/usr/share/system-config-printer/troubleshoot/ErrorLogCheckpoint.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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## Printing troubleshooter
## Copyright (C) 2008, 2009, 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.
from gi.repository import Gtk
import cups
import os
from tempfile import NamedTemporaryFile
import datetime
import time
from timedops import TimedOperation, OperationCanceled
from .base import *
try:
from systemd import journal
except:
journal = False
class ErrorLogCheckpoint(Question):
def __init__ (self, troubleshooter):
Question.__init__ (self, troubleshooter, "Error log checkpoint")
page = self.initial_vbox (_("Debugging"),
_("This step will enable debugging output "
"from the CUPS scheduler. This may "
"cause the scheduler to restart. Click "
"the button below to enable debugging."))
button = Gtk.Button.new_with_label (_("Enable Debugging"))
buttonbox = Gtk.HButtonBox ()
buttonbox.set_border_width (0)
buttonbox.set_layout (Gtk.ButtonBoxStyle.START)
buttonbox.pack_start (button, False, False, 0)
self.button = button
page.pack_start (buttonbox, False, False, 0)
self.label = Gtk.Label ()
self.label.set_alignment (0, 0)
self.label.set_line_wrap (True)
page.pack_start (self.label, False, False, 0)
troubleshooter.new_page (page, self)
self.persistent_answers = {}
def __del__ (self):
if not self.persistent_answers.get ('error_log_debug_logging_set',
False):
return
f = self.troubleshooter.answers['_authenticated_connection_factory']
c = f.get_connection ()
c._set_lock (False)
settings = c.adminGetServerSettings ()
if len (list(settings.keys ())) == 0:
return
settings[cups.CUPS_SERVER_DEBUG_LOGGING] = '0'
answers = self.troubleshooter.answers
orig_settings = self.persistent_answers['cups_server_settings']
settings['MaxLogSize'] = orig_settings.get ('MaxLogSize', '2000000')
c.adminSetServerSettings (settings)
def display (self):
self.answers = {}
answers = self.troubleshooter.answers
if not answers['cups_queue_listed']:
return False
self.authconn = answers['_authenticated_connection']
parent = self.troubleshooter.get_window ()
def getServerSettings ():
# Fail if auth required.
cups.setPasswordCB (lambda x: '')
cups.setServer ('')
c = cups.Connection ()
return c.adminGetServerSettings ()
try:
self.op = TimedOperation (getServerSettings, parent=parent)
settings = self.op.run ()
except RuntimeError:
return False
except cups.IPPError:
settings = {}
self.forward_allowed = False
self.label.set_text ('')
if len (list(settings.keys ())) == 0:
# Requires root
return True
else:
self.persistent_answers['cups_server_settings'] = settings
try:
if int (settings[cups.CUPS_SERVER_DEBUG_LOGGING]) != 0:
# Already enabled
return False
except KeyError:
pass
except ValueError:
pass
return True
def connect_signals (self, handler):
self.button_sigid = self.button.connect ('clicked', self.enable_clicked,
handler)
def disconnect_signals (self):
self.button.disconnect (self.button_sigid)
def collect_answer (self):
answers = self.troubleshooter.answers
if not answers['cups_queue_listed']:
return {}
parent = self.troubleshooter.get_window ()
self.answers.update (self.persistent_answers)
if 'error_log_checkpoint' in self.answers:
return self.answers
with NamedTemporaryFile () as tmpf:
try:
self.op = TimedOperation (self.authconn.getFile,
args=('/admin/log/error_log',
tmpf.file),
parent=parent)
self.op.run ()
except (RuntimeError, cups.IPPError) as e:
self.answers['error_log_checkpoint_exc'] = e
except cups.HTTPError as e:
self.answers['error_log_checkpoint_exc'] = e
# Abandon the CUPS connection and make another.
answers = self.troubleshooter.answers
factory = answers['_authenticated_connection_factory']
self.authconn = factory.get_connection ()
self.answers['_authenticated_connection'] = self.authconn
try:
statbuf = os.stat (tmpf.file)
except OSError:
statbuf = [0, 0, 0, 0, 0, 0, 0]
self.answers['error_log_checkpoint'] = statbuf[6]
self.persistent_answers['error_log_checkpoint'] = statbuf[6]
if journal:
j = journal.Reader ()
j.seek_tail ()
cursor = j.get_previous ()['__CURSOR']
self.answers['error_log_cursor'] = cursor
self.persistent_answers['error_log_cursor'] = cursor
now = datetime.datetime.fromtimestamp (time.time ())
timestamp = now.strftime ("%F %T")
self.answers['error_log_timestamp'] = timestamp
self.persistent_answers['error_log_timestamp'] = timestamp
return self.answers
def can_click_forward (self):
return self.forward_allowed
def enable_clicked (self, button, handler):
parent = self.troubleshooter.get_window ()
self.troubleshooter.busy ()
try:
self.op = TimedOperation (self.authconn.adminGetServerSettings,
parent=parent)
settings = self.op.run ()
except (cups.IPPError, OperationCanceled):
self.troubleshooter.ready ()
self.forward_allowed = True
handler (button)
return
self.persistent_answers['cups_server_settings'] = settings.copy ()
MAXLOGSIZE='MaxLogSize'
try:
prev_debug = int (settings[cups.CUPS_SERVER_DEBUG_LOGGING])
except KeyError:
prev_debug = 0
try:
prev_logsize = int (settings[MAXLOGSIZE])
except (KeyError, ValueError):
prev_logsize = -1
if prev_debug == 0 or prev_logsize != '0':
settings[cups.CUPS_SERVER_DEBUG_LOGGING] = '1'
settings[MAXLOGSIZE] = '0'
success = False
def set_settings (connection, settings):
connection.adminSetServerSettings (settings)
# Now reconnect.
attempt = 1
while attempt <= 5:
try:
time.sleep (1)
connection._connect ()
break
except RuntimeError:
# Connection failed
attempt += 1
try:
debugprint ("Settings to set: " + repr (settings))
self.op = TimedOperation (set_settings,
args=(self.authconn, settings,),
parent=parent)
self.op.run ()
success = True
except cups.IPPError:
pass
except RuntimeError:
pass
if success:
self.persistent_answers['error_log_debug_logging_set'] = True
self.label.set_text (_("Debug logging enabled."))
else:
self.label.set_text (_("Debug logging was already enabled."))
self.forward_allowed = True
self.troubleshooter.ready ()
handler (button)
def cancel_operation (self):
self.op.cancel ()
# Abandon the CUPS connection and make another.
answers = self.troubleshooter.answers
factory = answers['_authenticated_connection_factory']
self.authconn = factory.get_connection ()
self.answers['_authenticated_connection'] = self.authconn
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