pkgextract/pkgextract.sh

   1 #!/bin/sh
   2 extract_rpm ()
   3 {
   4         RPM=$1
   5         leadsize=96
   6         o=`expr $leadsize + 8`
   7         set `od -j $o -N 8 -t u1 $pkg`
   8         il=`expr 256 \* \( 256 \* \( 256 \* $2 + $3 \) + $4 \) + $5`
   9         dl=`expr 256 \* \( 256 \* \( 256 \* $6 + $7 \) + $8 \) + $9`
  10
  11         sigsize=`expr 8 + 16 \* $il + $dl`
  12         o=`expr $o + $sigsize + \( 8 - \( $sigsize \% 8 \) \) \% 8 + 8`
  13         set `od -j $o -N 8 -t u1 $pkg`
  14         il=`expr 256 \* \( 256 \* \( 256 \* $2 + $3 \) + $4 \) + $5`
  15         dl=`expr 256 \* \( 256 \* \( 256 \* $6 + $7 \) + $8 \) + $9`
  16         hdrsize=`expr 8 + 16 \* $il + $dl`
  17         o=`expr $o + $hdrsize`
  18         dd if=$pkg ibs=$o skip=1 2>/dev/null | bsdtar -xf -
  19 }
  20 extract_deb ()
  21 {
  22         DEB=$1
  23         bsdtar -xf ${DEB} data.tar.gz
  24         bsdtar -xf data.tar.gz
  25         rm data.tar.gz
  26 }
  27 pkg=$1
  28 if [ "$pkg" = "" -o ! -e "$pkg" ]; then
  29         echo "no package supplied" 1>&2
  30         exit 1
  31 fi
  32 ext=`echo $pkg | awk -F. '{ print $NF }'`
  33 case "$ext" in
  34         rpm|RPM)
  35                 extract_rpm $pkg
  36                 ;;
  37         deb|DEB)
  38                 extract_deb $pkg
  39                 ;;
  40         *)
  41                 echo "Unknown package type: $pkg"
  42                 exit 1
  43         esac