perl-install/fsedit.pm


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635

package fsedit; # $Id$

use diagnostics;
use strict;
use vars qw(%suggestions);

#-######################################################################################
#- misc imports
#-######################################################################################
use common;
use partition_table;
use partition_table::raw;
use fs::type;
use detect_devices;
use devices;
use loopback;
use log;
use fs;

%suggestions = (
  N_("simple") => [
    { mntpoint => "/",     size => 300 << 11, fs_type => 'ext3', ratio => 5, maxsize => 6000 << 11 },
    { mntpoint => "swap",  size =>  64 << 11, fs_type => 'swap', ratio => 1, maxsize => 1100 << 11 },
    { mntpoint => "/home", size => 300 << 11, fs_type => 'ext3', ratio => 3 },
  ], N_("with /usr") => [
    { mntpoint => "/",     size => 250 << 11, fs_type => 'ext3', ratio => 1, maxsize => 2000 << 11 },
    { mntpoint => "swap",  size =>  64 << 11, fs_type => 'swap', ratio => 1, maxsize => 1100 << 11 },
    { mntpoint => "/usr",  size => 300 << 11, fs_type => 'ext3', ratio => 4, maxsize => 4000 << 11 },
    { mntpoint => "/home", size => 100 << 11, fs_type => 'ext3', ratio => 3 },
  ], N_("server") => [
    { mntpoint => "/",     size => 150 << 11, fs_type => 'ext3', ratio => 1, maxsize =>  800 << 11 },
    { mntpoint => "swap",  size =>  64 << 11, fs_type => 'swap', ratio => 2, maxsize => 1600 << 11 },
    { mntpoint => "/usr",  size => 300 << 11, fs_type => 'ext3', ratio => 4, maxsize => 4000 << 11 },
    { mntpoint => "/var",  size => 200 << 11, fs_type => 'ext3', ratio => 3 },
    { mntpoint => "/home", size => 150 << 11, fs_type => 'ext3', ratio => 3 },
    { mntpoint => "/tmp",  size => 150 << 11, fs_type => 'ext3', ratio => 2, maxsize => 1000 << 11 },
  ],
);
foreach (values %suggestions) {
    if (arch() =~ /ia64/) {
	@$_ = ({ mntpoint => "/boot/efi", size => 50 << 11, pt_type => 0xef, ratio => 1, maxsize => 150 << 11 }, @$_);
    }
}

my @suggestions_mntpoints = (
    "/var/ftp", "/var/www", "/boot",
    arch() =~ /sparc/ ? "/mnt/sunos" : arch() =~ /ppc/ ? "/mnt/macos" : "/mnt/windows",
    #- RedHat also has /usr/local and /opt
);

#-######################################################################################
#- Functions
#-######################################################################################
sub recompute_loopbacks {
    my ($all_hds) = @_;
    my @fstab = fs::get::fstab($all_hds);
    @{$all_hds->{loopbacks}} = map { isPartOfLoopback($_) ? @{$_->{loopback}} : () } @fstab;
}

sub raids {
    my ($hds) = @_;

    my @parts = fs::get::hds_fstab(@$hds);

    my @l = grep { isRawRAID($_) } @parts or return [];

    log::l("looking for raids in " . join(' ', map { $_->{device} } @l));
    
    require raid;
    raid::detect_during_install(@l) if $::isInstall;
    raid::get_existing(@l);
}

sub lvms {
    my ($all_hds) = @_;
    my @pvs = grep { isRawLVM($_) } fs::get::fstab($all_hds) or return;

    log::l("looking for vgs in " . join(' ', map { $_->{device} } @pvs));

    #- otherwise vgscan will not find them
    devices::make($_->{device}) foreach @pvs; 
    require lvm;

    my @lvms;
    foreach (@pvs) {
	my $name = lvm::get_vg($_) or next;
	my $lvm = find { $_->{VG_name} eq $name } @lvms;
	if (!$lvm) {
	    $lvm = new lvm($name);
	    lvm::update_size($lvm);
	    lvm::get_lvs($lvm);
	    push @lvms, $lvm;
	}
	$_->{lvm} = $name;
	push @{$lvm->{disks}}, $_;
    }
    @lvms;
}

sub get_hds {
    my ($o_flags, $o_in) = @_;
    my $flags = $o_flags || {};
    $flags->{readonly} && ($flags->{clearall} || $flags->{clear}) and die "conflicting flags readonly and clear/clearall";

    my @drives = detect_devices::hds();

    foreach my $hd (@drives) {
	$hd->{file} = devices::make($hd->{device});
	$hd->{prefix} ||= $hd->{device};
    }

    @drives = partition_table::raw::get_geometries(@drives);

    my (@hds, @raw_hds);
    foreach my $hd (@drives) {
	$hd->{readonly} = $flags->{readonly};

	eval { partition_table::raw::test_for_bad_drives($hd) if !$flags->{no_bad_drives} };
	if (my $err = $@) {
	    if ($err =~ /write error:/) { 
		$hd->{readonly} = 1;
	    } elsif ($err =~ /read error:/) {
		next;
	    } else {
		$o_in and $o_in->ask_warn('', $err);
		next;
	    }
	}

	if ($flags->{clearall} || member($hd->{device}, @{$flags->{clear} || []})) {
	    partition_table::raw::zero_MBR_and_dirty($hd);
	} else {
	    my $handle_die_and_cdie = sub {
		if ($hd->{readonly}) {
		    log::l("using /proc/partitions since diskdrake failed :(");
		    use_proc_partitions($hd);
		    1;
		} elsif (my $type = fs::type::type_subpart_from_magic($hd)) {
		    #- non partitioned drive?
		    if (exists $hd->{usb_description} && $type->{fs_type}) {
			#- USB keys
			put_in_hash($hd, $type);
			push @raw_hds, $hd;
			$hd = '';
			1;
		    } elsif ($type->{pt_type} == 0x8e) {
			#- LVM on full disk
			my $part = { size => $hd->{totalsectors}, device => $hd->{device}, %$type };
			bless $hd, 'partition_table::raw';
			$hd->{readonly} = $hd->{getting_rid_of_readonly_allowed} = 1;
			$hd->{primary}{normal} = [ $part ];
			1;
		    } else {
			0;
		    }
		} else {
		    0;
		}
	    };
	    my $handled;
	    eval {
		catch_cdie {
		    partition_table::read($hd); 
		    compare_with_proc_partitions($hd) if $::isInstall;
		} sub {
		    my $err = $@;
		    if ($handle_die_and_cdie->()) {
			$handled = 1;
			0; #- do not continue, transform cdie into die
		    } else {
			!$o_in || $o_in->ask_okcancel('', formatError($err));
		    }
		};
	    };
	    if (my $err = $@) {
		if ($handled) {
		    #- already handled in cdie handler above
		} elsif ($handle_die_and_cdie->()) {
		} elsif ($o_in && $o_in->ask_yesorno(N("Error"), 
N("I can not read the partition table of device %s, it's too corrupted for me :(
I can try to go on, erasing over bad partitions (ALL DATA will be lost!).
The other solution is to not allow DrakX to modify the partition table.
(the error is %s)

Do you agree to lose all the partitions?
", $hd->{device}, formatError($err)))) {
		    partition_table::raw::zero_MBR($hd);
		} else {
		    #- using it readonly
		    log::l("using /proc/partitions since diskdrake failed :(");
		    use_proc_partitions($hd);
		}
	    }
	    $hd or next;

	    member($_->{device}, @{$flags->{clear} || []}) and partition_table::remove($hd, $_)
	      foreach partition_table::get_normal_parts($hd);
	}

	my @parts = partition_table::get_normal_parts($hd);

	# checking the magic of the filesystem, do not rely on pt_type
	foreach (grep { member($_->{fs_type}, 'vfat', 'ntfs', 'ext2') || $_->{pt_type} == 0x100 } @parts) {
	    if (my $type = fs::type::type_subpart_from_magic($_)) {
                if ($type->{fs_type}) {
                    #- keep {pt_type}
		    $_->{fs_type} = $type->{fs_type};
                } else {
                    put_in_hash($_, $type); 
                }
	    } else {
		$_->{bad_fs_type_magic} = 1;
	    }
	}
	
	foreach (@parts) {
	    my $label =
	      member($_->{fs_type}, qw(ext2 ext3)) ?
		c::get_ext2_label(devices::make($_->{device})) :
		'';
	    $_->{device_LABEL} = $label if $label;
	}

	if ($hd->{usb_media_type}) {
	    $_->{is_removable} = 1 foreach @parts;
	}

	push @hds, $hd;
    }

    #- detect raids before LVM allowing LVM on raid
    my $raids = raids(\@hds);
    my $all_hds = { %{ fs::get::empty_all_hds() }, hds => \@hds, raw_hds => \@raw_hds, lvms => [], raids => $raids };

    $all_hds->{lvms} = [ lvms($all_hds) ];

    fs::get_major_minor(fs::get::fstab($all_hds));

    $all_hds;
}

sub read_proc_partitions {
    my ($hds) = @_;

    my @all = devices::read_proc_partitions_raw();
    my ($parts, $disks) = partition { $_->{dev} =~ /\d$/ && $_->{dev} !~ /^(sr|scd)/ } @all;

    my $devfs_like = any { $_->{dev} =~ m|/disc$| } @$disks;

    my %devfs2normal = map {
	my (undef, $major, $minor) = devices::entry($_->{device});
	my $disk = find { $_->{major} == $major && $_->{minor} == $minor } @$disks;
	$disk->{dev} => $_->{device};
    } @$hds;

    my $prev_part;
    foreach my $part (@$parts) {
	my $dev;
	if ($devfs_like) {
	    $dev = -e "/dev/$part->{dev}" ? $part->{dev} : sprintf("0x%x%02x", $part->{major}, $part->{minor});
	    $part->{rootDevice} = $devfs2normal{dirname($part->{dev}) . '/disc'};
	} else {
	    $dev = $part->{dev};
	    if (my $hd = find { $part->{dev} =~ /^\Q$_->{device}\E./ } @$hds) {
		put_in_hash($part, partition_table::hd2minimal_part($hd));
	    }
	}
	undef $prev_part if $prev_part && ($prev_part->{rootDevice} || '') ne ($part->{rootDevice} || '');

	$part->{device} = $dev;
	$part->{size} *= 2;	# from KB to sectors
	$part->{start} = $prev_part ? $prev_part->{start} + $prev_part->{size} : 0;
	put_in_hash($part, fs::type::type_subpart_from_magic($part));
	$prev_part = $part;
	delete $part->{dev}; # cleanup
    }
    @$parts;
}

sub is_same_hd {
    my ($hd1, $hd2) = @_;
    if ($hd1->{major} && $hd2->{major}) {
	$hd1->{major} == $hd2->{major} && $hd1->{minor} == $hd2->{minor};
    } elsif (my ($s1) = $hd1->{device} =~ m|https?://(.+?)/*$|) {
	my ($s2) = $hd2->{device} =~ m|https?://(.+?)/*$|;
	$s1 eq $s2;
    } else {
	$hd1->{devfs_device} && $hd2->{devfs_device} && $hd1->{devfs_device} eq $hd2->{devfs_device}
	  || $hd1->{device_LABEL} && $hd2->{device_LABEL} && $hd1->{device_LABEL} eq $hd2->{device_LABEL}
	  || $hd1->{device} && $hd2->{device} && $hd1->{device} eq $hd2->{device};
    }
}

#- are_same_partitions() do not look at the device name since things may have changed
sub are_same_partitions {
    my ($part1, $part2) = @_;
    foreach ('start', 'size', 'pt_type', 'fs_type', 'rootDevice') {
	$part1->{$_} eq $part2->{$_} or return 0;
    }
    1;
}

sub is_one_big_fat_or_NT {
    my ($hds) = @_;
    @$hds == 1 or return 0;

    my @l = fs::get::hds_fstab(@$hds);
    @l == 1 && isFat_or_NTFS($l[0]) && fs::get::hds_free_space(@$hds) < 10 << 11;
}


sub computeSize {
    my ($part, $best, $all_hds, $suggestions) = @_;
    my $max = $part->{maxsize} || $part->{size};
    return min($max, $best->{size}) unless $best->{ratio};

    my $free_space = fs::get::free_space($all_hds);
    my @l = my @L = grep { 
	if ($free_space >= $_->{size}) {
	    $free_space -= $_->{size};
	    1;
	} else { 0 } } @$suggestions;

    my $cylinder_size_maxsize_adjusted;
    my $tot_ratios = 0;
    while (1) {
	my $old_free_space = $free_space;
	my $old_tot_ratios = $tot_ratios;

	$tot_ratios = sum(map { $_->{ratio} } @l);
	last if $tot_ratios == $old_tot_ratios;

	@l = grep { 
	    if ($_->{ratio} && $_->{maxsize} && $tot_ratios &&
		$_->{size} + $_->{ratio} / $tot_ratios * $old_free_space >= $_->{maxsize}) {
		return min($max, $best->{maxsize}) if $best->{mntpoint} eq $_->{mntpoint};
		$free_space -= $_->{maxsize} - $_->{size};
		if (!$cylinder_size_maxsize_adjusted++) {
		    eval { $free_space += fs::get::part2hd($part, $all_hds)->cylinder_size - 1 };
		}
		0;
	    } else {
		$_->{ratio};
	    } 
	} @l;
    }
    my $size = int min($max, $best->{size} + $free_space * ($tot_ratios && $best->{ratio} / $tot_ratios));
    #- verify other entry can fill the hole
    (any { $_->{size} < $max - $size } @L) ? $size : $max;
}

sub suggest_part {
    my ($part, $all_hds, $o_suggestions) = @_;
    my $suggestions = $o_suggestions || $suggestions{server} || $suggestions{simple};

    #- suggestions now use {fs_type}, but still keep compatibility
    foreach (@$suggestions) {
	fs::type::set_pt_type($_, $_->{pt_type}) if !exists $_->{fs_type};
    }

    my $has_swap = any { isSwap($_) } fs::get::fstab($all_hds);

    my @local_suggestions =
      grep { !fs::get::has_mntpoint($_->{mntpoint}, $all_hds) || isSwap($_) && !$has_swap }
      grep { !$_->{hd} || $_->{hd} eq $part->{rootDevice} }
	@$suggestions;

    my ($best) =
      grep { !$_->{maxsize} || $part->{size} <= $_->{maxsize} }
      grep { $_->{size} <= ($part->{maxsize} || $part->{size}) }
      grep { !$part->{fs_type} || $part->{fs_type} eq $_->{fs_type} || isTrueFS($part) && isTrueFS($_) }
	@local_suggestions;

    defined $best or return 0; #- sorry no suggestion :(

    $part->{mntpoint} = $best->{mntpoint};
    fs::type::set_type_subpart($part, $best) if !isTrueFS($best) || !isTrueFS($part);
    $part->{size} = computeSize($part, $best, $all_hds, \@local_suggestions);
    foreach ('options', 'lv_name', 'encrypt_key') {
	$part->{$_} = $best->{$_} if $best->{$_};
    }
    1;
}

sub suggestions_mntpoint {
    my ($all_hds) = @_;
    sort grep { !/swap/ && !fs::get::has_mntpoint($_, $all_hds) }
      (@suggestions_mntpoints, map { $_->{mntpoint} } @{$suggestions{server} || $suggestions{simple}});
}

#- you can do this before modifying $part->{mntpoint}
#- so $part->{mntpoint} should not be used here, use $mntpoint instead
sub check_mntpoint {
    my ($mntpoint, $hd, $part, $all_hds) = @_;

    $mntpoint eq '' || isSwap($part) || isNonMountable($part) and return 0;
    $mntpoint =~ m|^/| or die N("Mount points must begin with a leading /");
    $mntpoint =~ m|[\x7f-\xff]| and cdie N("Mount points should contain only alphanumerical characters");
    fs::get::mntpoint2part($mntpoint, [ grep { $_ ne $part } fs::get::really_all_fstab($all_hds) ]) and die N("There is already a partition with mount point %s\n", $mntpoint);

    cdie N("You've selected a software RAID partition as root (/).
No bootloader is able to handle this without a /boot partition.
Please be sure to add a /boot partition") if $mntpoint eq "/" && isRAID($part) && !fs::get::has_mntpoint("/boot", $all_hds);
    die N("You can not use a LVM Logical Volume for mount point %s", $mntpoint)
      if $mntpoint eq '/boot' && isLVM($hd);
    cdie N("You've selected a LVM Logical Volume as root (/).
The bootloader is not able to handle this without a /boot partition.
Please be sure to add a /boot partition") if $mntpoint eq "/" && isLVM($part) && !fs::get::has_mntpoint("/boot", $all_hds);
    cdie N("You may not be able to install lilo (since lilo does not handle a LV on multiple PVs)")
      if 0; # arch() =~ /i.86/ && $mntpoint eq '/' && isLVM($hd) && @{$hd->{disks} || []} > 1;

    cdie N("This directory should remain within the root filesystem")
      if member($mntpoint, qw(/root));
    die N("This directory should remain within the root filesystem")
      if member($mntpoint, qw(/bin /dev /etc /lib /sbin /mnt));
    die N("You need a true filesystem (ext2/ext3, reiserfs, xfs, or jfs) for this mount point\n")
      if !isTrueLocalFS($part) && $mntpoint eq '/';
    die N("You need a true filesystem (ext2/ext3, reiserfs, xfs, or jfs) for this mount point\n")
      if !isTrueFS($part) && member($mntpoint, qw(/home /tmp /usr /var));
    die N("You can not use an encrypted file system for mount point %s", $mntpoint)
      if $part->{options} =~ /encrypted/ && member($mntpoint, qw(/ /usr /var /boot));

    local $part->{mntpoint} = $mntpoint;
    loopback::check_circular_mounts($hd, $part, $all_hds);
}

sub add {
    my ($hd, $part, $all_hds, $options) = @_;

    isSwap($part) ?
      ($part->{mntpoint} = 'swap') :
      $options->{force} || check_mntpoint($part->{mntpoint}, $hd, $part, $all_hds);

    delete $part->{maxsize};

    if (isLVM($hd)) {
	lvm::lv_create($hd, $part);
    } else {
	partition_table::add($hd, $part, $options->{primaryOrExtended});
    }
}

sub allocatePartitions {
    my ($all_hds, $to_add) = @_;

    foreach my $part_ (fs::get::holes($all_hds)) {
	my ($start, $size, $dev) = @$part_{"start", "size", "rootDevice"};
	my $part;
	while (suggest_part($part = { start => $start, size => 0, maxsize => $size, rootDevice => $dev }, 
			    $all_hds, $to_add)) {
	    my $hd = fs::get::part2hd($part, $all_hds);
	    add($hd, $part, $all_hds, {});
	    $size -= $part->{size} + $part->{start} - $start;
	    $start = $part->{start} + $part->{size};
	}
    }
}

sub auto_allocate {
    my ($all_hds, $o_suggestions) = @_;
    my $before = listlength(fs::get::fstab($all_hds));

    my $suggestions = $o_suggestions || $suggestions{simple};
    allocatePartitions($all_hds, $suggestions);

    if ($o_suggestions) {
	auto_allocate_raids($all_hds, $suggestions);
	if (auto_allocate_vgs($all_hds, $suggestions)) {
	    #- allocatePartitions needs to be called twice, once for allocating PVs, once for allocating LVs
	    my @vgs = map { $_->{VG_name} } @{$all_hds->{lvms}};
	    my @suggested_lvs = grep { member($_->{hd}, @vgs) } @$suggestions;
	    allocatePartitions($all_hds, \@suggested_lvs);
	}
    }

    partition_table::assign_device_numbers($_) foreach @{$all_hds->{hds}};

    if ($before == listlength(fs::get::fstab($all_hds))) {
	# find out why auto_allocate failed
	if (any { !fs::get::has_mntpoint($_->{mntpoint}, $all_hds) } @$suggestions) {
	    die N("Not enough free space for auto-allocating");
	} else {
	    die N("Nothing to do");
	}
    }
}

sub auto_allocate_raids {
    my ($all_hds, $suggestions) = @_;

    my @raids = grep { isRawRAID($_) } fs::get::fstab($all_hds) or return;

    require raid;
    my @mds = grep { $_->{hd} =~ /md/ } @$suggestions;
    foreach my $md (@mds) {
	my @raids_ = grep { !$md->{parts} || $md->{parts} =~ /\Q$_->{mntpoint}/ } @raids;
	@raids = difference2(\@raids, \@raids_);

	my %h = %$md;
	delete @h{'hd', 'parts'}; # keeping mntpoint, level, chunk-size, fs_type/pt_type
	$h{disks} = \@raids_;

	my $part = raid::new($all_hds->{raids}, %h);

	raid::updateSize($part);
	push @raids, $part; #- we can build raid over raid
    }
}

sub auto_allocate_vgs {
    my ($all_hds, $suggestions) = @_;

    my @pvs = grep { isRawLVM($_) } fs::get::fstab($all_hds) or return 0;

    my @vgs = grep { $_->{VG_name} } @$suggestions or return 0;

    partition_table::write($_) foreach @{$all_hds->{hds}};

    require lvm;

    foreach my $vg (@vgs) {
	my $lvm = new lvm($vg->{VG_name});
	push @{$all_hds->{lvms}}, $lvm;
	
	my @pvs_ = grep { !$vg->{parts} || $vg->{parts} =~ /\Q$_->{mntpoint}/ } @pvs;
	@pvs = difference2(\@pvs, \@pvs_);

	foreach my $part (@pvs_) {
	    raid::make($all_hds->{raids}, $part) if isRAID($part);
	    $part->{lvm} = $lvm->{VG_name};
	    delete $part->{mntpoint};
	    lvm::vg_add($part);
	    push @{$lvm->{disks}}, $part;
	}
	lvm::update_size($lvm);
    }
    1;
}

sub undo_prepare {
    my ($all_hds) = @_;
    require Data::Dumper;
    $Data::Dumper::Purity = 1;
    foreach (@{$all_hds->{hds}}) {
	my @h = @$_{@partition_table::fields2save};
	push @{$_->{undo}}, Data::Dumper->Dump([\@h], ['$h']);
    }
}
sub undo {
    my ($all_hds) = @_;
    foreach (@{$all_hds->{hds}}) {
	my $code = pop @{$_->{undo}} or next;
	my $h; eval $code;
	@$_{@partition_table::fields2save} = @$h;

	if ($_->{hasBeenDirty}) {
	    partition_table::will_tell_kernel($_, 'force_reboot'); #- next action needing write_partitions will force it. We can not do it now since more undo may occur, and we must not needReboot now
	}
    }
    
}

sub change_type {
    my ($type, $hd, $part) = @_;
    $type->{pt_type} != $part->{pt_type} || $type->{fs_type} ne $part->{fs_type} or return;
    fs::type::check($type->{fs_type}, $hd, $part);
    $hd->{isDirty} = 1;
    $part->{mntpoint} = '' if isSwap($part) && $part->{mntpoint} eq "swap";
    $part->{mntpoint} = '' if isRawLVM($type) || isRawRAID($type);
    set_isFormatted($part, 0);
    fs::type::set_type_subpart($part, $type);
    fs::mount_options::rationalize($part);
    1;
}

sub rescuept($) {
    my ($hd) = @_;
    my ($ext, @hd);

    my $dev = devices::make($hd->{device});
    open(my $F, "rescuept $dev|");
    local $_;
    while (<$F>) {
	my ($st, $si, $id) = /start=\s*(\d+),\s*size=\s*(\d+),\s*Id=\s*(\d+)/ or next;
	my $part = { start => $st, size => $si };
	fs::type::set_pt_type($part, hex($id));
	if (isExtended($part)) {
	    $ext = $part;
	} else {
	    push @hd, $part;
	}
    }
    close $F or die "rescuept failed";

    partition_table::raw::zero_MBR($hd);
    foreach (@hd) {
	my $b = partition_table::verifyInside($_, $ext);
	if ($b) {
	    $_->{start}--;
	    $_->{size}++;
	}
	local $_->{notFormatted};

	partition_table::add($hd, $_, ($b ? 'Extended' : 'Primary'), 1);
    }
}

sub compare_with_proc_partitions {
    my ($hd) = @_;

    my @l1 = partition_table::get_normal_parts($hd);
    my @l2 = grep { $_->{rootDevice} eq $hd->{device} } read_proc_partitions([$hd]);

    #- /proc/partitions includes partition with type "empty" and a non-null size
    #- so add them for comparison
    my ($len1, $len2) = (int(@l1) + $hd->{primary}{nb_special_empty}, int(@l2));

    if ($len1 != $len2 && arch() ne 'ppc') {
	die sprintf(
		    "/proc/partitions does not agree with drakx %d != %d:\n%s\n", $len1, $len2,
		    "/proc/partitions: " . join(", ", map { "$_->{device} ($_->{rootDevice})" } @l2));
    }
    $len2;
}

sub use_proc_partitions {
    my ($hd) = @_;

    partition_table::raw::zero_MBR($hd);
    $hd->{readonly} = 1;
    $hd->{getting_rid_of_readonly_allowed} = 1;
    $hd->{primary} = { normal => [ grep { $_->{rootDevice} eq $hd->{device} } read_proc_partitions([$hd]) ] };
}

1;