From 7211e6db1b8322a259b96178ccd9b711c6cf7426 Mon Sep 17 00:00:00 2001
From: Elias Naur <mail@eliasnaur.com>
Date: Sat, 25 Jul 2020 12:45:16 +0200
Subject: [PATCH] cmd/tailscale: tee log output to both Tailscale and the
 Android log

Updates tailscale/tailscale#471

Signed-off-by: Elias Naur <mail@eliasnaur.com>
---
 cmd/tailscale/backend.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/cmd/tailscale/backend.go b/cmd/tailscale/backend.go
index b295fa8..b73835c 100644
--- a/cmd/tailscale/backend.go
+++ b/cmd/tailscale/backend.go
@@ -7,6 +7,7 @@ package main
 import (
 	"errors"
 	"fmt"
+	"io"
 	"log"
 	"path/filepath"
 	"reflect"
@@ -301,7 +302,10 @@ func (b *backend) SetupLogs(logDir string, logID logtail.PrivateID) {
 	b.logger = logtail.Log(logcfg, logf)
 
 	log.SetFlags(0)
-	log.SetOutput(b.logger)
+	log.SetOutput(io.MultiWriter(
+		log.Writer(),
+		b.logger,
+	))
 
 	log.Printf("goSetupLogs: success")