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|
package libpod
import (
"bytes"
"context"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/containers/libpod/libpod/events"
"github.com/containers/libpod/pkg/ctime"
"github.com/containers/libpod/pkg/hooks"
"github.com/containers/libpod/pkg/hooks/exec"
"github.com/containers/libpod/pkg/rootless"
"github.com/containers/storage"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/mount"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/opencontainers/runtime-tools/generate"
"github.com/opencontainers/selinux/go-selinux/label"
opentracing "github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
const (
// name of the directory holding the artifacts
artifactsDir = "artifacts"
)
// 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 != "" {
var size int64
err := filepath.Walk(c.config.Rootfs, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
size += info.Size()
return nil
})
return size, err
}
container, err := c.runtime.store.Container(c.ID())
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. The top layer of a container is
// the only RW layer, all others are immutable
layer, err := c.runtime.store.Layer(container.LayerID)
if err != nil {
return 0, err
}
return c.runtime.store.DiffSize(layer.Parent, layer.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")
}
// CheckpointPath returns the path to the directory containing the checkpoint
func (c *Container) CheckpointPath() string {
return filepath.Join(c.bundlePath(), "checkpoint")
}
// AttachSocketPath retrieves the path of the container's attach socket
func (c *Container) AttachSocketPath() string {
return filepath.Join(c.ociRuntime.socketsDir, c.ID(), "attach")
}
// Get PID file path for a container's exec session
func (c *Container) execPidPath(sessionID string) string {
return filepath.Join(c.state.RunDir, "exec_pid_"+sessionID)
}
// exitFilePath gets the path to the container's exit file
func (c *Container) exitFilePath() string {
return filepath.Join(c.ociRuntime.exitsDir, c.ID())
}
// Wait for the container's exit file to appear.
// When it does, update our state based on it.
func (c *Container) waitForExitFileAndSync() error {
exitFile := c.exitFilePath()
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 = ContainerStateStopped
if err2 := c.save(); err2 != nil {
logrus.Errorf("Error saving container %s state: %v", c.ID(), err2)
}
return err
}
if err := c.ociRuntime.updateContainerStatus(c, false); 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 nil
}
// 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) (restarted bool, err error) {
// If we did not get a restart policy match, exit immediately.
// Do the same if we're not a policy that restarts.
if !c.state.RestartPolicyMatch ||
c.config.RestartPolicy == RestartPolicyNo ||
c.config.RestartPolicy == RestartPolicyNone {
return false, nil
}
// If we're RestartPolicyOnFailure, we need to check retries and exit
// code.
if c.config.RestartPolicy == RestartPolicyOnFailure {
if c.state.ExitCode == 0 {
return false, nil
}
// If we don't have a max retries set, continue
if c.config.RestartRetries > 0 {
if c.state.RestartCount < c.config.RestartRetries {
logrus.Debugf("Container %s restart policy trigger: on retry %d (of %d)",
c.ID(), c.state.RestartCount, c.config.RestartRetries)
} else {
logrus.Debugf("Container %s restart policy trigger: retries exhausted", c.ID())
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(ctx); err != nil {
return false, err
}
// Is the container running again?
// If so, we don't have to do anything
if c.state.State == ContainerStateRunning || c.state.State == ContainerStatePaused {
return false, nil
} else if c.state.State == ContainerStateUnknown {
return false, errors.Wrapf(ErrInternal, "invalid container state encountered in restart attempt!")
}
c.newContainerEvent(events.Restart)
// Increment restart count
c.state.RestartCount = c.state.RestartCount + 1
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 err != nil {
if err2 := c.cleanup(ctx); err2 != nil {
logrus.Errorf("error cleaning up container %s: %v", c.ID(), err2)
}
}
}()
if err := c.prepare(); err != nil {
return false, err
}
if c.state.State == ContainerStateStopped {
// Reinitialize the container if we need to
if err := c.reinit(ctx, true); err != nil {
return false, err
}
} else if c.state.State == ContainerStateConfigured ||
c.state.State == 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
}
// 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.state.State != ContainerStateUnknown) &&
(c.state.State != ContainerStateConfigured) &&
(c.state.State != ContainerStateExited) {
oldState := c.state.State
// TODO: optionally replace this with a stat for the exit file
if err := c.ociRuntime.updateContainerStatus(c, false); 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 != RestartPolicyNone && c.config.RestartPolicy != RestartPolicyNo &&
(oldState == ContainerStateRunning || oldState == ContainerStatePaused) &&
(c.state.State == ContainerStateStopped || c.state.State == ContainerStateExited) &&
!c.state.StoppedByUser {
c.state.RestartPolicyMatch = true
}
if err := c.save(); err != nil {
return err
}
}
}
if !c.valid {
return errors.Wrapf(ErrCtrRemoved, "container %s is not valid", c.ID())
}
return nil
}
// Create container root filesystem for use
func (c *Container) setupStorage(ctx context.Context) error {
span, _ := opentracing.StartSpanFromContext(ctx, "setupStorage")
span.SetTag("type", "container")
defer span.Finish()
if !c.valid {
return errors.Wrapf(ErrCtrRemoved, "container %s is not valid", c.ID())
}
if c.state.State != ContainerStateConfigured {
return errors.Wrapf(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(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,
}
if c.restoreFromCheckpoint {
// If restoring from a checkpoint, the root file-system
// needs to be mounted with the same SELinux labels as
// it was mounted previously.
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
}
if c.config.Rootfs == "" {
options.IDMappingOptions = c.config.IDMappings
}
containerInfo, err := c.runtime.storageService.CreateContainerStorage(ctx, c.runtime.imageContext, c.config.RootfsImageName, c.config.RootfsImageID, c.config.Name, c.config.ID, options)
if err != nil {
return errors.Wrapf(err, "error creating container storage")
}
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
}
}
c.config.ProcessLabel = containerInfo.ProcessLabel
c.config.MountLabel = containerInfo.MountLabel
c.config.StaticDir = containerInfo.Dir
c.state.RunDir = containerInfo.RunDir
// Set the default Entrypoint and Command
if containerInfo.Config != nil {
if c.config.Entrypoint == nil {
c.config.Entrypoint = containerInfo.Config.Config.Entrypoint
}
if c.config.Command == nil {
c.config.Command = containerInfo.Config.Config.Cmd
}
}
artifacts := filepath.Join(c.config.StaticDir, artifactsDir)
if err := os.MkdirAll(artifacts, 0755); err != nil {
return errors.Wrapf(err, "error creating artifacts directory %q", artifacts)
}
return nil
}
// Tear down a container's storage prior to removal
func (c *Container) teardownStorage() error {
if c.state.State == ContainerStateRunning || c.state.State == ContainerStatePaused {
return errors.Wrapf(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 cleanup 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 err == storage.ErrNotAContainer || err == storage.ErrContainerUnknown {
logrus.Warnf("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) error {
state.PID = 0
state.Mountpoint = ""
state.Mounted = false
if state.State != ContainerStateExited {
state.State = ContainerStateConfigured
}
state.ExecSessions = make(map[string]*ExecSession)
state.NetworkStatus = nil
state.BindMounts = make(map[string]string)
state.StoppedByUser = false
state.RestartPolicyMatch = false
state.RestartCount = 0
return nil
}
// 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(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.TmpDir)
if err != nil {
return errors.Wrapf(err, "cannot stat `%s`", c.runtime.config.TmpDir)
}
if err := os.Chmod(c.runtime.config.TmpDir, info.Mode()|0111); err != nil {
return errors.Wrapf(err, "cannot chmod `%s`", c.runtime.config.TmpDir)
}
root := filepath.Join(c.runtime.config.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
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 := filepath.Join(c.bundlePath(), "attach")
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())
}
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())
}
// Instead of outright deleting the exit file, rename it (if it exists).
// We want to retain it so we can get the exit code of containers which
// are removed (at least until we have a workable events system)
exitFile := filepath.Join(c.ociRuntime.exitsDir, c.ID())
oldExitFile := filepath.Join(c.ociRuntime.exitsDir, fmt.Sprintf("%s-old", c.ID()))
if _, err := os.Stat(exitFile); err != nil {
if !os.IsNotExist(err) {
return errors.Wrapf(err, "error running stat on container %s exit file", c.ID())
}
} else if err == nil {
// Rename should replace the old exit file (if it exists)
if err := os.Rename(exitFile, oldExitFile); err != nil {
return errors.Wrapf(err, "error renaming container %s exit file", c.ID())
}
}
return nil
}
func (c *Container) export(path string) error {
mountPoint := c.state.Mountpoint
if !c.state.Mounted {
mount, err := c.runtime.store.Mount(c.ID(), c.config.MountLabel)
if err != nil {
return errors.Wrapf(err, "error mounting container %q", c.ID())
}
mountPoint = mount
defer func() {
if _, err := c.runtime.store.Unmount(c.ID(), false); err != nil {
logrus.Errorf("error 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)
}
// Used with Wait() to determine if a container has exited
func (c *Container) isStopped() (bool, error) {
if !c.batched {
c.lock.Lock()
defer c.lock.Unlock()
}
err := c.syncContainer()
if err != nil {
return true, err
}
return (c.state.State != ContainerStateRunning && c.state.State != ContainerStatePaused), nil
}
// 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) (err error) {
// Container must be created or stopped to be started
if !(c.state.State == ContainerStateConfigured ||
c.state.State == ContainerStateCreated ||
c.state.State == ContainerStateStopped ||
c.state.State == ContainerStateExited) {
return errors.Wrapf(ErrCtrStateInvalid, "container %s must be in Created or Stopped state to be started", c.ID())
}
if !recursive {
if err := c.checkDependenciesAndHandleError(ctx); err != nil {
return err
}
} else {
if err := c.startDependencies(ctx); err != nil {
return err
}
}
defer func() {
if err != nil {
if err2 := c.cleanup(ctx); err2 != nil {
logrus.Errorf("error cleaning up container %s: %v", c.ID(), err2)
}
}
}()
if err := c.prepare(); err != nil {
return err
}
if c.state.State == ContainerStateStopped {
// Reinitialize the container if we need to
if err := c.reinit(ctx, false); err != nil {
return err
}
} else if c.state.State == ContainerStateConfigured ||
c.state.State == 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(ctx context.Context) 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(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(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("error starting some container dependencies")
for _, e := range ctrErrors {
logrus.Errorf("%q", e)
}
return errors.Wrapf(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 visisted (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 propegate 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 != 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 != ContainerStateRunning {
notRunning = append(notRunning, dep)
}
depCtrs[dep] = depCtr
}
return notRunning, nil
}
// Check if a container's dependencies are running
// Returns a []string containing the IDs of dependencies that are not running
// Assumes depencies are already locked, and will be passed in
// Accepts a map[string]*Container containing, at a minimum, the locked
// dependency containers
// (This must be a map from container ID to container)
func (c *Container) checkDependenciesRunningLocked(depCtrs map[string]*Container) ([]string, error) {
deps := c.Dependencies()
notRunning := []string{}
for _, dep := range deps {
depCtr, ok := depCtrs[dep]
if !ok {
return nil, errors.Wrapf(ErrNoSuchCtr, "container %s depends on container %s but it is not on containers passed to checkDependenciesRunning", c.ID(), dep)
}
if err := c.syncContainer(); err != nil {
return nil, err
}
if depCtr.state.State != ContainerStateRunning {
notRunning = append(notRunning, dep)
}
}
return notRunning, nil
}
func (c *Container) completeNetworkSetup() error {
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 c.config.NetMode == "slirp4netns" {
return c.runtime.setupRootlessNetNS(c)
}
return c.runtime.setupNetNS(c)
}
// Initialize a container, creating it in the runtime
func (c *Container) init(ctx context.Context, retainRetries bool) error {
span, _ := opentracing.StartSpanFromContext(ctx, "init")
span.SetTag("struct", "container")
defer span.Finish()
// Generate the OCI spec
spec, err := c.generateSpec(ctx)
if err != nil {
return err
}
// Save the OCI spec to disk
if err := c.saveSpec(spec); err != nil {
return err
}
// With the spec complete, do an OCI create
if err := c.ociRuntime.createContainer(c, c.config.CgroupParent, nil); err != nil {
return err
}
logrus.Debugf("Created container %s in OCI runtime", c.ID())
c.state.ExitCode = 0
c.state.Exited = false
c.state.State = 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 {
span, _ := opentracing.StartSpanFromContext(ctx, "cleanupRuntime")
span.SetTag("struct", "container")
defer span.Finish()
// If the container is not ContainerStateStopped or
// ContainerStateCreated, do nothing.
if c.state.State != ContainerStateStopped && c.state.State != 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 == ContainerStateStopped {
c.state.State = ContainerStateExited
} else if c.state.State == ContainerStateCreated {
c.state.State = 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 {
span, _ := opentracing.StartSpanFromContext(ctx, "reinit")
span.SetTag("struct", "container")
defer span.Finish()
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) (err error) {
// If we are ContainerStateUnknown, throw an error
if c.state.State == ContainerStateUnknown {
return errors.Wrapf(ErrCtrStateInvalid, "container %s is in an unknown state", c.ID())
}
// If we are running, do nothing
if c.state.State == ContainerStateRunning {
return nil
}
// If we are paused, throw an error
if c.state.State == ContainerStatePaused {
return errors.Wrapf(ErrCtrStateInvalid, "cannot start paused container %s", c.ID())
}
defer func() {
if err != nil {
if err2 := c.cleanup(ctx); err2 != nil {
logrus.Errorf("error cleaning up container %s: %v", c.ID(), err2)
}
}
}()
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 == ContainerStateStopped {
logrus.Debugf("Recreating container %s in OCI runtime", c.ID())
if err := c.reinit(ctx, false); err != nil {
return err
}
} else if c.state.State == ContainerStateConfigured ||
c.state.State == 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 = ContainerStateRunning
if c.config.HealthCheckConfig != nil {
if err := c.updateHealthStatus(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 err := c.ociRuntime.stopContainer(c, timeout); err != nil {
return err
}
c.state.StoppedByUser = true
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
return c.waitForExitFileAndSync()
}
// Internal, non-locking function to pause a container
func (c *Container) pause() error {
if err := c.ociRuntime.pauseContainer(c); err != nil {
return err
}
logrus.Debugf("Paused container %s", c.ID())
c.state.State = ContainerStatePaused
return c.save()
}
// Internal, non-locking function to unpause a container
func (c *Container) unpause() error {
if err := c.ociRuntime.unpauseContainer(c); err != nil {
return err
}
logrus.Debugf("Unpaused container %s", c.ID())
c.state.State = ContainerStateRunning
return c.save()
}
// Internal, non-locking function to restart a container
func (c *Container) restartWithTimeout(ctx context.Context, timeout uint) (err error) {
if c.state.State == ContainerStateUnknown || c.state.State == ContainerStatePaused {
return errors.Wrapf(ErrCtrStateInvalid, "unable to restart a container in a paused or unknown state")
}
c.newContainerEvent(events.Restart)
if c.state.State == ContainerStateRunning {
if err := c.stop(timeout); err != nil {
return err
}
}
defer func() {
if err != nil {
if err2 := c.cleanup(ctx); err2 != nil {
logrus.Errorf("error cleaning up container %s: %v", c.ID(), err2)
}
}
}()
if err := c.prepare(); err != nil {
return err
}
if c.state.State == ContainerStateStopped {
// Reinitialize the container if we need to
if err := c.reinit(ctx, false); err != nil {
return err
}
} else if c.state.State == ContainerStateConfigured ||
c.state.State == 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, error) {
var err error
// Container already mounted, nothing to do
if c.state.Mounted {
return c.state.Mountpoint, nil
}
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)
}
}
// TODO: generalize this mount code so it will mount every mount in ctr.config.Mounts
mountPoint := c.config.Rootfs
if mountPoint == "" {
mountPoint, err = c.mount()
if err != nil {
return "", err
}
}
return mountPoint, 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
}
for _, mount := range c.config.Mounts {
if err := c.unmountSHM(mount); err != nil {
return err
}
}
if c.config.Rootfs != "" {
return nil
}
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 {
logrus.Errorf("Storage for container %s has been removed", c.ID())
return nil
}
return err
}
c.state.Mountpoint = ""
c.state.Mounted = false
if c.valid {
return c.save()
}
return nil
}
// Unmount the a container and free its resources
func (c *Container) cleanup(ctx context.Context) error {
var lastError error
span, _ := opentracing.StartSpanFromContext(ctx, "cleanup")
span.SetTag("struct", "container")
defer span.Finish()
logrus.Debugf("Cleaning up container %s", c.ID())
// Remove healthcheck unit/timer file if it execs
if c.config.HealthCheckConfig != nil {
if err := c.removeTimer(); err != nil {
logrus.Errorf("Error 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())
}
// Unmount storage
if err := c.cleanupStorage(); err != nil {
if lastError != nil {
logrus.Errorf("Error unmounting container %s storage: %v", c.ID(), err)
} else {
lastError = errors.Wrapf(err, "error unmounting container %s storage", c.ID())
}
}
// Remove the container from the runtime, if necessary
if err := c.cleanupRuntime(ctx); err != nil {
if lastError != nil {
logrus.Errorf("Error removing container %s from OCI runtime: %v", c.ID(), err)
} else {
lastError = err
}
}
return lastError
}
// delete deletes the container and runs any configured poststop
// hooks.
func (c *Container) delete(ctx context.Context) (err error) {
span, _ := opentracing.StartSpanFromContext(ctx, "delete")
span.SetTag("struct", "container")
defer span.Finish()
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) (err error) {
span, _ := opentracing.StartSpanFromContext(ctx, "postDeleteHooks")
span.SetTag("struct", "container")
defer span.Finish()
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 {
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 copies the provided file to the runtimedir
func (c *Container) writeStringToRundir(destFile, output 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())
}
f, err := os.Create(destFileName)
if err != nil {
return "", errors.Wrapf(err, "unable to create %s", destFileName)
}
defer f.Close()
if err := f.Chown(c.RootUID(), c.RootGID()); err != nil {
return "", err
}
if _, err := f.WriteString(output); err != nil {
return "", errors.Wrapf(err, "unable to write %s", destFileName)
}
// Relabel runDirResolv for the container
if err := label.Relabel(destFileName, c.config.MountLabel, false); err != nil {
return "", err
}
return filepath.Join(c.state.RunDir, destFile), nil
}
// appendStringToRundir appends the provided string to the runtimedir file
func (c *Container) appendStringToRundir(destFile, output string) (string, error) {
destFileName := filepath.Join(c.state.RunDir, destFile)
f, err := os.OpenFile(destFileName, os.O_APPEND|os.O_WRONLY, 0600)
if err != nil {
return "", errors.Wrapf(err, "unable to open %s", destFileName)
}
defer f.Close()
if _, err := f.WriteString(output); err != nil {
return "", errors.Wrapf(err, "unable to write %s", destFileName)
}
return filepath.Join(c.state.RunDir, destFile), 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) (extensionStageHooks map[string][]spec.Hook, err error) {
allHooks := make(map[string][]spec.Hook)
if c.runtime.config.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
}
hooks, err := manager.Hooks(config, c.Spec().Annotations, len(c.config.UserVolumes) > 0)
if err != nil {
return nil, err
}
if len(hooks) > 0 || config.Hooks != nil {
logrus.Warnf("implicit hook directories are deprecated; set --hooks-dir=%q explicitly to continue to load hooks from this directory", hDir)
}
for i, hook := range hooks {
allHooks[i] = hook
}
}
} else {
manager, err := hooks.New(ctx, c.runtime.config.HooksDir, []string{"precreate", "poststop"})
if err != nil {
if os.IsNotExist(err) {
logrus.Warnf("Requested OCI hooks directory %q does not exist", c.runtime.config.HooksDir)
return nil, nil
}
return nil, err
}
allHooks, err = manager.Hooks(config, c.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) {
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
}
// getExcludedCGroups returns a string slice of cgroups we want to exclude
// because runc or other components are unaware of them.
func getExcludedCGroups() (excludes []string) {
excludes = []string{"rdma"}
return
}
// this should be from chrootarchive.
func (c *Container) copyWithTarFromImage(src, dest string) error {
mountpoint, err := c.mount()
if err != nil {
return err
}
a := archive.NewDefaultArchiver()
source := filepath.Join(mountpoint, src)
if err = c.copyOwnerAndPerms(source, dest); err != nil {
return err
}
return a.CopyWithTar(source, dest)
}
// 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 == ContainerStateUnknown {
return errors.Wrapf(ErrCtrStateInvalid, "container %s is in invalid state", c.ID())
}
if c.state.State == ContainerStateRunning ||
c.state.State == ContainerStatePaused {
return errors.Wrapf(ErrCtrStateInvalid, "cannot remove container %s as it is %s - running or paused containers cannot be removed", c.ID(), c.state.State.String())
}
if len(c.state.ExecSessions) != 0 {
return errors.Wrapf(ErrCtrStateInvalid, "cannot remove container %s as it has active exec sessions", c.ID())
}
return nil
}
// writeJSONFile marshalls and writes the given data to a JSON file
// in the bundle path
func (c *Container) writeJSONFile(v interface{}, file string) (err error) {
fileJSON, err := json.MarshalIndent(v, "", " ")
if err != nil {
return errors.Wrapf(err, "error writing JSON to %s for container %s", file, c.ID())
}
file = filepath.Join(c.bundlePath(), file)
if err := ioutil.WriteFile(file, fileJSON, 0644); err != nil {
return err
}
return nil
}
// prepareCheckpointExport writes the config and spec to
// JSON files for later export
func (c *Container) prepareCheckpointExport() (err error) {
// save live config
if err := c.writeJSONFile(c.Config(), "config.dump"); 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 := c.writeJSONFile(g.Spec(), "spec.dump"); err != nil {
return err
}
return nil
}
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