From 751ba43ef7bad38147d6fb26ea598a6f032d7b41 Mon Sep 17 00:00:00 2001
From: "geetikab@vmware.com" <geetikab@vmware.com>
Date: Wed, 1 Sep 2021 21:18:12 +0530
Subject: [PATCH] Add feature gate machinery Currently CAPG doesn't have
 capability of adding features via feature gates. This change would add
 feature gate machinery.

Signed-off-by: Geetika Batra <geetikab@vmware.com>
---
 feature/feature.go | 42 ++++++++++++++++++++++++++++++++++++++++++
 feature/gates.go   | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 76 insertions(+)
 create mode 100644 feature/feature.go
 create mode 100644 feature/gates.go

diff --git a/feature/feature.go b/feature/feature.go
new file mode 100644
index 000000000..c9cb95668
--- /dev/null
+++ b/feature/feature.go
@@ -0,0 +1,42 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package feature
+
+import (
+	"k8s.io/apimachinery/pkg/util/runtime"
+	"k8s.io/component-base/featuregate"
+)
+
+const (
+// Every capg-specific feature gate should add method here following this template:
+//
+// // owner: @username
+// // alpha: v1.X
+// MyFeature featuregate.Feature = "MyFeature".
+
+)
+
+func init() {
+	runtime.Must(MutableGates.Add(defaultCAPGFeatureGates))
+}
+
+// defaultCAPGFeatureGates consists of all known capg-specific feature keys.
+// To add a new feature, define a key for it above and add it here.
+var defaultCAPGFeatureGates = map[featuregate.Feature]featuregate.FeatureSpec{
+	// Every feature should be initiated here:
+
+}
diff --git a/feature/gates.go b/feature/gates.go
new file mode 100644
index 000000000..bf73fb3ff
--- /dev/null
+++ b/feature/gates.go
@@ -0,0 +1,34 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package feature
+
+import (
+	"k8s.io/component-base/featuregate"
+	"sigs.k8s.io/cluster-api/feature"
+)
+
+var (
+	// MutableGates is a mutable version of DefaultFeatureGate.
+	// Only top-level commands/options setup and the k8s.io/component-base/featuregate/testing package should make use of this.
+	// Tests that need to modify featuregate gates for the duration of their test should use:
+	//   defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.<FeatureName>, <value>)()
+	MutableGates featuregate.MutableFeatureGate = feature.MutableGates
+
+	// Gates is a shared global FeatureGate.
+	// Top-level commands/options setup that needs to modify this featuregate gate should use DefaultMutableFeatureGate.
+	Gates featuregate.FeatureGate = MutableGates
+)