diff --git a/components/engine/integration-cli/docker_cli_diff_test.go b/components/engine/integration-cli/docker_cli_diff_test.go index 5f8ba74161..0ae9cca38d 100644 --- a/components/engine/integration-cli/docker_cli_diff_test.go +++ b/components/engine/integration-cli/docker_cli_diff_test.go @@ -64,3 +64,28 @@ func TestDiffEnsureDockerinitFilesAreIgnored(t *testing.T) { logDone("diff - check if ignored files show up in diff") } + +func TestDiffEnsureOnlyKmsgAndPtmx(t *testing.T) { + runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "sleep 0") + cid, _, err := runCommandWithOutput(runCmd) + errorOut(err, t, fmt.Sprintf("%s", err)) + cleanCID := stripTrailingCharacters(cid) + + diffCmd := exec.Command(dockerBinary, "diff", cleanCID) + out, _, err := runCommandWithOutput(diffCmd) + errorOut(err, t, fmt.Sprintf("failed to run diff: %v %v", out, err)) + go deleteContainer(cleanCID) + + expected := map[string]bool{ + "C /dev": true, + "A /dev/full": true, // busybox + "C /dev/ptmx": true, // libcontainer + "A /dev/kmsg": true, // lxc + } + + for _, line := range strings.Split(out, "\n") { + if line != "" && !expected[line] { + t.Errorf("'%s' is shown in the diff but shouldn't", line) + } + } +}