github.com/endocode/docker@v1.4.2-0.20160113120958-46eb4700391e/integration-cli/docker_cli_attach_test.go (about) 1 package main 2 3 import ( 4 "bufio" 5 "fmt" 6 "io" 7 "os/exec" 8 "strings" 9 "sync" 10 "time" 11 12 "github.com/docker/docker/pkg/integration/checker" 13 "github.com/go-check/check" 14 ) 15 16 const attachWait = 5 * time.Second 17 18 func (s *DockerSuite) TestAttachMultipleAndRestart(c *check.C) { 19 testRequires(c, DaemonIsLinux) 20 21 endGroup := &sync.WaitGroup{} 22 startGroup := &sync.WaitGroup{} 23 endGroup.Add(3) 24 startGroup.Add(3) 25 26 err := waitForContainer("attacher", "-d", "busybox", "/bin/sh", "-c", "while true; do sleep 1; echo hello; done") 27 c.Assert(err, check.IsNil) 28 29 startDone := make(chan struct{}) 30 endDone := make(chan struct{}) 31 32 go func() { 33 endGroup.Wait() 34 close(endDone) 35 }() 36 37 go func() { 38 startGroup.Wait() 39 close(startDone) 40 }() 41 42 for i := 0; i < 3; i++ { 43 go func() { 44 cmd := exec.Command(dockerBinary, "attach", "attacher") 45 46 defer func() { 47 cmd.Wait() 48 endGroup.Done() 49 }() 50 51 out, err := cmd.StdoutPipe() 52 if err != nil { 53 c.Fatal(err) 54 } 55 56 if err := cmd.Start(); err != nil { 57 c.Fatal(err) 58 } 59 60 buf := make([]byte, 1024) 61 62 if _, err := out.Read(buf); err != nil && err != io.EOF { 63 c.Fatal(err) 64 } 65 66 startGroup.Done() 67 68 if !strings.Contains(string(buf), "hello") { 69 c.Fatalf("unexpected output %s expected hello\n", string(buf)) 70 } 71 }() 72 } 73 74 select { 75 case <-startDone: 76 case <-time.After(attachWait): 77 c.Fatalf("Attaches did not initialize properly") 78 } 79 80 dockerCmd(c, "kill", "attacher") 81 82 select { 83 case <-endDone: 84 case <-time.After(attachWait): 85 c.Fatalf("Attaches did not finish properly") 86 } 87 } 88 89 func (s *DockerSuite) TestAttachTtyWithoutStdin(c *check.C) { 90 testRequires(c, DaemonIsLinux) 91 out, _ := dockerCmd(c, "run", "-d", "-ti", "busybox") 92 93 id := strings.TrimSpace(out) 94 c.Assert(waitRun(id), check.IsNil) 95 96 done := make(chan error) 97 go func() { 98 defer close(done) 99 100 cmd := exec.Command(dockerBinary, "attach", id) 101 if _, err := cmd.StdinPipe(); err != nil { 102 done <- err 103 return 104 } 105 106 expected := "cannot enable tty mode" 107 if out, _, err := runCommandWithOutput(cmd); err == nil { 108 done <- fmt.Errorf("attach should have failed") 109 return 110 } else if !strings.Contains(out, expected) { 111 done <- fmt.Errorf("attach failed with error %q: expected %q", out, expected) 112 return 113 } 114 }() 115 116 select { 117 case err := <-done: 118 c.Assert(err, check.IsNil) 119 case <-time.After(attachWait): 120 c.Fatal("attach is running but should have failed") 121 } 122 } 123 124 func (s *DockerSuite) TestAttachDisconnect(c *check.C) { 125 testRequires(c, DaemonIsLinux) 126 out, _ := dockerCmd(c, "run", "-di", "busybox", "/bin/cat") 127 id := strings.TrimSpace(out) 128 129 cmd := exec.Command(dockerBinary, "attach", id) 130 stdin, err := cmd.StdinPipe() 131 if err != nil { 132 c.Fatal(err) 133 } 134 defer stdin.Close() 135 stdout, err := cmd.StdoutPipe() 136 c.Assert(err, check.IsNil) 137 defer stdout.Close() 138 c.Assert(cmd.Start(), check.IsNil) 139 defer cmd.Process.Kill() 140 141 _, err = stdin.Write([]byte("hello\n")) 142 c.Assert(err, check.IsNil) 143 out, err = bufio.NewReader(stdout).ReadString('\n') 144 c.Assert(err, check.IsNil) 145 c.Assert(strings.TrimSpace(out), check.Equals, "hello") 146 147 c.Assert(stdin.Close(), check.IsNil) 148 149 // Expect container to still be running after stdin is closed 150 running, err := inspectField(id, "State.Running") 151 c.Assert(err, check.IsNil) 152 c.Assert(running, check.Equals, "true") 153 } 154 155 func (s *DockerSuite) TestAttachPausedContainer(c *check.C) { 156 testRequires(c, DaemonIsLinux) // Containers cannot be paused on Windows 157 defer unpauseAllContainers() 158 dockerCmd(c, "run", "-d", "--name=test", "busybox", "top") 159 dockerCmd(c, "pause", "test") 160 out, _, err := dockerCmdWithError("attach", "test") 161 c.Assert(err, checker.NotNil, check.Commentf(out)) 162 c.Assert(out, checker.Contains, "You cannot attach to a paused container, unpause it first") 163 }