#!/bin/bash

# Copyright (C) 2012 by Steve Litt
# 
# 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.


function check_useage(){
	let errcount=0
	if test "`whoami`" != "root"; then
		echo 
		echo Error: Must be root to use this program. Use sudo.
		echo
		let errcount=$errcount+1
	fi
		
	num_args=$1
	if test "$num_args" != "2"; then
		echo
		echo "Error: Must have 2 arguments. You had $num_args"
		echo
		let errcount=$errcount+1
	fi
	#echo errcount is $errcount
	if test $errcount -ne 0; then
		echo USAGE:
		echo sudo ./verify_disc bluray_device    mountpoint
		echo
		exit 1
	fi
}
	

function comp_one(){
	echo
	echo
	fmd5=$1

	ftgz=`echo $fmd5 | sed -e "s/\.md5$/.tgz/"`

	echo -n Testing $fmd5 and $ftgz ...
	echo

	md5stored=`cut -b1-32 < $fmd5`
	md5live=`md5sum $ftgz | cut -b1-32`
#	md5live="simulateerror"

	echo Results, stored vs live:  $md5stored   $md5live

	echo -n `date "+%Y%m%d at %k%M%S"` >> $logg
	if test "$md5live" == "$md5stored"; then
		echo " Md5sum OK for $fmd5" >> $logg
		echo "              Md5 is $md5stored" >> $logg
		echo " Md5sum OK for $fmd5"
	else
		echo " Md5sum !!ERROR!! for $fmd5" >> $logg
		echo "    Stored md5=$md5stored, live=$md5live" >> $logg
		echo " Md5sum !!ERROR!! for $fmd5"
		let numerrors=$numerrors+1
	fi
}

##### MAIN PROGRAM STARTS HERE #####
check_useage $#

mount $1 $2
cd $2

let numerrors=0
export numerrors
logg=/home/slitt/verify_disc.log
export logg

echo >> $logg

### VERIFY RUN HEADER
echo -n "======= " >> $logg
echo -n `date "+%Y%m%d at %k%M%S"` >> $logg
echo -n " Starting new disc verify." >> $logg
echo  " =======" >> $logg

### LOOP THROUGH DISC
shopt -s nullglob
let md5count=0
for i in *.md5; do
	comp_one $i
	let md5count=$md5count+1
done

### VERIFY RUN FOOTER
echo -n "======= " >> $logg
echo -n `date "+%Y%m%d at %k%M%S"` >> $logg
echo -n " Disc verify finished. " >> $logg
if test $numerrors -eq 0; then
	echo -n "Congrats, all files, $md5count total, verified." >> $logg
else
	echo -n "ERROR count is " >> $logg
	echo -n $numerrors >> $logg
fi
echo " =======" >> $logg
echo >> $logg
echo

cd -
umount $1