gen_libvirt_xml

#!/usr/bin/perl
#
# Copyright 2009-2012 Eucalyptus Systems, Inc.
#
# This program is free software: you can redistribute it and/or modify
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# this generates an XML template for libvirt domain specification,
# which is tailored to an instance by the node controller

use diagnostics;
use warnings; 
use sigtrap;
use strict;
use English; # for descriptive predefined var names
use Data::Dumper; # for debugging: print Dumper($var)
use Getopt::Long;
use FindBin;
$OUTPUT_AUTOFLUSH = 1; # no output buffering

our $use_ramdisk = 0;
our $use_ephemeral = 0;
our $use_kernel = 0;
our $plaindisk = 0;

# deal with command-line parameters
GetOptions('ramdisk'        => sub { $use_ramdisk = 1; },
           'ephemeral'      => sub { $use_ephemeral = 1; },
	   'kernel'         => sub { $use_kernel = 1; }
		   ) or exit (1);

if (!$use_ramdisk && !$use_kernel) {
    $plaindisk = 1;
}

print <<EOF;
<domain type='xen'>
    <name>NAME</name>
    <os>
EOF


if (!$plaindisk) {
    print "        <type>linux</type>\n";
    if ($use_kernel) {
	print "        <kernel>BASEPATH/kernel</kernel>\n";
    }
    if ( $use_ramdisk ) {
	print "        <initrd>BASEPATH/ramdisk</initrd>\n";
    }
    print "        <root>/dev/sda1</root>\n";
    print "        <cmdline> ro</cmdline>\n";
} else {
    print "            <type>hvm</type>\n";
    print "            <loader>/usr/lib/xen/boot/hvmloader</loader>\n";
}


print <<EOF;
    </os>
EOF

if ($plaindisk) {
print <<EOF;
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='localtime'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
EOF
}

print <<EOF;
    <memory>MEMORY</memory>
    <vcpu>VCPUS</vcpu>
    <devices>
EOF

if ($plaindisk) {
    print "        <emulator>/usr/lib64/xen/bin/qemu-dm</emulator>\n";
}

print <<EOF;
        <disk type='file'>
            <source file='BASEPATH/root'/>
EOF

if ($plaindisk) {
    print "            <target dev='hda' bus='ide'/>\n";
} else {
    print "            <target dev='sda1'/>\n";
}

print <<EOF;
        </disk>
EOF

if (!$plaindisk) {
    if ( $use_ephemeral ) {
print <<EOF;
        <disk type='file'>
            <source file='BASEPATH/ephemeral'/>
            <target dev='sda2'/>
	</disk>
EOF
    }
}

if (!$plaindisk) {
print <<EOF;
        <disk type='file'>
            <source file='SWAPPATH/swap'/>
            <target dev='sda3'/>
        </disk>
EOF
}

if ($plaindisk) {
print <<EOF;
        <disk type='file' device='floppy'>
          <source file='BASEPATH/floppy'/>
          <target dev='fda'/>
        </disk>
EOF
}

print <<EOF;
        <interface type='bridge'>
            <source bridge='BRIDGEDEV'/>
            <mac address='PRIVMACADDR'/>
            <script path='/etc/xen/scripts/vif-bridge'/>
        </interface>
EOF
if ($plaindisk) {
print <<EOF;
        <serial type='pty'>
           <source path='/dev/pts/3'/>
           <target port='0'/>
        </serial>
        <input type='tablet' bus='usb'/>
        <input type='mouse' bus='ps2'/>
EOF
}

print <<EOF;
        <!-- <graphics type='vnc' port='-1' autoport='yes' keymap='en-us' listen='0.0.0.0'/> -->
    </devices>
</domain>
EOF