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-rw-r--r--libpod/oci_conmon_linux.go1421
1 files changed, 1421 insertions, 0 deletions
diff --git a/libpod/oci_conmon_linux.go b/libpod/oci_conmon_linux.go
new file mode 100644
index 000000000..f29758a69
--- /dev/null
+++ b/libpod/oci_conmon_linux.go
@@ -0,0 +1,1421 @@
+// +build linux
+
+package libpod
+
+import (
+ "bufio"
+ "bytes"
+ "fmt"
+ "io/ioutil"
+ "os"
+ "os/exec"
+ "path/filepath"
+ "runtime"
+ "strconv"
+ "strings"
+ "syscall"
+ "time"
+
+ "github.com/containers/libpod/libpod/define"
+ "github.com/containers/libpod/pkg/cgroups"
+ "github.com/containers/libpod/pkg/errorhandling"
+ "github.com/containers/libpod/pkg/lookup"
+ "github.com/containers/libpod/pkg/rootless"
+ "github.com/containers/libpod/pkg/util"
+ "github.com/containers/libpod/utils"
+ pmount "github.com/containers/storage/pkg/mount"
+ "github.com/coreos/go-systemd/activation"
+ spec "github.com/opencontainers/runtime-spec/specs-go"
+ "github.com/opencontainers/selinux/go-selinux"
+ "github.com/opencontainers/selinux/go-selinux/label"
+ "github.com/pkg/errors"
+ "github.com/sirupsen/logrus"
+ "golang.org/x/sys/unix"
+)
+
+// 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
+ cgroupManager string
+ tmpDir string
+ exitsDir string
+ socketsDir string
+ logSizeMax int64
+ noPivot bool
+ reservePorts bool
+ supportsJSON bool
+ supportsNoCgroups bool
+ sdNotify 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, runtimeCfg *RuntimeConfig, supportsJSON, supportsNoCgroups bool) (OCIRuntime, error) {
+ if name == "" {
+ return nil, errors.Wrapf(define.ErrInvalidArg, "the OCI runtime must be provided a non-empty name")
+ }
+
+ runtime := new(ConmonOCIRuntime)
+ runtime.name = name
+ runtime.conmonPath = conmonPath
+
+ runtime.conmonEnv = runtimeCfg.ConmonEnvVars
+ runtime.cgroupManager = runtimeCfg.CgroupManager
+ runtime.tmpDir = runtimeCfg.TmpDir
+ runtime.logSizeMax = runtimeCfg.MaxLogSize
+ runtime.noPivot = runtimeCfg.NoPivotRoot
+ runtime.reservePorts = runtimeCfg.EnablePortReservation
+ runtime.sdNotify = runtimeCfg.SDNotify
+
+ // TODO: probe OCI runtime for feature and enable automatically if
+ // available.
+ runtime.supportsJSON = supportsJSON
+ runtime.supportsNoCgroups = supportsNoCgroups
+
+ foundPath := false
+ for _, path := range paths {
+ stat, err := os.Stat(path)
+ if err != nil {
+ if os.IsNotExist(err) {
+ continue
+ }
+ return nil, errors.Wrapf(err, "cannot stat %s", path)
+ }
+ if !stat.Mode().IsRegular() {
+ continue
+ }
+ foundPath = true
+ runtime.path = path
+ logrus.Debugf("using runtime %q", 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, errors.Wrapf(define.ErrInvalidArg, "no valid executable found for OCI runtime %s", name)
+ }
+
+ runtime.exitsDir = filepath.Join(runtime.tmpDir, "exits")
+ runtime.socketsDir = filepath.Join(runtime.tmpDir, "socket")
+
+ if runtime.cgroupManager != CgroupfsCgroupsManager && runtime.cgroupManager != SystemdCgroupsManager {
+ return nil, errors.Wrapf(define.ErrInvalidArg, "invalid cgroup manager specified: %s", runtime.cgroupManager)
+ }
+
+ // 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, errors.Wrapf(err, "error creating OCI runtime exit files directory %s",
+ runtime.exitsDir)
+ }
+ }
+ if err := os.MkdirAll(runtime.socketsDir, 0750); err != nil {
+ // The directory is allowed to exist
+ if !os.IsExist(err) {
+ return nil, errors.Wrapf(err, "error creating OCI runtime attach sockets directory %s",
+ runtime.socketsDir)
+ }
+ }
+
+ 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
+}
+
+// CreateContainer creates a container.
+func (r *ConmonOCIRuntime) CreateContainer(ctr *Container, restoreOptions *ContainerCheckpointOptions) (err error) {
+ if len(ctr.config.IDMappings.UIDMap) != 0 || len(ctr.config.IDMappings.GIDMap) != 0 {
+ for _, i := range []string{ctr.state.RunDir, ctr.runtime.config.TmpDir, ctr.config.StaticDir, ctr.state.Mountpoint, ctr.runtime.config.VolumePath} {
+ if err := makeAccessible(i, ctr.RootUID(), ctr.RootGID()); err != nil {
+ return 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() {
+ ch := make(chan error)
+ go func() {
+ runtime.LockOSThread()
+ err := func() error {
+ fd, err := os.Open(fmt.Sprintf("/proc/%d/task/%d/ns/mnt", os.Getpid(), unix.Gettid()))
+ if err != nil {
+ return err
+ }
+ defer errorhandling.CloseQuiet(fd)
+
+ // create a new mountns on the current thread
+ if err = unix.Unshare(unix.CLONE_NEWNS); err != nil {
+ return 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 errors.Wrapf(err, "cannot make /sys slave")
+ }
+
+ mounts, err := pmount.GetMounts()
+ if err != nil {
+ return 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 errors.Wrapf(err, "cannot unmount %s", m.Mountpoint)
+ }
+ }
+ return r.createOCIContainer(ctr, restoreOptions)
+ }()
+ ch <- err
+ }()
+ err := <-ch
+ return 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, useRuntime bool) error {
+ exitFile, err := ctr.exitFilePath()
+ if err != nil {
+ return err
+ }
+
+ runtimeDir, err := util.GetRuntimeDir()
+ if err != nil {
+ return err
+ }
+
+ // If not using the OCI runtime, we don't need to do most of this.
+ if !useRuntime {
+ // If the container's not running, nothing to do.
+ if ctr.state.State != define.ContainerStateRunning && ctr.state.State != define.ContainerStatePaused {
+ return nil
+ }
+
+ // Check for the exit file conmon makes
+ info, err := os.Stat(exitFile)
+ if err != nil {
+ if os.IsNotExist(err) {
+ // Container is still running, no error
+ return nil
+ }
+
+ return errors.Wrapf(err, "error running stat on container %s exit file", ctr.ID())
+ }
+
+ // Alright, it exists. Transition to Stopped state.
+ ctr.state.State = define.ContainerStateStopped
+ ctr.state.PID = 0
+ ctr.state.ConmonPID = 0
+
+ // Read the exit file to get our stopped time and exit code.
+ return ctr.handleExitFile(exitFile, info)
+ }
+
+ // 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 errors.Wrapf(err, "getting stdout pipe")
+ }
+ errPipe, err := cmd.StderrPipe()
+ if err != nil {
+ return errors.Wrapf(err, "getting stderr pipe")
+ }
+
+ if err := cmd.Start(); err != nil {
+ out, err2 := ioutil.ReadAll(errPipe)
+ if err2 != nil {
+ return errors.Wrapf(err, "error getting container %s state", ctr.ID())
+ }
+ if strings.Contains(string(out), "does not exist") {
+ 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 nil
+ }
+ return errors.Wrapf(err, "error getting container %s state. stderr/out: %s", ctr.ID(), out)
+ }
+ defer func() {
+ _ = cmd.Wait()
+ }()
+
+ if err := errPipe.Close(); err != nil {
+ return err
+ }
+ out, err := ioutil.ReadAll(outPipe)
+ if err != nil {
+ return errors.Wrapf(err, "error reading stdout: %s", ctr.ID())
+ }
+ if err := json.NewDecoder(bytes.NewBuffer(out)).Decode(state); err != nil {
+ return errors.Wrapf(err, "error decoding container status for container %s", ctr.ID())
+ }
+ 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 errors.Wrapf(define.ErrInternal, "unrecognized status returned by runtime for container %s: %s",
+ ctr.ID(), state.Status)
+ }
+
+ // 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 {
+ var fi os.FileInfo
+ chWait := make(chan error)
+ defer close(chWait)
+
+ _, err := WaitForFile(exitFile, chWait, time.Second*5)
+ if err == nil {
+ fi, err = os.Stat(exitFile)
+ }
+ if err != nil {
+ ctr.state.ExitCode = -1
+ ctr.state.FinishedTime = time.Now()
+ logrus.Errorf("No exit file for container %s found: %v", ctr.ID(), err)
+ return nil
+ }
+
+ return ctr.handleExitFile(exitFile, fi)
+ }
+
+ 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 notify, ok := os.LookupEnv("NOTIFY_SOCKET"); ok {
+ env = append(env, fmt.Sprintf("NOTIFY_SOCKET=%s", notify))
+ }
+ if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, "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
+ if all {
+ args = []string{"kill", "--all", ctr.ID(), fmt.Sprintf("%d", signal)}
+ } else {
+ args = []string{"kill", ctr.ID(), fmt.Sprintf("%d", signal)}
+ }
+ if err := utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, env, r.path, args...); err != nil {
+ return errors.Wrapf(err, "error sending signal to container %s", ctr.ID())
+ }
+
+ 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.Warnf("Timed out stopping container %s, resorting to SIGKILL", ctr.ID())
+ } 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 errors.Wrapf(err, "error sending SIGKILL to container %s", ctr.ID())
+ }
+
+ // 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, "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, "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, "resume", ctr.ID())
+}
+
+// ExecContainer executes a command in a running container
+// TODO: Split into Create/Start/Attach/Wait
+func (r *ConmonOCIRuntime) ExecContainer(c *Container, sessionID string, options *ExecOptions) (int, chan error, error) {
+ if options == nil {
+ return -1, nil, errors.Wrapf(define.ErrInvalidArg, "must provide an ExecOptions struct to ExecContainer")
+ }
+ if len(options.Cmd) == 0 {
+ return -1, nil, errors.Wrapf(define.ErrInvalidArg, "must provide a command to execute")
+ }
+
+ if sessionID == "" {
+ return -1, nil, errors.Wrapf(define.ErrEmptyID, "must provide a session ID for exec")
+ }
+
+ // create sync pipe to receive the pid
+ parentSyncPipe, childSyncPipe, err := newPipe()
+ if err != nil {
+ return -1, nil, errors.Wrapf(err, "error creating socket pair")
+ }
+
+ defer errorhandling.CloseQuiet(parentSyncPipe)
+
+ // create start pipe to set the cgroup before running
+ // attachToExec is responsible for closing parentStartPipe
+ childStartPipe, parentStartPipe, err := newPipe()
+ if err != nil {
+ return -1, nil, errors.Wrapf(err, "error creating socket pair")
+ }
+
+ // We want to make sure we close the parent{Start,Attach}Pipes if we fail
+ // but also don't want to close them after attach to exec is called
+ attachToExecCalled := false
+
+ defer func() {
+ if !attachToExecCalled {
+ errorhandling.CloseQuiet(parentStartPipe)
+ }
+ }()
+
+ // create the attach pipe to allow attach socket to be created before
+ // $RUNTIME exec starts running. This is to make sure we can capture all output
+ // from the process through that socket, rather than half reading the log, half attaching to the socket
+ // attachToExec is responsible for closing parentAttachPipe
+ parentAttachPipe, childAttachPipe, err := newPipe()
+ if err != nil {
+ return -1, nil, errors.Wrapf(err, "error creating socket pair")
+ }
+
+ defer func() {
+ if !attachToExecCalled {
+ errorhandling.CloseQuiet(parentAttachPipe)
+ }
+ }()
+
+ childrenClosed := false
+ defer func() {
+ if !childrenClosed {
+ errorhandling.CloseQuiet(childSyncPipe)
+ errorhandling.CloseQuiet(childAttachPipe)
+ errorhandling.CloseQuiet(childStartPipe)
+ }
+ }()
+
+ runtimeDir, err := util.GetRuntimeDir()
+ if err != nil {
+ return -1, nil, err
+ }
+
+ finalEnv := make([]string, 0, len(options.Env))
+ for k, v := range options.Env {
+ finalEnv = append(finalEnv, fmt.Sprintf("%s=%s", k, v))
+ }
+
+ processFile, err := prepareProcessExec(c, options.Cmd, finalEnv, options.Terminal, options.Cwd, options.User, sessionID)
+ if err != nil {
+ return -1, nil, err
+ }
+
+ var ociLog string
+ if logrus.GetLevel() != logrus.DebugLevel && r.supportsJSON {
+ ociLog = c.execOCILog(sessionID)
+ }
+ args := r.sharedConmonArgs(c, sessionID, c.execBundlePath(sessionID), c.execPidPath(sessionID), c.execLogPath(sessionID), c.execExitFileDir(sessionID), ociLog)
+
+ if options.PreserveFDs > 0 {
+ args = append(args, formatRuntimeOpts("--preserve-fds", fmt.Sprintf("%d", options.PreserveFDs))...)
+ }
+
+ for _, capability := range options.CapAdd {
+ args = append(args, formatRuntimeOpts("--cap", capability)...)
+ }
+
+ if options.Terminal {
+ args = append(args, "-t")
+ }
+
+ // Append container ID and command
+ args = append(args, "-e")
+ // TODO make this optional when we can detach
+ args = append(args, "--exec-attach")
+ args = append(args, "--exec-process-spec", processFile.Name())
+
+ logrus.WithFields(logrus.Fields{
+ "args": args,
+ }).Debugf("running conmon: %s", r.conmonPath)
+ execCmd := exec.Command(r.conmonPath, args...)
+
+ if options.Streams != nil {
+ if options.Streams.AttachInput {
+ execCmd.Stdin = options.Streams.InputStream
+ }
+ if options.Streams.AttachOutput {
+ execCmd.Stdout = options.Streams.OutputStream
+ }
+ if options.Streams.AttachError {
+ execCmd.Stderr = options.Streams.ErrorStream
+ }
+ }
+
+ conmonEnv, extraFiles, err := r.configureConmonEnv(runtimeDir)
+ if err != nil {
+ return -1, nil, err
+ }
+
+ if options.PreserveFDs > 0 {
+ for fd := 3; fd < int(3+options.PreserveFDs); fd++ {
+ execCmd.ExtraFiles = append(execCmd.ExtraFiles, os.NewFile(uintptr(fd), fmt.Sprintf("fd-%d", fd)))
+ }
+ }
+
+ // 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
+ execCmd.Env = append(r.conmonEnv, fmt.Sprintf("_OCI_SYNCPIPE=%d", options.PreserveFDs+3), fmt.Sprintf("_OCI_STARTPIPE=%d", options.PreserveFDs+4), fmt.Sprintf("_OCI_ATTACHPIPE=%d", options.PreserveFDs+5))
+ execCmd.Env = append(execCmd.Env, conmonEnv...)
+
+ execCmd.ExtraFiles = append(execCmd.ExtraFiles, childSyncPipe, childStartPipe, childAttachPipe)
+ execCmd.ExtraFiles = append(execCmd.ExtraFiles, extraFiles...)
+ execCmd.Dir = c.execBundlePath(sessionID)
+ execCmd.SysProcAttr = &syscall.SysProcAttr{
+ Setpgid: true,
+ }
+
+ err = startCommandGivenSelinux(execCmd)
+
+ // We don't need children pipes on the parent side
+ errorhandling.CloseQuiet(childSyncPipe)
+ errorhandling.CloseQuiet(childAttachPipe)
+ errorhandling.CloseQuiet(childStartPipe)
+ childrenClosed = true
+
+ if err != nil {
+ return -1, nil, errors.Wrapf(err, "cannot start container %s", c.ID())
+ }
+ if err := r.moveConmonToCgroupAndSignal(c, execCmd, parentStartPipe, sessionID); err != nil {
+ return -1, nil, err
+ }
+
+ if options.PreserveFDs > 0 {
+ for fd := 3; fd < int(3+options.PreserveFDs); fd++ {
+ // These fds were passed down to the runtime. Close them
+ // and not interfere
+ if err := os.NewFile(uintptr(fd), fmt.Sprintf("fd-%d", fd)).Close(); err != nil {
+ logrus.Debugf("unable to close file fd-%d", fd)
+ }
+ }
+ }
+
+ // TODO Only create if !detach
+ // Attach to the container before starting it
+ attachChan := make(chan error)
+ go func() {
+ // attachToExec is responsible for closing pipes
+ attachChan <- c.attachToExec(options.Streams, options.DetachKeys, options.Resize, sessionID, parentStartPipe, parentAttachPipe)
+ close(attachChan)
+ }()
+ attachToExecCalled = true
+
+ pid, err := readConmonPipeData(parentSyncPipe, ociLog)
+
+ return pid, attachChan, err
+}
+
+// ExecStopContainer stops a given exec session in a running container.
+func (r *ConmonOCIRuntime) ExecStopContainer(ctr *Container, sessionID string, timeout uint) error {
+ session, ok := ctr.state.ExecSessions[sessionID]
+ if !ok {
+ // TODO This should probably be a separate error
+ return errors.Wrapf(define.ErrInvalidArg, "no exec session with ID %s found in container %s", sessionID, ctr.ID())
+ }
+
+ logrus.Debugf("Going to stop container %s exec session %s", ctr.ID(), sessionID)
+
+ // Is the session dead?
+ // Ping the PID with signal 0 to see if it still exists.
+ if err := unix.Kill(session.PID, 0); err != nil {
+ if err == unix.ESRCH {
+ return nil
+ }
+ return errors.Wrapf(err, "error pinging container %s exec session %s PID %d with signal 0", ctr.ID(), sessionID, session.PID)
+ }
+
+ if timeout > 0 {
+ // Use SIGTERM by default, then SIGSTOP after timeout.
+ logrus.Debugf("Killing exec session %s (PID %d) of container %s with SIGTERM", sessionID, session.PID, ctr.ID())
+ if err := unix.Kill(session.PID, unix.SIGTERM); err != nil {
+ if err == unix.ESRCH {
+ return nil
+ }
+ return errors.Wrapf(err, "error killing container %s exec session %s PID %d with SIGTERM", ctr.ID(), sessionID, session.PID)
+ }
+
+ // Wait for the PID to stop
+ if err := waitPidStop(session.PID, time.Duration(timeout)*time.Second); err != nil {
+ logrus.Warnf("Timed out waiting for container %s exec session %s to stop, resorting to SIGKILL", ctr.ID(), sessionID)
+ } else {
+ // No error, container is dead
+ return nil
+ }
+ }
+
+ // SIGTERM did not work. On to SIGKILL.
+ logrus.Debugf("Killing exec session %s (PID %d) of container %s with SIGKILL", sessionID, session.PID, ctr.ID())
+ if err := unix.Kill(session.PID, unix.SIGTERM); err != nil {
+ if err == unix.ESRCH {
+ return nil
+ }
+ return errors.Wrapf(err, "error killing container %s exec session %s PID %d with SIGKILL", ctr.ID(), sessionID, session.PID)
+ }
+
+ // Wait for the PID to stop
+ if err := waitPidStop(session.PID, killContainerTimeout*time.Second); err != nil {
+ return errors.Wrapf(err, "timed out waiting for container %s exec session %s PID %d to stop after SIGKILL", ctr.ID(), sessionID, session.PID)
+ }
+
+ return nil
+}
+
+// ExecCleanupContainer cleans up files created when a command is run via
+// ExecContainer. This includes the attach socket for the exec session.
+func (r *ConmonOCIRuntime) ExecContainerCleanup(ctr *Container, sessionID string) error {
+ // Clean up the sockets dir. Issue #3962
+ // Also ignore if it doesn't exist for some reason; hence the conditional return below
+ if err := os.RemoveAll(filepath.Join(r.socketsDir, sessionID)); err != nil && !os.IsNotExist(err) {
+ return err
+ }
+ return nil
+}
+
+// CheckpointContainer checkpoints the given container.
+func (r *ConmonOCIRuntime) CheckpointContainer(ctr *Container, options ContainerCheckpointOptions) error {
+ if err := label.SetSocketLabel(ctr.ProcessLabel()); err != nil {
+ return err
+ }
+ // imagePath is used by CRIU to store the actual checkpoint files
+ imagePath := ctr.CheckpointPath()
+ // 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)
+ args := []string{}
+ 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")
+ }
+ args = append(args, ctr.ID())
+ return utils.ExecCmdWithStdStreams(os.Stdin, os.Stdout, os.Stderr, nil, r.path, args...)
+}
+
+// SupportsCheckpoint checks if the OCI runtime supports checkpointing
+// containers.
+func (r *ConmonOCIRuntime) SupportsCheckpoint() bool {
+ // Check if the runtime implements checkpointing. Currently only
+ // runc's checkpoint/restore implementation is supported.
+ cmd := exec.Command(r.path, "checkpoint", "-h")
+ if err := cmd.Start(); err != nil {
+ return false
+ }
+ if err := cmd.Wait(); err == nil {
+ return true
+ }
+ return false
+}
+
+// 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
+}
+
+// AttachSocketPath is the path to a single container's attach socket.
+func (r *ConmonOCIRuntime) AttachSocketPath(ctr *Container) (string, error) {
+ if ctr == nil {
+ return "", errors.Wrapf(define.ErrInvalidArg, "must provide a valid container to get attach socket path")
+ }
+
+ return filepath.Join(r.socketsDir, ctr.ID(), "attach"), nil
+}
+
+// ExecAttachSocketPath is the path to a container's exec session attach socket.
+func (r *ConmonOCIRuntime) ExecAttachSocketPath(ctr *Container, sessionID string) (string, error) {
+ // We don't even use container, so don't validity check it
+ if sessionID == "" {
+ return "", errors.Wrapf(define.ErrInvalidArg, "must provide a valid session ID to get attach socket path")
+ }
+
+ return filepath.Join(r.socketsDir, sessionID, "attach"), nil
+}
+
+// ExitFilePath is the path to a container's exit file.
+func (r *ConmonOCIRuntime) ExitFilePath(ctr *Container) (string, error) {
+ if ctr == nil {
+ return "", errors.Wrapf(define.ErrInvalidArg, "must provide a valid container to get exit file path")
+ }
+ return filepath.Join(r.exitsDir, ctr.ID()), nil
+}
+
+// RuntimeInfo provides information on the runtime.
+func (r *ConmonOCIRuntime) RuntimeInfo() (map[string]interface{}, error) {
+ runtimePackage := packageVersion(r.path)
+ conmonPackage := packageVersion(r.conmonPath)
+ runtimeVersion, err := r.getOCIRuntimeVersion()
+ if err != nil {
+ return nil, errors.Wrapf(err, "error getting version of OCI runtime %s", r.name)
+ }
+ conmonVersion, err := r.getConmonVersion()
+ if err != nil {
+ return nil, errors.Wrapf(err, "error getting conmon version")
+ }
+
+ info := make(map[string]interface{})
+ info["Conmon"] = map[string]interface{}{
+ "path": r.conmonPath,
+ "package": conmonPackage,
+ "version": conmonVersion,
+ }
+ info["OCIRuntime"] = map[string]interface{}{
+ "path": r.path,
+ "package": runtimePackage,
+ "version": runtimeVersion,
+ }
+
+ return info, 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("Error 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 errors.Errorf("given PIDs did not die within timeout")
+ }
+}
+
+// createOCIContainer generates this container's main conmon instance and prepares it for starting
+func (r *ConmonOCIRuntime) createOCIContainer(ctr *Container, restoreOptions *ContainerCheckpointOptions) (err error) {
+ var stderrBuf bytes.Buffer
+
+ runtimeDir, err := util.GetRuntimeDir()
+ if err != nil {
+ return err
+ }
+
+ parentSyncPipe, childSyncPipe, err := newPipe()
+ if err != nil {
+ return errors.Wrapf(err, "error creating socket pair")
+ }
+ defer errorhandling.CloseQuiet(parentSyncPipe)
+
+ childStartPipe, parentStartPipe, err := newPipe()
+ if err != nil {
+ return errors.Wrapf(err, "error creating socket pair for start pipe")
+ }
+
+ defer errorhandling.CloseQuiet(parentStartPipe)
+
+ var ociLog string
+ if logrus.GetLevel() != logrus.DebugLevel && r.supportsJSON {
+ ociLog = filepath.Join(ctr.state.RunDir, "oci-log")
+ }
+ args := r.sharedConmonArgs(ctr, ctr.ID(), ctr.bundlePath(), filepath.Join(ctr.state.RunDir, "pidfile"), ctr.LogPath(), r.exitsDir, ociLog)
+
+ if ctr.config.Spec.Process.Terminal {
+ args = append(args, "-t")
+ } else if ctr.config.Stdin {
+ args = append(args, "-i")
+ }
+
+ if ctr.config.ConmonPidFile != "" {
+ args = append(args, "--conmon-pidfile", ctr.config.ConmonPidFile)
+ }
+
+ if r.noPivot {
+ args = append(args, "--no-pivot")
+ }
+
+ if len(ctr.config.ExitCommand) > 0 {
+ args = append(args, "--exit-command", ctr.config.ExitCommand[0])
+ for _, arg := range ctr.config.ExitCommand[1:] {
+ args = append(args, []string{"--exit-command-arg", arg}...)
+ }
+ }
+
+ if restoreOptions != nil {
+ args = append(args, "--restore", ctr.CheckpointPath())
+ if restoreOptions.TCPEstablished {
+ args = append(args, "--runtime-opt", "--tcp-established")
+ }
+ }
+
+ logrus.WithFields(logrus.Fields{
+ "args": args,
+ }).Debugf("running conmon: %s", r.conmonPath)
+
+ cmd := exec.Command(r.conmonPath, args...)
+ cmd.Dir = ctr.bundlePath()
+ 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, envFiles, err := r.configureConmonEnv(runtimeDir)
+ if err != nil {
+ return err
+ }
+
+ cmd.Env = append(r.conmonEnv, fmt.Sprintf("_OCI_SYNCPIPE=%d", 3), fmt.Sprintf("_OCI_STARTPIPE=%d", 4))
+ cmd.Env = append(cmd.Env, conmonEnv...)
+ cmd.ExtraFiles = append(cmd.ExtraFiles, childSyncPipe, childStartPipe)
+ cmd.ExtraFiles = append(cmd.ExtraFiles, envFiles...)
+
+ if r.reservePorts && !ctr.config.NetMode.IsSlirp4netns() {
+ ports, err := bindPorts(ctr.config.PortMappings)
+ if err != nil {
+ return err
+ }
+
+ // 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() {
+ if ctr.config.PostConfigureNetNS {
+ ctr.rootlessSlirpSyncR, ctr.rootlessSlirpSyncW, err = os.Pipe()
+ if err != nil {
+ return errors.Wrapf(err, "failed to create rootless network sync pipe")
+ }
+ } 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)
+ }
+
+ err = startCommandGivenSelinux(cmd)
+ // regardless of whether we errored or not, we no longer need the children pipes
+ childSyncPipe.Close()
+ childStartPipe.Close()
+ if err != nil {
+ return err
+ }
+ if err := r.moveConmonToCgroupAndSignal(ctr, cmd, parentStartPipe, ctr.ID()); err != nil {
+ return err
+ }
+ /* Wait for initial setup and fork, and reap child */
+ err = cmd.Wait()
+ if err != nil {
+ return err
+ }
+
+ pid, err := readConmonPipeData(parentSyncPipe, ociLog)
+ if err != nil {
+ if err2 := r.DeleteContainer(ctr); err2 != nil {
+ logrus.Errorf("Error removing container %s from runtime after creation failed", ctr.ID())
+ }
+ return err
+ }
+ ctr.state.PID = pid
+
+ conmonPID, err := readConmonPidFile(ctr.config.ConmonPidFile)
+ if err != nil {
+ logrus.Warnf("error reading conmon pid file for container %s: %s", ctr.ID(), err.Error())
+ } 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
+ }
+
+ return nil
+}
+
+// prepareProcessExec returns the path of the process.json used in runc exec -p
+// caller is responsible to close the returned *os.File if needed.
+func prepareProcessExec(c *Container, cmd, env []string, tty bool, cwd, user, sessionID string) (*os.File, error) {
+ f, err := ioutil.TempFile(c.execBundlePath(sessionID), "exec-process-")
+ if err != nil {
+ return nil, err
+ }
+
+ pspec := c.config.Spec.Process
+ pspec.Args = cmd
+ // We need to default this to false else it will inherit terminal as true
+ // from the container.
+ pspec.Terminal = false
+ if tty {
+ pspec.Terminal = true
+ }
+ if len(env) > 0 {
+ pspec.Env = append(pspec.Env, env...)
+ }
+
+ if cwd != "" {
+ pspec.Cwd = cwd
+
+ }
+
+ overrides := c.getUserOverrides()
+ execUser, err := lookup.GetUserGroupInfo(c.state.Mountpoint, user, overrides)
+ if err != nil {
+ return nil, err
+ }
+
+ // If user was set, look it up in the container to get a UID to use on
+ // the host
+ if user != "" {
+ sgids := make([]uint32, 0, len(execUser.Sgids))
+ for _, sgid := range execUser.Sgids {
+ sgids = append(sgids, uint32(sgid))
+ }
+ processUser := spec.User{
+ UID: uint32(execUser.Uid),
+ GID: uint32(execUser.Gid),
+ AdditionalGids: sgids,
+ }
+
+ pspec.User = processUser
+ }
+
+ hasHomeSet := false
+ for _, s := range pspec.Env {
+ if strings.HasPrefix(s, "HOME=") {
+ hasHomeSet = true
+ break
+ }
+ }
+ if !hasHomeSet {
+ pspec.Env = append(pspec.Env, fmt.Sprintf("HOME=%s", execUser.Home))
+ }
+
+ processJSON, err := json.Marshal(pspec)
+ if err != nil {
+ return nil, err
+ }
+
+ if err := ioutil.WriteFile(f.Name(), processJSON, 0644); err != nil {
+ return nil, err
+ }
+ return f, 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, []*os.File, error) {
+ env := make([]string, 0, 6)
+ 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, err := homeDir()
+ if err != nil {
+ return nil, nil, err
+ }
+ env = append(env, fmt.Sprintf("HOME=%s", home))
+
+ extraFiles := make([]*os.File, 0)
+ if notify, ok := os.LookupEnv("NOTIFY_SOCKET"); ok {
+ env = append(env, fmt.Sprintf("NOTIFY_SOCKET=%s", notify))
+ }
+ if !r.sdNotify {
+ if listenfds, ok := os.LookupEnv("LISTEN_FDS"); ok {
+ env = append(env, fmt.Sprintf("LISTEN_FDS=%s", listenfds), "LISTEN_PID=1")
+ fds := activation.Files(false)
+ extraFiles = append(extraFiles, fds...)
+ }
+ } else {
+ logrus.Debug("disabling SD notify")
+ }
+ return env, extraFiles, nil
+}
+
+// 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 string) []string {
+ // set the conmon API version to be able to use the correct sync struct keys
+ args := []string{"--api-version", "1"}
+ if r.cgroupManager == SystemdCgroupsManager && !ctr.config.NoCgroups {
+ args = append(args, "-s")
+ }
+ args = append(args, "-c", ctr.ID())
+ args = append(args, "-u", cuuid)
+ args = append(args, "-r", r.path)
+ args = append(args, "-b", bundlePath)
+ args = append(args, "-p", pidPath)
+
+ var logDriver string
+ switch ctr.LogDriver() {
+ case JournaldLogging:
+ logDriver = JournaldLogging
+ case JSONLogging:
+ fallthrough
+ default: //nolint-stylecheck
+ // 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 KubernetesLogging:
+ logDriver = fmt.Sprintf("%s:%s", KubernetesLogging, logPath)
+ }
+
+ args = append(args, "-l", logDriver)
+ args = append(args, "--exit-dir", exitDir)
+ args = append(args, "--socket-dir-path", r.socketsDir)
+ if r.logSizeMax >= 0 {
+ args = append(args, "--log-size-max", fmt.Sprintf("%v", r.logSizeMax))
+ }
+
+ 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")
+ }
+ if ociLogPath != "" {
+ args = append(args, "--runtime-arg", "--log-format=json", "--runtime-arg", "--log", fmt.Sprintf("--runtime-arg=%s", ociLogPath))
+ }
+ if ctr.config.NoCgroups {
+ logrus.Debugf("Running with no CGroups")
+ args = append(args, "--runtime-arg", "--cgroup-manager", "--runtime-arg", "disabled")
+ }
+ return args
+}
+
+// startCommandGivenSelinux starts a container ensuring to set the labels of
+// the process to make sure SELinux doesn't block conmon communication, if SELinux is enabled
+func startCommandGivenSelinux(cmd *exec.Cmd) error {
+ if !selinux.GetEnabled() {
+ return cmd.Start()
+ }
+ // Set the label of the conmon process to be level :s0
+ // This will allow the container processes to talk to fifo-files
+ // passed into the container by conmon
+ var (
+ plabel string
+ con selinux.Context
+ err error
+ )
+ plabel, err = selinux.CurrentLabel()
+ if err != nil {
+ return errors.Wrapf(err, "Failed to get current SELinux label")
+ }
+
+ con, err = selinux.NewContext(plabel)
+ if err != nil {
+ return errors.Wrapf(err, "Failed to get new context from SELinux label")
+ }
+
+ runtime.LockOSThread()
+ if con["level"] != "s0" && con["level"] != "" {
+ con["level"] = "s0"
+ if err = label.SetProcessLabel(con.Get()); err != nil {
+ runtime.UnlockOSThread()
+ return err
+ }
+ }
+ err = cmd.Start()
+ // Ignore error returned from SetProcessLabel("") call,
+ // can't recover.
+ if labelErr := label.SetProcessLabel(""); labelErr != nil {
+ logrus.Errorf("unable to set process label: %q", err)
+ }
+ runtime.UnlockOSThread()
+ return err
+}
+
+// moveConmonToCgroupAndSignal gets a container's cgroupParent and moves the conmon process to that cgroup
+// it then signals for conmon to start by sending nonse data down the start fd
+func (r *ConmonOCIRuntime) moveConmonToCgroupAndSignal(ctr *Container, cmd *exec.Cmd, startFd *os.File, uuid string) error {
+ mustCreateCgroup := true
+ // If cgroup creation is disabled - just signal.
+ if ctr.config.NoCgroups {
+ mustCreateCgroup = false
+ }
+
+ if rootless.IsRootless() {
+ ownsCgroup, err := cgroups.UserOwnsCurrentSystemdCgroup()
+ if err != nil {
+ return err
+ }
+ mustCreateCgroup = !ownsCgroup
+ }
+
+ if mustCreateCgroup {
+ cgroupParent := ctr.CgroupParent()
+ if r.cgroupManager == 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.Warnf("Failed to add conmon to systemd sandbox cgroup: %v", err)
+ }
+ } else {
+ cgroupPath := filepath.Join(ctr.config.CgroupParent, "conmon")
+ control, err := cgroups.New(cgroupPath, &spec.LinuxResources{})
+ if err != nil {
+ logrus.Warnf("Failed to add conmon to cgroupfs sandbox cgroup: %v", err)
+ } else {
+ // we need to remove this defer and delete the cgroup once conmon exits
+ // maybe need a conmon monitor?
+ if err := control.AddPid(cmd.Process.Pid); err != nil {
+ logrus.Warnf("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
+func newPipe() (parent *os.File, child *os.File, err 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(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')
+ if err != nil {
+ ch <- syncStruct{err: err}
+ }
+ if err := json.Unmarshal(b, &si); err != nil {
+ ch <- syncStruct{err: err}
+ return
+ }
+ ch <- syncStruct{si: si}
+ }()
+
+ data := -1
+ 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(ociErr.Msg)
+ }
+ }
+ }
+ return -1, errors.Wrapf(ss.err, "error reading container (probably exited) json message")
+ }
+ 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(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(ss.si.Message)
+ }
+ return ss.si.Data, errors.Wrapf(define.ErrInternal, "container create failed")
+ }
+ data = ss.si.Data
+ case <-time.After(ContainerCreateTimeout):
+ return -1, errors.Wrapf(define.ErrInternal, "container creation timeout")
+ }
+ return data, nil
+}
+
+// writeConmonPipeData writes nonse 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
+}
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-11-15 21:29:18 +0000