#!/bin/sh
#----------------------------------------------------------------------------
# /var/install/bin/check-package-usage - check if package is still in use
#
# Copyright (c) 2005 The Eisfair Team, c/o Frank Meyer, frank(at)eisfair(dot)org
#
# Creation:     2005-11-29  jed
# Last Update:  $Id$
#
# Usage:
#   check-package-usage [-noref]
#         : list of all unreferenced packages
#
#   check-package-usage [-quiet] package-name
#         : list of packages which have set a reference to package-name
#
# Result: 0 - no reference found
#         1 - references found!
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#----------------------------------------------------------------------------

# include eislib
. /var/install/include/eislib

#exec 2>./check-package-usage-trace-$$.log
#set -x

#----------------------------------------------------------------------------
# create_reference_list
#
# create package reference list and write it to file $ref_list
#----------------------------------------------------------------------------
create_reference_list ()
{
    for j in /var/install/packages/*
    do
        outflag=0
        pack_name="`basename $j`"

        req_packages="`grep -E "<require>" ${j} | \
          sed -e 's#.*<require>##g' -e 's#</require>.*##g' \
              -e 's#\.tar.*##g' -e 's#-.*##g' -e 's#.*\/##g' | \
          cut -d' ' -f1 | tr '\012' ' '`"

        if [ "$req_packages" != "" ]
        then
            req_packages="$req_packages "
        fi

        req_packages="${req_packages}`grep -E "<require-package>" ${j} | \
          sed -e 's#.*<require-package>##g' -e 's#</require-package>.*##g' \
              -e 's#\.tar.*##g' -e 's#.*\/##g' | \
          cut -d' ' -f1 | tr '\012' ' '`"

        if [ "$req_packages" != "" ]
        then
            req_packages="$req_packages "
        fi

        req_packages="${req_packages}`grep -E "<require-lib>" ${j} | \
          sed -e 's#.*<require-lib>##g' -e 's#</require-lib>.*##g' \
              -e 's#\.tar.*##g' -e 's#.*\/##g' | \
          cut -d' ' -f1 | tr '\012' ' '`"

        if [ "$req_packages" != "" ]
        then
            for n in $req_packages
            do
                echo "$n:$pack_name:"
            done

            outflag=1
        fi

        if  [ $outflag -eq 0 ]
        then
            echo "-noref-:$pack_name:"
        fi
    done | sort | uniq > $ref_list
}

#============================================================================
# main
#============================================================================

ref_list=/var/tmp/packages-reference-list.txt

pgmname=`basename $0`

if [ $# -eq 0 ]
then
    mecho "Usage:"
    mecho "  $pgmname [-noref]              - list of all unreferenced packages"
    mecho "  $pgmname [-quiet] package-name - list of referencing packages"

    exit 1
else
    noref=0
    quiet=0

    case $1 in
        '-noref')
            noref=1
            shift
            ;;
        '-quiet')
            quiet=1
            shift
            ;;
        *)
            ;;
    esac

    search_package="$1"
fi

create_reference_list

if [ $noref -eq 1 ]
then
    # list unreferenced packages
    search_package='-noref-'
fi

# search package references
grep -q "^$search_package:" $ref_list

if [ $? -eq 0 ]
then
    # package references found
    for pack in `grep "^$search_package:" $ref_list`
    do
        _ifsold=IFS
        IFS=:
        set -- $pack
        IFS=$_ifsold

        if [ "$package_list" = "" ]
        then
            package_list="$2"
        else
            package_list="$package_list $2"
        fi
    done

    # print result
    if [ $quiet -eq 0 ]
    then
        echo "$package_list"
    fi

    rtc=1
else
    # no package reference found
    rtc=0
fi

exit $rtc
#============================================================================
# end
#============================================================================