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An engine that listens for libvirt events and resends them to the salt event bus.

The minimal configuration is the following and will listen to all events on the
local hypervisor and send them with a tag starting with ``salt/engines/libvirt_events``:

.. code-block:: yaml

    engines:
        - libvirt_events

Note that the automatically-picked libvirt connection will depend on the value
of ``uri_default`` in ``/etc/libvirt/libvirt.conf``. To force using another
connection like the local LXC libvirt driver, set the ``uri`` property as in the
following example configuration.

.. code-block:: yaml

    engines:
        - libvirt_events:
            uri: lxc:///
            tag_prefix: libvirt
            filters:
                - domain/lifecycle
                - domain/reboot
                - pool

Filters is a list of event types to relay to the event bus. Items in this list
can be either one of the main types (``domain``, ``network``, ``pool``,
``nodedev``, ``secret``), ``all`` or a more precise filter. These can be done
with values like <main_type>/<subtype>. The possible values are in the
CALLBACK_DEFS constant. If the filters list contains ``all``, all
events will be relayed.

Be aware that the list of events increases with libvirt versions, for example
network events have been added in libvirt 1.2.1.

Running the engine on non-root
------------------------------

Running this engine as non-root requires a special attention, which is surely
the case for the master running as user `salt`. The engine is likely to fail
to connect to libvirt with an error like this one:

    [ERROR   ] authentication unavailable: no polkit agent available to authenticate action 'org.libvirt.unix.monitor'


To fix this, the user running the engine, for example the salt-master, needs
to have the rights to connect to libvirt in the machine polkit config.
A polkit rule like the following one will allow `salt` user to connect to libvirt:

.. code-block:: javascript

    polkit.addRule(function(action, subject) {
        if (action.id.indexOf("org.libvirt") == 0 &&
            subject.user == "salt") {
            return polkit.Result.YES;
        }
    });

:depends: libvirt 1.0.0+ python binding

.. versionadded:: 2019.2.0
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