523 lines
12 KiB
Go
523 lines
12 KiB
Go
// +build !windows
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/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package proc
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import (
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"context"
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"sync"
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"syscall"
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"github.com/containerd/console"
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"github.com/containerd/containerd/errdefs"
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"github.com/containerd/fifo"
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runc "github.com/containerd/go-runc"
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google_protobuf "github.com/gogo/protobuf/types"
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"github.com/pkg/errors"
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)
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type initState interface {
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State
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Pause(context.Context) error
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Resume(context.Context) error
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Update(context.Context, *google_protobuf.Any) error
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Checkpoint(context.Context, *CheckpointConfig) error
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Exec(context.Context, string, *ExecConfig) (Process, error)
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}
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type createdState struct {
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p *Init
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}
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func (s *createdState) transition(name string) error {
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switch name {
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case "running":
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s.p.initState = &runningState{p: s.p}
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case "stopped":
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s.p.initState = &stoppedState{p: s.p}
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case "deleted":
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s.p.initState = &deletedState{}
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default:
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return errors.Errorf("invalid state transition %q to %q", stateName(s), name)
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}
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return nil
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}
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func (s *createdState) Pause(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot pause task in created state")
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}
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func (s *createdState) Resume(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot resume task in created state")
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}
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func (s *createdState) Update(context context.Context, r *google_protobuf.Any) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.update(context, r)
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}
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func (s *createdState) Checkpoint(context context.Context, r *CheckpointConfig) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot checkpoint a task in created state")
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}
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func (s *createdState) Resize(ws console.WinSize) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.resize(ws)
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}
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func (s *createdState) Start(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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if err := s.p.start(ctx); err != nil {
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return err
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}
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return s.transition("running")
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}
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func (s *createdState) Delete(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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if err := s.p.delete(ctx); err != nil {
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return err
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}
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return s.transition("deleted")
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}
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func (s *createdState) Kill(ctx context.Context, sig uint32, all bool) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.kill(ctx, sig, all)
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}
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func (s *createdState) SetExited(status int) {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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s.p.setExited(status)
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if err := s.transition("stopped"); err != nil {
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panic(err)
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}
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}
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func (s *createdState) Exec(ctx context.Context, path string, r *ExecConfig) (Process, error) {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.exec(ctx, path, r)
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}
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type createdCheckpointState struct {
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p *Init
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opts *runc.RestoreOpts
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}
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func (s *createdCheckpointState) transition(name string) error {
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switch name {
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case "running":
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s.p.initState = &runningState{p: s.p}
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case "stopped":
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s.p.initState = &stoppedState{p: s.p}
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case "deleted":
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s.p.initState = &deletedState{}
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default:
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return errors.Errorf("invalid state transition %q to %q", stateName(s), name)
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}
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return nil
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}
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func (s *createdCheckpointState) Pause(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot pause task in created state")
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}
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func (s *createdCheckpointState) Resume(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot resume task in created state")
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}
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func (s *createdCheckpointState) Update(context context.Context, r *google_protobuf.Any) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.update(context, r)
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}
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func (s *createdCheckpointState) Checkpoint(context context.Context, r *CheckpointConfig) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot checkpoint a task in created state")
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}
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func (s *createdCheckpointState) Resize(ws console.WinSize) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.resize(ws)
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}
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func (s *createdCheckpointState) Start(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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p := s.p
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if _, err := s.p.runtime.Restore(ctx, p.id, p.bundle, s.opts); err != nil {
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return p.runtimeError(err, "OCI runtime restore failed")
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}
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sio := p.stdio
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if sio.Stdin != "" {
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sc, err := fifo.OpenFifo(ctx, sio.Stdin, syscall.O_WRONLY|syscall.O_NONBLOCK, 0)
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if err != nil {
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return errors.Wrapf(err, "failed to open stdin fifo %s", sio.Stdin)
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}
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p.stdin = sc
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p.closers = append(p.closers, sc)
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}
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var copyWaitGroup sync.WaitGroup
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if !sio.IsNull() {
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if err := copyPipes(ctx, p.io, sio.Stdin, sio.Stdout, sio.Stderr, &p.wg, ©WaitGroup); err != nil {
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return errors.Wrap(err, "failed to start io pipe copy")
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}
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}
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copyWaitGroup.Wait()
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pid, err := runc.ReadPidFile(s.opts.PidFile)
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if err != nil {
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return errors.Wrap(err, "failed to retrieve OCI runtime container pid")
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}
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p.pid = pid
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return s.transition("running")
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}
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func (s *createdCheckpointState) Delete(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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if err := s.p.delete(ctx); err != nil {
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return err
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}
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return s.transition("deleted")
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}
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func (s *createdCheckpointState) Kill(ctx context.Context, sig uint32, all bool) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.kill(ctx, sig, all)
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}
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func (s *createdCheckpointState) SetExited(status int) {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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s.p.setExited(status)
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if err := s.transition("stopped"); err != nil {
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panic(err)
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}
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}
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func (s *createdCheckpointState) Exec(ctx context.Context, path string, r *ExecConfig) (Process, error) {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return nil, errors.Errorf("cannot exec in a created state")
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}
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type runningState struct {
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p *Init
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}
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func (s *runningState) transition(name string) error {
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switch name {
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case "stopped":
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s.p.initState = &stoppedState{p: s.p}
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case "paused":
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s.p.initState = &pausedState{p: s.p}
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default:
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return errors.Errorf("invalid state transition %q to %q", stateName(s), name)
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}
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return nil
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}
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func (s *runningState) Pause(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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if err := s.p.pause(ctx); err != nil {
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return err
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}
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return s.transition("paused")
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}
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func (s *runningState) Resume(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot resume a running process")
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}
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func (s *runningState) Update(context context.Context, r *google_protobuf.Any) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.update(context, r)
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}
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func (s *runningState) Checkpoint(ctx context.Context, r *CheckpointConfig) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.checkpoint(ctx, r)
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}
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func (s *runningState) Resize(ws console.WinSize) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.resize(ws)
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}
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func (s *runningState) Start(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot start a running process")
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}
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func (s *runningState) Delete(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot delete a running process")
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}
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func (s *runningState) Kill(ctx context.Context, sig uint32, all bool) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.kill(ctx, sig, all)
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}
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func (s *runningState) SetExited(status int) {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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s.p.setExited(status)
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if err := s.transition("stopped"); err != nil {
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panic(err)
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}
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}
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func (s *runningState) Exec(ctx context.Context, path string, r *ExecConfig) (Process, error) {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.exec(ctx, path, r)
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}
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type pausedState struct {
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p *Init
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}
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func (s *pausedState) transition(name string) error {
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switch name {
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case "running":
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s.p.initState = &runningState{p: s.p}
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case "stopped":
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s.p.initState = &stoppedState{p: s.p}
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default:
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return errors.Errorf("invalid state transition %q to %q", stateName(s), name)
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}
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return nil
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}
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func (s *pausedState) Pause(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot pause a paused container")
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}
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func (s *pausedState) Resume(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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if err := s.p.resume(ctx); err != nil {
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return err
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}
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return s.transition("running")
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}
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func (s *pausedState) Update(context context.Context, r *google_protobuf.Any) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.update(context, r)
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}
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func (s *pausedState) Checkpoint(ctx context.Context, r *CheckpointConfig) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.checkpoint(ctx, r)
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}
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func (s *pausedState) Resize(ws console.WinSize) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.resize(ws)
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}
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func (s *pausedState) Start(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot start a paused process")
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}
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func (s *pausedState) Delete(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot delete a paused process")
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}
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func (s *pausedState) Kill(ctx context.Context, sig uint32, all bool) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.kill(ctx, sig, all)
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}
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func (s *pausedState) SetExited(status int) {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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s.p.setExited(status)
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if err := s.transition("stopped"); err != nil {
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panic(err)
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}
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}
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func (s *pausedState) Exec(ctx context.Context, path string, r *ExecConfig) (Process, error) {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return nil, errors.Errorf("cannot exec in a paused state")
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}
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type stoppedState struct {
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p *Init
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}
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func (s *stoppedState) transition(name string) error {
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switch name {
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case "deleted":
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s.p.initState = &deletedState{}
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default:
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return errors.Errorf("invalid state transition %q to %q", stateName(s), name)
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}
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return nil
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}
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func (s *stoppedState) Pause(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot pause a stopped container")
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}
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func (s *stoppedState) Resume(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot resume a stopped container")
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}
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func (s *stoppedState) Update(context context.Context, r *google_protobuf.Any) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot update a stopped container")
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}
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func (s *stoppedState) Checkpoint(ctx context.Context, r *CheckpointConfig) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot checkpoint a stopped container")
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}
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func (s *stoppedState) Resize(ws console.WinSize) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot resize a stopped container")
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}
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func (s *stoppedState) Start(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot start a stopped process")
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}
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func (s *stoppedState) Delete(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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if err := s.p.delete(ctx); err != nil {
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return err
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}
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return s.transition("deleted")
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}
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func (s *stoppedState) Kill(ctx context.Context, sig uint32, all bool) error {
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return errdefs.ToGRPCf(errdefs.ErrNotFound, "process %s not found", s.p.id)
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}
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func (s *stoppedState) SetExited(status int) {
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// no op
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}
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func (s *stoppedState) Exec(ctx context.Context, path string, r *ExecConfig) (Process, error) {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return nil, errors.Errorf("cannot exec in a stopped state")
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}
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