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init.go
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init.go
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// +build !windows
package shim
import (
"context"
"encoding/json"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"sync"
"syscall"
"time"
"golang.org/x/sys/unix"
"github.com/containerd/console"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/identifiers"
"github.com/containerd/containerd/linux/runcopts"
shimapi "github.com/containerd/containerd/linux/shim/v1"
"github.com/containerd/containerd/log"
"github.com/containerd/containerd/mount"
"github.com/containerd/containerd/typeurl"
"github.com/containerd/fifo"
runc "github.com/containerd/go-runc"
specs "github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
)
type initProcess struct {
sync.WaitGroup
// mu is used to ensure that `Start()` and `Exited()` calls return in
// the right order when invoked in separate go routines.
// This is the case within the shim implementation as it makes use of
// the reaper interface.
mu sync.Mutex
id string
bundle string
console console.Console
io runc.IO
runtime *runc.Runc
status int
exited time.Time
pid int
closers []io.Closer
stdin io.Closer
stdio stdio
}
func newInitProcess(context context.Context, path, namespace string, r *shimapi.CreateTaskRequest) (*initProcess, error) {
if err := identifiers.Validate(r.ID); err != nil {
return nil, errors.Wrapf(err, "invalid task id")
}
var options runcopts.CreateOptions
if r.Options != nil {
v, err := typeurl.UnmarshalAny(r.Options)
if err != nil {
return nil, err
}
options = *v.(*runcopts.CreateOptions)
}
for _, rm := range r.Rootfs {
m := &mount.Mount{
Type: rm.Type,
Source: rm.Source,
Options: rm.Options,
}
if err := m.Mount(filepath.Join(path, "rootfs")); err != nil {
return nil, errors.Wrapf(err, "failed to mount rootfs component %v", m)
}
}
runtime := &runc.Runc{
Command: r.Runtime,
Log: filepath.Join(path, "log.json"),
LogFormat: runc.JSON,
PdeathSignal: syscall.SIGKILL,
Root: filepath.Join(RuncRoot, namespace),
}
p := &initProcess{
id: r.ID,
bundle: r.Bundle,
runtime: runtime,
stdio: stdio{
stdin: r.Stdin,
stdout: r.Stdout,
stderr: r.Stderr,
terminal: r.Terminal,
},
}
var (
err error
socket *runc.Socket
io runc.IO
)
if r.Terminal {
if socket, err = runc.NewConsoleSocket(filepath.Join(path, "pty.sock")); err != nil {
return nil, errors.Wrap(err, "failed to create OCI runtime console socket")
}
defer os.Remove(socket.Path())
} else {
// TODO: get uid/gid
if io, err = runc.NewPipeIO(0, 0); err != nil {
return nil, errors.Wrap(err, "failed to create OCI runtime io pipes")
}
p.io = io
}
pidFile := filepath.Join(path, "init.pid")
if r.Checkpoint != "" {
opts := &runc.RestoreOpts{
CheckpointOpts: runc.CheckpointOpts{
ImagePath: r.Checkpoint,
WorkDir: filepath.Join(r.Bundle, "work"),
ParentPath: r.ParentCheckpoint,
},
PidFile: pidFile,
IO: io,
NoPivot: options.NoPivotRoot,
Detach: true,
NoSubreaper: true,
}
if _, err := p.runtime.Restore(context, r.ID, r.Bundle, opts); err != nil {
return nil, p.runtimeError(err, "OCI runtime restore failed")
}
} else {
opts := &runc.CreateOpts{
PidFile: pidFile,
IO: io,
NoPivot: options.NoPivotRoot,
NoNewKeyring: options.NoNewKeyring,
}
if socket != nil {
opts.ConsoleSocket = socket
}
if err := p.runtime.Create(context, r.ID, r.Bundle, opts); err != nil {
return nil, p.runtimeError(err, "OCI runtime create failed")
}
}
if r.Stdin != "" {
sc, err := fifo.OpenFifo(context, r.Stdin, syscall.O_WRONLY|syscall.O_NONBLOCK, 0)
if err != nil {
return nil, errors.Wrapf(err, "failed to open stdin fifo %s", r.Stdin)
}
p.stdin = sc
p.closers = append(p.closers, sc)
}
var copyWaitGroup sync.WaitGroup
if socket != nil {
console, err := socket.ReceiveMaster()
if err != nil {
return nil, errors.Wrap(err, "failed to retrieve console master")
}
p.console = console
if err := copyConsole(context, console, r.Stdin, r.Stdout, r.Stderr, &p.WaitGroup, ©WaitGroup); err != nil {
return nil, errors.Wrap(err, "failed to start console copy")
}
} else {
if err := copyPipes(context, io, r.Stdin, r.Stdout, r.Stderr, &p.WaitGroup, ©WaitGroup); err != nil {
return nil, errors.Wrap(err, "failed to start io pipe copy")
}
}
copyWaitGroup.Wait()
pid, err := runc.ReadPidFile(pidFile)
if err != nil {
return nil, errors.Wrap(err, "failed to retrieve OCI runtime container pid")
}
p.pid = pid
return p, nil
}
func (p *initProcess) ID() string {
return p.id
}
func (p *initProcess) Pid() int {
return p.pid
}
func (p *initProcess) Status() int {
return p.status
}
func (p *initProcess) ExitedAt() time.Time {
return p.exited
}
// ContainerStatus return the state of the container (created, running, paused, stopped)
func (p *initProcess) ContainerStatus(ctx context.Context) (string, error) {
c, err := p.runtime.State(ctx, p.id)
if err != nil {
return "", p.runtimeError(err, "OCI runtime state failed")
}
return c.Status, nil
}
func (p *initProcess) Start(context context.Context) error {
p.mu.Lock()
defer p.mu.Unlock()
err := p.runtime.Start(context, p.id)
return p.runtimeError(err, "OCI runtime start failed")
}
func (p *initProcess) Exited(status int) {
p.mu.Lock()
p.status = status
p.exited = time.Now()
p.mu.Unlock()
}
func (p *initProcess) Delete(context context.Context) error {
status, err := p.ContainerStatus(context)
if err != nil {
return err
}
if status != "stopped" {
return fmt.Errorf("cannot delete a running container")
}
p.killAll(context)
p.Wait()
err = p.runtime.Delete(context, p.id, nil)
if p.io != nil {
for _, c := range p.closers {
c.Close()
}
p.io.Close()
}
return p.runtimeError(err, "OCI runtime delete failed")
}
func (p *initProcess) Resize(ws console.WinSize) error {
if p.console == nil {
return nil
}
return p.console.Resize(ws)
}
func (p *initProcess) Pause(context context.Context) error {
err := p.runtime.Pause(context, p.id)
return p.runtimeError(err, "OCI runtime pause failed")
}
func (p *initProcess) Resume(context context.Context) error {
err := p.runtime.Resume(context, p.id)
return p.runtimeError(err, "OCI runtime resume failed")
}
func (p *initProcess) Kill(context context.Context, signal uint32, all bool) error {
err := p.runtime.Kill(context, p.id, int(signal), &runc.KillOpts{
All: all,
})
return checkKillError(err)
}
func (p *initProcess) killAll(context context.Context) error {
err := p.runtime.Kill(context, p.id, int(syscall.SIGKILL), &runc.KillOpts{
All: true,
})
return p.runtimeError(err, "OCI runtime killall failed")
}
func (p *initProcess) Stdin() io.Closer {
return p.stdin
}
func (p *initProcess) Checkpoint(context context.Context, r *shimapi.CheckpointTaskRequest) error {
var options runcopts.CheckpointOptions
if r.Options != nil {
v, err := typeurl.UnmarshalAny(r.Options)
if err != nil {
return err
}
options = *v.(*runcopts.CheckpointOptions)
}
var actions []runc.CheckpointAction
if !options.Exit {
actions = append(actions, runc.LeaveRunning)
}
work := filepath.Join(p.bundle, "work")
defer os.RemoveAll(work)
if err := p.runtime.Checkpoint(context, p.id, &runc.CheckpointOpts{
WorkDir: work,
ImagePath: r.Path,
AllowOpenTCP: options.OpenTcp,
AllowExternalUnixSockets: options.ExternalUnixSockets,
AllowTerminal: options.Terminal,
FileLocks: options.FileLocks,
EmptyNamespaces: options.EmptyNamespaces,
}, actions...); err != nil {
dumpLog := filepath.Join(p.bundle, "criu-dump.log")
if cerr := copyFile(dumpLog, filepath.Join(work, "dump.log")); cerr != nil {
log.G(context).Error(err)
}
return fmt.Errorf("%s path= %s", criuError(err), dumpLog)
}
return nil
}
func (p *initProcess) Update(context context.Context, r *shimapi.UpdateTaskRequest) error {
var resources specs.LinuxResources
if err := json.Unmarshal(r.Resources.Value, &resources); err != nil {
return err
}
return p.runtime.Update(context, p.id, &resources)
}
func (p *initProcess) Stdio() stdio {
return p.stdio
}
// TODO(mlaventure): move to runc package?
func getLastRuntimeError(r *runc.Runc) (string, error) {
if r.Log == "" {
return "", nil
}
f, err := os.OpenFile(r.Log, os.O_RDONLY, 0400)
if err != nil {
return "", err
}
var (
errMsg string
log struct {
Level string
Msg string
Time time.Time
}
)
dec := json.NewDecoder(f)
for err = nil; err == nil; {
if err = dec.Decode(&log); err != nil && err != io.EOF {
return "", err
}
if log.Level == "error" {
errMsg = strings.TrimSpace(log.Msg)
}
}
return errMsg, nil
}
func (p *initProcess) runtimeError(rErr error, msg string) error {
if rErr == nil {
return nil
}
rMsg, err := getLastRuntimeError(p.runtime)
switch {
case err != nil:
return errors.Wrapf(rErr, "%s: %s (%s)", msg, "unable to retrieve OCI runtime error", err.Error())
case rMsg == "":
return errors.Wrap(rErr, msg)
default:
return errors.Errorf("%s: %s", msg, rMsg)
}
}
// criuError returns only the first line of the error message from criu
// it tries to add an invalid dump log location when returning the message
func criuError(err error) string {
parts := strings.Split(err.Error(), "\n")
return parts[0]
}
func copyFile(to, from string) error {
ff, err := os.Open(from)
if err != nil {
return err
}
defer ff.Close()
tt, err := os.Create(to)
if err != nil {
return err
}
defer tt.Close()
_, err = io.Copy(tt, ff)
return err
}
func checkKillError(err error) error {
if err == nil {
return nil
}
if strings.Contains(err.Error(), "os: process already finished") || err == unix.ESRCH {
return errors.Wrapf(errdefs.ErrNotFound, "process already finished")
}
return errors.Wrapf(err, "unknown error after kill")
}