/usr/lib/python3/dist-packages/DistUpgrade/MetaRelease.py is in python3-distupgrade 1:16.04.12.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# -*- Mode: Python; indent-tabs-mode: nil; tab-width: 4; coding: utf-8 -*-
#
# Copyright (c) 2004,2005 Canonical
#
# Author: Michael Vogt <michael.vogt@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.
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA
from __future__ import absolute_import, print_function
import apt
import apt_pkg
try:
import configparser
except ImportError:
import ConfigParser as configparser
try:
from http.client import BadStatusLine
except ImportError:
from httplib import BadStatusLine
import logging
import email.utils
import os
import socket
import sys
import time
import threading
try:
from urllib.parse import quote
from urllib.request import Request, urlopen
from urllib.error import HTTPError, URLError
except ImportError:
from urllib2 import HTTPError, Request, URLError, urlopen, quote
from .utils import (get_lang, get_dist, get_dist_version, get_ubuntu_flavor,
get_ubuntu_flavor_name)
class MetaReleaseParseError(Exception):
pass
class Dist(object):
def __init__(self, name, version, date, supported):
self.name = name
self.version = version
self.date = date
self.supported = supported
self.releaseNotesURI = None
self.releaseNotesHtmlUri = None
self.upgradeTool = None
self.upgradeToolSig = None
# the server may report that the upgrade is broken currently
self.upgrade_broken = None
class MetaReleaseCore(object):
"""
A MetaReleaseCore object abstracts the list of released
distributions.
"""
DEBUG = "DEBUG_UPDATE_MANAGER" in os.environ
# some constants
CONF = "/etc/update-manager/release-upgrades"
CONF_METARELEASE = "/etc/update-manager/meta-release"
def __init__(self,
useDevelopmentRelease=False,
useProposed=False,
forceLTS=False,
forceDownload=False,
cache=None):
self._debug("MetaRelease.__init__() useDevel=%s useProposed=%s" %
(useDevelopmentRelease, useProposed))
# force download instead of sending if-modified-since
self.forceDownload = forceDownload
self.useDevelopmentRelease = useDevelopmentRelease
# information about the available dists
self.downloaded = threading.Event()
self.upgradable_to = None
self.new_dist = None
if cache is None:
cache = apt.Cache()
self.flavor = get_ubuntu_flavor(cache=cache)
self.flavor_name = get_ubuntu_flavor_name(cache=cache)
self.current_dist_name = get_dist()
self.current_dist_version = get_dist_version()
self.no_longer_supported = None
# default (if the conf file is missing)
base_uri = "http://changelogs.ubuntu.com/"
self.METARELEASE_URI = base_uri + "meta-release"
self.METARELEASE_URI_LTS = base_uri + "meta-release-lts"
self.METARELEASE_URI_UNSTABLE_POSTFIX = "-development"
self.METARELEASE_URI_PROPOSED_POSTFIX = "-development"
# check the meta-release config first
parser = configparser.ConfigParser()
if os.path.exists(self.CONF_METARELEASE):
try:
parser.read(self.CONF_METARELEASE)
except configparser.Error as e:
sys.stderr.write("ERROR: failed to read '%s':\n%s" % (
self.CONF_METARELEASE, e))
return
# make changing the metarelease file and the location
# for the files easy
if parser.has_section("METARELEASE"):
sec = "METARELEASE"
for k in ["URI",
"URI_LTS",
"URI_UNSTABLE_POSTFIX",
"URI_PROPOSED_POSTFIX"]:
if parser.has_option(sec, k):
self._debug("%s: %s " % (self.CONF_METARELEASE,
parser.get(sec, k)))
setattr(self, "%s_%s" % (sec, k), parser.get(sec, k))
# check the config file first to figure if we want lts upgrades only
parser = configparser.ConfigParser()
if os.path.exists(self.CONF):
try:
parser.read(self.CONF)
except configparser.Error as e:
sys.stderr.write("ERROR: failed to read '%s':\n%s" % (
self.CONF, e))
return
# now check which specific url to use
if parser.has_option("DEFAULT", "Prompt"):
type = parser.get("DEFAULT", "Prompt").lower()
if (type == "never" or type == "no"):
# nothing to do for this object
# FIXME: what about no longer supported?
self.downloaded.set()
return
elif type == "lts":
self.METARELEASE_URI = self.METARELEASE_URI_LTS
# needed for the _tryUpgradeSelf() code in DistUpgradeController
if forceLTS:
self.METARELEASE_URI = self.METARELEASE_URI_LTS
# devel and proposed "just" change the postfix
if useDevelopmentRelease:
self.METARELEASE_URI += self.METARELEASE_URI_UNSTABLE_POSTFIX
elif useProposed:
self.METARELEASE_URI += self.METARELEASE_URI_PROPOSED_POSTFIX
self._debug("metarelease-uri: %s" % self.METARELEASE_URI)
self.metarelease_information = None
if not self._buildMetaReleaseFile():
self._debug("_buildMetaReleaseFile failed")
return
# we start the download thread here and we have a timeout
threading.Thread(target=self.download).start()
#threading.Thread(target=self.check).start()
def _buildMetaReleaseFile(self):
# build the metarelease_file name
self.METARELEASE_FILE = os.path.join(
"/var/lib/update-manager/",
os.path.basename(self.METARELEASE_URI))
# check if we can write to the global location, if not,
# write to homedir
try:
open(self.METARELEASE_FILE, "a").close()
except IOError as e:
cache_dir = os.getenv(
"XDG_CACHE_HOME", os.path.expanduser("~/.cache"))
# Take special care when creating this directory; ~/.cache needs
# to be created with mode 0700, but the other directories do
# not.
cache_parent_dir = os.path.split(cache_dir)[0]
if not os.path.exists(cache_parent_dir):
try:
os.makedirs(cache_parent_dir)
except OSError as e:
sys.stderr.write("mkdir() failed: '%s'" % e)
return False
if not os.path.exists(cache_dir):
try:
os.mkdir(cache_dir, 0o700)
except OSError as e:
sys.stderr.write("mkdir() failed: '%s'" % e)
return False
path = os.path.join(cache_dir, 'update-manager-core')
if not os.path.exists(path):
try:
os.mkdir(path)
except OSError as e:
sys.stderr.write("mkdir() failed: '%s'" % e)
return False
self.METARELEASE_FILE = os.path.join(
path,
os.path.basename(self.METARELEASE_URI))
# if it is empty, remove it to avoid I-M-S hits on empty file
try:
if os.path.getsize(self.METARELEASE_FILE) == 0:
os.unlink(self.METARELEASE_FILE)
except Exception as e:
pass
return True
def dist_no_longer_supported(self, dist):
""" virtual function that is called when the distro is no longer
supported
"""
self.no_longer_supported = dist
def new_dist_available(self, dist):
""" virtual function that is called when a new distro release
is available
"""
self.new_dist = dist
def parse(self):
self._debug("MetaRelease.parse()")
current_dist_name = self.current_dist_name
self._debug("current dist name: '%s'" % current_dist_name)
current_dist = None
dists = []
# parse the metarelease_information file
index_tag = apt_pkg.TagFile(self.metarelease_information)
while index_tag.step():
for required_key in ("Dist", "Version", "Supported", "Date"):
if required_key not in index_tag.section:
raise MetaReleaseParseError(
"Required key '%s' missing" % required_key)
name = index_tag.section["Dist"]
self._debug("found distro name: '%s'" % name)
rawdate = index_tag.section["Date"]
parseddate = list(email.utils.parsedate(rawdate))
parseddate[8] = 0 # assume no DST
date = time.mktime(tuple(parseddate))
supported = int(index_tag.section["Supported"])
version = index_tag.section["Version"]
# add the information to a new date object
dist = Dist(name, version, date, supported)
if "ReleaseNotes" in index_tag.section:
dist.releaseNotesURI = index_tag.section["ReleaseNotes"]
lang = get_lang()
if lang:
dist.releaseNotesURI += "?lang=%s" % lang
if "ReleaseNotesHtml" in index_tag.section:
dist.releaseNotesHtmlUri = index_tag.section[
"ReleaseNotesHtml"]
query = self._get_release_notes_uri_query_string(dist)
if query:
dist.releaseNotesHtmlUri += query
if "UpgradeTool" in index_tag.section:
dist.upgradeTool = index_tag.section["UpgradeTool"]
if "UpgradeToolSignature" in index_tag.section:
dist.upgradeToolSig = index_tag.section[
"UpgradeToolSignature"]
if "UpgradeBroken" in index_tag.section:
dist.upgrade_broken = index_tag.section["UpgradeBroken"]
dists.append(dist)
if name == current_dist_name:
current_dist = dist
self.metarelease_information.close()
self.metarelease_information = None
# first check if the current runing distro is in the meta-release
# information. if not, we assume that we run on something not
# supported and silently return
if current_dist is None:
self._debug("current dist not found in meta-release file\n")
return False
# then see what we can upgrade to
upgradable_to = ""
for dist in dists:
if dist.date > current_dist.date:
# Only offer to upgrade to an unsupported release if running
# with useDevelopmentRelease, this way one can upgrade from an
# LTS release to the next supported non-LTS release e.g. from
# 14.04 to 15.04.
if not dist.supported and not self.useDevelopmentRelease:
continue
upgradable_to = dist
self._debug("new dist: %s" % upgradable_to)
break
# only warn if unsupported and a new dist is available (because
# the development version is also unsupported)
if upgradable_to != "" and not current_dist.supported:
self.upgradable_to = upgradable_to
self.dist_no_longer_supported(current_dist)
if upgradable_to != "":
self.upgradable_to = upgradable_to
self.new_dist_available(upgradable_to)
# parsing done and sucessfully
return True
# the network thread that tries to fetch the meta-index file
# can't touch the gui, runs as a thread
def download(self):
self._debug("MetaRelease.download()")
lastmodified = 0
req = Request(self.METARELEASE_URI)
# make sure that we always get the latest file (#107716)
req.add_header("Cache-Control", "No-Cache")
req.add_header("Pragma", "no-cache")
if os.access(self.METARELEASE_FILE, os.W_OK):
try:
lastmodified = os.stat(self.METARELEASE_FILE).st_mtime
except OSError as e:
pass
if lastmodified > 0 and not self.forceDownload:
req.add_header("If-Modified-Since",
time.asctime(time.gmtime(lastmodified)))
try:
# open
uri = urlopen(req, timeout=20)
# sometime there is a root owned meta-relase file
# there, try to remove it so that we get it
# with proper permissions
if (os.path.exists(self.METARELEASE_FILE) and
not os.access(self.METARELEASE_FILE, os.W_OK)):
try:
os.unlink(self.METARELEASE_FILE)
except OSError as e:
print("Can't unlink '%s' (%s)" % (self.METARELEASE_FILE,
e))
# we may get exception here on e.g. disk full
try:
f = open(self.METARELEASE_FILE, "w+")
for line in uri.readlines():
f.write(line.decode("UTF-8"))
f.flush()
f.seek(0, 0)
self.metarelease_information = f
except IOError as e:
pass
uri.close()
# http error
except HTTPError as e:
# mvo: only reuse local info on "not-modified"
if e.code == 304 and os.path.exists(self.METARELEASE_FILE):
self._debug("reading file '%s'" % self.METARELEASE_FILE)
self.metarelease_information = open(self.METARELEASE_FILE, "r")
else:
self._debug("result of meta-release download: '%s'" % e)
# generic network error
except (URLError, BadStatusLine, socket.timeout) as e:
self._debug("result of meta-release download: '%s'" % e)
# now check the information we have
if self.metarelease_information is not None:
self._debug("have self.metarelease_information")
try:
self.parse()
except:
logging.exception("parse failed for '%s'" %
self.METARELEASE_FILE)
# no use keeping a broken file around
os.remove(self.METARELEASE_FILE)
# we don't want to keep a meta-release file around when it
# has a "Broken" flag, this ensures we are not bitten by
# I-M-S/cache issues
if self.new_dist and self.new_dist.upgrade_broken:
os.remove(self.METARELEASE_FILE)
else:
self._debug("NO self.metarelease_information")
self.downloaded.set()
@property
def downloading(self):
return not self.downloaded.is_set()
def _get_release_notes_uri_query_string(self, dist):
q = "?"
# get the lang
lang = get_lang()
if lang:
q += "lang=%s&" % lang
# get the os
q += "os=%s&" % self.flavor
# get the version to upgrade to
q += "ver=%s" % dist.version
# the archive didn't respond well to ? being %3F
return quote(q, '/?')
def _debug(self, msg):
if self.DEBUG:
sys.stderr.write(msg + "\n")
if __name__ == "__main__":
meta = MetaReleaseCore(False, False)
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