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 <url/url.h>
  17
  18 #include "device-handler.h"
  19 #include "discover-server.h"
  20 #include "event.h"
  21 #include "parser.h"
  22 #include "resource.h"
  23 #include "udev.h"
  24 #include "paths.h"
  25 #include "boot.h"
  26
  27 struct device_handler {
  28         struct discover_server  *server;
  29         int                     dry_run;
  30
  31         struct discover_device  **devices;
  32         unsigned int            n_devices;
  33
  34         struct waitset          *waitset;
  35         struct waiter           *timeout_waiter;
  36         bool                    autoboot_enabled;
  37         unsigned int            sec_to_boot;
  38
  39         struct discover_boot_option *default_boot_option;
  40         struct list             unresolved_boot_options;
  41 };
  42
  43 void discover_context_add_boot_option(struct discover_context *ctx,
  44                 struct discover_boot_option *boot_option)
  45 {
  46         boot_option->source = ctx->parser;
  47         list_add_tail(&ctx->boot_options, &boot_option->list);
  48         talloc_steal(ctx, boot_option);
  49 }
  50
  51 /**
  52  * device_handler_get_device_count - Get the count of current handler devices.
  53  */
  54
  55 int device_handler_get_device_count(const struct device_handler *handler)
  56 {
  57         return handler->n_devices;
  58 }
  59
  60 /**
  61  * device_handler_get_device - Get a handler device by index.
  62  */
  63
  64 const struct discover_device *device_handler_get_device(
  65         const struct device_handler *handler, unsigned int index)
  66 {
  67         if (index >= handler->n_devices) {
  68                 assert(0 && "bad index");
  69                 return NULL;
  70         }
  71
  72         return handler->devices[index];
  73 }
  74
  75 struct discover_boot_option *discover_boot_option_create(
  76                 struct discover_context *ctx,
  77                 struct discover_device *device)
  78 {
  79         struct discover_boot_option *opt;
  80
  81         opt = talloc_zero(ctx, struct discover_boot_option);
  82         opt->option = talloc_zero(opt, struct boot_option);
  83         opt->device = device;
  84
  85         return opt;
  86 }
  87
  88 static int device_match_path(struct discover_device *dev, const char *path)
  89 {
  90         return dev->device_path && !strcmp(dev->device_path, path);
  91 }
  92
  93 static int device_match_uuid(struct discover_device *dev, const char *uuid)
  94 {
  95         return dev->uuid && !strcmp(dev->uuid, uuid);
  96 }
  97
  98 static int device_match_label(struct discover_device *dev, const char *label)
  99 {
 100         return dev->label && !strcmp(dev->label, label);
 101 }
 102
 103 static int device_match_id(struct discover_device *dev, const char *id)
 104 {
 105         return !strcmp(dev->device->id, id);
 106 }
 107
 108 static struct discover_device *device_lookup(
 109                 struct device_handler *device_handler,
 110                 int (match_fn)(struct discover_device *, const char *),
 111                 const char *str)
 112 {
 113         struct discover_device *dev;
 114         unsigned int i;
 115
 116         if (!str)
 117                 return NULL;
 118
 119         for (i = 0; i < device_handler->n_devices; i++) {
 120                 dev = device_handler->devices[i];
 121
 122                 if (match_fn(dev, str))
 123                         return dev;
 124         }
 125
 126         return NULL;
 127 }
 128
 129 struct discover_device *device_lookup_by_name(struct device_handler *handler,
 130                 const char *name)
 131 {
 132         struct discover_device *dev;
 133         char *path;
 134
 135         if (strncmp(name, "/dev/", strlen("/dev/")))
 136                 path = talloc_asprintf(NULL, "/dev/%s", name);
 137         else
 138                 path = talloc_strdup(NULL, name);
 139
 140         dev = device_lookup_by_path(handler, path);
 141
 142         talloc_free(path);
 143
 144         return dev;
 145 }
 146
 147 struct discover_device *device_lookup_by_path(
 148                 struct device_handler *device_handler,
 149                 const char *path)
 150 {
 151         return device_lookup(device_handler, device_match_path, path);
 152 }
 153
 154 struct discover_device *device_lookup_by_uuid(
 155                 struct device_handler *device_handler,
 156                 const char *uuid)
 157 {
 158         return device_lookup(device_handler, device_match_uuid, uuid);
 159 }
 160
 161 struct discover_device *device_lookup_by_label(
 162                 struct device_handler *device_handler,
 163                 const char *label)
 164 {
 165         return device_lookup(device_handler, device_match_label, label);
 166 }
 167
 168 struct discover_device *device_lookup_by_id(
 169                 struct device_handler *device_handler,
 170                 const char *id)
 171 {
 172         return device_lookup(device_handler, device_match_id, id);
 173 }
 174
 175 void device_handler_destroy(struct device_handler *handler)
 176 {
 177         talloc_free(handler);
 178 }
 179
 180 #ifdef PETITBOOT_TEST
 181
 182 /* we have a simplified interface for petitboot testing, but still want
 183  * to keep struct device_handler opaque. */
 184 struct device_handler *device_handler_init(
 185                 struct discover_server *server __attribute__((unused)),
 186                 struct waitset *waitset __attribute__((unused)),
 187                 int dry_run __attribute__((unused)))
 188 {
 189         struct device_handler *handler;
 190
 191         handler = talloc_zero(NULL, struct device_handler);
 192         list_init(&handler->unresolved_boot_options);
 193
 194         return handler;
 195 }
 196
 197 void device_handler_add_device(struct device_handler *handler,
 198                 struct discover_device *dev)
 199 {
 200         handler->n_devices++;
 201         handler->devices = talloc_realloc(handler, handler->devices,
 202                 struct discover_device *, handler->n_devices);
 203         handler->devices[handler->n_devices - 1] = dev;
 204 }
 205
 206 #else
 207
 208 static int mount_device(struct discover_device *dev)
 209 {
 210         const char *argv[6];
 211
 212         if (!dev->device_path)
 213                 return -1;
 214
 215         if (!dev->mount_path)
 216                 dev->mount_path = join_paths(dev, mount_base(),
 217                                                 dev->device_path);
 218
 219         if (pb_mkdir_recursive(dev->mount_path))
 220                 pb_log("couldn't create mount directory %s: %s\n",
 221                                 dev->mount_path, strerror(errno));
 222
 223         argv[0] = pb_system_apps.mount;
 224         argv[1] = dev->device_path;
 225         argv[2] = dev->mount_path;
 226         argv[3] = "-o";
 227         argv[4] = "ro";
 228         argv[5] = NULL;
 229
 230         if (pb_run_cmd(argv, 1, 0)) {
 231
 232                 /* Retry mount without ro option. */
 233
 234                 argv[0] = pb_system_apps.mount;
 235                 argv[1] = dev->device_path;
 236                 argv[2] = dev->mount_path;
 237                 argv[3] = NULL;
 238
 239                 if (pb_run_cmd(argv, 1, 0))
 240                         goto out_rmdir;
 241         }
 242
 243         return 0;
 244
 245 out_rmdir:
 246         pb_rmdir_recursive(mount_base(), dev->mount_path);
 247         return -1;
 248 }
 249
 250 static int umount_device(struct discover_device *dev)
 251 {
 252         int status;
 253         pid_t pid;
 254
 255         if (!dev->mount_path)
 256                 return 0;
 257
 258         pid = fork();
 259         if (pid == -1) {
 260                 pb_log("%s: fork failed: %s\n", __func__, strerror(errno));
 261                 return -1;
 262         }
 263
 264         if (pid == 0) {
 265                 execl(pb_system_apps.umount, pb_system_apps.umount,
 266                                                 dev->mount_path, NULL);
 267                 exit(EXIT_FAILURE);
 268         }
 269
 270         if (waitpid(pid, &status, 0) == -1) {
 271                 pb_log("%s: waitpid failed: %s\n", __func__,
 272                                 strerror(errno));
 273                 return -1;
 274         }
 275
 276         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 277                 return -1;
 278
 279         pb_rmdir_recursive(mount_base(), dev->mount_path);
 280
 281         return 0;
 282 }
 283
 284 struct device_handler *device_handler_init(struct discover_server *server,
 285                 struct waitset *waitset, int dry_run)
 286 {
 287         struct device_handler *handler;
 288
 289         handler = talloc(NULL, struct device_handler);
 290         handler->devices = NULL;
 291         handler->n_devices = 0;
 292         handler->server = server;
 293         handler->waitset = waitset;
 294         handler->dry_run = dry_run;
 295         handler->default_boot_option = NULL;
 296         handler->autoboot_enabled = config_get()->autoboot_enabled;
 297         list_init(&handler->unresolved_boot_options);
 298
 299         /* set up our mount point base */
 300         pb_mkdir_recursive(mount_base());
 301
 302         parser_init();
 303
 304         return handler;
 305 }
 306
 307 static int destroy_device(void *arg)
 308 {
 309         struct discover_device *dev = arg;
 310
 311         umount_device(dev);
 312
 313         return 0;
 314 }
 315
 316 static struct discover_device *find_device(struct device_handler *handler,
 317                 const char *id)
 318 {
 319         struct discover_device *dev;
 320         unsigned int i;
 321
 322         for (i = 0; i < handler->n_devices; i++) {
 323                 dev = handler->devices[i];
 324                 if (!strcmp(dev->device->id, id))
 325                         return dev;
 326         }
 327
 328         return NULL;
 329 }
 330
 331 static struct discover_device *discover_device_create(
 332                 struct device_handler *handler,
 333                 struct discover_context *ctx,
 334                 struct event *event)
 335 {
 336         struct discover_device *dev;
 337         const char *devname;
 338
 339         dev = find_device(handler, event->device);
 340         if (dev)
 341                 return dev;
 342
 343         dev = talloc_zero(ctx, struct discover_device);
 344         dev->device = talloc_zero(dev, struct device);
 345         list_init(&dev->boot_options);
 346
 347         devname = event_get_param(ctx->event, "DEVNAME");
 348         if (devname)
 349                 dev->device_path = talloc_strdup(dev, devname);
 350
 351         dev->device->id = talloc_strdup(dev, event->device);
 352
 353         talloc_set_destructor(dev, destroy_device);
 354
 355         return dev;
 356 }
 357
 358 /**
 359  * device_handler_remove - Remove a device from the handler device array.
 360  */
 361
 362 static void device_handler_remove(struct device_handler *handler,
 363         struct discover_device *device)
 364 {
 365         unsigned int i;
 366
 367         for (i = 0; i < handler->n_devices; i++)
 368                 if (handler->devices[i] == device)
 369                         break;
 370
 371         if (i == handler->n_devices) {
 372                 assert(0 && "unknown device");
 373                 return;
 374         }
 375
 376         handler->n_devices--;
 377         memmove(&handler->devices[i], &handler->devices[i + 1],
 378                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 379         handler->devices = talloc_realloc(handler, handler->devices,
 380                 struct discover_device *, handler->n_devices);
 381
 382         discover_server_notify_device_remove(handler->server, device->device);
 383
 384         talloc_free(device);
 385 }
 386
 387 static void boot_status(void *arg, struct boot_status *status)
 388 {
 389         struct device_handler *handler = arg;
 390
 391         discover_server_notify_boot_status(handler->server, status);
 392 }
 393
 394 static void countdown_status(struct device_handler *handler,
 395                 struct discover_boot_option *opt, unsigned int sec)
 396 {
 397         struct boot_status status;
 398
 399         status.type = BOOT_STATUS_INFO;
 400         status.progress = -1;
 401         status.detail = NULL;
 402         status.message = talloc_asprintf(handler,
 403                         "Booting %s in %u sec", opt->option->name, sec);
 404
 405         discover_server_notify_boot_status(handler->server, &status);
 406
 407         talloc_free(status.message);
 408 }
 409
 410 static int default_timeout(void *arg)
 411 {
 412         struct device_handler *handler = arg;
 413         struct discover_boot_option *opt;
 414
 415         if (!handler->default_boot_option)
 416                 return 0;
 417
 418         opt = handler->default_boot_option;
 419
 420         if (handler->sec_to_boot) {
 421                 countdown_status(handler, opt, handler->sec_to_boot);
 422                 handler->sec_to_boot--;
 423                 handler->timeout_waiter = waiter_register_timeout(
 424                                                 handler->waitset, 1000,
 425                                                 default_timeout, handler);
 426                 return 0;
 427         }
 428
 429         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 430
 431         boot(handler, handler->default_boot_option, NULL,
 432                         handler->dry_run, boot_status, handler);
 433         return 0;
 434 }
 435
 436 static void set_default(struct device_handler *handler,
 437                 struct discover_boot_option *opt)
 438 {
 439         if (handler->default_boot_option)
 440                 return;
 441
 442         if (!handler->autoboot_enabled)
 443                 return;
 444
 445         handler->default_boot_option = opt;
 446         handler->sec_to_boot = DEFAULT_BOOT_TIMEOUT_SEC;
 447
 448         pb_log("Boot option %s set as default, timeout %u sec.\n",
 449                opt->option->id, handler->sec_to_boot);
 450
 451         default_timeout(handler);
 452 }
 453
 454 static bool resource_is_resolved(struct resource *res)
 455 {
 456         return !res || res->resolved;
 457 }
 458
 459 /* We only use this in an assert, which will disappear if we're compiling
 460  * with NDEBUG, so we need the 'used' attribute for these builds */
 461 static bool __attribute__((used)) boot_option_is_resolved(
 462                 struct discover_boot_option *opt)
 463 {
 464         return resource_is_resolved(opt->boot_image) &&
 465                 resource_is_resolved(opt->initrd) &&
 466                 resource_is_resolved(opt->dtb) &&
 467                 resource_is_resolved(opt->icon);
 468 }
 469
 470 static bool resource_resolve(struct resource *res, const char *name,
 471                 struct discover_boot_option *opt,
 472                 struct device_handler *handler)
 473 {
 474         struct parser *parser = opt->source;
 475
 476         if (resource_is_resolved(res))
 477                 return true;
 478
 479         pb_log("Attempting to resolve resource %s->%s with parser %s\n",
 480                         opt->option->id, name, parser->name);
 481         parser->resolve_resource(handler, res);
 482
 483         return res->resolved;
 484 }
 485
 486 static bool boot_option_resolve(struct discover_boot_option *opt,
 487                 struct device_handler *handler)
 488 {
 489         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 490                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 491                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 492                 resource_resolve(opt->icon, "icon", opt, handler);
 493 }
 494
 495 static void boot_option_finalise(struct device_handler *handler,
 496                 struct discover_boot_option *opt)
 497 {
 498         assert(boot_option_is_resolved(opt));
 499
 500         /* check that the parsers haven't set any of the final data */
 501         assert(!opt->option->boot_image_file);
 502         assert(!opt->option->initrd_file);
 503         assert(!opt->option->dtb_file);
 504         assert(!opt->option->icon_file);
 505         assert(!opt->option->device_id);
 506
 507         if (opt->boot_image)
 508                 opt->option->boot_image_file = opt->boot_image->url->full;
 509         if (opt->initrd)
 510                 opt->option->initrd_file = opt->initrd->url->full;
 511         if (opt->dtb)
 512                 opt->option->dtb_file = opt->dtb->url->full;
 513         if (opt->icon)
 514                 opt->option->icon_file = opt->icon->url->full;
 515
 516         opt->option->device_id = opt->device->device->id;
 517
 518         if (opt->option->is_default)
 519                 set_default(handler, opt);
 520 }
 521
 522 static void process_boot_option_queue(struct device_handler *handler)
 523 {
 524         struct discover_boot_option *opt, *tmp;
 525
 526         list_for_each_entry_safe(&handler->unresolved_boot_options,
 527                         opt, tmp, list) {
 528
 529                 pb_log("queue: attempting resolution for %s\n",
 530                                 opt->option->id);
 531
 532                 if (!boot_option_resolve(opt, handler))
 533                         continue;
 534
 535                 pb_log("\tresolved!\n");
 536
 537                 list_remove(&opt->list);
 538                 list_add_tail(&opt->device->boot_options, &opt->list);
 539                 talloc_steal(opt->device, opt);
 540                 boot_option_finalise(handler, opt);
 541                 discover_server_notify_boot_option_add(handler->server,
 542                                                         opt->option);
 543         }
 544 }
 545
 546 /**
 547  * context_commit - Commit a temporary discovery context to the handler,
 548  * and notify the clients about any new options / devices
 549  */
 550 static void context_commit(struct device_handler *handler,
 551                 struct discover_context *ctx)
 552 {
 553         struct discover_device *dev = ctx->device;
 554         struct discover_boot_option *opt, *tmp;
 555         unsigned int i, existing_device = 0;
 556
 557         /* do we already have this device? */
 558         for (i = 0; i < handler->n_devices; i++) {
 559                 if (ctx->device == handler->devices[i]) {
 560                         existing_device = 1;
 561                         break;
 562                 }
 563         }
 564
 565         /* if not already present, add the device to the handler's array */
 566         if (!existing_device) {
 567                 handler->n_devices++;
 568                 handler->devices = talloc_realloc(handler, handler->devices,
 569                         struct discover_device *, handler->n_devices);
 570                 handler->devices[handler->n_devices - 1] = dev;
 571                 talloc_steal(handler, dev);
 572
 573                 discover_server_notify_device_add(handler->server, dev->device);
 574
 575                 /* this new device might be able to resolve existing boot
 576                  * options */
 577                 pb_log("New device %s, processing queue\n", dev->device->id);
 578                 process_boot_option_queue(handler);
 579         }
 580
 581
 582         /* move boot options from the context to the device */
 583         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
 584                 list_remove(&opt->list);
 585
 586                 if (boot_option_resolve(opt, handler)) {
 587                         pb_log("boot option %s is resolved, "
 588                                         "sending to clients\n",
 589                                         opt->option->id);
 590                         list_add_tail(&dev->boot_options, &opt->list);
 591                         talloc_steal(dev, opt);
 592                         boot_option_finalise(handler, opt);
 593                         discover_server_notify_boot_option_add(handler->server,
 594                                                                 opt->option);
 595                 } else {
 596                         if (!opt->source->resolve_resource) {
 597                                 pb_log("parser %s gave us an unresolved "
 598                                         "resource (%s), but no way to "
 599                                         "resolve it\n",
 600                                         opt->source->name, opt->option->id);
 601                                 talloc_free(opt);
 602                         } else {
 603                                 pb_log("boot option %s is unresolved, "
 604                                                 "adding to queue\n",
 605                                                 opt->option->id);
 606                                 list_add(&handler->unresolved_boot_options,
 607                                                 &opt->list);
 608                                 talloc_steal(handler, opt);
 609                         }
 610                 }
 611         }
 612 }
 613
 614 static int handle_add_udev_event(struct device_handler *handler,
 615                 struct event *event)
 616 {
 617         struct discover_context *ctx;
 618         struct discover_device *dev;
 619         const char *param;
 620         int rc;
 621
 622         /* create our context */
 623         ctx = talloc(handler, struct discover_context);
 624         ctx->event = event;
 625         list_init(&ctx->boot_options);
 626
 627         /* create our top-level device */
 628         dev = discover_device_create(handler, ctx, event);
 629
 630         ctx->device = dev;
 631
 632         /* try to parse UUID and labels */
 633         param = event_get_param(ctx->event, "ID_FS_UUID");
 634         if (param)
 635                 dev->uuid = talloc_strdup(dev, param);
 636
 637         param = event_get_param(ctx->event, "ID_FS_LABEL");
 638         if (param)
 639                 dev->label = talloc_strdup(dev, param);
 640
 641         rc = mount_device(dev);
 642         if (rc) {
 643                 talloc_free(ctx);
 644                 return 0;
 645         }
 646
 647         /* run the parsers. This will populate the ctx's boot_option list. */
 648         iterate_parsers(ctx, CONF_METHOD_LOCAL_FILE);
 649
 650         /* add discovered stuff to the handler */
 651         context_commit(handler, ctx);
 652
 653         talloc_free(ctx);
 654
 655         return 0;
 656 }
 657
 658 static int handle_remove_udev_event(struct device_handler *handler,
 659                 struct event *event)
 660 {
 661         struct discover_device *dev;
 662
 663         dev = find_device(handler, event->device);
 664         if (!dev)
 665                 return 0;
 666
 667         /* remove device from handler device array */
 668         device_handler_remove(handler, dev);
 669
 670         return 0;
 671 }
 672
 673 static int handle_add_user_event(struct device_handler *handler,
 674                 struct event *event)
 675 {
 676         struct discover_context *ctx;
 677         struct discover_device *dev;
 678         int rc;
 679
 680         assert(event->device);
 681
 682         ctx = talloc(handler, struct discover_context);
 683         ctx->event = event;
 684         list_init(&ctx->boot_options);
 685
 686         dev = discover_device_create(handler, ctx, event);
 687         ctx->device = dev;
 688
 689         rc = parse_user_event(ctx, event);
 690
 691         if (!rc)
 692                 context_commit(handler, ctx);
 693
 694         return rc;
 695 }
 696
 697 static int handle_remove_user_event(struct device_handler *handler,
 698                 struct event *event)
 699 {
 700         struct discover_device *dev = find_device(handler, event->device);
 701
 702         if (!dev)
 703                 return 0;
 704
 705         /* remove device from handler device array */
 706         device_handler_remove(handler, dev);
 707
 708         return 0;
 709 }
 710
 711 static enum conf_method parse_conf_method(const char *str)
 712 {
 713
 714         if (!strcasecmp(str, "dhcp")) {
 715                 return CONF_METHOD_DHCP;
 716         }
 717         return CONF_METHOD_UNKNOWN;
 718 }
 719
 720 static int handle_conf_user_event(struct device_handler *handler,
 721                 struct event *event)
 722 {
 723         struct discover_context *ctx;
 724         struct discover_device *dev;
 725         enum conf_method method;
 726         const char *val;
 727
 728         ctx = talloc(handler, struct discover_context);
 729         ctx->event = event;
 730         list_init(&ctx->boot_options);
 731
 732         val = event_get_param(event, "url");
 733         if (!val) {
 734                 talloc_free(ctx);
 735                 return 0;
 736         }
 737
 738         ctx->conf_url = pb_url_parse(ctx, val);
 739         if (!ctx->conf_url) {
 740                 talloc_free(ctx);
 741                 return 0;
 742         }
 743
 744         val = event_get_param(event, "method");
 745         if (!val) {
 746                 talloc_free(ctx);
 747                 return 0;
 748         }
 749
 750         method = parse_conf_method(val);
 751         if (method == CONF_METHOD_UNKNOWN) {
 752                 talloc_free(ctx);
 753                 return 0;
 754         }
 755
 756         dev = discover_device_create(handler, ctx, event);
 757         ctx->device = dev;
 758
 759         iterate_parsers(ctx, method);
 760
 761         context_commit(handler, ctx);
 762
 763         return 0;
 764 }
 765
 766 typedef int (*event_handler)(struct device_handler *, struct event *);
 767
 768 static event_handler handlers[EVENT_TYPE_MAX][EVENT_ACTION_MAX] = {
 769         [EVENT_TYPE_UDEV] = {
 770                 [EVENT_ACTION_ADD]      = handle_add_udev_event,
 771                 [EVENT_ACTION_REMOVE]   = handle_remove_udev_event,
 772         },
 773         [EVENT_TYPE_USER] = {
 774                 [EVENT_ACTION_ADD]      = handle_add_user_event,
 775                 [EVENT_ACTION_REMOVE]   = handle_remove_user_event,
 776                 [EVENT_ACTION_CONF]     = handle_conf_user_event,
 777         }
 778 };
 779
 780 int device_handler_event(struct device_handler *handler,
 781                 struct event *event)
 782 {
 783         if (event->type >= EVENT_TYPE_MAX ||
 784                         event->action >= EVENT_ACTION_MAX ||
 785                         !handlers[event->type][event->action]) {
 786                 pb_log("%s unknown type/action: %d/%d\n", __func__,
 787                                 event->type, event->action);
 788                 return 0;
 789         }
 790
 791         return handlers[event->type][event->action](handler, event);
 792 }
 793
 794 static struct discover_boot_option *find_boot_option_by_id(
 795                 struct device_handler *handler, const char *id)
 796 {
 797         unsigned int i;
 798
 799         for (i = 0; i < handler->n_devices; i++) {
 800                 struct discover_device *dev = handler->devices[i];
 801                 struct discover_boot_option *opt;
 802
 803                 list_for_each_entry(&dev->boot_options, opt, list)
 804                         if (!strcmp(opt->option->id, id))
 805                                 return opt;
 806         }
 807
 808         return NULL;
 809 }
 810
 811 void device_handler_boot(struct device_handler *handler,
 812                 struct boot_command *cmd)
 813 {
 814         struct discover_boot_option *opt;
 815
 816         opt = find_boot_option_by_id(handler, cmd->option_id);
 817
 818         boot(handler, opt, cmd, handler->dry_run, boot_status, handler);
 819 }
 820
 821 void device_handler_cancel_default(struct device_handler *handler)
 822 {
 823         struct boot_status status;
 824
 825         if (handler->timeout_waiter)
 826                 waiter_remove(handler->timeout_waiter);
 827
 828         handler->timeout_waiter = NULL;
 829         handler->autoboot_enabled = false;
 830
 831         /* we only send status if we had a default boot option queued */
 832         if (!handler->default_boot_option)
 833                 return;
 834
 835         pb_log("Cancelling default boot option\n");
 836
 837         handler->default_boot_option = NULL;
 838
 839         status.type = BOOT_STATUS_INFO;
 840         status.progress = -1;
 841         status.detail = NULL;
 842         status.message = "Default boot cancelled";
 843
 844         discover_server_notify_boot_status(handler->server, &status);
 845 }
 846 #endif