// save a repo and try to load it using stdout
func (s *DockerSuite) TestSaveAndLoadRepoStdout(c *check.C) {
name := "test-save-and-load-repo-stdout"
dockerCmd(c, "run", "--name", name, "busybox", "true")
repoName := "foobar-save-load-test"
before, _ := dockerCmd(c, "commit", name, repoName)
before = strings.TrimRight(before, "\n")
tmpFile, err := ioutil.TempFile("", "foobar-save-load-test.tar")
c.Assert(err, check.IsNil)
defer os.Remove(tmpFile.Name())
saveCmd := exec.Command(dockerBinary, "save", repoName)
saveCmd.Stdout = tmpFile
_, err = runCommand(saveCmd)
c.Assert(err, check.IsNil)
tmpFile, err = os.Open(tmpFile.Name())
c.Assert(err, check.IsNil)
defer tmpFile.Close()
deleteImages(repoName)
loadCmd := exec.Command(dockerBinary, "load")
loadCmd.Stdin = tmpFile
out, _, err := runCommandWithOutput(loadCmd)
c.Assert(err, check.IsNil, check.Commentf(out))
after := inspectField(c, repoName, "Id")
after = strings.TrimRight(after, "\n")
c.Assert(after, check.Equals, before) //inspect is not the same after a save / load
deleteImages(repoName)
pty, tty, err := pty.Open()
c.Assert(err, check.IsNil)
cmd := exec.Command(dockerBinary, "save", repoName)
cmd.Stdin = tty
cmd.Stdout = tty
cmd.Stderr = tty
c.Assert(cmd.Start(), check.IsNil)
c.Assert(cmd.Wait(), check.NotNil) //did not break writing to a TTY
buf := make([]byte, 1024)
n, err := pty.Read(buf)
c.Assert(err, check.IsNil) //could not read tty output
c.Assert(string(buf[:n]), checker.Contains, "Cowardly refusing", check.Commentf("help output is not being yielded", out))
}
// fail because load didn't receive data from stdin
func (s *DockerSuite) TestLoadNoStdinFail(c *check.C) {
pty, tty, err := pty.Open()
c.Assert(err, check.IsNil)
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
cmd := exec.CommandContext(ctx, dockerBinary, "load")
cmd.Stdin = tty
cmd.Stdout = tty
cmd.Stderr = tty
c.Assert(cmd.Run(), check.NotNil) // docker-load should fail
buf := make([]byte, 1024)
n, err := pty.Read(buf)
c.Assert(err, check.IsNil) //could not read tty output
c.Assert(string(buf[:n]), checker.Contains, "requested load from stdin, but stdin is empty")
}
// save a repo and try to load it using stdout
func (s *DockerSuite) TestSaveAndLoadRepoStdout(c *check.C) {
name := "test-save-and-load-repo-stdout"
runCmd := exec.Command(dockerBinary, "run", "--name", name, "busybox", "true")
out, _, err := runCommandWithOutput(runCmd)
if err != nil {
c.Fatalf("failed to create a container: %s, %v", out, err)
}
repoName := "foobar-save-load-test"
commitCmd := exec.Command(dockerBinary, "commit", name, repoName)
if out, _, err = runCommandWithOutput(commitCmd); err != nil {
c.Fatalf("failed to commit container: %s, %v", out, err)
}
inspectCmd := exec.Command(dockerBinary, "inspect", repoName)
before, _, err := runCommandWithOutput(inspectCmd)
if err != nil {
c.Fatalf("the repo should exist before saving it: %s, %v", before, err)
}
tmpFile, err := ioutil.TempFile("", "foobar-save-load-test.tar")
c.Assert(err, check.IsNil)
defer os.Remove(tmpFile.Name())
saveCmd := exec.Command(dockerBinary, "save", repoName)
saveCmd.Stdout = tmpFile
if _, err = runCommand(saveCmd); err != nil {
c.Fatalf("failed to save repo: %v", err)
}
tmpFile, err = os.Open(tmpFile.Name())
c.Assert(err, check.IsNil)
deleteImages(repoName)
loadCmd := exec.Command(dockerBinary, "load")
loadCmd.Stdin = tmpFile
if out, _, err = runCommandWithOutput(loadCmd); err != nil {
c.Fatalf("failed to load repo: %s, %v", out, err)
}
inspectCmd = exec.Command(dockerBinary, "inspect", repoName)
after, _, err := runCommandWithOutput(inspectCmd)
if err != nil {
c.Fatalf("the repo should exist after loading it: %s %v", after, err)
}
if before != after {
c.Fatalf("inspect is not the same after a save / load")
}
deleteImages(repoName)
pty, tty, err := pty.Open()
if err != nil {
c.Fatalf("Could not open pty: %v", err)
}
cmd := exec.Command(dockerBinary, "save", repoName)
cmd.Stdin = tty
cmd.Stdout = tty
cmd.Stderr = tty
if err := cmd.Start(); err != nil {
c.Fatalf("start err: %v", err)
}
if err := cmd.Wait(); err == nil {
c.Fatal("did not break writing to a TTY")
}
buf := make([]byte, 1024)
n, err := pty.Read(buf)
if err != nil {
c.Fatal("could not read tty output")
}
if !bytes.Contains(buf[:n], []byte("Cowardly refusing")) {
c.Fatal("help output is not being yielded", out)
}
}