main.go

/*
Copyright 2022 Nutanix, Inc

Copyright 2016 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 main

import (
	"os"

	"k8s.io/apimachinery/pkg/util/wait"
	cloudprovider "k8s.io/cloud-provider"
	"k8s.io/cloud-provider/app"
	"k8s.io/cloud-provider/app/config"
	"k8s.io/cloud-provider/options"
	"k8s.io/component-base/cli"
	cliflag "k8s.io/component-base/cli/flag"
	_ "k8s.io/component-base/metrics/prometheus/clientgo" // for client metric registration
	_ "k8s.io/component-base/metrics/prometheus/version"  // for version metric registration
	"k8s.io/klog/v2"

	"github.com/nutanix-cloud-native/cloud-provider-nutanix/internal/constants"
	_ "github.com/nutanix-cloud-native/cloud-provider-nutanix/pkg/provider"
)

func main() {
	ccmOptions, err := options.NewCloudControllerManagerOptions()
	if err != nil {
		klog.Fatalf("unable to initialize command options: %v", err)
	}
	ccmOptions.KubeCloudShared.CloudProvider.Name = constants.ProviderName

	fss := cliflag.NamedFlagSets{}

	controllerInitializers := app.DefaultInitFuncConstructors
	delete(controllerInitializers, "service")
	delete(controllerInitializers, "route")

	command := app.NewCloudControllerManagerCommand(ccmOptions,
		cloudInitializer, controllerInitializers, map[string]string{}, fss, wait.NeverStop)

	code := cli.Run(command)
	os.Exit(code)
}

func cloudInitializer(config *config.CompletedConfig) cloudprovider.Interface {
	cloudConfig := config.ComponentConfig.KubeCloudShared.CloudProvider

	// initialize cloud provider with the cloud provider name and config file provided
	cloud, err := cloudprovider.InitCloudProvider(cloudConfig.Name, cloudConfig.CloudConfigFile)
	if err != nil {
		klog.Fatalf("Cloud provider could not be initialized: %v", err)
	}
	if cloud == nil {
		klog.Fatalf("Cloud provider is nil")
	}

	if !cloud.HasClusterID() {
		if config.ComponentConfig.KubeCloudShared.AllowUntaggedCloud {
			klog.Warning("detected a cluster without a ClusterID.  A ClusterID will be required in the future.  Please tag your cluster to avoid any future issues")
		} else {
			klog.Fatalf("no ClusterID found.  A ClusterID is required for the cloud provider to function properly.  This check can be bypassed by setting the allow-untagged-cloud option")
		}
	}
	return cloud
}