Update dependencies

vendor/tailscale.com/util/syspolicy/handler_windows.go

@@ -0,0 +1,105 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+package syspolicy
+
+import (
+	"errors"
+	"fmt"
+
+	"tailscale.com/util/clientmetric"
+	"tailscale.com/util/winutil"
+)
+
+var (
+	windowsErrors = clientmetric.NewCounter("windows_syspolicy_errors")
+	windowsAny    = clientmetric.NewGauge("windows_syspolicy_any")
+)
+
+type windowsHandler struct{}
+
+func init() {
+	RegisterHandler(NewCachingHandler(windowsHandler{}))
+
+	keyList := []struct {
+		isSet func(Key) bool
+		keys  []Key
+	}{
+		{
+			isSet: func(k Key) bool {
+				_, err := handler.ReadString(string(k))
+				return err == nil
+			},
+			keys: stringKeys,
+		},
+		{
+			isSet: func(k Key) bool {
+				_, err := handler.ReadBoolean(string(k))
+				return err == nil
+			},
+			keys: boolKeys,
+		},
+		{
+			isSet: func(k Key) bool {
+				_, err := handler.ReadUInt64(string(k))
+				return err == nil
+			},
+			keys: uint64Keys,
+		},
+	}
+
+	var anySet bool
+	for _, l := range keyList {
+		for _, k := range l.keys {
+			if !l.isSet(k) {
+				continue
+			}
+			clientmetric.NewGauge(fmt.Sprintf("windows_syspolicy_%s", k)).Set(1)
+			anySet = true
+		}
+	}
+	if anySet {
+		windowsAny.Set(1)
+	}
+}
+
+func (windowsHandler) ReadString(key string) (string, error) {
+	s, err := winutil.GetPolicyString(key)
+	if errors.Is(err, winutil.ErrNoValue) {
+		err = ErrNoSuchKey
+	} else if err != nil {
+		windowsErrors.Add(1)
+	}
+
+	return s, err
+}
+
+func (windowsHandler) ReadUInt64(key string) (uint64, error) {
+	value, err := winutil.GetPolicyInteger(key)
+	if errors.Is(err, winutil.ErrNoValue) {
+		err = ErrNoSuchKey
+	} else if err != nil {
+		windowsErrors.Add(1)
+	}
+	return value, err
+}
+
+func (windowsHandler) ReadBoolean(key string) (bool, error) {
+	value, err := winutil.GetPolicyInteger(key)
+	if errors.Is(err, winutil.ErrNoValue) {
+		err = ErrNoSuchKey
+	} else if err != nil {
+		windowsErrors.Add(1)
+	}
+	return value != 0, err
+}
+
+func (windowsHandler) ReadStringArray(key string) ([]string, error) {
+	value, err := winutil.GetPolicyStringArray(key)
+	if errors.Is(err, winutil.ErrNoValue) {
+		err = ErrNoSuchKey
+	} else if err != nil {
+		windowsErrors.Add(1)
+	}
+	return value, err
+}