summaryrefslogtreecommitdiffstats
path: root/perl-install/devices.pm
blob: be31387e321d30fc86785edd31e5869c75572282 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
package devices; # $Id$

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', arch() =~ /i.86/ ? 'aes-i586' : 'aes') };
	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 (/^sd(.)(\d{0,2})/) {
	$type = c::S_IFBLK();
	$major = 8;
	$minor = 16 * (ord($1) - ord('a')) + ($2 || 0);
    } elsif (/^hd(.)(\d{0,2})/) {
	$type = c::S_IFBLK();
	($major, $minor) =
	    @{ ${{'a' => [3, 0], 'b' => [3, 64],
		   'c' => [22,0], 'd' => [22,64],
		   'e' => [33,0], 'f' => [33,64],
		   'g' => [34,0], 'h' => [34,64],
		   'i' => [56,0], 'j' => [56,64],
		   'k' => [57,0], 'l' => [57,64],
                   'm' => [88,0], 'n' => [88,64],
                   'o' => [89,0], 'p' => [89,64],
                   'q' => [90,0], 'r' => [90,64],
                   's' => [91,0], 't' => [91,64],
	       }}{$1} or internal_error("unknown device $_") };
	$minor += $2 || 0;
    } 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} or internal_error("unknown device $prefix $nb");
	($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 ],
	       }}{$_} 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 die "mknod failed (dev $_): $!";

    $file;
}

sub simple_partition_scan {
    my ($part) = @_;
    $part->{device} =~ /([hs]d[a-z])(\d+)$/;
}
sub part_number {
    my ($part) = @_;
    (simple_partition_scan($part))[1];
}
sub part_prefix {
    my ($part) = @_;
    (simple_partition_scan($part))[0];
}

sub symlink_now_and_register {
    my ($if_struct, $of) = @_;
    my $if = $if_struct->{device};

    #- add a specific udev script, we can't do it with a udev rule,
    #- eg, ttySL0 is a symlink
    output_with_perm("$::prefix/etc/udev/conf.d/$of.conf", 0755, "ln -sf $if /dev/$of\n")
      if $of !~ /dvd|mouse/;

    symlinkf($if, "$::prefix/dev/$of");
}


1;