#!/bin/sh
# PLD RescueCD modifier 0.2
# (c) areq@pld-linux.org

ISOSIZE=60143616
VERSION=PLD_RCD_2_01

usage ()
{
echo Usage:
echo isomod -i isofile [-o isofile.out] [-f custom_files] [-d unpack_dir] [-tail\|-dd]
echo 
echo "Example:"
echo "  isomod -i rescue.iso -f pld000.tar.bz2,pld100.tar.bz2 -o rescue_new.iso"
echo "   Add pld000.tar.bz2 pld100.tar.bz2 to rescue.iso and save as rescue_new.iso."
echo 
echo "  isomod -i rescue.iso -d katalog"
echo "   Save all files from rescue.iso to direcory katalog."
echo
echo "  isomod -i rescue.iso -d katalog -dd"
echo "   Save all files from rescue.iso to direcory katalog use dd - slow."
echo
echo "  isomod -d katalog -o rescue_new.iso"
echo "   Create rescue_new.iso from directory katalog."
echo
exit 1
}

un_tail ()
{
 tail -c $(($ISOSIZE-$2)) $ISO | head -c $3 > $1
}
un_dd ()
{
 dd if=$ISO of=$1 skip=$2 count=$3 bs=1 2> /dev/null
}

unpack ()
{
 mkdir -p $(dirname $1)
 un_$METHOD $*
 echo "$4  $1" | md5sum -c
}
mkiso ()
{
LOG=`mktemp /tmp/isomod.$$.XXXXXX` || exit 1
echo Save log to $LOG.

mkisofs -v -J -R -D -A "$VERSION" -m "CVS" -V "$VERSION" -no-emul-boot -boot-info-table \
-boot-load-size 4 -b boot/isolinux/isolinux.bin -c boot/isolinux/boot.catalog \
-log-file $LOG  -o "$2" $1

echo Saved $2.
}

unpack_all ()
{
while read file start len md5; 
do 
 unpack $DIR/$file $start $len $md5
done << __EOT__
boot/ElTorito.img.gz       57847808    17131 f49c4f2db855d2d482d399caacd2d3c3
boot/README                57872384      744 872b6e50b511b7a96c56047ef3ea851b
boot/boot.bat              57845760       83 5a6fc33959be2620bb28c189c916123d
boot/floppy.img.gz         57866240     1475 0de1d2855264fda93edc1b2a7a175c5c
boot/isolinux/boot.msg     57874432     1628 ab5297cb5b8254d8093f35b6a81d9af0
boot/isolinux/help.msg     58056704     1443 c7848be610b96a31aa671007c4d72de5
boot/isolinux/isolinux.bin    79872    10932 f26afe683f536680641aa1db0883b23a
boot/isolinux/isolinux.cfg 58441728     1185 5da5599858cc76158f468202d85f252c
boot/isolinux/memtest      58464256   103384 d7151cd5c2445d716d8a774c2b686f0c
boot/isolinux/grub.exe     57876480   178592 06236d934b801f8f834cf8a1484dd255
boot/isolinux/memdisk      58443776    20056 34194dd1e6d50cf7015b85f432758361
boot/isolinux/vmlinuz      58568704  1265664 2888b34c7be47c4718569a73f187460d
boot/isolinux/initrd.ide   58058752   381122 75369faa33dc54bbfadbd6db5c808ae1
custom/custom.cpi          59834368     1024 004ca74e4c525ceeee6d3d4b2abe4ffa
rescue.cpi                    92160 57752064 bd0aabec1d44269bb9c7217f7c731241
__EOT__
}

echo PLD RescueCD modifier 0.2
echo

[ $# -eq 0 ] && usage

METHOD=tail
RMOUT=0
while [ $# -ge 1 ]; do
  case $1 in
    -i)     shift;  ISO=$1 ;;
    -o)     shift;  OUT=$1 ;;
    -d)     shift;  DIR=$1 ;;
    -f)     shift;  FILE=$1 ;;
    -dd)    METHOD=dd;;
    -tail)  METHOD=tail ;;
    *)     usage ;;
  esac
  shift
done

if [ "$DIR" = "" ] 
then
 DIR=`mktemp -d /tmp/$$.XXXXXX` || exit 1
 RMOUT=1
fi

if [ "$FILE" != "" ] 
then
 FILE=`echo $FILE | tr ',' ' '`
 for F in $FILE
 do
   echo Checking $F...
   [ -f "$F" ] || exit 1
   [ "$(head -c 3 "$F")" = "BZh" ] || exit 1
   bzip2 -dc "$F" | tar tf - | sed 's/\.\///' |\
 	grep -v -q -E "^$|^etc|^tmp|^var|^root|^home|^opt|^srv"
   if [ $? == 0 ]; then
      echo -e "PANIC! $ contains invalid paths! quitting.\n"
      exit 1
   fi 
   echo OK
 done
fi

if [ -n "$ISO" ]
then
  if ! [ -f "$ISO" ] 
  then
    echo File $ISO not found!
  exit 1
  fi
  if ! [ $(stat -c %s $ISO) -eq $ISOSIZE ]
  then
    echo Bad iso file $ISO!
  exit 1
  fi
  unpack_all
fi

if [ -n "$FILE" ] ; then
  TT=`mktemp -d /tmp/$$.XXXXXX` || exit 1
  DIR=$(cd $DIR;pwd)
  C=`pwd`
  cp $FILE $TT/
  cd $TT
  ls | cpio  -H newc -o > $DIR/custom/custom.cpio
  echo Add $FILE.
  cd $C
  rm -fr $TT
fi

[ -n "$OUT" ] && mkiso $DIR $OUT 

[ $RMOUT -eq 1 ] && rm -fr $DIR