs
 	}

 	if resources.CPUPeriod != 0 {
 		cResources.CPUPeriod = resources.CPUPeriod
 	}
 	if resources.CPUQuota != 0 {
 		cResources.CPUQuota = resources.CPUQuota
 	}
 	if resources.CpusetCpus != "" {
 		cResources.CpusetCpus = resources.CpusetCpus
 	}
 	if resources.CpusetMems != "" {
 		cResources.CpusetMems = resources.CpusetMems
 	}
 	if resources.Memory != 0 {

 		// if memory limit smaller than already set memoryswap limit and doesn't
 		// update the memoryswap limit, then error out.
 		if resources.Memory > cResources.MemorySwap && resources.MemorySwap == 0 {
 			return fmt.Errorf("Memory limit should be smaller than already set memoryswap limit, update the memoryswap at the same time")
 		}

 		cResources.Memory = resources.Memory
 	}
 	if resources.MemorySwap != 0 {
 		cResources.MemorySwap = resources.MemorySwap
 	}
 	if resources.MemoryReservation != 0 {
 		cResources.MemoryReservation = resources.MemoryReservation
 	}
 	if resources.KernelMemory != 0 {
 		cResources.KernelMemory = resources.KernelMemory
 	}

 
 	// update HostConfig of container
 	if hostConfig.RestartPolicy.Name != "" {

 		if container.HostConfig.AutoRemove && !hostConfig.RestartPolicy.IsNone() {
 			return fmt.Errorf("Restart policy cannot be updated because AutoRemove is enabled for the container")
 		}

 		container.HostConfig.RestartPolicy = hostConfig.RestartPolicy
 	}

 
 	return nil
 }
 

 // DetachAndUnmount uses a detached mount on all mount destinations, then
 // unmounts each volume normally.
 // This is used from daemon/archive for `docker cp`
 func (container *Container) DetachAndUnmount(volumeEventLog func(name, action string, attributes map[string]string)) error {
 	networkMounts := container.NetworkMounts()
 	mountPaths := make([]string, 0, len(container.MountPoints)+len(networkMounts))

 
 	for _, mntPoint := range container.MountPoints {
 		dest, err := container.GetResourcePath(mntPoint.Destination)
 		if err != nil {

 			logrus.Warnf("Failed to get volume destination path for container '%s' at '%s' while lazily unmounting: %v", container.ID, mntPoint.Destination, err)
 			continue

 		}

 		mountPaths = append(mountPaths, dest)

 	}
 

 	for _, m := range networkMounts {
 		dest, err := container.GetResourcePath(m.Destination)
 		if err != nil {
 			logrus.Warnf("Failed to get volume destination path for container '%s' at '%s' while lazily unmounting: %v", container.ID, m.Destination, err)
 			continue

 		}

 		mountPaths = append(mountPaths, dest)
 	}

 	for _, mountPath := range mountPaths {
 		if err := detachMounted(mountPath); err != nil {
 			logrus.Warnf("%s unmountVolumes: Failed to do lazy umount fo volume '%s': %v", container.ID, mountPath, err)

 		}
 	}

 	return container.UnmountVolumes(volumeEventLog)

 }
 
 // copyExistingContents copies from the source to the destination and
 // ensures the ownership is appropriately set.
 func copyExistingContents(source, destination string) error {
 	volList, err := ioutil.ReadDir(source)
 	if err != nil {
 		return err
 	}
 	if len(volList) > 0 {
 		srcList, err := ioutil.ReadDir(destination)
 		if err != nil {
 			return err
 		}
 		if len(srcList) == 0 {

 			// If the source volume is empty, copies files from the root into the volume

 			if err := chrootarchive.NewArchiver(nil).CopyWithTar(source, destination); err != nil {

 				return err
 			}
 		}
 	}
 	return copyOwnership(source, destination)
 }
 
 // copyOwnership copies the permissions and uid:gid of the source file
 // to the destination file
 func copyOwnership(source, destination string) error {
 	stat, err := system.Stat(source)
 	if err != nil {
 		return err
 	}
 

 	destStat, err := system.Stat(destination)
 	if err != nil {

 		return err
 	}
 

 	// In some cases, even though UID/GID match and it would effectively be a no-op,
 	// this can return a permission denied error... for example if this is an NFS
 	// mount.
 	// Since it's not really an error that we can't chown to the same UID/GID, don't
 	// even bother trying in such cases.
 	if stat.UID() != destStat.UID() || stat.GID() != destStat.GID() {
 		if err := os.Chown(destination, int(stat.UID()), int(stat.GID())); err != nil {
 			return err
 		}
 	}
 
 	if stat.Mode() != destStat.Mode() {
 		return os.Chmod(destination, os.FileMode(stat.Mode()))
 	}
 	return nil

 }
 
 // TmpfsMounts returns the list of tmpfs mounts

 func (container *Container) TmpfsMounts() ([]Mount, error) {

 	var mounts []Mount

 	for dest, data := range container.HostConfig.Tmpfs {

 		mounts = append(mounts, Mount{

 			Source:      "tmpfs",
 			Destination: dest,
 			Data:        data,
 		})
 	}

 	for dest, mnt := range container.MountPoints {
 		if mnt.Type == mounttypes.TypeTmpfs {

 			data, err := volume.ConvertTmpfsOptions(mnt.Spec.TmpfsOptions, mnt.Spec.ReadOnly)

 			if err != nil {
 				return nil, err
 			}
 			mounts = append(mounts, Mount{
 				Source:      "tmpfs",
 				Destination: dest,
 				Data:        data,
 			})
 		}
 	}
 	return mounts, nil

 }

 
 // cleanResourcePath cleans a resource path and prepares to combine with mnt path
 func cleanResourcePath(path string) string {
 	return filepath.Join(string(os.PathSeparator), path)
 }

 // EnableServiceDiscoveryOnDefaultNetwork Enable service discovery on default network
 func (container *Container) EnableServiceDiscoveryOnDefaultNetwork() bool {
 	return false
 }

 
 // GetMountPoints gives a platform specific transformation to types.MountPoint. Callers must hold a Container lock.
 func (container *Container) GetMountPoints() []types.MountPoint {
 	mountPoints := make([]types.MountPoint, 0, len(container.MountPoints))
 	for _, m := range container.MountPoints {
 		mountPoints = append(mountPoints, types.MountPoint{
 			Type:        m.Type,
 			Name:        m.Name,
 			Source:      m.Path(),
 			Destination: m.Destination,
 			Driver:      m.Driver,
 			Mode:        m.Mode,
 			RW:          m.RW,
 			Propagation: m.Propagation,
 		})
 	}
 	return mountPoints
 }