2018-12-04 09:55:39 +00:00
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/*
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Copyright The containerd Authors.
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Copyright 2018 Google LLC
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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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https://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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"github.com/containerd/console"
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"github.com/containerd/containerd/errdefs"
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"github.com/containerd/containerd/runtime/proc"
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"github.com/pkg/errors"
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)
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type initState interface {
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2019-01-30 17:50:10 +00:00
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Resize(console.WinSize) error
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Start(context.Context) error
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Delete(context.Context) error
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2018-12-04 09:55:39 +00:00
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Exec(context.Context, string, *ExecConfig) (proc.Process, error)
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2019-01-30 17:50:10 +00:00
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Kill(context.Context, uint32, bool) error
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SetExited(int)
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2018-12-04 09:55:39 +00:00
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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) Resize(ws console.WinSize) error {
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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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if err := s.p.start(ctx); err != nil {
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// Containerd doesn't allow deleting container in created state.
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// However, for gvisor, a non-root container in created state can
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// only go to running state. If the container can't be started,
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// it can only stay in created state, and never be deleted.
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// To work around that, we treat non-root container in start failure
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// state as stopped.
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if !s.p.Sandbox {
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s.p.io.Close()
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s.p.setExited(internalErrorCode)
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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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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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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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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.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) (proc.Process, error) {
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return s.p.exec(ctx, path, r)
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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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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) Resize(ws console.WinSize) error {
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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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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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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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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.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) (proc.Process, error) {
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return s.p.exec(ctx, path, r)
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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) Resize(ws console.WinSize) error {
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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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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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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) (proc.Process, error) {
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return nil, errors.Errorf("cannot exec in a stopped state")
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}
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