#!/bin/bash
# This will unpack Tiger's J2SE (Release 1) onto a Panther system.
# corey.jewett (at) gmail.com
#
# No warranty implied or otherwise.
##
# v 0.2: Now installs the JDK and Documentation dmgs. Also won't overwrite 1.4's Jar Launcher on successive executions.
#
# Just run with the first argument as the path to the dmg files.

DMG_PATH=$1;

# consts
JDK_DMG="$DMG_PATH/Java15Release1.dmg"
JDK_MOUNT="/Volumes/J2SE 5.0 Release 1";
JDK_ARCHIVE_PATH="$JDK_MOUNT/Java15Release1.pkg/Contents/Archive.pax.gz";

DOC_DMG="$DMG_PATH/Java15Release1Documentation.dmg"
DOC_MOUNT="/Volumes/J2SE 5.0 Release 1 Developer";
DOC_ARCHIVE_PATH="$DOC_MOUNT/Java15Release1Documentation.pkg/Contents/Archive.pax.gz";

# functions 
function help {
  echo "Get DMGs here:";
  echo "JDK: http://www.apple.com/support/downloads/java2se50release1.html";
  echo "Doc: http://www.apple.com/support/downloads/java2se50developerdocumentation.html";
  exit 1;
}

function fakesudo {
  echo "Authorization required, you may be prompted... ";
  sudo echo "authorized.";
}

function unpackdmg {
  DMG=$1;
  MOUNT=$2;
  ARCHIVE_PATH=$3;
  
  if [ ! -e "$MOUNT" ]; then
    echo "Mounting $DMG";
    hdiutil mount $DMG;
  fi
  
  echo "Installation starting, this will take a few minutes.";
  sleep 3;
  cd /;
  gunzip -c "$ARCHIVE_PATH" | sudo pax -vr;
  echo;
  echo "Unpacking complete.";

  echo "Unmounting $MOUNT";
  umount "$MOUNT";
}

# start of script
if [ -z "$1" ]; then
  echo "$0 ";
  echo;
  help;
fi

echo;
echo "About to unpack Tiger's J2SE 5.0 onto an unsupported operating system."
echo "This is operation is not recommended or supported by anyone."
echo "It may corrupt your system or render your current JDK inoperable."
echo "It might even fry your hardware or void your warranty. Who knows."
echo "You claim all responsibility for running this script."
echo;
read -p "Continue Install? (y/N)> " PROMPT;

if [ $PROMPT == 'y' -o $PROMPT == 'Y' ]; then
  echo "DMG Path is $DMG_PATH";

  # check for dmgs
  FOUND=0;

  echo -n "Looking for JDK... ";
  if [ -e "$JDK_DMG" -o -e "$JDK_ARCHIVE_PATH" ]; then
    echo "found.";
    FOUND=1;
  else
    echo "not found.";
  fi    

  echo -n "Looking for Documentation... ";
  if [ -e "$JDK_DMG" -o -e "$JDK_ARCHIVE_PATH" ]; then
    echo "found.";
    FOUND=1;
  else
    echo "not found.";
  fi

  if [ $FOUND -eq 0 ]; then
    echo;
    echo "No DMGs found"; 
    help;
  fi

  # bacjup jar launcher
  fakesudo;
  if [ ! -e "/System/Library/CoreServices/Jar Launcher 1.4.app" ]; then
    echo "Moving 1.4 \"Jar Launcher.app\" to \"Jar Launcher 1.4.app\".";
    mv "/System/Library/CoreServices/Jar Launcher.app" "/System/Library/CoreServices/Jar Launcher 1.4.app";
  fi

  # jdk
  echo "Working on JDK";
  fakesudo;
  if [ -e "$JDK_DMG" ]; then
    echo "Found, \"$JDK_DMG\"";
    unpackdmg "$JDK_DMG" "$JDK_MOUNT" "$JDK_ARCHIVE_PATH";
  fi

  # documentation
  echo "Working on DOC";
  fakesudo;
  if [ -e "$DOC_DMG" ]; then
    echo "Found, \"$DOC_DMG\"";
    unpackdmg "$DOC_DMG" "$DOC_MOUNT" "$DOC_ARCHIVE_PATH";
  fi
  
  # default JDK?  
  echo;
  read -p "Make 1.5 your default JDK?(y/N)> " PROMPT;
  
  if [ $PROMPT == 'y' -o $PROMPT == 'Y' ]; then
    fakesudo;
    echo "Changing symlinks...";
    cd /System/Library/Frameworks/JavaVM.framework/Versions/;
    sudo rm CurrentJDK;
    sudo ln -s 1.5.0 CurrentJDK;
    echo "done.";
    
    echo "Checking Java Version: ";
    java -version;
  fi
else
  echo "Installation halted by user.";
fi