Implement ReplicaSet registry.

pkg/api/unversioned/helpers.go

@@ -62,3 +62,19 @@ func LabelSelectorAsSelector(ps *LabelSelector) (labels.Selector, error) {
 	}
 	return selector, nil
 }
+
+// SetAsLabelSelector converts the labels.Set object into a LabelSelector api object.
+func SetAsLabelSelector(ls labels.Set) *LabelSelector {
+	if ls == nil {
+		return nil
+	}
+
+	selector := &LabelSelector{
+		MatchLabels: make(map[string]string),
+	}
+	for label, value := range ls {
+		selector.MatchLabels[label] = value
+	}
+
+	return selector
+}