dosage/dosagelib/updater.py

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# -*- coding: iso-8859-1 -*-
"""
Function to check for updates.
"""
import os
from .configuration import Version as CurrentVersion
from .util import urlopen
from distutils.version import StrictVersion
import requests
# 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/dosage/master/dosage.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."""
session = requests.session()
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page = urlopen(UPDATE_URL, session)
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version, url = None, None
for line in page.text.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)