path: root/lib/MGA/DrakISO/BuildRoot.pm

# Copyright (C) 2005 Mandriva
#                    Olivier Blin <oblin@mandriva.com>
# Copyright (C) 2017-2018 Mageia
#                    Martin Whitaker <mageia@martin-whitaker.me.uk>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA.

# SYNOPSIS
# --------
# This package provides functions to create and customise the root filesystem
# for a Live system.

package MGA::DrakISO::BuildRoot;

use strict;

use MDK::Common;
use common;

use File::Temp qw(tmpnam);
use Try::Tiny;
use urpm;
use urpm::media;
use urpm::select;

use MGA::DrakISO::LiveBuild;
use MGA::DrakISO::Loopback;
use MGA::DrakISO::Utils;

use Exporter;
our @ISA = qw(Exporter);
our @EXPORT = qw(install_live_system customise_live_system);

my $local_repo_dir = '/var/local/mga_rpms/';

###############################################################################
# System Installation
###############################################################################

# This is the top-level function called to create the basic root filesystem. It
# uses stage2 of the Mageia installer to do the actual work. It is independent
# of any other preparatory step.
#
# This function is largely derived from drakx_in_chroot.
#
sub install_live_system {
    my ($build) = @_;

    print "Installing Live system\n" if $::verbose;

    my $arch = $build->{settings}{arch};

    my $base_repository = $build->{settings}{repository};
    my $arch_repository = $base_repository . '/' . $arch;
    my $remote_method   = $arch_repository =~ m!^(ftp|http)://! && $1;

    my $chroot = $build->get_chroot_dir;

    my $rooted_stage2 = '/tmp/stage2';
    my $chroot_stage2 = $chroot . $rooted_stage2;

    my $live_root = $build->get_live_root;
    if (-e $live_root) {
        # We want a clean start...
        umount_all_in_root($live_root);
        run_as_root('rm', '-rf', $live_root);
    }
    mkdir_p($live_root);

    my $Xserver_pid;
    my $error_message;
    try {
        # Mount the directory where we want to install the Live system.
        mount($chroot . '/mnt', $live_root, '--bind');

        # Mount the standard system pseudo-filesystems, so that the installer
        # has a proper environment to run in.
        mount_system_fs($chroot);
        mount($chroot . '/sys/kernel/debug', 'none', '-t', 'debugfs');

        # Mount the stage2 installer filesystem.
        if ($remote_method) {
            mkdir_p($chroot . '/tmp');
            my $local_mdkinst = $chroot . '/tmp/mdkinst.sqfs';
            run_('curl', '--silent', '-o', $local_mdkinst, $arch_repository . '/install/stage2/mdkinst.sqfs')
              or die "ERROR: failed to download mdkinst.sqfs from remote repository\n";
            mount($chroot_stage2, $local_mdkinst, '-t', 'squashfs', '-o', 'loop,ro');

        } elsif (-d $arch_repository . '/install/stage2/live') {
            mount($chroot_stage2, $arch_repository . '/install/stage2/live', '--bind', '-o', 'ro');

        } elsif (-f $arch_repository . '/install/stage2/mdkinst.sqfs') {
            mount($chroot_stage2, $arch_repository . '/install/stage2/mdkinst.sqfs', '-t', 'squashfs', '-o', 'loop,ro');

        } else {
            die "ERROR: failed to find installer stage2\n";
        }

        # The stage2 installer expects to find the full repository in this
        # location...
        mount($chroot . '/tmp/media', $base_repository, '--bind', '-o', 'ro') if !$remote_method;
        # and the arch-specific repository in this location.
        symlinkf('media/' . $arch, $chroot . '/tmp/image');
        # Because the installer uses the above symlink, relative paths in
        # the urpmi configuration don't work unless we add this extra link.
        symlinkf('media/i586', $chroot . '/tmp/i586') if $arch eq 'x86_64';

        # If the user has provided an auto-install configuration file, use it,
        # otherwise construct one.
        my $rooted_auto_inst = '/tmp/auto_inst.cfg.pl';
        my $system_auto_inst = $build->get_absolute_path($build->{system}{auto_install});
        my $interactive;
        if (defined $system_auto_inst) {
            -f $system_auto_inst or die "ERROR: can't find the auto-install configuration file $system_auto_inst\n";
            cp_f($system_auto_inst, $chroot . $rooted_auto_inst);
        } else {
            write_auto_inst_cfg($build, $chroot . $rooted_auto_inst, \$interactive);
        }

        # Add a few more things to complete the installer's working environment.

        my $etc = $chroot . '/etc';
        mkdir_p($etc);
        output($etc . '/hosts', "127.0.0.1 localhost\n");

        my $var = $chroot . '/var';
        mkdir_p($var);

        create_initial_symlinks($chroot, $rooted_stage2);

        chomp(my $kernel_version = `uname -r`);
        my $modules_dir = '/modules/' . $kernel_version;
        output_p($chroot . $modules_dir . $_, "\n")
          foreach "/lib/$modules_dir/modules.dep", "/lib/$modules_dir/modules.alias";

        # If some of the installer steps will be interactive, we need to start a
        # nested X server to display the GUI.
        my $DISPLAY = '';
        if ($interactive) {
            my $Xserver = whereis_binary('Xephyr') || whereis_binary('Xnest')
              or die "ERROR: Xephyr or Xnest not found - cannot run installer GUI\n";
            my $screen_size = $Xserver =~ /Xephyr/ ? '-screen' : '-geometry';
            $DISPLAY = ':8';
            if ($Xserver_pid = fork()) {
            } else {
                close(STDOUT); open(STDOUT, '>', '/dev/null');
                close(STDERR); open(STDERR, '>', '/dev/null');
                exec($Xserver, $DISPLAY, '-ac', $screen_size, '1024x768');
            }
        }

        # Run the installer. The sudo command sets up a new environment,
        # so we need to set the variables we want after we've entered the
        # chroot.
        my $env = join(' ',
                    "PATH=/usr/sbin:/mnt/usr/sbin:/usr/bin:/mnt/usr/bin",
                    "LD_LIBRARY_PATH=/usr/lib:/mnt/usr/lib:/usr/lib64:/mnt/usr/lib64",
                    if_($remote_method, "URLPREFIX=$arch_repository"),
                    "DISPLAY=$DISPLAY",
                    "TERM=linux",
                    "HOME=/",
                  );
        my $cmd = "/usr/bin/runinstall2 --local_install --auto_install $rooted_auto_inst";
           $cmd .= " --method $remote_method" if $remote_method;
        run_in_root($chroot, $arch, 'sh', '-c', "$env $cmd")
          or die "ERROR: failed to install base system\n";

        # Add the release notes.
        for (qw(release-notes.html release-notes.txt)) {
            copy_file_to_root($live_root, '', 0644, $arch_repository . '/' . $_);
        }

        # Add a local repository if the user has requested it.
        build_local_repo($build);
    } catch {
        $error_message = $_;
    } finally {
        # During package installation, a dbus daemon may get automatically
        # launched in the Live system root. We need to kill it before we
        # can unmount the root filesystem.
        run_as_root('fuser', '-s', '-k', "$chroot/mnt");
        # Allow a bit of time for the processes to die.
        sleep(1);
        # Now we can unmount everything. The order is important.
        umount_all_in_root($live_root);
        umount_all_in_root($chroot);
        # And finally kill off our nested X server.
        kill(15, $Xserver_pid) if $Xserver_pid;
    };
    defined $error_message && die $error_message;
}

sub write_auto_inst_cfg {
    my ($build, $file, $interactive) = @_;

    my $region              = $build->{settings}{region};
    my $enabled_media       = $build->{system}{enabled_media};
    my $rpmsrate_flags      = $build->{system}{rpmsrate_flags};
    my $rpmsrate_level      = $build->{system}{rpmsrate_level} || 5;
    my $include_packages    = $build->{system}{include_packages};
    my $exclude_packages    = $build->{system}{exclude_packages};
    my $preferred_packages  = $build->{system}{preferred_packages};
    my $local_repo_packages = $build->{system}{local_repo_packages};
    my @desktops            = split(/\|/, $build->{settings}{desktop});
    my $default_user        = $build->{settings}{default_user};
    my $post_install_nr     = $build->{system}{post_install_nr};
    my $post_install        = $build->{system}{post_install};

    $$interactive = !$region || !$enabled_media || !$rpmsrate_flags || !$default_user;

    my @text;
    push @text, (
        "\$o = {",
        "    security => 1,",
        "    authentication => {",
        "        shadow     => 1,",
        "        local      => 1,",
        "        blowfish   => 1,",
        "    },",
    );
    push @text, (
        "    interactiveSteps => [",
      if_(!$region,
        "        'selectLanguage',",
        "        'selectKeyboard',",
      ),
      if_(!$enabled_media,
        "        'chooseMedia',",
      ),
      if_(!$rpmsrate_flags,
        "        'choosePackages',",
      ),
      if_(!$default_user,
        "        'addUser',",
      ),
        "    ],",
    ) if $$interactive;
    push @text, (
        "    media => [",
        "        {",
        "            type => 'media_cfg',",
        "            url => 'drakx://media',",
        "            selected_names => '" . join(', ', @$enabled_media) . "',",
        "        },",
        "    ],",
        "    # temporary (?) fix for mga#12299",
        "    enabled_media => [ " . join(', ', map { "'$_'" } @$enabled_media) . " ],",
    ) if $enabled_media;
    push @text, (
        "    rpmsrate_flags_chosen => {",
 (map { "        $_ => 1," } @$rpmsrate_flags),
        "    },",
        "    compssListLevel => $rpmsrate_level,",
    ) if $rpmsrate_flags;
    push @text, (
        "    default_packages => [",
 (map { "        '$_'," } @$include_packages),
        "    ],",
    ) if $include_packages;
    push @text, (
        "    skipped_packages => [",
 (map { "        '$_'," } (@$exclude_packages, @$local_repo_packages)),
        "    ],",
    ) if $exclude_packages;
    push @text, (
        "    preferred_packages => '" . join(', ', @$preferred_packages) . "',",
    ) if $preferred_packages;
    push @text, (
        "    meta_class => 'desktop',",
        "    desktop => '$desktops[0]',",
    ) if @desktops;
    push @text, (
        "    autologin => '$default_user',",
        "    users => [",
        "      {",
        "        realname   => '',",
        "        name       => '$default_user',",
        "        shell      => '/bin/bash',",
        "        icon       => 'default',",
        "        groups     => [],",
        "        gid        => '',",
        "        uid        => '',",
        "      },",
        "    ],",
        "    superuser => {",
        "        pw         => '',",
        "        realname   => 'root',",
        "        shell      => '/bin/bash',",
        "        home       => '/root',",
        "        gid        => '0',",
        "        uid        => '0',",
        "    },",
    ) if $default_user;
    push @text, (
        "    locale => {",
        "        lang       => 'en_US',",
        "        country    => 'US',",
        "        IM         => undef,",
      if_($region ne 'all',
        "        langs      => { " . join(', ', map { "$_ => 1" } $build->get_langs) . " },",
      ),
      if_($region eq 'all',
        "        langs      => { all => 1 },",
      ),
        "        utf8       => 1,",
        "    },",
        "    keyboard => {",
        "        KEYBOARD   => 'us',",
        "        KEYTABLE   => 'us',",
        "        KBCHARSET  => 'C',",
        "        GRP_TOGGLE => '',",
        "    },",
        "    timezone => {",
        "        ntp        => undef,",
        "        timezone   => 'America/New_York',",
        "        UTC        => 1,",
        "    },",
    ) if $region;
    push @text, (
        "    postInstallNonRooted => \"$post_install_nr\","
    ) if $post_install_nr;
    push @text, (
        "    postInstall => \"$post_install\","
    ) if $post_install;
    push @text, (
        "    X => { disabled => 1 },",
        "    keep_unrequested_dependencies => 0,",
        "    match_all_hardware => 1,",
        "    curl_options => '--silent',",
        "    autoExitInstall => 1,",
        "};",
    );
    output($file, map { "$_\n" } @text);
}

sub create_initial_symlinks {
    my ($chroot, $rooted_stage2) = @_;

    my $chroot_stage2 = $chroot . $rooted_stage2;

    foreach my $line (cat_or_die($chroot_stage2 . '/usr/share/symlinks')) {
	my ($from, $to_) = split(' ', $line);
	my $to = $chroot . ($to_ || $from);
	$from = $rooted_stage2 . $from if !$to_;
	symlinkf($from, $to) or die "ERROR: symlinking $to failed\n";
    }

    my $from = $rooted_stage2 . '/usr';
    my $to = $chroot . '/usr';
    symlinkf $from, $to or die "ERROR: symlinking $to failed\n";

    foreach my $dir ('/bin', '/sbin', '/lib', '/lib64') {
        $from = 'usr' . $dir;
        $to = $chroot . $dir;
        symlinkf($from, $to) or die "ERROR: symlinking $to failed\n";
    }
}

sub build_local_repo {
    my ($build) = @_;

    my $requested_packages = $build->{system}{local_repo_packages} || [];
    return if !@$requested_packages;

    print "Building local repository\n" if $::verbose > 1;

    my $root = $build->get_live_root;
    my $arch = $build->{settings}{arch};

    # We aren't going to run in the chroot, so we need to adjust the paths
    # in the urpmi configuration.
    my $base_repository = $build->{settings}{repository};
    my $arch_repository = $base_repository . '/' . $arch;
    my $i586_repository = $base_repository . '/' . 'i586';
    run_as_root('sed', '-i', "s!/tmp/image!$arch_repository!", glob($root . '/etc/urpmi/mediacfg.d/*/url'));
    run_as_root('sed', '-i', "s!/tmp/image!$arch_repository!", $root . '/etc/urpmi/urpmi.cfg');
    run_as_root('sed', '-i', "s!/tmp/i586!$i586_repository!",  $root . '/etc/urpmi/urpmi.cfg') if $arch eq 'x86_64';

    # When we pass a chroot directory to urpmi, it wants a /dev/null in
    # that root.
    mk_dev_null($root);

    # Initialise a urpm object to let us query the database.
    my $urpm = urpm->new;

    urpm::set_files($urpm, $root);
    urpm::get_global_options($urpm);

    $urpm->{info} = sub {};
    $urpm->{log}  = sub {};

    urpm::media::configure($urpm, cmdline_skiplist => join(',', @{$build->{system}{exclude_packages} || []}));

    print "..selecting RPMs\n" if $::verbose > 1;

    # For each requested package in turn, find any dependencies that aren't
    # already installed and add them to our hash of selected packages. Do
    # this for each package separately, in case some of the requested packages
    # conflict.
    my $error;
    my %selected;
    foreach my $name (@$requested_packages) {
        my (%requested, %state);
        urpm::select::search_packages($urpm, \%requested, [ $name ], no_substring => 1);
        if (!%requested) {
            print "ERROR: couldn't find '$name' package in selected media\n";
            $error = 1;
            next;
        }
        urpm::select::resolve_dependencies($urpm, \%state, \%requested, auto_select => 1, no_recommends => 1);
        my @unselected = urpm::select::unselected_packages(\%state);
        if (@unselected) {
            print "ERROR: couldn't add '$name' package to local repository\n";
            print urpm::select::translate_why_unselected($urpm, \%state, @unselected);
            $error = 1;
            next;
        }
        $selected{$_} = 1 foreach keys %{$state{selected}};
    }

    print "..copying RPMs\n" if $::verbose > 1;

    # Find the URLs for the selected RPMs and copy them to the appropriate
    # media directory. Note that in the local repository there is only a
    # single medium for each class, so we ignore the source media type.
    # Record the media classes we find so we know what hdlists we need.
    my %classes;
    my @selected_packages = @{$urpm->{depslist}}[keys %selected];
    foreach my $pkg (@selected_packages) {
        my @medium = grep { $pkg->id >= $_->{start} && $pkg->id <= $_->{end} } @{$urpm->{media}};
        my $src_path = $medium[0]->{url} . '/' . $pkg->filename;
        my @path_parts = split('/', $src_path);
        my $class = $path_parts[-3];
        my $dst_dir = $local_repo_dir . $class;
        mkdir_in_root($root, $dst_dir) if ! -d "$root$dst_dir";
        copy_file_to_root($root, $dst_dir, undef, $src_path);
        $classes{$class} = 1;
    }

    print "..generating media info\n" if $::verbose > 1;

    foreach my $class (keys %classes) {
        my $media_info_dir = $local_repo_dir . $class . '/media_info';
        mkdir_in_root($root, $media_info_dir);
        my $pubkey = $arch_repository . '/media/' . $class . '/release/media_info/pubkey';
        copy_file_to_root($root, $media_info_dir, undef, $pubkey);
        run_in_root($root, $arch, 'genhdlist2', if_($::verbose < 2, '-q'), $local_repo_dir . $class)
          or die "ERROR: failed to generate hdlists for '$class' local repository\n";
    }

    $error and die "ERROR: some requested packages have not been added to the local repository\n";
}

###############################################################################
# System Customisation
###############################################################################

# This is the top-level function called to customise the root filesystem. It
# allows the standard Mageia installation to be fine-tuned for use as a Live
# system. The basic root filesystem must have been prepared before calling
# this function.
#
sub customise_live_system {
    my ($build) = @_;

    print "Customising Live system\n" if $::verbose;

    my $arch = $build->{settings}{arch};
    my $root = $build->get_live_root;

    # Workaround buggy installation of directories that are not owned by any
    # packages.
    my $previous_umask = umask;
    umask 022;

    my $error_message;
    try {
        mount_system_fs($root);

        # Copy resolv.conf for name resolution to work when adding media.
        copy_to_root($root, '/etc/', undef, '/etc/resolv.conf');

        # Remove urpmi media added by drakx-in-chroot, they're unusable.
        run_in_root($root, undef, 'urpmi.removemedia', if_($::verbose < 3, '-q'), '-a');

        print "..adding additional media\n" if $::verbose > 1;

        # Add additional media for installing RPMs not in the main repository.
        foreach (@{$build->{system}{additional_media}}) {
            run_in_root($root, undef, 'urpmi.addmedia', if_($::verbose < 2, '-q'),
                        $_->{name}, $_->{path})
              or die "ERROR: unable to add media from $_->{path}\n";

            @{$_->{packages} || []} or next;

            run_in_root($root, $arch, 'urpmi', if_($::verbose < 3, '-q'), '--auto', '--no-verify-rpm',
                        if_($_->{name} ne '--distrib', '--searchmedia', $_->{name}), @{$_->{packages}})
              or die "ERROR: unable to install packages from $_->{path}\n";
        }

        print "..installing additional packages\n" if $::verbose > 1;

        # Additional rpms may have dependencies in additional media.
        if (@{$build->{system}{rpms} || []}) {
            my $rpm_tmp_dir = '/tmp/draklive_rpms/';
            mkdir_in_root($root, $rpm_tmp_dir);

            my @rpm_files = map { $build->get_absolute_path($_) } @{$build->{system}{rpms}};
            copy_to_root($root, $rpm_tmp_dir, undef, @rpm_files);

            @rpm_files = map { $rpm_tmp_dir . basename($_) } @{$build->{system}{rpms}};
            run_in_root($root, $arch, 'urpmi', if_($::verbose < 3, '-q'), '--auto', '--no-verify-rpm', @rpm_files)
              or die "ERROR: unable to install additional system rpms\n";

            rm_in_root($root, $rpm_tmp_dir);
        }

        # Remove any additional media.
        if (@{$build->{system}{additional_media}}) {
            run_in_root($root, undef, 'urpmi.removemedia', if_($::verbose < 3, '-q'), '-a');
        }

        print "..adding local repository media\n" if $::verbose > 1;

        # Add local repository media
        foreach my $path (glob($root . $local_repo_dir . '*')) {
            my $name = basename($path);
            run_in_root($root, undef, 'urpmi.addmedia', if_($::verbose < 3, '-q'),
                        'Live ' . ucfirst($name), $local_repo_dir . $name)
              or die "ERROR: unable to add $name medium from local repository\n";
        }

        print "..removing unwanted packages\n" if $::verbose > 1;

        # Remove any packages as requested by the user.
        my @erase = @{$build->{system}{erase_rpms} || []};
        run_in_root($root, $arch, 'rpm', '-e', @erase) if @erase;

        print "..disabling unwanted services\n" if $::verbose > 1;

        # Disable services as requested by the user.
        foreach (@{$build->{system}{disable_services}}) {
            run_in_root($root, undef, 'systemctl', if_($::verbose < 3, '-q'), 'disable', "$_.service");
        }
        foreach (@{$build->{system}{disable_timers}}) {
            run_in_root($root, undef, 'systemctl', if_($::verbose < 3, '-q'), 'disable', "$_.timer");
        }

        print "..adjusting system files\n" if $::verbose > 1;

        # Make sure harddrake is run:
        #   if previous HW config file is empty, we assume DrakX has just completed the installation
        #   (do it in chroot, or else Storable from the build system may write an incompatible config file)
        run_in_root($root, undef, 'perl', '-MStorable', '-e', qq(Storable::store({ UNKNOWN => {} }, '/etc/sysconfig/harddrake2/previous_hw')));

        # Remove some build-machine specific configuration.
        foreach (qw(/etc/shorewall/interfaces /etc/shorewall6/interfaces /etc/mdadm.conf)) {
            clean_system_conf_file($root . $_);
        }

        # Create fstab.
        my $mount_options = $build->get_media_setting('mount_options') || 'defaults';
        my $fstab_entry;
        if ($build->{mount}{overlay}) {
            $fstab_entry = "none / $build->{mount}{overlay} $mount_options 0 0";
        } else {
            $fstab_entry = $build->get_media_setting('source') . " / " . $build->get_media_setting('fs') . " $mount_options 1 1";
        }
        output_to_root($root, '/etc/fstab', 0644, $fstab_entry);

        # Interactive mode can lead to race in initscripts.
        run_as_root('sed', '-i', 's/^PROMPT=.*/PROMPT=no/', $root . '/etc/sysconfig/init');

        configure_draklive_resize($build);

        print "..copying additional files\n" if $::verbose > 1;

        # Copy extra files as requested by the user.
        foreach (@{$build->{system}{files}}) {
            my ($source, $dest, $o_opts) = @$_;
            mkdir_in_root($root, $dest =~ m|/$| ? $dest : dirname($dest));
            my @sources = glob__($build->get_absolute_path($source));
            my $mode = $o_opts && $o_opts->{mode};
            copy_to_root($root, $dest, $mode, @sources);
        }
        my @no_install_files = map { $_->[1] } grep { $_->[2] && $_->[2]{no_install} } @{$build->{system}{files}};
        my $installer_file = '/etc/draklive-install.d/remove.d/draklive';
        mkdir_in_root($root, dirname($installer_file));
        output_to_root($root, $installer_file, undef, @no_install_files);

        print "..removing unwanted files\n" if $::verbose > 1;

        # Remove any files as requested by the user.
        my @remove = @{$build->{system}{remove_files} || []};
        rm_in_root($root, @remove) if @remove;

        print "..applying patches\n" if $::verbose > 1;

        # Apply patches as requested by the user.
        foreach (@{$build->{system}{patches}}) {
            my $patch_file = $build->get_absolute_path($_);
            my @patch_cmd = ('patch', '-p0', '-d', $root, '-i', $patch_file, if_($::verbose < 3, '-s'));
            run_as_root(join(' ', @patch_cmd, '--dry-run -f -R > /dev/null')) || run_as_root(@patch_cmd)
              or die "ERROR: unable to apply patch $patch_file\n";
        }

        print "..performing final fixes\n" if $::verbose > 1;

        # Perform any final fixes as requested by the user.
        if ($build->{system}{final_fixes}) {
            run_in_root($root, $arch, 'bash', '-c', $build->{system}{final_fixes});
        }

        # Final cleanup.
        clean_system_conf_file($root . '/etc/resolv.conf');

        write_dist_lists($build);
    } catch {
        $error_message = $_;
    } finally {
        umount_all_in_root($root);
        umask $previous_umask;
    };
    defined $error_message && die $error_message;
}

sub configure_draklive_resize {
    my ($build) = @_;

    my $resizable_loopback = find { $_->{min_size} } @{$build->{mount}{dirs} || []};
    if ($resizable_loopback) {
        my $ext = $loop_types{$resizable_loopback->{type}}{extension};
        my @text = (
            "DRAKLIVE_RESIZE=yes",
            "LOOPBACK=/live/media/loopbacks$resizable_loopback->{path}$ext",
            "TYPE=$resizable_loopback->{fs}",
            "MIN_SIZE=$resizable_loopback->{min_size}",
            "MOUNT=/live$resizable_loopback->{mountpoint}_resized",
            "OLD_MOUNT=/live$resizable_loopback->{mountpoint}",
            "UNION=/",
        );
        output_to_root($build->get_live_root, '/etc/sysconfig/draklive-resize', undef, @text);
    }
}

sub clean_system_conf_file {
    my ($file) = @_;

    run_as_root('sed', '-i', '/^[^#]/d', $file) if run_as_root('test', '-e', $file);
}

sub write_dist_lists {
    my ($build) = @_;

    my $lists_dir = $build->get_build_dir('dist');
    mkdir_p($lists_dir);

    my $root = $build->get_live_root;

    run_in_root($root, undef, "rpm -qa | sort > " .
        $lists_dir . '/' . $build->get_name . '.lst');

    run_in_root($root, undef, "rpm -qa --qf '%{name}\n' | sort > " .
        $lists_dir . '/' . $build->get_name . '.lst.names');

    run_in_root($root, undef, qq( sh -c "rpm -qa --qf '[%{NAME} %{FILESIZES} %{FILESTATES}\n]' | awk '{if(\\\$3==0) {s[\\\$1]+=\\\$2}} END{for (p in s){print s[p],p}}' | sort -n" > ) .
        $lists_dir . '/' . $build->get_name . '.lst.full');

    run_in_root($root, undef, qq( sh -c "urpmi_rpm-find-leaves | xargs rpm -q --qf '[%{NAME} %{FILESIZES} %{FILESTATES}\n]' | awk '{if(\\\$3==0) {s[\\\$1]+=\\\$2}} END{for (p in s){print s[p],p}}' | sort -n" > ) .
        $lists_dir . '/' . $build->get_name . '.lst.leaves');

    require lang;
    my @live_langs = $build->get_langs;
    my @langs = grep { member($_, @live_langs) || member(lang::locale_to_main_locale($_), @live_langs) } lang::list_langs();
    my $langs_file = $lists_dir . '/' . $build->get_name . '.langs';
    output_p($langs_file, map { lang::l2name($_) . " (" . $_ . ")\n" } sort(@langs));
}

###############################################################################
# Helper Functions
###############################################################################

sub mkdir_in_root {
    my ($root, $dir) = @_;

    run_as_root('mkdir', '-p', $root . $dir)
      or die "ERROR: failed to make directory $dir in Live system root\n";
}

sub copy_file_to_root {
    my ($root, $dst_dir, $mode, $src_file) = @_;

    my $dst_file = $dst_dir . '/' . basename($src_file);
    if ($src_file =~ m!^(ftp|http)://!) {
        run_as_root('curl', '--silent', '-o', $root . $dst_file, $src_file)
          or die "ERROR: couldn't copy $src_file to $dst_file\n";
    } else {
        run_as_root('cp', $src_file, $root . $dst_file)
          or die "ERROR: couldn't copy $src_file to $dst_file\n";
    }

    return if !defined $mode;

    run_as_root('chmod', sprintf("%o", $mode), $root . $dst_file)
      or die "ERROR: failed to change mode of $dst_file in Live system root\n";
}

sub copy_to_root {
    my ($root, $dest, $mode, @files) = @_;

    run_as_root('cp', '-af', '--no-preserve=ownership', @files, $root . $dest)
      or die "ERROR: failed to copy file to $dest in Live system root\n";

    return if !defined $mode;

    run_as_root('chmod', sprintf("%o", $mode), $root . $dest)
      or die "ERROR: failed to change mode of $dest in Live system root\n";
}

sub output_to_root {
    my ($root, $file, $mode, @text) = @_;

    my $temp_file = tmpnam();
    output($temp_file, map { "$_\n" } @text);
    copy_to_root($root, $file, $mode, $temp_file);
    unlink($temp_file);
}

sub rm_in_root {
    my ($root, @targets) = @_;

    run_as_root('rm', '-rf', map { $root . $_ } @targets)
      or die "ERROR: failed to remove files in Live system root\n";
}

1;