]> git.proxmox.com Git - pve-container.git/blame - src/lxc-pve-autodev-hook
Fix #918: add /dev/mapper symlinks for dm-* devices
[pve-container.git] / src / lxc-pve-autodev-hook
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1#!/usr/bin/perl
2
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3use strict;
4use warnings;
5
6exit 0 if $ENV{LXC_NAME} && $ENV{LXC_NAME} !~ /^\d+$/;
7
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8use File::Path;
9use File::Basename;
10
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11use PVE::Tools;
12
13my $vmid = $ENV{LXC_NAME};
14my $root = $ENV{LXC_ROOTFS_MOUNT};
15
16if (@ARGV != 3 || $ARGV[1] ne 'lxc' || $ARGV[2] ne 'autodev') {
17 die "invalid usage, this is an LXC autodev hook\n";
18}
19
20if ($vmid ne $ARGV[0]) {
21 die "got wrong name: $ARGV[0] while LXC_NAME=$vmid\n";
22}
23
24my $devlist_file = "/var/lib/lxc/$vmid/devices";
25
26open my $fd, '<', $devlist_file;
27if (!$fd) {
28 exit 0 if $!{ENOENT}; # If the list is empty the file might not exist.
29 die "failed to open device list: $!\n";
30}
31
32while (defined(my $line = <$fd>)) {
33 if ($line !~ m@^(b):(\d+):(\d+):/dev/(\S+)\s*$@) {
34 warn "invalid .pve-devices entry: $line\n";
35 }
36 my ($type, $major, $minor, $dev) = ($1, $2, $3, $4);
37
38 # Don't break out of $root/dev/
39 if ($dev =~ /\.\./) {
40 warn "skipping illegal device node entry: $dev\n";
41 next;
42 }
43
44 # Never expose /dev/loop-control
45 if ($major == 10 && $minor == 237) {
46 warn "skipping illegal device entry (loop-control) for: $dev\n";
47 next;
48 }
49
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50 my $rel_devpath = "/dev/$dev";
51 my $rel_dir = dirname($rel_devpath);
52 File::Path::mkpath("$root/$rel_dir");
53
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54 PVE::Tools::run_command(['mknod', '-m', '666', "$root/dev/$dev",
55 $type, $major, $minor]);
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56
57 if ($dev =~ /^dm-\d+$/) {
58 File::Path::mkpath("$root/dev/mapper");
59 my $mapped_name = PVE::Tools::file_get_contents("/sys/block/$dev/dm/name");
60 chomp $mapped_name;
61 symlink("/dev/$dev", "$root/dev/mapper/$mapped_name");
62 }
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63}
64close $fd;
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65
66exit 0;