#!/bin/sh

# opkg-build -- construct a .opk from a directory
# Carl Worth <cworth@east.isi.edu>
# based on a script by Steve Redler IV, steve@sr-tech.com 5-21-2001
# 2003-04-25 rea@sr.unh.edu
#   Updated to work on Familiar Pre0.7rc1, with busybox tar.
#   Note it Requires: binutils-ar (since the busybox ar can't create)
set -e

version=1.0

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

required_field() {
	field=$1

	value=`grep "^$field:" < $CONTROL/control | opkg_extract_value`
	if [ -z "$value" ]; then
		echo "*** Error: $CONTROL/control is missing field $field" >&2
		return 1
	fi
	echo $value
	return 0
}

disallowed_field() {
	field=$1

	value=`grep "^$field:" < $CONTROL/control | opkg_extract_value`
	if [ -n "$value" ]; then
		echo "*** Error: $CONTROL/control contains disallowed field $field" >&2
		return 1
	fi
	echo $value
	return 0
}

pkg_appears_sane() {
	local pkg_dir=$1

	local owd=`pwd`
	cd $pkg_dir

	PKG_ERROR=0

	tilde_files=`find . -name '*~' -ls -printf '\\\n'`
	if [ -n "$tilde_files" ]; then
	    if [ "$noclean" = "1" ]; then
		echo "*** Warning: The following files have names ending in '~'.
You probably want to remove them: " >&2
		echo -e $tilde_files
		if [ $? -ne 0 ]; then
			echo "*** Error: Fail to list files have names ending in '~'."
			exit 1
		fi
		echo >&2
	    else
		echo "*** Removing the following files: $tilde_files"
		rm -f "$tilde_files"
	    fi
	fi

	large_uid_files=`find . -uid +99 -ls -printf '\\\n' || true`

	if [ "$ogargs" = "" ]  && [ -n "$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
		echo -e $large_uid_files
		if [ $? -ne 0 ]; then
			echo "*** Error: Fail to list files have a UID greater than 99."
			exit 1
		fi
		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`
	[ "$?" -ne 0 ] && PKG_ERROR=1
	version=`echo $version | sed 's/Version://; s/^.://g;'`

	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

	source=`required_field Source`
	[ "$?" -ne 0 ] && PKG_ERROR=1
	if [ -z "$source" ]; then
	    echo "The Source field contain the URL's or filenames of the source code and any patches" 
	    echo "used to build this package.  Either gnu-style tarballs or Debian source packages "
	    echo "are acceptable.  Relative filenames may be used if they are distributed in the same"
	    echo "directory as the .opk file."
	fi

	disallowed_filename=`disallowed_field Filename`
	[ "$?" -ne 0 ] && PKG_ERROR=1

	if echo $pkg | grep '[^a-z0-9.+-]'; then
		echo "*** Error: Package name $name contains illegal characters, (other than [a-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 "opkg-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
}

###
# opkg-build "main"
###
ogargs=""
outer=ar
noclean=0
opkext=0

# Determine if tar supports the --format argument by checking the help output.
#
# This is needed because:
#    - Busybox tar doesn't support '--format'
#    - On some Linux distros, tar now defaults to posix format if '--format'
#      isn't explicitly specified
#    - Opkg doesn't currently support posix format archives
#
# It's easier to check for mention of the '--format' option than to detect the
# tar implementation and maintain a list of which support '--format'.
tarformat=""
if tar --help 2>&1 | grep -- "--format" > /dev/null;
then
    tarformat="--format=gnu"
fi

usage="Usage: $0 [-c] [-C] [-O] [-o owner] [-g group] <pkg_directory> [<destination_directory>]"
while getopts "cCg:ho:vO" opt; do
    case $opt in
	o ) owner=$OPTARG
	    ogargs="--owner=$owner"
	    ;;
	O ) opkext=1
	    ;;
	g ) group=$OPTARG
	    ogargs="$ogargs --group=$group"
	    ;;
        c ) outer=tar
            ;;
        C ) noclean=1
            ;;
	v ) echo $version
	    exit 0
	    ;;
	h ) 	
	    echo $usage  >&2 
	    exit 0
	    ;;
	\? ) 	
	    echo $usage  >&2
	esac
done


shift $(($OPTIND - 1))

# continue on to process additional arguments

case $# in
1)
	dest_dir=$PWD
	;;
2)
	dest_dir=$2
	if [ "$dest_dir" = "." -o "$dest_dir" = "./" ] ; then
	    dest_dir=$PWD
	fi
	;;
*)
	echo $usage >&2
	exit 1 
	;;
esac

pkg_dir=$1

if [ ! -d $pkg_dir ]; then
	echo "*** Error: Directory $pkg_dir does not exist" >&2
	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 "*** Error: Directory $pkg_dir has no CONTROL subdirectory." >&2
	exit 1
fi

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

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

echo $CONTROL > $tmp_dir/tarX
( cd $pkg_dir && tar $ogargs -X $tmp_dir/tarX -cz $tarformat -f $tmp_dir/data.tar.gz . )
( cd $pkg_dir/$CONTROL && tar $ogargs -cz $tarformat -f $tmp_dir/control.tar.gz . )
rm $tmp_dir/tarX

echo "2.0" > $tmp_dir/debian-binary

if [ $opkext -eq 1 ]; then 
	pkg_file=$dest_dir/${pkg}_${version}_${arch}.opk
else
	pkg_file=$dest_dir/${pkg}_${version}_${arch}.ipk
fi

rm -f $pkg_file
if [ "$outer" = "ar" ] ; then
  ( cd $tmp_dir && ar -crf $pkg_file ./debian-binary ./control.tar.gz ./data.tar.gz )
else
  ( cd $tmp_dir && tar -cz $tarformat -f $pkg_file ./debian-binary ./control.tar.gz ./data.tar.gz )
fi

rm $tmp_dir/debian-binary $tmp_dir/data.tar.gz $tmp_dir/control.tar.gz
rmdir $tmp_dir

echo "Packaged contents of $pkg_dir into $pkg_file"
