#!/bin/bash
# A quick and dirty script to fetch the latest stable minecraft_server.jar
# URL https://s3.amazonaws.com/Minecraft.Download/versions/1.9.2/minecraft_server.1.9.2.jar

BASE_URL="https://s3.amazonaws.com/Minecraft.Download/versions"
VERSION_URL="https://launchermeta.mojang.com/mc/game/version_manifest.json"
LATEST_VER=$(wget -qO - ${VERSION_URL} | python -m json.tool | grep "\"release\":" | cut -d '"' -f 4)
# Our CURRENT_VER is stored in current_ver and we don't need no stinking error messages
source current_ver > /dev/null 2>&1

if [ ! ${CURRENT_VER:-1} = ${LATEST_VER} ] || [ ! -f minecraft_server.jar ]; then
  wget -q ${BASE_URL}/${LATEST_VER}/minecraft_server.${LATEST_VER}.jar -O minecraft_server.jar && \
    echo "CURRENT_VER=${LATEST_VER}" > current_ver
fi