Current File : //lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py
# MetaRelease.py
# -*- 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
import apt
import apt_pkg
import distro_info
import configparser
from http.client import BadStatusLine
import logging
import email.utils
import os
import socket
import sys
import time
import threading
from urllib.parse import quote
from urllib.request import Request, urlopen
from urllib.error import HTTPError, URLError
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,
debug=False,
forceLTS=False,
forceDownload=False,
cache=None,
):
if debug:
self.DEBUG = True
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
self.prompt = None
# default (if the conf file is missing)
base_uri = "https://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 = "-proposed"
# 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"):
prompt = parser.get("DEFAULT", "Prompt").lower()
if prompt == "never" or prompt == "no":
self.prompt = "never"
# nothing to do for this object
# FIXME: what about no longer supported?
self.downloaded.set()
return
elif prompt == "lts":
self.prompt = "lts"
# the Prompt=lts setting only makes sense when running on
# a LTS, otherwise it would result in users not receiving
# any distro upgrades
di = distro_info.UbuntuDistroInfo()
if di.is_lts(self.current_dist_name):
self.METARELEASE_URI = self.METARELEASE_URI_LTS
else:
self._debug("Prompt=lts for non-LTS, ignoring")
else:
self.prompt = "normal"
# 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:
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:
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)
try:
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
except apt_pkg.Error:
raise MetaReleaseParseError(
"Unable to parse %s" % self.METARELEASE_URI
)
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:
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:
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)
print(
"Failed to connect to %s. Check your Internet connection "
"or proxy settings" % self.METARELEASE_URI
)
# now check the information we have
if self.metarelease_information is not None:
self._debug("have self.metarelease_information")
try:
self.parse()
except Exception:
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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