From 4849a4d3c837a270a857331c0d63f77c40817fdf Mon Sep 17 00:00:00 2001
From: David Anderson <danderson@tailscale.com>
Date: Wed, 14 Apr 2021 15:35:32 -0700
Subject: [PATCH] net/dns: error out on linux if /etc/resolv.conf can't be
 read.

Signed-off-by: David Anderson <danderson@tailscale.com>
---
 net/dns/manager_linux.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/dns/manager_linux.go b/net/dns/manager_linux.go
index c7884e5f5..b9d3477d8 100644
--- a/net/dns/manager_linux.go
+++ b/net/dns/manager_linux.go
@@ -23,6 +23,9 @@ func NewOSConfigurator(logf logger.Logf, interfaceName string) (OSConfigurator,
 	if os.IsNotExist(err) {
 		return newDirectManager()
 	}
+	if err != nil {
+		return nil, fmt.Errorf("reading /etc/resolv.conf: %w", err)
+	}
 
 	switch resolvOwner(bs) {
 	case "systemd-resolved":