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Re: [virt-tools-list] [virt-manager PATCH] Describe controller models in virt-install man page



On 04/26/2013 04:30 PM, Cole Robinson wrote:
> On 04/26/2013 02:58 AM, Martin Kletzander wrote:
>> On 04/25/2013 07:55 PM, Cole Robinson wrote:
>>> On 04/25/2013 06:45 AM, Martin Kletzander wrote:
>>>> Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=952086
>>>>
>>>> Signed-off-by: Martin Kletzander <mkletzan redhat com>
>>>> ---
>>>>  man/virt-install.pod | 6 +++++-
>>>>  1 file changed, 5 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/man/virt-install.pod b/man/virt-install.pod
>>>> index 32eabc6..bf00284 100644
>>>> --- a/man/virt-install.pod
>>>> +++ b/man/virt-install.pod
>>>> @@ -847,7 +847,11 @@ a USB2 controller with fallback USB1 support.
>>>>
>>>>  =item B<model>
>>>>
>>>> -Controller model.
>>>> +Controller model.  These may vary according to the hypervisor and its
>>>> +version.  Most commonly used models are e.g. B<auto>, B<virtio-scsi>
>>>> +for the B<scsi> controller, B<ehci> or B<none> for the B<usb>
>>>> +controller.  For full list and further details on controllers/models,
>>>> +see C<http://libvirt.org/formatdomain.html#elementsControllers>.
>>>>
>>>>  =item B<address>
>>>>
>>>
>>> ACK, please push.
>>>
>>
>> Thanks, pushed.
>>
>>> Would be nice if we got to a point that --controller model=? could print out
>>> all supported model values. Even better if we could get that info from libvirt
>>> and not duplicate it internally. But that's not in the near term.
>>>
>>
>> Definitely get the info from libvirt (which we can now partially do from
>> the RNG scheme, but that seems pretty cumbersome to me).
>>
> 
> Is there an API to access RNG or do we just pull from the local FS? Either way
> probably not too cumbersome if we use standard libs to parse it, certainly
> better than constantly having to update our whitelists.
> 

Unfortunately, the schemes are not part of any API, but they should be
supplied in the libvirt-client rpm.  I haven't found any RelaxNG
parsing utilities that would easily got us the info, although in my
imagination it was something like:

parser.xpath('/domain/device/controller').validAttribs('type')
returns [['fdc', 'ide', 'sata', 'ccid'], ['scsi'], ['usb'], ['pci']]

parser.xpath('/domain/device/controller[ type="pci"]').validAttribs('model')
returns ['pci-root', 'pci-bridge']

And I understand that's a bit much to want.  However, there might be some
possibilities with translating the rng into rnc and parsing the values from
there as that wouldn't be so change-prone in case there's some definition
mangling in RNG schemas in the future.

All I know for now, let me know what you think, I'll see what I can do with
that when I'll get to that.

Have a nice day,
Martin


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