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[libvirt] empty type parameter in driver tag for disk in machine xml file



I updated my system from libvirt 0.7.1 to 0.7.7, one of my qemu-kvm VMs 
was not starting anymore, with this error:

LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin HOME=/ TMPDIR=/tmp 
QEMU_AUDIO_DRV=none /usr/bin/qemu-kvm -S -M pc-0.11 -enable-kvm -m 512 -
smp 1,sockets=1,cores=1,threads=1 -name debian-testing -uuid 54f57a86-
b84c-61ba-7f2a-c69f39f80a41 -nodefaults -chardev socket,id=monitor,path=/
var/lib/libvirt/qemu/debian-testing.monitor,server,nowait -mon 
chardev=monitor,mode=readline -rtc base=utc -boot c -drive file=/home/
frederik/Software/iso/debian-testing-amd64-
netinst.iso,if=none,media=cdrom,id=drive-ide0-1-0 -device ide-
drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -drive file=/home/
frederik/VM/debian-testing.img,if=none,id=drive-virtio-
disk0,boot=on,format= -device virtio-blk-
pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0 -device 
virtio-net-pci,vlan=0,id=net0,mac=52:54:00:25:9c:a0,bus=pci.0,addr=0x5 -
net tap,fd=19,vlan=0,name=hostnet0 -chardev pty,id=serial0 -device isa-
serial,chardev=serial0 -usb -device usb-tablet,id=input0 -vnc 127.0.0.1:1 
-k fr-be -vga vmware -device ES1370,id=sound0,bus=pci.0,addr=0x6 -device 
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 
char device redirected to /dev/pts/6
qemu: '' invalid format


It seems this part of the libvirt xml file was causing the problem:

    <disk type='file' device='disk'>
      <driver name='qemu' type=''/>
      <source file='/home/frederik/VM/debian-testing.img'/>
      <target dev='vda' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' 
function='0x0'/>
    </disk>

Notice the empty type parameter in the driver tag. Removing type='' 
completely, makes the machine start fine.

Is this a bug which should be fixed, so that libvirt can deal empty type 
tags, possible set by older versions?

-- 
Frederik Himpe


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