Support linting generateName

Signed-off-by: Charlie Getzen <charliegetzenlc@gmail.com>

pkg/lint/rules/template.go

@@ -32,6 +32,7 @@ import (
 	apipath "k8s.io/apimachinery/pkg/api/validation/path"
 	"k8s.io/apimachinery/pkg/util/validation/field"
 	"k8s.io/apimachinery/pkg/util/yaml"
+	"k8s.io/apiserver/pkg/storage/names"
 
 	"helm.sh/helm/v3/pkg/chart/loader"
 	"helm.sh/helm/v3/pkg/chartutil"
@@ -211,11 +212,15 @@ func validateYamlContent(err error) error {
 func validateMetadataName(obj *K8sYamlStruct) error {
 	fn := validateMetadataNameFunc(obj)
 	allErrs := field.ErrorList{}
-	for _, msg := range fn(obj.Metadata.Name, false) {
+	name := obj.Metadata.Name
-		allErrs = append(allErrs, field.Invalid(field.NewPath("metadata").Child("name"), obj.Metadata.Name, msg))
+	if len(name) == 0 && len(obj.Metadata.GenerateName) != 0 {
+		name = names.SimpleNameGenerator.GenerateName(obj.Metadata.GenerateName)
+	}
+	for _, msg := range fn(name, false) {
+		allErrs = append(allErrs, field.Invalid(field.NewPath("metadata").Child("name"), name, msg))
 	}
 	if len(allErrs) > 0 {
-		return errors.Wrapf(allErrs.ToAggregate(), "object name does not conform to Kubernetes naming requirements: %q", obj.Metadata.Name)
+		return errors.Wrapf(allErrs.ToAggregate(), "object name does not conform to Kubernetes naming requirements: %q", name)
 	}
 	return nil
 }
@@ -305,6 +310,7 @@ type K8sYamlStruct struct {
 }
 
 type k8sYamlMetadata struct {
-	Namespace string
+	Namespace    string
-	Name      string
+	Name         string
+	GenerateName string
 }

pkg/lint/rules/template_test.go

@@ -120,6 +120,15 @@ func TestMultiTemplateFail(t *testing.T) {
 	}
 }
 
+func TestGenerateName(t *testing.T) {
+	linter := support.Linter{ChartDir: "./testdata/generate-name"}
+	Templates(&linter, values, namespace, strict)
+	res := linter.Messages
+	if len(res) != 0 {
+		t.Fatalf("Unexpected error: %s", res[0].Err)
+	}
+}
+
 func TestValidateMetadataName(t *testing.T) {
 	tests := []struct {
 		obj     *K8sYamlStruct

pkg/lint/rules/testdata/generate-name/Chart.yaml

@@ -0,0 +1,21 @@
+apiVersion: v2
+name: generate-name
+description: A Helm chart for Kubernetes
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+version: 0.1.0
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application and it is recommended to use it with quotes.
+appVersion: "1.16.0"

pkg/lint/rules/testdata/generate-name/templates/multi-fail.yaml

@@ -0,0 +1,13 @@
+apiVersion: batch/v1
+kind: Job
+metadata:
+  generateName: test-
+spec:
+  template:
+    spec:
+      containers:
+      - name: pi
+        image: perl
+        command: ["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"]
+      restartPolicy: Never
+  backoffLimit: 4