Set ARMClientOptions for Azure Stack

Sets ARM Client Options when using the Azure Stack environment.
Sets the APIVersion to a hybrid cloud profile to ensure compatibility
with hybrid environments.

Author: patrickdillon

azure/defaults.go

@@ -27,6 +27,7 @@ import (
 	"github.com/Azure/azure-sdk-for-go/sdk/azcore/policy"
 	"github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/compute/armcompute/v5"
 	"github.com/Azure/azure-sdk-for-go/sdk/tracing/azotel"
+	azureautorest "github.com/Azure/go-autorest/autorest/azure"
 	"go.opentelemetry.io/otel"
 
 	"sigs.k8s.io/cluster-api-provider-azure/util/tele"
@@ -111,6 +112,12 @@ const (
 	CustomHeaderPrefix = "infrastructure.cluster.x-k8s.io/custom-header-"
 )
 
+const (
+	// StackAPIVersionProfile is the API version profile to set for ARM clients. See:
+	// https://learn.microsoft.com/en-us/azure-stack/user/azure-stack-profiles-azure-resource-manager-versions?view=azs-2408#overview-of-the-2020-09-01-hybrid-profile
+	StackAPIVersionProfile = "2020-06-01"
+)
+
 var (
 	// LinuxBootstrapExtensionCommand is the command the VM bootstrap extension will execute to verify Linux nodes bootstrap completes successfully.
 	LinuxBootstrapExtensionCommand = fmt.Sprintf("for i in $(seq 1 %d); do test -f %s && break; if [ $i -eq %d ]; then echo 'Error joining node to cluster: kubeadm init or join failed. To debug, check the cloud-init, kubelet, or other bootstrap logs: https://capz.sigs.k8s.io/self-managed/troubleshooting.html#checking-cloud-init-logs-ubuntu'; exit 1; else sleep %d; fi; done", bootstrapExtensionRetries, bootstrapSentinelFile, bootstrapExtensionRetries, bootstrapExtensionSleep)
@@ -369,6 +376,21 @@ func ARMClientOptions(azureEnvironment string, extraPolicies ...policy.Policy) (
 		opts.Cloud = cloud.AzureChina
 	case USGovernmentCloudName:
 		opts.Cloud = cloud.AzureGovernment
+	case StackCloudName:
+		cloudEnv, err := azureautorest.EnvironmentFromName(azureEnvironment)
+		if err != nil {
+			return nil, fmt.Errorf("unable to get Azure Stack cloud environment: %w", err)
+		}
+		opts.APIVersion = StackAPIVersionProfile
+		opts.Cloud = cloud.Configuration{
+			ActiveDirectoryAuthorityHost: cloudEnv.ActiveDirectoryEndpoint,
+			Services: map[cloud.ServiceName]cloud.ServiceConfiguration{
+				cloud.ResourceManager: {
+					Audience: cloudEnv.TokenAudience,
+					Endpoint: cloudEnv.ResourceManagerEndpoint,
+				},
+			},
+		}
 	case "":
 		// No cloud name provided, so leave at defaults.
 	default: