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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 += $nb;
}
}
unless ($type) {
($type, $major, $minor) =
@{ ${{"aztcd" => [ c::S_IFBLK(), 29, 0 ],
"bpcd" => [ c::S_IFBLK(), 41, 0 ],
"cdu31a" => [ c::S_IFBLK(), 15, 0 ],
"cdu535" => [ c::S_IFBLK(), 24, 0 ],
"cm206cd" => [ c::S_IFBLK(), 32, 0 ],
"gscd" => [ c::S_IFBLK(), 16, 0 ],
"mcd" => [ c::S_IFBLK(), 23, 0 ],
"mcdx" => [ c::S_IFBLK(), 20, 0 ],
"mem" => [ c::S_IFCHR(), 1, 1 ],
"optcd" => [ c::S_IFBLK(), 17, 0 ],
"kbd" => [ c::S_IFCHR(), 11, 0 ],
"psaux" => [ c::S_IFCHR(), 10, 1 ],
"atibm" => [ c::S_IFCHR(), 10, 3 ],
"random" => [ c::S_IFCHR(), 1, 8 ],
"urandom" => [ c::S_IFCHR(), 1, 9 ],
"sbpcd" => [ c::S_IFBLK(), 25, 0 ],
"sjcd" => [ c::S_IFBLK(), 18, 0 ],
"tty" => [ c::S_IFCHR(), 5, 0 ],
"input/mice"
=> [ c::S_IFCHR(), 13, 63 ],
"adbmouse" => [ c::S_IFCHR(), 10, 10 ], #- PPC
"vcsa" => [ c::S_IFCHR(), 7, 128 ],
"zero" => [ c::S_IFCHR(), 1, 5 ],
"null" => [ c::S_IFCHR(), 1, 3 ],
"initrd" => [ c::S_IFBLK(), 1, 250 ],
"console" => [ c::S_IFCHR(), 5, 1 ],
"systty" => [ c::S_IFCHR(), 4, 0 ],
"lvm" => [ c::S_IFBLK(), 109, 0 ],
}}{$_} || [] };
}
# Lookup non listed devices in /sys
unless ($type) {
my $sysdev;
if (m!input/(.*)! && -e "/sys/class/input/$1/dev") {
$sysdev = "/sys/class/input/$1/dev";
$type = c::S_IFCHR();
} elsif (-e "/sys/block/$_/dev") {
$sysdev = "/sys/block/$_/dev";
$type = c::S_IFBLK();
} elsif (/^(.+)(\d+)$/ && -e "/sys/block/$1/$_/dev") {
$sysdev = "/sys/block/$1/$_/dev";
$type = c::S_IFBLK();
}
($major, $minor) = split(':', chomp_(cat_($sysdev)));
}
# Lookup partitions in /proc/partitions in case /sys was not available
unless ($type) {
if (-e "/proc/partitions") {
if (cat_("/proc/partitions") =~ /^\s*(\d+)\s+(\d+)\s+\d+\s+$_$/m) {
($major, $minor) = ($1, $2);
$type = c::S_IFBLK();
}
}
}
# Try to access directly the device
# Now device mapper devices are links and do not appear in /proc or /sys
unless ($type) {
if (-e "/dev/$_") {
my (undef, undef, $mode, undef, undef, undef, $rdev, undef) = stat("/dev/$_");
($major, $minor) = unmakedev($rdev);
$type = $mode & c::S_IFMT();
}
}
$type or internal_error("unknown device $_");
($type, $major, $minor);
}
sub make($) {
local $_ = my $file = $_[0];
if (m!^(.*/dev)/(.*)!) {
$_ = $2;
} else {
$file =~ m|^/| && -e $file or $file = "/dev/$_";
}
-e $file and return $file; #- assume nobody takes fun at creating files named as device
my ($type, $major, $minor) = entry($_);
#- make a directory for this inode if needed.
mkdir_p(dirname($file));
syscall_('mknod', $file, $type | 0600, makedev($major, $minor)) or do {
die "mknod failed (dev $_): $!" if ! -e $file; # we may have raced with udev
};
$file;
}
sub simple_partition_scan {
my ($part) = @_;
$part->{device} =~ /([hsv]d[a-z])(\d+)$/;
}
sub part_number {
my ($part) = @_;
(simple_partition_scan($part))[1];
}
sub part_prefix {
my ($part) = @_;
(simple_partition_scan($part))[0];
}
sub prefix_for_dev {
my ($dev) = @_;
$dev . ($dev =~ /\d$/ || $dev =~ m!mapper/! ? 'p' : '');
}
sub should_prefer_UUID {
my ($dev) = @_;
$dev =~ /^([hsv]d)/;
}
sub symlink_now_and_register {
my ($if_struct, $of) = @_;
my $if = $if_struct->{device};
#- add a static udev device node, we can't do it with a udev rule,
#- eg, ttySL0 is a symlink created by a daemon
symlinkf($if, "$::prefix/lib/udev/devices/$of");
symlinkf($if, "$::prefix/dev/$of");
}
1;
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