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xcat-core/xCAT-server/lib/xcat/plugins/prescripts.pm

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Perl
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# IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
package xCAT_plugin::prescripts;
BEGIN
{
$::XCATROOT = $ENV{'XCATROOT'} ? $ENV{'XCATROOT'} : '/opt/xcat';
}
use lib "$::XCATROOT/lib/perl";
use strict;
require xCAT::Table;
require xCAT::Utils;
require xCAT::TableUtils;
require xCAT::ServiceNodeUtils;
require xCAT::MsgUtils;
use Getopt::Long;
use Sys::Hostname;
use Time::HiRes qw(gettimeofday sleep);
use POSIX "WNOHANG";
1;
#-------------------------------------------------------
=head3 handled_commands
Return list of commands handled by this plugin
=cut
#-------------------------------------------------------
sub handled_commands
{
return {
runbeginpre => "prescripts",
runendpre => "prescripts"
};
}
#-------------------------------------------------------
=head3 preprocess_request
Check and setup for hierarchy
=cut
#-------------------------------------------------------
sub preprocess_request
{
my $req = shift;
my $cb = shift;
#>>>>>>>used for trace log start>>>>>>>
my @args = ();
my %opt;
my $verbose_on_off = 0;
if (ref($req->{arg})) {
@args = @{ $req->{arg} };
} else {
@args = ($req->{arg});
}
@ARGV = @args;
GetOptions('V' => \$opt{V});
if ($opt{V}) { $verbose_on_off = 1; }
#>>>>>>>used for trace log end>>>>>>>
#if already preprocessed, go straight to request
if ($req->{_xcatpreprocessed}->[0] == 1) { return [$req]; }
my $req_nodes = $req->{node};
if (!$req_nodes) { return; }
my @nodes;
my $command = $req->{command}->[0];
my $column;
if ($command eq 'runbeginpre') { $column = 'begin'; }
elsif ($command eq 'runendpre') { $column = 'end'; }
else { $column = ''; }
# See if anything in the prescripts table for the nodes. If not, skip.
# Nothing to do.
my $tab = xCAT::Table->new('prescripts');
#first check if xcatdefaults entry
if ($tab->getAttribs({ node => "xcatdefaults" }, $column)) {
# yes - process all nodes
@nodes = @$req_nodes;
} else {
# no xcatdefaults, check for node entries
my $tabdata = $tab->getNodesAttribs($req_nodes, [ 'node', $column ]);
if ($tabdata) {
foreach my $node (@$req_nodes) {
if (($tabdata->{$node}) &&
($tabdata->{$node}->[0]) &&
($tabdata->{$node}->[0]->{$column})) {
push(@nodes, $node);
}
}
}
}
# if no nodes left to process, we are done
if (!@nodes) {
xCAT::MsgUtils->trace($verbose_on_off, "d", "prescripts->preprocess_request: no nodes left to process, we are done");
return;
}
my $service = "xcat";
@args = ();
if (ref($req->{arg})) {
@args = @{ $req->{arg} };
} else {
@args = ($req->{arg});
}
@ARGV = @args;
#print "prepscripts: preprocess_request get called, args=@args, nodes=@$nodes\n";
#>>>>>>>used for trace log>>>>>>
my $str_node = join(" ", @nodes);
my $str_args = join(" ", @args);
xCAT::MsgUtils->trace($verbose_on_off, "d", "prescripts->preprocess_request: get called, args='$str_args', nodes='$str_node'");
#use Getopt::Long;
Getopt::Long::Configure("bundling");
Getopt::Long::Configure("pass_through");
GetOptions('l' => \$::LOCAL);
my $sn = xCAT::ServiceNodeUtils->getSNformattedhash(\@nodes, $service, "MN");
my @requests;
if ($::LOCAL) { #only handle the local nodes
#print "process local nodes: @$nodes\n";
#get its own children only
my @hostinfo = xCAT::NetworkUtils->determinehostname();
my %iphash = ();
foreach (@hostinfo) { $iphash{$_} = 1; }
my @children = ();
foreach my $snkey (keys %$sn) {
if (exists($iphash{$snkey})) {
my $tmp = $sn->{$snkey};
@children = (@children, @$tmp);
}
}
if (@children > 0) {
my $reqcopy = {%$req};
$reqcopy->{node} = \@children;
$reqcopy->{'_xcatdest'} = $hostinfo[0];
$reqcopy->{_xcatpreprocessed}->[0] = 1;
push @requests, $reqcopy;
xCAT::MsgUtils->trace($verbose_on_off, "d", "prescripts: handle request in $hostinfo[0]");
return \@requests;
}
} else { #run on mn and need to dispatch the requests to the service nodes
#print "dispatch to sn\n";
# find service nodes for requested nodes
# build an individual request for each service node
# find out the names for the Management Node
foreach my $snkey (keys %$sn)
{
my $reqcopy = {%$req};
$reqcopy->{node} = $sn->{$snkey};
$reqcopy->{'_xcatdest'} = $snkey;
$reqcopy->{_xcatpreprocessed}->[0] = 1;
xCAT::MsgUtils->trace($verbose_on_off, "d", "prescripts: handle request in $snkey");
push @requests, $reqcopy;
} # end foreach
return \@requests;
}
return;
}
#-------------------------------------------------------
=head3 process_request
Process the command
=cut
#-------------------------------------------------------
sub process_request
{
my $request = shift;
my $callback = shift;
my $nodes = $request->{node};
my $command = $request->{command}->[0];
my $args = $request->{arg};
my $rsp = {};
if ($command eq "runbeginpre")
{
runbeginpre($nodes, $request, $callback);
}
else
{
if ($command eq "runendpre")
{
runendpre($nodes, $request, $callback)
}
else
{
my $rsp = {};
$rsp->{data}->[0] =
"Unknown command $command. Cannot process the command.";
xCAT::MsgUtils->message("E", $rsp, $callback, 1);
return;
}
}
}
#-------------------------------------------------------
=head3 runbeginpre
Runs all the begin scripts defined in prescripts.begin column for the give nodes.
=cut
#-------------------------------------------------------
sub runbeginpre
{
my ($nodes, $request, $callback) = @_;
my $args = $request->{arg};
my $action = $args->[0];
my $localhostname = hostname();
my $installdir = xCAT::TableUtils->getInstallDir();
my %script_hash = getprescripts($nodes, $action, "begin");
foreach my $scripts (keys %script_hash) {
my $runnodes = $script_hash{$scripts};
if ($runnodes && (@$runnodes > 0)) {
my $runnodes_s = join(',', @$runnodes);
#now run the scripts
my @script_array = split(',', $scripts);
foreach my $s (@script_array) {
my $rsp = {};
$rsp->{data}->[0] = "$localhostname: Running begin script $s for nodes $runnodes_s.";
$callback->($rsp);
#check if the script need to be invoked for each node in parallel.
#script must contian a line like this in order to be run this way: #xCAT setting: MAX_INSTANCE=4
#where 4 is the maximum instance at a time
my $max_instance = 0;
my $ret = `grep -E '#+xCAT setting: *MAX_INSTANCE=' $installdir/prescripts/$s`;
if ($? == 0) {
$max_instance = `echo "$ret" | cut -d= -f2`;
chomp($max_instance);
}
if ($max_instance > 0) {
#run the script for each node in paralell, no more than max_instance at a time
run_script_single_node($installdir, $s, $action, $max_instance, $runnodes, $callback);
} else {
undef $SIG{CHLD};
#pass all the nodes to the script, only invoke the script once
my $ret = `NODES=$runnodes_s ACTION=$action $installdir/prescripts/$s 2>&1`;
my $err_code = $? / 256;
if ($err_code != 0) {
my $rsp = {};
$rsp->{error}->[0] = "$localhostname: $s: return code=$err_code. Error message=$ret";
$callback->($rsp);
if ($err_code > 1) { return $err_code; }
} else {
if ($ret) {
my $rsp = {};
$rsp->{data}->[0] = "$localhostname: $s: $ret";
$callback->($rsp);
}
}
}
}
}
}
return;
}
#-------------------------------------------------------
=head3 runendpre
Runs all the begin scripts defined in prescripts.begin column for the give nodes.
=cut
#-------------------------------------------------------
sub runendpre
{
my ($nodes, $request, $callback) = @_;
my $args = $request->{arg};
my $action = $args->[0];
my $localhostname = hostname();
my $installdir = xCAT::TableUtils->getInstallDir();
my %script_hash = getprescripts($nodes, $action, "end");
foreach my $scripts (keys %script_hash) {
my $runnodes = $script_hash{$scripts};
if ($runnodes && (@$runnodes > 0)) {
my $runnodes_s = join(',', @$runnodes);
my %runnodes_hash = ();
#now run the scripts
my @script_array = split(',', $scripts);
foreach my $s (@script_array) {
my $rsp = {};
$rsp->{data}->[0] = "$localhostname: Running end script $s for nodes $runnodes_s.";
$callback->($rsp);
#check if the script need to be invoked for each node in parallel.
#script must contian a line like this in order to be run this way: #xCAT setting: MAX_INSTANCE=4
#where 4 is the maximum instance at a time
my $max_instance = 0;
my $ret = `grep -E '#+xCAT setting: *MAX_INSTANCE=' $installdir/prescripts/$s`;
if ($? == 0) {
$max_instance = `echo "$ret" | cut -d= -f2`;
chomp($max_instance);
}
if ($max_instance > 0) {
#run the script for each node in paralell, no more than max_instance at a time
run_script_single_node($installdir, $s, $action, $max_instance, $runnodes, $callback);
} else {
undef $SIG{CHLD};
my $ret = `NODES=$runnodes_s ACTION=$action $installdir/prescripts/$s 2>&1`;
my $err_code = $? / 256;
if ($err_code != 0) {
my $rsp = {};
$rsp->{error}->[0] = "$localhostname: $s: return code=$err_code. Error message=$ret";
$callback->($rsp);
if ($err_code > 1) { return $err_code; }
} else {
if ($ret) {
my $rsp = {};
$rsp->{data}->[0] = "$localhostname: $s: $ret";
$callback->($rsp);
}
}
}
}
}
}
return;
}
#-------------------------------------------------------
=head3 getprescripts
get the prescripts for the given nodes and actions
=cut
#-------------------------------------------------------
sub getprescripts
{
my ($nodes, $tmp_action, $colname) = @_;
my @action_a = split('=', $tmp_action);
my $action = $action_a[0];
my %ret = ();
if ($nodes && (@$nodes > 0)) {
my $tab = xCAT::Table->new('prescripts', -create => 1);
#first get xcatdefault column
my $et = $tab->getAttribs({ node => "xcatdefaults" }, $colname);
my $tmp_def = $et->{$colname};
my $defscripts;
if ($tmp_def) {
$defscripts = parseprescripts($tmp_def, $action);
}
#get scripts for the given nodes and
#add the scripts from xcatdefault in front of the other scripts
my $tabdata = $tab->getNodesAttribs($nodes, [ 'node', $colname ]);
foreach my $node (@$nodes) {
my $scripts_to_save = $defscripts;
my %lookup = (); #so that we do not have to parse the same scripts more than once
if ($tabdata && exists($tabdata->{$node})) {
my $tmp = $tabdata->{$node}->[0];
my $scripts = $tmp->{$colname};
if ($scripts) {
#parse the script. it is in the format of netboot:s1,s2|install:s3,s4 or just s1,s2
if (!exists($lookup{$scripts})) {
my $tmp_s = parseprescripts($scripts, $action);
$lookup{$scripts} = $tmp_s;
$scripts = $tmp_s;
} else {
$scripts = $lookup{$scripts};
}
#add the xcatdefaults
if ($scripts_to_save && $scripts) {
$scripts_to_save .= ",$scripts";
} else {
if ($scripts) { $scripts_to_save = $scripts; }
}
}
}
#save to the hash
if ($scripts_to_save) {
if (exists($ret{$scripts_to_save})) {
my $pa = $ret{$scripts_to_save};
push(@$pa, $node);
}
else {
$ret{$scripts_to_save} = [$node];
}
}
}
}
return %ret;
}
#-------------------------------------------------------
=head3 parseprescripts
Parse the prescript string and get the scripts for the given action out
=cut
#-------------------------------------------------------
sub parseprescripts
{
my $scripts = shift;
my $action = shift;
my $ret;
if ($scripts) {
foreach my $token (split(/\|/, $scripts)) {
if ($token =~ /:/) {
if ($token =~ /^$action:(.*)/) {
$ret .= "$1,";
}
} else {
$ret .= "$token,";
}
}
}
return $ret;
}
#-------------------------------------------------------
=head3 run_script_single_node
=cut
#-------------------------------------------------------
sub run_script_single_node
{
my $installdir = shift; #/install
my $s = shift; #script name
my $action = shift;
my $max = shift; #max number of instances to be run at a time
my $nodes = shift; #nodes to be run
my $callback = shift; #callback
my $children = 0;
my $localhostname = hostname();
foreach my $node (@$nodes) {
$SIG{CHLD} = sub { my $pid = 0; while (($pid = waitpid(-1, WNOHANG)) > 0) { $children--; } };
while ($children >= $max) {
Time::HiRes::sleep(0.5);
next;
}
my $pid = xCAT::Utils->xfork;
if (!defined($pid)) {
# Fork error
my $rsp = {};
$rsp->{data}->[0] = "$localhostname: Fork error before running script $s for node $node";
$callback->($rsp);
return 1;
}
elsif ($pid == 0) {
# Child process
undef $SIG{CHLD};
my $ret = `NODES=$node ACTION=$action $installdir/prescripts/$s 2>&1`;
my $err_code = $?;
my $rsp = {};
if ($err_code != 0) {
$rsp = {};
$rsp->{error}->[0] = "$localhostname: $s: node=$node. return code=$err_code. Error message=$ret";
$callback->($rsp);
} else {
if ($ret) {
$rsp->{data}->[0] = "$localhostname: $s: node=$node. $ret";
$callback->($rsp);
}
}
exit $err_code;
}
else {
# Parent process
$children++;
}
}
#drain one more time
while ($children > 0) {
Time::HiRes::sleep(0.5);
$SIG{CHLD} = sub { my $pid = 0; while (($pid = waitpid(-1, WNOHANG)) > 0) { $children--; } };
}
return 0;
}
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