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

ISOSIZE=52387840
VERSION=PLDRCD_2_94

TRAILER1="07070100000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000B00000000TRAILER!!!"
TRAILER2="\0\0\0\0"

usage ()
{
echo Usage:
echo rcdmod -i isofile [-o isofile.out] [-f custom_files] [-d unpack_dir] [-tail\|-dd]
echo rcdmod -r rescue.cpi [-o rescue.cpi.out] [-f custom_files]
echo 
echo "Example:"
echo "  rcdmod -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 "  rcdmod -i rescue.iso -d katalog"
echo "   Save all files from rescue.iso to direcory katalog."
echo
echo "  rcdmod -i rescue.iso -d katalog -dd"
echo "   Save all files from rescue.iso to direcory katalog use dd - slow."
echo
echo "  rcdmod -d katalog -o rescue_new.iso"
echo "   Create rescue_new.iso from directory katalog."
echo
echo "  rcdmod -r rescue.cpi -o rescue.cpi.new"
echo "   Create new rescue.cpi.new with."
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/rcdmod.$$.XXXXXX` || exit 1
echo Save log to $LOG.

mkisofs -v -J -R -D -A "$VERSION" -m "CVS" -m ".cvsignore" -V "$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       49715200    17131 f49c4f2db855d2d482d399caacd2d3c3
boot/README                49741824      819 f7ffe1669c42088bb25d9f11bcd6c06c
boot/boot.bat              49713152       83 5a6fc33959be2620bb28c189c916123d
boot/floppy.img.gz         49733632     1475 0de1d2855264fda93edc1b2a7a175c5c
boot/sgd09590.gz           49743872   352768 dbaa071a1e75af3f54160a296e5db50c
boot/isolinux/boot.msg.bot 50100224     1673 dbace6436f4d5eee1747372741399882
boot/isolinux/boot.msg.x86 50102272     1623 9db4aa91af7f3f46e94a9d216ab104e8
boot/isolinux/boot.msg.x86 50098176     1587 4804fc9f5d6020c8b254df548b6c01f0
boot/isolinux/grub.exe     50106368   202405 a0173b31ef1e4659430225b0e85d3112
boot/isolinux/help.msg     50309120     1443 c7848be610b96a31aa671007c4d72de5
boot/isolinux/isolinux.bin    81920    12331 50da89503e76cef9bfba6cf09bbce158
boot/isolinux/memdisk      50317312    20068 8245100dff1879493f5d99e124b1e0de
boot/isolinux/memtest      50337792   103384 d7151cd5c2445d716d8a774c2b686f0c
boot/isolinux/boot.msg     50098176     1587 4804fc9f5d6020c8b254df548b6c01f0
boot/isolinux/isolinux.cfg 50313216     1685 3432cf77852ee3b7f8e9cc1aa92d508a
boot/isolinux/isolinux.cfg 50311168     1685 9a6289dd5b3b083a54336bb1662e5dc3
boot/isolinux/isolinux.cfg 50311168     1685 9a6289dd5b3b083a54336bb1662e5dc3
boot/isolinux/vmlinuz6     50442240  1635328 503b9a0f7294be627f0e6f7c7bbbfede
custom/custom.cpi          52078592     1024 3b70de24727aa4f54c9b94efe282ce8c
rescue6.cpi                   96256 49616574 1f8bb37010438739f054817674ffdf35
__EOT__
}

panic ()
{
    echo -e "PANIC! $1! quitting.\n"
    exit 1
}

cpio_mod ()
{
 [ "$(head -c 6 "$CPIO")" = "070701" ] || panic "Unexpected file format $CPIO "
 sed "/$TRAILER1.*/d" $CPIO > $OUT
 echo -n "$TRAILER1$TRAILER2" >> $OUT	 
 
 if [ -f $DIR/custom/custom.cpi ]; then
   cat $DIR/custom/custom.cpi >> $OUT
 fi
 echo "$OUT created."
}

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 ;;
    -r)     shift;  CPIO=$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"
   [ $? == 0 ] && panic "PANIC! $F contains invalid paths! quitting.\n"
   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)
  mkdir -p $DIR/custom
  C=`pwd`
  cp $FILE $TT/
  cd $TT
  ls | cpio  -H newc -o > $DIR/custom/custom.cpi
  echo Add $FILE.
  cd $C
  rm -fr $TT
fi

[ -n "$OUT" -a -z "$CPIO" ] && mkiso $DIR $OUT
[ -n "$OUT" -a -n "$CPIO" ] && cpio_mod

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