Re: [Users] ovirt VM custom properties

1 Feb 2012


      Not tested, no error handling (eg. does the element exist already)
but ...


#!/usr/bin/python

import os
import sys
import hooking
import traceback


if os.environ.has_key('usbtablet'):
    try:
        sys.stderr.write('tablet: adding usbtablet support\n')
        domxml = hooking.read_domxml()

        devices = domxml.getElementsByTagName('devices')[0]
        tablet = domxml.createElement('input')
        tablet.setAttribute('bus', 'usb')

        devices.appendChild(tablet)

        hooking.write_domxml(domxml)
    except:
        sys.stderr.write('tablet: [unexpected error]: %s\n' % traceback.format_exc())
        sys.exit(2)


----- Original Message -----
...
From: "Chris Brown (GE Healthcare)" <Christopher.Brown@med.ge.com>
To: "Andrew Cathrow" <acathrow@redhat.com>
Cc: users@ovirt.org
Sent: Wednesday, February 1, 2012 5:20:09 PM
Subject: RE: [Users] ovirt VM custom properties
Thanks Andy,
I was afraid that might be case ;)
I'll check out the examples and see what I can come up with.
- Chris
-----Original Message-----
From: Andrew Cathrow [mailto:acathrow@redhat.com]
Sent: Wednesday, February 01, 2012 3:29 PM
To: Brown, Chris (GE Healthcare)
Cc: users@ovirt.org
Subject: Re: [Users] ovirt VM custom properties
----- Original Message -----
...
From: "Chris Brown (GE Healthcare)" <Christopher.Brown@med.ge.com>
To: users@ovirt.org
Sent: Wednesday, February 1, 2012 4:16:35 PM
Subject: [Users] ovirt VM custom properties
In an effort to work around the mouse issues with spice consoles
and
certain guests I had an idea for the time being.
My thought process is to leverage custom properties to enable
usb-tablet support on said guests.
--> (
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Virtualization/3.
0/html/Administration_Guide/VDSM_Hooks.html
)
I perused the available documentation and it appears that these
custom
properties are ultimately fed into the generated libvirt domain
xml.
Thus sifting through -->
http://libvirt.org/formatdomain.html#elementsInput we can pass in:
<devices>
<input type='tablet' bus='usb'/ id='input0'>
</devices>
The issue I am hung up on is that since this contains multi-level
elements can this even be specified as a custom property?
The custom property wouldn't contain the XML it would contain data
you want to pass to a hook script eg. addTablet=true, then it's down
to your hook script to add the appropriate element to the device
node in the libvirt xml.
There's a number of good examples in the vdsm git repo.
...
If so can one of the ovirt developers provide an example on how to
go
about it?
...
- Chris
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