make gsk release validation for gs tf provider v2 clearer (#408)

gridscale/resource_gridscale_k8s.go

@@ -71,22 +71,10 @@ func (rgk8sv *ResourceGridscaleK8sValidator) checkIfTemplateSupportsMultiNodePoo
 		k8sMultiNodePoolSupportRelease,
 	)
 	templateRelease, err := NewRelease(template.Properties.Release)
-
 	if err != nil {
 		return fmt.Errorf("%s error: %v", errorPrefix, err)
 	}
-	multiNodePoolSupportRelease, err := NewRelease(k8sMultiNodePoolSupportRelease)
-
-	if err != nil {
-		return fmt.Errorf("%s error: %v", errorPrefix, err)
-	}
-	err = templateRelease.CheckIfFeatureIsKnown(
-		&Feature{
-			Description: "multi node pool support",
-			Release:     *multiNodePoolSupportRelease,
-		},
-	)
-	return err
+	return templateRelease.CheckIfK8SReleaseIsSupported()
 }
 
 // buildInputSchema models the k8s resource's input schema by ResourceGridscaleK8sModeler receiver.

gridscale/resource_gridscale_release.go

@@ -17,6 +17,8 @@ type Feature struct {
 	Release
 }
 
+const supportedK8SRelease = "1.30"
+
 // NewRelease creates a new Release instance.
 func NewRelease(representation string) (*Release, error) {
 	version, err := goVersion.NewVersion(representation)
@@ -36,3 +38,13 @@ func (r *Release) CheckIfFeatureIsKnown(f *Feature) error {
 	}
 	return nil
 }
+
+// CheckIfK8SReleaseIsSupported checks if the Kubernetes release is supported by this gridscale terraform provider.
+func (r *Release) CheckIfK8SReleaseIsSupported() error {
+	if r.LessThan(goVersion.Must(goVersion.NewVersion(supportedK8SRelease))) {
+		return &ReleaseFeatureIncompatibilityError{
+			Detail: fmt.Sprintf("this gridscale terraform provider version v2 supports only Kubernetes release >= %s, for Kubernetes release %s please use gridscale terraform provider version v1", supportedK8SRelease, r.String()),
+		}
+	}
+	return nil
+}