source: ipk/ipkg-utils-050831/ipkg-link@ 20103

#!/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>

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/ipkg.conf
        then
                valid_mount_points=`cat /etc/ipkg.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/ipkg/info/$PACKAGE.list" ]; then
                        PREFIX="$mount_point"
                        files=`cat "$PREFIX/usr/lib/ipkg/info/$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
        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/ipkg/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