VZDump: send an error email in case of lock failure

[pve-manager.git] / PVE / VZDump.pm

package PVE::VZDump;

use strict;
use warnings;
use Fcntl ':flock';
use PVE::Exception qw(raise_param_exc);
use PVE::SafeSyslog;
use IO::File;
use IO::Select;
use IPC::Open3;
use POSIX qw(strftime);
use File::Path;
use PVE::RPCEnvironment;
use PVE::Storage;
use PVE::Cluster qw(cfs_read_file);
use PVE::VZDump::OpenVZ;
use Time::localtime;
use Time::Local;
use PVE::JSONSchema qw(get_standard_option);

my @posix_filesystems = qw(ext3 ext4 nfs nfs4 reiserfs xfs);

my $lockfile = '/var/run/vzdump.lock';

my $logdir = '/var/log/vzdump';

my @plugins = qw (PVE::VZDump::OpenVZ);

# Load available plugins
my $pveplug = "/usr/share/perl5/PVE/VZDump/QemuServer.pm";
if (-f $pveplug) {
    eval { require $pveplug; };
    if (!$@) {
	PVE::VZDump::QemuServer->import ();
	  push @plugins, "PVE::VZDump::QemuServer";
      } else {
	  warn $@;
      }
}

# helper functions

my $debugstattxt = {
    err =>  'ERROR:',
    info => 'INFO:',
    warn => 'WARN:',
};

sub debugmsg {
    my ($mtype, $msg, $logfd, $syslog) = @_;

    chomp $msg;

    return if !$msg;

    my $pre = $debugstattxt->{$mtype} || $debugstattxt->{'err'};

    my $timestr = strftime ("%b %d %H:%M:%S", CORE::localtime);

    syslog ($mtype eq 'info' ? 'info' : 'err', "$pre $msg") if $syslog;

    foreach my $line (split (/\n/, $msg)) {
	print STDERR "$pre $line\n";
	print $logfd "$timestr $pre $line\n" if $logfd;
    }
}

sub run_command {
    my ($logfd, $cmdstr, %param) = @_;

    my $logfunc = sub {
	my $line = shift;
	debugmsg ('info', $line, $logfd);
    };

    PVE::Tools::run_command($cmdstr, %param, logfunc => $logfunc);
}

sub storage_info {
    my $storage = shift;

    my $cfg = cfs_read_file('storage.cfg');
    my $scfg = PVE::Storage::storage_config($cfg, $storage);
    my $type = $scfg->{type};
 
    die "can't use storage type '$type' for backup\n" 
	if (!($type eq 'dir' || $type eq 'nfs' || $type eq 'glusterfs'));
    die "can't use storage for backups - wrong content type\n" 
	if (!$scfg->{content}->{backup});

    PVE::Storage::activate_storage($cfg, $storage);

    return {
	dumpdir => PVE::Storage::get_backup_dir($cfg, $storage),
	maxfiles => $scfg->{maxfiles},
    };
}

sub format_size {
    my $size = shift;

    my $kb = $size / 1024;

    if ($kb < 1024) {
	return int ($kb) . "KB";
    }

    my $mb = $size / (1024*1024);

    if ($mb < 1024) {
	return int ($mb) . "MB";
    } else {
	my $gb = $mb / 1024;
	return sprintf ("%.2fGB", $gb);
    } 
}

sub format_time {
    my $seconds = shift;

    my $hours = int ($seconds/3600);
    $seconds = $seconds - $hours*3600;
    my $min = int ($seconds/60);
    $seconds = $seconds - $min*60;

    return sprintf ("%02d:%02d:%02d", $hours, $min, $seconds);
}

sub encode8bit {
    my ($str) = @_;

    $str =~ s/^(.{990})/$1\n/mg; # reduce line length

    return $str;
}

sub escape_html {
    my ($str) = @_;

    $str =~ s/&/&amp;/g;
    $str =~ s/</&lt;/g;
    $str =~ s/>/&gt;/g;

    return $str;
}

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

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

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

sub check_vmids {
    my (@vmids) = @_;

    my $res = [];
    foreach my $vmid (@vmids) {
	die "ERROR: strange VM ID '${vmid}'\n" if $vmid !~ m/^\d+$/;
	$vmid = int ($vmid); # remove leading zeros
	next if !$vmid;
	push @$res, $vmid;
    }

    return $res;
}


sub read_vzdump_defaults {

    my $fn = "/etc/vzdump.conf";

    my $res = {
	bwlimit => 0,
	ionice => 7,
	size => 1024,
	lockwait => 3*60, # 3 hours
	stopwait => 10, # 10 minutes
	mode => 'snapshot',
	maxfiles => 1, 
    };

    my $fh = IO::File->new ("<$fn");
    return $res if !$fh;
    
    my $line;
    while (defined ($line = <$fh>)) {
	next if $line =~ m/^\s*$/;
	next if $line =~ m/^\#/;

	if ($line =~ m/tmpdir:\s*(.*\S)\s*$/) {
	    $res->{tmpdir} = $1;
	} elsif ($line =~ m/dumpdir:\s*(.*\S)\s*$/) {
	    $res->{dumpdir} = $1;
	} elsif ($line =~ m/storage:\s*(\S+)\s*$/) {
	    $res->{storage} = $1;
	} elsif ($line =~ m/script:\s*(.*\S)\s*$/) {
	    $res->{script} = $1;
	} elsif ($line =~ m/bwlimit:\s*(\d+)\s*$/) {
	    $res->{bwlimit} = int($1);
	} elsif ($line =~ m/ionice:\s*([0-8])\s*$/) {
	    $res->{ionice} = int($1);
	} elsif ($line =~ m/lockwait:\s*(\d+)\s*$/) {
	    $res->{lockwait} = int($1);
	} elsif ($line =~ m/stopwait:\s*(\d+)\s*$/) {
	    $res->{stopwait} = int($1);
	} elsif ($line =~ m/size:\s*(\d+)\s*$/) {
	    $res->{size} = int($1);
	} elsif ($line =~ m/maxfiles:\s*(\d+)\s*$/) {
	    $res->{maxfiles} = int($1);
	} elsif ($line =~ m/exclude-path:\s*(.*)\s*$/) {
	    $res->{'exclude-path'} = PVE::Tools::split_args($1); 
	} elsif ($line =~ m/mode:\s*(stop|snapshot|suspend)\s*$/) {
	    $res->{mode} = $1;
	} else {
	    debugmsg ('warn', "unable to parse configuration file '$fn' - error at line " . $., undef, 1);
	}

    }
    close ($fh);

    return $res;
}


sub find_add_exclude {
    my ($self, $excltype, $value) = @_;

    if (($excltype eq '-regex') || ($excltype eq '-files')) {
	$value = "\.$value";
    }

    if ($excltype eq '-files') {
	push @{$self->{findexcl}}, "'('", '-not', '-type', 'd', '-regex' , "'$value'", "')'", '-o';
    } else {
	push @{$self->{findexcl}}, "'('", $excltype , "'$value'", '-prune', "')'", '-o';
    }
}

sub sendmail {
    my ($self, $tasklist, $totaltime, $err) = @_;

    my $opts = $self->{opts};

    my $mailto = $opts->{mailto};

    return if !($mailto && scalar(@$mailto));

    my $cmdline = $self->{cmdline};

    my $ecount = 0;
    foreach my $task (@$tasklist) {
	$ecount++ if $task->{state} ne 'ok';
	chomp $task->{msg} if $task->{msg};
	$task->{backuptime} = 0 if !$task->{backuptime};
	$task->{size} = 0 if !$task->{size};
	$task->{tarfile} = 'unknown' if !$task->{tarfile};
	$task->{hostname} = "VM $task->{vmid}" if !$task->{hostname};

	if ($task->{state} eq 'todo') {
	    $task->{msg} = 'aborted';
	}
    }

    my $stat = ($ecount || $err) ? 'backup failed' : 'backup successful';
    $stat .= ": $err" if $err;

    my $hostname = `hostname -f` || PVE::INotify::nodename();
    chomp $hostname;

    my $boundary = "----_=_NextPart_001_".int(time).$$;

    my $rcvrarg = '';
    foreach my $r (@$mailto) {
	$rcvrarg .= " '$r'";
    }
    my $dcconf = PVE::Cluster::cfs_read_file('datacenter.cfg');
    my $mailfrom = $dcconf->{email_from} || "root";

    open (MAIL,"|sendmail -B 8BITMIME -f $mailfrom $rcvrarg") || 
	die "unable to open 'sendmail' - $!";

    my $rcvrtxt = join (', ', @$mailto);

    print MAIL "Content-Type: multipart/alternative;\n";
    print MAIL "\tboundary=\"$boundary\"\n";
    print MAIL "MIME-Version: 1.0\n";

    print MAIL "FROM: vzdump backup tool <$mailfrom>\n";
    print MAIL "TO: $rcvrtxt\n";
    print MAIL "SUBJECT: vzdump backup status ($hostname) : $stat\n";
    print MAIL "\n";
    print MAIL "This is a multi-part message in MIME format.\n\n";
    print MAIL "--$boundary\n";

    print MAIL "Content-Type: text/plain;\n";
    print MAIL "\tcharset=\"UTF8\"\n";
    print MAIL "Content-Transfer-Encoding: 8bit\n";
    print MAIL "\n";

    # text part

    my $fill = '  '; # Avoid The Remove Extra Line Breaks Issue (MS Outlook)

    print MAIL sprintf ("${fill}%-10s %-6s %10s %10s  %s\n", qw(VMID STATUS TIME SIZE FILENAME));
    foreach my $task (@$tasklist) {
	my $vmid = $task->{vmid};
	if  ($task->{state} eq 'ok') {

	    print MAIL sprintf ("${fill}%-10s %-6s %10s %10s  %s\n", $vmid, 
				$task->{state}, 
				format_time($task->{backuptime}),
				format_size ($task->{size}),
				$task->{tarfile});
	} else {
	    print MAIL sprintf ("${fill}%-10s %-6s %10s %8.2fMB  %s\n", $vmid, 
				$task->{state}, 
				format_time($task->{backuptime}),
				0, '-');
	}
    }
    print MAIL "${fill}\n";
    print MAIL "${fill}Detailed backup logs:\n";
    print MAIL "${fill}\n";
    print MAIL "$fill$cmdline\n";
    print MAIL "${fill}\n";

    foreach my $task (@$tasklist) {
	my $vmid = $task->{vmid};
	my $log = $task->{tmplog};
	if (!$log) {
	    print MAIL "${fill}$vmid: no log available\n\n";
	    next;
	}
	open (TMP, "$log");
	while (my $line = <TMP>) { print MAIL encode8bit ("${fill}$vmid: $line"); }
	close (TMP);
	print MAIL "${fill}\n";
    }

    # end text part
    print MAIL "\n--$boundary\n";

    print MAIL "Content-Type: text/html;\n";
    print MAIL "\tcharset=\"UTF8\"\n";
    print MAIL "Content-Transfer-Encoding: 8bit\n";
    print MAIL "\n";

    # html part

    print MAIL "<html><body>\n";

    print MAIL "<table border=1 cellpadding=3>\n";

    print MAIL "<tr><td>VMID<td>NAME<td>STATUS<td>TIME<td>SIZE<td>FILENAME</tr>\n";

    my $ssize = 0;

    foreach my $task (@$tasklist) {
	my $vmid = $task->{vmid};
	my $name = $task->{hostname};

	if  ($task->{state} eq 'ok') {

	    $ssize += $task->{size};

	    print MAIL sprintf ("<tr><td>%s<td>%s<td>OK<td>%s<td align=right>%s<td>%s</tr>\n", 
				$vmid, $name,
				format_time($task->{backuptime}),
				format_size ($task->{size}),
				escape_html ($task->{tarfile}));
	} else {
	    print MAIL sprintf ("<tr><td>%s<td>%s<td><font color=red>FAILED<td>%s<td colspan=2>%s</tr>\n",
 
				$vmid, $name, format_time($task->{backuptime}), 
				escape_html ($task->{msg}));
	}
    }

    print MAIL sprintf ("<tr><td align=left colspan=3>TOTAL<td>%s<td>%s<td></tr>",
 format_time ($totaltime), format_size ($ssize));

    print MAIL "</table><br><br>\n";
    print MAIL "Detailed backup logs:<br>\n";
    print MAIL "<br>\n";
    print MAIL "<pre>\n";
    print MAIL escape_html($cmdline) . "\n";
    print MAIL "\n";

    foreach my $task (@$tasklist) {
	my $vmid = $task->{vmid};
	my $log = $task->{tmplog};
	if (!$log) {
	    print MAIL "$vmid: no log available\n\n";
	    next;
	}
	open (TMP, "$log");
	while (my $line = <TMP>) {
	    if ($line =~ m/^\S+\s\d+\s+\d+:\d+:\d+\s+(ERROR|WARN):/) {
		print MAIL encode8bit ("$vmid: <font color=red>". 
				       escape_html ($line) . "</font>"); 
	    } else {
		print MAIL encode8bit ("$vmid: " . escape_html ($line)); 
	    }
	}
	close (TMP);
	print MAIL "\n";
    }
    print MAIL "</pre>\n";

    print MAIL "</body></html>\n";

    # end html part
    print MAIL "\n--$boundary--\n";

    close(MAIL);
};

sub new {
    my ($class, $cmdline, $opts, $skiplist) = @_;

    mkpath $logdir;

    check_bin ('cp');
    check_bin ('df');
    check_bin ('sendmail');
    check_bin ('rsync');
    check_bin ('tar');
    check_bin ('mount');
    check_bin ('umount');
    check_bin ('cstream');
    check_bin ('ionice');

    if ($opts->{mode} && $opts->{mode} eq 'snapshot') {
	check_bin ('lvcreate');
	check_bin ('lvs');
	check_bin ('lvremove');
    }

    my $defaults = read_vzdump_defaults();

    my $maxfiles = $opts->{maxfiles}; # save here, because we overwrite with default

    $opts->{remove} = 1 if !defined($opts->{remove});

    foreach my $k (keys %$defaults) {
	if ($k eq 'dumpdir' || $k eq 'storage') {
	    $opts->{$k} = $defaults->{$k} if !defined ($opts->{dumpdir}) &&
		!defined ($opts->{storage});
	} else {
	    $opts->{$k} = $defaults->{$k} if !defined ($opts->{$k});
	}
    }

    $opts->{dumpdir} =~ s|/+$|| if ($opts->{dumpdir});
    $opts->{tmpdir} =~ s|/+$|| if ($opts->{tmpdir});

    $skiplist = [] if !$skiplist;
    my $self = bless { cmdline => $cmdline, opts => $opts, skiplist => $skiplist };

    #always skip '.'
    push @{$self->{findexcl}}, "'('", '-regex' , "'^\\.\$'", "')'", '-o';

    $self->find_add_exclude ('-type', 's'); # skip sockets

    if ($defaults->{'exclude-path'}) {
	foreach my $path (@{$defaults->{'exclude-path'}}) {
	    $self->find_add_exclude ('-regex', $path);
	}
    }

    if ($opts->{'exclude-path'}) {
	foreach my $path (@{$opts->{'exclude-path'}}) {
	    $self->find_add_exclude ('-regex', $path);
	}
    }

    if ($opts->{stdexcludes}) {
	$self->find_add_exclude ('-files', '/var/log/.+');
	$self->find_add_exclude ('-regex', '/tmp/.+');
	$self->find_add_exclude ('-regex', '/var/tmp/.+');
	$self->find_add_exclude ('-regex', '/var/run/.+pid');
    }

    foreach my $p (@plugins) {

	my $pd = $p->new ($self);

	push @{$self->{plugins}}, $pd;
    }

    if (!$opts->{dumpdir} && !$opts->{storage}) {
	$opts->{storage} = 'local';
    }

    if ($opts->{storage}) {
	my $info = storage_info ($opts->{storage});
	$opts->{dumpdir} = $info->{dumpdir};
	$maxfiles = $info->{maxfiles} if !defined($maxfiles) && defined($info->{maxfiles});
    } elsif ($opts->{dumpdir}) {
	die "dumpdir '$opts->{dumpdir}' does not exist\n"
	    if ! -d $opts->{dumpdir};
    } else {
	die "internal error"; 
    }

    if ($opts->{tmpdir} && ! -d $opts->{tmpdir}) {
	die "tmpdir '$opts->{tmpdir}' does not exist\n";
    }

    $opts->{maxfiles} = $maxfiles if defined($maxfiles);

    return $self;

}

sub get_lvm_mapping {

    my $devmapper;

    my $cmd = ['lvs', '--units', 'm', '--separator', ':', '--noheadings',
	       '-o', 'vg_name,lv_name,lv_size' ];

    my $parser = sub {
	my $line = shift;
	if ($line =~ m|^\s*(\S+):(\S+):(\d+(\.\d+))[Mm]$|) {
	    my $vg = $1;
	    my $lv = $2;
	    $devmapper->{"/dev/$vg/$lv"} = [$vg, $lv];
	    my $qlv = $lv;
	    $qlv =~ s/-/--/g;
	    my $qvg = $vg;
	    $qvg =~ s/-/--/g;
	    $devmapper->{"/dev/mapper/$qvg-$qlv"} = [$vg, $lv];
	}			
    };

    eval { PVE::Tools::run_command($cmd, errfunc => sub {}, outfunc => $parser); };
    warn $@ if $@;

    return $devmapper;
}

sub get_mount_info {
    my ($dir) = @_;

    # Note: df 'available' can be negative, and percentage set to '-'

    my $cmd = [ 'df', '-P', '-T', '-B', '1', $dir];

    my $res;

    my $parser = sub {
	my $line = shift;
	if (my ($fsid, $fstype, undef, $mp) = $line =~
	    m!(\S+.*)\s+(\S+)\s+\d+\s+\-?\d+\s+\d+\s+(\d+%|-)\s+(/.*)$!) {
	    $res = {
		device => $fsid,
		fstype => $fstype,
		mountpoint => $mp,
	    };
	}
    };

    eval { PVE::Tools::run_command($cmd, errfunc => sub {}, outfunc => $parser); };
    warn $@ if $@;

    return $res;
}

sub get_lvm_device {
    my ($dir, $mapping) = @_;

    my $info = get_mount_info($dir);

    return undef if !$info;
   
    my $dev = $info->{device};

    my ($vg, $lv);

    ($vg, $lv) = @{$mapping->{$dev}} if defined $mapping->{$dev};

    return wantarray ? ($dev, $info->{mountpoint}, $vg, $lv, $info->{fstype}) : $dev;
}

sub getlock {
    my ($self) = @_;

    my $maxwait = $self->{opts}->{lockwait} || $self->{lockwait};
 
    if (!open (SERVER_FLCK, ">>$lockfile")) {
	debugmsg ('err', "can't open lock on file '$lockfile' - $!", undef, 1);
	die "can't open lock on file '$lockfile' - $!";
    }

    if (flock (SERVER_FLCK, LOCK_EX|LOCK_NB)) {
	return;
    }

    if (!$maxwait) {
	debugmsg ('err', "can't aquire lock '$lockfile' (wait = 0)", undef, 1);
	die "can't aquire lock '$lockfile' (wait = 0)";
    }

    debugmsg('info', "trying to get global lock - waiting...", undef, 1);

    eval {
	alarm ($maxwait * 60);
	
	local $SIG{ALRM} = sub { alarm (0); die "got timeout\n"; };

	if (!flock (SERVER_FLCK, LOCK_EX)) {
	    my $err = $!;
	    close (SERVER_FLCK);
	    alarm (0);
	    die "$err\n";
	}
	alarm (0);
    };
    alarm (0);
    
    my $err = $@;

    if ($err) {
	debugmsg ('err', "can't aquire lock '$lockfile' - $err", undef, 1);
	die "can't aquire lock '$lockfile' - $err";
    }

    debugmsg('info', "got global lock", undef, 1);
}

sub run_hook_script {
    my ($self, $phase, $task, $logfd) = @_;

    my $opts = $self->{opts};

    my $script = $opts->{script};

    return if !$script;

    my $cmd = "$script $phase";

    $cmd .= " $task->{mode} $task->{vmid}" if ($task);

    local %ENV;

    # set immutable opts directly (so they are available in all phases)
    $ENV{STOREID} = $opts->{storage} if $opts->{storage};
    $ENV{DUMPDIR} = $opts->{dumpdir} if $opts->{dumpdir};

    foreach my $ek (qw(vmtype hostname tarfile logfile)) {
	$ENV{uc($ek)} = $task->{$ek} if $task->{$ek};
    }

    run_command ($logfd, $cmd);
}

sub compressor_info {
    my ($opt_compress) = @_;

    if (!$opt_compress || $opt_compress eq '0') {
	return undef;
    } elsif ($opt_compress eq '1' || $opt_compress eq 'lzo') {
	return ('lzop', 'lzo');
    } elsif ($opt_compress eq 'gzip') {
	return ('gzip', 'gz');
    } else {
	die "internal error - unknown compression option '$opt_compress'";
    }
}

sub get_backup_file_list {
    my ($dir, $bkname, $exclude_fn) = @_;

    my $bklist = [];
    foreach my $fn (<$dir/${bkname}-*>) {
	next if $exclude_fn && $fn eq $exclude_fn;
	if ($fn =~ m!/(${bkname}-(\d{4})_(\d{2})_(\d{2})-(\d{2})_(\d{2})_(\d{2})\.(tgz|((tar|vma)(\.(gz|lzo))?)))$!) {
	    $fn = "$dir/$1"; # untaint
	    my $t = timelocal ($7, $6, $5, $4, $3 - 1, $2 - 1900);
	    push @$bklist, [$fn, $t];
	}
    }

    return $bklist;
}
 
sub exec_backup_task {
    my ($self, $task) = @_;
	 
    my $opts = $self->{opts};

    my $vmid = $task->{vmid};
    my $plugin = $task->{plugin};

    my $vmstarttime = time ();
    
    my $logfd;

    my $cleanup = {};

    my $vmstoptime = 0;

    eval {
	die "unable to find VM '$vmid'\n" if !$plugin;

	my $vmtype = $plugin->type();

	my $tmplog = "$logdir/$vmtype-$vmid.log";

	my $lt = localtime();

	my $bkname = "vzdump-$vmtype-$vmid";
	my $basename = sprintf "${bkname}-%04d_%02d_%02d-%02d_%02d_%02d", 
	$lt->year + 1900, $lt->mon + 1, $lt->mday, 
	$lt->hour, $lt->min, $lt->sec;

	my $maxfiles = $opts->{maxfiles};

	if ($maxfiles && !$opts->{remove}) {
	    my $bklist = get_backup_file_list($opts->{dumpdir}, $bkname);
	    die "only $maxfiles backup(s) allowed - please consider to remove old backup files.\n" 
		if scalar(@$bklist) >= $maxfiles;
	}

	my $logfile = $task->{logfile} = "$opts->{dumpdir}/$basename.log";

	my $ext = $vmtype eq 'qemu' ? '.vma' : '.tar';
	my ($comp, $comp_ext) = compressor_info($opts->{compress});
	if ($comp && $comp_ext) {
	    $ext .= ".${comp_ext}";
	}

	if ($opts->{stdout}) {
	    $task->{tarfile} = '-';
	} else {
	    my $tarfile = $task->{tarfile} = "$opts->{dumpdir}/$basename$ext";
	    $task->{tmptar} = $task->{tarfile};
	    $task->{tmptar} =~ s/\.[^\.]+$/\.dat/;
	    unlink $task->{tmptar};
	}

	$task->{vmtype} = $vmtype;

	if ($opts->{tmpdir}) {
	    $task->{tmpdir} = "$opts->{tmpdir}/vzdumptmp$$"; 
	} else {
	    # dumpdir is posix? then use it as temporary dir
	    my $info = get_mount_info($opts->{dumpdir});
	    if ($vmtype eq 'qemu' || 
		grep ($_ eq $info->{fstype}, @posix_filesystems)) {
		$task->{tmpdir} = "$opts->{dumpdir}/$basename.tmp";
	    } else {
		$task->{tmpdir} = "/var/tmp/vzdumptmp$$";
		debugmsg ('info', "filesystem type on dumpdir is '$info->{fstype}' -" .
			  "using $task->{tmpdir} for temporary files", $logfd);
	    }
	}

	rmtree $task->{tmpdir};
	mkdir $task->{tmpdir};
	-d $task->{tmpdir} ||
	    die "unable to create temporary directory '$task->{tmpdir}'";

	$logfd = IO::File->new (">$tmplog") ||
	    die "unable to create log file '$tmplog'";

	$task->{dumpdir} = $opts->{dumpdir};
	$task->{storeid} = $opts->{storage};
	$task->{tmplog} = $tmplog;

	unlink $logfile;

	debugmsg ('info',  "Starting Backup of VM $vmid ($vmtype)", $logfd, 1);

	$plugin->set_logfd ($logfd);

	# test is VM is running
	my ($running, $status_text) = $plugin->vm_status ($vmid);

	debugmsg ('info', "status = ${status_text}", $logfd);

	# lock VM (prevent config changes)
	$plugin->lock_vm ($vmid);

	$cleanup->{unlock} = 1;

	# prepare

	my $mode = $running ? $opts->{mode} : 'stop';

	if ($mode eq 'snapshot') {
	    my %saved_task = %$task;
	    eval { $plugin->prepare ($task, $vmid, $mode); };
	    if (my $err = $@) {
		die $err if $err !~ m/^mode failure/;
		debugmsg ('info',  $err, $logfd);
		debugmsg ('info',  "trying 'suspend' mode instead", $logfd);
		$mode = 'suspend'; # so prepare is called again below
		%$task = %saved_task; 
	    }
	}

	$task->{mode} = $mode;

   	debugmsg ('info', "backup mode: $mode", $logfd);

	debugmsg ('info', "bandwidth limit: $opts->{bwlimit} KB/s", $logfd)
	    if $opts->{bwlimit};

	debugmsg ('info', "ionice priority: $opts->{ionice}", $logfd);

	if ($mode eq 'stop') {

	    $plugin->prepare ($task, $vmid, $mode);

	    $self->run_hook_script ('backup-start', $task, $logfd);

	    if ($running) {
		debugmsg ('info', "stopping vm", $logfd);
		$vmstoptime = time ();
		$self->run_hook_script ('pre-stop', $task, $logfd);
		$plugin->stop_vm ($task, $vmid);
		$cleanup->{restart} = 1;
	    }
 

	} elsif ($mode eq 'suspend') {

	    $plugin->prepare ($task, $vmid, $mode);

	    $self->run_hook_script ('backup-start', $task, $logfd);

	    if ($vmtype eq 'openvz') {
		# pre-suspend rsync
		$plugin->copy_data_phase1 ($task, $vmid);
	    }

	    debugmsg ('info', "suspend vm", $logfd);
	    $vmstoptime = time ();
	    $self->run_hook_script ('pre-stop', $task, $logfd);
	    $plugin->suspend_vm ($task, $vmid);
	    $cleanup->{resume} = 1;

	    if ($vmtype eq 'openvz') {
		# post-suspend rsync
		$plugin->copy_data_phase2 ($task, $vmid);

		debugmsg ('info', "resume vm", $logfd);
		$cleanup->{resume} = 0;
		$self->run_hook_script ('pre-restart', $task, $logfd);
		$plugin->resume_vm ($task, $vmid);
		my $delay = time () - $vmstoptime;
		debugmsg ('info', "vm is online again after $delay seconds", $logfd);
	    }

	} elsif ($mode eq 'snapshot') {

	    $self->run_hook_script ('backup-start', $task, $logfd);

	    my $snapshot_count = $task->{snapshot_count} || 0;

	    $self->run_hook_script ('pre-stop', $task, $logfd);

	    if ($snapshot_count > 1) {
		debugmsg ('info', "suspend vm to make snapshot", $logfd);
		$vmstoptime = time ();
		$plugin->suspend_vm ($task, $vmid);
		$cleanup->{resume} = 1;
	    }

	    $plugin->snapshot ($task, $vmid);

	    $self->run_hook_script ('pre-restart', $task, $logfd);

	    if ($snapshot_count > 1) {
		debugmsg ('info', "resume vm", $logfd);
		$cleanup->{resume} = 0;
		$plugin->resume_vm ($task, $vmid);
		my $delay = time () - $vmstoptime;
		debugmsg ('info', "vm is online again after $delay seconds", $logfd);
	    }

	} else {
	    die "internal error - unknown mode '$mode'\n";
	}

	# assemble archive image
	$plugin->assemble ($task, $vmid);
	
	# produce archive 

	if ($opts->{stdout}) {
	    debugmsg ('info', "sending archive to stdout", $logfd);
	    $plugin->archive($task, $vmid, $task->{tmptar}, $comp);
	    $self->run_hook_script ('backup-end', $task, $logfd);
	    return;
	}

	debugmsg ('info', "creating archive '$task->{tarfile}'", $logfd);
	$plugin->archive($task, $vmid, $task->{tmptar}, $comp);

	rename ($task->{tmptar}, $task->{tarfile}) ||
	    die "unable to rename '$task->{tmptar}' to '$task->{tarfile}'\n";

	# determine size
	$task->{size} = (-s $task->{tarfile}) || 0;
	my $cs = format_size ($task->{size}); 
	debugmsg ('info', "archive file size: $cs", $logfd);

	# purge older backup

	if ($maxfiles && $opts->{remove}) {
	    my $bklist = get_backup_file_list($opts->{dumpdir}, $bkname, $task->{tarfile});
	    $bklist = [ sort { $b->[1] <=> $a->[1] } @$bklist ];

	    while (scalar (@$bklist) >= $maxfiles) {
		my $d = pop @$bklist;
		debugmsg ('info', "delete old backup '$d->[0]'", $logfd);
		unlink $d->[0];
		my $logfn = $d->[0];
		$logfn =~ s/\.(tgz|((tar|vma)(\.(gz|lzo))?))$/\.log/;
		unlink $logfn;
	    }
	}

	$self->run_hook_script ('backup-end', $task, $logfd);
    };
    my $err = $@;

    if ($plugin) {
	# clean-up

	if ($cleanup->{unlock}) {
	    eval { $plugin->unlock_vm ($vmid); };
	    warn $@ if $@;
	}

	eval { $plugin->cleanup ($task, $vmid) };
	warn $@ if $@;

	eval { $plugin->set_logfd (undef); };
	warn $@ if $@;

	if ($cleanup->{resume} || $cleanup->{restart}) {	
	    eval { 
		$self->run_hook_script ('pre-restart', $task, $logfd);
		if ($cleanup->{resume}) {
		    debugmsg ('info', "resume vm", $logfd);
		    $plugin->resume_vm ($task, $vmid);
		} else {
		    my $running = $plugin->vm_status($vmid);
		    if (!$running) {
			debugmsg ('info', "restarting vm", $logfd);
			$plugin->start_vm ($task, $vmid);
		    }
		} 
	    };
	    my $err = $@;
	    if ($err) {
		warn $err;
	    } else {
		my $delay = time () - $vmstoptime;
		debugmsg ('info', "vm is online again after $delay seconds", $logfd);
	    }
	}
    }

    eval { unlink $task->{tmptar} if $task->{tmptar} && -f $task->{tmptar}; };
    warn $@ if $@;

    eval { rmtree $task->{tmpdir} if $task->{tmpdir} && -d $task->{tmpdir}; };
    warn $@ if $@;

    my $delay = $task->{backuptime} = time () - $vmstarttime;

    if ($err) {
	$task->{state} = 'err';
	$task->{msg} = $err;
	debugmsg ('err', "Backup of VM $vmid failed - $err", $logfd, 1);

	eval { $self->run_hook_script ('backup-abort', $task, $logfd); };

    } else {
	$task->{state} = 'ok';
	my $tstr = format_time ($delay);
	debugmsg ('info', "Finished Backup of VM $vmid ($tstr)", $logfd, 1);
    }

    close ($logfd) if $logfd;
    
    if ($task->{tmplog} && $task->{logfile}) {
	system ("cp '$task->{tmplog}' '$task->{logfile}'");
    }

    eval { $self->run_hook_script ('log-end', $task); };

    die $err if $err && $err =~ m/^interrupted by signal$/;
}

sub exec_backup {
    my ($self, $rpcenv, $authuser) = @_;

    my $opts = $self->{opts};

    debugmsg ('info', "starting new backup job: $self->{cmdline}", undef, 1);
    debugmsg ('info', "skip external VMs: " . join(', ', @{$self->{skiplist}}))
	if scalar(@{$self->{skiplist}});
 
    my $tasklist = [];

    if ($opts->{all}) {
	foreach my $plugin (@{$self->{plugins}}) {
	    my $vmlist = $plugin->vmlist();
	    foreach my $vmid (sort @$vmlist) {
		next if grep { $_ eq  $vmid } @{$opts->{exclude}};
		next if !$rpcenv->check($authuser, "/vms/$vmid", [ 'VM.Backup' ], 1);
	        push @$tasklist, { vmid => $vmid,  state => 'todo', plugin => $plugin };
	    }
	}
    } else {
	foreach my $vmid (sort @{$opts->{vmids}}) {
	    my $plugin;
	    foreach my $pg (@{$self->{plugins}}) {
		my $vmlist = $pg->vmlist();
		if (grep { $_ eq  $vmid } @$vmlist) {
		    $plugin = $pg;
		    last;
		}
	    }
	    $rpcenv->check($authuser, "/vms/$vmid", [ 'VM.Backup' ]);
	    push @$tasklist, { vmid => $vmid,  state => 'todo', plugin => $plugin };
	}
    }

    my $starttime = time();
    my $errcount = 0;
    eval {

	$self->run_hook_script ('job-start');

	foreach my $task (@$tasklist) {
	    $self->exec_backup_task ($task);
	    $errcount += 1 if $task->{state} ne 'ok';
	}

	$self->run_hook_script ('job-end');    
    };
    my $err = $@;

    $self->run_hook_script ('job-abort') if $err;    

    if ($err) {
	debugmsg ('err', "Backup job failed - $err", undef, 1);
    } else {
	if ($errcount) {
	    debugmsg ('info', "Backup job finished with errors", undef, 1);
	} else {
	    debugmsg ('info', "Backup job finished successfully", undef, 1);
	}
    }

    my $totaltime = time() - $starttime;

    eval { $self->sendmail ($tasklist, $totaltime); };
    debugmsg ('err', $@) if $@;

    die $err if $err;

    die "job errors\n" if $errcount; 
}

my $confdesc = {
    vmid => {
	type => 'string', format => 'pve-vmid-list',		
	description => "The ID of the VM you want to backup.",
	optional => 1,
    },
    node => get_standard_option('pve-node', { 
	description => "Only run if executed on this node.",
	optional => 1,
    }),
    all => {
	type => 'boolean',
	description => "Backup all known VMs on this host.",
	optional => 1,
	default => 0,
    },
    stdexcludes => {
	type => 'boolean',
	description => "Exclude temorary files and logs.",
	optional => 1,
	default => 1,
    },
    compress => {
	type => 'string',
	description => "Compress dump file.",
	optional => 1,
	enum => ['0', '1', 'gzip', 'lzo'],
	default => 'lzo',
    },
    quiet => {
	type => 'boolean',
	description => "Be quiet.",
	optional => 1,
	default => 0,
    },
    mode => {
	type => 'string',
	description => "Backup mode.",
	optional => 1,
	default => 'stop',
	enum => [ 'snapshot', 'suspend', 'stop' ],
    },
    exclude => {
	type => 'string', format => 'pve-vmid-list',
	description => "exclude specified VMs (assumes --all)",
	optional => 1,
    },
    'exclude-path' => {
	type => 'string', format => 'string-alist',
	description => "exclude certain files/directories (regex).",
	optional => 1,
    },
    mailto => {
	type => 'string', format => 'string-list',
	description => "",
	optional => 1,
    },
    tmpdir => {
	type => 'string',
	description => "Store temporary files to specified directory.",
	optional => 1,
    },
    dumpdir => {
	type => 'string',
	description => "Store resulting files to specified directory.",
	optional => 1,
    },
    script => {
	type => 'string',
	description => "Use specified hook script.",
	optional => 1,
    },
    storage => get_standard_option('pve-storage-id', {
	description => "Store resulting file to this storage.",
	optional => 1,
    }),
    size => {
	type => 'integer',
	description => "LVM snapshot size im MB.",
	optional => 1,
	minimum => 500,
    },
    bwlimit => {
	type => 'integer',
	description => "Limit I/O bandwidth (KBytes per second).",
	optional => 1,
	minimum => 0,
    },
    ionice => {
	type => 'integer',
	description => "Set CFQ ionice priority.",
	optional => 1,
	minimum => 0,
	maximum => 8,
    },
    lockwait => {
	type => 'integer',
	description => "Maximal time to wait for the global lock (minutes).",
	optional => 1,
	minimum => 0,
    },
    stopwait => {
	type => 'integer',
	description => "Maximal time to wait until a VM is stopped (minutes).",
	optional => 1,
	minimum => 0,
    },
    maxfiles => {
	type => 'integer',
	description => "Maximal number of backup files per VM.",
	optional => 1,
	minimum => 1,
    },
    remove => {
	type => 'boolean',
	description => "Remove old backup files if there are more than 'maxfiles' backup files.",
	optional => 1,
	default => 1,
    },
};

sub option_exists {
    my $key = shift;
    return defined($confdesc->{$key});
}

# add JSON properties for create and set function
sub json_config_properties {
    my $prop = shift;

    foreach my $opt (keys %$confdesc) {
	$prop->{$opt} = $confdesc->{$opt};
    }

    return $prop;
}

sub verify_vzdump_parameters {
    my ($param, $check_missing) = @_;

    raise_param_exc({ all => "option conflicts with option 'vmid'"})
	if $param->{all} && $param->{vmid};

    raise_param_exc({ exclude => "option conflicts with option 'vmid'"})
	if $param->{exclude} && $param->{vmid};

    $param->{all} = 1 if defined($param->{exclude});

    return if !$check_missing;

    raise_param_exc({ vmid => "property is missing"})
	if !$param->{all} && !$param->{vmid};

}

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

    my $cmd = "vzdump";

    if ($param->{vmid}) {
	$cmd .= " " . join(' ', PVE::Tools::split_list($param->{vmid}));
    }

    foreach my $p (keys %$param) {
	next if $p eq 'id' || $p eq 'vmid' || $p eq 'starttime' || $p eq 'dow' || $p eq 'stdout';
	my $v = $param->{$p};
	my $pd = $confdesc->{$p} || die "no such vzdump option '$p'\n";
	if ($p eq 'exclude-path') {
	    foreach my $path (split(/\0/, $v || '')) {
		$cmd .= " --$p " . PVE::Tools::shellquote($path);
	    }
	} else {
	    $cmd .= " --$p " . PVE::Tools::shellquote($v) if defined($v) && $v ne '';
	}
    }

    return $cmd;
}

1;