#!/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
# modified by Junya Keller <zaurus@h2o.ch> on 2003/01/03
# tested on zaurus with sharp rom 2.38G / oz3.0
# - supports building packages from vfat-drives (use control instead of CONTROL)
# - in package name A-Z are now allowed
# - added option -v: verbosely list files in archive
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 "*** Error: $CONTROL/control is missing field $field" >&2
		return 1
	fi
	echo $value
	return 0
}

pkg_appears_sane() {
	local pkg_dir=$1

	cd $pkg_dir

	PKG_ERROR=0

#	large_uid_files=`find . -uid +99`
#	if [ -n "$large_uid_files" ]; then
#		echo "*** Warning: The following files have a UID greater than 99. You probably want to chown these to a system user: " >&2
#		ls -ld $large_uid_files
#		echo >&2
#	fi
	    
	if [ ! -f "$CONTROL/control" ]; then
		echo "*** Error: Control file $pkg_dir/$CONTROL/control not found." >&2
		cd $owd
		return 1
	fi

	pkg=`required_field Package`
	[ "$?" -ne 0 ] && PKG_ERROR=1

	version=`required_field Version | sed 's/.*://;'`
	[ "$?" -ne 0 ] && PKG_ERROR=1

	arch=`required_field Architecture`
	[ "$?" -ne 0 ] && PKG_ERROR=1

	required_field Maintainer >/dev/null
	[ "$?" -ne 0 ] && PKG_ERROR=1

	required_field Description >/dev/null
	[ "$?" -ne 0 ] && PKG_ERROR=1

	section=`required_field Section`
	[ "$?" -ne 0 ] && PKG_ERROR=1
	if [ -z "$section" ]; then
	    echo "The Section field should have one of the following values:" >&2
	    echo "admin, base, comm, editors, extras, games, graphics, kernel, libs, misc, net, text, web, x11" >&2
	fi

	priority=`required_field Priority`
	[ "$?" -ne 0 ] && PKG_ERROR=1
	if [ -z "$priority" ]; then
	    echo "The Priority field should have one of the following values:" >&2
	    echo "required, important, standard, optional, extra." >&2
	    echo "If you don't know which priority value you should be using, then use \`optional'" >&2
	fi

	if echo $pkg | grep '[^A-Za-z0-9.+-]'; then
		echo "*** Error: Package name $name contains illegal characters, (other than [A-Za-z0-9.+-])" >&2
		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 "*** Error: The following fields in $CONTROL/control are missing a ':'" >&2
		echo "	$bad_fields" >&2
		echo "ipkg-build: This may be due to a missing initial space for a multi-line field value" >&2
		PKG_ERROR=1
	fi

	for script in $CONTROL/preinst $CONTROL/postinst $CONTROL/prerm $CONTROL/postrm; do
		if [ -f $script -a ! -x $script ]; then
			echo "*** Error: package script $script is not executable" >&2
			PKG_ERROR=1
		fi
	done

	if [ -f $CONTROL/conffiles ]; then
		for cf in `cat $CONTROL/conffiles`; do
			if [ ! -f ./$cf ]; then
				echo "*** Error: $CONTROL/conffiles mentions conffile $cf which does not exist" >&2
				PKG_ERROR=1
			fi
		done
	fi

	cd $owd
	return $PKG_ERROR
}

ipkg-build-usage() {
	[ $# -gt 0 ] && echo "ipkg-build: $*"
	echo "
usage: ipkg-build [-v] <pkg_directory> [<destination_directory>]
options:
	-v	verbosely list files in archive
" >&2
	exit 1
}


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

# Parse options
verbose_comp=
while [ $# -gt 0 ]; do
	arg="$1"
	case $arg in
	-v)
		verbose_comp=-v
		;;
	-*)
		ipkg-build-usage "Unknown option $arg"
		;;
	*)
		break
		;;
	esac
	shift
done

case $# in
1)
	dest_dir=.
	;;
2)
	dest_dir=$2
	;;
*)
	ipkg-build-usage "Too many arguments"
	;;
esac
pkg_dir=$1

if [ ! -d $pkg_dir ]; then
	ipkg-build-usage "Package directory \"$pkg_dir\" does not exist"
fi
if [ ! -d $dest_dir ]; then
	ipkg-build-usage "Destination directory \"$dest_dir\" does not exist"
fi

owd=`pwd`
cd $pkg_dir
pkg_dir=`pwd`
cd $owd
cd $dest_dir
dest_dir=`pwd`

# CONTROL is third so that it takes precedence
CONTROL=
[ -d $pkg_dir/DEBIAN ] && CONTROL=DEBIAN
[ -d $pkg_dir/control ] && CONTROL=control
[ -d $pkg_dir/CONTROL ] && CONTROL=CONTROL
if [ -z "$CONTROL" ]; then
	echo "*** Error: Directory $pkg_dir has no CONTROL subdirectory." >&2
	exit 1
fi

if ! pkg_appears_sane $pkg_dir; then
	echo >&2
	echo "*** Error: Please fix the above errors and try again." >&2
	exit 1
fi

if [ -f "$pkg_dir/debian-binary" ]; then
	if [ "`cat $pkg_dir/debian-binary`" != "2.0" ]; then
		echo "*** Warning: File $pkg_dir/debian-binary ignored."
	fi
fi

tmp_dir=/tmp/IPKG_BUILD.$$
mkdir $tmp_dir

[ -n "$verbose_comp" ]&&echo "Contents of data.tar.gz:"
cd $pkg_dir
tar_files=`ls -1A|grep -v "^$CONTROL\$"|grep -v "^debian-binary\$"|sed -e "s/^/.\//"`
tar $verbose_comp -c $tar_files|gzip >$tmp_dir/data.tar.gz
[ -n "$verbose_comp" ]&&echo "
Contents of control.tar.gz:"
cd $pkg_dir/$CONTROL
tar $verbose_comp -c .|gzip >$tmp_dir/control.tar.gz

echo "2.0" > $tmp_dir/debian-binary

pkg_file=$dest_dir/${pkg}_${version}_${arch}.ipk
[ -n "$verbose_comp" ]&&echo "
Contents of $pkg_file:"
cd $tmp_dir
tar $verbose_comp -c ./debian-binary ./data.tar.gz ./control.tar.gz|gzip >$pkg_file
[ -n "$verbose_comp" ]&&echo

rm -R $tmp_dir
echo "Packaged contents of $pkg_dir into $pkg_file"