#!/bin/bash
#
# usage:  check2updates <Master RPMS directory> <Master RPMS4 directory> <updates directory>
#
#       Examines each update file to see if it is newer than one in the master set.
#       If it is, then the older one is removed and the update copied to the master
#       set.
#
#       If an update package is found that is not in the master set, its name is
#       placed in the file "new_rpms.list" for you to manually deal with.
#

# first some Constants
MASTER_FILES="masterfiles.list"
UPDATE_FILES="updatefiles.list"
SELECT_FILES="selections.list"
NEW_RPMS="new_rpms.list"

# and variables
masterfile=""
mastername=""
masterversion=""
masterrelease=""

updatefile=""
updatename=""
updateversion=""
updaterelease=""

master=""
master4=""
updates=""

# then some functions

decide_action ()
{
     missing=0

     for masterfile in `cat $SELECT_FILES`
     do
          if [ "`basename $masterfile`" = "$updatefile" ]; then
               return 2
          fi

          get_master_info "$masterfile"

          if [ "$mastername" = "$updatename" ]; then
               missing=1

               # this is the right one
               if [ `expr $masterversion \< $updateversion` = "1" ]; then
                    return 0

               elif [ "$masterversion" = "$updateversion" ]; then
                    if [ `expr $masterrelease \< $updaterelease` = "1" ]; then
                         return 0
                    fi
               fi
               return 2
          fi
     done

     if [ $missing -eq 0 ]; then
          # update has no match in master list
          return 1
     fi

     # no need to update this one
     return 2
}

get_update_info ()
{
     #   $1 is name of package to query

     updatename=`rpm -qp --nosignature --queryformat %{NAME} $1`
     updateversion=`rpm -qp --nosignature --queryformat %{VERSION} $1`
     updaterelease=`rpm -qp --nosignature --queryformat %{RELEASE} $1 | sed s/mdk//`
}


get_master_info ()
{
     #   $1 is name of package to query

     mastername=`rpm -qp --nosignature --queryformat %{NAME} $1`
     masterversion=`rpm -qp --nosignature --queryformat %{VERSION} $1`
     masterrelease=`rpm -qp --nosignature --queryformat %{RELEASE} $1 | sed s/mdk//`
}

#
#
# finally the main entry point
#

if [ $# -ne 3 ]; then
     echo "usage: <Master RPMS> <Master RPMS4> <Update RPMS>"
     exit 1
fi

if [ ! -d "$1" ]; then
     echo "Need directory name for Master RPMS."
     exit 1
fi
master="$1"

if [ ! -d "$2" ]; then
     echo "Need directory name for Master RPMS4."
     exit 1
fi
master4="$2"

if [ ! -d "$3" ]; then
     echo "Need directory name for Update RPMS."
     exit 1
fi
updates="$3"

#clean up old files from previous runs
rm -f $NEW_RPMS

# create list of Update RPMS
ls $updates/* | sed 's|'$updates'/||' > $UPDATE_FILES

# and for the master RPMS
ls $master/*   > $MASTER_FILES
ls $master4/* >> $MASTER_FILES

# lets do it
for updatefile in `cat $UPDATE_FILES`
do
     # get update package info
     echo "Check status of update package: $updatefile."
     get_update_info "$updates/$updatefile"

     grep ".*/$updatename" $MASTER_FILES > $SELECT_FILES
     if [ $? -eq 0 ]; then

          decide_action
          result=$?

          case $result
          in
               0)   # replace, new update
                    echo "  Replacing `basename $masterfile` with $updatefile"
                    rm -f $masterfile
                    cp "$updates/$updatefile" "`dirname $masterfile`/"
                    ;;

               1)  # missing from master list
                    echo "  Update does not exist in the Master File Set: $updatefile"
                    echo "$updatefile" >> $NEW_RPMS
                    ;;

               *)  # skip, update already in Master, but make sure it really is..
                    if [ ! "`basename $masterfile`" = "$updatefile" ]; then
                         echo "  ERROR Skipping Master file: $masterfile"
                                fi
                    ;;
          esac

     else

          # the update is a new package, report and add to new list
          echo "  Update does not exist in the Master File Set: $updatefile"
          echo "$updatefile" >> $NEW_RPMS
     fi
done

# clean up junk files
rm -f $MASTER_FILES
rm -f $UPDATE_FILES
rm -f $SELECT_FILES

exit 0

#