#!/bin/bash
# -------
# File:        version-candidate-check
# Description: Compares current source version with apt-cache policy candidate
#              The intended use is to detect Ubuntu version upgrades of mod(ified) packages
# Author:      Luis Garcia Gisbert <garcia_luigis@gva.es>
# 
# 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.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along 
# with this program; if not, write to the Free Software Foundation, Inc., 
# 51 Franklin St, Fifth Floor, Boston MA 02110-1301 USA
# --------

. /usr/share/lliurex/llxcfg-dev/llxcfg-dev.sh

test_dir(){
   [ "$1" ] || return 1
   [ -d "$1" ] || return 1
   [ -r "$1/debian/control" ] || return 1
   return 0
}

get_candidate(){
   REG_EXP="^[[:blank:]]\+Candidate:[[:blank:]]\+"
   LANG=C apt-cache policy "$1" 2>/dev/null |sed -ne "/$REG_EXP/s%$REG_EXP%%p"
}

test_version(){
   CURDIR="$(pwd)"
   cd "$1"
   CURRENT_V="$(dl_get_version)"
   for p in $(dl_list_binpkgs) ; do
      CANDIDATE_V="$(get_candidate "$p")"
      printf "Source: $(dl_show_field Source SOURCE) . Package: $p ... "
      if [ "$CANDIDATE_V" ] ; then
         rc=0
         dpkg --compare-versions "$CANDIDATE_V" eq "$CURRENT_V" || rc=$?
         if [ $rc -eq 0 ] ; then
            echo "OK (Current version is equal to candidate)"
         else
            rc=0
            dpkg --compare-versions "$CANDIDATE_V" lt "$CURRENT_V" || rc=$?
            if [ $rc -eq 0 ] ; then
               echo "OK (Current version greather than candidate)"
            else
               echo "WARNING: candidate version ($CANDIDATE_V) is greater than current ($CURRENT_V)"
            fi
         fi
      else
         echo "OK (no candidate)"
      fi
   done
   cd "$CURDIR"
}


# main
if test_dir "./" ; then
   echo "Working in current directory"
   test_version "./"
else
   echo "Searching subdirectories"
   for d in $(find ./ -maxdepth 1 -mindepth 1 -xtype d) ; do
      if test_dir "$d" ; then
         test_version "$d"
      else
         echo "Skipping directory $d"
      fi
   done
fi

exit 0