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package fs::wild_device; # $Id: wild_device.pm 268572 2010-05-11 16:42:46Z pterjan $
use diagnostics;
use strict;
use devices;
use common;
sub analyze {
my ($dev) = @_;
if ($dev =~ m!^/u?dev/(.*)!) {
'dev', $dev;
} elsif ($dev !~ m!^/! && (-e "/dev/$dev" || -e "/dev/$dev")) {
'dev', "/dev/$dev";
} elsif ($dev =~ /^LABEL=(.*)/) {
'label', $1;
} elsif ($dev =~ /^UUID=(.*)/) {
'uuid', $1;
} elsif ($dev eq 'none' || $dev eq 'rootfs') {
'virtual';
} elsif ($dev =~ m!^(\S+):/(\w|$)!) {
'nfs';
} elsif ($dev =~ m!^//\w!) {
'smb';
} elsif ($dev =~ m!^https?://!) {
'dav';
}
}
sub to_subpart {
my ($dev) = @_;
my $part = { device => $dev, faked_device => 1 }; #- default
if (my ($kind, $val) = analyze($dev)) {
if ($kind eq 'label') {
$part->{device_LABEL} = $val;
} elsif ($kind eq 'uuid') {
$part->{device_UUID} = $val;
} elsif ($kind eq 'dev') {
my %part = (faked_device => 0);
if (my $rdev = (stat "$dev")[6]) {
($part{major}, $part{minor}) = unmakedev($rdev);
}
my $symlink = $dev !~ m!mapper/! ? readlink("$dev") : undef;
$dev =~ s!/u?dev/!!;
if ($symlink && $symlink !~ m!^/!) {
my $keep = 1;
if ($symlink =~ m!/! || $dev =~ m!/!) {
$symlink = MDK::Common::File::concat_symlink("/dev/" . dirname($dev), $symlink);
$symlink =~ s!^/dev/!! or $keep = 0;
}
if ($keep) {
$part{device_LABEL} = $1 if $dev =~ m!^disk/by-label/(.*)!;
$part{device_UUID} = $1 if $dev =~ m!^disk/by-uuid/(.*)!;
$part{device_alias} = $dev;
$dev = $symlink;
}
}
if (my $part_number = devices::part_number(\%part)) {
$part{part_number} = $part_number;
}
$part{device} = $dev;
return \%part;
}
} else {
if ($dev =~ m!^/! && -f "$dev") {
#- it must be a loopback file or directory to bind
} else {
log::l("part_from_wild_device_name: unknown device $dev");
}
}
$part;
}
sub _prefer_device_UUID {
my ($part) = @_;
$part->{prefer_device_UUID} ||
!$::no_uuid_by_default && devices::should_prefer_UUID($part->{device});
}
sub from_part {
my ($prefix, $part) = @_;
if ($part->{prefer_device_LABEL}) {
'LABEL=' . $part->{device_LABEL};
} elsif ($part->{device_alias}) {
"/dev/$part->{device_alias}";
} elsif (!$part->{prefer_device} && $part->{device_UUID} && _prefer_device_UUID($part)) {
'UUID=' . $part->{device_UUID};
} else {
my $faked_device = exists $part->{faked_device} ?
$part->{faked_device} :
do {
#- in case $part has been created without using fs::wild_device::to_subpart()
my ($kind) = analyze($part->{device});
$kind ? $kind ne 'dev' : $part->{device} =~ m!^/!;
};
if ($faked_device) {
$part->{device};
} elsif ($part->{device} =~ m!^/dev/!) {
log::l("ERROR: i have a full device $part->{device}, this should not happen. use fs::wild_device::to_subpart() instead of creating bad part data-structures!");
$part->{device};
} else {
my $dev = "/dev/$part->{device}";
eval { devices::make("$prefix$dev") };
$dev;
}
}
}
1;
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