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Filename : cpan_config
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#!/usr/bin/perl

# cpanel - scripts/cpan_config                     Copyright 2022 cPanel, L.L.C.
#                                                           All rights reserved.
# copyright@cpanel.net                                         http://cpanel.net
# This code is subject to the cPanel license. Unauthorized copying is prohibited

BEGIN { unshift @INC, '/usr/local/cpanel'; }

use strict;
use warnings;    # DO NOT REMOVE. NEEDED FOR PATH LOOKUP

use Cpanel::CleanINC       ();
use Cpanel::cPCPAN         ();
use Cpanel::cPCPAN::Config ();

if ( $> != 0 ) {
    die "Unable to set system CPAN::Config. Permission denied.\n";
}

my $cpanbasedir = '/home';

my $cpan = { 'basedir' => $cpanbasedir };

my $cpan_config = Cpanel::cPCPAN::fetch_config($cpan);

my $path = $INC{'warnings.pm'};
$path =~ s/\/warnings\.pm$//;
if ( !-e $path . '/CPAN' ) {
    mkdir $path . '/CPAN';
}

my $cpan_config_file = $path . '/CPAN/Config.pm';

my $now = time;
if ( -e $cpan_config_file ) {
    rename $cpan_config_file, $cpan_config_file . '.' . $now or die "Unable to archive $cpan_config_file: $!";
    print "Existing $cpan_config_file archived as ${cpan_config_file}.${now}\n";
}

if ( open my $conf_fh, '>', $cpan_config_file ) {
    my $localtime = localtime($now);
    print {$conf_fh} <<"EOM";
# This CPAN::Config was automatically generated using /usr/local/cpanel/scripts/cpan_config
# at $localtime
#
# If this Config.pm replaced an existing version, then it would be located at:
#     ${cpan_config_file}.${now}


# This is CPAN.pm's systemwide configuration file. This file provides
# defaults for users, and the values can be changed in a per-user
# configuration file.

EOM
    print {$conf_fh} qq{\$CPAN::Config = \{\n};
    foreach my $key ( sort keys %{$cpan_config} ) {
        print {$conf_fh} "  '$key' => ", neatvalue( $cpan_config->{$key} ), ",\n";
    }
    print {$conf_fh} "};\n1;\n__END__\n";
    close $conf_fh;
}

# stolen from MakeMaker; not taking the original because it is buggy;
# bugreport will have to say: keys of hashes remain unquoted and can
# produce syntax errors
sub neatvalue {
    my ($value) = @_;
    return 'undef' unless defined $value;
    my $ref_type = ref $value;
    unless ($ref_type) {
        $value =~ s/\\/\\\\/g;
        return "q[$value]";
    }
    if ( $ref_type eq 'ARRAY' ) {
        my ( @m, @neat );
        push @m, '[';
        foreach my $elem (@$value) {
            push @neat, "q[$elem]";
        }
        push @m, join ', ', @neat;
        push @m, ']';
        return join '', @m;
    }
    return "$value" unless $ref_type eq 'HASH';
    my ( @m, $key, $val );
    while ( ( $key, $val ) = each %$value ) {
        last unless defined $key;    # cautious programming in case (undef,undef) is true
        push( @m, "q[$key]=>" . neatvalue($val) );
    }
    return '{ ' . join( ', ', @m ) . ' }';
}