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package devices;
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', list_modules::category2modules('various/crypto')) };
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, $file;
}
undef;
}
sub init_device_mapper() {
require modules;
eval { modules::load('dm-mod') };
}
sub entry {
my ($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 + ($4 || 0);
} elsif (my ($prefix, $nb) = /(.*?)(\d+)$/) {
my $f = ${{
"md" => sub { c::S_IFBLK(), 9, 0 },
"ubd/" => sub { c::S_IFBLK(), 98, 0 },
}}{$prefix};
if ($f) {
($type, $major, $minor) = $f->();
$minor += $nb;
}
}
unless ($type) {
($type, $major, $minor) =
@{ ${{
"atibm" => [ c::S_IFCHR(), 10, 3 ],
}}{$_} || [] };
}
# 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) = @_;
$part->{device} =~ /((?:[hsv]|xv)d[a-z]|mmcblk\d+p)(\d+)$/;
}
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$/ 'p' : '');
}
sub should_prefer_UUID {
my ($dev) = @_;
$dev =~ /^((?:[hsv]|xv)d)/;
}
sub symlink_now_and_register {
my ($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, "$::prefix/usr/lib/udev/devices/$of");
symlinkf($if, "/dev/$of");
}
1;
|
