IPv6 tidy-up

Re #3248

.github/workflows/test-stack-reusable-workflow.yml

@@ -190,6 +190,15 @@ jobs:
       
           docker kill test-changedetectionio-ssl
 
+      - name: Test IPv6 Mode
+        run: |
+          # IPv6 - :: bind to all interfaces inside container (like 0.0.0.0), ::1 would be localhost only
+          docker run --name test-changedetectionio-ipv6 --rm -p 5000:5000 -e LISTEN_HOST=:: -d test-changedetectionio
+          sleep 3
+          # Should return 0 (no error) when grep finds it on localhost
+          curl --retry-connrefused --retry 6 http://[::1]:5000 -v|grep -q checkbox-uuid
+          docker kill test-changedetectionio-ipv6
+
       - name: Test changedetection.io SIGTERM and SIGINT signal shutdown
         run: |
           

changedetectionio/__init__.py

@@ -65,8 +65,7 @@ def main():
 
     datastore_path = None
     do_cleanup = False
-    host = "0.0.0.0"
+    host = os.environ.get("LISTEN_HOST", "0.0.0.0").strip()
-    ipv6_enabled = False
     port = int(os.environ.get('PORT', 5000))
     ssl_mode = False
 
@@ -108,10 +107,6 @@ def main():
         if opt == '-d':
             datastore_path = arg
 
-        if opt == '-6':
-            logger.success("Enabling IPv6 listen support")
-            ipv6_enabled = True
-
         # Cleanup (remove text files that arent in the index)
         if opt == '-c':
             do_cleanup = True

docker-compose.yml

@@ -74,6 +74,11 @@ services:
   #        ./cert.pem:/app/cert.pem and ./privkey.pem:/app/privkey.pem
   #      - SSL_CERT_FILE=cert.pem
   #      - SSL_PRIVKEY_FILE=privkey.pem
+  #
+  #        LISTEN_HOST / "host", Same as -h
+  #      - LISTEN_HOST=::
+  #      - LISTEN_HOST=0.0.0.0
+
   
       # Comment out ports: when using behind a reverse proxy , enable networks: etc.
       ports: