Wait for TXT record to propagate (#3979)

* Wait for TXT record to propagate

* Format while loop over multiple lines

* Make command more robust to strange domain names and tokens

* Bumping version

* Update CHANGELOG.md

duckdns/CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## 1.19.0
+
+- Wait for up to 60 seconds for TXT record to propagate when deploying challenges
+
 ## 1.18.0
 
 - Update to use s6-overlay to manage service

duckdns/config.yaml

@@ -1,5 +1,5 @@
 ---
-version: 1.18.0
+version: 1.19.0
 slug: duckdns
 name: Duck DNS
 description: >-

duckdns/rootfs/root/hooks.sh

@@ -32,6 +32,11 @@ deploy_challenge() {
     #   be found in the $TOKEN_FILENAME file.
 
     curl -s "https://www.duckdns.org/update?domains=$ALIAS&token=$SYS_TOKEN&txt=$TOKEN_VALUE"
+    timeout 60s bash -c -- "
+        while ! dig -t txt \"_acme-challenge.$ALIAS\" | grep -F \"$TOKEN_VALUE\" > /dev/null; do
+            sleep 5;
+        done
+    "
 }
 
 clean_challenge() {