#!/usr/bin/perl

use Template;
use File::Spec;

my $version_extract_re = qr/kernel-([\d.]+)-gentoo(-r\d+)?/;
my $kernel_glob = '/boot/kernel-*';
my $grub_conf = '/boot/grub/grub.conf';

my $template = Template->new();

my $vars = {
    kernels => [
                map {
                    /$version_extract_re/ and
                    {
                        ver => $1,
                        rev => $2 || '',
                    }
                } reverse sort glob $kernel_glob
               ],
    zero => File::Spec->rel2abs($0),
};

my $out = '';
$template->process(\*DATA, $vars, \$out);

open my $grub, '>', $grub_conf or die "Can't write to $grub_conf: $!";
print $grub $out;


__DATA__
#
# generated by [%zero%]
#

# Boot automatically after 10 secs.
timeout 10

# By default, boot the first entry.
default 0

# Fallback to the second entry.
fallback 1

[%- FOREACH kernels %]
title  Gentoo [%ver%][%rev%]
root   (hd0,0)
kernel /kernel-[%ver%]-gentoo[%rev%] root=/dev/sda3
[% END %]

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In reply to Regenerating grub.conf by Tanktalus

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