Establish default CloudConfiguration values

pkg/model/components/BUILD.bazel

@@ -6,6 +6,7 @@ go_library(
         "apiserver.go",
         "calico.go",
         "cilium.go",
+        "cloudconfiguration.go",
         "clusterautoscaler.go",
         "containerd.go",
         "context.go",

pkg/model/components/cloudconfiguration.go

@@ -0,0 +1,48 @@
+/*
+Copyright 2021 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 components
+
+import (
+	"k8s.io/kops/pkg/apis/kops"
+	"k8s.io/kops/upup/pkg/fi"
+	"k8s.io/kops/upup/pkg/fi/loader"
+)
+
+// CloudConfigurationOptionsBuilder prepares settings related to the backing cloud provider.
+type CloudConfigurationOptionsBuilder struct {
+	Context *OptionsContext
+}
+
+var _ loader.OptionsBuilder = &CloudConfigurationOptionsBuilder{}
+
+func (b *CloudConfigurationOptionsBuilder) BuildOptions(o interface{}) error {
+	clusterSpec := o.(*kops.ClusterSpec)
+	c := clusterSpec.CloudConfig
+	if c == nil {
+		c = &kops.CloudConfiguration{}
+		clusterSpec.CloudConfig = c
+	}
+
+	if c.ManageStorageClasses == nil {
+		c.ManageStorageClasses = fi.Bool(true)
+	}
+
+	// NB: See file openstack.go for establishing default values for the CloudConfig.Openstack
+	// field.
+
+	return nil
+}

upup/pkg/fi/cloudup/populate_cluster_spec.go

@@ -273,6 +273,7 @@ func (c *populateClusterSpec) run(clientset simple.Clientset) error {
 			codeModels = append(codeModels, &components.KubeControllerManagerOptionsBuilder{OptionsContext: optionsContext})
 			codeModels = append(codeModels, &components.KubeSchedulerOptionsBuilder{OptionsContext: optionsContext})
 			codeModels = append(codeModels, &components.KubeProxyOptionsBuilder{Context: optionsContext})
+			codeModels = append(codeModels, &components.CloudConfigurationOptionsBuilder{Context: optionsContext})
 			codeModels = append(codeModels, &components.CalicoOptionsBuilder{Context: optionsContext})
 			codeModels = append(codeModels, &components.CiliumOptionsBuilder{Context: optionsContext})
 			codeModels = append(codeModels, &components.OpenStackOptionsBulder{Context: optionsContext})