container/container.go
package container // import "github.com/docker/docker/container"
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"os"
"path/filepath"
"runtime"
"strings"
"syscall"
"time"
"github.com/containerd/containerd/cio"
"github.com/containerd/log"
containertypes "github.com/docker/docker/api/types/container"
"github.com/docker/docker/api/types/events"
mounttypes "github.com/docker/docker/api/types/mount"
swarmtypes "github.com/docker/docker/api/types/swarm"
"github.com/docker/docker/container/stream"
"github.com/docker/docker/daemon/logger"
"github.com/docker/docker/daemon/logger/jsonfilelog"
"github.com/docker/docker/daemon/logger/local"
"github.com/docker/docker/daemon/logger/loggerutils/cache"
"github.com/docker/docker/daemon/network"
"github.com/docker/docker/errdefs"
"github.com/docker/docker/image"
"github.com/docker/docker/layer"
libcontainerdtypes "github.com/docker/docker/libcontainerd/types"
"github.com/docker/docker/oci"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/docker/pkg/ioutils"
"github.com/docker/docker/restartmanager"
"github.com/docker/docker/volume"
volumemounts "github.com/docker/docker/volume/mounts"
units "github.com/docker/go-units"
agentexec "github.com/moby/swarmkit/v2/agent/exec"
"github.com/moby/sys/signal"
"github.com/moby/sys/symlink"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
)
const (
configFileName = "config.v2.json"
hostConfigFileName = "hostconfig.json"
)
// ExitStatus provides exit reasons for a container.
type ExitStatus struct {
// The exit code with which the container exited.
ExitCode int
// Time at which the container died
ExitedAt time.Time
}
// Container holds the structure defining a container object.
type Container struct {
StreamConfig *stream.Config
// embed for Container to support states directly.
*State `json:"State"` // Needed for Engine API version <= 1.11
Root string `json:"-"` // Path to the "home" of the container, including metadata.
BaseFS string `json:"-"` // Path to the graphdriver mountpoint
RWLayer layer.RWLayer `json:"-"`
ID string
Created time.Time
Managed bool
Path string
Args []string
Config *containertypes.Config
ImageID image.ID `json:"Image"`
ImageManifest *ocispec.Descriptor
NetworkSettings *network.Settings
LogPath string
Name string
Driver string
OS string
RestartCount int
HasBeenStartedBefore bool
HasBeenManuallyStopped bool // used for unless-stopped restart policy
HasBeenManuallyRestarted bool `json:"-"` // used to distinguish restart caused by restart policy from the manual one
MountPoints map[string]*volumemounts.MountPoint
HostConfig *containertypes.HostConfig `json:"-"` // do not serialize the host config in the json, otherwise we'll make the container unportable
ExecCommands *ExecStore `json:"-"`
DependencyStore agentexec.DependencyGetter `json:"-"`
SecretReferences []*swarmtypes.SecretReference
ConfigReferences []*swarmtypes.ConfigReference
// logDriver for closing
LogDriver logger.Logger `json:"-"`
LogCopier *logger.Copier `json:"-"`
restartManager *restartmanager.RestartManager
attachContext *attachContext
// Fields here are specific to Unix platforms
SecurityOptions
HostnamePath string
HostsPath string
ShmPath string
ResolvConfPath string
// Fields here are specific to Windows
NetworkSharedContainerID string `json:"-"`
SharedEndpointList []string `json:"-"`
LocalLogCacheMeta localLogCacheMeta `json:",omitempty"`
}
type SecurityOptions struct {
// MountLabel contains the options for the "mount" command.
MountLabel string
ProcessLabel string
AppArmorProfile string
SeccompProfile string
NoNewPrivileges bool
}
type localLogCacheMeta struct {
HaveNotifyEnabled bool
}
// NewBaseContainer creates a new container with its
// basic configuration.
func NewBaseContainer(id, root string) *Container {
return &Container{
ID: id,
State: NewState(),
ExecCommands: NewExecStore(),
Root: root,
MountPoints: make(map[string]*volumemounts.MountPoint),
StreamConfig: stream.NewConfig(),
attachContext: &attachContext{},
}
}
// FromDisk loads the container configuration stored in the host.
func (container *Container) FromDisk() error {
pth, err := container.ConfigPath()
if err != nil {
return err
}
jsonSource, err := os.Open(pth)
if err != nil {
return err
}
defer jsonSource.Close()
dec := json.NewDecoder(jsonSource)
// Load container settings
if err := dec.Decode(container); err != nil {
return err
}
// Ensure the operating system is set if blank. Assume it is the OS of the
// host OS if not, to ensure containers created before multiple-OS
// support are migrated
if container.OS == "" {
container.OS = runtime.GOOS
}
return container.readHostConfig()
}
// toDisk writes the container's configuration (config.v2.json, hostconfig.json)
// to disk and returns a deep copy.
func (container *Container) toDisk() (*Container, error) {
pth, err := container.ConfigPath()
if err != nil {
return nil, err
}
// Save container settings
f, err := ioutils.NewAtomicFileWriter(pth, 0o600)
if err != nil {
return nil, err
}
defer f.Close()
var buf bytes.Buffer
w := io.MultiWriter(&buf, f)
if err := json.NewEncoder(w).Encode(container); err != nil {
return nil, err
}
var deepCopy Container
if err := json.NewDecoder(&buf).Decode(&deepCopy); err != nil {
return nil, err
}
deepCopy.HostConfig, err = container.WriteHostConfig()
if err != nil {
return nil, err
}
return &deepCopy, nil
}
// CheckpointTo makes the Container's current state visible to queries, and persists state.
// Callers must hold a Container lock.
func (container *Container) CheckpointTo(ctx context.Context, store *ViewDB) error {
ctx, span := otel.Tracer("").Start(ctx, "container.CheckpointTo", trace.WithAttributes(
attribute.String("container.ID", container.ID),
attribute.String("container.Name", container.Name)))
defer span.End()
deepCopy, err := container.toDisk()
if err != nil {
return err
}
return store.Save(deepCopy)
}
// readHostConfig reads the host configuration from disk for the container.
func (container *Container) readHostConfig() error {
container.HostConfig = &containertypes.HostConfig{}
// If the hostconfig file does not exist, do not read it.
// (We still have to initialize container.HostConfig,
// but that's OK, since we just did that above.)
pth, err := container.HostConfigPath()
if err != nil {
return err
}
f, err := os.Open(pth)
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
defer f.Close()
if err := json.NewDecoder(f).Decode(&container.HostConfig); err != nil {
return err
}
container.InitDNSHostConfig()
return nil
}
// WriteHostConfig saves the host configuration on disk for the container,
// and returns a deep copy of the saved object. Callers must hold a Container lock.
func (container *Container) WriteHostConfig() (*containertypes.HostConfig, error) {
var (
buf bytes.Buffer
deepCopy containertypes.HostConfig
)
pth, err := container.HostConfigPath()
if err != nil {
return nil, err
}
f, err := ioutils.NewAtomicFileWriter(pth, 0o600)
if err != nil {
return nil, err
}
defer f.Close()
w := io.MultiWriter(&buf, f)
if err := json.NewEncoder(w).Encode(&container.HostConfig); err != nil {
return nil, err
}
if err := json.NewDecoder(&buf).Decode(&deepCopy); err != nil {
return nil, err
}
return &deepCopy, nil
}
// CommitInMemory makes the Container's current state visible to queries,
// but does not persist state.
//
// Callers must hold a Container lock.
func (container *Container) CommitInMemory(store *ViewDB) error {
var buf bytes.Buffer
if err := json.NewEncoder(&buf).Encode(container); err != nil {
return err
}
var deepCopy Container
if err := json.NewDecoder(&buf).Decode(&deepCopy); err != nil {
return err
}
buf.Reset()
if err := json.NewEncoder(&buf).Encode(container.HostConfig); err != nil {
return err
}
if err := json.NewDecoder(&buf).Decode(&deepCopy.HostConfig); err != nil {
return err
}
return store.Save(&deepCopy)
}
// SetupWorkingDirectory sets up the container's working directory as set in container.Config.WorkingDir
func (container *Container) SetupWorkingDirectory(rootIdentity idtools.Identity) error {
if container.Config.WorkingDir == "" {
return nil
}
workdir := filepath.Clean(container.Config.WorkingDir)
pth, err := container.GetResourcePath(workdir)
if err != nil {
return err
}
if err := idtools.MkdirAllAndChownNew(pth, 0o755, rootIdentity); err != nil {
pthInfo, err2 := os.Stat(pth)
if err2 == nil && pthInfo != nil && !pthInfo.IsDir() {
return errors.Errorf("Cannot mkdir: %s is not a directory", container.Config.WorkingDir)
}
return err
}
return nil
}
// GetResourcePath evaluates `path` in the scope of the container's BaseFS, with proper path
// sanitization. Symlinks are all scoped to the BaseFS of the container, as
// though the container's BaseFS was `/`.
//
// The BaseFS of a container is the host-facing path which is bind-mounted as
// `/` inside the container. This method is essentially used to access a
// particular path inside the container as though you were a process in that
// container.
//
// # NOTE
// The returned path is *only* safely scoped inside the container's BaseFS
// if no component of the returned path changes (such as a component
// symlinking to a different path) between using this method and using the
// path. See symlink.FollowSymlinkInScope for more details.
func (container *Container) GetResourcePath(path string) (string, error) {
if container.BaseFS == "" {
return "", errors.New("GetResourcePath: BaseFS of container " + container.ID + " is unexpectedly empty")
}
// IMPORTANT - These are paths on the OS where the daemon is running, hence
// any filepath operations must be done in an OS-agnostic way.
r, e := symlink.FollowSymlinkInScope(filepath.Join(container.BaseFS, cleanScopedPath(path)), container.BaseFS)
// Log this here on the daemon side as there's otherwise no indication apart
// from the error being propagated all the way back to the client. This makes
// debugging significantly easier and clearly indicates the error comes from the daemon.
if e != nil {
log.G(context.TODO()).Errorf("Failed to ResolveScopedPath BaseFS %s path %s %s\n", container.BaseFS, path, e)
}
return r, e
}
// cleanScopedPath prepares the given path to be combined with a mount path or
// a drive-letter. On Windows, it removes any existing driveletter (e.g. "C:").
// The returned path is always prefixed with a [filepath.Separator].
func cleanScopedPath(path string) string {
if len(path) >= 2 {
if v := filepath.VolumeName(path); len(v) > 0 {
path = path[len(v):]
}
}
return filepath.Join(string(filepath.Separator), path)
}
// GetRootResourcePath evaluates `path` in the scope of the container's root, with proper path
// sanitization. Symlinks are all scoped to the root of the container, as
// though the container's root was `/`.
//
// The root of a container is the host-facing configuration metadata directory.
// Only use this method to safely access the container's `container.json` or
// other metadata files. If in doubt, use container.GetResourcePath.
//
// # NOTE
// The returned path is *only* safely scoped inside the container's root
// if no component of the returned path changes (such as a component
// symlinking to a different path) between using this method and using the
// path. See symlink.FollowSymlinkInScope for more details.
func (container *Container) GetRootResourcePath(path string) (string, error) {
// IMPORTANT - These are paths on the OS where the daemon is running, hence
// any filepath operations must be done in an OS agnostic way.
cleanPath := filepath.Join(string(os.PathSeparator), path)
return symlink.FollowSymlinkInScope(filepath.Join(container.Root, cleanPath), container.Root)
}
// ExitOnNext signals to the monitor that it should not restart the container
// after we send the kill signal.
func (container *Container) ExitOnNext() {
container.RestartManager().Cancel()
}
// HostConfigPath returns the path to the container's JSON hostconfig
func (container *Container) HostConfigPath() (string, error) {
return container.GetRootResourcePath(hostConfigFileName)
}
// ConfigPath returns the path to the container's JSON config
func (container *Container) ConfigPath() (string, error) {
return container.GetRootResourcePath(configFileName)
}
// CheckpointDir returns the directory checkpoints are stored in
func (container *Container) CheckpointDir() string {
return filepath.Join(container.Root, "checkpoints")
}
// StartLogger starts a new logger driver for the container.
func (container *Container) StartLogger() (logger.Logger, error) {
cfg := container.HostConfig.LogConfig
initDriver, err := logger.GetLogDriver(cfg.Type)
if err != nil {
return nil, errors.Wrap(err, "failed to get logging factory")
}
info := logger.Info{
Config: cfg.Config,
ContainerID: container.ID,
ContainerName: container.Name,
ContainerEntrypoint: container.Path,
ContainerArgs: container.Args,
ContainerImageID: container.ImageID.String(),
ContainerImageName: container.Config.Image,
ContainerCreated: container.Created,
ContainerEnv: container.Config.Env,
ContainerLabels: container.Config.Labels,
DaemonName: "docker",
}
// Set logging file for "json-logger"
// TODO(@cpuguy83): Setup here based on log driver is a little weird.
switch cfg.Type {
case jsonfilelog.Name:
info.LogPath, err = container.GetRootResourcePath(fmt.Sprintf("%s-json.log", container.ID))
if err != nil {
return nil, err
}
container.LogPath = info.LogPath
case local.Name:
// Do not set container.LogPath for the local driver
// This would expose the value to the API, which should not be done as it means
// that the log file implementation would become a stable API that cannot change.
logDir, err := container.GetRootResourcePath("local-logs")
if err != nil {
return nil, err
}
if err := os.MkdirAll(logDir, 0o700); err != nil {
return nil, errdefs.System(errors.Wrap(err, "error creating local logs dir"))
}
info.LogPath = filepath.Join(logDir, "container.log")
}
l, err := initDriver(info)
if err != nil {
return nil, err
}
if containertypes.LogMode(cfg.Config["mode"]) == containertypes.LogModeNonBlock {
bufferSize := int64(-1)
if s, exists := cfg.Config["max-buffer-size"]; exists {
bufferSize, err = units.RAMInBytes(s)
if err != nil {
return nil, err
}
}
l = logger.NewRingLogger(l, info, bufferSize)
}
if _, ok := l.(logger.LogReader); !ok {
if cache.ShouldUseCache(cfg.Config) {
logPath, err := container.GetRootResourcePath("container-cached.log")
if err != nil {
return nil, err
}
if !container.LocalLogCacheMeta.HaveNotifyEnabled {
log.G(context.TODO()).WithField("container", container.ID).WithField("driver", container.HostConfig.LogConfig.Type).Info("Configured log driver does not support reads, enabling local file cache for container logs")
container.LocalLogCacheMeta.HaveNotifyEnabled = true
}
info.LogPath = logPath
l, err = cache.WithLocalCache(l, info)
if err != nil {
return nil, errors.Wrap(err, "error setting up local container log cache")
}
}
}
return l, nil
}
// GetProcessLabel returns the process label for the container.
func (container *Container) GetProcessLabel() string {
// even if we have a process label return "" if we are running
// in privileged mode
if container.HostConfig.Privileged {
return ""
}
return container.ProcessLabel
}
// GetMountLabel returns the mounting label for the container.
// This label is empty if the container is privileged.
func (container *Container) GetMountLabel() string {
return container.MountLabel
}
// GetExecIDs returns the list of exec commands running on the container.
func (container *Container) GetExecIDs() []string {
return container.ExecCommands.List()
}
// ShouldRestart decides whether the daemon should restart the container or not.
// This is based on the container's restart policy.
func (container *Container) ShouldRestart() bool {
shouldRestart, _, _ := container.RestartManager().ShouldRestart(uint32(container.ExitCode()), container.HasBeenManuallyStopped, container.FinishedAt.Sub(container.StartedAt))
return shouldRestart
}
// AddMountPointWithVolume adds a new mount point configured with a volume to the container.
func (container *Container) AddMountPointWithVolume(destination string, vol volume.Volume, rw bool) {
volumeParser := volumemounts.NewParser()
container.MountPoints[destination] = &volumemounts.MountPoint{
Type: mounttypes.TypeVolume,
Name: vol.Name(),
Driver: vol.DriverName(),
Destination: destination,
RW: rw,
Volume: vol,
CopyData: volumeParser.DefaultCopyMode(),
}
}
// UnmountVolumes unmounts all volumes
func (container *Container) UnmountVolumes(ctx context.Context, volumeEventLog func(name string, action events.Action, attributes map[string]string)) error {
var errs []string
for _, volumeMount := range container.MountPoints {
if volumeMount.Volume == nil {
continue
}
if err := volumeMount.Cleanup(ctx); err != nil {
errs = append(errs, err.Error())
continue
}
volumeEventLog(volumeMount.Volume.Name(), events.ActionUnmount, map[string]string{
"driver": volumeMount.Volume.DriverName(),
"container": container.ID,
})
}
if len(errs) > 0 {
return fmt.Errorf("error while unmounting volumes for container %s: %s", container.ID, strings.Join(errs, "; "))
}
return nil
}
// IsDestinationMounted checks whether a path is mounted on the container or not.
func (container *Container) IsDestinationMounted(destination string) bool {
return container.MountPoints[destination] != nil
}
// StopSignal returns the signal used to stop the container.
func (container *Container) StopSignal() syscall.Signal {
var stopSignal syscall.Signal
if container.Config.StopSignal != "" {
stopSignal, _ = signal.ParseSignal(container.Config.StopSignal)
}
if stopSignal == 0 {
stopSignal, _ = signal.ParseSignal(defaultStopSignal)
}
return stopSignal
}
// StopTimeout returns the timeout (in seconds) used to stop the container.
func (container *Container) StopTimeout() int {
if container.Config.StopTimeout != nil {
return *container.Config.StopTimeout
}
return defaultStopTimeout
}
// InitDNSHostConfig ensures that the dns fields are never nil.
// New containers don't ever have those fields nil,
// but pre created containers can still have those nil values.
// The non-recommended host configuration in the start api can
// make these fields nil again, this corrects that issue until
// we remove that behavior for good.
// See https://github.com/docker/docker/pull/17779
// for a more detailed explanation on why we don't want that.
func (container *Container) InitDNSHostConfig() {
container.Lock()
defer container.Unlock()
if container.HostConfig.DNS == nil {
container.HostConfig.DNS = make([]string, 0)
}
if container.HostConfig.DNSSearch == nil {
container.HostConfig.DNSSearch = make([]string, 0)
}
if container.HostConfig.DNSOptions == nil {
container.HostConfig.DNSOptions = make([]string, 0)
}
}
// UpdateMonitor updates monitor configure for running container
func (container *Container) UpdateMonitor(restartPolicy containertypes.RestartPolicy) {
container.RestartManager().SetPolicy(restartPolicy)
}
// FullHostname returns hostname and optional domain appended to it.
func (container *Container) FullHostname() string {
fullHostname := container.Config.Hostname
if container.Config.Domainname != "" {
fullHostname = fmt.Sprintf("%s.%s", fullHostname, container.Config.Domainname)
}
return fullHostname
}
// RestartManager returns the current restartmanager instance connected to container.
func (container *Container) RestartManager() *restartmanager.RestartManager {
if container.restartManager == nil {
container.restartManager = restartmanager.New(container.HostConfig.RestartPolicy, container.RestartCount)
}
return container.restartManager
}
// ResetRestartManager initializes new restartmanager based on container config
func (container *Container) ResetRestartManager(resetCount bool) {
if container.restartManager != nil {
container.restartManager.Cancel()
}
if resetCount {
container.RestartCount = 0
}
container.restartManager = nil
}
// AttachContext returns the context for attach calls to track container liveness.
func (container *Container) AttachContext() context.Context {
return container.attachContext.init()
}
// CancelAttachContext cancels attach context. All attach calls should detach
// after this call.
func (container *Container) CancelAttachContext() {
container.attachContext.cancel()
}
func (container *Container) startLogging() error {
if container.HostConfig.LogConfig.Type == "none" {
return nil // do not start logging routines
}
l, err := container.StartLogger()
if err != nil {
return fmt.Errorf("failed to initialize logging driver: %v", err)
}
copier := logger.NewCopier(map[string]io.Reader{"stdout": container.StdoutPipe(), "stderr": container.StderrPipe()}, l)
container.LogCopier = copier
copier.Run()
container.LogDriver = l
return nil
}
// StdinPipe gets the stdin stream of the container
func (container *Container) StdinPipe() io.WriteCloser {
return container.StreamConfig.StdinPipe()
}
// StdoutPipe gets the stdout stream of the container
func (container *Container) StdoutPipe() io.ReadCloser {
return container.StreamConfig.StdoutPipe()
}
// StderrPipe gets the stderr stream of the container
func (container *Container) StderrPipe() io.ReadCloser {
return container.StreamConfig.StderrPipe()
}
// CloseStreams closes the container's stdio streams
func (container *Container) CloseStreams() error {
return container.StreamConfig.CloseStreams()
}
// InitializeStdio is called by libcontainerd to connect the stdio.
func (container *Container) InitializeStdio(iop *cio.DirectIO) (cio.IO, error) {
if err := container.startLogging(); err != nil {
container.Reset(false)
return nil, err
}
container.StreamConfig.CopyToPipe(iop)
if container.StreamConfig.Stdin() == nil && !container.Config.Tty {
if iop.Stdin != nil {
if err := iop.Stdin.Close(); err != nil {
log.G(context.TODO()).Warnf("error closing stdin: %+v", err)
}
}
}
return &rio{IO: iop, sc: container.StreamConfig}, nil
}
// MountsResourcePath returns the path where mounts are stored for the given mount
func (container *Container) MountsResourcePath(mount string) (string, error) {
return container.GetRootResourcePath(filepath.Join("mounts", mount))
}
// SecretMountPath returns the path of the secret mount for the container
func (container *Container) SecretMountPath() (string, error) {
return container.MountsResourcePath("secrets")
}
// SecretFilePath returns the path to the location of a secret on the host.
func (container *Container) SecretFilePath(secretRef swarmtypes.SecretReference) (string, error) {
secrets, err := container.SecretMountPath()
if err != nil {
return "", err
}
return filepath.Join(secrets, secretRef.SecretID), nil
}
func getSecretTargetPath(r *swarmtypes.SecretReference) string {
if filepath.IsAbs(r.File.Name) {
return r.File.Name
}
return filepath.Join(containerSecretMountPath, r.File.Name)
}
// getConfigTargetPath makes sure that config paths inside the container are
// absolute, as required by the runtime spec, and enforced by runc >= 1.0.0-rc94.
// see https://github.com/opencontainers/runc/issues/2928
func getConfigTargetPath(r *swarmtypes.ConfigReference) string {
if filepath.IsAbs(r.File.Name) {
return r.File.Name
}
return filepath.Join(containerConfigMountPath, r.File.Name)
}
// CreateDaemonEnvironment creates a new environment variable slice for this container.
func (container *Container) CreateDaemonEnvironment(tty bool, linkedEnv []string) []string {
// Setup environment
ctrOS := container.OS
if ctrOS == "" {
ctrOS = runtime.GOOS
}
// Figure out what size slice we need so we can allocate this all at once.
envSize := len(container.Config.Env)
if runtime.GOOS != "windows" {
envSize += 2 + len(linkedEnv)
}
if tty {
envSize++
}
env := make([]string, 0, envSize)
if runtime.GOOS != "windows" {
env = append(env, "PATH="+oci.DefaultPathEnv(ctrOS))
env = append(env, "HOSTNAME="+container.Config.Hostname)
if tty {
env = append(env, "TERM=xterm")
}
env = append(env, linkedEnv...)
}
// because the env on the container can override certain default values
// we need to replace the 'env' keys where they match and append anything
// else.
env = ReplaceOrAppendEnvValues(env, container.Config.Env)
return env
}
// RestoreTask restores the containerd container and task handles and reattaches
// the IO for the running task. Container state is not synced with containerd's
// state.
//
// An errdefs.NotFound error is returned if the container does not exist in
// containerd. However, a nil error is returned if the task does not exist in
// containerd.
func (container *Container) RestoreTask(ctx context.Context, client libcontainerdtypes.Client) error {
container.Lock()
defer container.Unlock()
var err error
container.ctr, err = client.LoadContainer(ctx, container.ID)
if err != nil {
return err
}
container.task, err = container.ctr.AttachTask(ctx, container.InitializeStdio)
if err != nil && !errdefs.IsNotFound(err) {
return err
}
return nil
}
// GetRunningTask asserts that the container is running and returns the Task for
// the container. An errdefs.Conflict error is returned if the container is not
// in the Running state.
//
// A system error is returned if container is in a bad state: Running is true
// but has a nil Task.
//
// The container lock must be held when calling this method.
func (container *Container) GetRunningTask() (libcontainerdtypes.Task, error) {
if !container.Running {
return nil, errdefs.Conflict(fmt.Errorf("container %s is not running", container.ID))
}
tsk, ok := container.Task()
if !ok {
return nil, errdefs.System(errors.WithStack(fmt.Errorf("container %s is in Running state but has no containerd Task set", container.ID)))
}
return tsk, nil
}
type rio struct {
cio.IO
sc *stream.Config
}
func (i *rio) Close() error {
i.IO.Close()
return i.sc.CloseStreams()
}
func (i *rio) Wait() {
i.sc.Wait(context.Background())
i.IO.Wait()
}