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|
# DistUpgradeControler.py
#
# 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 sys
import os
import subprocess
import logging
import re
import statvfs
from DistUpgradeConfigParser import DistUpgradeConfig
from aptsources import SourcesList, SourceEntry, is_mirror
from gettext import gettext as _
from DistUpgradeCache import MyCache
class DistUpgradeControler(object):
def __init__(self, distUpgradeView):
self._view = distUpgradeView
self._view.updateStatus(_("Reading cache"))
self.cache = None
self.config = DistUpgradeConfig()
self.sources_backup_ext = "."+self.config.get("Files","BackupExt")
# some constants here
self.fromDist = self.config.get("Sources","From")
self.toDist = self.config.get("Sources","To")
self.origin = self.config.get("Sources","ValidOrigin")
# forced obsoletes
self.forced_obsoletes = self.config.getlist("Distro","ForcedObsoletes")
# turn on debuging in the cache
apt_pkg.Config.Set("Debug::pkgProblemResolver","true")
fd = os.open("/var/log/dist-upgrade-apt.log",
os.O_RDWR|os.O_CREAT|os.O_TRUNC)
os.dup2(fd,1)
os.dup2(fd,2)
def openCache(self):
self.cache = MyCache(self._view.getOpCacheProgress())
def rewriteSourcesList(self, mirror_check=True):
logging.debug("rewriteSourcesList()")
# this must map, i.e. second in "from" must be the second in "to"
# (but they can be different, so in theory we could exchange
# component names here)
fromDists = [self.fromDist,
self.fromDist+"-security",
self.fromDist+"-updates",
self.fromDist+"-backports"
]
toDists = [self.toDist,
self.toDist+"-security",
self.toDist+"-updates",
self.toDist+"-backports"
]
# list of valid mirrors that we can add
valid_mirrors = self.config.getListFromFile("Sources","ValidMirrors")
self.sources_disabled = False
# look over the stuff we have
foundToDist = False
for entry in self.sources:
# ignore invalid records (but update disabled ones)
# or cdrom entries
if entry.invalid or entry.uri.startswith("cdrom:") or entry.disabled:
continue
logging.debug("examining: '%s'" % entry)
# check if it's a mirror (or offical site)
validMirror = False
for mirror in valid_mirrors:
if not mirror_check or is_mirror(mirror,entry.uri):
validMirror = True
# security is a special case
res = not entry.uri.startswith("http://security.ubuntu.com") and not entry.disabled
if entry.dist in toDists:
# so the self.sources.list is already set to the new
# distro
logging.debug("entry '%s' is already set to new dist" % entry)
foundToDist |= res
elif entry.dist in fromDists:
foundToDist |= res
entry.dist = toDists[fromDists.index(entry.dist)]
logging.debug("entry '%s' updated to new dist" % entry)
else:
# disable all entries that are official but don't
# point to either "to" or "from" dist
entry.disabled = True
self.sources_disabled = True
logging.debug("entry '%s' was disabled (unknown dist)" % entry)
# it can only be one valid mirror, so we can break here
break
# disable anything that is not from a official mirror
if not validMirror:
entry.disabled = True
self.sources_disabled = True
logging.debug("entry '%s' was disabled (unknown mirror)" % entry)
return foundToDist
def updateSourcesList(self):
logging.debug("updateSourcesList()")
self.sources = SourcesList()
if not self.rewriteSourcesList(mirror_check=True):
logging.error("No valid mirror found")
res = self._view.askYesNoQuestion(_("No valid mirror found"),
_("While scaning your repository "
"information no mirror entry for "
"the upgrade was found."
"This cam happen if you run a internal "
"mirror or if the mirror information is "
"out of date.\n\n"
"Do you want to rewrite your "
"'sources.list' file anyway? If you choose "
"'Yes' here it will update all '%s' to '%s' "
"entries.\n"
"If you select 'no' the update will cancel."
) % (self.fromDist, self.toDist))
if res:
# re-init the sources and try again
self.sources = SourcesList()
if not self.rewriteSourcesList(mirror_check=False):
#hm, still nothing useful ...
prim = _("Generate default sources?")
secon = _("After scanning your 'sources.list' no "
"valid entry for '%s' was found.\n\n"
"Should default entries for '%s' be "
"added? If you select 'No' the update "
"will cancel.") % (self.fromDist, self.toDist)
if not self._view.askYesNoQuestion(prim, secon):
self.abort()
# add some defaults here
# FIXME: find mirror here
uri = "http://archive.ubuntu.com/ubuntu"
comps = ["main","restricted"]
self.sources.add("deb", uri, self.toDist, comps)
self.sources.add("deb", uri, self.toDist+"-updates", comps)
self.sources.add("deb",
"http://security.ubuntu.com/ubuntu/",
self.toDist+"-security", comps)
else:
self.abort()
# write (well, backup first ;) !
self.sources.backup(self.sources_backup_ext)
self.sources.save()
# re-check if the written self.sources are valid, if not revert and
# bail out
# TODO: check if some main packages are still available or if we
# accidently shot them, if not, maybe offer to write a standard
# sources.list?
try:
sourceslist = apt_pkg.GetPkgSourceList()
sourceslist.ReadMainList()
except SystemError:
logging.error("Repository information invalid after updating (we broke it!)")
self._view.error(_("Repository information invalid"),
_("Upgrading the repository information "
"resulted in a invalid file. Please "
"report this as a bug."))
return False
if self.sources_disabled:
self._view.information(_("Third party sources disabled"),
_("Some third party entries in your souces.list "
"where disabled. You can re-enable them "
"after the upgrade with the "
"'software-properties' tool or with synaptic."
))
return True
def _logChanges(self):
# debuging output
logging.debug("About to apply the following changes")
inst = []
up = []
rm = []
for pkg in self.cache:
if pkg.markedInstall: inst.append(pkg.name)
elif pkg.markedUpgrade: up.append(pkg.name)
elif pkg.markedDelete: rm.append(pkg.name)
logging.debug("Remove: %s" % " ".join(rm))
logging.debug("Install: %s" % " ".join(inst))
logging.debug("Upgrade: %s" % " ".join(up))
def doPreUpdate(self):
# FIXME: check out what packages are downloadable etc to
# compare the list after the update again
self.obsolete_pkgs = self.cache._getObsoletesPkgs()
self.foreign_pkgs = self.cache._getForeignPkgs(self.origin, self.fromDist, self.toDist)
logging.debug("Foreign: %s" % " ".join(self.foreign_pkgs))
logging.debug("Obsolete: %s" % " ".join(self.obsolete_pkgs))
def doUpdate(self):
self.cache._list.ReadMainList()
progress = self._view.getFetchProgress()
# FIXME: retry here too? just like the DoDistUpgrade?
# also remove all files from the lists partial dir!
currentRetry = 0
maxRetries = int(self.config.get("Network","MaxRetries"))
while currentRetry < maxRetries:
try:
res = self.cache.update(progress)
except IOError, e:
logging.error("IOError in cache.update(): '%s'. Retrying (currentRetry: %s)" % (e,currentRetry))
currentRetry += 1
continue
# no exception, so all was fine, we are done
return True
self._view.error(_("Error during update"),
_("A problem occured during the update. "
"This is usually some sort of network "
"problem, please check your network "
"connection and retry."), "%s" % e)
return False
def _checkFreeSpace(self):
" this checks if we have enough free space on /var and /usr"
err_sum = _("Not enough free disk space")
err_long= _("The upgrade aborts now. "
"Please free at least %s of disk space on %s. "
"Empty your trash and remove temporary "
"packages of former installations using "
"'sudo apt-get clean'.")
# first check for /var (or where the archives are downloaded too)
archivedir = apt_pkg.Config.FindDir("Dir::Cache::archives")
st_archivedir = os.statvfs(archivedir)
free = st_archivedir[statvfs.F_BAVAIL]*st_archivedir[statvfs.F_FRSIZE]
logging.debug("required download: %s " % self.cache.requiredDownload)
logging.debug("free on %s: %s " % (archivedir, free))
if self.cache.requiredDownload > free:
free_at_least = apt_pkg.SizeToStr(self.cache.requiredDownload-free)
self._view.error(err_sum, err_long % (free_at_least,archivedir))
return False
# then check for /usr assuming that all the data goes into /usr
# this won't catch space problems when e.g. /boot,/usr/,/ are all
# seperated partitions, but with a fragmented
# patition layout we can't do a lot better because we don't know
# the space-requirements on a per dir basis inside the deb without
# looking into each
logging.debug("need additional space: %s" % self.cache.additionalRequiredSpace)
dir = "/usr"
st_usr = os.statvfs(dir)
if st_archivedir == st_usr:
# we are on the same filesystem, so we need to take the space
# for downloading the debs into account
free -= self.cache.additionalRequiredSpace
logging.debug("/usr on same fs as %s, taking dl-size into account, new free: %s" % (archivedir, free))
else:
free = st_usr[statvfs.F_BAVAIL]*st_usr[statvfs.F_FRSIZE]
logging.debug("/usr on different fs than %s, free: %s" % (archivedir, free))
if self.cache.additionalRequiredSpace > free:
free_at_least = apt_pkg.SizeToStr(self.cache.additionalRequiredSpace-free)
logging.error("not enough free space, we need addional %s" % free_at_least)
self._view.error(err_sum, err_long % (free_at_least,dir))
return False
# FIXME: we should try to esitmate if "/" has enough free space,
# linux-restricted-modules and linux-image- are both putting there
# modules there and those take a lot of space
return True
def askDistUpgrade(self):
if not self.cache.distUpgrade(self._view):
return False
changes = self.cache.getChanges()
# log the changes for debuging
self._logChanges()
# check if we have enough free space
if not self._checkFreeSpace():
return False
# ask the user if he wants to do the changes
res = self._view.confirmChanges(_("Do you want to start the upgrade?"),
changes,
self.cache.requiredDownload)
return res
def doDistUpgrade(self):
currentRetry = 0
fprogress = self._view.getFetchProgress()
iprogress = self._view.getInstallProgress()
# retry the fetching in case of errors
maxRetries = int(self.config.get("Network","MaxRetries"))
while currentRetry < maxRetries:
try:
res = self.cache.commit(fprogress,iprogress)
except SystemError, e:
# installing the packages failed, can't be retried
self._view.getTerminal().call(["dpkg","--configure","-a"])
self._view.error(_("Could not install the upgrades"),
_("The upgrade aborts now. Your system "
"can be in an unusable state. A recovery "
"was run (dpkg --configure -a)."),
"%s" % e)
return False
except IOError, e:
# fetch failed, will be retried
logging.error("IOError in cache.commit(): '%s'. Retrying (currentTry: %s)" % (e,currentRetry))
currentRetry += 1
continue
# no exception, so all was fine, we are done
return True
# maximum fetch-retries reached without a successful commit
logging.debug("giving up on fetching after maximum retries")
self._view.error(_("Could not download the upgrades"),
_("The upgrade aborts now. Please check your "\
"internet connection or "\
"installation media and try again. "),
"%s" % e)
# abort here because we want our sources.list back
self.abort()
def doPostUpgrade(self):
self.openCache()
# check out what packages are cruft now
# use self.{foreign,obsolete}_pkgs here and see what changed
now_obsolete = self.cache._getObsoletesPkgs()
now_foreign = self.cache._getForeignPkgs(self.origin, self.fromDist, self.toDist)
logging.debug("Obsolete: %s" % " ".join(now_obsolete))
logging.debug("Foreign: %s" % " ".join(now_foreign))
# now get the meta-pkg specific obsoletes and purges
for pkg in self.config.getlist("Distro","MetaPkgs"):
if self.cache.has_key(pkg) and self.cache[pkg].isInstalled:
self.forced_obsoletes.extend(self.config.getlist(pkg,"ForcedObsoletes"))
logging.debug("forced_obsoletes: %s", self.forced_obsoletes)
# check what packages got demoted
demotions_file = self.config.get("Distro","Demotions")
demotions = set()
if os.path.exists(demotions_file):
map(lambda pkgname: demotions.add(pkgname.strip()),
filter(lambda line: not line.startswith("#"),
open(demotions_file).readlines()))
installed_demotions = filter(lambda pkg: pkg.isInstalled and pkg.name in demotions, self.cache)
if len(installed_demotions) > 0:
self._view.information(_("Some software no longer officially "
"supported"),
_("These installed packages are "
"no longer officially supported, "
"and are now only "
"community-supported ('universe').\n\n"
"If you don't have 'universe' enabled "
"these packages will be suggested for "
"removal in the next step. "),
"\n".join([pkg.name for pkg in installed_demotions]))
# mark packages that are now obsolete (and where not obsolete
# before) to be deleted. make sure to not delete any foreign
# (that is, not from ubuntu) packages
remove_candidates = now_obsolete - self.obsolete_pkgs
remove_candidates |= set(self.forced_obsoletes)
logging.debug("remove_candidates: '%s'" % remove_candidates)
logging.debug("Start checking for obsolete pkgs")
for pkgname in remove_candidates:
if pkgname not in self.foreign_pkgs:
if not self.cache._tryMarkObsoleteForRemoval(pkgname, remove_candidates, self.foreign_pkgs):
logging.debug("'%s' scheduled for remove but not in remove_candiates, skipping", pkgname)
logging.debug("Finish checking for obsolete pkgs")
# get changes
changes = self.cache.getChanges()
logging.debug("The following packages are remove candidates: %s" % " ".join([pkg.name for pkg in changes]))
summary = _("Remove obsolete packages?")
actions = [_("_Skip This Step"), _("_Remove")]
# FIXME Add an explanation about what obsolete pacages are
#explanation = _("")
if len(changes) > 0 and \
self._view.confirmChanges(summary, changes, 0, actions):
fprogress = self._view.getFetchProgress()
iprogress = self._view.getInstallProgress()
try:
res = self.cache.commit(fprogress,iprogress)
except (SystemError, IOError), e:
self._view.error(_("Error during commit"),
_("Some problem occured during the clean-up. "
"Please see the below message for more "
"information. "),
"%s" % e)
def abort(self):
""" abort the upgrade, cleanup (as much as possible) """
self.sources.restoreBackup(self.sources_backup_ext)
# generate a new cache
self._view.updateStatus(_("Restoring originale system state"))
self.openCache()
sys.exit(1)
# this is the core
def dapperUpgrade(self):
# sanity check (check for ubuntu-desktop, brokenCache etc)
self._view.updateStatus(_("Checking package manager"))
self._view.setStep(1)
self.openCache()
if not self.cache.sanityCheck(self._view):
abort(1)
# run a "apt-get update" now
if not self.doUpdate():
self.abort()
# do pre-upgrade stuff (calc list of obsolete pkgs etc)
self.doPreUpdate()
# update sources.list
self._view.setStep(2)
self._view.updateStatus(_("Updating repository information"))
if not self.updateSourcesList():
self.abort()
# then update the package index files
if not self.doUpdate():
self.abort()
# then open the cache (again)
self._view.updateStatus(_("Checking package manager"))
self.openCache()
# now check if we still have some key packages after the update
# if not something went seriously wrong
for pkg in self.config.getlist("Distro","BaseMetaPkgs"):
if not self.cache.has_key(pkg):
# FIXME: we could offer to add default source entries here,
# but we need to be careful to not duplicate them
# (i.e. the error here could be something else than
# missing sources entires but network errors etc)
logging.error("No '%s' after sources.list rewrite+update")
self._view.error(_("Invalid package information"),
_("After your package information was "
"updated the essential package '%s' can "
"not be found anymore.\n"
"This indicates a serious error, please "
"report this as a bug.") % pkg)
self.abort()
# calc the dist-upgrade and see if the removals are ok/expected
# do the dist-upgrade
self._view.setStep(3)
self._view.updateStatus(_("Asking for confirmation"))
if not self.askDistUpgrade():
self.abort()
self._view.updateStatus(_("Upgrading"))
if not self.doDistUpgrade():
# don't abort here, because it would restore the sources.list
sys.exit(1)
# do post-upgrade stuff
self._view.setStep(4)
self._view.updateStatus(_("Searching for obsolete software"))
self.doPostUpgrade()
# done, ask for reboot
self._view.setStep(5)
self._view.updateStatus(_("System upgrade is complete."))
# FIXME should we look into /var/run/reboot-required here?
if self._view.confirmRestart():
subprocess.call(["reboot"])
def run(self):
self.dapperUpgrade()
|
