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

   1
   2 #include <assert.h>
   3 #include <stdlib.h>
   4 #include <unistd.h>
   5 #include <string.h>
   6 #include <errno.h>
   7 #include <sys/stat.h>
   8 #include <sys/wait.h>
   9
  10 #include <pb-config/pb-config.h>
  11 #include <talloc/talloc.h>
  12 #include <list/list.h>
  13 #include <log/log.h>
  14 #include <types/types.h>
  15 #include <system/system.h>
  16 #include <process/process.h>
  17 #include <url/url.h>
  18
  19 #include "device-handler.h"
  20 #include "discover-server.h"
  21 #include "event.h"
  22 #include "parser.h"
  23 #include "resource.h"
  24 #include "udev.h"
  25 #include "paths.h"
  26 #include "boot.h"
  27
  28 struct device_handler {
  29         struct discover_server  *server;
  30         int                     dry_run;
  31
  32         struct discover_device  **devices;
  33         unsigned int            n_devices;
  34
  35         struct waitset          *waitset;
  36         struct waiter           *timeout_waiter;
  37         bool                    autoboot_enabled;
  38         unsigned int            sec_to_boot;
  39
  40         struct discover_boot_option *default_boot_option;
  41         struct list             unresolved_boot_options;
  42 };
  43
  44 void discover_context_add_boot_option(struct discover_context *ctx,
  45                 struct discover_boot_option *boot_option)
  46 {
  47         boot_option->source = ctx->parser;
  48         list_add_tail(&ctx->boot_options, &boot_option->list);
  49         talloc_steal(ctx, boot_option);
  50 }
  51
  52 /**
  53  * device_handler_get_device_count - Get the count of current handler devices.
  54  */
  55
  56 int device_handler_get_device_count(const struct device_handler *handler)
  57 {
  58         return handler->n_devices;
  59 }
  60
  61 /**
  62  * device_handler_get_device - Get a handler device by index.
  63  */
  64
  65 const struct discover_device *device_handler_get_device(
  66         const struct device_handler *handler, unsigned int index)
  67 {
  68         if (index >= handler->n_devices) {
  69                 assert(0 && "bad index");
  70                 return NULL;
  71         }
  72
  73         return handler->devices[index];
  74 }
  75
  76 struct discover_boot_option *discover_boot_option_create(
  77                 struct discover_context *ctx,
  78                 struct discover_device *device)
  79 {
  80         struct discover_boot_option *opt;
  81
  82         opt = talloc_zero(ctx, struct discover_boot_option);
  83         opt->option = talloc_zero(opt, struct boot_option);
  84         opt->device = device;
  85
  86         return opt;
  87 }
  88
  89 static int device_match_path(struct discover_device *dev, const char *path)
  90 {
  91         return dev->device_path && !strcmp(dev->device_path, path);
  92 }
  93
  94 static int device_match_uuid(struct discover_device *dev, const char *uuid)
  95 {
  96         return dev->uuid && !strcmp(dev->uuid, uuid);
  97 }
  98
  99 static int device_match_label(struct discover_device *dev, const char *label)
 100 {
 101         return dev->label && !strcmp(dev->label, label);
 102 }
 103
 104 static int device_match_id(struct discover_device *dev, const char *id)
 105 {
 106         return !strcmp(dev->device->id, id);
 107 }
 108
 109 static struct discover_device *device_lookup(
 110                 struct device_handler *device_handler,
 111                 int (match_fn)(struct discover_device *, const char *),
 112                 const char *str)
 113 {
 114         struct discover_device *dev;
 115         unsigned int i;
 116
 117         if (!str)
 118                 return NULL;
 119
 120         for (i = 0; i < device_handler->n_devices; i++) {
 121                 dev = device_handler->devices[i];
 122
 123                 if (match_fn(dev, str))
 124                         return dev;
 125         }
 126
 127         return NULL;
 128 }
 129
 130 struct discover_device *device_lookup_by_name(struct device_handler *handler,
 131                 const char *name)
 132 {
 133         struct discover_device *dev;
 134         char *path;
 135
 136         if (strncmp(name, "/dev/", strlen("/dev/")))
 137                 path = talloc_asprintf(NULL, "/dev/%s", name);
 138         else
 139                 path = talloc_strdup(NULL, name);
 140
 141         dev = device_lookup_by_path(handler, path);
 142
 143         talloc_free(path);
 144
 145         return dev;
 146 }
 147
 148 struct discover_device *device_lookup_by_path(
 149                 struct device_handler *device_handler,
 150                 const char *path)
 151 {
 152         return device_lookup(device_handler, device_match_path, path);
 153 }
 154
 155 struct discover_device *device_lookup_by_uuid(
 156                 struct device_handler *device_handler,
 157                 const char *uuid)
 158 {
 159         return device_lookup(device_handler, device_match_uuid, uuid);
 160 }
 161
 162 struct discover_device *device_lookup_by_label(
 163                 struct device_handler *device_handler,
 164                 const char *label)
 165 {
 166         return device_lookup(device_handler, device_match_label, label);
 167 }
 168
 169 struct discover_device *device_lookup_by_id(
 170                 struct device_handler *device_handler,
 171                 const char *id)
 172 {
 173         return device_lookup(device_handler, device_match_id, id);
 174 }
 175
 176 void device_handler_destroy(struct device_handler *handler)
 177 {
 178         talloc_free(handler);
 179 }
 180
 181 #ifdef PETITBOOT_TEST
 182
 183 /* we have a simplified interface for petitboot testing, but still want
 184  * to keep struct device_handler opaque. */
 185 struct device_handler *device_handler_init(
 186                 struct discover_server *server __attribute__((unused)),
 187                 struct waitset *waitset __attribute__((unused)),
 188                 int dry_run __attribute__((unused)))
 189 {
 190         struct device_handler *handler;
 191
 192         handler = talloc_zero(NULL, struct device_handler);
 193         list_init(&handler->unresolved_boot_options);
 194
 195         return handler;
 196 }
 197
 198 void device_handler_add_device(struct device_handler *handler,
 199                 struct discover_device *dev)
 200 {
 201         handler->n_devices++;
 202         handler->devices = talloc_realloc(handler, handler->devices,
 203                 struct discover_device *, handler->n_devices);
 204         handler->devices[handler->n_devices - 1] = dev;
 205 }
 206
 207 #else
 208
 209 static int mount_device(struct discover_device *dev)
 210 {
 211         int rc;
 212
 213         if (!dev->device_path)
 214                 return -1;
 215
 216         if (!dev->mount_path)
 217                 dev->mount_path = join_paths(dev, mount_base(),
 218                                                 dev->device_path);
 219
 220         if (pb_mkdir_recursive(dev->mount_path))
 221                 pb_log("couldn't create mount directory %s: %s\n",
 222                                 dev->mount_path, strerror(errno));
 223
 224         rc = process_run_simple(dev, pb_system_apps.mount,
 225                         dev->device_path, dev->mount_path,
 226                         "-o", "ro", NULL);
 227
 228         if (!rc)
 229                 return 0;
 230
 231         /* Retry mount without ro option. */
 232         rc = process_run_simple(dev, pb_system_apps.mount,
 233                         dev->device_path, dev->mount_path, NULL);
 234
 235         if (!rc)
 236                 return 0;
 237
 238         pb_rmdir_recursive(mount_base(), dev->mount_path);
 239         return -1;
 240 }
 241
 242 static int umount_device(struct discover_device *dev)
 243 {
 244         int status;
 245
 246         if (!dev->mount_path)
 247                 return 0;
 248
 249         status = process_run_simple(dev, pb_system_apps.umount,
 250                         dev->mount_path, NULL);
 251
 252         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 253                 return -1;
 254
 255         pb_rmdir_recursive(mount_base(), dev->mount_path);
 256
 257         return 0;
 258 }
 259
 260 struct device_handler *device_handler_init(struct discover_server *server,
 261                 struct waitset *waitset, int dry_run)
 262 {
 263         struct device_handler *handler;
 264
 265         handler = talloc(NULL, struct device_handler);
 266         handler->devices = NULL;
 267         handler->n_devices = 0;
 268         handler->server = server;
 269         handler->waitset = waitset;
 270         handler->dry_run = dry_run;
 271         handler->default_boot_option = NULL;
 272         handler->autoboot_enabled = config_get()->autoboot_enabled;
 273         list_init(&handler->unresolved_boot_options);
 274
 275         /* set up our mount point base */
 276         pb_mkdir_recursive(mount_base());
 277
 278         parser_init();
 279
 280         return handler;
 281 }
 282
 283 static int destroy_device(void *arg)
 284 {
 285         struct discover_device *dev = arg;
 286
 287         umount_device(dev);
 288
 289         return 0;
 290 }
 291
 292 static struct discover_device *find_device(struct device_handler *handler,
 293                 const char *id)
 294 {
 295         struct discover_device *dev;
 296         unsigned int i;
 297
 298         for (i = 0; i < handler->n_devices; i++) {
 299                 dev = handler->devices[i];
 300                 if (!strcmp(dev->device->id, id))
 301                         return dev;
 302         }
 303
 304         return NULL;
 305 }
 306
 307 static struct discover_device *discover_device_create(
 308                 struct device_handler *handler,
 309                 struct discover_context *ctx,
 310                 struct event *event)
 311 {
 312         struct discover_device *dev;
 313         const char *devname;
 314
 315         dev = find_device(handler, event->device);
 316         if (dev)
 317                 return dev;
 318
 319         dev = talloc_zero(ctx, struct discover_device);
 320         dev->device = talloc_zero(dev, struct device);
 321         list_init(&dev->boot_options);
 322
 323         devname = event_get_param(ctx->event, "DEVNAME");
 324         if (devname)
 325                 dev->device_path = talloc_strdup(dev, devname);
 326
 327         dev->device->id = talloc_strdup(dev, event->device);
 328
 329         talloc_set_destructor(dev, destroy_device);
 330
 331         return dev;
 332 }
 333
 334 /**
 335  * device_handler_remove - Remove a device from the handler device array.
 336  */
 337
 338 static void device_handler_remove(struct device_handler *handler,
 339         struct discover_device *device)
 340 {
 341         unsigned int i;
 342
 343         for (i = 0; i < handler->n_devices; i++)
 344                 if (handler->devices[i] == device)
 345                         break;
 346
 347         if (i == handler->n_devices) {
 348                 assert(0 && "unknown device");
 349                 return;
 350         }
 351
 352         handler->n_devices--;
 353         memmove(&handler->devices[i], &handler->devices[i + 1],
 354                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 355         handler->devices = talloc_realloc(handler, handler->devices,
 356                 struct discover_device *, handler->n_devices);
 357
 358         discover_server_notify_device_remove(handler->server, device->device);
 359
 360         talloc_free(device);
 361 }
 362
 363 static void boot_status(void *arg, struct boot_status *status)
 364 {
 365         struct device_handler *handler = arg;
 366
 367         discover_server_notify_boot_status(handler->server, status);
 368 }
 369
 370 static void countdown_status(struct device_handler *handler,
 371                 struct discover_boot_option *opt, unsigned int sec)
 372 {
 373         struct boot_status status;
 374
 375         status.type = BOOT_STATUS_INFO;
 376         status.progress = -1;
 377         status.detail = NULL;
 378         status.message = talloc_asprintf(handler,
 379                         "Booting %s in %u sec", opt->option->name, sec);
 380
 381         discover_server_notify_boot_status(handler->server, &status);
 382
 383         talloc_free(status.message);
 384 }
 385
 386 static int default_timeout(void *arg)
 387 {
 388         struct device_handler *handler = arg;
 389         struct discover_boot_option *opt;
 390
 391         if (!handler->default_boot_option)
 392                 return 0;
 393
 394         opt = handler->default_boot_option;
 395
 396         if (handler->sec_to_boot) {
 397                 countdown_status(handler, opt, handler->sec_to_boot);
 398                 handler->sec_to_boot--;
 399                 handler->timeout_waiter = waiter_register_timeout(
 400                                                 handler->waitset, 1000,
 401                                                 default_timeout, handler);
 402                 return 0;
 403         }
 404
 405         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 406
 407         boot(handler, handler->default_boot_option, NULL,
 408                         handler->dry_run, boot_status, handler);
 409         return 0;
 410 }
 411
 412 static void set_default(struct device_handler *handler,
 413                 struct discover_boot_option *opt)
 414 {
 415         if (handler->default_boot_option)
 416                 return;
 417
 418         if (!handler->autoboot_enabled)
 419                 return;
 420
 421         handler->default_boot_option = opt;
 422         handler->sec_to_boot = DEFAULT_BOOT_TIMEOUT_SEC;
 423
 424         pb_log("Boot option %s set as default, timeout %u sec.\n",
 425                opt->option->id, handler->sec_to_boot);
 426
 427         default_timeout(handler);
 428 }
 429
 430 static bool resource_is_resolved(struct resource *res)
 431 {
 432         return !res || res->resolved;
 433 }
 434
 435 /* We only use this in an assert, which will disappear if we're compiling
 436  * with NDEBUG, so we need the 'used' attribute for these builds */
 437 static bool __attribute__((used)) boot_option_is_resolved(
 438                 struct discover_boot_option *opt)
 439 {
 440         return resource_is_resolved(opt->boot_image) &&
 441                 resource_is_resolved(opt->initrd) &&
 442                 resource_is_resolved(opt->dtb) &&
 443                 resource_is_resolved(opt->icon);
 444 }
 445
 446 static bool resource_resolve(struct resource *res, const char *name,
 447                 struct discover_boot_option *opt,
 448                 struct device_handler *handler)
 449 {
 450         struct parser *parser = opt->source;
 451
 452         if (resource_is_resolved(res))
 453                 return true;
 454
 455         pb_log("Attempting to resolve resource %s->%s with parser %s\n",
 456                         opt->option->id, name, parser->name);
 457         parser->resolve_resource(handler, res);
 458
 459         return res->resolved;
 460 }
 461
 462 static bool boot_option_resolve(struct discover_boot_option *opt,
 463                 struct device_handler *handler)
 464 {
 465         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 466                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 467                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 468                 resource_resolve(opt->icon, "icon", opt, handler);
 469 }
 470
 471 static void boot_option_finalise(struct device_handler *handler,
 472                 struct discover_boot_option *opt)
 473 {
 474         assert(boot_option_is_resolved(opt));
 475
 476         /* check that the parsers haven't set any of the final data */
 477         assert(!opt->option->boot_image_file);
 478         assert(!opt->option->initrd_file);
 479         assert(!opt->option->dtb_file);
 480         assert(!opt->option->icon_file);
 481         assert(!opt->option->device_id);
 482
 483         if (opt->boot_image)
 484                 opt->option->boot_image_file = opt->boot_image->url->full;
 485         if (opt->initrd)
 486                 opt->option->initrd_file = opt->initrd->url->full;
 487         if (opt->dtb)
 488                 opt->option->dtb_file = opt->dtb->url->full;
 489         if (opt->icon)
 490                 opt->option->icon_file = opt->icon->url->full;
 491
 492         opt->option->device_id = opt->device->device->id;
 493
 494         if (opt->option->is_default)
 495                 set_default(handler, opt);
 496 }
 497
 498 static void process_boot_option_queue(struct device_handler *handler)
 499 {
 500         struct discover_boot_option *opt, *tmp;
 501
 502         list_for_each_entry_safe(&handler->unresolved_boot_options,
 503                         opt, tmp, list) {
 504
 505                 pb_log("queue: attempting resolution for %s\n",
 506                                 opt->option->id);
 507
 508                 if (!boot_option_resolve(opt, handler))
 509                         continue;
 510
 511                 pb_log("\tresolved!\n");
 512
 513                 list_remove(&opt->list);
 514                 list_add_tail(&opt->device->boot_options, &opt->list);
 515                 talloc_steal(opt->device, opt);
 516                 boot_option_finalise(handler, opt);
 517                 discover_server_notify_boot_option_add(handler->server,
 518                                                         opt->option);
 519         }
 520 }
 521
 522 /**
 523  * context_commit - Commit a temporary discovery context to the handler,
 524  * and notify the clients about any new options / devices
 525  */
 526 static void context_commit(struct device_handler *handler,
 527                 struct discover_context *ctx)
 528 {
 529         struct discover_device *dev = ctx->device;
 530         struct discover_boot_option *opt, *tmp;
 531         unsigned int i, existing_device = 0;
 532
 533         /* do we already have this device? */
 534         for (i = 0; i < handler->n_devices; i++) {
 535                 if (ctx->device == handler->devices[i]) {
 536                         existing_device = 1;
 537                         break;
 538                 }
 539         }
 540
 541         /* if not already present, add the device to the handler's array */
 542         if (!existing_device) {
 543                 handler->n_devices++;
 544                 handler->devices = talloc_realloc(handler, handler->devices,
 545                         struct discover_device *, handler->n_devices);
 546                 handler->devices[handler->n_devices - 1] = dev;
 547                 talloc_steal(handler, dev);
 548
 549                 discover_server_notify_device_add(handler->server, dev->device);
 550
 551                 /* this new device might be able to resolve existing boot
 552                  * options */
 553                 pb_log("New device %s, processing queue\n", dev->device->id);
 554                 process_boot_option_queue(handler);
 555         }
 556
 557
 558         /* move boot options from the context to the device */
 559         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
 560                 list_remove(&opt->list);
 561
 562                 if (boot_option_resolve(opt, handler)) {
 563                         pb_log("boot option %s is resolved, "
 564                                         "sending to clients\n",
 565                                         opt->option->id);
 566                         list_add_tail(&dev->boot_options, &opt->list);
 567                         talloc_steal(dev, opt);
 568                         boot_option_finalise(handler, opt);
 569                         discover_server_notify_boot_option_add(handler->server,
 570                                                                 opt->option);
 571                 } else {
 572                         if (!opt->source->resolve_resource) {
 573                                 pb_log("parser %s gave us an unresolved "
 574                                         "resource (%s), but no way to "
 575                                         "resolve it\n",
 576                                         opt->source->name, opt->option->id);
 577                                 talloc_free(opt);
 578                         } else {
 579                                 pb_log("boot option %s is unresolved, "
 580                                                 "adding to queue\n",
 581                                                 opt->option->id);
 582                                 list_add(&handler->unresolved_boot_options,
 583                                                 &opt->list);
 584                                 talloc_steal(handler, opt);
 585                         }
 586                 }
 587         }
 588 }
 589
 590 static int handle_add_udev_event(struct device_handler *handler,
 591                 struct event *event)
 592 {
 593         struct discover_context *ctx;
 594         struct discover_device *dev;
 595         const char *param;
 596         int rc;
 597
 598         /* create our context */
 599         ctx = talloc(handler, struct discover_context);
 600         ctx->event = event;
 601         list_init(&ctx->boot_options);
 602
 603         /* create our top-level device */
 604         dev = discover_device_create(handler, ctx, event);
 605
 606         ctx->device = dev;
 607
 608         /* try to parse UUID and labels */
 609         param = event_get_param(ctx->event, "ID_FS_UUID");
 610         if (param)
 611                 dev->uuid = talloc_strdup(dev, param);
 612
 613         param = event_get_param(ctx->event, "ID_FS_LABEL");
 614         if (param)
 615                 dev->label = talloc_strdup(dev, param);
 616
 617         rc = mount_device(dev);
 618         if (rc) {
 619                 talloc_free(ctx);
 620                 return 0;
 621         }
 622
 623         /* run the parsers. This will populate the ctx's boot_option list. */
 624         iterate_parsers(ctx, CONF_METHOD_LOCAL_FILE);
 625
 626         /* add discovered stuff to the handler */
 627         context_commit(handler, ctx);
 628
 629         talloc_free(ctx);
 630
 631         return 0;
 632 }
 633
 634 static int handle_remove_udev_event(struct device_handler *handler,
 635                 struct event *event)
 636 {
 637         struct discover_device *dev;
 638
 639         dev = find_device(handler, event->device);
 640         if (!dev)
 641                 return 0;
 642
 643         /* remove device from handler device array */
 644         device_handler_remove(handler, dev);
 645
 646         return 0;
 647 }
 648
 649 static int handle_add_user_event(struct device_handler *handler,
 650                 struct event *event)
 651 {
 652         struct discover_context *ctx;
 653         struct discover_device *dev;
 654         int rc;
 655
 656         assert(event->device);
 657
 658         ctx = talloc(handler, struct discover_context);
 659         ctx->event = event;
 660         list_init(&ctx->boot_options);
 661
 662         dev = discover_device_create(handler, ctx, event);
 663         ctx->device = dev;
 664
 665         rc = parse_user_event(ctx, event);
 666
 667         if (!rc)
 668                 context_commit(handler, ctx);
 669
 670         return rc;
 671 }
 672
 673 static int handle_remove_user_event(struct device_handler *handler,
 674                 struct event *event)
 675 {
 676         struct discover_device *dev = find_device(handler, event->device);
 677
 678         if (!dev)
 679                 return 0;
 680
 681         /* remove device from handler device array */
 682         device_handler_remove(handler, dev);
 683
 684         return 0;
 685 }
 686
 687 static enum conf_method parse_conf_method(const char *str)
 688 {
 689
 690         if (!strcasecmp(str, "dhcp")) {
 691                 return CONF_METHOD_DHCP;
 692         }
 693         return CONF_METHOD_UNKNOWN;
 694 }
 695
 696 static int handle_conf_user_event(struct device_handler *handler,
 697                 struct event *event)
 698 {
 699         struct discover_context *ctx;
 700         struct discover_device *dev;
 701         enum conf_method method;
 702         const char *val;
 703
 704         ctx = talloc(handler, struct discover_context);
 705         ctx->event = event;
 706         list_init(&ctx->boot_options);
 707
 708         val = event_get_param(event, "url");
 709         if (!val) {
 710                 talloc_free(ctx);
 711                 return 0;
 712         }
 713
 714         ctx->conf_url = pb_url_parse(ctx, val);
 715         if (!ctx->conf_url) {
 716                 talloc_free(ctx);
 717                 return 0;
 718         }
 719
 720         val = event_get_param(event, "method");
 721         if (!val) {
 722                 talloc_free(ctx);
 723                 return 0;
 724         }
 725
 726         method = parse_conf_method(val);
 727         if (method == CONF_METHOD_UNKNOWN) {
 728                 talloc_free(ctx);
 729                 return 0;
 730         }
 731
 732         dev = discover_device_create(handler, ctx, event);
 733         ctx->device = dev;
 734
 735         iterate_parsers(ctx, method);
 736
 737         context_commit(handler, ctx);
 738
 739         return 0;
 740 }
 741
 742 typedef int (*event_handler)(struct device_handler *, struct event *);
 743
 744 static event_handler handlers[EVENT_TYPE_MAX][EVENT_ACTION_MAX] = {
 745         [EVENT_TYPE_UDEV] = {
 746                 [EVENT_ACTION_ADD]      = handle_add_udev_event,
 747                 [EVENT_ACTION_REMOVE]   = handle_remove_udev_event,
 748         },
 749         [EVENT_TYPE_USER] = {
 750                 [EVENT_ACTION_ADD]      = handle_add_user_event,
 751                 [EVENT_ACTION_REMOVE]   = handle_remove_user_event,
 752                 [EVENT_ACTION_CONF]     = handle_conf_user_event,
 753         }
 754 };
 755
 756 int device_handler_event(struct device_handler *handler,
 757                 struct event *event)
 758 {
 759         if (event->type >= EVENT_TYPE_MAX ||
 760                         event->action >= EVENT_ACTION_MAX ||
 761                         !handlers[event->type][event->action]) {
 762                 pb_log("%s unknown type/action: %d/%d\n", __func__,
 763                                 event->type, event->action);
 764                 return 0;
 765         }
 766
 767         return handlers[event->type][event->action](handler, event);
 768 }
 769
 770 static struct discover_boot_option *find_boot_option_by_id(
 771                 struct device_handler *handler, const char *id)
 772 {
 773         unsigned int i;
 774
 775         for (i = 0; i < handler->n_devices; i++) {
 776                 struct discover_device *dev = handler->devices[i];
 777                 struct discover_boot_option *opt;
 778
 779                 list_for_each_entry(&dev->boot_options, opt, list)
 780                         if (!strcmp(opt->option->id, id))
 781                                 return opt;
 782         }
 783
 784         return NULL;
 785 }
 786
 787 void device_handler_boot(struct device_handler *handler,
 788                 struct boot_command *cmd)
 789 {
 790         struct discover_boot_option *opt;
 791
 792         opt = find_boot_option_by_id(handler, cmd->option_id);
 793
 794         boot(handler, opt, cmd, handler->dry_run, boot_status, handler);
 795 }
 796
 797 void device_handler_cancel_default(struct device_handler *handler)
 798 {
 799         struct boot_status status;
 800
 801         if (handler->timeout_waiter)
 802                 waiter_remove(handler->timeout_waiter);
 803
 804         handler->timeout_waiter = NULL;
 805         handler->autoboot_enabled = false;
 806
 807         /* we only send status if we had a default boot option queued */
 808         if (!handler->default_boot_option)
 809                 return;
 810
 811         pb_log("Cancelling default boot option\n");
 812
 813         handler->default_boot_option = NULL;
 814
 815         status.type = BOOT_STATUS_INFO;
 816         status.progress = -1;
 817         status.detail = NULL;
 818         status.message = "Default boot cancelled";
 819
 820         discover_server_notify_boot_status(handler->server, &status);
 821 }
 822 #endif