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#! /usr/bin/env python
# Copyright (C) 2009 Sayamindu Dasgupta <sayamindu@laptop.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import os
import logging
import gobject
import dbus
UDISK_DEVICE_PATH = 'org.freedesktop.UDisks.Device'
class DeviceManager(gobject.GObject):
__gsignals__ = {
'device-changed': (gobject.SIGNAL_RUN_FIRST,
gobject.TYPE_NONE,
([])),
}
def __init__(self):
gobject.GObject.__init__(self)
self._devices = {}
self._bus = dbus.SystemBus()
self._udisk_proxy = self._bus.get_object('org.freedesktop.UDisks',
'/org/freedesktop/UDisks')
self._udisk_iface = dbus.Interface(self._udisk_proxy,
'org.freedesktop.UDisks')
try:
self._populate_devices()
self._udisk_iface.connect_to_signal('DeviceChanged',
self.__device_changed_cb)
except dbus.exceptions.DBusException, e:
logging.error('Exception initializing UDisks: %s', e)
def _populate_devices(self):
for device in self._udisk_proxy.EnumerateDevices():
props = self._get_props_from_device(device)
if props is not None:
logging.debug('Device mounted in %s', props['mount_path'])
props['have_catalog'] = self._have_catalog(props)
self._devices[device] = props
def _get_props_from_device(self, device):
# http://hal.freedesktop.org/docs/udisks/Device.html
device_obj = self._bus.get_object('org.freedesktop.UDisks', device)
device_props = dbus.Interface(device_obj, dbus.PROPERTIES_IFACE)
props = {}
props['mounted'] = bool(device_props.Get(UDISK_DEVICE_PATH,
'DeviceIsMounted'))
if props['mounted']:
props['mount_path'] = str(device_props.Get(UDISK_DEVICE_PATH,
'DeviceMountPaths')[0])
props['removable'] = bool(device_props.Get(UDISK_DEVICE_PATH,
'DriveCanDetach'))
props['label'] = str(device_props.Get(UDISK_DEVICE_PATH,
'IdLabel'))
props['size'] = int(device_props.Get(UDISK_DEVICE_PATH,
'DeviceSize'))
return props
return None
def _have_catalog(self, props):
# Apart from determining if this is a removable volume,
# this also tries to find if there is a catalog.xml in the
# root
if not props['removable']:
return False
mount_point = props['mount_path']
return os.path.exists(os.path.join(mount_point, 'catalog.xml'))
def __device_changed_cb(self, device):
props = self._get_props_from_device(device)
if props is not None:
self._devices[device] = props
have_catalog = self._have_catalog(props)
props['have_catalog'] = have_catalog
if have_catalog:
self.emit('device-changed')
logging.debug('Device was added %s' % props)
else:
if device in self._devices:
props = self._devices[device]
need_notify = props['have_catalog']
logging.debug('Device was removed %s', props)
del self._devices[device]
if need_notify:
self.emit('device-changed')
def get_devices(self):
return self._devices
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