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On Wed, Oct 17, 2018 at 10:24:47PM -0700, nils.am...@gmail.com wrote:
> Hi everyone,
>
> I'm trying to run some commands whenever a VM is started or a device is
> attached to a VM. I came upon this Github comment by Marek which says that
> this is possible with Qubes extensions:
> https://github.com/QubesOS/qubes-issues/issues/4126#issuecomment-406888845
>
> I wrote a simple Qubes extension with the following project structure:
>
> my_extension/
> * my_extension/
> ** __init__.py
> * setup.py
>
> With the following `setup.py`:
>
> ```
> #!/usr/bin/env python3
>
> import setuptools
>
> if __name__ == '__main__':
> setuptools.setup(
> name='my_extension',
> version="1.0",
> author='Nils Amiet',
> author_email='nils.am...@foobar.tld',
> description='My extension',
> license='GPLv3',
> url='https://foobar.tld',
>
> packages=('my_extension',),
>
> entry_points={
> 'qubes.ext': [
> 'my_extension = my_extension:MyExtension',
> ],
> }
> )
> ```
>
> And `__init__.py`:
>
> ```
> import qubes.ext
>
>
> class MyExtension(qubes.ext.Extension):
> @qubes.ext.handler("domain-start", system=True)
'domain-start' event is called on VM object, so it should not have
system=True. system=True is needed for events on Qubes() main object
itself, like property-set:default_template.
> def on_vm_start(self, app, event, vm, **kwargs):
For system=False events, it should be:
def on_vm_start(self, vm, event, **kwargs):
If you need to access app, you can still do that through vm.app.
> with open("/tmp/my_extension.log", "a+") as fout:
> print("Started vm: {}".format(vm), file=fout)
>
> ```
>
> Now, I installed this extension on a deployed Qubes OS installation in dom0
> with `sudo ./setup.py install` but the file `/tmp/my_extension.log` is never
> created after having started some VMs. I was expecting to see something being
> written there.
Besides the system=True, everything else looks ok. Remember to restart
qubesd service after installing the extension.
> Why is my extension not being loaded? Am I missing something here? How can I
> debug extensions and make sure they are being loaded? Is there a log
> somewhere?
>
> Is Qubes OS going to call my `on_vm_start()` function whenever a VM is
> started just by installing the extension with `setup.py install`? What should
> I do so that it does?
>
> Thank you and have a nice day,
>
> Nils
>
- --
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
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