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moby--moby/integration-cli/docker_cli_save_load_unix_test.go

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// +build !windows
package main
import (
"io/ioutil"
"os"
"os/exec"
"github.com/docker/docker/pkg/integration/checker"
"github.com/go-check/check"
"github.com/kr/pty"
)
// 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)
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)
deleteImages(repoName)
loadCmd := exec.Command(dockerBinary, "load")
loadCmd.Stdin = tmpFile
out, _, err := runCommandWithOutput(loadCmd)
c.Assert(err, check.IsNil, check.Commentf(out))
after, _ := dockerCmd(c, "inspect", "-f", "{{.Id}}", repoName)
c.Assert(before, check.Equals, after) //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))
}