/usr/share/system-config-printer/ppdsloader.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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## system-config-printer
## Copyright (C) 2010, 2011, 2012, 2013, 2014 Red Hat, Inc.
## Author: 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
from gi.repository import GObject
from gi.repository import Gtk
import cupshelpers
import cups
cups.require ("1.9.52")
import asyncconn
from debug import debugprint
import config
import gettext
gettext.install(domain=config.PACKAGE, localedir=config.localedir)
class PPDsLoader(GObject.GObject):
"""
1. If PackageKit support is available, and this is a local server,
try to use PackageKit to install relevant drivers. We do this
because we can only make the right choice about the "best" driver
when the full complement of drivers is there to choose from.
2. Fetch the list of available drivers from CUPS.
3. If Jockey is available, and there is no appropriate driver
available, try to use Jockey to install one.
4. If Jockey was able to install one, fetch the list of available
drivers again.
"""
__gsignals__ = {
'finished': (GObject.SignalFlags.RUN_LAST, None, ())
}
def __init__ (self, device_id=None, parent=None, device_uri=None,
host=None, encryption=None, language=None,
device_make_and_model=None):
GObject.GObject.__init__ (self)
debugprint ("+%s" % self)
self._device_id = device_id
self._device_uri = device_uri
self._device_make_and_model = device_make_and_model
self._parent = parent
self._host = host
self._encryption = encryption
self._language = language
self._installed_files = []
self._conn = None
self._ppds = None
self._exc = None
self._ppdsmatch_result = None
self._jockey_queried = False
self._jockey_has_answered = False
self._local_cups = (self._host is None or
self._host == "localhost" or
self._host[0] == '/')
try:
self._bus = dbus.SessionBus ()
except:
debugprint ("Failed to get session bus")
self._bus = None
fmt = _("Searching")
self._dialog = Gtk.MessageDialog (parent=parent,
modal=True, destroy_with_parent=True,
message_type=Gtk.MessageType.INFO,
buttons=Gtk.ButtonsType.CANCEL,
text=fmt)
self._dialog.format_secondary_text (_("Searching for drivers"))
self._dialog.connect ("response", self._dialog_response)
def run (self):
self._dialog.show_all ()
if self._device_id:
self._devid_dict = cupshelpers.parseDeviceID (self._device_id)
if (self._local_cups and
self._device_id and
self._devid_dict["MFG"] and
self._devid_dict["MDL"] and
self._bus):
self._gpk_device_id = "MFG:%s;MDL:%s;" % (self._devid_dict["MFG"],
self._devid_dict["MDL"])
self._query_packagekit ()
else:
self._query_cups ()
def __del__ (self):
debugprint ("-%s" % self)
def destroy (self):
debugprint ("DESTROY: %s" % self)
if self._dialog:
self._dialog.destroy ()
self._dialog = None
self._parent = None
if self._conn:
self._conn.destroy ()
self._conn = None
def get_installed_files (self):
return self._installed_files
def get_ppds (self):
return self._ppds
def get_ppdsmatch_result (self):
return self._ppdsmatch_result
def get_error (self):
debugprint ("%s: stored error is %s" % (self, repr (self._exc)))
return self._exc
def _dialog_response (self, dialog, response):
dialog.destroy ()
self._dialog = None
self.emit ('finished')
def _query_cups (self):
debugprint ("Asking CUPS for PPDs")
if (not self._conn):
c = asyncconn.Connection (host=self._host,
encryption=self._encryption,
reply_handler=self._cups_connect_reply,
error_handler=self._cups_error)
self._conn = c
else:
self._cups_connect_reply(self._conn, None)
def _cups_connect_reply (self, conn, UNUSED):
conn._begin_operation (_("fetching PPDs"))
conn.getPPDs2 (reply_handler=self._cups_reply,
error_handler=self._cups_error)
def _cups_reply (self, conn, result):
ppds = cupshelpers.ppds.PPDs (result, language=self._language)
self._ppds = ppds
self._need_requery_cups = False
if self._device_id:
fit = ppds.\
getPPDNamesFromDeviceID (self._devid_dict["MFG"],
self._devid_dict["MDL"],
self._devid_dict["DES"],
self._devid_dict["CMD"],
self._device_uri,
self._device_make_and_model)
ppdnamelist = ppds.\
orderPPDNamesByPreference (list(fit.keys ()),
self._installed_files,
devid=self._devid_dict,
fit=fit)
self._ppdsmatch_result = (fit, ppdnamelist)
ppdname = ppdnamelist[0]
if (self._bus and
not fit[ppdname].startswith ("exact") and
not self._jockey_queried and
self._devid_dict["MFG"] and
self._devid_dict["MDL"] and
self._local_cups):
# Try to install packages using jockey if
# - there's no appropriate driver (PPD) locally available
# - we are configuring local CUPS server
self._jockey_queried = True
self._query_jockey ()
return
conn.destroy ()
self._conn = None
if self._dialog is not None:
self._dialog.destroy ()
self._dialog = None
self.emit ('finished')
def _cups_error (self, conn, exc):
conn.destroy ()
self._conn = None
self._ppds = None
self._exc = exc
if self._dialog is not None:
self._dialog.destroy ()
self._dialog = None
self.emit ('finished')
def _query_packagekit (self):
debugprint ("Asking PackageKit to install drivers")
try:
obj = self._bus.get_object ("org.freedesktop.PackageKit",
"/org/freedesktop/PackageKit")
proxy = dbus.Interface (obj, "org.freedesktop.PackageKit.Modify")
resources = [self._gpk_device_id]
interaction = "hide-finished"
debugprint ("Calling InstallPrinterDrivers (%s, %s, %s)" %
(repr (0), repr (resources), repr (interaction)))
proxy.InstallPrinterDrivers (dbus.UInt32 (0),
resources, interaction,
reply_handler=self._packagekit_reply,
error_handler=self._packagekit_error,
timeout=3600)
except Exception as e:
debugprint ("Failed to talk to PackageKit: %s" % repr (e))
if self._dialog:
self._dialog.show_all ()
self._query_cups ()
def _packagekit_reply (self):
debugprint ("Got PackageKit reply")
self._need_requery_cups = True
if self._dialog:
self._dialog.show_all ()
self._query_cups ()
def _packagekit_error (self, exc):
debugprint ("Got PackageKit error: %s" % repr (exc))
if self._dialog:
self._dialog.show_all ()
self._query_cups ()
def _query_jockey (self):
debugprint ("Asking Jockey to install drivers")
try:
obj = self._bus.get_object ("com.ubuntu.DeviceDriver", "/GUI")
jockey = dbus.Interface (obj, "com.ubuntu.DeviceDriver")
r = jockey.search_driver ("printer_deviceid:%s" % self._device_id,
reply_handler=self._jockey_reply,
error_handler=self._jockey_error,
timeout=3600)
except Exception as e:
self._jockey_error (e)
def _jockey_reply (self, conn, result):
debugprint ("Got Jockey result: %s" % repr (result))
self._jockey_has_answered = True
try:
self._installed_files = result[1]
except:
self._installed_files = []
self._query_cups ()
def _jockey_error (self, exc):
debugprint ("Got Jockey error: %s" % repr (exc))
if self._need_requery_cups:
self._query_cups ()
else:
if self._conn is not None:
self._conn.destroy ()
self._conn = None
if self._dialog is not None:
self._dialog.destroy ()
self._dialog = None
self.emit ('finished')
if __name__ == "__main__":
class Foo:
def __init__ (self):
w = Gtk.Window ()
b = Gtk.Button.new_with_label ("Go")
w.add (b)
b.connect ('clicked', self.go)
w.connect ('delete-event', Gtk.main_quit)
w.show_all ()
self._window = w
def go (self, button):
loader = PPDsLoader (device_id="MFG:MFG;MDL:MDL;",
parent=self._window)
loader.connect ('finished', self.ppds_loaded)
loader.run ()
def ppds_loaded (self, ppdsloader):
self._window.destroy ()
Gtk.main_quit ()
exc = ppdsloader.get_error ()
print(exc)
ppds = ppdsloader.get_ppds ()
if ppds is not None:
print(len (ppds))
ppdsloader.destroy ()
from debug import set_debugging
set_debugging (True)
Foo ()
Gtk.main ()
|