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|
//go:build linux
// +build linux
package libpod
import (
"bufio"
"bytes"
"context"
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"os"
"os/exec"
"path/filepath"
"runtime"
"strconv"
"strings"
"sync"
"syscall"
"text/template"
"time"
runcconfig "github.com/opencontainers/runc/libcontainer/configs"
"github.com/opencontainers/runc/libcontainer/devices"
"github.com/containers/common/pkg/cgroups"
"github.com/containers/common/pkg/config"
"github.com/containers/common/pkg/resize"
cutil "github.com/containers/common/pkg/util"
conmonConfig "github.com/containers/conmon/runner/config"
"github.com/containers/podman/v4/libpod/define"
"github.com/containers/podman/v4/libpod/logs"
"github.com/containers/podman/v4/pkg/checkpoint/crutils"
"github.com/containers/podman/v4/pkg/errorhandling"
"github.com/containers/podman/v4/pkg/rootless"
"github.com/containers/podman/v4/pkg/specgenutil"
"github.com/containers/podman/v4/pkg/util"
"github.com/containers/podman/v4/utils"
"github.com/containers/storage/pkg/homedir"
pmount "github.com/containers/storage/pkg/mount"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/opencontainers/selinux/go-selinux/label"
"github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
)
const (
// This is Conmon's STDIO_BUF_SIZE. I don't believe we have access to it
// directly from the Go code, so const it here
// Important: The conmon attach socket uses an extra byte at the beginning of each
// message to specify the STREAM so we have to increase the buffer size by one
bufferSize = conmonConfig.BufSize + 1
)
// ConmonOCIRuntime is an OCI runtime managed by Conmon.
// TODO: Make all calls to OCI runtime have a timeout.
type ConmonOCIRuntime struct {
name string
path string
conmonPath string
conmonEnv []string
tmpDir string
exitsDir string
logSizeMax int64
noPivot bool
reservePorts bool
runtimeFlags []string
supportsJSON bool
supportsKVM bool
supportsNoCgroups bool
enableKeyring bool
}
// Make a new Conmon-based OCI runtime with the given options.
// Conmon will wrap the given OCI runtime, which can be `runc`, `crun`, or
// any runtime with a runc-compatible CLI.
// The first path that points to a valid executable will be used.
// Deliberately private. Someone should not be able to construct this outside of
// libpod.
func newConmonOCIRuntime(name string, paths []string, conmonPath string, runtimeFlags []string, runtimeCfg *config.Config) (OCIRuntime, error) {
if name == "" {
return nil, fmt.Errorf("the OCI runtime must be provided a non-empty name: %w", define.ErrInvalidArg)
}
// Make lookup tables for runtime support
supportsJSON := make(map[string]bool, len(runtimeCfg.Engine.RuntimeSupportsJSON))
supportsNoCgroups := make(map[string]bool, len(runtimeCfg.Engine.RuntimeSupportsNoCgroups))
supportsKVM := make(map[string]bool, len(runtimeCfg.Engine.RuntimeSupportsKVM))
for _, r := range runtimeCfg.Engine.RuntimeSupportsJSON {
supportsJSON[r] = true
}
for _, r := range runtimeCfg.Engine.RuntimeSupportsNoCgroups {
supportsNoCgroups[r] = true
}
for _, r := range runtimeCfg.Engine.RuntimeSupportsKVM {
supportsKVM[r] = true
}
runtime := new(ConmonOCIRuntime)
runtime.name = name
runtime.conmonPath = conmonPath
runtime.runtimeFlags = runtimeFlags
runtime.conmonEnv = runtimeCfg.Engine.ConmonEnvVars
runtime.tmpDir = runtimeCfg.Engine.TmpDir
runtime.logSizeMax = runtimeCfg.Containers.LogSizeMax
runtime.noPivot = runtimeCfg.Engine.NoPivotRoot
runtime.reservePorts = runtimeCfg.Engine.EnablePortReservation
runtime.enableKeyring = runtimeCfg.Containers.EnableKeyring
// TODO: probe OCI runtime for feature and enable automatically if
// available.
base := filepath.Base(name)
runtime.supportsJSON = supportsJSON[base]
runtime.supportsNoCgroups = supportsNoCgroups[base]
runtime.supportsKVM = supportsKVM[base]
foundPath := false
for _, path := range paths {
stat, err := os.Stat(path)
if err != nil {
if os.IsNotExist(err) {
continue
}
return nil, fmt.Errorf("cannot stat OCI runtime %s path: %w", name, err)
}
if !stat.Mode().IsRegular() {
continue
}
foundPath = true
logrus.Tracef("found runtime %q", runtime.path)
runtime.path = path
break
}
// Search the $PATH as last fallback
if !foundPath {
if foundRuntime, err := exec.LookPath(name); err == nil {
foundPath = true
runtime.path = foundRuntime
logrus.Debugf("using runtime %q from $PATH: %q", name, foundRuntime)
}
}
if !foundPath {
return nil, fmt.Errorf("no valid executable found for OCI runtime %s: %w", name, define.ErrInvalidArg)
}
runtime.exitsDir = filepath.Join(runtime.tmpDir, "exits")
// Create the exit files and attach sockets directories
if err := os.MkdirAll(runtime.exitsDir, 0750); err != nil {
// The directory is allowed to exist
if !os.IsExist(err) {
return nil, fmt.Errorf("error creating OCI runtime exit files directory: %w", err)
}
}
return runtime, nil
}
// Name returns the name of the runtime being wrapped by Conmon.
func (r *ConmonOCIRuntime) Name() string {
return r.name
}
// Path returns the path of the OCI runtime being wrapped by Conmon.
func (r *ConmonOCIRuntime) Path() string {
return r.path
}
// hasCurrentUserMapped checks whether the current user is mapped inside the container user namespace
func hasCurrentUserMapped(ctr *Container) bool {
if len(ctr.config.IDMappings.UIDMap) == 0 && len(ctr.config.IDMappings.GIDMap) == 0 {
return true
}
uid := os.Geteuid()
for _, m := range ctr.config.IDMappings.UIDMap {
if uid >= m.HostID && uid < m.HostID+m.Size {
return true
}
}
return false
}
// CreateContainer creates a container.
func (r *ConmonOCIRuntime) CreateContainer(ctr *Container, restoreOptions *ContainerCheckpointOptions) (int64, error) {
// always make the run dir accessible to the current user so that the PID files can be read without
// being in the rootless user namespace.
if err := makeAccessible(ctr.state.RunDir, 0, 0); err != nil {
return 0, err
}
if !hasCurrentUserMapped(ctr) {
for _, i := range []string{ctr.state.RunDir, ctr.runtime.config.Engine.TmpDir, ctr.config.StaticDir, ctr.state.Mountpoint, ctr.runtime.config.Engine.VolumePath} {
if err := makeAccessible(i, ctr.RootUID(), ctr.RootGID()); err != nil {
return 0, err
}
}
// if we are running a non privileged container, be sure to umount some kernel paths so they are not
// bind mounted inside the container at all.
if !ctr.config.Privileged && !rootless.IsRootless() {
type result struct {
restoreDuration int64
err error
}
ch := make(chan result)
go func() {
runtime.LockOSThread()
restoreDuration, err := func() (int64, error) {
fd, err := os.Open(fmt.Sprintf("/proc/%d/task/%d/ns/mnt", os.Getpid(), unix.Gettid()))
if err != nil {
return 0, err
}
defer errorhandling.CloseQuiet(fd)
// create a new mountns on the current thread
if err = unix.Unshare(unix.CLONE_NEWNS); err != nil {
return 0, err
}
defer func() {
if err := unix.Setns(int(fd.Fd()), unix.CLONE_NEWNS); err != nil {
logrus.Errorf("Unable to clone new namespace: %q", err)
}
}()
// don't spread our mounts around. We are setting only /sys to be slave
// so that the cleanup process is still able to umount the storage and the
// changes are propagated to the host.
err = unix.Mount("/sys", "/sys", "none", unix.MS_REC|unix.MS_SLAVE, "")
if err != nil {
return 0, fmt.Errorf("cannot make /sys slave: %w", err)
}
mounts, err := pmount.GetMounts()
if err != nil {
return 0, err
}
for _, m := range mounts {
if !strings.HasPrefix(m.Mountpoint, "/sys/kernel") {
continue
}
err = unix.Unmount(m.Mountpoint, 0)
if err != nil && !os.IsNotExist(err) {
return 0, fmt.Errorf("cannot unmount %s: %w", m.Mountpoint, err)
}
}
return r.createOCIContainer(ctr, restoreOptions)
}()
ch <- result{
restoreDuration: restoreDuration,
err: err,
}
}()
r := <-ch
return r.restoreDuration, r.err
}
}
return r.createOCIContainer(ctr, restoreOptions)
}
// UpdateContainerStatus retrieves the current status of the container from the
// runtime. It updates the container's state but does not save it.
// If useRuntime is false, we will not directly hit runc to see the container's
// status, but will instead only check for the existence of the conmon exit file
// and update state to stopped if it exists.
func (r *ConmonOCIRuntime) UpdateContainerStatus(ctr *Container) error {
runtimeDir, err := util.GetRuntimeDir()
if err != nil {
return err
}
// Store old state so we know if we were already stopped
oldState := ctr.state.State
state := new(spec.State)
cmd := exec.Command(r.path, "state", ctr.ID())
cmd.Env = append(cmd.Env, fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir))
outPipe, err := cmd.StdoutPipe()
if err != nil {
return fmt.Errorf("getting stdout pipe: %w", err)
}
errPipe, err := cmd.StderrPipe()
if err != nil {
return fmt.Errorf("getting stderr pipe: %w", err)
}
if err := cmd.Start(); err != nil {
out, err2 := ioutil.ReadAll(errPipe)
if err2 != nil {
return fmt.Errorf("error getting container %s state: %w", ctr.ID(), err)
}
if strings.Contains(string(out), "does not exist") || strings.Contains(string(out), "No such file") {
if err := ctr.removeConmonFiles(); err != nil {
logrus.Debugf("unable to remove conmon files for container %s", ctr.ID())
}
ctr.state.ExitCode = -1
ctr.state.FinishedTime = time.Now()
ctr.state.State = define.ContainerStateExited
return ctr.runtime.state.AddContainerExitCode(ctr.ID(), ctr.state.ExitCode)
}
return fmt.Errorf("error getting container %s state. stderr/out: %s: %w", ctr.ID(), out, err)
}
defer func() {
_ = cmd.Wait()
}()
if err := errPipe.Close(); err != nil {
return err
}
out, err := ioutil.ReadAll(outPipe)
if err != nil {
return fmt.Errorf("error reading stdout: %s: %w", ctr.ID(), err)
}
if err := json.NewDecoder(bytes.NewBuffer(out)).Decode(state); err != nil {
return fmt.Errorf("error decoding container status for container %s: %w", ctr.ID(), err)
}
ctr.state.PID = state.Pid
switch state.Status {
case "created":
ctr.state.State = define.ContainerStateCreated
case "paused":
ctr.state.State = define.ContainerStatePaused
case "running":
ctr.state.State = define.ContainerStateRunning
case "stopped":
ctr.state.State = define.ContainerStateStopped
default:
return fmt.Errorf("unrecognized status returned by runtime for container %s: %s: %w",
ctr.ID(), state.Status, define.ErrInternal)
}
// Only grab exit status if we were not already stopped
// If we were, it should already be in the database
if ctr.state.State == define.ContainerStateStopped && oldState != define.ContainerStateStopped {
if _, err := ctr.Wait(context.Background()); err != nil {
logrus.Errorf("Waiting for container %s to exit: %v", ctr.ID(), err)
}
return nil
}
// Handle ContainerStateStopping - keep it unless the container
// transitioned to no longer running.
if oldState == define.ContainerStateStopping && (ctr.state.State == define.ContainerStatePaused || ctr.state.State == define.ContainerStateRunning) {
ctr.state.State = define.ContainerStateStopping
}
return nil
}
// StartContainer starts the given container.
// Sets time the container was started, but does not save it.
func (r *ConmonOCIRuntime) StartContainer(ctr *Container) error {
// TODO: streams should probably *not* be our STDIN/OUT/ERR - redirect to buffers?
runtimeDir, err := util.GetRuntimeDir()
if err != nil {
return err
}
env := []string{fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir)}
if path, ok := os.LookupEnv("PATH"); ok {
env = append(env, fmt.Sprintf("PATH=%s", path))
}
if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, append(r.runtimeFlags, "start", ctr.ID())...); err != nil {
return err
}
ctr.state.StartedTime = time.Now()
return nil
}
// KillContainer sends the given signal to the given container.
// If all is set, send to all PIDs in the container.
// All is only supported if the container created cgroups.
func (r *ConmonOCIRuntime) KillContainer(ctr *Container, signal uint, all bool) error {
logrus.Debugf("Sending signal %d to container %s", signal, ctr.ID())
runtimeDir, err := util.GetRuntimeDir()
if err != nil {
return err
}
env := []string{fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir)}
var args []string
args = append(args, r.runtimeFlags...)
if all {
args = append(args, "kill", "--all", ctr.ID(), fmt.Sprintf("%d", signal))
} else {
args = append(args, "kill", ctr.ID(), fmt.Sprintf("%d", signal))
}
if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, args...); err != nil {
// Update container state - there's a chance we failed because
// the container exited in the meantime.
if err2 := r.UpdateContainerStatus(ctr); err2 != nil {
logrus.Infof("Error updating status for container %s: %v", ctr.ID(), err2)
}
if ctr.ensureState(define.ContainerStateStopped, define.ContainerStateExited) {
return define.ErrCtrStateInvalid
}
return fmt.Errorf("error sending signal to container %s: %w", ctr.ID(), err)
}
return nil
}
// StopContainer stops a container, first using its given stop signal (or
// SIGTERM if no signal was specified), then using SIGKILL.
// Timeout is given in seconds. If timeout is 0, the container will be
// immediately kill with SIGKILL.
// Does not set finished time for container, assumes you will run updateStatus
// after to pull the exit code.
func (r *ConmonOCIRuntime) StopContainer(ctr *Container, timeout uint, all bool) error {
logrus.Debugf("Stopping container %s (PID %d)", ctr.ID(), ctr.state.PID)
// Ping the container to see if it's alive
// If it's not, it's already stopped, return
err := unix.Kill(ctr.state.PID, 0)
if err == unix.ESRCH {
return nil
}
stopSignal := ctr.config.StopSignal
if stopSignal == 0 {
stopSignal = uint(syscall.SIGTERM)
}
if timeout > 0 {
if err := r.KillContainer(ctr, stopSignal, all); err != nil {
// Is the container gone?
// If so, it probably died between the first check and
// our sending the signal
// The container is stopped, so exit cleanly
err := unix.Kill(ctr.state.PID, 0)
if err == unix.ESRCH {
return nil
}
return err
}
if err := waitContainerStop(ctr, time.Duration(timeout)*time.Second); err != nil {
logrus.Debugf("Timed out stopping container %s with %s, resorting to SIGKILL: %v", ctr.ID(), unix.SignalName(syscall.Signal(stopSignal)), err)
logrus.Warnf("StopSignal %s failed to stop container %s in %d seconds, resorting to SIGKILL", unix.SignalName(syscall.Signal(stopSignal)), ctr.Name(), timeout)
} else {
// No error, the container is dead
return nil
}
}
if err := r.KillContainer(ctr, 9, all); err != nil {
// Again, check if the container is gone. If it is, exit cleanly.
err := unix.Kill(ctr.state.PID, 0)
if err == unix.ESRCH {
return nil
}
return fmt.Errorf("error sending SIGKILL to container %s: %w", ctr.ID(), err)
}
// Give runtime a few seconds to make it happen
if err := waitContainerStop(ctr, killContainerTimeout); err != nil {
return err
}
return nil
}
// DeleteContainer deletes a container from the OCI runtime.
func (r *ConmonOCIRuntime) DeleteContainer(ctr *Container) error {
runtimeDir, err := util.GetRuntimeDir()
if err != nil {
return err
}
env := []string{fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir)}
return utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, append(r.runtimeFlags, "delete", "--force", ctr.ID())...)
}
// PauseContainer pauses the given container.
func (r *ConmonOCIRuntime) PauseContainer(ctr *Container) error {
runtimeDir, err := util.GetRuntimeDir()
if err != nil {
return err
}
env := []string{fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir)}
return utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, append(r.runtimeFlags, "pause", ctr.ID())...)
}
// UnpauseContainer unpauses the given container.
func (r *ConmonOCIRuntime) UnpauseContainer(ctr *Container) error {
runtimeDir, err := util.GetRuntimeDir()
if err != nil {
return err
}
env := []string{fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir)}
return utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, append(r.runtimeFlags, "resume", ctr.ID())...)
}
// HTTPAttach performs an attach for the HTTP API.
// The caller must handle closing the HTTP connection after this returns.
// The cancel channel is not closed; it is up to the caller to do so after
// this function returns.
// If this is a container with a terminal, we will stream raw. If it is not, we
// will stream with an 8-byte header to multiplex STDOUT and STDERR.
// Returns any errors that occurred, and whether the connection was successfully
// hijacked before that error occurred.
func (r *ConmonOCIRuntime) HTTPAttach(ctr *Container, req *http.Request, w http.ResponseWriter, streams *HTTPAttachStreams, detachKeys *string, cancel <-chan bool, hijackDone chan<- bool, streamAttach, streamLogs bool) (deferredErr error) {
isTerminal := false
if ctr.config.Spec.Process != nil {
isTerminal = ctr.config.Spec.Process.Terminal
}
if streams != nil {
if !streams.Stdin && !streams.Stdout && !streams.Stderr {
return fmt.Errorf("must specify at least one stream to attach to: %w", define.ErrInvalidArg)
}
}
attachSock, err := r.AttachSocketPath(ctr)
if err != nil {
return err
}
var conn *net.UnixConn
if streamAttach {
newConn, err := openUnixSocket(attachSock)
if err != nil {
return fmt.Errorf("failed to connect to container's attach socket: %v: %w", attachSock, err)
}
conn = newConn
defer func() {
if err := conn.Close(); err != nil {
logrus.Errorf("Unable to close container %s attach socket: %q", ctr.ID(), err)
}
}()
logrus.Debugf("Successfully connected to container %s attach socket %s", ctr.ID(), attachSock)
}
detachString := ctr.runtime.config.Engine.DetachKeys
if detachKeys != nil {
detachString = *detachKeys
}
detach, err := processDetachKeys(detachString)
if err != nil {
return err
}
attachStdout := true
attachStderr := true
attachStdin := true
if streams != nil {
attachStdout = streams.Stdout
attachStderr = streams.Stderr
attachStdin = streams.Stdin
}
logrus.Debugf("Going to hijack container %s attach connection", ctr.ID())
// Alright, let's hijack.
hijacker, ok := w.(http.Hijacker)
if !ok {
return fmt.Errorf("unable to hijack connection")
}
httpCon, httpBuf, err := hijacker.Hijack()
if err != nil {
return fmt.Errorf("error hijacking connection: %w", err)
}
hijackDone <- true
writeHijackHeader(req, httpBuf)
// Force a flush after the header is written.
if err := httpBuf.Flush(); err != nil {
return fmt.Errorf("error flushing HTTP hijack header: %w", err)
}
defer func() {
hijackWriteErrorAndClose(deferredErr, ctr.ID(), isTerminal, httpCon, httpBuf)
}()
logrus.Debugf("Hijack for container %s attach session done, ready to stream", ctr.ID())
// TODO: This is gross. Really, really gross.
// I want to say we should read all the logs into an array before
// calling this, in container_api.go, but that could take a lot of
// memory...
// On the whole, we need to figure out a better way of doing this,
// though.
logSize := 0
if streamLogs {
logrus.Debugf("Will stream logs for container %s attach session", ctr.ID())
// Get all logs for the container
logChan := make(chan *logs.LogLine)
logOpts := new(logs.LogOptions)
logOpts.Tail = -1
logOpts.WaitGroup = new(sync.WaitGroup)
errChan := make(chan error)
go func() {
var err error
// In non-terminal mode we need to prepend with the
// stream header.
logrus.Debugf("Writing logs for container %s to HTTP attach", ctr.ID())
for logLine := range logChan {
if !isTerminal {
device := logLine.Device
var header []byte
headerLen := uint32(len(logLine.Msg))
logSize += len(logLine.Msg)
switch strings.ToLower(device) {
case "stdin":
header = makeHTTPAttachHeader(0, headerLen)
case "stdout":
header = makeHTTPAttachHeader(1, headerLen)
case "stderr":
header = makeHTTPAttachHeader(2, headerLen)
default:
logrus.Errorf("Unknown device for log line: %s", device)
header = makeHTTPAttachHeader(1, headerLen)
}
_, err = httpBuf.Write(header)
if err != nil {
break
}
}
_, err = httpBuf.Write([]byte(logLine.Msg))
if err != nil {
break
}
if !logLine.Partial() {
_, err = httpBuf.Write([]byte("\n"))
if err != nil {
break
}
}
err = httpBuf.Flush()
if err != nil {
break
}
}
errChan <- err
}()
if err := ctr.ReadLog(context.Background(), logOpts, logChan, 0); err != nil {
return err
}
go func() {
logOpts.WaitGroup.Wait()
close(logChan)
}()
logrus.Debugf("Done reading logs for container %s, %d bytes", ctr.ID(), logSize)
if err := <-errChan; err != nil {
return err
}
}
if !streamAttach {
logrus.Debugf("Done streaming logs for container %s attach, exiting as attach streaming not requested", ctr.ID())
return nil
}
logrus.Debugf("Forwarding attach output for container %s", ctr.ID())
stdoutChan := make(chan error)
stdinChan := make(chan error)
// Handle STDOUT/STDERR
go func() {
var err error
if isTerminal {
// Hack: return immediately if attachStdout not set to
// emulate Docker.
// Basically, when terminal is set, STDERR goes nowhere.
// Everything does over STDOUT.
// Therefore, if not attaching STDOUT - we'll never copy
// anything from here.
logrus.Debugf("Performing terminal HTTP attach for container %s", ctr.ID())
if attachStdout {
err = httpAttachTerminalCopy(conn, httpBuf, ctr.ID())
}
} else {
logrus.Debugf("Performing non-terminal HTTP attach for container %s", ctr.ID())
err = httpAttachNonTerminalCopy(conn, httpBuf, ctr.ID(), attachStdin, attachStdout, attachStderr)
}
stdoutChan <- err
logrus.Debugf("STDOUT/ERR copy completed")
}()
// Next, STDIN. Avoid entirely if attachStdin unset.
if attachStdin {
go func() {
_, err := cutil.CopyDetachable(conn, httpBuf, detach)
logrus.Debugf("STDIN copy completed")
stdinChan <- err
}()
}
for {
select {
case err := <-stdoutChan:
if err != nil {
return err
}
return nil
case err := <-stdinChan:
if err != nil {
return err
}
// copy stdin is done, close it
if connErr := conn.CloseWrite(); connErr != nil {
logrus.Errorf("Unable to close conn: %v", connErr)
}
case <-cancel:
return nil
}
}
}
// isRetryable returns whether the error was caused by a blocked syscall or the
// specified operation on a non blocking file descriptor wasn't ready for completion.
func isRetryable(err error) bool {
var errno syscall.Errno
if errors.As(err, &errno) {
return errno == syscall.EINTR || errno == syscall.EAGAIN
}
return false
}
// openControlFile opens the terminal control file.
func openControlFile(ctr *Container, parentDir string) (*os.File, error) {
controlPath := filepath.Join(parentDir, "ctl")
for i := 0; i < 600; i++ {
controlFile, err := os.OpenFile(controlPath, unix.O_WRONLY|unix.O_NONBLOCK, 0)
if err == nil {
return controlFile, nil
}
if !isRetryable(err) {
return nil, fmt.Errorf("could not open ctl file for terminal resize for container %s: %w", ctr.ID(), err)
}
time.Sleep(time.Second / 10)
}
return nil, fmt.Errorf("timeout waiting for %q", controlPath)
}
// AttachResize resizes the terminal used by the given container.
func (r *ConmonOCIRuntime) AttachResize(ctr *Container, newSize resize.TerminalSize) error {
controlFile, err := openControlFile(ctr, ctr.bundlePath())
if err != nil {
return err
}
defer controlFile.Close()
logrus.Debugf("Received a resize event for container %s: %+v", ctr.ID(), newSize)
if _, err = fmt.Fprintf(controlFile, "%d %d %d\n", 1, newSize.Height, newSize.Width); err != nil {
return fmt.Errorf("failed to write to ctl file to resize terminal: %w", err)
}
return nil
}
// CheckpointContainer checkpoints the given container.
func (r *ConmonOCIRuntime) CheckpointContainer(ctr *Container, options ContainerCheckpointOptions) (int64, error) {
// imagePath is used by CRIU to store the actual checkpoint files
imagePath := ctr.CheckpointPath()
if options.PreCheckPoint {
imagePath = ctr.PreCheckPointPath()
}
// workPath will be used to store dump.log and stats-dump
workPath := ctr.bundlePath()
logrus.Debugf("Writing checkpoint to %s", imagePath)
logrus.Debugf("Writing checkpoint logs to %s", workPath)
logrus.Debugf("Pre-dump the container %t", options.PreCheckPoint)
args := []string{}
args = append(args, r.runtimeFlags...)
args = append(args, "checkpoint")
args = append(args, "--image-path")
args = append(args, imagePath)
args = append(args, "--work-path")
args = append(args, workPath)
if options.KeepRunning {
args = append(args, "--leave-running")
}
if options.TCPEstablished {
args = append(args, "--tcp-established")
}
if options.FileLocks {
args = append(args, "--file-locks")
}
if !options.PreCheckPoint && options.KeepRunning {
args = append(args, "--leave-running")
}
if options.PreCheckPoint {
args = append(args, "--pre-dump")
}
if !options.PreCheckPoint && options.WithPrevious {
args = append(
args,
"--parent-path",
filepath.Join("..", preCheckpointDir),
)
}
args = append(args, ctr.ID())
logrus.Debugf("the args to checkpoint: %s %s", r.path, strings.Join(args, " "))
runtimeDir, err := util.GetRuntimeDir()
if err != nil {
return 0, err
}
env := []string{fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir)}
if path, ok := os.LookupEnv("PATH"); ok {
env = append(env, fmt.Sprintf("PATH=%s", path))
}
runtime.LockOSThread()
if err := label.SetSocketLabel(ctr.ProcessLabel()); err != nil {
return 0, err
}
runtimeCheckpointStarted := time.Now()
err = utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, args...)
// Ignore error returned from SetSocketLabel("") call,
// can't recover.
if labelErr := label.SetSocketLabel(""); labelErr == nil {
// Unlock the thread only if the process label could be restored
// successfully. Otherwise leave the thread locked and the Go runtime
// will terminate it once it returns to the threads pool.
runtime.UnlockOSThread()
} else {
logrus.Errorf("Unable to reset socket label: %q", labelErr)
}
runtimeCheckpointDuration := func() int64 {
if options.PrintStats {
return time.Since(runtimeCheckpointStarted).Microseconds()
}
return 0
}()
return runtimeCheckpointDuration, err
}
func (r *ConmonOCIRuntime) CheckConmonRunning(ctr *Container) (bool, error) {
if ctr.state.ConmonPID == 0 {
// If the container is running or paused, assume Conmon is
// running. We didn't record Conmon PID on some old versions, so
// that is likely what's going on...
// Unusual enough that we should print a warning message though.
if ctr.ensureState(define.ContainerStateRunning, define.ContainerStatePaused) {
logrus.Warnf("Conmon PID is not set, but container is running!")
return true, nil
}
// Container's not running, so conmon PID being unset is
// expected. Conmon is not running.
return false, nil
}
// We have a conmon PID. Ping it with signal 0.
if err := unix.Kill(ctr.state.ConmonPID, 0); err != nil {
if err == unix.ESRCH {
return false, nil
}
return false, fmt.Errorf("error pinging container %s conmon with signal 0: %w", ctr.ID(), err)
}
return true, nil
}
// SupportsCheckpoint checks if the OCI runtime supports checkpointing
// containers.
func (r *ConmonOCIRuntime) SupportsCheckpoint() bool {
return crutils.CRRuntimeSupportsCheckpointRestore(r.path)
}
// SupportsJSONErrors checks if the OCI runtime supports JSON-formatted error
// messages.
func (r *ConmonOCIRuntime) SupportsJSONErrors() bool {
return r.supportsJSON
}
// SupportsNoCgroups checks if the OCI runtime supports running containers
// without cgroups (the --cgroup-manager=disabled flag).
func (r *ConmonOCIRuntime) SupportsNoCgroups() bool {
return r.supportsNoCgroups
}
// SupportsKVM checks if the OCI runtime supports running containers
// without KVM separation
func (r *ConmonOCIRuntime) SupportsKVM() bool {
return r.supportsKVM
}
// AttachSocketPath is the path to a single container's attach socket.
func (r *ConmonOCIRuntime) AttachSocketPath(ctr *Container) (string, error) {
if ctr == nil {
return "", fmt.Errorf("must provide a valid container to get attach socket path: %w", define.ErrInvalidArg)
}
return filepath.Join(ctr.bundlePath(), "attach"), nil
}
// ExitFilePath is the path to a container's exit file.
func (r *ConmonOCIRuntime) ExitFilePath(ctr *Container) (string, error) {
if ctr == nil {
return "", fmt.Errorf("must provide a valid container to get exit file path: %w", define.ErrInvalidArg)
}
return filepath.Join(r.exitsDir, ctr.ID()), nil
}
// RuntimeInfo provides information on the runtime.
func (r *ConmonOCIRuntime) RuntimeInfo() (*define.ConmonInfo, *define.OCIRuntimeInfo, error) {
runtimePackage := packageVersion(r.path)
conmonPackage := packageVersion(r.conmonPath)
runtimeVersion, err := r.getOCIRuntimeVersion()
if err != nil {
return nil, nil, fmt.Errorf("error getting version of OCI runtime %s: %w", r.name, err)
}
conmonVersion, err := r.getConmonVersion()
if err != nil {
return nil, nil, fmt.Errorf("error getting conmon version: %w", err)
}
conmon := define.ConmonInfo{
Package: conmonPackage,
Path: r.conmonPath,
Version: conmonVersion,
}
ocirt := define.OCIRuntimeInfo{
Name: r.name,
Path: r.path,
Package: runtimePackage,
Version: runtimeVersion,
}
return &conmon, &ocirt, nil
}
// makeAccessible changes the path permission and each parent directory to have --x--x--x
func makeAccessible(path string, uid, gid int) error {
for ; path != "/"; path = filepath.Dir(path) {
st, err := os.Stat(path)
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
if int(st.Sys().(*syscall.Stat_t).Uid) == uid && int(st.Sys().(*syscall.Stat_t).Gid) == gid {
continue
}
if st.Mode()&0111 != 0111 {
if err := os.Chmod(path, st.Mode()|0111); err != nil {
return err
}
}
}
return nil
}
// Wait for a container which has been sent a signal to stop
func waitContainerStop(ctr *Container, timeout time.Duration) error {
return waitPidStop(ctr.state.PID, timeout)
}
// Wait for a given PID to stop
func waitPidStop(pid int, timeout time.Duration) error {
done := make(chan struct{})
chControl := make(chan struct{})
go func() {
for {
select {
case <-chControl:
return
default:
if err := unix.Kill(pid, 0); err != nil {
if err == unix.ESRCH {
close(done)
return
}
logrus.Errorf("Pinging PID %d with signal 0: %v", pid, err)
}
time.Sleep(100 * time.Millisecond)
}
}
}()
select {
case <-done:
return nil
case <-time.After(timeout):
close(chControl)
return fmt.Errorf("given PIDs did not die within timeout")
}
}
func (r *ConmonOCIRuntime) getLogTag(ctr *Container) (string, error) {
logTag := ctr.LogTag()
if logTag == "" {
return "", nil
}
data, err := ctr.inspectLocked(false)
if err != nil {
// FIXME: this error should probably be returned
return "", nil //nolint: nilerr
}
tmpl, err := template.New("container").Parse(logTag)
if err != nil {
return "", fmt.Errorf("template parsing error %s: %w", logTag, err)
}
var b bytes.Buffer
err = tmpl.Execute(&b, data)
if err != nil {
return "", err
}
return b.String(), nil
}
// createOCIContainer generates this container's main conmon instance and prepares it for starting
func (r *ConmonOCIRuntime) createOCIContainer(ctr *Container, restoreOptions *ContainerCheckpointOptions) (int64, error) {
var stderrBuf bytes.Buffer
runtimeDir, err := util.GetRuntimeDir()
if err != nil {
return 0, err
}
parentSyncPipe, childSyncPipe, err := newPipe()
if err != nil {
return 0, fmt.Errorf("error creating socket pair: %w", err)
}
defer errorhandling.CloseQuiet(parentSyncPipe)
childStartPipe, parentStartPipe, err := newPipe()
if err != nil {
return 0, fmt.Errorf("error creating socket pair for start pipe: %w", err)
}
defer errorhandling.CloseQuiet(parentStartPipe)
var ociLog string
if logrus.GetLevel() != logrus.DebugLevel && r.supportsJSON {
ociLog = filepath.Join(ctr.state.RunDir, "oci-log")
}
logTag, err := r.getLogTag(ctr)
if err != nil {
return 0, err
}
if ctr.config.CgroupsMode == cgroupSplit {
if err := utils.MoveUnderCgroupSubtree("runtime"); err != nil {
return 0, err
}
}
pidfile := ctr.config.PidFile
if pidfile == "" {
pidfile = filepath.Join(ctr.state.RunDir, "pidfile")
}
args := r.sharedConmonArgs(ctr, ctr.ID(), ctr.bundlePath(), pidfile, ctr.LogPath(), r.exitsDir, ociLog, ctr.LogDriver(), logTag)
if ctr.config.SdNotifyMode == define.SdNotifyModeContainer && ctr.notifySocket != "" {
args = append(args, fmt.Sprintf("--sdnotify-socket=%s", ctr.notifySocket))
}
if ctr.config.Spec.Process.Terminal {
args = append(args, "-t")
} else if ctr.config.Stdin {
args = append(args, "-i")
}
if ctr.config.Timeout > 0 {
args = append(args, fmt.Sprintf("--timeout=%d", ctr.config.Timeout))
}
if !r.enableKeyring {
args = append(args, "--no-new-keyring")
}
if ctr.config.ConmonPidFile != "" {
args = append(args, "--conmon-pidfile", ctr.config.ConmonPidFile)
}
if r.noPivot {
args = append(args, "--no-pivot")
}
exitCommand, err := specgenutil.CreateExitCommandArgs(ctr.runtime.storageConfig, ctr.runtime.config, logrus.IsLevelEnabled(logrus.DebugLevel), ctr.AutoRemove(), false)
if err != nil {
return 0, err
}
exitCommand = append(exitCommand, ctr.config.ID)
args = append(args, "--exit-command", exitCommand[0])
for _, arg := range exitCommand[1:] {
args = append(args, []string{"--exit-command-arg", arg}...)
}
// Pass down the LISTEN_* environment (see #10443).
preserveFDs := ctr.config.PreserveFDs
if val := os.Getenv("LISTEN_FDS"); val != "" {
if ctr.config.PreserveFDs > 0 {
logrus.Warnf("Ignoring LISTEN_FDS to preserve custom user-specified FDs")
} else {
fds, err := strconv.Atoi(val)
if err != nil {
return 0, fmt.Errorf("converting LISTEN_FDS=%s: %w", val, err)
}
preserveFDs = uint(fds)
}
}
if preserveFDs > 0 {
args = append(args, formatRuntimeOpts("--preserve-fds", fmt.Sprintf("%d", preserveFDs))...)
}
if restoreOptions != nil {
args = append(args, "--restore", ctr.CheckpointPath())
if restoreOptions.TCPEstablished {
args = append(args, "--runtime-opt", "--tcp-established")
}
if restoreOptions.FileLocks {
args = append(args, "--runtime-opt", "--file-locks")
}
if restoreOptions.Pod != "" {
mountLabel := ctr.config.MountLabel
processLabel := ctr.config.ProcessLabel
if mountLabel != "" {
args = append(
args,
"--runtime-opt",
fmt.Sprintf(
"--lsm-mount-context=%s",
mountLabel,
),
)
}
if processLabel != "" {
args = append(
args,
"--runtime-opt",
fmt.Sprintf(
"--lsm-profile=selinux:%s",
processLabel,
),
)
}
}
}
logrus.WithFields(logrus.Fields{
"args": args,
}).Debugf("running conmon: %s", r.conmonPath)
cmd := exec.Command(r.conmonPath, args...)
cmd.SysProcAttr = &syscall.SysProcAttr{
Setpgid: true,
}
// TODO this is probably a really bad idea for some uses
// Make this configurable
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if ctr.config.Spec.Process.Terminal {
cmd.Stderr = &stderrBuf
}
// 0, 1 and 2 are stdin, stdout and stderr
conmonEnv := r.configureConmonEnv(runtimeDir)
var filesToClose []*os.File
if preserveFDs > 0 {
for fd := 3; fd < int(3+preserveFDs); fd++ {
f := os.NewFile(uintptr(fd), fmt.Sprintf("fd-%d", fd))
filesToClose = append(filesToClose, f)
cmd.ExtraFiles = append(cmd.ExtraFiles, f)
}
}
cmd.Env = r.conmonEnv
// we don't want to step on users fds they asked to preserve
// Since 0-2 are used for stdio, start the fds we pass in at preserveFDs+3
cmd.Env = append(cmd.Env, fmt.Sprintf("_OCI_SYNCPIPE=%d", preserveFDs+3), fmt.Sprintf("_OCI_STARTPIPE=%d", preserveFDs+4))
cmd.Env = append(cmd.Env, conmonEnv...)
cmd.ExtraFiles = append(cmd.ExtraFiles, childSyncPipe, childStartPipe)
if r.reservePorts && !rootless.IsRootless() && !ctr.config.NetMode.IsSlirp4netns() {
ports, err := bindPorts(ctr.convertPortMappings())
if err != nil {
return 0, err
}
filesToClose = append(filesToClose, ports...)
// Leak the port we bound in the conmon process. These fd's won't be used
// by the container and conmon will keep the ports busy so that another
// process cannot use them.
cmd.ExtraFiles = append(cmd.ExtraFiles, ports...)
}
if ctr.config.NetMode.IsSlirp4netns() || rootless.IsRootless() {
if ctr.config.PostConfigureNetNS {
havePortMapping := len(ctr.config.PortMappings) > 0
if havePortMapping {
ctr.rootlessPortSyncR, ctr.rootlessPortSyncW, err = os.Pipe()
if err != nil {
return 0, fmt.Errorf("failed to create rootless port sync pipe: %w", err)
}
}
ctr.rootlessSlirpSyncR, ctr.rootlessSlirpSyncW, err = os.Pipe()
if err != nil {
return 0, fmt.Errorf("failed to create rootless network sync pipe: %w", err)
}
} else {
if ctr.rootlessSlirpSyncR != nil {
defer errorhandling.CloseQuiet(ctr.rootlessSlirpSyncR)
}
if ctr.rootlessSlirpSyncW != nil {
defer errorhandling.CloseQuiet(ctr.rootlessSlirpSyncW)
}
}
// Leak one end in conmon, the other one will be leaked into slirp4netns
cmd.ExtraFiles = append(cmd.ExtraFiles, ctr.rootlessSlirpSyncW)
if ctr.rootlessPortSyncW != nil {
defer errorhandling.CloseQuiet(ctr.rootlessPortSyncW)
// Leak one end in conmon, the other one will be leaked into rootlessport
cmd.ExtraFiles = append(cmd.ExtraFiles, ctr.rootlessPortSyncW)
}
}
var runtimeRestoreStarted time.Time
if restoreOptions != nil {
runtimeRestoreStarted = time.Now()
}
err = startCommand(cmd, ctr)
// regardless of whether we errored or not, we no longer need the children pipes
childSyncPipe.Close()
childStartPipe.Close()
if err != nil {
return 0, err
}
if err := r.moveConmonToCgroupAndSignal(ctr, cmd, parentStartPipe); err != nil {
return 0, err
}
/* Wait for initial setup and fork, and reap child */
err = cmd.Wait()
if err != nil {
return 0, err
}
pid, err := readConmonPipeData(r.name, parentSyncPipe, ociLog)
if err != nil {
if err2 := r.DeleteContainer(ctr); err2 != nil {
logrus.Errorf("Removing container %s from runtime after creation failed", ctr.ID())
}
return 0, err
}
ctr.state.PID = pid
conmonPID, err := readConmonPidFile(ctr.config.ConmonPidFile)
if err != nil {
logrus.Warnf("Error reading conmon pid file for container %s: %v", ctr.ID(), err)
} else if conmonPID > 0 {
// conmon not having a pid file is a valid state, so don't set it if we don't have it
logrus.Infof("Got Conmon PID as %d", conmonPID)
ctr.state.ConmonPID = conmonPID
}
runtimeRestoreDuration := func() int64 {
if restoreOptions != nil && restoreOptions.PrintStats {
return time.Since(runtimeRestoreStarted).Microseconds()
}
return 0
}()
// These fds were passed down to the runtime. Close them
// and not interfere
for _, f := range filesToClose {
errorhandling.CloseQuiet(f)
}
return runtimeRestoreDuration, nil
}
// configureConmonEnv gets the environment values to add to conmon's exec struct
// TODO this may want to be less hardcoded/more configurable in the future
func (r *ConmonOCIRuntime) configureConmonEnv(runtimeDir string) []string {
var env []string
for _, e := range os.Environ() {
if strings.HasPrefix(e, "LC_") {
env = append(env, e)
}
}
conf, ok := os.LookupEnv("CONTAINERS_CONF")
if ok {
env = append(env, fmt.Sprintf("CONTAINERS_CONF=%s", conf))
}
env = append(env, fmt.Sprintf("XDG_RUNTIME_DIR=%s", runtimeDir))
env = append(env, fmt.Sprintf("_CONTAINERS_USERNS_CONFIGURED=%s", os.Getenv("_CONTAINERS_USERNS_CONFIGURED")))
env = append(env, fmt.Sprintf("_CONTAINERS_ROOTLESS_UID=%s", os.Getenv("_CONTAINERS_ROOTLESS_UID")))
home := homedir.Get()
if home != "" {
env = append(env, fmt.Sprintf("HOME=%s", home))
}
return env
}
// sharedConmonArgs takes common arguments for exec and create/restore and formats them for the conmon CLI
func (r *ConmonOCIRuntime) sharedConmonArgs(ctr *Container, cuuid, bundlePath, pidPath, logPath, exitDir, ociLogPath, logDriver, logTag string) []string {
// set the conmon API version to be able to use the correct sync struct keys
args := []string{
"--api-version", "1",
"-c", ctr.ID(),
"-u", cuuid,
"-r", r.path,
"-b", bundlePath,
"-p", pidPath,
"-n", ctr.Name(),
"--exit-dir", exitDir,
"--full-attach",
}
if len(r.runtimeFlags) > 0 {
rFlags := []string{}
for _, arg := range r.runtimeFlags {
rFlags = append(rFlags, "--runtime-arg", arg)
}
args = append(args, rFlags...)
}
if ctr.CgroupManager() == config.SystemdCgroupsManager && !ctr.config.NoCgroups && ctr.config.CgroupsMode != cgroupSplit {
args = append(args, "-s")
}
var logDriverArg string
switch logDriver {
case define.JournaldLogging:
logDriverArg = define.JournaldLogging
case define.NoLogging:
logDriverArg = define.NoLogging
case define.PassthroughLogging:
logDriverArg = define.PassthroughLogging
//lint:ignore ST1015 the default case has to be here
default: //nolint:stylecheck,gocritic
// No case here should happen except JSONLogging, but keep this here in case the options are extended
logrus.Errorf("%s logging specified but not supported. Choosing k8s-file logging instead", ctr.LogDriver())
fallthrough
case "":
// to get here, either a user would specify `--log-driver ""`, or this came from another place in libpod
// since the former case is obscure, and the latter case isn't an error, let's silently fallthrough
fallthrough
case define.JSONLogging:
fallthrough
case define.KubernetesLogging:
logDriverArg = fmt.Sprintf("%s:%s", define.KubernetesLogging, logPath)
}
args = append(args, "-l", logDriverArg)
logLevel := logrus.GetLevel()
args = append(args, "--log-level", logLevel.String())
if logLevel == logrus.DebugLevel {
logrus.Debugf("%s messages will be logged to syslog", r.conmonPath)
args = append(args, "--syslog")
}
size := r.logSizeMax
if ctr.config.LogSize > 0 {
size = ctr.config.LogSize
}
if size > 0 {
args = append(args, "--log-size-max", fmt.Sprintf("%v", size))
}
if ociLogPath != "" {
args = append(args, "--runtime-arg", "--log-format=json", "--runtime-arg", "--log", fmt.Sprintf("--runtime-arg=%s", ociLogPath))
}
if logTag != "" {
args = append(args, "--log-tag", logTag)
}
if ctr.config.NoCgroups {
logrus.Debugf("Running with no Cgroups")
args = append(args, "--runtime-arg", "--cgroup-manager", "--runtime-arg", "disabled")
}
return args
}
func startCommand(cmd *exec.Cmd, ctr *Container) error {
// Make sure to unset the NOTIFY_SOCKET and reset it afterwards if needed.
switch ctr.config.SdNotifyMode {
case define.SdNotifyModeContainer, define.SdNotifyModeIgnore:
if ctr.notifySocket != "" {
if err := os.Unsetenv("NOTIFY_SOCKET"); err != nil {
logrus.Warnf("Error unsetting NOTIFY_SOCKET %v", err)
}
defer func() {
if err := os.Setenv("NOTIFY_SOCKET", ctr.notifySocket); err != nil {
logrus.Errorf("Resetting NOTIFY_SOCKET=%s", ctr.notifySocket)
}
}()
}
}
return cmd.Start()
}
// moveConmonToCgroupAndSignal gets a container's cgroupParent and moves the conmon process to that cgroup
// it then signals for conmon to start by sending nonce data down the start fd
func (r *ConmonOCIRuntime) moveConmonToCgroupAndSignal(ctr *Container, cmd *exec.Cmd, startFd *os.File) error {
mustCreateCgroup := true
if ctr.config.NoCgroups {
mustCreateCgroup = false
}
// If cgroup creation is disabled - just signal.
switch ctr.config.CgroupsMode {
case "disabled", "no-conmon", cgroupSplit:
mustCreateCgroup = false
}
// $INVOCATION_ID is set by systemd when running as a service.
if ctr.runtime.RemoteURI() == "" && os.Getenv("INVOCATION_ID") != "" {
mustCreateCgroup = false
}
if mustCreateCgroup {
// Usually rootless users are not allowed to configure cgroupfs.
// There are cases though, where it is allowed, e.g. if the cgroup
// is manually configured and chowned). Avoid detecting all
// such cases and simply use a lower log level.
logLevel := logrus.WarnLevel
if rootless.IsRootless() {
logLevel = logrus.InfoLevel
}
// TODO: This should be a switch - we are not guaranteed that
// there are only 2 valid cgroup managers
cgroupParent := ctr.CgroupParent()
cgroupPath := filepath.Join(ctr.config.CgroupParent, "conmon")
Resource := ctr.Spec().Linux.Resources
cgroupResources, err := GetLimits(Resource)
if err != nil {
logrus.StandardLogger().Log(logLevel, "Could not get ctr resources")
}
if ctr.CgroupManager() == config.SystemdCgroupsManager {
unitName := createUnitName("libpod-conmon", ctr.ID())
realCgroupParent := cgroupParent
splitParent := strings.Split(cgroupParent, "/")
if strings.HasSuffix(cgroupParent, ".slice") && len(splitParent) > 1 {
realCgroupParent = splitParent[len(splitParent)-1]
}
logrus.Infof("Running conmon under slice %s and unitName %s", realCgroupParent, unitName)
if err := utils.RunUnderSystemdScope(cmd.Process.Pid, realCgroupParent, unitName); err != nil {
logrus.StandardLogger().Logf(logLevel, "Failed to add conmon to systemd sandbox cgroup: %v", err)
}
} else {
control, err := cgroups.New(cgroupPath, &cgroupResources)
if err != nil {
logrus.StandardLogger().Logf(logLevel, "Failed to add conmon to cgroupfs sandbox cgroup: %v", err)
} else if err := control.AddPid(cmd.Process.Pid); err != nil {
// we need to remove this defer and delete the cgroup once conmon exits
// maybe need a conmon monitor?
logrus.StandardLogger().Logf(logLevel, "Failed to add conmon to cgroupfs sandbox cgroup: %v", err)
}
}
}
/* We set the cgroup, now the child can start creating children */
if err := writeConmonPipeData(startFd); err != nil {
return err
}
return nil
}
// newPipe creates a unix socket pair for communication.
// Returns two files - first is parent, second is child.
func newPipe() (*os.File, *os.File, error) {
fds, err := unix.Socketpair(unix.AF_LOCAL, unix.SOCK_SEQPACKET|unix.SOCK_CLOEXEC, 0)
if err != nil {
return nil, nil, err
}
return os.NewFile(uintptr(fds[1]), "parent"), os.NewFile(uintptr(fds[0]), "child"), nil
}
// readConmonPidFile attempts to read conmon's pid from its pid file
func readConmonPidFile(pidFile string) (int, error) {
// Let's try reading the Conmon pid at the same time.
if pidFile != "" {
contents, err := ioutil.ReadFile(pidFile)
if err != nil {
return -1, err
}
// Convert it to an int
conmonPID, err := strconv.Atoi(string(contents))
if err != nil {
return -1, err
}
return conmonPID, nil
}
return 0, nil
}
// readConmonPipeData attempts to read a syncInfo struct from the pipe
func readConmonPipeData(runtimeName string, pipe *os.File, ociLog string) (int, error) {
// syncInfo is used to return data from monitor process to daemon
type syncInfo struct {
Data int `json:"data"`
Message string `json:"message,omitempty"`
}
// Wait to get container pid from conmon
type syncStruct struct {
si *syncInfo
err error
}
ch := make(chan syncStruct)
go func() {
var si *syncInfo
rdr := bufio.NewReader(pipe)
b, err := rdr.ReadBytes('\n')
// ignore EOF here, error is returned even when data was read
// if it is no valid json unmarshal will fail below
if err != nil && !errors.Is(err, io.EOF) {
ch <- syncStruct{err: err}
}
if err := json.Unmarshal(b, &si); err != nil {
ch <- syncStruct{err: fmt.Errorf("conmon bytes %q: %w", string(b), err)}
return
}
ch <- syncStruct{si: si}
}()
data := -1 //nolint: wastedassign
select {
case ss := <-ch:
if ss.err != nil {
if ociLog != "" {
ociLogData, err := ioutil.ReadFile(ociLog)
if err == nil {
var ociErr ociError
if err := json.Unmarshal(ociLogData, &ociErr); err == nil {
return -1, getOCIRuntimeError(runtimeName, ociErr.Msg)
}
}
}
return -1, fmt.Errorf("container create failed (no logs from conmon): %w", ss.err)
}
logrus.Debugf("Received: %d", ss.si.Data)
if ss.si.Data < 0 {
if ociLog != "" {
ociLogData, err := ioutil.ReadFile(ociLog)
if err == nil {
var ociErr ociError
if err := json.Unmarshal(ociLogData, &ociErr); err == nil {
return ss.si.Data, getOCIRuntimeError(runtimeName, ociErr.Msg)
}
}
}
// If we failed to parse the JSON errors, then print the output as it is
if ss.si.Message != "" {
return ss.si.Data, getOCIRuntimeError(runtimeName, ss.si.Message)
}
return ss.si.Data, fmt.Errorf("container create failed: %w", define.ErrInternal)
}
data = ss.si.Data
case <-time.After(define.ContainerCreateTimeout):
return -1, fmt.Errorf("container creation timeout: %w", define.ErrInternal)
}
return data, nil
}
// writeConmonPipeData writes nonce data to a pipe
func writeConmonPipeData(pipe *os.File) error {
someData := []byte{0}
_, err := pipe.Write(someData)
return err
}
// formatRuntimeOpts prepends opts passed to it with --runtime-opt for passing to conmon
func formatRuntimeOpts(opts ...string) []string {
args := make([]string, 0, len(opts)*2)
for _, o := range opts {
args = append(args, "--runtime-opt", o)
}
return args
}
// getConmonVersion returns a string representation of the conmon version.
func (r *ConmonOCIRuntime) getConmonVersion() (string, error) {
output, err := utils.ExecCmd(r.conmonPath, "--version")
if err != nil {
return "", err
}
return strings.TrimSuffix(strings.Replace(output, "\n", ", ", 1), "\n"), nil
}
// getOCIRuntimeVersion returns a string representation of the OCI runtime's
// version.
func (r *ConmonOCIRuntime) getOCIRuntimeVersion() (string, error) {
output, err := utils.ExecCmd(r.path, "--version")
if err != nil {
return "", err
}
return strings.TrimSuffix(output, "\n"), nil
}
// Copy data from container to HTTP connection, for terminal attach.
// Container is the container's attach socket connection, http is a buffer for
// the HTTP connection. cid is the ID of the container the attach session is
// running for (used solely for error messages).
func httpAttachTerminalCopy(container *net.UnixConn, http *bufio.ReadWriter, cid string) error {
buf := make([]byte, bufferSize)
for {
numR, err := container.Read(buf)
logrus.Debugf("Read fd(%d) %d/%d bytes for container %s", int(buf[0]), numR, len(buf), cid)
if numR > 0 {
switch buf[0] {
case AttachPipeStdout:
// Do nothing
default:
logrus.Errorf("Received unexpected attach type %+d, discarding %d bytes", buf[0], numR)
continue
}
numW, err2 := http.Write(buf[1:numR])
if err2 != nil {
if err != nil {
logrus.Errorf("Reading container %s STDOUT: %v", cid, err)
}
return err2
} else if numW+1 != numR {
return io.ErrShortWrite
}
// We need to force the buffer to write immediately, so
// there isn't a delay on the terminal side.
if err2 := http.Flush(); err2 != nil {
if err != nil {
logrus.Errorf("Reading container %s STDOUT: %v", cid, err)
}
return err2
}
}
if err != nil {
if err == io.EOF {
return nil
}
return err
}
}
}
// Copy data from a container to an HTTP connection, for non-terminal attach.
// Appends a header to multiplex input.
func httpAttachNonTerminalCopy(container *net.UnixConn, http *bufio.ReadWriter, cid string, stdin, stdout, stderr bool) error {
buf := make([]byte, bufferSize)
for {
numR, err := container.Read(buf)
if numR > 0 {
var headerBuf []byte
// Subtract 1 because we strip the first byte (used for
// multiplexing by Conmon).
headerLen := uint32(numR - 1)
// Practically speaking, we could make this buf[0] - 1,
// but we need to validate it anyway.
switch buf[0] {
case AttachPipeStdin:
headerBuf = makeHTTPAttachHeader(0, headerLen)
if !stdin {
continue
}
case AttachPipeStdout:
if !stdout {
continue
}
headerBuf = makeHTTPAttachHeader(1, headerLen)
case AttachPipeStderr:
if !stderr {
continue
}
headerBuf = makeHTTPAttachHeader(2, headerLen)
default:
logrus.Errorf("Received unexpected attach type %+d, discarding %d bytes", buf[0], numR)
continue
}
numH, err2 := http.Write(headerBuf)
if err2 != nil {
if err != nil {
logrus.Errorf("Reading container %s standard streams: %v", cid, err)
}
return err2
}
// Hardcoding header length is pretty gross, but
// fast. Should be safe, as this is a fixed part
// of the protocol.
if numH != 8 {
if err != nil {
logrus.Errorf("Reading container %s standard streams: %v", cid, err)
}
return io.ErrShortWrite
}
numW, err2 := http.Write(buf[1:numR])
if err2 != nil {
if err != nil {
logrus.Errorf("Reading container %s standard streams: %v", cid, err)
}
return err2
} else if numW+1 != numR {
if err != nil {
logrus.Errorf("Reading container %s standard streams: %v", cid, err)
}
return io.ErrShortWrite
}
// We need to force the buffer to write immediately, so
// there isn't a delay on the terminal side.
if err2 := http.Flush(); err2 != nil {
if err != nil {
logrus.Errorf("Reading container %s STDOUT: %v", cid, err)
}
return err2
}
}
if err != nil {
if err == io.EOF {
return nil
}
return err
}
}
}
// GetLimits converts spec resource limits to cgroup consumable limits
func GetLimits(resource *spec.LinuxResources) (runcconfig.Resources, error) {
if resource == nil {
resource = &spec.LinuxResources{}
}
final := &runcconfig.Resources{}
devs := []*devices.Rule{}
// Devices
for _, entry := range resource.Devices {
if entry.Major == nil || entry.Minor == nil {
continue
}
runeType := 'a'
switch entry.Type {
case "b":
runeType = 'b'
case "c":
runeType = 'c'
}
devs = append(devs, &devices.Rule{
Type: devices.Type(runeType),
Major: *entry.Major,
Minor: *entry.Minor,
Permissions: devices.Permissions(entry.Access),
Allow: entry.Allow,
})
}
final.Devices = devs
// HugepageLimits
pageLimits := []*runcconfig.HugepageLimit{}
for _, entry := range resource.HugepageLimits {
pageLimits = append(pageLimits, &runcconfig.HugepageLimit{
Pagesize: entry.Pagesize,
Limit: entry.Limit,
})
}
final.HugetlbLimit = pageLimits
// Networking
netPriorities := []*runcconfig.IfPrioMap{}
if resource.Network != nil {
for _, entry := range resource.Network.Priorities {
netPriorities = append(netPriorities, &runcconfig.IfPrioMap{
Interface: entry.Name,
Priority: int64(entry.Priority),
})
}
}
final.NetPrioIfpriomap = netPriorities
rdma := make(map[string]runcconfig.LinuxRdma)
for name, entry := range resource.Rdma {
rdma[name] = runcconfig.LinuxRdma{HcaHandles: entry.HcaHandles, HcaObjects: entry.HcaObjects}
}
final.Rdma = rdma
// Memory
if resource.Memory != nil {
if resource.Memory.Limit != nil {
final.Memory = *resource.Memory.Limit
}
if resource.Memory.Reservation != nil {
final.MemoryReservation = *resource.Memory.Reservation
}
if resource.Memory.Swap != nil {
final.MemorySwap = *resource.Memory.Swap
}
if resource.Memory.Swappiness != nil {
final.MemorySwappiness = resource.Memory.Swappiness
}
}
// CPU
if resource.CPU != nil {
if resource.CPU.Period != nil {
final.CpuPeriod = *resource.CPU.Period
}
if resource.CPU.Quota != nil {
final.CpuQuota = *resource.CPU.Quota
}
if resource.CPU.RealtimePeriod != nil {
final.CpuRtPeriod = *resource.CPU.RealtimePeriod
}
if resource.CPU.RealtimeRuntime != nil {
final.CpuRtRuntime = *resource.CPU.RealtimeRuntime
}
if resource.CPU.Shares != nil {
final.CpuShares = *resource.CPU.Shares
}
final.CpusetCpus = resource.CPU.Cpus
final.CpusetMems = resource.CPU.Mems
}
// BlkIO
if resource.BlockIO != nil {
if len(resource.BlockIO.ThrottleReadBpsDevice) > 0 {
for _, entry := range resource.BlockIO.ThrottleReadBpsDevice {
throttle := &runcconfig.ThrottleDevice{}
dev := &runcconfig.BlockIODevice{
Major: entry.Major,
Minor: entry.Minor,
}
throttle.BlockIODevice = *dev
throttle.Rate = entry.Rate
final.BlkioThrottleReadBpsDevice = append(final.BlkioThrottleReadBpsDevice, throttle)
}
}
if len(resource.BlockIO.ThrottleWriteBpsDevice) > 0 {
for _, entry := range resource.BlockIO.ThrottleWriteBpsDevice {
throttle := &runcconfig.ThrottleDevice{}
dev := &runcconfig.BlockIODevice{
Major: entry.Major,
Minor: entry.Minor,
}
throttle.BlockIODevice = *dev
throttle.Rate = entry.Rate
final.BlkioThrottleWriteBpsDevice = append(final.BlkioThrottleWriteBpsDevice, throttle)
}
}
if len(resource.BlockIO.ThrottleReadIOPSDevice) > 0 {
for _, entry := range resource.BlockIO.ThrottleReadIOPSDevice {
throttle := &runcconfig.ThrottleDevice{}
dev := &runcconfig.BlockIODevice{
Major: entry.Major,
Minor: entry.Minor,
}
throttle.BlockIODevice = *dev
throttle.Rate = entry.Rate
final.BlkioThrottleReadIOPSDevice = append(final.BlkioThrottleReadIOPSDevice, throttle)
}
}
if len(resource.BlockIO.ThrottleWriteIOPSDevice) > 0 {
for _, entry := range resource.BlockIO.ThrottleWriteIOPSDevice {
throttle := &runcconfig.ThrottleDevice{}
dev := &runcconfig.BlockIODevice{
Major: entry.Major,
Minor: entry.Minor,
}
throttle.BlockIODevice = *dev
throttle.Rate = entry.Rate
final.BlkioThrottleWriteIOPSDevice = append(final.BlkioThrottleWriteIOPSDevice, throttle)
}
}
if resource.BlockIO.LeafWeight != nil {
final.BlkioLeafWeight = *resource.BlockIO.LeafWeight
}
if resource.BlockIO.Weight != nil {
final.BlkioWeight = *resource.BlockIO.Weight
}
if len(resource.BlockIO.WeightDevice) > 0 {
for _, entry := range resource.BlockIO.WeightDevice {
weight := &runcconfig.WeightDevice{}
dev := &runcconfig.BlockIODevice{
Major: entry.Major,
Minor: entry.Minor,
}
if entry.Weight != nil {
weight.Weight = *entry.Weight
}
if entry.LeafWeight != nil {
weight.LeafWeight = *entry.LeafWeight
}
weight.BlockIODevice = *dev
final.BlkioWeightDevice = append(final.BlkioWeightDevice, weight)
}
}
}
// Pids
if resource.Pids != nil {
final.PidsLimit = resource.Pids.Limit
}
// Networking
if resource.Network != nil {
if resource.Network.ClassID != nil {
final.NetClsClassid = *resource.Network.ClassID
}
}
// Unified state
final.Unified = resource.Unified
return *final, nil
}
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