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#!/bin/sh

# ipkg-build -- construct a .ipk from a directory
# Carl Worth <cworth@east.isi.edu>
# based on a script by Steve Redler IV, steve@sr-tech.com 5-21-2001
set -e

ipkg_extract_value() {
        sed -e "s/^[^:]*:[[:space:]]*//"
}

required_field() {
        field=$1

        value=`grep "^$field:" < $CONTROL/control | ipkg_extract_value`
        if [ -z "$value" ]; then
                echo "ipkg-build: Error: $CONTROL/control is missing field $field" ;
                PKG_ERROR=1
        fi
        echo $value
}

pkg_appears_sane() {
        local pkg_dir=$1

        local owd=`pwd`
        cd $pkg_dir

        PKG_ERROR=0
        if [ ! -f "$CONTROL/control" ]; then
                echo "ipkg-build: Error: Control file $pkg_dir/$CONTROL/control not found."
                cd $owd
                return 1
        fi

        pkg=`required_field Package`
        version=`required_field Version | sed 's/.*://;'`
        arch=`required_field Architecture`
        required_field Maintainer >/dev/null
        required_field Description >/dev/null

        if echo $pkg | grep '[^a-z0-9.+-]'; then
                echo "ipkg-build: Error: Package name $name contains illegal characters, (other than [a-z0-9.+-])"
                PKG_ERROR=1;
        fi

        local bad_fields=`sed -ne 's/^\([^[:space:]][^:[:space:]]\+[[:space:]]\+\)[^:].*/\1/p' < $CONTROL/control | sed -e 's/\\n//'`
        if [ -n "$bad_fields" ]; then
                bad_fields=`echo $bad_fields`
                echo "ipkg-build: Error: The following fields in $CONTROL/control are missing a ':'"
                echo "  $bad_fields"
                echo "ipkg-build: This may be due to a missing initial space for a multi-line field value"
                PKG_ERROR=1
        fi

        for script in $CONTROL/preinst $CONTROL/postinst $CONTROL/prerm $CONTROL/postrm; do
                if [ -f $script -a ! -x $script ]; then
                        echo "ipkg-build: Error: package script $script is not executable"
                        PKG_ERROR=1
                fi
        done

        if [ -f $CONTROL/conffiles ]; then
                for cf in `cat $CONTROL/conffiles`; do
                        if [ ! -f ./$cf ]; then
                                echo "ipkg-build: Error: $CONTROL/conffiles mentions conffile $cf which does not exist"
                                PKG_ERROR=1
                        fi
                done
        fi

        cd $owd
        return $PKG_ERROR
}

###
# ipkg-build "main"
###

case $# in
1)
        dest_dir=.
        ;;
2)
        dest_dir=$2
        ;;
*)
        echo "Usage: ipkg-build <pkg_directory> [<destination_directory>]" ;
        exit 1
        ;;
esac

pkg_dir=$1

if [ ! -d $pkg_dir ]; then
        echo "ipkg-build: Error: Directory $pkg_dir does not exist"
        exit 1
fi

# CONTROL is second so that it takes precedence
CONTROL=
[ -d $pkg_dir/DEBIAN ] && CONTROL=DEBIAN
[ -d $pkg_dir/CONTROL ] && CONTROL=CONTROL
if [ -z "$CONTROL" ]; then
        echo "ipkg-build: Error: Directory $pkg_dir has no CONTROL subdirectory."
        exit 1
fi

if ! pkg_appears_sane $pkg_dir; then
        echo "Please fix the above errors and try again."
        exit 1
fi

tmp_dir=$dest_dir/IPKG_BUILD.$$
mkdir $tmp_dir

#tar -C $pkg_dir -czf $tmp_dir/data.tar.gz . --exclude=$pkg_dir/CONTROL
#
# gutemine's fix for --exclude bug
#
FILESWITHOUTCONTROL=`cd $pkg_dir; ls -1 | grep -v CONTROL`
#echo $FILESWITHOUTCONTROL

tar -C $pkg_dir -czf $tmp_dir/data.tar.gz $FILESWITHOUTCONTROL
tar -C $pkg_dir/$CONTROL -czf $tmp_dir/control.tar.gz .

echo "2.0" > $tmp_dir/debian-binary

pkg_file=$dest_dir/${pkg}_${version}_${arch}.ipk
if [ -f /usr/bin/enigma2 ]; then
   if [ ! -f /usr/local/bin/ar ]; then
      BUSYBOX=`ls -F /usr/bin/ar | grep @ | wc -l`
      if [ $BUSYBOX -eq 1 ]; then
         echo ar seems to be from busybox - not capable to create archive
         echo Install ar from binutils at /usr/local/bin
         echo or replace link from /usr/bin/ar to busybox with real ar binary
         exit 0
      fi
   fi
fi
cd $tmp_dir
ar -r $pkg_file ./debian-binary ./data.tar.gz ./control.tar.gz
mv $pkg_file ..
cd ..
rm -r -f $tmp_dir

echo "Packaged content was moved at $pkg_dir into $pkg_file"