/usr/share/system-config-printer/timedops.py is in system-config-printer-gnome 1.5.7+20160212-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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## Copyright (C) 2008, 2009, 2010, 2012, 2014 Red Hat, Inc.
## Authors:
## Tim Waugh <twaugh@redhat.com>
## 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
import dbus.mainloop.glib
from gi.repository import GObject
from gi.repository import GLib
from gi.repository import Gdk
from gi.repository import Gtk
import subprocess
import threading
import config
import gettext
gettext.install(domain=config.PACKAGE, localedir=config.localedir)
from debug import *
# Initialise threading for D-Bus. This is needed as long as it is
# used from two separate threads. We only do this in a few places
# now, but in particular the troubleshooter does this (bug #662047).
Gdk.threads_init ()
dbus.mainloop.glib.threads_init ()
class OperationCanceled(RuntimeError):
pass
class Timed:
def run (self):
pass
def cancel (self):
return False
class TimedSubprocess(Timed):
def __init__ (self, timeout=60000, parent=None, show_dialog=True,
**args):
self.subp = subprocess.Popen (**args)
self.output = dict()
self.io_source = []
self.watchers = 2
self.timeout = timeout
self.parent = parent
self.show_dialog = show_dialog
for f in [self.subp.stdout, self.subp.stderr]:
if f is not None:
source = GLib.io_add_watch (f,
GLib.IO_IN |
GLib.IO_HUP |
GLib.IO_ERR,
self.watcher)
self.io_source.append (source)
self.wait_window = None
def run (self):
if self.show_dialog:
self.wait_source = GLib.timeout_add_seconds (
1,
self.show_wait_window)
self.timeout_source = GLib.timeout_add (self.timeout,
self.do_timeout)
Gtk.main ()
if self.timeout_source:
GLib.source_remove (self.timeout_source)
if self.show_dialog:
GLib.source_remove (self.wait_source)
for source in self.io_source:
GLib.source_remove (source)
if self.wait_window is not None:
self.wait_window.destroy ()
return (self.output.get (self.subp.stdout, '').split ('\n'),
self.output.get (self.subp.stderr, '').split ('\n'),
self.subp.poll ())
def do_timeout (self):
self.timeout_source = None
Gtk.main_quit ()
return False
def watcher (self, source, condition):
if condition & GLib.IO_IN:
buffer = self.output.get (source, '')
buffer += (source.read ()).decode("utf-8")
self.output[source] = buffer
if condition & GLib.IO_HUP:
self.watchers -= 1
if self.watchers == 0:
Gtk.main_quit ()
return True
def show_wait_window (self):
Gdk.threads_enter ()
wait = Gtk.MessageDialog (parent=self.parent,
modal=True, destroy_with_parent=True,
message_type=Gtk.MessageType.INFO,
buttons=Gtk.ButtonsType.CANCEL,
text=_("Please wait"))
wait.connect ("delete_event", lambda *args: False)
wait.connect ("response", self.wait_window_response)
if self.parent:
wait.set_transient_for (self.parent)
wait.set_position (Gtk.WindowPosition.CENTER_ON_PARENT)
wait.format_secondary_text (_("Gathering information"))
wait.show_all ()
self.wait_window = wait
Gdk.threads_leave ()
return False
def wait_window_response (self, dialog, response):
if response == Gtk.ResponseType.CANCEL:
self.cancel ()
def cancel (self):
if self.watchers > 0:
debugprint ("Command canceled")
Gtk.main_quit ()
self.watchers = 0
return False
class OperationThread(threading.Thread):
def __init__ (self, target=None, args=(), kwargs={}):
threading.Thread.__init__ (self)
self.setDaemon (True)
self.target = target
self.args = args
self.kwargs = kwargs
self.exception = None
self.result = None
def run (self):
try:
debugprint ("Calling %s" % self.target)
self.result = self.target (*self.args, **self.kwargs)
debugprint ("Done")
except Exception as e:
debugprint ("Caught exception %s" % e)
self.exception = e
def collect_result (self):
if self.isAlive ():
# We've been canceled.
raise OperationCanceled()
if self.exception:
raise self.exception
return self.result
class TimedOperation(Timed):
def __init__ (self, target, args=(), kwargs={}, parent=None,
show_dialog=False, callback=None, context=None):
self.wait_window = None
self.parent = parent
self.show_dialog = show_dialog
self.callback = callback
self.context = context
self.thread = OperationThread (target=target,
args=args,
kwargs=kwargs)
self.thread.start ()
self.use_callback = callback is not None
if self.use_callback:
self.timeout_source = GLib.timeout_add (50, self._check_thread)
def run (self):
if self.use_callback:
raise RuntimeError
if self.show_dialog:
wait = Gtk.MessageDialog (parent=self.parent,
modal=True, destroy_with_parent=True,
message_type=Gtk.MessageType.INFO,
buttons=Gtk.ButtonsType.CANCEL,
text=_("Please wait"))
wait.connect ("delete_event", lambda *args: False)
wait.connect ("response", self._wait_window_response)
if self.parent:
wait.set_transient_for (self.parent)
wait.set_position (Gtk.WindowPosition.CENTER_ON_PARENT)
wait.format_secondary_text (_("Gathering information"))
wait.show_all ()
self.timeout_source = GLib.timeout_add (50, self._check_thread)
Gtk.main ()
if self.timeout_source:
GLib.source_remove (self.timeout_source)
if self.show_dialog:
wait.destroy ()
return self.thread.collect_result ()
def _check_thread (self):
if self.thread.isAlive ():
# Thread still running.
return True
# Thread has finished. Stop the sub-loop or trigger callback.
self.timeout_source = False
if self.use_callback:
if self.callback is not None:
if self.context is not None:
self.callback (self.thread.result, self.thread.exception,
self.context)
else:
self.callback (self.thread.result, self.thread.exception)
else:
Gtk.main_quit ()
return False
def _wait_window_response (self, dialog, response):
if response == Gtk.ResponseType.CANCEL:
self.cancel ()
def cancel (self):
debugprint ("Command canceled")
if self.use_callback:
self.callback = None
else:
Gtk.main_quit ()
return False
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