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'''Python sys.excepthook hook to generate apport crash dumps.'''
# Copyright (c) 2006 - 2009 Canonical Ltd.
# Authors: Robert Collins <robert@ubuntu.com>
# Martin Pitt <martin.pitt@ubuntu.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. See http://www.gnu.org/copyleft/gpl.html for
# the full text of the license.
import os
import sys
CONFIG = '/etc/default/apport'
def enabled():
'''Return whether Apport should generate crash reports.'''
# This doesn't use apport.packaging.enabled() because it is too heavyweight
# See LP: #528355
import re
try:
with open(CONFIG) as f:
conf = f.read()
return re.search(r'^\s*enabled\s*=\s*0\s*$', conf, re.M) is None
except IOError:
# if the file does not exist, assume it's enabled
return True
def apport_excepthook(exc_type, exc_obj, exc_tb):
'''Catch an uncaught exception and make a traceback.'''
# create and save a problem report. Note that exceptions in this code
# are bad, and we probably need a per-thread reentrancy guard to
# prevent that happening. However, on Ubuntu there should never be
# a reason for an exception here, other than [say] a read only var
# or some such. So what we do is use a try - finally to ensure that
# the original excepthook is invoked, and until we get bug reports
# ignore the other issues.
# import locally here so that there is no routine overhead on python
# startup time - only when a traceback occurs will this trigger.
try:
# ignore 'safe' exit types.
if exc_type in (KeyboardInterrupt, ):
return
# if python apt modules are not built for the python version than it
# is not supported. LP: #1774843
try:
import apt_pkg
# make pyflakes happy
apt_pkg.DATE
except ImportError:
return
# do not do anything if apport was disabled
if not enabled():
return
try:
from cStringIO import StringIO
StringIO # pyflakes
except ImportError:
from io import StringIO
import re, traceback
from apport.fileutils import likely_packaged, get_recent_crashes
# apport will look up the package from the executable path.
try:
binary = os.path.realpath(os.path.join(os.getcwd(), sys.argv[0]))
except (TypeError, AttributeError, IndexError):
# the module has mutated sys.argv, plan B
try:
binary = os.readlink('/proc/%i/exe' % os.getpid())
except OSError:
return
# for interactive python sessions, sys.argv[0] == ''; catch that and
# other irregularities
if not os.access(binary, os.X_OK) or not os.path.isfile(binary):
return
# filter out binaries in user accessible paths
if not likely_packaged(binary):
return
import apport.report
pr = apport.report.Report()
# special handling of dbus-python exceptions
if hasattr(exc_obj, 'get_dbus_name'):
name = exc_obj.get_dbus_name()
if name == 'org.freedesktop.DBus.Error.NoReply':
# NoReply is an useless crash, we do not even get the method it
# was trying to call; needs actual crash from D-BUS backend (LP #914220)
return
elif name == 'org.freedesktop.DBus.Error.ServiceUnknown':
dbus_service_unknown_analysis(exc_obj, pr)
else:
pr['_PythonExceptionQualifier'] = name
# disambiguate OSErrors with errno:
if exc_type == OSError and exc_obj.errno is not None:
pr['_PythonExceptionQualifier'] = str(exc_obj.errno)
# append a basic traceback. In future we may want to include
# additional data such as the local variables, loaded modules etc.
tb_file = StringIO()
traceback.print_exception(exc_type, exc_obj, exc_tb, file=tb_file)
pr['Traceback'] = tb_file.getvalue().strip()
pr.add_proc_info(extraenv=['PYTHONPATH', 'PYTHONHOME'])
pr.add_user_info()
# override the ExecutablePath with the script that was actually running
pr['ExecutablePath'] = binary
if 'ExecutableTimestamp' in pr:
pr['ExecutableTimestamp'] = str(int(os.stat(binary).st_mtime))
try:
pr['PythonArgs'] = '%r' % sys.argv
except AttributeError:
pass
if pr.check_ignored():
return
mangled_program = re.sub('/', '_', binary)
# get the uid for now, user name later
user = os.getuid()
pr_filename = '%s/%s.%i.crash' % (os.environ.get(
'APPORT_REPORT_DIR', '/var/crash'), mangled_program, user)
crash_counter = 0
if os.path.exists(pr_filename):
if apport.fileutils.seen_report(pr_filename):
# flood protection
with open(pr_filename, 'rb') as f:
crash_counter = get_recent_crashes(f) + 1
if crash_counter > 1:
return
# remove the old file, so that we can create the new one with
# os.O_CREAT|os.O_EXCL
os.unlink(pr_filename)
else:
# don't clobber existing report
return
if crash_counter:
pr['CrashCounter'] = str(crash_counter)
with os.fdopen(os.open(pr_filename,
os.O_WRONLY | os.O_CREAT | os.O_EXCL, 0o640), 'wb') as f:
pr.write(f)
finally:
# resume original processing to get the default behaviour,
# but do not trigger an AttributeError on interpreter shutdown.
if sys:
sys.__excepthook__(exc_type, exc_obj, exc_tb)
def dbus_service_unknown_analysis(exc_obj, report):
from glob import glob
import subprocess, re
try:
from configparser import ConfigParser, NoSectionError, NoOptionError
(ConfigParser, NoSectionError, NoOptionError) # pyflakes
except ImportError:
# Python 2
from ConfigParser import ConfigParser, NoSectionError, NoOptionError
# determine D-BUS name
m = re.search(r'name\s+(\S+)\s+was not provided by any .service',
exc_obj.get_dbus_message())
if not m:
if sys.stderr:
sys.stderr.write('Error: cannot parse D-BUS name from exception: ' +
exc_obj.get_dbus_message())
return
dbus_name = m.group(1)
# determine .service file and Exec name for the D-BUS name
services = [] # tuples of (service file, exe name, running)
for f in glob('/usr/share/dbus-1/*services/*.service'):
cp = ConfigParser(interpolation=None)
cp.read(f, encoding='UTF-8')
try:
if cp.get('D-BUS Service', 'Name') == dbus_name:
exe = cp.get('D-BUS Service', 'Exec')
running = (subprocess.call(['pidof', '-sx', exe], stdout=subprocess.PIPE) == 0)
services.append((f, exe, running))
except (NoSectionError, NoOptionError):
if sys.stderr:
sys.stderr.write('Invalid D-BUS .service file %s: %s' % (
f, exc_obj.get_dbus_message()))
continue
if not services:
report['DbusErrorAnalysis'] = 'no service file providing ' + dbus_name
else:
report['DbusErrorAnalysis'] = 'provided by'
for (service, exe, running) in services:
report['DbusErrorAnalysis'] += ' %s (%s is %srunning)' % (
service, exe, ('' if running else 'not '))
def install():
'''Install the python apport hook.'''
sys.excepthook = apport_excepthook
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