xcat-core/xCAT-server/share/xcat/cons/kvm

#!/usr/bin/env perl
# IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
use Fcntl qw(:DEFAULT :flock);

sub get_lock {
    unless (flock(LOCKHANDLE, LOCK_EX | LOCK_NB)) {
        $| = 1;
        print "Acquiring startup lock...";
        flock(LOCKHANDLE, LOCK_EX) or die "Fatal error securing startup lock";
        print "done\n";
    }
    truncate(LOCKHANDLE, 0);
    print LOCKHANDLE $$ . "\n";
}

sub release_lock {
    truncate(LOCKHANDLE, 0);
    flock(LOCKHANDLE, LOCK_UN);
}

BEGIN
{
    use Time::HiRes qw(sleep);
    use File::Path;
    use Fcntl qw(:DEFAULT :flock);
    $::XCATROOT = $ENV{'XCATROOT'} ? $ENV{'XCATROOT'} : '/opt/xcat';
    umask 0077;
    mkpath("/tmp/xcat/");
    unless (sysopen(LOCKHANDLE, "/tmp/xcat/consolelock", O_WRONLY | O_CREAT)) {
        sleep 15;
        print "Unable to open lock file";
        exit 0;
    }
    get_lock();

}

my $sleepint;
use lib "$::XCATROOT/lib/perl";
require xCAT::Client;

require File::Basename;
import File::Basename;
my $scriptname = $0;

my $cmdref = {
    command   => ["getcons"],
    arg       => ["text"],
    noderange => [ $ARGV[0] ]
};
use Data::Dumper;
my $dsthost;
my $dstty;
my $speed;

sub getans {
    my $rsp = shift;
    if ($rsp->{node}) {
        $dsthost = $rsp->{node}->[0]->{sshhost}->[0];
        $dstty   = $rsp->{node}->[0]->{psuedotty}->[0];
        $speed   = $rsp->{node}->[0]->{baudrate}->[0];
    }
}
xCAT::Client::submit_request($cmdref, \&getans);
until ($dsthost and $speed and $dstty) {
    release_lock();
    $sleepint = int(rand(30)) + 60;
    print "Console not ready, retrying in $sleepint seconds (Ctrl-C to skip delay)\n";
    exec "sleep $sleepint";
}
release_lock();

# The screen command needs the TERM env var,
# TERM might be empty for some unknown reasons,
# for example, on SLES 12 and on PowerKVM
if (!$ENV{'TERM'}) {
    $ENV{'TERM'} = "vt100";
}

exec "ssh -t $dsthost screen -U -a -O -e ^]a -d -R -S serial-" . $ARGV[0] . "-cons -A $dstty $speed";