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# raid-lib.pl
# Functions for managing RAID
BEGIN { push(@INC, ".."); };
use WebminCore;
&init_config();
&foreign_require("fdisk");
open(MODE, "$module_config_directory/mode");
chop($raid_mode = <MODE>);
close(MODE);
%container = ( 'raiddev', 1,
'device', 1 );
# get_raid_levels()
# Returns a list of allowed RAID levels
sub get_raid_levels
{
if ($raid_mode eq "mdadm") {
return ( 0, 1, 4, 5, 6, 10 );
}
else {
return ( 0, 1, 4, 5 );
}
}
# get_mdstat()
# Read information about active RAID devices. Returns a hash indexed by
# device name (like /dev/md0), with each value being an array reference
# containing status level disks blocks resync disk-info
sub get_mdstat
{
# Read the mdstat file
local %mdstat;
local $lastdev;
open(MDSTAT, $config{'mdstat'});
while(<MDSTAT>) {
if (/^(md\d+)\s*:\s+(\S+)\s+(\S+)\s+(.*)\s+(\d+)\s+blocks\s*(.*)resync=(\d+)/) {
$mdstat{$lastdev = "/dev/$1"} = [ $2, $3, $4, $5, $7, $6 ];
}
elsif (/^(md\d+)\s*:\s+(\S+)\s+(\S+)\s+(.*)\s+(\d+)\s+blocks\s*(.*)/) {
$mdstat{$lastdev = "/dev/$1"} = [ $2, $3, $4, $5, undef, $6 ];
}
elsif (/^(md\d+)\s*:\s+(\S+)\s+(\S+)\s+(.*)/) {
$mdstat{$lastdev = "/dev/$1"} = [ $2, $3, $4 ];
$_ = <MDSTAT>;
if (/\s+(\d+)\s+blocks\s*(.*)resync=(\d+)/) {
$mdstat{$lastdev}->[3] = $1;
$mdstat{$lastdev}->[4] = $3;
$mdstat{$lastdev}->[5] = $2;
}
elsif (/\s+(\d+)\s+blocks\s*(.*)/) {
$mdstat{$lastdev}->[3] = $1;
$mdstat{$lastdev}->[5] = $2;
}
}
}
close(MDSTAT);
return %mdstat;
}
# get_raidtab()
# Parse the raid config file into a list of devices
sub get_raidtab
{
local ($raiddev, $device, %mdstat);
return \@get_raidtab_cache if (scalar(@get_raidtab_cache));
%mdstat = &get_mdstat();
if ($raid_mode eq "raidtools") {
# Read the raidtab file
local $lnum = 0;
open(RAID, $config{'raidtab'});
while(<RAID>) {
s/\r|\n//g;
s/#.*$//;
if (/^\s*(\S+)\s+(\S+)/) {
local $dir = { 'name' => lc($1),
'value' => $2,
'line' => $lnum,
'eline' => $lnum };
if ($dir->{'name'} =~ /^(raid|spare|parity|failed)-disk$/) {
push(@{$device->{'members'}}, $dir);
$device->{'eline'} = $lnum;
$raiddev->{'eline'} = $lnum;
}
elsif ($dir->{'name'} eq 'raiddev') {
$dir->{'index'} = scalar(@get_raidtab_cache);
push(@get_raidtab_cache, $dir);
}
else {
push(@{$raiddev->{'members'}}, $dir);
$raiddev->{'eline'} = $lnum;
}
if ($dir->{'name'} eq 'device') {
$device = $dir;
}
elsif ($dir->{'name'} eq 'raiddev') {
$raiddev = $dir;
local $m = $mdstat{$dir->{'value'}};
$dir->{'active'} = $m->[0] =~ /^active/;
$dir->{'level'} = $m->[1] =~ /raid(\d+)/ ? $1 : $m->[1];
$dir->{'devices'} = [
map { /(\S+)\[\d+\](\((.)\))?/;
$3 eq 'F' ? () : ("/dev/$1") }
split(/\s+/, $m->[2]) ];
$dir->{'size'} = $m->[3];
$dir->{'resync'} = $m->[4];
$dir->{'errors'} = &disk_errors($m->[5]);
}
}
$lnum++;
}
close(RAID);
}
else {
# Fake up the same format from mdadm output
local $m;
foreach $m (sort { $a cmp $b } keys %mdstat) {
local $md = { 'value' => $m,
'members' => [ ],
'index' => scalar(@get_raidtab_cache) };
local $mdstat = $mdstat{$md->{'value'}};
$md->{'active'} = $mdstat->[0] =~ /^active/;
$md->{'level'} = $mdstat->[1] =~ /raid(\d+)/ ? $1 : $mdstat->[1];
$md->{'devices'} = [
map { /(\S+)\[\d+\](\((.)\))?/;
$3 eq 'F' ? () : (&convert_to_hd("/dev/$1")) }
split(/\s+/, $mdstat->[2]) ];
$md->{'size'} = $mdstat->[3];
$md->{'resync'} = $mdstat->[4];
$md->{'errors'} = &disk_errors($mdstat->[5]);
open(MDSTAT, "mdadm --detail $m |");
while(<MDSTAT>) {
if (/^\s*Raid\s+Level\s*:\s*(\S+)/) {
local $lvl = $1;
$lvl =~ s/^raid//;
push(@{$md->{'members'}}, { 'name' => 'raid-level',
'value' => $lvl });
}
elsif (/^\s*Persistence\s*:\s*(.*)/) {
push(@{$md->{'members'}},
{ 'name' => 'persistent-superblock',
'value' => $1 =~ /is\s+persistent/ });
}
elsif (/^\s*State\s*:\s*(.*)/) {
$md->{'state'} = $1;
}
elsif ((/^\s*Rebuild\s+Status\s*:\s*([0-9\.]+)\s*\%/) || (/^\s*Reshape\s+Status\s*:\s*(\d+)\s*\%/)) {
$md->{'rebuild'} = $1;
}
elsif (/^\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+|\-)\s+(.*\S)\s+(\/\S+)/) {
# A device line
local $device = { 'name' => 'device',
'value' => $6,
'members' => [ ] };
push(@{$device->{'members'}},
{ 'name' => $5 eq 'spare' ? 'spare-disk'
: 'raid-disk',
'value' => $3 });
push(@{$md->{'members'}}, $device);
}
elsif (/^\s+(Chunk\s+Size|Rounding)\s+:\s+(\d+)/i) {
push(@{$md->{'members'}},
{ 'name' => 'chunk-size',
'value' => $2 });
}
}
close(MDSTAT);
open(MDSTAT, $config{'mdstat'});
while(<MDSTAT>){
if (/^.*finish=(\S+)min/){
$md->{'remain'} = $1;
}
if (/^.*speed=(\S+)K/){
$md->{'speed'} = $1;
}
}
close(MDSTAT);
push(@get_raidtab_cache, $md);
}
# Merge in info from mdadm.conf
local $lref = &read_file_lines($config{'mdadm'});
foreach my $l (@$lref) {
if ($l =~ /^ARRAY\s+(\S+)\s*(.*)/) {
local $dev = $1;
local %opts = map { split(/=/, $_, 2) }
split(/\s+/, $2);
local ($md) = grep { $_->{'value'} eq $dev }
@get_raidtab_cache;
if ($md) {
push(@{$md->{'members'}},
{ 'name' => 'spare-group',
'value' => $opts{'spare-group'} });
}
}
}
}
return \@get_raidtab_cache;
}
# disk_errors(string)
# Converts an mdstat errors string into an array of disk statuses
sub disk_errors
{
if ($_[0] =~ /\[([0-9\/]+)\].*\[([A-Z_]+)\]/i) {
local ($idxs, $errs) = ($1, $2);
local @idxs = split(/\//, $idxs);
local @errs = split(//, $errs);
#if (@idxs == @errs) {
# return [ map { $errs[$_-1] } @idxs ];
# }
return \@errs;
}
return undef;
}
sub lock_raid_files
{
&lock_file($raid_mode eq "raidtools" ? $config{'raidtab'} : $config{'mdadm'});
}
sub unlock_raid_files
{
&unlock_file($raid_mode eq "raidtools" ? $config{'raidtab'} : $config{'mdadm'});
}
# create_raid(&raid)
# Create a new raid set in the configuration file
sub create_raid
{
if ($raid_mode eq "raidtools") {
# Add to /etc/raidtab
local $lref = &read_file_lines($config{'raidtab'});
$_[0]->{'line'} = @$lref;
push(@$lref, &directive_lines($_[0]));
$_[0]->{'eline'} = @$lref - 1;
&flush_file_lines();
}
else {
# Add to /etc/mdadm.conf
local ($d, @devices);
foreach $d (&find("device", $_[0]->{'members'})) {
push(@devices, $d->{'value'});
}
local $sg = &find_value("spare-group", $_[0]->{'members'});
local $lref = &read_file_lines($config{'mdadm'});
local $lvl = &find_value('raid-level', $_[0]->{'members'});
$lvl = $lvl =~ /^\d+$/ ? "raid$lvl" : $lvl;
push(@$lref, "DEVICE ".
join(" ", map { &device_to_volid($_) } @devices));
push(@$lref, "ARRAY $_[0]->{'value'} level=$lvl devices=".
join(",", @devices).
($sg ? " spare-group=$sg" : ""));
&flush_file_lines();
&update_initramfs();
}
}
# delete_raid(&raid)
# Delete a raid set from the config file
sub delete_raid
{
if ($raid_mode eq "raidtools") {
# Remove from /etc/raidtab
local $lref = &read_file_lines($config{'raidtab'});
splice(@$lref, $_[0]->{'line'}, $_[0]->{'eline'} - $_[0]->{'line'} + 1);
&flush_file_lines($config{'raidtab'});
}
else {
# Zero out the RAID
&system_logged("mdadm --zero-superblock ".
"$_[0]->{'value'} >/dev/null 2>&1");
# Zero out component superblocks
my @devs = &find('device', $_[0]->{'members'});
foreach $d (@devs) {
if (&find('raid-disk', $d->{'members'}) ||
&find('parity-disk', $d->{'members'}) ||
&find('spare-disk', $d->{'members'})) {
&system_logged("mdadm --zero-superblock ".
"$d->{'value'} >/dev/null 2>&1");
}
}
# Remove from /etc/mdadm.conf
local ($d, %devices);
foreach $d (&find("device", $_[0]->{'members'})) {
$devices{$d->{'value'}} = 1;
}
local $lref = &read_file_lines($config{'mdadm'});
local $i;
for($i=0; $i<@$lref; $i++) {
if ($lref->[$i] =~ /^ARRAY\s+(\S+)/ && $1 eq $_[0]->{'value'}) {
splice(@$lref, $i--, 1);
}
elsif ($lref->[$i] =~ /^DEVICE\s+(.*)/) {
local @olddevices = split(/\s+/, $1);
local @newdevices = grep { !$devices{$_} } @olddevices;
if (@newdevices) {
$lref->[$i] = "DEVICE ".join(" ", @newdevices);
}
else {
splice(@$lref, $i--, 1);
}
}
}
&flush_file_lines($config{'mdadm'});
&update_initramfs();
}
}
# device_to_volid(device)
# Given a device name like /dev/sda1, convert it to a volume ID if possible.
# Otherwise return the device name.
sub device_to_volid
{
local ($dev) = @_;
return $dev;
#return &fdisk::get_volid($dev) || $dev;
}
# make_raid(&raid, force, [missing], [assume-clean])
# Call mkraid or mdadm to make a raid set for real
sub make_raid
{
if (!-r $_[0]->{'value'} && $_[0]->{'value'} =~ /\/md(\d+)$/) {
# Device file is missing - create it now
&system_logged("mknod $_[0]->{'value'} b 9 $1");
}
if ($raid_mode eq "raidtools") {
# Call the raidtools mkraid command
local $f = $_[1] ? "--really-force" : "";
local $out = &backquote_logged("mkraid $f $_[0]->{'value'} ".
"2>&1 </dev/null");
return $? ? &text($out =~ /force/i ? 'eforce' : 'emkraid',
"<pre>$out</pre>")
: undef;
}
else {
# Call the complete mdadm command
local $lvl = &find_value("raid-level", $_[0]->{'members'});
$lvl =~ s/^raid//;
local $chunk = &find_value("chunk-size", $_[0]->{'members'});
local $mode = &find_value("persistent-superblock", $_[0]->{'members'}) ? "create" : "build";
local $layout = &find_value("parity-algorithm", $_[0]->{'members'});
local ($d, @devices, @spares, @parities);
foreach $d (&find("device", $_[0]->{'members'})) {
if (&find("raid-disk", $d->{'members'})) {
push(@devices, $d->{'value'});
}
elsif (&find("spare-disk", $d->{'members'})) {
push(@spares, $d->{'value'});
}
elsif (&find("parity-disk", $d->{'members'})) {
push(@parities, $d->{'value'});
}
}
local $cmd = "mdadm --$mode --level $lvl --chunk $chunk";
if ($_[2]) {
push(@devices, "missing");
}
$cmd .= " --layout $layout" if ($layout);
$cmd .= " --raid-devices ".scalar(@devices);
$cmd .= " --spare-devices ".scalar(@spares) if (@spares);
$cmd .= " --force" if ($_[1]);
$cmd .= " --assume-clean" if ($_[3]);
$cmd .= " --run";
$cmd .= " $_[0]->{'value'}";
foreach $d (@devices, @parities, @spares) {
$cmd .= " $d";
}
local $out = &backquote_logged("$cmd 2>&1 </dev/null");
return $? ? &text('emdadmcreate', "<pre>$out</pre>") : undef;
}
}
# readwrite_raid(&raid)
# Set RAID mode to read/write.
sub readwrite_raid
{
local $cmd = "mdadm --readwrite $_[0]->{'value'}";
local $out = &backquote_logged("$cmd 2>&1 </dev/null");
return;
}
# unmake_raid(&raid)
# Shut down a RAID set permanently
sub unmake_raid
{
if ($raid_mode eq "raidtools") {
&deactivate_raid($_[0]) if ($_[0]->{'active'});
}
else {
local $out = &backquote_logged("mdadm --stop $_[0]->{'value'} 2>&1");
&error(&text('emdadmstop', "<tt>$out</tt>")) if ($?);
}
}
# activate_raid(&raid)
# Activate a raid set, which has previously been deactivated
sub activate_raid
{
if ($raid_mode eq "raidtools") {
local $out = &backquote_logged("raidstart $_[0]->{'value'} 2>&1");
&error(&text('eraidstart', "<tt>$out</tt>")) if ($?);
}
}
# deactivate_raid(&raid)
# Deactivate a raid set, without actually deleting it
sub deactivate_raid
{
if ($raid_mode eq "raidtools") {
# Just stop the raid set
local $out = &backquote_logged("raidstop $_[0]->{'value'} 2>&1");
&error(&text('eraidstop', "<tt>$out</tt>")) if ($?);
}
}
# add_partition(&raid, device)
# Adds a device to some RAID set, both in the config file and for real
sub add_partition
{
if ($raid_mode eq "mdadm") {
# Call mdadm command to add
local $out = &backquote_logged(
"mdadm --manage $_[0]->{'value'} --add $_[1] 2>&1");
&error(&text('emdadmadd', "<tt>$out</tt>")) if ($?);
# Add device to mdadm.conf
local $lref = &read_file_lines($config{'mdadm'});
local ($i, $done_device);
for($i=0; $i<@$lref; $i++) {
if ($lref->[$i] =~ /^DEVICE\s+/ && !$done_device) {
$lref->[$i] .= " $_[1]";
$done_device++;
}
elsif ($lref->[$i] =~ /^ARRAY\s+(\S+)/ &&
$1 eq $_[0]->{'value'}) {
$lref->[$i] =~ s/(\s)devices=(\S+)/${1}devices=${2},$_[1]/;
}
}
&flush_file_lines();
&update_initramfs();
}
}
# grow(&raid, totaldisks)
# Grows a RAID set to contain totaldisks active partitions
sub grow
{
if ($raid_mode eq "mdadm") {
# Call mdadm command to add
$cmd="mdadm --grow $_[0]->{'value'} -n $_[1] 2>&1";
local $out = &backquote_logged(
$cmd);
&error(&text('emdadmgrow', "<tt>'$cmd' -> $out</tt>")) if ($?);
}
}
# convert_raid(&raid, oldcount, newcount, level)
# Converts a RAID set to a defferent level RAID set
sub convert_raid
{
if ($raid_mode eq "mdadm") {
if ($_[2]) {
# Call mdadm command to convert
$cmd="mdadm --grow $_[0]->{'value'} --level $_[3]";
$grow_by = $_[2] - $_[1];
if ($grow_by == 1) {
$raid_device_short = $_[0]->{'value'};
$raid_device_short =~ s/\/dev\///;
$date = `date \+\%Y\%m\%d-\%H\%M`;
chomp($date);
$cmd .= " --backup-file /tmp/convert-$raid_device_short-$date";
}
$cmd .= " -n $_[2] 2>&1";
local $out = &backquote_logged(
$cmd);
&error(&text('emdadmgrow', "<tt>'$cmd' -> $out</tt>")) if ($?);
}
else {
$newcount = $_[1] - 1;
$cmd="mdadm --grow $_[0]->{'value'} --level $_[3] -n $newcount";
$raid_device_short = $_[0]->{'value'};
$raid_device_short =~ s/\/dev\///;
$date = `date \+\%Y\%m\%d-\%H\%M`;
chomp($date);
$cmd .= " --backup-file /tmp/convert-$raid_device_short-$date";
local $out = &backquote_logged(
$cmd);
&error(&text('emdadmgrow', "<tt>'$cmd' -> $out</tt>")) if ($?);
}
}
}
# remove_partition(&raid, device)
# Removes a device from some RAID set, both in the config file and for real
sub remove_partition
{
if ($raid_mode eq "mdadm") {
# Call mdadm commands to fail and remove
local $out = &backquote_logged(
"mdadm --manage $_[0]->{'value'} --fail $_[1] 2>&1");
&error(&text('emdadfail', "<tt>$out</tt>")) if ($?);
local $out = &backquote_logged(
"mdadm --manage $_[0]->{'value'} --remove $_[1] 2>&1");
&error(&text('emdadremove', "<tt>$out</tt>")) if ($?);
# Remove device from mdadm.conf
local $lref = &read_file_lines($config{'mdadm'});
local ($i, $done_device);
for($i=0; $i<@$lref; $i++) {
if ($lref->[$i] =~ /^DEVICE\s+(.*)/) {
local @olddevices = split(/\s+/, $1);
local @newdevices = grep { $_ ne $_[1] } @olddevices;
if (@newdevices) {
$lref->[$i] = "DEVICE ".join(" ", @newdevices);
}
else {
splice(@$lref, $i--, 1);
}
}
elsif ($lref->[$i] =~ /^ARRAY\s+(\S+)/ &&
$1 eq $_[0]->{'value'}) {
$lref->[$i] =~ s/((=)|,)\Q$_[1]\E/$2/;
}
}
&flush_file_lines();
&update_initramfs();
}
}
# remove_detached(&raid)
# Removes detached device(s) from some RAID set
sub remove_detached
{
if ($raid_mode eq "mdadm") {
# Call mdadm commands to remove
local $out = &backquote_logged(
"mdadm --manage $_[0]->{'value'} --remove detached 2>&1");
&error(&text('emdadremove', "<tt>$out</tt>")) if ($?);
}
}
# directive_lines(&directive, indent)
sub directive_lines
{
local @rv = ( "$_[1]$_[0]->{'name'}\t$_[0]->{'value'}" );
foreach $m (@{$_[0]->{'members'}}) {
push(@rv, &directive_lines($m, $_[1]."\t"));
}
return @rv;
}
# find(name, &array)
sub find
{
local($c, @rv);
foreach $c (@{$_[1]}) {
if ($c->{'name'} eq $_[0]) {
push(@rv, $c);
}
}
return @rv ? wantarray ? @rv : $rv[0]
: wantarray ? () : undef;
}
# find_value(name, &array)
sub find_value
{
local(@v);
@v = &find($_[0], $_[1]);
if (!@v) { return undef; }
elsif (wantarray) { return map { $_->{'value'} } @v; }
else { return $v[0]->{'value'}; }
}
# device_status(device)
# Returns an array of directory, type, mounted
sub device_status
{
return &fdisk::device_status($_[0]);
}
# find_free_partitions(&skip, showtype, showsize)
# Returns a list of options, suitable for ui_select
sub find_free_partitions
{
&foreign_require("fdisk");
&foreign_require("mount");
&foreign_require("lvm");
local %skip = map { $_, 1 } @{$_[0]};
local %used;
local $c;
local $conf = &get_raidtab();
foreach $c (@$conf) {
foreach $d (&find_value('device', $c->{'members'})) {
$used{$d}++;
}
}
local @disks;
local $d;
foreach $d (&fdisk::list_disks_partitions()) {
foreach $p (@{$d->{'parts'}}) {
next if ($used{$p->{'device'}} || $p->{'extended'} ||
$skip{$p->{'device'}});
local @st = &device_status($p->{'device'});
next if (@st);
$tag = $p->{'type'} ? &fdisk::tag_name($p->{'type'}) : undef;
$p->{'blocks'} =~ s/\+$//;
push(@disks, [ $p->{'device'},
$p->{'desc'}.
($tag && $_[1] ? " ($tag)" : "").
(!$_[2] ? "" :
$d->{'cylsize'} ? " (".&nice_size($d->{'cylsize'}*($p->{'end'} - $p->{'start'} + 1)).")" :
" ($p->{'blocks'} $text{'blocks'})") ]);
}
if (!@{$d->{'parts'}} &&
!$used{$d->{'device'}} && !$skip{$d->{'device'}}) {
# Raw disk has no partitions - add it as an option
push(@disks, [ $d->{'device'},
$d->{'desc'}.
($d->{'cylsize'} ? " (".&nice_size($d->{'cylsize'}*$d->{'cylinders'}).")" : "") ]);
}
}
foreach $c (@$conf) {
next if (!$c->{'active'} || $used{$c->{'value'}});
local @st = &device_status($c->{'value'});
next if (@st || $skip{$c->{'value'}});
push(@disks, [ $c->{'value'},
&text('create_rdev',
$c->{'value'} =~ /md(\d+)$/ ? "$1" : $c->{'value'}) ]);
}
local $vg;
foreach $vg (&lvm::list_volume_groups()) {
local $lv;
foreach $lv (&lvm::list_logical_volumes($vg->{'name'})) {
next if ($lv->{'perm'} ne 'rw' || $used{$lv->{'device'}} ||
$skip->{$lv->{'device'}});
local @st = &device_status($lv->{'device'});
next if (@st);
push(@disks, [ $lv->{'device'},
&text('create_lvm', $lv->{'vg'}, $lv->{'name'}) ]);
}
}
return sort { $a->[0] cmp $b->[0] } @disks;
}
# convert_to_hd(device)
# Converts a device file like /dev/ide/host0/bus0/target1/lun0/part1 to
# /dev/hdb1, if it doesn't actually exist.
sub convert_to_hd
{
local ($dev) = @_;
return $dev if (-r $dev);
if ($dev =~ /ide\/host(\d+)\/bus(\d+)\/target(\d+)\/lun(\d+)\/part(\d+)/) {
local ($host, $bus, $target, $lun, $part) = ($1, $2, $3, $4, $5);
return "/dev/".&fdisk::hbt_to_device($host, $bus, $target).$part;
}
else {
return $dev;
}
}
%mdadm_notification_opts = map { $_, 1 } ( 'MAILADDR', 'MAILFROM', 'PROGRAM' );
# get_mdadm_notifications()
# Returns a hash from mdadm.conf notification-related settings to values
sub get_mdadm_notifications
{
local $lref = &read_file_lines($config{'mdadm'});
local %rv;
foreach my $l (@$lref) {
$l =~ s/#.*$//;
if ($l =~ /^(\S+)\s+(\S.*)/ && $mdadm_notification_opts{$1}) {
$rv{$1} = $2;
}
}
return \%rv;
}
# save_mdadm_notifications(¬ifications)
# Updates mdadm.conf with settings from the given hash. Those set to undef
# are removed from the file.
sub save_mdadm_notifications
{
local ($notif) = @_;
local $lref = &read_file_lines($config{'mdadm'});
local %done;
for(my $i=0; $i<@$lref; $i++) {
my $l = $lref->[$i];
$l =~ s/#.*$//;
local ($k, $v) = split(/\s+/, $l, 2);
if (exists($notif->{$k})) {
if (defined($notif->{$k})) {
$lref->[$i] = "$k $notif->{$k}";
}
else {
splice(@$lref, $i--, 1);
}
$done{$k}++;
}
}
foreach my $k (grep { !$done{$_} && defined($notif->{$_}) } keys %$notif) {
push(@$lref, "$k $notif->{$k}");
}
&flush_file_lines($config{'mdadm'});
}
# get_mdadm_action()
# Returns the name of an init module action for mdadm monitoring, or undef if
# not supported.
sub get_mdadm_action
{
if (&foreign_installed("init")) {
&foreign_require("init");
foreach my $a ("mdmonitor", "mdadm", "mdadmd") {
local $st = &init::action_status($a);
return $a if ($st);
}
}
return undef;
}
# get_mdadm_monitoring()
# Returns 1 if mdadm monitoring is enabled, 0 if not
sub get_mdadm_monitoring
{
local $act = &get_mdadm_action();
if ($act) {
&foreign_require("init");
local $st = &init::action_status($act);
return $st == 2;
}
return 0;
}
# save_mdadm_monitoring(enabled)
# Tries to enable or disable mdadm monitoring. Returns an error mesage
# if something goes wrong, undef on success
sub save_mdadm_monitoring
{
local ($enabled) = @_;
local $act = &get_mdadm_action();
if ($act) {
&foreign_require("init");
if ($enabled) {
&init::enable_at_boot($act);
&init::stop_action($act);
sleep(2);
local ($ok, $err) = &init::start_action($act);
return $err if (!$ok);
}
else {
&init::disable_at_boot($act);
&init::stop_action($act);
}
}
return undef;
}
# update_initramfs()
# If the update-initramfs command is installed, run it to update mdadm.conf
# in the ramdisk
sub update_initramfs
{
if (&has_command("update-initramfs")) {
&system_logged("update-initramfs -u >/dev/null 2>&1 </dev/null");
}
}
# get_mdadm_version()
# Returns the mdadm version number
sub get_mdadm_version
{
local $out = `mdadm --version 2>&1`;
local $ver = $out =~ /\s+v([0-9\.]+)/ ? $1 : undef;
return wantarray ? ( $ver, $out ) : $ver;
}
1;
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