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# vim: set fileencoding=UTF-8 :
'''apport package hook for grub2
Author: Jean-Baptiste Lallement <jeanbaptiste.lallement@gmail.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 3 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.
'''
from __future__ import print_function
from apport.hookutils import *
import os
import subprocess
import re
def check_shell_syntax(path):
''' Check the syntax of a shell script '''
try:
with open(os.devnull, 'w') as devnull:
subprocess.check_call(['/bin/sh', '-n', path], stderr=devnull)
except subprocess.CalledProcessError:
return False
return True
def check_shell_syntax_harder(path):
''' Check the syntax of a shell script '''
try:
# sh -n is tempting, but not good enough. Consider this case:
#
# GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash nomodeset”
#
# The quotes are Unicode quotes, not valid in the shell and probably
# caused by copying a line out of a web page. This is parsed as an
# instruction to run the 'splash' command with argument 'nomodeset”'
# and with the GRUB_CMDLINE_LINUX_DEFAULT environment variable set
# to '”quiet'. 'sh -n' allows this because this is a valid parse
# and it's possible that the command 'splash' might exist, but what
# we need to know is whether sourcing the file will fail.
#
# Unfortunately this test may involve executing code. However, this
# file is already sourced as root when running update-grub, so it
# seems unlikely that this could do any further harm.
with open(os.devnull, 'w') as devnull:
subprocess.check_call(
['/bin/sh', '-ec', '. %s' % re.escape(path)], stderr=devnull)
except subprocess.CalledProcessError:
return False
return True
def add_info(report):
if report['ProblemType'] == 'Package':
# To detect if root fs is a loop device
attach_file(report, '/proc/cmdline','ProcCmdLine')
attach_default_grub(report, 'EtcDefaultGrub')
attach_file_if_exists(report, '/boot/grub/device.map', 'DeviceMap')
try:
grub_d = '/etc/default/grub.d'
for name in sorted(os.listdir(grub_d)):
if name.endswith('.cfg'):
key = 'EtcDefaultGrubD.' + path_to_key(name)
attach_file_if_exists(
report, os.path.join(grub_d, name), key)
except OSError:
pass
invalid_grub_script = []
if not check_shell_syntax_harder('/etc/default/grub'):
invalid_grub_script.append('/etc/default/grub')
# Check scripts in /etc/grub.d since some users directly change
# configuration there
grubdir='/etc/grub.d'
for f in os.listdir(grubdir):
fullpath=os.path.join(grubdir, f)
if f != 'README' and os.access(fullpath, os.X_OK) \
and not check_shell_syntax(fullpath):
invalid_grub_script.append(fullpath)
attach_file(report, fullpath)
# TODO: Add some UI to ask if the user modified the invalid script
# and if he still wants to report it
if invalid_grub_script:
report['InvalidGrubScript'] = ' '.join(invalid_grub_script)
if __name__ == '__main__':
r = {}
r['ProblemType'] = 'Package'
add_info(r)
for k, v in r.items():
print('%s: "%s"' % (k, v))
print("========================================")