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345 lines
12 KiB
Python
345 lines
12 KiB
Python
# Copyright (C) 2006-2007 Red Hat, Inc.
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# Copyright (C) 2010 Collabora Ltd. <http://www.collabora.co.uk/>
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library 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 GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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"""Shell side object which manages request to start activity
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UNSTABLE. Activities are currently not allowed to run other activities so at
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the moment there is no reason to stabilize this API.
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"""
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import logging
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import dbus
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from gi.repository import GObject
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from gi.repository import GLib
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from sugar3.activity.activityhandle import ActivityHandle
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from sugar3 import util
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from sugar3 import env
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from sugar3.datastore import datastore
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from errno import EEXIST, ENOSPC
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import os
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import subprocess
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_SHELL_SERVICE = 'org.laptop.Shell'
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_SHELL_PATH = '/org/laptop/Shell'
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_SHELL_IFACE = 'org.laptop.Shell'
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_ACTIVITY_FACTORY_INTERFACE = 'org.laptop.ActivityFactory'
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# helper method to close all filedescriptors
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# borrowed from subprocess.py
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try:
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MAXFD = os.sysconf('SC_OPEN_MAX')
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except ValueError:
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MAXFD = 256
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def _close_fds():
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for i in range(3, MAXFD):
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try:
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os.close(i)
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# pylint: disable=W0704
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except Exception:
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pass
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def create_activity_id():
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"""Generate a new, unique ID for this activity"""
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return util.unique_id()
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def _mkdir(path):
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try:
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os.mkdir(path)
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except OSError as e:
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if e.errno != EEXIST:
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raise e
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def get_environment(activity):
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environ = os.environ.copy()
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bin_path = os.path.join(activity.get_path(), 'bin')
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activity_root = env.get_profile_path(activity.get_bundle_id())
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_mkdir(activity_root)
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instance_dir = os.path.join(activity_root, 'instance')
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_mkdir(instance_dir)
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data_dir = os.path.join(activity_root, 'data')
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_mkdir(data_dir)
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tmp_dir = os.path.join(activity_root, 'tmp')
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_mkdir(tmp_dir)
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environ['SUGAR_BUNDLE_PATH'] = activity.get_path()
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environ['SUGAR_BUNDLE_ID'] = activity.get_bundle_id()
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environ['SUGAR_ACTIVITY_ROOT'] = activity_root
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environ['PATH'] = bin_path + ':' + environ['PATH']
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if activity.get_path().startswith(env.get_user_activities_path()):
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environ['SUGAR_LOCALEDIR'] = os.path.join(activity.get_path(),
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'locale')
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return environ
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def get_command(activity, activity_id=None, object_id=None, uri=None,
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activity_invite=False):
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if not activity_id:
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activity_id = create_activity_id()
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command = activity.get_command().split(' ')
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command.extend(['-b', activity.get_bundle_id()])
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command.extend(['-a', activity_id])
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if object_id is not None:
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command.extend(['-o', object_id])
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if uri is not None:
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command.extend(['-u', uri])
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if activity_invite:
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command.append('-i')
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# if the command is in $BUNDLE_ROOT/bin, execute the absolute path so there
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# is no need to mangle with the shell's PATH
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if '/' not in command[0]:
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bin_path = os.path.join(activity.get_path(), 'bin')
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absolute_path = os.path.join(bin_path, command[0])
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if os.path.exists(absolute_path):
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command[0] = absolute_path
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logging.debug('launching: %r' % command)
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return command
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def open_log_file(activity):
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i = 1
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while True:
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path = env.get_logs_path('%s-%s.log' % (activity.get_bundle_id(), i))
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try:
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fd = os.open(path, os.O_EXCL | os.O_CREAT | os.O_WRONLY, 0o644)
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f = os.fdopen(fd, 'w')
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return (path, f)
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except OSError as e:
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if e.errno == EEXIST:
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i += 1
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elif e.errno == ENOSPC:
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# not the end of the world; let's try to keep going.
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return ('/dev/null', open('/dev/null', 'w'))
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else:
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raise e
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class ActivityCreationHandler(GObject.GObject):
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"""Sugar-side activity creation interface
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This object uses a dbus method on the ActivityFactory
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service to create the new activity. It generates
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GObject events in response to the success/failure of
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activity startup using callbacks to the service's
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create call.
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"""
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def __init__(self, bundle, handle):
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"""Initialise the handler
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bundle -- the ActivityBundle to launch
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activity_handle -- stores the values which are to
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be passed to the service to uniquely identify
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the activity to be created and the sharing
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service that may or may not be connected with it
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sugar3.activity.activityhandle.ActivityHandle instance
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calls the "create" method on the service for this
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particular activity type and registers the
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_reply_handler and _error_handler methods on that
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call's results.
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The specific service which creates new instances of this
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particular type of activity is created during the activity
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registration process in shell bundle registry which creates
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service definition files for each registered bundle type.
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If the file '/etc/olpc-security' exists, then activity launching
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will be delegated to the prototype 'Rainbow' security service.
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"""
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GObject.GObject.__init__(self)
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self._bundle = bundle
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self._service_name = bundle.get_bundle_id()
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self._handle = handle
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bus = dbus.SessionBus()
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bus_object = bus.get_object(_SHELL_SERVICE, _SHELL_PATH)
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self._shell = dbus.Interface(bus_object, _SHELL_IFACE)
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if handle.activity_id is not None and handle.object_id is None:
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datastore.find({'activity_id': self._handle.activity_id},
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reply_handler=self._find_object_reply_handler,
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error_handler=self._find_object_error_handler)
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else:
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self._launch_activity()
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def _launch_activity(self):
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if self._handle.activity_id is not None:
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self._shell.ActivateActivity(
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self._handle.activity_id,
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reply_handler=self._activate_reply_handler,
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error_handler=self._activate_error_handler)
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else:
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self._create_activity()
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def _create_activity(self):
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if self._handle.activity_id is None:
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self._handle.activity_id = create_activity_id()
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self._shell.NotifyLaunch(
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self._service_name, self._handle.activity_id,
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reply_handler=self._no_reply_handler,
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error_handler=self._notify_launch_error_handler)
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environ = get_environment(self._bundle)
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(log_path, log_file) = open_log_file(self._bundle)
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command = get_command(self._bundle, self._handle.activity_id,
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self._handle.object_id, self._handle.uri,
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self._handle.invited)
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dev_null = open('/dev/null', 'r')
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child = subprocess.Popen([str(s) for s in command],
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env=environ,
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cwd=str(self._bundle.get_path()),
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close_fds=True,
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stdin=dev_null.fileno(),
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stdout=log_file.fileno(),
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stderr=log_file.fileno())
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GLib.child_watch_add(child.pid,
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_child_watch_cb,
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(log_file, self._handle.activity_id))
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def _no_reply_handler(self, *args):
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pass
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def _notify_launch_failure_error_handler(self, err):
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logging.error('Notify launch failure failed %s' % err)
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def _notify_launch_error_handler(self, err):
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logging.debug('Notify launch failed %s' % err)
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def _activate_reply_handler(self, activated):
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if not activated:
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self._create_activity()
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def _activate_error_handler(self, err):
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logging.error('Activity activation request failed %s' % err)
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def _create_reply_handler(self):
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logging.debug('Activity created %s (%s).' %
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(self._handle.activity_id, self._service_name))
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def _create_error_handler(self, err):
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logging.error("Couldn't create activity %s (%s): %s" %
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(self._handle.activity_id, self._service_name, err))
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self._shell.NotifyLaunchFailure(
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self._handle.activity_id, reply_handler=self._no_reply_handler,
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error_handler=self._notify_launch_failure_error_handler)
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def _find_object_reply_handler(self, jobjects, count):
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if count > 0:
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if count > 1:
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logging.debug('Multiple objects has the same activity_id.')
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self._handle.object_id = jobjects[0]['uid']
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self._launch_activity()
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def _find_object_error_handler(self, err):
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logging.error('Datastore find failed %s' % err)
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self._launch_activity()
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def create(bundle, activity_handle=None):
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"""Create a new activity from its name."""
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if not activity_handle:
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activity_handle = ActivityHandle()
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return ActivityCreationHandler(bundle, activity_handle)
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def create_with_uri(bundle, uri):
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"""Create a new activity and pass the uri as handle."""
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activity_handle = ActivityHandle(uri=uri)
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return ActivityCreationHandler(bundle, activity_handle)
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def create_with_object_id(bundle, object_id):
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"""Create a new activity and pass the object id as handle."""
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activity_handle = ActivityHandle(object_id=object_id)
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return ActivityCreationHandler(bundle, activity_handle)
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def _child_watch_cb(pid, condition, user_data):
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log_file, activity_id = user_data
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if os.WIFEXITED(condition):
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status = os.WEXITSTATUS(condition)
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signum = None
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message = 'Exited with status %s' % status
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elif os.WIFSIGNALED(condition):
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status = None
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signum = os.WTERMSIG(condition)
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message = 'Terminated by signal %s' % signum
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else:
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status = None
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signum = os.WTERMSIG(condition)
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message = 'Undefined status with signal %s' % signum
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try:
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log_file.write('%s, pid %s data %s\n' % (message, pid, user_data))
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finally:
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log_file.close()
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# try to reap zombies in case SIGCHLD has not been set to SIG_IGN
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try:
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os.waitpid(pid, 0)
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except OSError:
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# SIGCHLD = SIG_IGN, no zombies
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pass
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if status or signum:
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# XXX have to recreate dbus object since we can't reuse
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# ActivityCreationHandler's one, see
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# https://bugs.freedesktop.org/show_bug.cgi?id=23507
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bus = dbus.SessionBus()
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bus_object = bus.get_object(_SHELL_SERVICE, _SHELL_PATH)
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shell = dbus.Interface(bus_object, _SHELL_IFACE)
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def reply_handler_cb(*args):
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pass
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def error_handler_cb(error):
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logging.error('Cannot send NotifyLaunchFailure to the shell')
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# TODO send launching failure but activity could already show
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# main window, see http://bugs.sugarlabs.org/ticket/1447#comment:19
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shell.NotifyLaunchFailure(activity_id,
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reply_handler=reply_handler_cb,
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error_handler=error_handler_cb)
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