package MDV::Draklive::Initrd;

use MDK::Common;
use common;
use list_modules;
use MDV::Draklive::Utils;
use MDV::Draklive::StorageFS;
use MDV::Draklive::Loopback;
use MDV::Draklive::Overlay;

sub nls_modules {
    my ($live) = @_;
    my $fs = $live->{media}->get_media_setting('fs');
    if_($fs eq 'vfat', 'nls_cp437'), #- default FAT codepage
    if_($fs !~ /^ext/, map { "nls_$_" } (map { "iso8859_$_" } 1..7, 9, 13..15), 'utf8');
}

sub create_media_initrd {
    my ($live) = @_;
    create_initrd_for_media($live, $live->{media});
    cp_f($live->get_builddir . $live->{prefix}{build}{boot} . $live->{media}->get_initrd_path,
         $live->{copy_initrd}) if $live->{copy_initrd};
}

sub inst_initrd_file {
    my ($root, $initrd_tree, $file) = @_;
    if ($file =~ m|/s?bin/|) {
        inst_initrd_bin($root, $initrd_tree, $file);
    } else {
        mkdir_p($initrd_tree . dirname($file));
        inst_initrd_dso_deps($root, $initrd_tree, $file) if $file =~ m|/lib[^/]*/|;
        cp_f($root . $file, $initrd_tree . $file) or die "unable to copy $file from system chroot\n";
    }
}

sub inst_initrd_dso_deps {
    my ($root, $initrd_tree, $dso) = @_;
    foreach my $file (`chroot $root ldd $dso | awk '/\\// {if(\$2 == "=>") {print \$3} else {print \$1}}'`) {
        chomp $file;
        $file =~ s!^(/lib[^/]*)/(?:i686|tls)!$1!;
        my ($lib_prefix, $filename) = $file =~ m|(/lib[^/]*).*/([^/]+)$| or next;
        my $dest = $initrd_tree . $lib_prefix . '/' . $filename;
        mkdir_p($initrd_tree . $lib_prefix);
        -f $dest || cp_f($root . $file, $dest) or die "unable to copy $filename from system chroot\n";
    }
}
sub inst_initrd_bin {
    my ($root, $initrd_tree, $bin) = @_;
    cp_f($root . $bin, $initrd_tree . '/bin/');
    inst_initrd_dso_deps($root, $initrd_tree, $bin);
}

sub create_initrd_for_media {
    my ($live, $media) = @_;
    my $initrd = $live->get_builddir . $live->{prefix}{build}{boot} . $media->get_initrd_path;
    create_media_specific_initrd($live, $media, $live->get_system_root, $live->find_kernel, $initrd);
}

sub create_media_specific_initrd {
    my ($live, $media, $root, $initrd, $kernel) = @_;

    my $lib_prefix = find { glob($root . $_ . '/libc.so.*') } qw(/lib64 /lib);
    $lib_prefix or die 'unable to find system libraries in /lib or /lib64';

    my $initrd_tree = $live->get_builddir . $live->{prefix}{build}{initrd} . '/' . $media->{storage};
    rm_rf($initrd_tree) if -e $initrd_tree;

    mkdir_p($initrd_tree . $_) foreach
      qw(/bin /dev /proc /sys /tmp),
      map { $live->{prefix}{live}{mnt} . $_ }
        $live->{prefix}{media}{mnt},
        $live->{mount}{root},
        map { $_->{mountpoint} } @{$live->{mount}{dirs} || []};

    #- use nash with label support
    inst_initrd_bin($root, $initrd_tree, '/sbin/nash');
    inst_initrd_bin($root, $initrd_tree, '/usr' . $lib_prefix . '/drakx-installer-binaries/probe-modules');
    inst_initrd_bin($root, $initrd_tree, '/sbin/blockdev')
      if $media->get_media_setting('rereadpt');
    inst_initrd_bin($root, $initrd_tree, '/usr/bin/strace')
      if $live->{debug};

    foreach (chomp_(run_program::rooted_get_stdout($root, "/usr/sbin/splashy_find_files"))) {
        inst_initrd_file($root, $initrd_tree, $_);
    }

    #- busybox is required to:
    #-   detect usb-storage process (we need sh/while/ps/grep)
    #-   mount loopbacks read-only with losetup (useful over NFS)
    my $busybox = '/usr/bin/busybox';
    inst_initrd_bin($root, $initrd_tree, $busybox);
    my $busybox_rooted = $root . $busybox;
    my @l = map { /functions:/ .. /^$/ ? do { s/\s//g; split /,/ } : () } `$busybox_rooted`;
    shift @l;
    symlink('busybox', $initrd_tree . "/bin/$_") foreach @l;

    my $fs = $media->get_media_setting('fs');
    my @used_loop_types = uniq(map { $_->{type} } @{$live->{mount}{dirs}});
    inst_initrd_bin($root, $initrd_tree, $_) foreach
      MDV::Draklive::StorageFS::get_files($fs),
      (map { @{$loop_types{$_} && $loop_types{$_}{files} || []} } @used_loop_types);

    output_p($initrd_tree . '/etc/fstab', '');
    output_p($initrd_tree . '/etc/mtab', '');

    my $loop_nb = 254;
    my $rrpt_dev = $media->get_media_setting('rereadpt');
    require devices;
    devices::make($initrd_tree . "/dev/$_") foreach
        if_($rrpt_dev, $rrpt_dev),
        qw(console initrd null ram systty),
        (map { "tty$_" } 0..8),
        (map { "loop$_" } 0 .. $loop_nb);
    syscall_('mknod', $initrd_tree . "/dev/fb0", c::S_IFCHR(), makedev(29, 0)) or die "mknod failed (dev $_): $!";
    #- pre-create devfsd compatibility loop devices (since busybox is still built with devfsd support)
    mkdir_p($initrd_tree . "/dev/loop");
    cp_af($initrd_tree . "/dev/loop$_", $initrd_tree . "/dev/loop/$_") foreach 0 .. $loop_nb;

    print "using kernel $kernel\n";
    my $kernel_root = "/lib/modules/" . $kernel;
    list_modules::load_dependencies($root . $kernel_root . "/modules.dep");

    my ($storage_modules, $skipped) = partition { list_modules::modname2filename($_) }
      uniq(map { modules::cond_mapping_24_26($_) } category2modules($media->get_media_setting('modules')));
    my ($extra_modules, $extra_missing) = partition { list_modules::modname2filename($_) }
      category2modules($media->get_media_setting('media_modules')),
      nls_modules($live),
      $media->get_media_fs_module,
      @{$media->get_media_setting('extra_modules') || []},
      (map { @{$loop_types{$_}{modules} || []} } uniq(map { $_->{type} } @{$live->{mount}{dirs} || []})),
      ($live->{mount}{overlay} ? @{$MDV::Draklive::Overlay::overlay{$live->{mount}{overlay}}{modules} || []} : ());

    my @additional_modules = map { if_(m!([^/]+)\.ko(?:\.gz)?!, list_modules::filename2modname($1)) } @{$live->{system}{additional_modules}};
    @$extra_modules = difference2($extra_modules, \@additional_modules);
    if (@{$live->{system}{exclude_modules} || []}) {
        print STDERR "excluding modules: " . join(' ', @{$live->{system}{exclude_modules}}) . "\n";
        @$_ = difference2($_, $live->{system}{exclude_modules}) foreach $storage_modules, $extra_modules;
    }

    my @missing = sort(difference2($extra_missing, \@additional_modules));
    @missing and die "missing mandatory modules:\n" . join("\n", @missing, '');

    mkdir_p($initrd_tree . $kernel_root . "/kernel");
    my @modules = (@$storage_modules, @$extra_modules);
    my @modules_closure = uniq(map { list_modules::dependencies_closure($_) } @modules);
    foreach my $m (@modules_closure) {
        my $full = list_modules::modname2path($m);
        mkdir_p(dirname($initrd_tree . $full));
        cp_f($root . $full, $initrd_tree . $full);
    }
    foreach my $f (@{$live->{system}{additional_modules}}) {
        my $destdir = $initrd_tree . $kernel_root . "/kernel";
        if ($f =~ /.gz$/) {
            cp_f($live->{settings}{config_root} . '/' . $f, $destdir);
        } else {
            my $m = basename($f);
            run_program::run('gzip', '>', "$destdir/$m.gz", '-c', $live->{settings}{config_root} . '/' . $f);
        }
    }
    run_('depmod', '-b', $initrd_tree, $kernel);

    mkdir_p($initrd_tree . "/etc/blkid"); #- for nash and showlabels cache
    mkdir_p($initrd_tree . "/lib/module-init-tools");
    cp_f($root . "/lib/module-init-tools/ldetect-lst-modules.alias", $initrd_tree . "/lib/module-init-tools");
    mkdir_p($initrd_tree . "/usr/share/ldetect-lst");
    cp_f($root . "/usr/share/pci.ids", $initrd_tree . "/usr/share");
    cp_f($root . "/usr/share/ldetect-lst/" . $_, $initrd_tree . "/usr/share/ldetect-lst")
      foreach qw(fallback-modules.alias pcitable.gz usbtable.gz);

    @$skipped and print STDERR "skipped modules: " . join(' ', sort(@$skipped)) . "\n";

    my @extra_modules_closure = map { list_modules::modname2filename($_) }
      uniq(map { list_modules::dependencies_closure($_) }  @$extra_modules);
    create_initrd_scriptlet($live, $media, @extra_modules_closure, @additional_modules);

    compress_initrd_tree($live, $initrd_tree, $initrd);
    add_splash($live, $initrd);
}

sub create_initrd_scriptlet {
    my ($live, $media, @modules) = @_;
    my $target = $live->{prefix}{live}{mnt} . ($live->{mount}{root} || $live->{prefix}{media}{mnt});
    my $pre = $media->get_media_setting('pre');
    my $fs = $media->get_media_setting('fs');
    my $rrpt_dev = $media->get_media_setting('rereadpt');
    my $debug_shell = "sh -c 'if grep -q initrd_debug /proc/cmdline; then exec sh </dev/console >/dev/console 2>/dev/console; fi'";
    my ($mount_first, $mount_last) = partition { !$loop_types{$_->{type}}{delay_mount} }
      grep { exists $loop_types{$_->{type}}{mount} } @{$live->{mount}{dirs} || []};

    output_with_perm($live->get_builddir . $live->{prefix}{build}{initrd} . '/' . $media->{storage} . '/linuxrc', 0755,
                     join("\n",
                          "#!/bin/nash",
                          #- required for labels and ps
                          "nash-mount -t proc /proc /proc",
                          #- required for cdrom labels
                          "nash-mount -t sysfs /sys /sys",
                          "splashy_chvt 8",
                          "splashy boot",
                          (map { join(" ", "probe-modules", list_modules::filename2modname($_), grep { $_ } $live->{system}{module_options}{$_}) } @modules),
                          "probe-modules --$media->{storage}",
                          if_($rrpt_dev,
                              "echo *** Waiting for new partitions on device ${rrpt_dev} ***",
                              "sh -c 'while ! ls /sys/block/${rrpt_dev}/${rrpt_dev}* >/dev/null 2>&1; do sleep 3; blockdev --rereadpt /dev/${rrpt_dev} >/dev/null 2>&1; done'"),
                          $debug_shell,
                          if_($pre, deref_array($pre)),
                          "mkdevices /dev",
                          "showlabels --removable",
                          MDV::Draklive::StorageFS::get_mount($fs)->($live, $media),
                          (map { $loop_types{$_->{type}}{mount}->($live, $_) } @$mount_first, @$mount_last),
                          ($live->{mount}{overlay} ? $MDV::Draklive::Overlay::overlay{$live->{mount}{overlay}}{mount}->($live) : ()),
                          if_($live->{system}{initrd_pre_pivot}, deref_array($live->{system}{initrd_pre_pivot})),
                          qq(splashy_update "chroot $target"),
                          "echo 0x0100 > /proc/sys/kernel/real-root-dev",
                          "umount /sys",
                          "sh -c 'umount /proc/bus/usb 2>/dev/null'",
                          "umount /proc",
                          "pivot_root $target $target/initrd",
                          q(sh -c 'rmdir /initrd/live/union'),
                          q(sh -c 'if [ -d /initrd/live/modules ]; then cd /initrd/live/modules; for i in `ls -1`; do mkdir -p /live/modules/$i; mount -n --move $i /live/modules/$i; rmdir $i; done; rmdir /initrd/live/modules; fi'),
                          q(sh -c 'cd /initrd/live; for i in `ls -1`; do [ -d $i ] || continue; mkdir -p /live/$i; mount -n --move $i /live/$i; rmdir $i; done'),
                          q(sh -c 'mv /initrd/live/* /live/'),
                          q(rmdir /initrd/live),
                          if_($live->{system}{initrd_post}, deref_array($live->{system}{initrd_post})),
                          ""));
}

sub compress_initrd_tree {
    my ($live, $initrd_tree, $initrd) = @_;

    my $size = chomp_(run_program::get_stdout("du -ks $initrd_tree | awk '{print \$1}'"));
    my $inodes = chomp_(run_program::get_stdout("find $initrd_tree | wc -l")) + 100;
    my $initrd_size = $size + 350 + int($inodes / 10); #- 10 inodes needs 1K
    $initrd_size += 600; # splashy

    $initrd =~ s/.gz$//;

    mkdir_p(dirname($initrd));
    run_('dd', 'if=/dev/zero', "of=$initrd", 'bs=1k', "count=$initrd_size");
    run_('mke2fs', '-q', '-m', 0, '-F', '-N', $inodes, '-s', 1, $initrd);
    mkdir_p($live->{mnt});
    run_('mount', '-o', 'loop', '-t', 'ext2', $initrd, $live->{mnt});
    cp_af(glob("$initrd_tree/*"), $live->{mnt});
    rm_rf($live->{mnt} . "/lost+found");
    my $left = chomp_(run_program::get_stdout("df -Pk $live->{mnt} | tail -n 1 | awk '{ print \$4 }'"));
    run_('umount', $live->{mnt});
    $left < 200 and die "not enough room to create initrd (only ${left}K left)\n";
    run_('gzip', '-f', '-9', $initrd);
}

sub add_splash {
    my ($live, $initrd) = @_;
    if ($live->{system}{vga_mode} && $live->{system}{splash} ne 'no') {
	require bootloader;
	my $tmp_initrd = '/tmp/initrd.gz';
        cp_f($initrd, $live->get_system_root . $tmp_initrd);
        {
            local $::prefix = $live->get_system_root;
            bootloader::add_boot_splash($tmp_initrd, $live->{system}{vga_mode});
        }
        cp_f($live->get_system_root . $tmp_initrd, $initrd);
        unlink($live->get_system_root . $tmp_initrd);
    }
}

sub create_classical_initrd {
    my ($live) = @_;
    my $kernel = $live->find_kernel;
    #- FIXME: use bootloader-config and allow it not to require a bootloader?
    print "using kernel $kernel\n";
    my $initrd_long = '/boot/initrd-'. $kernel . '.img';
    my $initrd_short = '/boot/initrd.img';
    my $vmlinuz_long = '/boot/vmlinuz-' . $kernel;
    my $vmlinuz_short = '/boot/vmlinuz';
    my $root = $live->get_system_root;
    run_({ root => $root }, 'mkinitrd', '-v', '-f', $initrd_long, $kernel);
    symlinkf(basename($initrd_long), $root . $initrd_short);
    symlinkf(basename($vmlinuz_long), $root . $vmlinuz_short);
    if ($live->{system}{vga_mode} && $live->{system}{splash} ne 'no') {
        require bootloader;
        local $::prefix = $live->get_system_root;
        bootloader::add_boot_splash($initrd_long, $live->{system}{vga_mode});
    }
}

1;