added client_windows.go

client/client_windows.go

@@ -0,0 +1,45 @@
+// Copyright 2023 Google LLC
+//
+// 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.
+
+//go:build windows
+
+package client
+
+import (
+	"fmt"
+)
+
+// WindowsDevice implements the Device interface with Linux ioctls.
+type WindowsDevice struct{}
+
+// Open is not supported on Windows.
+func (*WindowsDevice) Open(_ string) error {
+	return fmt.Errorf("Windows is unsupported")
+}
+
+// OpenDevice fails on Windows.
+func OpenDevice() (*WindowsDevice, error) {
+	return nil, fmt.Errorf("Windows is unsupported")
+}
+
+// Close is not supported on Windows.
+func (*WindowsDevice) Close() error {
+	return fmt.Errorf("Windows is unsupported")
+}
+
+// Ioctl is not supported on Windows.
+func (*WindowsDevice) Ioctl(_ uintptr, _ any) (uintptr, error) {
+	// The GuestAttestation library on Windows is closed source.
+	return 0, fmt.Errorf("Windows is unsupported")
+}