#!/bin/sh
#
# warnpkg -- a tool to scan Slackware packages for files that would be
#            overwritten
#
# Copyright (c) 2007 Brian "Beej Jorgensen" Hall <beej@beej.us>
# 
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#

if [ $# -ne 1 ]; then
	echo "usage: `basename $0` package.tgz"
	exit 1
fi

if [ ! -e $1 ]; then
	echo "`basename $0`: $1: file not found."
	exit 2
fi

#echo "Checking package $1..."

allfiles=`tar tzvf $1 | grep -v ^d | awk '{print "/" $6}'`

if ( echo $allfiles | grep install/doinst.sh > /dev/null ); then
	rmrffiles=`tar -O -xzvf $1 install/doinst.sh 2>/dev/null | grep ' rm -rf' | awk '{print "/" $3 "/" $7}'`
else
	rmrffiles=''
fi

sep='15c554f9-5351-4d4f-913a-156a08556202'  # random unique
mode=0
first=1

for a in $rmrffiles $sep $allfiles
do
	if [ $a = $sep ]; then
		mode=1
		continue
	fi

	if [ -e $a ]; then
		if [ $first -eq 1 ]; then
			first=0
			echo -n "Existing files that will be affected are"
			if [ "x$rmrffiles" != "x" ]; then
				echo -n " (*** means rm -rf!)"
			fi
			echo ":"
		fi
		echo -n "   $a"
		if [ $mode -eq 0 ]; then
			echo " [***]"
		else
			echo ""
		fi
	fi
done

if [ $first -eq 1 ]; then
	echo "No existing files will be affected."
fi

exit 0