2009-04-08  Vincent Untz  <vuntz@gnome.org>

	Make reboot and shutdown leave the session properly, by letting apps
	exit before doing the real reboot/shutdown.

	Note that because of the ConsoleKit policies, the ways it's handled
	when there are more than one user logged in or when the policy always
	require a password might be a bit different:
	 - in the usual case (single user, no password required), everything
	   works as expected.
	 - in the multiple users case (password generally required once), we
	   ask for the password before trying to exit the session.
	 - if the password is required each time the ConsoleKit action is
	   called, then we'll ask for the password only once, after having made
	   all apps exit. If this doesn't work (wrong password), since the
	   session is killed anyway, we log out and ask gdm to do the action.

	* gnome-session/gsm-marshal.list: add new signature that we need
	* gnome-session/gsm-consolekit.[ch]: add new privileges-completed
	signal
	(gsm_consolekit_class_init): add new signal
	(gsm_consolekit_get_result_for_action): new, split from
	gsm_consolekit_can_do_action()
	(gsm_consolekit_can_do_action): ensure that the CK connection works
	here (instead of requiring callers to do it), and use
	gsm_consolekit_get_result_for_action()
	(gsm_consolekit_is_session_for_other_user): new, ask ConsoleKit if a
	session object is for a different user than the current user (ignoring
	the login sessions)
	(gsm_consolekit_is_single_user): new, determine if there's only a
	single user logged in on this machine
	(obtain_privileges_cb): new, PolicyKit callback when the privileges
	were obtained/denied, to send the privileges-completed signal
	(gsm_consolekit_obtain_privileges_for_action): new, obtain the
	PolicyKit privileges for a specific action
	(gsm_consolekit_get_privileges_for_actions): new, to know if we have
	privileges for a set of actions, and request the privileges if needed
	(gsm_consolekit_get_restart_privileges): new, trivial
	(gsm_consolekit_get_stop_privileges): new, trivial
	(gsm_consolekit_can_restart): do not ensure that the CK connection
	works here, it will be done in gsm_consolekit_can_do_action()
	(gsm_consolekit_can_stop): ditto

	* gnome-session/gsm-manager.c: we add a logout type variable that lets
	us remember what should be done when gnome-session exits.
	(quit_request_completed): new, callback that will make gnome-session
	exit after the ConsoleKit call to Stop/Restart has been done. If the
	ConsoleKit call wasn't successful, we fallback on gdm (since we're in
	the EXIT phase, and all apps have quitted, there's no point in not
	asking gdm to do that).
	(gsm_manager_quit): new, to do the right thing to log out depending on
	what the user wanted to achieve when logging out.
	(end_phase): use gsm_manager_quit() instead of directly calling
	gtk_main_quit()
	(cancel_end_session): reset the logout type to none
	(do_attempt_reboot), (do_attempt_shutdown), (manager_attempt_reboot),
	(manager_attempt_shutdown): killed/merged in
	request_reboot/request_shutdown
	(do_inhibit_dialog_action): renamed from do_dialog_action(); for
	shutdown and reboot, we just do like logout and end the phase.
	(inhibit_dialog_response): s/do_dialog_action/do_inhibit_dialog_action
	(query_end_session_complete): add a comment about
	gsm_inhibit_dialog_new to make it clear that the
	GSM_LOGOUT_ACTION_LOGOUT parameter is fine for shutdown and reboot too
	(request_reboot_privileges_completed): new, handle the fact that we got
	the privileges from ConsoleKit to do the reboot.
	(request_reboot): ask ConsoleKit for the privileges to reboot, and if
	it doesn't work (no ConsoleKit), just end the phase
	(request_shutdown_privileges_completed), (request_shutdown): see above
	changes for reboot functions
	(request_logout): set the logout type

svn path=/trunk/; revision=5377