Use Env expansion for namespace in args

When deploying the controller to a custom namespace, users have to
overwrite the namespace attribute as well as the hardcoded namespace
values in a number of args for the Deployment and the admission
controller Jobs.

Instead, this commit, uses the namespace name from the DownwardAPI,
and allows users to simply change the namespace attribute without
having to worry about the container args.

charts/ingress-nginx/templates/_helpers.tpl

@@ -48,7 +48,7 @@ Users can provide an override for an explicit service they want bound via `.Valu
 
 */}}
 {{- define "ingress-nginx.controller.publishServicePath" -}}
-{{- $defServiceName := printf "%s/%s" .Release.Namespace (include "ingress-nginx.controller.fullname" .) -}}
+{{- $defServiceName := printf "%s/%s" "$(POD_NAMESPACE)" (include "ingress-nginx.controller.fullname" .) -}}
 {{- $servicePath := default $defServiceName .Values.controller.publishService.pathOverride }}
 {{- print $servicePath | trimSuffix "-" -}}
 {{- end -}}

charts/ingress-nginx/templates/admission-webhooks/job-patch/job-createSecret.yaml

@@ -38,9 +38,14 @@ spec:
           imagePullPolicy: {{ .Values.controller.admissionWebhooks.patch.image.pullPolicy }}
           args:
             - create
-            - --host={{ include "ingress-nginx.controller.fullname" . }}-admission,{{ include "ingress-nginx.controller.fullname" . }}-admission.{{ .Release.Namespace }}.svc
+            - --host={{ include "ingress-nginx.controller.fullname" . }}-admission,{{ include "ingress-nginx.controller.fullname" . }}-admission.$(POD_NAMESPACE).svc
-            - --namespace={{ .Release.Namespace }}
+            - --namespace=$(POD_NAMESPACE)
             - --secret-name={{ include "ingress-nginx.fullname" . }}-admission
+          env:
+            - name: POD_NAMESPACE
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.namespace
       restartPolicy: OnFailure
       serviceAccountName: {{ include "ingress-nginx.fullname" . }}-admission
     {{- if .Values.controller.admissionWebhooks.patch.nodeSelector }}

charts/ingress-nginx/templates/admission-webhooks/job-patch/job-patchWebhook.yaml

@@ -39,10 +39,15 @@ spec:
           args:
             - patch
             - --webhook-name={{ include "ingress-nginx.fullname" . }}-admission
-            - --namespace={{ .Release.Namespace }}
+            - --namespace=$(POD_NAMESPACE)
             - --patch-mutating=false
             - --secret-name={{ include "ingress-nginx.fullname" . }}-admission
             - --patch-failure-policy={{ .Values.controller.admissionWebhooks.failurePolicy }}
+          env:
+            - name: POD_NAMESPACE
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.namespace
       restartPolicy: OnFailure
       serviceAccountName: {{ include "ingress-nginx.fullname" . }}-admission
     {{- if .Values.controller.admissionWebhooks.patch.nodeSelector }}

charts/ingress-nginx/templates/controller-deployment.yaml

@@ -71,22 +71,22 @@ spec:
           args:
             - /nginx-ingress-controller
           {{- if .Values.defaultBackend.enabled }}
-            - --default-backend-service={{ .Release.Namespace }}/{{ include "ingress-nginx.defaultBackend.fullname" . }}
+            - --default-backend-service=$(POD_NAMESPACE)/{{ include "ingress-nginx.defaultBackend.fullname" . }}
           {{- end }}
           {{- if .Values.controller.publishService.enabled }}
             - --publish-service={{ template "ingress-nginx.controller.publishServicePath" . }}
           {{- end }}
             - --election-id={{ .Values.controller.electionID }}
             - --ingress-class={{ .Values.controller.ingressClass }}
-            - --configmap={{ .Release.Namespace }}/{{ include "ingress-nginx.controller.fullname" . }}
+            - --configmap=$(POD_NAMESPACE)/{{ include "ingress-nginx.controller.fullname" . }}
           {{- if .Values.tcp }}
-            - --tcp-services-configmap={{ .Release.Namespace }}/{{ include "ingress-nginx.fullname" . }}-tcp
+            - --tcp-services-configmap=$(POD_NAMESPACE)/{{ include "ingress-nginx.fullname" . }}-tcp
           {{- end }}
           {{- if .Values.udp }}
-            - --udp-services-configmap={{ .Release.Namespace }}/{{ include "ingress-nginx.fullname" . }}-udp
+            - --udp-services-configmap=$(POD_NAMESPACE)/{{ include "ingress-nginx.fullname" . }}-udp
           {{- end }}
           {{- if .Values.controller.scope.enabled }}
-            - --watch-namespace={{ default .Release.Namespace .Values.controller.scope.namespace }}
+            - --watch-namespace={{ default "$(POD_NAMESPACE)" .Values.controller.scope.namespace }}
           {{- end }}
           {{- if and .Values.controller.reportNodeInternalIp .Values.controller.hostNetwork }}
             - --report-node-internal-ip-address={{ .Values.controller.reportNodeInternalIp }}