Function checkLoopbackResult

integration/issue10244_loopback_linux_test.go:50–102

checkLoopbackResult validates whether the loopback interface status within a container is UP

(t *testing.T, useInternalLoopback bool)

// checkLoopbackResult validates whether the loopback interface status within a container is UP
func checkLoopbackResult(t *testing.T, useInternalLoopback bool) bool {
	t.Logf("Create containerd config with 'use_internal_loopback' set to '%t'", useInternalLoopback)
	workDir := t.TempDir()
	configPath := filepath.Join(workDir, "config.toml")
	ctrdConfig := fmt.Sprintf(`
	version = 3

	[plugins]
	[plugins.'io.containerd.cri.v1.runtime']
	  [plugins.'io.containerd.cri.v1.runtime'.cni]
		use_internal_loopback = %t`,
		useInternalLoopback)

	err := os.WriteFile(configPath, []byte(ctrdConfig), 0600)
	require.NoError(t, err)

	t.Logf("Start containerd")
	currentProc := newCtrdProc(t, "containerd", workDir, nil)
	require.NoError(t, currentProc.isReady())

	t.Cleanup(func() {
		t.Log("Cleanup all the pods")
		cleanupPods(t, currentProc.criRuntimeService(t))

		t.Log("Stop containerd process")
		require.NoError(t, currentProc.kill(syscall.SIGTERM))
		require.NoError(t, currentProc.wait(5*time.Minute))
	})

	var (
		testImage     = images.Get(images.BusyBox)
		containerName = "test-container-loopback-v2"
	)

	pullImagesByCRI(t, currentProc.criImageService(t), testImage)

	t.Log("Create a pod with a container that checks the loopback status")
	podCtx := newPodTCtx(t, currentProc.criRuntimeService(t), "container-exec-lo-test", "sandbox")
	cnID := podCtx.createContainer(
		containerName,
		testImage,
		runtime.ContainerState_CONTAINER_RUNNING,
		WithCommand("sleep", "1d"),
		WithVolumeMount("/usr/local/bin/loopback-v2", "/loopback-v2"),
	)

	t.Logf("Check loopback status - should be UP (not DOWN) when 'use_internal_loopback' is '%t'", useInternalLoopback)
	stdout, _, err := podCtx.rSvc.ExecSync(cnID, []string{"/loopback-v2"}, 5*time.Second)
	require.NoError(t, err, "")
	t.Logf("%s", stdout)

	return assert.Contains(t, string(stdout), "UP")
}