#!/bin/sh
#
# <zaurus@bredband.net>
# Modified by Aman Gupta <oz@themastermind1.net>
# Modified by Matthias Hentges to adjust to changes in OZ <oe@hentges.net>
# Modified by Tom Yates <reply@teaparty.net> to work with opkg

usage () {
	echo "Usage: "
	echo "    $0 add    packagename (links \"packagename\" to root filesystem)"
	echo "    $0 remove packagename (unlinks \"packagename\" from root filesystem)"
	echo "    $0 list   mountpoint  (lists packages on \"mountpoint\", e.g. '/mnt/card')"
	echo "    $0 mount  mountpoint  (links all packages on \"mountpoint\", e.g. '/mnt/card')"
	echo "    $0 umount mountpoint  (unlinks all packages on \"mountpoint\", e.g. '/mnt/card')"
	exit
}

findpackage () {
	echo "*** Locating package"
		
	if test -e /etc/opkg.conf
	then
		valid_mount_points=`cat /etc/opkg.conf| grep ^dest| awk '{print $3}'|sed "s/\/$//"`
	else
		valid_mount_points="/mnt/card /mnt/cf /mnt/ram /media/card /media/cf /media/ram"
	fi
	
	for mount_point in $valid_mount_points
	do
		if [ -e "$mount_point/usr/lib/opkg/info/$PACKAGE.list" ]; then
			PREFIX="$mount_point"
			files=`cat "$PREFIX/usr/lib/opkg/info/$PACKAGE.list" |sed -e "s#$mount_point##g"`
		fi
	done
	
	
	if test -z "$files"
	then
		echo "Package \"$PACKAGE\" not found."
		exit
	else	
		echo "*** Found package on $PREFIX"
	fi
}

add () {
	echo "*** Adding $PACKAGE"
	echo "$files" |
	while read line; do
		test -L "$line" && rm "$line"
		if [ ! -e "$line" ]; then
			# Only if it doesn't already exist.
			if [ -d "$PREFIX$line" ]; then
				# It's a directory.
				`mkdir "$line"`
			else
				# It's a file.
				[ ! -d `dirname $line` ] && mkdir -p `dirname $line`
				`ln -s "$PREFIX$line" "$line"`
			fi
		fi
		
		# The next function checks whether the _source_ file (ie: /media/card/something)
		# does actually exist. If it doesn't, it could by a library symlink (ie: libsomething.0.1 -> libsomething.0)
		# Since VFAT & friends do not support symlinks, these library links would not exist after installation
		# and trying to symlink them into the rootfs with opkg-link results in unconnected symlinks in the rootfs.
		# So we use the real lib file in /media/card/whatever and create all needed symlinks in the rootfs
		# using the real file as source.
                               
		if [ ! -e "$PREFIX$line" ]; then
			if ( echo "$line" | grep -q "lib" ) ; then
				libsearchfile=$(echo $line | sed -e "s#[a-z0-9/.]*/##g")
				libfoundfiles=$(find $PREFIX -name "$libsearchfile*")
                      
				for liblinkfile in $libfoundfiles; do
					echo "Linking $line to $liblinkfile"
					# link will be pointing to nowhere
					if test -L $line; then
						rm -f $line
					fi
				ln -s $liblinkfile $line 
	                      done
			else
				echo "WARNING: Source file [$PREFIX$line] is missing!"
			fi
                fi
	done
}

remove () {
	echo "*** Removing $PACKAGE"

	echo "$files" |
	while read line; do
		if [ -e "$line" ]; then
			# File/Directory exists.
			if [ -d "$line" ]; then
				# Directory.
				contents=$(ls -1 "$line")
				if [ ! "$contents" ]; then
					# Empty directory
					rmdir "$line"
				fi
			elif [ -L "$line" ]; then
				rm "$line"
			fi
		fi
	done
}

list () {
	filelist=""
	files=`ls -1 $LOCATION/usr/lib/opkg/info/*.list`
	for filename in $files; do
		filename=${filename##*/}
		filename=${filename%%.list}
		filelist="$filelist $filename"
	done
}

COMMAND=$1
PACKAGE=$2
LOCATION=$2

if [ $# -ne 2 ]
then
	usage
fi

echo "*** Command: $COMMAND"
case "$COMMAND" in
	"add" )
		findpackage
		add
		;;
	"remove" )
		findpackage
		remove
		;;
	"list" )
		list
		for file in $filelist; do
			echo $file
		done
		;;
	"mount" )
		list
		for file in $filelist; do
			$0 add $file
		done
		;;
	"umount" )
		list
		for file in $filelist; do
			$0 remove $file
		done
esac

echo "*** Done."
echo ""
exit