From 90a418801d5b3669e10ef627886d893e9a749bd9 Mon Sep 17 00:00:00 2001
From: Tim Kimber <tkimber@mobius.org.uk>
Date: Tue, 15 Sep 2020 15:04:49 +0100
Subject: [PATCH] Add retry logic for "Bad Gateway" duckdns error

---
 dns_scripts/dns_add_duckdns | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/dns_scripts/dns_add_duckdns b/dns_scripts/dns_add_duckdns
index 9f61c8c..9d1776a 100755
--- a/dns_scripts/dns_add_duckdns
+++ b/dns_scripts/dns_add_duckdns
@@ -10,8 +10,17 @@ fi
 
 domain="$1"
 txtvalue="$2"
+i=1
 
 response=$(curl --retry 5 --silent "https://www.duckdns.org/update?domains=${domain}&token=${token}&txt=${txtvalue}")
+
+while [[ "${response}" == *"502 Bad Gateway"* ]] && [ $i -le 5 ]; do
+    echo "Retrying Bad Gateway response (attempt $i of 5)"
+    sleep 5
+    i=$((i+1))
+    response=$(curl --retry 5 --silent "https://www.duckdns.org/update?domains=${domain}&token=${token}&txt=${txtvalue}")
+done
+
 if [ "$response" != "OK" ]; then
     echo "Failed to update TXT record for ${domain} at duckdns.org (is the TOKEN valid?)"
     echo "Response: $response"