~mvo/ubuntu-sso-client/strawman-lp711413

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#!/usr/bin/python

# ubuntu-sso-login - Client side log-in utility for Ubuntu One
#
# Author: Rodney Dawes <rodney.dawes@canonical.com>
# Author: Natalia B. Bidart <natalia.bidart@canonical.com>
#
# Copyright 2009-2010 Canonical Ltd.
#
# 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 warranties of
# MERCHANTABILITY, SATISFACTORY QUALITY, 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/>.

"""Run the dbus service for UserManagement and ApplicationCredentials."""

# Invalid name "ubuntu-sso-login", pylint: disable=C0103

# import decimal even if we don't need it, pylint: disable=W0611
import decimal
# This is a workaround for LP: #467397. Some module in our depency chain sets
# the locale and imports decimal, and that generates the following trace:
# Traceback (most recent call last):
#   File "/usr/lib/ubuntu-sso-client/ubuntu-sso-login", line 33
#     from ubuntu_sso.main import SSOLogin, SSOCredentials
#   File "/usr/lib/pymodules/python2.6/ubuntu_sso/main.py", line 42
#     from lazr.restfulclient.resource import ServiceRoot
#   File "/usr/lib/python2.6/dist-packages/lazr/restfulclient/resource.py",
# line 34
#     import simplejson
#   File "/usr/lib/pymodules/python2.6/simplejson/__init__.py", line 109
#     from decimal import Decimal
#   File "/usr/lib/python2.6/decimal.py", line 3649, in <module>
#     val = globals()[globalname]
# KeyError: 'ROUND_CEiLiNG'

import signal
import sys

import dbus.mainloop.glib
import dbus.service
import gtk

from dbus.mainloop.glib import DBusGMainLoop

from ubuntu_sso import (DBUS_BUS_NAME, DBUS_ACCOUNT_PATH, DBUS_CRED_PATH,
    DBUS_CREDENTIALS_PATH)
from ubuntu_sso.main import SSOLogin, SSOCredentials, CredentialsManagement

from ubuntu_sso.logger import setup_logging

# Invalid name "ubuntu-sso-login"
# pylint: disable=C0103


logger = setup_logging("ubuntu-sso-login")
dbus.mainloop.glib.threads_init()
gtk.gdk.threads_init()
DBusGMainLoop(set_as_default=True)


def sighup_handler(*a, **kw):
    """Stop the service."""
    # This handler may be called in any thread, so is not thread safe.
    # See the link below for info:
    # www.listware.net/201004/gtk-devel-list/115067-unix-signals-in-glib.html
    #
    # gtk.main_quit and the logger methods are safe to be called from any
    # thread. Just don't call other random stuff here.
    logger.info("Stoping Ubuntu SSO login manager since SIGHUP was received.")
    gtk.main_quit()


if __name__ == "__main__":
    # Register DBus service for making sure we run only one instance
    bus = dbus.SessionBus()
    name = bus.request_name(DBUS_BUS_NAME,
                            dbus.bus.NAME_FLAG_DO_NOT_QUEUE)
    if name == dbus.bus.REQUEST_NAME_REPLY_EXISTS:
        logger.error("Ubuntu SSO login manager already running, quitting.")
        sys.exit(0)

    logger.debug("Hooking up SIGHUP with handler %r.", sighup_handler)
    signal.signal(signal.SIGHUP, sighup_handler)

    logger.info("Starting Ubuntu SSO login manager for bus %r.", DBUS_BUS_NAME)
    bus_name = dbus.service.BusName(DBUS_BUS_NAME, bus=dbus.SessionBus())
    SSOLogin(bus_name, object_path=DBUS_ACCOUNT_PATH)
    SSOCredentials(bus_name, object_path=DBUS_CRED_PATH)
    CredentialsManagement(timeout_func=gtk.timeout_add,
                          shutdown_func=gtk.main_quit,
                          bus_name=bus_name, object_path=DBUS_CREDENTIALS_PATH)

    gtk.main()