minecraft.sh

#!/bin/bash
# To use this script:
# wget -qO- https://gist.github.com/ClayFreeman/a4dae9b7d0fa2c6476eb/raw | sh

echo

# Store pre-script working directory
export PAST_PWD=`pwd`
# Store MB of RAM available
export RAM_MB=`free -m | egrep '^Mem' | awk '{print $2}'`
# Define Spigot download URL (I like short lines, excuse the workaround)
export SPIGOT="https://hub.spigotmc.org/jenkins/job/BuildTools/"
export SPIGOT="${SPIGOT}lastSuccessfulBuild/artifact/target/BuildTools.jar"

# Refuse to build if ~/minecraft/minecraft.jar exists
if [ -f ~/minecraft/minecraft.jar ];
then
  echo "To rebuild Minecraft, run \`mv ~/minecraft/minecraft.jar ~/mc.old.jar\`"
else
  echo "This script can take anywhere from 10 minutes or beyond."
  echo "Wait 5 seconds, or press Control+C to quit."
  echo
  sleep 5

  echo "Upgrading this server and installing required packages..."
  sudo apt-get update > /dev/null 2>&1
  sudo apt-get upgrade -y --force-yes > /dev/null 2>&1
  sudo apt-get install -y --force-yes git htop iftop iotop iptraf \
    openjdk-7-jdk openjdk-7-jre-headless screen vnstat > /dev/null 2>&1

  if [ -f ~/.mcbuild ];
  then
    echo "Cleaning previous build..."
    rm -rf ~/.mcbuild
  fi

  echo "Building Spigot (this can take a while)..."
  mkdir -p ~/.mcbuild
  wget -qO ~/.mcbuild/BuildTools.jar $SPIGOT > ~/.mcbuild/buildScript.log 2>&1
  cd ~/.mcbuild && java -jar BuildTools.jar >> ~/.mcbuild/buildScript.log 2>&1

  echo "Installing Spigot..."
  mkdir -p ~/minecraft && \
  cp ~/.mcbuild/Spigot/Spigot-Server/target/spigot-*-SNAPSHOT.jar \
    ~/minecraft/minecraft.jar >> ~/.mcbuild/buildScript.log 2>&1

  echo "Creating start script..."
  echo '#!/bin/bash' > ~/minecraft/start.sh
  echo "screen -wipe > /dev/null" >> ~/minecraft/start.sh
  echo "if screen -list | grep -q 'minecraft';" >> ~/minecraft/start.sh
  echo "then" >> ~/minecraft/start.sh
  echo "  echo 'Minecraft is already running...'" >> ~/minecraft/start.sh
  echo "  echo 'View console: \`screen -dR minecraft\`'" >> ~/minecraft/start.sh
  echo "  exit 1" >> ~/minecraft/start.sh
  echo "fi" >> ~/minecraft/start.sh
  echo "cd ~/minecraft && screen -dmS minecraft java -Xmx${RAM_MB}M \\" \
    >> ~/minecraft/start.sh
  echo "  -Xms${RAM_MB}M -XX:MaxPermSize=${RAM_MB}M -jar minecraft.jar nogui" \
    >> ~/minecraft/start.sh
  echo "echo 'Minecraft has been started.'" >> ~/minecraft/start.sh
  echo "echo 'View console: \`screen -dR minecraft\`'" >> ~/minecraft/start.sh
  chmod +x ~/minecraft/start.sh >> ~/.mcbuild/buildScript.log 2>&1
  echo
  echo "Install Complete! Check ~/.mcbuild/buildScript.log if you have problems"
fi

echo "eula=true" > ~/minecraft/eula.txt
echo
echo "To start Minecraft (cmd):"
echo "  ~/minecraft/start.sh"
echo
echo "To view the console (cmd):"
echo "  screen -dR minecraft"

# Change to pre-script working directory
cd $PAST_PWD

echo
if [ -f /var/run/reboot-required ];
  then
  cat /var/run/reboot-required
  echo
fi