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/* GIO testing utilities
*
* Copyright (C) 2008-2010 Red Hat, Inc.
* Copyright (C) 2012 Collabora Ltd. <http://www.collabora.co.uk/>
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Authors: David Zeuthen <davidz@redhat.com>
* Xavier Claessens <xavier.claessens@collabora.co.uk>
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <gstdio.h>
#ifdef G_OS_UNIX
#include <unistd.h>
#endif
#ifdef G_OS_WIN32
#include <io.h>
#include <fcntl.h>
#include <windows.h>
#endif
#include <glib.h>
#include "gdbusconnection.h"
#include "gdbusprivate.h"
#include "gfile.h"
#include "gioenumtypes.h"
#include "gtestdbus.h"
#include "glibintl.h"
#ifdef G_OS_UNIX
#include "glib-unix.h"
#include "glib-unixprivate.h"
#endif
/* -------------------------------------------------------------------------- */
/* Utility: Wait until object has a single ref */
typedef struct
{
GMainLoop *loop;
gboolean timed_out;
} WeakNotifyData;
static void
on_weak_notify_timeout (gpointer user_data)
{
WeakNotifyData *data = user_data;
data->timed_out = TRUE;
g_main_loop_quit (data->loop);
}
static gboolean
unref_on_idle (gpointer object)
{
g_object_unref (object);
return FALSE;
}
static gboolean
_g_object_unref_and_wait_weak_notify (gpointer object)
{
WeakNotifyData data;
guint timeout_id;
data.loop = g_main_loop_new (NULL, FALSE);
data.timed_out = FALSE;
g_object_weak_ref (object, (GWeakNotify) g_main_loop_quit, data.loop);
/* Drop the strong ref held by the caller in an idle callback. This is to
* make sure the mainloop is already running when weak notify happens (when
* all other strong ref holders have dropped theirs). */
g_idle_add (unref_on_idle, object);
/* Make sure we don't block forever */
timeout_id = g_timeout_add_seconds_once (30, on_weak_notify_timeout, &data);
g_main_loop_run (data.loop);
if (data.timed_out)
{
g_warning ("Weak notify timeout, object ref_count=%d",
G_OBJECT (object)->ref_count);
}
else
{
g_source_remove (timeout_id);
}
g_main_loop_unref (data.loop);
return data.timed_out;
}
/* -------------------------------------------------------------------------- */
/* Utilities to cleanup the mess in the case unit test process crash */
#ifdef G_OS_WIN32
/* This could be interesting to expose in public API */
static void
_g_test_watcher_add_pid (GPid pid)
{
HANDLE job = NULL;
if (g_once_init_enter (&job))
{
JOBOBJECT_EXTENDED_LIMIT_INFORMATION info;
HANDLE tmp = CreateJobObjectW (NULL, NULL);
memset (&info, 0, sizeof (info));
info.BasicLimitInformation.LimitFlags = 0x2000 /* JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE */;
if (!SetInformationJobObject (tmp, JobObjectExtendedLimitInformation, &info, sizeof (info)))
g_warning ("Can't enable JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE: %s", g_win32_error_message (GetLastError()));
g_once_init_leave_pointer (&job, tmp);
}
if (!AssignProcessToJobObject(job, pid))
g_warning ("Can't assign process to job: %s", g_win32_error_message (GetLastError()));
}
static void
_g_test_watcher_remove_pid (GPid pid)
{
/* No need to unassign the process from the job object as the process
will be killed anyway */
}
#else
#define ADD_PID_FORMAT "add pid %d\n"
#define REMOVE_PID_FORMAT "remove pid %d\n"
static void
watch_parent (gint fd)
{
GIOChannel *channel;
GPollFD fds[1];
GArray *pids_to_kill;
channel = g_io_channel_unix_new (fd);
fds[0].fd = fd;
fds[0].events = G_IO_HUP | G_IO_IN;
fds[0].revents = 0;
pids_to_kill = g_array_new (FALSE, FALSE, sizeof (guint));
do
{
gint num_events;
gchar *command = NULL;
guint pid;
guint n;
GError *error = NULL;
num_events = g_poll (fds, 1, -1);
if (num_events == 0)
continue;
if (fds[0].revents & G_IO_HUP)
{
/* Parent quit, cleanup the mess and exit */
for (n = 0; n < pids_to_kill->len; n++)
{
pid = g_array_index (pids_to_kill, guint, n);
g_printerr ("cleaning up pid %d\n", pid);
kill (pid, SIGTERM);
}
g_array_unref (pids_to_kill);
g_io_channel_shutdown (channel, FALSE, &error);
g_assert_no_error (error);
g_io_channel_unref (channel);
exit (0);
}
/* Read the command from the input */
g_io_channel_read_line (channel, &command, NULL, NULL, &error);
g_assert_no_error (error);
/* Check for known commands */
if (sscanf (command, ADD_PID_FORMAT, &pid) == 1)
{
g_array_append_val (pids_to_kill, pid);
}
else if (sscanf (command, REMOVE_PID_FORMAT, &pid) == 1)
{
for (n = 0; n < pids_to_kill->len; n++)
{
if (g_array_index (pids_to_kill, guint, n) == pid)
{
g_array_remove_index (pids_to_kill, n);
pid = 0;
break;
}
}
if (pid != 0)
{
g_warning ("unknown pid %d to remove", pid);
}
}
else
{
g_warning ("unknown command from parent '%s'", command);
}
g_free (command);
}
while (TRUE);
}
static GIOChannel *
watcher_init (void)
{
static gsize started = 0;
static GIOChannel *channel = NULL;
int errsv;
if (g_once_init_enter (&started))
{
gint pipe_fds[2];
/* fork a child to clean up when we are killed */
if (!g_unix_open_pipe_internal (pipe_fds, TRUE, FALSE))
{
errsv = errno;
g_warning ("pipe() failed: %s", g_strerror (errsv));
g_assert_not_reached ();
}
/* flush streams to avoid buffers being duplicated in the child and
* flushed by both the child and parent later
*
* FIXME: This is a workaround for the fact that watch_parent() uses
* non-async-signal-safe API. See
* https://gitlab.gnome.org/GNOME/glib/-/issues/2322#note_1034330
*/
fflush (stdout);
fflush (stderr);
switch (fork ())
{
case -1:
errsv = errno;
g_warning ("fork() failed: %s", g_strerror (errsv));
g_assert_not_reached ();
break;
case 0:
/* child */
close (pipe_fds[1]);
watch_parent (pipe_fds[0]);
break;
default:
/* parent */
close (pipe_fds[0]);
channel = g_io_channel_unix_new (pipe_fds[1]);
}
g_once_init_leave (&started, 1);
}
return channel;
}
static void
watcher_send_command (const gchar *command)
{
GIOChannel *channel;
GError *error = NULL;
GIOStatus status;
channel = watcher_init ();
do
status = g_io_channel_write_chars (channel, command, -1, NULL, &error);
while (status == G_IO_STATUS_AGAIN);
g_assert_no_error (error);
g_io_channel_flush (channel, &error);
g_assert_no_error (error);
}
/* This could be interesting to expose in public API */
static void
_g_test_watcher_add_pid (GPid pid)
{
gchar *command;
command = g_strdup_printf (ADD_PID_FORMAT, (guint) pid);
watcher_send_command (command);
g_free (command);
}
static void
_g_test_watcher_remove_pid (GPid pid)
{
gchar *command;
command = g_strdup_printf (REMOVE_PID_FORMAT, (guint) pid);
watcher_send_command (command);
g_free (command);
}
#endif
/* -------------------------------------------------------------------------- */
/* GTestDBus object implementation */
/**
* GTestDBus:
*
* A helper class for testing code which uses D-Bus without touching the user’s
* session bus.
*
* Note that `GTestDBus` modifies the user’s environment, calling
* [`setenv()`](man:setenv(3)). This is not thread-safe, so all `GTestDBus`
* calls should be completed before threads are spawned, or should have
* appropriate locking to ensure no access conflicts to environment variables
* shared between `GTestDBus` and other threads.
*
* ## Creating unit tests using `GTestDBus`
*
* Testing of D-Bus services can be tricky because normally we only ever run
* D-Bus services over an existing instance of the D-Bus daemon thus we
* usually don’t activate D-Bus services that are not yet installed into the
* target system. The `GTestDBus` object makes this easier for us by taking care
* of the lower level tasks such as running a private D-Bus daemon and looking
* up uninstalled services in customizable locations, typically in your source
* code tree.
*
* The first thing you will need is a separate service description file for the
* D-Bus daemon. Typically a `services` subdirectory of your `tests` directory
* is a good place to put this file.
*
* The service file should list your service along with an absolute path to the
* uninstalled service executable in your source tree. Using autotools we would
* achieve this by adding a file such as `my-server.service.in` in the services
* directory and have it processed by configure.
*
* ```
* [D-BUS Service]
* Name=org.gtk.GDBus.Examples.ObjectManager
* Exec=@abs_top_builddir@/gio/tests/gdbus-example-objectmanager-server
* ```
*
* You will also need to indicate this service directory in your test
* fixtures, so you will need to pass the path while compiling your
* test cases. Typically this is done with autotools with an added
* preprocessor flag specified to compile your tests such as:
*
* ```
* -DTEST_SERVICES=\""$(abs_top_builddir)/tests/services"\"
* ```
*
* Once you have a service definition file which is local to your source tree,
* you can proceed to set up a GTest fixture using the `GTestDBus` scaffolding.
*
* An example of a test fixture for D-Bus services can be found
* here:
* [gdbus-test-fixture.c](https://gitlab.gnome.org/GNOME/glib/-/blob/HEAD/gio/tests/gdbus-test-fixture.c)
*
* Note that these examples only deal with isolating the D-Bus aspect of your
* service. To successfully run isolated unit tests on your service you may need
* some additional modifications to your test case fixture. For example; if your
* service uses [class@Gio.Settings] and installs a schema then it is important
* that your test service not load the schema in the ordinary installed location
* (chances are that your service and schema files are not yet installed, or
* worse; there is an older version of the schema file sitting in the install
* location).
*
* Most of the time we can work around these obstacles using the
* environment. Since the environment is inherited by the D-Bus daemon
* created by `GTestDBus` and then in turn inherited by any services the
* D-Bus daemon activates, using the setup routine for your fixture is
* a practical place to help sandbox your runtime environment. For the
* rather typical GSettings case we can work around this by setting
* `GSETTINGS_SCHEMA_DIR` to the in tree directory holding your schemas
* in the above `fixture_setup()` routine.
*
* The GSettings schemas need to be locally pre-compiled for this to work. This
* can be achieved by compiling the schemas locally as a step before running
* test cases, an autotools setup might do the following in the directory
* holding schemas:
*
* ```
* all-am:
* $(GLIB_COMPILE_SCHEMAS) .
*
* CLEANFILES += gschemas.compiled
* ```
*
* Since: 2.34
*/
typedef struct _GTestDBusClass GTestDBusClass;
typedef struct _GTestDBusPrivate GTestDBusPrivate;
struct _GTestDBus {
GObject parent;
GTestDBusPrivate *priv;
};
struct _GTestDBusClass {
GObjectClass parent_class;
};
struct _GTestDBusPrivate
{
GTestDBusFlags flags;
GPtrArray *service_dirs;
GPid bus_pid;
gchar *bus_address;
gboolean up;
};
enum
{
PROP_0,
PROP_FLAGS,
};
G_DEFINE_TYPE_WITH_PRIVATE (GTestDBus, g_test_dbus, G_TYPE_OBJECT)
static void
g_test_dbus_init (GTestDBus *self)
{
self->priv = g_test_dbus_get_instance_private (self);
self->priv->service_dirs = g_ptr_array_new_with_free_func (g_free);
}
static void
g_test_dbus_dispose (GObject *object)
{
GTestDBus *self = (GTestDBus *) object;
if (self->priv->up)
g_test_dbus_down (self);
G_OBJECT_CLASS (g_test_dbus_parent_class)->dispose (object);
}
static void
g_test_dbus_finalize (GObject *object)
{
GTestDBus *self = (GTestDBus *) object;
g_ptr_array_unref (self->priv->service_dirs);
g_free (self->priv->bus_address);
G_OBJECT_CLASS (g_test_dbus_parent_class)->finalize (object);
}
static void
g_test_dbus_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GTestDBus *self = (GTestDBus *) object;
switch (property_id)
{
case PROP_FLAGS:
g_value_set_flags (value, g_test_dbus_get_flags (self));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
g_test_dbus_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GTestDBus *self = (GTestDBus *) object;
switch (property_id)
{
case PROP_FLAGS:
self->priv->flags = g_value_get_flags (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
g_test_dbus_class_init (GTestDBusClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->dispose = g_test_dbus_dispose;
object_class->finalize = g_test_dbus_finalize;
object_class->get_property = g_test_dbus_get_property;
object_class->set_property = g_test_dbus_set_property;
/**
* GTestDBus:flags:
*
* #GTestDBusFlags specifying the behaviour of the D-Bus session.
*
* Since: 2.34
*/
g_object_class_install_property (object_class, PROP_FLAGS,
g_param_spec_flags ("flags", NULL, NULL,
G_TYPE_TEST_DBUS_FLAGS, G_TEST_DBUS_NONE,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
}
static gchar *
write_config_file (GTestDBus *self)
{
GString *contents;
gint fd;
guint i;
GError *error = NULL;
gchar *path = NULL;
fd = g_file_open_tmp ("g-test-dbus-XXXXXX", &path, &error);
g_assert_no_error (error);
contents = g_string_new (NULL);
g_string_append (contents,
"<busconfig>\n"
" <type>session</type>\n"
#ifdef G_OS_WIN32
" <listen>nonce-tcp:</listen>\n"
#else
" <listen>unix:tmpdir=/tmp</listen>\n"
#endif
);
for (i = 0; i < self->priv->service_dirs->len; i++)
{
const gchar *dir_path = g_ptr_array_index (self->priv->service_dirs, i);
g_string_append_printf (contents,
" <servicedir>%s</servicedir>\n", dir_path);
}
g_string_append (contents,
" <policy context=\"default\">\n"
" <!-- Allow everything to be sent -->\n"
" <allow send_destination=\"*\" eavesdrop=\"true\"/>\n"
" <!-- Allow everything to be received -->\n"
" <allow eavesdrop=\"true\"/>\n"
" <!-- Allow anyone to own anything -->\n"
" <allow own=\"*\"/>\n"
" </policy>\n"
"</busconfig>\n");
close (fd);
g_file_set_contents_full (path, contents->str, contents->len,
G_FILE_SET_CONTENTS_NONE,
0600, &error);
g_assert_no_error (error);
g_string_free (contents, TRUE);
return path;
}
static gboolean
make_pipe (gint pipe_fds[2],
GError **error)
{
#if defined(G_OS_UNIX)
return g_unix_open_pipe (pipe_fds, O_CLOEXEC, error);
#elif defined(G_OS_WIN32)
if (_pipe (pipe_fds, 4096, _O_BINARY) < 0)
{
int errsv = errno;
g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_FAILED,
_("Failed to create pipe for communicating with child process (%s)"),
g_strerror (errsv));
return FALSE;
}
return TRUE;
#else
g_set_error (error, G_SPAWN_ERROR, G_SPAWN_ERROR_FAILED,
_("Pipes are not supported in this platform"));
return FALSE;
#endif
}
static void
start_daemon (GTestDBus *self)
{
const gchar *argv[] = {"dbus-daemon", "--print-address", "--config-file=foo", NULL};
gint pipe_fds[2] = {-1, -1};
gchar *config_path;
gchar *config_arg;
gchar *print_address;
GIOChannel *channel;
gsize termpos;
GError *error = NULL;
if (g_getenv ("G_TEST_DBUS_DAEMON") != NULL)
argv[0] = (gchar *)g_getenv ("G_TEST_DBUS_DAEMON");
make_pipe (pipe_fds, &error);
g_assert_no_error (error);
print_address = g_strdup_printf ("--print-address=%d", pipe_fds[1]);
argv[1] = print_address;
g_assert_no_error (error);
/* Write config file and set its path in argv */
config_path = write_config_file (self);
config_arg = g_strdup_printf ("--config-file=%s", config_path);
argv[2] = config_arg;
/* Spawn dbus-daemon */
g_spawn_async_with_pipes_and_fds (NULL,
argv,
NULL,
/* We Need this to get the pid returned on win32 */
G_SPAWN_DO_NOT_REAP_CHILD |
G_SPAWN_SEARCH_PATH |
/* dbus-daemon will not abuse our descriptors, and
* passing this means we can use posix_spawn() for speed */
G_SPAWN_LEAVE_DESCRIPTORS_OPEN,
NULL, NULL,
-1, -1, -1,
&pipe_fds[1], &pipe_fds[1], 1,
&self->priv->bus_pid,
NULL, NULL, NULL,
&error);
g_assert_no_error (error);
_g_test_watcher_add_pid (self->priv->bus_pid);
/* Read bus address from pipe */
channel = g_io_channel_unix_new (pipe_fds[0]);
pipe_fds[0] = -1;
g_io_channel_set_close_on_unref (channel, TRUE);
g_io_channel_read_line (channel, &self->priv->bus_address, NULL,
&termpos, &error);
g_assert_no_error (error);
self->priv->bus_address[termpos] = '\0';
close (pipe_fds[1]);
pipe_fds[1] = -1;
/* start dbus-monitor */
if (g_getenv ("G_DBUS_MONITOR") != NULL)
{
gchar *command;
command = g_strdup_printf ("dbus-monitor --address %s",
self->priv->bus_address);
g_spawn_command_line_async (command, NULL);
g_free (command);
g_usleep (500 * 1000);
}
/* Cleanup */
g_io_channel_shutdown (channel, FALSE, &error);
g_assert_no_error (error);
g_io_channel_unref (channel);
/* Don't use g_file_delete since it calls into gvfs */
if (g_unlink (config_path) != 0)
g_assert_not_reached ();
g_free (print_address);
g_free (config_path);
g_free (config_arg);
}
static void
stop_daemon (GTestDBus *self)
{
#ifdef G_OS_WIN32
if (!TerminateProcess (self->priv->bus_pid, 0))
g_warning ("Can't terminate process: %s", g_win32_error_message (GetLastError()));
#else
kill (self->priv->bus_pid, SIGTERM);
#endif
_g_test_watcher_remove_pid (self->priv->bus_pid);
g_spawn_close_pid (self->priv->bus_pid);
self->priv->bus_pid = 0;
g_free (self->priv->bus_address);
self->priv->bus_address = NULL;
}
/**
* g_test_dbus_new:
* @flags: a #GTestDBusFlags
*
* Create a new #GTestDBus object.
*
* Returns: (transfer full): a new #GTestDBus.
*/
GTestDBus *
g_test_dbus_new (GTestDBusFlags flags)
{
return g_object_new (G_TYPE_TEST_DBUS,
"flags", flags,
NULL);
}
/**
* g_test_dbus_get_flags:
* @self: a #GTestDBus
*
* Get the flags of the #GTestDBus object.
*
* Returns: the value of #GTestDBus:flags property
*/
GTestDBusFlags
g_test_dbus_get_flags (GTestDBus *self)
{
g_return_val_if_fail (G_IS_TEST_DBUS (self), G_TEST_DBUS_NONE);
return self->priv->flags;
}
/**
* g_test_dbus_get_bus_address:
* @self: a #GTestDBus
*
* Get the address on which dbus-daemon is running. If g_test_dbus_up() has not
* been called yet, %NULL is returned. This can be used with
* g_dbus_connection_new_for_address().
*
* Returns: (nullable): the address of the bus, or %NULL.
*/
const gchar *
g_test_dbus_get_bus_address (GTestDBus *self)
{
g_return_val_if_fail (G_IS_TEST_DBUS (self), NULL);
return self->priv->bus_address;
}
/**
* g_test_dbus_add_service_dir:
* @self: a #GTestDBus
* @path: path to a directory containing .service files
*
* Add a path where dbus-daemon will look up .service files. This can't be
* called after g_test_dbus_up().
*/
void
g_test_dbus_add_service_dir (GTestDBus *self,
const gchar *path)
{
g_return_if_fail (G_IS_TEST_DBUS (self));
g_return_if_fail (self->priv->bus_address == NULL);
g_ptr_array_add (self->priv->service_dirs, g_strdup (path));
}
/**
* g_test_dbus_up:
* @self: a #GTestDBus
*
* Start a dbus-daemon instance and set DBUS_SESSION_BUS_ADDRESS. After this
* call, it is safe for unit tests to start sending messages on the session bus.
*
* If this function is called from setup callback of g_test_add(),
* g_test_dbus_down() must be called in its teardown callback.
*
* If this function is called from unit test's main(), then g_test_dbus_down()
* must be called after g_test_run().
*/
void
g_test_dbus_up (GTestDBus *self)
{
g_return_if_fail (G_IS_TEST_DBUS (self));
g_return_if_fail (self->priv->bus_address == NULL);
g_return_if_fail (!self->priv->up);
start_daemon (self);
g_test_dbus_unset ();
g_setenv ("DBUS_SESSION_BUS_ADDRESS", self->priv->bus_address, TRUE);
self->priv->up = TRUE;
}
/**
* g_test_dbus_stop:
* @self: a #GTestDBus
*
* Stop the session bus started by g_test_dbus_up().
*
* Unlike g_test_dbus_down(), this won't verify the #GDBusConnection
* singleton returned by g_bus_get() or g_bus_get_sync() is destroyed. Unit
* tests wanting to verify behaviour after the session bus has been stopped
* can use this function but should still call g_test_dbus_down() when done.
*/
void
g_test_dbus_stop (GTestDBus *self)
{
g_return_if_fail (G_IS_TEST_DBUS (self));
g_return_if_fail (self->priv->bus_address != NULL);
stop_daemon (self);
}
/**
* g_test_dbus_down:
* @self: a #GTestDBus
*
* Stop the session bus started by g_test_dbus_up().
*
* This will wait for the singleton returned by g_bus_get() or g_bus_get_sync()
* to be destroyed. This is done to ensure that the next unit test won't get a
* leaked singleton from this test.
*/
void
g_test_dbus_down (GTestDBus *self)
{
GDBusConnection *connection;
g_return_if_fail (G_IS_TEST_DBUS (self));
g_return_if_fail (self->priv->up);
connection = _g_bus_get_singleton_if_exists (G_BUS_TYPE_SESSION);
if (connection != NULL)
g_dbus_connection_set_exit_on_close (connection, FALSE);
if (self->priv->bus_address != NULL)
stop_daemon (self);
if (connection != NULL)
_g_object_unref_and_wait_weak_notify (connection);
g_test_dbus_unset ();
_g_bus_forget_singleton (G_BUS_TYPE_SESSION);
self->priv->up = FALSE;
}
/**
* g_test_dbus_unset:
*
* Unset DISPLAY and DBUS_SESSION_BUS_ADDRESS env variables to ensure the test
* won't use user's session bus.
*
* This is useful for unit tests that want to verify behaviour when no session
* bus is running. It is not necessary to call this if unit test already calls
* g_test_dbus_up() before acquiring the session bus.
*/
void
g_test_dbus_unset (void)
{
g_unsetenv ("DISPLAY");
g_unsetenv ("DBUS_SESSION_BUS_ADDRESS");
g_unsetenv ("DBUS_STARTER_ADDRESS");
g_unsetenv ("DBUS_STARTER_BUS_TYPE");
/* avoid using XDG_RUNTIME_DIR/bus */
g_unsetenv ("XDG_RUNTIME_DIR");
}
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