Create feature flag to disable Terraform managed files

pkg/featureflag/featureflag.go

@@ -93,12 +93,14 @@ var (
 	Azure = New("Azure", Bool(false))
 	// KopsControllerStateStore enables fetching the kops state from kops-controller, instead of requiring access to S3/GCS/etc.
 	KopsControllerStateStore = New("KopsControllerStateStore", Bool(false))
-	// APIServerNodes enables ability to provision nodes that only run the kube-apiserver
+	// APIServerNodes enables ability to provision nodes that only run the kube-apiserver.
 	APIServerNodes = New("APIServerNodes", Bool(false))
 	// UseAddonOperators activates experimental addon operator support
 	UseAddonOperators = New("UseAddonOperators", Bool(false))
 	// AWSIPv6 activates experimental AWS IPv6 support.
 	AWSIPv6 = New("AWSIPv6", Bool(false))
+	// TerraformManagedFiles enables rendering managed files into the Terraform configuration.
+	TerraformManagedFiles = New("TerraformManagedFiles", Bool(true))
 )
 
 // FeatureFlag defines a feature flag

upup/pkg/fi/fitasks/BUILD.bazel

@@ -18,6 +18,7 @@ go_library(
     visibility = ["//visibility:public"],
     deps = [
         "//pkg/acls:go_default_library",
+        "//pkg/featureflag:go_default_library",
         "//pkg/pki:go_default_library",
         "//upup/pkg/fi:go_default_library",
         "//upup/pkg/fi/cloudup/terraform:go_default_library",

upup/pkg/fi/fitasks/managedfile.go

@@ -21,6 +21,8 @@ import (
 	"fmt"
 	"os"
 
+	"k8s.io/kops/pkg/featureflag"
+
 	"k8s.io/apimachinery/pkg/util/validation/field"
 	"k8s.io/kops/pkg/acls"
 	"k8s.io/kops/upup/pkg/fi"
@@ -151,6 +153,10 @@ func getBasePath(c *fi.Context, e *ManagedFile) (vfs.Path, error) {
 
 // RenderTerraform is responsible for rendering the terraform json.
 func (f *ManagedFile) RenderTerraform(c *fi.Context, t *terraform.TerraformTarget, a, e, changes *ManagedFile) error {
+	if !featureflag.TerraformManagedFiles.Enabled() {
+		return f.Render(c, a, e, changes)
+	}
+
 	location := fi.StringValue(e.Location)
 	if location == "" {
 		return fi.RequiredField("Location")