1// +build !windows 2 3/* 4 Copyright The containerd Authors. 5 6 Licensed under the Apache License, Version 2.0 (the "License"); 7 you may not use this file except in compliance with the License. 8 You may obtain a copy of the License at 9 10 http://www.apache.org/licenses/LICENSE-2.0 11 12 Unless required by applicable law or agreed to in writing, software 13 distributed under the License is distributed on an "AS IS" BASIS, 14 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 See the License for the specific language governing permissions and 16 limitations under the License. 17*/ 18 19package process 20 21import ( 22 "context" 23 24 "github.com/containerd/console" 25 "github.com/pkg/errors" 26) 27 28type execState interface { 29 Resize(console.WinSize) error 30 Start(context.Context) error 31 Delete(context.Context) error 32 Kill(context.Context, uint32, bool) error 33 SetExited(int) 34 Status(context.Context) (string, error) 35} 36 37type execCreatedState struct { 38 p *execProcess 39} 40 41func (s *execCreatedState) transition(name string) error { 42 switch name { 43 case "running": 44 s.p.execState = &execRunningState{p: s.p} 45 case "stopped": 46 s.p.execState = &execStoppedState{p: s.p} 47 case "deleted": 48 s.p.execState = &deletedState{} 49 default: 50 return errors.Errorf("invalid state transition %q to %q", stateName(s), name) 51 } 52 return nil 53} 54 55func (s *execCreatedState) Resize(ws console.WinSize) error { 56 return s.p.resize(ws) 57} 58 59func (s *execCreatedState) Start(ctx context.Context) error { 60 if err := s.p.start(ctx); err != nil { 61 return err 62 } 63 return s.transition("running") 64} 65 66func (s *execCreatedState) Delete(ctx context.Context) error { 67 if err := s.p.delete(ctx); err != nil { 68 return err 69 } 70 71 return s.transition("deleted") 72} 73 74func (s *execCreatedState) Kill(ctx context.Context, sig uint32, all bool) error { 75 return s.p.kill(ctx, sig, all) 76} 77 78func (s *execCreatedState) SetExited(status int) { 79 s.p.setExited(status) 80 81 if err := s.transition("stopped"); err != nil { 82 panic(err) 83 } 84} 85 86func (s *execCreatedState) Status(ctx context.Context) (string, error) { 87 return "created", nil 88} 89 90type execRunningState struct { 91 p *execProcess 92} 93 94func (s *execRunningState) transition(name string) error { 95 switch name { 96 case "stopped": 97 s.p.execState = &execStoppedState{p: s.p} 98 default: 99 return errors.Errorf("invalid state transition %q to %q", stateName(s), name) 100 } 101 return nil 102} 103 104func (s *execRunningState) Resize(ws console.WinSize) error { 105 return s.p.resize(ws) 106} 107 108func (s *execRunningState) Start(ctx context.Context) error { 109 return errors.Errorf("cannot start a running process") 110} 111 112func (s *execRunningState) Delete(ctx context.Context) error { 113 return errors.Errorf("cannot delete a running process") 114} 115 116func (s *execRunningState) Kill(ctx context.Context, sig uint32, all bool) error { 117 return s.p.kill(ctx, sig, all) 118} 119 120func (s *execRunningState) SetExited(status int) { 121 s.p.setExited(status) 122 123 if err := s.transition("stopped"); err != nil { 124 panic(err) 125 } 126} 127 128func (s *execRunningState) Status(ctx context.Context) (string, error) { 129 return "running", nil 130} 131 132type execStoppedState struct { 133 p *execProcess 134} 135 136func (s *execStoppedState) transition(name string) error { 137 switch name { 138 case "deleted": 139 s.p.execState = &deletedState{} 140 default: 141 return errors.Errorf("invalid state transition %q to %q", stateName(s), name) 142 } 143 return nil 144} 145 146func (s *execStoppedState) Resize(ws console.WinSize) error { 147 return errors.Errorf("cannot resize a stopped container") 148} 149 150func (s *execStoppedState) Start(ctx context.Context) error { 151 return errors.Errorf("cannot start a stopped process") 152} 153 154func (s *execStoppedState) Delete(ctx context.Context) error { 155 if err := s.p.delete(ctx); err != nil { 156 return err 157 } 158 159 return s.transition("deleted") 160} 161 162func (s *execStoppedState) Kill(ctx context.Context, sig uint32, all bool) error { 163 return s.p.kill(ctx, sig, all) 164} 165 166func (s *execStoppedState) SetExited(status int) { 167 // no op 168} 169 170func (s *execStoppedState) Status(ctx context.Context) (string, error) { 171 return "stopped", nil 172} 173