fix nginx shell script for sub

sub/start.sh

@@ -17,15 +17,21 @@ fi
 
 nohup /base/subconverter & echo "启动成功"
 
-sed -i '$d' /etc/nginx/conf.d/default.conf
-sed -i '$d' /etc/nginx/conf.d/default.conf
-sed -i '$d' /etc/nginx/conf.d/default.conf
-cat >> /etc/nginx/conf.d/default.conf <<EOF
+init_nginx (){
+  sed -i '$d' /etc/nginx/conf.d/default.conf
+  sed -i '$d' /etc/nginx/conf.d/default.conf
+  sed -i '$d' /etc/nginx/conf.d/default.conf
+  cat >> /etc/nginx/conf.d/default.conf <<EOF
     location ~* /(sub|render|getruleset|surge2clash|getprofile) {
         proxy_redirect off;
         proxy_pass http://127.0.0.1:25500;
     }
   }
 EOF
+}
+
+if [[ ! $(cat /etc/nginx/conf.d/default.conf | grep 25500) ]]; then
+	init_nginx
+fi
 
 nginx -g "daemon off;"