pkg/kubelet/rkt: adapt to new appc/spec

pkg/kubelet/rkt/rkt.go

@@ -357,14 +357,22 @@ func setIsolators(app *appctypes.App, c *v1.Container, ctx *v1.SecurityContext)
 			if err != nil {
 				return err
 			}
-			isolators = append(isolators, set.AsIsolator())
+			isolator, err := set.AsIsolator()
+			if err != nil {
+				return err
+			}
+			isolators = append(isolators, *isolator)
 		}
 		if len(dropCaps) > 0 {
 			set, err := appctypes.NewLinuxCapabilitiesRevokeSet(dropCaps...)
 			if err != nil {
 				return err
 			}
-			isolators = append(isolators, set.AsIsolator())
+			isolator, err := set.AsIsolator()
+			if err != nil {
+				return err
+			}
+			isolators = append(isolators, *isolator)
 		}
 	}
 

pkg/kubelet/rkt/rkt_test.go

@@ -845,7 +845,11 @@ func generateCapRetainIsolator(t *testing.T, caps ...string) appctypes.Isolator
 	if err != nil {
 		t.Fatalf("Error generating cap retain isolator: %v", err)
 	}
-	return retain.AsIsolator()
+	isolator, err := retain.AsIsolator()
+	if err != nil {
+		t.Fatalf("Error generating cap retain isolator: %v", err)
+	}
+	return *isolator
 }
 
 func generateCapRevokeIsolator(t *testing.T, caps ...string) appctypes.Isolator {
@@ -853,7 +857,11 @@ func generateCapRevokeIsolator(t *testing.T, caps ...string) appctypes.Isolator
 	if err != nil {
 		t.Fatalf("Error generating cap revoke isolator: %v", err)
 	}
-	return revoke.AsIsolator()
+	isolator, err := revoke.AsIsolator()
+	if err != nil {
+		t.Fatalf("Error generating cap revoke isolator: %v", err)
+	}
+	return *isolator
 }
 
 func generateCPUIsolator(t *testing.T, request, limit string) appctypes.Isolator {