Re: [libvirt-users] Help needed in simulating libvirt

[Arun Viswanath <arun.viswanath@xxxxxxxxx>]

Hi,

Thanks for the response.

I've used the URI:

"test+ssh://<ipaddress>/default" and the connection is successful and with that connection I issued getCapabilities and its result is attached.

I'm not sure how is result xml generated by the files in the /examples folder.

Will you please explain how is this xml generated.

Also my client is not going to modified. My client is going to connect with the URI "qemu+tls://<host>/system?no_tty=1", so I can't directly use the test driver here so I need to replace the qemu driver with the test driver and give my dummy response. So I need to know how to replace the driver say qemu with test driver and generating my desired output.

If the test driver is not going to support me too much then I might want to write new driver. Is there is any reference how to write new driver.

Regards,
Arun V

On Wed, Sep 11, 2013 at 2:23 PM, Daniel P. Berrange <berrange@xxxxxxxxxx> wrote:

On Wed, Sep 11, 2013 at 12:50:37PM +0530, Arun Viswanath wrote:
> Hi Eric,
>
> Thanks for your response.
> I like to know how test driver works.
>
> In the libvirt.org for test driver it is mentioned as "It can start with a
> pre-configured default config, or be given a path to an alternate config".
> Is the config is an xml file where we mentioned some dummy data so that the
> test driver will return it as response. If yes then where can I find this
> dummy file?
>
> As mentioned earlier my intention is to mock qemu calls. so it test driver
> works then I'm planning to remove the qemu driver and register "test"
> driver as "qemu" driver and take the fake data from the config file. Please
> let me know which are the files I need to look into to register "test" as
> "qemu" and make its operations to work.

The XML file is provided via the URI. For example

   test:///default

uses a built-in config, but you can supply a real path eg

   test:///home/berrange/testnode.xml


Take a look at examples/xml/test/testnode.xml  in the libvirt source
tree for an example.

FYI, the test driver is used very successfully in virt-install and
virt-manager for testing their functionality in an automated way,
so I can strongly recommend its use, over trying to mock the APIs
or wire protocol yourself.

Daniel
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<capabilities>

  <host>
    <cpu>
      <arch>i686</arch>
      <features>
        <pae/>
        <nonpae/>
      </features>
    </cpu>
    <power_management/>
    <topology>
      <cells num='2'>
        <cell id='0'>
          <cpus num='8'>
            <cpu id='0'/>
            <cpu id='2'/>
            <cpu id='4'/>
            <cpu id='6'/>
            <cpu id='8'/>
            <cpu id='10'/>
            <cpu id='12'/>
            <cpu id='14'/>
          </cpus>
        </cell>
        <cell id='1'>
          <cpus num='8'>
            <cpu id='1'/>
            <cpu id='3'/>
            <cpu id='5'/>
            <cpu id='7'/>
            <cpu id='9'/>
            <cpu id='11'/>
            <cpu id='13'/>
            <cpu id='15'/>
          </cpus>
        </cell>
      </cells>
    </topology>
    <secmodel>
      <model>testSecurity</model>
      <doi></doi>
    </secmodel>
  </host>

  <guest>
    <os_type>hvm</os_type>
    <arch name='i686'>
      <wordsize>32</wordsize>
      <emulator>/usr/bin/test-hv</emulator>
      <domain type='test'>
      </domain>
    </arch>
    <features>
      <pae/>
      <nonpae/>
    </features>
  </guest>

  <guest>
    <os_type>xen</os_type>
    <arch name='i686'>
      <wordsize>32</wordsize>
      <emulator>/usr/bin/test-hv</emulator>
      <domain type='test'>
      </domain>
    </arch>
    <features>
      <pae/>
      <nonpae/>
    </features>
  </guest>

</capabilities>

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