1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
* vi:set noexpandtab tabstop=8 shiftwidth=8:
*
* Copyright (C) 2017 Richard Hughes <richard@hughsie.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include "config.h"
#include <gio/gio.h>
#include <stdlib.h>
#define GS_BINARY_NAME "gnome-software"
#define GS_DBUS_BUS_NAME "org.gnome.Software"
#define GS_DBUS_OBJECT_PATH "/org/gnome/Software"
#define GS_DBUS_INTERFACE_NAME "org.gtk.Actions"
typedef struct {
GMainLoop *loop;
GDBusConnection *connection;
gboolean is_running;
gboolean timed_out;
} GsRestarterPrivate;
static void
gs_restarter_on_name_appeared_cb (GDBusConnection *connection,
const gchar *name,
const gchar *name_owner,
gpointer user_data)
{
GsRestarterPrivate *priv = (GsRestarterPrivate *) user_data;
priv->is_running = TRUE;
g_debug ("%s appeared", GS_DBUS_BUS_NAME);
if (g_main_loop_is_running (priv->loop))
g_main_loop_quit (priv->loop);
}
static void
gs_restarter_on_name_vanished_cb (GDBusConnection *connection,
const gchar *name,
gpointer user_data)
{
GsRestarterPrivate *priv = (GsRestarterPrivate *) user_data;
priv->is_running = FALSE;
g_debug ("%s vanished", GS_DBUS_BUS_NAME);
if (g_main_loop_is_running (priv->loop))
g_main_loop_quit (priv->loop);
}
static gboolean
gs_restarter_loop_timeout_cb (gpointer user_data)
{
GsRestarterPrivate *priv = (GsRestarterPrivate *) user_data;
priv->timed_out = TRUE;
g_main_loop_quit (priv->loop);
return TRUE;
}
static gboolean
gs_restarter_wait_for_timeout (GsRestarterPrivate *priv,
guint timeout_ms,
GError **error)
{
guint timer_id;
priv->timed_out = FALSE;
timer_id = g_timeout_add (timeout_ms, gs_restarter_loop_timeout_cb, priv);
g_main_loop_run (priv->loop);
g_source_remove (timer_id);
if (priv->timed_out) {
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_TIMED_OUT,
"Waited for %ums", timeout_ms);
return FALSE;
}
return TRUE;
}
static GsRestarterPrivate *
gs_restarter_private_new (void)
{
GsRestarterPrivate *priv = g_new0 (GsRestarterPrivate, 1);
priv->loop = g_main_loop_new (NULL, FALSE);
return priv;
}
static void
gs_restarter_private_free (GsRestarterPrivate *priv)
{
if (priv->connection != NULL)
g_object_unref (priv->connection);
g_main_loop_unref (priv->loop);
g_free (priv);
}
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GsRestarterPrivate, gs_restarter_private_free)
static gboolean
gs_restarter_create_new_process (GsRestarterPrivate *priv, GError **error)
{
g_autofree gchar *binary_filename = NULL;
/* start executable */
binary_filename = g_build_filename (BINDIR, GS_BINARY_NAME, NULL);
g_debug ("starting new binary %s", binary_filename);
if (!g_spawn_command_line_async (binary_filename, error))
return FALSE;
/* wait for the bus name to appear */
if (!gs_restarter_wait_for_timeout (priv, 15000, error)) {
g_prefix_error (error, "%s did not appear: ", GS_DBUS_BUS_NAME);
return FALSE;
}
return TRUE;
}
static gboolean
gs_restarter_destroy_old_process (GsRestarterPrivate *priv, GError **error)
{
GVariantBuilder args_params;
GVariantBuilder args_platform_data;
g_autoptr(GVariant) reply = NULL;
/* call a GtkAction */
g_variant_builder_init (&args_params, g_variant_type_new ("av"));
g_variant_builder_init (&args_platform_data, g_variant_type_new ("a{sv}"));
reply = g_dbus_connection_call_sync (priv->connection,
GS_DBUS_BUS_NAME,
GS_DBUS_OBJECT_PATH,
GS_DBUS_INTERFACE_NAME,
"Activate",
g_variant_new ("(sava{sv})",
"shutdown",
&args_params,
&args_platform_data),
NULL,
G_DBUS_CALL_FLAGS_NO_AUTO_START,
5000,
NULL,
error);
if (reply == NULL) {
g_prefix_error (error, "Failed to send RequestShutdown: ");
return FALSE;
}
/* wait for the name to disappear from the bus */
if (!gs_restarter_wait_for_timeout (priv, 30000, error)) {
g_prefix_error (error, "Failed to see %s vanish: ", GS_DBUS_BUS_NAME);
return FALSE;
}
return TRUE;
}
static gboolean
gs_restarter_setup_watcher (GsRestarterPrivate *priv, GError **error)
{
/* watch the name appear and vanish */
priv->connection = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, error);
if (priv->connection == NULL) {
g_prefix_error (error, "Failed to get D-Bus connection: ");
return FALSE;
}
g_bus_watch_name_on_connection (priv->connection,
GS_DBUS_BUS_NAME,
G_BUS_NAME_WATCHER_FLAGS_NONE,
gs_restarter_on_name_appeared_cb,
gs_restarter_on_name_vanished_cb,
priv,
NULL);
/* wait for one of the callbacks to be called */
if (!gs_restarter_wait_for_timeout (priv, 50, error)) {
g_prefix_error (error, "Failed to watch %s: ", GS_DBUS_BUS_NAME);
return FALSE;
}
return TRUE;
}
int
main (int argc, char **argv)
{
g_autoptr(GsRestarterPrivate) priv = NULL;
g_autoptr(GError) error = NULL;
/* show all debugging */
g_setenv ("G_MESSAGES_DEBUG", "all", TRUE);
/* set up the watcher */
priv = gs_restarter_private_new ();
if (!gs_restarter_setup_watcher (priv, &error)) {
g_warning ("Failed to set up: %s", error->message);
return EXIT_FAILURE;
}
/* kill the old process */
if (priv->is_running) {
if (!gs_restarter_destroy_old_process (priv, &error)) {
g_warning ("Failed to quit service: %s", error->message);
return EXIT_FAILURE;
}
}
/* start a new process */
if (!gs_restarter_create_new_process (priv, &error)) {
g_warning ("Failed to start service: %s", error->message);
return EXIT_FAILURE;
}
/* success */
g_debug ("%s process successfully restarted", GS_DBUS_BUS_NAME);
return EXIT_SUCCESS;
}
|
