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moby--moby/integration-cli/docker_cli_attach_test.go

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package main
import (
"bufio"
"fmt"
"io"
"os/exec"
"strings"
"sync"
"time"
"github.com/go-check/check"
)
const attachWait = 5 * time.Second
func (s *DockerSuite) TestAttachMultipleAndRestart(c *check.C) {
endGroup := &sync.WaitGroup{}
startGroup := &sync.WaitGroup{}
endGroup.Add(3)
startGroup.Add(3)
if err := waitForContainer("attacher", "-d", "busybox", "/bin/sh", "-c", "while true; do sleep 1; echo hello; done"); err != nil {
c.Fatal(err)
}
startDone := make(chan struct{})
endDone := make(chan struct{})
go func() {
endGroup.Wait()
close(endDone)
}()
go func() {
startGroup.Wait()
close(startDone)
}()
for i := 0; i < 3; i++ {
go func() {
cmd := exec.Command(dockerBinary, "attach", "attacher")
defer func() {
cmd.Wait()
endGroup.Done()
}()
out, err := cmd.StdoutPipe()
if err != nil {
c.Fatal(err)
}
if err := cmd.Start(); err != nil {
c.Fatal(err)
}
buf := make([]byte, 1024)
if _, err := out.Read(buf); err != nil && err != io.EOF {
c.Fatal(err)
}
startGroup.Done()
if !strings.Contains(string(buf), "hello") {
c.Fatalf("unexpected output %s expected hello\n", string(buf))
}
}()
}
select {
case <-startDone:
case <-time.After(attachWait):
c.Fatalf("Attaches did not initialize properly")
}
cmd := exec.Command(dockerBinary, "kill", "attacher")
if _, err := runCommand(cmd); err != nil {
c.Fatal(err)
}
select {
case <-endDone:
case <-time.After(attachWait):
c.Fatalf("Attaches did not finish properly")
}
}
func (s *DockerSuite) TestAttachTtyWithoutStdin(c *check.C) {
cmd := exec.Command(dockerBinary, "run", "-d", "-ti", "busybox")
out, _, err := runCommandWithOutput(cmd)
if err != nil {
c.Fatalf("failed to start container: %v (%v)", out, err)
}
id := strings.TrimSpace(out)
if err := waitRun(id); err != nil {
c.Fatal(err)
}
defer func() {
cmd := exec.Command(dockerBinary, "kill", id)
if out, _, err := runCommandWithOutput(cmd); err != nil {
c.Fatalf("failed to kill container: %v (%v)", out, err)
}
}()
done := make(chan error)
go func() {
defer close(done)
cmd := exec.Command(dockerBinary, "attach", id)
if _, err := cmd.StdinPipe(); err != nil {
done <- err
return
}
expected := "cannot enable tty mode"
if out, _, err := runCommandWithOutput(cmd); err == nil {
done <- fmt.Errorf("attach should have failed")
return
} else if !strings.Contains(out, expected) {
done <- fmt.Errorf("attach failed with error %q: expected %q", out, expected)
return
}
}()
select {
case err := <-done:
c.Assert(err, check.IsNil)
case <-time.After(attachWait):
c.Fatal("attach is running but should have failed")
}
}
func (s *DockerSuite) TestAttachDisconnect(c *check.C) {
out, _ := dockerCmd(c, "run", "-di", "busybox", "/bin/cat")
id := strings.TrimSpace(out)
cmd := exec.Command(dockerBinary, "attach", id)
stdin, err := cmd.StdinPipe()
if err != nil {
c.Fatal(err)
}
defer stdin.Close()
stdout, err := cmd.StdoutPipe()
if err != nil {
c.Fatal(err)
}
defer stdout.Close()
if err := cmd.Start(); err != nil {
c.Fatal(err)
}
defer cmd.Process.Kill()
if _, err := stdin.Write([]byte("hello\n")); err != nil {
c.Fatal(err)
}
out, err = bufio.NewReader(stdout).ReadString('\n')
if err != nil {
c.Fatal(err)
}
if strings.TrimSpace(out) != "hello" {
c.Fatalf("expected 'hello', got %q", out)
}
if err := stdin.Close(); err != nil {
c.Fatal(err)
}
// Expect container to still be running after stdin is closed
running, err := inspectField(id, "State.Running")
if err != nil {
c.Fatal(err)
}
if running != "true" {
c.Fatal("expected container to still be running")
}
}