Provide config secret and use tpl function for providers and extraArgs

Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>

charts/external-dns/README.md

@@ -70,3 +70,6 @@ The following table lists the configurable parameters of the _ExternalDNS_ chart
 | `provider`                        | DNS provider where the DNS records will be created, for the available providers and how to configure them see the [README](https://github.com/kubernetes-sigs/external-dns#deploying-to-a-cluster).                                                                                                                   | `aws`                                  |
 | `extraArgs`                       | Extra arguments to pass to the _external-dns_ container, these are needed for provider specific arguments.                                                                                                                                                                                                            | `[]`                                   |
 | `deploymentStrategy`              | .spec.strategy of the external-dns Deployment. Defaults to 'Recreate' since multiple external-dns pods may conflict with each other.                                                                                                                                                                                  | `{type: Recreate}`                     |
+| `secretConfiguration.enabled`     | Enable additional secret configuration                                                                                                                                                                                                                                                                                | `{type: Recreate}`                     |
+| `secretConfiguration.mountPath`   | Mount path of secret configuration                                                                                                                                                                                                                                                                                    | `{type: Recreate}`                     |
+| `secretConfiguration.data`        | Additional secret configuration. Can be used to store dns provider credentials                                                                                                                                                                                                                                        | `{type: Recreate}`                     |

charts/external-dns/templates/deployment.yaml

@@ -23,10 +23,15 @@ spec:
       {{- with .Values.podLabels }}
         {{- toYaml . | nindent 8 }}
       {{- end }}
-      {{- with .Values.podAnnotations }}
+      {{- if or .Values.secretConfiguration.enabled .Values.podAnnotations }}
       annotations:
+        {{- if .Values.secretConfiguration.enabled }}
+        checksum/secret: {{ include (print $.Template.BasePath "/secret.yaml") . | sha256sum }}
+        {{- end }}
+        {{- with .Values.podAnnotations }}
         {{- toYaml . | nindent 8 }}
         {{- end }}
+      {{- end }}
     spec:
       {{- with .Values.imagePullSecrets }}
       imagePullSecrets:
@@ -87,9 +92,9 @@ spec:
             {{- range .Values.domainFilters }}
             - --domain-filter={{ . }}
             {{- end }}
-            - --provider={{ .Values.provider }}
+            - --provider={{ tpl .Values.provider $ }}
           {{- range .Values.extraArgs }}
-            - {{ . }}
+            - {{ tpl . $ }}
           {{- end }}
           ports:
             - name: http
@@ -99,18 +104,31 @@ spec:
             {{- toYaml .Values.livenessProbe | nindent 12 }}
           readinessProbe:
             {{- toYaml .Values.readinessProbe | nindent 12 }}
-          {{- with .Values.extraVolumeMounts }}
+          {{- if or .Values.secretConfiguration.enabled .Values.extraVolumeMounts }}
           volumeMounts:
+            {{- if .Values.secretConfiguration.enabled }}
+            - name: secrets
+              mountPath: {{ tpl .Values.secretConfiguration.mountPath $ }}
+            {{- end }}
+            {{- with .Values.extraVolumeMounts }}
             {{- toYaml . | nindent 12 }}
             {{- end }}
+          {{- end }}
           {{- with .Values.resources }}
           resources:
             {{- toYaml . | nindent 12 }}
           {{- end }}
-      {{- with .Values.extraVolumes }}
+      {{- if or .Values.secretConfiguration.enabled .Values.extraVolumes }}
       volumes:
+        {{- if .Values.secretConfiguration.enabled }}
+        - name: secrets
+          secret:
+            secretName: {{ include "external-dns.fullname" . }}
+        {{- end }}
+        {{- with .Values.extraVolumes }}
         {{- toYaml . | nindent 8 }}
         {{- end }}
+      {{- end }}
       {{- with .Values.nodeSelector }}
       nodeSelector:
         {{- toYaml . | nindent 8 }}

charts/external-dns/templates/secret.yaml

@@ -0,0 +1,13 @@
+{{- if .Values.secretConfiguration.enabled }}
+apiVersion: v1
+kind: Secret
+metadata:
+  name: {{ include "external-dns.fullname" . }}
+  namespace: {{ .Release.Namespace }}
+  labels:
+    {{- include "external-dns.labels" . | nindent 4 }}
+data:
+{{- range $key, $value := .Values.secretConfiguration.data }}
+  {{ $key }}: {{ tpl $value $ | b64enc | quote }}
+{{- end }}
+{{- end }}

charts/external-dns/values.schema.json

@@ -0,0 +1,31 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "type": "object",
+  "properties": {
+    "provider": {
+      "type": "string"
+    },
+    "extraArgs": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      }
+    },
+    "secretConfiguration": {
+      "type": "object",
+      "properties": {
+        "mountPath": {
+          "type": "string"
+        },
+        "data": {
+          "type": "object",
+          "patternProperties": {
+            ".+": {
+              "type": "string"
+            }
+          }
+        }
+      }
+    }
+  }
+}

charts/external-dns/values.yaml

@@ -126,5 +126,10 @@ provider: aws
 
 extraArgs: []
 
+secretConfiguration:
+  enabled: false
+  mountPath: /.aws/credentials
+  data: {}
+
 deploymentStrategy:
   type: Recreate