/usr/lib/python2.7/dist-packages/linkcheck/updater.py is in linkchecker 9.3-1.
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) 2011-2014 Bastian Kleineidam
#
# 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.
"""
Function to check for updates.
"""
import os
from .configuration import Version as CurrentVersion
from .url import get_content
from distutils.version import StrictVersion
# Use the Freecode submit file as source since that file gets updated
# only when releasing a new version.
UPDATE_URL = "https://raw.github.com/wummel/linkchecker/master/linkchecker.freecode"
VERSION_TAG = 'Version:'
if os.name == 'nt':
URL_TAG = 'Windows-installer-URL:'
else:
URL_TAG = 'Source-Package-URL:'
def check_update ():
"""Return the following values:
(False, errmsg) - online version could not be determined
(True, None) - user has newest version
(True, (version, url string)) - update available
(True, (version, None)) - current version is newer than online version
"""
version, value = get_online_version()
if version is None:
# value is an error message
return False, value
if version == CurrentVersion:
# user has newest version
return True, None
if is_newer_version(version):
# value is an URL linking to the update package
return True, (version, value)
# user is running a local or development version
return True, (version, None)
def get_online_version ():
"""Download update info and parse it."""
# prevent getting a cached answer
headers = {'Pragma': 'no-cache', 'Cache-Control': 'no-cache'}
content, info = get_content(UPDATE_URL, addheaders=headers)
if content is None:
return content, info
version, url = None, None
for line in content.splitlines():
if line.startswith(VERSION_TAG):
version = line.split(':', 1)[1].strip()
elif line.startswith(URL_TAG):
url = line.split(':', 1)[1].strip()
url = url.replace('${version}', version)
return version, url
def is_newer_version (version):
"""Check if given version is newer than current version."""
return StrictVersion(version) > StrictVersion(CurrentVersion)
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