From ed2cf77afcf822f6e2551324a07a4daf66aacf9e Mon Sep 17 00:00:00 2001
From: tim <tim@treehouse.org.za>
Date: Sat, 8 Mar 2025 06:27:04 +0200
Subject: [PATCH] update_ip: add offline check, for my faulty wireless card

---
 update_ip.sh | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/update_ip.sh b/update_ip.sh
index 199f5db..9a742e0 100755
--- a/update_ip.sh
+++ b/update_ip.sh
@@ -1,11 +1,19 @@
 #!/bin/sh
 
+ping -qc 1 "${server}" > /dev/null
+if [ ${?} != 0 ]; then
+  # We are offline
+  exit
+fi
+
 cache=.update_ip.cache
 server=ns1.example.com
 zone=dyn.example.com
 host=desktop
 secret=""
-iface=$( ip route get $( dig +short ${server} | grep [0-9] ) | grep -Po '(?<=(dev ))(\S+)' )
+
+server_ip=$( dig +short ${server} | grep [0-9] | head -1 )
+iface=$( ip route get ${server_ip} | grep -Po '(?<=(dev ))(\S+)' )
 
 # TODO trigger not via cron, but using ip monitor in a while/sleep loop:
 #ip monitor address dev ${iface} | while read event; do