Fix a panic in GVRFromType for structured types

pkg/util/utils.go

@@ -21,6 +21,7 @@ import (
 	"runtime"
 	"strings"
 
+	"k8s.io/apimachinery/pkg/api/meta"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/client-go/discovery"
@@ -142,7 +143,14 @@ func GVRFromType(resourceName string, expectedType interface{}) *schema.GroupVer
 		// testUnstructuredMock.Foo is a mock type for testing
 		return nil
 	}
-	apiVersion := expectedType.(*unstructured.Unstructured).Object["apiVersion"].(string)
+	var apiVersion string
+	if u, ok := expectedType.(unstructured.Unstructured); ok {
+		apiVersion = u.GetAPIVersion()
+	} else if t, err := meta.TypeAccessor(expectedType); err == nil {
+		apiVersion = t.GetAPIVersion()
+	} else {
+		panic(err)
+	}
 	g, v, found := strings.Cut(apiVersion, "/")
 	if !found {
 		g = "core"