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#! /usr/bin/perl
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2010 Vyatta, Inc.
# All Rights Reserved.
#
# **** End License ****
# Update console configuration in /etc/inittab and grub
# based on Vyatta configuration
use strict;
use warnings;
use lib "/opt/vyatta/share/perl5";
use Vyatta::Config;
use File::Compare;
use File::Copy;
die "$0 expects no arguments\n" if (@ARGV);
# if file is unchanged, do nothing and return false
# otherwise update to new version
sub update {
my ($old, $new) = @_;
if ( compare($old, $new) != 0) {
move($new, $old)
or die "Can't move $new to $old";
return 1;
} else {
unlink($new);
return;
}
}
my $INITTAB = "/etc/inittab";
my $TMPTAB = "/tmp/inittab.$$";
sub update_inittab {
open (my $inittab, '<', $INITTAB)
or die "Can't open $INITTAB: $!";
open (my $tmp, '>', $TMPTAB)
or die "Can't open $TMPTAB: $!";
# Clone original inittab but remove all references to serial lines
print {$tmp} grep { ! /^T/ } <$inittab>;
close $inittab;
my $config = new Vyatta::Config;
$config->setLevel("system console device");
my $id = 0;
foreach my $tty ($config->listNodes()) {
my $speed = $config->returnValue("$tty speed");
$speed = 9600 unless $speed;
print {$tmp} "T$id:23:respawn:";
if ($config->exists("$tty modem")) {
printf {$tmp} "/sbin/mgetty -x0 -s %d %s\n", $speed, $tty;
} else {
printf {$tmp} "/sbin/getty -L %s %d vt100\n", $tty, $speed;
}
# Limit to 0-9 because of limitation of last char in id field
if (++$id >= 10) {
warn "Ignoring $tty only 10 serial devices supported\n";
last;
}
}
close $tmp;
if (update($INITTAB, $TMPTAB)) {
# This is same as telinit q - it tells init to re-examine inittab
kill 1, 1;
}
}
my $GRUBCFG = "/boot/grub/grub.cfg";
my $GRUBTMP = "/tmp/grub.cfg.$$";
# For existing serial line change speed (if necessary)
# Only applys to ttyS0
sub update_grub {
return unless (-f $GRUBCFG);
my $config = new Vyatta::Config;
$config->setLevel("system console device");
return unless $config->exists("ttyS0");
my $speed = $config->returnValue("ttyS0 speed");
$speed = "9600" unless defined($speed);
open (my $grub, '<', $GRUBCFG)
or die "Can't open $GRUBCFG: $!";
open (my $tmp, '>', $GRUBTMP)
or die "Can't open $GRUBTMP: $!";
while (<$grub>) {
if (/^serial / ) {
print {$tmp} "serial --unit=0 --speed=$speed\n";
} elsif (/^(.* console=ttyS0),[0-9]+ (.*)$/) {
print {$tmp} "$1,$speed $2\n";
} else {
print {$tmp} $_;
}
}
close $grub;
close $tmp;
update($GRUBCFG, $GRUBTMP);
}
update_inittab;
update_grub;
exit 0;
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