[fedora-virt] SOLVED Re: virsh start --console "some-guest" booting options F17 host

[Cole Robinson]

On 07/18/2012 04:22 PM, "Ján ONDREJ (SAL)" wrote:
> On Tue, Jul 17, 2012 at 04:44:18PM -0400, Cole Robinson wrote:
>> On 07/17/2012 01:43 PM, Ján ONDREJ (SAL) wrote:
>>> On Tue, Jul 17, 2012 at 04:49:21PM +0100, Frank Murphy wrote:
>>>> On 15/06/12 01:39, Cole Robinson wrote:
>>>>> On 06/13/2012 04:56 AM, Frank Murphy wrote:
>>>>>> Q1:
>>>>>> virsh start --console "some-guest"
>>>>>> How can a different kernel be booted from?
>>>>>> If kernel=0 won't complete boot.
>>>>>>
>>>>>
>>>>> Maybe try sgabios? Add this to your guest's <os> block:
>>>>>
>>>>> <bios useserial='yes'/>
>>>>
>>>> That was it
>>>
>>> Can I add this using virt-isntall? Can virt-install configure sgabios with
>>> an option?
>>>
>>> Is there any command line tool, which can add/remove/update XML parameters?
>>> Example:
>>>
>>>   tool --add domain.os.bios useserial=yes
>>>
>>> 				SAL
>>
>> There's /usr/bin/xpath but that's for querying only it seems. Would be pretty
>> straightforward to make one for setting arbitrary data.
> 
> OK, I wrote one. Please look at this:
> 
>   http://www.salstar.sk/pub/salpack/usr/sbin/virsh-pyquery
> 
> This script uses pyquery, jquery based selector syntax. If you like jquery
> selectors, then you will like it. It can add/delete/remove/update entities
> or attributes.
> 

Very cool! Something like that should be implemented as a virsh subcommand
(but it would likely use xpath syntax since that's what libvirt uses internally).

>> Though in this case I think finishing off virt-xml is the best way to go, I've
>> just never managed to give it the final push:
>>
>> http://www.redhat.com/archives/virt-tools-list/2011-April/msg00159.html
> 
> Nice too, but limited to only supported options. :(

True, but support also comes with docs, --help discoverability, no need to
know the XML syntax, and future proofing against XML changes. That said there
is definitely a need for both tools.

Thanks,
Cole