summaryrefslogtreecommitdiffstats
path: root/scripts/Dpkg/Arch.pm
blob: 0d352eeb90b8fa84b619689ce07640ab6a23773d (plain)
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
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
# Copyright © 2006-2015 Guillem Jover <guillem@debian.org>
#
# 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 of the License, 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, see <https://www.gnu.org/licenses/>.

=encoding utf8

=head1 NAME

Dpkg::Arch - handle architectures

=head1 DESCRIPTION

The Dpkg::Arch module provides functions to handle Debian architectures,
wildcards, and mapping from and to GNU triplets.

No symbols are exported by default. The :all tag can be used to import all
symbols. The :getters, :parsers, :mappers and :operators tags can be used
to import specific symbol subsets.

=cut

package Dpkg::Arch 1.03;

use strict;
use warnings;
use feature qw(state);

our @EXPORT_OK = qw(
    get_raw_build_arch
    get_raw_host_arch
    get_build_arch
    get_host_arch
    get_host_gnu_type
    get_valid_arches
    debarch_eq
    debarch_is
    debarch_is_wildcard
    debarch_is_illegal
    debarch_is_concerned
    debarch_to_abiattrs
    debarch_to_cpubits
    debarch_to_gnutriplet
    debarch_to_debtuple
    debarch_to_multiarch
    debarch_list_parse
    debtuple_to_debarch
    debtuple_to_gnutriplet
    gnutriplet_to_debarch
    gnutriplet_to_debtuple
    gnutriplet_to_multiarch
);
our %EXPORT_TAGS = (
    all => [ @EXPORT_OK ],
    getters => [ qw(
        get_raw_build_arch
        get_raw_host_arch
        get_build_arch
        get_host_arch
        get_host_gnu_type
        get_valid_arches
    ) ],
    parsers => [ qw(
        debarch_list_parse
    ) ],
    mappers => [ qw(
        debarch_to_abiattrs
        debarch_to_gnutriplet
        debarch_to_debtuple
        debarch_to_multiarch
        debtuple_to_debarch
        debtuple_to_gnutriplet
        gnutriplet_to_debarch
        gnutriplet_to_debtuple
        gnutriplet_to_multiarch
    ) ],
    operators => [ qw(
        debarch_eq
        debarch_is
        debarch_is_wildcard
        debarch_is_illegal
        debarch_is_concerned
    ) ],
);


use Exporter qw(import);
use List::Util qw(any);

use Dpkg ();
use Dpkg::Gettext;
use Dpkg::ErrorHandling;
use Dpkg::BuildEnv;

my (@cpu, @os);
my (%cputable, %ostable);
my (%cputable_re, %ostable_re);
my (%cpubits, %cpuendian);
my %abibits;

my %debtuple_to_debarch;
my %debarch_to_debtuple;

=head1 FUNCTIONS

=over 4

=item $arch = get_raw_build_arch()

Get the raw build Debian architecture, without taking into account variables
from the environment.

=cut

sub get_raw_build_arch()
{
    state $build_arch;

    return $build_arch if defined $build_arch;

    # Note: We *always* require an installed dpkg when inferring the
    # build architecture. The bootstrapping case is handled by
    # dpkg-architecture itself, by avoiding computing the DEB_BUILD_
    # variables when they are not requested.

    ## no critic (TestingAndDebugging::ProhibitNoWarnings)
    no warnings qw(exec);
    $build_arch = qx(dpkg --print-architecture);
    syserr('dpkg --print-architecture failed') if $? >> 8;

    chomp $build_arch;
    return $build_arch;
}

=item $arch = get_build_arch()

Get the build Debian architecture, using DEB_BUILD_ARCH from the environment
if available.

=cut

sub get_build_arch()
{
    return Dpkg::BuildEnv::get('DEB_BUILD_ARCH') || get_raw_build_arch();
}

{
    my %cc_host_gnu_type;

    sub get_host_gnu_type()
    {
        my $CC = $ENV{CC} || 'gcc';

        return $cc_host_gnu_type{$CC} if defined $cc_host_gnu_type{$CC};

        ## no critic (TestingAndDebugging::ProhibitNoWarnings)
        no warnings qw(exec);
        $cc_host_gnu_type{$CC} = qx($CC -dumpmachine);
	if ($? >> 8) {
            $cc_host_gnu_type{$CC} = '';
	} else {
            chomp $cc_host_gnu_type{$CC};
	}

        return $cc_host_gnu_type{$CC};
    }

    sub set_host_gnu_type
    {
        my ($host_gnu_type) = @_;
        my $CC = $ENV{CC} || 'gcc';

        $cc_host_gnu_type{$CC} = $host_gnu_type;
    }
}

=item $arch = get_raw_host_arch()

Get the raw host Debian architecture, without taking into account variables
from the environment.

=cut

sub get_raw_host_arch()
{
    state $host_arch;

    return $host_arch if defined $host_arch;

    my $host_gnu_type = get_host_gnu_type();

    if ($host_gnu_type eq '') {
        warning(g_('cannot determine CC system type, falling back to ' .
                   'default (native compilation)'));
    } else {
        my (@host_archtuple) = gnutriplet_to_debtuple($host_gnu_type);
        $host_arch = debtuple_to_debarch(@host_archtuple);

        if (defined $host_arch) {
            $host_gnu_type = debtuple_to_gnutriplet(@host_archtuple);
        } else {
            warning(g_('unknown CC system type %s, falling back to ' .
                       'default (native compilation)'), $host_gnu_type);
            $host_gnu_type = '';
        }
        set_host_gnu_type($host_gnu_type);
    }

    if (!defined($host_arch)) {
        # Switch to native compilation.
        $host_arch = get_raw_build_arch();
    }

    return $host_arch;
}

=item $arch = get_host_arch()

Get the host Debian architecture, using DEB_HOST_ARCH from the environment
if available.

=cut

sub get_host_arch()
{
    return Dpkg::BuildEnv::get('DEB_HOST_ARCH') || get_raw_host_arch();
}

=item @arch_list = get_valid_arches()

Get an array with all currently known Debian architectures.

=cut

sub get_valid_arches()
{
    _load_cputable();
    _load_ostable();

    my @arches;

    foreach my $os (@os) {
	foreach my $cpu (@cpu) {
	    my $arch = debtuple_to_debarch(split(/-/, $os, 3), $cpu);
	    push @arches, $arch if defined($arch);
	}
    }

    return @arches;
}

my %table_loaded;
sub _load_table
{
    my ($table, $loader) = @_;

    return if $table_loaded{$table};

    local $_;
    local $/ = "\n";

    open my $table_fh, '<', "$Dpkg::DATADIR/$table"
	or syserr(g_('cannot open %s'), $table);
    while (<$table_fh>) {
	$loader->($_);
    }
    close $table_fh;

    $table_loaded{$table} = 1;
}

sub _load_cputable
{
    _load_table('cputable', sub {
	if (m/^(?!\#)(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)/) {
	    $cputable{$1} = $2;
	    $cputable_re{$1} = $3;
	    $cpubits{$1} = $4;
	    $cpuendian{$1} = $5;
	    push @cpu, $1;
	}
    });
}

sub _load_ostable
{
    _load_table('ostable', sub {
	if (m/^(?!\#)(\S+)\s+(\S+)\s+(\S+)/) {
	    $ostable{$1} = $2;
	    $ostable_re{$1} = $3;
	    push @os, $1;
	}
    });
}

sub _load_abitable()
{
    _load_table('abitable', sub {
        if (m/^(?!\#)(\S+)\s+(\S+)/) {
            $abibits{$1} = $2;
        }
    });
}

sub _load_tupletable()
{
    _load_cputable();

    _load_table('tupletable', sub {
	if (m/^(?!\#)(\S+)\s+(\S+)/) {
	    my $debtuple = $1;
	    my $debarch = $2;

	    if ($debtuple =~ /<cpu>/) {
		foreach my $_cpu (@cpu) {
		    (my $dt = $debtuple) =~ s/<cpu>/$_cpu/;
		    (my $da = $debarch) =~ s/<cpu>/$_cpu/;

		    next if exists $debarch_to_debtuple{$da}
		         or exists $debtuple_to_debarch{$dt};

		    $debarch_to_debtuple{$da} = $dt;
		    $debtuple_to_debarch{$dt} = $da;
		}
	    } else {
		$debarch_to_debtuple{$2} = $1;
		$debtuple_to_debarch{$1} = $2;
	    }
	}
    });
}

sub debtuple_to_gnutriplet(@)
{
    my ($abi, $libc, $os, $cpu) = @_;

    _load_cputable();
    _load_ostable();

    return unless
        defined $abi && defined $libc && defined $os && defined $cpu &&
        exists $cputable{$cpu} && exists $ostable{"$abi-$libc-$os"};
    return join('-', $cputable{$cpu}, $ostable{"$abi-$libc-$os"});
}

sub gnutriplet_to_debtuple($)
{
    my $gnu = shift;
    return unless defined($gnu);
    my ($gnu_cpu, $gnu_os) = split(/-/, $gnu, 2);
    return unless defined($gnu_cpu) && defined($gnu_os);

    _load_cputable();
    _load_ostable();

    my ($os, $cpu);

    foreach my $_cpu (@cpu) {
	if ($gnu_cpu =~ /^$cputable_re{$_cpu}$/) {
	    $cpu = $_cpu;
	    last;
	}
    }

    foreach my $_os (@os) {
	if ($gnu_os =~ /^(.*-)?$ostable_re{$_os}$/) {
	    $os = $_os;
	    last;
	}
    }

    return if !defined($cpu) || !defined($os);
    return (split(/-/, $os, 3), $cpu);
}

=item $multiarch = gnutriplet_to_multiarch($gnutriplet)

Map a GNU triplet into a Debian multiarch triplet.

=cut

sub gnutriplet_to_multiarch($)
{
    my $gnu = shift;
    my ($cpu, $cdr) = split(/-/, $gnu, 2);

    if ($cpu =~ /^i[4567]86$/) {
	return "i386-$cdr";
    } else {
	return $gnu;
    }
}

=item $multiarch = debarch_to_multiarch($arch)

Map a Debian architecture into a Debian multiarch triplet.

=cut

sub debarch_to_multiarch($)
{
    my $arch = shift;

    return gnutriplet_to_multiarch(debarch_to_gnutriplet($arch));
}

sub debtuple_to_debarch(@)
{
    my ($abi, $libc, $os, $cpu) = @_;

    _load_tupletable();

    if (!defined $abi || !defined $libc || !defined $os || !defined $cpu) {
	return;
    } elsif (exists $debtuple_to_debarch{"$abi-$libc-$os-$cpu"}) {
	return $debtuple_to_debarch{"$abi-$libc-$os-$cpu"};
    } else {
	return;
    }
}

sub debarch_to_debtuple($)
{
    my $arch = shift;

    return if not defined $arch;

    _load_tupletable();

    if ($arch =~ /^linux-([^-]*)/) {
	# XXX: Might disappear in the future, not sure yet.
	$arch = $1;
    }

    my $tuple = $debarch_to_debtuple{$arch};

    if (defined($tuple)) {
        my @tuple = split /-/, $tuple, 4;
        return @tuple if wantarray;
        return {
            abi => $tuple[0],
            libc => $tuple[1],
            os => $tuple[2],
            cpu => $tuple[3],
        };
    } else {
	return;
    }
}

=item $gnutriplet = debarch_to_gnutriplet($arch)

Map a Debian architecture into a GNU triplet.

=cut

sub debarch_to_gnutriplet($)
{
    my $arch = shift;

    return debtuple_to_gnutriplet(debarch_to_debtuple($arch));
}

=item $arch = gnutriplet_to_debarch($gnutriplet)

Map a GNU triplet into a Debian architecture.

=cut

sub gnutriplet_to_debarch($)
{
    my $gnu = shift;

    return debtuple_to_debarch(gnutriplet_to_debtuple($gnu));
}

sub debwildcard_to_debtuple($)
{
    my $arch = shift;
    my @tuple = split /-/, $arch, 4;

    if (any { $_ eq 'any' } @tuple) {
	if (scalar @tuple == 4) {
	    return @tuple;
	} elsif (scalar @tuple == 3) {
	    return ('any', @tuple);
	} elsif (scalar @tuple == 2) {
	    return ('any', 'any', @tuple);
	} else {
	    return ('any', 'any', 'any', 'any');
	}
    } else {
	return debarch_to_debtuple($arch);
    }
}

sub debarch_to_abiattrs($)
{
    my $arch = shift;
    my ($abi, $libc, $os, $cpu) = debarch_to_debtuple($arch);

    if (defined($cpu)) {
        _load_abitable();

        return ($abibits{$abi} // $cpubits{$cpu}, $cpuendian{$cpu});
    } else {
        return;
    }
}

sub debarch_to_cpubits($)
{
    my $arch = shift;
    my $cpu;

    ((undef) x 3, $cpu) = debarch_to_debtuple($arch);

    if (defined $cpu) {
        return $cpubits{$cpu};
    } else {
        return;
    }
}

=item $bool = debarch_eq($arch_a, $arch_b)

Evaluate the equality of a Debian architecture, by comparing with another
Debian architecture. No wildcard matching is performed.

=cut

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

    return 1 if ($a eq $b);

    my @a = debarch_to_debtuple($a);
    my @b = debarch_to_debtuple($b);

    return 0 if scalar @a != 4 or scalar @b != 4;

    return $a[0] eq $b[0] && $a[1] eq $b[1] && $a[2] eq $b[2] && $a[3] eq $b[3];
}

=item $bool = debarch_is($arch, $arch_wildcard)

Evaluate the identity of a Debian architecture, by matching with an
architecture wildcard.

=cut

sub debarch_is($$)
{
    my ($real, $alias) = @_;

    return 1 if ($alias eq $real or $alias eq 'any');

    my @real = debarch_to_debtuple($real);
    my @alias = debwildcard_to_debtuple($alias);

    return 0 if scalar @real != 4 or scalar @alias != 4;

    if (($alias[0] eq $real[0] || $alias[0] eq 'any') &&
        ($alias[1] eq $real[1] || $alias[1] eq 'any') &&
        ($alias[2] eq $real[2] || $alias[2] eq 'any') &&
        ($alias[3] eq $real[3] || $alias[3] eq 'any')) {
	return 1;
    }

    return 0;
}

=item $bool = debarch_is_wildcard($arch)

Evaluate whether a Debian architecture is an architecture wildcard.

=cut

sub debarch_is_wildcard($)
{
    my $arch = shift;

    return 0 if $arch eq 'all';

    my @tuple = debwildcard_to_debtuple($arch);

    return 0 if scalar @tuple != 4;
    return 1 if any { $_ eq 'any' } @tuple;
    return 0;
}

=item $bool = debarch_is_illegal($arch, %options)

Validate an architecture name.

If the "positive" option is set to a true value, only positive architectures
will be accepted, otherwise negated architectures are allowed.

=cut

sub debarch_is_illegal
{
    my ($arch, %opts) = @_;
    my $arch_re = qr/[a-zA-Z0-9][a-zA-Z0-9-]*/;

    if ($opts{positive}) {
        return $arch !~ m/^$arch_re$/;
    } else {
        return $arch !~ m/^!?$arch_re$/;
    }
}

=item $bool = debarch_is_concerned($arch, @arches)

Evaluate whether a Debian architecture applies to the list of architecture
restrictions, as usually found in dependencies inside square brackets.

=cut

sub debarch_is_concerned
{
    my ($host_arch, @arches) = @_;

    my $seen_arch = 0;
    foreach my $arch (@arches) {
        $arch = lc $arch;

        if ($arch =~ /^!/) {
            my $not_arch = $arch;
            $not_arch =~ s/^!//;

            if (debarch_is($host_arch, $not_arch)) {
                $seen_arch = 0;
                last;
            } else {
                # !arch includes by default all other arches
                # unless they also appear in a !otherarch
                $seen_arch = 1;
            }
        } elsif (debarch_is($host_arch, $arch)) {
            $seen_arch = 1;
            last;
        }
    }
    return $seen_arch;
}

=item @array = debarch_list_parse($arch_list, %options)

Parse an architecture list.

If the "positive" option is set to a true value, only positive architectures
will be accepted, otherwise negated architectures are allowed.

=cut

sub debarch_list_parse
{
    my ($arch_list, %opts) = @_;
    my @arch_list = split ' ', $arch_list;

    foreach my $arch (@arch_list) {
        if (debarch_is_illegal($arch, %opts)) {
            error(g_("'%s' is not a legal architecture in list '%s'"),
                  $arch, $arch_list);
        }
    }

    return @arch_list;
}

1;

=back

=head1 CHANGES

=head2 Version 1.03 (dpkg 1.19.1)

New argument: Accept a "positive" option in debarch_is_illegal() and
debarch_list_parse().

=head2 Version 1.02 (dpkg 1.18.19)

New import tags: ":all", ":getters", ":parsers", ":mappers", ":operators".

=head2 Version 1.01 (dpkg 1.18.5)

New functions: debarch_is_illegal(), debarch_list_parse().

=head2 Version 1.00 (dpkg 1.18.2)

Mark the module as public.

=head1 SEE ALSO

L<dpkg-architecture(1)>.