#!/bin/bash
#--------------------------------------------------------------
PKG=repack-deb
VER=0.92
REL=20090303
#check for needed command existence 
for c in /bin/mktemp /usr/bin/dpkg-deb /usr/bin/awk /bin/sed  /usr/bin/fakeroot
do
  if [ ! -x $c ]; then
     exit 1
  fi
done

#--------------------------------------------------------------
#init destination directory
DEST=./
NOKEEP=1
OPTAPP=1

#--------------------------------------------------------------
# define helper functions
function display_version {
  echo >&2 "$PKG Version $VER Release $REL"
  echo >&2 "Copyright 2009, Hiroshi Miura <miurahr@acm.org>"
}

function display_usage {
  echo >&2 "usage: $0 [-d][-v][-t target directory] <debian packages..>"
  echo >&2 
  echo >&2 "  -t target: set a directory stored converted packages"
  echo >&2 "      if not set, default is current directory."
  echo >&2 "  -d: verbose messages"
  echo >&2 "  -n: disable specific process for some application."
  echo >&2 "      eg. VitualBox, Skype, etc."
  echo >&2 "  -k: keep working directory"
  echo >&2 "  -v: display version"
}
#---------------------------------------------------------------

#check and extract parameters
while getopts "dhknt:v" op; do
  case $op in
    \?) display_usage;
	exit 1;;
    d)  DEBUG=1;;
    t)  DEST="$OPTARG";;
    k)  unset NOKEEP;DEBUG=1;;
    n)  unset OPTAPP;;
    h)  display_version;
	echo 
	display_usage; 
	exit 1;;
    v)  display_version; 
	exit 1;;
  esac
done

shift $(( $OPTIND - 1 ))
if [ $# -lt 1 ]; then
 echo >&2 "no argument."
 display_usage
 exit 1
fi


#------------------------------------------------------------
# define main routine
#
function cdeb {
SRC=$1

#make work directory
WORKDIR=`mktemp -d /tmp/debrepack.XXXXXXXXXX` || exit 1
mkdir $WORKDIR/DEBIAN

#unpack debian package
if [ $DEBUG ]; then
  echo >&2 "extract package in working directory $WORKDIR"
fi
fakeroot dpkg-deb --extract $SRC $WORKDIR 
fakeroot dpkg-deb --control $SRC $WORKDIR/DEBIAN

#modify control file to fit architecture and get package name
mv $WORKDIR/DEBIAN/control $WORKDIR/DEBIAN/control.orig
sed -e 's/^Architecture: i386/Architecture: lpia/g' \
	$WORKDIR/DEBIAN/control.orig > $WORKDIR/DEBIAN/control
rm $WORKDIR/DEBIAN/control.orig

if [ $OPTAPP ]; then
  PKGNAME=`awk '/Package:/{pkg=$2};/Version:/{ver=$2};END{printf("%s",pkg);}' \
	 $WORKDIR/DEBIAN/control` 
  case $PKGNAME in
    virtualbox-2.1) 
        rm -rf $WORKDIR/lib/modules/2.6.24-23-386
	rm -rf $WORKDIR/lib/modules/2.6.24-23-generic
	rm -rf $WORKDIR/lib/modules/2.6.24-23-rt
	rm -rf $WORKDIR/lib/modules/2.6.24-23-server
	;; 
    skype) ;;
  esac
fi

#repackage it
fakeroot dpkg-deb --build $WORKDIR $DEST

#cleanup work directory
if [ $NOKEEP ]; then   
  rm -r $WORKDIR
fi

}
#------------------------------------------------------------
#main

for d in $*
do 
  if [ -f $d ]; then
    cdeb $d
  fi
done
exit 0