github.com/gunjan5/docker@v1.8.2/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/go-check/check"
    13  )
    14  
    15  const attachWait = 5 * time.Second
    16  
    17  func (s *DockerSuite) TestAttachMultipleAndRestart(c *check.C) {
    18  
    19  	endGroup := &sync.WaitGroup{}
    20  	startGroup := &sync.WaitGroup{}
    21  	endGroup.Add(3)
    22  	startGroup.Add(3)
    23  
    24  	if err := waitForContainer("attacher", "-d", "busybox", "/bin/sh", "-c", "while true; do sleep 1; echo hello; done"); err != nil {
    25  		c.Fatal(err)
    26  	}
    27  
    28  	startDone := make(chan struct{})
    29  	endDone := make(chan struct{})
    30  
    31  	go func() {
    32  		endGroup.Wait()
    33  		close(endDone)
    34  	}()
    35  
    36  	go func() {
    37  		startGroup.Wait()
    38  		close(startDone)
    39  	}()
    40  
    41  	for i := 0; i < 3; i++ {
    42  		go func() {
    43  			cmd := exec.Command(dockerBinary, "attach", "attacher")
    44  
    45  			defer func() {
    46  				cmd.Wait()
    47  				endGroup.Done()
    48  			}()
    49  
    50  			out, err := cmd.StdoutPipe()
    51  			if err != nil {
    52  				c.Fatal(err)
    53  			}
    54  
    55  			if err := cmd.Start(); err != nil {
    56  				c.Fatal(err)
    57  			}
    58  
    59  			buf := make([]byte, 1024)
    60  
    61  			if _, err := out.Read(buf); err != nil && err != io.EOF {
    62  				c.Fatal(err)
    63  			}
    64  
    65  			startGroup.Done()
    66  
    67  			if !strings.Contains(string(buf), "hello") {
    68  				c.Fatalf("unexpected output %s expected hello\n", string(buf))
    69  			}
    70  		}()
    71  	}
    72  
    73  	select {
    74  	case <-startDone:
    75  	case <-time.After(attachWait):
    76  		c.Fatalf("Attaches did not initialize properly")
    77  	}
    78  
    79  	dockerCmd(c, "kill", "attacher")
    80  
    81  	select {
    82  	case <-endDone:
    83  	case <-time.After(attachWait):
    84  		c.Fatalf("Attaches did not finish properly")
    85  	}
    86  
    87  }
    88  
    89  func (s *DockerSuite) TestAttachTtyWithoutStdin(c *check.C) {
    90  	out, _ := dockerCmd(c, "run", "-d", "-ti", "busybox")
    91  
    92  	id := strings.TrimSpace(out)
    93  	if err := waitRun(id); err != nil {
    94  		c.Fatal(err)
    95  	}
    96  
    97  	defer func() {
    98  		cmd := exec.Command(dockerBinary, "kill", id)
    99  		if out, _, err := runCommandWithOutput(cmd); err != nil {
   100  			c.Fatalf("failed to kill container: %v (%v)", out, err)
   101  		}
   102  	}()
   103  
   104  	done := make(chan error)
   105  	go func() {
   106  		defer close(done)
   107  
   108  		cmd := exec.Command(dockerBinary, "attach", id)
   109  		if _, err := cmd.StdinPipe(); err != nil {
   110  			done <- err
   111  			return
   112  		}
   113  
   114  		expected := "cannot enable tty mode"
   115  		if out, _, err := runCommandWithOutput(cmd); err == nil {
   116  			done <- fmt.Errorf("attach should have failed")
   117  			return
   118  		} else if !strings.Contains(out, expected) {
   119  			done <- fmt.Errorf("attach failed with error %q: expected %q", out, expected)
   120  			return
   121  		}
   122  	}()
   123  
   124  	select {
   125  	case err := <-done:
   126  		c.Assert(err, check.IsNil)
   127  	case <-time.After(attachWait):
   128  		c.Fatal("attach is running but should have failed")
   129  	}
   130  }
   131  
   132  func (s *DockerSuite) TestAttachDisconnect(c *check.C) {
   133  	out, _ := dockerCmd(c, "run", "-di", "busybox", "/bin/cat")
   134  	id := strings.TrimSpace(out)
   135  
   136  	cmd := exec.Command(dockerBinary, "attach", id)
   137  	stdin, err := cmd.StdinPipe()
   138  	if err != nil {
   139  		c.Fatal(err)
   140  	}
   141  	defer stdin.Close()
   142  	stdout, err := cmd.StdoutPipe()
   143  	if err != nil {
   144  		c.Fatal(err)
   145  	}
   146  	defer stdout.Close()
   147  	if err := cmd.Start(); err != nil {
   148  		c.Fatal(err)
   149  	}
   150  	defer cmd.Process.Kill()
   151  
   152  	if _, err := stdin.Write([]byte("hello\n")); err != nil {
   153  		c.Fatal(err)
   154  	}
   155  	out, err = bufio.NewReader(stdout).ReadString('\n')
   156  	if err != nil {
   157  		c.Fatal(err)
   158  	}
   159  	if strings.TrimSpace(out) != "hello" {
   160  		c.Fatalf("expected 'hello', got %q", out)
   161  	}
   162  
   163  	if err := stdin.Close(); err != nil {
   164  		c.Fatal(err)
   165  	}
   166  
   167  	// Expect container to still be running after stdin is closed
   168  	running, err := inspectField(id, "State.Running")
   169  	if err != nil {
   170  		c.Fatal(err)
   171  	}
   172  	if running != "true" {
   173  		c.Fatal("expected container to still be running")
   174  	}
   175  
   176  }