#!/bin/bash

# odde (Optical Drive Disabler and Enabler)
# Ben Atkin (ben@benatkin.com)
# 2009-01-05
#
# NO WARRANTY!
#
# Please only run this if you can grok the code.
#
# This will disable and enable your optical drive. It requires a restart.
# It is not known what effect other software (including software updates)
# will have on this if they do anything with this kernel extension.
#
# I created this because I've found the optical drive noise my MacBook
# makes when it comes out of sleep to be annoying at times. Unfortunately
# it still makes that noise.

ddir='/System/Library/Disabled Extensions'
dkext='/System/Library/Disabled Extensions/IODVDStorageFamily.kext'
ekext='/System/Library/Extensions/IODVDStorageFamily.kext'

check_for_root ()
{
  if [ $(id -u) != 0 ]; then
    echo "You must be root to execute this script."
    exit 67
  fi
}

case $1 in
'disable')
  check_for_root

  if [ -a "$dkext" ]; then
    echo "The optical drive has already been disabled. Try restarting."
    exit 1
  fi

  echo 'Please remove any disc(s) from your optical drive(s) and press return.'
  read

  mkdir -p "$ddir" && mv "$ekext" "$dkext"

  echo 'Your optical drive will be disabled after you restart.'
  ;;
'enable')
  check_for_root

  if [ -a "$ekext" ]; then
    echo "The optical drive is already enabled. Try restarting."
    exit 1
  fi

  mv "$dkext" "$ekext"

  echo 'Your optical drive will be enabled after you restart.'
  ;;
*)
  echo "usage: $0 disable or $0 enable"
  ;;
esac