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//go:build !windows
// +build !windows
/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package process
import (
"context"
"errors"
"fmt"
runc "github.com/containerd/go-runc"
google_protobuf "github.com/gogo/protobuf/types"
"github.com/sirupsen/logrus"
)
type initState interface {
Start(context.Context) error
Delete(context.Context) error
Pause(context.Context) error
Resume(context.Context) error
Update(context.Context, *google_protobuf.Any) error
Checkpoint(context.Context, *CheckpointConfig) error
Exec(context.Context, string, *ExecConfig) (Process, error)
Kill(context.Context, uint32, bool) error
SetExited(int)
Status(context.Context) (string, error)
}
type createdState struct {
p *Init
}
func (s *createdState) transition(name string) error {
switch name {
case "running":
s.p.initState = &runningState{p: s.p}
case "stopped":
s.p.initState = &stoppedState{p: s.p}
case "deleted":
s.p.initState = &deletedState{}
default:
return fmt.Errorf("invalid state transition %q to %q", stateName(s), name)
}
return nil
}
func (s *createdState) Pause(ctx context.Context) error {
return errors.New("cannot pause task in created state")
}
func (s *createdState) Resume(ctx context.Context) error {
return errors.New("cannot resume task in created state")
}
func (s *createdState) Update(ctx context.Context, r *google_protobuf.Any) error {
return s.p.update(ctx, r)
}
func (s *createdState) Checkpoint(ctx context.Context, r *CheckpointConfig) error {
return errors.New("cannot checkpoint a task in created state")
}
func (s *createdState) Start(ctx context.Context) error {
if err := s.p.start(ctx); err != nil {
return err
}
return s.transition("running")
}
func (s *createdState) Delete(ctx context.Context) error {
if err := s.p.delete(ctx); err != nil {
return err
}
return s.transition("deleted")
}
func (s *createdState) Kill(ctx context.Context, sig uint32, all bool) error {
return s.p.kill(ctx, sig, all)
}
func (s *createdState) SetExited(status int) {
s.p.setExited(status)
if err := s.transition("stopped"); err != nil {
panic(err)
}
}
func (s *createdState) Exec(ctx context.Context, path string, r *ExecConfig) (Process, error) {
return s.p.exec(ctx, path, r)
}
func (s *createdState) Status(ctx context.Context) (string, error) {
return "created", nil
}
type createdCheckpointState struct {
p *Init
opts *runc.RestoreOpts
}
func (s *createdCheckpointState) transition(name string) error {
switch name {
case "running":
s.p.initState = &runningState{p: s.p}
case "stopped":
s.p.initState = &stoppedState{p: s.p}
case "deleted":
s.p.initState = &deletedState{}
default:
return fmt.Errorf("invalid state transition %q to %q", stateName(s), name)
}
return nil
}
func (s *createdCheckpointState) Pause(ctx context.Context) error {
return errors.New("cannot pause task in created state")
}
func (s *createdCheckpointState) Resume(ctx context.Context) error {
return errors.New("cannot resume task in created state")
}
func (s *createdCheckpointState) Update(ctx context.Context, r *google_protobuf.Any) error {
return s.p.update(ctx, r)
}
func (s *createdCheckpointState) Checkpoint(ctx context.Context, r *CheckpointConfig) error {
return errors.New("cannot checkpoint a task in created state")
}
func (s *createdCheckpointState) Start(ctx context.Context) error {
p := s.p
sio := p.stdio
var (
err error
socket *runc.Socket
)
if sio.Terminal {
if socket, err = runc.NewTempConsoleSocket(); err != nil {
return fmt.Errorf("failed to create OCI runtime console socket: %w", err)
}
defer socket.Close()
s.opts.ConsoleSocket = socket
}
if _, err := s.p.runtime.Restore(ctx, p.id, p.Bundle, s.opts); err != nil {
return p.runtimeError(err, "OCI runtime restore failed")
}
if sio.Stdin != "" {
if err := p.openStdin(sio.Stdin); err != nil {
return fmt.Errorf("failed to open stdin fifo %s: %w", sio.Stdin, err)
}
}
if socket != nil {
console, err := socket.ReceiveMaster()
if err != nil {
return fmt.Errorf("failed to retrieve console master: %w", err)
}
console, err = p.Platform.CopyConsole(ctx, console, p.id, sio.Stdin, sio.Stdout, sio.Stderr, &p.wg)
if err != nil {
return fmt.Errorf("failed to start console copy: %w", err)
}
p.console = console
} else {
if err := p.io.Copy(ctx, &p.wg); err != nil {
return fmt.Errorf("failed to start io pipe copy: %w", err)
}
}
pid, err := runc.ReadPidFile(s.opts.PidFile)
if err != nil {
return fmt.Errorf("failed to retrieve OCI runtime container pid: %w", err)
}
p.pid = pid
return s.transition("running")
}
func (s *createdCheckpointState) Delete(ctx context.Context) error {
if err := s.p.delete(ctx); err != nil {
return err
}
return s.transition("deleted")
}
func (s *createdCheckpointState) Kill(ctx context.Context, sig uint32, all bool) error {
return s.p.kill(ctx, sig, all)
}
func (s *createdCheckpointState) SetExited(status int) {
s.p.setExited(status)
if err := s.transition("stopped"); err != nil {
panic(err)
}
}
func (s *createdCheckpointState) Exec(ctx context.Context, path string, r *ExecConfig) (Process, error) {
return nil, errors.New("cannot exec in a created state")
}
func (s *createdCheckpointState) Status(ctx context.Context) (string, error) {
return "created", nil
}
type runningState struct {
p *Init
}
func (s *runningState) transition(name string) error {
switch name {
case "stopped":
s.p.initState = &stoppedState{p: s.p}
case "paused":
s.p.initState = &pausedState{p: s.p}
default:
return fmt.Errorf("invalid state transition %q to %q", stateName(s), name)
}
return nil
}
func (s *runningState) Pause(ctx context.Context) error {
s.p.pausing.set(true)
// NOTE "pausing" will be returned in the short window
// after `transition("paused")`, before `pausing` is reset
// to false. That doesn't break the state machine, just
// delays the "paused" state a little bit.
defer s.p.pausing.set(false)
if err := s.p.runtime.Pause(ctx, s.p.id); err != nil {
return s.p.runtimeError(err, "OCI runtime pause failed")
}
return s.transition("paused")
}
func (s *runningState) Resume(ctx context.Context) error {
return errors.New("cannot resume a running process")
}
func (s *runningState) Update(ctx context.Context, r *google_protobuf.Any) error {
return s.p.update(ctx, r)
}
func (s *runningState) Checkpoint(ctx context.Context, r *CheckpointConfig) error {
return s.p.checkpoint(ctx, r)
}
func (s *runningState) Start(ctx context.Context) error {
return errors.New("cannot start a running process")
}
func (s *runningState) Delete(ctx context.Context) error {
return errors.New("cannot delete a running process")
}
func (s *runningState) Kill(ctx context.Context, sig uint32, all bool) error {
return s.p.kill(ctx, sig, all)
}
func (s *runningState) SetExited(status int) {
s.p.setExited(status)
if err := s.transition("stopped"); err != nil {
panic(err)
}
}
func (s *runningState) Exec(ctx context.Context, path string, r *ExecConfig) (Process, error) {
return s.p.exec(ctx, path, r)
}
func (s *runningState) Status(ctx context.Context) (string, error) {
return "running", nil
}
type pausedState struct {
p *Init
}
func (s *pausedState) transition(name string) error {
switch name {
case "running":
s.p.initState = &runningState{p: s.p}
case "stopped":
s.p.initState = &stoppedState{p: s.p}
default:
return fmt.Errorf("invalid state transition %q to %q", stateName(s), name)
}
return nil
}
func (s *pausedState) Pause(ctx context.Context) error {
return errors.New("cannot pause a paused container")
}
func (s *pausedState) Resume(ctx context.Context) error {
if err := s.p.runtime.Resume(ctx, s.p.id); err != nil {
return s.p.runtimeError(err, "OCI runtime resume failed")
}
return s.transition("running")
}
func (s *pausedState) Update(ctx context.Context, r *google_protobuf.Any) error {
return s.p.update(ctx, r)
}
func (s *pausedState) Checkpoint(ctx context.Context, r *CheckpointConfig) error {
return s.p.checkpoint(ctx, r)
}
func (s *pausedState) Start(ctx context.Context) error {
return errors.New("cannot start a paused process")
}
func (s *pausedState) Delete(ctx context.Context) error {
return errors.New("cannot delete a paused process")
}
func (s *pausedState) Kill(ctx context.Context, sig uint32, all bool) error {
return s.p.kill(ctx, sig, all)
}
func (s *pausedState) SetExited(status int) {
s.p.setExited(status)
if err := s.p.runtime.Resume(context.Background(), s.p.id); err != nil {
logrus.WithError(err).Error("resuming exited container from paused state")
}
if err := s.transition("stopped"); err != nil {
panic(err)
}
}
func (s *pausedState) Exec(ctx context.Context, path string, r *ExecConfig) (Process, error) {
return nil, errors.New("cannot exec in a paused state")
}
func (s *pausedState) Status(ctx context.Context) (string, error) {
return "paused", nil
}
type stoppedState struct {
p *Init
}
func (s *stoppedState) transition(name string) error {
switch name {
case "deleted":
s.p.initState = &deletedState{}
default:
return fmt.Errorf("invalid state transition %q to %q", stateName(s), name)
}
return nil
}
func (s *stoppedState) Pause(ctx context.Context) error {
return errors.New("cannot pause a stopped container")
}
func (s *stoppedState) Resume(ctx context.Context) error {
return errors.New("cannot resume a stopped container")
}
func (s *stoppedState) Update(ctx context.Context, r *google_protobuf.Any) error {
return errors.New("cannot update a stopped container")
}
func (s *stoppedState) Checkpoint(ctx context.Context, r *CheckpointConfig) error {
return errors.New("cannot checkpoint a stopped container")
}
func (s *stoppedState) Start(ctx context.Context) error {
return errors.New("cannot start a stopped process")
}
func (s *stoppedState) Delete(ctx context.Context) error {
if err := s.p.delete(ctx); err != nil {
return err
}
return s.transition("deleted")
}
func (s *stoppedState) Kill(ctx context.Context, sig uint32, all bool) error {
return s.p.kill(ctx, sig, all)
}
func (s *stoppedState) SetExited(status int) {
// no op
}
func (s *stoppedState) Exec(ctx context.Context, path string, r *ExecConfig) (Process, error) {
return nil, errors.New("cannot exec in a stopped state")
}
func (s *stoppedState) Status(ctx context.Context) (string, error) {
return "stopped", nil
}