Update dependencies

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

@@ -0,0 +1,143 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Package syspolicy provides functions to retrieve system settings of a device.
+package syspolicy
+
+import (
+	"errors"
+	"time"
+
+	"tailscale.com/util/syspolicy/internal/loggerx"
+	"tailscale.com/util/syspolicy/setting"
+)
+
+func GetString(key Key, defaultValue string) (string, error) {
+	markHandlerInUse()
+	v, err := handler.ReadString(string(key))
+	if errors.Is(err, ErrNoSuchKey) {
+		return defaultValue, nil
+	}
+	return v, err
+}
+
+func GetUint64(key Key, defaultValue uint64) (uint64, error) {
+	markHandlerInUse()
+	v, err := handler.ReadUInt64(string(key))
+	if errors.Is(err, ErrNoSuchKey) {
+		return defaultValue, nil
+	}
+	return v, err
+}
+
+func GetBoolean(key Key, defaultValue bool) (bool, error) {
+	markHandlerInUse()
+	v, err := handler.ReadBoolean(string(key))
+	if errors.Is(err, ErrNoSuchKey) {
+		return defaultValue, nil
+	}
+	return v, err
+}
+
+func GetStringArray(key Key, defaultValue []string) ([]string, error) {
+	markHandlerInUse()
+	v, err := handler.ReadStringArray(string(key))
+	if errors.Is(err, ErrNoSuchKey) {
+		return defaultValue, nil
+	}
+	return v, err
+}
+
+// GetPreferenceOption loads a policy from the registry that can be
+// managed by an enterprise policy management system and allows administrative
+// overrides of users' choices in a way that we do not want tailcontrol to have
+// the authority to set. It describes user-decides/always/never options, where
+// "always" and "never" remove the user's ability to make a selection. If not
+// present or set to a different value, "user-decides" is the default.
+func GetPreferenceOption(name Key) (setting.PreferenceOption, error) {
+	s, err := GetString(name, "user-decides")
+	if err != nil {
+		return setting.ShowChoiceByPolicy, err
+	}
+	var opt setting.PreferenceOption
+	err = opt.UnmarshalText([]byte(s))
+	return opt, err
+}
+
+// GetVisibility loads a policy from the registry that can be managed
+// by an enterprise policy management system and describes show/hide decisions
+// for UI elements. The registry value should be a string set to "show" (return
+// true) or "hide" (return true). If not present or set to a different value,
+// "show" (return false) is the default.
+func GetVisibility(name Key) (setting.Visibility, error) {
+	s, err := GetString(name, "show")
+	if err != nil {
+		return setting.VisibleByPolicy, err
+	}
+	var visibility setting.Visibility
+	visibility.UnmarshalText([]byte(s))
+	return visibility, nil
+}
+
+// GetDuration loads a policy from the registry that can be managed
+// by an enterprise policy management system and describes a duration for some
+// action. The registry value should be a string that time.ParseDuration
+// understands. If the registry value is "" or can not be processed,
+// defaultValue is returned instead.
+func GetDuration(name Key, defaultValue time.Duration) (time.Duration, error) {
+	opt, err := GetString(name, "")
+	if opt == "" || err != nil {
+		return defaultValue, err
+	}
+	v, err := time.ParseDuration(opt)
+	if err != nil || v < 0 {
+		return defaultValue, nil
+	}
+	return v, nil
+}
+
+// SelectControlURL returns the ControlURL to use based on a value in
+// the registry (LoginURL) and the one on disk (in the GUI's
+// prefs.conf). If both are empty, it returns a default value. (It
+// always return a non-empty value)
+//
+// See https://github.com/tailscale/tailscale/issues/2798 for some background.
+func SelectControlURL(reg, disk string) string {
+	const def = "https://controlplane.tailscale.com"
+
+	// Prior to Dec 2020's commit 739b02e6, the installer
+	// wrote a LoginURL value of https://login.tailscale.com to the registry.
+	const oldRegDef = "https://login.tailscale.com"
+
+	// If they have an explicit value in the registry, use it,
+	// unless it's an old default value from an old installer.
+	// Then we have to see which is better.
+	if reg != "" {
+		if reg != oldRegDef {
+			// Something explicit in the registry that we didn't
+			// set ourselves by the installer.
+			return reg
+		}
+		if disk == "" {
+			// Something in the registry is better than nothing on disk.
+			return reg
+		}
+		if disk != def && disk != oldRegDef {
+			// The value in the registry is the old
+			// default (login.tailscale.com) but the value
+			// on disk is neither our old nor new default
+			// value, so it must be some custom thing that
+			// the user cares about. Prefer the disk value.
+			return disk
+		}
+	}
+	if disk != "" {
+		return disk
+	}
+	return def
+}
+
+// SetDebugLoggingEnabled controls whether spammy debug logging is enabled.
+func SetDebugLoggingEnabled(v bool) {
+	loggerx.SetDebugLoggingEnabled(v)
+}