/usr/share/pyshared/udevdiscover/devicefinder.py is in udev-discover 0.2.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# vim: ts=4
###
#
# Copyright (c) 2010 J. Félix Ontañón
#
# Almost based on arista.inputs module:
# Copyright 2008 - 2010 Daniel G. Taylor <dan@programmer-art.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3 as
# published by the Free Software Foundation
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Authors : J. Félix Ontañón <fontanon@emergya.es>
#
from gi.repository import GObject
import gudev
import device
def get_subsystems():
client = gudev.Client('')
subsys = []
for device in client.query_by_subsystem('*'):
device_subsystem = device.get_subsystem()
if not device_subsystem in subsys:
subsys.append(device_subsystem)
return subsys
class DeviceFinder(GObject.GObject):
'''
An object that will find and monitor devices on your
machine and emit signals when are added / removed / changed
'''
__gsignals__ = {
'added': (GObject.SignalFlags.RUN_LAST, None,
(GObject.TYPE_PYOBJECT,)),
'removed': (GObject.SignalFlags.RUN_LAST, None,
(GObject.TYPE_PYOBJECT,)),
'changed': (GObject.SignalFlags.RUN_LAST, None,
(GObject.TYPE_PYOBJECT,)),
}
def __init__(self, subsystems='', parent_tree=False):
'''
Create a new DeviceFinder and attach to the udev system to
listen for events.
'''
GObject.GObject.__init__(self)
self.client = gudev.Client(subsystems)
self.subsystems = subsystems
self.parent_tree = parent_tree
self.devices_tree = {}
self.devices_list = []
self.client.connect('uevent', self.event)
def scan_subsystems(self, subsystems='', parent_tree=False):
self.client = gudev.Client(subsystems)
self.subsystems = subsystems
self.devices_tree = {}
self.devices_list = []
if subsystems == '': subsystems = ['*']
for subsystem in subsystems:
for gudevice in self.client.query_by_subsystem(subsystem):
if parent_tree:
self.__explore_parent(gudevice, self.devices_tree,
self.devices_list)
else:
self.devices_list.append(device.get_device_object(gudevice))
self.devices_tree[gudevice.get_sysfs_path()] = \
device.get_device_object(gudevice)
self.client.connect('uevent', self.event)
self.parent_tree = parent_tree
def __explore_parent(self, gudevice, devices_tree, devices_list, emit=False):
path = gudevice.get_sysfs_path()
parent = gudevice.get_parent()
if parent:
self.__explore_parent(parent, devices_tree, devices_list, emit)
if not devices_tree.has_key(path):
dev = device.get_device_object(gudevice)
devices_tree[path] = dev
devices_list.append(dev)
if emit:
self.emit('added', dev)
def get_devices_tree(self):
return self.devices_tree
def get_devices(self):
return self.devices_list
def event(self, client, action, gudevice):
'''Handle a udev event'''
return {
'add': self.device_added,
'remove': self.device_removed,
'change': self.device_changed,
}.get(action, lambda x,y: None)(gudevice, gudevice.get_subsystem())
def device_added(self, gudevice, subsystem):
'''Called when a device has been added to the system'''
dev = device.get_device_object(gudevice)
if self.parent_tree:
self.__explore_parent(gudevice, self.devices_tree, self.devices_list, True)
else:
self.devices_list.append(dev)
self.devices_tree[dev.path] = dev
self.emit('added', dev)
def device_removed(self, gudevice, subsystem):
'''Called when a device has been removed from the system'''
dev = device.get_device_object(gudevice)
if dev in self.devices_list: self.devices_list.remove(dev)
if self.devices_tree.has_key(dev.path): del(self.devices_tree[dev.path])
self.emit('removed', dev)
def device_changed(self, gudevice, subsystem):
'''Called when a device has been updated'''
dev = device.get_device_object(gudevice)
self.emit('changed', dev)
GObject.type_register(DeviceFinder)
if __name__ == '__main__':
import pprint
from gi.repository import GObject
def found(finder, device):
print 'Added', device.path + ': ' + device.nice_label
def lost(finder, device):
print 'Removed', device.path + ': ' + device.nice_label
def changes(finder, device):
print 'Changed', device.path + ': ' + device.nice_label
finder = DeviceFinder()
pprint.pprint(finder.get_subsystems())
finder.connect('added', found)
finder.connect('removed', lost)
finder.connect('changed', changes)
finder.scan_subsystems()
pprint.pprint(finder.devices_list)
loop = GObject.MainLoop()
loop.run()
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