From 519e82b7c03f3a12cf05b142e38ca84ca70b7f09 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?=
 <marmarek@invisiblethingslab.com>
Date: Fri, 4 Dec 2020 12:28:27 +0100
Subject: [PATCH] init/functions: do not guess 'eth0' as Qubes-managed
 interface

... if it doesn't exist.
The /qubes-mac qubesdb entry is present on Qubes 4.1, but not 4.0. It is
ok to depend on it here, but keep safer fallback if this code would need
to be backported.
---
 init/functions | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/init/functions b/init/functions
index b9c44c4..ba05485 100644
--- a/init/functions
+++ b/init/functions
@@ -141,7 +141,7 @@ get_qubes_managed_iface() {
     qubes_iface="$(get_iface_from_mac "$mac")"
     if [ "x$qubes_iface" != "x" ]; then
         echo "$qubes_iface"
-    else
+    elif [ -e /sys/class/net/eth0 ]; then
         echo eth0
     fi
 }