Update dependencies

vendor/tailscale.com/util/syspolicy/internal/loggerx/logger.go

@@ -0,0 +1,64 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Package loggerx provides logging functions to the rest of the syspolicy packages.
+package loggerx
+
+import (
+	"log"
+	"sync/atomic"
+
+	"tailscale.com/types/lazy"
+	"tailscale.com/types/logger"
+	"tailscale.com/util/syspolicy/internal"
+)
+
+const (
+	normalPrefix  = "syspolicy: "
+	verbosePrefix = "syspolicy: [v2] "
+)
+
+var (
+	debugLogging atomic.Bool // whether debugging logging is enabled
+
+	lazyPrintf   lazy.SyncValue[logger.Logf]
+	lazyVerbosef lazy.SyncValue[logger.Logf]
+)
+
+// SetDebugLoggingEnabled controls whether spammy debug logging is enabled.
+func SetDebugLoggingEnabled(v bool) {
+	debugLogging.Store(v)
+}
+
+// Errorf formats and writes an error message to the log.
+func Errorf(format string, args ...any) {
+	printf(format, args...)
+}
+
+// Verbosef formats and writes an optional, verbose message to the log.
+func Verbosef(format string, args ...any) {
+	if debugLogging.Load() {
+		printf(format, args...)
+	} else {
+		verbosef(format, args...)
+	}
+}
+
+func printf(format string, args ...any) {
+	lazyPrintf.Get(func() logger.Logf {
+		return logger.WithPrefix(log.Printf, normalPrefix)
+	})(format, args...)
+}
+
+func verbosef(format string, args ...any) {
+	lazyVerbosef.Get(func() logger.Logf {
+		return logger.WithPrefix(log.Printf, verbosePrefix)
+	})(format, args...)
+}
+
+// SetForTest sets the specified printf and verbosef functions for the duration
+// of tb and its subtests.
+func SetForTest(tb internal.TB, printf, verbosef logger.Logf) {
+	lazyPrintf.SetForTest(tb, printf, nil)
+	lazyVerbosef.SetForTest(tb, verbosef, nil)
+}