From 2b947b3b4012d6f0c35000c81159c5ff060478d1 Mon Sep 17 00:00:00 2001
From: David Crawshaw <crawshaw@tailscale.com>
Date: Tue, 11 Feb 2020 15:08:07 -0500
Subject: [PATCH] controlclient: handle nil Logf option

---
 control/controlclient/auto.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/control/controlclient/auto.go b/control/controlclient/auto.go
index ebcf120d8..7ff11926f 100644
--- a/control/controlclient/auto.go
+++ b/control/controlclient/auto.go
@@ -142,6 +142,9 @@ func NewNoStart(opts Options) (*Client, error) {
 	if err != nil {
 		return nil, err
 	}
+	if opts.Logf == nil {
+		opts.Logf = func(fmt string, args ...interface{}) {}
+	}
 	c := &Client{
 		direct:   direct,
 		timeNow:  opts.TimeNow,