~0x44/nova/bug838466

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<domain type='${type}'>
    <name>${name}</name>
    <memory>${memory_kb}</memory>
    <os>
#if $type == 'uml'
    #set $disk_prefix = 'ubd'
    #set $disk_bus = 'uml'
        <type>uml</type>
        <kernel>/usr/bin/linux</kernel>
        <root>/dev/ubda1</root>
#else
    #if $type == 'xen'
        #set $disk_prefix = 'sd'
        #set $disk_bus = 'scsi'
            <type>linux</type>
            <root>/dev/xvda1</root>
    #else
        #set $disk_prefix = 'vd'
        #set $disk_bus = 'virtio'
            <type>hvm</type>
	#end if
    #if $getVar('rescue', False)
        <kernel>${basepath}/rescue-kernel</kernel>
        <initrd>${basepath}/rescue-ramdisk</initrd>
    #else
        #if $getVar('kernel', None)
            <kernel>${kernel}</kernel>
            #if $type == 'xen'
                <cmdline>ro</cmdline>
            #else
                <cmdline>root=/dev/vda1 console=ttyS0</cmdline>
            #end if
            #if $getVar('ramdisk', None)
                <initrd>${ramdisk}</initrd>
            #end if
        #else
            <boot dev="hd" />
        #end if
    #end if
#end if
    </os>
    <features>
        <acpi/>
    </features>
    <vcpu>${vcpus}</vcpu>
    <devices>
#if $getVar('rescue', False)
        <disk type='file'>
            <source file='${basepath}/rescue-disk'/>
            <target dev='${disk_prefix}a' bus='${disk_bus}'/>
        </disk>
        <disk type='file'>
            <source file='${basepath}/disk'/>
            <target dev='${disk_prefix}b' bus='${disk_bus}'/>
        </disk>
#else
        <disk type='file'>
            <source file='${basepath}/disk'/>
            <target dev='${disk_prefix}a' bus='${disk_bus}'/>
        </disk>
#end if
        <interface type='bridge'>
            <source bridge='${bridge_name}'/>
            <mac address='${mac_address}'/>
            <!--   <model type='virtio'/>  CANT RUN virtio network right now -->
            <filterref filter="nova-instance-${name}">
                <parameter name="IP" value="${ip_address}" />
                <parameter name="DHCPSERVER" value="${dhcp_server}" />
#if $getVar('extra_params', False)
                ${extra_params}
#end if
            </filterref>
        </interface>
        <serial type="file">
            <source path='${basepath}/console.log'/>
            <target port='1'/>
        </serial>
    </devices>
</domain>