#!/usr/bin/perl

$ENV{DEBIAN_FRONTEND} = 'noninteractive';
$ENV{LC_ALL} = 'C';

use strict;
use warnings;

use Getopt::Long;
use IPC::Open2;
use IPC::Open3;
use IO::File;
use IO::Select;
use Cwd 'abs_path';
use Gtk3 '-init';
use Gtk3::WebKit2;
use Encode;
use String::ShellQuote;
use Data::Dumper;
use File::Basename;
use File::Path;
use Time::HiRes;

use ProxmoxInstallerSetup;

my $setup = ProxmoxInstallerSetup::setup();

my $opt_testmode;

if (!$ENV{G_SLICE} ||  $ENV{G_SLICE} ne "always-malloc") {
    die "do not use slice allocator (run with 'G_SLICE=always-malloc ./proxinstall ...')\n";
}

if (!GetOptions('testmode=s' => \$opt_testmode)) {
    die "usage error\n";
    exit (-1);
}

my $zfstestpool = "test_rpool";
my $zfspoolname = $opt_testmode ? $zfstestpool : 'rpool';
my $zfsrootvolname = "$setup->{product}-1";

my $product_fullname = {
    pve => 'Proxmox VE',
    pmg => 'Proxmox MailGateway',
};

my $storage_cfg_zfs = <<__EOD__;
dir: local
	path /var/lib/vz
	content iso,vztmpl,backup

zfspool: local-zfs
	pool $zfspoolname/data
	sparse
	content images,rootdir
__EOD__

my $storage_cfg_btrfs = <<__EOD__;
dir: local
	path /var/lib/vz
	content iso,vztmpl,backup
	disabled

btrfs: local-btrfs
	path /var/lib/pve/local-btrfs
	content iso,vztmpl,backup,images,rootdir
__EOD__

my $storage_cfg_lvmthin = <<__EOD__;
dir: local
	path /var/lib/vz
	content iso,vztmpl,backup

lvmthin: local-lvm
	thinpool data
	vgname pve
	content rootdir,images
__EOD__

my $storage_cfg_local = <<__EOD__;
dir: local
	path /var/lib/vz
	content iso,vztmpl,backup,rootdir,images
__EOD__

sub file_read_firstline {
    my ($filename) = @_;

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

my $logfd = IO::File->new(">/tmp/install.log");

my $proxmox_libdir = $opt_testmode ?
    Cwd::cwd() . "/testdir/var/lib/pve-installer" : "/var/lib/pve-installer";
my $proxmox_cddir = $opt_testmode ? "../pve-cd-builder/tmp/data-gz/" : "/cdrom";
my $proxmox_pkgdir = "${proxmox_cddir}/proxmox/packages/";

my $boot_type = -d '/sys/firmware/efi' ? 'efi' : 'bios';

my $IPV4OCTET = "(?:25[0-5]|(?:2[0-4]|1[0-9]|[1-9])?[0-9])";
my $IPV4RE = "(?:(?:$IPV4OCTET\\.){3}$IPV4OCTET)";
my $IPV6H16 = "(?:[0-9a-fA-F]{1,4})";
my $IPV6LS32 = "(?:(?:$IPV4RE|$IPV6H16:$IPV6H16))";

my $IPV6RE = "(?:" .
    "(?:(?:" .                             "(?:$IPV6H16:){6})$IPV6LS32)|" .
    "(?:(?:" .                           "::(?:$IPV6H16:){5})$IPV6LS32)|" .
    "(?:(?:(?:" .              "$IPV6H16)?::(?:$IPV6H16:){4})$IPV6LS32)|" .
    "(?:(?:(?:(?:$IPV6H16:){0,1}$IPV6H16)?::(?:$IPV6H16:){3})$IPV6LS32)|" .
    "(?:(?:(?:(?:$IPV6H16:){0,2}$IPV6H16)?::(?:$IPV6H16:){2})$IPV6LS32)|" .
    "(?:(?:(?:(?:$IPV6H16:){0,3}$IPV6H16)?::(?:$IPV6H16:){1})$IPV6LS32)|" .
    "(?:(?:(?:(?:$IPV6H16:){0,4}$IPV6H16)?::" .           ")$IPV6LS32)|" .
    "(?:(?:(?:(?:$IPV6H16:){0,5}$IPV6H16)?::" .            ")$IPV6H16)|" .
    "(?:(?:(?:(?:$IPV6H16:){0,6}$IPV6H16)?::" .                    ")))";

my $IPRE = "(?:$IPV4RE|$IPV6RE)";


my $ipv4_mask_hash = {
    '128.0.0.0' => 1,
    '192.0.0.0' => 2,
    '224.0.0.0' => 3,
    '240.0.0.0' => 4,
    '248.0.0.0' => 5,
    '252.0.0.0' => 6,
    '254.0.0.0' => 7,
    '255.0.0.0' => 8,
    '255.128.0.0' => 9,
    '255.192.0.0' => 10,
    '255.224.0.0' => 11,
    '255.240.0.0' => 12,
    '255.248.0.0' => 13,
    '255.252.0.0' => 14,
    '255.254.0.0' => 15,
    '255.255.0.0' => 16,
    '255.255.128.0' => 17,
    '255.255.192.0' => 18,
    '255.255.224.0' => 19,
    '255.255.240.0' => 20,
    '255.255.248.0' => 21,
    '255.255.252.0' => 22,
    '255.255.254.0' => 23,
    '255.255.255.0' => 24,
    '255.255.255.128' => 25,
    '255.255.255.192' => 26,
    '255.255.255.224' => 27,
    '255.255.255.240' => 28,
    '255.255.255.248' => 29,
    '255.255.255.252' => 30,
    '255.255.255.254' => 31,
    '255.255.255.255' => 32
};

my $ipv4_reverse_mask = [
    '0.0.0.0',
    '128.0.0.0',
    '192.0.0.0',
    '224.0.0.0',
    '240.0.0.0',
    '248.0.0.0',
    '252.0.0.0',
    '254.0.0.0',
    '255.0.0.0',
    '255.128.0.0',
    '255.192.0.0',
    '255.224.0.0',
    '255.240.0.0',
    '255.248.0.0',
    '255.252.0.0',
    '255.254.0.0',
    '255.255.0.0',
    '255.255.128.0',
    '255.255.192.0',
    '255.255.224.0',
    '255.255.240.0',
    '255.255.248.0',
    '255.255.252.0',
    '255.255.254.0',
    '255.255.255.0',
    '255.255.255.128',
    '255.255.255.192',
    '255.255.255.224',
    '255.255.255.240',
    '255.255.255.248',
    '255.255.255.252',
    '255.255.255.254',
    '255.255.255.255',
];

my $step_number = 0; # Init number for global function list

my @steps = (
    {
	step => 'intro',
	html => 'license.htm',
	next_button => 'I a_gree',
	function => \&create_intro_view,
    },
    {
	step => 'intro',
	html => 'page1.htm',
	function => \&create_hdsel_view,
    },
    {
	step => 'country',
	html => 'country.htm',
	function => \&create_country_view,
    },
    {
	step => 'password',
	html => 'passwd.htm',
	function => \&create_password_view,
    },
    {
	step => 'ipconf',
	html => 'ipconf.htm',
	function => \&create_ipconf_view,
    },
    {
	step => 'ack',
	html => 'ack.htm',
	next_button => '_Install',
	function => \&create_ack_view,
    },
    {
	step => 'extract',
	next_button => '_Reboot',
	function => \&create_extract_view,
    },
);

# GUI global variables
my ($window, $cmdbox, $inbox, $htmlview);
my $prev_btn;
my ($next, $next_fctn, $target_hd);
my ($progress, $progress_status);

my ($ipversion, $ipaddress, $ipconf_entry_addr);
my ($netmask, $ipconf_entry_mask);
my ($gateway, $ipconf_entry_gw);
my ($dnsserver, $ipconf_entry_dns);
my $hostname = 'proxmox';
my $domain = 'domain.tld';
my $cmdline = file_read_firstline("/proc/cmdline");
my $ipconf;
my $country;
my $timezone = 'Europe/Vienna';
my $keymap = 'en-us';
my $password;
my $mailto = 'mail@example.invalid';
my $cmap;

my $config = {
    # TODO: add all the user-provided options for previous button
    country => $country,
    timezone => $timezone,
    keymap => $keymap,

    password => $password,
    mailto => $mailto,

    mngmt_nic => undef,
    hostname => $hostname,
    fqdn => undef,
    ipaddress => undef,
    netmask => undef,
    gateway => undef,
};

# parse command line args

my $config_options = {};

if ($cmdline =~ m/\s(ext3|ext4|xfs)(\s.*)?$/) {
    $config_options->{filesys} = $1;
} else {
    $config_options->{filesys} = 'ext4';
}

if ($cmdline =~ m/hdsize=(\d+(\.\d+)?)[\s\n]/i) {
    $config_options->{hdsize} = $1;
}

if ($cmdline =~ m/swapsize=(\d+(\.\d+)?)[\s\n]/i) {
    $config_options->{swapsize} = $1;
}

if ($cmdline =~ m/maxroot=(\d+(\.\d+)?)[\s\n]/i) {
    $config_options->{maxroot} = $1;
}

if ($cmdline =~ m/minfree=(\d+(\.\d+)?)[\s\n]/i) {
    $config_options->{minfree} = $1;
}

if ($setup->{product} eq 'pve') {
    if ($cmdline =~ m/maxvz=(\d+(\.\d+)?)[\s\n]/i) {
	$config_options->{maxvz} = $1;
    }
}

my $postfix_main_cf = <<_EOD;
# See /usr/share/postfix/main.cf.dist for a commented, more complete version

myhostname=__FQDN__

smtpd_banner = \$myhostname ESMTP \$mail_name (Debian/GNU)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination = \$myhostname, localhost.\$mydomain, localhost
relayhost =
mynetworks = 127.0.0.0/8
inet_interfaces = loopback-only
recipient_delimiter = +

compatibility_level = 2

_EOD

sub shellquote {
    my $str = shift;

    return String::ShellQuote::shell_quote($str);
}

sub cmd2string {
    my ($cmd) = @_;

    die "no arguments" if !$cmd;

    return $cmd if !ref($cmd);

    my @qa = ();
    foreach my $arg (@$cmd) { push @qa, shellquote($arg); }

    return join (' ', @qa);
}

sub syscmd {
    my ($cmd) = @_;

    return run_command($cmd, undef, undef, 1);
}

sub run_command {
    my ($cmd, $func, $input, $noout) = @_;

    my $cmdstr;
    if (!ref($cmd)) {
	$cmdstr = $cmd;
	if ($cmd =~ m/|/) {
	    # see 'man bash' for option pipefail
	    $cmd = [ '/bin/bash', '-c', "set -o pipefail && $cmd" ];
	} else {
	    $cmd = [ $cmd ];
	}
    } else {
	$cmdstr = cmd2string($cmd);
    }

    my $cmdtxt;
    if ($input && ($cmdstr !~ m/chpasswd/)) {
	$cmdtxt = "# $cmdstr <<EOD\n$input";
	chomp $cmdtxt;
	$cmdtxt .= "\nEOD\n";
    } else {
	$cmdtxt = "# $cmdstr\n";
    }

    if ($opt_testmode) {
	print $cmdtxt;
	STDOUT->flush();
    }

    print $logfd $cmdtxt;

    my $reader = IO::File->new();
    my $writer = IO::File->new();
    my $error  = IO::File->new();

    my $orig_pid = $$;

    my $pid;
    eval {
	$pid = open3($writer, $reader, $error, @$cmd) || die $!;
    };

    my $err = $@;

    # catch exec errors
    if ($orig_pid != $$) {
	POSIX::_exit (1);
	kill ('KILL', $$);
    }

    die $err if $err;

    print $writer $input if defined $input;
    close $writer;

    my $select = new IO::Select;
    $select->add($reader);
    $select->add($error);

    my ($ostream, $logout) = ('', '', '');

    while ($select->count) {
	my @handles = $select->can_read (0.2);

	Gtk3::main_iteration() while Gtk3::events_pending();

	next if !scalar (@handles); # timeout

	foreach my $h (@handles) {
	    my $buf = '';
	    my $count = sysread ($h, $buf, 4096);
	    if (!defined ($count)) {
		my $err = $!;
		kill (9, $pid);
		waitpid ($pid, 0);
		die "command '$cmd' failed: $err";
	    }
	    $select->remove($h) if !$count;
	    if ($h eq $reader) {
		$ostream .= $buf if !($noout || $func);
		$logout .= $buf;
		while ($logout =~ s/^([^\010\r\n]*)(\r|\n|(\010)+|\r\n)//s) {
		    my $line = $1;
		    &$func($line) if $func;
		}

	    } elsif ($h eq $error) {
		$ostream .= $buf if !($noout || $func);
	    }
	    print $buf;
	    STDOUT->flush();
	    print $logfd $buf;
	}
    }

    &$func($logout) if $func;

    my $rv = waitpid ($pid, 0);

    return $? if $noout; # behave like standard system();

    if ($? == -1) {
	die "command '$cmdstr' failed to execute\n";
    } elsif (my $sig = ($? & 127)) {
	die "command '$cmdstr' failed - got signal $sig\n";
    } elsif (my $exitcode = ($? >> 8)) {
	die "command '$cmdstr' failed with exit code $exitcode";
    }

    return $ostream;
}

sub detect_country {

    print "trying to detect country...\n";
    my $cpid = open2(\*TMP, undef, "traceroute -N 1 -q 1 -n 8.8.8.8");
    return undef if !$cpid;

    my $country;

    my $previous_alarm = alarm (10);
    eval  {
	local $SIG{ALRM} = sub { die "timed out!\n" };
	my $line;
	while (defined ($line = <TMP>)) {
	    print $logfd "DC TRACEROUTE: $line";
	    if ($line =~ m/\s*\d+\s+(\d+\.\d+\.\d+\.\d+)\s/) {
		my $geoip = `geoiplookup $1`;
		print $logfd "DC GEOIP: $geoip";
		if ($geoip =~ m/GeoIP Country Edition:\s*([A-Z]+),/) {
		    $country = lc ($1);
		    print $logfd "DC FOUND: $country\n";
		    last;
		}
	    }
	}
    };

    my $err = $@;

    alarm ($previous_alarm);

    close (TMP);

    if ($err) {
	print "unable to detect country - $err\n";
    } elsif ($country) {
	print "detected country: " . uc($country) . "\n";
    } else {
	print "unable to detect country\n";
    }

    return $country;
}

sub get_memtotal {

    open (MEMINFO, "/proc/meminfo");

    my $res = 512; # default to 512 if something goes wrong
    while (my $line = <MEMINFO>) {
	if ($line =~ m/^MemTotal:\s+(\d+)\s*kB/i) {
	    $res = int ($1 / 1024);
	}
    }

    close (MEMINFO);

    return $res;
}

my $total_memory = get_memtotal();

sub link_points_to {
    my ($src, $dest) = @_;

    my ($dev1,$ino1) = stat ($src);
    my ($dev2,$ino2) = stat ($dest);

    return 0 if !($dev1 && $dev2 && $ino1 && $ino2);

    return $ino1 == $ino2 && $dev1 == $dev2;
}

sub find_stable_path {
    my ($stabledir, $bdev) = @_;

    foreach my $path (<$stabledir/*>) {
	if (link_points_to($path, $bdev)) {
	    return wantarray ? ($path, basename($path)) : $path;
	}
    }
}

sub find_dev_by_uuid {
    my $bdev = shift;

    my ($full_path, $name) = find_stable_path("/dev/disk/by-uuid", $bdev);

    return $name;
}

sub hd_list {

    my $res = ();

    if ($opt_testmode) {
	my @disks = split /,/, $opt_testmode;

	for my $disk (@disks) {
	    push @$res, [-1, $disk, int((-s $disk)/512), "TESTDISK", 512];
	}
	return $res;
    }

    my $count = 0;

    foreach my $bd (</sys/block/*>) {
	next if $bd =~ m|^/sys/block/ram\d+$|;
	next if $bd =~ m|^/sys/block/loop\d+$|;
	next if $bd =~ m|^/sys/block/md\d+$|;
	next if $bd =~ m|^/sys/block/dm-.*$|;
	next if $bd =~ m|^/sys/block/fd\d+$|;
	next if $bd =~ m|^/sys/block/sr\d+$|;

	my $dev = file_read_firstline("$bd/dev");
	chomp $dev;

	next if !$dev;

	my $info = `udevadm info --path $bd --query all`;
	next if !$info;

	next if $info !~ m/^E: DEVTYPE=disk$/m;

	next if $info =~ m/^E: ID_CDROM/m;
	next if $info =~ m/^E: ID_FS_TYPE=iso9660/m;

	my ($name) = $info =~ m/^N: (\S+)$/m;

	if ($name) {
	    my $real_name = "/dev/$name";

	    my $size = file_read_firstline("$bd/size");
	    chomp $size;
	    $size = undef if !($size && $size =~ m/^\d+$/);

	    my $model = file_read_firstline("$bd/device/model") || '';
	    $model =~ s/^\s+//;
	    $model =~ s/\s+$//;
	    if (length ($model) > 30) {
		$model = substr ($model, 0, 30);
	    }

	    my $logical_bsize = file_read_firstline("$bd/queue/logical_block_size") // '';
	    chomp $logical_bsize;
	    $logical_bsize = undef if !($logical_bsize && $logical_bsize =~ m/^\d+$/);

	    push @$res, [$count++, $real_name, $size, $model, $logical_bsize] if $size;
	} else {
	    print STDERR "ERROR: unable to map device $dev ($bd)\n";
	}
    }

    return $res;
}

sub read_cmap {
    my $countryfn = "${proxmox_libdir}/country.dat";
    open (TMP, "<:encoding(utf8)", "$countryfn") || die "unable to open '$countryfn' - $!\n";
    my $line;
    my $country = {};
    my $countryhash = {};
    my $kmap = {};
    my $kmaphash = {};
    while (defined ($line = <TMP>)) {
	if ($line =~ m|^map:([^\s:]+):([^:]+):([^:]+):([^:]+):([^:]+):([^:]*):$|) {
	    $kmap->{$1} = {
		name => $2,
		kvm => $3,
		console => $4,
		x11 => $5,
		x11var => $6,
	    };
	    $kmaphash->{$2} = $1;
	} elsif ($line =~ m|^([a-z]{2}):([^:]+):([^:]*):([^:]*):$|) {
	    $country->{$1} = {
		name => $2,
		kmap => $3,
		mirror => $4,
	    };
	    $countryhash->{lc($2)} = $1;
	} else {
	    warn "unable to parse 'country.dat' line: $line";
	}
    }
    close (TMP);

    my $zones = {};
    my $cczones = {};
    my $zonefn = "/usr/share/zoneinfo/zone.tab";
    open (TMP, "<$zonefn") || die "unable to open '$zonefn' - $!\n";
    while (defined ($line = <TMP>)) {
	next if $line =~ m/^\#/;
	next if $line =~ m/^\s*$/;
	if ($line =~ m|^([A-Z][A-Z])\s+\S+\s+(([^/]+)/\S+)\s|) {
	    my $cc = lc($1);
	    $cczones->{$cc}->{$2} = 1;
	    $country->{$cc}->{zone} = $2 if !defined ($country->{$cc}->{zone});
	    $zones->{$2} = 1;

	}
    }
    close (TMP);

    return {
	zones => $zones,
	cczones => $cczones,
	country => $country,
	countryhash => $countryhash,
	kmap => $kmap,
	kmaphash => $kmaphash,
    }
}

# search for Harddisks
my $hds = hd_list();

sub hd_size {
    my ($dev) = @_;

    foreach my $hd (@$hds) {
	my ($disk, $devname, $size, $model, $logical_bsize) = @$hd;
	# size is always (also for 4kn disks) in 512B "sectors"! convert to KB
	return int($size/2) if $devname eq $dev;
    }

    die "no such device '$dev'\n";
}

sub logical_blocksize {
    my ($dev) = @_;

    foreach my $hd (@$hds) {
	my ($disk, $devname, $size, $model, $logical_bsize) = @$hd;
	return $logical_bsize if $devname eq $dev;
    }

    die "no such device '$dev'\n";
}

sub get_partition_dev {
    my ($dev, $partnum) = @_;

    if ($dev =~ m|^/dev/sd([a-h]?[a-z]\|i[a-v])$|) {
	return "${dev}$partnum";
    } elsif ($dev =~ m|^/dev/xvd[a-z]$|) {
	# Citrix Hypervisor blockdev
	return "${dev}$partnum";
    } elsif ($dev =~ m|^/dev/[hxev]d[a-z]$|) {
	return "${dev}$partnum";
    } elsif ($dev =~ m|^/dev/[^/]+/c\d+d\d+$|) {
	return "${dev}p$partnum";
    } elsif ($dev =~ m|^/dev/[^/]+/d\d+$|) {
	return "${dev}p$partnum";
    } elsif ($dev =~ m|^/dev/[^/]+/hd[a-z]$|) {
	return "${dev}$partnum";
    } elsif ($dev =~ m|^/dev/nvme\d+n\d+$|) {
	return "${dev}p$partnum";
    } else {
	die "unable to get device for partition $partnum on device $dev\n";
    }

}

sub file_get_contents {
    my ($filename, $max) = @_;

    my $fh = IO::File->new($filename, "r") ||
	die "can't open '$filename' - $!\n";

    local $/; # slurp mode

    my $content = <$fh>;

    close $fh;

    return $content;
}

sub write_config {
    my ($text, $filename) = @_;

    my $fd = IO::File->new(">$filename") ||
	die "unable to open file '$filename' - $!\n";
    print $fd $text;
    $fd->close();
}

sub update_progress {
    my ($frac, $start, $end, $text) = @_;

    my $part = $end - $start;
    my $res = $start + $frac*$part;

    $progress->set_fraction ($res);
    $progress->set_text (sprintf ("%d%%", int ($res*100)));
    $progress_status->set_text ($text) if defined ($text);

    display_info() if $res < 0.9;

    Gtk3::main_iteration() while Gtk3::events_pending();
}

my $fssetup = {
    ext3 => {
	mkfs => 'mkfs.ext3 -F',
	mkfs_root_opt => '',
	mkfs_data_opt => '-m 0',
	root_mountopt => 'errors=remount-ro',
    },
    ext4 => {
	mkfs => 'mkfs.ext4 -F',
	mkfs_root_opt => '',
	mkfs_data_opt => '-m 0',
	root_mountopt => 'errors=remount-ro',
    },
    xfs => {
	mkfs => 'mkfs.xfs -f',
	mkfs_root_opt => '',
	mkfs_data_opt => '',
	root_mountopt => '',
    },
};

sub create_filesystem {
    my ($dev, $name, $type, $start, $end, $fs, $fe) = @_;

    my $range = $end - $start;
    my $rs = $start + $range*$fs;
    my $re = $start + $range*$fe;
    my $max = 0;

    my $fsdata = $fssetup->{$type} || die "internal error - unknown file system '$type'";
    my $opts = $name eq 'root' ? $fsdata->{mkfs_root_opt} : $fsdata->{mkfs_data_opt};

    update_progress(0, $rs, $re, "creating $name filesystem");

    run_command("$fsdata->{mkfs} $opts $dev", sub {
	my $line = shift;

	if ($line =~ m/Writing inode tables:\s+(\d+)\/(\d+)/) {
	    $max = $2;
	} elsif ($max && $line =~ m/(\d+)\/$max/) {
	    update_progress(($1/$max)*0.9, $rs, $re);
	} elsif ($line =~ m/Creating journal.*done/) {
	    update_progress(0.95, $rs, $re);
	} elsif ($line =~ m/Writing superblocks and filesystem.*done/) {
	    update_progress(1, $rs, $re);
	}
    });
}

sub debconfig_set {
    my ($targetdir, $dcdata) = @_;

    my $cfgfile = "/tmp/debconf.txt";
    write_config($dcdata, "$targetdir/$cfgfile");
    syscmd("chroot $targetdir debconf-set-selections $cfgfile");
    unlink "$targetdir/$cfgfile";
}

sub diversion_add {
    my ($targetdir, $cmd, $new_cmd) = @_;

    syscmd("chroot $targetdir dpkg-divert --package proxmox " .
	   "--add --rename $cmd") == 0 ||
	   die "unable to exec dpkg-divert\n";

    syscmd("ln -sf ${new_cmd} $targetdir/$cmd") == 0 ||
	die "unable to link diversion to ${new_cmd}\n";
}

sub diversion_remove {
    my  ($targetdir, $cmd) = @_;

    syscmd("mv $targetdir/${cmd}.distrib $targetdir/${cmd};") == 0 ||
	die "unable to remove $cmd diversion\n";

    syscmd("chroot $targetdir dpkg-divert --remove $cmd") == 0 ||
	die "unable to remove $cmd diversion\n";
}

sub btrfs_create {
    my ($partitions, $mode) = @_;

    die "unknown btrfs mode '$mode'"
	if !($mode eq 'single' || $mode eq 'raid0' ||
	     $mode eq 'raid1' || $mode eq 'raid10');

    my $cmd = ['mkfs.btrfs', '-f'];

    push @$cmd, '-d', $mode, '-m', $mode;

    push @$cmd, @$partitions;

    syscmd($cmd);
}

sub zfs_create_rpool {
    my ($vdev) = @_;

    my $cmd = "zpool create -f -o cachefile=none";

    $cmd .= " -o ashift=$config_options->{ashift}"
        if defined($config_options->{ashift});

    syscmd("$cmd $zfspoolname $vdev") == 0 ||
	die "unable to create zfs root pool\n";

    syscmd("zfs create $zfspoolname/ROOT")  == 0 ||
        die "unable to create zfs $zfspoolname/ROOT volume\n";

    if ($setup->{product} eq 'pve') {
	syscmd("zfs create $zfspoolname/data")  == 0 ||
	    die "unable to create zfs $zfspoolname/data volume\n";
    }

    syscmd("zfs create $zfspoolname/ROOT/$zfsrootvolname")  == 0 ||
	die "unable to create zfs $zfspoolname/ROOT/$zfsrootvolname volume\n";

    # disable atime during install
    syscmd("zfs set atime=off $zfspoolname") == 0 ||
	die "unable to set zfs properties\n";

    my $value = $config_options->{compress};
    syscmd("zfs set compression=$value $zfspoolname")
        if defined($value) && $value ne 'off';

    $value = $config_options->{checksum};
    syscmd("zfs set checksum=$value $zfspoolname")
        if defined($value) && $value ne 'on';

    $value = $config_options->{copies};
    syscmd("zfs set copies=$value $zfspoolname")
        if defined($value) && $value != 1;
}

my $udevadm_trigger_block = sub {
    my ($nowait) = @_;

    sleep(1) if !$nowait; # give kernel time to reread part table

    # trigger udev to create /dev/disk/by-uuid
    syscmd("udevadm trigger --subsystem-match block");
    syscmd("udevadm settle --timeout 10");
};

my $clean_disk = sub {
    my ($disk) = @_;

    my $partitions = `lsblk --output kname --noheadings --path --list $disk`;
    foreach my $part (split "\n", $partitions) {
	next if $part eq $disk;
	next if $part !~ /^\Q$disk\E/;
	eval { syscmd("pvremove -ff -y $part"); };
	eval { syscmd("zpool labelclear -f $part"); };
	eval { syscmd("dd if=/dev/zero of=$part bs=1M count=16"); };
    }
};

sub partition_bootable_disk {
    my ($target_dev, $maxhdsizegb, $ptype) = @_;

    die "too dangerous" if $opt_testmode;

    die "unknown partition type '$ptype'"
	if !($ptype eq '8E00' || $ptype eq '8300' || $ptype eq 'BF01');

    my $hdsize = hd_size($target_dev); # size in KB (1024 bytes)

    my $restricted_hdsize_mb = 0; # 0 ==> end of partition
    if ($maxhdsizegb) {
	my $maxhdsize = $maxhdsizegb * 1024 * 1024;
	if ($maxhdsize < $hdsize) {
	    $hdsize = $maxhdsize;
	    $restricted_hdsize_mb = int($hdsize/1024) . 'M';
	}
    }

    my $hdgb = int($hdsize/(1024*1024));
    die "hardisk '$target_dev' too small (${hdgb}GB)\n" if $hdgb < 8;

    syscmd("sgdisk -Z ${target_dev}");

    # 1 - BIOS boot partition (Grub Stage2): first free 1M
    # 2 - EFI ESP: next free 512M
    # 3 - OS/Data partition: rest, up to $maxhdsize in MB

    my $grubbootdev = get_partition_dev($target_dev, 1);
    my $efibootdev = get_partition_dev($target_dev, 2);
    my $osdev = get_partition_dev ($target_dev, 3);

    my $pcmd = ['sgdisk'];

    my $pnum = 2;
    push @$pcmd, "-n${pnum}:1M:+512M", "-t$pnum:EF00";

    $pnum = 3;
    push @$pcmd, "-n${pnum}:513M:${restricted_hdsize_mb}", "-t$pnum:$ptype";

    push @$pcmd, $target_dev;

    my $os_size = $hdsize - 513*1024; # 512M efi + 1M bios_boot + 1M alignment

    syscmd($pcmd) == 0 ||
	die "unable to partition harddisk '${target_dev}'\n";

    my $blocksize = logical_blocksize($target_dev);

    if ($blocksize != 4096) {
	$pnum = 1;
	$pcmd = ['sgdisk', '-a1', "-n$pnum:34:2047", "-t$pnum:EF02" , $target_dev];

	syscmd($pcmd) == 0 ||
	    die "unable to create bios_boot partition '${target_dev}'\n";
    }

    &$udevadm_trigger_block();

    foreach my $part ($efibootdev, $osdev) {
	syscmd("dd if=/dev/zero of=$part bs=1M count=256") if -b $part;
    }

    return ($os_size, $osdev, $efibootdev);
}

sub get_pv_list_from_vgname {
    my ($vgname) = @_;

    my $res;

    my $parser = sub {
	my $line = shift;
	$line =~ s/^\s+//;
	$line =~ s/\s+$//;
	return if !$line;
	my ($pv, $vg_uuid) = split(/\s+/, $line);

	if (!defined($res->{$vg_uuid}->{pvs})) {
	    $res->{$vg_uuid}->{pvs} = "$pv";
	} else {
	    $res->{$vg_uuid}->{pvs} .= ", $pv";
	}
    };
    run_command("pvs --noheadings -o pv_name,vg_uuid -S vg_name='$vgname'", $parser, undef, 1);

    return $res;
}

sub ask_existing_vg_rename_or_abort {
    my ($vgname) = @_;

    # this normally only happens if one put a disk with a PVE installation in
    # this server and that disk is not the installation target.
    my $duplicate_vgs = get_pv_list_from_vgname($vgname);
    return if !$duplicate_vgs;

    my $message = "Detected existing '$vgname' Volume Group(s)! Do you want to:\n";

    for my $vg_uuid (keys %$duplicate_vgs) {
	my $vg = $duplicate_vgs->{$vg_uuid};

	# no high randomnes properties, but this is only for the cases where
	# we either have multiple "$vgname" vgs from multiple old PVE disks, or
	# we have a disk with both a "$vgname" and "$vgname-old"...
	my $short_uid = sprintf "%08X", rand(0xffffffff);
	$vg->{new_vgname} = "$vgname-OLD-$short_uid";

	$message .= "rename VG backed by PV '$vg->{pvs}' to '$vg->{new_vgname}'\n";
    }
    $message .= "or cancel the installation?";

    my $dialog = Gtk3::MessageDialog->new($window, 'modal', 'question', 'ok-cancel', $message);
    my $response = $dialog->run();
    $dialog->destroy();

    if ($response eq 'ok') {
	for my $vg_uuid (keys %$duplicate_vgs) {
	    my $vg = $duplicate_vgs->{$vg_uuid};
	    my $new_vgname = $vg->{new_vgname};

	    syscmd("vgrename $vg_uuid $new_vgname") == 0 ||
		die "could not rename VG from '$vg->{pvs}' ($vg_uuid) to '$new_vgname'!\n";
	}
    } else {
	set_next("_Reboot", sub { exit (0); } );
	display_html("fail.htm");
	die "Cancled installation by user, due to already existing volume group '$vgname'\n";
    }
}

sub create_lvm_volumes {
    my ($lvmdev, $os_size, $swap_size) = @_;

    my $vgname = $setup->{product};

    ask_existing_vg_rename_or_abort($vgname);

    my $rootdev = "/dev/$vgname/root";
    my $datadev = "/dev/$vgname/data";
    my $swapfile;

    # we use --metadatasize 250k, which results in "pe_start = 512"
    # so pe_start is aligned on a 128k boundary (advantage for SSDs)
    syscmd("/sbin/pvcreate --metadatasize 250k -y -ff $lvmdev") == 0 ||
	die "unable to initialize physical volume $lvmdev\n";
    syscmd("/sbin/vgcreate $vgname $lvmdev") == 0 ||
	die "unable to create volume group '$vgname'\n";

    my $hdgb = int($os_size/(1024*1024));
    my $space = (($hdgb > 128) ? 16 : ($hdgb/8))*1024*1024;

    my $rootsize;
    my $datasize;

    if ($setup->{product} eq 'pve') {

	my $maxroot;
	if ($config_options->{maxroot}) {
	    $maxroot = $config_options->{maxroot};
	} else {
	    $maxroot = 96;
	}

	$rootsize = (($hdgb > ($maxroot*4)) ? $maxroot : $hdgb/4)*1024*1024;

	my $rest = $os_size - $swap_size - $rootsize; # in KB

	my $minfree;
	if (defined($config_options->{minfree})) {
	    $minfree = (($config_options->{minfree}*1024*1024) >= $rest ) ? $space :
		$config_options->{minfree}*1024*1024 ;
	} else {
	    $minfree = $space;
	}

	$rest = $rest - $minfree;

	if (defined($config_options->{maxvz})) {
	    $rest = (($config_options->{maxvz}*1024*1024) <= $rest) ?
		$config_options->{maxvz}*1024*1024 : $rest;
	}

	$datasize = $rest;

    } else {
	my $minfree = defined($config_options->{minfree}) ? $config_options->{minfree}*1024*1024 : $space;
	$rootsize = $os_size - $minfree - $swap_size; # in KB
    }

    if ($swap_size) {
	syscmd("/sbin/lvcreate -L${swap_size}K -nswap $vgname") == 0 ||
	    die "unable to create swap volume\n";

	$swapfile = "/dev/$vgname/swap";
    }

    syscmd("/sbin/lvcreate -L${rootsize}K -nroot $vgname") == 0 ||
	die "unable to create root volume\n";

    if ($datasize > 4*1024*1024) {
	my $metadatasize = $datasize/100; # default 1% of data
	$metadatasize = 1024*1024 if $metadatasize < 1024*1024; # but at least 1G
	$metadatasize = 16*1024*1024 if $metadatasize > 16*1024*1024; # but at most 16G

	# otherwise the metadata is taken out of $minfree
	$datasize -= 2*$metadatasize;

	# 1 4MB PE to allow for rounding
	$datasize -= 4*1024;

	syscmd("/sbin/lvcreate -L${datasize}K -ndata $vgname") == 0 ||
	    die "unable to create data volume\n";

	syscmd("/sbin/lvconvert --yes --type thin-pool --poolmetadatasize ${metadatasize}K $vgname/data") == 0 ||
	    die "unable to create data thin-pool\n";
    } else {
	$datadev = undef;
    }

    syscmd("/sbin/vgchange -a y $vgname") == 0 ||
	die "unable to activate volume group\n";

    return ($rootdev, $swapfile, $datadev);
}

sub compute_swapsize {
    my ($hdsize) = @_;

    my $hdgb = int($hdsize/(1024*1024));

    my $swapsize;
    if (defined($config_options->{swapsize})) {
	$swapsize = $config_options->{swapsize}*1024*1024;
    } else {
	my $ss = int ($total_memory / 1024);
	$ss = 4 if $ss < 4;
	$ss = ($hdgb/8) if $ss > ($hdgb/8);
	$ss = 8 if $ss > 8;
	$swapsize = $ss*1024*1024;
    }

    return $swapsize;
}

sub prepare_systemd_boot_esp {
    my ($espdev, $targetdir) = @_;

    syscmd("chroot $targetdir pve-efiboot-tool init $espdev") == 0 ||
	die "unable to init ESP and install systemd-boot loader on '$espdev'\n";
}

sub prepare_grub_efi_boot_esp {
    my ($dev, $espdev, $targetdir) = @_;

    syscmd("mount -n $espdev -t vfat $targetdir/boot/efi") == 0 ||
	die "unable to mount $espdev\n";

    eval {
	my $rc = syscmd("chroot $targetdir /usr/sbin/grub-install --target x86_64-efi --no-floppy --bootloader-id='proxmox' $dev");
	if ($rc != 0) {
	    if ($boot_type eq 'efi') {
		die "unable to install the EFI boot loader on '$dev'\n";
	    } else {
		warn "unable to install the EFI boot loader on '$dev', ignoring (not booted using UEFI)\n";
	    }
	}
	# also install fallback boot file (OVMF does not boot without)
	mkdir("$targetdir/boot/efi/EFI/BOOT");
	syscmd("cp $targetdir/boot/efi/EFI/proxmox/grubx64.efi $targetdir/boot/efi/EFI/BOOT/BOOTx64.EFI") == 0 ||
	    die "unable to copy efi boot loader\n";
    };
    my $err = $@;

    eval {
	syscmd("umount $targetdir/boot/efi") == 0 ||
	    die "unable to umount $targetdir/boot/efi\n";
    };
    warn $@ if $@;

    die "failed to prepare EFI boot using Grub on '$espdev': $err" if $err;
}

sub extract_data {
    my ($basefile, $targetdir) = @_;

    die "target '$targetdir' does not exist\n" if ! -d  $targetdir;

    my $starttime = [Time::HiRes::gettimeofday];

    my $bootdevinfo = [];

    my $swapfile;
    my $rootdev;
    my $datadev;

    my $use_zfs = 0;
    my $use_btrfs = 0;

    my $filesys = $config_options->{filesys};

    if ($filesys =~ m/zfs/) {
	$target_hd = undef; # do not use this config
	$use_zfs = 1;
	$targetdir = "/$zfspoolname/ROOT/$zfsrootvolname";
    } elsif ($filesys =~ m/btrfs/) {
	$target_hd = undef; # do not use this config
	$use_btrfs = 1;
    }

    if ($use_zfs) {
	my $i;
	for ($i = 5; $i > 0; $i--) {
	    syscmd("modprobe zfs");
	    last if -c "/dev/zfs";
	    sleep(1);
	}

	die "unable to load zfs kernel module\n" if !$i;
    }

    my $bootloader_err;

    eval {


	my $maxper = 0.25;

	update_progress(0, 0, $maxper, "create partitions");

	syscmd("vgchange -an") if !$opt_testmode; # deactivate all detected VGs

	if ($opt_testmode) {

	    $rootdev = abs_path($opt_testmode);
	    syscmd("umount $rootdev");

	    if ($use_btrfs) {

		die "unsupported btrfs mode (for testing environment)\n"
		    if $filesys ne 'btrfs (RAID0)';

		btrfs_create([$rootdev], 'single');

	    } elsif ($use_zfs) {

		die "unsupported zfs mode (for testing environment)\n"
		    if $filesys ne 'zfs (RAID0)';

		syscmd("zpool destroy $zfstestpool");

		zfs_create_rpool($rootdev);

	    } else {

		# nothing to do
	    }

	} elsif ($use_btrfs) {

	    my ($devlist, $btrfs_mode) = get_btrfs_raid_setup();
	    my $btrfs_partitions = [];
	    my $disksize;
	    foreach my $hd (@$devlist) {
		my $devname = @$hd[1];
		my $logical_bsize = @$hd[4];

		&$clean_disk($devname);
		my ($size, $osdev, $efidev) =
		    partition_bootable_disk($devname, undef, '8300');
		$rootdev = $osdev if !defined($rootdev); # simply point to first disk
		my $by_id = find_stable_path("/dev/disk/by-id", $devname);
		push @$bootdevinfo, {
		    esp => $efidev,
		    devname => $devname,
		    osdev => $osdev,
		    by_id => $by_id,
		    logical_bsize => $logical_bsize,
		};
		push @$btrfs_partitions, $osdev;
		$disksize = $size;
	    }

	    &$udevadm_trigger_block();

	    btrfs_create($btrfs_partitions, $btrfs_mode);

	} elsif ($use_zfs) {

	    my ($devlist, $bootdevlist, $vdev) = get_zfs_raid_setup();

	    foreach my $hd (@$devlist) {
		&$clean_disk(@$hd[1]);
	    }

	    my $disksize;
	    foreach my $hd (@$bootdevlist) {
		my $devname = @$hd[1];
		my $logical_bsize = @$hd[4];

		my ($size, $osdev, $efidev) =
		    partition_bootable_disk($devname, $config_options->{hdsize}, 'BF01');

		zfs_mirror_size_check($disksize, $size) if $disksize;

		push @$bootdevinfo, {
		    esp => $efidev,
		    devname => $devname,
		    osdev => $osdev,
		    logical_bsize => $logical_bsize,
		};
		$disksize = $size;
	    }

	    &$udevadm_trigger_block();

	    foreach my $di (@$bootdevinfo) {
		my $devname = $di->{devname};
		$di->{by_id} = find_stable_path ("/dev/disk/by-id", $devname);

		my $osdev = find_stable_path ("/dev/disk/by-id", $di->{osdev}) || $di->{osdev};

		$vdev =~ s/ $devname/ $osdev/;
	    }

	    foreach my $hd (@$devlist) {
		my $devname = @$hd[1];
		my $by_id = find_stable_path ("/dev/disk/by-id", $devname);

		$vdev =~ s/ $devname/ $by_id/;
	    }

	    zfs_create_rpool($vdev);

	} else {

	    die "target '$target_hd' is not a valid block device\n" if ! -b $target_hd;

	    &$clean_disk($target_hd);

	    my $logical_bsize = logical_blocksize($target_hd);

	    my ($os_size, $osdev, $efidev);
	    ($os_size, $osdev, $efidev) =
		partition_bootable_disk($target_hd, $config_options->{hdsize}, '8E00');

	    &$udevadm_trigger_block();

	    my $by_id = find_stable_path ("/dev/disk/by-id", $target_hd);
	    push @$bootdevinfo, {
		esp => $efidev,
		devname => $target_hd,
		osdev => $osdev,
		by_id => $by_id,
		logical_bsize => $logical_bsize,
	    };

	    my $swap_size = compute_swapsize($os_size);
	    ($rootdev, $swapfile, $datadev) =
		create_lvm_volumes($osdev, $os_size, $swap_size);

	    # trigger udev to create /dev/disk/by-uuid
	    &$udevadm_trigger_block(1);
	}

	if ($use_zfs) {
	    # to be fast during installation
	    syscmd("zfs set sync=disabled $zfspoolname") == 0 ||
		die "unable to set zfs properties\n";
	}

	update_progress(0.03, 0, $maxper, "create swap space");
	if ($swapfile) {
	    syscmd("mkswap -f $swapfile") == 0 ||
		die "unable to create swap space\n";
	}

	update_progress(0.05, 0, $maxper, "creating filesystems");

	foreach my $di (@$bootdevinfo) {
	    next if !$di->{esp};
	    # FIXME remove '-s1' once https://github.com/dosfstools/dosfstools/issues/111 is fixed
	    my $vfat_extra_opts = ($di->{logical_bsize} == 4096) ? '-s1' : '';
	    syscmd("mkfs.vfat $vfat_extra_opts -F32 $di->{esp}") == 0 ||
		die "unable to initialize EFI ESP on device $di->{esp}\n";
	}

	if ($use_zfs) {
	    # do nothing
	} elsif ($use_btrfs) {
	    # do nothing
	} else {
	    create_filesystem($rootdev, 'root', $filesys, 0.05, $maxper, 0, 1);
	}

	update_progress(1, 0.05, $maxper, "mounting target $rootdev");

	if ($use_zfs) {
	    # do nothing
	} else {
	    my $mount_opts = 'noatime';
	    $mount_opts .= ',nobarrier'
		if $use_btrfs || $filesys =~ /^ext\d$/;

	    syscmd("mount -n $rootdev -o $mount_opts $targetdir") == 0 ||
		die "unable to mount $rootdev\n";
	}

	mkdir "$targetdir/boot";
	mkdir "$targetdir/boot/efi";

	mkdir "$targetdir/var";
	mkdir "$targetdir/var/lib";

	if ($setup->{product} eq 'pve') {
	    mkdir "$targetdir/var/lib/vz";
	    mkdir "$targetdir/var/lib/pve";

	    if ($use_btrfs) {
		syscmd("btrfs subvolume create $targetdir/var/lib/pve/local-btrfs") == 0 ||
		    die "unable to create btrfs subvolume\n";
	    }
	}

	mkdir "$targetdir/mnt";
	mkdir "$targetdir/mnt/hostrun";
	syscmd("mount --bind /run $targetdir/mnt/hostrun") == 0 ||
	    die "unable to bindmount run on $targetdir/mnt/hostrun\n";

	update_progress(1, 0.05, $maxper, "extracting base system");

	my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size) = stat ($basefile);
	$ino || die "unable to open file '$basefile' - $!\n";

	my $files = file_read_firstline("${proxmox_cddir}/proxmox/$setup->{product}-base.cnt") ||
	    die "unable to read base file count\n";

	my $per = 0;
	my $count = 0;

	run_command("unsquashfs -f -dest $targetdir -i $basefile", sub {
	    my $line = shift;
	    return if $line !~ m/^$targetdir/;
	    $count++;
	    my $nper = int (($count *100)/$files);
	    if ($nper != $per) {
		$per = $nper;
		my $frac = $per > 100 ? 1 : $per/100;
		update_progress($frac, $maxper, 0.5);
	    }
	});

	syscmd("mount -n -t tmpfs tmpfs $targetdir/tmp") == 0 ||
	    die "unable to mount tmpfs on $targetdir/tmp\n";
	syscmd("mount -n -t proc proc $targetdir/proc") == 0 ||
	    die "unable to mount proc on $targetdir/proc\n";
	syscmd("mount -n -t sysfs sysfs $targetdir/sys") == 0 ||
	    die "unable to mount sysfs on $targetdir/sys\n";
	if ($boot_type eq 'efi') {
	    syscmd("mount -n -t efivarfs efivarfs $targetdir/sys/firmware/efi/efivars") == 0 ||
		die "unable to mount efivarfs on $targetdir/sys/firmware/efi/efivars: $!\n";
	}
	syscmd("chroot $targetdir mount --bind /mnt/hostrun /run") == 0 ||
	    die "unable to re-bindmount hostrun on /run in chroot\n";

	update_progress(1, $maxper, 0.5, "configuring base system");

	# configure hosts

	my $hosts =
	    "127.0.0.1 localhost.localdomain localhost\n" .
	    "$ipaddress $hostname.$domain $hostname\n\n" .
	    "# The following lines are desirable for IPv6 capable hosts\n\n" .
	    "::1     ip6-localhost ip6-loopback\n" .
	    "fe00::0 ip6-localnet\n" .
	    "ff00::0 ip6-mcastprefix\n" .
	    "ff02::1 ip6-allnodes\n" .
	    "ff02::2 ip6-allrouters\n" .
	    "ff02::3 ip6-allhosts\n";

	write_config($hosts, "$targetdir/etc/hosts");

	write_config("$hostname\n", "$targetdir/etc/hostname");

	syscmd("/bin/hostname $hostname") if !$opt_testmode;

	# configure interfaces

	my $ifaces = "auto lo\niface lo inet loopback\n\n";

	my $ntype = $ipversion == 4 ? 'inet' : 'inet6';

	my $ethdev = $ipconf->{ifaces}->{$ipconf->{selected}}->{name};

	if ($setup->{bridged_network}) {
	    $ifaces .= "iface $ethdev $ntype manual\n";

	    $ifaces .=
		"\nauto vmbr0\niface vmbr0 $ntype static\n" .
		"\taddress $ipaddress\n" .
		"\tnetmask $netmask\n" .
		"\tgateway $gateway\n" .
		"\tbridge_ports $ethdev\n" .
		"\tbridge_stp off\n" .
		"\tbridge_fd 0\n";
	} else {
	    $ifaces .= "auto $ethdev\n" .
		"iface $ethdev $ntype static\n" .
		"\taddress $ipaddress\n" .
		"\tnetmask $netmask\n" .
		"\tgateway $gateway\n";
	}

	foreach my $iface (sort keys %{$ipconf->{ifaces}}) {
	    my $name = $ipconf->{ifaces}->{$iface}->{name};
	    next if $name eq $ethdev;

	    $ifaces .= "\niface $name $ntype manual\n";
	}

	write_config($ifaces, "$targetdir/etc/network/interfaces");

	# configure dns

	my $resolvconf = "search $domain\nnameserver $dnsserver\n";
	write_config($resolvconf, "$targetdir/etc/resolv.conf");

	# configure fstab

	my $fstab = "# <file system> <mount point> <type> <options> <dump> <pass>\n";

	if ($use_zfs) {
	    # do nothing
	} elsif ($use_btrfs) {
	    my $fsuuid;
	    my $cmd = "blkid -u filesystem -t TYPE=btrfs -o export $rootdev";
	    run_command($cmd, sub {
		my $line = shift;

		if ($line =~ m/^UUID=([A-Fa-f0-9\-]+)$/) {
		    $fsuuid = $1;
		}
	    });

	    die "unable to detect FS UUID" if !defined($fsuuid);

	    $fstab .= "UUID=$fsuuid / btrfs defaults 0 1\n";
	} else {
	    my $root_mountopt = $fssetup->{$filesys}->{root_mountopt} || 'defaults';
	    $fstab .= "$rootdev / $filesys ${root_mountopt} 0 1\n";
	}

	# mount /boot/efi
	# Note: this is required by current grub, but really dangerous, because
	# vfat does not have journaling, so it triggers manual fsck after each crash
	# so we only mount /boot/efi if really required (efi systems).
	if ($boot_type eq 'efi' && !$use_zfs) {
	    if (scalar(@$bootdevinfo)) {
		my $di = @$bootdevinfo[0]; # simply use first disk

		if ($di->{esp}) {
		    my $efi_boot_uuid = $di->{esp};
		    if (my $uuid = find_dev_by_uuid ($di->{esp})) {
			$efi_boot_uuid = "UUID=$uuid";
		    }

		    $fstab .= "${efi_boot_uuid} /boot/efi vfat defaults 0 1\n";
		}
	    }
	}


	$fstab .= "$swapfile none swap sw 0 0\n" if $swapfile;

	$fstab .= "proc /proc proc defaults 0 0\n";

	write_config($fstab, "$targetdir/etc/fstab");
	write_config("", "$targetdir/etc/mtab");

	syscmd("cp ${proxmox_libdir}/policy-disable-rc.d " .
		"$targetdir/usr/sbin/policy-rc.d") == 0 ||
		die "unable to copy policy-rc.d\n";
	syscmd("cp ${proxmox_libdir}/fake-start-stop-daemon " .
		"$targetdir/sbin/") == 0 ||
		die "unable to copy start-stop-daemon\n";

	diversion_add($targetdir, "/sbin/start-stop-daemon", "/sbin/fake-start-stop-daemon");
	diversion_add($targetdir, "/usr/sbin/update-grub", "/bin/true");
	diversion_add($targetdir, "/usr/sbin/update-initramfs", "/bin/true");

	my $machine_id = run_command("systemd-id128 new");
	die "unable to create a new machine-id\n" if ! $machine_id;
	write_config($machine_id, "$targetdir/etc/machine-id");

	syscmd("cp /etc/hostid $targetdir/etc/") == 0 ||
	    die "unable to copy hostid\n";

	syscmd("touch  $targetdir/proxmox_install_mode");

	my $grub_install_devices_txt = '';
	foreach my $di (@$bootdevinfo) {
	    $grub_install_devices_txt .= ', ' if $grub_install_devices_txt;
	    $grub_install_devices_txt .= $di->{by_id} || $di->{devname};
	}

	# Note: keyboard-configuration/xbkb-keymap is used by console-setup
	my $xkmap = $cmap->{kmap}->{$keymap}->{x11} // 'us';

	debconfig_set ($targetdir, <<_EOD);
locales locales/default_environment_locale select en_US.UTF-8
locales locales/locales_to_be_generated select en_US.UTF-8 UTF-8
samba-common samba-common/dhcp boolean false
samba-common samba-common/workgroup string WORKGROUP
postfix postfix/main_mailer_type select No configuration
keyboard-configuration keyboard-configuration/xkb-keymap select $xkmap
d-i debian-installer/locale select en_US.UTF-8
grub-pc grub-pc/install_devices select $grub_install_devices_txt
_EOD

	my $pkg_count = 0;
	while (<${proxmox_pkgdir}/*.deb>) { $pkg_count++ };

	# btrfs/dpkg is extremely slow without --force-unsafe-io
	my $dpkg_opts = $use_btrfs ? "--force-unsafe-io" : "";

	$count = 0;
	while (<${proxmox_pkgdir}/*.deb>) {
	    chomp;
	    my $path = $_;
	    my ($deb) = $path =~ m/${proxmox_pkgdir}\/(.*\.deb)/;
	    update_progress($count/$pkg_count, 0.5, 0.75, "extracting $deb");
	    print "extracting: $deb\n";
	    syscmd("cp $path $targetdir/tmp/$deb") == 0 ||
		die "installation of package $deb failed\n";
	    syscmd("chroot $targetdir dpkg $dpkg_opts --force-depends --no-triggers --unpack /tmp/$deb") == 0 ||
		die "installation of package $deb failed\n";
	    update_progress((++$count)/$pkg_count, 0.5, 0.75);
	}

	# needed for postfix postinst in case no other NIC is active
	syscmd("chroot $targetdir ifup lo");

	my $cmd = "chroot $targetdir dpkg $dpkg_opts --force-confold --configure -a";
	$count = 0;
	run_command($cmd, sub {
	    my $line = shift;
	    if ($line =~ m/Setting up\s+(\S+)/) {
		update_progress((++$count)/$pkg_count, 0.75, 0.95,
				"configuring $1");
	    }
	});

	unlink "$targetdir/etc/mailname";
	$postfix_main_cf =~ s/__FQDN__/${hostname}.${domain}/;
	write_config($postfix_main_cf, "$targetdir/etc/postfix/main.cf");

	# make sure we have all postfix directories
	syscmd("chroot $targetdir /usr/sbin/postfix check");
	# cleanup mail queue
	syscmd("chroot $targetdir /usr/sbin/postsuper -d ALL");
	# create /etc/aliases.db (/etc/aliases is shipped in the base squashfs)
	syscmd("chroot $targetdir /usr/bin/newaliases");

	# enable NTP (timedatectl set-ntp true  does not work without DBUS)
	syscmd("chroot $targetdir /bin/systemctl enable systemd-timesyncd.service");

	unlink  "$targetdir/proxmox_install_mode";

	# set timezone
	unlink ("$targetdir/etc/localtime");
	symlink ("/usr/share/zoneinfo/$timezone", "$targetdir/etc/localtime");
	write_config("$timezone\n", "$targetdir/etc/timezone");

	# set apt mirror
	if (my $mirror = $cmap->{country}->{$country}->{mirror}) {
	    my $fn = "$targetdir/etc/apt/sources.list";
	    syscmd("sed -i 's/ftp\\.debian\\.org/$mirror/' '$fn'");
	}

	# create extended_states for apt (avoid cron job warning if that
	# file does not exist)
	write_config('', "$targetdir/var/lib/apt/extended_states");

	# allow ssh root login
	syscmd(['sed', '-i', 's/^#\?PermitRootLogin.*/PermitRootLogin yes/', "$targetdir/etc/ssh/sshd_config"]);

	if ($setup->{product} eq 'pmg') {
	    # install initial clamav DB
	    my $srcdir = "${proxmox_cddir}/proxmox/clamav";
	    foreach my $fn ("main.cvd", "bytecode.cvd", "daily.cvd", "safebrowsing.cvd") {
		syscmd("cp \"$srcdir/$fn\" \"$targetdir/var/lib/clamav\"") == 0 ||
		    die "installation of clamav db file '$fn' failed\n";
	    }
	    syscmd("chroot $targetdir /bin/chown clamav:clamav -R /var/lib/clamav") == 0 ||
		die "unable to set owner for clamav database files\n";
	}

	if ($setup->{product} eq 'pve') {
	    # save installer settings
	    my $ucc = uc ($country);
	    debconfig_set($targetdir, "pve-manager pve-manager/country string $ucc\n");
	}

	update_progress(0.8, 0.95, 1, "make system bootable");

	if ($use_zfs) {
	    syscmd("sed -i -e 's/^GRUB_CMDLINE_LINUX=.*/GRUB_CMDLINE_LINUX=\"root=ZFS=$zfspoolname\\/ROOT\\/$zfsrootvolname boot=zfs\"/' $targetdir/etc/default/grub") == 0 ||
		die "unable to update /etc/default/grub\n";

	    if ($boot_type eq 'efi') {
		write_config("root=ZFS=$zfspoolname/ROOT/$zfsrootvolname boot=zfs", "$targetdir/etc/kernel/cmdline");
	    }

	}

	diversion_remove($targetdir, "/usr/sbin/update-grub");
	diversion_remove($targetdir, "/usr/sbin/update-initramfs");

	my $kapi;
	foreach my $fn (<$targetdir/lib/modules/*>) {
	    if ($fn =~ m!/(\d+\.\d+\.\d+-\d+-pve)$!) {
		die "found multiple kernels\n" if defined($kapi);
		$kapi = $1;
	    }
	}
	die "unable to detect kernel version\n" if !defined($kapi);

	if (!$opt_testmode) {

	    unlink ("$targetdir/etc/mtab");
	    symlink ("/proc/mounts", "$targetdir/etc/mtab");
	    syscmd("mount -n --bind /dev $targetdir/dev");

	    my $bootloader_err_list = [];
	    eval {
		syscmd("chroot $targetdir /usr/sbin/update-initramfs -c -k $kapi") == 0 ||
		    die "unable to install initramfs\n";

		my $native_4k_disk_bootable = 0;
		foreach my $di (@$bootdevinfo) {
		    $native_4k_disk_bootable |= ($di->{logical_bsize} == 4096);
		}

		foreach my $di (@$bootdevinfo) {
		    my $dev = $di->{devname};
		    if (!$native_4k_disk_bootable) {
			eval {
			    syscmd("chroot $targetdir /usr/sbin/grub-install --target i386-pc --no-floppy --bootloader-id='proxmox' $dev") == 0 ||
				    die "unable to install the i386-pc boot loader on '$dev'\n";
			};
			push @$bootloader_err_list, $@ if $@;
		    }

		    eval {
			if (my $esp = $di->{esp}) {
			    if ($use_zfs) {
				prepare_systemd_boot_esp($esp, $targetdir);
			    } else {
				prepare_grub_efi_boot_esp($dev, $esp, $targetdir);
			    }
			}
		    };
		    push @$bootloader_err_list, $@ if $@;
		}

		syscmd("chroot $targetdir /usr/sbin/update-grub") == 0 ||
		    die "unable to update boot loader config\n";
	    };
	    push @$bootloader_err_list, $@ if $@;

	    if (scalar(@$bootloader_err_list) > 0) {
		$bootloader_err = "bootloader setup errors:\n";
		map { $bootloader_err .= "- $_" } @$bootloader_err_list;
		warn $bootloader_err;
	    }

	    syscmd("umount $targetdir/dev");
	}

	# cleanup

	unlink "$targetdir/usr/sbin/policy-rc.d";

	diversion_remove($targetdir, "/sbin/start-stop-daemon");

	# set root password
	my $octets = encode("utf-8", $password);
	run_command("chroot $targetdir /usr/sbin/chpasswd", undef,
		    "root:$octets\n");

	if ($setup->{product} eq 'pmg') {
	    # save admin email
	    write_config("section: admin\n\temail ${mailto}\n",
			 "$targetdir/etc/pmg/pmg.conf");

	} elsif ($setup->{product} eq 'pve') {

	    # create pmxcfs DB

	    my $tmpdir = "$targetdir/tmp/pve";
	    mkdir $tmpdir;

	    # write vnc keymap to datacenter.cfg
	    my $vnckmap = $cmap->{kmap}->{$keymap}->{kvm} || 'en-us';
	    write_config("keyboard: $vnckmap\n",
			 "$tmpdir/datacenter.cfg");

	    # save admin email
	    write_config("user:root\@pam:1:0:::${mailto}::\n",
			 "$tmpdir/user.cfg");

	    # write storage.cfg
	    my $storage_cfg_fn = "$tmpdir/storage.cfg";
	    if ($use_zfs) {
		write_config($storage_cfg_zfs, $storage_cfg_fn);
	    } elsif ($use_btrfs) {
		write_config($storage_cfg_btrfs, $storage_cfg_fn);
	    } elsif ($datadev) {
		write_config($storage_cfg_lvmthin, $storage_cfg_fn);
	    } else {
		write_config($storage_cfg_local, $storage_cfg_fn);
	    }

	    run_command("chroot $targetdir /usr/bin/create_pmxcfs_db /tmp/pve /var/lib/pve-cluster/config.db");

	    syscmd("rm -rf $tmpdir");
	}
    };

    my $err = $@;

    update_progress(1, 0, 1, "");

    print $err if $err;

    if ($opt_testmode) {
	my $elapsed = Time::HiRes::tv_interval($starttime);
	print "Elapsed extract time: $elapsed\n";

	syscmd("chroot $targetdir /usr/bin/dpkg-query -W --showformat='\${package}\n'> final.pkglist");
    }

    syscmd("umount $targetdir/run");
    syscmd("umount $targetdir/mnt/hostrun");
    syscmd("umount $targetdir/tmp");
    syscmd("umount $targetdir/proc");
    syscmd("umount $targetdir/sys/firmware/efi/efivars");
    syscmd("umount $targetdir/sys");

    if ($use_zfs) {
	syscmd("zfs umount -a") == 0 ||
	    die "unable to unmount zfs\n";
    } else {
	syscmd("umount -d $targetdir");
    }

    if (!$err && $use_zfs) {
	syscmd("zfs set sync=standard $zfspoolname") == 0 ||
	    die "unable to set zfs properties\n";

	syscmd("zfs set mountpoint=/ $zfspoolname/ROOT/$zfsrootvolname") == 0 ||
	    die "zfs set mountpoint failed\n";

	syscmd("zpool set bootfs=$zfspoolname/ROOT/$zfsrootvolname $zfspoolname")  == 0 ||
	    die "zfs set bootfs failed\n";
	syscmd("zpool export $zfspoolname");
    }

    if ($bootloader_err) {
	$err = $err ? "$err\n$bootloader_err" : $bootloader_err;
    }

    die $err if $err;
}

my $last_display_change = 0;

my $display_info_counter = 0;

my $display_info_items = [
    "extract1-license.htm",
    "extract2-rulesystem.htm",
    "extract3-spam.htm",
    "extract4-virus.htm",
    ];

sub display_info {

    my $min_display_time = 15;

    my $ctime = time();

    return if ($ctime - $last_display_change) < $min_display_time;

    my $page = $display_info_items->[$display_info_counter % scalar(@$display_info_items)];

    $display_info_counter++;

    display_html($page);
}

sub display_html {
    my ($filename) = @_;

    $filename = $steps[$step_number]->{html} if !$filename;

    my $path = "${proxmox_libdir}/html/$filename";

    my $url = "file://$path";

    my $data = file_get_contents($path);

    if ($filename eq 'license.htm') {
	my $license = eval { decode('utf8', file_get_contents("${proxmox_cddir}/EULA")) };
	if (my $err = $@) {
	    die $err if !$opt_testmode;
	    $license = "TESTMODE: Ignore non existent EULA...\n";
	}
	my $title = "END USER LICENSE AGREEMENT (EULA)";
	$data =~ s/__LICENSE__/$license/;
	$data =~ s/__LICENSE_TITLE__/$title/;
    } elsif ($filename eq 'success.htm') {
	my $addr = $ipversion == 6 ? "[${ipaddress}]" : "$ipaddress";
	$data =~ s/\@IPADDR\@/$addr/;
    }

    $htmlview->load_html($data, $url);

    $last_display_change = time();
}

sub prev_function {

    my ($text, $fctn) = @_;

    $fctn = $step_number if !$fctn;
    $text = "_Previous" if !$text;
    $prev_btn->set_label ($text);

    $step_number--;
    $steps[$step_number]->{function}();

    $prev_btn->grab_focus();
}

sub set_next {
    my ($text, $fctn) = @_;

    $next_fctn = $fctn;
    my $step = $steps[$step_number];
    $text //= $steps[$step_number]->{next_button} // '_Next';
    $next->set_label($text);

    $next->grab_focus();
}

sub create_main_window {

    $window = Gtk3::Window->new();
    $window->set_default_size(1024, 768);
    $window->set_has_resize_grip(0);
    $window->set_decorated(0) if !$opt_testmode;

    my $vbox = Gtk3::VBox->new(0, 0);

    my $logofn = "$setup->{product}-banner.png";
    my $image = Gtk3::Image->new_from_file("${proxmox_libdir}/$logofn");
    $vbox->pack_start($image, 0, 0, 0);

    my $hbox = Gtk3::HBox->new(0, 0);
    $vbox->pack_start($hbox, 1, 1, 0);

 #  my $f1 = Gtk3::Frame->new ('test');
 #  $f1->set_shadow_type ('none');
 #  $hbox->pack_start ($f1, 1, 1, 0);

    my $sep1 = Gtk3::HSeparator->new();
    $vbox->pack_start($sep1, 0, 0, 0);

    $cmdbox = Gtk3::HBox->new();
    $vbox->pack_start($cmdbox, 0, 0, 10);

    $next = Gtk3::Button->new('_Next');
    $next->signal_connect(clicked => sub { $last_display_change = 0; &$next_fctn (); });
    $cmdbox->pack_end($next, 0, 0, 10);


    $prev_btn = Gtk3::Button->new('_Previous');
    $prev_btn->signal_connect(clicked => sub { $last_display_change = 0; &prev_function (); });
    $cmdbox->pack_end($prev_btn, 0, 0, 10);


    my $abort = Gtk3::Button->new('_Abort');
    $abort->set_can_focus(0);
    $cmdbox->pack_start($abort, 0, 0, 10);
    $abort->signal_connect(clicked => sub { exit (-1); });

    my $vbox2 = Gtk3::VBox->new(0, 0);
    $hbox->add($vbox2);

    $htmlview = Gtk3::WebKit2::WebView->new();
    my $scrolls = Gtk3::ScrolledWindow->new();
    $scrolls->add($htmlview);

    my $hbox2 = Gtk3::HBox->new(0, 0);
    $hbox2->pack_start($scrolls, 1, 1, 0);

    $vbox2->pack_start($hbox2, 1, 1, 0);

    my $vbox3 = Gtk3::VBox->new(0, 0);
    $vbox2->pack_start($vbox3, 0, 0, 0);

    my $sep2 = Gtk3::HSeparator->new;
    $vbox3->pack_start($sep2, 0, 0, 0);

    $inbox = Gtk3::HBox->new(0, 0);
    $vbox3->pack_start($inbox, 0, 0, 0);

    $window->add($vbox);

    $window->show_all;
    $window->realize();
}

sub cleanup_view {
    $inbox->foreach(sub {
	my $child = shift;
	$inbox->remove ($child);
    });
}

# fixme: newer GTK3 has special properties to handle numbers with Entry
# only allow floating point numbers with Gtk3::Entry

sub check_float {
    my ($entry, $event) = @_;

    return check_number($entry, $event, 1);
}

sub check_int {
    my ($entry, $event) = @_;

    return check_number($entry, $event, 0);
}

sub check_number {
    my ($entry, $event, $float) = @_;

    my $val = $event->get_keyval;

    if (($float && $val == ord '.') ||
	$val == Gtk3::Gdk::KEY_ISO_Left_Tab ||
	$val == Gtk3::Gdk::KEY_Shift_L ||
	$val == Gtk3::Gdk::KEY_Tab ||
	$val == Gtk3::Gdk::KEY_Left ||
	$val == Gtk3::Gdk::KEY_Right ||
	$val == Gtk3::Gdk::KEY_BackSpace ||
	$val == Gtk3::Gdk::KEY_Delete ||
	($val >= ord '0' && $val <= ord '9') ||
	($val >= Gtk3::Gdk::KEY_KP_0 &&
	 $val <= Gtk3::Gdk::KEY_KP_9)) {
	return undef;
    }

    return 1;
}

sub create_text_input {
    my ($default, $text) = @_;

    my $hbox = Gtk3::HBox->new(0, 0);

    my $label = Gtk3::Label->new($text);
    $label->set_size_request(150, -1);
    $label->set_alignment(1, 0.5);
    $hbox->pack_start($label, 0, 0, 10);
    my $e1 = Gtk3::Entry->new();
    $e1->set_width_chars(30);
    $hbox->pack_start($e1, 0, 0, 0);
    $e1->set_text($default);

    return ($hbox, $e1);
}

sub get_ip_config {

    my $ifaces = {};
    my $default;

    my $links = `ip -o l`;
    foreach my $l (split /\n/,$links) {
	my ($index, $name, $flags, $state, $mac) = $l =~ m/^(\d+):\s+(\S+):\s+<(\S+)>.*\s+state\s+(\S+)\s+.*\s+link\/ether\s+(\S+)\s+/;
	next if !$name || $name eq 'lo';

	my $driver = readlink "/sys/class/net/$name/device/driver" || 'unknown';
	$driver =~ s!^.*/!!;

	$ifaces->{"$index"} = {
	    name => $name,
	    driver => $driver,
	    flags => $flags,
	    state => $state,
	    mac => $mac,
	};

	my $addresses = `ip -o a s $name`;
	foreach my $a (split /\n/,$addresses) {
	    my ($family, $ip, $prefix) = $a =~ m/^\Q$index\E:\s+\Q$name\E\s+(inet|inet6)\s+($IPRE)\/(\d+)\s+/;
	    next if !$ip;
	    next if $a =~ /scope\s+link/; # ignore link local

	    my $mask = $prefix;

	    if ($family eq 'inet') {
		next if !$ip =~ /$IPV4RE/;
		next if $prefix < 8 || $prefix > 32;
		$mask = @$ipv4_reverse_mask[$prefix];
	    } else {
		next if !$ip =~ /$IPV6RE/;
	    }

	    $default = $index if !$default;

	    $ifaces->{"$index"}->{"$family"} = {
		mask => $mask,
		addr => $ip,
	    };
	}
    }


    my $route = `ip route`;
    my ($gateway) = $route =~ m/^default\s+via\s+(\S+)\s+/m;

    my $resolvconf = `cat /etc/resolv.conf`;
    my ($dnsserver) = $resolvconf =~ m/^nameserver\s+(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$/m;
    my ($domain) = $resolvconf =~ m/^domain\s+(\S+)$/m;

    return {
	default => $default,
	ifaces => $ifaces,
	gateway => $gateway,
	dnsserver => $dnsserver,
	domain => $domain,
    }
}

sub display_message {
    my ($msg) = @_;

    my $dialog = Gtk3::MessageDialog->new($window, 'modal',
					  'info', 'ok', $msg);
    $dialog->run();
    $dialog->destroy();
}

sub display_error {
    my ($msg) = @_;

    my $dialog = Gtk3::MessageDialog->new($window, 'modal',
					  'error', 'ok', $msg);
    $dialog->run();
    $dialog->destroy();
}

my $ipconf_first_view = 1;

sub create_ipconf_view {

    cleanup_view();
    display_html();

    my $vbox =  Gtk3::VBox->new(0, 0);
    $inbox->pack_start($vbox, 1, 0, 0);
    my $hbox =  Gtk3::HBox->new(0, 0);
    $vbox->pack_start($hbox, 0, 0, 10);
    my $vbox2 =  Gtk3::VBox->new(0, 0);
    $hbox->add($vbox2);

    my $ipaddr_text = $config->{ipaddress} // "192.168.100.2";
    my $ipbox;
    ($ipbox, $ipconf_entry_addr) =
	create_text_input($ipaddr_text, 'IP Address:');

    my $netmask_text = $config->{netmask} // "255.255.255.0";
    my $maskbox;
    ($maskbox, $ipconf_entry_mask) =
	create_text_input($netmask_text, 'Netmask:');

    my $device_cb = Gtk3::ComboBoxText->new();
    $device_cb->set_active(0);
    $device_cb->set_visible(1);

    my $get_device_desc = sub {
	my $iface = shift;
	return "$iface->{name} - $iface->{mac} ($iface->{driver})";
    };

    my $device_active_map = {};
    my $device_active_reverse_map = {};

    my $device_change_handler = sub {
	my $current = shift;

	my $new = $device_active_map->{$current->get_active()};
	return if defined($ipconf->{selected}) && $new eq $ipconf->{selected};

	$ipconf->{selected} = $new;
	my $iface = $ipconf->{ifaces}->{$ipconf->{selected}};
	$config->{mngmt_nic} = $iface->{name};
	$ipconf_entry_addr->set_text($iface->{inet}->{addr} || $iface->{inet6}->{addr})
	    if $iface->{inet}->{addr} || $iface->{inet6}->{addr};
	$ipconf_entry_mask->set_text($iface->{inet}->{mask} || $iface->{inet6}->{mask})
	    if $iface->{inet}->{mask} || $iface->{inet6}->{mask};
    };

    my $i = 0;
    foreach my $index (sort keys %{$ipconf->{ifaces}}) {
	$device_cb->append_text(&$get_device_desc($ipconf->{ifaces}->{$index}));
	$device_active_map->{$i} = $index;
	$device_active_reverse_map->{$ipconf->{ifaces}->{$index}->{name}} = $i;
	if ($ipconf_first_view && $index == $ipconf->{default}) {
	    $device_cb->set_active($i);
	    &$device_change_handler($device_cb);
	    $ipconf_first_view = 0;
	}
	$device_cb->signal_connect('changed' => $device_change_handler);
	$i++;
    }

    if (my $nic = $config->{mngmt_nic}) {
	$device_cb->set_active($device_active_reverse_map->{$nic} // 0);
    } else {
	$device_cb->set_active(0);
    }

    my $devicebox = Gtk3::HBox->new(0, 0);
    my $label = Gtk3::Label->new("Management Interface:");
    $label->set_size_request(150, -1);
    $label->set_alignment(1, 0.5);
    $devicebox->pack_start($label, 0, 0, 10);
    $devicebox->pack_start($device_cb, 0, 0, 0);

    $vbox2->pack_start($devicebox, 0, 0, 2);

    my $hn = $config->{fqdn} //  "$setup->{product}." . ($ipconf->{domain} // "example.invalid");

    my ($hostbox, $hostentry) =
	create_text_input($hn, 'Hostname (FQDN):');
    $vbox2->pack_start($hostbox, 0, 0, 2);

    $vbox2->pack_start($ipbox, 0, 0, 2);

    $vbox2->pack_start($maskbox, 0, 0, 2);

    $gateway = $config->{gateway} // $ipconf->{gateway} || '192.168.100.1';

    my $gwbox;
    ($gwbox, $ipconf_entry_gw) =
	create_text_input($gateway, 'Gateway:');

    $vbox2->pack_start($gwbox, 0, 0, 2);

    $dnsserver = $config->{dnsserver} // $ipconf->{dnsserver} || $gateway;

    my $dnsbox;
    ($dnsbox, $ipconf_entry_dns) =
	create_text_input($dnsserver, 'DNS Server:');

    $vbox2->pack_start($dnsbox, 0, 0, 0);

    $inbox->show_all;
    set_next(undef, sub {

	# verify hostname

	my $text = $hostentry->get_text();

	$text =~ s/^\s+//;
	$text =~ s/\s+$//;

	$config->{fqdn} = $text;

	my $namere = "([a-zA-Z0-9]([a-zA-Z0-9\-]*[a-zA-Z0-9])?)";

	# Debian does not support purely numeric hostnames
	if ($text && $text =~ /^[0-9]+(?:\.|$)/) {
	    display_message("Purely numeric hostnames are not allowed.");
	    $hostentry->grab_focus();
	    return;
	}

	if ($text && $text =~ m/^(${namere}\.)*${namere}$/ && $text !~ m/.example.invalid$/ &&
	    $text =~ m/^([^\.]+)\.(\S+)$/) {
	    $hostname = $1;
	    $domain = $2;
	} else {
	    display_message("Hostname does not look like a fully qualified domain name.");
	    $hostentry->grab_focus();
	    return;
	}

	# verify ip address

	$text = $ipconf_entry_addr->get_text();
	$text =~ s/^\s+//;
	$text =~ s/\s+$//;
	if ($text =~ m!^($IPV4RE)$!) {
	    $ipaddress = $text;
	    $ipversion = 4;
	} elsif ($text =~ m!^($IPV6RE)$!) {
	    $ipaddress = $text;
	    $ipversion = 6;
	} else {
	    display_message("IP address is not valid.");
	    $ipconf_entry_addr->grab_focus();
	    return;
	}
	$config->{ipaddress} = $ipaddress;

	$text = $ipconf_entry_mask->get_text();
	$text =~ s/^\s+//;
	$text =~ s/\s+$//;
	if (($ipversion == 6) && ($text =~ m/^(\d+)$/) && ($1 >= 8) && ($1 <= 126)) {
	    $netmask = $text;
	} elsif (($ipversion == 4) && defined($ipv4_mask_hash->{$text})) {
	    $netmask = $text;
	} else {
	    display_message("Netmask is not valid.");
	    $ipconf_entry_mask->grab_focus();
	    return;
	}
	$config->{netmask} = $netmask;

	$text = $ipconf_entry_gw->get_text();
	$text =~ s/^\s+//;
	$text =~ s/\s+$//;
	if (($ipversion == 4) && ($text =~ m!^($IPV4RE)$!)) {
	    $gateway = $text;
	} elsif (($ipversion == 6) && ($text =~ m!^($IPV6RE)$!)) {
	    $gateway = $text;
	} else {
	    display_message("Gateway is not valid.");
	    $ipconf_entry_gw->grab_focus();
	    return;
	}
	$config->{gateway} = $gateway;

	$text = $ipconf_entry_dns->get_text();
	$text =~ s/^\s+//;
	$text =~ s/\s+$//;
	if (($ipversion == 4) && ($text =~ m!^($IPV4RE)$!)) {
	    $dnsserver = $text;
	} elsif (($ipversion == 6) && ($text =~ m!^($IPV6RE)$!)) {
	    $dnsserver = $text;
	} else {
	    display_message("DNS server is not valid.");
	    $ipconf_entry_dns->grab_focus();
	    return;
	}
	$config->{dnsserver} = $dnsserver;

	#print "TEST $ipaddress $netmask $gateway $dnsserver\n";

	$step_number++;
	create_ack_view();
    });

    $hostentry->grab_focus();
}

sub create_ack_view {

    cleanup_view();

    my $ack_template = "${proxmox_libdir}/html/ack_template.htm";
    my $ack_html = "${proxmox_libdir}/html/$steps[$step_number]->{html}";
    my $html_data = file_get_contents($ack_template);

    my %config_values = (
	__target_hd__ => join(' | ', @{$config_options->{target_hds}}),
	__target_fs__ => $config_options->{filesys},
	__country__ => $cmap->{country}->{$country}->{name},
	__timezone__ => $timezone,
	__keymap__ => $keymap,
	__mailto__ => $mailto,
	__interface__ => $ipconf->{ifaces}->{$ipconf->{selected}}->{name},
	__hostname__ => $hostname,
	__ip__ => $ipaddress,
	__netmask__ => $netmask,
	__gateway__ => $gateway,
	__dnsserver__ => $dnsserver,
    );

    while ( my ($k, $v) = each %config_values) {
	$html_data =~ s/$k/$v/g;
    }

    write_config($html_data, $ack_html);

    display_html();

    set_next(undef, sub {
	$step_number++;
	create_extract_view();
    });
}

sub get_device_desc {
    my ($devname, $size, $model) = @_;

    if ($size && ($size > 0)) {
	$size = int($size/2048); # size in MB, from 512B "sectors"

	my $text = "$devname (";
	if ($size >= 1024) {
	    $size = int($size/1024); # size in GB
	    $text .= "${size}GB";
	} else {
	    $text .= "${size}MB";
	}

	$text .= ", $model" if $model;
	$text .= ")";

    } else {
	return $devname;
    }
}

sub update_layout {
    my ($cb, $kmap) = @_;

    my $ind;
    my $def;
    my $i = 0;
    my $kmaphash = $cmap->{kmaphash};
    foreach my $layout (sort keys %$kmaphash) {
	$def = $i if $kmaphash->{$layout} eq 'en-us';
	$ind = $i if $kmap && $kmaphash->{$layout} eq $kmap;
	$i++;
    }

    $cb->set_active($ind || $def || 0);
}

my $lastzonecb;
sub update_zonelist {
    my ($box, $cc) = @_;

    my $cczones = $cmap->{cczones};
    my $zones = $cmap->{zones};

    my $sel;
    if ($lastzonecb) {
	$sel = $lastzonecb->get_active_text();
	$box->remove ($lastzonecb);
    } else {
	$sel = $timezone; # used once to select default
    }

    my $cb = $lastzonecb = Gtk3::ComboBoxText->new();
    $cb->set_size_request(200, -1);

    $cb->signal_connect('changed' => sub {
	$timezone = $cb->get_active_text();
    });

    my @za;
    if ($cc && defined ($cczones->{$cc})) {
	@za = keys %{$cczones->{$cc}};
    } else {
	@za = keys %$zones;
    }
    my $ind;
    my $i = 0;
    foreach my $zone (sort @za) {
	$ind = $i if $sel && $zone eq $sel;
	$cb->append_text($zone);
	$i++;
    }

    $cb->set_active($ind || 0);

    $cb->show;
    $box->pack_start($cb, 0, 0, 0);
}

sub create_password_view {

    cleanup_view();

    my $vbox2 =  Gtk3::VBox->new(0, 0);
    $inbox->pack_start($vbox2, 1, 0, 0);
    my $vbox =  Gtk3::VBox->new(0, 0);
    $vbox2->pack_start($vbox, 0, 0, 10);

    my $hbox1 = Gtk3::HBox->new(0, 0);
    my $label = Gtk3::Label->new("Password");
    $label->set_size_request(150, -1);
    $label->set_alignment(1, 0.5);
    $hbox1->pack_start($label, 0, 0, 10);
    my $pwe1 = Gtk3::Entry->new();
    $pwe1->set_visibility(0);
    $pwe1->set_text($password) if $password;
    $pwe1->set_size_request(200, -1);
    $hbox1->pack_start($pwe1, 0, 0, 0);

    my $hbox2 = Gtk3::HBox->new(0, 0);
    $label = Gtk3::Label->new("Confirm");
    $label->set_size_request(150, -1);
    $label->set_alignment(1, 0.5);
    $hbox2->pack_start($label, 0, 0, 10);
    my $pwe2 = Gtk3::Entry->new();
    $pwe2->set_visibility(0);
    $pwe2->set_text($password) if $password;
    $pwe2->set_size_request(200, -1);
    $hbox2->pack_start($pwe2, 0, 0, 0);

    my $hbox3 = Gtk3::HBox->new(0, 0);
    $label = Gtk3::Label->new("E-Mail");
    $label->set_size_request(150, -1);
    $label->set_alignment(1, 0.5);
    $hbox3->pack_start($label, 0, 0, 10);
    my $eme = Gtk3::Entry->new();
    $eme->set_size_request(200, -1);
    $eme->set_text($mailto);
    $hbox3->pack_start($eme, 0, 0, 0);


    $vbox->pack_start($hbox1, 0, 0, 5);
    $vbox->pack_start($hbox2, 0, 0, 5);
    $vbox->pack_start($hbox3, 0, 0, 15);

    $inbox->show_all;

    display_html();

    set_next (undef,  sub {

	my $t1 = $pwe1->get_text;
	my $t2 = $pwe2->get_text;

	if (length ($t1) < 5) {
	    display_message("Password is too short.");
	    $pwe1->grab_focus();
	    return;
	}

	if ($t1 ne $t2) {
	    display_message("Password does not match.");
	    $pwe1->grab_focus();
	    return;
	}

	my $t3 = $eme->get_text;
	if ($t3 !~ m/^[\w\+\-\~]+(\.[\w\+\-\~]+)*@[a-zA-Z0-9\-]+(\.[a-zA-Z0-9\-]+)*$/) {
	    display_message("E-Mail does not look like a valid address" .
			     " (user\@domain.tld)");
	    $eme->grab_focus();
	    return;
	}

	if ($t3 eq 'mail@example.invalid') {
	    display_message("Please enter a valid E-Mail address");
	    $eme->grab_focus();
	    return;
	}

	$password = $t1;
	$mailto = $t3;

	$step_number++;
	create_ipconf_view();
    });

    $pwe1->grab_focus();

}

sub create_country_view {

    cleanup_view();

    my $countryhash = $cmap->{countryhash};
    my $ctr = $cmap->{country};

    my $vbox2 =  Gtk3::VBox->new(0, 0);
    $inbox->pack_start($vbox2, 1, 0, 0);
    my $vbox =  Gtk3::VBox->new(0, 0);
    $vbox2->pack_start($vbox, 0, 0, 10);

    my $w = Gtk3::Entry->new();
    $w->set_size_request(200, -1);

    my $c = Gtk3::EntryCompletion->new();
    $c->set_text_column(0);
    $c->set_minimum_key_length(0);
    $c->set_popup_set_width(1);
    $c->set_inline_completion(1);

    my $hbox2 = Gtk3::HBox->new(0, 0);
    my $label = Gtk3::Label->new("Time zone");
    $label->set_size_request(150, -1);
    $label->set_alignment(1, 0.5);
    $hbox2->pack_start($label, 0, 0, 10);
    update_zonelist ($hbox2);

    my $hbox3 = Gtk3::HBox->new(0, 0);
    $label = Gtk3::Label->new("Keyboard Layout");
    $label->set_size_request(150, -1);
    $label->set_alignment(1, 0.5);
    $hbox3->pack_start($label, 0, 0, 10);

    my $kmapcb = Gtk3::ComboBoxText->new();
    $kmapcb->set_size_request (200, -1);
    foreach my $layout (sort keys %{$cmap->{kmaphash}}) {
	$kmapcb->append_text ($layout);
    }

    update_layout($kmapcb);
    $hbox3->pack_start ($kmapcb, 0, 0, 0);

    $kmapcb->signal_connect ('changed' => sub {
	my $sel = $kmapcb->get_active_text();
	if (my $kmap = $cmap->{kmaphash}->{$sel}) {
	    my $xkmap = $cmap->{kmap}->{$kmap}->{x11};
	    my $xvar = $cmap->{kmap}->{$kmap}->{x11var};
	    syscmd ("setxkbmap $xkmap $xvar") if !$opt_testmode;
	    $keymap = $kmap;
	}
    });

    $w->signal_connect ('changed' => sub {
	my ($entry, $event) = @_;
	my $text = $entry->get_text;

	if (my $cc = $countryhash->{lc($text)}) {
	    update_zonelist($hbox2, $cc);
	    my $kmap = $ctr->{$cc}->{kmap} || 'en-us';
	    update_layout($kmapcb, $kmap);
	}
    });

    $w->signal_connect (key_press_event => sub {
	my ($entry, $event) = @_;
	my $text = $entry->get_text;

	my $val = $event->get_keyval;

	if ($val == Gtk3::Gdk::KEY_Tab) {
	    my $cc = $countryhash->{lc($text)};

	    my $found = 0;
	    my $compl;

	    if ($cc) {
		$found = 1;
		$compl = $ctr->{$cc}->{name};
	    } else {
		foreach my $cc (keys %$ctr) {
		    my $ct = $ctr->{$cc}->{name};
		    if ($ct =~ m/^\Q$text\E.*$/i) {
			$found++;
			$compl = $ct;
		    }
		    last if $found > 1;
		}
	    }

	    if ($found == 1) {
		$entry->set_text($compl);
		$c->complete();
		return undef;
	    } else {
		#Gtk3::Gdk::beep();
		print chr(7); # beep ?
	    }

	    $c->complete();

	    my $buf = $w->get_buffer();
	    $buf->insert_text(-1, '', -1); # popup selection

	    return 1;
	}

	return undef;
    });

    my $ls = Gtk3::ListStore->new('Glib::String');
    foreach my $cc (sort {$ctr->{$a}->{name} cmp $ctr->{$b}->{name} } keys %$ctr) {
	my $iter = $ls->append();
	$ls->set ($iter, 0, $ctr->{$cc}->{name});
    }
    $c->set_model ($ls);

    $w->set_completion ($c);

    my $hbox =  Gtk3::HBox->new(0, 0);

    $label = Gtk3::Label->new("Country");
    $label->set_alignment(1, 0.5);
    $label->set_size_request(150, -1);
    $hbox->pack_start($label, 0, 0, 10);
    $hbox->pack_start($w, 0, 0, 0);

    $vbox->pack_start($hbox, 0, 0, 5);
    $vbox->pack_start($hbox2, 0, 0, 5);
    $vbox->pack_start($hbox3, 0, 0, 5);

    if ($country && $ctr->{$country}) {
	$w->set_text ($ctr->{$country}->{name});
    }

    $inbox->show_all;

    display_html();
    set_next (undef,  sub {

	my $text = $w->get_text;

	if (my $cc = $countryhash->{lc($text)}) {
	    $country = $cc;
	    $step_number++;
	    create_password_view();
	    return;
	} else {
	    display_message("Please select a country first.");
	    $w->grab_focus();
	}
    });

    $w->grab_focus();
}

my $target_hd_combo;
my $target_hd_label;

my $hdoption_first_setup = 1;

my $create_basic_grid = sub {
    my $grid =  Gtk3::Grid->new();
    $grid->set_visible(1);
    $grid->set_column_spacing(10);
    $grid->set_row_spacing(10);
    $grid->set_hexpand(1);

    $grid->set_margin_start(5);
    $grid->set_margin_end(5);
    $grid->set_margin_top(5);
    $grid->set_margin_bottom(5);

    return $grid;
};

my $create_label_widget_grid = sub {
    my ($labeled_widgets) = @_;

    my $grid = &$create_basic_grid();
    my $row = 0;

    for (my $i = 0; $i < @$labeled_widgets; $i += 2) {
	my $widget = @$labeled_widgets[$i+1];
	my $label = Gtk3::Label->new(@$labeled_widgets[$i]);
	$label->set_visible(1);
	$label->set_alignment (1, 0.5);
	$grid->attach($label, 0, $row, 1, 1);
	$widget->set_visible(1);
	$grid->attach($widget, 1, $row, 1, 1);
	$row++;
    }

    return $grid;
};

my $create_raid_disk_grid = sub {
    my $disk_labeled_widgets = [];
    for (my $i = 0; $i < @$hds; $i++) {
	my $disk_selector = Gtk3::ComboBoxText->new();
	$disk_selector->append_text("-- do not use --");
	$disk_selector->set_active(0);
	$disk_selector->set_visible(1);
	foreach my $hd (@$hds) {
	    my ($disk, $devname, $size, $model, $logical_bsize) = @$hd;
	    $disk_selector->append_text(get_device_desc ($devname, $size, $model));
	    $disk_selector->{pve_disk_id} = $i;
	    $disk_selector->signal_connect (changed => sub {
		my $w = shift;
		my $diskid = $w->{pve_disk_id};
		my $a = $w->get_active - 1;
		$config_options->{"disksel${diskid}"} = ($a >= 0) ? $hds->[$a] : undef;
	    });
	}

	if ($hdoption_first_setup) {
	    $disk_selector->set_active ($i+1) if $hds->[$i];
	} else {
	    my $hdind = 0;
	    if (my $cur_hd = $config_options->{"disksel$i"}) {
		foreach my $hd (@$hds) {
		    if (@$hd[1] eq @$cur_hd[1]) {
			$disk_selector->set_active($hdind+1);
			last;
		    }
		    $hdind++;
		}
	    }
	}

	push @$disk_labeled_widgets, "Harddisk $i", $disk_selector;
    }

    my $scrolled_window = Gtk3::ScrolledWindow->new();
    $scrolled_window->set_hexpand(1);
    $scrolled_window->set_propagate_natural_height(1) if @$hds > 4;
    $scrolled_window->add(&$create_label_widget_grid($disk_labeled_widgets));
    $scrolled_window->set_policy('never', 'automatic');

    return $scrolled_window;
#    &$create_label_widget_grid($disk_labeled_widgets)
};

# shared between different ui parts (e.g., ZFS and "normal" single disk FS)
my $hdsize_size_adj;
my $hdsize_entry_buffer;

my $get_hdsize_spinbtn = sub {
    my $hdsize = shift;

    $hdsize_entry_buffer //= Gtk3::EntryBuffer->new(undef, 1);

    if (defined($hdsize)) {
	$hdsize_size_adj = Gtk3::Adjustment->new($config_options->{hdsize} || $hdsize, 0, $hdsize+1, 1, 1, 1);
    } else {
	die "called get_hdsize_spinbtn with \$hdsize_size_adj not defined but did not pass hdsize!\n"
	    if !defined($hdsize_size_adj);
    }

    my $spinbutton_hdsize = Gtk3::SpinButton->new($hdsize_size_adj, 1, 1);
    $spinbutton_hdsize->set_buffer($hdsize_entry_buffer);
    $spinbutton_hdsize->set_adjustment($hdsize_size_adj);
    $spinbutton_hdsize->set_tooltip_text("only use specified size (GB) of the harddisk (rest left unpartitioned)");
    return $spinbutton_hdsize;
};

my $create_raid_advanced_grid = sub {
    my $labeled_widgets = [];
    my $spinbutton_ashift = Gtk3::SpinButton->new_with_range(9,13,1);
    $spinbutton_ashift->set_tooltip_text("zpool ashift property (pool sector size, default 2^12)");
    $spinbutton_ashift->signal_connect ("value-changed" => sub {
	my $w = shift;
	$config_options->{ashift} = $w->get_value_as_int();
    });
    $config_options->{ashift} = 12 if ! defined($config_options->{ashift});
    $spinbutton_ashift->set_value($config_options->{ashift});
    push @$labeled_widgets, "ashift";
    push @$labeled_widgets, $spinbutton_ashift;

    my $combo_compress = Gtk3::ComboBoxText->new();
    $combo_compress->set_tooltip_text("zfs compression algorithm for rpool dataset");
    # note: gzip / lze not allowed for bootfs vdevs
    my $comp_opts = ["on","off","lzjb","lz4"];
    foreach my $opt (@$comp_opts) {
	$combo_compress->append($opt, $opt);
    }
    $config_options->{compress} = "on" if !defined($config_options->{compress});
    $combo_compress->set_active_id($config_options->{compress});
    $combo_compress->signal_connect (changed => sub {
	my $w = shift;
	$config_options->{compress} = $w->get_active_text();
    });
    push @$labeled_widgets, "compress";
    push @$labeled_widgets, $combo_compress;

    my $combo_checksum = Gtk3::ComboBoxText->new();
    $combo_checksum->set_tooltip_text("zfs checksum algorithm for rpool dataset");
    my $csum_opts = ["on", "off","fletcher2", "fletcher4", "sha256"];
    foreach my $opt (@$csum_opts) {
	$combo_checksum->append($opt, $opt);
    }
    $config_options->{checksum} = "on" if !($config_options->{checksum});
    $combo_checksum->set_active_id($config_options->{checksum});
    $combo_checksum->signal_connect (changed => sub {
	my $w = shift;
	$config_options->{checksum} = $w->get_active_text();
    });
    push @$labeled_widgets, "checksum";
    push @$labeled_widgets, $combo_checksum;

    my $spinbutton_copies = Gtk3::SpinButton->new_with_range(1,3,1);
    $spinbutton_copies->set_tooltip_text("zfs copies property for rpool dataset (in addition to RAID redundancy!)");
    $spinbutton_copies->signal_connect ("value-changed" => sub {
	my $w = shift;
	$config_options->{copies} = $w->get_value_as_int();
    });
    $config_options->{copies} = 1 if !defined($config_options->{copies});
    $spinbutton_copies->set_value($config_options->{copies});
    push @$labeled_widgets, "copies", $spinbutton_copies;

    push @$labeled_widgets, "hdsize", $get_hdsize_spinbtn->();
    return &$create_label_widget_grid($labeled_widgets);;
};

sub create_hdoption_view {

    my $dialog = Gtk3::Dialog->new();

    $dialog->set_title("Harddisk options");

    $dialog->add_button("_OK", 1);

    my $contarea = $dialog->get_content_area();

    my $hbox2 =  Gtk3::Box->new('horizontal', 0);
    $contarea->pack_start($hbox2, 1, 1, 10);

    my $grid =  Gtk3::Grid->new();
    $grid->set_column_spacing(10);
    $grid->set_row_spacing(10);

    $hbox2->pack_start($grid, 1, 0, 10);

    my $row = 0;

    # Filesystem type

    my $label0 = Gtk3::Label->new("Filesystem");
    $label0->set_alignment (1, 0.5);
    $grid->attach($label0, 0, $row, 1, 1);

    my $fstypecb = Gtk3::ComboBoxText->new();

    my $fstype = ['ext3', 'ext4', 'xfs',
		  'zfs (RAID0)', 'zfs (RAID1)',
		  'zfs (RAID10)', 'zfs (RAIDZ-1)',
		  'zfs (RAIDZ-2)', 'zfs (RAIDZ-3)'];

    push @$fstype, 'btrfs (RAID0)', 'btrfs (RAID1)', 'btrfs (RAID10)'
	if $setup->{enable_btrfs};

    my $tcount = 0;
    foreach my $tmp (@$fstype) {
	$fstypecb->append_text($tmp);
	$fstypecb->set_active ($tcount)
	    if $config_options->{filesys} eq $tmp;
	$tcount++;
    }

    $grid->attach($fstypecb, 1, $row, 1, 1);

    $hbox2->show_all();

    $row++;

    my $sep = Gtk3::HSeparator->new();
    $sep->set_visible(1);
    $grid->attach($sep, 0, $row, 2, 1);
    $row++;

    my $hw_raid_note = Gtk3::Label->new("Note: ZFS is not compatible with disks backed by a hardware RAID controller. For details see the reference documentation.");
    $hw_raid_note->set_line_wrap(1);
    $hw_raid_note->set_max_width_chars(30);
    $hw_raid_note->set_visible(0);
    $grid->attach($hw_raid_note, 0, $row++, 2, 1);

    my $hdsize_labeled_widgets = [];

    # size compute
    my $hdsize = 0;
    if ( -b $target_hd) {
	$hdsize = int(hd_size ($target_hd) / (1024*1024.0)); # size in GB
    } elsif ($target_hd) {
	$hdsize = int((-s $target_hd) / (1024*1024*1024.0));
    }

    my $spinbutton_hdsize = $get_hdsize_spinbtn->($hdsize);
    push @$hdsize_labeled_widgets, "hdsize", $spinbutton_hdsize;

    my $entry_swapsize = Gtk3::Entry->new();
    $entry_swapsize->set_tooltip_text("maximum SWAP size (GB)");
    $entry_swapsize->signal_connect (key_press_event => \&check_float);
    $entry_swapsize->set_text($config_options->{swapsize}) if defined($config_options->{swapsize});
    push @$hdsize_labeled_widgets, "swapsize", $entry_swapsize;

    my $entry_maxroot = Gtk3::Entry->new();
    if ($setup->{product} eq 'pve') {
	$entry_maxroot->set_tooltip_text("maximum size (GB) for LVM root volume");
	$entry_maxroot->signal_connect (key_press_event => \&check_float);
	$entry_maxroot->set_text($config_options->{maxroot}) if $config_options->{maxroot};
	push @$hdsize_labeled_widgets, "maxroot", $entry_maxroot;
    }

    my $entry_minfree = Gtk3::Entry->new();
    $entry_minfree->set_tooltip_text("minimum free LVM space (GB, required for LVM snapshots)");
    $entry_minfree->signal_connect (key_press_event => \&check_float);
    $entry_minfree->set_text($config_options->{minfree}) if defined($config_options->{minfree});
    push @$hdsize_labeled_widgets, "minfree", $entry_minfree;

    my $entry_maxvz;
    if ($setup->{product} eq 'pve') {
	$entry_maxvz = Gtk3::Entry->new();
	$entry_maxvz->set_tooltip_text("maximum size (GB) for LVM data volume");
	$entry_maxvz->signal_connect (key_press_event => \&check_float);
	$entry_maxvz->set_text($config_options->{maxvz}) if defined($config_options->{maxvz});
	push @$hdsize_labeled_widgets, "maxvz", $entry_maxvz;
    }

    my $options_stack = Gtk3::Stack->new();
    $options_stack->set_visible(1);
    $options_stack->set_hexpand(1);
    $options_stack->set_vexpand(1);
    $options_stack->add_titled(&$create_raid_disk_grid(), "raiddisk", "Disk Setup");
    $options_stack->add_titled(&$create_label_widget_grid($hdsize_labeled_widgets), "hdsize", "Size Options");
    $options_stack->add_titled(&$create_raid_advanced_grid("zfs"), "raidzfsadvanced", "Advanced Options");
    $options_stack->set_visible_child_name("raiddisk");
    my $options_stack_switcher = Gtk3::StackSwitcher->new();
    $options_stack_switcher->set_halign('center');
    $options_stack_switcher->set_stack($options_stack);
    $grid->attach($options_stack_switcher, 0, $row, 2, 1);
    $row++;
    $grid->attach($options_stack, 0, $row, 2, 1);
    $row++;

    $hdoption_first_setup = 0;

    my $switch_view = sub {
	my $raid = $config_options->{filesys} =~ m/zfs|btrfs/;
	my $enable_zfs_opts = $config_options->{filesys} =~ m/zfs/;

	$target_hd_combo->set_visible(!$raid);
	$options_stack->get_child_by_name("hdsize")->set_visible(!$raid);
	$options_stack->get_child_by_name("raiddisk")->set_visible($raid);
	$hw_raid_note->set_visible($raid);
	$options_stack_switcher->set_visible($enable_zfs_opts);
	$options_stack->get_child_by_name("raidzfsadvanced")->set_visible($enable_zfs_opts);
	if ($raid) {
	    $target_hd_label->set_text("Target: $config_options->{filesys} ");
	    $options_stack->set_visible_child_name("raiddisk");
	} else {
	    $target_hd_label->set_text("Target Harddisk: ");
	}
	my (undef, $pref_width) = $dialog->get_preferred_width();
	my (undef, $pref_height) = $dialog->get_preferred_height();
	$pref_height = 750 if $pref_height > 750;
	$dialog->resize($pref_width, $pref_height);
    };

    &$switch_view();

    $fstypecb->signal_connect (changed => sub {
	$config_options->{filesys} = $fstypecb->get_active_text();
	&$switch_view();
    });

    my $sep2 = Gtk3::HSeparator->new();
    $sep2->set_visible(1);
    $contarea->pack_end($sep2, 1, 1, 10);

    $dialog->show();

    $dialog->run();

    my $get_float = sub {
	my ($entry) = @_;

	my $text = $entry->get_text();
	return undef if !defined($text);

	$text =~ s/^\s+//;
	$text =~ s/\s+$//;

	return undef if $text !~ m/^\d+(\.\d+)?$/;

	return $text;
    };

    my $tmp;

    if (($tmp = &$get_float($spinbutton_hdsize)) && ($tmp != $hdsize)) {
	$config_options->{hdsize} = $tmp;
    } else {
	delete $config_options->{hdsize};
    }

    if (defined($tmp = &$get_float($entry_swapsize))) {
	$config_options->{swapsize} = $tmp;
    } else {
	delete $config_options->{swapsize};
    }

    if (defined($tmp = &$get_float($entry_maxroot))) {
	$config_options->{maxroot} = $tmp;
    } else {
	delete $config_options->{maxroot};
    }

    if (defined($tmp = &$get_float($entry_minfree))) {
	$config_options->{minfree} = $tmp;
    } else {
	delete $config_options->{minfree};
    }

    if ($entry_maxvz && defined($tmp = &$get_float($entry_maxvz))) {
	$config_options->{maxvz} = $tmp;
    } else {
	delete $config_options->{maxvz};
    }

    $dialog->destroy();
}

my $get_raid_devlist = sub {

    my $dev_name_hash = {};

    my $devlist = [];
    for (my $i = 0; $i < @$hds; $i++) {
	if (my $hd = $config_options->{"disksel$i"}) {
	    my ($disk, $devname, $size, $model, $logical_bsize) = @$hd;
	    die "device '$devname' is used more than once\n"
		if $dev_name_hash->{$devname};
	    $dev_name_hash->{$devname} = $hd;
	    push @$devlist, $hd;
	}
    }

    return $devlist;
};

sub zfs_mirror_size_check {
    my ($expected, $actual) = @_;

    die "mirrored disks must have same size\n"
	if abs($expected - $actual) > $expected / 10;
}

sub legacy_bios_4k_check {
    my ($lbs) = @_;
    die "Booting from 4kn drive in legacy BIOS mode is not supported.\n"
	if (($boot_type ne 'efi') && ($lbs == 4096));
}

sub get_zfs_raid_setup {

    my $filesys = $config_options->{filesys};

    my $devlist = &$get_raid_devlist();

    my $diskcount = scalar(@$devlist);
    die "$filesys needs at least one device\n" if $diskcount < 1;

    my $bootdevlist = [];

    my $cmd= '';
    if ($filesys eq 'zfs (RAID0)') {
	push @$bootdevlist, @$devlist[0];
	foreach my $hd (@$devlist) {
	    legacy_bios_4k_check(@$hd[4]);
	    $cmd .= " @$hd[1]";
	}
    } elsif ($filesys eq 'zfs (RAID1)') {
	die "zfs (RAID1) needs at least 2 device\n" if $diskcount < 2;
	$cmd .= ' mirror ';
	my $hd = @$devlist[0];
	my $expected_size = @$hd[2]; # all disks need approximately same size
	foreach $hd (@$devlist) {
	    zfs_mirror_size_check($expected_size, @$hd[2]);
	    legacy_bios_4k_check(@$hd[4]);
	    $cmd .= " @$hd[1]";
	    push @$bootdevlist, $hd;
	}
    } elsif ($filesys eq 'zfs (RAID10)') {
	die "zfs (RAID10) needs at least 4 device\n" if $diskcount < 4;
	die "zfs (RAID10) needs an even number of devices\n" if $diskcount & 1;

	push @$bootdevlist, @$devlist[0], @$devlist[1];

	for (my $i = 0; $i < $diskcount; $i+=2) {
	    my $hd1 = @$devlist[$i];
	    my $hd2 = @$devlist[$i+1];
	    zfs_mirror_size_check(@$hd1[2], @$hd2[2]); # pairs need approximately same size
	    legacy_bios_4k_check(@$hd1[4]);
	    legacy_bios_4k_check(@$hd2[4]);
	    $cmd .= ' mirror ' . @$hd1[1] . ' ' . @$hd2[1];
	}

    } elsif ($filesys =~ m/^zfs \(RAIDZ-([123])\)$/) {
	my $level = $1;
	my $mindisks = 2 + $level;
	die "zfs (RAIDZ-$level) needs at least $mindisks devices\n" if scalar(@$devlist) < $mindisks;
	my $hd = @$devlist[0];
	my $expected_size = @$hd[2]; # all disks need approximately same size
	$cmd .= " raidz$level";
	foreach $hd (@$devlist) {
	    zfs_mirror_size_check($expected_size, @$hd[2]);
	    legacy_bios_4k_check(@$hd[4]);
	    $cmd .= " @$hd[1]";
	    push @$bootdevlist, $hd;
	}
    } else {
	die "unknown zfs mode '$filesys'\n";
    }

    return ($devlist, $bootdevlist, $cmd);
}

sub get_btrfs_raid_setup {

    my $filesys = $config_options->{filesys};

    my $devlist = &$get_raid_devlist();

    my $diskcount = scalar(@$devlist);
    die "$filesys needs at least one device\n" if $diskcount < 1;

    my $mode;

    if ($diskcount == 1) {
	$mode = 'single';
    } else {
	if ($filesys eq 'btrfs (RAID0)') {
	    $mode = 'raid0';
	} elsif ($filesys eq 'btrfs (RAID1)') {
	    die "btrfs (RAID1) needs at least 2 device\n" if $diskcount < 2;
	    $mode = 'raid1';
	} elsif ($filesys eq 'btrfs (RAID10)') {
	    die "btrfs (RAID10) needs at least 4 device\n" if $diskcount < 4;
	    $mode = 'raid10';
	} else {
	    die "unknown btrfs mode '$filesys'\n";
	}
    }

    return ($devlist, $mode);
}

my $last_hd_selected = 0;
sub create_hdsel_view {

    $prev_btn->set_sensitive(1); # enable previous button at this point

    cleanup_view();

    my $vbox =  Gtk3::VBox->new(0, 0);
    $inbox->pack_start($vbox, 1, 0, 0);
    my $hbox =  Gtk3::HBox->new(0, 0);
    $vbox->pack_start($hbox, 0, 0, 10);

    my ($disk, $devname, $size, $model, $logical_bsize) = @{@$hds[0]};
    $target_hd = $devname if !defined($target_hd);

    $target_hd_label = Gtk3::Label->new("Target Harddisk: ");
    $hbox->pack_start($target_hd_label, 0, 0, 0);

    $target_hd_combo = Gtk3::ComboBoxText->new();

    foreach my $hd (@$hds) {
	($disk, $devname, $size, $model, $logical_bsize) = @$hd;
	$target_hd_combo->append_text (get_device_desc($devname, $size, $model));
    }

    my $raid = $config_options->{filesys} =~ m/zfs|btrfs/;
    if ($raid) {
	$target_hd_label->set_text("Target: $config_options->{filesys} ");
	$target_hd_combo->set_visible(0);
	$target_hd_combo->set_no_show_all(1);
    }
    $target_hd_combo->set_active($last_hd_selected);
    $target_hd_combo->signal_connect(changed => sub {
	$a = shift->get_active;
	my ($disk, $devname) = @{@$hds[$a]};
	$last_hd_selected = $a;
	$target_hd = $devname;
    });

    $hbox->pack_start($target_hd_combo, 0, 0, 10);

    my $options = Gtk3::Button->new('_Options');
    $options->signal_connect (clicked => \&create_hdoption_view);
    $hbox->pack_start ($options, 0, 0, 0);


    $inbox->show_all;

    display_html();

    set_next(undef, sub {

	if ($config_options->{filesys} =~ m/zfs/) {
	    my ($devlist) = eval { get_zfs_raid_setup() };
	    if (my $err = $@) {
		display_message("Warning: $err\nPlease fix ZFS setup first.");
		return;
	    }
	    $config_options->{target_hds} = [ map { $_->[1] } @$devlist ];
	} elsif ($config_options->{filesys} =~ m/btrfs/) {
	    my ($devlist) = eval { get_btrfs_raid_setup() };
	    if (my $err = $@) {
		display_message("Warning: $err\nPlease fix BTRFS setup first.");
		return;
	    }
	    $config_options->{target_hds} = [ map { $_->[1] } @$devlist ];
	} else {
	    eval { legacy_bios_4k_check(logical_blocksize($target_hd)) };
	    if (my $err = $@) {
		display_message("Warning: $err\n");
		return;
	    }
	    $config_options->{target_hds} = [ $target_hd ];
	}

	$step_number++;
	create_country_view();
    });
}

sub create_extract_view {

    cleanup_view();

    display_info();

    $next->set_sensitive(0);
    $prev_btn->set_sensitive(0);
    $prev_btn->hide();

    my $vbox =  Gtk3::VBox->new(0, 0);
    $inbox->pack_start ($vbox, 1, 0, 0);
    my $hbox =  Gtk3::HBox->new(0, 0);
    $vbox->pack_start ($hbox, 0, 0, 10);

    my $vbox2 =  Gtk3::VBox->new(0, 0);
    $hbox->pack_start ($vbox2, 0, 0, 0);

    $progress_status = Gtk3::Label->new('');
    $vbox2->pack_start ($progress_status, 1, 1, 0);

    $progress = Gtk3::ProgressBar->new;
    $progress->set_show_text(1);
    $progress->set_size_request (600, -1);

    $vbox2->pack_start($progress, 0, 0, 0);

    $inbox->show_all();

    my $tdir = $opt_testmode ? "target" : "/target";
    mkdir $tdir;
    my $base = "${proxmox_cddir}/$setup->{product}-base.squashfs";

    eval  { extract_data($base, $tdir); };
    my $err = $@;

    $next->set_sensitive(1);

    set_next("_Reboot", sub { exit (0); } );

    if ($err) {
	display_html("fail.htm");
	display_error($err);
    } else {
	cleanup_view();
	display_html("success.htm");
    }
}

sub create_intro_view {

    $prev_btn->set_sensitive(0);

    cleanup_view();

    if (int($total_memory) < 1024) {
	my $fullname = $product_fullname->{$setup->{product}};

	display_error("Less than 1 GiB of usable memory detected, installation will probably fail.\n\n".
	    "See 'System Requirements' in the $fullname documentation.");
    }

    if ($setup->{product} eq 'pve') {
	eval {
	    my $cpuinfo = file_get_contents('/proc/cpuinfo');
	    if ($cpuinfo && !($cpuinfo =~ /^flags\s*:.*(vmx|svm)/m)) {
		display_error("No support for KVM virtualization detected.\n\n" .
			      "Check BIOS settings for Intel VT / AMD-V / SVM.")
	    }
	};
    }

    display_html();

    $step_number++;
    set_next("I a_gree", \&create_hdsel_view);
}

$ipconf = get_ip_config();

$country = detect_country() if $ipconf->{default} || $opt_testmode;

# read country, kmap and timezone infos
$cmap = read_cmap();

if (!defined($cmap->{country}->{$country})) {
    print $logfd "ignoring detected country '$country', invalid or unknown\n";
    $country = undef;
}

create_main_window ();

my $initial_error = 0;

if (!defined ($hds) || (scalar (@$hds) <= 0)) {
    print "no hardisks found\n";
    $initial_error = 1;
    display_html("nohds.htm");
    set_next("Reboot", sub { exit(0); } );
} else {
    foreach my $hd (@$hds) {
	my ($disk, $devname) = @$hd;
	next if $devname =~ m|^/dev/md\d+$|;
	print "found Disk$disk N:$devname\n";
    }
}

if (!$initial_error && (scalar keys %{ $ipconf->{ifaces} } == 0)) {
    print "no network interfaces found\n";
    $initial_error = 1;
    display_html("nonics.htm");
    set_next("Reboot", sub { exit(0); } );
}

create_intro_view () if !$initial_error;

Gtk3->main;

exit 0;