Current File : //usr/lib/python3/dist-packages/UpdateManager/backend/__init__.py
#!/usr/bin/env python
# -*- Mode: Python; indent-tabs-mode: nil; tab-width: 4; coding: utf-8 -*-
"""Integration of package managers into UpdateManager"""
# (c) 2005-2009 Canonical, GPL
from __future__ import absolute_import
from gi.repository import GLib
from apt import Cache
import os
from UpdateManager.Core.utils import inhibit_sleep
from UpdateManager.Dialogs import Dialog
class InstallBackend(Dialog):
ACTION_UPDATE = 0
ACTION_INSTALL = 1
def __init__(self, window_main, action):
Dialog.__init__(self, window_main)
self.action = action
self.sleep_cookie = None
def start(self):
os.environ["APT_LISTCHANGES_FRONTEND"] = "none"
# Do not suspend during the update process
self.sleep_cookie = inhibit_sleep()
if self.action == self.ACTION_INSTALL:
# Get the packages which should be installed and update
pkgs_install = []
pkgs_upgrade = []
pkgs_remove = []
# Get a fresh cache in case update-manager's is outdated to
# skip operations that already took place
fresh_cache = Cache(rootdir=self.window_main.cache.rootdir)
for pkg in self.window_main.cache:
try:
if pkg.marked_install \
and not fresh_cache[pkg.name].is_installed:
pkgname = pkg.name
if pkg.is_auto_installed:
pkgname += "#auto"
pkgs_install.append(pkgname)
elif (pkg.marked_upgrade
and fresh_cache[pkg.name].is_upgradable):
pkgs_upgrade.append(pkg.name)
elif (pkg.marked_delete
and fresh_cache[pkg.name].is_installed):
pkgs_remove.append(pkg.name)
except KeyError:
# pkg missing from fresh_cache can't be modified
pass
self.commit(pkgs_install, pkgs_upgrade, pkgs_remove)
else:
self.update()
def update(self):
"""Run a update to refresh the package list"""
raise NotImplemented
def commit(self, pkgs_install, pkgs_upgrade, pkgs_remove):
"""Commit the cache changes """
raise NotImplemented
def _action_done(self, action, authorized, success, error_string,
error_desc, trans_failed=False):
# If the progress dialog should be closed automatically afterwards
#settings = Gio.Settings.new("com.ubuntu.update-manager")
#close_after_install = settings.get_boolean(
# "autoclose-install-window")
# FIXME: confirm with mpt whether this should still be a setting
#close_after_install = False
if action == self.ACTION_INSTALL:
if success:
self.window_main.start_available()
elif error_string:
self.window_main.start_error(trans_failed, error_string,
error_desc)
else:
# exit gracefuly, we can't just exit as this will trigger
# a crash if system.exit() is called in a exception handler
GLib.timeout_add(1, self.window_main.exit)
else:
if error_string:
self.window_main.start_error(True, error_string, error_desc)
else:
is_cancelled_update = not success
self.window_main.start_available(is_cancelled_update)
# try aptdaemon
if os.path.exists("/usr/sbin/aptd") \
and "UPDATE_MANAGER_FORCE_BACKEND_SYNAPTIC" not in os.environ:
# check if the gtkwidgets are installed as well
try:
from .InstallBackendAptdaemon import InstallBackendAptdaemon
except ImportError:
import logging
logging.exception("importing aptdaemon")
# try synaptic
if os.path.exists("/usr/sbin/synaptic") \
and "UPDATE_MANAGER_FORCE_BACKEND_APTDAEMON" not in os.environ:
try:
from .InstallBackendSynaptic import InstallBackendSynaptic
except ImportError:
import logging
logging.exception("importing synaptic")
def get_backend(*args, **kwargs):
"""Select and return a package manager backend."""
# try aptdaemon
if (os.path.exists("/usr/sbin/aptd")
and "UPDATE_MANAGER_FORCE_BACKEND_SYNAPTIC" not in os.environ):
# check if the gtkwidgets are installed as well
try:
return InstallBackendAptdaemon(*args, **kwargs)
except NameError:
import logging
logging.exception("using aptdaemon failed")
# try synaptic
if (os.path.exists("/usr/sbin/synaptic")
and "UPDATE_MANAGER_FORCE_BACKEND_APTDAEMON" not in os.environ):
try:
return InstallBackendSynaptic(*args, **kwargs)
except NameError:
pass
# nothing found, raise
raise Exception("No working backend found, please try installing "
"aptdaemon or synaptic")
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