| Current File : //usr/lib/python3/dist-packages/UpdateManager/Core/MyCache.py |
# MyCache.py
# -*- Mode: Python; indent-tabs-mode: nil; tab-width: 4; coding: utf-8 -*-
#
# Copyright (c) 2004-2008 Canonical
#
# Author: Michael Vogt <mvo@debian.org>
#
# 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 warnings
warnings.filterwarnings("ignore", "apt API not stable yet", FutureWarning)
import apt
import apt_pkg
import logging
import os
from urllib.error import HTTPError
from urllib.request import urlopen
from urllib.parse import urlsplit
from http.client import BadStatusLine
import socket
import subprocess
import re
import DistUpgrade.DistUpgradeCache
from gettext import gettext as _
try:
from launchpadlib.launchpad import Launchpad
except ImportError:
Launchpad = None
SYNAPTIC_PINFILE = "/var/lib/synaptic/preferences"
CHANGELOGS_POOL = "https://changelogs.ubuntu.com/changelogs/pool/"
CHANGELOGS_URI = CHANGELOGS_POOL + "%s/%s/%s/%s_%s/%s"
class HttpsChangelogsUnsupportedError(Exception):
"""https changelogs with credentials are unsupported because of the
lack of certitifcation validation in urllib2 which allows MITM
attacks to steal the credentials
"""
pass
class MyCache(DistUpgrade.DistUpgradeCache.MyCache):
CHANGELOG_ORIGIN = "Ubuntu"
def __init__(self, progress, rootdir=None):
apt.Cache.__init__(self, progress, rootdir)
# save for later
self.rootdir = rootdir
# raise if we have packages in reqreinst state
# and let the caller deal with that (runs partial upgrade)
assert len(self.req_reinstall_pkgs) == 0
# check if the dpkg journal is ok (we need to do that here
# too because libapt will only do it when it tries to lock
# the packaging system)
assert not self._dpkgJournalDirty()
# init the regular cache
self._initDepCache()
self.all_changes = {}
self.all_news = {}
self.pro_versions = {}
# on broken packages, try to fix via saveDistUpgrade()
if self._depcache.broken_count > 0:
self.saveDistUpgrade()
assert (
self._depcache.broken_count == 0 and self._depcache.del_count == 0
)
self.launchpad = None
# generate versioned_kernel_pkgs_regexp for later use
apt_versioned_kernel_pkgs = apt_pkg.config.value_list(
"APT::VersionedKernelPackages"
)
if apt_versioned_kernel_pkgs:
self.versioned_kernel_pkgs_regexp = re.compile(
"("
+ "|".join(["^" + p for p in apt_versioned_kernel_pkgs])
+ ")"
)
running_kernel_version = subprocess.check_output(
["uname", "-r"], universal_newlines=True
).rstrip()
self.running_kernel_pkgs_regexp = re.compile(
"("
+ "|".join(
[
("^" + p + ".*" + running_kernel_version)
if not p.startswith(".*")
else (running_kernel_version + p)
for p in apt_versioned_kernel_pkgs
]
)
+ ")"
)
else:
self.versioned_kernel_pkgs_regexp = None
self.running_kernel_pkgs_regexp = None
def _dpkgJournalDirty(self):
"""
test if the dpkg journal is dirty
(similar to debSystem::CheckUpdates)
"""
d = (
os.path.dirname(apt_pkg.config.find_file("Dir::State::status"))
+ "/updates"
)
for f in os.listdir(d):
if re.match("[0-9]+", f):
return True
return False
def _initDepCache(self):
# apt_pkg.config.set("Debug::pkgPolicy","1")
# self.depcache = apt_pkg.GetDepCache(self.cache)
# self._depcache = apt_pkg.GetDepCache(self._cache)
self._depcache.read_pinfile()
if os.path.exists(SYNAPTIC_PINFILE):
self._depcache.read_pinfile(SYNAPTIC_PINFILE)
self._depcache.init()
def clear(self):
self._initDepCache()
@property
def required_download(self):
"""get the size of the packages that are required to download"""
pm = apt_pkg.PackageManager(self._depcache)
fetcher = apt_pkg.Acquire()
pm.get_archives(fetcher, self._list, self._records)
return fetcher.fetch_needed
@property
def install_count(self):
return self._depcache.inst_count
def keep_count(self):
return self._depcache.keep_count
@property
def del_count(self):
return self._depcache.del_count
def _check_dependencies(self, target, deps):
"""Return True if any of the dependencies in deps match target."""
# TODO: handle virtual packages
for dep_or in deps:
if not dep_or:
continue
match = True
for base_dep in dep_or:
if (
base_dep.name != target.package.shortname
or not apt_pkg.check_dep(
target.version, base_dep.relation, base_dep.version
)
):
match = False
if match:
return True
return False
def find_removal_justification(self, pkg):
target = pkg.installed
if not target:
return False
for cpkg in self:
candidate = cpkg.candidate
if candidate is not None:
if self._check_dependencies(
target, candidate.get_dependencies("Conflicts")
) and self._check_dependencies(
target, candidate.get_dependencies("Replaces")
):
logging.info(
"%s Conflicts/Replaces %s; allowing removal"
% (candidate.package.shortname, pkg.shortname)
)
return True
return False
def saveDistUpgrade(self):
"""this functions mimics a upgrade but will never remove anything"""
# self._apply_dselect_upgrade()
self._depcache.upgrade(True)
wouldDelete = self._depcache.del_count
if wouldDelete > 0:
deleted_pkgs = [pkg for pkg in self if pkg.marked_delete]
assert wouldDelete == len(deleted_pkgs)
for pkg in deleted_pkgs:
if self.find_removal_justification(pkg):
wouldDelete -= 1
if wouldDelete > 0:
self.clear()
assert (
self._depcache.broken_count == 0
and self._depcache.del_count == 0
)
else:
assert self._depcache.broken_count == 0
# self._apply_dselect_upgrade()
self._depcache.upgrade()
return wouldDelete
def _strip_epoch(self, verstr):
"strip of the epoch"
vers_no_epoch = verstr.split(":")
if len(vers_no_epoch) > 1:
verstr = "".join(vers_no_epoch[1:])
return verstr
def _get_changelog_or_news(
self, name, fname, strict_versioning=False, changelogs_uri=None
):
"helper that fetches the file in question"
# don't touch the gui in this function, it needs to be thread-safe
pkg = self[name]
# get the src package name
srcpkg = pkg.candidate.source_name
# assume "main" section
src_section = "main"
# use the section of the candidate as a starting point
section = pkg._pcache._depcache.get_candidate_ver(pkg._pkg).section
# get the source version
srcver_epoch = pkg.candidate.source_version
srcver = self._strip_epoch(srcver_epoch)
split_section = section.split("/")
if len(split_section) > 1:
src_section = split_section[0]
# lib is handled special
prefix = srcpkg[0]
if srcpkg.startswith("lib"):
prefix = "lib" + srcpkg[3]
# the changelogs_uri argument overrides the default changelogs_uri,
# this is useful for e.g. PPAs where we construct the changelogs
# path differently
if changelogs_uri:
uri = changelogs_uri
else:
uri = CHANGELOGS_URI % (
src_section,
prefix,
srcpkg,
srcpkg,
srcver,
fname,
)
# https uris are not supported when they contain a username/password
# because the urllib2 https implementation will not check certificates
# and so its possible to do a man-in-the-middle attack to steal the
# credentials
res = urlsplit(uri)
if res.scheme == "https" and res.username:
raise HttpsChangelogsUnsupportedError(
"https locations with username/password are not"
"supported to fetch changelogs"
)
# print("Trying: %s " % uri)
changelog = urlopen(uri)
# print(changelog.read())
# do only get the lines that are new
alllines = ""
regexp = "^%s \\((.*)\\)(.*)$" % (re.escape(srcpkg))
while True:
line = changelog.readline().decode("UTF-8", "replace")
if line == "":
break
match = re.match(regexp, line)
if match:
# strip epoch from installed version
# and from changelog too
installed = getattr(pkg.installed, "version", None)
if installed and ":" in installed:
installed = installed.split(":", 1)[1]
changelogver = match.group(1)
if changelogver and ":" in changelogver:
changelogver = changelogver.split(":", 1)[1]
# we test for "==" here for changelogs
# to ensure that the version
# is actually really in the changelog - if not
# just display it all, this catches cases like:
# gcc-defaults with "binver=4.3.1" and srcver=1.76
#
# for NEWS.Debian we do require the changelogver > installed
if strict_versioning:
if (
installed
and apt_pkg.version_compare(changelogver, installed)
< 0
):
break
else:
if (
installed
and apt_pkg.version_compare(changelogver, installed)
== 0
):
break
alllines = alllines + line
return alllines
def _extract_ppa_changelog_uri(self, name):
"""Return the changelog URI from the Launchpad API
Return None in case of an error.
"""
if not Launchpad:
logging.warning(
"Launchpadlib not available, cannot retrieve PPA changelog"
)
return None
cdt = self[name].candidate
for uri in cdt.uris:
if urlsplit(uri).hostname not in (
"ppa.launchpad.net",
"ppa.launchpadcontent.net",
):
continue
match = re.search("http.*/(.*)/(.*)/ubuntu/.*", uri)
if match is not None:
user, ppa = match.group(1), match.group(2)
break
else:
logging.error("Unable to find a valid PPA candidate URL.")
return
# Login on launchpad if we are not already
if self.launchpad is None:
self.launchpad = Launchpad.login_anonymously(
"update-manager", "production", version="devel"
)
archive = self.launchpad.archives.getByReference(
reference="~%s/ubuntu/%s" % (user, ppa)
)
if archive is None:
logging.error(
"Unable to retrieve the archive from the Launchpad API."
)
return
spphs = archive.getPublishedSources(
source_name=cdt.source_name,
exact_match=True,
version=cdt.source_version,
)
if not spphs:
logging.error(
"No published sources were retrieved from the "
"Launchpad API."
)
return
return spphs[0].changelogUrl()
def _guess_third_party_changelogs_uri_by_source(self, name):
pkg = self[name]
deb_uri = pkg.candidate.uri
if deb_uri is None:
return None
srcrec = pkg.candidate.record.get("Source")
if not srcrec:
return None
# srcpkg can be "apt" or "gcc-default (1.0)"
srcpkg = srcrec.split("(")[0].strip()
if "(" in srcrec:
srcver = srcrec.split("(")[1].rstrip(")")
else:
srcver = pkg.candidate.source_version
base_uri = deb_uri.rpartition("/")[0]
return base_uri + "/%s_%s.changelog" % (srcpkg, srcver)
def _guess_third_party_changelogs_uri_by_binary(self, name):
"""guess changelogs uri based on ArchiveURI by replacing .deb
with .changelog
"""
# there is always a pkg and a pkg.candidate, no need to add
# check here
pkg = self[name]
deb_uri = pkg.candidate.uri
if deb_uri:
return "%s.changelog" % deb_uri.rsplit(".", 1)[0]
return None
def get_news_and_changelog(self, name, lock):
self.get_news(name)
self.get_changelog(name)
try:
lock.release()
except Exception:
pass
def get_news(self, name):
"get the NEWS.Debian file from the changelogs location"
try:
news = self._get_changelog_or_news(name, "NEWS.Debian", True)
except Exception:
return
if news:
self.all_news[name] = news
def _fetch_changelog_for_third_party_package(self, name, origins):
# Special case for PPAs
changelogs_uri_ppa = None
for origin in origins:
if origin.origin.startswith("LP-PPA-"):
try:
changelogs_uri_ppa = self._extract_ppa_changelog_uri(name)
break
except Exception:
logging.exception(
"Unable to connect to the Launchpad API."
)
# Try non official changelog location
changelogs_uri_binary = (
self._guess_third_party_changelogs_uri_by_binary(name)
)
changelogs_uri_source = (
self._guess_third_party_changelogs_uri_by_source(name)
)
error_message = ""
for changelogs_uri in [
changelogs_uri_ppa,
changelogs_uri_binary,
changelogs_uri_source,
]:
if changelogs_uri:
try:
changelog = self._get_changelog_or_news(
name, "changelog", False, changelogs_uri
)
self.all_changes[name] += changelog
except (HTTPError, HttpsChangelogsUnsupportedError):
# no changelogs_uri or 404
error_message = _(
"This update does not come from a "
"source that supports changelogs."
)
except (IOError, BadStatusLine, socket.error):
# network errors and others
logging.exception("error on changelog fetching")
error_message = _(
"Failed to download the list of changes. \n"
"Please check your Internet connection."
)
self.all_changes[name] += error_message
# If the machine is not attached to Ubuntu Pro, Update Manager advertises
# the upgrades that would be available if it were attached.
# As that is unbeknownst to Apt, we need this map to show the correct
# version of each upgradable-if-pro-subscribed package.
def create_pro_cache(self, pro_pkgs):
for (name, version, _a, _a) in pro_pkgs:
self.pro_versions[name] = version
def get_changelog(self, name):
"get the changelog file from the changelog location"
origins = self[name].candidate.origins
version = self.pro_versions.get(name, self[name].candidate.version)
self.all_changes[name] = _(
"Changes for %s versions:\n"
"Installed version: %s\n"
"Available version: %s\n\n"
) % (
name,
getattr(self[name].installed, "version", None),
version,
)
if self.CHANGELOG_ORIGIN not in [o.origin for o in origins]:
self._fetch_changelog_for_third_party_package(name, origins)
return
# fixup epoch handling version
srcpkg = self[name].candidate.source_name
srcver_epoch = self[name].candidate.source_version.replace(":", "%3A")
try:
changelog = self._get_changelog_or_news(name, "changelog")
if len(changelog) == 0:
changelog = _(
"The changelog does not contain any relevant changes.\n\n"
"Please use http://launchpad.net/ubuntu/+source/"
"%s/%s/+changelog\n"
"until the changes become available or try again later."
) % (srcpkg, srcver_epoch)
except HTTPError:
changelog = _(
"The list of changes is not available yet.\n\n"
"Please use http://launchpad.net/ubuntu/+source/"
"%s/%s/+changelog\n"
"until the changes become available or try again later."
) % (srcpkg, srcver_epoch)
except (IOError, BadStatusLine, socket.error) as e:
print("caught exception: ", e)
changelog = _(
"Failed to download the list of changes. \n"
"Please check your Internet connection."
)
self.all_changes[name] += changelog