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package libpod
import (
"bytes"
"context"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
"time"
metadata "github.com/checkpoint-restore/checkpointctl/lib"
"github.com/containers/buildah/copier"
"github.com/containers/buildah/pkg/overlay"
butil "github.com/containers/buildah/util"
"github.com/containers/common/libnetwork/etchosts"
"github.com/containers/common/libnetwork/resolvconf"
"github.com/containers/common/pkg/cgroups"
"github.com/containers/common/pkg/chown"
"github.com/containers/common/pkg/config"
cutil "github.com/containers/common/pkg/util"
"github.com/containers/podman/v4/libpod/define"
"github.com/containers/podman/v4/libpod/events"
"github.com/containers/podman/v4/pkg/ctime"
"github.com/containers/podman/v4/pkg/hooks"
"github.com/containers/podman/v4/pkg/hooks/exec"
"github.com/containers/podman/v4/pkg/lookup"
"github.com/containers/podman/v4/pkg/rootless"
"github.com/containers/podman/v4/pkg/selinux"
"github.com/containers/podman/v4/pkg/util"
"github.com/containers/storage"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/idtools"
"github.com/containers/storage/pkg/lockfile"
"github.com/containers/storage/pkg/mount"
"github.com/coreos/go-systemd/v22/daemon"
securejoin "github.com/cyphar/filepath-securejoin"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/opencontainers/runtime-tools/generate"
"github.com/opencontainers/selinux/go-selinux/label"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
)
const (
// name of the directory holding the artifacts
artifactsDir = "artifacts"
execDirPermission = 0755
preCheckpointDir = "pre-checkpoint"
)
// rootFsSize gets the size of the container's root filesystem
// A container FS is split into two parts. The first is the top layer, a
// mutable layer, and the rest is the RootFS: the set of immutable layers
// that make up the image on which the container is based.
func (c *Container) rootFsSize() (int64, error) {
if c.config.Rootfs != "" {
return 0, nil
}
if c.runtime.store == nil {
return 0, nil
}
container, err := c.runtime.store.Container(c.ID())
if err != nil {
return 0, err
}
// Ignore the size of the top layer. The top layer is a mutable RW layer
// and is not considered a part of the rootfs
rwLayer, err := c.runtime.store.Layer(container.LayerID)
if err != nil {
return 0, err
}
layer, err := c.runtime.store.Layer(rwLayer.Parent)
if err != nil {
return 0, err
}
size := int64(0)
for layer.Parent != "" {
layerSize, err := c.runtime.store.DiffSize(layer.Parent, layer.ID)
if err != nil {
return size, errors.Wrapf(err, "getting diffsize of layer %q and its parent %q", layer.ID, layer.Parent)
}
size += layerSize
layer, err = c.runtime.store.Layer(layer.Parent)
if err != nil {
return 0, err
}
}
// Get the size of the last layer. Has to be outside of the loop
// because the parent of the last layer is "", and lstore.Get("")
// will return an error.
layerSize, err := c.runtime.store.DiffSize(layer.Parent, layer.ID)
return size + layerSize, err
}
// rwSize gets the size of the mutable top layer of the container.
func (c *Container) rwSize() (int64, error) {
if c.config.Rootfs != "" {
size, err := util.SizeOfPath(c.config.Rootfs)
return int64(size), err
}
container, err := c.runtime.store.Container(c.ID())
if err != nil {
return 0, err
}
// The top layer of a container is
// the only readable/writeable layer, all others are immutable.
rwLayer, err := c.runtime.store.Layer(container.LayerID)
if err != nil {
return 0, err
}
// Get the size of the top layer by calculating the size of the diff
// between the layer and its parent.
return c.runtime.store.DiffSize(rwLayer.Parent, rwLayer.ID)
}
// bundlePath returns the path to the container's root filesystem - where the OCI spec will be
// placed, amongst other things
func (c *Container) bundlePath() string {
return c.config.StaticDir
}
// ControlSocketPath returns the path to the containers control socket for things like tty
// resizing
func (c *Container) ControlSocketPath() string {
return filepath.Join(c.bundlePath(), "ctl")
}
// CheckpointVolumesPath returns the path to the directory containing the checkpointed volumes
func (c *Container) CheckpointVolumesPath() string {
return filepath.Join(c.bundlePath(), metadata.CheckpointVolumesDirectory)
}
// CheckpointPath returns the path to the directory containing the checkpoint
func (c *Container) CheckpointPath() string {
return filepath.Join(c.bundlePath(), metadata.CheckpointDirectory)
}
// PreCheckpointPath returns the path to the directory containing the pre-checkpoint-images
func (c *Container) PreCheckPointPath() string {
return filepath.Join(c.bundlePath(), preCheckpointDir)
}
// AttachSocketPath retrieves the path of the container's attach socket
func (c *Container) AttachSocketPath() (string, error) {
return c.ociRuntime.AttachSocketPath(c)
}
// exitFilePath gets the path to the container's exit file
func (c *Container) exitFilePath() (string, error) {
return c.ociRuntime.ExitFilePath(c)
}
// Wait for the container's exit file to appear.
// When it does, update our state based on it.
func (c *Container) waitForExitFileAndSync() error {
exitFile, err := c.exitFilePath()
if err != nil {
return err
}
chWait := make(chan error)
defer close(chWait)
_, err = WaitForFile(exitFile, chWait, time.Second*5)
if err != nil {
// Exit file did not appear
// Reset our state
c.state.ExitCode = -1
c.state.FinishedTime = time.Now()
c.state.State = define.ContainerStateStopped
if err2 := c.save(); err2 != nil {
logrus.Errorf("Saving container %s state: %v", c.ID(), err2)
}
return err
}
if err := c.checkExitFile(); err != nil {
return err
}
return c.save()
}
// Handle the container exit file.
// The exit file is used to supply container exit time and exit code.
// This assumes the exit file already exists.
func (c *Container) handleExitFile(exitFile string, fi os.FileInfo) error {
c.state.FinishedTime = ctime.Created(fi)
statusCodeStr, err := ioutil.ReadFile(exitFile)
if err != nil {
return errors.Wrapf(err, "failed to read exit file for container %s", c.ID())
}
statusCode, err := strconv.Atoi(string(statusCodeStr))
if err != nil {
return errors.Wrapf(err, "error converting exit status code (%q) for container %s to int",
c.ID(), statusCodeStr)
}
c.state.ExitCode = int32(statusCode)
oomFilePath := filepath.Join(c.bundlePath(), "oom")
if _, err = os.Stat(oomFilePath); err == nil {
c.state.OOMKilled = true
}
c.state.Exited = true
// Write an event for the container's death
c.newContainerExitedEvent(c.state.ExitCode)
return c.runtime.state.AddContainerExitCode(c.ID(), c.state.ExitCode)
}
func (c *Container) shouldRestart() bool {
// If we did not get a restart policy match, return false
// Do the same if we're not a policy that restarts.
if !c.state.RestartPolicyMatch ||
c.config.RestartPolicy == define.RestartPolicyNo ||
c.config.RestartPolicy == define.RestartPolicyNone {
return false
}
// If we're RestartPolicyOnFailure, we need to check retries and exit
// code.
if c.config.RestartPolicy == define.RestartPolicyOnFailure {
if c.state.ExitCode == 0 {
return false
}
// If we don't have a max retries set, continue
if c.config.RestartRetries > 0 {
if c.state.RestartCount >= c.config.RestartRetries {
return false
}
}
}
return true
}
// Handle container restart policy.
// This is called when a container has exited, and was not explicitly stopped by
// an API call to stop the container or pod it is in.
func (c *Container) handleRestartPolicy(ctx context.Context) (_ bool, retErr error) {
if !c.shouldRestart() {
return false, nil
}
logrus.Debugf("Restarting container %s due to restart policy %s", c.ID(), c.config.RestartPolicy)
// Need to check if dependencies are alive.
if err := c.checkDependenciesAndHandleError(); err != nil {
return false, err
}
// Is the container running again?
// If so, we don't have to do anything
if c.ensureState(define.ContainerStateRunning, define.ContainerStatePaused) {
return false, nil
} else if c.state.State == define.ContainerStateUnknown {
return false, errors.Wrapf(define.ErrInternal, "invalid container state encountered in restart attempt")
}
c.newContainerEvent(events.Restart)
// Increment restart count
c.state.RestartCount++
logrus.Debugf("Container %s now on retry %d", c.ID(), c.state.RestartCount)
if err := c.save(); err != nil {
return false, err
}
defer func() {
if retErr != nil {
if err := c.cleanup(ctx); err != nil {
logrus.Errorf("Cleaning up container %s: %v", c.ID(), err)
}
}
}()
if err := c.prepare(); err != nil {
return false, err
}
// set up slirp4netns again because slirp4netns will die when conmon exits
if c.config.NetMode.IsSlirp4netns() {
err := c.runtime.setupSlirp4netns(c, c.state.NetNS)
if err != nil {
return false, err
}
}
// set up rootlesskit port forwarder again since it dies when conmon exits
// we use rootlesskit port forwarder only as rootless and when bridge network is used
if rootless.IsRootless() && c.config.NetMode.IsBridge() && len(c.config.PortMappings) > 0 {
err := c.runtime.setupRootlessPortMappingViaRLK(c, c.state.NetNS.Path(), c.state.NetworkStatus)
if err != nil {
return false, err
}
}
if c.state.State == define.ContainerStateStopped {
// Reinitialize the container if we need to
if err := c.reinit(ctx, true); err != nil {
return false, err
}
} else if c.ensureState(define.ContainerStateConfigured, define.ContainerStateExited) {
// Initialize the container
if err := c.init(ctx, true); err != nil {
return false, err
}
}
if err := c.start(); err != nil {
return false, err
}
return true, nil
}
// Ensure that the container is in a specific state or state.
// Returns true if the container is in one of the given states,
// or false otherwise.
func (c *Container) ensureState(states ...define.ContainerStatus) bool {
for _, state := range states {
if state == c.state.State {
return true
}
}
return false
}
// Sync this container with on-disk state and runtime status
// Should only be called with container lock held
// This function should suffice to ensure a container's state is accurate and
// it is valid for use.
func (c *Container) syncContainer() error {
if err := c.runtime.state.UpdateContainer(c); err != nil {
return err
}
// If runtime knows about the container, update its status in runtime
// And then save back to disk
if c.ensureState(define.ContainerStateCreated, define.ContainerStateRunning, define.ContainerStateStopped, define.ContainerStatePaused) {
oldState := c.state.State
if err := c.checkExitFile(); err != nil {
return err
}
// Only save back to DB if state changed
if c.state.State != oldState {
// Check for a restart policy match
if c.config.RestartPolicy != define.RestartPolicyNone && c.config.RestartPolicy != define.RestartPolicyNo &&
(oldState == define.ContainerStateRunning || oldState == define.ContainerStatePaused) &&
(c.state.State == define.ContainerStateStopped || c.state.State == define.ContainerStateExited) &&
!c.state.StoppedByUser {
c.state.RestartPolicyMatch = true
}
if err := c.save(); err != nil {
return err
}
}
}
if !c.valid {
return errors.Wrapf(define.ErrCtrRemoved, "container %s is not valid", c.ID())
}
return nil
}
func (c *Container) setupStorageMapping(dest, from *storage.IDMappingOptions) {
if c.config.Rootfs != "" {
return
}
*dest = *from
// If we are creating a container inside a pod, we always want to inherit the
// userns settings from the infra container. So clear the auto userns settings
// so that we don't request storage for a new uid/gid map.
if c.PodID() != "" && !c.IsInfra() {
dest.AutoUserNs = false
}
if dest.AutoUserNs {
overrides := c.getUserOverrides()
dest.AutoUserNsOpts.PasswdFile = overrides.ContainerEtcPasswdPath
dest.AutoUserNsOpts.GroupFile = overrides.ContainerEtcGroupPath
if c.config.User != "" {
initialSize := uint32(0)
parts := strings.Split(c.config.User, ":")
for _, p := range parts {
s, err := strconv.ParseUint(p, 10, 32)
if err == nil && uint32(s) > initialSize {
initialSize = uint32(s)
}
}
dest.AutoUserNsOpts.InitialSize = initialSize + 1
}
} else if c.config.Spec.Linux != nil {
dest.UIDMap = nil
for _, r := range c.config.Spec.Linux.UIDMappings {
u := idtools.IDMap{
ContainerID: int(r.ContainerID),
HostID: int(r.HostID),
Size: int(r.Size),
}
dest.UIDMap = append(dest.UIDMap, u)
}
dest.GIDMap = nil
for _, r := range c.config.Spec.Linux.GIDMappings {
g := idtools.IDMap{
ContainerID: int(r.ContainerID),
HostID: int(r.HostID),
Size: int(r.Size),
}
dest.GIDMap = append(dest.GIDMap, g)
}
dest.HostUIDMapping = false
dest.HostGIDMapping = false
}
}
// Create container root filesystem for use
func (c *Container) setupStorage(ctx context.Context) error {
if !c.valid {
return errors.Wrapf(define.ErrCtrRemoved, "container %s is not valid", c.ID())
}
if c.state.State != define.ContainerStateConfigured {
return errors.Wrapf(define.ErrCtrStateInvalid, "container %s must be in Configured state to have storage set up", c.ID())
}
// Need both an image ID and image name, plus a bool telling us whether to use the image configuration
if c.config.Rootfs == "" && (c.config.RootfsImageID == "" || c.config.RootfsImageName == "") {
return errors.Wrapf(define.ErrInvalidArg, "must provide image ID and image name to use an image")
}
options := storage.ContainerOptions{
IDMappingOptions: storage.IDMappingOptions{
HostUIDMapping: true,
HostGIDMapping: true,
},
LabelOpts: c.config.LabelOpts,
}
options.StorageOpt = c.config.StorageOpts
if c.restoreFromCheckpoint && c.config.ProcessLabel != "" && c.config.MountLabel != "" {
// If restoring from a checkpoint, the root file-system needs
// to be mounted with the same SELinux labels as it was mounted
// previously. But only if both labels have been set. For
// privileged containers or '--ipc host' only ProcessLabel will
// be set and so we will skip it for cases like that.
if options.Flags == nil {
options.Flags = make(map[string]interface{})
}
options.Flags["ProcessLabel"] = c.config.ProcessLabel
options.Flags["MountLabel"] = c.config.MountLabel
}
if c.config.Privileged {
privOpt := func(opt string) bool {
for _, privopt := range []string{"nodev", "nosuid", "noexec"} {
if opt == privopt {
return true
}
}
return false
}
defOptions, err := storage.GetMountOptions(c.runtime.store.GraphDriverName(), c.runtime.store.GraphOptions())
if err != nil {
return errors.Wrapf(err, "error getting default mount options")
}
var newOptions []string
for _, opt := range defOptions {
if !privOpt(opt) {
newOptions = append(newOptions, opt)
}
}
options.MountOpts = newOptions
}
options.Volatile = c.config.Volatile
c.setupStorageMapping(&options.IDMappingOptions, &c.config.IDMappings)
// Unless the user has specified a name, use a randomly generated one.
// Note that name conflicts may occur (see #11735), so we need to loop.
generateName := c.config.Name == ""
var containerInfo ContainerInfo
var containerInfoErr error
for {
if generateName {
name, err := c.runtime.generateName()
if err != nil {
return err
}
c.config.Name = name
}
containerInfo, containerInfoErr = c.runtime.storageService.CreateContainerStorage(ctx, c.runtime.imageContext, c.config.RootfsImageName, c.config.RootfsImageID, c.config.Name, c.config.ID, options)
if !generateName || errors.Cause(containerInfoErr) != storage.ErrDuplicateName {
break
}
}
if containerInfoErr != nil {
return errors.Wrapf(containerInfoErr, "error creating container storage")
}
// only reconfig IDMappings if layer was mounted from storage
// if its a external overlay do not reset IDmappings
if !c.config.RootfsOverlay {
c.config.IDMappings.UIDMap = containerInfo.UIDMap
c.config.IDMappings.GIDMap = containerInfo.GIDMap
}
processLabel, err := c.processLabel(containerInfo.ProcessLabel)
if err != nil {
return err
}
c.config.ProcessLabel = processLabel
c.config.MountLabel = containerInfo.MountLabel
c.config.StaticDir = containerInfo.Dir
c.state.RunDir = containerInfo.RunDir
if len(c.config.IDMappings.UIDMap) != 0 || len(c.config.IDMappings.GIDMap) != 0 {
if err := os.Chown(containerInfo.RunDir, c.RootUID(), c.RootGID()); err != nil {
return err
}
if err := os.Chown(containerInfo.Dir, c.RootUID(), c.RootGID()); err != nil {
return err
}
}
// Set the default Entrypoint and Command
if containerInfo.Config != nil {
// Set CMD in the container to the default configuration only if ENTRYPOINT is not set by the user.
if c.config.Entrypoint == nil && c.config.Command == nil {
c.config.Command = containerInfo.Config.Config.Cmd
}
if c.config.Entrypoint == nil {
c.config.Entrypoint = containerInfo.Config.Config.Entrypoint
}
}
artifacts := filepath.Join(c.config.StaticDir, artifactsDir)
if err := os.MkdirAll(artifacts, 0755); err != nil {
return errors.Wrap(err, "error creating artifacts directory")
}
return nil
}
func (c *Container) processLabel(processLabel string) (string, error) {
if !c.Systemd() && !c.ociRuntime.SupportsKVM() {
return processLabel, nil
}
ctrSpec, err := c.specFromState()
if err != nil {
return "", err
}
label, ok := ctrSpec.Annotations[define.InspectAnnotationLabel]
if !ok || !strings.Contains(label, "type:") {
switch {
case c.ociRuntime.SupportsKVM():
return selinux.KVMLabel(processLabel)
case c.Systemd():
return selinux.InitLabel(processLabel)
}
}
return processLabel, nil
}
// Tear down a container's storage prior to removal
func (c *Container) teardownStorage() error {
if c.ensureState(define.ContainerStateRunning, define.ContainerStatePaused) {
return errors.Wrapf(define.ErrCtrStateInvalid, "cannot remove storage for container %s as it is running or paused", c.ID())
}
artifacts := filepath.Join(c.config.StaticDir, artifactsDir)
if err := os.RemoveAll(artifacts); err != nil {
return errors.Wrapf(err, "error removing container %s artifacts %q", c.ID(), artifacts)
}
if err := c.cleanupStorage(); err != nil {
return errors.Wrapf(err, "failed to clean up container %s storage", c.ID())
}
if err := c.runtime.storageService.DeleteContainer(c.ID()); err != nil {
// If the container has already been removed, warn but do not
// error - we wanted it gone, it is already gone.
// Potentially another tool using containers/storage already
// removed it?
if errors.Cause(err) == storage.ErrNotAContainer || errors.Cause(err) == storage.ErrContainerUnknown {
logrus.Infof("Storage for container %s already removed", c.ID())
return nil
}
return errors.Wrapf(err, "error removing container %s root filesystem", c.ID())
}
return nil
}
// Reset resets state fields to default values.
// It is performed before a refresh and clears the state after a reboot.
// It does not save the results - assumes the database will do that for us.
func resetState(state *ContainerState) {
state.PID = 0
state.ConmonPID = 0
state.Mountpoint = ""
state.Mounted = false
if state.State != define.ContainerStateExited {
state.State = define.ContainerStateConfigured
}
state.ExecSessions = make(map[string]*ExecSession)
state.LegacyExecSessions = nil
state.BindMounts = make(map[string]string)
state.StoppedByUser = false
state.RestartPolicyMatch = false
state.RestartCount = 0
state.Checkpointed = false
state.Restored = false
state.CheckpointedTime = time.Time{}
state.RestoredTime = time.Time{}
state.CheckpointPath = ""
state.CheckpointLog = ""
state.RestoreLog = ""
}
// Refresh refreshes the container's state after a restart.
// Refresh cannot perform any operations that would lock another container.
// We cannot guarantee any other container has a valid lock at the time it is
// running.
func (c *Container) refresh() error {
// Don't need a full sync, but we do need to update from the database to
// pick up potentially-missing container state
if err := c.runtime.state.UpdateContainer(c); err != nil {
return err
}
if !c.valid {
return errors.Wrapf(define.ErrCtrRemoved, "container %s is not valid - may have been removed", c.ID())
}
// We need to get the container's temporary directory from c/storage
// It was lost in the reboot and must be recreated
dir, err := c.runtime.storageService.GetRunDir(c.ID())
if err != nil {
return errors.Wrapf(err, "error retrieving temporary directory for container %s", c.ID())
}
c.state.RunDir = dir
if len(c.config.IDMappings.UIDMap) != 0 || len(c.config.IDMappings.GIDMap) != 0 {
info, err := os.Stat(c.runtime.config.Engine.TmpDir)
if err != nil {
return err
}
if err := os.Chmod(c.runtime.config.Engine.TmpDir, info.Mode()|0111); err != nil {
return err
}
root := filepath.Join(c.runtime.config.Engine.TmpDir, "containers-root", c.ID())
if err := os.MkdirAll(root, 0755); err != nil {
return errors.Wrapf(err, "error creating userNS tmpdir for container %s", c.ID())
}
if err := os.Chown(root, c.RootUID(), c.RootGID()); err != nil {
return err
}
}
// We need to pick up a new lock
lock, err := c.runtime.lockManager.AllocateAndRetrieveLock(c.config.LockID)
if err != nil {
return errors.Wrapf(err, "error acquiring lock %d for container %s", c.config.LockID, c.ID())
}
c.lock = lock
c.state.NetworkStatus = nil
c.state.NetworkStatusOld = nil
// Rewrite the config if necessary.
// Podman 4.0 uses a new port format in the config.
// getContainerConfigFromDB() already converted the old ports to the new one
// but it did not write the config to the db back for performance reasons.
// If a rewrite must happen the config.rewrite field is set to true.
if c.config.rewrite {
// SafeRewriteContainerConfig must be used with care. Make sure to not change config fields by accident.
if err := c.runtime.state.SafeRewriteContainerConfig(c, "", "", c.config); err != nil {
return errors.Wrapf(err, "failed to rewrite the config for container %s", c.config.ID)
}
c.config.rewrite = false
}
if err := c.save(); err != nil {
return errors.Wrapf(err, "error refreshing state for container %s", c.ID())
}
// Remove ctl and attach files, which may persist across reboot
if err := c.removeConmonFiles(); err != nil {
return err
}
return nil
}
// Remove conmon attach socket and terminal resize FIFO
// This is necessary for restarting containers
func (c *Container) removeConmonFiles() error {
// Files are allowed to not exist, so ignore ENOENT
attachFile, err := c.AttachSocketPath()
if err != nil {
return errors.Wrapf(err, "failed to get attach socket path for container %s", c.ID())
}
if err := os.Remove(attachFile); err != nil && !os.IsNotExist(err) {
return errors.Wrapf(err, "error removing container %s attach file", c.ID())
}
ctlFile := filepath.Join(c.bundlePath(), "ctl")
if err := os.Remove(ctlFile); err != nil && !os.IsNotExist(err) {
return errors.Wrapf(err, "error removing container %s ctl file", c.ID())
}
winszFile := filepath.Join(c.bundlePath(), "winsz")
if err := os.Remove(winszFile); err != nil && !os.IsNotExist(err) {
return errors.Wrapf(err, "error removing container %s winsz file", c.ID())
}
oomFile := filepath.Join(c.bundlePath(), "oom")
if err := os.Remove(oomFile); err != nil && !os.IsNotExist(err) {
return errors.Wrapf(err, "error removing container %s OOM file", c.ID())
}
// Remove the exit file so we don't leak memory in tmpfs
exitFile, err := c.exitFilePath()
if err != nil {
return err
}
if err := os.Remove(exitFile); err != nil && !os.IsNotExist(err) {
return errors.Wrapf(err, "error removing container %s exit file", c.ID())
}
return nil
}
func (c *Container) export(path string) error {
mountPoint := c.state.Mountpoint
if !c.state.Mounted {
containerMount, err := c.runtime.store.Mount(c.ID(), c.config.MountLabel)
if err != nil {
return errors.Wrapf(err, "mounting container %q", c.ID())
}
mountPoint = containerMount
defer func() {
if _, err := c.runtime.store.Unmount(c.ID(), false); err != nil {
logrus.Errorf("Unmounting container %q: %v", c.ID(), err)
}
}()
}
input, err := archive.Tar(mountPoint, archive.Uncompressed)
if err != nil {
return errors.Wrapf(err, "error reading container directory %q", c.ID())
}
outFile, err := os.Create(path)
if err != nil {
return errors.Wrapf(err, "error creating file %q", path)
}
defer outFile.Close()
_, err = io.Copy(outFile, input)
return err
}
// Get path of artifact with a given name for this container
func (c *Container) getArtifactPath(name string) string {
return filepath.Join(c.config.StaticDir, artifactsDir, name)
}
// save container state to the database
func (c *Container) save() error {
if err := c.runtime.state.SaveContainer(c); err != nil {
return errors.Wrapf(err, "error saving container %s state", c.ID())
}
return nil
}
// Checks the container is in the right state, then initializes the container in preparation to start the container.
// If recursive is true, each of the containers dependencies will be started.
// Otherwise, this function will return with error if there are dependencies of this container that aren't running.
func (c *Container) prepareToStart(ctx context.Context, recursive bool) (retErr error) {
// Container must be created or stopped to be started
if !c.ensureState(define.ContainerStateConfigured, define.ContainerStateCreated, define.ContainerStateStopped, define.ContainerStateExited) {
return errors.Wrapf(define.ErrCtrStateInvalid, "container %s must be in Created or Stopped state to be started", c.ID())
}
if !recursive {
if err := c.checkDependenciesAndHandleError(); err != nil {
return err
}
} else {
if err := c.startDependencies(ctx); err != nil {
return err
}
}
defer func() {
if retErr != nil {
if err := c.cleanup(ctx); err != nil {
logrus.Errorf("Cleaning up container %s: %v", c.ID(), err)
}
}
}()
if err := c.prepare(); err != nil {
return err
}
if c.state.State == define.ContainerStateStopped {
// Reinitialize the container if we need to
if err := c.reinit(ctx, false); err != nil {
return err
}
} else if c.ensureState(define.ContainerStateConfigured, define.ContainerStateExited) {
// Or initialize it if necessary
if err := c.init(ctx, false); err != nil {
return err
}
}
return nil
}
// checks dependencies are running and prints a helpful message
func (c *Container) checkDependenciesAndHandleError() error {
notRunning, err := c.checkDependenciesRunning()
if err != nil {
return errors.Wrapf(err, "error checking dependencies for container %s", c.ID())
}
if len(notRunning) > 0 {
depString := strings.Join(notRunning, ",")
return errors.Wrapf(define.ErrCtrStateInvalid, "some dependencies of container %s are not started: %s", c.ID(), depString)
}
return nil
}
// Recursively start all dependencies of a container so the container can be started.
func (c *Container) startDependencies(ctx context.Context) error {
depCtrIDs := c.Dependencies()
if len(depCtrIDs) == 0 {
return nil
}
depVisitedCtrs := make(map[string]*Container)
if err := c.getAllDependencies(depVisitedCtrs); err != nil {
return errors.Wrapf(err, "error starting dependency for container %s", c.ID())
}
// Because of how Go handles passing slices through functions, a slice cannot grow between function calls
// without clunky syntax. Circumnavigate this by translating the map to a slice for buildContainerGraph
depCtrs := make([]*Container, 0)
for _, ctr := range depVisitedCtrs {
depCtrs = append(depCtrs, ctr)
}
// Build a dependency graph of containers
graph, err := BuildContainerGraph(depCtrs)
if err != nil {
return errors.Wrapf(err, "error generating dependency graph for container %s", c.ID())
}
// If there are no containers without dependencies, we can't start
// Error out
if len(graph.noDepNodes) == 0 {
// we have no dependencies that need starting, go ahead and return
if len(graph.nodes) == 0 {
return nil
}
return errors.Wrapf(define.ErrNoSuchCtr, "All dependencies have dependencies of %s", c.ID())
}
ctrErrors := make(map[string]error)
ctrsVisited := make(map[string]bool)
// Traverse the graph beginning at nodes with no dependencies
for _, node := range graph.noDepNodes {
startNode(ctx, node, false, ctrErrors, ctrsVisited, true)
}
if len(ctrErrors) > 0 {
logrus.Errorf("Starting some container dependencies")
for _, e := range ctrErrors {
logrus.Errorf("%q", e)
}
return errors.Wrapf(define.ErrInternal, "error starting some containers")
}
return nil
}
// getAllDependencies is a precursor to starting dependencies.
// To start a container with all of its dependencies, we need to recursively find all dependencies
// a container has, as well as each of those containers' dependencies, and so on
// To do so, keep track of containers already visited (so there aren't redundant state lookups),
// and recursively search until we have reached the leafs of every dependency node.
// Since we need to start all dependencies for our original container to successfully start, we propagate any errors
// in looking up dependencies.
// Note: this function is currently meant as a robust solution to a narrow problem: start an infra-container when
// a container in the pod is run. It has not been tested for performance past one level, so expansion of recursive start
// must be tested first.
func (c *Container) getAllDependencies(visited map[string]*Container) error {
depIDs := c.Dependencies()
if len(depIDs) == 0 {
return nil
}
for _, depID := range depIDs {
if _, ok := visited[depID]; !ok {
dep, err := c.runtime.state.Container(depID)
if err != nil {
return err
}
status, err := dep.State()
if err != nil {
return err
}
// if the dependency is already running, we can assume its dependencies are also running
// so no need to add them to those we need to start
if status != define.ContainerStateRunning {
visited[depID] = dep
if err := dep.getAllDependencies(visited); err != nil {
return err
}
}
}
}
return nil
}
// Check if a container's dependencies are running
// Returns a []string containing the IDs of dependencies that are not running
func (c *Container) checkDependenciesRunning() ([]string, error) {
deps := c.Dependencies()
notRunning := []string{}
// We were not passed a set of dependency containers
// Make it ourselves
depCtrs := make(map[string]*Container, len(deps))
for _, dep := range deps {
// Get the dependency container
depCtr, err := c.runtime.state.Container(dep)
if err != nil {
return nil, errors.Wrapf(err, "error retrieving dependency %s of container %s from state", dep, c.ID())
}
// Check the status
state, err := depCtr.State()
if err != nil {
return nil, errors.Wrapf(err, "error retrieving state of dependency %s of container %s", dep, c.ID())
}
if state != define.ContainerStateRunning && !depCtr.config.IsInfra {
notRunning = append(notRunning, dep)
}
depCtrs[dep] = depCtr
}
return notRunning, nil
}
func (c *Container) completeNetworkSetup() error {
var nameservers []string
netDisabled, err := c.NetworkDisabled()
if err != nil {
return err
}
if !c.config.PostConfigureNetNS || netDisabled {
return nil
}
if err := c.syncContainer(); err != nil {
return err
}
if err := c.runtime.setupNetNS(c); err != nil {
return err
}
if err := c.save(); err != nil {
return err
}
state := c.state
// collect any dns servers that cni tells us to use (dnsname)
for _, status := range c.getNetworkStatus() {
for _, server := range status.DNSServerIPs {
nameservers = append(nameservers, server.String())
}
}
// check if we have a bindmount for /etc/hosts
if hostsBindMount, ok := state.BindMounts[config.DefaultHostsFile]; ok {
entries, err := c.getHostsEntries()
if err != nil {
return err
}
// add new container ips to the hosts file
if err := etchosts.Add(hostsBindMount, entries); err != nil {
return err
}
}
// check if we have a bindmount for resolv.conf
resolvBindMount := state.BindMounts[resolvconf.DefaultResolvConf]
if len(nameservers) < 1 || resolvBindMount == "" || len(c.config.NetNsCtr) > 0 {
return nil
}
// write and return
return resolvconf.Add(resolvBindMount, nameservers)
}
// Initialize a container, creating it in the runtime
func (c *Container) init(ctx context.Context, retainRetries bool) error {
// Unconditionally remove conmon temporary files.
// We've been running into far too many issues where they block startup.
if err := c.removeConmonFiles(); err != nil {
return err
}
// Generate the OCI newSpec
newSpec, err := c.generateSpec(ctx)
if err != nil {
return err
}
// Make sure the workdir exists while initializing container
if err := c.resolveWorkDir(); err != nil {
return err
}
// Save the OCI newSpec to disk
if err := c.saveSpec(newSpec); err != nil {
return err
}
for _, v := range c.config.NamedVolumes {
if err := c.fixVolumePermissions(v); err != nil {
return err
}
}
// With the spec complete, do an OCI create
if _, err = c.ociRuntime.CreateContainer(c, nil); err != nil {
return err
}
logrus.Debugf("Created container %s in OCI runtime", c.ID())
// Remove any exec sessions leftover from a potential prior run.
if len(c.state.ExecSessions) > 0 {
if err := c.runtime.state.RemoveContainerExecSessions(c); err != nil {
logrus.Errorf("Removing container %s exec sessions from DB: %v", c.ID(), err)
}
c.state.ExecSessions = make(map[string]*ExecSession)
}
c.state.Checkpointed = false
c.state.Restored = false
c.state.CheckpointedTime = time.Time{}
c.state.RestoredTime = time.Time{}
c.state.CheckpointPath = ""
c.state.CheckpointLog = ""
c.state.RestoreLog = ""
c.state.ExitCode = 0
c.state.Exited = false
c.state.State = define.ContainerStateCreated
c.state.StoppedByUser = false
c.state.RestartPolicyMatch = false
if !retainRetries {
c.state.RestartCount = 0
}
if err := c.save(); err != nil {
return err
}
if c.config.HealthCheckConfig != nil {
if err := c.createTimer(); err != nil {
logrus.Error(err)
}
}
defer c.newContainerEvent(events.Init)
return c.completeNetworkSetup()
}
// Clean up a container in the OCI runtime.
// Deletes the container in the runtime, and resets its state to Exited.
// The container can be restarted cleanly after this.
func (c *Container) cleanupRuntime(ctx context.Context) error {
// If the container is not ContainerStateStopped or
// ContainerStateCreated, do nothing.
if !c.ensureState(define.ContainerStateStopped, define.ContainerStateCreated) {
return nil
}
// If necessary, delete attach and ctl files
if err := c.removeConmonFiles(); err != nil {
return err
}
if err := c.delete(ctx); err != nil {
return err
}
// If we were Stopped, we are now Exited, as we've removed ourself
// from the runtime.
// If we were Created, we are now Configured.
if c.state.State == define.ContainerStateStopped {
c.state.State = define.ContainerStateExited
} else if c.state.State == define.ContainerStateCreated {
c.state.State = define.ContainerStateConfigured
}
if c.valid {
if err := c.save(); err != nil {
return err
}
}
logrus.Debugf("Successfully cleaned up container %s", c.ID())
return nil
}
// Reinitialize a container.
// Deletes and recreates a container in the runtime.
// Should only be done on ContainerStateStopped containers.
// Not necessary for ContainerStateExited - the container has already been
// removed from the runtime, so init() can proceed freely.
func (c *Container) reinit(ctx context.Context, retainRetries bool) error {
logrus.Debugf("Recreating container %s in OCI runtime", c.ID())
if err := c.cleanupRuntime(ctx); err != nil {
return err
}
// Initialize the container again
return c.init(ctx, retainRetries)
}
// Initialize (if necessary) and start a container
// Performs all necessary steps to start a container that is not running
// Does not lock or check validity
func (c *Container) initAndStart(ctx context.Context) (retErr error) {
// If we are ContainerStateUnknown, throw an error
if c.state.State == define.ContainerStateUnknown {
return errors.Wrapf(define.ErrCtrStateInvalid, "container %s is in an unknown state", c.ID())
} else if c.state.State == define.ContainerStateRemoving {
return errors.Wrapf(define.ErrCtrStateInvalid, "cannot start container %s as it is being removed", c.ID())
}
// If we are running, do nothing
if c.state.State == define.ContainerStateRunning {
return nil
}
// If we are paused, throw an error
if c.state.State == define.ContainerStatePaused {
return errors.Wrapf(define.ErrCtrStateInvalid, "cannot start paused container %s", c.ID())
}
defer func() {
if retErr != nil {
if err := c.cleanup(ctx); err != nil {
logrus.Errorf("Cleaning up container %s: %v", c.ID(), err)
}
}
}()
if err := c.prepare(); err != nil {
return err
}
// If we are ContainerStateStopped we need to remove from runtime
// And reset to ContainerStateConfigured
if c.state.State == define.ContainerStateStopped {
logrus.Debugf("Recreating container %s in OCI runtime", c.ID())
if err := c.reinit(ctx, false); err != nil {
return err
}
} else if c.ensureState(define.ContainerStateConfigured, define.ContainerStateExited) {
if err := c.init(ctx, false); err != nil {
return err
}
}
// Now start the container
return c.start()
}
// Internal, non-locking function to start a container
func (c *Container) start() error {
if c.config.Spec.Process != nil {
logrus.Debugf("Starting container %s with command %v", c.ID(), c.config.Spec.Process.Args)
}
if err := c.ociRuntime.StartContainer(c); err != nil {
return err
}
logrus.Debugf("Started container %s", c.ID())
c.state.State = define.ContainerStateRunning
if c.config.SdNotifyMode != define.SdNotifyModeIgnore {
payload := fmt.Sprintf("MAINPID=%d", c.state.ConmonPID)
if c.config.SdNotifyMode == define.SdNotifyModeConmon {
payload += "\n"
payload += daemon.SdNotifyReady
}
if sent, err := daemon.SdNotify(false, payload); err != nil {
logrus.Errorf("Notifying systemd of Conmon PID: %s", err.Error())
} else if sent {
logrus.Debugf("Notify sent successfully")
}
}
// Check if healthcheck is not nil and --no-healthcheck option is not set.
// If --no-healthcheck is set Test will be always set to `[NONE]` so no need
// to update status in such case.
if c.config.HealthCheckConfig != nil && !(len(c.config.HealthCheckConfig.Test) == 1 && c.config.HealthCheckConfig.Test[0] == "NONE") {
if err := c.updateHealthStatus(define.HealthCheckStarting); err != nil {
logrus.Error(err)
}
if err := c.startTimer(); err != nil {
logrus.Error(err)
}
}
defer c.newContainerEvent(events.Start)
return c.save()
}
// Internal, non-locking function to stop container
func (c *Container) stop(timeout uint) error {
logrus.Debugf("Stopping ctr %s (timeout %d)", c.ID(), timeout)
// If the container is running in a PID Namespace, then killing the
// primary pid is enough to kill the container. If it is not running in
// a pid namespace then the OCI Runtime needs to kill ALL processes in
// the containers cgroup in order to make sure the container is stopped.
all := !c.hasNamespace(spec.PIDNamespace)
// We can't use --all if Cgroups aren't present.
// Rootless containers with Cgroups v1 and NoCgroups are both cases
// where this can happen.
if all {
if c.config.NoCgroups {
all = false
} else if rootless.IsRootless() {
// Only do this check if we need to
unified, err := cgroups.IsCgroup2UnifiedMode()
if err != nil {
return err
}
if !unified {
all = false
}
}
}
// Set the container state to "stopping" and unlock the container
// before handing it over to conmon to unblock other commands. #8501
// demonstrates nicely that a high stop timeout will block even simple
// commands such as `podman ps` from progressing if the container lock
// is held when busy-waiting for the container to be stopped.
c.state.State = define.ContainerStateStopping
if err := c.save(); err != nil {
return errors.Wrapf(err, "error saving container %s state before stopping", c.ID())
}
if !c.batched {
c.lock.Unlock()
}
stopErr := c.ociRuntime.StopContainer(c, timeout, all)
if !c.batched {
c.lock.Lock()
if err := c.syncContainer(); err != nil {
switch errors.Cause(err) {
// If the container has already been removed (e.g., via
// the cleanup process), there's nothing left to do.
case define.ErrNoSuchCtr, define.ErrCtrRemoved:
return stopErr
default:
if stopErr != nil {
logrus.Errorf("Syncing container %s status: %v", c.ID(), err)
return stopErr
}
return err
}
}
}
// We have to check stopErr *after* we lock again - otherwise, we have a
// change of panicking on a double-unlock. Ref: GH Issue 9615
if stopErr != nil {
return stopErr
}
// Since we're now subject to a race condition with other processes who
// may have altered the state (and other data), let's check if the
// state has changed. If so, we should return immediately and log a
// warning.
if c.state.State != define.ContainerStateStopping {
logrus.Warnf(
"Container %q state changed from %q to %q while waiting for it to be stopped: discontinuing stop procedure as another process interfered",
c.ID(), define.ContainerStateStopping, c.state.State,
)
return nil
}
c.newContainerEvent(events.Stop)
c.state.StoppedByUser = true
conmonAlive, err := c.ociRuntime.CheckConmonRunning(c)
if err != nil {
return err
}
if !conmonAlive {
if err := c.checkExitFile(); err != nil {
return err
}
return c.save()
}
if err := c.save(); err != nil {
return errors.Wrapf(err, "error saving container %s state after stopping", c.ID())
}
// Wait until we have an exit file, and sync once we do
if err := c.waitForExitFileAndSync(); err != nil {
return err
}
return nil
}
// Internal, non-locking function to pause a container
func (c *Container) pause() error {
if c.config.NoCgroups {
return errors.Wrapf(define.ErrNoCgroups, "cannot pause without using Cgroups")
}
if rootless.IsRootless() {
cgroupv2, err := cgroups.IsCgroup2UnifiedMode()
if err != nil {
return errors.Wrap(err, "failed to determine cgroupversion")
}
if !cgroupv2 {
return errors.Wrap(define.ErrNoCgroups, "can not pause containers on rootless containers with cgroup V1")
}
}
if err := c.ociRuntime.PauseContainer(c); err != nil {
// TODO when using docker-py there is some sort of race/incompatibility here
return err
}
logrus.Debugf("Paused container %s", c.ID())
c.state.State = define.ContainerStatePaused
return c.save()
}
// Internal, non-locking function to unpause a container
func (c *Container) unpause() error {
if c.config.NoCgroups {
return errors.Wrapf(define.ErrNoCgroups, "cannot unpause without using Cgroups")
}
if err := c.ociRuntime.UnpauseContainer(c); err != nil {
// TODO when using docker-py there is some sort of race/incompatibility here
return err
}
logrus.Debugf("Unpaused container %s", c.ID())
c.state.State = define.ContainerStateRunning
return c.save()
}
// Internal, non-locking function to restart a container
func (c *Container) restartWithTimeout(ctx context.Context, timeout uint) (retErr error) {
if !c.ensureState(define.ContainerStateConfigured, define.ContainerStateCreated, define.ContainerStateRunning, define.ContainerStateStopped, define.ContainerStateExited) {
return errors.Wrapf(define.ErrCtrStateInvalid, "unable to restart a container in a paused or unknown state")
}
c.newContainerEvent(events.Restart)
if c.state.State == define.ContainerStateRunning {
conmonPID := c.state.ConmonPID
if err := c.stop(timeout); err != nil {
return err
}
// Old versions of conmon have a bug where they create the exit file before
// closing open file descriptors causing a race condition when restarting
// containers with open ports since we cannot bind the ports as they're not
// yet closed by conmon.
//
// Killing the old conmon PID is ~okay since it forces the FDs of old conmons
// to be closed, while it's a NOP for newer versions which should have
// exited already.
if conmonPID != 0 {
// Ignore errors from FindProcess() as conmon could already have exited.
p, err := os.FindProcess(conmonPID)
if p != nil && err == nil {
if err = p.Kill(); err != nil {
logrus.Debugf("error killing conmon process: %v", err)
}
}
}
// Ensure we tear down the container network so it will be
// recreated - otherwise, behavior of restart differs from stop
// and start
if err := c.cleanupNetwork(); err != nil {
return err
}
}
defer func() {
if retErr != nil {
if err := c.cleanup(ctx); err != nil {
logrus.Errorf("Cleaning up container %s: %v", c.ID(), err)
}
}
}()
if err := c.prepare(); err != nil {
return err
}
if c.state.State == define.ContainerStateStopped {
// Reinitialize the container if we need to
if err := c.reinit(ctx, false); err != nil {
return err
}
} else if c.state.State == define.ContainerStateConfigured ||
c.state.State == define.ContainerStateExited {
// Initialize the container
if err := c.init(ctx, false); err != nil {
return err
}
}
return c.start()
}
// mountStorage sets up the container's root filesystem
// It mounts the image and any other requested mounts
// TODO: Add ability to override mount label so we can use this for Mount() too
// TODO: Can we use this for export? Copying SHM into the export might not be
// good
func (c *Container) mountStorage() (_ string, deferredErr error) {
var err error
// Container already mounted, nothing to do
if c.state.Mounted {
return c.state.Mountpoint, nil
}
if !c.config.NoShm {
mounted, err := mount.Mounted(c.config.ShmDir)
if err != nil {
return "", errors.Wrapf(err, "unable to determine if %q is mounted", c.config.ShmDir)
}
if !mounted && !MountExists(c.config.Spec.Mounts, "/dev/shm") {
shmOptions := fmt.Sprintf("mode=1777,size=%d", c.config.ShmSize)
if err := c.mountSHM(shmOptions); err != nil {
return "", err
}
if err := os.Chown(c.config.ShmDir, c.RootUID(), c.RootGID()); err != nil {
return "", errors.Wrapf(err, "failed to chown %s", c.config.ShmDir)
}
defer func() {
if deferredErr != nil {
if err := c.unmountSHM(c.config.ShmDir); err != nil {
logrus.Errorf("Unmounting SHM for container %s after mount error: %v", c.ID(), err)
}
}
}()
}
}
// We need to mount the container before volumes - to ensure the copyup
// works properly.
mountPoint := c.config.Rootfs
// Check if overlay has to be created on top of Rootfs
if c.config.RootfsOverlay {
overlayDest := c.runtime.RunRoot()
contentDir, err := overlay.GenerateStructure(overlayDest, c.ID(), "rootfs", c.RootUID(), c.RootGID())
if err != nil {
return "", errors.Wrapf(err, "rootfs-overlay: failed to create TempDir in the %s directory", overlayDest)
}
overlayMount, err := overlay.Mount(contentDir, c.config.Rootfs, overlayDest, c.RootUID(), c.RootGID(), c.runtime.store.GraphOptions())
if err != nil {
return "", errors.Wrapf(err, "rootfs-overlay: creating overlay failed %q", c.config.Rootfs)
}
// Seems fuse-overlayfs is not present
// fallback to native overlay
if overlayMount.Type == "overlay" {
overlayMount.Options = append(overlayMount.Options, "nodev")
mountOpts := label.FormatMountLabel(strings.Join(overlayMount.Options, ","), c.MountLabel())
err = mount.Mount("overlay", overlayMount.Source, overlayMount.Type, mountOpts)
if err != nil {
return "", errors.Wrapf(err, "rootfs-overlay: creating overlay failed %q from native overlay", c.config.Rootfs)
}
}
mountPoint = overlayMount.Source
execUser, err := lookup.GetUserGroupInfo(mountPoint, c.config.User, nil)
if err != nil {
return "", err
}
hostUID, hostGID, err := butil.GetHostIDs(util.IDtoolsToRuntimeSpec(c.config.IDMappings.UIDMap), util.IDtoolsToRuntimeSpec(c.config.IDMappings.GIDMap), uint32(execUser.Uid), uint32(execUser.Gid))
if err != nil {
return "", errors.Wrap(err, "unable to get host UID and host GID")
}
//note: this should not be recursive, if using external rootfs users should be responsible on configuring ownership.
if err := chown.ChangeHostPathOwnership(mountPoint, false, int(hostUID), int(hostGID)); err != nil {
return "", err
}
}
if mountPoint == "" {
mountPoint, err = c.mount()
if err != nil {
return "", err
}
defer func() {
if deferredErr != nil {
if err := c.unmount(false); err != nil {
logrus.Errorf("Unmounting container %s after mount error: %v", c.ID(), err)
}
}
}()
}
rootUID, rootGID := c.RootUID(), c.RootGID()
dirfd, err := unix.Open(mountPoint, unix.O_RDONLY|unix.O_PATH, 0)
if err != nil {
return "", errors.Wrap(err, "open mount point")
}
defer unix.Close(dirfd)
err = unix.Mkdirat(dirfd, "etc", 0755)
if err != nil && !os.IsExist(err) {
return "", errors.Wrap(err, "create /etc")
}
// If the etc directory was created, chown it to root in the container
if err == nil && (rootUID != 0 || rootGID != 0) {
err = unix.Fchownat(dirfd, "etc", rootUID, rootGID, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
return "", errors.Wrap(err, "chown /etc")
}
}
etcInTheContainerPath, err := securejoin.SecureJoin(mountPoint, "etc")
if err != nil {
return "", errors.Wrap(err, "resolve /etc in the container")
}
etcInTheContainerFd, err := unix.Open(etcInTheContainerPath, unix.O_RDONLY|unix.O_PATH, 0)
if err != nil {
return "", errors.Wrap(err, "open /etc in the container")
}
defer unix.Close(etcInTheContainerFd)
// If /etc/mtab does not exist in container image, then we need to
// create it, so that mount command within the container will work.
err = unix.Symlinkat("/proc/mounts", etcInTheContainerFd, "mtab")
if err != nil && !os.IsExist(err) {
return "", errors.Wrap(err, "creating /etc/mtab symlink")
}
// If the symlink was created, then also chown it to root in the container
if err == nil && (rootUID != 0 || rootGID != 0) {
err = unix.Fchownat(etcInTheContainerFd, "mtab", rootUID, rootGID, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
return "", errors.Wrap(err, "chown /etc/mtab")
}
}
// Request a mount of all named volumes
for _, v := range c.config.NamedVolumes {
vol, err := c.mountNamedVolume(v, mountPoint)
if err != nil {
return "", err
}
defer func() {
if deferredErr == nil {
return
}
vol.lock.Lock()
if err := vol.unmount(false); err != nil {
logrus.Errorf("Unmounting volume %s after error mounting container %s: %v", vol.Name(), c.ID(), err)
}
vol.lock.Unlock()
}()
}
return mountPoint, nil
}
// Mount a single named volume into the container.
// If necessary, copy up image contents into the volume.
// Does not verify that the name volume given is actually present in container
// config.
// Returns the volume that was mounted.
func (c *Container) mountNamedVolume(v *ContainerNamedVolume, mountpoint string) (*Volume, error) {
logrus.Debugf("Going to mount named volume %s", v.Name)
vol, err := c.runtime.state.Volume(v.Name)
if err != nil {
return nil, errors.Wrapf(err, "error retrieving named volume %s for container %s", v.Name, c.ID())
}
if vol.config.LockID == c.config.LockID {
return nil, errors.Wrapf(define.ErrWillDeadlock, "container %s and volume %s share lock ID %d", c.ID(), vol.Name(), c.config.LockID)
}
vol.lock.Lock()
defer vol.lock.Unlock()
if vol.needsMount() {
if err := vol.mount(); err != nil {
return nil, errors.Wrapf(err, "error mounting volume %s for container %s", vol.Name(), c.ID())
}
}
// The volume may need a copy-up. Check the state.
if err := vol.update(); err != nil {
return nil, err
}
_, hasNoCopy := vol.config.Options["nocopy"]
if vol.state.NeedsCopyUp && !cutil.StringInSlice("nocopy", v.Options) && !hasNoCopy {
logrus.Debugf("Copying up contents from container %s to volume %s", c.ID(), vol.Name())
srcDir, err := securejoin.SecureJoin(mountpoint, v.Dest)
if err != nil {
return nil, errors.Wrapf(err, "error calculating destination path to copy up container %s volume %s", c.ID(), vol.Name())
}
// Do a manual stat on the source directory to verify existence.
// Skip the rest if it exists.
srcStat, err := os.Lstat(srcDir)
if err != nil {
if os.IsNotExist(err) {
// Source does not exist, don't bother copying
// up.
return vol, nil
}
return nil, errors.Wrapf(err, "error identifying source directory for copy up into volume %s", vol.Name())
}
// If it's not a directory we're mounting over it.
if !srcStat.IsDir() {
return vol, nil
}
// Read contents, do not bother continuing if it's empty. Fixes
// a bizarre issue where something copier.Get will ENOENT on
// empty directories and sometimes it will not.
// RHBZ#1928643
srcContents, err := ioutil.ReadDir(srcDir)
if err != nil {
return nil, errors.Wrapf(err, "error reading contents of source directory for copy up into volume %s", vol.Name())
}
if len(srcContents) == 0 {
return vol, nil
}
// If the volume is not empty, we should not copy up.
volMount := vol.mountPoint()
contents, err := ioutil.ReadDir(volMount)
if err != nil {
return nil, errors.Wrapf(err, "error listing contents of volume %s mountpoint when copying up from container %s", vol.Name(), c.ID())
}
if len(contents) > 0 {
// The volume is not empty. It was likely modified
// outside of Podman. For safety, let's not copy up into
// it. Fixes CVE-2020-1726.
return vol, nil
}
// Set NeedsCopyUp to false since we are about to do first copy
// Do not copy second time.
vol.state.NeedsCopyUp = false
if err := vol.save(); err != nil {
return nil, err
}
// Buildah Copier accepts a reader, so we'll need a pipe.
reader, writer := io.Pipe()
defer reader.Close()
errChan := make(chan error, 1)
logrus.Infof("About to copy up into volume %s", vol.Name())
// Copy, container side: get a tar archive of what needs to be
// streamed into the volume.
go func() {
defer writer.Close()
getOptions := copier.GetOptions{
KeepDirectoryNames: false,
}
errChan <- copier.Get(srcDir, "", getOptions, []string{"/."}, writer)
}()
// Copy, volume side: stream what we've written to the pipe, into
// the volume.
copyOpts := copier.PutOptions{}
if err := copier.Put(volMount, "", copyOpts, reader); err != nil {
err2 := <-errChan
if err2 != nil {
logrus.Errorf("Streaming contents of container %s directory for volume copy-up: %v", c.ID(), err2)
}
return nil, errors.Wrapf(err, "error copying up to volume %s", vol.Name())
}
if err := <-errChan; err != nil {
return nil, errors.Wrapf(err, "error streaming container content for copy up into volume %s", vol.Name())
}
}
return vol, nil
}
// cleanupStorage unmounts and cleans up the container's root filesystem
func (c *Container) cleanupStorage() error {
if !c.state.Mounted {
// Already unmounted, do nothing
logrus.Debugf("Container %s storage is already unmounted, skipping...", c.ID())
return nil
}
var cleanupErr error
markUnmounted := func() {
c.state.Mountpoint = ""
c.state.Mounted = false
if c.valid {
if err := c.save(); err != nil {
if cleanupErr != nil {
logrus.Errorf("Unmounting container %s: %v", c.ID(), cleanupErr)
}
cleanupErr = err
}
}
}
// umount rootfs overlay if it was created
if c.config.RootfsOverlay {
overlayBasePath := filepath.Dir(c.state.Mountpoint)
if err := overlay.Unmount(overlayBasePath); err != nil {
if cleanupErr != nil {
logrus.Errorf("Failed to clean up overlay mounts for %s: %v", c.ID(), err)
}
cleanupErr = err
}
}
for _, containerMount := range c.config.Mounts {
if err := c.unmountSHM(containerMount); err != nil {
if cleanupErr != nil {
logrus.Errorf("Unmounting container %s: %v", c.ID(), cleanupErr)
}
cleanupErr = err
}
}
if err := c.cleanupOverlayMounts(); err != nil {
// If the container can't remove content report the error
logrus.Errorf("Failed to clean up overlay mounts for %s: %v", c.ID(), err)
cleanupErr = err
}
if c.config.Rootfs != "" {
markUnmounted()
return cleanupErr
}
if err := c.unmount(false); err != nil {
// If the container has already been removed, warn but don't
// error
// We still want to be able to kick the container out of the
// state
if errors.Cause(err) == storage.ErrNotAContainer || errors.Cause(err) == storage.ErrContainerUnknown || errors.Cause(err) == storage.ErrLayerNotMounted {
logrus.Errorf("Storage for container %s has been removed", c.ID())
} else {
if cleanupErr != nil {
logrus.Errorf("Cleaning up container %s storage: %v", c.ID(), cleanupErr)
}
cleanupErr = err
}
}
// Request an unmount of all named volumes
for _, v := range c.config.NamedVolumes {
vol, err := c.runtime.state.Volume(v.Name)
if err != nil {
if cleanupErr != nil {
logrus.Errorf("Unmounting container %s: %v", c.ID(), cleanupErr)
}
cleanupErr = errors.Wrapf(err, "error retrieving named volume %s for container %s", v.Name, c.ID())
// We need to try and unmount every volume, so continue
// if they fail.
continue
}
if vol.needsMount() {
vol.lock.Lock()
if err := vol.unmount(false); err != nil {
if cleanupErr != nil {
logrus.Errorf("Unmounting container %s: %v", c.ID(), cleanupErr)
}
cleanupErr = errors.Wrapf(err, "error unmounting volume %s for container %s", vol.Name(), c.ID())
}
vol.lock.Unlock()
}
}
markUnmounted()
return cleanupErr
}
// Unmount the container and free its resources
func (c *Container) cleanup(ctx context.Context) error {
var lastError error
logrus.Debugf("Cleaning up container %s", c.ID())
// Remove healthcheck unit/timer file if it execs
if c.config.HealthCheckConfig != nil {
if err := c.removeTransientFiles(ctx); err != nil {
logrus.Errorf("Removing timer for container %s healthcheck: %v", c.ID(), err)
}
}
// Clean up network namespace, if present
if err := c.cleanupNetwork(); err != nil {
lastError = errors.Wrapf(err, "error removing container %s network", c.ID())
}
// cleanup host entry if it is shared
if c.config.NetNsCtr != "" {
if hoststFile, ok := c.state.BindMounts[config.DefaultHostsFile]; ok {
if _, err := os.Stat(hoststFile); err == nil {
// we cannot use the dependency container lock due ABBA deadlocks
if lock, err := lockfile.GetLockfile(hoststFile); err == nil {
lock.Lock()
// make sure to ignore ENOENT error in case the netns container was cleaned up before this one
if err := etchosts.Remove(hoststFile, getLocalhostHostEntry(c)); err != nil && !errors.Is(err, os.ErrNotExist) {
// this error is not fatal we still want to do proper cleanup
logrus.Errorf("failed to remove hosts entry from the netns containers /etc/hosts: %v", err)
}
lock.Unlock()
}
}
}
}
// Remove the container from the runtime, if necessary.
// Do this *before* unmounting storage - some runtimes (e.g. Kata)
// apparently object to having storage removed while the container still
// exists.
if err := c.cleanupRuntime(ctx); err != nil {
if lastError != nil {
logrus.Errorf("Removing container %s from OCI runtime: %v", c.ID(), err)
} else {
lastError = err
}
}
// Unmount storage
if err := c.cleanupStorage(); err != nil {
if lastError != nil {
logrus.Errorf("Unmounting container %s storage: %v", c.ID(), err)
} else {
lastError = errors.Wrapf(err, "error unmounting container %s storage", c.ID())
}
}
// Unmount image volumes
for _, v := range c.config.ImageVolumes {
img, _, err := c.runtime.LibimageRuntime().LookupImage(v.Source, nil)
if err != nil {
if lastError == nil {
lastError = err
continue
}
logrus.Errorf("Unmounting image volume %q:%q :%v", v.Source, v.Dest, err)
}
if err := img.Unmount(false); err != nil {
if lastError == nil {
lastError = err
continue
}
logrus.Errorf("Unmounting image volume %q:%q :%v", v.Source, v.Dest, err)
}
}
if err := c.stopPodIfNeeded(context.Background()); err != nil {
if lastError == nil {
lastError = err
} else {
logrus.Errorf("Stopping pod of container %s: %v", c.ID(), err)
}
}
// Prune the exit codes of other container during clean up.
// Since Podman is no daemon, we have to clean them up somewhere.
// Cleanup seems like a good place as it's not performance
// critical.
if err := c.runtime.state.PruneContainerExitCodes(); err != nil {
if lastError == nil {
lastError = err
} else {
logrus.Errorf("Pruning container exit codes: %v", err)
}
}
return lastError
}
// If the container is part of a pod where only the infra container remains
// running, attempt to stop the pod.
func (c *Container) stopPodIfNeeded(ctx context.Context) error {
if c.config.Pod == "" {
return nil
}
pod, err := c.runtime.state.Pod(c.config.Pod)
if err != nil {
return fmt.Errorf("container %s is in pod %s, but pod cannot be retrieved: %w", c.ID(), c.config.Pod, err)
}
switch pod.config.ExitPolicy {
case config.PodExitPolicyContinue:
return nil
case config.PodExitPolicyStop:
// Use the runtime's work queue to stop the pod. This resolves
// a number of scenarios where we'd otherwise run into
// deadlocks. For instance, during `pod stop`, the pod has
// already been locked.
// The work queue is a simple means without having to worry about
// future changes that may introduce more deadlock scenarios.
c.runtime.queueWork(func() {
if err := pod.stopIfOnlyInfraRemains(ctx, c.ID()); err != nil {
if !errors.Is(err, define.ErrNoSuchPod) {
logrus.Errorf("Checking if infra needs to be stopped: %v", err)
}
}
})
}
return nil
}
// delete deletes the container and runs any configured poststop
// hooks.
func (c *Container) delete(ctx context.Context) error {
if err := c.ociRuntime.DeleteContainer(c); err != nil {
return errors.Wrapf(err, "error removing container %s from runtime", c.ID())
}
if err := c.postDeleteHooks(ctx); err != nil {
return errors.Wrapf(err, "container %s poststop hooks", c.ID())
}
return nil
}
// postDeleteHooks runs the poststop hooks (if any) as specified by
// the OCI Runtime Specification (which requires them to run
// post-delete, despite the stage name).
func (c *Container) postDeleteHooks(ctx context.Context) error {
if c.state.ExtensionStageHooks != nil {
extensionHooks, ok := c.state.ExtensionStageHooks["poststop"]
if ok {
state, err := json.Marshal(spec.State{
Version: spec.Version,
ID: c.ID(),
Status: "stopped",
Bundle: c.bundlePath(),
Annotations: c.config.Spec.Annotations,
})
if err != nil {
return err
}
for i, hook := range extensionHooks {
hook := hook
logrus.Debugf("container %s: invoke poststop hook %d, path %s", c.ID(), i, hook.Path)
var stderr, stdout bytes.Buffer
hookErr, err := exec.Run(ctx, &hook, state, &stdout, &stderr, exec.DefaultPostKillTimeout)
if err != nil {
logrus.Warnf("Container %s: poststop hook %d: %v", c.ID(), i, err)
if hookErr != err {
logrus.Debugf("container %s: poststop hook %d (hook error): %v", c.ID(), i, hookErr)
}
stdoutString := stdout.String()
if stdoutString != "" {
logrus.Debugf("container %s: poststop hook %d: stdout:\n%s", c.ID(), i, stdoutString)
}
stderrString := stderr.String()
if stderrString != "" {
logrus.Debugf("container %s: poststop hook %d: stderr:\n%s", c.ID(), i, stderrString)
}
}
}
}
}
return nil
}
// writeStringToRundir writes the given string to a file with the given name in
// the container's temporary files directory. The file will be chown'd to the
// container's root user and have an appropriate SELinux label set.
// If a file with the same name already exists, it will be deleted and recreated
// with the new contents.
// Returns the full path to the new file.
func (c *Container) writeStringToRundir(destFile, contents string) (string, error) {
destFileName := filepath.Join(c.state.RunDir, destFile)
if err := os.Remove(destFileName); err != nil && !os.IsNotExist(err) {
return "", errors.Wrapf(err, "error removing %s for container %s", destFile, c.ID())
}
if err := writeStringToPath(destFileName, contents, c.config.MountLabel, c.RootUID(), c.RootGID()); err != nil {
return "", err
}
return destFileName, nil
}
// writeStringToStaticDir writes the given string to a file with the given name
// in the container's permanent files directory. The file will be chown'd to the
// container's root user and have an appropriate SELinux label set.
// Unlike writeStringToRundir, will *not* delete and re-create if the file
// already exists (will instead error).
// Returns the full path to the new file.
func (c *Container) writeStringToStaticDir(filename, contents string) (string, error) {
destFileName := filepath.Join(c.config.StaticDir, filename)
if err := writeStringToPath(destFileName, contents, c.config.MountLabel, c.RootUID(), c.RootGID()); err != nil {
return "", err
}
return destFileName, nil
}
// saveSpec saves the OCI spec to disk, replacing any existing specs for the container
func (c *Container) saveSpec(spec *spec.Spec) error {
// If the OCI spec already exists, we need to replace it
// Cannot guarantee some things, e.g. network namespaces, have the same
// paths
jsonPath := filepath.Join(c.bundlePath(), "config.json")
if _, err := os.Stat(jsonPath); err != nil {
if !os.IsNotExist(err) {
return errors.Wrapf(err, "error doing stat on container %s spec", c.ID())
}
// The spec does not exist, we're fine
} else {
// The spec exists, need to remove it
if err := os.Remove(jsonPath); err != nil {
return errors.Wrapf(err, "error replacing runtime spec for container %s", c.ID())
}
}
fileJSON, err := json.Marshal(spec)
if err != nil {
return errors.Wrapf(err, "error exporting runtime spec for container %s to JSON", c.ID())
}
if err := ioutil.WriteFile(jsonPath, fileJSON, 0644); err != nil {
return errors.Wrapf(err, "error writing runtime spec JSON for container %s to disk", c.ID())
}
logrus.Debugf("Created OCI spec for container %s at %s", c.ID(), jsonPath)
c.state.ConfigPath = jsonPath
return nil
}
// Warning: precreate hooks may alter 'config' in place.
func (c *Container) setupOCIHooks(ctx context.Context, config *spec.Spec) (map[string][]spec.Hook, error) {
allHooks := make(map[string][]spec.Hook)
if c.runtime.config.Engine.HooksDir == nil {
if rootless.IsRootless() {
return nil, nil
}
for _, hDir := range []string{hooks.DefaultDir, hooks.OverrideDir} {
manager, err := hooks.New(ctx, []string{hDir}, []string{"precreate", "poststop"})
if err != nil {
if os.IsNotExist(err) {
continue
}
return nil, err
}
ociHooks, err := manager.Hooks(config, c.config.Spec.Annotations, len(c.config.UserVolumes) > 0)
if err != nil {
return nil, err
}
if len(ociHooks) > 0 || config.Hooks != nil {
logrus.Warnf("Implicit hook directories are deprecated; set --ociHooks-dir=%q explicitly to continue to load ociHooks from this directory", hDir)
}
for i, hook := range ociHooks {
allHooks[i] = hook
}
}
} else {
manager, err := hooks.New(ctx, c.runtime.config.Engine.HooksDir, []string{"precreate", "poststop"})
if err != nil {
return nil, err
}
allHooks, err = manager.Hooks(config, c.config.Spec.Annotations, len(c.config.UserVolumes) > 0)
if err != nil {
return nil, err
}
}
hookErr, err := exec.RuntimeConfigFilter(ctx, allHooks["precreate"], config, exec.DefaultPostKillTimeout)
if err != nil {
logrus.Warnf("Container %s: precreate hook: %v", c.ID(), err)
if hookErr != nil && hookErr != err {
logrus.Debugf("container %s: precreate hook (hook error): %v", c.ID(), hookErr)
}
return nil, err
}
return allHooks, nil
}
// mount mounts the container's root filesystem
func (c *Container) mount() (string, error) {
if c.state.State == define.ContainerStateRemoving {
return "", errors.Wrapf(define.ErrCtrStateInvalid, "cannot mount container %s as it is being removed", c.ID())
}
mountPoint, err := c.runtime.storageService.MountContainerImage(c.ID())
if err != nil {
return "", errors.Wrapf(err, "error mounting storage for container %s", c.ID())
}
mountPoint, err = filepath.EvalSymlinks(mountPoint)
if err != nil {
return "", errors.Wrapf(err, "error resolving storage path for container %s", c.ID())
}
if err := os.Chown(mountPoint, c.RootUID(), c.RootGID()); err != nil {
return "", errors.Wrapf(err, "cannot chown %s to %d:%d", mountPoint, c.RootUID(), c.RootGID())
}
return mountPoint, nil
}
// unmount unmounts the container's root filesystem
func (c *Container) unmount(force bool) error {
// Also unmount storage
if _, err := c.runtime.storageService.UnmountContainerImage(c.ID(), force); err != nil {
return errors.Wrapf(err, "error unmounting container %s root filesystem", c.ID())
}
return nil
}
// checkReadyForRemoval checks whether the given container is ready to be
// removed.
// These checks are only used if force-remove is not specified.
// If it is, we'll remove the container anyways.
// Returns nil if safe to remove, or an error describing why it's unsafe if not.
func (c *Container) checkReadyForRemoval() error {
if c.state.State == define.ContainerStateUnknown {
return errors.Wrapf(define.ErrCtrStateInvalid, "container %s is in invalid state", c.ID())
}
if c.ensureState(define.ContainerStateRunning, define.ContainerStatePaused) && !c.IsInfra() {
return errors.Wrapf(define.ErrCtrStateInvalid, "cannot remove container %s as it is %s - running or paused containers cannot be removed without force", c.ID(), c.state.State.String())
}
// Check exec sessions
sessions, err := c.getActiveExecSessions()
if err != nil {
return err
}
if len(sessions) != 0 {
return errors.Wrapf(define.ErrCtrStateInvalid, "cannot remove container %s as it has active exec sessions", c.ID())
}
return nil
}
// canWithPrevious return the stat of the preCheckPoint dir
func (c *Container) canWithPrevious() error {
_, err := os.Stat(c.PreCheckPointPath())
return err
}
// prepareCheckpointExport writes the config and spec to
// JSON files for later export
func (c *Container) prepareCheckpointExport() error {
networks, err := c.networks()
if err != nil {
return err
}
// make sure to exclude the short ID alias since the container gets a new ID on restore
for net, opts := range networks {
newAliases := make([]string, 0, len(opts.Aliases))
for _, alias := range opts.Aliases {
if alias != c.config.ID[:12] {
newAliases = append(newAliases, alias)
}
}
opts.Aliases = newAliases
networks[net] = opts
}
// add the networks from the db to the config so that the exported checkpoint still stores all current networks
c.config.Networks = networks
// save live config
if _, err := metadata.WriteJSONFile(c.config, c.bundlePath(), metadata.ConfigDumpFile); err != nil {
return err
}
// save spec
jsonPath := filepath.Join(c.bundlePath(), "config.json")
g, err := generate.NewFromFile(jsonPath)
if err != nil {
logrus.Debugf("generating spec for container %q failed with %v", c.ID(), err)
return err
}
if _, err := metadata.WriteJSONFile(g.Config, c.bundlePath(), metadata.SpecDumpFile); err != nil {
return err
}
return nil
}
// SortUserVolumes sorts the volumes specified for a container
// between named and normal volumes
func (c *Container) SortUserVolumes(ctrSpec *spec.Spec) ([]*ContainerNamedVolume, []spec.Mount) {
namedUserVolumes := []*ContainerNamedVolume{}
userMounts := []spec.Mount{}
// We need to parse all named volumes and mounts into maps, so we don't
// end up with repeated lookups for each user volume.
// Map destination to struct, as destination is what is stored in
// UserVolumes.
namedVolumes := make(map[string]*ContainerNamedVolume)
mounts := make(map[string]spec.Mount)
for _, namedVol := range c.config.NamedVolumes {
namedVolumes[namedVol.Dest] = namedVol
}
for _, mount := range ctrSpec.Mounts {
mounts[mount.Destination] = mount
}
for _, vol := range c.config.UserVolumes {
if volume, ok := namedVolumes[vol]; ok {
namedUserVolumes = append(namedUserVolumes, volume)
} else if mount, ok := mounts[vol]; ok {
userMounts = append(userMounts, mount)
} else {
logrus.Warnf("Could not find mount at destination %q when parsing user volumes for container %s", vol, c.ID())
}
}
return namedUserVolumes, userMounts
}
// Check for an exit file, and handle one if present
func (c *Container) checkExitFile() error {
// If the container's not running, nothing to do.
if !c.ensureState(define.ContainerStateRunning, define.ContainerStatePaused, define.ContainerStateStopping) {
return nil
}
exitFile, err := c.exitFilePath()
if err != nil {
return err
}
// Check for the exit file
info, err := os.Stat(exitFile)
if err != nil {
if os.IsNotExist(err) {
// Container is still running, no error
return nil
}
return errors.Wrapf(err, "error running stat on container %s exit file", c.ID())
}
// Alright, it exists. Transition to Stopped state.
c.state.State = define.ContainerStateStopped
c.state.PID = 0
c.state.ConmonPID = 0
// Read the exit file to get our stopped time and exit code.
return c.handleExitFile(exitFile, info)
}
func (c *Container) hasNamespace(namespace spec.LinuxNamespaceType) bool {
if c.config.Spec == nil || c.config.Spec.Linux == nil {
return false
}
for _, n := range c.config.Spec.Linux.Namespaces {
if n.Type == namespace {
return true
}
}
return false
}
// extractSecretToStorage copies a secret's data from the secrets manager to the container's static dir
func (c *Container) extractSecretToCtrStorage(secr *ContainerSecret) error {
manager, err := c.runtime.SecretsManager()
if err != nil {
return err
}
_, data, err := manager.LookupSecretData(secr.Name)
if err != nil {
return err
}
secretFile := filepath.Join(c.config.SecretsPath, secr.Name)
hostUID, hostGID, err := butil.GetHostIDs(util.IDtoolsToRuntimeSpec(c.config.IDMappings.UIDMap), util.IDtoolsToRuntimeSpec(c.config.IDMappings.GIDMap), secr.UID, secr.GID)
if err != nil {
return errors.Wrap(err, "unable to extract secret")
}
err = ioutil.WriteFile(secretFile, data, 0644)
if err != nil {
return errors.Wrapf(err, "unable to create %s", secretFile)
}
if err := os.Lchown(secretFile, int(hostUID), int(hostGID)); err != nil {
return err
}
if err := os.Chmod(secretFile, os.FileMode(secr.Mode)); err != nil {
return err
}
if err := label.Relabel(secretFile, c.config.MountLabel, false); err != nil {
return err
}
return nil
}
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