criu check --feature userns

Signed-off-by: Andrei Vagin <[email protected]>

Author: avagin

libcontainer/integration/checkpoint_test.go

@@ -5,6 +5,7 @@ import (
 	"bytes"
 	"io/ioutil"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"strings"
 	"syscall"
@@ -42,6 +43,10 @@ func TestUsernsCheckpoint(t *testing.T) {
 	if _, err := os.Stat("/proc/self/ns/user"); os.IsNotExist(err) {
 		t.Skip("userns is unsupported")
 	}
+	cmd := exec.Command("criu", "check", "--feature", "userns")
+	if err := cmd.Run(); err != nil {
+		t.Skip("Unable to c/r a container with userns")
+	}
 	testCheckpoint(t, true)
 }