use apply-replacement to update configMapKeyRef namespace

package-examples/ghost/Kptfile

@@ -12,3 +12,5 @@ pipeline:
       configPath: setlabels.yaml
     - image: gcr.io/kpt-fn/set-namespace:v0.3.4
       configPath: package-context.yaml
+    - image: gcr.io/kpt-fn/apply-replacements:v0.1.1
+      configPath: applyreplacements.yaml

package-examples/ghost/applyreplacements.yaml

@@ -0,0 +1,20 @@
+apiVersion: fn.kpt.dev/v1alpha1
+kind: ApplyReplacements
+metadata:
+  name: replacements-cm-namespace
+  annotations:
+    config.kubernetes.io/local-config: "true"
+replacements:
+- source:
+    kind: ConfigMap
+    name: kptfile.kpt.dev
+    fieldPath: data.name # the `set-namespace` fn-config
+  targets:
+  - select:
+      kind: Deployment
+    fieldPaths:
+    - spec.template.spec.containers.[name=ghost-app].envFrom.[=].configMapRef.namespace
+  - select:
+      kind: StatefulSet
+    fieldPaths:
+    - spec.template.spec.containers.[name=ghost-app].envFrom.[=].configMapRef.namespace

package-examples/ghost/configmap-env.yaml

@@ -0,0 +1,22 @@
+# Source: ghost/charts/mariadb/templates/primary/configmap.yaml
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: ghost-env
+  namespace: example
+data:
+  BITNAMI_DEBUG: "true"
+  ALLOW_EMPTY_PASSWORD: "yes"
+  GHOST_DATABASE_HOST: "mariadb"
+  GHOST_DATABASE_PORT_NUMBER: "3306"
+  GHOST_DATABASE_NAME: "bitnami_ghost"
+  GHOST_DATABASE_USER: "bn_ghost"
+  GHOST_HOST: EXTERNAL_IP_FROM_SERVICE
+  GHOST_PORT_NUMBER: "2368"
+  GHOST_USERNAME: "user"
+  GHOST_EMAIL: "user@example.com"
+  GHOST_BLOG_TITLE: "User's Blog"
+  GHOST_ENABLE_HTTPS: "no"
+  GHOST_EXTERNAL_HTTP_PORT_NUMBER: "80"
+  GHOST_EXTERNAL_HTTPS_PORT_NUMBER: "443"
+  GHOST_SKIP_BOOTSTRAP: "no"

package-examples/ghost/deployment-ghost.yaml

@@ -18,37 +18,10 @@ spec:
           securityContext:
             runAsNonRoot: true
             runAsUser: 1001
-          env:
-            - name: BITNAMI_DEBUG
-              value: "true"
-            - name: ALLOW_EMPTY_PASSWORD
-              value: "yes"
-            - name: GHOST_DATABASE_HOST
-              value: "mariadb"
-            - name: GHOST_DATABASE_PORT_NUMBER
-              value: "3306"
-            - name: GHOST_DATABASE_NAME
-              value: "bitnami_ghost"
-            - name: GHOST_DATABASE_USER
-              value: "bn_ghost"
-            - name: GHOST_HOST
-              value: EXTERNAL_IP_FROM_SERVICE
-            - name: GHOST_PORT_NUMBER
-              value: "2368"
-            - name: GHOST_USERNAME
-              value: "user"
-            - name: GHOST_EMAIL
-              value: "user@example.com"
-            - name: GHOST_BLOG_TITLE
-              value: "User's Blog"
-            - name: GHOST_ENABLE_HTTPS
-              value: "no"
-            - name: GHOST_EXTERNAL_HTTP_PORT_NUMBER
-              value: "80"
-            - name: GHOST_EXTERNAL_HTTPS_PORT_NUMBER
-              value: "443"
-            - name: GHOST_SKIP_BOOTSTRAP
-              value: "no"
+          envFrom:
+            - configMapRef:
+                name: ghost-env
+                namespace: example
           ports:
             - name: http
               containerPort: 2368

package-examples/ghost/statefulset-mariadb.yaml

@@ -21,15 +21,10 @@ spec:
           securityContext:
             runAsNonRoot: true
             runAsUser: 1001
-          env:
-            - name: BITNAMI_DEBUG
-              value: "true"
-            - name: MARIADB_USER
-              value: "bn_ghost"
-            - name: MARIADB_DATABASE
-              value: "bitnami_ghost"
-            - name: ALLOW_EMPTY_PASSWORD
-              value: "true"
+          envFrom:
+            - configMapRef:
+                name: ghost-env
+                namespace: example
           ports:
             - name: mysql
               containerPort: 3306