194 lines
6.2 KiB
Python
194 lines
6.2 KiB
Python
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#
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# Functions to launch and test DBus session.
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#
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# Functions here are NOT RECOMMENDED to be called in modules. These functions
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# could have unexpected behavior when called in modules and not in main
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# anaconda application.
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#
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# Copyright (C) 2018
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# Red Hat, Inc. All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Author(s): Jiri Konecny <jkonecny@redhat.com>
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#
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import os
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import signal
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from subprocess import TimeoutExpired
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from pyanaconda.core.configuration.anaconda import conf
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from pyanaconda.core.util import startProgram
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from pyanaconda.core.constants import ANACONDA_BUS_ADDR_FILE, ANACONDA_CONFIG_TMP, \
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ANACONDA_BUS_CONF_FILE, DBUS_ANACONDA_SESSION_ADDRESS
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from pyanaconda.core.dbus import DBus
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from pyanaconda.core.path import open_with_perm
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from dasbus.constants import DBUS_FLAG_NONE
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from pyanaconda.modules.common.constants.services import BOSS
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from pyanaconda.anaconda_loggers import get_anaconda_root_logger
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from pyanaconda.modules.common.task import sync_run_task
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log = get_anaconda_root_logger()
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__all__ = ["AnacondaDBusLauncher"]
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class AnacondaDBusLauncher(object):
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"""Class for launching the Anaconda DBus modules."""
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DBUS_LAUNCH_BIN = "dbus-daemon"
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def __init__(self):
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self._dbus_daemon_process = None
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self._log_file = None
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self._bus_address = None
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@property
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def bus_address(self):
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"""The address of the Anaconda DBus session."""
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return self._bus_address
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def start(self):
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"""Start DBus modules.
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Start the DBus session, the boss and the kickstart modules.
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"""
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self._write_temporary_config()
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self._start_dbus_session()
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self._set_environment()
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self._write_bus_address()
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self._start_boss()
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self._start_modules()
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def stop(self, timeout=20):
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"""Stop the DBus modules.
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Stop the DBus session, the boss and the kickstart modules.
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:param timeout: seconds to the launcher timeout
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"""
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self._stop_boss_and_modules()
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self._stop_dbus_session(timeout)
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self._remove_bus_address_file()
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self._remove_temporary_config()
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def _write_temporary_config(self):
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"""Create the temporary config file."""
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dirname = os.path.dirname(ANACONDA_CONFIG_TMP)
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if not os.path.exists(dirname):
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os.makedirs(dirname)
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log.info("Configuration loaded from: %s", conf.get_sources())
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log.info("Writing the runtime configuration to: %s", ANACONDA_CONFIG_TMP)
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conf.write(ANACONDA_CONFIG_TMP)
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def _remove_temporary_config(self):
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"""Remove the temporary config file."""
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if os.path.exists(ANACONDA_CONFIG_TMP):
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os.unlink(ANACONDA_CONFIG_TMP)
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def _start_dbus_session(self):
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"""Start dbus session if not running already."""
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command = [
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self.DBUS_LAUNCH_BIN,
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'--print-address',
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"--syslog",
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"--config-file={}".format(ANACONDA_BUS_CONF_FILE)
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]
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def dbus_preexec():
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# to set dbus subprocess SIGINT handler
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signal.signal(signal.SIGINT, signal.SIG_IGN)
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self._log_file = open_with_perm('/tmp/dbus.log', 'a', 0o600)
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self._dbus_daemon_process = startProgram(command, stderr=self._log_file, reset_lang=False,
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preexec_fn=dbus_preexec)
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if self._dbus_daemon_process.poll() is not None:
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raise RuntimeError("DBus wasn't properly started!")
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address = self._dbus_daemon_process.stdout.readline().decode('utf-8').strip()
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if not address:
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raise RuntimeError("Unable to start DBus session!")
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self._bus_address = address
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def _stop_dbus_session(self, timeout):
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"""Stop DBus service and clean bus address file."""
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if self._log_file:
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self._log_file.close()
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if not self._dbus_daemon_process:
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return
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self._dbus_daemon_process.terminate()
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try:
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self._dbus_daemon_process.wait(timeout)
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except TimeoutExpired:
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log.error("DBus daemon wasn't terminated kill it now")
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self._dbus_daemon_process.kill()
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ret_code = self._dbus_daemon_process.poll()
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if ret_code is None:
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log.error("DBus daemon can't be killed!")
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elif ret_code != 0:
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log.error("DBus daemon exited with error %s", ret_code)
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def _set_environment(self):
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"""Set the environment variables."""
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# pylint: disable=environment-modify
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os.environ[DBUS_ANACONDA_SESSION_ADDRESS] = self._bus_address
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def _write_bus_address(self):
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"""Write the bus address to a file."""
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file_name = ANACONDA_BUS_ADDR_FILE
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run_dir = os.path.dirname(file_name)
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if not os.path.exists(run_dir):
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os.mkdir(run_dir)
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with open(file_name, 'wt') as f:
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f.write(self._bus_address)
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def _remove_bus_address_file(self):
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"""Remove the file with the bus address."""
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f = ANACONDA_BUS_ADDR_FILE
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if os.path.exists(f):
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os.unlink(f)
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def _start_boss(self):
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"""Start the boss."""
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bus_proxy = DBus.proxy
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bus_proxy.StartServiceByName(BOSS.service_name, DBUS_FLAG_NONE)
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def _start_modules(self):
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"""Start the kickstart modules."""
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boss_proxy = BOSS.get_proxy()
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task_path = boss_proxy.StartModulesWithTask()
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task_proxy = BOSS.get_proxy(task_path)
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sync_run_task(task_proxy)
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def _stop_boss_and_modules(self):
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"""Stop the boss and the kickstart modules."""
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boss_proxy = BOSS.get_proxy()
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boss_proxy.Quit()
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