Remove vestigial kustomize var refs

This patch removes the use of vestigial kustomize
var references. These taught kustomize about sources
of variables used elsewhere and have been made obsolete
by the use of the new replacements directive.

config/certmanager/certificate.yaml

@@ -12,7 +12,7 @@ spec:
 apiVersion: cert-manager.io/v1
 kind: Certificate
 metadata:
-  name: serving-cert  # this name should match the one appeared in kustomizeconfig.yaml
+  name: serving-cert
   namespace: system
 spec:
   # WEBHOOK_SERVICE_NAME_PLACEHOLDER and WEBHOOK_SERVICE_NAMESPACE_PLACEHOLDER will be substituted by kustomize

config/certmanager/kustomization.yaml

@@ -1,5 +1,6 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
+
 resources:
 - certificate.yaml
 

config/certmanager/kustomizeconfig.yaml

@@ -1,19 +1,8 @@
-# This configuration is for teaching kustomize how to update name ref and var substitution 
+# nameReference teaches Kustomize which fields represent a resource name.
 nameReference:
 - kind: Issuer
   group: cert-manager.io
   fieldSpecs:
   - kind: Certificate
     group: cert-manager.io
     path: spec/issuerRef/name
-
-varReference:
-- kind: Certificate
-  group: cert-manager.io
-  path: spec/commonName
-- kind: Certificate
-  group: cert-manager.io
-  path: spec/dnsNames
-- kind: Certificate
-  group: cert-manager.io
-  path: spec/secretName

config/crd/kustomizeconfig.yaml

@@ -1,4 +1,4 @@
-# This file is for teaching kustomize how to substitute name and namespace reference in CRD
+# nameReference teaches Kustomize which fields represent a resource name.
 nameReference:
 - kind: Service
   version: v1
@@ -7,11 +7,9 @@ nameReference:
     group: apiextensions.k8s.io
     path: spec/conversion/webhook/clientConfig/service/name
 
+# namespace teaches Kustomize which fields represent a resource namespace.
 namespace:
 - kind: CustomResourceDefinition
   group: apiextensions.k8s.io
   path: spec/conversion/webhook/clientConfig/service/namespace
   create: false
-
-varReference:
-- path: metadata/annotations

config/default/kustomization.yaml

@@ -1,9 +1,6 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 
-configurations:
-- kustomizeconfig.yaml
-
 resources:
 - ../crd
 - ../manager

config/webhook/kustomizeconfig.yaml

@@ -1,5 +1,4 @@
-# the following config is for teaching kustomize where to look at when substituting vars.
-# It requires kustomize v2.1.0 or newer to work properly.
+# nameReference teaches Kustomize which fields represent a resource name.
 nameReference:
 - kind: Service
   version: v1
@@ -11,6 +10,7 @@ nameReference:
     group: admissionregistration.k8s.io
     path: webhooks/clientConfig/service/name
 
+# namespace teaches Kustomize which fields represent a resource namespace.
 namespace:
 - kind: MutatingWebhookConfiguration
   group: admissionregistration.k8s.io
@@ -20,6 +20,3 @@ namespace:
   group: admissionregistration.k8s.io
   path: webhooks/clientConfig/service/namespace
   create: true
-
-varReference:
-- path: metadata/annotations