[libvirt] virsh attach-disk using files and KVM

[Ryan Harper]

* Daniel P. Berrange <berrange at redhat.com> [2010-08-18 12:35]:
> On Wed, Aug 18, 2010 at 12:22:27PM -0500, Ryan Harper wrote:
> > Currently virsh attach-disk interface only accepts 'file' or 'tap' for
> > driver type when attaching files as disks.  One can succesfully attach
> > a file as disk with:
> > 
> > virsh attach-disk <vm> <file> <drive> --driver file --type disk
> > 
> > which generates the following xml which is passed to libvirt:
> > 
> > 
> >  <disk type='file' device='disk'>
> >    <driver name='file' type='raw'/>
> >    <source file='/images/test02.img'/>
> >    <target dev='vdc' bus='virtio'/>
> >    <alias name='virtio-disk2'/>
> >    <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
> >  </disk>
> > 
> > 
> > Now, if you shutdown the guest and restart, libvirt complains that the
> > driver type 'file' isn't supported.  This is from
> > src/qemu/qemu_conf.c:4146 where if the driver name isn't 'qemu' it
> > rejects the configuration.  
> > 
> > How best to resolve this?  Update qemu_conf.c to accept 'file' type?
> > update virsh to allow specifying 'qemu' as a driver type for files?
> 
> No, 'file' is not the correct type for QEMU. virsh is broken - it has
> no business doing any validation checks for these parameters. It must
> be left upto the driver itself to validate

ok, so rip out all of the driver and mode check  and just let it make
the xml from the inputs and let libvirt validate?

> 
> Daniel
> -- 
> |: Red Hat, Engineering, London    -o-   http://people.redhat.com/berrange/ :|
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-- 
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
ryanh at us.ibm.com