NFS-Provisioner: Add support to back NFS with volume claims

This ps adds the ability for the NFS-provisioner to use a volume
claim for providing storage for other services. This provides the
ability to provide read-write-many access backed by a
read-write-once storage class, in situations where such a
requirement exists.

Change-Id: I7dcf79b871fd4fa699ee4e3a50151a654f27761f

nfs-provisioner/templates/deployment.yaml

@@ -73,7 +73,11 @@ spec:
                 fieldRef:
                   fieldPath: metadata.namespace
           args:
+            {{ if empty .Values.storageclass.provisioner -}}
+            - "-provisioner=nfs/{{ .Release.Name }}"
+            {{- else -}}
             - "-provisioner={{ .Values.storageclass.provisioner }}"
+            {{- end }}
             - "-grace-period=10"
           volumeMounts:
             - name: export-volume
@@ -81,6 +85,15 @@ spec:
       volumes:
 {{ tuple . | include "helm-toolkit.snippets.kubernetes_entrypoint_secret_mount" | indent 8 }}
         - name: export-volume
+          {{- if eq .Values.storage.type "persistentVolumeClaim" }}
+          persistentVolumeClaim:
+            {{ if empty .Values.storage.persistentVolumeClaim.name -}}
+            claimName: {{ .Release.Name }}
+            {{- else -}}
+            claimName: {{ .Values.storage.persistentVolumeClaim.name }}
+            {{- end }}
+          {{- else if eq .Values.storage.type "hostPath" }}
           hostPath:
-            path: {{ .Values.storage.host.host_path }}
+            path: {{ .Values.storage.hostPath.path }}
+          {{- end }}
 {{- end }}

nfs-provisioner/templates/storage_class.yaml

@@ -20,8 +20,16 @@ limitations under the License.
 kind: StorageClass
 apiVersion: storage.k8s.io/v1
 metadata:
+  {{ if empty .Values.storageclass.name -}}
+  name: {{ .Release.Name }}
+  {{- else -}}
   name: {{ .Values.storageclass.name }}
+  {{- end }}
+{{ if empty .Values.storageclass.provisioner -}}
+provisioner: nfs/{{ .Release.Name }}
+{{- else -}}
 provisioner: {{ .Values.storageclass.provisioner }}
+{{- end }}
 parameters:
   mountOptions: vers=4.1
 {{- end }}

nfs-provisioner/templates/volume_claim.yaml

@@ -0,0 +1,37 @@
+{{/*
+Copyright 2017 The Openstack-Helm Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/}}
+
+{{- if .Values.manifests.volume_claim }}
+{{- if eq .Values.storage.type "persistentVolumeClaim" }}
+{{- $envAll := . }}
+---
+kind: PersistentVolumeClaim
+apiVersion: v1
+metadata:
+  {{ if empty .Values.storage.persistentVolumeClaim.name -}}
+  name: {{ .Release.Name }}
+  {{- else -}}
+  name: {{ .Values.storage.persistentVolumeClaim.name }}
+  {{- end }}
+spec:
+  accessModes:
+    - {{ .Values.storage.persistentVolumeClaim.access_mode }}
+  resources:
+    requests:
+      storage: {{ .Values.storage.persistentVolumeClaim.size }}
+  storageClassName: {{ .Values.storage.persistentVolumeClaim.class_name }}
+{{- end }}
+{{- end }}

nfs-provisioner/values.yaml

@@ -57,16 +57,28 @@ images:
       - image_repo_sync
 
 storage:
-  host:
-    host_path: /var/lib/openstack-helm/nfs
+  type: hostPath
+  hostPath:
+    path: /var/lib/openstack-helm/nfs
+  persistentVolumeClaim:
+    access_mode: ReadWriteOnce
+    class_name: general
+    #NOTE(portdirect): Unless explicity set the PV name will be populated to
+    # match "{{ .Release.Name }}".
+    name: null
+    size: 10Gi
 
 labels:
   node_selector_key: openstack-control-plane
   node_selector_value: enabled
 
 storageclass:
-  provisioner: example.com/nfs
-  name: general
+  #NOTE(portdirect): Unless explicity set the provisioner name will be generated
+  # with the format "nfs/{{ .Release.Name }}"
+  provisioner: null
+  #NOTE(portdirect): Unless explicity set the PV name will be populated to
+  # match "{{ .Release.Name }}".
+  name: null
 
 dependencies:
   nfs:
@@ -119,3 +131,4 @@ manifests:
   service: true
   serviceaccount: true
   storage_class: true
+  volume_claim: true