feat: allow disabling the nginx-vhosts plugin by default

This allows us to force another plugin as the default vhost implementation, or disable it altogether in favor of some higher-level proxy implementation, such as one that integrates with service discovery.

debian/config

@@ -17,6 +17,7 @@ if [ $RET = "true" ]; then
     exit 0
 fi
 
+db_input "high" "dokku/nginx_enable" || true
 db_input "high" "dokku/hostname" || true
 db_input "high" "dokku/vhost_enable" || true
 if [ "$ACTION" != "reconfigure" ]; then

debian/postinst

@@ -59,9 +59,13 @@ case "$1" in
       fi
     done
 
+    db_get "dokku/nginx_enable"
     echo "Enabling all core plugins"
     find ${DOKKU_LIB_ROOT}/core-plugins/available -mindepth 1 -maxdepth 1 -type d -printf '%f\n' | while read -r plugin; do
-      if [ ! -d ${DOKKU_LIB_ROOT}/plugins/available/$plugin ]; then
+      if [ "$plugin" = "nginx-vhosts" ] && [ "$RET" = "false" ]; then
+        echo "Skipping enable of nginx-vhosts plugin"
+        continue
+      elif [ ! -d ${DOKKU_LIB_ROOT}/plugins/available/$plugin ]; then
         ln -s ${DOKKU_LIB_ROOT}/core-plugins/available/$plugin ${DOKKU_LIB_ROOT}/plugins/available/$plugin;
         PLUGIN_PATH=${DOKKU_LIB_ROOT}/core-plugins plugn enable $plugin
         PLUGIN_PATH=${DOKKU_LIB_ROOT}/plugins plugn enable $plugin

debian/postrm

@@ -21,7 +21,10 @@ main() {
   rm -f /etc/systemd/system/dokku-redeploy.service
   rm -f /etc/update-motd.d/99-dokku
 
-  (nginx -t && service nginx reload) || true
+  db_get "dokku/nginx_enable"
+  if [ "$RET" = "true" ]; then
+    (nginx -t && service nginx reload) || true
+  fi
 
   if [[ "$1" == "purge" ]]; then
     rm -f /etc/nginx/conf.d/dokku.conf

debian/templates

@@ -22,3 +22,8 @@ Template: dokku/key_file
 Description: Keyfile for initial user:
 Type: string
 Default: /root/.ssh/id_rsa.pub
+
+Template: dokku/nginx_enable
+Description: Enable nginx-vhosts plugin?
+Type: boolean
+Default: true