#!/bin/ksh -p

# script to update patches on a machine. See usage() below
# Written by Philip Brown


patchdir=`dirname $0`
cd $patchdir


usage()
{
	print "usage: patchupdate [-R /root/dir]"
	print "patchupdate uses patchcompare to figure out what patches are downrev,"
	print " and will then install them, using the patch_order file in the directory"
}


if [[ "$1" = "-h" ]] ; then
	usage
	exit
fi


if [[ "$1" = "-R" ]] ; then
	ROOTARGS="$1 $2"
	shift
	shift
fi

if [[ ! -f patch_order ]] ; then
	print ERROR: need a patch_order file
	exit 1
fi

######################################################################
# End of prep work. real stuff starts here

TMPFILE=/tmp/patchupdate.$$
rm $TMPFILE; touch $TMPFILE

./patchcompare $ROOTARGS -l |awk -F: >$TMPFILE
count=`wc -w $TMPFILE`
if [[ ! -s $TMPFILE ]] ; then
	print No patches to add
	rm $TMPFILE
	exit 0
else
	print Attempting to apply $count patches
fi

patchadd $ROOTARGS -M . `fgrep -f $TMPFILE patch_order`


rm $TMPFILE