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

ISOSIZE=64708608
VERSION=PLDRCD_2_92

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       61947904    17131 f49c4f2db855d2d482d399caacd2d3c3
boot/README                61974528      819 f7ffe1669c42088bb25d9f11bcd6c06c
boot/boot.bat              61945856       83 5a6fc33959be2620bb28c189c916123d
boot/floppy.img.gz         61966336     1475 0de1d2855264fda93edc1b2a7a175c5c
boot/isolinux/grub.exe     62339072   202405 a0173b31ef1e4659430225b0e85d3112
boot/isolinux/help.msg     62541824     1443 c7848be610b96a31aa671007c4d72de5
boot/isolinux/isolinux.bin    79872    11603 d92d8794c82716de99c33ab26efb842d
boot/isolinux/memdisk      62910464    20056 c898edab36f825e2548ba4c0d2d798bc
boot/isolinux/memtest      62930944   103384 d7151cd5c2445d716d8a774c2b686f0c
boot/isolinux/isolinux.cfg 62908416     1699 580b2e18eb6653f0db3a82fbe5a9910c
boot/isolinux/vmlinuz      63035392  1362432 ce17e63f935495f47353570b247f6d51
boot/isolinux/initrd.ide   62543872   363050 e47382e04c72048299ebf1976fc9adbc
boot/isolinux/boot.msg.bot 62332928     1673 d8edebf8a43bea07a03d39e0822ac043
boot/isolinux/boot.msg.x86 62330880     1623 a248701e8ca47473fcc271cc6c9da3af
boot/isolinux/boot.msg.x86 62337024     1587 1b501f1c51ad5349e431f55492b27d24
boot/isolinux/boot.msg     62330880     1623 a248701e8ca47473fcc271cc6c9da3af
boot/sgd09590.gz           61976576   352768 dbaa071a1e75af3f54160a296e5db50c
custom/custom.cpi          64399360     1024 31b52bcfb4eeed1a20048a312cecbdb7
rescue.cpi                    92160 61852672 c4d2b6a50596da606b96c11f6998afcf
__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