#!/bin/bash
#
#  CHECK_UPDATE -- Check to see if an update is available.  Return $status=1
#  if a patch is available.
#

# Initialize the $iraf and environment.
if [ -z "$iraf" ]; then
  if [ -e "$HOME/.iraf/setup.sh" ]; then
    source $HOME/.iraf/setup.sh
  else
    source unix/hlib/setup.sh
  fi
else
    source $iraf/unix/hlib/setup.sh
fi


# Called from Makefile, set iraf root.
source $iraf/unix/hlib/irafuser.sh


REPO=`${iraf}/util/pkgrepo`
if [ -n $IRAFARCH ]; then
    arch=$IRAFARCH
else
    arch=`${iraf}/unix/hlib/irafarch.sh -actual`
fi


# Check to see if a patch file is available.

/bin/rm -f /tmp/_rdate /tmp/_pdate

FGET="${iraf}/util/fget"
${FGET} -q -o /tmp/_rdate http://iraf.noao.edu/ftp/v216/PCIX/.release_date
${FGET} -q -o /tmp/_pdate http://iraf.noao.edu/ftp/v216/PCIX/.patch_release

if [ -e /tmp/_rdate ]; then
    rdate=`cat /tmp/_rdate`
else
    /bin/echo "cannot get rdate"
    exit 0
fi
if [ -e /tmp/_pdate ]; then
    pdate=`cat /tmp/_pdate`
else
    echo "cannot get pdate"
    exit 0
fi


if [ -e ${iraf}/.patch_release ]; then
    ipdate=`/bin/ls -l --time-style=+%s ${iraf}/.patch_release | awk '{ print ($6) }'`
else
    ipdate=0
fi

if [ "$1" == "-d" ]; then			# Debug
  /bin/echo " rdate = " $rdate
  /bin/echo " pdate = " $pdate
  /bin/echo "ipdate = " $ipdate
fi

if (( $rdate>$pdate )); then			# New Release
    exit 1
fi


if (( $pdate==0 )); then
    exit 0				
elif (( $pdate>$ipdate && $ipdate!=0 )); then	# Patch newer than installed
    exit 1
fi


exit 0						# No update available