Adding GCPMachinePool Functionality

cloud/const.go

@@ -0,0 +1,24 @@
+/*
+Copyright 2023 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 cloud
+
+const (
+	// CustomDataHashAnnotation is the key for the machine object annotation
+	// which tracks the hash of the custom data.
+	// See https://kubernetes.io/docs/concepts/overview/working-with-objects/annotations/
+	// for annotation formatting rules.
+	CustomDataHashAnnotation = "sigs.k8s.io/cluster-api-provider-gcp-mig-custom-data-hash"
+)

cloud/interfaces.go

@@ -104,3 +104,13 @@ type Machine interface {
 	MachineGetter
 	MachineSetter
 }
+
+// MachinePoolGetter is an interface which can get machine pool information.
+type MachinePoolGetter interface {
+	Project() string
+}
+
+// MachinePool is an interface which can get machine pool information.
+type MachinePool interface {
+	MachinePoolGetter
+}