#!/usr/bin/perl -w

use strict;
use diagnostics;

# Device that is the DVD drive
my $DVD=("/dev/hdc");

# Size of each slice - DVD max is 4482M
# MC - for testing
# my $SLICE_SIZE=("10M");
# my $SLICE_SIZE=("4400M"); # doesn't work
# BUG - Linux isofs limited to single files of 2^32=4096MB
# my $SLICE_SIZE=("4000M");
# value used by Daromizer is bigger than mine, use it
# my $SLICE_SIZE=("4189500K");
# need more space for parity data
my $SLICE_SIZE=("4000M");

# directory that all paths must be relative to
# NOTE - all backup paths are relative to this
my $ROOT_DIR=("/mnt/backup");

# where all created files will be stored
my $STORAGEDIR=("/mnt/backup/backups/");

# list of dirs to be backed up
# NOTE 1 - these are paths relative for $ROOT_DIR, above
# NOTE 2 - this is used for naming; everything after the last / is used
# for the base name. DO NOT have two things be the same (like /usr/bin and 
# /usr/local bin). Otherwise, one will be overwritten
# MC for testing
# my @BACKUPDIRS=("test");
my @BACKUPDIRS=("local","home","pub");

# this the path to the slice as expressed in things that dar will
# substitute the right values for (it's just used in 2 places)
my $SLICE_PATH=("%p/%b.%n.%e");
my $SLICE_NAME=("%b.%n");

my $PARITY_PATH=("%p/%b.%n.par2");
# par2 creates a bunch of "vol" files, we need those too
my $PARITY_FILES=("%p/%b.%n.*.par2");

# list of stuff to be compressed. This must be in the form of
# -Z \"*.mask\"
# with -Z repeated for each one
my $NO_COMPRESS_LIST=("-Z \"*.gz\" -Z \"*.GZ\" -Z \"*.bz2\" -Z \"*.BZ2\" -Z \"*.zip\" -Z \"*.ZIP\" -Z \"*.ogg\" -Z \"*.OGG\" -Z \"*.mp3\" -Z \"*.MP3\" -Z \"*.mpg\" -Z \"*.MPG\" -Z \"*.mpeg\" -Z \"*.MPEG\" -Z \"*.wmv\" -Z \"*.WMV\" -Z \"*.avi\" -Z \"*.AVI\" -Z \"*.jpg\" -Z \"*.JPG\" -Z \"*.jpeg\" -Z \"*.JPEG\" -Z \"*.png\" -Z \"*.PNG\" -Z \"*.gif\" -Z \"*.GIF\"");

my $PRE_PARITY_MESSAGE=("echo ; echo Caclulating parity information; echo");

my $PARITY_COMMAND=("par2create -r10 $PARITY_PATH $SLICE_PATH");

my $PRE_BLANK_MESSAGE=("echo ; echo Done archive, erasing DVD; echo");

my $BLANK_COMMAND=("dvd+rw-format -force /dev/hdc");

my $PRE_REC_MESSAGE=("echo ; echo Done erasing, burning to DVD; echo");

# Command to record the DVD, with options
# -dvd-compat = make the most compatible DVD by closing the session
# -Z = create a new session
# -r = generate sane rock ridge extensions
# -J = generate Joliet extensions
# -V = volume ID
# %b = dar will substitute the base name
# %n = dar will substitute the number of the slice
# %p = dar will substitute slice path
# FOR TESTING = -dry-run
my $RECORD_COMMAND=("growisofs -dvd-compat -Z $DVD  -r -J -V $SLICE_NAME $SLICE_PATH $PARITY_PATH $PARITY_FILES");

my $EJECT_COMMAND=("eject $DVD");

my $POST_REC_MESSAGE=("echo ; echo Done burning $SLICE_NAME ; echo");

# deletes files once done with them
# note - use AFTER record command
# MC - for testing
# my $DELETE_COMMAND=("echo deleting $SLICE_PATH $PARITY_PATH $PARITY_FILES");
my $DELETE_COMMAND=("rm -f $SLICE_PATH $PARITY_PATH $PARITY_FILES");

# dar with basic options
# -y = compress with bzip2 using default compression of 6
# -s = slice it up
# -R = root dir that all things to be backed up live in
# -D = store empty directories too
# -p = pause and wait for user to change DVD before continuing
# -c (used below) = create an archive called whatever
# FOR TESTING = -e
my $DAR=("dar -y -s $SLICE_SIZE -R $ROOT_DIR -D $NO_COMPRESS_LIST -p -E \"$PRE_PARITY_MESSAGE ; $PARITY_COMMAND ; $PRE_BLANK_MESSAGE ; $BLANK_COMMAND ; $PRE_REC_MESSAGE ; $RECORD_COMMAND ; $EJECT_COMMAND ; $DELETE_COMMAND ; $POST_REC_MESSAGE\""); 

&main;

sub main{
    my $backup_base;
    my $backupdir;
    my ($day, $month, $year) = (localtime)[3,4,5];
    $year+=1900; # compensate for 1900 based year
    $month+=1; # compensate for base 0 months
    my $targetbase;
    my $pause; # garbage input...

    foreach $backupdir (@BACKUPDIRS){
	# this gets rid of paths and such from $backupdir, just in case
	$backup_base=$backupdir;
	$backup_base =~ s/^\///;   # remove leading /
	$backup_base =~ s/\w+\///g;   # remove everything matching "someword/"
	$targetbase=$STORAGEDIR.$backup_base."_".$month."_".$day."_".$year;

 	print("Working on $backup_base\n");

# MC for debugging
#	print("Command is: $DAR $backupdir -c $targetbase");

	system("$DAR $backup_base -c $targetbase");

	print "Work on $backup_base complete. Change the DVD and\n";
	print "press any key to continue...";
	$pause = <STDIN>;  #Like a PAUSE statement in DOS .bat files
    }
}
