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// Copyright 2018 The containerd Authors.
// Copyright 2018 The gVisor 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
//
// https://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 proc
import (
"context"
"fmt"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/pkg/process"
runc "github.com/containerd/go-runc"
"golang.org/x/sys/unix"
)
type stateTransition int
const (
running stateTransition = iota
stopped
deleted
)
func (s stateTransition) String() string {
switch s {
case running:
return "running"
case stopped:
return "stopped"
case deleted:
return "deleted"
default:
panic(fmt.Sprintf("unknown state: %d", s))
}
}
type initState interface {
Start(context.Context) error
Delete(context.Context) error
Exec(context.Context, string, *ExecConfig) (process.Process, error)
State(ctx context.Context) (string, error)
Stats(context.Context, string) (*runc.Stats, error)
Kill(context.Context, uint32, bool) error
SetExited(int)
}
type createdState struct {
p *Init
}
func (s *createdState) name() string {
return "created"
}
func (s *createdState) transition(transition stateTransition) {
switch transition {
case running:
s.p.initState = &runningState{p: s.p}
case stopped:
s.p.initState = &stoppedState{process: s.p}
case deleted:
s.p.initState = &deletedState{}
default:
panic(fmt.Sprintf("invalid state transition %q to %q", s.name(), transition))
}
}
func (s *createdState) Start(ctx context.Context) error {
if err := s.p.start(ctx); err != nil {
// Containerd doesn't allow deleting container in created state.
// However, for gvisor, a non-root container in created state can
// only go to running state. If the container can't be started,
// it can only stay in created state, and never be deleted.
// To work around that, we treat non-root container in start failure
// state as stopped.
if !s.p.Sandbox {
s.p.io.Close()
s.p.setExited(internalErrorCode)
s.transition(stopped)
}
return err
}
s.transition(running)
return nil
}
func (s *createdState) Delete(ctx context.Context) error {
if err := s.p.delete(ctx); err != nil {
return err
}
s.transition(deleted)
return nil
}
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)
s.transition(stopped)
}
func (s *createdState) Exec(ctx context.Context, path string, r *ExecConfig) (process.Process, error) {
return s.p.exec(path, r)
}
func (s *createdState) State(ctx context.Context) (string, error) {
state, err := s.p.state(ctx)
if err == nil && state == statusStopped {
s.transition(stopped)
}
return state, err
}
func (s *createdState) Stats(ctx context.Context, id string) (*runc.Stats, error) {
return s.p.stats(ctx, id)
}
type runningState struct {
p *Init
}
func (s *runningState) name() string {
return "running"
}
func (s *runningState) transition(transition stateTransition) {
switch transition {
case stopped:
s.p.initState = &stoppedState{process: s.p}
default:
panic(fmt.Sprintf("invalid state transition %q to %q", s.name(), transition))
}
}
func (s *runningState) Start(ctx context.Context) error {
return fmt.Errorf("cannot start a running container")
}
func (s *runningState) Delete(ctx context.Context) error {
return fmt.Errorf("cannot delete a running container")
}
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)
s.transition(stopped)
}
func (s *runningState) Exec(_ context.Context, path string, r *ExecConfig) (process.Process, error) {
return s.p.exec(path, r)
}
func (s *runningState) State(ctx context.Context) (string, error) {
state, err := s.p.state(ctx)
if err == nil && state == "stopped" {
s.transition(stopped)
}
return state, err
}
func (s *runningState) Stats(ctx context.Context, id string) (*runc.Stats, error) {
return s.p.stats(ctx, id)
}
type stoppedState struct {
process *Init
}
func (s *stoppedState) name() string {
return "stopped"
}
func (s *stoppedState) transition(transition stateTransition) {
switch transition {
case deleted:
s.process.initState = &deletedState{}
default:
panic(fmt.Sprintf("invalid state transition %q to %q", s.name(), transition))
}
}
func (s *stoppedState) Start(context.Context) error {
return fmt.Errorf("cannot start a stopped container")
}
func (s *stoppedState) Delete(ctx context.Context) error {
if err := s.process.delete(ctx); err != nil {
return err
}
s.transition(deleted)
return nil
}
func (s *stoppedState) Kill(_ context.Context, signal uint32, _ bool) error {
return handleStoppedKill(signal)
}
func (s *stoppedState) SetExited(status int) {
s.process.setExited(status)
}
func (s *stoppedState) Exec(context.Context, string, *ExecConfig) (process.Process, error) {
return nil, fmt.Errorf("cannot exec in a stopped state")
}
func (s *stoppedState) State(context.Context) (string, error) {
return "stopped", nil
}
func (s *stoppedState) Stats(context.Context, string) (*runc.Stats, error) {
return nil, fmt.Errorf("cannot stat a stopped container")
}
func handleStoppedKill(signal uint32) error {
switch unix.Signal(signal) {
case unix.SIGTERM, unix.SIGKILL:
// Container is already stopped, so everything inside the container has
// already been killed.
return nil
default:
return errdefs.ToGRPCf(errdefs.ErrNotFound, "process not found")
}
}
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