#!/usr/bin/perl

my $PROGNAME = "pve-zsync";
my $CONFIG_PATH = '/var/lib/'.$PROGNAME.'/';
my $CONFIG = "$PROGNAME.cfg";
my $CRONJOBS = '/etc/cron.d/'.$PROGNAME;
my $VMCONFIG = '/var/lib/'.$PROGNAME.'/';
my $PATH = "/usr/sbin/";
my $QEMU_CONF = '/etc/pve/local/qemu-server/';
my $DEBUG = 0;

use strict;
use warnings;
use Data::Dumper qw(Dumper);
use Fcntl qw(:flock SEEK_END);
use Getopt::Long;
use Switch;

check_bin ('cstream');
check_bin ('zfs');
check_bin ('ssh');
check_bin ('scp');

sub check_bin {
    my ($bin)  = @_;

    foreach my $p (split (/:/, $ENV{PATH})) {
        my $fn = "$p/$bin";
        if (-x $fn) {
            return $fn;
	}
    }

    warn "unable to find command '$bin'\n";
}

sub cut_to_width {
    my ($text, $max) = @_;

    return  $text if (length($text) <= $max);
    my @spl = split('/', $text);

    my $count = length($spl[@spl-1]);
    return "..\/".substr($spl[@spl-1],($count-$max)+3 ,$count) if $count > $max;

    $count +=  length($spl[0]) if @spl > 1;
    return substr($spl[0], 0, $max-4-length($spl[@spl-1]))."\/..\/".$spl[@spl-1] if $count > $max;

    my $rest = 1 ;
    $rest = $max-$count if ($max-$count > 0);

    return "$spl[0]".substr($text, length($spl[0]), $rest)."..\/".$spl[@spl-1];
}

sub lock {
    my ($fh) = @_;
    flock($fh, LOCK_EX) or die "Cannot lock config - $!\n";

    seek($fh, 0, SEEK_END) or die "Cannot seek - $!\n";
}

sub unlock {
    my ($fh) = @_;
    flock($fh, LOCK_UN) or die "Cannot unlock config- $!\n";
}

sub check_config {
    my ($source, $name, $cfg) = @_;

    my $id = $source->{vmid} ? $source->{vmid} : $source->{abs_path};
    my $status = $cfg->{$id}->{$name}->{status};

    if ($cfg->{$id}->{$name}->{status}){
	return $status;
    }

    return undef;
}


sub check_pool_exsits {
    my ($pool, $ip) = @_;

    my $cmd = '';
    $cmd = "ssh root\@$ip " if $ip;
    $cmd .= "zfs list $pool -H";
    eval {
	run_cmd($cmd);
    };

    if($@){
	return 1;
    }
    return undef;
}

sub write_to_config {
    my ($cfg) = @_;

    open(my $fh, ">", "$CONFIG_PATH$CONFIG")
	or die "cannot open >$CONFIG_PATH$CONFIG: $!\n";

    my $text = decode_config($cfg);

    print($fh $text);

    close($fh);
}

sub read_from_config {

    unless(-e "$CONFIG_PATH$CONFIG") {
	return undef;
    }

    open(my $fh, "<", "$CONFIG_PATH$CONFIG")
	or die "cannot open > $CONFIG_PATH$CONFIG: $!\n";

    $/ = undef;

    my $text = <$fh>;

    unlock($fh);

    close($fh);

    my $cfg = encode_config($text);

    return $cfg;
}

sub decode_config {
    my ($cfg) = @_;
    my $raw = '';
    foreach my $source (sort keys%{$cfg}){
	foreach my $sync_name (sort keys%{$cfg->{$source}}){
	    $raw .= "$source: $sync_name\n";
		foreach my $parameter (sort keys%{$cfg->{$source}->{$sync_name}}){
		    $raw .= "\t$parameter: $cfg->{$source}->{$sync_name}->{$parameter}\n";
		}
	}
    }
    return $raw;
}

sub encode_config {
    my ($raw) = @_;
    my $cfg = {};
    my $source;
    my $check = 0;
    my $sync_name;

    while ($raw && $raw =~ s/^(.*?)(\n|$)//) {
	my $line = $1;

	next if $line =~ m/^\#/;
	next if $line =~ m/^\s*$/;

	if ($line =~ m/^(\t| )(\w+): (.+)/){
	    my $par = $2;
	    my $value = $3;

	    if ($par eq 'source_pool') {
		$cfg->{$source}->{$sync_name}->{$par} = $value;
		die "error in Config: SourcePool value doubled\n" if ($check & 1);
		$check += 1;
	    } elsif ($par eq 'source_ip') {
		$cfg->{$source}->{$sync_name}->{$par} = $value;
		die "error in Config: SourceIP value doubled\n" if ($check & 2);
		$check += 2;
	    } elsif ($par eq 'status') {
		$cfg->{$source}->{$sync_name}->{$par} = $value;
		die "error in Config: Status value doubled\n" if ($check & 4);
		$check += 4;
	    } elsif ($par eq 'method') {
		$cfg -> {$source}->{$sync_name}->{$par} = $value;
		die "error in Config: Method value doubled\n" if ($check & 8);
		$check += 8;
	    } elsif ($par eq 'interval') {
		$cfg -> {$source}->{$sync_name}->{$par} = $value;
		die "error in Config: Iterval value doubled\n" if ($check & 16);
		$check += 16;
	    } elsif ($par eq 'limit') {
		$cfg -> {$source}->{$sync_name}->{$par} = $value;
		die "error in Config: Limit value doubled\n" if ($check & 32);
		$check += 32;
	    } elsif ($par eq 'dest_pool') {
		$cfg -> {$source}->{$sync_name}->{$par} = $value;
		die "error in Config: DestPool value doubled\n" if ($check & 64);
		$check += 64;
	    } elsif ($par eq 'dest_ip') {
		$cfg -> {$source}->{$sync_name}->{$par} = $value;
		die "error in Config: DestIp value doubled\n" if ($check & 128);
		$check += 128;
	    } elsif ($par eq 'dest_path') {
		$cfg -> {$source}->{$sync_name}->{$par} = $value;
		die "error in Config: DestPath value doubled\n" if ($check & 256);
		$check += 256;
	    } elsif ($par eq 'source_path') {
		$cfg -> {$source}->{$sync_name}->{$par} = $value;
		die "error in Config: SourcePath value doubled\n" if ($check & 512);
		$check += 512;
	    } elsif ($par eq 'vmid') {
		$cfg -> {$source}->{$sync_name}->{$par} = $value;
		die "error in Config: Vmid value doubled\n" if ($check & 1024);
		$check += 1024;
	    } elsif ($par =~ 'lsync') {
		$cfg->{$source}->{$sync_name}->{$par} = $value;
		die "error in Config: lsync value doubled\n" if ($check & 2048);
		$check += 2048;
	    } elsif ($par =~ 'maxsnap') {
		$cfg->{$source}->{$sync_name}->{$par} = $value;
		die "error in Config: maxsnap value doubled\n" if ($check & 4096);
		$check += 4096;
	    } else {
		die "error in Config\n";
	    }
	} elsif ($line =~ m/^((\d+.\d+.\d+.\d+):)?([\w\-\_\/]+): (.+){0,1}/){
	    $source = $3;
	    $sync_name = $4 ? $4 : 'default' ;
	    $cfg->{$source}->{$sync_name} = undef;
	    $cfg->{$source}->{$sync_name}->{source_ip} = $2 if $2;
	    $check = 0;
	}
    }
    return $cfg;
}

sub parse_target {
    my ($text) = @_;

    if ($text =~ m/^((\d+.\d+.\d+.\d+):)?((\w+)\/?)([\w\/\-\_]*)?$/) {

	die "Input not valid\n" if !$3;
	my $tmp = $3;
	my $target = {};

	if ($2) {
	    $target->{ip} = $2 ;
	}

	if ($tmp =~ m/^(\d\d\d+)$/){
	    $target->{vmid} = $tmp;
	} else {
	    $target->{pool} = $4;
	    my $abs_path = $4;
	    if ($5) {
		$target->{path} = "\/$5";
		$abs_path .= "\/$5";
	    }
	    $target->{abs_path} = $abs_path;
	}

	return $target;
    }
    die "Input not valid\n";
}

sub list {

    my $cfg = read_from_config("$CONFIG_PATH$CONFIG");

    my $list = sprintf("%-25s%-15s%-7s%-20s%-10s%-5s\n" , "SOURCE", "NAME", "ACTIVE", "LAST SYNC", "INTERVAL", "TYPE");

    foreach my $source (sort keys%{$cfg}){
	foreach my $sync_name (sort keys%{$cfg->{$source}}){
	    my $source_name = $source;
	    $source_name = $cfg->{$source}->{$sync_name}->{source_ip}.":".$source if $cfg->{$source}->{$sync_name}->{source_ip};
	    $list .= sprintf("%-25s%-15s", cut_to_width($source_name,25), cut_to_width($sync_name,15));
	    
	    my $active = "";
	    if($cfg->{$source}->{$sync_name}->{status} eq 'syncing'){
		$active = "yes";
	    } else {
		$active = "no";
	    }
 
	    $list .= sprintf("%-7s", $active);
	    $list .= sprintf("%-20s",$cfg->{$source}->{$sync_name}->{lsync});
	    $list .= sprintf("%-10s",$cfg->{$source}->{$sync_name}->{interval});
	    $list .= sprintf("%-5s\n",$cfg->{$source}->{$sync_name}->{method});
	}
    }

    return $list;
}

sub vm_exists {
    my ($target) = @_;

    my $cmd = "";
    $cmd = "ssh root\@$target->{ip} " if ($target->{ip});
    $cmd .= "qm status $target->{vmid}";

    my $res = run_cmd($cmd);

    return 1 if ($res =~ m/^status.*$/);
    return undef;
}

sub init {
    my ($param) = @_;

    my $cfg = read_from_config;

    my $vm = {};

    my $name =  $param->{name} ? $param->{name} : "default";
    my $interval = $param->{interval} ? $param->{interval} : 15;

    my $source = parse_target($param->{source});
    my $dest = parse_target($param->{dest});

    $vm->{$name}->{dest_pool} = $dest->{pool};
    $vm->{$name}->{dest_ip} = $dest->{ip} if $dest->{ip};
    $vm->{$name}->{dest_path} = $dest->{path} if $dest->{path};

    $param->{method} = "local" if !$dest->{ip} && !$source->{ip};
    $vm->{$name}->{status} = "ok";
    $vm->{$name}->{interval} = $interval;
    $vm->{$name}->{method} = $param->{method} ? $param->{method} : "ssh";
    $vm->{$name}->{limit} = $param->{limit} if $param->{limit};
    $vm->{$name}->{maxsnap} = $param->{maxsnap} if $param->{maxsnap};

    if ( my $ip =  $vm->{$name}->{dest_ip} ) {
	run_cmd("ssh-copy-id -i /root/.ssh/id_rsa.pub root\@$ip");
    }

    if ( my $ip =  $source->{ip} ) {
	run_cmd("ssh-copy-id -i /root/.ssh/id_rsa.pub root\@$ip");
    }

    die "Pool $dest->{abs_path} does not exists\n" if check_pool_exsits($dest->{abs_path}, $dest->{ip});

    my $check = check_pool_exsits($source->{abs_path}, $source->{ip}) if !$source->{vmid} && $source->{abs_path};

    die "Pool $source->{abs_path} does not exists\n" if undef($check);

    my $add_job = sub {
	my ($vm, $name) = @_;
	my $source = "";

	if ($vm->{$name}->{vmid}) {
	    $source = "$vm->{$name}->{source_ip}:" if $vm->{$name}->{source_ip};
	    $source .= $vm->{$name}->{vmid};
	} else {
	    $source = $vm->{$name}->{source_pool};
	    $source .= $vm->{$name}->{source_path} if $vm->{$name}->{source_path};
	}
	die "Config already exists\n" if $cfg->{$source}->{$name};

	cron_add($vm);

	$cfg->{$source}->{$name} = $vm->{$name};

	write_to_config($cfg);
    };

    if ($source->{vmid}) {
	die "VM $source->{vmid} doesn't exist\n" if !vm_exists($source);
	my $disks = get_disks($source);
	$vm->{$name}->{vmid} = $source->{vmid};
	$vm->{$name}->{lsync} = 0;
	$vm->{$name}->{source_ip} = $source->{ip} if $source->{ip};

	&$add_job($vm, $name);

    } else {
	$vm->{$name}->{source_pool} = $source->{pool};
        $vm->{$name}->{source_ip} = $source->{ip} if $source->{ip};
	$vm->{$name}->{source_path} = $source->{path} if $source->{path};
	$vm->{$name}->{lsync} = 0;

	&$add_job($vm, $name);
    }

    eval {sync($param) if !$param->{skip};};
    if(my $err = $@) {
	destroy($param);
	print $err;
    }
}

sub destroy {
    my ($param) = @_;

    my $cfg = read_from_config("$CONFIG_PATH$CONFIG");
    my $name =  $param->{name} ? $param->{name} : "default";

    my $source = parse_target($param->{source});

    my $delete_configs = sub {
	my ($path, $name, $cfg) = @_;

	die "Source does not exist!\n" unless $cfg->{$path} ;

	die "Sync Name does not exist!\n" unless $cfg->{$path}->{$name};

	my $source = $cfg->{$path}->{$name}->{source_ip} ? "$cfg->{$path}->{$name}->{source_ip}:"  : '';

	$source .= $cfg->{$path}->{$name}->{source_pool} if $cfg->{$path}->{$name}->{source_pool};
	$source .= $cfg->{$path}->{$name}->{source_path} ? $cfg->{$path}->{$name}->{source_path}  :'';

	my $dest = $cfg->{$path}->{$name}->{dest_ip} ? $cfg->{$path}->{$name}->{dest_ip}  :"";
	$dest .= $cfg->{$path}->{$name}->{dest_pool} if $cfg->{$path}->{$name}->{dest_pool};
	$dest .= $cfg->{$path}->{$name}->{dest_path} ? $cfg->{$path}->{$name}->{dest_path}  :'';

	delete $cfg->{$path}->{$name};

	delete $cfg->{$path} if keys%{$cfg->{$path}} == 0;

	write_to_config($cfg);

	cron_del($source, $dest, $name);
    };


    if ($source->{vmid}) {
	my $path = $source->{vmid};

        &$delete_configs($path, $name, $cfg)

    } else {

	my $path = $source->{pool};
	$path .= $source->{path} if $source->{path};

	&$delete_configs($path, $name, $cfg);
    }
}

sub sync {
    my ($param) = @_;

    my $cfg = read_from_config("$CONFIG_PATH$CONFIG");

    my $name =  $param->{name} ? $param->{name} : "default";
    my $max_snap = $param->{maxsnap} ? $param->{maxsnap} : 1;
    my $method = $param->{method} ? $param->{method} : "ssh";

    my $dest = parse_target($param->{dest});
    my $source = parse_target($param->{source});

    my $sync_path = sub {
	my ($source, $name, $cfg, $max_snap, $dest, $method) = @_;

	($source->{old_snap},$source->{last_snap}) = snapshot_get($source, $dest, $max_snap, $name);

	my $job_status = check_config($source, $name, $cfg) if $cfg;
	die "VM Status: $job_status syncing will not done!\n" if ($job_status && $job_status ne "ok");

	if ($job_status) {
	    my $conf_name = $source->{abs_path};
	    $conf_name = $source->{vmid} if $source->{vmid};
	    $cfg->{$conf_name}->{$name}->{status} = "syncing";
	    write_to_config($cfg);
	}

	my $date = undef;

	eval{
	    $date = snapshot_add($source, $dest, $name);

	    send_image($source, $dest, $method, $param->{verbose}, $param->{limit});

	    snapshot_destroy($source, $dest, $method, $source->{old_snap}) if ($source->{destroy} && $source->{old_snap});
	};
	if(my $err = $@){
	    if ($job_status){
		my $conf_name = $source->{abs_path};
		$conf_name = $source->{vmid} if $source->{vmid};
		$cfg->{$conf_name}->{$name}->{status} = "error";
		write_to_config($cfg);
		my $source_target = $source->{ip} ? $source->{ip}.":" : '';
		$source_target .= $source->{vmid} ? $source->{vmid} : $source->{abs_path};
		cron_del($source_target, $dest->{abs_path}, $name);
	    }
	    die "$err\n";
	}

	if ($job_status) {
	    my $conf_name = $source->{abs_path};
	    $conf_name = $source->{vmid} if $source->{vmid};
	    $cfg->{$conf_name}->{$name}->{status} = "ok";
	    $cfg->{$conf_name}->{$name}->{lsync} = $date;
	    write_to_config($cfg);
	}
    };

    $param->{method}  = "ssh" if  !$param->{method};

    if ($source->{vmid}) {
        die "VM $source->{vmid} doesn't exist\n" if !vm_exists($source);
	my $disks = get_disks($source);

        foreach my $disk (sort keys %{$disks}) {
	    $source->{abs_path} = $disks->{$disk}->{pool};
	    $source->{abs_path} .= "\/$disks->{$disk}->{path}" if $disks->{$disk}->{path};

	    $source->{pool} = $disks->{$disk}->{pool};
	    $source->{path} = "\/$disks->{$disk}->{path}";

	    &$sync_path($source, $name, $cfg, $max_snap, $dest, $method);
	}
	if ($method eq "ssh") {
	    send_config($source, $dest,'ssh');
	}
    } else {
	&$sync_path($source, $name, $cfg, $max_snap, $dest, $method);
    }
}

sub snapshot_get{
    my ($source, $dest, $max_snap, $name) = @_;

    my $cmd = "zfs list -r -t snapshot -Ho name, -S creation ";

    $cmd .= $source->{abs_path};
    $cmd = "ssh root\@$source->{ip} ".$cmd if $source->{ip};

    my $raw = run_cmd($cmd);
    my $index = 1;
    my $line = "";
    my $last_snap = undef;

    while ($raw && $raw =~ s/^(.*?)(\n|$)//) {
	$line = $1;
	$last_snap = $line if $index == 1;
	if ($index == $max_snap) {
	    $source->{destroy} = 1;
	    last;
	};
	$index++;
    }

    $line =~ m/^(.+)\@(rep_$name\_.+)(\n|$)/;
    return ($2, $last_snap) if $2;

    return undef;
}

sub snapshot_add {
    my ($source, $dest, $name) = @_;

    my $date = get_date();

    my $snap_name = "rep_$name\_".$date;

    $source->{new_snap} = $snap_name;

    my $path = $source->{abs_path}."\@".$snap_name;

    my $cmd = "zfs snapshot $path";
    $cmd = "ssh root\@$source->{ip}  ".$cmd if $source->{ip};

    eval{
	run_cmd($cmd);
    };

    if (my $err = $@){
	snapshot_destroy($source, $dest, 'ssh', $snap_name);
	die "$err\n";
    }
    return $date;
}

sub cron_add {
    my ($vm) = @_;

    my $text ="";

    unless(-e $CRONJOBS){
	$text .= 'SHELL=/bin/sh'."\n";
	$text .= 'PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin'."\n ";
    }
    
    open(my $fh, '>>', "$CRONJOBS")
	or die "Could not open file: $!\n";

    foreach my $name (keys%{$vm}){
	$text .= "*/$vm->{$name}->{interval} * * * * root ";
	$text .= "$PATH$PROGNAME sync";
	$text .= " -source  ";
	if ($vm->{$name}->{vmid}) {
	    $text .= "$vm->{$name}->{source_ip}:" if $vm->{$name}->{source_ip};
	    $text .= "$vm->{$name}->{vmid} ";
	} else {
	    $text .= "$vm->{$name}->{source_ip}:" if $vm->{$name}->{source_ip};
	    $text .= "$vm->{$name}->{source_pool}";
	    $text .= "$vm->{$name}->{source_path}" if $vm->{$name}->{source_path};
	}
	$text .= " -dest  ";
	$text .= "$vm->{$name}->{dest_ip}:" if $vm->{$name}->{dest_ip};
	$text .= "$vm->{$name}->{dest_pool}";
	$text .= "$vm->{$name}->{dest_path}" if $vm->{$name}->{dest_path};
	$text .= " -name $name ";
	$text .= " -limit $vm->{$name}->{limit}" if $vm->{$name}->{limit};
	$text .= " -maxsnap $vm->{$name}->{maxsnap}" if $vm->{$name}->{maxsnap};
	$text .= "\n";
	print($fh $text);
    }
    close($fh);
}

sub cron_del {
    my ($source, $dest, $name) = @_;

    open(my $fh, '<', "$CRONJOBS")
	or die "Could not open file: $!\n";

    $/ = undef;

    my $text = <$fh>;
    my $buffer = "";
    close($fh);
    while ($text && $text =~ s/^(.*?)(\n|$)//) {
	my $line = $1.$2;
	if ($line !~ m/^.*root $PATH$PROGNAME sync -source  $source.*-dest  $dest.*-name $name.*$/){
	    $buffer .= $line;
	}
    }
    open($fh, '>', "$CRONJOBS")
	or die "Could not open file: $!\n";
    print($fh $buffer);
    close($fh);
}

sub get_disks {
    my ($target) = @_;

    my $cmd = "";
    $cmd = "ssh root\@$target->{ip} " if $target->{ip};
    $cmd .= "qm config $target->{vmid}";

    my $res = run_cmd($cmd);

    my $disks = parse_disks($res, $target->{ip});

    return $disks;
}

sub run_cmd {
    my ($cmd) = @_;
    print "Start CMD\n" if $DEBUG;
    print Dumper $cmd if $DEBUG;
    my $output = `$cmd 2>&1`;

    die $output if 0 != $?;

    chomp($output);
    print Dumper $output if $DEBUG;
    print "END CMD\n" if $DEBUG;
    return $output;
}

sub parse_disks {
    my ($text, $ip) = @_;

    my $disks;

    my $num = 0;
    my $cmd = "";
    $cmd .= "ssh root\@$ip " if $ip;
    $cmd .= "pvesm zfsscan";
    my $zfs_pools = run_cmd($cmd);
    while ($text && $text =~ s/^(.*?)(\n|$)//) {
	my $line = $1;
	my $disk = undef;
	my $stor = undef;
	my $is_disk = $line =~ m/^(virtio|ide|scsi|sata){1}\d+: /;
	if($line =~ m/^(virtio\d+: )(.+:)([A-Za-z0-9\-]+),(.*)$/) {
	    $disk = $3;
	    $stor = $2;
	} elsif($line =~ m/^(ide\d+: )(.+:)([A-Za-z0-9\-]+),(.*)$/) {
	    $disk = $3;
	    $stor = $2;
	} elsif($line =~ m/^(scsi\d+: )(.+:)([A-Za-z0-9\-]+),(.*)$/) {
	    $disk = $3;
	    $stor = $2;
	} elsif($line =~ m/^(sata\d+: )(.+:)([A-Za-z0-9\-]+),(.*)$/) {
	    $disk = $3;
	    $stor = $2;
	}

	die "disk is not on ZFS Storage\n" if $is_disk && !$disk && $line !~ m/cdrom/;

	if($disk && $line !~ m/none/ && $line !~ m/cdrom/ ) {
	    my $cmd = "";
	    $cmd .= "ssh root\@$ip " if $ip;
	    $cmd .= "pvesm path $stor$disk";
	    my $path = run_cmd($cmd);

	    if ($path =~ m/^\/dev\/zvol\/(\w+).*(\/$disk)$/){

		$disks->{$num}->{pool} = $1;
		$disks->{$num}->{path} = $disk;
		$num++;

	    } else {
		die "ERROR: in path\n";
	    }
	}
    }
    return $disks;
}

sub snapshot_destroy {
    my ($source, $dest, $method, $snap) = @_;

    my $zfscmd = "zfs destroy ";
    my $name = "$source->{path}\@$snap";

    eval {
	if($source->{ip} && $method eq 'ssh'){
	    run_cmd("ssh root\@$source->{ip} $zfscmd $source->{pool}$name");
	} else {
	    run_cmd("$zfscmd $source->{pool}$name");
	}
    };
    if (my $erro = $@) {
	warn "WARN: $erro";
    }
    if ($dest){
	my $ssh =  $dest->{ip} ? "ssh root\@$dest->{ip}" : "";

	my $path = "";
	$path ="$dest->{path}" if $dest->{path};

	my @dir = split(/\//, $source->{path});
	eval {
	    run_cmd("$ssh $zfscmd $dest->{pool}$path\/$dir[@dir-1]\@$snap ");
	};
	if (my $erro = $@) {
	    warn "WARN: $erro";
	}
    }
}

sub snapshot_exist {
    my ($source ,$dest, $method) = @_;

    my $cmd = "";
    $cmd = "ssh root\@$dest->{ip} " if $dest->{ip};
    $cmd .= "zfs list -rt snapshot -Ho name $dest->{pool}";
    $cmd .= "$dest->{path}" if $dest->{path};
    my @dir = split(/\//, $source->{path});
    $cmd .= "\/$dir[@dir-1]\@$source->{old_snap}";

    my $text = "";
    eval {$text =run_cmd($cmd);};
    if (my $erro = $@) {
	warn "WARN: $erro";
	return undef;
    }

    while ($text && $text =~ s/^(.*?)(\n|$)//) {
	my $line = $1;
	return 1 if $line =~ m/^.*$source->{old_snap}$/;
    }
}

sub send_image {
    my ($source, $dest, $method, $verbose, $limit) = @_;

    my $cmd = "";

    $cmd .= "ssh root\@$source->{ip} " if $source->{ip};
    $cmd .= "zfs send ";
    $cmd .= "-v " if $verbose;

    if($source->{last_snap} && snapshot_exist($source ,$dest, $method)) {
	$cmd .= "-i $source->{abs_path}\@$source->{old_snap} $source->{abs_path}\@$source->{new_snap} ";
    } else {
	$cmd .= "$source->{abs_path}\@$source->{new_snap} ";
    }

    if ($limit){
	my $bwl = $limit*1024;
	$cmd .= "| cstream  -t $bwl";
    }
    $cmd .= "| ";
    $cmd .= "ssh root\@$dest->{ip} " if $dest->{ip};
    $cmd .= "zfs recv $dest->{pool}";
    $cmd .= "$dest->{path}" if $dest->{path};

    my @dir = split(/\//,$source->{path});
    $cmd .= "\/$dir[@dir-1]\@$source->{new_snap}";

    eval {
	run_cmd($cmd)
    };

    if (my $erro = $@) {
	snapshot_destroy($source, undef, $method, $source->{new_snap});
	die $erro;
    };
}


sub send_config{
    my ($source, $dest, $method) = @_;

    if ($method eq 'ssh'){
	if ($dest->{ip} && $source->{ip}) {
	    run_cmd("ssh root\@$dest->{ip} mkdir $VMCONFIG -p");
	    run_cmd("scp root\@$source->{ip}:$QEMU_CONF$source->{vmid}.conf root\@$dest->{ip}:$VMCONFIG$source->{vmid}.conf.$source->{new_snap}");
	} elsif ($dest->{ip}) {
	    run_cmd("ssh root\@$dest->{ip} mkdir $VMCONFIG -p");
	    run_cmd("scp $QEMU_CONF$source->{vmid}.conf root\@$dest->{ip}:$VMCONFIG$source->{vmid}.conf.$source->{new_snap}");
	} elsif ($source->{ip}) {
	    run_cmd("mkdir $VMCONFIG -p");
	    run_cmd("scp root\@$source->{ip}:$QEMU_CONF$source->{vmid}.conf $VMCONFIG$source->{vmid}.conf.$source->{new_snap}");
	}

	if ($source->{destroy}){
	    if($dest->{ip}){
		run_cmd("ssh root\@$dest->{ip} rm -f $VMCONFIG$source->{vmid}.conf.$source->{old_snap}");
	    } else {
		run_cmd("rm -f $VMCONFIG$source->{vmid}.conf.$source->{old_snap}");
	    }
	}
    }
}

sub get_date {
    my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime(time);
    my $datestamp = sprintf ( "%04d-%02d-%02d_%02d:%02d:%02d",$year+1900,$mon+1,$mday,$hour,$min,$sec);

    return $datestamp;
}

sub status {
    my $cfg = read_from_config("$CONFIG_PATH$CONFIG");

    my $status_list = sprintf("%-25s%-15s%-10s\n","SOURCE","NAME","STATUS");

    foreach my $source (sort keys%{$cfg}){
	foreach my $sync_name (sort keys%{$cfg->{$source}}){
	  my $status;

	  my $source_name = $source;

	  $source_name = $cfg->{$source}->{$sync_name}->{source_ip}.":".$source if $cfg->{$source}->{$sync_name}->{source_ip};

	  $status = sprintf("%-10s",$cfg->{$source}->{$sync_name}->{status});

	  $status_list .= sprintf("%-25s%-15s", cut_to_width($source_name,25), cut_to_width($sync_name,15));
	  $status_list .= "$status\n";
	}
    }

    return $status_list;
}


my $command = $ARGV[0];

my $commands = {'destroy' => 1,
	       'create' => 1,
	       'sync' => 1,
	       'list' => 1,
	       'status' => 1,
	       'help' => 1};

if (!$command ||  !$commands->{$command}) {
    usage();
    die "\n";
}

my $dest = '';
my $source = '';
my $verbose = '';
my $interval = '';
my $limit = '';
my $maxsnap = '';
my $name = '';
my $skip = '';

my $help_sync = "zfs-zsync sync -dest <string> -source <string> [OPTIONS]\n
\twill sync one time\n
\t-dest\tstring\n
\t\tthe destination target is like [IP:]<Pool>[/Path]\n
\t-limit\tinteger\n
\t\tmax sync speed in kBytes/s, default unlimited\n
\t-maxsnap\tinteger\n
\t\thow much snapshots will be kept before get erased, default 1/n
\t-name\tstring\n
\t\tname of the sync job, if not set it is default.
\tIt is only necessary if scheduler allready contains this source.\n
\t-source\tstring\n
\t\tthe source can be an <VMID> or [IP:]<ZFSPool>[/Path]\n";

my $help_create = "zfs-zsync create -dest <string> -source <string> [OPTIONS]/n
\tCreate a sync Job\n
\t-dest\tstringn\n
\t\tthe destination target is like [IP]:<Pool>[/Path]\n
\t-interval\tinteger\n
\t\tthe interval in min in witch the zfs will sync,
\t\tdefault is 15 min\n
\t-limit\tinteger\n
\t\tmax sync speed, default unlimited\n
\t-maxsnap\tstring\n
\t\thow much snapshots will be kept before get erased, default 1\n
\t-name\tstring\n
\t\tname of the sync job, if not set it is default\n
\t-skip\tboolean\n
\t\tif this flag is set it will skip the first sync\n
\t-source\tstring\n
\t\tthe source can be an <VMID> or [IP:]<ZFSPool>[/Path]\n";

my $help_destroy = "zfs-zsync destroy -source <string> [OPTIONS]\n
\tremove a sync Job from the scheduler\n
\t-name\tstring\n
\t\tname of the sync job, if not set it is default\n
\t-source\tstring\n
\t\tthe source can be an  <VMID> or [IP:]<ZFSPool>[/Path]\n";

my $help_help = "zfs-zsync help <cmd> [OPTIONS]\n
\tGet help about specified command.\n
\t<cmd>\tstring\n
\t\tCommand name\n
\t-verbose\tboolean\n
\t\tVerbose output format.\n";

my $help_list = "zfs-zsync list\n
\tGet a List of all scheduled Sync Jobs\n";

my $help_status = "zfs-zsync status\n
\tGet the status of all scheduled Sync Jobs\n";

sub help{
    my ($command) = @_;

    switch($command){
	case 'help'
	{
	    die "$help_help\n";
	}
	case 'sync'
	{
	    die "$help_sync\n";
	}
	case 'destroy'
	{
	    die "$help_destroy\n";
	}
	case 'create'
	{
	    die "$help_create\n";
	}
	case 'list'
	{
	    die "$help_list\n";
	}
	case 'status'
	{
	    die "$help_status\n";
	}
    }

}

my $err = GetOptions ('dest=s' => \$dest,
	   'source=s' => \$source,
	   'verbose' => \$verbose,
	   'interval=i' => \$interval,
	   'limit=i' => \$limit,
	   'maxsnap=i' => \$maxsnap,
	   'name=s' => \$name,
	   'skip' => \$skip);

if ($err == 0) {
    die "can't parse options\n";
}

my $param;
$param->{dest} = $dest;
$param->{source} = $source;
$param->{verbose} = $verbose;
$param->{interval} = $interval;
$param->{limit} = $limit;
$param->{maxsnap} = $maxsnap;
$param->{name} = $name;
$param->{skip} = $skip;

switch($command){
    case "destroy"
    {
	die "$help_destroy\n" if !$source;
	check_target($source);
	destroy($param);
    }
    case "sync"
    {
	die "$help_sync\n" if !$source || !$dest;
	check_target($source);
	check_target($dest);
	sync($param);
    }
    case "create"
    {
	die "$help_create\n" if !$source || !$dest;
	check_target($source);
	check_target($dest);
	init($param);
    }
    case "status"
    {
	print status();
    }
    case "list"
    {
	print list();
    }
    case "help"
    {
	my $help_command = $ARGV[1];
	if ($help_command && $commands->{$help_command}) {
	    print help($help_command);
	}
	if ($verbose){
	    exec("man $PROGNAME");
	} else {
	    usage(1);
	}
    }
}

sub usage{
    my ($help) = @_;

    print("ERROR:\tno command specified\n") if !$help;
    print("USAGE:\t$PROGNAME <COMMAND> [ARGS] [OPTIONS]\n");
    print("\tpve-zsync help [<cmd>] [OPTIONS]\n\n");
    print("\tpve-zsync create -dest <string> -source <string> [OPTIONS]\n");
    print("\tpve-zsync destroy -source <string> [OPTIONS]\n");
    print("\tpve-zsync list\n");
    print("\tpve-zsync status\n");
    print("\tpve-zsync sync -dest <string> -source <string> [OPTIONS]\n");
}

sub check_target{
    my ($target) = @_;

    chomp($target);

    if($target !~ m/(\d+.\d+.\d+.\d+:)?([\w\-\_\/]+)(\/.+)?/){
	print("ERROR:\t$target is not valid.\n\tUse [IP:]<ZFSPool>[/Path]!\n");
	return 1;
    }
    return undef;
}

__END__

=head1 NAME

pve-zsync - PVE ZFS Replication Manager

=head1 SYNOPSIS

zfs-zsync <COMMAND> [ARGS] [OPTIONS]

zfs-zsync help <cmd> [OPTIONS]

	Get help about specified command.

        <cmd>      string

		Command name

	-verbose   boolean

		Verbose output format.

zfs-zsync create -dest <string> -source <string> [OPTIONS]

          Create a sync Job

          -dest      string

		the destination target is like [IP]:<Pool>[/Path]

          -interval  integer

		the interval in min in witch the zfs will sync, default is 15 min

          -limit     integer

		max sync speed, default unlimited

          -maxsnap   string

		how much snapshots will be kept before get erased, default 1

          -name      string

		name of the sync job, if not set it is default

          -skip      boolean

		if this flag is set it will skip the first sync

          -source    string

		the source can be an <VMID> or [IP:]<ZFSPool>[/Path]

zfs-zsync destroy -source <string> [OPTIONS]

          remove a sync Job from the scheduler

          -name      string

		name of the sync job, if not set it is default

          -source    string

                the source can be an  <VMID> or [IP:]<ZFSPool>[/Path]

zfs-zsync list

	Get a List of all scheduled Sync Jobs

zfs-zsync status

	Get the status of all scheduled Sync Jobs

zfs-zsync sync -dest <string> -source <string> [OPTIONS]

	will sync one time

        -dest      string

		the destination target is like [IP:]<Pool>[/Path]

	-limit     integer

		max sync speed in kBytes/s, default unlimited

         -maxsnap   integer

		how much snapshots will be kept before get erased, default 1

         -name      string

		name of the sync job, if not set it is default.
		It is only necessary if scheduler allready contains this source.

          -source    string

		the source can be an <VMID> or [IP:]<ZFSPool>[/Path]

=head1 DESCRIPTION

This Tool helps you to sync your VM or directory which stored on ZFS between 2 servers.
This tool also has the capability to add jobs to cron so the sync will be automatically done.

=head2 PVE ZFS Storage sync Tool

This Tool can get remote pool on other PVE or send Pool to others ZFS machines

=head1 EXAMPLES

add sync job from local VM to remote ZFS Server
zfs-zsync -source=100 -dest=192.168.1.2:zfspool

=head1 IMPORTANT FILES

Where the cron jobs are stored                            /etc/cron.d/pve-zsync
Where the VM config get copied on the destination machine /var/pve-zsync
Where the config is stored                                /var/pve-zsync

Copyright (C) 2007-2015 Proxmox Server Solutions GmbH

This program is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

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
Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public
License along with this program.  If not, see
<http://www.gnu.org/licenses/>.