git.ozlabs.org Git - petitboot/blob - discover/device-handler.c

   1 #include <assert.h>
   2 #include <inttypes.h>
   3 #include <stdlib.h>
   4 #include <stdbool.h>
   5 #include <unistd.h>
   6 #include <string.h>
   7 #include <errno.h>
   8 #include <mntent.h>
   9 #include <locale.h>
  10 #include <sys/stat.h>
  11 #include <sys/wait.h>
  12 #include <sys/mount.h>
  13
  14 #include <talloc/talloc.h>
  15 #include <list/list.h>
  16 #include <log/log.h>
  17 #include <types/types.h>
  18 #include <system/system.h>
  19 #include <process/process.h>
  20 #include <url/url.h>
  21 #include <i18n/i18n.h>
  22 #include <pb-config/pb-config.h>
  23
  24 #include <sys/sysmacros.h>
  25 #include <sys/types.h>
  26 #include <sys/socket.h>
  27 #include <netdb.h>
  28 #include <arpa/inet.h>
  29
  30 #include "device-handler.h"
  31 #include "discover-server.h"
  32 #include "devmapper.h"
  33 #include "user-event.h"
  34 #include "platform.h"
  35 #include "event.h"
  36 #include "parser.h"
  37 #include "resource.h"
  38 #include "paths.h"
  39 #include "sysinfo.h"
  40 #include "boot.h"
  41 #include "udev.h"
  42 #include "network.h"
  43 #include "ipmi.h"
  44
  45 enum default_priority {
  46         DEFAULT_PRIORITY_TEMP_USER      = 1,
  47         DEFAULT_PRIORITY_REMOTE         = 2,
  48         DEFAULT_PRIORITY_LOCAL_FIRST    = 3,
  49         DEFAULT_PRIORITY_LOCAL_LAST     = 0xfe,
  50         DEFAULT_PRIORITY_DISABLED       = 0xff,
  51 };
  52
  53 static int default_rescan_timeout = 5 * 60; /* seconds */
  54
  55 struct progress_info {
  56         unsigned int                    percentage;
  57         unsigned long                   size;           /* size in bytes */
  58
  59         const struct process_info       *procinfo;
  60         struct list_item        list;
  61 };
  62
  63 struct device_handler {
  64         struct discover_server  *server;
  65         int                     dry_run;
  66
  67         struct pb_udev          *udev;
  68         struct network          *network;
  69         struct user_event       *user_event;
  70
  71         struct discover_device  **devices;
  72         unsigned int            n_devices;
  73
  74         struct ramdisk_device   **ramdisks;
  75         unsigned int            n_ramdisks;
  76
  77         struct waitset          *waitset;
  78         struct waiter           *timeout_waiter;
  79         bool                    autoboot_enabled;
  80         unsigned int            sec_to_boot;
  81         struct autoboot_option  *temp_autoboot;
  82
  83         struct discover_boot_option *default_boot_option;
  84         struct discover_boot_option *last_boot_option;
  85         int                     default_boot_option_priority;
  86
  87         struct list             unresolved_boot_options;
  88
  89         struct boot_task        *pending_boot;
  90         bool                    pending_boot_is_default;
  91
  92         struct list             progress;
  93         unsigned int            n_progress;
  94
  95         struct plugin_option    **plugins;
  96         unsigned int            n_plugins;
  97         bool                    plugin_installing;
  98 };
  99
 100 static int mount_device(struct discover_device *dev);
 101 static int umount_device(struct discover_device *dev);
 102
 103 static int device_handler_init_sources(struct device_handler *handler);
 104 static void device_handler_reinit_sources(struct device_handler *handler);
 105
 106 static void device_handler_update_lang(const char *lang);
 107
 108 void discover_context_add_boot_option(struct discover_context *ctx,
 109                 struct discover_boot_option *boot_option)
 110 {
 111         boot_option->source = ctx->parser;
 112         list_add_tail(&ctx->boot_options, &boot_option->list);
 113         talloc_steal(ctx, boot_option);
 114 }
 115
 116 /**
 117  * device_handler_get_device_count - Get the count of current handler devices.
 118  */
 119
 120 int device_handler_get_device_count(const struct device_handler *handler)
 121 {
 122         return handler->n_devices;
 123 }
 124
 125 /**
 126  * device_handler_get_device - Get a handler device by index.
 127  */
 128
 129 const struct discover_device *device_handler_get_device(
 130         const struct device_handler *handler, unsigned int index)
 131 {
 132         if (index >= handler->n_devices) {
 133                 assert(0 && "bad index");
 134                 return NULL;
 135         }
 136
 137         return handler->devices[index];
 138 }
 139
 140 /**
 141  * device_handler_get_plugin_count - Get the count of current handler plugins.
 142  */
 143 int device_handler_get_plugin_count(const struct device_handler *handler)
 144 {
 145         return handler->n_plugins;
 146 }
 147
 148 /**
 149  * discover_handler_get_plugin - Get a handler plugin by index.
 150  */
 151 const struct plugin_option *device_handler_get_plugin(
 152         const struct device_handler *handler, unsigned int index)
 153 {
 154         if (index >= handler->n_plugins) {
 155                 assert(0 && "bad index");
 156                 return NULL;
 157         }
 158
 159         return handler->plugins[index];
 160 }
 161
 162 struct network *device_handler_get_network(
 163                 const struct device_handler *handler)
 164 {
 165         return handler->network;
 166 }
 167
 168 struct discover_boot_option *discover_boot_option_create(
 169                 struct discover_context *ctx,
 170                 struct discover_device *device)
 171 {
 172         struct discover_boot_option *opt;
 173
 174         opt = talloc_zero(ctx, struct discover_boot_option);
 175         opt->option = talloc_zero(opt, struct boot_option);
 176         opt->device = device;
 177
 178         return opt;
 179 }
 180
 181 static int device_match_uuid(struct discover_device *dev, const char *uuid)
 182 {
 183         return dev->uuid && !strcmp(dev->uuid, uuid);
 184 }
 185
 186 static int device_match_label(struct discover_device *dev, const char *label)
 187 {
 188         return dev->label && !strcmp(dev->label, label);
 189 }
 190
 191 static int device_match_id(struct discover_device *dev, const char *id)
 192 {
 193         return !strcmp(dev->device->id, id);
 194 }
 195
 196 static int device_match_serial(struct discover_device *dev, const char *serial)
 197 {
 198         const char *val = discover_device_get_param(dev, "ID_SERIAL");
 199         return val && !strcmp(val, serial);
 200 }
 201
 202 static struct discover_device *device_lookup(
 203                 struct device_handler *device_handler,
 204                 int (match_fn)(struct discover_device *, const char *),
 205                 const char *str)
 206 {
 207         struct discover_device *dev;
 208         unsigned int i;
 209
 210         if (!str)
 211                 return NULL;
 212
 213         for (i = 0; i < device_handler->n_devices; i++) {
 214                 dev = device_handler->devices[i];
 215
 216                 if (match_fn(dev, str))
 217                         return dev;
 218         }
 219
 220         return NULL;
 221 }
 222
 223 struct discover_device *device_lookup_by_name(struct device_handler *handler,
 224                 const char *name)
 225 {
 226         if (!strncmp(name, "/dev/", strlen("/dev/")))
 227                 name += strlen("/dev/");
 228
 229         return device_lookup_by_id(handler, name);
 230 }
 231
 232 struct discover_device *device_lookup_by_uuid(
 233                 struct device_handler *device_handler,
 234                 const char *uuid)
 235 {
 236         return device_lookup(device_handler, device_match_uuid, uuid);
 237 }
 238
 239 struct discover_device *device_lookup_by_label(
 240                 struct device_handler *device_handler,
 241                 const char *label)
 242 {
 243         return device_lookup(device_handler, device_match_label, label);
 244 }
 245
 246 struct discover_device *device_lookup_by_id(
 247                 struct device_handler *device_handler,
 248                 const char *id)
 249 {
 250         return device_lookup(device_handler, device_match_id, id);
 251 }
 252
 253 struct discover_device *device_lookup_by_serial(
 254                 struct device_handler *device_handler,
 255                 const char *serial)
 256 {
 257         return device_lookup(device_handler, device_match_serial, serial);
 258 }
 259
 260 void device_handler_destroy(struct device_handler *handler)
 261 {
 262         talloc_free(handler);
 263 }
 264
 265 static int destroy_device(void *arg)
 266 {
 267         struct discover_device *dev = arg;
 268
 269         umount_device(dev);
 270
 271         return 0;
 272 }
 273
 274 struct discover_device *discover_device_create(struct device_handler *handler,
 275                 const char *uuid, const char *id)
 276 {
 277         struct discover_device *dev;
 278
 279         if (uuid)
 280                 dev = device_lookup_by_uuid(handler, uuid);
 281         else
 282                 dev = device_lookup_by_id(handler, id);
 283
 284         if (dev)
 285                 return dev;
 286
 287         dev = talloc_zero(handler, struct discover_device);
 288         dev->device = talloc_zero(dev, struct device);
 289         dev->device->id = talloc_strdup(dev->device, id);
 290         dev->uuid = talloc_strdup(dev, uuid);
 291         list_init(&dev->params);
 292         list_init(&dev->boot_options);
 293
 294         talloc_set_destructor(dev, destroy_device);
 295
 296         return dev;
 297 }
 298
 299 struct discover_device_param {
 300         char                    *name;
 301         char                    *value;
 302         struct list_item        list;
 303 };
 304
 305 void discover_device_set_param(struct discover_device *device,
 306                 const char *name, const char *value)
 307 {
 308         struct discover_device_param *param;
 309         bool found = false;
 310
 311         list_for_each_entry(&device->params, param, list) {
 312                 if (!strcmp(param->name, name)) {
 313                         found = true;
 314                         break;
 315                 }
 316         }
 317
 318         if (!found) {
 319                 if (!value)
 320                         return;
 321                 param = talloc(device, struct discover_device_param);
 322                 param->name = talloc_strdup(param, name);
 323                 list_add(&device->params, &param->list);
 324         } else {
 325                 if (!value) {
 326                         list_remove(&param->list);
 327                         talloc_free(param);
 328                         return;
 329                 }
 330                 talloc_free(param->value);
 331         }
 332
 333         param->value = talloc_strdup(param, value);
 334 }
 335
 336 const char *discover_device_get_param(struct discover_device *device,
 337                 const char *name)
 338 {
 339         struct discover_device_param *param;
 340
 341         list_for_each_entry(&device->params, param, list) {
 342                 if (!strcmp(param->name, name))
 343                         return param->value;
 344         }
 345         return NULL;
 346 }
 347
 348 static void set_env_variables(const struct config *config)
 349 {
 350         if (config->http_proxy)
 351                 setenv("http_proxy", config->http_proxy, 1);
 352         else
 353                 unsetenv("http_proxy");
 354
 355         if (config->https_proxy)
 356                 setenv("https_proxy", config->https_proxy, 1);
 357         else
 358                 unsetenv("https_proxy");
 359
 360         /* Reduce noise in the log from LVM listing open file descriptors */
 361         setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1);
 362 }
 363
 364 struct device_handler *device_handler_init(struct discover_server *server,
 365                 struct waitset *waitset, int dry_run)
 366 {
 367         struct device_handler *handler;
 368         int rc;
 369
 370         handler = talloc_zero(NULL, struct device_handler);
 371         handler->server = server;
 372         handler->waitset = waitset;
 373         handler->dry_run = dry_run;
 374         handler->autoboot_enabled = config_autoboot_active(config_get());
 375
 376         list_init(&handler->unresolved_boot_options);
 377
 378         list_init(&handler->progress);
 379
 380         /* set up our mount point base */
 381         pb_mkdir_recursive(mount_base());
 382
 383         parser_init();
 384
 385         if (config_get()->safe_mode)
 386                 return handler;
 387
 388         set_env_variables(config_get());
 389
 390         rc = device_handler_init_sources(handler);
 391         if (rc) {
 392                 talloc_free(handler);
 393                 return NULL;
 394         }
 395
 396         return handler;
 397 }
 398
 399 void device_handler_reinit(struct device_handler *handler)
 400 {
 401         struct discover_boot_option *opt, *tmp;
 402         struct ramdisk_device *ramdisk;
 403         struct config *config;
 404         unsigned int i;
 405
 406         device_handler_cancel_default(handler);
 407         /* Cancel any pending non-default boot */
 408         if (handler->pending_boot) {
 409                 boot_cancel(handler->pending_boot);
 410                 handler->pending_boot = NULL;
 411                 handler->pending_boot_is_default = false;
 412         }
 413
 414         /* Cancel any remaining async jobs */
 415         process_stop_async_all();
 416         pending_network_jobs_cancel();
 417
 418         /* free unresolved boot options */
 419         list_for_each_entry_safe(&handler->unresolved_boot_options,
 420                         opt, tmp, list)
 421                 talloc_free(opt);
 422         list_init(&handler->unresolved_boot_options);
 423
 424         /* drop all devices */
 425         for (i = 0; i < handler->n_devices; i++) {
 426                 struct discover_device *device = handler->devices[i];
 427                 discover_server_notify_device_remove(handler->server,
 428                                 device->device);
 429                 ramdisk = device->ramdisk;
 430                 if (device->requery_waiter)
 431                         waiter_remove(device->requery_waiter);
 432                 talloc_free(device);
 433                 talloc_free(ramdisk);
 434         }
 435
 436         talloc_free(handler->devices);
 437         handler->devices = NULL;
 438         handler->n_devices = 0;
 439         talloc_free(handler->ramdisks);
 440         handler->ramdisks = NULL;
 441         handler->n_ramdisks = 0;
 442
 443         /* drop any known plugins */
 444         for (i = 0; i < handler->n_plugins; i++)
 445                 talloc_free(handler->plugins[i]);
 446         talloc_free(handler->plugins);
 447         handler->plugins = NULL;
 448         handler->n_plugins = 0;
 449
 450         discover_server_notify_plugins_remove(handler->server);
 451
 452         set_env_variables(config_get());
 453
 454         /* If the safe mode warning was active disable it now */
 455         if (config_get()->safe_mode) {
 456                 config = config_copy(handler, config_get());
 457                 config->safe_mode = false;
 458                 config_set(config);
 459                 discover_server_notify_config(handler->server, config);
 460         }
 461
 462         /* Force rediscovery on SCSI devices */
 463         process_run_simple(handler, pb_system_apps.scsi_rescan, NULL);
 464
 465         device_handler_reinit_sources(handler);
 466 }
 467
 468 void device_handler_remove(struct device_handler *handler,
 469                 struct discover_device *device)
 470 {
 471         struct discover_boot_option *opt, *tmp;
 472         unsigned int i;
 473
 474         if (device->requery_waiter)
 475                 waiter_remove(device->requery_waiter);
 476
 477         list_for_each_entry_safe(&device->boot_options, opt, tmp, list) {
 478                 if (opt == handler->default_boot_option) {
 479                         pb_log("Default option %s cancelled since device removed",
 480                                         opt->option->name);
 481                         device_handler_cancel_default(handler);
 482                         break;
 483                 }
 484         }
 485
 486         for (i = 0; i < handler->n_devices; i++)
 487                 if (handler->devices[i] == device)
 488                         break;
 489
 490         if (i == handler->n_devices) {
 491                 talloc_free(device);
 492                 return;
 493         }
 494
 495         /* Free any unresolved options, as they're currently allocated
 496          * against the handler */
 497         list_for_each_entry_safe(&handler->unresolved_boot_options,
 498                         opt, tmp, list) {
 499                 if (opt->device != device)
 500                         continue;
 501                 list_remove(&opt->list);
 502                 talloc_free(opt);
 503         }
 504
 505         /* if this is a network device, we have to unregister it from the
 506          * network code */
 507         if (device->device->type == DEVICE_TYPE_NETWORK)
 508                 network_unregister_device(handler->network, device);
 509
 510         handler->n_devices--;
 511         memmove(&handler->devices[i], &handler->devices[i + 1],
 512                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 513         handler->devices = talloc_realloc(handler, handler->devices,
 514                 struct discover_device *, handler->n_devices);
 515
 516         if (device->notified)
 517                 discover_server_notify_device_remove(handler->server,
 518                                                         device->device);
 519
 520         talloc_free(device);
 521 }
 522
 523 void device_handler_status(struct device_handler *handler,
 524                 struct status *status)
 525 {
 526         pb_debug("%s: %s\n", __func__, status->message);
 527         discover_server_notify_boot_status(handler->server, status);
 528 }
 529
 530 static void _device_handler_vstatus(struct device_handler *handler,
 531                 enum status_type type, const char *fmt, va_list ap)
 532 {
 533         struct status status;
 534
 535         status.type = type;
 536         status.message = talloc_vasprintf(handler, fmt, ap);
 537         status.backlog = false;
 538         status.boot_active = false;
 539
 540         device_handler_status(handler, &status);
 541
 542         talloc_free(status.message);
 543 }
 544
 545 static void _device_handler_vdevstatus(struct device_handler *handler,
 546                 struct discover_device *device, enum status_type type,
 547                 const char *fmt, va_list ap)
 548 {
 549         char *msg;
 550
 551         msg = talloc_asprintf(handler, "[%s] %s",
 552                         device ? device->device->id : "unknown", fmt);
 553         _device_handler_vstatus(handler, type, msg, ap);
 554         talloc_free(msg);
 555 }
 556
 557 void device_handler_status_dev_info(struct device_handler *handler,
 558                 struct discover_device *dev, const char *fmt, ...)
 559 {
 560         va_list ap;
 561
 562         va_start(ap, fmt);
 563         _device_handler_vdevstatus(handler, dev, STATUS_INFO, fmt, ap);
 564         va_end(ap);
 565 }
 566
 567 void device_handler_status_dev_err(struct device_handler *handler,
 568                 struct discover_device *dev, const char *fmt, ...)
 569 {
 570         va_list ap;
 571
 572         va_start(ap, fmt);
 573         _device_handler_vdevstatus(handler, dev, STATUS_ERROR, fmt, ap);
 574         va_end(ap);
 575 }
 576
 577 void device_handler_status_info(struct device_handler *handler,
 578                 const char *fmt, ...)
 579 {
 580         va_list ap;
 581
 582         va_start(ap, fmt);
 583         _device_handler_vstatus(handler, STATUS_INFO, fmt, ap);
 584         va_end(ap);
 585 }
 586
 587 void device_handler_status_err(struct device_handler *handler,
 588                 const char *fmt, ...)
 589 {
 590         va_list ap;
 591
 592         va_start(ap, fmt);
 593         _device_handler_vstatus(handler, STATUS_ERROR, fmt, ap);
 594         va_end(ap);
 595 }
 596
 597 void device_handler_status_download(struct device_handler *handler,
 598                 const struct process_info *procinfo,
 599                 unsigned int percentage, unsigned int size, char suffix)
 600 {
 601         struct progress_info *p, *progress = NULL;
 602         uint64_t current_converted, current = 0;
 603         const char *units = " kMGTP";
 604         unsigned long size_bytes;
 605         char *update = NULL;
 606         double total = 0;
 607         unsigned int i;
 608         int unit = 0;
 609
 610         list_for_each_entry(&handler->progress, p, list)
 611                 if (p->procinfo == procinfo)
 612                         progress = p;
 613
 614         if (!progress) {
 615                 pb_log("Registering new progress struct\n");
 616                 progress = talloc_zero(handler, struct progress_info);
 617                 if (!progress) {
 618                         pb_log("Failed to allocate room for progress struct\n");
 619                         return;
 620                 }
 621                 progress->procinfo = procinfo;
 622                 list_add(&handler->progress, &progress->list);
 623                 handler->n_progress++;
 624         }
 625
 626         size_bytes = size;
 627         for (i = 0; i < strlen(units); i++) {
 628                 if (units[i] == suffix)
 629                         break;
 630         }
 631
 632         if (i >= strlen(units)) {
 633             pb_log("Couldn't recognise suffix '%c'\n", suffix);
 634             size_bytes = 0;
 635         } else {
 636                 while (i--)
 637                         size_bytes <<= 10;
 638         }
 639
 640         progress->percentage = percentage;
 641         progress->size = size_bytes;
 642
 643         /*
 644          * Aggregate the info we have and update status. If a progress struct
 645          * has zero for both percentage and size we assume progress information
 646          * is unavailable and fall back to a generic progress message.
 647          */
 648         list_for_each_entry(&handler->progress, p, list) {
 649                 uint64_t c;
 650                 double t;
 651                 if (!p->percentage || !p->size) {
 652                         update = talloc_asprintf(handler,
 653                                         _("%u downloads in progress..."),
 654                                         handler->n_progress);
 655                         current = total = 0;
 656                         break;
 657                 }
 658
 659                 c = p->size;
 660                 t = (100 * c) / p->percentage;
 661
 662                 current += c;
 663                 total += t;
 664         }
 665
 666         if (total) {
 667                 current_converted = current;
 668                 while (current_converted >= 1000) {
 669                         current_converted >>= 10;
 670                         unit++;
 671                 }
 672                 update = talloc_asprintf(handler,
 673                                 _("%u %s downloading: %.0f%% - %" PRIu64 "%cB"),
 674                                 handler->n_progress,
 675                                 ngettext("item", "items", handler->n_progress),
 676                                 (current / total) * 100, current_converted,
 677                                 units[unit]);
 678         }
 679
 680         if (!update) {
 681                 pb_log_fn("failed to allocate new status\n");
 682         } else {
 683                 device_handler_status_info(handler, "%s\n", update);
 684                 talloc_free(update);
 685         }
 686 }
 687
 688 static void device_handler_plugin_scan_device(struct device_handler *handler,
 689                 struct discover_device *dev)
 690 {
 691         int rc;
 692
 693         pb_debug("Scanning %s for plugin files\n", dev->device->id);
 694
 695         rc = process_run_simple(handler, pb_system_apps.pb_plugin,
 696                                 "scan", dev->mount_path,
 697                                 NULL);
 698         if (rc)
 699                 pb_log("Error from pb-plugin scan %s\n",
 700                                 dev->mount_path);
 701 }
 702
 703 void device_handler_status_download_remove(struct device_handler *handler,
 704                 struct process_info *procinfo)
 705 {
 706         struct progress_info *p, *tmp;
 707
 708         list_for_each_entry_safe(&handler->progress, p, tmp, list)
 709                 if (p->procinfo == procinfo) {
 710                         list_remove(&p->list);
 711                         talloc_free(p);
 712                         handler->n_progress--;
 713                 }
 714 }
 715
 716 static void device_handler_boot_status_cb(void *arg, struct status *status)
 717 {
 718         struct device_handler *handler = arg;
 719
 720         /* boot had failed; update handler state to allow a new default if one
 721          * is found later
 722          */
 723         if (status->type == STATUS_ERROR) {
 724                 handler->pending_boot = NULL;
 725                 handler->default_boot_option = NULL;
 726         }
 727
 728         device_handler_status(handler, status);
 729 }
 730
 731 static void countdown_status(struct device_handler *handler,
 732                 struct discover_boot_option *opt, unsigned int sec)
 733 {
 734         struct status status;
 735
 736         status.type = STATUS_INFO;
 737         status.message = talloc_asprintf(handler,
 738                         _("Booting in %d sec: [%s] %s"), sec,
 739                         opt->device->device->id, opt->option->name);
 740         status.backlog = false;
 741
 742         device_handler_status(handler, &status);
 743
 744         talloc_free(status.message);
 745 }
 746
 747 static int default_timeout(void *arg)
 748 {
 749         struct device_handler *handler = arg;
 750         struct discover_boot_option *opt;
 751
 752         if (!handler->default_boot_option)
 753                 return 0;
 754
 755         if (handler->pending_boot)
 756                 return 0;
 757
 758         opt = handler->default_boot_option;
 759
 760         handler->last_boot_option = opt;
 761
 762         if (handler->sec_to_boot) {
 763                 countdown_status(handler, opt, handler->sec_to_boot);
 764                 handler->sec_to_boot--;
 765                 handler->timeout_waiter = waiter_register_timeout(
 766                                                 handler->waitset, 1000,
 767                                                 default_timeout, handler);
 768                 return 0;
 769         }
 770
 771         handler->timeout_waiter = NULL;
 772
 773         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 774
 775         platform_pre_boot();
 776
 777         handler->pending_boot = boot(handler, handler->default_boot_option,
 778                         NULL, handler->dry_run, device_handler_boot_status_cb,
 779                         handler);
 780         handler->pending_boot_is_default = true;
 781         return 0;
 782 }
 783
 784 struct {
 785         enum ipmi_bootdev       ipmi_type;
 786         enum device_type        device_type;
 787 } device_type_map[] = {
 788         { IPMI_BOOTDEV_NETWORK, DEVICE_TYPE_NETWORK },
 789         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_DISK },
 790         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_USB },
 791         { IPMI_BOOTDEV_CDROM, DEVICE_TYPE_OPTICAL },
 792 };
 793
 794 static bool ipmi_device_type_matches(enum ipmi_bootdev ipmi_type,
 795                 enum device_type device_type)
 796 {
 797         unsigned int i;
 798
 799         for (i = 0; i < ARRAY_SIZE(device_type_map); i++) {
 800                 if (device_type_map[i].device_type == device_type)
 801                         return device_type_map[i].ipmi_type == ipmi_type;
 802         }
 803
 804         return false;
 805 }
 806
 807 static bool autoboot_option_matches(struct autoboot_option *opt,
 808                 struct discover_device *dev)
 809 {
 810         if (opt->boot_type == BOOT_DEVICE_UUID)
 811                 if (!strcmp(opt->uuid, dev->uuid))
 812                         return true;
 813
 814         if (opt->boot_type == BOOT_DEVICE_TYPE)
 815                 if (opt->type == dev->device->type ||
 816                     opt->type == DEVICE_TYPE_ANY)
 817                         return true;
 818
 819         return false;
 820 }
 821
 822 static int autoboot_option_priority(const struct config *config,
 823                                 struct discover_boot_option *opt)
 824 {
 825         struct autoboot_option *auto_opt;
 826         unsigned int i;
 827
 828         for (i = 0; i < config->n_autoboot_opts; i++) {
 829                 auto_opt = &config->autoboot_opts[i];
 830                 if (autoboot_option_matches(auto_opt, opt->device))
 831                         return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 832         }
 833
 834         return -1;
 835 }
 836
 837 /*
 838  * We have different priorities to resolve conflicts between boot options that
 839  * report to be the default for their device. This function assigns a priority
 840  * for these options.
 841  */
 842 static enum default_priority default_option_priority(
 843                 struct device_handler *handler,
 844                 struct discover_boot_option *opt)
 845 {
 846         const struct config *config;
 847
 848         /* Temporary user-provided autoboot options have highest priority */
 849         if (handler->temp_autoboot) {
 850                 if (autoboot_option_matches(handler->temp_autoboot,
 851                                         opt->device))
 852                         return DEFAULT_PRIORITY_TEMP_USER;
 853
 854                 pb_debug("handler: disabled default priority due to "
 855                                 "temporary user override\n");
 856                 return DEFAULT_PRIORITY_DISABLED;
 857         }
 858
 859         config = config_get();
 860
 861         /* Next highest priority to IPMI-configured boot options. If we have an
 862          * IPMI bootdev configuration set, then we don't allow any other
 863          * defaults */
 864         if (config->ipmi_bootdev) {
 865                 bool ipmi_match = ipmi_device_type_matches(config->ipmi_bootdev,
 866                                 opt->device->device->type);
 867                 if (ipmi_match)
 868                         return DEFAULT_PRIORITY_REMOTE;
 869
 870                 pb_debug("handler: disabled default priority due to "
 871                                 "non-matching IPMI type %x\n",
 872                                 config->ipmi_bootdev);
 873                 return DEFAULT_PRIORITY_DISABLED;
 874         }
 875
 876         /* Next, try to match the option against the user-defined autoboot
 877          * options, either by device UUID or type. */
 878         if (config->n_autoboot_opts) {
 879                 int boot_match = autoboot_option_priority(config, opt);
 880                 if (boot_match > 0)
 881                         return boot_match;
 882         } else {
 883                 /* If there is no specific boot order, boot any device */
 884                 return DEFAULT_PRIORITY_LOCAL_FIRST;
 885         }
 886
 887         /* If the option didn't match any entry in the array, it is disabled */
 888         pb_debug("handler: disabled default priority due to "
 889                         "non-matching UUID or type\n");
 890         return DEFAULT_PRIORITY_DISABLED;
 891 }
 892
 893 static void set_default(struct device_handler *handler,
 894                 struct discover_boot_option *opt)
 895 {
 896         enum default_priority cur_prio, new_prio;
 897
 898         if (!handler->autoboot_enabled)
 899                 return;
 900
 901         pb_debug("handler: new default option: %s\n", opt->option->id);
 902
 903         new_prio = default_option_priority(handler, opt);
 904
 905         /* Anything outside our range prevents a default boot */
 906         if (new_prio >= DEFAULT_PRIORITY_DISABLED)
 907                 return;
 908
 909         pb_debug("handler: calculated priority %d\n", new_prio);
 910
 911         /* Resolve any conflicts: if we have a new default option, it only
 912          * replaces the current if it has a higher priority. */
 913         if (handler->default_boot_option) {
 914
 915                 cur_prio = handler->default_boot_option_priority;
 916
 917                 if (new_prio < cur_prio) {
 918                         pb_log("handler: new prio %d beats "
 919                                         "old prio %d for %s\n",
 920                                         new_prio, cur_prio,
 921                                         handler->default_boot_option
 922                                                 ->option->id);
 923                         handler->default_boot_option = opt;
 924                         handler->default_boot_option_priority = new_prio;
 925                         /* extend the timeout a little, so the user sees some
 926                          * indication of the change */
 927                         handler->sec_to_boot += 2;
 928                 }
 929
 930                 return;
 931         }
 932
 933         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 934         handler->default_boot_option = opt;
 935         handler->default_boot_option_priority = new_prio;
 936
 937         pb_log("handler: boot option %s set as default, timeout %u sec.\n",
 938                opt->option->id, handler->sec_to_boot);
 939
 940         default_timeout(handler);
 941 }
 942
 943 static char *autoboot_option_desc(void *ctx, const struct autoboot_option *opt)
 944 {
 945         const char *type, *val;
 946
 947         if (opt->boot_type == BOOT_DEVICE_TYPE) {
 948                 type = _("device type");
 949                 val = device_type_display_name(opt->type);
 950         } else if (opt->boot_type == BOOT_DEVICE_UUID) {
 951                 type = _("device UUID");
 952                 val = opt->uuid;
 953         } else {
 954                 type = _("unknown specifier");
 955                 val = NULL;
 956         }
 957
 958         return talloc_asprintf(ctx, "%s = %s", type, val);
 959 }
 960
 961 void device_handler_apply_temp_autoboot(struct device_handler *handler,
 962                 struct autoboot_option *opt)
 963 {
 964         unsigned int i;
 965         char *desc;
 966
 967         handler->temp_autoboot = talloc_steal(handler, opt);
 968
 969         desc = autoboot_option_desc(handler, opt);
 970         device_handler_status_info(handler,
 971                         _("Applying temporary autoboot override: %s"),
 972                         desc);
 973         talloc_free(desc);
 974
 975         if (!handler->autoboot_enabled)
 976                 return;
 977
 978         if (!handler->default_boot_option)
 979                 return;
 980
 981         if (autoboot_option_matches(opt, handler->default_boot_option->device))
 982                 return;
 983
 984         /* cancel the default, and rescan available options */
 985         device_handler_cancel_default(handler);
 986
 987         handler->autoboot_enabled = true;
 988
 989         for (i = 0; i < handler->n_devices; i++) {
 990                 struct discover_device *dev = handler->devices[i];
 991                 struct discover_boot_option *boot_opt;
 992
 993                 if (!autoboot_option_matches(opt, dev))
 994                         continue;
 995
 996                 list_for_each_entry(&dev->boot_options, boot_opt, list) {
 997                         if (boot_opt->option->is_default) {
 998                                 set_default(handler, boot_opt);
 999                                 break;
1000                         }
1001                 }
1002         }
1003 }
1004
1005 static bool resource_is_resolved(struct resource *res)
1006 {
1007         return !res || res->resolved;
1008 }
1009
1010 /* We only use this in an assert, which will disappear if we're compiling
1011  * with NDEBUG, so we need the 'used' attribute for these builds */
1012 static bool __attribute__((used)) boot_option_is_resolved(
1013                 struct discover_boot_option *opt)
1014 {
1015         return resource_is_resolved(opt->boot_image) &&
1016                 resource_is_resolved(opt->initrd) &&
1017                 resource_is_resolved(opt->dtb) &&
1018                 resource_is_resolved(opt->args_sig_file) &&
1019                 resource_is_resolved(opt->icon);
1020 }
1021
1022 static bool resource_resolve(struct resource *res, const char *name,
1023                 struct discover_boot_option *opt,
1024                 struct device_handler *handler)
1025 {
1026         struct parser *parser = opt->source;
1027
1028         if (resource_is_resolved(res))
1029                 return true;
1030
1031         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
1032                         opt->option->id, name, parser->name);
1033         parser->resolve_resource(handler, res);
1034
1035         return res->resolved;
1036 }
1037
1038 static bool boot_option_resolve(struct discover_boot_option *opt,
1039                 struct device_handler *handler)
1040 {
1041         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
1042                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
1043                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
1044                 resource_resolve(opt->args_sig_file, "args_sig_file", opt,
1045                         handler) &&
1046                 resource_resolve(opt->icon, "icon", opt, handler);
1047 }
1048
1049 static void boot_option_finalise(struct device_handler *handler,
1050                 struct discover_boot_option *opt)
1051 {
1052         assert(boot_option_is_resolved(opt));
1053
1054         /* check that the parsers haven't set any of the final data */
1055         assert(!opt->option->boot_image_file);
1056         assert(!opt->option->initrd_file);
1057         assert(!opt->option->dtb_file);
1058         assert(!opt->option->icon_file);
1059         assert(!opt->option->device_id);
1060         assert(!opt->option->args_sig_file);
1061
1062         if (opt->boot_image)
1063                 opt->option->boot_image_file = opt->boot_image->url->full;
1064         if (opt->initrd)
1065                 opt->option->initrd_file = opt->initrd->url->full;
1066         if (opt->dtb)
1067                 opt->option->dtb_file = opt->dtb->url->full;
1068         if (opt->icon)
1069                 opt->option->icon_file = opt->icon->url->full;
1070         if (opt->args_sig_file)
1071                 opt->option->args_sig_file = opt->args_sig_file->url->full;
1072
1073         opt->option->device_id = opt->device->device->id;
1074
1075         if (opt->option->is_default)
1076                 set_default(handler, opt);
1077 }
1078
1079 static void notify_boot_option(struct device_handler *handler,
1080                 struct discover_boot_option *opt)
1081 {
1082         struct discover_device *dev = opt->device;
1083
1084         if (!dev->notified)
1085                 discover_server_notify_device_add(handler->server,
1086                                                   opt->device->device);
1087         dev->notified = true;
1088         discover_server_notify_boot_option_add(handler->server, opt->option);
1089 }
1090
1091 static void process_boot_option_queue(struct device_handler *handler)
1092 {
1093         struct discover_boot_option *opt, *tmp;
1094
1095         list_for_each_entry_safe(&handler->unresolved_boot_options,
1096                         opt, tmp, list) {
1097
1098                 pb_debug("queue: attempting resolution for %s\n",
1099                                 opt->option->id);
1100
1101                 if (!boot_option_resolve(opt, handler))
1102                         continue;
1103
1104                 pb_debug("\tresolved!\n");
1105
1106                 list_remove(&opt->list);
1107                 list_add_tail(&opt->device->boot_options, &opt->list);
1108                 talloc_steal(opt->device, opt);
1109                 boot_option_finalise(handler, opt);
1110                 notify_boot_option(handler, opt);
1111         }
1112 }
1113
1114 struct discover_context *device_handler_discover_context_create(
1115                 struct device_handler *handler,
1116                 struct discover_device *device)
1117 {
1118         struct discover_context *ctx;
1119
1120         ctx = talloc_zero(handler, struct discover_context);
1121         ctx->handler = handler;
1122         ctx->device = device;
1123         list_init(&ctx->boot_options);
1124
1125         return ctx;
1126 }
1127
1128 void device_handler_add_device(struct device_handler *handler,
1129                 struct discover_device *device)
1130 {
1131         handler->n_devices++;
1132         handler->devices = talloc_realloc(handler, handler->devices,
1133                                 struct discover_device *, handler->n_devices);
1134         handler->devices[handler->n_devices - 1] = device;
1135
1136         if (device->device->type == DEVICE_TYPE_NETWORK)
1137                 network_register_device(handler->network, device);
1138 }
1139
1140 void device_handler_add_ramdisk(struct device_handler *handler,
1141                 const char *path)
1142 {
1143         struct ramdisk_device *dev;
1144         unsigned int i;
1145
1146         if (!path)
1147                 return;
1148
1149         for (i = 0; i < handler->n_ramdisks; i++)
1150                 if (!strcmp(handler->ramdisks[i]->path, path))
1151                         return;
1152
1153         dev = talloc_zero(handler, struct ramdisk_device);
1154         if (!dev) {
1155                 pb_log("Failed to allocate memory to track %s\n", path);
1156                 return;
1157         }
1158
1159         dev->path = talloc_strdup(handler, path);
1160
1161         handler->ramdisks = talloc_realloc(handler, handler->ramdisks,
1162                                 struct ramdisk_device *,
1163                                 handler->n_ramdisks + 1);
1164         if (!handler->ramdisks) {
1165                 pb_log("Failed to reallocate memory"
1166                        "- ramdisk tracking inconsistent!\n");
1167                 return;
1168         }
1169
1170         handler->ramdisks[i] = dev;
1171         i = handler->n_ramdisks++;
1172 }
1173
1174 struct ramdisk_device *device_handler_get_ramdisk(
1175                 struct device_handler *handler)
1176 {
1177         unsigned int i;
1178         char *name;
1179         dev_t id;
1180
1181         /* Check if free ramdisk exists */
1182         for (i = 0; i < handler->n_ramdisks; i++)
1183                 if (!handler->ramdisks[i]->snapshot &&
1184                     !handler->ramdisks[i]->origin &&
1185                     !handler->ramdisks[i]->base)
1186                         return handler->ramdisks[i];
1187
1188         /* Otherwise create a new one */
1189         name = talloc_asprintf(handler, "/dev/ram%d",
1190                         handler->n_ramdisks);
1191         if (!name) {
1192                 pb_debug("Failed to allocate memory to name /dev/ram%d",
1193                         handler->n_ramdisks);
1194                 return NULL;
1195         }
1196
1197         id = makedev(1, handler->n_ramdisks);
1198         if (mknod(name, S_IFBLK, id)) {
1199                 if (errno == EEXIST) {
1200                         /* We haven't yet received updates for existing
1201                          * ramdisks - add and use this one */
1202                         pb_debug("Using untracked ramdisk %s\n", name);
1203                 } else {
1204                         pb_log("Failed to create new ramdisk %s: %s\n",
1205                                name, strerror(errno));
1206                         return NULL;
1207                 }
1208         }
1209         device_handler_add_ramdisk(handler, name);
1210         talloc_free(name);
1211
1212         return handler->ramdisks[i];
1213 }
1214
1215 void device_handler_release_ramdisk(struct discover_device *device)
1216 {
1217         struct ramdisk_device *ramdisk = device->ramdisk;
1218
1219         talloc_free(ramdisk->snapshot);
1220         talloc_free(ramdisk->origin);
1221         talloc_free(ramdisk->base);
1222
1223         ramdisk->snapshot = ramdisk->origin = ramdisk->base = NULL;
1224         ramdisk->sectors = 0;
1225
1226         device->ramdisk = NULL;
1227 }
1228
1229 /* Start discovery on a hotplugged device. The device will be in our devices
1230  * array, but has only just been initialised by the hotplug source.
1231  */
1232 int device_handler_discover(struct device_handler *handler,
1233                 struct discover_device *dev)
1234 {
1235         struct discover_context *ctx;
1236         int rc;
1237
1238         device_handler_status_dev_info(handler, dev,
1239                 /*
1240                  * TRANSLATORS: this string will be passed the type of the
1241                  * device (eg "disk" or "network"), which will be translated
1242                  * accordingly.
1243                  */
1244                 _("Processing new %s device"),
1245                 device_type_display_name(dev->device->type));
1246
1247         /* create our context */
1248         ctx = device_handler_discover_context_create(handler, dev);
1249
1250         rc = mount_device(dev);
1251         if (rc)
1252                 goto out;
1253
1254         /* add this device to our system info */
1255         system_info_register_blockdev(dev->device->id, dev->uuid,
1256                         dev->mount_path);
1257
1258         /* run the parsers. This will populate the ctx's boot_option list. */
1259         iterate_parsers(ctx);
1260
1261         /* add discovered stuff to the handler */
1262         device_handler_discover_context_commit(handler, ctx);
1263
1264         process_boot_option_queue(handler);
1265
1266         /* Check this device for pb-plugins */
1267         device_handler_plugin_scan_device(handler, dev);
1268 out:
1269         talloc_unlink(handler, ctx);
1270
1271         return 0;
1272 }
1273
1274 struct requery_data {
1275         struct device_handler   *handler;
1276         struct discover_device  *device;
1277 };
1278
1279 static int device_handler_requery_timeout_fn(void *data)
1280 {
1281         struct discover_boot_option *opt, *tmp;
1282         struct requery_data *rqd = data;
1283         struct device_handler *handler;
1284         struct discover_device *device;
1285         bool autoboot;
1286
1287         handler = rqd->handler;
1288         device = rqd->device;
1289
1290         talloc_free(rqd);
1291
1292         /* network_requery_device may re-add a timeout, so clear the device
1293          * waiter here, so we can potentially start a new one. */
1294         device->requery_waiter = NULL;
1295
1296         /* We keep the device around, but get rid of the parsed boot
1297          * options on that device. That involves delaring out the lists,
1298          * and potentially cancelling a default.
1299          */
1300         list_for_each_entry_safe(&handler->unresolved_boot_options,
1301                         opt, tmp, list) {
1302                 if (opt->device != device)
1303                         continue;
1304                 list_remove(&opt->list);
1305                 talloc_free(opt);
1306         }
1307
1308         /* Track whether autoboot was enabled, if we cancel a default option
1309          * it will be switched off.
1310          */
1311         autoboot = handler->autoboot_enabled;
1312
1313         list_for_each_entry_safe(&device->boot_options, opt, tmp, list) {
1314                 if (opt == handler->default_boot_option) {
1315                         pb_log("Default option %s cancelled since device is being requeried\n",
1316                                         opt->option->name);
1317                         device_handler_cancel_default(handler);
1318                 }
1319                 list_remove(&opt->list);
1320                 talloc_free(opt);
1321         }
1322
1323         handler->autoboot_enabled = autoboot;
1324
1325         discover_server_notify_device_remove(handler->server, device->device);
1326         device->notified = false;
1327
1328         network_requery_device(handler->network, device);
1329
1330         return 0;
1331 }
1332
1333 /* Schedule a requery in timeout (seconds).
1334  *
1335  * Special values of timeout:
1336  *   0: no requery
1337  *  -1: use default
1338  */
1339 void device_handler_start_requery_timeout( struct device_handler *handler,
1340                 struct discover_device *dev, int timeout)
1341 {
1342         struct requery_data *rqd;
1343
1344         if (dev->requery_waiter)
1345                 return;
1346
1347         if (timeout == -1)
1348                 timeout = default_rescan_timeout;
1349         else if (timeout == 0)
1350                 return;
1351
1352         rqd = talloc(dev, struct requery_data);
1353         rqd->handler = handler;
1354         rqd->device = dev;
1355
1356         pb_debug("starting requery timeout for device %s, in %d sec\n",
1357                         dev->device->id, timeout);
1358
1359         dev->requery_waiter = waiter_register_timeout(handler->waitset,
1360                         timeout * 1000, device_handler_requery_timeout_fn, rqd);
1361 }
1362
1363 static int event_requery_timeout(struct event *event)
1364 {
1365         int timeout = -1;
1366         unsigned long x;
1367         const char *str;
1368         char *endp;
1369
1370         if (!event)
1371                 return timeout;
1372
1373         str = event_get_param(event, "reboottime");
1374         if (!str)
1375                 return timeout;
1376
1377         x = strtoul(str, &endp, 0);
1378         if (endp != str)
1379                 timeout = x;
1380
1381         return timeout;
1382 }
1383
1384
1385 /* Incoming dhcp event */
1386 int device_handler_dhcp(struct device_handler *handler,
1387                 struct discover_device *dev, struct event *event)
1388 {
1389         struct discover_context *ctx;
1390         const char *ip;
1391
1392         if (event_get_param(event, "ipv6"))
1393                 ip = event_get_param(event, "ipv6");
1394         else
1395                 ip = event_get_param(event, "ip");
1396
1397         device_handler_status_dev_info(handler, dev,
1398                         _("Processing DHCP lease response (ip: %s)"), ip);
1399
1400         pending_network_jobs_start();
1401
1402         /* create our context */
1403         ctx = device_handler_discover_context_create(handler, dev);
1404         talloc_steal(ctx, event);
1405         ctx->event = event;
1406
1407         device_handler_start_requery_timeout(handler, dev,
1408                         event_requery_timeout(event));
1409
1410         iterate_parsers(ctx);
1411
1412         device_handler_discover_context_commit(handler, ctx);
1413
1414         talloc_unlink(handler, ctx);
1415
1416         return 0;
1417 }
1418
1419 struct discover_boot_option *device_handler_find_option_by_name(
1420                 struct device_handler *handler, const char *device,
1421                 const char *name)
1422 {
1423         size_t len = strlen(name);
1424         unsigned int i;
1425
1426         for (i = 0; i < handler->n_devices; i++) {
1427                 struct discover_device *dev = handler->devices[i];
1428                 struct discover_boot_option *opt;
1429
1430                 list_for_each_entry(&dev->boot_options, opt, list)
1431                         /* Match exactly, partial matches can be quite common */
1432                         if (strlen(opt->option->name) == len &&
1433                                         !strcmp(opt->option->name, name))
1434                                 if (!dev || !strcmp(opt->option->device_id, device))
1435                                         return opt;
1436         }
1437
1438         return NULL;
1439 }
1440
1441 static struct discover_boot_option *find_boot_option_by_id(
1442                 struct device_handler *handler, const char *id)
1443 {
1444         unsigned int i;
1445
1446         for (i = 0; i < handler->n_devices; i++) {
1447                 struct discover_device *dev = handler->devices[i];
1448                 struct discover_boot_option *opt;
1449
1450                 list_for_each_entry(&dev->boot_options, opt, list)
1451                         if (!strcmp(opt->option->id, id))
1452                                 return opt;
1453         }
1454
1455         return NULL;
1456 }
1457
1458 void device_handler_boot(struct device_handler *handler,
1459                 bool change_default, struct boot_command *cmd)
1460 {
1461         struct discover_boot_option *opt = NULL;
1462
1463         if (cmd->option_id && strlen(cmd->option_id))
1464                 opt = find_boot_option_by_id(handler, cmd->option_id);
1465
1466         /* Don't allow a normal client to change the default */
1467         if (!change_default && handler->last_boot_option &&
1468                         opt != handler->last_boot_option) {
1469                 pb_log("Non-root user tried to change boot option\n");
1470                 device_handler_status_err(handler,
1471                                 "Must be root to change default boot option\n");
1472                 return;
1473         }
1474
1475         if (handler->pending_boot)
1476                 boot_cancel(handler->pending_boot);
1477
1478         platform_pre_boot();
1479
1480         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
1481                         device_handler_boot_status_cb, handler);
1482         handler->pending_boot_is_default = false;
1483 }
1484
1485 void device_handler_cancel_default(struct device_handler *handler)
1486 {
1487         if (handler->timeout_waiter)
1488                 waiter_remove(handler->timeout_waiter);
1489
1490         handler->timeout_waiter = NULL;
1491         handler->autoboot_enabled = false;
1492
1493         /* we only send status if we had a default boot option queued */
1494         if (!handler->default_boot_option)
1495                 return;
1496
1497         pb_log("Cancelling default boot option\n");
1498
1499         if (handler->pending_boot && handler->pending_boot_is_default) {
1500                 boot_cancel(handler->pending_boot);
1501                 handler->pending_boot = NULL;
1502                 handler->pending_boot_is_default = false;
1503         }
1504
1505         handler->default_boot_option = NULL;
1506
1507         device_handler_status_info(handler, _("Default boot cancelled"));
1508 }
1509
1510 void device_handler_update_config(struct device_handler *handler,
1511                 struct config *config)
1512 {
1513         int rc;
1514
1515         rc = config_set(config);
1516         if (rc) {
1517                 device_handler_status_err(handler,
1518                                 "Failed to update configuration!");
1519                 return;
1520         }
1521
1522         discover_server_notify_config(handler->server, config);
1523         device_handler_update_lang(config->lang);
1524         device_handler_reinit(handler);
1525 }
1526
1527 static char *device_from_addr(void *ctx, struct pb_url *url)
1528 {
1529         char *ipaddr, *buf, *tok, *dev = NULL;
1530         bool ipv6_route;
1531         const char *delim = " ";
1532         struct sockaddr_in *ipv4;
1533         struct sockaddr_in6 *ipv6;
1534         struct addrinfo *res;
1535         struct process *p;
1536         int rc;
1537
1538         /* Confirm url->host is either a valid hostname, or a
1539          * valid IPv4 or IPv6 address */
1540         rc = getaddrinfo(url->host, NULL, NULL, &res);
1541         if (rc) {
1542                 pb_debug("%s: Invalid URL\n",__func__);
1543                 return NULL;
1544         }
1545
1546         switch (res->ai_family) {
1547         case AF_INET:   /* ipv4 */
1548                 ipaddr = talloc_array(ctx,char,INET_ADDRSTRLEN);
1549                 ipv4 = (struct sockaddr_in *) res->ai_addr;
1550                 inet_ntop(AF_INET, &(ipv4->sin_addr), ipaddr, INET_ADDRSTRLEN);
1551                 ipv6_route = false;
1552                 break;
1553         case AF_INET6:  /* ipv6 */
1554                 ipaddr = talloc_array(ctx,char,INET6_ADDRSTRLEN);
1555                 ipv6 = (struct sockaddr_in6 *) res->ai_addr;
1556                 inet_ntop(AF_INET6, &(ipv6->sin6_addr), ipaddr, INET6_ADDRSTRLEN);
1557                 ipv6_route = true;
1558                 break;
1559         default:        /* error */
1560                 freeaddrinfo(res);
1561                 return NULL;
1562         }
1563         freeaddrinfo(res);
1564
1565         const char *argv[] = {
1566                 pb_system_apps.ip,
1567                 ipv6_route ? "-6" : "-4",
1568                 "route", "show", "to", "match",
1569                 ipaddr,
1570                 NULL
1571         };
1572
1573         p = process_create(ctx);
1574
1575         p->path = pb_system_apps.ip;
1576         p->argv = argv;
1577         p->keep_stdout = true;
1578
1579         rc = process_run_sync(p);
1580
1581         if (rc || p->exit_status) {
1582                 /* ip has complained for some reason; most likely
1583                  * there is no route to the host - bail out */
1584                 pb_debug("%s: `ip` returns non-zero exit status\n", __func__);
1585                 pb_debug("ip buf: %s\n", p->stdout_buf);
1586                 process_release(p);
1587                 return NULL;
1588         }
1589
1590         buf = p->stdout_buf;
1591         /* If a route is found, ip-route output will be of the form
1592          * "... dev DEVNAME ... " */
1593         tok = strtok(buf, delim);
1594         while (tok) {
1595                 if (!strcmp(tok, "dev")) {
1596                         tok = strtok(NULL, delim);
1597                         dev = talloc_strdup(ctx, tok);
1598                         break;
1599                 }
1600                 tok = strtok(NULL, delim);
1601         }
1602
1603         process_release(p);
1604         if (dev)
1605                 pb_debug("%s: Found interface '%s'\n", __func__,dev);
1606         return dev;
1607 }
1608
1609 static void process_url_cb(struct load_url_result *result, void *data)
1610 {
1611         struct device_handler *handler;
1612         struct discover_context *ctx;
1613         struct discover_device *dev;
1614         struct event *event = data;
1615         const char *mac;
1616
1617         if (result->status != LOAD_OK) {
1618                 pb_log_fn("Load failed for %s\n", result->url->full);
1619                 return;
1620         }
1621
1622         if (!event)
1623                 return;
1624
1625         handler = talloc_parent(event);
1626         if (!handler)
1627                 return;
1628
1629         event->device = device_from_addr(event, result->url);
1630         if (!event->device) {
1631                 pb_log("Downloaded a file but can't find its interface - pretending it was local\n");
1632                 event->device = talloc_asprintf(event, "local");
1633         }
1634
1635         mac = event_get_param(event, "mac");
1636         char *url = talloc_asprintf(event, "file://%s", result->local);
1637         event_set_param(event, "pxeconffile-local", url);
1638
1639         dev = discover_device_create(handler, mac, event->device);
1640         ctx = device_handler_discover_context_create(handler, dev);
1641         talloc_steal(ctx, event);
1642         ctx->event = event;
1643
1644         iterate_parsers(ctx);
1645
1646         device_handler_discover_context_commit(handler, ctx);
1647
1648         talloc_unlink(handler, ctx);
1649 }
1650
1651 void device_handler_process_url(struct device_handler *handler,
1652                 const char *url, const char *mac, const char *ip)
1653 {
1654         struct discover_context *ctx;
1655         struct discover_device *dev;
1656         bool allow_async = false;
1657         struct pb_url *pb_url;
1658         struct event *event;
1659
1660         event = talloc_zero(handler, struct event);
1661         event->type = EVENT_TYPE_USER;
1662         event->action = EVENT_ACTION_URL;
1663
1664         pb_url = pb_url_parse(event, url);
1665         if (!pb_url || (pb_url->scheme != pb_url_file && !pb_url->host)) {
1666                 device_handler_status_err(handler, _("Invalid config URL!"));
1667                 talloc_free(event);
1668                 return;
1669         }
1670
1671         if (url[strlen(url) - 1] == '/') {
1672                 event_set_param(event, "pxepathprefix", url);
1673                 event_set_param(event, "mac", mac);
1674                 event_set_param(event, "ip", ip);
1675                 event->device = device_from_addr(event, pb_url);
1676                 if (!event->device) {
1677                         device_handler_status_err(handler,
1678                                         _("Unable to route to host %s"),
1679                                         pb_url->host);
1680                         talloc_free(event);
1681                         return;
1682                 }
1683         } else {
1684                 event_set_param(event, "pxeconffile", url);
1685                 allow_async = true;
1686         }
1687
1688         if (pb_url->scheme == pb_url_file)
1689                 event->device = talloc_asprintf(event, "local");
1690         else if (allow_async) {
1691                 /* If file is remote load asynchronously before passing to
1692                  * parser. This allows us to wait for network to be available */
1693                 if (!load_url_async(handler, pb_url, process_url_cb, event,
1694                                         NULL, handler)) {
1695                         pb_log("Failed to load url %s\n", pb_url->full);
1696                         device_handler_status_err(handler, _("Failed to load URL!"));
1697                         talloc_free(event);
1698                 }
1699                 return;
1700         }
1701
1702         /* If path is local we can parse straight away */
1703
1704         dev = discover_device_create(handler, mac, event->device);
1705         if (pb_url->scheme == pb_url_file)
1706                 dev->device->type = DEVICE_TYPE_ANY;
1707         ctx = device_handler_discover_context_create(handler, dev);
1708         talloc_steal(ctx, event);
1709         ctx->event = event;
1710
1711         iterate_parsers(ctx);
1712
1713         device_handler_discover_context_commit(handler, ctx);
1714
1715         talloc_unlink(handler, ctx);
1716 }
1717
1718 static void plugin_install_cb(struct process *process)
1719 {
1720         struct device_handler *handler = process->data;
1721
1722         if (!handler) {
1723                 pb_log_fn("Missing data!\n");
1724                 return;
1725         }
1726
1727         handler->plugin_installing = false;
1728         if (process->exit_status) {
1729                 device_handler_status_err(handler, "Plugin failed to install!");
1730                 pb_log("Failed to install plugin:\n%s\n", process->stdout_buf);
1731         }
1732 }
1733
1734 void device_handler_install_plugin(struct device_handler *handler,
1735                 const char *plugin_file)
1736 {
1737         struct process *p;
1738         int result;
1739
1740         if (handler->plugin_installing) {
1741                 pb_log("Plugin install cancelled - install already running");
1742                 return;
1743         }
1744
1745         p = process_create(handler);
1746         if (!p) {
1747                 pb_log("install_plugin: Failed to create process\n");
1748                 return;
1749         }
1750
1751         const char *argv[] = {
1752                 pb_system_apps.pb_plugin,
1753                 "install",
1754                 "auto",
1755                 plugin_file,
1756                 NULL
1757         };
1758
1759         p->path = pb_system_apps.pb_plugin;
1760         p->argv = argv;
1761         p->exit_cb = plugin_install_cb;
1762         p->data = handler;
1763         p->keep_stdout = true;
1764
1765         result = process_run_async(p);
1766
1767         if (result)
1768                 device_handler_status_err(handler, "Could not install plugin");
1769         else
1770                 handler->plugin_installing = true;
1771 }
1772
1773 #ifndef PETITBOOT_TEST
1774
1775 /**
1776  * context_commit - Commit a temporary discovery context to the handler,
1777  * and notify the clients about any new options / devices
1778  */
1779 void device_handler_discover_context_commit(struct device_handler *handler,
1780                 struct discover_context *ctx)
1781 {
1782         struct discover_device *dev = ctx->device;
1783         struct discover_boot_option *opt, *tmp;
1784
1785         if (!device_lookup_by_uuid(handler, dev->uuid))
1786                 device_handler_add_device(handler, dev);
1787
1788         /* move boot options from the context to the device */
1789         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
1790                 list_remove(&opt->list);
1791
1792                 /* All boot options need at least a kernel image */
1793                 if (!opt->boot_image || !opt->boot_image->url) {
1794                         pb_log("boot option %s is missing boot image, ignoring\n",
1795                                 opt->option->id);
1796                         talloc_free(opt);
1797                         continue;
1798                 }
1799
1800                 if (boot_option_resolve(opt, handler)) {
1801                         pb_log("boot option %s is resolved, "
1802                                         "sending to clients\n",
1803                                         opt->option->id);
1804                         list_add_tail(&dev->boot_options, &opt->list);
1805                         talloc_steal(dev, opt);
1806                         boot_option_finalise(handler, opt);
1807                         notify_boot_option(handler, opt);
1808                 } else {
1809                         if (!opt->source->resolve_resource) {
1810                                 pb_log("parser %s gave us an unresolved "
1811                                         "resource (%s), but no way to "
1812                                         "resolve it\n",
1813                                         opt->source->name, opt->option->id);
1814                                 talloc_free(opt);
1815                         } else {
1816                                 pb_log("boot option %s is unresolved, "
1817                                                 "adding to queue\n",
1818                                                 opt->option->id);
1819                                 list_add(&handler->unresolved_boot_options,
1820                                                 &opt->list);
1821                                 talloc_steal(handler, opt);
1822                         }
1823                 }
1824         }
1825 }
1826
1827 void device_handler_add_plugin_option(struct device_handler *handler,
1828                 struct plugin_option *opt)
1829 {
1830         struct plugin_option *tmp;
1831         unsigned int i;
1832
1833         for (i = 0; i < handler->n_plugins; i++) {
1834                 tmp = handler->plugins[i];
1835                 /* If both id and version match, ignore */
1836                 if (strncmp(opt->id, tmp->id, strlen(opt->id)) == 0 &&
1837                                 strcmp(opt->version, tmp->version) == 0) {
1838                         pb_log("discover: Plugin '%s' already exists, ignoring\n",
1839                                         opt->id);
1840                         return;
1841                 }
1842         }
1843
1844         handler->plugins = talloc_realloc(handler, handler->plugins,
1845                         struct plugin_option *, handler->n_plugins + 1);
1846         if (!handler->plugins) {
1847                 pb_log("Failed to allocate memory for new plugin\n");
1848                 handler->n_plugins = 0;
1849                 return;
1850         }
1851
1852         handler->plugins[handler->n_plugins++] = opt;
1853         discover_server_notify_plugin_option_add(handler->server, opt);
1854 }
1855
1856 static void device_handler_update_lang(const char *lang)
1857 {
1858         const char *cur_lang;
1859
1860         if (!lang)
1861                 return;
1862
1863         cur_lang = setlocale(LC_ALL, NULL);
1864         if (cur_lang && !strcmp(cur_lang, lang))
1865                 return;
1866
1867         setlocale(LC_ALL, lang);
1868 }
1869
1870 static int device_handler_init_sources(struct device_handler *handler)
1871 {
1872         /* init our device sources: udev, network and user events */
1873         handler->user_event = user_event_init(handler, handler->waitset);
1874         if (!handler->user_event)
1875                 return -1;
1876
1877         handler->network = network_init(handler, handler->waitset,
1878                         handler->dry_run);
1879         if (!handler->network)
1880                 return -1;
1881
1882         handler->udev = udev_init(handler, handler->waitset);
1883         if (!handler->udev)
1884                 return -1;
1885
1886         return 0;
1887 }
1888
1889 static void device_handler_reinit_sources(struct device_handler *handler)
1890 {
1891         /* if we haven't initialised sources previously (becuase we started in
1892          * safe mode), then init once here. */
1893         if (!(handler->udev || handler->network || handler->user_event)) {
1894                 device_handler_init_sources(handler);
1895                 return;
1896         }
1897
1898         system_info_reinit();
1899
1900         network_shutdown(handler->network);
1901         handler->network = network_init(handler, handler->waitset,
1902                         handler->dry_run);
1903
1904         udev_reinit(handler->udev);
1905 }
1906
1907 static inline const char *get_device_path(struct discover_device *dev)
1908 {
1909         return dev->ramdisk ? dev->ramdisk->snapshot : dev->device_path;
1910 }
1911
1912 static char *check_subvols(struct discover_device *dev)
1913 {
1914         const char *fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1915         struct stat sb;
1916         char *path;
1917         int rc;
1918
1919         if (strncmp(fstype, "btrfs", strlen("btrfs")))
1920                 return dev->mount_path;
1921
1922         /* On btrfs a device's root may be under a subvolume path */
1923         path = join_paths(dev, dev->mount_path, "@");
1924         rc = stat(path, &sb);
1925         if (!rc && S_ISDIR(sb.st_mode)) {
1926                 pb_debug("Using '%s' for btrfs root path\n", path);
1927                 return path;
1928         }
1929
1930         talloc_free(path);
1931         return dev->mount_path;
1932 }
1933
1934 static bool check_existing_mount(struct discover_device *dev)
1935 {
1936         struct stat devstat, mntstat;
1937         const char *device_path;
1938         struct mntent *mnt;
1939         FILE *fp;
1940         int rc;
1941
1942         device_path = get_device_path(dev);
1943
1944         rc = stat(device_path, &devstat);
1945         if (rc) {
1946                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
1947                 return false;
1948         }
1949
1950         if (!S_ISBLK(devstat.st_mode)) {
1951                 pb_debug("%s: %s isn't a block device?\n", __func__,
1952                                 dev->device_path);
1953                 return false;
1954         }
1955
1956         fp = fopen("/proc/self/mounts", "r");
1957
1958         for (;;) {
1959                 mnt = getmntent(fp);
1960                 if (!mnt)
1961                         break;
1962
1963                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
1964                         continue;
1965
1966                 rc = stat(mnt->mnt_fsname, &mntstat);
1967                 if (rc)
1968                         continue;
1969
1970                 if (!S_ISBLK(mntstat.st_mode))
1971                         continue;
1972
1973                 if (mntstat.st_rdev == devstat.st_rdev) {
1974                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
1975                         dev->root_path = check_subvols(dev);
1976                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
1977                         dev->mounted = true;
1978                         dev->unmount = false;
1979
1980                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
1981                                         __func__, dev->device_path,
1982                                         dev->mounted_rw ? 'w' : 'o',
1983                                         mnt->mnt_dir);
1984                         break;
1985                 }
1986         }
1987
1988         fclose(fp);
1989
1990         return mnt != NULL;
1991 }
1992
1993 /*
1994  * Attempt to mount a filesystem safely, while handling certain filesytem-
1995  * specific options
1996  */
1997 static int try_mount(const char *device_path, const char *mount_path,
1998                              const char *fstype, unsigned long flags,
1999                              bool have_snapshot)
2000 {
2001         const char *fs, *safe_opts;
2002         int rc;
2003
2004         /* Mount ext3 as ext4 instead so 'norecovery' can be used */
2005         if (strncmp(fstype, "ext3", strlen("ext3")) == 0) {
2006                 pb_debug("Mounting ext3 filesystem as ext4\n");
2007                 fs = "ext4";
2008         } else
2009                 fs = fstype;
2010
2011         if (strncmp(fs, "xfs", strlen("xfs")) == 0 ||
2012             strncmp(fs, "ext4", strlen("ext4")) == 0)
2013                 safe_opts = "norecovery";
2014         else
2015                 safe_opts = NULL;
2016
2017         errno = 0;
2018         /* If no snapshot is available don't attempt recovery */
2019         if (!have_snapshot)
2020                 return mount(device_path, mount_path, fs, flags, safe_opts);
2021
2022         rc = mount(device_path, mount_path, fs, flags, NULL);
2023
2024         if (!rc)
2025                 return rc;
2026
2027         /* Mounting failed; some filesystems will fail to mount if a recovery
2028          * journal exists (eg. cross-endian XFS), so try again with norecovery
2029          * where that option is available.
2030          * If mounting read-write just return the error as norecovery is not a
2031          * valid option */
2032         if ((flags & MS_RDONLY) != MS_RDONLY || !safe_opts)
2033                 return rc;
2034
2035         errno = 0;
2036         return mount(device_path, mount_path, fs, flags, safe_opts);
2037 }
2038
2039 static int mount_device(struct discover_device *dev)
2040 {
2041         const char *fstype, *device_path;
2042         int rc;
2043
2044         if (!dev->device_path)
2045                 return -1;
2046
2047         if (dev->mounted)
2048                 return 0;
2049
2050         if (check_existing_mount(dev))
2051                 return 0;
2052
2053         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
2054         if (!fstype)
2055                 return 0;
2056
2057         dev->mount_path = join_paths(dev, mount_base(),
2058                                         dev->device_path);
2059
2060         if (pb_mkdir_recursive(dev->mount_path)) {
2061                 pb_log("couldn't create mount directory %s: %s\n",
2062                                 dev->mount_path, strerror(errno));
2063                 goto err_free;
2064         }
2065
2066         device_path = get_device_path(dev);
2067
2068         pb_log("mounting device %s read-only\n", dev->device_path);
2069         rc = try_mount(device_path, dev->mount_path, fstype,
2070                        MS_RDONLY | MS_SILENT, dev->ramdisk);
2071
2072         /* If mount fails clean up any snapshot and try again */
2073         if (rc && dev->ramdisk) {
2074                 pb_log("couldn't mount snapshot for %s: mount failed: %s\n",
2075                                 device_path, strerror(errno));
2076                 pb_log("falling back to actual device\n");
2077
2078                 devmapper_destroy_snapshot(dev);
2079
2080                 device_path = get_device_path(dev);
2081                 pb_log("mounting device %s read-only\n", dev->device_path);
2082                 rc = try_mount(device_path, dev->mount_path, fstype,
2083                                MS_RDONLY | MS_SILENT, dev->ramdisk);
2084         }
2085
2086         if (!rc) {
2087                 dev->mounted = true;
2088                 dev->mounted_rw = false;
2089                 dev->unmount = true;
2090                 dev->root_path = check_subvols(dev);
2091                 return 0;
2092         }
2093
2094         pb_log("couldn't mount device %s: mount failed: %s\n",
2095                         device_path, strerror(errno));
2096
2097         pb_rmdir_recursive(mount_base(), dev->mount_path);
2098 err_free:
2099         talloc_free(dev->mount_path);
2100         dev->mount_path = NULL;
2101         return -1;
2102 }
2103
2104 static int umount_device(struct discover_device *dev)
2105 {
2106         const char *device_path;
2107         int rc;
2108
2109         if (!dev->mounted || !dev->unmount)
2110                 return 0;
2111
2112         device_path = get_device_path(dev);
2113
2114         pb_log("unmounting device %s\n", device_path);
2115         rc = umount(dev->mount_path);
2116         if (rc)
2117                 return -1;
2118
2119         dev->mounted = false;
2120         devmapper_destroy_snapshot(dev);
2121
2122         pb_rmdir_recursive(mount_base(), dev->mount_path);
2123
2124         talloc_free(dev->mount_path);
2125         dev->mount_path = NULL;
2126         dev->root_path = NULL;
2127
2128         return 0;
2129 }
2130
2131 int device_request_write(struct discover_device *dev, bool *release)
2132 {
2133         const char *fstype, *device_path;
2134         const struct config *config;
2135         int rc;
2136
2137         *release = false;
2138
2139         config = config_get();
2140         if (!config->allow_writes)
2141                 return -1;
2142
2143         if (!dev->mounted)
2144                 return -1;
2145
2146         if (dev->mounted_rw)
2147                 return 0;
2148
2149         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
2150
2151         device_path = get_device_path(dev);
2152
2153         pb_log("remounting device %s read-write\n", device_path);
2154
2155         rc = umount(dev->mount_path);
2156         if (rc) {
2157                 pb_log("Failed to unmount %s: %s\n",
2158                        dev->mount_path, strerror(errno));
2159                 return -1;
2160         }
2161
2162         rc = try_mount(device_path, dev->mount_path, fstype,
2163                        MS_SILENT, dev->ramdisk);
2164         if (rc)
2165                 goto mount_ro;
2166
2167         dev->mounted_rw = true;
2168         *release = true;
2169         return 0;
2170
2171 mount_ro:
2172         pb_log("Unable to remount device %s read-write: %s\n",
2173                device_path, strerror(errno));
2174         rc = try_mount(device_path, dev->mount_path, fstype,
2175                        MS_RDONLY | MS_SILENT, dev->ramdisk);
2176         if (rc)
2177                 pb_log("Unable to recover mount for %s: %s\n",
2178                        device_path, strerror(errno));
2179         return -1;
2180 }
2181
2182 void device_release_write(struct discover_device *dev, bool release)
2183 {
2184         const char *fstype, *device_path;
2185
2186         if (!release)
2187                 return;
2188
2189         device_path = get_device_path(dev);
2190
2191         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
2192
2193         pb_log("remounting device %s read-only\n", device_path);
2194
2195         if (umount(dev->mount_path)) {
2196                 pb_log("Failed to unmount %s\n", dev->mount_path);
2197                 return;
2198         }
2199         dev->mounted_rw = dev->mounted = false;
2200
2201         if (dev->ramdisk) {
2202                 devmapper_merge_snapshot(dev);
2203                 /* device_path becomes stale after merge */
2204                 device_path = get_device_path(dev);
2205         }
2206
2207         if (try_mount(device_path, dev->mount_path, fstype,
2208                        MS_RDONLY | MS_SILENT, dev->ramdisk))
2209                 pb_log("Failed to remount %s read-only: %s\n",
2210                        device_path, strerror(errno));
2211         else
2212                 dev->mounted = true;
2213 }
2214
2215 void device_sync_snapshots(struct device_handler *handler, const char *device)
2216 {
2217         struct discover_device *dev = NULL;
2218         unsigned int i;
2219
2220         if (device) {
2221                 /* Find matching device and sync */
2222                 dev = device_lookup_by_name(handler, device);
2223                 if (!dev) {
2224                         pb_log("%s: device name '%s' unrecognised\n",
2225                                 __func__, device);
2226                         return;
2227                 }
2228                 if (dev->ramdisk)
2229                         device_release_write(dev, true);
2230                 else
2231                         pb_log("%s has no snapshot to merge, skipping\n",
2232                                 dev->device->id);
2233                 return;
2234         }
2235
2236         /* Otherwise sync all relevant devices */
2237         for (i = 0; i < handler->n_devices; i++) {
2238                 dev = handler->devices[i];
2239                 if (dev->device->type != DEVICE_TYPE_DISK &&
2240                         dev->device->type != DEVICE_TYPE_USB)
2241                         continue;
2242                 if (dev->ramdisk)
2243                         device_release_write(dev, true);
2244                 else
2245                         pb_log("%s has no snapshot to merge, skipping\n",
2246                                 dev->device->id);
2247         }
2248 }
2249
2250 #else
2251
2252 void device_handler_discover_context_commit(
2253                 struct device_handler *handler __attribute__((unused)),
2254                 struct discover_context *ctx __attribute__((unused)))
2255 {
2256         pb_log_fn("stubbed out for test cases\n");
2257 }
2258
2259 static void device_handler_update_lang(const char *lang __attribute__((unused)))
2260 {
2261 }
2262
2263 static int device_handler_init_sources(
2264                 struct device_handler *handler __attribute__((unused)))
2265 {
2266         return 0;
2267 }
2268
2269 static void device_handler_reinit_sources(
2270                 struct device_handler *handler __attribute__((unused)))
2271 {
2272 }
2273
2274 static int umount_device(struct discover_device *dev __attribute__((unused)))
2275 {
2276         return 0;
2277 }
2278
2279 static int __attribute__((unused)) mount_device(
2280                 struct discover_device *dev __attribute__((unused)))
2281 {
2282         return 0;
2283 }
2284
2285 int device_request_write(struct discover_device *dev __attribute__((unused)),
2286                 bool *release)
2287 {
2288         *release = true;
2289         return 0;
2290 }
2291
2292 void device_release_write(struct discover_device *dev __attribute__((unused)),
2293         bool release __attribute__((unused)))
2294 {
2295 }
2296
2297 void device_sync_snapshots(
2298                 struct device_handler *handler __attribute__((unused)),
2299                 const char *device __attribute__((unused)))
2300 {
2301 }
2302
2303 #endif