Don't apply snapshot config in snapshot_commit

[pve-container.git] / src / PVE / LXC.pm

package PVE::LXC;

use strict;
use warnings;
use POSIX qw(EINTR);

use Socket;

use File::Path;
use File::Spec;
use Cwd qw();
use Fcntl qw(O_RDONLY);

use PVE::Cluster qw(cfs_register_file cfs_read_file);
use PVE::Exception qw(raise_perm_exc);
use PVE::Storage;
use PVE::SafeSyslog;
use PVE::INotify;
use PVE::JSONSchema qw(get_standard_option);
use PVE::Tools qw($IPV6RE $IPV4RE dir_glob_foreach lock_file lock_file_full);
use PVE::Network;
use PVE::AccessControl;
use PVE::ProcFSTools;
use Time::HiRes qw (gettimeofday);

use Data::Dumper;

my $nodename = PVE::INotify::nodename();

my $cpuinfo= PVE::ProcFSTools::read_cpuinfo();

our $COMMON_TAR_FLAGS = [ '--sparse', '--numeric-owner', '--acls',
                          '--xattrs',
                          '--xattrs-include=user.*',
                          '--xattrs-include=security.capability',
                          '--warning=no-xattr-write' ];

cfs_register_file('/lxc/', \&parse_pct_config, \&write_pct_config);

my $rootfs_desc = {
    volume => {
	type => 'string',
	default_key => 1,
	format => 'pve-lxc-mp-string',
	format_description => 'volume',
	description => 'Volume, device or directory to mount into the container.',
    },
    backup => {
	type => 'boolean',
	format_description => '[1|0]',
	description => 'Whether to include the mountpoint in backups.',
	optional => 1,
    },
    size => {
	type => 'string',
	format => 'disk-size',
	format_description => 'DiskSize',
	description => 'Volume size (read only value).',
	optional => 1,
    },
    acl => {
	type => 'boolean',
	format_description => 'acl',
	description => 'Explicitly enable or disable ACL support.',
	optional => 1,
    },
    ro => {
	type => 'boolean',
	format_description => 'ro',
	description => 'Read-only mountpoint (not supported with bind mounts)',
	optional => 1,
    },
    quota => {
	type => 'boolean',
	format_description => '[0|1]',
	description => 'Enable user quotas inside the container (not supported with zfs subvolumes)',
	optional => 1,
    },
};

PVE::JSONSchema::register_standard_option('pve-ct-rootfs', {
    type => 'string', format => $rootfs_desc,
    description => "Use volume as container root.",
    optional => 1,
});

PVE::JSONSchema::register_standard_option('pve-lxc-snapshot-name', {
    description => "The name of the snapshot.",
    type => 'string', format => 'pve-configid',
    maxLength => 40,
});

my $confdesc = {
    lock => {
	optional => 1,
	type => 'string',
	description => "Lock/unlock the VM.",
	enum => [qw(migrate backup snapshot rollback)],
    },
    onboot => {
	optional => 1,
	type => 'boolean',
	description => "Specifies whether a VM will be started during system bootup.",
	default => 0,
    },
    startup => get_standard_option('pve-startup-order'),
    template => {
	optional => 1,
	type => 'boolean',
	description => "Enable/disable Template.",
	default => 0,
    },
    arch => {
	optional => 1,
	type => 'string',
	enum => ['amd64', 'i386'],
	description => "OS architecture type.",
	default => 'amd64',
    },
    ostype => {
	optional => 1,
	type => 'string',
	enum => ['debian', 'ubuntu', 'centos', 'fedora', 'opensuse', 'archlinux', 'alpine', 'unmanaged'],
	description => "OS type. This is used to setup configuration inside the container, and corresponds to lxc setup scripts in /usr/share/lxc/config/<ostype>.common.conf. Value 'unmanaged' can be used to skip and OS specific setup.",
    },
    console => {
	optional => 1,
	type => 'boolean',
	description => "Attach a console device (/dev/console) to the container.",
	default => 1,
    },
    tty => {
	optional => 1,
	type => 'integer',
	description => "Specify the number of tty available to the container",
	minimum => 0,
	maximum => 6,
	default => 2,
    },
    cpulimit => {
	optional => 1,
	type => 'number',
	description => "Limit of CPU usage. Note if the computer has 2 CPUs, it has a total of '2' CPU time. Value '0' indicates no CPU limit.",
	minimum => 0,
	maximum => 128,
	default => 0,
    },
    cpuunits => {
	optional => 1,
	type => 'integer',
	description => "CPU weight for a VM. Argument is used in the kernel fair scheduler. The larger the number is, the more CPU time this VM gets. Number is relative to the weights of all the other running VMs.\n\nNOTE: You can disable fair-scheduler configuration by setting this to 0.",
	minimum => 0,
	maximum => 500000,
	default => 1024,
    },
    memory => {
	optional => 1,
	type => 'integer',
	description => "Amount of RAM for the VM in MB.",
	minimum => 16,
	default => 512,
    },
    swap => {
	optional => 1,
	type => 'integer',
	description => "Amount of SWAP for the VM in MB.",
	minimum => 0,
	default => 512,
    },
    hostname => {
	optional => 1,
	description => "Set a host name for the container.",
	type => 'string', format => 'dns-name',
	maxLength => 255,
    },
    description => {
	optional => 1,
	type => 'string',
	description => "Container description. Only used on the configuration web interface.",
    },
    searchdomain => {
	optional => 1,
	type => 'string', format => 'dns-name-list',
	description => "Sets DNS search domains for a container. Create will automatically use the setting from the host if you neither set searchdomain nor nameserver.",
    },
    nameserver => {
	optional => 1,
	type => 'string', format => 'address-list',
	description => "Sets DNS server IP address for a container. Create will automatically use the setting from the host if you neither set searchdomain nor nameserver.",
    },
    rootfs => get_standard_option('pve-ct-rootfs'),
    parent => {
	optional => 1,
	type => 'string', format => 'pve-configid',
	maxLength => 40,
	description => "Parent snapshot name. This is used internally, and should not be modified.",
    },
    snaptime => {
	optional => 1,
	description => "Timestamp for snapshots.",
	type => 'integer',
	minimum => 0,
    },
    cmode => {
	optional => 1,
	description => "Console mode. By default, the console command tries to open a connection to one of the available tty devices. By setting cmode to 'console' it tries to attach to /dev/console instead. If you set cmode to 'shell', it simply invokes a shell inside the container (no login).",
	type => 'string',
	enum => ['shell', 'console', 'tty'],
	default => 'tty',
    },
    protection => {
	optional => 1,
	type => 'boolean',
	description => "Sets the protection flag of the container. This will prevent the CT or CT's disk remove/update operation.",
	default => 0,
    },
    unprivileged => {
	optional => 1,
	type => 'boolean',
	description => "Makes the container run as unprivileged user. (Should not be modified manually.)",
	default => 0,
    },
};

my $valid_lxc_conf_keys = {
    'lxc.include' => 1,
    'lxc.arch' => 1,
    'lxc.utsname' => 1,
    'lxc.haltsignal' => 1,
    'lxc.rebootsignal' => 1,
    'lxc.stopsignal' => 1,
    'lxc.init_cmd' => 1,
    'lxc.network.type' => 1,
    'lxc.network.flags' => 1,
    'lxc.network.link' => 1,
    'lxc.network.mtu' => 1,
    'lxc.network.name' => 1,
    'lxc.network.hwaddr' => 1,
    'lxc.network.ipv4' => 1,
    'lxc.network.ipv4.gateway' => 1,
    'lxc.network.ipv6' => 1,
    'lxc.network.ipv6.gateway' => 1,
    'lxc.network.script.up' => 1,
    'lxc.network.script.down' => 1,
    'lxc.pts' => 1,
    'lxc.console.logfile' => 1,
    'lxc.console' => 1,
    'lxc.tty' => 1,
    'lxc.devttydir' => 1,
    'lxc.hook.autodev' => 1,
    'lxc.autodev' => 1,
    'lxc.kmsg' => 1,
    'lxc.mount' => 1,
    'lxc.mount.entry' => 1,
    'lxc.mount.auto' => 1,
    'lxc.rootfs' => 'lxc.rootfs is auto generated from rootfs',
    'lxc.rootfs.mount' => 1,
    'lxc.rootfs.options' => 'lxc.rootfs.options is not supported' .
                            ', please use mountpoint options in the "rootfs" key',
    # lxc.cgroup.*
    'lxc.cap.drop' => 1,
    'lxc.cap.keep' => 1,
    'lxc.aa_profile' => 1,
    'lxc.aa_allow_incomplete' => 1,
    'lxc.se_context' => 1,
    'lxc.seccomp' => 1,
    'lxc.id_map' => 1,
    'lxc.hook.pre-start' => 1,
    'lxc.hook.pre-mount' => 1,
    'lxc.hook.mount' => 1,
    'lxc.hook.start' => 1,
    'lxc.hook.stop' => 1,
    'lxc.hook.post-stop' => 1,
    'lxc.hook.clone' => 1,
    'lxc.hook.destroy' => 1,
    'lxc.loglevel' => 1,
    'lxc.logfile' => 1,
    'lxc.start.auto' => 1,
    'lxc.start.delay' => 1,
    'lxc.start.order' => 1,
    'lxc.group' => 1,
    'lxc.environment' => 1,
};

my $netconf_desc = {
    type => {
	type => 'string',
	optional => 1,
	description => "Network interface type.",
	enum => [qw(veth)],
    },
    name => {
	type => 'string',
	format_description => 'String',
	description => 'Name of the network device as seen from inside the container. (lxc.network.name)',
	pattern => '[-_.\w\d]+',
    },
    bridge => {
	type => 'string',
	format_description => 'vmbr<Number>',
	description => 'Bridge to attach the network device to.',
	pattern => '[-_.\w\d]+',
	optional => 1,
    },
    hwaddr => {
	type => 'string',
	format_description => 'MAC',
	description => 'Bridge to attach the network device to. (lxc.network.hwaddr)',
	pattern => qr/(?:[a-f0-9]{2}:){5}[a-f0-9]{2}/i,
	optional => 1,
    },
    mtu => {
	type => 'integer',
	format_description => 'Number',
	description => 'Maximum transfer unit of the interface. (lxc.network.mtu)',
	minimum => 64, # minimum ethernet frame is 64 bytes
	optional => 1,
    },
    ip => {
	type => 'string',
	format => 'pve-ipv4-config',
	format_description => 'IPv4Format/CIDR',
	description => 'IPv4 address in CIDR format.',
	optional => 1,
    },
    gw => {
	type => 'string',
	format => 'ipv4',
	format_description => 'GatewayIPv4',
	description => 'Default gateway for IPv4 traffic.',
	optional => 1,
    },
    ip6 => {
	type => 'string',
	format => 'pve-ipv6-config',
	format_description => 'IPv6Format/CIDR',
	description => 'IPv6 address in CIDR format.',
	optional => 1,
    },
    gw6 => {
	type => 'string',
	format => 'ipv6',
	format_description => 'GatewayIPv6',
	description => 'Default gateway for IPv6 traffic.',
	optional => 1,
    },
    firewall => {
	type => 'boolean',
	format_description => '[1|0]',
	description => "Controls whether this interface's firewall rules should be used.",
	optional => 1,
    },
    tag => {
	type => 'integer',
	format_description => 'VlanNo',
	minimum => '2',
	maximum => '4094',
	description => "VLAN tag for this interface.",
	optional => 1,
    },
    trunks => {
	type => 'string',
	pattern => qr/\d+(?:;\d+)*/,
	format_description => 'vlanid[;vlanid...]',
	description => "VLAN ids to pass through the interface",
	optional => 1,
    },
};
PVE::JSONSchema::register_format('pve-lxc-network', $netconf_desc);

my $MAX_LXC_NETWORKS = 10;
for (my $i = 0; $i < $MAX_LXC_NETWORKS; $i++) {
    $confdesc->{"net$i"} = {
	optional => 1,
	type => 'string', format => $netconf_desc,
	description => "Specifies network interfaces for the container.",
    };
}

PVE::JSONSchema::register_format('pve-lxc-mp-string', \&verify_lxc_mp_string);
sub verify_lxc_mp_string{
    my ($mp, $noerr) = @_;

    # do not allow:
    # /./ or /../ 
    # /. or /.. at the end
    # ../ at the beginning
    
    if($mp =~ m@/\.\.?/@ ||
       $mp =~ m@/\.\.?$@ ||
       $mp =~ m@^\.\./@){
	return undef if $noerr;
	die "$mp contains illegal character sequences\n";
    }
    return $mp;
}

my $mp_desc = {
    %$rootfs_desc,
    mp => {
	type => 'string',
	format => 'pve-lxc-mp-string',
	format_description => 'Path',
	description => 'Path to the mountpoint as seen from inside the container.',
    },
};
PVE::JSONSchema::register_format('pve-ct-mountpoint', $mp_desc);

my $unuseddesc = {
    optional => 1,
    type => 'string', format => 'pve-volume-id',
    description => "Reference to unused volumes.",
};

my $MAX_MOUNT_POINTS = 10;
for (my $i = 0; $i < $MAX_MOUNT_POINTS; $i++) {
    $confdesc->{"mp$i"} = {
	optional => 1,
	type => 'string', format => $mp_desc,
	description => "Use volume as container mount point (experimental feature).",
	optional => 1,
    };
}

my $MAX_UNUSED_DISKS = $MAX_MOUNT_POINTS;
for (my $i = 0; $i < $MAX_MOUNT_POINTS; $i++) {
    $confdesc->{"unused$i"} = $unuseddesc;
}

sub write_pct_config {
    my ($filename, $conf) = @_;

    delete $conf->{snapstate}; # just to be sure

    my $generate_raw_config = sub {
	my ($conf) = @_;

	my $raw = '';

	# add description as comment to top of file
	my $descr = $conf->{description} || '';
	foreach my $cl (split(/\n/, $descr)) {
	    $raw .= '#' .  PVE::Tools::encode_text($cl) . "\n";
	}

	foreach my $key (sort keys %$conf) {
	    next if $key eq 'digest' || $key eq 'description' || $key eq 'pending' || 
		$key eq 'snapshots' || $key eq 'snapname' || $key eq 'lxc';
	    my $value = $conf->{$key};
	    die "detected invalid newline inside property '$key'\n" if $value =~ m/\n/;
	    $raw .= "$key: $value\n";
	}

	if (my $lxcconf = $conf->{lxc}) {
	    foreach my $entry (@$lxcconf) {
		my ($k, $v) = @$entry;
		$raw .= "$k: $v\n";
	    }
	}
	
	return $raw;
    };

    my $raw = &$generate_raw_config($conf);

    foreach my $snapname (sort keys %{$conf->{snapshots}}) {
	$raw .= "\n[$snapname]\n";
	$raw .= &$generate_raw_config($conf->{snapshots}->{$snapname});
    }

    return $raw;
}

sub check_type {
    my ($key, $value) = @_;

    die "unknown setting '$key'\n" if !$confdesc->{$key};

    my $type = $confdesc->{$key}->{type};

    if (!defined($value)) {
	die "got undefined value\n";
    }

    if ($value =~ m/[\n\r]/) {
	die "property contains a line feed\n";
    }

    if ($type eq 'boolean') {
	return 1 if ($value eq '1') || ($value =~ m/^(on|yes|true)$/i);
	return 0 if ($value eq '0') || ($value =~ m/^(off|no|false)$/i);
	die "type check ('boolean') failed - got '$value'\n";
    } elsif ($type eq 'integer') {
	return int($1) if $value =~ m/^(\d+)$/;
	die "type check ('integer') failed - got '$value'\n";
    } elsif ($type eq 'number') {
        return $value if $value =~ m/^(\d+)(\.\d+)?$/;
        die "type check ('number') failed - got '$value'\n";
    } elsif ($type eq 'string') {
	if (my $fmt = $confdesc->{$key}->{format}) {
	    PVE::JSONSchema::check_format($fmt, $value);
	    return $value;
	}
	return $value;
    } else {
	die "internal error"
    }
}

sub parse_pct_config {
    my ($filename, $raw) = @_;

    return undef if !defined($raw);

    my $res = {
	digest => Digest::SHA::sha1_hex($raw),
	snapshots => {},
    };

    $filename =~ m|/lxc/(\d+).conf$|
	|| die "got strange filename '$filename'";

    my $vmid = $1;

    my $conf = $res;
    my $descr = '';
    my $section = '';

    my @lines = split(/\n/, $raw);
    foreach my $line (@lines) {
	next if $line =~ m/^\s*$/;

	if ($line =~ m/^\[([a-z][a-z0-9_\-]+)\]\s*$/i) {
	    $section = $1;
	    $conf->{description} = $descr if $descr;
	    $descr = '';
	    $conf = $res->{snapshots}->{$section} = {};
	    next;
	}

	if ($line =~ m/^\#(.*)\s*$/) {
	    $descr .= PVE::Tools::decode_text($1) . "\n";
	    next;
	}

	if ($line =~ m/^(lxc\.[a-z0-9_\-\.]+)(:|\s*=)\s*(.*?)\s*$/) {
	    my $key = $1;
	    my $value = $3;
	    my $validity = $valid_lxc_conf_keys->{$key} || 0;
	    if ($validity eq 1 || $key =~ m/^lxc\.cgroup\./) {
		push @{$conf->{lxc}}, [$key, $value];
	    } elsif (my $errmsg = $validity) {
		warn "vm $vmid - $key: $errmsg\n";
	    } else {
		warn "vm $vmid - unable to parse config: $line\n";
	    }
	} elsif ($line =~ m/^(description):\s*(.*\S)\s*$/) {
	    $descr .= PVE::Tools::decode_text($2);
	} elsif ($line =~ m/snapstate:\s*(prepare|delete)\s*$/) {
	    $conf->{snapstate} = $1;
	} elsif ($line =~ m/^([a-z][a-z_]*\d*):\s*(\S.*)\s*$/) {
	    my $key = $1;
	    my $value = $2;
	    eval { $value = check_type($key, $value); };
	    warn "vm $vmid - unable to parse value of '$key' - $@" if $@;
	    $conf->{$key} = $value;
	} else {
	    warn "vm $vmid - unable to parse config: $line\n";
	}
    }

    $conf->{description} = $descr if $descr;

    delete $res->{snapstate}; # just to be sure

    return $res;
}

sub config_list {
    my $vmlist = PVE::Cluster::get_vmlist();
    my $res = {};
    return $res if !$vmlist || !$vmlist->{ids};
    my $ids = $vmlist->{ids};

    foreach my $vmid (keys %$ids) {
	next if !$vmid; # skip CT0
	my $d = $ids->{$vmid};
	next if !$d->{node} || $d->{node} ne $nodename;
	next if !$d->{type} || $d->{type} ne 'lxc';
	$res->{$vmid}->{type} = 'lxc';
    }
    return $res;
}

sub cfs_config_path {
    my ($vmid, $node) = @_;

    $node = $nodename if !$node;
    return "nodes/$node/lxc/$vmid.conf";
}

sub config_file {
    my ($vmid, $node) = @_;

    my $cfspath = cfs_config_path($vmid, $node);
    return "/etc/pve/$cfspath";
}

sub load_config {
    my ($vmid, $node) = @_;

    $node = $nodename if !$node;
    my $cfspath = cfs_config_path($vmid, $node);

    my $conf = PVE::Cluster::cfs_read_file($cfspath);
    die "container $vmid does not exist\n" if !defined($conf);

    return $conf;
}

sub create_config {
    my ($vmid, $conf) = @_;

    my $dir = "/etc/pve/nodes/$nodename/lxc";
    mkdir $dir;

    write_config($vmid, $conf);
}

sub destroy_config {
    my ($vmid) = @_;

    unlink config_file($vmid, $nodename);
}

sub write_config {
    my ($vmid, $conf) = @_;

    my $cfspath = cfs_config_path($vmid);

    PVE::Cluster::cfs_write_file($cfspath, $conf);
}

# flock: we use one file handle per process, so lock file
# can be called multiple times and will succeed for the same process.

my $lock_handles =  {};
my $lockdir = "/run/lock/lxc";

sub config_file_lock {
    my ($vmid) = @_;

    return "$lockdir/pve-config-${vmid}.lock";
}

sub lock_config_full {
    my ($vmid, $timeout, $code, @param) = @_;

    my $filename = config_file_lock($vmid);

    mkdir $lockdir if !-d $lockdir;

    my $res = lock_file($filename, $timeout, $code, @param);

    die $@ if $@;

    return $res;
}

sub lock_config_mode {
    my ($vmid, $timeout, $shared, $code, @param) = @_;

    my $filename = config_file_lock($vmid);

    mkdir $lockdir if !-d $lockdir;

    my $res = lock_file_full($filename, $timeout, $shared, $code, @param);

    die $@ if $@;

    return $res;
}

sub lock_config {
    my ($vmid, $code, @param) = @_;

    return lock_config_full($vmid, 10, $code, @param);
}

sub option_exists {
    my ($name) = @_;

    return defined($confdesc->{$name});
}

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

    foreach my $opt (keys %$confdesc) {
	next if $opt eq 'parent' || $opt eq 'snaptime';
	next if $prop->{$opt};
	$prop->{$opt} = $confdesc->{$opt};
    }

    return $prop;
}

# container status helpers

sub list_active_containers {

    my $filename = "/proc/net/unix";

    # similar test is used by lcxcontainers.c: list_active_containers
    my $res = {};

    my $fh = IO::File->new ($filename, "r");
    return $res if !$fh;

    while (defined(my $line = <$fh>)) {
 	if ($line =~ m/^[a-f0-9]+:\s\S+\s\S+\s\S+\s\S+\s\S+\s\d+\s(\S+)$/) {
	    my $path = $1;
	    if ($path =~ m!^@/var/lib/lxc/(\d+)/command$!) {
		$res->{$1} = 1;
	    }
	}
    }

    close($fh);

    return $res;
}

# warning: this is slow
sub check_running {
    my ($vmid) = @_;

    my $active_hash = list_active_containers();

    return 1 if defined($active_hash->{$vmid});

    return undef;
}

sub get_container_disk_usage {
    my ($vmid, $pid) = @_;

    return PVE::Tools::df("/proc/$pid/root/", 1);
}

my $last_proc_vmid_stat;

my $parse_cpuacct_stat = sub {
    my ($vmid) = @_;

    my $raw = read_cgroup_value('cpuacct', $vmid, 'cpuacct.stat', 1);

    my $stat = {};

    if ($raw =~ m/^user (\d+)\nsystem (\d+)\n/) {

	$stat->{utime} = $1;
	$stat->{stime} = $2;

    }

    return $stat;
};

sub vmstatus {
    my ($opt_vmid) = @_;

    my $list = $opt_vmid ? { $opt_vmid => { type => 'lxc' }} : config_list();

    my $active_hash = list_active_containers();

    my $cpucount = $cpuinfo->{cpus} || 1;

    my $cdtime = gettimeofday;

    my $uptime = (PVE::ProcFSTools::read_proc_uptime(1))[0];

    foreach my $vmid (keys %$list) {
	my $d = $list->{$vmid};

	eval { $d->{pid} = find_lxc_pid($vmid) if defined($active_hash->{$vmid}); };
	warn $@ if $@; # ignore errors (consider them stopped)

	$d->{status} = $d->{pid} ? 'running' : 'stopped';

	my $cfspath = cfs_config_path($vmid);
	my $conf = PVE::Cluster::cfs_read_file($cfspath) || {};

	$d->{name} = $conf->{'hostname'} || "CT$vmid";
	$d->{name} =~ s/[\s]//g;

	$d->{cpus} = $conf->{cpulimit} || $cpucount;

	if ($d->{pid}) {
	    my $res = get_container_disk_usage($vmid, $d->{pid});
	    $d->{disk} = $res->{used};
	    $d->{maxdisk} = $res->{total};
	} else {
	    $d->{disk} = 0;
	    # use 4GB by default ??
	    if (my $rootfs = $conf->{rootfs}) {
		my $rootinfo = parse_ct_rootfs($rootfs);
		$d->{maxdisk} = int(($rootinfo->{size} || 4)*1024*1024)*1024;
	    } else {
		$d->{maxdisk} = 4*1024*1024*1024;
	    }
	}

	$d->{mem} = 0;
	$d->{swap} = 0;
	$d->{maxmem} = ($conf->{memory}||512)*1024*1024;
	$d->{maxswap} = ($conf->{swap}//0)*1024*1024;

	$d->{uptime} = 0;
	$d->{cpu} = 0;

	$d->{netout} = 0;
	$d->{netin} = 0;

	$d->{diskread} = 0;
	$d->{diskwrite} = 0;

	$d->{template} = is_template($conf);
    }

    foreach my $vmid (keys %$list) {
	my $d = $list->{$vmid};
	my $pid = $d->{pid};

	next if !$pid; # skip stopped CTs

	my $ctime = (stat("/proc/$pid"))[10]; # 10 = ctime
	$d->{uptime} = time - $ctime; # the method lxcfs uses

	$d->{mem} = read_cgroup_value('memory', $vmid, 'memory.usage_in_bytes');
	$d->{swap} = read_cgroup_value('memory', $vmid, 'memory.memsw.usage_in_bytes') - $d->{mem};

	my $blkio_bytes = read_cgroup_value('blkio', $vmid, 'blkio.throttle.io_service_bytes', 1);
	my @bytes = split(/\n/, $blkio_bytes);
	foreach my $byte (@bytes) {
	    if (my ($key, $value) = $byte =~ /(Read|Write)\s+(\d+)/) {
		$d->{diskread} = $2 if $key eq 'Read';
		$d->{diskwrite} = $2 if $key eq 'Write';
	    }
	}

	my $pstat = &$parse_cpuacct_stat($vmid);

	my $used = $pstat->{utime} + $pstat->{stime};

	my $old = $last_proc_vmid_stat->{$vmid};
	if (!$old) {
	    $last_proc_vmid_stat->{$vmid} = {
		time => $cdtime,
		used => $used,
		cpu => 0,
	    };
	    next;
	}

	my $dtime = ($cdtime -  $old->{time}) * $cpucount * $cpuinfo->{user_hz};

	if ($dtime > 1000) {
	    my $dutime = $used -  $old->{used};

	    $d->{cpu} = (($dutime/$dtime)* $cpucount) / $d->{cpus};
	    $last_proc_vmid_stat->{$vmid} = {
		time => $cdtime,
		used => $used,
		cpu => $d->{cpu},
	    };
	} else {
	    $d->{cpu} = $old->{cpu};
	}
    }

    my $netdev = PVE::ProcFSTools::read_proc_net_dev();

    foreach my $dev (keys %$netdev) {
	next if $dev !~ m/^veth([1-9]\d*)i/;
	my $vmid = $1;
	my $d = $list->{$vmid};

	next if !$d;

	$d->{netout} += $netdev->{$dev}->{receive};
	$d->{netin} += $netdev->{$dev}->{transmit};

    }

    return $list;
}

sub classify_mountpoint {
    my ($vol) = @_;
    if ($vol =~ m!^/!) {
	return 'device' if $vol =~ m!^/dev/!;
	return 'bind';
    }
    return 'volume';
}

my $parse_ct_mountpoint_full = sub {
    my ($desc, $data, $noerr) = @_;

    $data //= '';

    my $res;
    eval { $res = PVE::JSONSchema::parse_property_string($desc, $data) };
    if ($@) {
	return undef if $noerr;
	die $@;
    }

    if (defined(my $size = $res->{size})) {
	$size = PVE::JSONSchema::parse_size($size);
	if (!defined($size)) {
	    return undef if $noerr;
	    die "invalid size: $size\n";
	}
	$res->{size} = $size;
    }

    $res->{type} = classify_mountpoint($res->{volume});

    return $res;
};

sub parse_ct_rootfs {
    my ($data, $noerr) = @_;

    my $res =  &$parse_ct_mountpoint_full($rootfs_desc, $data, $noerr);

    $res->{mp} = '/' if defined($res);

    return $res;
}

sub parse_ct_mountpoint {
    my ($data, $noerr) = @_;

    return &$parse_ct_mountpoint_full($mp_desc, $data, $noerr);
}

sub print_ct_mountpoint {
    my ($info, $nomp) = @_;
    my $skip = [ 'type' ];
    push @$skip, 'mp' if $nomp;
    return PVE::JSONSchema::print_property_string($info, $mp_desc, $skip);
}

sub print_lxc_network {
    my $net = shift;
    return PVE::JSONSchema::print_property_string($net, $netconf_desc);
}

sub parse_lxc_network {
    my ($data) = @_;

    my $res = {};

    return $res if !$data;

    $res = PVE::JSONSchema::parse_property_string($netconf_desc, $data);

    $res->{type} = 'veth';
    $res->{hwaddr} = PVE::Tools::random_ether_addr() if !$res->{hwaddr};

    return $res;
}

sub read_cgroup_value {
    my ($group, $vmid, $name, $full) = @_;

    my $path = "/sys/fs/cgroup/$group/lxc/$vmid/$name";

    return PVE::Tools::file_get_contents($path) if $full;

    return PVE::Tools::file_read_firstline($path);
}

sub write_cgroup_value {
   my ($group, $vmid, $name, $value) = @_;

   my $path = "/sys/fs/cgroup/$group/lxc/$vmid/$name";
   PVE::ProcFSTools::write_proc_entry($path, $value) if -e $path;

}

sub find_lxc_console_pids {

    my $res = {};

    PVE::Tools::dir_glob_foreach('/proc', '\d+', sub {
	my ($pid) = @_;

	my $cmdline = PVE::Tools::file_read_firstline("/proc/$pid/cmdline");
	return if !$cmdline;

	my @args = split(/\0/, $cmdline);

	# search for lxc-console -n <vmid>
	return if scalar(@args) != 3;
	return if $args[1] ne '-n';
	return if $args[2] !~ m/^\d+$/;
	return if $args[0] !~ m|^(/usr/bin/)?lxc-console$|;

	my $vmid = $args[2];

	push @{$res->{$vmid}}, $pid;
    });

    return $res;
}

sub find_lxc_pid {
    my ($vmid) = @_;

    my $pid = undef;
    my $parser = sub {
        my $line = shift;
        $pid = $1 if $line =~ m/^PID:\s+(\d+)$/;
    };
    PVE::Tools::run_command(['lxc-info', '-n', $vmid, '-p'], outfunc => $parser);

    die "unable to get PID for CT $vmid (not running?)\n" if !$pid;

    return $pid;
}

# Note: we cannot use Net:IP, because that only allows strict
# CIDR networks
sub parse_ipv4_cidr {
    my ($cidr, $noerr) = @_;

    if ($cidr =~ m!^($IPV4RE)(?:/(\d+))$! && ($2 > 7) &&  ($2 <= 32)) {
	return { address => $1, netmask => $PVE::Network::ipv4_reverse_mask->[$2] };
    }

    return undef if $noerr;

    die "unable to parse ipv4 address/mask\n";
}

sub check_lock {
    my ($conf) = @_;

    die "VM is locked ($conf->{'lock'})\n" if $conf->{'lock'};
}

sub has_lock {
    my ($conf, $lock) = @_;
    return $conf->{lock} && (!defined($lock) || $lock eq $conf->{lock});
}

sub check_protection {
    my ($vm_conf, $err_msg) = @_;

    if ($vm_conf->{protection}) {
	die "$err_msg - protection mode enabled\n";
    }
}

sub update_lxc_config {
    my ($storage_cfg, $vmid, $conf) = @_;

    my $dir = "/var/lib/lxc/$vmid";

    if ($conf->{template}) {

	unlink "$dir/config";

	return;
    }

    my $raw = '';

    die "missing 'arch' - internal error" if !$conf->{arch};
    $raw .= "lxc.arch = $conf->{arch}\n";

    my $unprivileged = $conf->{unprivileged};
    my $custom_idmap = grep { $_->[0] eq 'lxc.id_map' } @{$conf->{lxc}};

    my $ostype = $conf->{ostype} || die "missing 'ostype' - internal error";
    if ($ostype =~ /^(?:debian | ubuntu | centos | fedora | opensuse | archlinux | alpine | unmanaged)$/x) {
	my $inc ="/usr/share/lxc/config/$ostype.common.conf";
	$inc ="/usr/share/lxc/config/common.conf" if !-f $inc;
	$raw .= "lxc.include = $inc\n";
	if ($unprivileged || $custom_idmap) {
	    $inc = "/usr/share/lxc/config/$ostype.userns.conf";
	    $inc = "/usr/share/lxc/config/userns.conf" if !-f $inc;
	    $raw .= "lxc.include = $inc\n"
	}
    } else {
	die "implement me (ostype $ostype)";
    }

    # WARNING: DO NOT REMOVE this without making sure that loop device nodes
    # cannot be exposed to the container with r/w access (cgroup perms).
    # When this is enabled mounts will still remain in the monitor's namespace
    # after the container unmounted them and thus will not detach from their
    # files while the container is running!
    $raw .= "lxc.monitor.unshare = 1\n";

    # Should we read them from /etc/subuid?
    if ($unprivileged && !$custom_idmap) {
	$raw .= "lxc.id_map = u 0 100000 65536\n";
	$raw .= "lxc.id_map = g 0 100000 65536\n";
    }

    if (!has_dev_console($conf)) {
	$raw .= "lxc.console = none\n";
	$raw .= "lxc.cgroup.devices.deny = c 5:1 rwm\n";
    }

    my $ttycount = get_tty_count($conf);
    $raw .= "lxc.tty = $ttycount\n";

    # some init scripts expect a linux terminal (turnkey).
    $raw .= "lxc.environment = TERM=linux\n";
    
    my $utsname = $conf->{hostname} || "CT$vmid";
    $raw .= "lxc.utsname = $utsname\n";

    my $memory = $conf->{memory} || 512;
    my $swap = $conf->{swap} // 0;

    my $lxcmem = int($memory*1024*1024);
    $raw .= "lxc.cgroup.memory.limit_in_bytes = $lxcmem\n";

    my $lxcswap = int(($memory + $swap)*1024*1024);
    $raw .= "lxc.cgroup.memory.memsw.limit_in_bytes = $lxcswap\n";

    if (my $cpulimit = $conf->{cpulimit}) {
	$raw .= "lxc.cgroup.cpu.cfs_period_us = 100000\n";
	my $value = int(100000*$cpulimit);
	$raw .= "lxc.cgroup.cpu.cfs_quota_us = $value\n";
    }

    my $shares = $conf->{cpuunits} || 1024;
    $raw .= "lxc.cgroup.cpu.shares = $shares\n";

    my $mountpoint = parse_ct_rootfs($conf->{rootfs});

    $raw .= "lxc.rootfs = $dir/rootfs\n";

    my $netcount = 0;
    foreach my $k (keys %$conf) {
	next if $k !~ m/^net(\d+)$/;
	my $ind = $1;
	my $d = parse_lxc_network($conf->{$k});
	$netcount++;
	$raw .= "lxc.network.type = veth\n";
	$raw .= "lxc.network.veth.pair = veth${vmid}i${ind}\n";
	$raw .= "lxc.network.hwaddr = $d->{hwaddr}\n" if defined($d->{hwaddr});
	$raw .= "lxc.network.name = $d->{name}\n" if defined($d->{name});
	$raw .= "lxc.network.mtu = $d->{mtu}\n" if defined($d->{mtu});
    }

    if (my $lxcconf = $conf->{lxc}) {
	foreach my $entry (@$lxcconf) {
	    my ($k, $v) = @$entry;
	    $netcount++ if $k eq 'lxc.network.type';
	    $raw .= "$k = $v\n";
	}
    }

    $raw .= "lxc.network.type = empty\n" if !$netcount;
    
    File::Path::mkpath("$dir/rootfs");

    PVE::Tools::file_set_contents("$dir/config", $raw);
}

# verify and cleanup nameserver list (replace \0 with ' ')
sub verify_nameserver_list {
    my ($nameserver_list) = @_;

    my @list = ();
    foreach my $server (PVE::Tools::split_list($nameserver_list)) {
	PVE::JSONSchema::pve_verify_ip($server);
	push @list, $server;
    }

    return join(' ', @list);
}

sub verify_searchdomain_list {
    my ($searchdomain_list) = @_;

    my @list = ();
    foreach my $server (PVE::Tools::split_list($searchdomain_list)) {
	# todo: should we add checks for valid dns domains?
	push @list, $server;
    }

    return join(' ', @list);
}

sub is_volume_in_use {
    my ($config, $volid, $include_snapshots) = @_;
    my $used = 0;

    foreach_mountpoint($config, sub {
	my ($ms, $mountpoint) = @_;
	return if $used;
	if ($mountpoint->{type} eq 'volume' && $mountpoint->{volume} eq $volid) {
	    $used = 1;
	}
    });

    my $snapshots = $config->{snapshots};
    if ($include_snapshots && $snapshots) {
	foreach my $snap (keys %$snapshots) {
	    $used ||= is_volume_in_use($snapshots->{$snap}, $volid);
	}
    }

    return $used;
}

sub add_unused_volume {
    my ($config, $volid) = @_;

    my $key;
    for (my $ind = $MAX_UNUSED_DISKS - 1; $ind >= 0; $ind--) {
	my $test = "unused$ind";
	if (my $vid = $config->{$test}) {
	    return if $vid eq $volid; # do not add duplicates
	} else {
	    $key = $test;
	}
    }

    die "Too many unused volumes - please delete them first.\n" if !$key;

    $config->{$key} = $volid;

    return $key;
}

sub update_pct_config {
    my ($vmid, $conf, $running, $param, $delete) = @_;

    my @nohotplug;

    my $new_disks = 0;
    my @deleted_volumes;

    my $rootdir;
    if ($running) {
	my $pid = find_lxc_pid($vmid);
	$rootdir = "/proc/$pid/root";
    }

    my $hotplug_error = sub {
	if ($running) {
	    push @nohotplug, @_;
	    return 1;
	} else {
	    return 0;
	}
    };

    if (defined($delete)) {
	foreach my $opt (@$delete) {
	    if (!exists($conf->{$opt})) {
		warn "no such option: $opt\n";
		next;
	    }

	    if ($opt eq 'hostname' || $opt eq 'memory' || $opt eq 'rootfs') {
		die "unable to delete required option '$opt'\n";
	    } elsif ($opt eq 'swap') {
		delete $conf->{$opt};
		write_cgroup_value("memory", $vmid, "memory.memsw.limit_in_bytes", -1);
	    } elsif ($opt eq 'description' || $opt eq 'onboot' || $opt eq 'startup') {
		delete $conf->{$opt};
	    } elsif ($opt eq 'nameserver' || $opt eq 'searchdomain' ||
		     $opt eq 'tty' || $opt eq 'console' || $opt eq 'cmode') {
		next if $hotplug_error->($opt);
		delete $conf->{$opt};
	    } elsif ($opt =~ m/^net(\d)$/) {
		delete $conf->{$opt};
		next if !$running;
		my $netid = $1;
		PVE::Network::veth_delete("veth${vmid}i$netid");
	    } elsif ($opt eq 'protection') {
		delete $conf->{$opt};
	    } elsif ($opt =~ m/^unused(\d+)$/) {
		next if $hotplug_error->($opt);
		check_protection($conf, "can't remove CT $vmid drive '$opt'");
		push @deleted_volumes, $conf->{$opt};
		delete $conf->{$opt};
	    } elsif ($opt =~ m/^mp(\d+)$/) {
		next if $hotplug_error->($opt);
		check_protection($conf, "can't remove CT $vmid drive '$opt'");
		my $mp = parse_ct_mountpoint($conf->{$opt});
		delete $conf->{$opt};
		if ($mp->{type} eq 'volume' && !is_volume_in_use($conf, $mp->{volume})) {
		    add_unused_volume($conf, $mp->{volume});
		}
	    } elsif ($opt eq 'unprivileged') {
		die "unable to delete read-only option: '$opt'\n";
	    } else {
		die "implement me (delete: $opt)"
	    }
	    write_config($vmid, $conf) if $running;
	}
    }

    # There's no separate swap size to configure, there's memory and "total"
    # memory (iow. memory+swap). This means we have to change them together.
    my $wanted_memory = PVE::Tools::extract_param($param, 'memory');
    my $wanted_swap =  PVE::Tools::extract_param($param, 'swap');
    if (defined($wanted_memory) || defined($wanted_swap)) {

	my $old_memory = ($conf->{memory} || 512);
	my $old_swap = ($conf->{swap} || 0);

	$wanted_memory //= $old_memory;
	$wanted_swap //= $old_swap;

        my $total = $wanted_memory + $wanted_swap;
	if ($running) {
	    my $old_total = $old_memory + $old_swap;
	    if ($total > $old_total) {
		write_cgroup_value("memory", $vmid, "memory.memsw.limit_in_bytes", int($total*1024*1024));
		write_cgroup_value("memory", $vmid, "memory.limit_in_bytes", int($wanted_memory*1024*1024));
	    } else {
		write_cgroup_value("memory", $vmid, "memory.limit_in_bytes", int($wanted_memory*1024*1024));
		write_cgroup_value("memory", $vmid, "memory.memsw.limit_in_bytes", int($total*1024*1024));
	    }
	}
	$conf->{memory} = $wanted_memory;
	$conf->{swap} = $wanted_swap;

	write_config($vmid, $conf) if $running;
    }

    my $used_volids = {};

    foreach my $opt (keys %$param) {
	my $value = $param->{$opt};
	if ($opt eq 'hostname') {
	    $conf->{$opt} = $value;
	} elsif ($opt eq 'onboot') {
	    $conf->{$opt} = $value ? 1 : 0;
	} elsif ($opt eq 'startup') {
	    $conf->{$opt} = $value;
	} elsif ($opt eq 'tty' || $opt eq 'console' || $opt eq 'cmode') {
	    next if $hotplug_error->($opt);
	    $conf->{$opt} = $value;
	} elsif ($opt eq 'nameserver') {
	    next if $hotplug_error->($opt);
	    my $list = verify_nameserver_list($value);
	    $conf->{$opt} = $list;
	} elsif ($opt eq 'searchdomain') {
	    next if $hotplug_error->($opt);
	    my $list = verify_searchdomain_list($value);
	    $conf->{$opt} = $list;
	} elsif ($opt eq 'cpulimit') {
	    next if $hotplug_error->($opt); # FIXME: hotplug
	    $conf->{$opt} = $value;
	} elsif ($opt eq 'cpuunits') {
	    $conf->{$opt} = $value;
	    write_cgroup_value("cpu", $vmid, "cpu.shares", $value);
	} elsif ($opt eq 'description') {
	    $conf->{$opt} = PVE::Tools::encode_text($value);
	} elsif ($opt =~ m/^net(\d+)$/) {
	    my $netid = $1;
	    my $net = parse_lxc_network($value);
	    if (!$running) {
		$conf->{$opt} = print_lxc_network($net);
	    } else {
		update_net($vmid, $conf, $opt, $net, $netid, $rootdir);
	    }
	} elsif ($opt eq 'protection') {
	    $conf->{$opt} = $value ? 1 : 0;
        } elsif ($opt =~ m/^mp(\d+)$/) {
	    next if $hotplug_error->($opt);
	    check_protection($conf, "can't update CT $vmid drive '$opt'");
	    my $old = $conf->{$opt};
	    $conf->{$opt} = $value;
	    if (defined($old)) {
		my $mp = parse_ct_mountpoint($old);
		if ($mp->{type} eq 'volume' && !is_volume_in_use($conf, $mp->{volume})) {
		    add_unused_volume($conf, $mp->{volume});
		}
	    }
	    $new_disks = 1;
	    my $mp = parse_ct_mountpoint($value);
	    $used_volids->{$mp->{volume}} = 1;
        } elsif ($opt eq 'rootfs') {
	    next if $hotplug_error->($opt);
	    check_protection($conf, "can't update CT $vmid drive '$opt'");
	    my $old = $conf->{$opt};
	    $conf->{$opt} = $value;
	    if (defined($old)) {
		my $mp = parse_ct_rootfs($old);
		if ($mp->{type} eq 'volume' && !is_volume_in_use($conf, $mp->{volume})) {
		    add_unused_volume($conf, $mp->{volume});
		}
	    }
	    my $mp = parse_ct_rootfs($value);
	    $used_volids->{$mp->{volume}} = 1;
	} elsif ($opt eq 'unprivileged') {
	    die "unable to modify read-only option: '$opt'\n";
	} elsif ($opt eq 'ostype') {
	    next if $hotplug_error->($opt);
	    $conf->{$opt} = $value;
	} else {
	    die "implement me: $opt";
	}
	write_config($vmid, $conf) if $running;
    }

    # Cleanup config:

    # Remove unused disks after re-adding
    foreach my $key (keys %$conf) {
	next if $key !~ /^unused\d+/;
	my $volid = $conf->{$key};
	if ($used_volids->{$volid}) {
	    delete $conf->{$key};
	}
    }

    # Apply deletions and creations of new volumes
    if (@deleted_volumes) {
	my $storage_cfg = PVE::Storage::config();
	foreach my $volume (@deleted_volumes) {
	    next if $used_volids->{$volume}; # could have been re-added, too
	    # also check for references in snapshots
	    next if is_volume_in_use($conf, $volume, 1);
	    delete_mountpoint_volume($storage_cfg, $vmid, $volume);
	}
    }

    if ($new_disks) {
	my $storage_cfg = PVE::Storage::config();
	create_disks($storage_cfg, $vmid, $conf, $conf);
    }

    # This should be the last thing we do here
    if ($running && scalar(@nohotplug)) {
	die "unable to modify " . join(',', @nohotplug) . " while container is running\n";
    }
}

sub has_dev_console {
    my ($conf) = @_;

    return !(defined($conf->{console}) && !$conf->{console});
}
	
sub get_tty_count {
    my ($conf) = @_;

    return $conf->{tty} // $confdesc->{tty}->{default};
}

sub get_cmode {
    my ($conf) = @_;

    return $conf->{cmode} // $confdesc->{cmode}->{default};
}

sub get_console_command {
    my ($vmid, $conf) = @_;

    my $cmode = get_cmode($conf);

    if ($cmode eq 'console') {
	return ['lxc-console', '-n',  $vmid, '-t', 0];
    } elsif ($cmode eq 'tty') {
	return ['lxc-console', '-n',  $vmid];
    } elsif ($cmode eq 'shell') {
	return ['lxc-attach', '--clear-env', '-n', $vmid];
    } else {
	die "internal error";
    }
}

sub get_primary_ips {
    my ($conf) = @_;

    # return data from net0

    return undef if !defined($conf->{net0});
    my $net = parse_lxc_network($conf->{net0});

    my $ipv4 = $net->{ip};
    if ($ipv4) {
	if ($ipv4 =~ /^(dhcp|manual)$/) {
	    $ipv4 = undef
	} else {
	    $ipv4 =~ s!/\d+$!!;
	}
    }
    my $ipv6 = $net->{ip6};
    if ($ipv6) {
	if ($ipv6 =~ /^(auto|dhcp|manual)$/) {
	    $ipv6 = undef;
	} else {
	    $ipv6 =~ s!/\d+$!!;
	}
    }

    return ($ipv4, $ipv6);
}

sub delete_mountpoint_volume {
    my ($storage_cfg, $vmid, $volume) = @_;

    return if classify_mountpoint($volume) ne 'volume';

    my ($vtype, $name, $owner) = PVE::Storage::parse_volname($storage_cfg, $volume);
    PVE::Storage::vdisk_free($storage_cfg, $volume) if $vmid == $owner;
}

sub destroy_lxc_container {
    my ($storage_cfg, $vmid, $conf) = @_;

    foreach_mountpoint($conf, sub {
	my ($ms, $mountpoint) = @_;
	delete_mountpoint_volume($storage_cfg, $vmid, $mountpoint->{volume});
    });

    rmdir "/var/lib/lxc/$vmid/rootfs";
    unlink "/var/lib/lxc/$vmid/config";
    rmdir "/var/lib/lxc/$vmid";
    destroy_config($vmid);

    #my $cmd = ['lxc-destroy', '-n', $vmid ];
    #PVE::Tools::run_command($cmd);
}

sub vm_stop_cleanup {
    my ($storage_cfg, $vmid, $conf, $keepActive) = @_;
    
    eval {
	if (!$keepActive) {

            my $vollist = get_vm_volumes($conf);
	    PVE::Storage::deactivate_volumes($storage_cfg, $vollist);
	}
    };
    warn $@ if $@; # avoid errors - just warn
}

my $safe_num_ne = sub {
    my ($a, $b) = @_;

    return 0 if !defined($a) && !defined($b);
    return 1 if !defined($a);
    return 1 if !defined($b);

    return $a != $b;
};

my $safe_string_ne = sub {
    my ($a, $b) = @_;

    return 0 if !defined($a) && !defined($b);
    return 1 if !defined($a);
    return 1 if !defined($b);

    return $a ne $b;
};

sub update_net {
    my ($vmid, $conf, $opt, $newnet, $netid, $rootdir) = @_;

    if ($newnet->{type} ne 'veth') {
	# for when there are physical interfaces
	die "cannot update interface of type $newnet->{type}";
    }

    my $veth = "veth${vmid}i${netid}";
    my $eth = $newnet->{name};

    if (my $oldnetcfg = $conf->{$opt}) {
	my $oldnet = parse_lxc_network($oldnetcfg);

	if (&$safe_string_ne($oldnet->{hwaddr}, $newnet->{hwaddr}) ||
	    &$safe_string_ne($oldnet->{name}, $newnet->{name})) {

	    PVE::Network::veth_delete($veth);
	    delete $conf->{$opt};
	    write_config($vmid, $conf);

	    hotplug_net($vmid, $conf, $opt, $newnet, $netid);

	} elsif (&$safe_string_ne($oldnet->{bridge}, $newnet->{bridge}) ||
		 &$safe_num_ne($oldnet->{tag}, $newnet->{tag}) ||
		 &$safe_num_ne($oldnet->{firewall}, $newnet->{firewall})) {

		if ($oldnet->{bridge}) {
		    PVE::Network::tap_unplug($veth);
		    foreach (qw(bridge tag firewall)) {
			delete $oldnet->{$_};
		    }
		    $conf->{$opt} = print_lxc_network($oldnet);
		    write_config($vmid, $conf);
		}

		PVE::Network::tap_plug($veth, $newnet->{bridge}, $newnet->{tag}, $newnet->{firewall}, $newnet->{trunks});
		foreach (qw(bridge tag firewall)) {
		    $oldnet->{$_} = $newnet->{$_} if $newnet->{$_};
		}
		$conf->{$opt} = print_lxc_network($oldnet);
		write_config($vmid, $conf);
	}
    } else {
	hotplug_net($vmid, $conf, $opt, $newnet, $netid);
    }

    update_ipconfig($vmid, $conf, $opt, $eth, $newnet, $rootdir);
}

sub hotplug_net {
    my ($vmid, $conf, $opt, $newnet, $netid) = @_;

    my $veth = "veth${vmid}i${netid}";
    my $vethpeer = $veth . "p";
    my $eth = $newnet->{name};

    PVE::Network::veth_create($veth, $vethpeer, $newnet->{bridge}, $newnet->{hwaddr});
    PVE::Network::tap_plug($veth, $newnet->{bridge}, $newnet->{tag}, $newnet->{firewall}, $newnet->{trunks});

    # attach peer in container
    my $cmd = ['lxc-device', '-n', $vmid, 'add', $vethpeer, "$eth" ];
    PVE::Tools::run_command($cmd);

    # link up peer in container
    $cmd = ['lxc-attach', '-n', $vmid, '-s', 'NETWORK', '--', '/sbin/ip', 'link', 'set', $eth ,'up'  ];
    PVE::Tools::run_command($cmd);

    my $done = { type => 'veth' };
    foreach (qw(bridge tag firewall hwaddr name)) {
	$done->{$_} = $newnet->{$_} if $newnet->{$_};
    }
    $conf->{$opt} = print_lxc_network($done);

    write_config($vmid, $conf);
}

sub update_ipconfig {
    my ($vmid, $conf, $opt, $eth, $newnet, $rootdir) = @_;

    my $lxc_setup = PVE::LXC::Setup->new($conf, $rootdir);

    my $optdata = parse_lxc_network($conf->{$opt});
    my $deleted = [];
    my $added = [];
    my $nscmd = sub {
	my $cmdargs = shift;
	PVE::Tools::run_command(['lxc-attach', '-n', $vmid, '-s', 'NETWORK', '--', @_], %$cmdargs);
    };
    my $ipcmd = sub { &$nscmd({}, '/sbin/ip', @_) };

    my $change_ip_config = sub {
	my ($ipversion) = @_;

	my $family_opt = "-$ipversion";
	my $suffix = $ipversion == 4 ? '' : $ipversion;
	my $gw= "gw$suffix";
	my $ip= "ip$suffix";

	my $newip = $newnet->{$ip};
	my $newgw = $newnet->{$gw};
	my $oldip = $optdata->{$ip};

	my $change_ip = &$safe_string_ne($oldip, $newip);
	my $change_gw = &$safe_string_ne($optdata->{$gw}, $newgw);

	return if !$change_ip && !$change_gw;

	# step 1: add new IP, if this fails we cancel
	my $is_real_ip = ($newip && $newip !~ /^(?:auto|dhcp|manual)$/);
	if ($change_ip && $is_real_ip) {
	    eval { &$ipcmd($family_opt, 'addr', 'add', $newip, 'dev', $eth); };
	    if (my $err = $@) {
		warn $err;
		return;
	    }
	}

	# step 2: replace gateway
	#   If this fails we delete the added IP and cancel.
	#   If it succeeds we save the config and delete the old IP, ignoring
	#   errors. The config is then saved.
	# Note: 'ip route replace' can add
	if ($change_gw) {
	    if ($newgw) {
		eval {
		    if ($is_real_ip && !PVE::Network::is_ip_in_cidr($newgw, $newip, $ipversion)) {
			&$ipcmd($family_opt, 'route', 'add', $newgw, 'dev', $eth);
		    }
		    &$ipcmd($family_opt, 'route', 'replace', 'default', 'via', $newgw);
		};
		if (my $err = $@) {
		    warn $err;
		    # the route was not replaced, the old IP is still available
		    # rollback (delete new IP) and cancel
		    if ($change_ip) {
			eval { &$ipcmd($family_opt, 'addr', 'del', $newip, 'dev', $eth); };
			warn $@ if $@; # no need to die here
		    }
		    return;
		}
	    } else {
		eval { &$ipcmd($family_opt, 'route', 'del', 'default'); };
		# if the route was not deleted, the guest might have deleted it manually
		# warn and continue
		warn $@ if $@;
	    }
	}

	# from this point on we save the configuration
	# step 3: delete old IP ignoring errors
	if ($change_ip && $oldip && $oldip !~ /^(?:auto|dhcp)$/) {
	    # We need to enable promote_secondaries, otherwise our newly added
	    # address will be removed along with the old one.
	    my $promote = 0;
	    eval {
		if ($ipversion == 4) {
		    &$nscmd({ outfunc => sub { $promote = int(shift) } },
			    'cat', "/proc/sys/net/ipv4/conf/$eth/promote_secondaries");
		    &$nscmd({}, 'sysctl', "net.ipv4.conf.$eth.promote_secondaries=1");
		}
		&$ipcmd($family_opt, 'addr', 'del', $oldip, 'dev', $eth);
	    };
	    warn $@ if $@; # no need to die here

	    if ($ipversion == 4) {
		&$nscmd({}, 'sysctl', "net.ipv4.conf.$eth.promote_secondaries=$promote");
	    }
	}

	foreach my $property ($ip, $gw) {
	    if ($newnet->{$property}) {
		$optdata->{$property} = $newnet->{$property};
	    } else {
		delete $optdata->{$property};
	    }
	}
	$conf->{$opt} = print_lxc_network($optdata);
	write_config($vmid, $conf);
	$lxc_setup->setup_network($conf);
    };

    &$change_ip_config(4);
    &$change_ip_config(6);

}

# Internal snapshots

# NOTE: Snapshot create/delete involves several non-atomic
# actions, and can take a long time.
# So we try to avoid locking the file and use the 'lock' variable
# inside the config file instead.

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

    foreach my $k (keys %$source) {
	next if $k eq 'snapshots';
	next if $k eq 'snapstate';
	next if $k eq 'snaptime';
	next if $k eq 'vmstate';
	next if $k eq 'lock';
	next if $k eq 'digest';
	next if $k eq 'description';
	next if $k =~ m/^unused\d+$/;

	$dest->{$k} = $source->{$k};
    }
};

my $snapshot_apply_config = sub {
    my ($conf, $snap) = @_;

    # copy snapshot list
    my $newconf = {
	snapshots => $conf->{snapshots},
    };

    # keep description and list of unused disks
    foreach my $k (keys %$conf) {
	next if !($k =~ m/^unused\d+$/ || $k eq 'description');
	$newconf->{$k} = $conf->{$k};
    }

    &$snapshot_copy_config($snap, $newconf);

    return $newconf;
};

sub snapshot_save_vmstate {
    die "implement me - snapshot_save_vmstate\n";
}

sub snapshot_prepare {
    my ($vmid, $snapname, $save_vmstate, $comment) = @_;

    my $snap;

    my $updatefn =  sub {

	my $conf = load_config($vmid);

	die "you can't take a snapshot if it's a template\n"
	    if is_template($conf);

	check_lock($conf);

	$conf->{lock} = 'snapshot';

	die "snapshot name '$snapname' already used\n"
	    if defined($conf->{snapshots}->{$snapname});

	my $storecfg = PVE::Storage::config();
	die "snapshot feature is not available\n"
	    if !has_feature('snapshot', $conf, $storecfg, undef, undef, $snapname eq 'vzdump');

	$snap = $conf->{snapshots}->{$snapname} = {};

	if ($save_vmstate && check_running($vmid)) {
	    snapshot_save_vmstate($vmid, $conf, $snapname, $storecfg);
	}

	&$snapshot_copy_config($conf, $snap);

	$snap->{snapstate} = "prepare";
	$snap->{snaptime} = time();
	$snap->{description} = $comment if $comment;

	write_config($vmid, $conf);
    };

    lock_config($vmid, $updatefn);

    return $snap;
}

sub snapshot_commit {
    my ($vmid, $snapname) = @_;

    my $updatefn = sub {

	my $conf = load_config($vmid);

	die "missing snapshot lock\n"
	    if !($conf->{lock} && $conf->{lock} eq 'snapshot');

	my $snap = $conf->{snapshots}->{$snapname};
	die "snapshot '$snapname' does not exist\n" if !defined($snap);

	die "wrong snapshot state\n"
	    if !($snap->{snapstate} && $snap->{snapstate} eq "prepare");

	delete $snap->{snapstate};
	delete $conf->{lock};

	$conf->{parent} = $snapname;

	write_config($vmid, $conf);
    };

    lock_config($vmid, $updatefn);
}

sub has_feature {
    my ($feature, $conf, $storecfg, $snapname, $running, $backup_only) = @_;
    
    my $err;

    foreach_mountpoint($conf, sub {
	my ($ms, $mountpoint) = @_;

	return if $err; # skip further test
	return if $backup_only && $ms ne 'rootfs' && !$mountpoint->{backup};
	
	$err = 1 if !PVE::Storage::volume_has_feature($storecfg, $feature, $mountpoint->{volume}, $snapname, $running);
    });

    return $err ? 0 : 1;
}

my $enter_namespace = sub {
    my ($vmid, $pid, $which, $type) = @_;
    sysopen my $fd, "/proc/$pid/ns/$which", O_RDONLY
	or die "failed to open $which namespace of container $vmid: $!\n";
    PVE::Tools::setns(fileno($fd), $type)
	or die "failed to enter $which namespace of container $vmid: $!\n";
    close $fd;
};

my $do_syncfs = sub {
    my ($vmid, $pid, $socket) = @_;

    &$enter_namespace($vmid, $pid, 'mnt', PVE::Tools::CLONE_NEWNS);

    # Tell the parent process to start reading our /proc/mounts
    print {$socket} "go\n";
    $socket->flush();

    # Receive /proc/self/mounts
    my $mountdata = do { local $/ = undef; <$socket> };
    close $socket;

    # Now sync all mountpoints...
    my $mounts = PVE::ProcFSTools::parse_mounts($mountdata);
    foreach my $mp (@$mounts) {
	my ($what, $dir, $fs) = @$mp;
	next if $fs eq 'fuse.lxcfs';
	eval { PVE::Tools::sync_mountpoint($dir); };
	warn $@ if $@;
    }
};

sub sync_container_namespace {
    my ($vmid) = @_;
    my $pid = find_lxc_pid($vmid);

    # SOCK_DGRAM is nicer for barriers but cannot be slurped
    socketpair my $pfd, my $cfd, AF_UNIX, SOCK_STREAM, PF_UNSPEC
	or die "failed to create socketpair: $!\n";

    my $child = fork();
    die "fork failed: $!\n" if !defined($child);

    if (!$child) {
	eval {
	    close $pfd;
	    &$do_syncfs($vmid, $pid, $cfd);
	};
	if (my $err = $@) {
	    warn $err;
	    POSIX::_exit(1);
	}
	POSIX::_exit(0);
    }
    close $cfd;
    my $go = <$pfd>;
    die "failed to enter container namespace\n" if $go ne "go\n";

    open my $mounts, '<', "/proc/$child/mounts"
	or die "failed to open container's /proc/mounts: $!\n";
    my $mountdata = do { local $/ = undef; <$mounts> };
    close $mounts;
    print {$pfd} $mountdata;
    close $pfd;

    while (waitpid($child, 0) != $child) {}
    die "failed to sync container namespace\n" if $? != 0;
}

sub check_freeze_needed {
    my ($vmid, $config, $save_vmstate) = @_;

    my $ret = check_running($vmid);
    return ($ret, $ret);
}

sub snapshot_create {
    my ($vmid, $snapname, $save_vmstate, $comment) = @_;

    my $snap = snapshot_prepare($vmid, $snapname, $save_vmstate, $comment);

    $save_vmstate = 0 if !$snap->{vmstate};

    my $conf = load_config($vmid);

    my ($running, $freezefs) = check_freeze_needed($vmid, $conf, $snap->{vmstate});

    my $drivehash = {};

    eval {
	if ($freezefs) {
	    PVE::Tools::run_command(['/usr/bin/lxc-freeze', '-n', $vmid]);
	    sync_container_namespace($vmid);
	}

	my $storecfg = PVE::Storage::config();
	foreach_mountpoint($conf, sub {
	    my ($ms, $mountpoint) = @_;

	    return if $snapname eq 'vzdump' && $ms ne 'rootfs' && !$mountpoint->{backup};
	    PVE::Storage::volume_snapshot($storecfg, $mountpoint->{volume}, $snapname);
	    $drivehash->{$ms} = 1;
	});
    };
    my $err = $@;
    
    if ($running) {
	if ($freezefs) {
	    eval { PVE::Tools::run_command(['/usr/bin/lxc-unfreeze', '-n', $vmid]); };
	    warn $@ if $@;
	}
    }
    
    if ($err) {
	warn "snapshot create failed: starting cleanup\n";
	eval { snapshot_delete($vmid, $snapname, 1, $drivehash); };
	warn "$@" if $@;
	die "$err\n";
    }

    snapshot_commit($vmid, $snapname);
}

# Note: $drivehash is only set when called from snapshot_create.
sub snapshot_delete {
    my ($vmid, $snapname, $force, $drivehash) = @_;

    my $prepare = 1;

    my $snap;
    my $unused = [];

    my $unlink_parent = sub {
	my ($confref, $new_parent) = @_;

	if ($confref->{parent} && $confref->{parent} eq $snapname) {
	    if ($new_parent) {
		$confref->{parent} = $new_parent;
	    } else {
		delete $confref->{parent};
	    }
	}
    };

    my $updatefn =  sub {
	my ($remove_drive) = @_;

	my $conf = load_config($vmid);

	if (!$drivehash) {
	    check_lock($conf);
	    die "you can't delete a snapshot if vm is a template\n"
		if is_template($conf);
	}

	$snap = $conf->{snapshots}->{$snapname};

	die "snapshot '$snapname' does not exist\n" if !defined($snap);

	# remove parent refs
	if (!$prepare) {
	    &$unlink_parent($conf, $snap->{parent});
	    foreach my $sn (keys %{$conf->{snapshots}}) {
		next if $sn eq $snapname;
		&$unlink_parent($conf->{snapshots}->{$sn}, $snap->{parent});
	    }
	}

	if ($remove_drive) {
	    if ($remove_drive eq 'vmstate') {
		die "implement me - saving vmstate\n";
	    } else {
		my $value = $snap->{$remove_drive};
		my $mountpoint = $remove_drive eq 'rootfs' ? parse_ct_rootfs($value, 1) : parse_ct_mountpoint($value, 1);
		delete $snap->{$remove_drive};
		add_unused_volume($snap, $mountpoint->{volume})
		    if (!is_volume_in_use($snap, $mountpoint->{volume}));
	    }
	}

	if ($prepare) {
	    $snap->{snapstate} = 'delete';
	} else {
	    delete $conf->{snapshots}->{$snapname};
	    delete $conf->{lock} if $drivehash;
	    foreach my $volid (@$unused) {
		add_unused_volume($conf, $volid)
		    if (!is_volume_in_use($conf, $volid));
	    }
	}

	write_config($vmid, $conf);
    };

    lock_config($vmid, $updatefn);

    # now remove vmstate file
    # never set for LXC!
    my $storecfg = PVE::Storage::config();

    if ($snap->{vmstate}) {
	die "implement me - saving vmstate\n";
    };

    # now remove all volume snapshots
    foreach_mountpoint($snap, sub {
	my ($ms, $mountpoint) = @_;

	return if $snapname eq 'vzdump' && $ms ne 'rootfs' && !$mountpoint->{backup};
	if (!$drivehash || $drivehash->{$ms}) {
	    eval { PVE::Storage::volume_snapshot_delete($storecfg, $mountpoint->{volume}, $snapname); };
	    if (my $err = $@) {
		die $err if !$force;
		warn $err;
	    }
	}

	# save changes (remove mp from snapshot)
	lock_config($vmid, $updatefn, $ms) if !$force;
	push @$unused, $mountpoint->{volume};
    });

    # now cleanup config
    $prepare = 0;
    lock_config($vmid, $updatefn);
}

sub snapshot_rollback {
    my ($vmid, $snapname) = @_;

    my $prepare = 1;

    my $storecfg = PVE::Storage::config();

    my $conf = load_config($vmid);

    my $get_snapshot_config = sub {

	die "you can't rollback if vm is a template\n" if is_template($conf);

	my $res = $conf->{snapshots}->{$snapname};

	die "snapshot '$snapname' does not exist\n" if !defined($res);

	return $res;
    };

    my $snap = &$get_snapshot_config();

    foreach_mountpoint($snap, sub {
	my ($ms, $mountpoint) = @_;

	PVE::Storage::volume_rollback_is_possible($storecfg, $mountpoint->{volume}, $snapname);
    });

    my $updatefn = sub {

	$conf = load_config($vmid);

	$snap = &$get_snapshot_config();

	die "unable to rollback to incomplete snapshot (snapstate = $snap->{snapstate})\n"
	    if $snap->{snapstate};

	if ($prepare) {
	    check_lock($conf);
	    PVE::Tools::run_command(['/usr/bin/lxc-stop', '-n', $vmid, '--kill'])
		if check_running($vmid);
	}

	die "unable to rollback vm $vmid: vm is running\n"
	    if check_running($vmid);

	if ($prepare) {
	    $conf->{lock} = 'rollback';
	} else {
	    die "got wrong lock\n" if !($conf->{lock} && $conf->{lock} eq 'rollback');
	    delete $conf->{lock};
	}

	my $forcemachine;

	if (!$prepare) {
	    # copy snapshot config to current config
	    $conf = &$snapshot_apply_config($conf, $snap);
	    $conf->{parent} = $snapname;
	}

	write_config($vmid, $conf);

	if (!$prepare && $snap->{vmstate}) {
	    die "implement me - save vmstate\n";
	}
    };

    lock_config($vmid, $updatefn);

    foreach_mountpoint($snap, sub {
	my ($ms, $mountpoint) = @_;

	PVE::Storage::volume_snapshot_rollback($storecfg, $mountpoint->{volume}, $snapname);
    });

    $prepare = 0;
    lock_config($vmid, $updatefn);
}

sub template_create {
    my ($vmid, $conf) = @_;

    my $storecfg = PVE::Storage::config();

    my $rootinfo = parse_ct_rootfs($conf->{rootfs});
    my $volid = $rootinfo->{volume};

    die "Template feature is not available for '$volid'\n"
	if !PVE::Storage::volume_has_feature($storecfg, 'template', $volid);

    PVE::Storage::activate_volumes($storecfg, [$volid]);

    my $template_volid = PVE::Storage::vdisk_create_base($storecfg, $volid);
    $rootinfo->{volume} = $template_volid;
    $conf->{rootfs} = print_ct_mountpoint($rootinfo, 1);

    write_config($vmid, $conf);
}

sub is_template {
    my ($conf) = @_;

    return 1 if defined $conf->{template} && $conf->{template} == 1;
}

sub mountpoint_names {
    my ($reverse) = @_;

    my @names = ('rootfs');

    for (my $i = 0; $i < $MAX_MOUNT_POINTS; $i++) {
	push @names, "mp$i";
    }

    return $reverse ? reverse @names : @names;
}


sub foreach_mountpoint_full {
    my ($conf, $reverse, $func) = @_;

    foreach my $key (mountpoint_names($reverse)) {
	my $value = $conf->{$key};
	next if !defined($value);
	my $mountpoint = $key eq 'rootfs' ? parse_ct_rootfs($value, 1) : parse_ct_mountpoint($value, 1);
	next if !defined($mountpoint);

	&$func($key, $mountpoint);
    }
}

sub foreach_mountpoint {
    my ($conf, $func) = @_;

    foreach_mountpoint_full($conf, 0, $func);
}

sub foreach_mountpoint_reverse {
    my ($conf, $func) = @_;

    foreach_mountpoint_full($conf, 1, $func);
}

sub check_ct_modify_config_perm {
    my ($rpcenv, $authuser, $vmid, $pool, $newconf, $delete) = @_;

    return 1 if $authuser eq 'root@pam';

    my $check = sub {
	my ($opt, $delete) = @_;
	if ($opt eq 'cpus' || $opt eq 'cpuunits' || $opt eq 'cpulimit') {
	    $rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.CPU']);
	} elsif ($opt eq 'rootfs' || $opt =~ /^mp\d+$/) {
	    $rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.Disk']);
	    return if $delete;
	    my $data = $opt eq 'rootfs' ? parse_ct_rootfs($newconf->{$opt})
					: parse_ct_mountpoint($newconf->{$opt});
	    raise_perm_exc("mountpoint type $data->{type}") if $data->{type} ne 'volume';
	} elsif ($opt eq 'memory' || $opt eq 'swap') {
	    $rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.Memory']);
	} elsif ($opt =~ m/^net\d+$/ || $opt eq 'nameserver' ||
		 $opt eq 'searchdomain' || $opt eq 'hostname') {
	    $rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.Network']);
	} else {
	    $rpcenv->check_vm_perm($authuser, $vmid, $pool, ['VM.Config.Options']);
	}
    };

    foreach my $opt (keys %$newconf) {
	&$check($opt, 0);
    }
    foreach my $opt (@$delete) {
	&$check($opt, 1);
    }

    return 1;
}

sub umount_all {
    my ($vmid, $storage_cfg, $conf, $noerr) = @_;

    my $rootdir = "/var/lib/lxc/$vmid/rootfs";
    my $volid_list = get_vm_volumes($conf);

    foreach_mountpoint_reverse($conf, sub {
	my ($ms, $mountpoint) = @_;

	my $volid = $mountpoint->{volume};
	my $mount = $mountpoint->{mp};

	return if !$volid || !$mount;

	my $mount_path = "$rootdir/$mount";
	$mount_path =~ s!/+!/!g;

	return if !PVE::ProcFSTools::is_mounted($mount_path);

	eval {
	    PVE::Tools::run_command(['umount', '-d', $mount_path]);
	};
	if (my $err = $@) {
	    if ($noerr) {
		warn $err;
	    } else {
		die $err;
	    }
	}
    });
}

sub mount_all {
    my ($vmid, $storage_cfg, $conf) = @_;

    my $rootdir = "/var/lib/lxc/$vmid/rootfs";
    File::Path::make_path($rootdir);

    my $volid_list = get_vm_volumes($conf);
    PVE::Storage::activate_volumes($storage_cfg, $volid_list);

    eval {
	foreach_mountpoint($conf, sub {
	    my ($ms, $mountpoint) = @_;

	    mountpoint_mount($mountpoint, $rootdir, $storage_cfg);
        });
    };
    if (my $err = $@) {
	warn "mounting container failed\n";
	umount_all($vmid, $storage_cfg, $conf, 1);
	die $err;
    }

    return $rootdir;
}


sub mountpoint_mount_path {
    my ($mountpoint, $storage_cfg, $snapname) = @_;

    return mountpoint_mount($mountpoint, undef, $storage_cfg, $snapname);
}

my $check_mount_path = sub {
    my ($path) = @_;
    $path = File::Spec->canonpath($path);
    my $real = Cwd::realpath($path);
    if ($real ne $path) {
	die "mount path modified by symlink: $path != $real";
    }
};

sub query_loopdev {
    my ($path) = @_;
    my $found;
    my $parser = sub {
	my $line = shift;
	if ($line =~ m@^(/dev/loop\d+):@) {
	    $found = $1;
	}
    };
    my $cmd = ['losetup', '--associated', $path];
    PVE::Tools::run_command($cmd, outfunc => $parser);
    return $found;
}

# Run a function with a file attached to a loop device.
# The loop device is always detached afterwards (or set to autoclear).
# Returns the loop device.
sub run_with_loopdev {
    my ($func, $file) = @_;
    my $device = query_loopdev($file);
    # Try to reuse an existing device
    if ($device) {
	# We assume that whoever setup the loop device is responsible for
	# detaching it.
	&$func($device);
	return $device;
    }

    my $parser = sub {
	my $line = shift;
	if ($line =~ m@^(/dev/loop\d+)$@) {
	    $device = $1;
	}
    };
    PVE::Tools::run_command(['losetup', '--show', '-f', $file], outfunc => $parser);
    die "failed to setup loop device for $file\n" if !$device;
    eval { &$func($device); };
    my $err = $@;
    PVE::Tools::run_command(['losetup', '-d', $device]);
    die $err if $err;
    return $device;
}

sub bindmount {
    my ($dir, $dest, $ro, @extra_opts) = @_;
    PVE::Tools::run_command(['mount', '-o', 'bind', @extra_opts, $dir, $dest]);
    if ($ro) {
	eval { PVE::Tools::run_command(['mount', '-o', 'bind,remount,ro', $dest]); };
	if (my $err = $@) {
	    warn "bindmount error\n";
	    # don't leave writable bind-mounts behind...
	    PVE::Tools::run_command(['umount', $dest]);
	    die $err;
	}
    }
}

# use $rootdir = undef to just return the corresponding mount path
sub mountpoint_mount {
    my ($mountpoint, $rootdir, $storage_cfg, $snapname) = @_;

    my $volid = $mountpoint->{volume};
    my $mount = $mountpoint->{mp};
    my $type = $mountpoint->{type};
    my $quota = !$snapname && !$mountpoint->{ro} && $mountpoint->{quota};
    my $mounted_dev;
    
    return if !$volid || !$mount;

    my $mount_path;
    
    if (defined($rootdir)) {
	$rootdir =~ s!/+$!!;
	$mount_path = "$rootdir/$mount";
	$mount_path =~ s!/+!/!g;
	&$check_mount_path($mount_path);
	File::Path::mkpath($mount_path);
    }
    
    my ($storage, $volname) = PVE::Storage::parse_volume_id($volid, 1);

    die "unknown snapshot path for '$volid'" if !$storage && defined($snapname);

    my $optstring = '';
    if (defined($mountpoint->{acl})) {
	$optstring .= ($mountpoint->{acl} ? 'acl' : 'noacl');
    }
    my $readonly = $mountpoint->{ro};

    my @extra_opts = ('-o', $optstring);

    if ($storage) {

	my $scfg = PVE::Storage::storage_config($storage_cfg, $storage);
	my $path = PVE::Storage::path($storage_cfg, $volid, $snapname);

	my ($vtype, undef, undef, undef, undef, $isBase, $format) =
	    PVE::Storage::parse_volname($storage_cfg, $volid);

	$format = 'iso' if $vtype eq 'iso'; # allow to handle iso files

	if ($format eq 'subvol') {
	    if ($mount_path) {
		if ($snapname) {
		    if ($scfg->{type} eq 'zfspool') {
			my $path_arg = $path;
			$path_arg =~ s!^/+!!;
			PVE::Tools::run_command(['mount', '-o', 'ro', @extra_opts, '-t', 'zfs', $path_arg, $mount_path]);
		    } else {
			die "cannot mount subvol snapshots for storage type '$scfg->{type}'\n";
		    }
		} else {
		    bindmount($path, $mount_path, $readonly, @extra_opts);
		    warn "cannot enable quota control for bind mounted subvolumes\n" if $quota;
		}
	    }
	    return wantarray ? ($path, 0, $mounted_dev) : $path;
	} elsif ($format eq 'raw' || $format eq 'iso') {
	    my $domount = sub {
		my ($path) = @_;
		if ($mount_path) {
		    if ($format eq 'iso') {
			PVE::Tools::run_command(['mount', '-o', 'ro', @extra_opts, $path, $mount_path]);
		    } elsif ($isBase || defined($snapname)) {
			PVE::Tools::run_command(['mount', '-o', 'ro,noload', @extra_opts, $path, $mount_path]);
		    } else {
			if ($quota) {
			    push @extra_opts, '-o', 'usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv0';
			}
			push @extra_opts, '-o', 'ro' if $readonly;
			PVE::Tools::run_command(['mount', @extra_opts, $path, $mount_path]);
		    }
		}
	    };
	    my $use_loopdev = 0;
	    if ($scfg->{path}) {
		$mounted_dev = run_with_loopdev($domount, $path);
		$use_loopdev = 1;
	    } elsif ($scfg->{type} eq 'drbd' || $scfg->{type} eq 'lvm' ||
		     $scfg->{type} eq 'rbd' || $scfg->{type} eq 'lvmthin') {
		$mounted_dev = $path;
		&$domount($path);
	    } else {
		die "unsupported storage type '$scfg->{type}'\n";
	    }
	    return wantarray ? ($path, $use_loopdev, $mounted_dev) : $path;
	} else {
	    die "unsupported image format '$format'\n";
	}
    } elsif ($type eq 'device') {
			push @extra_opts, '-o', 'ro' if $readonly;
	PVE::Tools::run_command(['mount', @extra_opts, $volid, $mount_path]) if $mount_path;
	return wantarray ? ($volid, 0, $volid) : $volid;
    } elsif ($type eq 'bind') {
	die "directory '$volid' does not exist\n" if ! -d $volid;
	&$check_mount_path($volid);
	bindmount($volid, $mount_path, $readonly, @extra_opts) if $mount_path;
	warn "cannot enable quota control for bind mounts\n" if $quota;
	return wantarray ? ($volid, 0, undef) : $volid;
    }
    
    die "unsupported storage";
}

sub get_vm_volumes {
    my ($conf, $excludes) = @_;

    my $vollist = [];

    foreach_mountpoint($conf, sub {
	my ($ms, $mountpoint) = @_;

	return if $excludes && $ms eq $excludes;

	my $volid = $mountpoint->{volume};

        return if !$volid || $mountpoint->{type} ne 'volume';

        my ($sid, $volname) = PVE::Storage::parse_volume_id($volid, 1);
        return if !$sid;

        push @$vollist, $volid;
    });

    return $vollist;
}

sub mkfs {
    my ($dev, $rootuid, $rootgid) = @_;

    PVE::Tools::run_command(['mkfs.ext4', '-O', 'mmp',
			     '-E', "root_owner=$rootuid:$rootgid",
			     $dev]);
}

sub format_disk {
    my ($storage_cfg, $volid, $rootuid, $rootgid) = @_;

    if ($volid =~ m!^/dev/.+!) {
	mkfs($volid);
	return;
    }

    my ($storage, $volname) = PVE::Storage::parse_volume_id($volid, 1);

    die "cannot format volume '$volid' with no storage\n" if !$storage;

    PVE::Storage::activate_volumes($storage_cfg, [$volid]);

    my $path = PVE::Storage::path($storage_cfg, $volid);

    my ($vtype, undef, undef, undef, undef, $isBase, $format) =
	PVE::Storage::parse_volname($storage_cfg, $volid);

    die "cannot format volume '$volid' (format == $format)\n"
	if $format ne 'raw';

    mkfs($path, $rootuid, $rootgid);
}

sub destroy_disks {
    my ($storecfg, $vollist) = @_;

    foreach my $volid (@$vollist) {
	eval { PVE::Storage::vdisk_free($storecfg, $volid); };
	warn $@ if $@;
    }
}

sub create_disks {
    my ($storecfg, $vmid, $settings, $conf) = @_;

    my $vollist = [];

    eval {
	my (undef, $rootuid, $rootgid) = PVE::LXC::parse_id_maps($conf);
	my $chown_vollist = [];

	foreach_mountpoint($settings, sub {
	    my ($ms, $mountpoint) = @_;

	    my $volid = $mountpoint->{volume};
	    my $mp = $mountpoint->{mp};

	    my ($storage, $volname) = PVE::Storage::parse_volume_id($volid, 1);

	    if ($storage && ($volid =~ m/^([^:\s]+):(\d+(\.\d+)?)$/)) {
		my ($storeid, $size_gb) = ($1, $2);

		my $size_kb = int(${size_gb}*1024) * 1024;

		my $scfg = PVE::Storage::storage_config($storecfg, $storage);
		# fixme: use better naming ct-$vmid-disk-X.raw?

		if ($scfg->{type} eq 'dir' || $scfg->{type} eq 'nfs') {
		    if ($size_kb > 0) {
			$volid = PVE::Storage::vdisk_alloc($storecfg, $storage, $vmid, 'raw',
							   undef, $size_kb);
			format_disk($storecfg, $volid, $rootuid, $rootgid);
		    } else {
			$volid = PVE::Storage::vdisk_alloc($storecfg, $storage, $vmid, 'subvol',
							   undef, 0);
			push @$chown_vollist, $volid;
		    }
		} elsif ($scfg->{type} eq 'zfspool') {

		    $volid = PVE::Storage::vdisk_alloc($storecfg, $storage, $vmid, 'subvol',
					               undef, $size_kb);
		    push @$chown_vollist, $volid;
		} elsif ($scfg->{type} eq 'drbd' || $scfg->{type} eq 'lvm' || $scfg->{type} eq 'lvmthin') {

		    $volid = PVE::Storage::vdisk_alloc($storecfg, $storage, $vmid, 'raw', undef, $size_kb);
		    format_disk($storecfg, $volid, $rootuid, $rootgid);

		} elsif ($scfg->{type} eq 'rbd') {

		    die "krbd option must be enabled on storage type '$scfg->{type}'\n" if !$scfg->{krbd};
		    $volid = PVE::Storage::vdisk_alloc($storecfg, $storage, $vmid, 'raw', undef, $size_kb);
		    format_disk($storecfg, $volid, $rootuid, $rootgid);
		} else {
		    die "unable to create containers on storage type '$scfg->{type}'\n";
		}
		push @$vollist, $volid;
		$mountpoint->{volume} = $volid;
		$mountpoint->{size} = $size_kb * 1024;
		$conf->{$ms} = print_ct_mountpoint($mountpoint, $ms eq 'rootfs');
	    } else {
                # use specified/existing volid/dir/device
                $conf->{$ms} = print_ct_mountpoint($mountpoint, $ms eq 'rootfs');
	    }
	});

	PVE::Storage::activate_volumes($storecfg, $chown_vollist, undef);
	foreach my $volid (@$chown_vollist) {
	    my $path = PVE::Storage::path($storecfg, $volid, undef);
	    chown($rootuid, $rootgid, $path);
	}
	PVE::Storage::deactivate_volumes($storecfg, $chown_vollist, undef);
    };
    # free allocated images on error
    if (my $err = $@) {
	destroy_disks($storecfg, $vollist);
        die $err;
    }
    return $vollist;
}

# bash completion helper

sub complete_os_templates {
    my ($cmdname, $pname, $cvalue) = @_;

    my $cfg = PVE::Storage::config();

    my $storeid;

    if ($cvalue =~ m/^([^:]+):/) {
	$storeid = $1;
    }

    my $vtype = $cmdname eq 'restore' ? 'backup' : 'vztmpl';
    my $data = PVE::Storage::template_list($cfg, $storeid, $vtype);

    my $res = [];
    foreach my $id (keys %$data) {
	foreach my $item (@{$data->{$id}}) {
	    push @$res, $item->{volid} if defined($item->{volid});
	}
    }

    return $res;
}

my $complete_ctid_full = sub {
    my ($running) = @_;

    my $idlist = vmstatus();

    my $active_hash = list_active_containers();

    my $res = [];

    foreach my $id (keys %$idlist) {
	my $d = $idlist->{$id};
	if (defined($running)) {
	    next if $d->{template};
	    next if $running && !$active_hash->{$id};
	    next if !$running && $active_hash->{$id};
	}
	push @$res, $id;

    }
    return $res;
};

sub complete_ctid {
    return &$complete_ctid_full();
}

sub complete_ctid_stopped {
    return &$complete_ctid_full(0);
}

sub complete_ctid_running {
    return &$complete_ctid_full(1);
}

sub parse_id_maps {
    my ($conf) = @_;

    my $id_map = [];
    my $rootuid = 0;
    my $rootgid = 0;

    my $lxc = $conf->{lxc};
    foreach my $entry (@$lxc) {
	my ($key, $value) = @$entry;
	next if $key ne 'lxc.id_map';
	if ($value =~ /^([ug])\s+(\d+)\s+(\d+)\s+(\d+)\s*$/) {
	    my ($type, $ct, $host, $length) = ($1, $2, $3, $4);
	    push @$id_map, [$type, $ct, $host, $length];
	    if ($ct == 0) {
		$rootuid = $host if $type eq 'u';
		$rootgid = $host if $type eq 'g';
	    }
	} else {
	    die "failed to parse id_map: $value\n";
	}
    }

    if (!@$id_map && $conf->{unprivileged}) {
	# Should we read them from /etc/subuid?
	$id_map = [ ['u', '0', '100000', '65536'],
	            ['g', '0', '100000', '65536'] ];
	$rootuid = $rootgid = 100000;
    }

    return ($id_map, $rootuid, $rootgid);
}

sub userns_command {
    my ($id_map) = @_;
    if (@$id_map) {
	return ['lxc-usernsexec', (map { ('-m', join(':', @$_)) } @$id_map), '--'];
    }
    return [];
}

sub set_lock {
    my ($vmid, $lock) = @_;
    my $conf;
    lock_config($vmid, sub {
	$conf = load_config($vmid);
	check_lock($conf);
	$conf->{lock} = $lock;
	write_config($vmid, $conf);
    });
    return $conf;
}

sub remove_lock {
    my ($vmid, $lock) = @_;
    lock_config($vmid, sub {
	my $conf = load_config($vmid);
	if (!$conf->{lock}) {
	    die "no lock found trying to remove lock '$lock'\n";
	} elsif (defined($lock) && $conf->{lock} ne $lock) {
	    die "found lock '$conf->{lock}' trying to remove lock '$lock'\n";
	}
	delete $conf->{lock};
	write_config($vmid, $conf);
    });
}

1;