summaryrefslogtreecommitdiffstats
path: root/Bugzilla/Install/Util.pm
blob: 14744ef8ce3dd6b02752314dc6eacfbb8c8e1209 (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
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
# -*- Mode: perl; indent-tabs-mode: nil -*-
#
# The contents of this file are subject to the Mozilla Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
# implied. See the License for the specific language governing
# rights and limitations under the License.
#
# The Original Code is the Bugzilla Bug Tracking System.
#
# The Initial Developer of the Original Code is Everything Solved.
# Portions created by Everything Solved are Copyright (C) 2006
# Everything Solved. All Rights Reserved.
#
# Contributor(s): Max Kanat-Alexander <mkanat@bugzilla.org>

package Bugzilla::Install::Util;

# The difference between this module and Bugzilla::Util is that this
# module may require *only* Bugzilla::Constants and built-in
# perl modules.

use strict;

use Bugzilla::Constants;

use Encode;
use ExtUtils::MM ();
use File::Basename;
use File::Spec;
use POSIX qw(setlocale LC_CTYPE);
use Safe;
use Scalar::Util qw(tainted);
use Term::ANSIColor qw(colored);
use PerlIO;

use base qw(Exporter);
our @EXPORT_OK = qw(
    bin_loc
    get_version_and_os
    extension_code_files
    extension_package_directory
    extension_requirement_packages
    extension_template_directory
    indicate_progress
    install_string
    include_languages
    success
    template_include_path
    vers_cmp
    init_console
);

sub bin_loc {
    my ($bin, $path) = @_;
    my @path = $path ? @$path : File::Spec->path;
    
    foreach my $dir (@path) {
        next if !-d $dir;
        my $full_path = File::Spec->catfile($dir, $bin);
        # MM is an alias for ExtUtils::MM. maybe_command is nice
        # because it checks .com, .bat, .exe (etc.) on Windows.
        my $command = MM->maybe_command($full_path);
        return $command if $command;
    }

    return '';
}

sub get_version_and_os {
    # Display version information
    my @os_details = POSIX::uname;
    # 0 is the name of the OS, 2 is the major version,
    my $os_name = $os_details[0] . ' ' . $os_details[2];
    if (ON_WINDOWS) {
        require Win32;
        $os_name = Win32::GetOSName();
    }
    # $os_details[3] is the minor version.
    return { bz_ver   => BUGZILLA_VERSION,
             perl_ver => sprintf('%vd', $^V),
             os_name  => $os_name,
             os_ver   => $os_details[3] };
}

sub _extension_paths {
    my $dir = bz_locations()->{'extensionsdir'};
    my @extension_items = glob("$dir/*");
    my @paths;
    foreach my $item (@extension_items) {
        my $basename = basename($item);
        # Skip CVS directories and any hidden files/dirs.
        next if ($basename eq 'CVS' or $basename =~ /^\./);
        if (-d $item) {
            if (!-e "$item/disabled") {
                push(@paths, $item);
            }
        }
        elsif ($item =~ /\.pm$/i) {
            push(@paths, $item);
        }
    }
    return @paths;
}

sub extension_code_files {
    my ($requirements_only) = @_;
    my @files;
    foreach my $path (_extension_paths()) {
        my @load_files;
        if (-d $path) {
            my $extension_file = "$path/Extension.pm";
            my $config_file    = "$path/Config.pm";
            if (-e $extension_file) {
                push(@load_files, $extension_file);
            }
            if (-e $config_file) {
                push(@load_files, $config_file);
            }

            # Don't load Extension.pm if we just want Config.pm and
            # we found both.
            if ($requirements_only and scalar(@load_files) == 2) {
                shift(@load_files);
            }
        }
        else {
            push(@load_files, $path);
        }
        next if !scalar(@load_files);
        # We know that these paths are safe, because they came from
        # extensionsdir and we checked them specifically for their format.
        # Also, the only thing we ever do with them is pass them to "require".
        trick_taint($_) foreach @load_files;
        push(@files, \@load_files);
    }

    my @additional;
    my $datadir = bz_locations()->{'datadir'};
    my $addl_file = "$datadir/extensions/additional";
    if (-e $addl_file) {
        open(my $fh, '<', $addl_file) || die "$addl_file: $!";
        @additional = map { trim($_) } <$fh>;
        close($fh);
    }
    return (\@files, \@additional);
}

# Used by _get_extension_requirements in Bugzilla::Install::Requirements.
sub extension_requirement_packages {
    # If we're in a .cgi script or some time that's not the requirements phase,
    # just use Bugzilla->extensions. This avoids running the below code during
    # a normal Bugzilla page, which is important because the below code
    # doesn't actually function right if it runs after 
    # Bugzilla::Extension->load_all (because stuff has already been loaded).
    # (This matters because almost every page calls Bugzilla->feature, which
    # calls OPTIONAL_MODULES, which calls this method.)
    #
    # We check if Bugzilla.pm is already loaded, instead of doing a "require",
    # because we *do* want the code lower down to run during the Requirements
    # phase of checksetup.pl, instead of Bugzilla->extensions, and Bugzilla.pm
    # actually *can* be loaded during the Requirements phase if all the
    # requirements have already been installed.
    if ($INC{'Bugzilla.pm'}) {
        return Bugzilla->extensions;
    }
    my $packages = _cache()->{extension_requirement_packages};
    return $packages if $packages;
    $packages = [];
    my %package_map;
    
    my ($file_sets, $extra_packages) = extension_code_files('requirements only');
    foreach my $file_set (@$file_sets) {
        my $file = shift @$file_set;
        my $name = require $file;
        if ($name =~ /^\d+$/) {
            die install_string('extension_must_return_name',
                               { file => $file, returned => $name });
        }
        my $package = "Bugzilla::Extension::$name";
        if ($package->can('package_dir')) {
            $package->package_dir($file);
        }
        else {
            extension_package_directory($package, $file);
        }
        $package_map{$file} = $package;
        push(@$packages, $package);
    }
    foreach my $package (@$extra_packages) {
        eval("require $package") || die $@;
        push(@$packages, $package);
    }

    _cache()->{extension_requirement_packages} = $packages;
    # Used by Bugzilla::Extension->load if it's called after this method
    # (which only happens during checksetup.pl, currently).
    _cache()->{extension_requirement_package_map} = \%package_map;
    return $packages;
}

# Used in this file and in Bugzilla::Extension.
sub extension_template_directory {
    my $extension = shift;
    my $class = ref($extension) || $extension;
    my $base_dir = extension_package_directory($class);
    if ($base_dir eq bz_locations->{'extensionsdir'}) {
        return bz_locations->{'templatedir'};
    }
    return "$base_dir/template";
}

# For extensions that are in the extensions/ dir, this both sets and fetches
# the name of the directory that stores an extension's "stuff". We need this
# when determining the template directory for extensions (or other things
# that are relative to the extension's base directory).
sub extension_package_directory {
    my ($invocant, $file) = @_;
    my $class = ref($invocant) || $invocant;

    my $var;
    { no strict 'refs'; $var = \${"${class}::EXTENSION_PACKAGE_DIR"}; }
    if ($file) {
        $$var = dirname($file);
    }
    my $value = $$var;

    # This is for extensions loaded from data/extensions/additional.
    if (!$value) {
        my $short_path = $class;
        $short_path =~ s/::/\//g;
        $short_path .= ".pm";
        my $long_path = $INC{$short_path};
        die "$short_path is not in \%INC" if !$long_path;
        $value = $long_path;
        $value =~ s/\.pm//;
    }
    return $value;
}

sub indicate_progress {
    my ($params) = @_;
    my $current = $params->{current};
    my $total   = $params->{total};
    my $every   = $params->{every} || 1;

    print "." if !($current % $every);
    if ($current == $total || $current % ($every * 60) == 0) {
        print "$current/$total (" . int($current * 100 / $total) . "%)\n";
    }
}

sub install_string {
    my ($string_id, $vars) = @_;
    _cache()->{install_string_path} ||= template_include_path();
    my $path = _cache()->{install_string_path};
    
    my $string_template;
    # Find the first template that defines this string.
    foreach my $dir (@$path) {
        my $base = "$dir/setup/strings";
        $string_template = _get_string_from_file($string_id, "$base.txt.pl")
            if !defined $string_template;
        last if defined $string_template;
    }
    
    die "No language defines the string '$string_id'"
        if !defined $string_template;

    utf8::decode($string_template) if !utf8::is_utf8($string_template);

    $vars ||= {};
    my @replace_keys = keys %$vars;
    foreach my $key (@replace_keys) {
        my $replacement = $vars->{$key};
        die "'$key' in '$string_id' is tainted: '$replacement'"
            if tainted($replacement);
        # We don't want people to start getting clever and inserting
        # ##variable## into their values. So we check if any other
        # key is listed in the *replacement* string, before doing
        # the replacement. This is mostly to protect programmers from
        # making mistakes.
        if (grep($replacement =~ /##$key##/, @replace_keys)) {
            die "Unsafe replacement for '$key' in '$string_id': '$replacement'";
        }
        $string_template =~ s/\Q##$key##\E/$replacement/g;
    }

    return $string_template;
}

sub _wanted_languages {
    my ($requested, @wanted);

    # Checking SERVER_SOFTWARE is the same as i_am_cgi() in Bugzilla::Util.
    if (exists $ENV{'SERVER_SOFTWARE'}) {
        my $cgi = eval { Bugzilla->cgi } || eval { require CGI; return CGI->new() };
        $requested = $cgi->http('Accept-Language') || '';
        my $lang = $cgi->cookie('LANG');
        push(@wanted, $lang) if $lang;
    }
    else {
        $requested = get_console_locale();
    }

    push(@wanted, _sort_accept_language($requested));
    return \@wanted;
}

sub _wanted_to_actual_languages {
    my ($wanted, $supported) = @_;

    my @actual;
    foreach my $lang (@$wanted) {
        # If we support the language we want, or *any version* of
        # the language we want, it gets pushed into @actual.
        #
        # Per RFC 1766 and RFC 2616, things like 'en' match 'en-us' and
        # 'en-uk', but not the other way around. (This is unfortunately
        # not very clearly stated in those RFC; see comment just over 14.5
        # in http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4)
        my @found = grep(/^\Q$lang\E(-.+)?$/i, @$supported);
        push(@actual, @found) if @found;
    }

    # We always include English at the bottom if it's not there, even if
    # it wasn't selected by the user.
    if (!grep($_ eq 'en', @actual)) {
        push(@actual, 'en');
    }

    return \@actual;
}

sub supported_languages {
    my $cache = _cache();
    return $cache->{supported_languages} if $cache->{supported_languages};

    my @dirs = glob(bz_locations()->{'templatedir'} . "/*");
    my @languages;
    foreach my $dir (@dirs) {
        # It's a language directory only if it contains "default" or
        # "custom". This auto-excludes CVS directories as well.
        next if (!-d "$dir/default" and !-d "$dir/custom");
        my $lang = basename($dir);
        # Check for language tag format conforming to RFC 1766.
        next unless $lang =~ /^[a-zA-Z]{1,8}(-[a-zA-Z]{1,8})?$/;
        push(@languages, $lang);
    }

    $cache->{supported_languages} = \@languages;
    return \@languages;
}

sub include_languages {
    my ($params) = @_;

    # Basically, the way this works is that we have a list of languages
    # that we *want*, and a list of languages that Bugzilla actually
    # supports.
    my $wanted;
    if ($params->{language}) {
        $wanted = [$params->{language}];
    }
    else {
        $wanted = _wanted_languages();
    }
    my $supported = supported_languages();
    my $actual    = _wanted_to_actual_languages($wanted, $supported);
    return @$actual;
}

# Used by template_include_path
sub _template_lang_directories {
    my ($languages, $templatedir) = @_;
    
    my @add = qw(custom default);
    my $project = bz_locations->{'project'};
    unshift(@add, $project) if $project;

    my @result;
    foreach my $lang (@$languages) {
        foreach my $dir (@add) {
            my $full_dir = "$templatedir/$lang/$dir";
            if (-d $full_dir) {
                trick_taint($full_dir);
                push(@result, $full_dir);
            }
        }
    }
    return @result;
}

# Used by template_include_path.
sub _template_base_directories {
    # First, we add extension template directories, because extension templates
    # override standard templates. Extensions may be localized in the same way
    # that Bugzilla templates are localized.
    #
    # We use extension_requirement_packages instead of Bugzilla->extensions
    # because this fucntion is called during the requirements phase of 
    # installation (so Bugzilla->extensions isn't available).
    my $extensions = extension_requirement_packages();
    my @template_dirs;
    foreach my $extension (@$extensions) {
        my $dir;
        # If there's a template_dir method available in the extension
        # package, then call it. Note that this has to be defined in
        # Config.pm for extensions that have a Config.pm, to be effective
        # during the Requirements phase of checksetup.pl.
        if ($extension->can('template_dir')) {
            $dir = $extension->template_dir;
        }
        else {
            $dir = extension_template_directory($extension);
        }
        if (-d $dir) {
            push(@template_dirs, $dir);
        }
    }

    # Extensions may also contain *only* templates, in which case they
    # won't show up in extension_requirement_packages.
    foreach my $path (_extension_paths()) {
        next if !-d $path;
        if (!-e "$path/Extension.pm" and !-e "$path/Config.pm"
            and -d "$path/template") 
        {
            push(@template_dirs, "$path/template");
        }
    }


    push(@template_dirs, bz_locations()->{'templatedir'});
    return \@template_dirs;
}

sub template_include_path {
    my ($params) = @_;
    my @used_languages = include_languages(@_);
    # Now, we add template directories in the order they will be searched:
    my $template_dirs = _template_base_directories(); 

    my @include_path;
    foreach my $template_dir (@$template_dirs) {
        my @lang_dirs = _template_lang_directories(\@used_languages, 
                                                   $template_dir);
        # Hooks get each set of extension directories separately.
        if ($params->{hook}) {
            push(@include_path, \@lang_dirs);
        }
        # Whereas everything else just gets a whole INCLUDE_PATH.
        else {
            push(@include_path, @lang_dirs);
        }
    }
    return \@include_path;
}

# This is taken straight from Sort::Versions 1.5, which is not included
# with perl by default.
sub vers_cmp {
    my ($a, $b) = @_;

    # Remove leading zeroes - Bug 344661
    $a =~ s/^0*(\d.+)/$1/;
    $b =~ s/^0*(\d.+)/$1/;

    my @A = ($a =~ /([-.]|\d+|[^-.\d]+)/g);
    my @B = ($b =~ /([-.]|\d+|[^-.\d]+)/g);

    my ($A, $B);
    while (@A and @B) {
        $A = shift @A;
        $B = shift @B;
        if ($A eq '-' and $B eq '-') {
            next;
        } elsif ( $A eq '-' ) {
            return -1;
        } elsif ( $B eq '-') {
            return 1;
        } elsif ($A eq '.' and $B eq '.') {
            next;
        } elsif ( $A eq '.' ) {
            return -1;
        } elsif ( $B eq '.' ) {
            return 1;
        } elsif ($A =~ /^\d+$/ and $B =~ /^\d+$/) {
            if ($A =~ /^0/ || $B =~ /^0/) {
                return $A cmp $B if $A cmp $B;
            } else {
                return $A <=> $B if $A <=> $B;
            }
        } else {
            $A = uc $A;
            $B = uc $B;
            return $A cmp $B if $A cmp $B;
        }
    }
    @A <=> @B;
}

sub no_checksetup_from_cgi {
    print "Content-Type: text/html; charset=UTF-8\r\n\r\n";
    print install_string('no_checksetup_from_cgi');
    exit;
}

######################
# Helper Subroutines #
######################

# Used by install_string
sub _get_string_from_file {
    my ($string_id, $file) = @_;
    
    return undef if !-e $file;
    my $safe = new Safe;
    $safe->rdo($file);
    my %strings = %{$safe->varglob('strings')};
    return $strings{$string_id};
}

# Make an ordered list out of a HTTP Accept-Language header (see RFC 2616, 14.4)
# We ignore '*' and <language-range>;q=0
# For languages with the same priority q the order remains unchanged.
sub _sort_accept_language {
    sub sortQvalue { $b->{'qvalue'} <=> $a->{'qvalue'} }
    my $accept_language = $_[0];

    # clean up string.
    $accept_language =~ s/[^A-Za-z;q=0-9\.\-,]//g;
    my @qlanguages;
    my @languages;
    foreach(split /,/, $accept_language) {
        if (m/([A-Za-z\-]+)(?:;q=(\d(?:\.\d+)))?/) {
            my $lang   = $1;
            my $qvalue = $2;
            $qvalue = 1 if not defined $qvalue;
            next if $qvalue == 0;
            $qvalue = 1 if $qvalue > 1;
            push(@qlanguages, {'qvalue' => $qvalue, 'language' => $lang});
        }
    }

    return map($_->{'language'}, (sort sortQvalue @qlanguages));
}

sub get_console_locale {
    require Locale::Language;
    my $locale = setlocale(LC_CTYPE);
    my $language;
    # Some distros set e.g. LC_CTYPE = fr_CH.UTF-8. We clean it up.
    if ($locale =~ /^([^\.]+)/) {
        $locale = $1;
    }
    $locale =~ s/_/-/;
    # It's pretty sure that there is no language pack of the form fr-CH
    # installed, so we also include fr as a wanted language.
    if ($locale =~ /^(\S+)\-/) {
        $language = $1;
        $locale .= ",$language";
    }
    else {
        $language = $locale;
    }

    # Some OSs or distributions may have setlocale return a string of the form
    # German_Germany.1252 (this example taken from a Windows XP system), which
    # is unsuitable for our needs because Bugzilla works on language codes.
    # We try and convert them here.
    if ($language = Locale::Language::language2code($language)) {
        $locale .= ",$language";
    }

    return $locale;
}

sub set_output_encoding {
    # If we've already set an encoding layer on STDOUT, don't
    # add another one.
    my @stdout_layers = PerlIO::get_layers(STDOUT);
    return if grep(/^encoding/, @stdout_layers);

    my $encoding;
    if (ON_WINDOWS and eval { require Win32::Console }) {
        # Although setlocale() works on Windows, it doesn't always return
        # the current *console's* encoding. So we use OutputCP here instead,
        # when we can.
        $encoding = Win32::Console::OutputCP();
    }
    else {
        my $locale = setlocale(LC_CTYPE);
        if ($locale =~ /\.([^\.]+)$/) {
            $encoding = $1;
        }
    }
    $encoding = "cp$encoding" if ON_WINDOWS;

    $encoding = Encode::resolve_alias($encoding) if $encoding;
    if ($encoding and $encoding !~ /utf-8/i) {
        binmode STDOUT, ":encoding($encoding)";
        binmode STDERR, ":encoding($encoding)";
    }
    else {
        binmode STDOUT, ':utf8';
        binmode STDERR, ':utf8';
    }
}

sub init_console {
    eval { ON_WINDOWS && require Win32::Console::ANSI; };
    $ENV{'ANSI_COLORS_DISABLED'} = 1 if ($@ || !-t *STDOUT);
    $SIG{__DIE__} = \&_console_die;
    prevent_windows_dialog_boxes();
    set_output_encoding();
}

sub _console_die {
    my ($message) = @_;
    # $^S means "we are in an eval"
    if ($^S) {
        die $message;
    }
    # Remove newlines from the message before we color it, and then
    # add them back in on display. Otherwise the ANSI escape code
    # for resetting the color comes after the newline, and Perl thinks
    # that it should put "at Bugzilla/Install.pm line 1234" after the
    # message.
    $message =~ s/\n+$//;
    # We put quotes around the message to stringify any object exceptions,
    # like Template::Exception.
    die colored("$message", COLOR_ERROR) . "\n";
}

sub success {
    my ($message) = @_;
    print colored($message, COLOR_SUCCESS), "\n";
}

sub prevent_windows_dialog_boxes {
    # This code comes from http://bugs.activestate.com/show_bug.cgi?id=82183
    # and prevents Perl modules from popping up dialog boxes, particularly
    # during checksetup (since loading DBD::Oracle during checksetup when
    # Oracle isn't installed causes a scary popup and pauses checksetup).
    #
    # Win32::API ships with ActiveState by default, though there could 
    # theoretically be a Windows installation without it, I suppose.
    if (ON_WINDOWS and eval { require Win32::API }) {
        # Call kernel32.SetErrorMode with arguments that mean:
        # "The system does not display the critical-error-handler message box.
        # Instead, the system sends the error to the calling process." and
        # "A child process inherits the error mode of its parent process."
        my $SetErrorMode = Win32::API->new('kernel32', 'SetErrorMode', 
                                           'I', 'I');
        my $SEM_FAILCRITICALERRORS = 0x0001;
        my $SEM_NOGPFAULTERRORBOX  = 0x0002;
        $SetErrorMode->Call($SEM_FAILCRITICALERRORS | $SEM_NOGPFAULTERRORBOX);
    }
}

# This is like request_cache, but it's used only by installation code
# for checksetup.pl and things like that.
our $_cache = {};
sub _cache {
    # If the normal request_cache is available (which happens any time
    # after the requirements phase) then we should use that.
    if (eval { Bugzilla->request_cache; }) {
        return Bugzilla->request_cache;
    }
    return $_cache;
}

###############################
# Copied from Bugzilla::Util #
##############################

sub trick_taint {
    require Carp;
    Carp::confess("Undef to trick_taint") unless defined $_[0];
    my $match = $_[0] =~ /^(.*)$/s;
    $_[0] = $match ? $1 : undef;
    return (defined($_[0]));
}

sub trim {
    my ($str) = @_;
    if ($str) {
      $str =~ s/^\s+//g;
      $str =~ s/\s+$//g;
    }
    return $str;
}

__END__

=head1 NAME

Bugzilla::Install::Util - Utility functions that are useful both during
installation and afterwards.

=head1 DESCRIPTION

This module contains various subroutines that are used primarily
during installation. However, these subroutines can also be useful to
non-installation code, so they have been split out into this module.

The difference between this module and L<Bugzilla::Util> is that this
module is safe to C<use> anywhere in Bugzilla, even during installation,
because it depends only on L<Bugzilla::Constants> and built-in perl modules.

None of the subroutines are exported by default--you must explicitly
export them.

=head1 SUBROUTINES

=over

=item C<bin_loc>

On *nix systems, given the name of a binary, returns the path to that
binary, if the binary is in the C<PATH>.

=item C<get_version_and_os>

Returns a hash containing information about what version of Bugzilla we're
running, what perl version we're using, and what OS we're running on.

=item C<get_console_locale>

Returns the language to use based on the LC_CTYPE value returned by the OS.
If LC_CTYPE is of the form fr-CH, then fr is appended to the list.

=item C<init_console>

Sets the C<ANSI_COLORS_DISABLED> and C<HTTP_ACCEPT_LANGUAGE> environment variables.

=item C<indicate_progress>

=over

=item B<Description>

This prints out lines of dots as a long update is going on, to let the user
know where we are and that we're not frozen. A new line of dots will start
every 60 dots.

Sample usage: C<indicate_progress({ total =E<gt> $total, current =E<gt>
$count, every =E<gt> 1 })>

=item B<Sample Output>

Here's some sample output with C<total = 1000> and C<every = 10>:

 ............................................................600/1000 (60%)
 ........................................

=item B<Params>

=over

=item C<total> - The total number of items we're processing.

=item C<current> - The number of the current item we're processing.

=item C<every> - How often the function should print out a dot.
For example, if this is 10, the function will print out a dot every
ten items. Defaults to 1 if not specified.

=back

=item B<Returns>: nothing

=back

=item C<install_string>

=over

=item B<Description>

This is a very simple method of templating strings for installation.
It should only be used by code that has to run before the Template Toolkit
can be used. (See the comments at the top of the various L<Bugzilla::Install>
modules to find out when it's safe to use Template Toolkit.)

It pulls strings out of the F<strings.txt.pl> "template" and replaces
any variable surrounded by double-hashes (##) with a value you specify.

This allows for localization of strings used during installation.

=item B<Example>

Let's say your template string looks like this:

 The ##animal## jumped over the ##plant##.

Let's say that string is called 'animal_jump_plant'. So you call the function
like this:

 install_string('animal_jump_plant', { animal => 'fox', plant => 'tree' });

That will output this:

 The fox jumped over the tree.

=item B<Params>

=over

=item C<$string_id> - The name of the string from F<strings.txt.pl>.

=item C<$vars> - A hashref containing the replacement values for variables
inside of the string.

=back

=item B<Returns>: The appropriate string, with variables replaced.

=back

=item C<template_include_path>

Used by L<Bugzilla::Template> and L</install_string> to determine the
directories where templates are installed. Templates can be installed
in many places. They're listed here in the basic order that they're
searched:

=over

=item extensions/C<$extension>/template/C<$language>/C<$project>

=item extensions/C<$extension>/template/C<$language>/custom

=item extensions/C<$extension>/template/C<$language>/default

=item template/C<$language>/C<$project>

=item template/C<$language>/custom

=item template/C<$language>/default

=back

C<$project> has to do with installations that are using the C<$ENV{PROJECT}>
variable to have different "views" on a single Bugzilla.

The F<default> directory includes templates shipped with Bugzilla.

The F<custom> directory is a directory for local installations to override
the F<default> templates. Any individual template in F<custom> will
override a template of the same name and path in F<default>.

C<$language> is a language code, C<en> being the default language shipped
with Bugzilla. Localizers ship other languages.

C<$extension> is the name of any directory in the F<extensions/> directory.
Each extension has its own directory.

Note that languages are sorted by the user's preference (as specified
in their browser, usually), and extensions are sorted alphabetically.

=item C<include_languages>

Used by L<Bugzilla::Template> to determine the languages' list which 
are compiled with the browser's I<Accept-Language> and the languages 
of installed templates.

=item C<vers_cmp>

=over

=item B<Description>

This is a comparison function, like you would use in C<sort>, except that
it compares two version numbers. So, for example, 2.10 would be greater
than 2.2.

It's based on versioncmp from L<Sort::Versions>, with some Bugzilla-specific
fixes.

=item B<Params>: C<$a> and C<$b> - The versions you want to compare.

=item B<Returns>

C<-1> if C<$a> is less than C<$b>, C<0> if they are equal, or C<1> if C<$a>
is greater than C<$b>.

=back

=back