Configuration options, tweak challenge, update readme

build.sh

@@ -1,20 +1,16 @@
-NGINX_PATH=/home/simon/Downloads/nginx-1.16.1/
+if [ -z ${NGINX_PATH+x} ]; then
+  echo "Please set the NGINX_PATH variable";
+  exit
+fi
 
 MODULE_PATH=$(pwd)/
 CONFIG_ARGS=$(nginx -V 2>&1 | tail -n 1 | cut -c 21- | sed 's/--add-dynamic-module=.*//g')
-
 CONFIG_ARGS="${CONFIG_ARGS} --add-dynamic-module=${MODULE_PATH}"
-
 echo $CONFIG_ARGS
 
 (
-cd ${NGINX_PATH}
-#bash -c "./configure ${CONFIG_ARGS}"
-make modules
-#cp objs/ "${WD}"
+  cd ${NGINX_PATH} || exit
+  bash -c "./configure ${CONFIG_ARGS}"
+  make modules -j "$(nproc)"
 )
 
-rm /test/*.so
-mv /home/simon/Downloads/nginx-1.16.1/objs/ngx_http_js_challenge_module.so /test/module.so
-chown -R www-data /test/
-systemctl restart nginx