provide existing configmap Andrea Pulvirenti <an.pulvy@gmail.com>

charts/nfs-subdir-external-provisioner/templates/_helpers.tpl

@@ -1,3 +1,11 @@
+
+{{/* 
+   Allow namespace to be overriden
+*/}}
+{{- define "common.names.namespace" -}}
+{{- default .Release.Namespace .Values.namespaceOverride | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+
 {{/* vim: set filetype=mustache: */}}
 {{/*
 Expand the name of the chart.
@@ -101,3 +109,50 @@ Selector labels
 app: {{ template "nfs-subdir-external-provisioner.name" . }}
 release: {{ .Release.Name }}
 {{- end }}
+
+{{/*
+Return true if an existing configmap name has been provided 
+*/}}
+{{- define "nfs.existing-configmap-provided" -}}
+{{- if  .Values.nfs.existingConfigMap.name -}}
+    {{- true -}}
+{{- end -}}
+{{- end -}}
+
+{{/*
+Return the existing NFS Configmap Name
+*/}}
+{{- define "nfs.existing-configmap" -}}
+     {{- if .Values.nfs.existingConfigMap.name -}}
+         {{- printf "%s" (tpl .Values.nfs.existingConfigMap.name $) -}}
+     {{- else -}}
+         {{- printf "\n%s CONFIGMAP ERROR: no existing configmap has been provided" }}
+     {{- end -}}
+{{- end }}
+
+
+{{/*
+Reuses the value from an existing configmap, otherwise sets its value to a default value.
+
+Usage:
+{{ include "common.configmap.lookup" (dict "secret" "configmap-name" "key" "keyName" "defaultValue" .Values.myValue "context" $) }}
+
+Params:
+  - config - String - Required - Name of the 'Secret' resource where the password is stored.
+  - key - String - Required - Name of the key in the secret.
+  - defaultValue - String - Required - The path to the validating value in the values.yaml, e.g: "mysql.password". Will pick first parameter with a defined value.
+  - context - Context - Required - Parent context.
+
+*/}}
+{{- define "common.configmap.lookup" -}}
+{{- $value := "" -}}
+{{- $configmapData := (lookup "v1" "ConfigMap" .context.Values.nfs.existingConfigMap.namespace .config).data -}}
+{{- if and $configmapData (hasKey $configmapData .key) -}}
+  {{- $value = index $configmapData .key -}}
+{{- else if .defaultValue -}}
+  {{- $value = .defaultValue | toString  -}}
+{{- end -}}
+{{- if $value -}}
+{{- printf "%s" $value -}}
+{{- end -}}
+{{- end -}}

charts/nfs-subdir-external-provisioner/templates/configmap.yaml

@@ -0,0 +1,16 @@
+{{- $server := .Values.nfs.server  | default "127.0.0.1" -}}
+{{ if (include "nfs.existing-configmap-provided" .) }}
+{{- $existingConfigMap := (lookup "v1" "ConfigMap" .Values.nfs.existingConfigMap.namespace .Values.nfs.existingConfigMap.name).data }}
+{{- if (not $existingConfigMap)  }}
+apiVersion: v1
+data:
+  path: {{ .Values.nfs.path }}
+  server: {{ $server }}
+immutable: false
+kind: ConfigMap
+metadata:
+  name: {{ template "nfs.existing-configmap" . }}
+  annotation: 
+    helm.sh/hook: pre-install, pre-upgrade
+{{- end }}
+{{- end }}

charts/nfs-subdir-external-provisioner/templates/deployment.yaml

@@ -1,3 +1,9 @@
+{{- $server := .Values.nfs.server | default "127.0.0.1" -}}
+{{- $path := .Values.nfs.path -}}
+{{- if (include "nfs.existing-configmap-provided" .) -}}
+{{- $server = (include "common.configmap.lookup" (dict "config" .Values.nfs.existingConfigMap.name "key" "server" "defaultValue" "127.0.0.1" "context" $)) -}}
+{{- $path = (include "common.configmap.lookup" (dict "config" .Values.nfs.existingConfigMap.name "key" "path" "defaultValue" .Values.nfs.path "context" $)) -}}
+{{- end -}}
 apiVersion: apps/v1
 kind: Deployment
 metadata:
@@ -54,9 +60,9 @@ spec:
             - name: PROVISIONER_NAME
               value: {{ template "nfs-subdir-external-provisioner.provisionerName" . }}
             - name: NFS_SERVER
-              value: {{ .Values.nfs.server }}
+              value: {{ $server }}
             - name: NFS_PATH
-              value: {{ .Values.nfs.path }}
+              value: {{ $path }}
             {{- if eq .Values.leaderElection.enabled false }}
             - name: ENABLE_LEADER_ELECTION
               value: "false"
@@ -74,8 +80,8 @@ spec:
             claimName: pvc-{{ template "nfs-subdir-external-provisioner.fullname" . }}
 {{- else }}
           nfs:
-            server: {{ .Values.nfs.server }}
+            server: {{ $server}}
-            path: {{ .Values.nfs.path }}
+            path: {{ $path }}
 {{- end }}
       {{- if and (.Values.tolerations) (semverCompare "^1.6-0" .Capabilities.KubeVersion.GitVersion) }}
       tolerations:

charts/nfs-subdir-external-provisioner/templates/persistentvolume.yaml

@@ -1,4 +1,10 @@
 {{ if .Values.nfs.mountOptions -}}
+{{- $server := .Values.nfs.server -}}
+{{- $path := .Values.nfs.path -}}
+{{- if (include "nfs.existing-configmap-provided" .) -}}
+{{- $server := (include "common.configmap.lookup" (dict "config" .Values.nfs.existingConfigMap.name "key" "server" "defaultValue" .Values.nfs.server "context" $)) -}}
+{{- $path := (include "common.configmap.lookup" (dict "config" .Values.nfs.existingConfigMap.name "key" "path" "defaultValue" .Values.nfs.path "context" $)) -}}
+{{- end -}}
 apiVersion: v1
 kind: PersistentVolume
 metadata:
@@ -21,6 +27,6 @@ spec:
     {{- end }}
   {{- end }}
   nfs:
-    server: {{ .Values.nfs.server }}
+    server: {{ $server }}
-    path: {{ .Values.nfs.path }}
+    path: {{ $path }}
 {{ end -}}

charts/nfs-subdir-external-provisioner/values.yaml

@@ -14,6 +14,10 @@ nfs:
   volumeName: nfs-subdir-external-provisioner-root
   # Reclaim policy for the main nfs volume
   reclaimPolicy: Retain
+  # existing configmap in order to get server and path
+  existingConfigMap:
+    name: oiadp-nfs-config
+    namespace: default
 
 # For creating the StorageClass automatically:
 storageClass: