Add objectSelector to webhookconfiguration (#456)

templates/injector-mutating-webhook.yaml

@@ -32,6 +32,10 @@ webhooks:
     namespaceSelector:
 {{ toYaml .Values.injector.namespaceSelector | indent 6}}
 {{ end }}
+{{- if .Values.injector.objectSelector }}
+    objectSelector:
+{{ toYaml .Values.injector.objectSelector | indent 6}}
+{{ end }}
 {{- with .Values.injector.failurePolicy }}
     failurePolicy: {{.}}
 {{ end }}

test/unit/injector-mutating-webhook.bats

@@ -76,6 +76,29 @@ load _helpers
   [ "${actual}" = "true" ]
 }
 
+@test "injector/MutatingWebhookConfiguration: objectSelector empty by default" {
+  cd `chart_dir`
+  local actual=$(helm template \
+      --show-only templates/injector-mutating-webhook.yaml  \
+      --set 'injector.enabled=true' \
+      --namespace foo \
+      . | tee /dev/stderr |
+      yq '.webhooks[0].objectSelector' | tee /dev/stderr)
+  [ "${actual}" = "null" ]
+}
+
+@test "injector/MutatingWebhookConfiguration: can set objectSelector" {
+  cd `chart_dir`
+  local actual=$(helm template \
+      --show-only templates/injector-mutating-webhook.yaml  \
+      --set 'injector.enabled=true' \
+      --set 'injector.objectSelector.matchLabels.injector=true' \
+      . | tee /dev/stderr |
+      yq '.webhooks[0].objectSelector.matchLabels.injector' | tee /dev/stderr)
+
+  [ "${actual}" = "true" ]
+}
+
 @test "injector/MutatingWebhookConfiguration: failurePolicy 'Ignore' by default" {
   cd `chart_dir`
   local actual=$(helm template \

values.yaml

@@ -80,6 +80,15 @@ injector:
   #    matchLabels:
   #      sidecar-injector: enabled
   namespaceSelector: {}
+  # objectSelector is the selector for restricting the webhook to only
+  # specific labels.
+  # See https://kubernetes.io/docs/reference/access-authn-authz/extensible-admission-controllers/#matching-requests-objectselector
+  # for more details.
+  # Example:
+  # objectSelector:
+  #    matchLabels:
+  #      vault-sidecar-injector: enabled
+  objectSelector: {}
 
   # Configures failurePolicy of the webhook. The "unspecified" default behaviour deoends on the
   # API Version of the WebHook.