From 6a2c43b171370ffd05d8e26c027d80f95a1416b8 Mon Sep 17 00:00:00 2001
From: Ralph Ronnquist <rrq@rrq.au>
Date: Mon, 29 Jan 2024 09:09:48 +1100
Subject: [PATCH] Handle ifupdown-without-bridge networking better.

---
 functions | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/functions b/functions
index fa1d527..8f39d40 100644
--- a/functions
+++ b/functions
@@ -103,6 +103,12 @@ setup_veth_cables() {
     for C in "$@" ; do
 	IF=$NETNS$i
 	MAC="${C#*=}"
+        if ip link show $IF > /dev/null 2>&1 ; then
+           : # The interface exists already (bad badness); let things fail
+        elif ifquery --state $IF >/dev/null 2>&1 ; then
+            # doesn't exist but has residue state; quiet cleanup
+            ifdown -f $IF > /dev/null 2>&1
+        fi
 	if [ -z "$MAC" ] ; then
 	    # set up veth with "random" mac address
 	    ip link add $IF type veth peer name eth$i netns $NETNS
-- 
2.39.2