fix: add template function for labels

Signed-off-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

charts/argo-rollouts/README.md

@@ -60,6 +60,8 @@ $ helm install --name my-release argo/argo-rollouts
 * This is a breaking change which only supports Helm v3.0.0+ now. If you still use Helm v2, please consider upgrading because v2 is EOL since November 2020.  
   To migrate to Helm v3 please have a look at the [Helm 2to3 Plugin](https://github.com/helm/helm-2to3). This tool will convert the existing ConfigMap used for Tiller to a Secret of type `helm.sh/release.v1`.
 * `quay.io` is the default registry now
+* We introduce a template function for the labels here to reduce code duplication. This also affects the Deployment `matchLabels` selector.  
+  To upgrade an existing installation, please **add the `--force` parameter** to the `helm upgrade` command or **delete the Deployment resource** before you upgrade. This is necessary because Deployment's label selector is immutable.
 * Breaking parameters update
   * `securityContext` was renamed to `containerSecurityContext`
   * Added `controller.image.registry`. Prior to this chart version you had to override the registry via `controller.image.repository`

charts/argo-rollouts/templates/_helpers.tpl

@@ -31,6 +31,27 @@ Create chart name and version as used by the chart label.
 {{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" -}}
 {{- end -}}
 
+{{/*
+Common labels
+*/}}
+{{- define "argo-rollouts.labels" -}}
+helm.sh/chart: {{ include "argo-rollouts.chart" . }}
+{{ include "argo-rollouts.selectorLabels" . }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+app.kubernetes.io/part-of: argo-rollouts
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "argo-rollouts.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "argo-rollouts.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+
 {{/*
 Create the name of the service account to use
 */}}

charts/argo-rollouts/templates/argo-rollouts-aggregate-roles.yaml

@@ -6,9 +6,7 @@ metadata:
   labels:
     rbac.authorization.k8s.io/aggregate-to-view: "true"
     app.kubernetes.io/component: {{ .Values.controller.component }}
-    app.kubernetes.io/name:  {{ .Release.Name }}-aggregate-to-view
-    app.kubernetes.io/part-of: argo-rollouts
-    app.kubernetes.io/instance: {{ .Release.Name }}
+    {{- include "argo-rollouts.labels" . | nindent 4 }}
 rules:
 - apiGroups:
   - argoproj.io
@@ -32,9 +30,7 @@ metadata:
   labels:
     rbac.authorization.k8s.io/aggregate-to-edit: "true"
     app.kubernetes.io/component: {{ .Values.controller.component }}
-    app.kubernetes.io/name:  {{ .Release.Name }}-aggregate-to-edit
-    app.kubernetes.io/part-of: argo-rollouts
-    app.kubernetes.io/instance: {{ .Release.Name }}
+    {{- include "argo-rollouts.labels" . | nindent 4 }}
 rules:
 - apiGroups:
   - argoproj.io
@@ -64,9 +60,7 @@ metadata:
   labels:
     rbac.authorization.k8s.io/aggregate-to-admin: "true"
     app.kubernetes.io/component: {{ .Values.controller.component }}
-    app.kubernetes.io/instance: {{ .Release.Name }}
-    app.kubernetes.io/name:  {{ .Release.Name }}-aggregate-to-admin
-    app.kubernetes.io/part-of: argo-rollouts
+    {{- include "argo-rollouts.labels" . | nindent 4 }}
 rules:
 - apiGroups:
   - argoproj.io

charts/argo-rollouts/templates/argo-rollouts-clusterrole.yaml

@@ -5,9 +5,7 @@ metadata:
   name: {{ include "argo-rollouts.fullname" . }}
   labels:
     app.kubernetes.io/component: {{ .Values.controller.component }}
-    app.kubernetes.io/instance: {{ .Release.Name }}
-    app.kubernetes.io/name: {{ .Release.Name }}-clusterrole
-    app.kubernetes.io/part-of: argo-rollouts
+    {{- include "argo-rollouts.labels" . | nindent 4 }}
 rules:
 - apiGroups:
   - argoproj.io

charts/argo-rollouts/templates/argo-rollouts-clusterrolebinding.yaml

@@ -5,9 +5,7 @@ metadata:
   name: {{ include "argo-rollouts.fullname" . }}
   labels:
     app.kubernetes.io/component: {{ .Values.controller.component }}
-    app.kubernetes.io/instance: {{ .Release.Name }}
-    app.kubernetes.io/name: {{ .Release.Name }}-clusterrolebinding
-    app.kubernetes.io/part-of: argo-rollouts
+    {{- include "argo-rollouts.labels" . | nindent 4 }}
 roleRef:
   apiGroup: rbac.authorization.k8s.io
   kind: ClusterRole

charts/argo-rollouts/templates/argo-rollouts-deployment.yaml

@@ -4,13 +4,11 @@ metadata:
   name: {{ include "argo-rollouts.fullname" . }}
   labels:
     app.kubernetes.io/component: {{ .Values.controller.component }}
-    app.kubernetes.io/instance: {{ .Release.Name }}
-    app.kubernetes.io/name: {{ .Release.Name }}
-    app.kubernetes.io/part-of: argo-rollouts
+    {{- include "argo-rollouts.labels" . | nindent 4 }}
 spec:
   selector:
     matchLabels:
-      app.kubernetes.io/name: {{ .Release.Name }}
+      {{- include "argo-rollouts.selectorLabels" . | nindent 6 }}
   strategy:
     type: Recreate
   template:
@@ -20,7 +18,7 @@ spec:
         {{- toYaml . | nindent 8 }}
       {{- end }}
       labels:
-        app.kubernetes.io/name: {{ .Release.Name }}
+        {{- include "argo-rollouts.selectorLabels" . | nindent 8 }}
         {{- range $key, $value := .Values.podLabels }}
         {{ $key }}: {{ $value | quote }}
         {{- end }}

charts/argo-rollouts/templates/argo-rollouts-metrics-service.yaml

@@ -5,9 +5,7 @@ metadata:
   name: {{ include "argo-rollouts.fullname" . }}-metrics
   labels:
     app.kubernetes.io/component: server
-    app.kubernetes.io/instance: {{ .Release.Name }}
-    app.kubernetes.io/name: {{ .Release.Name }}-metrics
-    app.kubernetes.io/part-of: argo-rollouts
+    {{- include "argo-rollouts.labels" . | nindent 4 }}
   {{- with .Values.serviceAnnotations }}
   annotations:
     {{- toYaml . | nindent 4 }}
@@ -19,5 +17,5 @@ spec:
     port: 8090
     targetPort: 8090
   selector:
-    app.kubernetes.io/name: {{ .Release.Name }}
+    {{- include "argo-rollouts.selectorLabels" . | nindent 6 }}
 {{- end }}

charts/argo-rollouts/templates/argo-rollouts-role.yaml

@@ -5,9 +5,7 @@ metadata:
   name: {{ include "argo-rollouts.fullname" . }}
   labels:
     app.kubernetes.io/component: {{ .Values.controller.component }}
-    app.kubernetes.io/instance: {{ .Release.Name }}
-    app.kubernetes.io/name: {{ .Release.Name }}-role
-    app.kubernetes.io/part-of: argo-rollouts
+    {{- include "argo-rollouts.labels" . | nindent 4 }}
 rules:
 - apiGroups:
   - argoproj.io

charts/argo-rollouts/templates/argo-rollouts-rolebinding.yaml

@@ -5,9 +5,7 @@ metadata:
   name: {{ include "argo-rollouts.fullname" . }}
   labels:
     app.kubernetes.io/component: {{ .Values.controller.component }}
-    app.kubernetes.io/instance: {{ .Release.Name }}
-    app.kubernetes.io/name: {{ .Release.Name }}-role-binding
-    app.kubernetes.io/part-of: argo-rollouts
+    {{- include "argo-rollouts.labels" . | nindent 4 }}
 roleRef:
   apiGroup: rbac.authorization.k8s.io
   kind: Role

charts/argo-rollouts/templates/argo-rollouts-sa.yaml

@@ -5,9 +5,7 @@ metadata:
   name: {{ include "argo-rollouts.serviceAccountName" . }}
   labels:
     app.kubernetes.io/component: {{ .Values.controller.component }}
-    app.kubernetes.io/instance: {{ .Release.Name }}
-    app.kubernetes.io/name: {{ .Release.Name }}
-    app.kubernetes.io/part-of: argo-rollouts
+    {{- include "argo-rollouts.labels" . | nindent 4 }}
   {{- with .Values.serviceAccount.annotations }}
   annotations:
     {{- toYaml . | nindent 4 }}

charts/argo-rollouts/templates/argo-rollouts-service-monitor.yaml

@@ -5,9 +5,7 @@ metadata:
   name: {{ include "argo-rollouts.fullname" . }}
   labels:
     app.kubernetes.io/component: server
-    app.kubernetes.io/instance: {{ .Release.Name }}
-    app.kubernetes.io/name: {{ .Release.Name }}-metrics
-    app.kubernetes.io/part-of: argo-rollouts
+    {{- include "argo-rollouts.labels" . | nindent 4 }}
     {{- range $key, $value := .Values.controller.metrics.serviceMonitor.additionalLabels }}
     {{ $key }}: {{ $value | quote }}
     {{- end }}
@@ -24,7 +22,5 @@ spec:
   selector:
     matchLabels:
       app.kubernetes.io/component: server
-      app.kubernetes.io/name: {{ .Release.Name }}-metrics
-      app.kubernetes.io/part-of: argo-rollouts
-      app.kubernetes.io/instance: {{ .Release.Name }}
+      {{- include "argo-rollouts.selectorLabels" . | nindent 6 }}
 {{- end }}