File used for testing ansible dconf module

dconf-test.py

#!/bin/python

import os
import psutil
import subprocess

def _get_existing_dbus_session():
    """
    Detects and returns as existing D-Bus session bus address.

    :returns: string -- D-Bus session bus address. If a running D-Bus session was not detected, returns None.
    """

    # We'll be checking the processes of current user only.
    uid = os.getuid()

    # Go through all the pids for this user, try to extract the D-Bus
    # session bus address from environment, and ensure it is possible to
    # connect to it.
    print ("Trying to detect existing D-Bus user session for user: %d" % uid)

    for pid in psutil.pids():
        process = psutil.Process(pid)
        process_real_uid, _, _ = process.uids()
        try:
            if process_real_uid == uid and 'DBUS_SESSION_BUS_ADDRESS' in process.environ():
                dbus_session_bus_address_candidate = process.environ()['DBUS_SESSION_BUS_ADDRESS']
                print ("Found D-Bus user session candidate at address: %s" % dbus_session_bus_address_candidate)
                command = ['dbus-send', '--address=%s' % dbus_session_bus_address_candidate, '--type=signal', '/', 'com.example.test']
                rc = subprocess.call(command)

                if rc == 0:
                    print ("Verified D-Bus user session candidate as usable at address: %s" % dbus_session_bus_address_candidate)

                    return dbus_session_bus_address_candidate

        # This can happen with things like SSH sessions etc.
        except psutil.AccessDenied:
            pass

    print ("Failed to find running D-Bus user session, will have to start one of our own")

    return None

print (_get_existing_dbus_session())