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d13a73e383
The following commit will make use of a Getopt::Long feature which is
only present in Perl >= 5.8.1. Document that as the minimum version we
support.
Many of our Perl scripts will continue to run with 5.8.0 but this change
allows us to adjust them as needed without breaking any promises to our
users.
The Perl requirement was last changed in d48b284183 (perl: bump the
required Perl version to 5.8 from 5.6.[21], 2010-09-24). At that time,
5.8.0 was 8 years old. It is now over 21 years old.
Signed-off-by: Todd Zullinger <tmz@pobox.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
104 lines
3.4 KiB
Perl
104 lines
3.4 KiB
Perl
package Git::LoadCPAN;
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use 5.008001;
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use strict;
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use warnings $ENV{GIT_PERL_FATAL_WARNINGS} ? qw(FATAL all) : ();
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=head1 NAME
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Git::LoadCPAN - Wrapper for loading modules from the CPAN (OS) or Git's own copy
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=head1 DESCRIPTION
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The Perl code in Git depends on some modules from the CPAN, but we
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don't want to make those a hard requirement for anyone building from
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source.
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Therefore the L<Git::LoadCPAN> namespace shipped with Git contains
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wrapper modules like C<Git::LoadCPAN::Module::Name> that will first
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attempt to load C<Module::Name> from the OS, and if that doesn't work
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will fall back on C<FromCPAN::Module::Name> shipped with Git itself.
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Usually distributors will not ship with Git's Git::FromCPAN tree at
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all via the C<NO_PERL_CPAN_FALLBACKS> option, preferring to use their
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own packaging of CPAN modules instead.
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This module is only intended to be used for code shipping in the
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C<git.git> repository. Use it for anything else at your peril!
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=cut
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# NO_PERL_CPAN_FALLBACKS_STR evades the sed search-replace from the
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# Makefile, and allows for detecting whether the module is loaded from
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# perl/Git as opposed to perl/build/Git, which is useful for one-off
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# testing without having Error.pm et al installed.
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use constant NO_PERL_CPAN_FALLBACKS_STR => '@@' . 'NO_PERL_CPAN_FALLBACKS' . '@@';
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use constant NO_PERL_CPAN_FALLBACKS => (
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q[@@NO_PERL_CPAN_FALLBACKS@@] ne ''
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and
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q[@@NO_PERL_CPAN_FALLBACKS@@] ne NO_PERL_CPAN_FALLBACKS_STR
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);
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sub import {
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shift;
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my $caller = caller;
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my %args = @_;
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my $module = exists $args{module} ? delete $args{module} : die "BUG: Expected 'module' parameter!";
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my $import = exists $args{import} ? delete $args{import} : die "BUG: Expected 'import' parameter!";
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die "BUG: Too many arguments!" if keys %args;
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# Foo::Bar to Foo/Bar.pm
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my $package_pm = $module;
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$package_pm =~ s[::][/]g;
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$package_pm .= '.pm';
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eval {
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require $package_pm;
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1;
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} or do {
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my $error = $@ || "Zombie Error";
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if (NO_PERL_CPAN_FALLBACKS) {
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chomp(my $error = sprintf <<'THEY_PROMISED', $module);
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BUG: The '%s' module is not here, but NO_PERL_CPAN_FALLBACKS was set!
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Git needs this Perl module from the CPAN, and will by default ship
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with a copy of it. This Git was built with NO_PERL_CPAN_FALLBACKS,
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meaning that whoever built it promised to provide this module.
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You're seeing this error because they broke that promise, and we can't
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load our fallback version, since we were asked not to install it.
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If you're seeing this error and didn't package Git yourself the
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package you're using is broken, or your system is broken. This error
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won't appear if Git is built without NO_PERL_CPAN_FALLBACKS (instead
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we'll use our fallback version of the module).
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THEY_PROMISED
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die $error;
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}
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my $Git_LoadCPAN_pm_path = $INC{"Git/LoadCPAN.pm"} || die "BUG: Should have our own path from %INC!";
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require File::Basename;
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my $Git_LoadCPAN_pm_root = File::Basename::dirname($Git_LoadCPAN_pm_path) || die "BUG: Can't figure out lib/Git dirname from '$Git_LoadCPAN_pm_path'!";
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require File::Spec;
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my $Git_pm_FromCPAN_root = File::Spec->catdir($Git_LoadCPAN_pm_root, '..', 'FromCPAN');
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die "BUG: '$Git_pm_FromCPAN_root' should be a directory!" unless -d $Git_pm_FromCPAN_root;
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local @INC = ($Git_pm_FromCPAN_root, @INC);
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require $package_pm;
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};
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if ($import) {
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no strict 'refs';
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*{"${caller}::import"} = sub {
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shift;
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use strict 'refs';
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unshift @_, $module;
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goto &{"${module}::import"};
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};
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use strict 'refs';
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}
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}
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1;
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