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package Initrd;
# $Id: Initrd.pm,v 1.17 2002/12/18 16:29:31 sdague Exp $
# Copyright (c) 2001-2002 International Business Machines
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
# Sean Dague <sean@dague.net>
# Vasilios Hoffman <greekboy@users.sourceforge.net>
use strict;
use Carp;
use POSIX;
use File::Copy;
use Util::Log qw(:all);
use Util::Cmd qw(:all);
use base qw(Exporter);
use vars qw(@EXPORT $VERSION @rdtypes);
use Initrd::SuSE;
use Initrd::RH;
use Initrd::Debian;
$VERSION = sprintf("%d.%02d", q$Revision: 1.17 $ =~ /(\d+)\.(\d+)/);
=head1 NAME
Initrd - builds initial ramdisks for kernels
=head1 SYNOPSIS
Initrd::setup($config);
=head1 DESCRIPTION
The Initrd module generates initial ramdisks for kernels, provided there is enough userland tools and kernel support to allow this.
=head1 AUTHOR
Sean Dague <sean@dague.net>
Vasilios Hoffman <greekboy@users.sourceforge.net>
=head1 SEE ALSO
L<Config>,
L<perl>
=cut
sub setup {
my $config = shift;
my (@ramdisks,@files) = ();
foreach my $rdtype (@rdtypes) {
verbose("Testing for ramdisk type '$rdtype'");
if($rdtype->footprint()) {
verbose("Setting up ramdisk type '$rdtype'");
@files = setup_ramdisks($config, $rdtype);
last if scalar(@files);
}
}
return @files;
}
# Pretty simple, we pass in the config and the ramdisk type.
# If the kernel file exists, and the ramdisk doesn't, we try to build it.
# If the ramdisk now exists we add it to $config, which should propogate
# back up.
sub setup_ramdisks {
my ($config, $rdtype) = @_;
my @files = ();
my @kernels = get_kernels($config);
foreach my $kernel (@kernels) {
my $kernelfile = $config->get($kernel . "_path");
my $ramdisk = $config->get($kernel . "_initrd");
my $rootdev = get_rootdev($config, $kernel);
verbose("Setting up kernel: $kernelfile for root device: $rootdev");
if(-e $kernelfile and !$ramdisk) {
$ramdisk = $rdtype->setup($kernelfile, $rootdev);
if($ramdisk and -e $ramdisk) {
$config->set($kernel . "_initrd", $ramdisk);
push @files, $ramdisk;
}
}
}
return @files;
}
sub get_rootdev {
my ($config, $kernel) = @_;
my $rootdev = $config->get($kernel . "_rootdev");
$rootdev ||= $config->get('boot_rootdev');
return $rootdev;
}
sub get_kernels {
my $config = shift;
my %kernels = $config->varlist("^kernel");
my @keys = grep(/kernel\d+_path/, (sort keys %kernels));
my @kernels = map {s/_path//; $_} @keys;
return @kernels;
}
1;
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