template: render create-namespace in dry-run

Signed-off-by: kkh <kkhdevs@gmail.com>

pkg/action/install.go

@@ -70,6 +70,16 @@ const notesFileSuffix = "NOTES.txt"
 
 const defaultDirectoryPermission = 0755
 
+const createNamespaceTemplateName = "templates/helm-create-namespace.yaml"
+
+const createNamespaceTemplate = `apiVersion: v1
+kind: Namespace
+metadata:
+  name: {{ .Release.Namespace }}
+  labels:
+    name: {{ .Release.Namespace }}
+`
+
 // Install performs an installation operation.
 type Install struct {
 	cfg *Configuration
@@ -241,6 +251,21 @@ func (i *Install) installCRDs(crds []chart.CRD) error {
 	return nil
 }
 
+func addCreateNamespaceTemplate(chrt *chart.Chart) {
+	if chrt == nil {
+		return
+	}
+	for _, tmpl := range chrt.Templates {
+		if tmpl != nil && tmpl.Name == createNamespaceTemplateName {
+			return
+		}
+	}
+	chrt.Templates = append(chrt.Templates, &common.File{
+		Name: createNamespaceTemplateName,
+		Data: []byte(createNamespaceTemplate),
+	})
+}
+
 // Run executes the installation
 //
 // If DryRun is set to true, this will prepare the release, but not install it
@@ -341,6 +366,10 @@ func (i *Install) RunWithContext(ctx context.Context, ch ci.Charter, vals map[st
 		return nil, err
 	}
 
+	if i.CreateNamespace && isDryRun(i.DryRunStrategy) && i.Namespace != "" {
+		addCreateNamespaceTemplate(chrt)
+	}
+
 	if driver.ContainsSystemLabels(i.Labels) {
 		return nil, fmt.Errorf("user supplied labels contains system reserved label name. System labels: %+v", driver.GetSystemLabels())
 	}

pkg/cmd/template_test.go

@@ -96,6 +96,11 @@ func TestTemplateCmd(t *testing.T) {
 			cmd:    fmt.Sprintf("template '%s' --include-crds", chartPath),
 			golden: "output/template-with-crds.txt",
 		},
+		{
+			name:   "template with create-namespace",
+			cmd:    fmt.Sprintf("template '%s' --create-namespace --namespace create-ns", chartPath),
+			golden: "output/template-create-namespace.txt",
+		},
 		{
 			name:   "template with show-only one",
 			cmd:    fmt.Sprintf("template '%s' --show-only templates/service.yaml", chartPath),

pkg/cmd/testdata/output/template-create-namespace.txt

@@ -0,0 +1,122 @@
+---
+# Source: subchart/templates/helm-create-namespace.yaml
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: create-ns
+  labels:
+    name: create-ns
+---
+# Source: subchart/templates/subdir/serviceaccount.yaml
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: subchart-sa
+---
+# Source: subchart/templates/subdir/role.yaml
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  name: subchart-role
+rules:
+- apiGroups: [""]
+  resources: ["pods"]
+  verbs: ["get","list","watch"]
+---
+# Source: subchart/templates/subdir/rolebinding.yaml
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: subchart-binding
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: subchart-role
+subjects:
+- kind: ServiceAccount
+  name: subchart-sa
+  namespace: default
+---
+# Source: subchart/charts/subcharta/templates/service.yaml
+apiVersion: v1
+kind: Service
+metadata:
+  name: subcharta
+  labels:
+    helm.sh/chart: "subcharta-0.1.0"
+spec:
+  type: ClusterIP
+  ports:
+  - port: 80
+    targetPort: 80
+    protocol: TCP
+    name: apache
+  selector:
+    app.kubernetes.io/name: subcharta
+---
+# Source: subchart/charts/subchartb/templates/service.yaml
+apiVersion: v1
+kind: Service
+metadata:
+  name: subchartb
+  labels:
+    helm.sh/chart: "subchartb-0.1.0"
+spec:
+  type: ClusterIP
+  ports:
+  - port: 80
+    targetPort: 80
+    protocol: TCP
+    name: nginx
+  selector:
+    app.kubernetes.io/name: subchartb
+---
+# Source: subchart/templates/service.yaml
+apiVersion: v1
+kind: Service
+metadata:
+  name: subchart
+  labels:
+    helm.sh/chart: "subchart-0.1.0"
+    app.kubernetes.io/instance: "release-name"
+    kube-version/major: "1"
+    kube-version/minor: "20"
+    kube-version/version: "v1.20.0"
+spec:
+  type: ClusterIP
+  ports:
+  - port: 80
+    targetPort: 80
+    protocol: TCP
+    name: nginx
+  selector:
+    app.kubernetes.io/name: subchart
+---
+# Source: subchart/templates/tests/test-config.yaml
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: "release-name-testconfig"
+  annotations:
+    "helm.sh/hook": test
+data:
+  message: Hello World
+---
+# Source: subchart/templates/tests/test-nothing.yaml
+apiVersion: v1
+kind: Pod
+metadata:
+  name: "release-name-test"
+  annotations:
+    "helm.sh/hook": test
+spec:
+  containers:
+    - name: test
+      image: "alpine:latest"
+      envFrom:
+        - configMapRef:
+            name: "release-name-testconfig"
+      command:
+        - echo
+        - "$message"
+  restartPolicy: Never