create-minecraft-server

#!/bin/bash
#
# Simple script to create a minecraft server using a zip of server files
# for a specific server name.
# The new directory will contain the server files and belong to the minecraft
# group.
# Will also create the init script for a given server.
#

script_name=`basename $0`
server_name=$2
server_location=$3
server_dir=/home/minecraft/$server_name
escaped_server_dir=`echo $server_dir | sed s/\\\\\//\\\\\\\\\\\//g`

minecraft_user=`grep minecraft /etc/passwd | cut -d: -f1`
url_regex="^(http:|https:)\/\/.?[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(:[0-9]{1,5})?(\/.*)?$"

check_server_name() {
  if [ -z "$server_name" ]; then
    echo "Did not specify <server-name>."
    show_usage
    exit 1
  fi
}

check_server_location() {
  if [ -z "$server_location" ]; then
    echo "Did not specify <server-zip-location>."
    show_usage
    exit 1
  fi
}

create() {
  check_server_name; check_server_location;

  if [[ ! $server_location =~ $url_regex ]]; then
    echo
    echo "<server-zip-location> is not a URL"
    echo
    exit 1
  fi

  mkdir tmp
  wget -O tmp/$server_name.zip $server_location
  unzip tmp/$server_name.zip -d $server_dir

  echo "(Requires sudo)"
  sudo chgrp -R minecraft $server_name
  sudo chmod -R g+w $server_name

  rm -rf tmp
}

init_script() {
  check_server_name;
  # using fhd's System V init template for a starter script
  template_url=https://raw.githubusercontent.com/fhd/init-script-template/master/template
  mkdir tmp
  wget -O tmp/init-template $template_url

  # Run replacements for directory, command, and user for the init script
  sed s/dir=\"\"/dir=\"$escaped_server_dir\"/ tmp/init-template > tmp/init-template2
  sed s/cmd=\"\"/cmd=\"\"/ tmp/init-template2 > tmp/init-template3
  sed s/user=\"\"/user=\"minecraft\"/ tmp/init-template3 > tmp/init-template4

  sudo cp tmp/init-template4 /etc/init.d/$server_name
  rm -rf tmp

  echo
  echo "****************************************"
  echo "* Init script has been written         *"
  echo "* Use: sudo service $server_name start *"
  echo "*      for testing.                    *"
  echo "****************************************"
  echo
}

show_usage() {
  echo
  echo "Usage:"
  echo "  $script_name create <server-name> <server-zip-location>"
  echo "  $script_name init-script <server-name>"
  echo
}

if [ -z "$minecraft_user" ]; then
  echo
  echo "********************************************************"
  echo "* Cannot run script without minecraft user.            *"
  echo "* Please run 'create-minecraft-user' script first.     *"
  echo "********************************************************"
  echo
  # exit 2
fi

# Process command line options
case "$1" in
  create)
    create;
  ;;
  init-script)
    init_script;
  ;;
  *)
    show_usage;
  ;;
esac

echo
echo "Done."
echo
exit 0