src/seat.c

   1 /*
   2  * Copyright (C) 2010-2011 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 <stdlib.h>
  13 #include <string.h>
  14 #include <sys/wait.h>
  15
  16 #include "seat.h"
  17 #include "configuration.h"
  18 #include "guest-account.h"
  19 #include "greeter.h"
  20 #include "session-config.h"
  21
  22 enum {
  23     SESSION_ADDED,
  24     RUNNING_USER_SESSION,
  25     SESSION_REMOVED,
  26     STOPPED,
  27     LAST_SIGNAL
  28 };
  29 static guint signals[LAST_SIGNAL] = { 0 };
  30
  31 struct SeatPrivate
  32 {
  33     /* Configuration for this seat */
  34     GHashTable *properties;
  35
  36     /* TRUE if able to switch users */
  37     gboolean can_switch;
  38
  39     /* TRUE if display server can be shared for sessions */
  40     gboolean share_display_server;
  41
  42     /* The display servers on this seat */
  43     GList *display_servers;
  44
  45     /* The sessions on this seat */
  46     GList *sessions;
  47
  48     /* The last session set to active */
  49     Session *active_session;
  50
  51     /* The session belonging to the active greeter user */
  52     Session *next_session;
  53
  54     /* The session to set active when it starts */
  55     Session *session_to_activate;
  56
  57     /* TRUE once we have started */
  58     gboolean started;
  59
  60     /* TRUE if stopping this seat (waiting for displays to stop) */
  61     gboolean stopping;
  62
  63     /* TRUE if stopped */
  64     gboolean stopped;
  65 };
  66
  67 /* PAM services to use */
  68 #define GREETER_SERVICE   "lightdm-greeter"
  69 #define USER_SERVICE      "lightdm"
  70 #define AUTOLOGIN_SERVICE "lightdm-autologin"
  71
  72 static void seat_logger_iface_init (LoggerInterface *iface);
  73
  74 G_DEFINE_TYPE_WITH_CODE (Seat, seat, G_TYPE_OBJECT,
  75                          G_IMPLEMENT_INTERFACE (
  76                              LOGGER_TYPE, seat_logger_iface_init));
  77
  78 typedef struct
  79 {
  80     const gchar *name;
  81     GType type;
  82 } SeatModule;
  83 static GHashTable *seat_modules = NULL;
  84
  85 // FIXME: Make a get_display_server() that re-uses display servers if supported
  86 static DisplayServer *create_display_server (Seat *seat, const gchar *session_type);
  87 static Greeter *create_greeter_session (Seat *seat);
  88 static void start_session (Seat *seat, Session *session);
  89
  90 void
  91 seat_register_module (const gchar *name, GType type)
  92 {
  93     SeatModule *module;
  94
  95     if (!seat_modules)
  96         seat_modules = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
  97
  98     g_debug ("Registered seat module %s", name);
  99
 100     module = g_malloc0 (sizeof (SeatModule));
 101     module->name = g_strdup (name);
 102     module->type = type;
 103     g_hash_table_insert (seat_modules, g_strdup (name), module);
 104 }
 105
 106 Seat *
 107 seat_new (const gchar *module_name)
 108 {
 109     Seat *seat;
 110     SeatModule *m = NULL;
 111
 112     g_return_val_if_fail (module_name != NULL, NULL);
 113
 114     if (seat_modules)
 115         m = g_hash_table_lookup (seat_modules, module_name);
 116     if (!m)
 117         return NULL;
 118
 119     seat = g_object_new (m->type, NULL);
 120
 121     return seat;
 122 }
 123
 124 void
 125 seat_set_property (Seat *seat, const gchar *name, const gchar *value)
 126 {
 127     g_return_if_fail (seat != NULL);
 128     g_hash_table_insert (seat->priv->properties, g_strdup (name), g_strdup (value));
 129 }
 130
 131 const gchar *
 132 seat_get_string_property (Seat *seat, const gchar *name)
 133 {
 134     g_return_val_if_fail (seat != NULL, NULL);
 135     return g_hash_table_lookup (seat->priv->properties, name);
 136 }
 137
 138 gchar **
 139 seat_get_string_list_property (Seat *seat, const gchar *name)
 140 {
 141     g_return_val_if_fail (seat != NULL, NULL);
 142     return g_strsplit (g_hash_table_lookup (seat->priv->properties, name), ";", 0);
 143 }
 144
 145 gboolean
 146 seat_get_boolean_property (Seat *seat, const gchar *name)
 147 {
 148     return g_strcmp0 (seat_get_string_property (seat, name), "true") == 0;
 149 }
 150
 151 gint
 152 seat_get_integer_property (Seat *seat, const gchar *name)
 153 {
 154     const gchar *value;
 155
 156     value = seat_get_string_property (seat, name);
 157     return value ? atoi (value) : 0;
 158 }
 159
 160 const gchar *
 161 seat_get_name (Seat *seat)
 162 {
 163     const gchar *name;
 164
 165     name = seat_get_string_property (seat, "xdg-seat");
 166     if (name)
 167         return name;
 168
 169     return "seat0";
 170 }
 171
 172 void
 173 seat_set_can_switch (Seat *seat, gboolean can_switch)
 174 {
 175     g_return_if_fail (seat != NULL);
 176
 177     seat->priv->can_switch = can_switch;
 178 }
 179
 180 void
 181 seat_set_share_display_server (Seat *seat, gboolean share_display_server)
 182 {
 183     g_return_if_fail (seat != NULL);
 184
 185     seat->priv->share_display_server = share_display_server;
 186 }
 187
 188 gboolean
 189 seat_start (Seat *seat)
 190 {
 191     g_return_val_if_fail (seat != NULL, FALSE);
 192
 193     SEAT_GET_CLASS (seat)->setup (seat);
 194     return SEAT_GET_CLASS (seat)->start (seat);
 195 }
 196
 197 GList *
 198 seat_get_sessions (Seat *seat)
 199 {
 200     g_return_val_if_fail (seat != NULL, NULL);
 201     return seat->priv->sessions;
 202 }
 203
 204 void
 205 seat_set_active_session (Seat *seat, Session *session)
 206 {
 207     GList *link;
 208
 209     g_return_if_fail (seat != NULL);
 210
 211     SEAT_GET_CLASS (seat)->set_active_session (seat, session);
 212
 213     /* Stop any greeters */
 214     for (link = seat->priv->sessions; link; link = link->next)
 215     {
 216         Session *s = link->data;
 217
 218         if (s == session || session_get_is_stopping (s))
 219             continue;
 220
 221         if (IS_GREETER (s))
 222         {
 223             l_debug (seat, "Stopping greeter");
 224             session_stop (s);
 225         }
 226     }
 227
 228     /* Lock previous sessions */
 229     if (seat->priv->active_session)
 230     {
 231         if (session != seat->priv->active_session && !IS_GREETER (seat->priv->active_session))
 232             session_lock (seat->priv->active_session);
 233         g_object_unref (seat->priv->active_session);
 234     }
 235     seat->priv->active_session = g_object_ref (session);
 236 }
 237
 238 Session *
 239 seat_get_active_session (Seat *seat)
 240 {
 241     g_return_val_if_fail (seat != NULL, NULL);
 242     return SEAT_GET_CLASS (seat)->get_active_session (seat);
 243 }
 244
 245 Session *
 246 seat_get_next_session (Seat *seat)
 247 {
 248     g_return_val_if_fail (seat != NULL, NULL);
 249     return seat->priv->next_session;
 250 }
 251
 252 gboolean
 253 seat_get_can_switch (Seat *seat)
 254 {
 255     g_return_val_if_fail (seat != NULL, FALSE);
 256     return seat->priv->can_switch;
 257 }
 258
 259 gboolean
 260 seat_get_allow_guest (Seat *seat)
 261 {
 262     g_return_val_if_fail (seat != NULL, FALSE);
 263     return seat_get_boolean_property (seat, "allow-guest") && guest_account_is_installed ();
 264 }
 265
 266 static gboolean
 267 run_script (Seat *seat, DisplayServer *display_server, const gchar *script_name, User *user)
 268 {
 269     Process *script;
 270     gboolean result = FALSE;
 271
 272     script = process_new (NULL, NULL);
 273
 274     process_set_command (script, script_name);
 275
 276     /* Set POSIX variables */
 277     process_set_clear_environment (script, TRUE);
 278     process_set_env (script, "SHELL", "/bin/sh");
 279
 280     /* Variables required for regression tests */
 281     if (g_getenv ("LIGHTDM_TEST_ROOT"))
 282     {
 283         process_set_env (script, "LIGHTDM_TEST_ROOT", g_getenv ("LIGHTDM_TEST_ROOT"));
 284         process_set_env (script, "LD_PRELOAD", g_getenv ("LD_PRELOAD"));
 285         process_set_env (script, "LD_LIBRARY_PATH", g_getenv ("LD_LIBRARY_PATH"));
 286         process_set_env (script, "PATH", g_getenv ("PATH"));
 287     }
 288     else
 289         process_set_env (script, "PATH", "/usr/local/bin:/usr/bin:/bin");
 290
 291     if (user)
 292     {
 293         process_set_env (script, "USER", user_get_name (user));
 294         process_set_env (script, "LOGNAME", user_get_name (user));
 295         process_set_env (script, "HOME", user_get_home_directory (user));
 296     }
 297     else
 298         process_set_env (script, "HOME", "/");
 299
 300     SEAT_GET_CLASS (seat)->run_script (seat, display_server, script);
 301
 302     if (process_start (script, TRUE))
 303     {
 304         int exit_status;
 305
 306         exit_status = process_get_exit_status (script);
 307         if (WIFEXITED (exit_status))
 308         {
 309             l_debug (seat, "Exit status of %s: %d", script_name, WEXITSTATUS (exit_status));
 310             result = WEXITSTATUS (exit_status) == EXIT_SUCCESS;
 311         }
 312     }
 313
 314     g_object_unref (script);
 315
 316     return result;
 317 }
 318
 319 static void
 320 seat_real_run_script (Seat *seat, DisplayServer *display_server, Process *process)
 321 {
 322 }
 323
 324 static void
 325 emit_upstart_signal (const gchar *signal)
 326 {
 327     g_return_if_fail (signal != NULL);
 328     g_return_if_fail (signal[0] != 0);
 329
 330     if (getuid () != 0)
 331         return;
 332
 333     gchar *cmd = g_strdup_printf ("initctl -q emit %s DISPLAY_MANAGER=lightdm", signal);
 334     g_spawn_command_line_async (cmd, NULL); /* OK if it fails, probably not installed */
 335     g_free (cmd);
 336 }
 337
 338 static void
 339 check_stopped (Seat *seat)
 340 {
 341     if (seat->priv->stopping &&
 342         !seat->priv->stopped &&
 343         g_list_length (seat->priv->display_servers) == 0 &&
 344         g_list_length (seat->priv->sessions) == 0)
 345     {
 346         seat->priv->stopped = TRUE;
 347         l_debug (seat, "Stopped");
 348         g_signal_emit (seat, signals[STOPPED], 0);
 349     }
 350 }
 351
 352 static gboolean
 353 get_start_local_sessions (Seat *seat)
 354 {
 355     return SEAT_GET_CLASS (seat)->get_start_local_sessions (seat);
 356 }
 357
 358 static void
 359 display_server_stopped_cb (DisplayServer *display_server, Seat *seat)
 360 {
 361     const gchar *script;
 362     GList *list, *link;
 363     Session *active_session;
 364
 365     l_debug (seat, "Display server stopped");
 366
 367     /* Run a script right after stopping the display server */
 368     script = seat_get_string_property (seat, "display-stopped-script");
 369     if (script)
 370         run_script (seat, NULL, script, NULL);
 371
 372     g_signal_handlers_disconnect_matched (display_server, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, seat);
 373     seat->priv->display_servers = g_list_remove (seat->priv->display_servers, display_server);
 374
 375     if (seat->priv->stopping || !seat->priv->started)
 376     {
 377         check_stopped (seat);
 378         g_object_unref (display_server);
 379         return;
 380     }
 381
 382     /* Stop all sessions on this display server */
 383     list = g_list_copy (seat->priv->sessions);
 384     for (link = list; link; link = link->next)
 385         g_object_ref (link->data);
 386     for (link = list; link; link = link->next)
 387     {
 388         Session *session = link->data;
 389
 390         if (session_get_display_server (session) != display_server || session_get_is_stopping (session))
 391             continue;
 392
 393         /* Stop seat if this is the only display server and it failed to start a greeter */
 394         if (IS_GREETER (session) &&
 395             !session_get_is_started (session) &&
 396             g_list_length (seat->priv->display_servers) == 0)
 397         {
 398             l_debug (seat, "Stopping; greeter display server failed to start");
 399             seat_stop (seat);
 400         }
 401
 402         l_debug (seat, "Stopping session");
 403         session_stop (session);
 404     }
 405     g_list_free_full (list, g_object_unref);
 406
 407     if (!seat->priv->stopping && get_start_local_sessions (seat))
 408     {
 409         /* If we were the active session, switch to a greeter */
 410         active_session = seat_get_active_session (seat);
 411         if (!active_session || session_get_display_server (active_session) == display_server)
 412         {
 413             l_debug (seat, "Active display server stopped, starting greeter");
 414             if (!seat_switch_to_greeter (seat))
 415             {
 416                 l_debug (seat, "Stopping; failed to start a greeter");
 417                 seat_stop (seat);
 418             }
 419         }
 420     }
 421
 422     g_object_unref (display_server);
 423 }
 424
 425 static gboolean
 426 can_share_display_server (Seat *seat, DisplayServer *display_server)
 427 {
 428     return seat->priv->share_display_server && display_server_get_can_share (display_server);
 429 }
 430
 431 static void
 432 switch_to_greeter_from_failed_session (Seat *seat, Session *session)
 433 {
 434     Greeter *greeter_session;
 435
 436     greeter_session = create_greeter_session (seat);
 437     if (session_get_is_guest (session))
 438         greeter_set_hint (greeter_session, "select-guest", "true");
 439     else
 440         greeter_set_hint (greeter_session, "select-user", session_get_username (session));
 441     if (seat->priv->session_to_activate)
 442         g_object_unref (seat->priv->session_to_activate);
 443     seat->priv->session_to_activate = g_object_ref (greeter_session);
 444
 445     if (can_share_display_server (seat, session_get_display_server (session)))
 446         session_set_display_server (SESSION (greeter_session), session_get_display_server (session));
 447     else
 448     {
 449         DisplayServer *display_server;
 450
 451         display_server = create_display_server (seat, session_get_session_type (session));
 452         session_set_display_server (session, display_server);
 453         if (!display_server_start (display_server))
 454         {
 455             l_debug (seat, "Failed to start display server for greeter");
 456             seat_stop (seat);
 457         }
 458     }
 459
 460     start_session (seat, SESSION (greeter_session));
 461
 462     /* Stop failed session */
 463     session_stop (session);
 464 }
 465
 466 static void
 467 start_session (Seat *seat, Session *session)
 468 {
 469     /* Use system location for greeter log file */
 470     if (IS_GREETER (session))
 471     {
 472         gchar *log_dir, *filename, *log_filename;
 473
 474         log_dir = config_get_string (config_get_instance (), "LightDM", "log-directory");
 475         filename = g_strdup_printf ("%s-greeter.log", display_server_get_name (session_get_display_server (session)));
 476         log_filename = g_build_filename (log_dir, filename, NULL);
 477         g_free (log_dir);
 478         g_free (filename);
 479         session_set_log_file (session, log_filename);
 480         g_free (log_filename);
 481     }
 482
 483     if (session_start (session))
 484         return;
 485
 486     if (IS_GREETER (session))
 487     {
 488         l_debug (seat, "Failed to start greeter");
 489         display_server_stop (session_get_display_server (session));
 490         return;
 491     }
 492
 493     l_debug (seat, "Failed to start session, starting greeter");
 494     switch_to_greeter_from_failed_session (seat, session);
 495 }
 496
 497 static void
 498 run_session (Seat *seat, Session *session)
 499 {
 500     const gchar *script;
 501
 502     if (IS_GREETER (session))
 503         script = seat_get_string_property (seat, "greeter-setup-script");
 504     else
 505         script = seat_get_string_property (seat, "session-setup-script");
 506     if (script && !run_script (seat, session_get_display_server (session), script, session_get_user (session)))
 507     {
 508         l_debug (seat, "Switching to greeter due to failed setup script");
 509         switch_to_greeter_from_failed_session (seat, session);
 510         return;
 511     }
 512
 513     if (!IS_GREETER (session))
 514     {
 515         g_signal_emit (seat, signals[RUNNING_USER_SESSION], 0, session);
 516         emit_upstart_signal ("desktop-session-start");
 517     }
 518
 519     session_run (session);
 520
 521     // FIXME: Wait until the session is ready
 522
 523     if (session == seat->priv->session_to_activate)
 524     {
 525         seat_set_active_session (seat, session);
 526         g_object_unref (seat->priv->session_to_activate);
 527         seat->priv->session_to_activate = NULL;
 528     }
 529 }
 530
 531 static Session *
 532 find_user_session (Seat *seat, const gchar *username, Session *ignore_session)
 533 {
 534     GList *link;
 535
 536     if (!username)
 537         return NULL;
 538
 539     for (link = seat->priv->sessions; link; link = link->next)
 540     {
 541         Session *session = link->data;
 542
 543         if (session == ignore_session)
 544             continue;
 545
 546         if (!session_get_is_stopping (session) && g_strcmp0 (session_get_username (session), username) == 0)
 547             return session;
 548     }
 549
 550     return NULL;
 551 }
 552
 553 static void
 554 greeter_active_username_changed_cb (Greeter *greeter, GParamSpec *pspec, Seat *seat)
 555 {
 556     Session *session;
 557
 558     session = find_user_session (seat, greeter_get_active_username (greeter), seat->priv->active_session);
 559
 560     if (seat->priv->next_session)
 561         g_object_unref (seat->priv->next_session);
 562     seat->priv->next_session = session ? g_object_ref (session) : NULL;
 563
 564     SEAT_GET_CLASS (seat)->set_next_session (seat, session);
 565 }
 566
 567 static void
 568 session_authentication_complete_cb (Session *session, Seat *seat)
 569 {
 570     if (session_get_is_authenticated (session))
 571     {
 572         Session *s;
 573
 574         s = find_user_session (seat, session_get_username (session), session);
 575         if (s)
 576         {
 577             l_debug (seat, "Session authenticated, switching to existing user session");
 578             seat_set_active_session (seat, s);
 579             session_stop (session);
 580         }
 581         else
 582         {
 583             l_debug (seat, "Session authenticated, running command");
 584             run_session (seat, session);
 585         }
 586     }
 587     else if (!IS_GREETER (session))
 588     {
 589         l_debug (seat, "Switching to greeter due to failed authentication");
 590         switch_to_greeter_from_failed_session (seat, session);
 591     }
 592     else
 593     {
 594         l_debug (seat, "Stopping session that failed authentication");
 595         session_stop (session);
 596     }
 597 }
 598
 599 static void
 600 session_stopped_cb (Session *session, Seat *seat)
 601 {
 602     DisplayServer *display_server;
 603
 604     l_debug (seat, "Session stopped");
 605
 606     g_signal_handlers_disconnect_matched (session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, seat);
 607     seat->priv->sessions = g_list_remove (seat->priv->sessions, session);
 608     if (session == seat->priv->active_session)
 609     {
 610         g_object_unref (seat->priv->active_session);
 611         seat->priv->active_session = NULL;
 612     }
 613     if (session == seat->priv->next_session)
 614     {
 615         g_object_unref (seat->priv->next_session);
 616         seat->priv->next_session = NULL;
 617     }
 618     if (session == seat->priv->session_to_activate)
 619     {
 620         g_object_unref (seat->priv->session_to_activate);
 621         seat->priv->session_to_activate = NULL;
 622     }
 623
 624     display_server = session_get_display_server (session);
 625     if (!display_server)
 626     {
 627         g_object_unref (session);
 628         return;
 629     }
 630
 631     /* Cleanup */
 632     if (!IS_GREETER (session))
 633     {
 634         const gchar *script;
 635         script = seat_get_string_property (seat, "session-cleanup-script");
 636         if (script)
 637             run_script (seat, display_server, script, session_get_user (session));
 638     }
 639
 640     /* We were waiting for this session, but it didn't start :( */
 641     // FIXME: Start a greeter on this?
 642     if (session == seat->priv->session_to_activate)
 643     {
 644         g_object_unref (seat->priv->session_to_activate);
 645         seat->priv->session_to_activate = NULL;
 646     }
 647
 648     if (seat->priv->stopping)
 649     {
 650         check_stopped (seat);
 651         g_object_unref (session);
 652         return;
 653     }
 654
 655     /* If this is the greeter session then re-use this display server */
 656     if (IS_GREETER (session) &&
 657         can_share_display_server (seat, display_server) &&
 658         greeter_get_start_session (GREETER (session)))
 659     {
 660         GList *link;
 661
 662         for (link = seat->priv->sessions; link; link = link->next)
 663         {
 664             Session *s = link->data;
 665
 666             /* Skip this session and sessions on other display servers */
 667             if (s == session || session_get_display_server (s) != display_server || session_get_is_stopping (s))
 668                 continue;
 669
 670             if (session_get_is_authenticated (s))
 671             {
 672                 l_debug (seat, "Greeter stopped, running session");
 673                 run_session (seat, s);
 674             }
 675             else
 676             {
 677                 l_debug (seat, "Greeter stopped, starting session authentication");
 678                 start_session (seat, s);
 679             }
 680             break;
 681         }
 682     }
 683     /* If this is the greeter and nothing else is running then stop the seat */
 684     else if (IS_GREETER (session) &&
 685         !greeter_get_start_session (GREETER (session)) &&
 686         g_list_length (seat->priv->display_servers) == 1 &&
 687         g_list_nth_data (seat->priv->display_servers, 0) == display_server)
 688     {
 689         l_debug (seat, "Stopping; failed to start a greeter");
 690         seat_stop (seat);
 691     }
 692     /* If we were the active session, switch to a greeter */
 693     else if (!IS_GREETER (session) && session == seat_get_active_session (seat))
 694     {
 695         l_debug (seat, "Active session stopped, starting greeter");
 696         if (!seat_switch_to_greeter (seat))
 697         {
 698             l_debug (seat, "Stopping; failed to start a greeter");
 699             seat_stop (seat);
 700         }
 701     }
 702
 703     /* Stop the display server if no-longer required */
 704     if (display_server && !display_server_get_is_stopping (display_server))
 705     {
 706         GList *link;
 707         int n_sessions = 0;
 708
 709         for (link = seat->priv->sessions; link; link = link->next)
 710         {
 711             Session *s = link->data;
 712             if (s == session)
 713                 continue;
 714             if (session_get_display_server (s) == display_server)
 715                 n_sessions++;
 716         }
 717         if (n_sessions == 0)
 718         {
 719             l_debug (seat, "Stopping display server, no sessions require it");
 720             display_server_stop (display_server);
 721         }
 722     }
 723
 724     g_signal_emit (seat, signals[SESSION_REMOVED], 0, session);
 725     g_object_unref (session);
 726 }
 727
 728 static void
 729 set_session_env (Session *session)
 730 {
 731     /* Connect using the session bus */
 732     if (getuid () != 0)
 733     {
 734         if (g_getenv ("DBUS_SESSION_BUS_ADDRESS"))
 735             session_set_env (session, "DBUS_SESSION_BUS_ADDRESS", g_getenv ("DBUS_SESSION_BUS_ADDRESS"));
 736         session_set_env (session, "LDM_BUS", "SESSION");
 737         if (g_getenv ("LD_PRELOAD"))
 738             session_set_env (session, "LD_PRELOAD", g_getenv ("LD_PRELOAD"));
 739         if (g_getenv ("LD_LIBRARY_PATH"))
 740             session_set_env (session, "LD_LIBRARY_PATH", g_getenv ("LD_LIBRARY_PATH"));
 741         if (g_getenv ("PATH"))
 742             session_set_env (session, "PATH", g_getenv ("PATH"));
 743     }
 744
 745     /* Variables required for regression tests */
 746     if (g_getenv ("LIGHTDM_TEST_ROOT"))
 747     {
 748         session_set_env (session, "LIGHTDM_TEST_ROOT", g_getenv ("LIGHTDM_TEST_ROOT"));
 749         session_set_env (session, "DBUS_SYSTEM_BUS_ADDRESS", g_getenv ("DBUS_SYSTEM_BUS_ADDRESS"));
 750         session_set_env (session, "DBUS_SESSION_BUS_ADDRESS", g_getenv ("DBUS_SESSION_BUS_ADDRESS"));
 751         session_set_env (session, "LD_PRELOAD", g_getenv ("LD_PRELOAD"));
 752         session_set_env (session, "LD_LIBRARY_PATH", g_getenv ("LD_LIBRARY_PATH"));
 753         session_set_env (session, "GI_TYPELIB_PATH", g_getenv ("GI_TYPELIB_PATH"));
 754     }
 755 }
 756
 757 static Session *
 758 create_session (Seat *seat, gboolean autostart)
 759 {
 760     Session *session;
 761
 762     session = SEAT_GET_CLASS (seat)->create_session (seat);
 763     seat->priv->sessions = g_list_append (seat->priv->sessions, session);
 764     if (autostart)
 765         g_signal_connect (session, "authentication-complete", G_CALLBACK (session_authentication_complete_cb), seat);
 766     g_signal_connect (session, "stopped", G_CALLBACK (session_stopped_cb), seat);
 767
 768     set_session_env (session);
 769
 770     g_signal_emit (seat, signals[SESSION_ADDED], 0, session);
 771
 772     return session;
 773 }
 774
 775 static gchar **
 776 get_session_argv (Seat *seat, SessionConfig *session_config, const gchar *session_wrapper)
 777 {
 778     gboolean result;
 779     int argc;
 780     gchar **argv, *path;
 781     GError *error = NULL;
 782
 783     /* If configured, run sessions through a wrapper */
 784     if (session_wrapper)
 785     {
 786         argv = g_malloc (sizeof (gchar *) * 3);
 787         path = g_find_program_in_path (session_wrapper);
 788         argv[0] = path ? path : g_strdup (session_wrapper);
 789         argv[1] = g_strdup (session_config_get_command (session_config));
 790         argv[2] = NULL;
 791         return argv;
 792     }
 793
 794     /* Split command into an array listing and make command absolute */
 795     result = g_shell_parse_argv (session_config_get_command (session_config), &argc, &argv, &error);
 796     if (error)
 797         l_debug (seat, "Invalid session command '%s': %s", session_config_get_command (session_config), error->message);
 798     g_clear_error (&error);
 799     if (!result)
 800         return NULL;
 801     path = g_find_program_in_path (argv[0]);
 802     if (path)
 803     {
 804         g_free (argv[0]);
 805         argv[0] = path;
 806     }
 807
 808     return argv;
 809 }
 810
 811 static SessionConfig *
 812 find_session_config (Seat *seat, const gchar *sessions_dir, const gchar *session_name)
 813 {
 814     gchar **dirs;
 815     SessionConfig *session_config = NULL;
 816     int i;
 817     GError *error = NULL;
 818
 819     g_return_val_if_fail (sessions_dir != NULL, NULL);
 820     g_return_val_if_fail (session_name != NULL, NULL);
 821
 822     dirs = g_strsplit (sessions_dir, ":", -1);
 823     for (i = 0; dirs[i]; i++)
 824     {
 825         gchar *filename, *path;
 826
 827         filename = g_strdup_printf ("%s.desktop", session_name);
 828         path = g_build_filename (dirs[i], filename, NULL);
 829         g_free (filename);
 830         session_config = session_config_new_from_file (path, &error);
 831         g_free (path);
 832         if (session_config)
 833             break;
 834
 835         if (dirs[i+1] == NULL)
 836             l_debug (seat, "Failed to find session configuration %s", session_name);
 837         g_clear_error (&error);
 838     }
 839     g_strfreev (dirs);
 840
 841     return session_config;
 842 }
 843
 844 static void
 845 configure_session (Session *session, SessionConfig *config, const gchar *session_name, const gchar *language)
 846 {
 847     const gchar *desktop_name;
 848
 849     session_set_session_type (session, session_config_get_session_type (config));
 850     session_set_env (session, "DESKTOP_SESSION", session_name);
 851     session_set_env (session, "GDMSESSION", session_name);
 852     desktop_name = session_config_get_desktop_name (config);
 853     if (desktop_name)
 854         session_set_env (session, "XDG_CURRENT_DESKTOP", desktop_name);
 855     if (language && language[0] != '\0')
 856     {
 857         session_set_env (session, "LANG", language);
 858         session_set_env (session, "GDM_LANG", language);
 859     }
 860 }
 861
 862 static Session *
 863 create_user_session (Seat *seat, const gchar *username, gboolean autostart)
 864 {
 865     User *user;
 866     gchar *sessions_dir;
 867     const gchar *session_name, *language;
 868     SessionConfig *session_config;
 869     Session *session = NULL;
 870
 871     l_debug (seat, "Creating user session");
 872
 873     /* Load user preferences */
 874     user = accounts_get_user_by_name (username);
 875     if (!user)
 876     {
 877         l_debug (seat, "Can't login unknown user '%s'", username);
 878         return NULL;
 879     }
 880     session_name = user_get_xsession (user);
 881     language = user_get_language (user);
 882
 883     if (!session_name)
 884         session_name = seat_get_string_property (seat, "user-session");
 885     sessions_dir = config_get_string (config_get_instance (), "LightDM", "sessions-directory");
 886     session_config = find_session_config (seat, sessions_dir, session_name);
 887     g_free (sessions_dir);
 888     if (session_config)
 889     {
 890         gchar **argv;
 891
 892         session = create_session (seat, autostart);
 893         configure_session (session, session_config, session_name, language);
 894         session_set_username (session, username);
 895         session_set_do_authenticate (session, TRUE);
 896         argv = get_session_argv (seat, session_config, seat_get_string_property (seat, "session-wrapper"));
 897         session_set_argv (session, argv);
 898         g_strfreev (argv);
 899         g_object_unref (session_config);
 900     }
 901     else
 902         l_debug (seat, "Can't find session '%s'", seat_get_string_property (seat, "user-session"));
 903
 904     g_object_unref (user);
 905
 906     return session;
 907 }
 908
 909 static void
 910 prepend_argv (gchar ***argv, const gchar *value)
 911 {
 912     gchar **old_argv, **new_argv;
 913     gint i;
 914
 915     old_argv = *argv;
 916     new_argv = g_malloc (sizeof (gchar *) * (g_strv_length (*argv) + 2));
 917     new_argv[0] = g_strdup (value);
 918     for (i = 0; old_argv[i]; i++)
 919         new_argv[i + 1] = old_argv[i];
 920     new_argv[i + 1] = NULL;
 921
 922     g_free (*argv);
 923     *argv = new_argv;
 924 }
 925
 926 static Session *
 927 create_guest_session (Seat *seat, const gchar *session_name)
 928 {
 929     const gchar *guest_wrapper;
 930     gchar *sessions_dir, **argv;
 931     SessionConfig *session_config;
 932     Session *session;
 933
 934     if (!session_name)
 935         session_name = seat_get_string_property (seat, "user-session");
 936     sessions_dir = config_get_string (config_get_instance (), "LightDM", "sessions-directory");
 937     session_config = find_session_config (seat, sessions_dir, session_name);
 938     g_free (sessions_dir);
 939     if (!session_config)
 940     {
 941         l_debug (seat, "Can't find session '%s'", seat_get_string_property (seat, "user-session"));
 942         return NULL;
 943     }
 944
 945     session = create_session (seat, TRUE);
 946     configure_session (session, session_config, session_name, NULL);
 947     session_set_do_authenticate (session, TRUE);
 948     session_set_is_guest (session, TRUE);
 949     argv = get_session_argv (seat, session_config, seat_get_string_property (seat, "session-wrapper"));
 950     guest_wrapper = seat_get_string_property (seat, "guest-wrapper");
 951     if (guest_wrapper)
 952     {
 953         gchar *path;
 954         path = g_find_program_in_path (guest_wrapper);
 955         prepend_argv (&argv, path ? path : guest_wrapper);
 956         g_free (path);
 957     }
 958
 959     session_set_argv (session, argv);
 960     g_strfreev (argv);
 961     g_object_unref (session_config);
 962
 963     return session;
 964 }
 965
 966 static Session *
 967 greeter_create_session_cb (Greeter *greeter, Seat *seat)
 968 {
 969     Session *session;
 970
 971     session = create_session (seat, FALSE);
 972     session_set_session_type (session, session_get_session_type (SESSION (greeter)));
 973     session_set_display_server (session, session_get_display_server (SESSION (greeter)));
 974
 975     return g_object_ref (session);
 976 }
 977
 978 static gboolean
 979 greeter_start_session_cb (Greeter *greeter, SessionType type, const gchar *session_name, Seat *seat)
 980 {
 981     Session *session, *existing_session;
 982     const gchar *username;
 983     DisplayServer *display_server;
 984
 985     /* Get the session to use */
 986     if (greeter_get_guest_authenticated (greeter))
 987     {
 988         session = create_guest_session (seat, session_name);
 989         if (!session)
 990             return FALSE;
 991         session_set_pam_service (session, AUTOLOGIN_SERVICE);
 992     }
 993     else
 994     {
 995         const gchar *language = NULL;
 996         SessionConfig *session_config;
 997         User *user;
 998         gchar *sessions_dir = NULL;
 999         gchar **argv;
1000
1001         session = greeter_get_authentication_session (greeter);
1002
1003         /* Get session command to run */
1004         switch (type)
1005         {
1006         case SESSION_TYPE_LOCAL:
1007             sessions_dir = config_get_string (config_get_instance (), "LightDM", "sessions-directory");
1008             break;
1009         case SESSION_TYPE_REMOTE:
1010             sessions_dir = config_get_string (config_get_instance (), "LightDM", "remote-sessions-directory");
1011             break;
1012         }
1013
1014         /* Load user preferences */
1015         user = session_get_user (session);
1016         if (user)
1017         {
1018             if (!session_name)
1019                 session_name = user_get_xsession (user);
1020             language = user_get_language (user);
1021         }
1022
1023         if (!session_name)
1024             session_name = seat_get_string_property (seat, "user-session");
1025         if (user)
1026             user_set_xsession (session_get_user (session), session_name);
1027
1028         session_config = find_session_config (seat, sessions_dir, session_name);
1029         g_free (sessions_dir);
1030         if (!session_config)
1031         {
1032             l_debug (seat, "Can't find session '%s'", seat_get_string_property (seat, "user-session"));
1033             return FALSE;
1034         }
1035
1036         configure_session (session, session_config, session_name, language);
1037         argv = get_session_argv (seat, session_config, seat_get_string_property (seat, "session-wrapper"));
1038         session_set_argv (session, argv);
1039         g_strfreev (argv);
1040         g_object_unref (session_config);
1041     }
1042
1043     /* Switch to this session when it is ready */
1044     if (seat->priv->session_to_activate)
1045         g_object_unref (seat->priv->session_to_activate);
1046     seat->priv->session_to_activate = g_object_ref (session);
1047
1048     /* Return to existing session if it is open */
1049     username = session_get_username (session);
1050     existing_session = find_user_session (seat, username, NULL);
1051     if (existing_session && session != existing_session)
1052     {
1053         l_debug (seat, "Returning to existing user session %s", username);
1054         session_stop (session);
1055         session_unlock (existing_session);
1056         seat_set_active_session (seat, existing_session);
1057         return TRUE;
1058     }
1059
1060     /* If can re-use the display server, stop the greeter first */
1061     display_server = session_get_display_server (SESSION (greeter));
1062     if (can_share_display_server (seat, display_server) &&
1063         strcmp (display_server_get_session_type (display_server), session_get_session_type (session)) == 0)
1064     {
1065         l_debug (seat, "Stopping greeter; display server will be re-used for user session");
1066
1067         /* Run on the same display server after the greeter has stopped */
1068         session_set_display_server (session, display_server);
1069
1070         /* Stop the greeter */
1071         session_stop (SESSION (greeter));
1072
1073         return TRUE;
1074     }
1075     /* Otherwise start a new display server for this session */
1076     else
1077     {
1078         display_server = create_display_server (seat, session_get_session_type (session));
1079         session_set_display_server (session, display_server);
1080         if (!display_server_start (display_server))
1081         {
1082             l_debug (seat, "Failed to start display server for new session");
1083             return FALSE;
1084         }
1085
1086         return TRUE;
1087     }
1088 }
1089
1090 static Greeter *
1091 create_greeter_session (Seat *seat)
1092 {
1093     gchar *sessions_dir, **argv;
1094     SessionConfig *session_config;
1095     Greeter *greeter_session;
1096     const gchar *greeter_wrapper;
1097
1098     l_debug (seat, "Creating greeter session");
1099
1100     sessions_dir = config_get_string (config_get_instance (), "LightDM", "greeters-directory");
1101     session_config = find_session_config (seat, sessions_dir, seat_get_string_property (seat, "greeter-session"));
1102     g_free (sessions_dir);
1103     if (!session_config)
1104         return NULL;
1105
1106     argv = get_session_argv (seat, session_config, NULL);
1107     greeter_wrapper = seat_get_string_property (seat, "greeter-wrapper");
1108     if (greeter_wrapper)
1109     {
1110         gchar *path;
1111         path = g_find_program_in_path (greeter_wrapper);
1112         prepend_argv (&argv, path ? path : greeter_wrapper);
1113         g_free (path);
1114     }
1115
1116     greeter_session = SEAT_GET_CLASS (seat)->create_greeter_session (seat);
1117     session_set_session_type (SESSION (greeter_session), session_config_get_session_type (session_config));
1118     seat->priv->sessions = g_list_append (seat->priv->sessions, SESSION (greeter_session));
1119     g_signal_connect (greeter_session, "notify::active-username", G_CALLBACK (greeter_active_username_changed_cb), seat);
1120     g_signal_connect (greeter_session, "authentication-complete", G_CALLBACK (session_authentication_complete_cb), seat);
1121     g_signal_connect (greeter_session, "stopped", G_CALLBACK (session_stopped_cb), seat);
1122
1123     set_session_env (SESSION (greeter_session));
1124     session_set_env (SESSION (greeter_session), "XDG_SESSION_CLASS", "greeter");
1125
1126     session_set_pam_service (SESSION (greeter_session), GREETER_SERVICE);
1127     if (getuid () == 0)
1128     {
1129         gchar *greeter_user;
1130         greeter_user = config_get_string (config_get_instance (), "LightDM", "greeter-user");
1131         session_set_username (SESSION (greeter_session), greeter_user);
1132         g_free (greeter_user);
1133     }
1134     else
1135     {
1136         /* In test mode run the greeter as ourself */
1137         session_set_username (SESSION (greeter_session), user_get_name (accounts_get_current_user ()));
1138     }
1139     session_set_argv (SESSION (greeter_session), argv);
1140     g_strfreev (argv);
1141
1142     greeter_set_pam_services (greeter_session, USER_SERVICE, AUTOLOGIN_SERVICE);
1143     g_signal_connect (greeter_session, "create-session", G_CALLBACK (greeter_create_session_cb), seat);
1144     g_signal_connect (greeter_session, "start-session", G_CALLBACK (greeter_start_session_cb), seat);
1145
1146     /* Set hints to greeter */
1147     greeter_set_hint (greeter_session, "default-session", seat_get_string_property (seat, "user-session"));
1148     greeter_set_allow_guest (greeter_session, seat_get_allow_guest (seat));
1149     greeter_set_hint (greeter_session, "hide-users", seat_get_boolean_property (seat, "greeter-hide-users") ? "true" : "false");
1150     greeter_set_hint (greeter_session, "show-manual-login", seat_get_boolean_property (seat, "greeter-show-manual-login") ? "true" : "false");
1151     greeter_set_hint (greeter_session, "show-remote-login", seat_get_boolean_property (seat, "greeter-show-remote-login") ? "true" : "false");
1152     greeter_set_hint (greeter_session, "has-guest-account", seat_get_allow_guest (seat) && seat_get_boolean_property (seat, "greeter-allow-guest") ? "true" : "false");
1153
1154     g_object_unref (session_config);
1155
1156     return greeter_session;
1157 }
1158
1159 static Session *
1160 find_session_for_display_server (Seat *seat, DisplayServer *display_server)
1161 {
1162     GList *link;
1163
1164     for (link = seat->priv->sessions; link; link = link->next)
1165     {
1166         Session *session = link->data;
1167         if (session_get_display_server (session) == display_server && !session_get_is_stopping (session))
1168             return session;
1169     }
1170
1171     return NULL;
1172 }
1173
1174 static void
1175 display_server_ready_cb (DisplayServer *display_server, Seat *seat)
1176 {
1177     const gchar *script;
1178     Session *session;
1179
1180     /* Run setup script */
1181     script = seat_get_string_property (seat, "display-setup-script");
1182     if (script && !run_script (seat, display_server, script, NULL))
1183     {
1184         l_debug (seat, "Stopping display server due to failed setup script");
1185         display_server_stop (display_server);
1186         return;
1187     }
1188
1189     /* Stop if don't need to run a session */
1190     if (!get_start_local_sessions (seat))
1191         return;
1192
1193     emit_upstart_signal ("login-session-start");
1194
1195     /* Start the session waiting for this display server */
1196     session = find_session_for_display_server (seat, display_server);
1197     if (session)
1198     {
1199         if (session_get_is_authenticated (session))
1200         {
1201             l_debug (seat, "Display server ready, running session");
1202             run_session (seat, session);
1203         }
1204         else
1205         {
1206             l_debug (seat, "Display server ready, starting session authentication");
1207             start_session (seat, session);
1208         }
1209     }
1210     else
1211     {
1212         l_debug (seat, "Stopping not required display server");
1213         display_server_stop (display_server);
1214     }
1215 }
1216
1217 static DisplayServer *
1218 create_display_server (Seat *seat, const gchar *session_type)
1219 {
1220     DisplayServer *display_server;
1221
1222     l_debug (seat, "Creating display server of type %s", session_type);
1223
1224     display_server = SEAT_GET_CLASS (seat)->create_display_server (seat, session_type);
1225     if (!display_server)
1226         return NULL;
1227
1228     seat->priv->display_servers = g_list_append (seat->priv->display_servers, display_server);
1229     g_signal_connect (display_server, "ready", G_CALLBACK (display_server_ready_cb), seat);
1230     g_signal_connect (display_server, "stopped", G_CALLBACK (display_server_stopped_cb), seat);
1231
1232     return display_server;
1233 }
1234
1235 static Greeter *
1236 find_greeter_session (Seat *seat)
1237 {
1238     GList *link;
1239
1240     for (link = seat->priv->sessions; link; link = link->next)
1241     {
1242         Session *session = link->data;
1243         if (!session_get_is_stopping (session) && IS_GREETER (session))
1244             return GREETER (session);
1245     }
1246
1247     return NULL;
1248 }
1249
1250 gboolean
1251 seat_switch_to_greeter (Seat *seat)
1252 {
1253     Greeter *greeter_session;
1254     DisplayServer *display_server;
1255
1256     g_return_val_if_fail (seat != NULL, FALSE);
1257
1258     if (!seat->priv->can_switch)
1259         return FALSE;
1260
1261     /* Switch to greeter if one open (shouldn't be though) */
1262     greeter_session = find_greeter_session (seat);
1263     if (greeter_session)
1264     {
1265         l_debug (seat, "Switching to existing greeter");
1266         seat_set_active_session (seat, SESSION (greeter_session));
1267         return TRUE;
1268     }
1269
1270     greeter_session = create_greeter_session (seat);
1271     if (!greeter_session)
1272         return FALSE;
1273
1274     if (seat->priv->session_to_activate)
1275         g_object_unref (seat->priv->session_to_activate);
1276     seat->priv->session_to_activate = g_object_ref (greeter_session);
1277
1278     display_server = create_display_server (seat, session_get_session_type (SESSION (greeter_session)));
1279     session_set_display_server (SESSION (greeter_session), display_server);
1280     if (!display_server_start (display_server))
1281         return FALSE;
1282
1283     return TRUE;
1284 }
1285
1286 static void
1287 switch_authentication_complete_cb (Session *session, Seat *seat)
1288 {
1289     Greeter *greeter_session;
1290     DisplayServer *display_server;
1291
1292     /* If authenticated, then unlock existing session or start new one */
1293     if (session_get_is_authenticated (session))
1294     {
1295         Session *s;
1296
1297         s = find_user_session (seat, session_get_username (session), session);
1298         if (s)
1299         {
1300             l_debug (seat, "Session authenticated, switching to existing user session");
1301             session_unlock (s);
1302             seat_set_active_session (seat, s);
1303             session_stop (session);
1304         }
1305         else
1306         {
1307             l_debug (seat, "Session authenticated, starting display server");
1308             if (seat->priv->session_to_activate)
1309                 g_object_unref (seat->priv->session_to_activate);
1310             seat->priv->session_to_activate = g_object_ref (session);
1311             display_server = create_display_server (seat, session_get_session_type (session));
1312             session_set_display_server (session, display_server);
1313             display_server_start (display_server);
1314         }
1315
1316         return;
1317     }
1318
1319     l_debug (seat, "Switching to greeter to authenticate session");
1320
1321     session_stop (session);
1322
1323     greeter_session = create_greeter_session (seat);
1324     if (session_get_is_guest (session))
1325         greeter_set_hint (greeter_session, "select-guest", "true");
1326     else
1327         greeter_set_hint (greeter_session, "select-user", session_get_username (session));
1328     if (seat->priv->session_to_activate)
1329         g_object_unref (seat->priv->session_to_activate);
1330     seat->priv->session_to_activate = g_object_ref (greeter_session);
1331
1332     display_server = create_display_server (seat, session_get_session_type (SESSION (greeter_session)));
1333     session_set_display_server (SESSION (greeter_session), display_server);
1334     display_server_start (display_server);
1335 }
1336
1337 gboolean
1338 seat_switch_to_user (Seat *seat, const gchar *username, const gchar *session_name)
1339 {
1340     Session *session;
1341
1342     g_return_val_if_fail (seat != NULL, FALSE);
1343     g_return_val_if_fail (username != NULL, FALSE);
1344
1345     if (!seat->priv->can_switch)
1346         return FALSE;
1347
1348     /* If we're already on this session, then ignore */
1349     session = find_user_session (seat, username, NULL);
1350     if (session && session == seat->priv->active_session)
1351         return TRUE;
1352
1353     l_debug (seat, "Switching to user %s", username);
1354
1355     /* Attempt to authenticate them */
1356     session = create_user_session (seat, username, FALSE);
1357     g_signal_connect (session, "authentication-complete", G_CALLBACK (switch_authentication_complete_cb), seat);
1358     session_set_pam_service (session, USER_SERVICE);
1359     session_start (session);
1360
1361     return FALSE;
1362 }
1363
1364 static Session *
1365 find_guest_session (Seat *seat)
1366 {
1367     GList *link;
1368
1369     for (link = seat->priv->sessions; link; link = link->next)
1370     {
1371         Session *session = link->data;
1372         if (!session_get_is_stopping (session) && session_get_is_guest (session))
1373             return session;
1374     }
1375
1376     return NULL;
1377 }
1378
1379 gboolean
1380 seat_switch_to_guest (Seat *seat, const gchar *session_name)
1381 {
1382     Session *session;
1383     DisplayServer *display_server;
1384
1385     g_return_val_if_fail (seat != NULL, FALSE);
1386
1387     if (!seat->priv->can_switch || !seat_get_allow_guest (seat))
1388         return FALSE;
1389
1390     /* Switch to session if one open */
1391     session = find_guest_session (seat);
1392     if (session)
1393     {
1394         l_debug (seat, "Switching to existing guest account %s", session_get_username (session));
1395         seat_set_active_session (seat, session);
1396         return TRUE;
1397     }
1398
1399     session = create_guest_session (seat, session_name);
1400     if (!session)
1401         return FALSE;
1402
1403     display_server = create_display_server (seat, session_get_session_type (session));
1404
1405     if (seat->priv->session_to_activate)
1406         g_object_unref (seat->priv->session_to_activate);
1407     seat->priv->session_to_activate = g_object_ref (session);
1408     session_set_pam_service (session, AUTOLOGIN_SERVICE);
1409     session_set_display_server (session, display_server);
1410
1411     return display_server_start (display_server);
1412 }
1413
1414 gboolean
1415 seat_lock (Seat *seat, const gchar *username)
1416 {
1417     Greeter *greeter_session;
1418     DisplayServer *display_server;
1419
1420     g_return_val_if_fail (seat != NULL, FALSE);
1421
1422     if (!seat->priv->can_switch)
1423         return FALSE;
1424
1425     l_debug (seat, "Locking");
1426
1427     /* Switch to greeter if one open (shouldn't be though) */
1428     greeter_session = find_greeter_session (seat);
1429     if (greeter_session)
1430     {
1431         l_debug (seat, "Switching to existing greeter");
1432         seat_set_active_session (seat, SESSION (greeter_session));
1433         return TRUE;
1434     }
1435
1436     greeter_session = create_greeter_session (seat);
1437     if (!greeter_session)
1438         return FALSE;
1439
1440     display_server = create_display_server (seat, session_get_session_type (SESSION (greeter_session)));
1441
1442     if (seat->priv->session_to_activate)
1443         g_object_unref (seat->priv->session_to_activate);
1444     seat->priv->session_to_activate = g_object_ref (greeter_session);
1445     greeter_set_hint (greeter_session, "lock-screen", "true");
1446     if (username)
1447         greeter_set_hint (greeter_session, "select-user", username);
1448     session_set_display_server (SESSION (greeter_session), display_server);
1449
1450     return display_server_start (display_server);
1451 }
1452
1453 void
1454 seat_stop (Seat *seat)
1455 {
1456     g_return_if_fail (seat != NULL);
1457
1458     if (seat->priv->stopping)
1459         return;
1460
1461     l_debug (seat, "Stopping");
1462     seat->priv->stopping = TRUE;
1463     SEAT_GET_CLASS (seat)->stop (seat);
1464 }
1465
1466 gboolean
1467 seat_get_is_stopping (Seat *seat)
1468 {
1469     g_return_val_if_fail (seat != NULL, FALSE);
1470     return seat->priv->stopping;
1471 }
1472
1473 static gboolean
1474 seat_real_get_start_local_sessions (Seat *seat)
1475 {
1476     return TRUE;
1477 }
1478
1479 static void
1480 seat_real_setup (Seat *seat)
1481 {
1482 }
1483
1484 static gboolean
1485 seat_real_start (Seat *seat)
1486 {
1487     const gchar *autologin_username;
1488     int autologin_timeout;
1489     gboolean autologin_guest;
1490     gboolean autologin_in_background;
1491     Session *session = NULL, *background_session = NULL;
1492
1493     l_debug (seat, "Starting");
1494
1495     /* If this display server doesn't have a session running on it, just start it */
1496     if (!get_start_local_sessions (seat))
1497     {
1498         DisplayServer *display_server;
1499         display_server = create_display_server (seat, "x"); // FIXME: Not necessarily an X seat, but not sure what to put here
1500         return display_server_start (display_server);
1501     }
1502
1503     /* Get autologin settings */
1504     autologin_username = seat_get_string_property (seat, "autologin-user");
1505     if (g_strcmp0 (autologin_username, "") == 0)
1506         autologin_username = NULL;
1507     autologin_timeout = seat_get_integer_property (seat, "autologin-user-timeout");
1508     autologin_guest = seat_get_boolean_property (seat, "autologin-guest");
1509     autologin_in_background = seat_get_boolean_property (seat, "autologin-in-background");
1510
1511     /* Autologin if configured */
1512     if (autologin_timeout == 0 || autologin_in_background)
1513     {
1514         if (autologin_guest)
1515             session = create_guest_session (seat, NULL);
1516         else if (autologin_username != NULL)
1517             session = create_user_session (seat, autologin_username, TRUE);
1518
1519         if (session)
1520             session_set_pam_service (session, AUTOLOGIN_SERVICE);
1521
1522         /* Load in background if required */
1523         if (autologin_in_background && session)
1524         {
1525             background_session = session;
1526             session = NULL;
1527         }
1528
1529         if (session)
1530         {
1531             DisplayServer *display_server;
1532
1533             if (seat->priv->session_to_activate)
1534                 g_object_unref (seat->priv->session_to_activate);
1535             seat->priv->session_to_activate = g_object_ref (session);
1536
1537             display_server = create_display_server (seat, session_get_session_type (session));
1538             session_set_display_server (session, display_server);
1539             if (!display_server || !display_server_start (display_server))
1540             {
1541                 l_debug (seat, "Can't create display server for automatic login");
1542                 session_stop (session);
1543                 if (display_server)
1544                     display_server_stop (display_server);
1545                 session = NULL;
1546             }
1547         }
1548     }
1549
1550     /* Fallback to a greeter */
1551     if (!session)
1552     {
1553         Greeter *greeter_session;
1554         DisplayServer *display_server;
1555
1556         greeter_session = create_greeter_session (seat);
1557         if (!greeter_session)
1558         {
1559             l_debug (seat, "Failed to create greeter session");
1560             return FALSE;
1561         }
1562
1563         if (seat->priv->session_to_activate)
1564             g_object_unref (seat->priv->session_to_activate);
1565         seat->priv->session_to_activate = g_object_ref (greeter_session);
1566         session = SESSION (greeter_session);
1567
1568         if (autologin_timeout)
1569         {
1570             gchar *value;
1571
1572             value = g_strdup_printf ("%d", autologin_timeout);
1573             greeter_set_hint (greeter_session, "autologin-timeout", value);
1574             g_free (value);
1575             if (autologin_username)
1576                 greeter_set_hint (greeter_session, "autologin-user", autologin_username);
1577             if (autologin_guest)
1578                 greeter_set_hint (greeter_session, "autologin-guest", "true");
1579         }
1580
1581         display_server = create_display_server (seat, session_get_session_type (session));
1582         session_set_display_server (session, display_server);
1583         if (!display_server || !display_server_start (display_server))
1584         {
1585             l_debug (seat, "Can't create display server for greeter");
1586             session_stop (session);
1587             if (display_server)
1588                 display_server_stop (display_server);
1589             session = NULL;
1590         }
1591     }
1592
1593     /* Fail if can't start a session */
1594     if (!session)
1595     {
1596         seat_stop (seat);
1597         return FALSE;
1598     }
1599
1600     /* Start background session */
1601     if (background_session)
1602     {
1603         DisplayServer *background_display_server;
1604
1605         background_display_server = create_display_server (seat, session_get_session_type (background_session));
1606         session_set_display_server (background_session, background_display_server);
1607         if (!display_server_start (background_display_server))
1608             l_warning (seat, "Failed to start display server for background session");
1609     }
1610
1611     seat->priv->started = TRUE;
1612     return TRUE;
1613 }
1614
1615 static Greeter *
1616 seat_real_create_greeter_session (Seat *seat)
1617 {
1618     return greeter_new ();
1619 }
1620
1621 static Session *
1622 seat_real_create_session (Seat *seat)
1623 {
1624     return session_new ();
1625 }
1626
1627 static void
1628 seat_real_set_active_session (Seat *seat, Session *session)
1629 {
1630 }
1631
1632 static void
1633 seat_real_set_next_session (Seat *seat, Session *session)
1634 {
1635 }
1636
1637 static Session *
1638 seat_real_get_active_session (Seat *seat)
1639 {
1640     return NULL;
1641 }
1642
1643 static void
1644 seat_real_stop (Seat *seat)
1645 {
1646     GList *list, *link;
1647
1648     check_stopped (seat);
1649     if (seat->priv->stopped)
1650         return;
1651
1652     /* Stop all the display servers and sessions on the seat. Copy the list as
1653      * it might be modified if a display server / session stops during this loop */
1654     list = g_list_copy (seat->priv->display_servers);
1655     for (link = list; link; link = link->next)
1656         g_object_ref (link->data);
1657     for (link = list; link; link = link->next)
1658     {
1659         DisplayServer *display_server = link->data;
1660         if (!display_server_get_is_stopping (display_server))
1661         {
1662             l_debug (seat, "Stopping display server");
1663             display_server_stop (display_server);
1664         }
1665     }
1666     g_list_free_full (list, g_object_unref);
1667     list = g_list_copy (seat->priv->sessions);
1668     for (link = list; link; link = link->next)
1669         g_object_ref (link->data);
1670     for (link = list; link; link = link->next)
1671     {
1672         Session *session = link->data;
1673         if (!session_get_is_stopping (session))
1674         {
1675             l_debug (seat, "Stopping session");
1676             session_stop (session);
1677         }
1678     }
1679     g_list_free_full (list, g_object_unref);
1680 }
1681
1682 static void
1683 seat_init (Seat *seat)
1684 {
1685     seat->priv = G_TYPE_INSTANCE_GET_PRIVATE (seat, SEAT_TYPE, SeatPrivate);
1686     seat->priv->properties = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
1687     seat->priv->share_display_server = TRUE;
1688 }
1689
1690 static void
1691 seat_finalize (GObject *object)
1692 {
1693     Seat *self;
1694     GList *link;
1695
1696     self = SEAT (object);
1697
1698     g_hash_table_unref (self->priv->properties);
1699     for (link = self->priv->display_servers; link; link = link->next)
1700     {
1701         DisplayServer *display_server = link->data;
1702         g_signal_handlers_disconnect_matched (display_server, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
1703     }
1704     g_list_free_full (self->priv->display_servers, g_object_unref);
1705     for (link = self->priv->sessions; link; link = link->next)
1706     {
1707         Session *session = link->data;
1708         g_signal_handlers_disconnect_matched (session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
1709     }
1710     g_list_free_full (self->priv->sessions, g_object_unref);
1711     if (self->priv->active_session)
1712         g_object_unref (self->priv->active_session);
1713     if (self->priv->next_session)
1714         g_object_unref (self->priv->next_session);
1715     if (self->priv->session_to_activate)
1716         g_object_unref (self->priv->session_to_activate);
1717
1718     G_OBJECT_CLASS (seat_parent_class)->finalize (object);
1719 }
1720
1721 static void
1722 seat_class_init (SeatClass *klass)
1723 {
1724     GObjectClass *object_class = G_OBJECT_CLASS (klass);
1725
1726     klass->get_start_local_sessions = seat_real_get_start_local_sessions;
1727     klass->setup = seat_real_setup;
1728     klass->start = seat_real_start;
1729     klass->create_greeter_session = seat_real_create_greeter_session;
1730     klass->create_session = seat_real_create_session;
1731     klass->set_active_session = seat_real_set_active_session;
1732     klass->get_active_session = seat_real_get_active_session;
1733     klass->set_next_session = seat_real_set_next_session;
1734     klass->run_script = seat_real_run_script;
1735     klass->stop = seat_real_stop;
1736
1737     object_class->finalize = seat_finalize;
1738
1739     g_type_class_add_private (klass, sizeof (SeatPrivate));
1740
1741     signals[SESSION_ADDED] =
1742         g_signal_new ("session-added",
1743                       G_TYPE_FROM_CLASS (klass),
1744                       G_SIGNAL_RUN_LAST,
1745                       G_STRUCT_OFFSET (SeatClass, session_added),
1746                       NULL, NULL,
1747                       NULL,
1748                       G_TYPE_NONE, 1, SESSION_TYPE);
1749     signals[RUNNING_USER_SESSION] =
1750         g_signal_new ("running-user-session",
1751                       G_TYPE_FROM_CLASS (klass),
1752                       G_SIGNAL_RUN_LAST,
1753                       G_STRUCT_OFFSET (SeatClass, running_user_session),
1754                       NULL, NULL,
1755                       NULL,
1756                       G_TYPE_NONE, 1, SESSION_TYPE);
1757     signals[SESSION_REMOVED] =
1758         g_signal_new ("session-removed",
1759                       G_TYPE_FROM_CLASS (klass),
1760                       G_SIGNAL_RUN_LAST,
1761                       G_STRUCT_OFFSET (SeatClass, session_removed),
1762                       NULL, NULL,
1763                       NULL,
1764                       G_TYPE_NONE, 1, SESSION_TYPE);
1765     signals[STOPPED] =
1766         g_signal_new ("stopped",
1767                       G_TYPE_FROM_CLASS (klass),
1768                       G_SIGNAL_RUN_LAST,
1769                       G_STRUCT_OFFSET (SeatClass, stopped),
1770                       NULL, NULL,
1771                       NULL,
1772                       G_TYPE_NONE, 0);
1773 }
1774
1775 static gint
1776 seat_real_logprefix (Logger *self, gchar *buf, gulong buflen)
1777 {
1778     Seat *seat = SEAT (self);
1779     const gchar *name = seat_get_string_property (seat, "seat-name");
1780     if (name)
1781         return g_snprintf (buf, buflen, "Seat %s: ", name);
1782     else
1783         return g_snprintf (buf, buflen, "Seat: ");
1784 }
1785
1786 static void
1787 seat_logger_iface_init (LoggerInterface *iface)
1788 {
1789     iface->logprefix = &seat_real_logprefix;
1790 }