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# -*- coding: utf-8 -*-
# Authors: Natalia B. Bidart <nataliabidart@canonical.com>
#
# Copyright 2010 Canonical Ltd.
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 3, as published
# by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranties of
# MERCHANTABILITY, SATISFACTORY QUALITY, 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, see <http://www.gnu.org/licenses/>.
"""Client to manage packages."""
import apt
import aptdaemon.client
# pylint: disable=W0404
import aptdaemon.enums
try:
# Unable to import 'defer', pylint: disable=F0401,E0611,W0404
from aptdaemon.defer import inline_callbacks, return_value
except ImportError:
# Unable to import 'defer', pylint: disable=F0401,E0611,W0404
from defer import inline_callbacks, return_value
from aptdaemon.gtkwidgets import AptProgressBar
from ubuntuone.controlpanel.logger import setup_logging
logger = setup_logging('package_manager')
class PackageManagerProgressBar(AptProgressBar):
"""A progress bar for a transaction."""
class PackageManager(object):
"""Manage packages (check if is installed, install)."""
def is_installed(self, package_name):
"""Return whether 'package_name' is installed in this system."""
cache = apt.Cache()
result = package_name in cache and cache[package_name].is_installed
logger.debug('is %r installed? %r', package_name, result)
return result
@inline_callbacks
def install(self, package_name):
"""Install 'package_name' if is not installed in this system."""
if self.is_installed(package_name):
return_value(aptdaemon.enums.EXIT_SUCCESS)
client = aptdaemon.client.AptClient()
transaction = yield client.install_packages([package_name])
return_value(transaction)
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