/usr/share/pyshared/x2go/xserver.py is in python-x2go 0.1.1.8-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (C) 2010-2011 by Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
#
# Python X2go 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 3 of the License, or
# (at your option) any later version.
#
# Python X2go 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.,
# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
#
# This code was initially written by:
# 2010 Dick Kniep <dick.kniep@lindix.nl>
#
# Other contributors:
# none so far
__NAME__ = 'x2goxserver-pylib'
from defaults import X2GOCLIENT_OS as _X2GOCLIENT_OS
if _X2GOCLIENT_OS == 'Windows':
import wmi
import win32process
# modules
import os
import threading
import gevent
import copy
# Python X2go modules
import log
from defaults import X2GO_XCONFIG_CONFIGFILES as _X2GO_XCONFIG_CONFIGFILES
from defaults import X2GO_CLIENTXCONFIG_DEFAULTS as _X2GO_CLIENTXCONFIG_DEFAULTS
import inifiles
class X2goClientXConfig(inifiles.X2goIniFile):
"""\
Configuration file based XServer startup settings for X2goClient instances.
This class is needed for Windows systems and (maybe soon) for Unix desktops using Wayland.
"""
defaultValues = _X2GO_CLIENTXCONFIG_DEFAULTS
def __init__(self, config_files=_X2GO_XCONFIG_CONFIGFILES, defaults=None, logger=None, loglevel=log.loglevel_DEFAULT):
"""\
Constructs an L{X2goClientXConfig} instance. This is normally done by an L{X2goClient} instance.
You can retrieve this L{X2goClientXConfig} instance with the C{X2goClient.get_client_xconfig()}
method.
On construction the L{X2goClientXConfig} instance is filled with values from the configuration files::
/etc/x2goclient/xconfig
~/.x2goclient/xconfig
The files are read in the specified order and config options of both files are merged. Options
set in the user configuration file (C{~/.x2goclient/xconfig}) override global options set in
C{/etc/x2goclient/xconfig}.
@param config_files: a list of configuration file names
@type config_files: C{list}
@param defaults: a Python dictionary with configuration file defaults (use on your own risk)
@type defaults: C{dict}
@param logger: you can pass an L{X2goLogger} object to the L{X2goClientXConfig} constructor
@type logger: C{instance}
@param loglevel: if no L{X2goLogger} object has been supplied a new one will be
constructed with the given loglevel
@type loglevel: C{int}
"""
if _X2GOCLIENT_OS not in ("Windows"):
import exceptions
class OSNotSupportedException(exceptions.StandardError): pass
raise OSNotSupportedException('classes of x2go.xserver module are for Windows only')
inifiles.X2goIniFile.__init__(self, config_files, defaults=defaults, logger=logger, loglevel=loglevel)
def get_xserver_config(self, xserver_name):
"""\
Retrieve the XServer configuration (from the xconfig file) for the given XServer application.
@param xserver_name: name of the XServer application
@type xserver_name: C{str}
@return: A Python dictionary containing the XServer's configuration settings
@rtype: C{list}
"""
_xserver_config = {}
for option in self.iniConfig.options(xserver_name):
_xserver_config[option] = self.get(xserver_name, option, key_type=self.get_type(xserver_name, option))
return _xserver_config
@property
def known_xservers(self):
"""\
Renders a list of XServers that are known to Python X2go.
"""
return self.get_value('XServers', 'known_xservers')
@property
def installed_xservers(self):
"""\
Among the known XServers renders a list of XServers that are actually
installed on the system.
"""
_installed = []
for xserver_name in self.known_xservers:
if os.path.exists(os.path.normpath(self.get_xserver_config(xserver_name)['test_installed'])):
_installed.append(xserver_name)
return _installed
@property
def running_xservers(self):
"""\
Tries to render a list of running XServer processes from the system's process list.
"""
_running = []
_wmi = wmi.WMI()
_p_names = []
for process in _wmi.Win32_Process():
_p_names.append(process.Name)
for xserver_name in self.installed_xservers:
process_name = self.get_xserver_config(xserver_name)['process_name']
if process_name in _p_names:
# XServer is already running
_running.append(xserver_name)
continue
return _running
@property
def xserver_launch_possible(self):
"""\
Detect if there is an XServer (that is known to Python X2go) installed on the system.
Equals C{True} if we have found an installed XServer that we can launch.
"""
return bool(self.installed_xservers)
@property
def xserver_launch_needed(self):
"""\
Detect if an XServer launch is really needed (or if we use an already running XServer instance).
Equals C{True} if we have to launch an XServer before we can start/resume
X2go sessions.
"""
return not bool(self.running_xservers)
@property
def preferred_xserver(self):
"""\
Renders a list of preferred XServer names (most preferred on top).
"""
if self.xserver_launch_possible and self.xserver_launch_needed:
return (self.installed_xservers[0], self.get_xserver_config(self.installed_xservers[0]))
else:
return None
class X2goXServer(threading.Thread):
"""
This class is responsible for starting/stopping an external XServer application.
X2go applications require a running XServer on the client system. This class will
manage/handle the XServer while your X2go application is running.
"""
def __init__(self, xserver_name, xserver_config, logger=None, loglevel=log.loglevel_DEFAULT):
"""\
Initialize an XServer thread.
@param xserver_name: name of the XServer to start (refer to the xconfig file for available names)
@type xserver_name: C{str}
@param xserver_config: XServer configuration node (as derived from L{X2goClientXConfig.get_xserver_config()}
@type xserver_config: C{dict}
@param logger: you can pass an L{X2goLogger} object to the L{X2goClientXConfig} constructor
@type logger: C{instance}
@param loglevel: if no L{X2goLogger} object has been supplied a new one will be
constructed with the given loglevel
@type loglevel: C{int}
"""
if _X2GOCLIENT_OS not in ("Windows"):
import exceptions
class OSNotSupportedException(exceptions.StandardError): pass
raise OSNotSupportedException('classes of x2go.xserver module are for Windows only')
if logger is None:
self.logger = log.X2goLogger(loglevel=loglevel)
else:
self.logger = copy.deepcopy(logger)
self.logger.tag = __NAME__
self._keepalive = None
self.xserver_name = xserver_name
self.xserver_config = xserver_config
if self.xserver_config.has_key('display'):
self.logger('settings DISPLAY environment variable to %s' % self.xserver_config['display'], loglevel=log.loglevel_NOTICE)
os.environ.update({'DISPLAY': str(self.xserver_config['display'])})
threading.Thread.__init__(self)
self.daemon = True
self.start()
def run(self):
"""\
Start this L{X2goXServer} thread. This will launch the configured XServer application.
"""
self._keepalive = True
cmd_line = [self.xserver_config['run_command']]
cmd_line.extend(self.xserver_config['parameters'])
self.logger('starting XServer ,,%s\'\' with command line: %s' % (self.xserver_name, ' '.join(cmd_line)), loglevel=log.loglevel_DEBUG)
if _X2GOCLIENT_OS == 'Windows':
si = win32process.STARTUPINFO()
p_info = win32process.CreateProcess(None,
' '.join(cmd_line),
None,
None,
0,
win32process.NORMAL_PRIORITY_CLASS,
None,
None,
si,
)
(hProcess, hThread, processId, threadId) = p_info
while self._keepalive:
gevent.sleep(1)
self.logger('terminating running XServer ,,%s\'\'' % self.xserver_name, loglevel=log.loglevel_DEBUG)
if _X2GOCLIENT_OS == 'Windows':
try:
win32process.TerminateProcess(hProcess, 0)
except win32process.error:
pass
def stop_thread(self):
"""\
A call to this method will stop the XServer application and do a cleanup afterwards.
"""
self.logger('stop_thread() method has been called', loglevel=log.loglevel_DEBUG)
self._keepalive = False
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