2 * Copyright (C) 2012-2013 Robert Ancell.
3 * Author: Robert Ancell <robert.ancell@canonical.com>
5 * This program is free software: you can redistribute it and/or modify it under
6 * the terms of the GNU General Public License as published by the Free Software
7 * Foundation, either version 3 of the License, or (at your option) any later
8 * version. See http://www.gnu.org/copyleft/gpl.html the full text of the
16 #include "seat-unity.h"
17 #include "configuration.h"
18 #include "xserver-local.h"
28 USC_MESSAGE_READY = 2,
29 USC_MESSAGE_SESSION_CONNECTED = 3,
30 USC_MESSAGE_SET_ACTIVE_SESSION = 4
33 struct SeatUnityPrivate
35 /* VT we are running on */
38 /* TRUE if waiting for X server to start before stopping Plymouth */
39 gboolean stopping_plymouth;
44 /* Filename of Mir socket */
45 gchar *mir_socket_filename;
47 /* Pipes to communicate with compositor */
48 int to_compositor_pipe[2];
49 int from_compositor_pipe[2];
51 /* IO channel listening on for messages from the compositor */
52 GIOChannel *from_compositor_channel;
54 /* TRUE when the compositor indicates it is ready */
55 gboolean compositor_ready;
57 /* Buffer reading from channel */
59 gsize read_buffer_length;
60 gsize read_buffer_n_used;
62 /* Compositor process */
63 Process *compositor_process;
65 /* Timeout when waiting for compositor to start */
66 guint compositor_timeout;
68 /* Next Mir ID to use for a compositor client */
71 /* TRUE if using VT switching fallback */
72 gboolean use_vt_switching;
74 /* The currently visible session */
75 Session *active_session;
76 DisplayServer *active_display_server;
79 G_DEFINE_TYPE (SeatUnity, seat_unity, SEAT_TYPE);
82 seat_unity_setup (Seat *seat)
84 seat_set_can_switch (seat, TRUE);
85 SEAT_CLASS (seat_unity_parent_class)->setup (seat);
89 compositor_stopped_cb (Process *process, SeatUnity *seat)
91 if (seat->priv->compositor_timeout != 0)
92 g_source_remove (seat->priv->compositor_timeout);
93 seat->priv->compositor_timeout = 0;
95 /* Finished with the VT */
96 vt_unref (seat->priv->vt);
99 if (seat_get_is_stopping (SEAT (seat)))
101 SEAT_CLASS (seat_unity_parent_class)->stop (SEAT (seat));
105 /* If stopped before it was ready, then revert to VT mode */
106 if (!seat->priv->compositor_ready)
108 g_debug ("Compositor failed to start, switching to VT mode");
109 seat->priv->use_vt_switching = TRUE;
110 SEAT_CLASS (seat_unity_parent_class)->start (SEAT (seat));
114 g_debug ("Stopping Unity seat, compositor terminated");
116 if (seat->priv->stopping_plymouth)
118 g_debug ("Stopping Plymouth, compositor failed to start");
119 plymouth_quit (FALSE);
120 seat->priv->stopping_plymouth = FALSE;
123 seat_stop (SEAT (seat));
127 compositor_run_cb (Process *process, SeatUnity *seat)
131 /* Make input non-blocking */
132 fd = open ("/dev/null", O_RDONLY);
133 dup2 (fd, STDIN_FILENO);
136 /* Redirect output to logfile */
137 if (seat->priv->log_file)
141 fd = g_open (seat->priv->log_file, O_WRONLY | O_CREAT | O_TRUNC, 0600);
143 g_warning ("Failed to open log file %s: %s", seat->priv->log_file, g_strerror (errno));
146 dup2 (fd, STDOUT_FILENO);
147 dup2 (fd, STDERR_FILENO);
154 write_message (SeatUnity *seat, guint16 id, const guint8 *payload, guint16 payload_length)
157 gsize data_length = 4 + payload_length;
159 data = g_malloc (data_length);
162 data[2] = payload_length >> 8;
163 data[3] = payload_length & 0xFF;
164 memcpy (data + 4, payload, payload_length);
167 if (write (seat->priv->to_compositor_pipe[1], data, data_length) != data_length)
168 g_warning ("Failed to write to compositor: %s", strerror (errno));
172 read_cb (GIOChannel *source, GIOCondition condition, gpointer data)
174 SeatUnity *seat = data;
176 guint16 id, payload_length;
179 if (condition == G_IO_HUP)
181 g_debug ("Compositor closed communication channel");
185 /* Work out how much required for a message */
186 if (seat->priv->read_buffer_n_used < 4)
187 n_to_read = 4 - seat->priv->read_buffer_n_used;
190 payload_length = seat->priv->read_buffer[2] << 8 | seat->priv->read_buffer[3];
191 n_to_read = 4 + payload_length - seat->priv->read_buffer_n_used;
194 /* Read from compositor */
197 gsize n_total, n_read = 0;
199 GError *error = NULL;
201 n_total = seat->priv->read_buffer_n_used + n_to_read;
202 if (seat->priv->read_buffer_length < n_total)
203 seat->priv->read_buffer = g_realloc (seat->priv->read_buffer, n_total);
205 status = g_io_channel_read_chars (source,
206 seat->priv->read_buffer + seat->priv->read_buffer_n_used,
211 g_warning ("Failed to read from compositor: %s", error->message);
212 if (status != G_IO_STATUS_NORMAL)
214 g_clear_error (&error);
215 seat->priv->read_buffer_n_used += n_read;
219 if (seat->priv->read_buffer_n_used < 4)
221 id = seat->priv->read_buffer[0] << 8 | seat->priv->read_buffer[1];
222 payload_length = seat->priv->read_buffer[2] << 8 | seat->priv->read_buffer[3];
225 if (seat->priv->read_buffer_n_used < 4 + payload_length)
227 payload = seat->priv->read_buffer + 4;
231 case USC_MESSAGE_PING:
233 write_message (seat, USC_MESSAGE_PONG, NULL, 0);
235 case USC_MESSAGE_PONG:
238 case USC_MESSAGE_READY:
240 if (!seat->priv->compositor_ready)
242 seat->priv->compositor_ready = TRUE;
243 g_debug ("Compositor ready");
244 g_source_remove (seat->priv->compositor_timeout);
245 seat->priv->compositor_timeout = 0;
246 SEAT_CLASS (seat_unity_parent_class)->start (SEAT (seat));
249 case USC_MESSAGE_SESSION_CONNECTED:
250 g_debug ("SESSION CONNECTED");
253 g_warning ("Ingoring unknown message %d with %d octets from system compositor", id, payload_length);
258 seat->priv->read_buffer_n_used = 0;
264 get_absolute_command (const gchar *command)
267 gchar *absolute_binary, *absolute_command = NULL;
269 tokens = g_strsplit (command, " ", 2);
271 absolute_binary = g_find_program_in_path (tokens[0]);
275 absolute_command = g_strjoin (" ", absolute_binary, tokens[1], NULL);
277 absolute_command = g_strdup (absolute_binary);
278 g_free (absolute_binary);
281 absolute_command = g_strdup (command);
285 return absolute_command;
289 compositor_timeout_cb (gpointer data)
291 SeatUnity *seat = data;
293 /* Stop the compositor - it is not working */
294 process_stop (seat->priv->compositor_process);
300 seat_unity_start (Seat *seat)
302 const gchar *compositor_command;
303 gchar *command, *absolute_command, *dir;
307 /* Replace Plymouth if it is running */
308 if (plymouth_get_is_active () && plymouth_has_active_vt ())
310 gint active_vt = vt_get_active ();
311 if (active_vt >= vt_get_min ())
313 g_debug ("Compositor will replace Plymouth");
314 SEAT_UNITY (seat)->priv->vt = active_vt;
315 plymouth_deactivate ();
318 g_debug ("Plymouth is running on VT %d, but this is less than the configured minimum of %d so not replacing it", active_vt, vt_get_min ());
320 if (SEAT_UNITY (seat)->priv->vt < 0)
321 SEAT_UNITY (seat)->priv->vt = vt_get_unused ();
322 if (SEAT_UNITY (seat)->priv->vt < 0)
324 g_debug ("Failed to get a VT to run on");
327 vt_ref (SEAT_UNITY (seat)->priv->vt);
329 /* Create pipes to talk to compositor */
330 if (pipe (SEAT_UNITY (seat)->priv->to_compositor_pipe) < 0 || pipe (SEAT_UNITY (seat)->priv->from_compositor_pipe) < 0)
332 g_debug ("Failed to create compositor pipes: %s", g_strerror (errno));
336 /* Don't allow the daemon end of the pipes to be accessed in the compositor */
337 fcntl (SEAT_UNITY (seat)->priv->to_compositor_pipe[1], F_SETFD, FD_CLOEXEC);
338 fcntl (SEAT_UNITY (seat)->priv->from_compositor_pipe[0], F_SETFD, FD_CLOEXEC);
340 /* Listen for messages from the compositor */
341 SEAT_UNITY (seat)->priv->from_compositor_channel = g_io_channel_unix_new (SEAT_UNITY (seat)->priv->from_compositor_pipe[0]);
342 g_io_add_watch (SEAT_UNITY (seat)->priv->from_compositor_channel, G_IO_IN | G_IO_HUP, read_cb, seat);
345 dir = config_get_string (config_get_instance (), "LightDM", "log-directory");
346 SEAT_UNITY (seat)->priv->log_file = g_build_filename (dir, "unity-system-compositor.log", NULL);
347 g_debug ("Logging to %s", SEAT_UNITY (seat)->priv->log_file);
350 SEAT_UNITY (seat)->priv->mir_socket_filename = g_strdup ("/tmp/mir_socket"); // FIXME: Use this socket by default as XMir is hardcoded to this
351 timeout = seat_get_integer_property (seat, "unity-compositor-timeout");
352 compositor_command = seat_get_string_property (seat, "unity-compositor-command");
353 command = g_strdup_printf ("%s --from-dm-fd %d --to-dm-fd %d --vt %d", compositor_command, SEAT_UNITY (seat)->priv->to_compositor_pipe[0], SEAT_UNITY (seat)->priv->from_compositor_pipe[1], SEAT_UNITY (seat)->priv->vt);
355 absolute_command = get_absolute_command (command);
358 /* Start the compositor */
359 process_set_command (SEAT_UNITY (seat)->priv->compositor_process, absolute_command);
360 g_free (absolute_command);
361 g_signal_connect (SEAT_UNITY (seat)->priv->compositor_process, "stopped", G_CALLBACK (compositor_stopped_cb), seat);
362 g_signal_connect (SEAT_UNITY (seat)->priv->compositor_process, "run", G_CALLBACK (compositor_run_cb), seat);
363 result = process_start (SEAT_UNITY (seat)->priv->compositor_process, FALSE);
365 /* Close compostor ends of the pipes */
366 close (SEAT_UNITY (seat)->priv->to_compositor_pipe[0]);
367 SEAT_UNITY (seat)->priv->to_compositor_pipe[0] = 0;
368 close (SEAT_UNITY (seat)->priv->from_compositor_pipe[1]);
369 SEAT_UNITY (seat)->priv->from_compositor_pipe[1] = 0;
374 /* Connect to the compositor */
375 timeout = seat_get_integer_property (seat, "unity-compositor-timeout");
378 g_debug ("Waiting for system compositor for %ds", timeout);
379 SEAT_UNITY (seat)->priv->compositor_timeout = g_timeout_add (timeout * 1000, compositor_timeout_cb, seat);
384 static DisplayServer *
385 seat_unity_create_display_server (Seat *seat)
387 XServerLocal *xserver;
388 const gchar *command = NULL, *layout = NULL, *config_file = NULL, *xdmcp_manager = NULL, *key_name = NULL;
393 g_debug ("Starting X server on Unity compositor");
395 xserver = xserver_local_new ();
397 if (!SEAT_UNITY (seat)->priv->use_vt_switching)
399 id = g_strdup_printf ("%d", SEAT_UNITY (seat)->priv->next_id);
400 SEAT_UNITY (seat)->priv->next_id++;
401 xserver_local_set_mir_id (xserver, id);
402 xserver_local_set_mir_socket (xserver, SEAT_UNITY (seat)->priv->mir_socket_filename);
406 command = seat_get_string_property (seat, "xserver-command");
408 xserver_local_set_command (xserver, command);
410 layout = seat_get_string_property (seat, "xserver-layout");
412 xserver_local_set_layout (xserver, layout);
414 config_file = seat_get_string_property (seat, "xserver-config");
416 xserver_local_set_config (xserver, config_file);
418 allow_tcp = seat_get_boolean_property (seat, "xserver-allow-tcp");
419 xserver_local_set_allow_tcp (xserver, allow_tcp);
421 xdmcp_manager = seat_get_string_property (seat, "xdmcp-manager");
423 xserver_local_set_xdmcp_server (xserver, xdmcp_manager);
425 port = seat_get_integer_property (seat, "xdmcp-port");
427 xserver_local_set_xdmcp_port (xserver, port);
429 key_name = seat_get_string_property (seat, "xdmcp-key");
435 GError *error = NULL;
437 dir = config_get_string (config_get_instance (), "LightDM", "config-directory");
438 path = g_build_filename (dir, "keys.conf", NULL);
441 keys = g_key_file_new ();
442 result = g_key_file_load_from_file (keys, path, G_KEY_FILE_NONE, &error);
444 g_debug ("Error getting key %s", error->message);
445 g_clear_error (&error);
451 if (g_key_file_has_key (keys, "keyring", key_name, NULL))
452 key = g_key_file_get_string (keys, "keyring", key_name, NULL);
454 g_debug ("Key %s not defined", key_name);
457 xserver_local_set_xdmcp_key (xserver, key);
462 g_key_file_free (keys);
465 return DISPLAY_SERVER (xserver);
469 seat_unity_create_greeter_session (Seat *seat)
471 XGreeter *greeter_session;
473 greeter_session = xgreeter_new ();
474 session_set_env (SESSION (greeter_session), "XDG_SEAT", "seat0");
476 return GREETER (greeter_session);
480 seat_unity_create_session (Seat *seat)
484 session = xsession_new ();
485 session_set_env (SESSION (session), "XDG_SEAT", "seat0");
487 return SESSION (session);
491 seat_unity_set_active_session (Seat *seat, Session *session)
493 DisplayServer *display_server;
495 /* If no compositor, have to use VT switching */
496 if (SEAT_UNITY (seat)->priv->use_vt_switching)
498 gint vt = display_server_get_vt (session_get_display_server (session));
502 SEAT_CLASS (seat_unity_parent_class)->set_active_session (seat, session);
506 if (session == SEAT_UNITY (seat)->priv->active_session)
508 SEAT_UNITY (seat)->priv->active_session = session;
510 display_server = session_get_display_server (session);
511 if (SEAT_UNITY (seat)->priv->active_display_server != display_server)
515 SEAT_UNITY (seat)->priv->active_display_server = display_server;
516 id = xserver_local_get_mir_id (XSERVER_LOCAL (display_server));
518 g_debug ("Switching to Mir session %s", id);
519 write_message (SEAT_UNITY (seat), USC_MESSAGE_SET_ACTIVE_SESSION, id, strlen (id));
522 SEAT_CLASS (seat_unity_parent_class)->set_active_session (seat, session);
526 seat_unity_get_active_session (Seat *seat)
528 if (SEAT_UNITY (seat)->priv->use_vt_switching)
532 vt = vt_get_active ();
536 for (link = seat_get_sessions (seat); link; link = link->next)
538 Session *session = link->data;
539 if (display_server_get_vt (session_get_display_server (session)) == vt)
546 return SEAT_UNITY (seat)->priv->active_session;
550 seat_unity_run_script (Seat *seat, DisplayServer *display_server, Process *script)
553 XServerLocal *xserver;
555 xserver = XSERVER_LOCAL (display_server);
556 path = xserver_local_get_authority_file_path (xserver);
557 process_set_env (script, "DISPLAY", xserver_get_address (XSERVER (xserver)));
558 process_set_env (script, "XAUTHORITY", path);
560 SEAT_CLASS (seat_unity_parent_class)->run_script (seat, display_server, script);
564 seat_unity_stop (Seat *seat)
566 /* Stop the compositor first */
567 if (process_get_is_running (SEAT_UNITY (seat)->priv->compositor_process))
569 process_stop (SEAT_UNITY (seat)->priv->compositor_process);
573 SEAT_CLASS (seat_unity_parent_class)->stop (seat);
577 seat_unity_init (SeatUnity *seat)
579 seat->priv = G_TYPE_INSTANCE_GET_PRIVATE (seat, SEAT_UNITY_TYPE, SeatUnityPrivate);
581 seat->priv->compositor_process = process_new ();
585 seat_unity_finalize (GObject *object)
587 SeatUnity *seat = SEAT_UNITY (object);
589 if (seat->priv->vt >= 0)
590 vt_unref (seat->priv->vt);
591 g_free (seat->priv->log_file);
592 g_free (seat->priv->mir_socket_filename);
593 close (seat->priv->to_compositor_pipe[0]);
594 close (seat->priv->to_compositor_pipe[1]);
595 close (seat->priv->from_compositor_pipe[0]);
596 close (seat->priv->from_compositor_pipe[1]);
597 g_io_channel_unref (seat->priv->from_compositor_channel);
598 g_free (seat->priv->read_buffer);
599 g_object_unref (seat->priv->compositor_process);
601 G_OBJECT_CLASS (seat_unity_parent_class)->finalize (object);
605 seat_unity_class_init (SeatUnityClass *klass)
607 GObjectClass *object_class = G_OBJECT_CLASS (klass);
608 SeatClass *seat_class = SEAT_CLASS (klass);
610 object_class->finalize = seat_unity_finalize;
611 seat_class->setup = seat_unity_setup;
612 seat_class->start = seat_unity_start;
613 seat_class->create_display_server = seat_unity_create_display_server;
614 seat_class->create_greeter_session = seat_unity_create_greeter_session;
615 seat_class->create_session = seat_unity_create_session;
616 seat_class->set_active_session = seat_unity_set_active_session;
617 seat_class->get_active_session = seat_unity_get_active_session;
618 seat_class->run_script = seat_unity_run_script;
619 seat_class->stop = seat_unity_stop;
621 g_type_class_add_private (klass, sizeof (SeatUnityPrivate));