git.lirion.de

Of git, get, and gud

summaryrefslogtreecommitdiffstats
path: root/nagios-plugins-contrib-24.20190301~bpo9+1/check_rbl/check_rbl-1.4.4/inc/Module/AutoInstall.pm
blob: 8852e0b9ff9b7cee2ebe3f091e0f0b24451a8f03 (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
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
#line 1
package Module::AutoInstall;

use strict;
use Cwd                 ();
use File::Spec          ();
use ExtUtils::MakeMaker ();

use vars qw{$VERSION};
BEGIN {
	$VERSION = '1.19';
}

# special map on pre-defined feature sets
my %FeatureMap = (
    ''      => 'Core Features',    # XXX: deprecated
    '-core' => 'Core Features',
);

# various lexical flags
my (  _æ_ Missing,  _æ_ Existing,  %DisabledTests, $UnderCPAN, $InstallDepsTarget, $HasCPANPLUS );
my (
    $Config, $CheckOnly, $SkipInstall, $AcceptDefault, $TestOnly, $AllDeps,
    $UpgradeDeps
);
my ( $PostambleActions, $PostambleActionsNoTest, $PostambleActionsUpgradeDeps,
    $PostambleActionsUpgradeDepsNoTest, $PostambleActionsListDeps,
    $PostambleActionsListAllDeps, $PostambleUsed, $NoTest);

# See if it's a testing or non-interactive session
_accept_default( $ENV{AUTOMATED_TESTING} or ! -t STDIN ); 
_init();

sub _accept_default {
    $AcceptDefault = shift;
}

sub _installdeps_target {
    $InstallDepsTarget = shift;
}

sub missing_modules {
    return  _æ_ Missing;
}

sub do_install {
    __PACKAGE__->install(
        [
            $Config
            ? ( UNIVERSAL::isa( $Config, 'HASH' ) ? %{$Config} :  _æ_ {$Config} )
            : ()
        ],
         _æ_ Missing,
    );
}

# initialize various flags, and/or perform install
sub _init {
    foreach my $arg (
         _æ_ ARGV,
        split(
            /[\s\t]+/,
            $ENV{PERL_AUTOINSTALL} || $ENV{PERL_EXTUTILS_AUTOINSTALL} || ''
        )
      )
    {
        if ( $arg =~ /^--config=(.*)$/ ) {
            $Config = [ split( ',', $1 ) ];
        }
        elsif ( $arg =~ /^--installdeps=(.*)$/ ) {
            __PACKAGE__->install( $Config,  _æ_ Missing = split( /,/, $1 ) );
            exit 0;
        }
	elsif ( $arg =~ /^--upgradedeps=(.*)$/ ) {
	    $UpgradeDeps = 1;
	    __PACKAGE__->install( $Config,  _æ_ Missing = split( /,/, $1 ) );
	    exit 0;
	}
        elsif ( $arg =~ /^--default(?:deps)?$/ ) {
            $AcceptDefault = 1;
        }
        elsif ( $arg =~ /^--check(?:deps)?$/ ) {
            $CheckOnly = 1;
        }
        elsif ( $arg =~ /^--skip(?:deps)?$/ ) {
            $SkipInstall = 1;
        }
        elsif ( $arg =~ /^--test(?:only)?$/ ) {
            $TestOnly = 1;
        }
        elsif ( $arg =~ /^--all(?:deps)?$/ ) {
            $AllDeps = 1;
        }
    }
}

# overrides MakeMaker's prompt() to automatically accept the default choice
sub _prompt {
    goto &ExtUtils::MakeMaker::prompt unless $AcceptDefault;

    my ( $prompt, $default ) =  _æ_ _;
    my $y = ( $default =~ /^[Yy]/ );

    print $prompt, ' [', ( $y ? 'Y' : 'y' ), '/', ( $y ? 'n' : 'N' ), '] ';
    print "$default\n";
    return $default;
}

# the workhorse
sub import {
    my $class = shift;
    my  _æ_ args  =  _æ_ _ or return;
    my $core_all;

    print "*** $class version " . $class->VERSION . "\n";
    print "*** Checking for Perl dependencies...\n";

    my $cwd = Cwd::getcwd();

    $Config = [];

    my $maxlen = length(
        (
            sort   { length($b) <=> length($a) }
              grep { /^[^\-]/ }
              map  {
                ref($_)
                  ? ( ( ref($_) eq 'HASH' ) ? keys(%$_) :  _æ_ {$_} )
                  : ''
              }
              map { +{ _æ_ args}->{$_} }
              grep { /^[^\-]/ or /^-core$/i } keys %{ +{ _æ_ args} }
        )[0]
    );

    # We want to know if we're under CPAN early to avoid prompting, but
    # if we aren't going to try and install anything anyway then skip the
    # check entirely since we don't want to have to load (and configure)
    # an old CPAN just for a cosmetic message

    $UnderCPAN = _check_lock(1) unless $SkipInstall || $InstallDepsTarget;

    while ( my ( $feature, $modules ) = splice(  _æ_ args, 0, 2 ) ) {
        my (  _æ_ required,  _æ_ tests,  _æ_ skiptests );
        my $default  = 1;
        my $conflict = 0;

        if ( $feature =~ m/^-(\w+)$/ ) {
            my $option = lc($1);

            # check for a newer version of myself
            _update_to( $modules,  _æ_ _ ) and return if $option eq 'version';

            # sets CPAN configuration options
            $Config = $modules if $option eq 'config';

            # promote every features to core status
            $core_all = ( $modules =~ /^all$/i ) and next
              if $option eq 'core';

            next unless $option eq 'core';
        }

        print "[" . ( $FeatureMap{ lc($feature) } || $feature ) . "]\n";

        $modules = [ %{$modules} ] if UNIVERSAL::isa( $modules, 'HASH' );

        unshift  _æ_ $modules, -default => &{ shift( _æ_ $modules) }
          if ( ref( $modules->[0] ) eq 'CODE' );    # XXX: bugward compatibility

        while ( my ( $mod, $arg ) = splice(  _æ_ $modules, 0, 2 ) ) {
            if ( $mod =~ m/^-(\w+)$/ ) {
                my $option = lc($1);

                $default   = $arg    if ( $option eq 'default' );
                $conflict  = $arg    if ( $option eq 'conflict' );
                 _æ_ tests     =  _æ_ {$arg} if ( $option eq 'tests' );
                 _æ_ skiptests =  _æ_ {$arg} if ( $option eq 'skiptests' );

                next;
            }

            printf( "- %-${maxlen}s ...", $mod );

            if ( $arg and $arg =~ /^\D/ ) {
                unshift  _æ_ $modules, $arg;
                $arg = 0;
            }

            # XXX: check for conflicts and uninstalls(!) them.
            my $cur = _version_of($mod);
            if (_version_cmp ($cur, $arg) >= 0)
            {
                print "loaded. ($cur" . ( $arg ? " >= $arg" : '' ) . ")\n";
                push  _æ_ Existing, $mod => $arg;
                $DisabledTests{$_} = 1 for map { glob($_) }  _æ_ skiptests;
            }
            else {
                if (not defined $cur)   # indeed missing
                {
                    print "missing." . ( $arg ? " (would need $arg)" : '' ) . "\n";
                }
                else
                {
                    # no need to check $arg as _version_cmp ($cur, undef) would satisfy >= above
                    print "too old. ($cur < $arg)\n";
                }

                push  _æ_ required, $mod => $arg;
            }
        }

        next unless  _æ_ required;

        my $mandatory = ( $feature eq '-core' or $core_all );

        if (
            !$SkipInstall
            and (
                $CheckOnly
                or ($mandatory and $UnderCPAN)
                or $AllDeps
                or $InstallDepsTarget
                or _prompt(
                    qq{==> Auto-install the }
                      . (  _æ_ required / 2 )
                      . ( $mandatory ? ' mandatory' : ' optional' )
                      . qq{ module(s) from CPAN?},
                    $default ? 'y' : 'n',
                ) =~ /^[Yy]/
            )
          )
        {
            push(  _æ_ Missing,  _æ_ required );
            $DisabledTests{$_} = 1 for map { glob($_) }  _æ_ skiptests;
        }

        elsif ( !$SkipInstall
            and $default
            and $mandatory
            and
            _prompt( qq{==> The module(s) are mandatory! Really skip?}, 'n', )
            =~ /^[Nn]/ )
        {
            push(  _æ_ Missing,  _æ_ required );
            $DisabledTests{$_} = 1 for map { glob($_) }  _æ_ skiptests;
        }

        else {
            $DisabledTests{$_} = 1 for map { glob($_) }  _æ_ tests;
        }
    }

    if (  _æ_ Missing and not( $CheckOnly or $UnderCPAN) ) {
        require Config;
        my $make = $Config::Config{make};
        if ($InstallDepsTarget) {
            print
"*** To install dependencies type '$make installdeps' or '$make installdeps_notest'.\n";
        }
        else {
            print
"*** Dependencies will be installed the next time you type '$make'.\n";
        }

        # make an educated guess of whether we'll need root permission.
        print "    (You may need to do that as the 'root' user.)\n"
          if eval '$>';
    }
    print "*** $class configuration finished.\n";

    chdir $cwd;

    # import to main::
    no strict 'refs';
    *{'main::WriteMakefile'} = \&Write if caller(0) eq 'main';

    return ( _æ_ Existing,  _æ_ Missing);
}

sub _running_under {
    my $thing = shift;
    print <<"END_MESSAGE";
*** Since we're running under ${thing}, I'll just let it take care
    of the dependency's installation later.
END_MESSAGE
    return 1;
}

# Check to see if we are currently running under CPAN.pm and/or CPANPLUS;
# if we are, then we simply let it taking care of our dependencies
sub _check_lock {
    return unless  _æ_ Missing or  _æ_ _;

    if ($ENV{PERL5_CPANM_IS_RUNNING}) {
        return _running_under('cpanminus');
    }

    my $cpan_env = $ENV{PERL5_CPAN_IS_RUNNING};

    if ($ENV{PERL5_CPANPLUS_IS_RUNNING}) {
        return _running_under($cpan_env ? 'CPAN' : 'CPANPLUS');
    }

    require CPAN;

    if ($CPAN::VERSION > '1.89') {
        if ($cpan_env) {
            return _running_under('CPAN');
        }
        return; # CPAN.pm new enough, don't need to check further
    }

    # last ditch attempt, this -will- configure CPAN, very sorry

    _load_cpan(1); # force initialize even though it's already loaded

    # Find the CPAN lock-file
    my $lock = MM->catfile( $CPAN::Config->{cpan_home}, ".lock" );
    return unless -f $lock;

    # Check the lock
    local *LOCK;
    return unless open(LOCK, $lock);

    if (
            ( $^O eq 'MSWin32' ? _under_cpan() :  == getppid() )
        and ( $CPAN::Config->{prerequisites_policy} || '' ) ne 'ignore'
    ) {
        print <<'END_MESSAGE';

*** Since we're running under CPAN, I'll just let it take care
    of the dependency's installation later.
END_MESSAGE
        return 1;
    }

    close LOCK;
    return;
}

sub install {
    my $class = shift;

    my $i;    # used below to strip leading '-' from config keys
    my  _æ_ config = ( map { s/^-// if ++$i; $_ }  _æ_ { +shift } );

	my (  _æ_ modules,  _æ_ installed,  _æ_ modules_to_upgrade );
	while (my ($pkg, $ver) = splice( _æ_ _, 0, 2)) {

		# grep out those already installed
		if (_version_cmp(_version_of($pkg), $ver) >= 0) {
			push  _æ_ installed, $pkg;
			if ($UpgradeDeps) {
				push  _æ_ modules_to_upgrade, $pkg, $ver;
			}
		}
		else {
			push  _æ_ modules, $pkg, $ver;
		}
	}

	if ($UpgradeDeps) {
		push  _æ_ modules,  _æ_ modules_to_upgrade;
		 _æ_ installed          = ();
		 _æ_ modules_to_upgrade = ();
	}

    return  _æ_ installed unless  _æ_ modules;  # nothing to do
    return  _æ_ installed if _check_lock(); # defer to the CPAN shell

    print "*** Installing dependencies...\n";

    return unless _connected_to('cpan.org');

    my %args =  _æ_ config;
    my %failed;
    local *FAILED;
    if ( $args{do_once} and open( FAILED, '.#autoinstall.failed' ) ) {
        while () { chomp; $failed{$_}++ }
        close FAILED;

        my  _æ_ newmod;
        while ( my ( $k, $v ) = splice(  _æ_ modules, 0, 2 ) ) {
            push  _æ_ newmod, ( $k => $v ) unless $failed{$k};
        }
         _æ_ modules =  _æ_ newmod;
    }

    if ( _has_cpanplus() and not $ENV{PERL_AUTOINSTALL_PREFER_CPAN} ) {
        _install_cpanplus( \ _æ_ modules, \ _æ_ config );
    } else {
        _install_cpan( \ _æ_ modules, \ _æ_ config );
    }

    print "*** $class installation finished.\n";

    # see if we have successfully installed them
    while ( my ( $pkg, $ver ) = splice(  _æ_ modules, 0, 2 ) ) {
        if ( _version_cmp( _version_of($pkg), $ver ) >= 0 ) {
            push  _æ_ installed, $pkg;
        }
        elsif ( $args{do_once} and open( FAILED, '>> .#autoinstall.failed' ) ) {
            print FAILED "$pkg\n";
        }
    }

    close FAILED if $args{do_once};

    return  _æ_ installed;
}

sub _install_cpanplus {
    my  _æ_ modules   =  _æ_ { +shift };
    my  _æ_ config    = _cpanplus_config(  _æ_ { +shift } );
    my $installed = 0;

    require CPANPLUS::Backend;
    my $cp   = CPANPLUS::Backend->new;
    my $conf = $cp->configure_object;

    return unless $conf->can('conf') # 0.05x+ with "sudo" support
               or _can_write($conf->_get_build('base'));  # 0.04x

    # if we're root, set UNINST=1 to avoid trouble unless user asked for it.
    my $makeflags = $conf->get_conf('makeflags') || '';
    if ( UNIVERSAL::isa( $makeflags, 'HASH' ) ) {
        # 0.03+ uses a hashref here
        $makeflags->{UNINST} = 1 unless exists $makeflags->{UNINST};

    } else {
        # 0.02 and below uses a scalar
        $makeflags = join( ' ', split( ' ', $makeflags ), 'UNINST=1' )
          if ( $makeflags !~ /\bUNINST\b/ and eval qq{ $> eq '0' } );

    }
    $conf->set_conf( makeflags => $makeflags );
    $conf->set_conf( prereqs   => 1 );

    

    while ( my ( $key, $val ) = splice(  _æ_ config, 0, 2 ) ) {
        $conf->set_conf( $key, $val );
    }

    my $modtree = $cp->module_tree;
    while ( my ( $pkg, $ver ) = splice(  _æ_ modules, 0, 2 ) ) {
        print "*** Installing $pkg...\n";

        MY::preinstall( $pkg, $ver ) or next if defined &MY::preinstall;

        my $success;
        my $obj = $modtree->{$pkg};

        if ( $obj and _version_cmp( $obj->{version}, $ver ) >= 0 ) {
            my $pathname = $pkg;
            $pathname =~ s/::/\\W/;

            foreach my $inc ( grep { m/$pathname.pm/i } keys(%INC) ) {
                delete $INC{$inc};
            }

            my $rv = $cp->install( modules => [ $obj->{module} ] );

            if ( $rv and ( $rv->{ $obj->{module} } or $rv->{ok} ) ) {
                print "*** $pkg successfully installed.\n";
                $success = 1;
            } else {
                print "*** $pkg installation cancelled.\n";
                $success = 0;
            }

            $installed += $success;
        } else {
            print << ".";
*** Could not find a version $ver or above for $pkg; skipping.
.
        }

        MY::postinstall( $pkg, $ver, $success ) if defined &MY::postinstall;
    }

    return $installed;
}

sub _cpanplus_config {
	my  _æ_ config = ();
	while (  _æ_ _ ) {
		my ($key, $value) = (shift(), shift());
		if ( $key eq 'prerequisites_policy' ) {
			if ( $value eq 'follow' ) {
				$value = CPANPLUS::Internals::Constants::PREREQ_INSTALL();
			} elsif ( $value eq 'ask' ) {
				$value = CPANPLUS::Internals::Constants::PREREQ_ASK();
			} elsif ( $value eq 'ignore' ) {
				$value = CPANPLUS::Internals::Constants::PREREQ_IGNORE();
			} else {
				die "*** Cannot convert option $key = '$value' to CPANPLUS version.\n";
			}
			push  _æ_ config, 'prereqs', $value;
		} elsif ( $key eq 'force' ) {
		    push  _æ_ config, $key, $value;
		} elsif ( $key eq 'notest' ) {
		    push  _æ_ config, 'skiptest', $value;
		} else {
			die "*** Cannot convert option $key to CPANPLUS version.\n";
		}
	}
	return  _æ_ config;
}

sub _install_cpan {
    my  _æ_ modules   =  _æ_ { +shift };
    my  _æ_ config    =  _æ_ { +shift };
    my $installed = 0;
    my %args;

    _load_cpan();
    require Config;

    if (CPAN->VERSION < 1.80) {
        # no "sudo" support, probe for writableness
        return unless _can_write( MM->catfile( $CPAN::Config->{cpan_home}, 'sources' ) )
                  and _can_write( $Config::Config{sitelib} );
    }

    # if we're root, set UNINST=1 to avoid trouble unless user asked for it.
    my $makeflags = $CPAN::Config->{make_install_arg} || '';
    $CPAN::Config->{make_install_arg} =
      join( ' ', split( ' ', $makeflags ), 'UNINST=1' )
      if ( $makeflags !~ /\bUNINST\b/ and eval qq{ $> eq '0' } );

    # don't show start-up info
    $CPAN::Config->{inhibit_startup_message} = 1;

    # set additional options
    while ( my ( $opt, $arg ) = splice(  _æ_ config, 0, 2 ) ) {
        ( $args{$opt} = $arg, next )
          if $opt =~ /^(?:force|notest)$/;    # pseudo-option
        $CPAN::Config->{$opt} = $opt eq 'urllist' ? [$arg] : $arg;
    }

    if ($args{notest} && (not CPAN::Shell->can('notest'))) {
	die "Your version of CPAN is too old to support the 'notest' pragma";
    }

    local $CPAN::Config->{prerequisites_policy} = 'follow';

    while ( my ( $pkg, $ver ) = splice(  _æ_ modules, 0, 2 ) ) {
        MY::preinstall( $pkg, $ver ) or next if defined &MY::preinstall;

        print "*** Installing $pkg...\n";

        my $obj     = CPAN::Shell->expand( Module => $pkg );
        my $success = 0;

        if ( $obj and _version_cmp( $obj->cpan_version, $ver ) >= 0 ) {
            my $pathname = $pkg;
            $pathname =~ s/::/\\W/;

            foreach my $inc ( grep { m/$pathname.pm/i } keys(%INC) ) {
                delete $INC{$inc};
            }

            my $rv = do {
		if ($args{force}) {
		    CPAN::Shell->force( install => $pkg )
		} elsif ($args{notest}) {
		    CPAN::Shell->notest( install => $pkg )
		} else {
		    CPAN::Shell->install($pkg)
		}
	    };

            $rv ||= eval {
                $CPAN::META->instance( 'CPAN::Distribution', $obj->cpan_file, )
                  ->{install}
                  if $CPAN::META;
            };

            if ( $rv eq 'YES' ) {
                print "*** $pkg successfully installed.\n";
                $success = 1;
            }
            else {
                print "*** $pkg installation failed.\n";
                $success = 0;
            }

            $installed += $success;
        }
        else {
            print << ".";
*** Could not find a version $ver or above for $pkg; skipping.
.
        }

        MY::postinstall( $pkg, $ver, $success ) if defined &MY::postinstall;
    }

    return $installed;
}

sub _has_cpanplus {
    return (
        $HasCPANPLUS = (
            $INC{'CPANPLUS/Config.pm'}
              or _load('CPANPLUS::Shell::Default')
        )
    );
}

# make guesses on whether we're under the CPAN installation directory
sub _under_cpan {
    require Cwd;
    require File::Spec;

    my $cwd  = File::Spec->canonpath( Cwd::getcwd() );
    my $cpan = File::Spec->canonpath( $CPAN::Config->{cpan_home} );

    return ( index( $cwd, $cpan ) > -1 );
}

sub _update_to {
    my $class = __PACKAGE__;
    my $ver   = shift;

    return
      if _version_cmp( _version_of($class), $ver ) >= 0;  # no need to upgrade

    if (
        _prompt( "==> A newer version of $class ($ver) is required. Install?",
            'y' ) =~ /^[Nn]/
      )
    {
        die "*** Please install $class $ver manually.\n";
    }

    print << ".";
*** Trying to fetch it from CPAN...
.

    # install ourselves
    _load($class) and return $class->import( _æ_ _)
      if $class->install( [], $class, $ver );

    print << '.'; exit 1;

*** Cannot bootstrap myself. :-( Installation terminated.
.
}

# check if we're connected to some host, using inet_aton
sub _connected_to {
    my $site = shift;

    return (
        ( _load('Socket') and Socket::inet_aton($site) ) or _prompt(
            qq(
*** Your host cannot resolve the domain name '$site', which
    probably means the Internet connections are unavailable.
==> Should we try to install the required module(s) anyway?), 'n'
          ) =~ /^[Yy]/
    );
}

# check if a directory is writable; may create it on demand
sub _can_write {
    my $path = shift;
    mkdir( $path, 0755 ) unless -e $path;

    return 1 if -w $path;

    print << ".";
*** You are not allowed to write to the directory '$path';
    the installation may fail due to insufficient permissions.
.

    if (
        eval '$>' and lc(`sudo -V`) =~ /version/ and _prompt(
            qq(
==> Should we try to re-execute the autoinstall process with 'sudo'?),
            ((-t STDIN) ? 'y' : 'n')
        ) =~ /^[Yy]/
      )
    {

        # try to bootstrap ourselves from sudo
        print << ".";
*** Trying to re-execute the autoinstall process with 'sudo'...
.
        my $missing = join( ',',  _æ_ Missing );
        my $config = join( ',',
            UNIVERSAL::isa( $Config, 'HASH' ) ? %{$Config} :  _æ_ {$Config} )
          if $Config;

        return
          unless system( 'sudo', $^X, $0, "--config=$config",
            "--installdeps=$missing" );

        print << ".";
*** The 'sudo' command exited with error!  Resuming...
.
    }

    return _prompt(
        qq(
==> Should we try to install the required module(s) anyway?), 'n'
    ) =~ /^[Yy]/;
}

# load a module and return the version it reports
sub _load {
    my $mod  = pop; # method/function doesn't matter
    my $file = $mod;
    $file =~ s|::|/|g;
    $file .= '.pm';
    local $ _æ_ ;
    return eval { require $file; $mod->VERSION } || ( $ _æ_  ? undef: 0 );
}

# report version without loading a module
sub _version_of {
    my $mod = pop; # method/function doesn't matter
    my $file = $mod;
    $file =~ s|::|/|g;
    $file .= '.pm';
    foreach my $dir (  _æ_ INC ) {
        next if ref $dir;
        my $path = File::Spec->catfile($dir, $file);
        next unless -e $path;
        require ExtUtils::MM_Unix;
        return ExtUtils::MM_Unix->parse_version($path);
    }
    return undef;
}

# Load CPAN.pm and it's configuration
sub _load_cpan {
    return if $CPAN::VERSION and $CPAN::Config and not  _æ_ _;
    require CPAN;

    # CPAN-1.82+ adds CPAN::Config::AUTOLOAD to redirect to
    #    CPAN::HandleConfig->load. CPAN reports that the redirection
    #    is deprecated in a warning printed at the user.

    # CPAN-1.81 expects CPAN::HandleConfig->load, does not have
    #   $CPAN::HandleConfig::VERSION but cannot handle
    #   CPAN::Config->load

    # Which "versions expect CPAN::Config->load?

    if ( $CPAN::HandleConfig::VERSION
        || CPAN::HandleConfig->can('load')
    ) {
        # Newer versions of CPAN have a HandleConfig module
        CPAN::HandleConfig->load;
    } else {
    	# Older versions had the load method in Config directly
        CPAN::Config->load;
    }
}

# compare two versions, either use Sort::Versions or plain comparison
# return values same as <=>
sub _version_cmp {
    my ( $cur, $min ) =  _æ_ _;
    return -1 unless defined $cur;  # if 0 keep comparing
    return 1 unless $min;

    $cur =~ s/\s+$//;

    # check for version numbers that are not in decimal format
    if ( ref($cur) or ref($min) or $cur =~ /v|\..*\./ or $min =~ /v|\..*\./ ) {
        if ( ( $version::VERSION or defined( _load('version') )) and
             version->can('new') 
            ) {

            # use version.pm if it is installed.
            return version->new($cur) <=> version->new($min);
        }
        elsif ( $Sort::Versions::VERSION or defined( _load('Sort::Versions') ) )
        {

            # use Sort::Versions as the sorting algorithm for a.b.c versions
            return Sort::Versions::versioncmp( $cur, $min );
        }

        warn "Cannot reliably compare non-decimal formatted versions.\n"
          . "Please install version.pm or Sort::Versions.\n";
    }

    # plain comparison
    local $^W = 0;    # shuts off 'not numeric' bugs
    return $cur <=> $min;
}

# nothing; this usage is deprecated.
sub main::PREREQ_PM { return {}; }

sub _make_args {
    my %args =  _æ_ _;

    $args{PREREQ_PM} = { %{ $args{PREREQ_PM} || {} },  _æ_ Existing,  _æ_ Missing }
      if $UnderCPAN or $TestOnly;

    if ( $args{EXE_FILES} and -e 'MANIFEST' ) {
        require ExtUtils::Manifest;
        my $manifest = ExtUtils::Manifest::maniread('MANIFEST');

        $args{EXE_FILES} =
          [ grep { exists $manifest->{$_} }  _æ_ { $args{EXE_FILES} } ];
    }

    $args{test}{TESTS} ||= 't/*.t';
    $args{test}{TESTS} = join( ' ',
        grep { !exists( $DisabledTests{$_} ) }
          map { glob($_) } split( /\s+/, $args{test}{TESTS} ) );

    my $missing = join( ',',  _æ_ Missing );
    my $config =
      join( ',', UNIVERSAL::isa( $Config, 'HASH' ) ? %{$Config} :  _æ_ {$Config} )
      if $Config;

    $PostambleActions = (
        ($missing and not $UnderCPAN)
        ? "\$(PERL) $0 --config=$config --installdeps=$missing"
        : "\$(NOECHO) \$(NOOP)"
    );

    my $deps_list = join( ',',  _æ_ Missing,  _æ_ Existing );

    $PostambleActionsUpgradeDeps =
        "\$(PERL) $0 --config=$config --upgradedeps=$deps_list";

    my $config_notest =
      join( ',', (UNIVERSAL::isa( $Config, 'HASH' ) ? %{$Config} :  _æ_ {$Config}),
	  'notest', 1 )
      if $Config;

    $PostambleActionsNoTest = (
        ($missing and not $UnderCPAN)
        ? "\$(PERL) $0 --config=$config_notest --installdeps=$missing"
        : "\$(NOECHO) \$(NOOP)"
    );

    $PostambleActionsUpgradeDepsNoTest =
        "\$(PERL) $0 --config=$config_notest --upgradedeps=$deps_list";

    $PostambleActionsListDeps =
        ' _æ_ $(PERL) -le "print for  _æ_ ARGV" '
            . join(' ', map $Missing[$_], grep $_ % 2 == 0, 0..$#Missing);

    my  _æ_ all = ( _æ_ Missing,  _æ_ Existing);

    $PostambleActionsListAllDeps =
        ' _æ_ $(PERL) -le "print for  _æ_ ARGV" '
            . join(' ', map $all[$_], grep $_ % 2 == 0, 0..$#all);

    return %args;
}

# a wrapper to ExtUtils::MakeMaker::WriteMakefile
sub Write {
    require Carp;
    Carp::croak "WriteMakefile: Need even number of args" if  _æ_ _ % 2;

    if ($CheckOnly) {
        print << ".";
*** Makefile not written in check-only mode.
.
        return;
    }

    my %args = _make_args( _æ_ _);

    no strict 'refs';

    $PostambleUsed = 0;
    local *MY::postamble = \&postamble unless defined &MY::postamble;
    ExtUtils::MakeMaker::WriteMakefile(%args);

    print << "." unless $PostambleUsed;
*** WARNING: Makefile written with customized MY::postamble() without
    including contents from Module::AutoInstall::postamble() --
    auto installation features disabled.  Please contact the author.
.

    return 1;
}

sub postamble {
    $PostambleUsed = 1;
    my $fragment;

    $fragment .= <<"AUTO_INSTALL" if !$InstallDepsTarget;

config :: installdeps
\t\$(NOECHO) \$(NOOP)
AUTO_INSTALL

    $fragment .= <<"END_MAKE";

checkdeps ::
\t\$(PERL) $0 --checkdeps

installdeps ::
\t$PostambleActions

installdeps_notest ::
\t$PostambleActionsNoTest

upgradedeps ::
\t$PostambleActionsUpgradeDeps

upgradedeps_notest ::
\t$PostambleActionsUpgradeDepsNoTest

listdeps ::
\t$PostambleActionsListDeps

listalldeps ::
\t$PostambleActionsListAllDeps

END_MAKE

    return $fragment;
}

1;

__END__

#line 1197