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