container: support hostprocess containers and expose kubernetes labels (#1911)

internal/headers/hcs/syscall.go

@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+// Copyright The Prometheus 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.
+
+//go:build windows
+
+package hcs
+
+import (
+	"fmt"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+//nolint:gochecknoglobals
+var (
+	modComputeCore = windows.NewLazySystemDLL("computecore.dll")
+
+	procHcsCreateOperation            = modComputeCore.NewProc("HcsCreateOperation")
+	procHcsWaitForOperationResult     = modComputeCore.NewProc("HcsWaitForOperationResult")
+	procHcsCloseOperation             = modComputeCore.NewProc("HcsCloseOperation")
+	procHcsEnumerateComputeSystems    = modComputeCore.NewProc("HcsEnumerateComputeSystems")
+	procHcsOpenComputeSystem          = modComputeCore.NewProc("HcsOpenComputeSystem")
+	procHcsGetComputeSystemProperties = modComputeCore.NewProc("HcsGetComputeSystemProperties")
+	procHcsCloseComputeSystem         = modComputeCore.NewProc("HcsCloseComputeSystem")
+)
+
+// CreateOperation creates a new operation.
+func CreateOperation() (Operation, error) {
+	r1, r2, _ := procHcsCreateOperation.Call(0, 0)
+	if r2 != 0 {
+		return 0, fmt.Errorf("HcsCreateOperation failed: HRESULT 0x%X: %w", r2, Win32FromHResult(r2))
+	}
+
+	return Operation(r1), nil
+}
+
+func WaitForOperationResult(operation Operation, timeout uint32) (string, error) {
+	var resultDocument *uint16
+
+	r1, _, _ := procHcsWaitForOperationResult.Call(uintptr(operation), uintptr(timeout), uintptr(unsafe.Pointer(&resultDocument)))
+	if r1 != 0 {
+		return "", fmt.Errorf("HcsWaitForOperationResult failed: HRESULT 0x%X: %w", r1, Win32FromHResult(r1))
+	}
+
+	result := windows.UTF16PtrToString(resultDocument)
+	windows.CoTaskMemFree(unsafe.Pointer(resultDocument))
+
+	return result, nil
+}
+
+// CloseOperation closes an operation.
+func CloseOperation(operation Operation) {
+	_, _, _ = procHcsCloseOperation.Call(uintptr(operation))
+}
+
+// EnumerateComputeSystems enumerates compute systems.
+//
+// https://learn.microsoft.com/en-us/virtualization/api/hcs/reference/hcsenumeratecomputesystems
+func EnumerateComputeSystems(query *uint16, operation Operation) error {
+	r1, _, _ := procHcsEnumerateComputeSystems.Call(uintptr(unsafe.Pointer(query)), uintptr(operation))
+	if r1 != 0 {
+		return fmt.Errorf("HcsEnumerateComputeSystems failed: HRESULT 0x%X: %w", r1, Win32FromHResult(r1))
+	}
+
+	return nil
+}
+
+// OpenComputeSystem opens a handle to an existing compute system.
+//
+// https://learn.microsoft.com/en-us/virtualization/api/hcs/reference/hcsopencomputesystem
+func OpenComputeSystem(id string) (ComputeSystem, error) {
+	idPtr, err := windows.UTF16PtrFromString(id)
+	if err != nil {
+		return 0, err
+	}
+
+	var system ComputeSystem
+
+	r1, _, _ := procHcsOpenComputeSystem.Call(
+		uintptr(unsafe.Pointer(idPtr)),
+		uintptr(windows.GENERIC_ALL),
+		uintptr(unsafe.Pointer(&system)),
+	)
+	if r1 != 0 {
+		return 0, fmt.Errorf("HcsOpenComputeSystem failed: HRESULT 0x%X: %w", r1, Win32FromHResult(r1))
+	}
+
+	return system, nil
+}
+
+func GetComputeSystemProperties(system ComputeSystem, operation Operation, propertyQuery *uint16) error {
+	r1, _, err := procHcsGetComputeSystemProperties.Call(
+		uintptr(system),
+		uintptr(operation),
+		uintptr(unsafe.Pointer(propertyQuery)),
+	)
+	if r1 != 0 {
+		return fmt.Errorf("HcsGetComputeSystemProperties failed: HRESULT 0x%X: %w", r1, err)
+	}
+
+	return nil
+}
+
+// CloseComputeSystem closes a handle to a compute system.
+//
+// https://learn.microsoft.com/en-us/virtualization/api/hcs/reference/hcsclosecomputesystem
+func CloseComputeSystem(system ComputeSystem) {
+	_, _, _ = procHcsCloseComputeSystem.Call(uintptr(system))
+}
+
+func Win32FromHResult(hr uintptr) windows.Errno {
+	if hr&0x1fff0000 == 0x00070000 {
+		return windows.Errno(hr & 0xffff)
+	}
+
+	return windows.Errno(hr)
+}