#! /bin/sh
#----------------------------------------------------------------------------
# check-version - check a package-version
#
# usage: check-version package_name check_version
# or:    check-version -diff version-1 version-2
#
# return values as output on stdout:
#
# new           - version is newer than the installed package
# old           - version is older than the installed package
# installed     - version of package is identical (installed)
# not-installed - package is not installed
#
# Copyright (c) 2003-2003 Frank Meyer <frank@eisfair.org>
#
# Creation:     19.07.2003  fm
# Last Update:  $id$
#
# 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.
#----------------------------------------------------------------------------

new_status="new"
old_status="old"
inst_status="installed"
notinst_status="not-installed"

read_package_version ()
{
    f=$1

    while read l
    do
        case "$l"
        in
            "<version>"*)
                l=`echo "$l" | sed 's#</*version>##g'`
                set -- $l
                have_package_version="$1"
                ;;
        esac
    done < $f
}

split_version ()
{
    v=$1
    cvs=''

    case $v
    in
        1.0beta)
            v=0.90.0
            ;;
        1.0beta-patch-*)
            IFS='-'
            set -- $v
            unset IFS
            v=0.90.$3
            ;;
        *cvs*)
            cvs=`echo "$v" | sed 's/^.*cvs//'`
            v=`echo "$v" | sed 's/cvs.*$//'`
            ;;
    esac

    case "$v"
    in
        [0-9]*.[0-9]*.[0-9]*)
            IFS='.'
            set -- $v
            unset IFS
            major=$1
            minor=$2
            revision=$3
            ;;
        [0-9]*.[0-9]*)
            IFS='.'
            set -- $v
            unset IFS
            major=$1
            minor=$2
            revision=0
            ;;
        *)
            major=0
            minor=0
            revision=0
            ;;
    esac
}

diff_version ()
{
    vv1=$1
    vv2=$2

    split_version $vv1
    vv1_major=$major
    vv1_minor=$minor
    vv1_revision=$revision
    vv1_cvs=$cvs

    split_version $vv2
    vv2_major=$major
    vv2_minor=$minor
    vv2_revision=$revision
    vv2_cvs=$cvs

    ### first compare major version
    if [ $vv1_major -lt $vv2_major ]
    then
        diff_status=$old_status
    elif [ $vv1_major -gt $vv2_major ]
    then
        diff_status=$new_status

    ### next try minor version
    elif [ $vv1_minor -lt $vv2_minor ]
    then
        diff_status=$old_status
    elif [ $vv1_minor -gt $vv2_minor ]
    then
        diff_status=$new_status

    ### last try revision
    elif [ $vv1_revision -lt $vv2_revision ]
    then
        diff_status=$old_status
    elif [ $vv1_revision -gt $vv2_revision ]
    then
        diff_status=$new_status

    ### if all is equal, look if a package has a cvs version
    elif [ "$vv1_cvs" = "" -a "$vv2_cvs" = "" ]
    then
        diff_status=$inst_status

    ### cvs versions always equals matching non-cvs versions
    elif [ "$vv1_cvs" = "" -a "$vv2_cvs" != "" ]
    then
        diff_status=$inst_status
    elif [ "$vv1_cvs" != "" -a "$vv2_cvs" = "" ]
    then
        diff_status=$inst_status

    ### now compare the cvs date
    elif [ `/usr/bin/expr "$vv1_cvs" \< "$vv2_cvs"` = "1" ]
    then
        diff_status=$old_status
    elif [ `/usr/bin/expr "$vv1_cvs" \> "$vv2_cvs"` = "1" ]
    then
        diff_status=$new_status

    ### now difference was found
    else
        diff_status=$inst_status
    fi
}


if [ "$1" = "-diff" ]
then
    shift
    v1=$1
    v2=$2

    diff_version $v1 $v2
    package_status="$diff_status"
else
    package_name=$1
    check_version=$2

    if [ -f /var/install/packages/$package_name ]
    then
        read_package_version /var/install/packages/$package_name
        diff_version $check_version $have_package_version
        package_status="$diff_status"
    else
        package_status="$notinst_status"
    fi
fi

echo $package_status