#! /bin/bash 
#USEAGE: update-distr [-f] [-v] path/to/updates
#     update rpms found in path/to/updates/RPMS
#     -f use --nodeps on second try to update rpms
#     -v verbose output
# Note that -f and -v must be used in that order and cannot be combined
# into -fv or -vf
# This script updates the system from the files found in the first
# arguement. 

if [ $# -lt  1 -o $# -gt 3 ]; then
  echo "Usage: update-distr updates_dir "
  echo "       where updates_dir  has the updated files in the RPMS directory,"
  exit 1
fi

VERBOSE=0
REDIR=">/dev/null"
QUAL=""
if [ "$1" = "-f" ]; then
  QUAL="--nodeps"
  shift
fi
if [ "$1" = "-v" ]; then
  VERBOSE=1
  REDIR=""
  shift
fi
UPROOT="$1"

UPDDIR=${UPROOT}/RPMS
if [ ! -d $UPDDIR ] ; then
  echo Update directory $UPDDIR does not exit >&2
  exit 1
fi

shopt -s nullglob

NDO=0
for rpm in ${UPDDIR}/*.rpm ; do
#  Get the short name of the rpm file
 NAME=`rpm --queryformat "%{NAME}" -qp $rpm 2>/dev/null`
 VERSION=`rpm  -qp $rpm 2>/dev/null`
 if [ -n "$NAME" ]; then
#     find files in the distributions which start with that name

   if  OVERSION=`rpm -q $NAME 2>/dev/null ` ; then

     if rpm -q $VERSION >/dev/null 2>&1 ; then
      if [ $VERBOSE -eq 1 ]; then
       echo $VERSION already installed
      fi
     else
      echo Updating  $OVERSION from $rpm
      if [ $VERBOSE -eq 1 ]; then
       rpm -Fhv $rpm 
      else
       rpm -Fhv $rpm >/dev/null
      fi
      if [ $? -ne 0 ]; then
       NDO=$[NDO +1]
       REDO[$NDO]=$rpm
      fi
     fi
    fi
  fi
done

if [ $NDO -gt 0 ];then
  if [ $VERBOSE -eq 1 ]; then
    echo
    echo "Trying again with problem rpms"
  fi
  echo
  NC=1
  while [  $NC -le $NDO ]; do
    rpm=${REDO[$NC]}
    NC=$[NC+1] 
    rpm -Fhv  $rpm
    if [ $? -ne 0 ]; then
      echo
      echo Unable to update $rpm on second round. >&2
      if [ -n "$QUAL" ]; then
        echo Look at the errors above: Do you want to
        echo -n  force the installation of this package{y/n}:
        read RESP
        if [ -z "$RESP" ]; then
          RESP=n
        fi
        case $RESP in
          [Yy]*)  rpm -Uhv $QUAL $rpm  ;;
        esac
      else
       echo "    Check error and try again" >&2
      fi
      echo
    else
     if [ $VERBOSE -eq 1 ]; then
       echo "Updated $rpm"
     fi 
    fi
  done
fi
exit 0