fix: prevent internal routing issues when domain used as hostname

Author: Baptiste DE RENZO

bbb-install.sh

@@ -955,6 +955,15 @@ install_greenlight_v3(){
   # Preparing and checking the environment.
   say "preparing and checking the environment to install/update greenlight-v3..."
 
+  # Avoid error when domain used as hostname
+  # See https://github.com/bigbluebutton/greenlight/issues/6174
+  if grep -qE "^127\.[0-9]+\.[0-9]+\.[0-9]+[[:space:]]+$HOST" /etc/hosts; then
+    err "Hosts configuration issue detected: Your domain '$HOST' is mapped to localhost in /etc/hosts.
+    This is known to cause connectivity issues between Greenlight and the BigBlueButton API (see Greenlight issue #6174).
+    Please edit, comment or remove the affected line in /etc/hosts then, restart the installation script.
+    WARNING: If you are using a cloud provider, this entry may be added automatically during server deployment."
+  fi
+
   if [ ! -d $GL3_DIR ]; then
     mkdir -p $GL3_DIR && say "created $GL3_DIR"
   fi