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# This file is part of Checkbox.
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# Copyright 2012 Canonical Ltd.
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# Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
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# Checkbox is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 3,
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# as published by the Free Software Foundation.
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# Checkbox is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with Checkbox. If not, see <http://www.gnu.org/licenses/>.
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Utility modules for working with various things accessible over dbus
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from dbus import SystemBus
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from dbus.mainloop.glib import DBusGMainLoop
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from dbus import (Array, Boolean, Byte, Dictionary, Double, Int16, Int32,
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Int64, ObjectPath, String, Struct, UInt16, UInt32, UInt64)
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from gi.repository import GObject
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def connect_to_system_bus():
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Connect to the system bus properly.
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Returns a tuple (system_bus, loop) where loop is a GObject.MainLoop
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instance. The loop is there so that you can listen to signals.
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# We'll need an event loop to observe signals. We will need the instance
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# later below so let's keep it. Note that we're not passing it directly
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# below as DBus needs specific API. The DBusGMainLoop class that we
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# instantiate and pass is going to work with this instance transparently.
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# NOTE: DBus tutorial suggests that we should create the loop _before_
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# connecting to the bus.
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logging.debug("Setting up glib-based event loop")
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loop = GObject.MainLoop()
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# Let's get the system bus object. We need that to access UDisks2 object
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logging.debug("Connecting to DBus system bus")
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system_bus = SystemBus(mainloop=DBusGMainLoop())
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return system_bus, loop
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def drop_dbus_type(value):
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Convert types from the DBus bindings to their python counterparts.
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This function is mostly lossless, except for arrays of bytes (DBus
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signature "y") that are transparently converted to strings, assuming
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an UTF-8 encoded string.
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The point of this function is to simplify printing of nested DBus data that
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gets displayed in a rather illegible way.
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if isinstance(value, Array) and value.signature == "y":
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# Some other things are reported as array of bytes that are just
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# strings but due to Unix heritage the encoding is not known.
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# In practice it is better to treat them as UTF-8 strings
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return bytes(value).decode("UTF-8", "replace").strip("\0")
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elif isinstance(value, (Struct, Array)):
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return [drop_dbus_type(item) for item in value]
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elif isinstance(value, (Dictionary)):
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return {drop_dbus_type(dict_key): drop_dbus_type(dict_value)
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for dict_key, dict_value in value.items()}
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elif isinstance(value, (String, ObjectPath)):
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elif isinstance(value, (Byte, UInt16, UInt32, UInt64,
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Int16, Int32, Int64)):
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elif isinstance(value, Boolean):
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elif isinstance(value, Double):
added
removed
checkbox-support/checkbox_support/dbus/__init__.py
