Re: startupPolicy issue when changing CD

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On Fri, Sep 10, 2021 at 14:53:23 +0200, Vojtech Juranek wrote:
> Hi,
> when adding support for CD disk on block based storage into oVirt, 
> I spotted following issue. When starting VM without CD, we add 
> startupPolicy='optional' attribute into <source> element. 
> Whole XML looks like this:
>     <disk type='file' device='cdrom'>
>       <driver name='qemu' error_policy='report'/>
>       <source startupPolicy='optional'/>
>       <target dev='sdc' bus='sata'/>
>       <readonly/>
>       <alias name='ua-d7003457-63c3-4c98-80f0-08ab5042c65e'/>
>       <address type='drive' controller='0' bus='0' target='0' unit='2'/>
>     </disk>
> To change/insert CD we use libvirt.updateDeviceFlags() with XML which 
> looks like this (for block based disk):
> <?xml version='1.0' encoding='utf-8'?>
> <disk device="cdrom" type="block">
>     <source dev="/rhev/data-center/mnt/blockSD/cdac2a0c-b110-456d-a988-7d588626c871/images/638247d7-b4b1-4d98-87fa-c90235fcf4b1/145e7cd2-f92d-4eec-a8fb-6835b4b652e1" />
>     <target bus="sata" dev="sdc" />
> </disk>
> However, updateDeviceFlags() fails with 
>     libvirt.libvirtError: XML error: 'startupPolicy' is only valid for 'file' type volume
> What is the reason for this error? We don't use `startupPolicy` attribute for block
> based disks, as shown on example above.

Hmm, the bug is that the disk source change is attempted before the
update to startup policy, thus the validator is unhappy.

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