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Current Path : /scripts/
Current File : //scripts/disable_prelink
#!/usr/local/cpanel/3rdparty/bin/perl

# cpanel - scripts/disable_prelink                   Copyright 2017 cPanel, Inc.
#                                                           All rights Reserved.
# copyright@cpanel.net                                         http://cpanel.net
# This code is subject to the cPanel license. Unauthorized copying is prohibited

package scripts::disable_prelink;

use parent qw( Cpanel::HelpfulScript );

use strict;
use warnings;
use Try::Tiny;

use Cpanel::Autodie          ();
use Cpanel::FileUtils::Write ();
use Cpanel::LoadFile         ();

our $sysconfig_file      = '/etc/sysconfig/prelink';
our $cron_prelink_script = '/etc/cron.daily/prelink';

my $exit = 0;
$exit = __PACKAGE__->new(@ARGV)->run() unless caller();

=encoding utf-8

=head1 NAME

disable_prelink

=head1 USAGE

scripts/disable_prelink [--help]

=head1 DESCRIPTION

This script disables RPM prelinking. It is run nightly so we are sure it does not re-appear.

If you want to disable this behavior, you can touch /var/cpanel/dont_remove_prelink.

B<WARNING>: Prelinking often causes issues, and we no longer support it as of cPanel & WHM version 54.
When you enable prelinking, you may experience problems with broken RPMs.

See https://documentation.cpanel.net/display/CKB/How+to+Disable+Prelinking for further information

=cut

sub run {
    return 0 if prelink_is_wanted();
    return 0 unless prelink_is_installed();
    return 0 unless prelink_is_enabled();

    # For more information, see CPANEL-4332.
    print "Prelink is installed and enabled. This can cause cPanel RPMs to break during yum updates.\n";

    return disable_prelink();
}

sub prelink_is_wanted {
    return Cpanel::Autodie::exists_nofollow('/var/cpanel/dont_remove_prelink');

}

sub prelink_is_installed {

    # qx{} so as to suppress output
    my $check_prelink = qx{/bin/rpm -q prelink 2>&1};

    # If prelink is uninstalled, rpm exits 1.
    return $? ? 0 : 1;
}

sub prelink_is_enabled {
    my $prelink_contents = Cpanel::LoadFile::load($sysconfig_file);

    return if !$prelink_contents;    # The File is missing.
    return 1 if $prelink_contents =~ m{^\s*PRELINKING\s*=\s*yes\b}m;
    return 0;
}

sub disable_prelink {
    local ( $/, $? );

    my $prelink_contents = Cpanel::LoadFile::load($sysconfig_file);

    $prelink_contents =~ s{^\s*PRELINKING\s*=\s*yes\s*$}{PRELINKING=no}m;

    Cpanel::FileUtils::Write::overwrite_no_exceptions( $sysconfig_file, $prelink_contents, 0644 );

    if ( -e $cron_prelink_script ) {
        system "$cron_prelink_script 2>&1";
        my $status = $? >> 8;
        return $status == 0 ? 1 : 0;
    }
    else {
        print "ERROR: $cron_prelink_script is missing. Could not fully disable prelinking.\n";
        return 2;
    }
}

sub _OPTIONS { return }
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