src/seat-unity.c

   1 /*
   2  * Copyright (C) 2012-2013 Robert Ancell.
   3  * Author: Robert Ancell <robert.ancell@canonical.com>
   4  *
   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
   9  * license.
  10  */
  11
  12 #include <string.h>
  13 #include <fcntl.h>
  14 #include <errno.h>
  15 #include <glib/gstdio.h>
  16
  17 #include "seat-unity.h"
  18 #include "configuration.h"
  19 #include "unity-system-compositor.h"
  20 #include "x-server-local.h"
  21 #include "mir-server.h"
  22 #include "vt.h"
  23 #include "plymouth.h"
  24
  25 struct SeatUnityPrivate
  26 {
  27     /* System compositor */
  28     UnitySystemCompositor *compositor;
  29
  30     /* X server being used for XDMCP */
  31     XServerLocal *xdmcp_x_server;
  32
  33     /* Next Mir ID to use for a Mir sessions, X server and greeters */
  34     gint next_session_id;
  35     gint next_x_server_id;
  36     gint next_greeter_id;
  37
  38     /* The currently visible session */
  39     Session *active_session;
  40     DisplayServer *active_display_server;
  41 };
  42
  43 G_DEFINE_TYPE (SeatUnity, seat_unity, SEAT_TYPE);
  44
  45 static XServerLocal *create_x_server (Seat *seat);
  46
  47 static void
  48 seat_unity_setup (Seat *seat)
  49 {
  50     seat_set_supports_multi_session (seat, TRUE);
  51     SEAT_CLASS (seat_unity_parent_class)->setup (seat);
  52 }
  53
  54 static void
  55 check_stopped (SeatUnity *seat)
  56 {
  57     if (!seat->priv->compositor && !seat->priv->xdmcp_x_server)
  58         SEAT_CLASS (seat_unity_parent_class)->stop (SEAT (seat));
  59 }
  60
  61 static void
  62 xdmcp_x_server_stopped_cb (DisplayServer *display_server, Seat *seat)
  63 {
  64     l_debug (seat, "XDMCP X server stopped");
  65
  66     g_signal_handlers_disconnect_matched (SEAT_UNITY (seat)->priv->xdmcp_x_server, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, seat);
  67     SEAT_UNITY (seat)->priv->xdmcp_x_server = NULL;
  68
  69     g_object_unref (display_server);
  70
  71     if (seat_get_is_stopping (seat))
  72         check_stopped (SEAT_UNITY (seat));
  73     else
  74         seat_stop (seat);
  75 }
  76
  77 static void
  78 compositor_ready_cb (UnitySystemCompositor *compositor, SeatUnity *seat)
  79 {
  80     const gchar *xdmcp_manager = NULL;
  81
  82     l_debug (seat, "Compositor ready");
  83
  84     /* If running as an XDMCP client then just start an X server */
  85     xdmcp_manager = seat_get_string_property (SEAT (seat), "xdmcp-manager");
  86     if (xdmcp_manager)
  87     {
  88         const gchar *key_name = NULL;
  89         gint port = 0;
  90
  91         seat->priv->xdmcp_x_server = create_x_server (SEAT (seat));
  92         x_server_local_set_xdmcp_server (seat->priv->xdmcp_x_server, xdmcp_manager);
  93         port = seat_get_integer_property (SEAT (seat), "xdmcp-port");
  94         if (port > 0)
  95             x_server_local_set_xdmcp_port (seat->priv->xdmcp_x_server, port);
  96         key_name = seat_get_string_property (SEAT (seat), "xdmcp-key");
  97         if (key_name)
  98         {
  99             gchar *path;
 100             GKeyFile *keys;
 101             gboolean result;
 102             GError *error = NULL;
 103
 104             path = g_build_filename (config_get_directory (config_get_instance ()), "keys.conf", NULL);
 105
 106             keys = g_key_file_new ();
 107             result = g_key_file_load_from_file (keys, path, G_KEY_FILE_NONE, &error);
 108             if (error)
 109                 l_debug (seat, "Error getting key %s", error->message);
 110             g_clear_error (&error);
 111
 112             if (result)
 113             {
 114                 gchar *key = NULL;
 115
 116                 if (g_key_file_has_key (keys, "keyring", key_name, NULL))
 117                     key = g_key_file_get_string (keys, "keyring", key_name, NULL);
 118                 else
 119                     l_debug (seat, "Key %s not defined", key_name);
 120
 121                 if (key)
 122                     x_server_local_set_xdmcp_key (seat->priv->xdmcp_x_server, key);
 123                 g_free (key);
 124             }
 125
 126             g_free (path);
 127             g_key_file_free (keys);
 128         }
 129
 130         g_signal_connect (seat->priv->xdmcp_x_server, DISPLAY_SERVER_SIGNAL_STOPPED, G_CALLBACK (xdmcp_x_server_stopped_cb), seat);
 131         if (!display_server_start (DISPLAY_SERVER (seat->priv->xdmcp_x_server)))
 132             seat_stop (SEAT (seat));
 133     }
 134
 135     SEAT_CLASS (seat_unity_parent_class)->start (SEAT (seat));
 136 }
 137
 138 static void
 139 compositor_stopped_cb (UnitySystemCompositor *compositor, SeatUnity *seat)
 140 {
 141     l_debug (seat, "Compositor stopped");
 142
 143     g_clear_object (&seat->priv->compositor);
 144
 145     if (seat_get_is_stopping (SEAT (seat)))
 146         check_stopped (seat);
 147     else
 148         seat_stop (SEAT (seat));
 149 }
 150
 151 static gboolean
 152 seat_unity_start (Seat *seat)
 153 {
 154     gint vt = -1;
 155     int timeout;
 156
 157     /* Replace Plymouth if it is running */
 158     if (plymouth_get_is_active () && plymouth_has_active_vt ())
 159     {
 160         gint active_vt = vt_get_active ();
 161         if (active_vt >= vt_get_min ())
 162         {
 163             vt = active_vt;
 164             plymouth_quit (TRUE);
 165         }
 166         else
 167             l_debug (seat, "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 ());
 168     }
 169     if (plymouth_get_is_active ())
 170         plymouth_quit (FALSE);
 171     if (vt < 0)
 172         vt = vt_can_multi_seat () ? vt_get_unused () : 0;
 173     if (vt < 0)
 174     {
 175         l_debug (seat, "Failed to get a VT to run on");
 176         return FALSE;
 177     }
 178
 179     timeout = seat_get_integer_property (SEAT (seat), "unity-compositor-timeout");
 180     if (timeout <= 0)
 181         timeout = 60;
 182
 183     SEAT_UNITY (seat)->priv->compositor = unity_system_compositor_new ();
 184     g_signal_connect (SEAT_UNITY (seat)->priv->compositor, DISPLAY_SERVER_SIGNAL_READY, G_CALLBACK (compositor_ready_cb), seat);
 185     g_signal_connect (SEAT_UNITY (seat)->priv->compositor, DISPLAY_SERVER_SIGNAL_STOPPED, G_CALLBACK (compositor_stopped_cb), seat);
 186     unity_system_compositor_set_command (SEAT_UNITY (seat)->priv->compositor, seat_get_string_property (SEAT (seat), "unity-compositor-command"));
 187     unity_system_compositor_set_vt (SEAT_UNITY (seat)->priv->compositor, vt);
 188     unity_system_compositor_set_timeout (SEAT_UNITY (seat)->priv->compositor, timeout);
 189
 190     return display_server_start (DISPLAY_SERVER (SEAT_UNITY (seat)->priv->compositor));
 191 }
 192
 193 static XServerLocal *
 194 create_x_server (Seat *seat)
 195 {
 196     XServerLocal *x_server;
 197     const gchar *command = NULL, *layout = NULL, *config_file = NULL;
 198     gboolean allow_tcp;
 199     gchar *id;
 200
 201     l_debug (seat, "Starting X server on Unity compositor");
 202
 203     x_server = x_server_local_new ();
 204
 205     command = seat_get_string_property (seat, "xmir-command");
 206     /* Fall back to using X if Xmir is not available as this was the previous way XMir worked */
 207     if (strcmp (command, "Xmir") == 0 && !g_find_program_in_path ("Xmir"))
 208         command = seat_get_string_property (seat, "xserver-command");
 209     x_server_local_set_command (x_server, command);
 210
 211     id = g_strdup_printf ("x-%d", SEAT_UNITY (seat)->priv->next_x_server_id);
 212     SEAT_UNITY (seat)->priv->next_x_server_id++;
 213     x_server_local_set_mir_id (x_server, id);
 214     x_server_local_set_mir_socket (x_server, unity_system_compositor_get_socket (SEAT_UNITY (seat)->priv->compositor));
 215     g_free (id);
 216
 217     layout = seat_get_string_property (seat, "xserver-layout");
 218     if (layout)
 219         x_server_local_set_layout (x_server, layout);
 220
 221     x_server_local_set_xdg_seat (x_server, seat_get_name (seat));
 222
 223     config_file = seat_get_string_property (seat, "xserver-config");
 224     if (config_file)
 225         x_server_local_set_config (x_server, config_file);
 226
 227     allow_tcp = seat_get_boolean_property (seat, "xserver-allow-tcp");
 228     x_server_local_set_allow_tcp (x_server, allow_tcp);
 229
 230     return x_server;
 231 }
 232
 233 static DisplayServer *
 234 create_mir_server (Seat *seat)
 235 {
 236     MirServer *mir_server;
 237
 238     mir_server = mir_server_new ();
 239     mir_server_set_parent_socket (mir_server, unity_system_compositor_get_socket (SEAT_UNITY (seat)->priv->compositor));
 240
 241     return DISPLAY_SERVER (mir_server);
 242 }
 243
 244 static DisplayServer *
 245 seat_unity_create_display_server (Seat *seat, Session *session)
 246 {
 247     const gchar *session_type;
 248
 249     session_type = session_get_session_type (session);
 250     if (strcmp (session_type, "x") == 0)
 251         return DISPLAY_SERVER (create_x_server (seat));
 252     else if (strcmp (session_type, "mir") == 0)
 253         return create_mir_server (seat);
 254     else
 255     {
 256         l_warning (seat, "Can't create unsupported display server '%s'", session_type);
 257         return NULL;
 258     }
 259 }
 260
 261 static Greeter *
 262 seat_unity_create_greeter_session (Seat *seat)
 263 {
 264     Greeter *greeter_session;
 265     gchar *id;
 266     gint vt;
 267
 268     greeter_session = SEAT_CLASS (seat_unity_parent_class)->create_greeter_session (seat);
 269     session_set_env (SESSION (greeter_session), "XDG_SEAT", seat_get_name (seat));
 270
 271     id = g_strdup_printf ("greeter-%d", SEAT_UNITY (seat)->priv->next_greeter_id);
 272     SEAT_UNITY (seat)->priv->next_greeter_id++;
 273     session_set_env (SESSION (greeter_session), "MIR_SERVER_NAME", id);
 274     g_free (id);
 275
 276     vt = display_server_get_vt (DISPLAY_SERVER (SEAT_UNITY (seat)->priv->compositor));
 277     if (vt >= 0)
 278     {
 279         gchar *value = g_strdup_printf ("%d", vt);
 280         session_set_env (SESSION (greeter_session), "XDG_VTNR", value);
 281         g_free (value);
 282     }
 283
 284     return greeter_session;
 285 }
 286
 287 static Session *
 288 seat_unity_create_session (Seat *seat)
 289 {
 290     Session *session;
 291     gchar *id;
 292     gint vt;
 293
 294     session = SEAT_CLASS (seat_unity_parent_class)->create_session (seat);
 295     session_set_env (session, "XDG_SEAT", seat_get_name (seat));
 296
 297     id = g_strdup_printf ("session-%d", SEAT_UNITY (seat)->priv->next_session_id);
 298     SEAT_UNITY (seat)->priv->next_session_id++;
 299     session_set_env (session, "MIR_SERVER_NAME", id);
 300     g_free (id);
 301
 302     vt = display_server_get_vt (DISPLAY_SERVER (SEAT_UNITY (seat)->priv->compositor));
 303     if (vt >= 0)
 304     {
 305         gchar *value = g_strdup_printf ("%d", vt);
 306         session_set_env (SESSION (session), "XDG_VTNR", value);
 307         g_free (value);
 308     }
 309
 310     return session;
 311 }
 312
 313 static void
 314 seat_unity_set_active_session (Seat *seat, Session *session)
 315 {
 316     DisplayServer *display_server;
 317
 318     if (session == SEAT_UNITY (seat)->priv->active_session)
 319         return;
 320     SEAT_UNITY (seat)->priv->active_session = g_object_ref (session);
 321
 322     display_server = session_get_display_server (session);
 323     if (SEAT_UNITY (seat)->priv->active_display_server != display_server)
 324     {
 325         const gchar *id = NULL;
 326
 327         SEAT_UNITY (seat)->priv->active_display_server = g_object_ref (display_server);
 328
 329         if (IS_X_SERVER_LOCAL (display_server))
 330             id = x_server_local_get_mir_id (X_SERVER_LOCAL (display_server));
 331         else
 332             id = session_get_env (session, "MIR_SERVER_NAME");
 333
 334         if (id)
 335         {
 336             l_debug (seat, "Switching to Mir session %s", id);
 337             unity_system_compositor_set_active_session (SEAT_UNITY (seat)->priv->compositor, id);
 338         }
 339         else
 340             l_warning (seat, "Failed to work out session ID");
 341     }
 342
 343     SEAT_CLASS (seat_unity_parent_class)->set_active_session (seat, session);
 344 }
 345
 346 static Session *
 347 seat_unity_get_active_session (Seat *seat)
 348 {
 349     return SEAT_UNITY (seat)->priv->active_session;
 350 }
 351
 352 static void
 353 seat_unity_set_next_session (Seat *seat, Session *session)
 354 {
 355     DisplayServer *display_server;
 356     const gchar *id = NULL;
 357
 358     if (!session)
 359         return;
 360
 361     display_server = session_get_display_server (session);
 362
 363     if (IS_X_SERVER_LOCAL (display_server))
 364         id = x_server_local_get_mir_id (X_SERVER_LOCAL (display_server));
 365     else
 366         id = session_get_env (session, "MIR_SERVER_NAME");
 367
 368     if (id)
 369     {
 370         l_debug (seat, "Marking Mir session %s as the next session", id);
 371         unity_system_compositor_set_next_session (SEAT_UNITY (seat)->priv->compositor, id);
 372     }
 373     else
 374     {
 375         l_debug (seat, "Failed to work out session ID to mark");
 376     }
 377
 378     SEAT_CLASS (seat_unity_parent_class)->set_next_session (seat, session);
 379 }
 380
 381 static void
 382 seat_unity_run_script (Seat *seat, DisplayServer *display_server, Process *script)
 383 {
 384     if (IS_X_SERVER_LOCAL (display_server))
 385     {
 386         XServerLocal *x_server;
 387         const gchar *path;
 388
 389         x_server = X_SERVER_LOCAL (display_server);
 390         path = x_server_local_get_authority_file_path (x_server);
 391         process_set_env (script, "DISPLAY", x_server_get_address (X_SERVER (x_server)));
 392         process_set_env (script, "XAUTHORITY", path);
 393     }
 394
 395     SEAT_CLASS (seat_unity_parent_class)->run_script (seat, display_server, script);
 396 }
 397
 398 static void
 399 seat_unity_stop (Seat *seat)
 400 {
 401     /* Stop the compositor first */
 402     if (SEAT_UNITY (seat)->priv->compositor)
 403         display_server_stop (DISPLAY_SERVER (SEAT_UNITY (seat)->priv->compositor));
 404
 405     /* Stop the XDMCP X server first */
 406     if (SEAT_UNITY (seat)->priv->xdmcp_x_server)
 407         display_server_stop (DISPLAY_SERVER (SEAT_UNITY (seat)->priv->xdmcp_x_server));
 408
 409     check_stopped (SEAT_UNITY (seat));
 410 }
 411
 412 static void
 413 seat_unity_init (SeatUnity *seat)
 414 {
 415     seat->priv = G_TYPE_INSTANCE_GET_PRIVATE (seat, SEAT_UNITY_TYPE, SeatUnityPrivate);
 416 }
 417
 418 static void
 419 seat_unity_finalize (GObject *object)
 420 {
 421     SeatUnity *seat = SEAT_UNITY (object);
 422
 423     g_clear_object (&seat->priv->compositor);
 424     if (seat->priv->xdmcp_x_server)
 425     {
 426         g_signal_handlers_disconnect_matched (seat->priv->xdmcp_x_server, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, seat);
 427         g_object_unref (seat->priv->xdmcp_x_server);
 428     }
 429     g_clear_object (&seat->priv->active_session);
 430     g_clear_object (&seat->priv->active_display_server);
 431
 432     G_OBJECT_CLASS (seat_unity_parent_class)->finalize (object);
 433 }
 434
 435 static void
 436 seat_unity_class_init (SeatUnityClass *klass)
 437 {
 438     GObjectClass *object_class = G_OBJECT_CLASS (klass);
 439     SeatClass *seat_class = SEAT_CLASS (klass);
 440
 441     object_class->finalize = seat_unity_finalize;
 442     seat_class->setup = seat_unity_setup;
 443     seat_class->start = seat_unity_start;
 444     seat_class->create_display_server = seat_unity_create_display_server;
 445     seat_class->create_greeter_session = seat_unity_create_greeter_session;
 446     seat_class->create_session = seat_unity_create_session;
 447     seat_class->set_active_session = seat_unity_set_active_session;
 448     seat_class->get_active_session = seat_unity_get_active_session;
 449     seat_class->set_next_session = seat_unity_set_next_session;
 450     seat_class->run_script = seat_unity_run_script;
 451     seat_class->stop = seat_unity_stop;
 452
 453     g_type_class_add_private (klass, sizeof (SeatUnityPrivate));
 454 }