#!/bin/sh

set -e

COUNT=0

# http://packages.debian.org/sid/kfreebsd-amd64/libppl9/download
DEBMD5="2f20593dc5484d7428a4e9405e26cab0"
if [ ! -f libppl9_0.11.2-6_kfreebsd-amd64.deb ]; then
	wget http://ftp.uk.debian.org/debian/pool/main/p/ppl/libppl9_0.11.2-6_kfreebsd-amd64.deb
fi
DWNLDDEB=`md5sum libppl9_0.11.2-6_kfreebsd-amd64.deb | cut -d' ' -f1`
if [ "$DWNLDDEB" != "$DEBMD5" ]; then
	echo "Failed to download the correct file!"
	echo "$DWNLDDEB $DEBMD5"
	exit 5
fi
if [ -d ./usr ]; then
	rm -rf ./usr/
fi
if [ -f data.tar.gz ]; then
	rm data.tar.gz
fi
ar -x libppl9_0.11.2-6_kfreebsd-amd64.deb
tar -xzf data.tar.gz
ORIGMD5="0e52e84eebf41588865742edaff7b3c0"
DWNLDMD5=`md5sum ./usr/share/doc/libppl9/CREDITS.gz | cut -d ' ' -f1`
if [ "$ORIGMD5" != "$DWNLDMD5" ]; then
	echo "failed to extract the file correctly."
	exit 4
fi
BUGMD5="99e2b9f8972ce00cfe57e3735881015e"
if [ "$BUGMD5" = "$DWNLDMD5" ]; then
	echo "file no longer shows the same bug."
	exit 3
fi
if [ -f control.tar.gz ]; then
	rm control.tar.gz
fi
if [ -f data.tar.gz ]; then
	rm data.tar.gz
fi
# now redo the compression (which shouldn't change the checksum but does)
cp ./usr/share/doc/libppl9/CREDITS.gz .
gunzip -f CREDITS.gz
CONTENT=`sha256sum CREDITS | cut -d ' ' -f1`
touch CREDITS
gzip -9nf CREDITS
REDONEMD5=`md5sum ./CREDITS.gz | cut -d ' ' -f1`
# repeat redoing the compression until it changes again or the tester gets bored.
while [ "$BUGMD5" = "$REDONEMD5" ]; do
	gunzip -f CREDITS.gz
	CHECK=`sha256sum CREDITS|cut -d ' ' -f1`
	if [ "$CHECK" != "$CONTENT" ]; then
		echo "contents of the file have changed!"
		exit 2
	fi
	touch CREDITS
	gzip -9nf CREDITS
	REDONEMD5=`md5sum ./CREDITS.gz | cut -d ' ' -f1`
	COUNT=$((COUNT+1))
	echo -n "$COUNT, "
	perl -e 'select(undef,undef,undef,.3)'
done
echo "CREDITS.gz failed to decompress & recompress to the same file!"
echo "$BUGMD5 $REDONEMD5"