libvirt users - Nov 2022 - domain_qemu_agent_command($domain,$cmd,$timeout,$flags)

Hi Michal,

Can you advise why the following warning is logged for this command:
domain_qemu_agent_command($res,
'{"execute":"guest-network-get-interfaces"}', 10, 0)
;

warning : qemuDomainObjTaintMsg:6464 : Domain id=1 name='HA'
uuid=ffbc955e-9a51-f1d1-2501-b4cbdac5dd4c is tainted: custom-ga-command

Regards

On Wed, Oct 26, 2022 at 8:21 AM Michal Pr?vozn?k <mprivozn at redhat.com>
wrote:
> On 10/25/22 20:04, Simon Fairweather wrote:
> > Should there be a way to suppress errors using the flags?
> >
> >  error : qemuDomainAgentAvailable:8411 : Guest agent is not
responding:
> > QEMU guest agent is not connected
> >
> >
> > Or is there a libvirt function to check connection status or another
way?
>
> This error message is "harmless" in a sense that there is no
split brain
> of states between libvirt and QEMU. But yeah, your API is going to fail.
>
> You can check for the agent status in the domain XML, for instance with
> the following (rewrite in your favorite language):
>
> virsh dumpxml fedora | xpath -e
>
"string(//channel/target[@name='org.qemu.guest_agent.0']/@state)"
>
> Michal
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://listman.redhat.com/archives/libvirt-users/attachments/20221115/e215a2f8/attachment.htm>

On 11/15/22 14:44, Simon Fairweather wrote:
> Hi Michal,
> 
> Can you advise why the following warning is logged for this command:
> domain_qemu_agent_command($res,
>
'{"execute":"guest-network-get-interfaces"}',?10, 0)
;
> 
> warning : qemuDomainObjTaintMsg:6464 : Domain id=1 name='HA'
> uuid=ffbc955e-9a51-f1d1-2501-b4cbdac5dd4c is tainted: custom-ga-command
Because using qemu-ga can change the state behind libvirt's back. So far
we've ignored tainted flag but the idea is to be similar to kernel and
its tainting.

In this specific case - libvirt offers a this particular command as an API:

libvirt_domain_interface_addresses() in PHP, or
virDomainInterfaceAddresses() in C.

Michal