308 lines
11 KiB
Perl
Executable File
308 lines
11 KiB
Perl
Executable File
#!/usr/bin/perl
|
|
|
|
# Modify the grub config file on the node to boot the specified kernel and initrd.
|
|
# This script is meant to be run on the node via xdsh -e.
|
|
# Currently requires that dns on the mn be configured and working to resolve the short node names.
|
|
|
|
use strict;
|
|
use Getopt::Long;
|
|
use Data::Dumper;
|
|
use Socket;
|
|
|
|
# Globals - these are set once and then only read.
|
|
my $HELP;
|
|
my $VERBOSE;
|
|
my $WAITTIME;
|
|
my $PROVMETHOD;
|
|
my $XCATNETBOOTTITLE = 'xCAT network boot kernel and initrd';
|
|
|
|
my $usage = sub {
|
|
my $exitcode = shift @_;
|
|
print "Usage: modifygrub [-?|-h|--help] [-v|--verbose] [-w <waittime>] [-p <provmethod] <kernel-path> <initrd-path> <kernel-parms> <mn-ip>\n\n";
|
|
if (!$exitcode) {
|
|
print "Modify the grub config file on the node to boot the specified kernel and initrd.\n";
|
|
}
|
|
exit $exitcode;
|
|
};
|
|
|
|
if (-f '/etc/os-release') { die "This script doesn't support ubuntu yet.\n"; }
|
|
|
|
# Process the cmd line args
|
|
Getopt::Long::Configure("bundling");
|
|
#Getopt::Long::Configure("pass_through");
|
|
Getopt::Long::Configure("no_pass_through");
|
|
if (!GetOptions('h|?|help' => \$HELP, 'v|verbose' => \$VERBOSE, 'w|waittime=s' => \$WAITTIME, 'p|provmethod=s' => \$PROVMETHOD)) { $usage->(1); }
|
|
|
|
if ($HELP) { $usage->(0); }
|
|
if (scalar(@ARGV) != 4) { $usage->(1); }
|
|
if (!defined($WAITTIME)) { $WAITTIME = 60; } # seconds to wait after configuring the nic (to let the switch handle the state change)
|
|
my %args;
|
|
$args{kernelpath} = $ARGV[0];
|
|
$args{initrdpath} = $ARGV[1];
|
|
$args{kernelparms} = $ARGV[2];
|
|
$args{mnip} = $ARGV[3];
|
|
|
|
addKernelParms(\%args); # replace and add some parms to args{kernelparms}
|
|
updateGrub(\%args); # update the grub config with an entry filled with the info in args
|
|
|
|
exit(0);
|
|
|
|
|
|
# Add ip and net info to the kernel parms. Modifies the kernelparms value of the args hash passed in.
|
|
sub addKernelParms {
|
|
my $args = shift @_;
|
|
|
|
# replace '!myipfn!' with the mn ip
|
|
my $mnip = $args->{mnip};
|
|
$args->{kernelparms} =~ s/!myipfn!/$mnip/g;
|
|
|
|
# replace <nodename> with the nodename
|
|
my $nodename = $ENV{NODE}; # this env var is set by xdsh
|
|
$args->{kernelparms} =~ s/<nodename>/$nodename/g;
|
|
|
|
# get node ip and add it to the kernel parms
|
|
my ($nic, $ip, $netmask, $network, $broadcast, $gateway, $mac) = getNodeIpInfo($args);
|
|
if (!$ip) { die "Error: could not find the NIC that would connect to the xCAT mgmt node's IP (".$args->{mnip}.").\n"; }
|
|
# if we are booting genesis, need to add the BOOTIF parm
|
|
my $bootif;
|
|
if ($args->{kernelpath} =~ m/genesis\.kernel\.x86_64/) {
|
|
$bootif = $mac;
|
|
$bootif =~ s/:/-/g;
|
|
$bootif = "BOOTIF=01-$bootif";
|
|
}
|
|
|
|
if (defined($PROVMETHOD) && $PROVMETHOD eq 'sysclone') {
|
|
# add additional parms for sysclone
|
|
# DEVICE=eth0 IPADDR=10.0.0.99 NETMASK=255.255.255.0 NETWORK=10.0.0.0 BROADCAST=10.0.0.255 GATEWAY=10.0.0.1 GATEWAYDEV=eth0
|
|
#todo: should we also add ETHER_SLEEP=$WAITTIME textmode=1 dns=$mnip ?
|
|
$args->{kernelparms} .= " $bootif IPADDR=$ip NETMASK=$netmask NETWORK=$network BROADCAST=$broadcast GATEWAY=$gateway HOSTNAME=$nodename DEVICE=$nic GATEWAYDEV=$nic";
|
|
}
|
|
else { # scripted install or genesis shell
|
|
$args->{kernelparms} .= " $bootif hostip=$ip netmask=$netmask gateway=$gateway dns=$mnip hostname=$nodename netdevice=$nic netwait=$WAITTIME textmode=1";
|
|
}
|
|
}
|
|
|
|
|
|
# get this nodes nic, ip, netmask, gateway, and mac. Returns them in a 5 element array.
|
|
sub getNodeIpInfo {
|
|
my $args = shift @_;
|
|
my ($ipprefix) = $args->{mnip}=~m/^(\d+\.\d+)\./; #todo: this is a hack, just using the 1st 2 octets of the mn ip addr
|
|
verbose("using IP prefix $ipprefix");
|
|
|
|
# parse ip addr show output, looking for ipprefix, to determine nic and ip
|
|
my @output = runcmd("ip addr show");
|
|
my ($nic, $mac, $ipandmask);
|
|
foreach my $line (@output) {
|
|
my ($nictmp, $mactmp, $iptmp);
|
|
if (($nictmp) = $line=~m/^\d+:\s+(\S+): /) { $nic = $nictmp; } # new stanza, remember it
|
|
if (($mactmp) = $line=~m|^\s+link/ether\s+(\S+) |) { $mac = $mactmp; } # got mac, remember it
|
|
if (($iptmp) = $line=~m/^\s+inet\s+($ipprefix\S+) /) { $ipandmask = $iptmp; last; } # got ip, we are done
|
|
}
|
|
my ($ip, $netmask, $network, $broadcast) = convertIpAndMask($ipandmask);
|
|
|
|
# if the nic is a bonded nic (common on sl), then find the 1st real nic that is part of it
|
|
my $realnic = $nic;
|
|
if ($nic =~ /^bond/) {
|
|
my @nics = grep(m/\s+master\s+$nic\s+/, @output);
|
|
if (!scalar(@nics)) { die "Error: can't find the NICs that are part of $nic.\n"; }
|
|
($realnic) = $nics[0]=~m/^\d+:\s+(\S+): /;
|
|
# do not need to go back thru the ip addr show output and find the mac of this nic because the mac
|
|
# of the bond nic is the same. Plus the code below does not work right for some reason anyway.
|
|
#foreach my $line (@output) {
|
|
# my ($nictmp, $mactmp, $foundnic);
|
|
# if (($nictmp) = $line=~m/^\d+:\s+(\S+): / && $nictmp eq $realnic) { $foundnic = 1; }
|
|
# if (($mactmp) = $line=~m|^\s+link/ether\s+(\S+) | && $foundnic) { $mac = $mactmp; last; } # got mac, we are done
|
|
#}
|
|
}
|
|
|
|
# finally, find the gateway
|
|
my $gateway;
|
|
my @output = runcmd("ip route");
|
|
# we are looking for a line like: 10.0.0.0/8 via 10.54.51.1 dev bond0
|
|
my @networks = grep(m/ via .* $nic\s*$/, @output);
|
|
if (scalar(@networks)) { ($gateway) = $networks[0]=~m/ via\s+(\S+)/; }
|
|
else {
|
|
# use the mn ip as a fall back
|
|
$gateway = $args->{mnip};
|
|
verbose("using xCAT mgmt node IP as the fall back gateway.");
|
|
}
|
|
|
|
verbose("IP info: realnic=$realnic, ip=$ip, netmask=$netmask, gateway=$gateway, mac=$mac");
|
|
return ($realnic, $ip, $netmask, $network, $broadcast, $gateway, $mac);
|
|
}
|
|
|
|
|
|
# Convert an ip/mask in slash notation (like 10.1.1.1/26) to separate ip, netmask, network, and broadcast values,
|
|
# like: 10.1.1.1, 255.255.255.192, 10.1.1.0, 10.1.1.63
|
|
sub convertIpAndMask {
|
|
my $ipandmask = shift @_;
|
|
my ($ip, $masknum) = split('/', $ipandmask);
|
|
|
|
# build the netmask
|
|
my $nmbin = oct("0b" . '1' x $masknum . '0' x (32-$masknum)); # create a str like '1111100', then convert to binary
|
|
my @nmarr=unpack('C4',pack('N',$nmbin)); # separate into the 4 octets
|
|
my $netmask=join('.',@nmarr); # put them together into the normal looking netmask
|
|
|
|
# create binary form of ip
|
|
my @iparr=split(/\./,$ip);
|
|
my ( $ipbin ) = unpack('N', pack('C4',@iparr ) );
|
|
|
|
# Calculate network address by logical AND operation of ip & netmask and convert network address to IP address format
|
|
my $netbin = ( $ipbin & $nmbin );
|
|
my @netarr=unpack('C4', pack('N',$netbin ) );
|
|
my $network=join(".",@netarr);
|
|
|
|
# Calculate broadcast address by inverting the netmask and adding it to the network address
|
|
my $bcbin = ( $ipbin & $nmbin ) + ( ~ $nmbin );
|
|
my @bcarr=unpack('C4', pack('N',$bcbin ) ) ;
|
|
my $broadcast=join(".",@bcarr);
|
|
|
|
return ($ip, $netmask, $network, $broadcast);
|
|
}
|
|
|
|
|
|
# not used - resolve the hostname to an ip addr
|
|
sub getipaddr {
|
|
my $hostname = shift @_;
|
|
my $packed_ip;
|
|
$packed_ip = inet_aton($hostname);
|
|
if (!$packed_ip) { return undef; }
|
|
return inet_ntoa($packed_ip);
|
|
}
|
|
|
|
|
|
# Update the grub config file with a new stanza for booting our kernel and initrd
|
|
sub updateGrub {
|
|
my $args = shift @_;
|
|
|
|
# how we specify the path for the kernel and initrd is different on redhat and suse
|
|
my $fileprefix;
|
|
if (isRedhat()) { $fileprefix = '/'; }
|
|
elsif (isSuse()) { $fileprefix = '/boot/'; }
|
|
else { die "Error: currently only support red hat or suse distros.\n"; }
|
|
|
|
# open the grub file and see if it is in there or if we have to add it
|
|
my $grubfile = findGrubPath();
|
|
verbose("reading $grubfile");
|
|
open(FILE, $grubfile) || die "Error: can not open config file $grubfile for reading: $!\n";
|
|
my @lines = <FILE>;
|
|
close FILE;
|
|
|
|
# this is the entry we want in the grub file
|
|
my @rootlines = grep(/^\s+root\s+/, @lines); # copy one of the existing root lines
|
|
if (!scalar(@rootlines)) { die "Error: can't find an existing line for 'root' in the grub config file\n"; }
|
|
my ($rootline) = $rootlines[0] =~ m/^\s*(.*?)\s*$/;
|
|
my @entry = (
|
|
"title $XCATNETBOOTTITLE\n",
|
|
"\t$rootline\n",
|
|
"\tkernel " . $fileprefix . $args->{kernelpath} . ' ' . $args->{kernelparms} . "\n",
|
|
"\tinitrd " . $fileprefix . $args->{initrdpath} . "\n",
|
|
);
|
|
|
|
my $needtowritefile = 1;
|
|
if (grep(/^title\s+$XCATNETBOOTTITLE/, @lines)) { $needtowritefile = updateGrubEntry(\@lines, \@entry); } # there is already an entry in there
|
|
else { addGrubEntry (\@lines, \@entry); }
|
|
|
|
# write the file with the new/updated xcat entry
|
|
if ($needtowritefile) {
|
|
verbose("updating $grubfile");
|
|
open(FILE, '>', $grubfile) || die "Error: can not open config file $grubfile for writing: $!\n";
|
|
print FILE @lines;
|
|
close FILE;
|
|
}
|
|
else { print "Info: $grubfile did not need modifying. It was already up to date.\n"; }
|
|
}
|
|
|
|
|
|
# add our entry as the 1st one in the grub file
|
|
sub addGrubEntry {
|
|
my ($lines, $entry) = @_;
|
|
# find the index of the 1st stanza (it starts with 'title')
|
|
my $i;
|
|
for ($i=0; $i<scalar(@$lines); $i++) {
|
|
if ($lines->[$i] =~ m/^title\s+/) { verbose('adding xcat entry before:'.$lines->[$i]); last; } # found it
|
|
}
|
|
|
|
# splice the entry right before the i-th line (which may also be 1 past the end)
|
|
splice(@$lines, $i, 0, @$entry);
|
|
}
|
|
|
|
|
|
# check the xcat entry in the grub file and see if it needs to be updated. Return 1 if it does.
|
|
sub updateGrubEntry {
|
|
my ($lines, $entry) = @_;
|
|
#print Dumper($lines), Dumper($entry);
|
|
# find the index of the xcat stanza
|
|
my $i;
|
|
for ($i=0; $i<scalar(@$lines); $i++) {
|
|
if ($lines->[$i] =~ m/^title\s+$XCATNETBOOTTITLE/) { last; } # found it
|
|
}
|
|
|
|
# compare the next few lines with the corresponding line in @$entries and replace if different
|
|
my $replaced = 0;
|
|
for (my $j=0; $j<scalar(@$entry); $j++) {
|
|
#print "comparing:\n ", $lines->[$i+$j], "\n ", $entry->[$j], "\n";
|
|
if ($lines->[$i+$j] ne $entry->[$j]) { # this line was different
|
|
$lines->[$i+$j] = $entry->[$j];
|
|
$replaced = 1;
|
|
}
|
|
}
|
|
|
|
return $replaced;
|
|
}
|
|
|
|
|
|
# depending on the distro, find the correct grub file and return its path
|
|
sub findGrubPath {
|
|
# for rhel/centos it is /boot/grub/grub.conf, for sles it is /boot/grub/menu.lst
|
|
my @paths = qw(/boot/grub/grub.conf /boot/grub/menu.lst);
|
|
foreach my $p (@paths) {
|
|
if (-f $p) { return $p; }
|
|
}
|
|
|
|
die "Error: Can't find grub config file.\n";
|
|
|
|
#todo: support ubuntu: you add an executable file in /etc/grub.d named 06_xcatnetboot that prints out the
|
|
# entry to add. Then run grub-mkconfig.
|
|
}
|
|
|
|
|
|
# Pring msg only if -v was specified
|
|
sub verbose { if ($VERBOSE) { print shift, "\n"; } }
|
|
|
|
# Check the distro we are running on
|
|
sub isSuse { return (-e '/etc/SuSE-release'); }
|
|
sub isRedhat { return (-e '/etc/redhat-release' || -e '/etc/centos-release' || -e '/etc/fedora-release'); } # add chk for fedora
|
|
|
|
|
|
|
|
# Run a command. If called in the context of return an array, it will capture the output
|
|
# of the cmd and return it. Otherwise, it will display the output to stdout.
|
|
# If the cmd has a non-zero rc, this function will die with a msg.
|
|
sub runcmd
|
|
{
|
|
my ($cmd) = @_;
|
|
my $rc;
|
|
|
|
$cmd .= ' 2>&1' ;
|
|
verbose($cmd);
|
|
|
|
my @output;
|
|
if (wantarray) {
|
|
@output = `$cmd`;
|
|
$rc = $?;
|
|
}
|
|
else {
|
|
system($cmd);
|
|
$rc = $?;
|
|
}
|
|
|
|
if ($rc) {
|
|
$rc = $rc >> 8;
|
|
if ($rc > 0) { die "Error: rc $rc return from cmd: $cmd\n"; }
|
|
else { die "Error: system error returned from cmd: $cmd\n"; }
|
|
}
|
|
elsif (wantarray) { return @output; }
|
|
}
|
|
|