#!/usr/bin/env bash

if [ ! -d "/app/conf" ]; then
  mkdir /app/conf
fi

if [ ! -f "/app/conf/config.json" ]; then
  cp /conf/config.sample.json /app/conf/config.json
elif [ "/conf/config.sample.json" -nt "/app/conf/config.json" ]; then
  echo "example config file is newer than existing config."
  echo "replacing existing file by new config"

  CONFIG_BACKUP="/app/conf/config_$(date +"%Y%m%d_%H%M%s").json"

  echo "saving existing config as ${CONFIG_BACKUP}"

  cp /app/conf/config.json ${CONFIG_BACKUP}
  cp /conf/config.sample.json /app/conf/config.json
fi

if [ -z "$@" ] ; then
  exec "/app/dns-proxy-server" -XX:MaxHeapSize=50m -XX:MaxNewSize=10m
else
  exec "$@"
fi