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#!/usr/bin/perl -w
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# Copyright (c) 2010-2014, AllWorldIT
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#
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# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
#
# Author: Nigel Kukard <nkukard@lbsd.net>


# TODO:
# - USE incremental backups!!!! fucking awesome
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#
# - Read in defaultSystemExcl extras from /proc/mounts
# - proc, nfs, nfs4, fusectl fuse.glusterfs, sysfs, tmpfs, devtmpfs, devpts
#
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use strict;
use Compress::Zlib;
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use Config::IniFiles;
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use Cwd;
use Fcntl qw (:mode);
use File::Find;
use File::Path qw( rmtree mkpath );
use File::Spec;
use Getopt::Long;
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use POSIX qw (strftime lchown);
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use Data::Dumper;
use MIME::Base64;



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my $VERSION = "0.0.x";
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# System dirs we don't care about
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my @defaultSystemExcl = ("/dev","/run","/proc","/sys","/misc","/media","/mnt");
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# These should be backed up separately
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my @defaultDataExcl = (
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		# We cannot backup the DB reliably by just copying files
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		# NK: Unless if we snapshotting the FS first
		#"/var/lib/mysql","/var/lib/pgsql",
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		# Exclude amavis working files
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		"/var/amavis/tmp/",
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		"/var/lib/amavis/tmp/",
		"/var/spool/amavis/virusmails/",

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		"/var/spool/mailman/retry",
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		# Exclude postfix queues
		"/var/spool/postfix/active",
		"/var/spool/postfix/defer",
		"/var/spool/postfix/deferred",
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		"/var/spool/postfix/public",
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		"/var/spool/postfix/private",
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		# Exclude squid cache
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		"/var/spool/squid",
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		# Yum cache
		"/var/cache/yum",
		# Apt cache
		"/var/cache/apt/archives",

		# cPanel
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		"/home/virtfs",

		# Temporary dirs
		"/tmp",
		"/var/tmp"
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);
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# Backup constants
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use constant {
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	LOG_DEBUG => 5,
	LOG_INFO => 4,
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	LOG_NOTICE => 3,
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	LOG_WARNING => 2,
	LOG_ERROR => 1
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};

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use constant {
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	ST_FILE_CHANGED => 1,
	ST_DIR_NEW => 2,
	ST_DIR_SYS => 4,
	ST_DIR_CHANGED => 8,
	ST_FILE_ATTR_CHANGED => 16,
	ST_FILE_NEW => 32
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};


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# Main config
my %config = (
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	'log-level' => LOG_NOTICE,
	'tar' => 'tar',
	'exclude-system' => 0,
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	'exclude-data' => 0,
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	'backup-upgrade' => 0,
	'compress' => "bzip2"
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);
# Choose default compression method
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if (checkPATH("xz")) {
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	$config{'compress'} = "xz";
}



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print(STDERR "AWIT-DBackup v$VERSION, Copyright (c) 2010-2014, AllWorldIT\n\n");
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# Grab options
my %optctl = ();
GetOptions(\%optctl,
	"help",

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	"config=s",
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	"log-level=i",
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	"tar=s",
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	"manifest-format=s",
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	"backup",
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	"backup-upgrade",
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	"compress:s",
	"exclude-system",
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	"system-base=s@",
	"system-dir=s@",
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	"tar-ignore-failed-read=s@",

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	"exclude-data",
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	"data-dir=s@",
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	"exclude-file=s@",
	"exclude-path=s@",
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	"exclude-fs-type=s@",

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	"restore",
	"tar-keep-newer",
	"tar-keep-old-files",
);

# Check for help
if (defined($optctl{'help'})) {
	displayHelp();
	exit 0;
}

# Check for invalid combination
if (defined($optctl{'backup'}) && defined($optctl{'restore'})) {
	print(STDERR "ERROR: Cannot backup AND restore at the same time\n\n");
	displayHelp();
	exit 1;
}

# Make sure we only have 2 additional args
if (@ARGV > 2 || @ARGV < 2) {
		print(STDERR "ERROR: Invalid number of arguments\n\n");
		displayHelp();
		exit 1;
}

# Check both dirs exist...
if (! -d $ARGV[0]) {
	print(STDERR "ERROR: Source directory '".$ARGV[0]."' does not exist!\n\n");
	exit 1;
}
if (! -d $ARGV[1]) {
	print(STDERR "ERROR: Destination directory '".$ARGV[1]."' does not exist!\n\n");
	exit 1;
}

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# If backup file is specified and it does not exist, throw an error
if (defined($optctl{'config'}) && ! -f $optctl{'config'}) {
	print(STDERR "ERROR: Configuration file '".$optctl{'config'}."' NOT found!\n");
	exit 1;
}
# Check config file was specified, if not set default
my $configFile;
if (!defined($configFile = $optctl{'config'})) {
	$configFile = "/etc/dbackup.conf";
}
# If we have a config file, read it in
if (-f $configFile) {
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	# Use config file, ignore case
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	tie my %inifile, 'Config::IniFiles', (
			-file => $optctl{'config'},
			-nocase => 1
	) or die "Failed to open config file '".$optctl{'config'}."': ".join("\n",@Config::IniFiles::errors);

	# Check if we actually have something...
	if (defined($inifile{'backup'})) {
		# Loop with config items
		foreach my $item (keys %{$inifile{'backup'}}) {
			$config{$item} = $inifile{'backup'}{$item};
		}
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	}
}

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#
# Process config
#
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if (!defined($config{'system-base'})) {
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	# Quick hack to see if we have a cmdline option
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	if (!defined($optctl{'system-base'})) {
		$config{'system-base'} = ["/"];
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	} else {
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		$config{'system-base'} = [];
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	}
} else {
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	$config{'system-base'} = toArray($config{'system-base'});
}

if (!defined($config{'system-dir'})) {
	$config{'system-dir'} = [];
} else {
	$config{'system-dir'} = toArray($config{'system-dir'});
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}

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if (!defined($config{'tar-ignore-failed-read'})) {
	$config{'tar-ignore-failed-read'} = [];
} else {
	$config{'tar-ignore-failed-read'} = toArray($config{'tar-ignore-failed-read'});
}

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if (!defined($config{'data-dir'})) {
	$config{'data-dir'} = [];
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} else {
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	$config{'data-dir'} = toArray($config{'data-dir'});
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}

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if (!defined($config{'exclude-file'})) {
	$config{'exclude-file'} = [];
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} else {
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	$config{'exclude-file'} = toArray($config{'exclude-file'});
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}

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if (!defined($config{'exclude-path'})) {
	$config{'exclude-path'} = [];
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} else {
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	$config{'exclude-path'} = toArray($config{'exclude-path'});
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}

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if (!defined($config{'exclude-fs-type'})) {
	$config{'exclude-fs-type'} = [];
} else {
	$config{'exclude-fs-type'} = toArray($config{'exclude-fs-type'});
}


#
# Check commandline options
#
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if (defined($optctl{'backup-upgrade'})) {
	$config{'backup-upgrade'} = 1;
}

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if (defined($optctl{'compress'})) {
	# Why use --compress with --restore?
	if (defined($optctl{'restore'})) {
		print(STDERR "WARNING: The use of --compress with --restore does not make sense\n");
	}

	# Make sure its valid
	if (
				$optctl{'compress'} ne "xz" &&
				$optctl{'compress'} ne "bzip2" &&
				$optctl{'compress'} ne "gzip" &&
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				$optctl{'compress'} ne "lz" &&
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				$optctl{'compress'} ne "none"
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	) {
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		print(STDERR "ERROR: Compression is invalid, valid values are: xz bzip2 gzip lz none\n\n");
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		displayHelp();
		exit 1;
	}
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	$config{'compress'} = $optctl{'compress'};
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}

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if (defined($optctl{'tar'})) {
	# Check if tar is executable
	if ( -x $optctl{'tar'}) {
		$config{'tar'} = $optctl{'tar'};
	} else {
		print(STDERR "ERROR: tar '".$optctl{'tar'}."' does not exist or is not executable\n");
	}
}
my $tarVer = getTarVer($config{'tar'});

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if (defined($optctl{'log-level'})) {
	$config{'log-level'} = $optctl{'log-level'};
}
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if (defined($optctl{'manifest-format'})) {
	if (
				$optctl{'manifest-format'} ne "null" &&
				$optctl{'manifest-format'} ne "newline"
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	) {
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		print(STDERR "ERROR: Manifest format is invalid, valid values are: null newline\n\n");
		displayHelp();
		exit 1;
	}
	$config{'manifest-format'} = $optctl{'manifest-format'};
}

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if (defined($optctl{'exclude-system'})) {
	$config{'exclude-system'} = 1;
}
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if (defined($optctl{'exclude-data'})) {
	$config{'exclude-data'} = 1;
}

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if (defined($optctl{'system-base'})) {
	push(@{$config{'system-base'}},@{$optctl{'system-base'}});
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}
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if (defined($optctl{'system-dir'})) {
	push(@{$config{'system-dir'}},@{$optctl{'system-dir'}});
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}
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if (defined($optctl{'tar-ignore-failed-read'})) {
	push(@{$config{'tar-ignore-failed-read'}},@{$optctl{'tar-ignore-failed-read'}});
}

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if (defined($optctl{'data-dir'})) {
	push(@{$config{'data-dir'}},@{$optctl{'data-dir'}});
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}
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if (defined($optctl{'exclude-file'})) {
	push(@{$config{'exclude-file'}},@{$optctl{'exclude-file'}});
}
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if (defined($optctl{'exclude-path'})) {
	push(@{$config{'exclude-path'}},@{$optctl{'exclude-path'}});
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}

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if (defined($optctl{'exclude-fs-type'})) {
	push(@{$config{'exclude-fs-type'}},@{$optctl{'exclude-fs-type'}});
}

if (@{$config{'exclude-fs-type'}} > 0) {
	# Pull in mounts
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	open(my $fh,"<","/proc/mounts")
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			or die "ERROR: Failed to open '/proc/mounts': $!";
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	while (my $line = <$fh>) {
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		chomp($line);
		# Split off items we need
		my (undef,$path,$type) = split(/\s+/,$line);
		# Loop with types and check
		foreach my $item (@{$config{'exclude-fs-type'}}) {
			if ($item eq $type) {
				push(@{$config{'exclude-path'}},$path);
			}
		}
	}
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	close($fh);
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}

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# Look for parallel versions of the compression program we going to use
$config{'compress-gzip'} = "gzip";
if (checkPATH("pigz")) {
	$config{'compress-gzip'} = "pigz";
}
$config{'compress-bzip2'} = "bzip2";
if (checkPATH("pbzip2")) {
	$config{'compress-bzip2'} = "pbzip2";
} elsif (checkPATH("lbzip2")) {
	$config{'compress-lbzip2'} = "lbzip2";
}
$config{'compress-xz'} = "xz";
if (checkPATH("pxz")) {
	$config{'compress-xz'} = "pxz";
} elsif (checkPATH("pixz")) {
	$config{'compress-xz'} = "pixz";
}
$config{'compress-lz'} = "clzip";
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if (checkPATH("plzip")) {
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	$config{'compress-lz'} = "plzip";
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} elsif (checkPATH("pdlzip")) {
	$config{'compress-lz'} = "pdlzip";
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}

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# Sanitize the source and dest
my $sourceDir = File::Spec->rel2abs($ARGV[0]);
my $destDir = File::Spec->rel2abs($ARGV[1]);


# Backup function
sub backup
{
	our ($source,$dest) = @_;


	# State infor for current dir
	our %doBackup;
	our %srcFileList;
	our %srcDirList;
	# Original .state file read in during backup
	our %origFileList;
	our %origDirList;
	our %origPathAttribs;
	# New attributes
	our %newPathAttribs;


	# Preprocess dir
	sub backup_preprocess {
		my @list = @_;

		# Strip first part of the path
		(my $path = $File::Find::dir) =~ s#^$source/?##;

		# Check if this dir should be backed up or not....
		if ( -f "$source/$path/.nodbackup" ) {
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			printLog(LOG_INFO,"S: Path '[$source]/($path)' EXCLUDED from backup with .nodbackup\n");
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			return ();
		}
		# Exclude trash folders
		if ( "$source/$path" =~ /(\.Trash-[0-9]{4})$/) {
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			printLog(LOG_INFO,"S: Path '[$source]/($path)' EXCLUDED from backup, Linux trash folder\n");
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			return ();
		}

		# Make sure even if we processing empty dirs that we actually record it
		if (!defined($srcFileList{$path})) {
			# Just set to empty hash ref
			$srcFileList{$path} = {};
		}

		# Exclude system directories
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		if ($config{'exclude-system'}) {
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			# Loop through system dirs
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			foreach my $sysdir (@{$config{'system-base'}}) {
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				# Loop with system paths
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				foreach my $excl (@defaultSystemExcl,@{$config{'system-dir'}}) {
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					# Sanitize path
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					my $testPath = File::Spec->rel2abs("$sysdir/$excl");
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					# Check...
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					if ("/$path" eq $testPath) {
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						printLog(LOG_INFO,"S: Path '[$source]/($path)' is a system directory, ignoring files\n");
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						$doBackup{$path} |= ST_DIR_SYS;
						return ();
					}
				}
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			}
		}
		# Check if we excluding data dirs
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		if ($config{'exclude-data'}) {
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			# Loop through system dirs
			foreach my $sysdir (@{$config{'system-base'}}) {
				# Loop with data dirs
				foreach my $excl (@defaultDataExcl,@{$config{'data-dir'}}) {
					# Sanitize path
					my $testPath = File::Spec->rel2abs("$sysdir/$excl");
					# Check...
					if ("/$path" eq $testPath) {
						printLog(LOG_INFO,"S: Path '[$source]/($path)' is a data directory, ignoring files\n");
						$doBackup{$path} |= ST_DIR_SYS;
						return ();
					}
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				}
			}
		}
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		# Exclude paths
		foreach my $item (@{$config{'exclude-path'}}) {
			# Check...
			if ("/$path" =~ $item) {
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				printLog(LOG_INFO,"S: Path '[$source]/($path)' is an excluded path, ignoring files\n");
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				$doBackup{$path} |= ST_DIR_SYS;
				return ();
			}
		}
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		# Check if this dir exists on the backup, if not we need to back it up obviously...
		if ( ! -d "$dest/$path") {
			$doBackup{$path} |= ST_DIR_NEW;
		# This can probably only be because a backup was continued
		} elsif ( ! -f "$dest/$path/.dbackup-state" ) {
			# First backup will never have the main dir .dbackup-state file existing
			if ($path ne "") {
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				printLog(LOG_WARNING,"State file '[$dest]/($path)/.dbackup-state' does not exist\n");
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			}
			$doBackup{$path} |= ST_DIR_NEW;
		}

		# Cannot read in for new dirs can we...
		if (($doBackup{$path} & ST_DIR_NEW) != ST_DIR_NEW) {
			# Load state file
			loadStateFile("$dest/$path/.dbackup-state",$path,\%origFileList,\%origDirList,\%origPathAttribs);

			# Check we have at least the version attribute
			if (!defined($origPathAttribs{$path}) || !defined($origPathAttribs{$path}->{'dbackup.version'})) {
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				printLog(LOG_ERROR,"No dbackup version information found in '[$dest]/($path)/.dbackup-state', IGNORING\n");
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				delete($origDirList{$path});
				delete($origFileList{$path});
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			# NK:
			# Sanity check, some versions created empty'ish .dbackup-state files with no sequence  < 2012-01-21
			# If we have a manifest, we should have a backup, therefore a format and sequence
			} elsif (
					-f "$dest/$path/dbackup0.manifest" && (
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						!defined($origPathAttribs{$path}->{'format'}) ||
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						!defined($origPathAttribs{$path}->{'sequence'})
					)
			) {
				printLog(LOG_ERROR,"No dbackup format/sequence information found in ".
						"'[$dest]/($path)/.dbackup-state', IGNORING\n");
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				delete($origDirList{$path});
				delete($origFileList{$path});
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			# Check if we going to upgrade...
			} else {
				# Are we doing backup upgrades?
				if ($config{'backup-upgrade'}) {
					# Pull in versions
					my $a = getNumericVer($origPathAttribs{$path}->{'dbackup.version'});
					my $b = getNumericVer($VERSION);
					# Compare
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					if (
							$a < 16		# Things before 0.0.16 may have .dbackup-state issues and missing
										# required info.
					) {
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						# Check if end in .x
						if ($VERSION =~ /\.x$/) {
							printLog(LOG_WARNING,"S: Path '[$source]/($path)' ".
									"cannot be upgraded, dbackup is TRUNK version\n");
						} else {
							printLog(LOG_INFO,"S: Path '[$source]/($path)' will be backed up, upgrading\n");
							delete($origDirList{$path});
							delete($origFileList{$path});
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							# Force state file update if dir is empty
							$doBackup{$path} |= ST_DIR_CHANGED;
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						}
					}
				}
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			}
		}

		# Apply filter...
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		if ((@{$config{'exclude-file'}}) > 0) {
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			my @newList;
			foreach my $item (@list) {
				my $match = 0;
				# Apply only to files
				if ( -f "$source/$path/$item") {
					# Loop with exclude filters
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					foreach my $filter (@{$config{'exclude-file'}}) {
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						# Check for match
						if ($item =~ $filter) {
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							printLog(LOG_INFO,"S: Path '[$source]/($path)/$item' matches file exclude filter, ignoring\n");
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							# XXX: NK - If this ws backed up before and now not, dir has changed?
							$match = 1;
							last;
						}
					}
				}
				# If not matched, add to new list
				if (!$match) {
					push(@newList,$item);
				}
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			}
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			# Replace the list now
			@list = @newList;
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		}

		return @list;
	}

	# Process files
	sub backup_process {
		my $name = $File::Find::name;
		# Strip first part of the path
		(my $path = $File::Find::dir) =~ s#^$source/?##;

		# Store current filename
		my $item = $_;

		# We use lstat so we don't follow symlinks that don't exist
		my @stat = lstat($name);
		# Split it up
		my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,
				$ctime,$blksize,$blocks) = @stat;

		# Process directory
		if (S_ISDIR($mode)) {
			# Skip over main dir
			if ($item eq ".") {
				return;
			}

			# Make sure sub dirs have a santized name
			my $ppath = ($path ne "") ? "$path/$item" : $item;

			# Set default flags to nothing...
			$doBackup{$ppath} = 0;

			# Ok, lets see whats going on with the dir
			if (!defined($origDirList{$path}->{$item})) {
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				printLog(LOG_DEBUG,"S: Directory '[$source]/($path)/$item' is new\n");
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				$doBackup{$path} |= ST_DIR_CHANGED;

			# Check if mtime matches
			} elsif (
					!defined($origDirList{$path}->{$item}->{'mtime'}) ||
					$origDirList{$path}->{$item}->{'mtime'} ne $mtime
			) {
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				printLog(LOG_DEBUG,"S: Directory '[$source]/($path)/$item' was modified\n");
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				$doBackup{$path} |= ST_DIR_CHANGED;
			# Check if uid matches
			} elsif (
					!defined($origDirList{$path}->{$item}->{'uid'}) ||
					$origDirList{$path}->{$item}->{'uid'} ne $uid
			) {
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				printLog(LOG_DEBUG,"S: Directory '[$source]/($path)/$item' UID was changed\n");
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				$doBackup{$path} |= ST_DIR_CHANGED;
			# Check if gid matches
			} elsif (
					!defined($origDirList{$path}->{$item}->{'gid'}) ||
					$origDirList{$path}->{$item}->{'gid'} ne $gid
			) {
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				printLog(LOG_DEBUG,"S: Directory '[$source]/($path)/$item' GID was changed\n");
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				$doBackup{$path} |= ST_DIR_CHANGED;
			# Check if mode matches
			} elsif (
					!defined($origDirList{$path}->{$item}->{'mode'}) ||
					$origDirList{$path}->{$item}->{'mode'} ne $mode
			) {
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				printLog(LOG_DEBUG,"S: Directory '[$source]/($path)/$item' MODE was changed\n");
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				$doBackup{$path} |= ST_DIR_CHANGED;
			}

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			# Record details...
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			$srcDirList{$path}->{$item}->{'size'} = $size;
			$srcDirList{$path}->{$item}->{'ctime'} = $ctime;
			$srcDirList{$path}->{$item}->{'atime'} = $atime;
			$srcDirList{$path}->{$item}->{'mtime'} = $mtime;
			$srcDirList{$path}->{$item}->{'uid'} = $uid;
			$srcDirList{$path}->{$item}->{'gid'} = $gid;
			$srcDirList{$path}->{$item}->{'mode'} = $mode;

			return;
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		# Check if we're a socket
		} elsif (S_ISSOCK($mode)) {
			# Blatently ignore...
			return;
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		}

		# Initialize file state
		my $state = 0;

		# Check if file does not exists on backup
		if (!defined($origFileList{$path}->{$item})) {
			if (($doBackup{$path} & ST_DIR_NEW) != ST_DIR_NEW) {
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				printLog(LOG_DEBUG,"S: File '[$source]/($path)/$item' is new\n");
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			}
			$state |= ST_FILE_NEW;

		# Check if size matches
		} elsif (
				!defined($origFileList{$path}->{$item}->{'size'}) ||
				$origFileList{$path}->{$item}->{'size'} ne $size
		) {
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			printLog(LOG_DEBUG,"S: File '[$source]/($path)/$item' has different size\n");
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			$state |= ST_FILE_CHANGED;

		#
		# NK: Does not like chmod changes to files???
		#
		# Check if ctime matches
#		} elsif (
#				!defined($origFileList{$path}->{$item}->{'ctime'}) ||
#				$origFileList{$path}->{$item}->{'ctime'} ne $ctime
#		) {
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#			printLog(LOG_DEBUG,"S: File '[$source]/($path)/$item' was recreated\n");
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#			$state |= ST_FILE_CHANGED;

		# Check if mtime matches
		} elsif (
				!defined($origFileList{$path}->{$item}->{'mtime'}) ||
				$origFileList{$path}->{$item}->{'mtime'} ne $mtime
		) {
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			printLog(LOG_DEBUG,"S: File '[$source]/($path)/$item' was modified\n");
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			$state |= ST_FILE_CHANGED;

		# Check if uid matches
		} elsif (
				!defined($origFileList{$path}->{$item}->{'uid'}) ||
				$origFileList{$path}->{$item}->{'uid'} ne $uid
		) {
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			printLog(LOG_DEBUG,"S: File '[$source]/($path)/$item' UID was changed\n");
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			$state |= ST_FILE_ATTR_CHANGED

		# Check if gid matches
		} elsif (
				!defined($origFileList{$path}->{$item}->{'gid'}) ||
				$origFileList{$path}->{$item}->{'gid'} ne $gid
		) {
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			printLog(LOG_DEBUG,"S: File '[$source]/($path)/$item' GID was changed\n");
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			$state |= ST_FILE_ATTR_CHANGED;

		# Check if mode matches
		} elsif (
				!defined($origFileList{$path}->{$item}->{'mode'}) ||
				$origFileList{$path}->{$item}->{'mode'} ne $mode
		) {
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			printLog(LOG_DEBUG,"S: File '[$source]/($path)/$item' MODE was changed\n");
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			$state |= ST_FILE_ATTR_CHANGED;
		}

		# Update state of path, this is used below, the $state is used to track WHAT changed
		if ($state) {
			$doBackup{$path} |= ST_FILE_CHANGED;
		}

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		# Record details...
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		$srcFileList{$path}->{$item}->{'size'} = $size;
		$srcFileList{$path}->{$item}->{'ctime'} = $ctime;
		$srcFileList{$path}->{$item}->{'atime'} = $atime;
		$srcFileList{$path}->{$item}->{'mtime'} = $mtime;
		$srcFileList{$path}->{$item}->{'uid'} = $uid;
		$srcFileList{$path}->{$item}->{'gid'} = $gid;
		$srcFileList{$path}->{$item}->{'mode'} = $mode;
		$srcFileList{$path}->{$item}->{'_state'} = $state;
	}


	# Time to do stuff
	sub backup_postprocess {
		# Strip first part of the path
		(my $path = $File::Find::dir) =~ s#^$source/?##;
		# Get current lists
		my $curDirList = $srcDirList{$path};
		my $curFileList = $srcFileList{$path};

		# Compare the two file lists, we know what was added, lets see if anything was removed
		foreach my $fname (keys %{$origFileList{$path}}) {
			if (!defined($srcFileList{$path}->{$fname})) {
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				printLog(LOG_DEBUG,"File '[$source]/($path)/$fname' removed\n");
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				$doBackup{$path} |= ST_FILE_CHANGED;
			}
		}

		# Create backup dir
		if (($doBackup{$path} & ST_DIR_NEW) == ST_DIR_NEW && ! -d "$dest/$path") {
			mkpath("$dest/$path");
		}

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		# NK:
		# Before we do anything, we copy our previous attributes.
		# If we do not write an archive below, we still have our stuff.
		# If there is something special, we still have it. Best idea? right?
		foreach my $item (keys %{$origPathAttribs{$path}}) {
			$newPathAttribs{$path}->{$item} = $origPathAttribs{$path}->{$item};
		}

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		# Check if we need to backup this dir
		if (($doBackup{$path} & ST_FILE_CHANGED) == ST_FILE_CHANGED) {
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			printLog(LOG_INFO,"B: Path '[$source]/$path' backing up\n");
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			# If we not backing up a system dir, we create a manifest and backup the files
			if (($doBackup{$path} & ST_DIR_SYS) != ST_DIR_SYS) {
				# Did file contents change?
				my $changedFiles = 0;
				my $changedAttrs = 0;
				my @newFiles = ();
				my @manifestList;

				# Take a look quick...
				foreach my $item (sort keys %{$curFileList}) {
					# Lets see whats happened...
					if (($curFileList->{$item}->{'_state'} & ST_FILE_NEW) == ST_FILE_NEW) {
						push(@newFiles,$item);
					}
					if (($curFileList->{$item}->{'_state'} & ST_FILE_CHANGED) == ST_FILE_CHANGED) {
						$changedFiles = 1;
					}
					if (($curFileList->{$item}->{'_state'} & ST_FILE_ATTR_CHANGED) == ST_FILE_ATTR_CHANGED) {
						$changedAttrs = 1;
					}
				}

				# If we don't have a sequence, this is a new backup?
				if (!defined($newPathAttribs{$path}->{'sequence'} = $origPathAttribs{$path}->{'sequence'})) {
					$newPathAttribs{$path}->{'sequence'} = 0;
					@manifestList = keys %{$curFileList};
				} else {
					# If this is new files, then just inc the counter
					if (@newFiles > 0 && !$changedFiles && !$changedAttrs) {
						$newPathAttribs{$path}->{'sequence'}++;
						@manifestList = @newFiles;
					# If files changed we blow everything away
					} else {
						$newPathAttribs{$path}->{'sequence'} = 0;
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						# Remove old files
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						removeBackups(
								"$dest/$path",
								$origPathAttribs{$path}->{'format'},
								$origPathAttribs{$path}->{'compression'},
								$origPathAttribs{$path}->{'sequence'}
						);
						@manifestList = keys %{$curFileList};
					}
				}


				# Get current sequence
				my $seq = $newPathAttribs{$path}->{'sequence'};

				# Setup tar args
				my @tarArgs = ();
				my $tarExt;
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				if ($config{'compress'} eq "xz") {
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					push(@tarArgs,"--use-compress-program",$config{'compress-xz'});
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					$tarExt = ".xz";
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				} elsif ($config{'compress'} eq "bzip2") {
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					push(@tarArgs,"--use-compress-program",$config{'compress-bzip2'});
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					$tarExt = ".bz2";
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				} elsif ($config{'compress'} eq "gzip") {
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					push(@tarArgs,"--use-compress-program",$config{'compress-gzip'});
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					$tarExt = ".gz";
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				} elsif ($config{'compress'} eq "lz") {
					push(@tarArgs,"--use-compress-program",$config{'compress-lz'});
					$tarExt = ".lz";
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				} elsif ($config{'compress'} eq "none") {
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					$tarExt = "";
				}

				# Save format and compression
				$newPathAttribs{$path}->{'format'} = "tar";
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				$newPathAttribs{$path}->{'compression'} = $config{'compress'};
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				# Sort out manifest format
				my $manifestDelim;
				# Are we overriding the manifest format?
				if (defined($config{'manifest-format'})) {
					$newPathAttribs{$path}->{'manifest.format'} = $config{'manifest-format'};
				} else {
					# If not choose best
					if (defined($origPathAttribs{$path}->{'manifest.format'})) {
						$newPathAttribs{$path}->{'manifest.format'} = $origPathAttribs{$path}->{'manifest.format'};
					} else {
						# Tar pre-1.22 is buggered with \0 manifest files
						if ($tarVer > 122) {
							$newPathAttribs{$path}->{'manifest.format'} = "null";
						} else {
							$newPathAttribs{$path}->{'manifest.format'} = "newline";
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						}
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					}
				}

				# Setup manifest delim & tar options
				if ($newPathAttribs{$path}->{'manifest.format'} eq "null") {
					push(@tarArgs,"--null");
					push(@tarArgs,"--files-from", "$dest/$path/dbackup$seq.manifest");
					push(@tarArgs,"--no-unquote");
					$manifestDelim = "\0";
				} elsif ($newPathAttribs{$path}->{'manifest.format'} eq "newline") {
					push(@tarArgs,"--files-from", "$dest/$path/dbackup$seq.manifest");
					$manifestDelim = "\n";
				} else {
					printLog(LOG_ERROR,"Invalid manifest.format '".$newPathAttribs{$path}->{'manifest.format'}."'\n");
					exit 1;
				}

				# File list to backup
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				open(my $fh,">","$dest/$path/dbackup$seq.manifest")
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						or die "Failed to open '[$dest]/($path)/dbackup$seq.manifest': $!";
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				foreach my $item (@manifestList) {
					# Sanity check to see if this filename is going to work
					if ($manifestDelim eq "\n" && $item =~ /[\n"'\\]/) {
						printLog(LOG_ERROR,"ERROR: Your version of tar cannot backup => path:'$path', file '$item'\n");
						next;
					}
					# If this is not the top dir, use /
					if ($path ne "") {
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						print($fh "$path/$item$manifestDelim");
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					# If it is, don't use /
					} else {
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						print($fh "$item$manifestDelim");
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					}
				}
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				close($fh);
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				# tar specifics...
				if ($newPathAttribs{$path}->{'format'} eq "tar") {
					# Exclude paths for tar-ignore-failed-read
					foreach my $item (@{$config{'tar-ignore-failed-read'}}) {
						# Check...
						if ("/$path" eq $item) {
							printLog(LOG_NOTICE,"B: Path '[$source]/$path' ignore-failed-read passed to tar\n");
							push(@tarArgs,"--ignore-failed-read",$path);
						}
					}
				}

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				# Change dir and start backup
				system(
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					"tar",
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					"--create",
					"--verbose",
					# Output file
					"--file", "$dest/$path/dbackup$seq.tar$tarExt",
					# cd into here first...
					"--directory", "$source",
					# Do not recurse
					"--no-recursion",
					# Output to this file
					"--index-file", "$dest/$path/dbackup$seq.index",
					# Incremental options
#					"--listed-incremental", "$dest/$path/dbackup.snar",
#					"--no-check-device",
					@tarArgs
				);
				if ($? == -1) {
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					printLog(LOG_ERROR,"Failed to execute: $!\n");
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					exit 1;
				} elsif ($? & 127) {
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					printLog(LOG_ERROR,"Child died with signal ".($? & 127)."\n");
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					exit 1;
				} else {
					my $retcode = $? >> 8;
					# If tar died, lets die too
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					if ($retcode >= 2) {
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						printLog(LOG_ERROR,"tar died with error code $retcode\n");
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#						exit 1;
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					}
				}
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			} else { # if (($doBackup{$path} & ST_DIR_SYS) != ST_DIR_SYS) {
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					# Remove old files
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					removeBackups(
							"$dest/$path",
							$origPathAttribs{$path}->{'format'},
							$origPathAttribs{$path}->{'compression'},
							$origPathAttribs{$path}->{'sequence'}
					);
			}
		} # if (($doBackup{$path} & ST_FILE_CHANGED) == ST_FILE_CHANGED) {


		# Check if we need to record directory changes...
		if (
					($doBackup{$path} & ST_FILE_CHANGED) == ST_FILE_CHANGED ||
					($doBackup{$path} & ST_DIR_CHANGED) == ST_DIR_CHANGED ||
					($doBackup{$path} & ST_DIR_NEW) == ST_DIR_NEW
		) {
			# If we have a revision, bump it
			if (defined($newPathAttribs{$path}->{'revision'} = $origPathAttribs{$path}->{'revision'})) {
				$newPathAttribs{$path}->{'revision'} = $origPathAttribs{$path}->{'revision'} + 1;
			} else {
				$newPathAttribs{$path}->{'revision'} = 0;
			}

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			# Set this as the dbackup that created this file
			$newPathAttribs{$path}->{'dbackup.version'} = $VERSION;

			printLog(LOG_DEBUG,"B: Writing state '[$source]/($path)' - revision ".$newPathAttribs{$path}->{'revision'}."\n");
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			# Write out state, we do this AFTER we have backed up, so if we stopped, we can just  continue
			my $gz = gzopen("$dest/$path/.dbackup-state","wb")
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					or die "Failed to open '[$dest]/($path)/.dbackup-state': $!";
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			# Loop with attributes
			foreach my $item (keys %{$newPathAttribs{$path}}) {
				$gz->gzwrite(join("\0",
						"a",
						$item,
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						$newPathAttribs{$path}->{$item}
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					)."\n"
				);
			}
			# Loop with directory list
			foreach my $item (sort keys %{$curDirList}) {
				my $ename = encode_base64($item);
				$ename =~ s/\n//g;
				# Save state of source files
				$gz->gzwrite(join("\0",
						"d",
						$ename,
						$curDirList->{$item}->{'ctime'},
						$curDirList->{$item}->{'atime'},
						$curDirList->{$item}->{'mtime'},
						$curDirList->{$item}->{'uid'},
						$curDirList->{$item}->{'gid'},
						$curDirList->{$item}->{'mode'}
					)."\n"
				);
			}
			# Loop with file list
			foreach my $item (sort keys %{$curFileList}) {
				my $ename = encode_base64($item);
				$ename =~ s/\n//g;
				# Save state of source files
				$gz->gzwrite(join("\0",
						"f",
						$ename,
						$curFileList->{$item}->{'size'},
						$curFileList->{$item}->{'ctime'},
						$curFileList->{$item}->{'atime'},
						$curFileList->{$item}->{'mtime'},
						$curFileList->{$item}->{'uid'},
						$curFileList->{$item}->{'gid'},
						$curFileList->{$item}->{'mode'}
					)."\n"
				);
			}
			# Finally close
			$gz->gzclose();
		}

		# State clear
		delete($origFileList{$path});
	}

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	printLog(LOG_NOTICE,"BACKUP START: $source => $dest\n");
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	printLog(LOG_INFO,"Compression: ".$config{'compress'}." [".$config{'compress-'.$config{'compress'}}."]\n");
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	# Should we output the system base dirs? we do if we excluding anything
	if ($config{'exclude-system'} || $config{'exclude-data'}) {
		printLog(LOG_NOTICE,"Exclude System Base: ".join(", ",@{$config{'system-base'}})."\n");
	}
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	# Check if we excluding system files
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	if ($config{'exclude-system'}) {
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		printLog(LOG_NOTICE,"Exclude System Dirs: ".join(", ",@defaultSystemExcl,@{$config{'system-dir'}})."\n");
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	}
	# If we excluding data too...
	if ($config{'exclude-data'}) {
		printLog(LOG_NOTICE,"Exclude Data Dirs: ".join(", ",@defaultDataExcl,@{$config{'data-dir'}})."\n");
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	}
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	printLog(LOG_NOTICE,"Exclude Paths: ".join(", ",@{$config{'exclude-path'}})."\n");
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	printLog(LOG_NOTICE,"Exclude Files: ".join(", ",@{$config{'exclude-file'}})."\n");
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	# We need an entry for our main dir before we start
	$doBackup{""} = 0;

	# This basically does our backup for us...
	find (
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		{
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			preprocess => \&backup_preprocess,
			wanted => \&backup_process,
			postprocess => \&backup_postprocess
		},
		$source
	);


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	printLog(LOG_INFO,"Processing stale directories...\n");
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	my @rmlist;
	# Total item by item
	find (
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		{
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			wanted => sub { },
			# We just need post processing ...
			postprocess => sub {
				# Strip first part of the path
				(my $path = $File::Find::dir) =~ s#^$dest/?##;
				# Does this dir exist on the backup, but not on the fileserver?
				if (!defined($srcFileList{$path})) {
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					push(@rmlist,$path);
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				}
			},
		},
		$dest
	);
	foreach my $rmitem ( @rmlist ) {
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		printLog(LOG_DEBUG,"Remove path '[$dest]/($rmitem)'\n");
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		rmtree("$dest/$rmitem");
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	}

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	printLog(LOG_NOTICE,"BACKUP END\n");
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}


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# Restore function
sub restore
{
	our ($source,$dest) = @_;

	# State infor for current dir
	our %origFileList;
	our %origDirList;
	our %origPathAttribs;


	# Preprocess dir
	sub restore_preprocess {
		my @list = @_;

		# Strip first part of the path
		(my $path = $File::Find::dir) =~ s#^$source/?##;

		# Check if we have all our source files
		if ( ! -f "$source/$path/.dbackup-state" ) {
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			printLog(LOG_WARNING,"S: Path '[$source]/($path)' is MISSING .dbackup-state\n");
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			return @list;
		}

		# Load state file
		loadStateFile("$source/$path/.dbackup-state",$path,\%origFileList,\%origDirList,\%origPathAttribs);

		# Check we have at least the version attribute
		if (!defined($origPathAttribs{$path}) || !defined($origPathAttribs{$path}->{'dbackup.version'})) {
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			printLog(LOG_ERROR, "No dbackup version information found in '[$source]/($path)/.dbackup-state', IGNORING\n");
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			delete($origDirList{$path});
			delete($origFileList{$path});
			return @list;
		}

		# During our check, we need to create the dir, we may not have a backup file
		# so we do it here.
		if ( ! -d "$dest/$path") {
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			printLog(LOG_INFO,"R: Path '[$dest]/($path)' creating directory\n");
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			mkpath("$dest/$path");
		}

		# The lack of a sequence number probably means we didn't output any tar files during backup
		if (!defined($origPathAttribs{$path}->{'sequence'})) {
			return @list;
		}

		# Loop through backup sequences
		for (my $seq = 0; $seq <= $origPathAttribs{$path}->{'sequence'}; $seq++) {
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			printLog(LOG_DEBUG,"R: Path '[$dest]/($path)' restoring data ".($seq+1)." of ".
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					($origPathAttribs{$path}->{'sequence'}+1)."\n");

			# Args for tar
			my @tarArgs = ();

			my $tarExt;
			if ($origPathAttribs{$path}->{'compression'} eq "xz") {
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				push(@tarArgs,"--use-compress-program",$config{'compress-xz'});
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				$tarExt = ".xz";
			} elsif ($origPathAttribs{$path}->{'compression'} eq "bzip2") {
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				push(@tarArgs,"--use-compress-program",$config{'compress-bzip2'});
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				$tarExt = ".bz2";
			} elsif ($origPathAttribs{$path}->{'compression'} eq "gzip") {
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				push(@tarArgs,"--use-compress-program",$config{'compress-gzip'});
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				$tarExt = ".gz";
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			} elsif ($origPathAttribs{$path}->{'compression'} eq "lz") {
				push(@tarArgs,"--use-compress-program",$config{'compress-lz'});
				$tarExt = ".lz";
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			} elsif ($origPathAttribs{$path}->{'compression'} eq "none") {
				$tarExt = "";
			}

			# Check what type of backup we did
			if ( ! -f "$source/$path/dbackup$seq.tar$tarExt" ) {
				# If we have any other part of the backup, show a message
				if (
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							( -f "$source/$path/dbackup$seq.index" ||
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							-f "$source/$path/dbackup$seq.manifest" ||
							-f "$source/$path/dbackup$seq.snar" ) && $seq > 0
				) {
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					printLog(LOG_WARNING,"Backup file '[$source]/($path)/dbackup$seq.tar$tarExt' not found, IGNORING\n");
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				}

				return @list;
			}

			# Check we have files we need/created
			if ( ! -f "$source/$path/dbackup$seq.index" ) {
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				printLog(LOG_WARNING,"Manifest file '[$source]/($path)/dbackup$seq.index' not found\n");
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				return @list;
			}
			if ( ! -f "$source/$path/dbackup$seq.manifest" ) {
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				printLog(LOG_WARNING,"Manifest file '[$source]/($path)/dbackup$seq.manifest' not found\n");
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				return @list;
			}

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			# Check if manifest.format is undefined, if it is, use the default
			if (!defined($origPathAttribs{$path}->{'manifest.format'})) {
				# Check if we have a commandline override
				if (defined($optctl{'manifest-format'})) {
					$origPathAttribs{$path}->{'manifest.format'} = $optctl{'manifest-format'};
				} else {
					# NK:
					# Default to null
					# This saves us from having to regenerate manifest.format attrs and backups for older
					# versions of dbackup.
					$origPathAttribs{$path}->{'manifest.format'} = "null";
				}
			}

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			# Setup manifest delim & tar options
			if ($origPathAttribs{$path}->{'manifest.format'} eq "null") {
				push(@tarArgs,"--null");
				push(@tarArgs,"--files-from", "$source/$path/dbackup$seq.manifest");
				push(@tarArgs,"--no-unquote");
			} elsif ($origPathAttribs{$path}->{'manifest.format'} eq "newline") {
				push(@tarArgs,"--files-from", "$source/$path/dbackup$seq.manifest");
			} else {
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				printLog(LOG_ERROR,"Invalid manifest.format '".$origPathAttribs{$path}->{'manifest.format'}.
						"' for '[$source]/($path)', try setting the default with --manifest-format=\n");
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				exit 1;
			}

			# Sanity check
			if ($tarVer < 122 && $origPathAttribs{$path}->{'manifest.format'} eq "null") {
				printLog(LOG_ERROR,"Your version of tar does NOT support manifest.format of 'null'\n");
				exit 1;
			}

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			# Other tar options
			if (defined($optctl{'tar-keep-newer'})) {
				push(@tarArgs,"--keep-newer-files");
			}
			if (defined($optctl{'tar-keep-old-files'})) {
				push(@tarArgs,"--keep-old-files");
			}

			# Change dir and start backup
			system(
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				"tar",
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				"--extract",
				# Output file
				"--file", "$source/$path/dbackup$seq.tar$tarExt",
				# cd into here first...
				"--directory", "$dest",
				# Do not recurse
				"--no-recursion",
				# Incremental options
#			"--incremental",
				@tarArgs
			);
			if ($? == -1) {
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				printLog(LOG_ERROR,"Failed to execute: $!\n");
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				exit 1;
			} elsif ($? & 127) {
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				printLog(LOG_ERROR,"Child died with signal ".($? & 127)."\n");
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				exit 1;
			} else {
				my $retcode = $? >> 8;
				# If tar died, lets die too
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				if ($retcode >= 2) {
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					printLog(LOG_ERROR,"tar died with error code $retcode\n");
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#					exit 1;
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				}
			}
		}

		return @list;
	}

	# Process files
	sub restore_process {
		my $name = $File::Find::name;
		# Strip first part of the path
		(my $path = $File::Find::dir) =~ s#^$source/?##;

		# Store current filename
		my $item = $_;

#		print(STDERR "PROCESS: Path = $path, Name = $name, Item = $item)\n");
	}


	# Time to do stuff
	sub restore_postprocess {
		# Strip first part of the path
		(my $path = $File::Find::dir) =~ s#^$source/?##;

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		printLog(LOG_DEBUG,"R: Path '[$dest]/($path)' restoring meta-data\n");
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		# Loop with directories in this path
		foreach my $dname (keys %{$origDirList{$path}}) {
			# Set dir
			my $dir = $origDirList{$path}->{$dname};

			# Full dirname
			my $fdirname = "$dest/$path/$dname";

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			# Could be a dir with no contents of one which was ignored, in which case we must create it
			if (! -d $fdirname) {
				printLog(LOG_INFO,"R: Path '[$dest]/($path)/$dname' creating missing directory\n");
				mkpath($fdirname);
			}

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			# Restore attribs
			if (!chown($dir->{'uid'},$dir->{'gid'},$fdirname)) {
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				printLog(LOG_ERROR,"Failed to chown(".$dir->{'uid'}.",".$dir->{'gid'}.") '$fdirname': $!\n");
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			}
			if (!chmod($dir->{'mode'},$fdirname)) {
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				printLog(LOG_ERROR,"Failed to chmod(".$dir->{'mode'}.") '$fdirname': $!\n");
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			}
			if (!utime($dir->{'atime'},$dir->{'mtime'},$fdirname)) {
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				printLog(LOG_ERROR,"Failed to utime(".$dir->{'atime'}.",".$dir->{'mtime'}.") '$fdirname': $!\n");
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			}
		}

		# Loop with files in this path
		foreach my $fname (keys %{$origFileList{$path}}) {
			# Set dir
			my $file = $origFileList{$path}->{$fname};

			# Full dirname
			my $ffilename = "$dest/$path/$fname";

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			# Restore for links and files
			if (!lchown($file->{'uid'},$file->{'gid'},$ffilename)) {
				printLog(LOG_ERROR,"Failed to lchown(".$file->{'uid'}.",".$file->{'gid'}.") '$ffilename': $!\n");
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			}
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			# Ignore links for the rest...
			next if (S_ISLNK($file->{'mode'}));

			# Restore mode & utime only for files
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			if (!chmod($file->{'mode'},$ffilename)) {
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				printLog(LOG_ERROR,"Failed to chmod(".$file->{'mode'}.") '$ffilename': $!\n");
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			}
			if (!utime($file->{'atime'},$file->{'mtime'},$ffilename)) {
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				printLog(LOG_ERROR,"Failed to utime(".$file->{'atime'}.",".$file->{'mtime'}.") '$ffilename': $!\n");
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			}
		}
	}

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	printLog(LOG_NOTICE,"RESTORE START: $source => $dest\n");
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	# This basically does our backup for us...
	find (
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		{
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			preprocess => \&restore_preprocess,
			wanted => \&restore_process,
			postprocess => \&restore_postprocess
		},
		$source
	);

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	printLog(LOG_NOTICE,"RESTORE END\n");
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}


# Display log line
sub printLog {
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	my ($level,$msg,@args) = @_;


	# Work out level txt all nicely
	my $levelTxt = "UNKNOWN";
	if ($level == LOG_DEBUG) {
		$levelTxt = "DEBUG";
	} elsif ($level == LOG_INFO) {
		$levelTxt = "INFO";
	} elsif ($level == LOG_NOTICE) {
		$levelTxt = "NOTICE";
	} elsif ($level == LOG_WARNING) {
		$levelTxt = "WARNING";
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	} elsif ($level == LOG_ERROR) {
		$levelTxt = "ERROR";
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	}
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	# Check log level
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	if ($level <= $config{'log-level'}) {
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		printf(STDERR "%s/$levelTxt: %s", strftime('%F %T',localtime()), $msg, @args);
	}
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}



# Display usage
sub displayHelp {
	# Build some strings we need
	my $systemDirStr = join (", ",@defaultSystemExcl);
	my $dataDirStr = join (", ",@defaultDataExcl);

	print(STDERR<<EOF);
Usage: $0 [args] <src> <dst>

    General Options:
      --help                             What you seeing now.
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      --config=file                      Config file to use.
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      --log-level                        5 = debug, 4 = info, 3 = notice
                                         2 = warning, 1 = error
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      --tar                              Path to tar binary.
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