#!/bin/bash

if test -z "$BASH"; then

  cmd="$0"

  if test "`basename $0`" = "$0"; then

    cmd="./$0"

  fi

  echo "This script is designed to be run using GNU bash."

  echo "Try: chmod +x $0 && $cmd"

  exit 1

fi

# OS X sed (at least leopard and up) seem to support -E

sedflags=Ee

if ( sed --version 2>&1 | grep 'GNU sed' 2>&1 ) > /dev/null ; then

	sedflags=re

fi

my_which_real()

{

  test -n "$1" || return 1

  local i

  local part

  for (( i=1; ; i++ )); do

    part=`echo "$PATH" | cut -d ':' -f $i`

    test -n "$part" || return 1

    if test -x "$part/$1"; then

      echo "$part/$1"

      return 0

    fi

  done

}

my_which()

{

  local out

  local r

  out=`my_which_real "$1"`

  r=$?

  if [ -z "$out" -o $r = 1 ]; then

    echo "ERROR: $1 command not found on system" 1>&2

    exit 1

  fi

  echo $out

  return $r

}

# Show the extraction progress spinner.

# Spins the propeller one time for each line on stdin

progressbit()

{

  local i

  local pbar

  local line

  i=0

  pbar="-\\|/"

  while read line; do

    ((i++))

    j=$(($i % ${#pbar}))

    echo -ne "\r${pbar:$j:1} Extracting..."

  done

}

# Create a temp directory. Very bad in terms of randomness source, but hey, I'm a security major. Can't help it.

mktempdir()

{

  local tempdir

  tempdir=/tmp/ext`$dd if=/dev/urandom bs=128 count=1 2>/dev/null | $md5sum - | cut -c 1-6`

  echo $tempdir

  return 0

}

# Outputs the raw compressed tarball data on stdout.

getdata()

{

  offset=`$cat $0 | $grep -an '^##DATA' | cut -d ':' -f 1 || exit 1`

  offset=$((offset + 1))

  $cat $0 | $tail -n+$offset

}

# Go through each required command, and make sure it's on the system. If not, fail.

for cmd in bzip2 tar grep tail cat wc dd; do

  my_which $cmd>/dev/null || exit 1

  eval $cmd=`my_which $cmd`

  if test x$? = x1; then

    exit 1

  fi

done

# special case for md5sum

if my_which_real md5sum 2>&1 > /dev/null; then

	md5sum=`my_which_real md5sum`

elif my_which_real openssl 2>&1 > /dev/null; then

	md5sum=md5sum

	md5sum()

	{

		local f=${1:--}

		cat $f | openssl dgst -md5 | sed -$sedflags 's/^\(stdin\)= //'

	}

else

	echo "Could not find md5sum or openssl"

	exit 1

fi

tempdir=""

extractonly=0

while test -n "$1"; do

  case "$1" in

    -x)

      extractonly=1

      if test -n "$2"; then

        tempdir=$2

      else

        tempdir=`echo $0 | sed -$sedflags 's/\.[a-z0-9_-]{1,5}$//'`

      fi

      ;;

  esac

  shift

done

# Make sure we have a working temp directory

test -n "$tempdir" || tempdir=`mktempdir`

if [ -d "$tempdir" ]; then

  if [ $extractonly = 1 ]; then

    i=0

    basetemp="$tempdir"

    while test -d "$tempdir"; do

      tempdir="${basetemp}${i}"

      ((i++))

    done

  else

    while test -d "$tempdir"; do

      tempdir=`mktempdir`

    done

  fi

fi

mkdir "$tempdir" || exit 1

# Finally, extract the data.

echo -ne "\e[?25l- Extracting..."

getdata | $bzip2 -dc | $tar xvCf $tempdir - | progressbit \

  || (

      rm -rf $tempdir

      echo -ne "\e[?25h"

      exit 1

     )

# clear out the extraction progress

echo -ne "\r\e[?25h"

# trap exits so we can clean up if the script is interrupted

handle_interrupt()

{

  rm -rf $tempdir

  # added in rev. 2, interrupts should cause an error exit

  exit 1

}

trap handle_interrupt 0

if test -x $tempdir/autorun.sh && test $extractonly != 1; then

  # Run the autorun script

  $tempdir/autorun.sh

  ret=$?

  rm -rf $tempdir

  exit $ret

else

  # Just let the user know where the files are and die.

  echo "Contents extracted to $tempdir."

fi

# free our trap on signals

trap "exit 0;" 0

# done!

exit 0

# don't touch this marker! Everything after this is expected to be binary data.

##DATA