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authorThierry Vignaud <tvignaud@mandriva.org>2003-09-07 03:48:45 +0000
committerThierry Vignaud <tvignaud@mandriva.org>2003-09-07 03:48:45 +0000
commitd30aa455eae8a9f74b3a2d9b5417df2ae4a448c0 (patch)
tree84bbec5c32c245759162d07487b54d73eaeefca5 /perl-install/Xconfig/xfree.pm
parent2327665fc3d19ed2de26a8d5448aa6e2e7867a8a (diff)
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package devices; # $Id: devices.pm 270810 2010-09-09 08:11:23Z bor $

use diagnostics;
use strict;

use common;
use run_program;
use log;
use c;

sub del_loop {
    my ($dev) = @_;
    run_program::run("losetup", "-d", $dev);
}
sub find_free_loop() {
    foreach (0..255) {
	my $dev = make("loop$_");
	sysopen(my $F, $dev, 2) or next;
	!ioctl($F, c::LOOP_GET_STATUS(), my $_tmp) && $! == 6 or next; #- 6 == ENXIO
	return $dev;
    }
    die "no free loop found";
}
sub set_loop {
    my ($file, $o_encrypt_key, $o_encryption) = @_;
    require modules;
    eval { modules::load('loop') };
    my $dev = find_free_loop();

    if ($o_encrypt_key && $o_encryption) {
	eval { modules::load('cryptoloop', 'cbc', if_(arch() =~ /i.86/, 'aes-i586'), if_(arch() =~ /x86_64/, 'aes-x86_64'), 'aes_generic') };
	my $cmd = "losetup -p 0 -e $o_encryption $dev $file";
	log::l("calling $cmd");
	open(my $F, "|$cmd");
	print $F $o_encrypt_key;
	close $F or die "losetup failed";
    } else {
	run_program::run("losetup", $dev, $file)
	    || run_program::run("losetup", "-r", $dev, $file) or return;
    }
    $dev;
}

sub find_compressed_image {
    my ($name) = @_;
    foreach (0..255) {
	my $dev = make("loop$_");
	my ($file) = `losetup $dev 2>/dev/null` =~ m!\((.*?)\)! or return;
	$file =~ s!^/sysroot/!/!;
	basename($file) eq $name and return $dev, $file;
    }
    undef;
}

sub get_dynamic_major {
    my ($name) = @_;
    cat_('/proc/devices') =~ /^(\d+) \Q$name\E$/m && $1;
}

sub init_device_mapper() {
    require modules;
    eval { modules::load('dm-mod') };
    make('urandom');
    my $control = '/dev/mapper/control';
    if (! -e $control) {
	my ($major) = get_dynamic_major('misc') or return;
	my ($minor) = cat_('/proc/misc') =~ /(\d+) device-mapper$/m or return;
	mkdir_p(dirname($control));
	syscall_('mknod', $control, c::S_IFCHR() | 0600, makedev($major, $minor)) or die "mknod $control failed: $!";	
    }
}

sub entry {
    my ($type, $major, $minor);
    local ($_) = @_;

    if (/^0x([\da-f]{3,4})$/i) {
	$type = c::S_IFBLK();
	($major, $minor) = unmakedev(hex $1);
    } elsif (/^ram(.*)/) {
	$type = c::S_IFBLK();
	$major = 1;
	$minor = $1 eq '' ? 1 : $1;
    } elsif (m|^rd/c(\d+)d(\d+)(p(\d+))?|) {
	# dac 960 "rd/cXdXXpX"
        $type = c::S_IFBLK();
	$major = 48 + $1;
	$minor = 8 * $2 + $4;
    } elsif (m,(ida|cciss)/c(\d+)d(\d+)(?:p(\d+))?,) {
	# Compaq Smart Array "ida/c0d0{p1}"
	$type = c::S_IFBLK();
	$major = ($1 eq 'ida' ? 72 : 104) + $2;
	$minor = 16 * $3 + ($4 || 0);
    } elsif (m,(ataraid)/d(\d+)(?:p(\d+))?,) {
	# ATA raid "ataraid/d0{p1}"
	$type = c::S_IFBLK();
	$major = 114;
	$minor = 16 * $1 + ($2 || 0);
    } elsif (my ($prefix, $nb) = /(.*?)(\d+)$/) {	
	my $f = ${{"fd"          => sub { c::S_IFBLK(), 2,  0  },
		   "hidbp-mse-"  => sub { c::S_IFCHR(), 10, 32 },
		   "lp"          => sub { c::S_IFCHR(), 6,  0  },
		   "usb/lp"      => sub { c::S_IFCHR(), 180, 0 },
		   "input/event" => sub { c::S_IFCHR(), 13, 64 },
		   "loop"        => sub { c::S_IFBLK(), 7,  0  },
		   "md"          => sub { c::S_IFBLK(), 9,  0  },
		   "nst"         => sub { c::S_IFCHR(), 9, 128 },
		   "sr"          => sub { c::S_IFBLK(), 11, 0  },
		   "tty"         => sub { c::S_IFCHR(), 4,  0  },
		   "ttyS"        => sub { c::S_IFCHR(), 4, 64  },
		   "ubd/"        => sub { c::S_IFBLK(), 98, 0  },
		   "dm-"         => sub { c::S_IFBLK(), get_dynamic_major('device-mapper'), 0 },
	       }}{$prefix};
	if ($f) {
	    ($type, $major, $minor) = $f->();
	    $minor += $nb;
        }
    }