Overlays can be based on overlays

solves the duplication pointed out in #266 870435a

variants/scale-1-ephemeral/kafka.yaml

@@ -4,7 +4,6 @@ metadata:
   name: kafka
   namespace: kafka
 spec:
-  replicas: 1
   template:
     spec:
       volumes:

variants/scale-1-ephemeral/kustomization.yaml

@@ -1,13 +1,5 @@
 bases:
-- ../../kafka
-- ../../zookeeper
+- ../scale-1
 patchesStrategicMerge:
 - kafka.yaml
 - zookeeper.yaml
-patchesJson6902:
-- target:
-    group: apps
-    version: v1
-    kind: StatefulSet
-    name: kafka
-  path: kafka-scale1-overrides.json

variants/scale-1-ephemeral/zookeeper.yaml

@@ -11,16 +11,8 @@ metadata:
   name: pzoo
   namespace: kafka
 spec:
-  replicas: 1
   template:
     spec:
-      initContainers:
-      - name: init-config
-        env:
-        - name: PZOO_REPLICAS
-          value: '1'
-        - name: ZOO_REPLICAS
-          value: '0'
       volumes:
       - name: data
         emptyDir: {}
@@ -32,16 +24,9 @@ metadata:
   name: zoo
   namespace: kafka
 spec:
-  replicas: 0
   template:
     spec:
-      initContainers:
-      - name: init-config
-        env:
-        # There's no validation on these numbers adding up to a coherent zk config, so watch out
-        - name: PZOO_REPLICAS
-          value: '1'
-        - name: ZOO_REPLICAS
-          value: '0'
-        - name: ID_OFFSET
-          value: '2'
+      volumes:
+      - name: data
+        emptyDir: {}
+  volumeClaimTemplates: []