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

   1 #include <assert.h>
   2 #include <stdlib.h>
   3 #include <stdbool.h>
   4 #include <unistd.h>
   5 #include <string.h>
   6 #include <errno.h>
   7 #include <mntent.h>
   8 #include <sys/stat.h>
   9 #include <sys/wait.h>
  10 #include <sys/mount.h>
  11
  12 #include <talloc/talloc.h>
  13 #include <list/list.h>
  14 #include <log/log.h>
  15 #include <types/types.h>
  16 #include <system/system.h>
  17 #include <process/process.h>
  18 #include <url/url.h>
  19
  20 #include "device-handler.h"
  21 #include "discover-server.h"
  22 #include "user-event.h"
  23 #include "platform.h"
  24 #include "event.h"
  25 #include "parser.h"
  26 #include "resource.h"
  27 #include "paths.h"
  28 #include "sysinfo.h"
  29 #include "boot.h"
  30 #include "udev.h"
  31 #include "network.h"
  32
  33 struct device_handler {
  34         struct discover_server  *server;
  35         int                     dry_run;
  36
  37         struct pb_udev          *udev;
  38         struct network          *network;
  39         struct user_event       *user_event;
  40
  41         struct discover_device  **devices;
  42         unsigned int            n_devices;
  43
  44         struct waitset          *waitset;
  45         struct waiter           *timeout_waiter;
  46         bool                    autoboot_enabled;
  47         unsigned int            sec_to_boot;
  48
  49         struct discover_boot_option *default_boot_option;
  50         struct list             unresolved_boot_options;
  51
  52         struct boot_task        *pending_boot;
  53         bool                    pending_boot_is_default;
  54 };
  55
  56 static int mount_device(struct discover_device *dev);
  57 static int umount_device(struct discover_device *dev);
  58
  59 static int device_handler_init_sources(struct device_handler *handler);
  60 static void device_handler_reinit_sources(struct device_handler *handler);
  61
  62 void discover_context_add_boot_option(struct discover_context *ctx,
  63                 struct discover_boot_option *boot_option)
  64 {
  65         boot_option->source = ctx->parser;
  66         list_add_tail(&ctx->boot_options, &boot_option->list);
  67         talloc_steal(ctx, boot_option);
  68 }
  69
  70 /**
  71  * device_handler_get_device_count - Get the count of current handler devices.
  72  */
  73
  74 int device_handler_get_device_count(const struct device_handler *handler)
  75 {
  76         return handler->n_devices;
  77 }
  78
  79 /**
  80  * device_handler_get_device - Get a handler device by index.
  81  */
  82
  83 const struct discover_device *device_handler_get_device(
  84         const struct device_handler *handler, unsigned int index)
  85 {
  86         if (index >= handler->n_devices) {
  87                 assert(0 && "bad index");
  88                 return NULL;
  89         }
  90
  91         return handler->devices[index];
  92 }
  93
  94 struct discover_boot_option *discover_boot_option_create(
  95                 struct discover_context *ctx,
  96                 struct discover_device *device)
  97 {
  98         struct discover_boot_option *opt;
  99
 100         opt = talloc_zero(ctx, struct discover_boot_option);
 101         opt->option = talloc_zero(opt, struct boot_option);
 102         opt->device = device;
 103
 104         return opt;
 105 }
 106
 107 static int device_match_uuid(struct discover_device *dev, const char *uuid)
 108 {
 109         return dev->uuid && !strcmp(dev->uuid, uuid);
 110 }
 111
 112 static int device_match_label(struct discover_device *dev, const char *label)
 113 {
 114         return dev->label && !strcmp(dev->label, label);
 115 }
 116
 117 static int device_match_id(struct discover_device *dev, const char *id)
 118 {
 119         return !strcmp(dev->device->id, id);
 120 }
 121
 122 static int device_match_serial(struct discover_device *dev, const char *serial)
 123 {
 124         const char *val = discover_device_get_param(dev, "ID_SERIAL");
 125         return val && !strcmp(val, serial);
 126 }
 127
 128 static struct discover_device *device_lookup(
 129                 struct device_handler *device_handler,
 130                 int (match_fn)(struct discover_device *, const char *),
 131                 const char *str)
 132 {
 133         struct discover_device *dev;
 134         unsigned int i;
 135
 136         if (!str)
 137                 return NULL;
 138
 139         for (i = 0; i < device_handler->n_devices; i++) {
 140                 dev = device_handler->devices[i];
 141
 142                 if (match_fn(dev, str))
 143                         return dev;
 144         }
 145
 146         return NULL;
 147 }
 148
 149 struct discover_device *device_lookup_by_name(struct device_handler *handler,
 150                 const char *name)
 151 {
 152         if (!strncmp(name, "/dev/", strlen("/dev/")))
 153                 name += strlen("/dev/");
 154
 155         return device_lookup_by_id(handler, name);
 156 }
 157
 158 struct discover_device *device_lookup_by_uuid(
 159                 struct device_handler *device_handler,
 160                 const char *uuid)
 161 {
 162         return device_lookup(device_handler, device_match_uuid, uuid);
 163 }
 164
 165 struct discover_device *device_lookup_by_label(
 166                 struct device_handler *device_handler,
 167                 const char *label)
 168 {
 169         return device_lookup(device_handler, device_match_label, label);
 170 }
 171
 172 struct discover_device *device_lookup_by_id(
 173                 struct device_handler *device_handler,
 174                 const char *id)
 175 {
 176         return device_lookup(device_handler, device_match_id, id);
 177 }
 178
 179 struct discover_device *device_lookup_by_serial(
 180                 struct device_handler *device_handler,
 181                 const char *serial)
 182 {
 183         return device_lookup(device_handler, device_match_serial, serial);
 184 }
 185
 186 void device_handler_destroy(struct device_handler *handler)
 187 {
 188         talloc_free(handler);
 189 }
 190
 191 static int destroy_device(void *arg)
 192 {
 193         struct discover_device *dev = arg;
 194
 195         umount_device(dev);
 196
 197         return 0;
 198 }
 199
 200 struct discover_device *discover_device_create(struct device_handler *handler,
 201                 const char *id)
 202 {
 203         struct discover_device *dev;
 204
 205         dev = device_lookup_by_id(handler, id);
 206         if (dev)
 207                 return dev;
 208
 209         dev = talloc_zero(handler, struct discover_device);
 210         dev->device = talloc_zero(dev, struct device);
 211         dev->device->id = talloc_strdup(dev->device, id);
 212         list_init(&dev->params);
 213         list_init(&dev->boot_options);
 214
 215         talloc_set_destructor(dev, destroy_device);
 216
 217         return dev;
 218 }
 219
 220 struct discover_device_param {
 221         char                    *name;
 222         char                    *value;
 223         struct list_item        list;
 224 };
 225
 226 void discover_device_set_param(struct discover_device *device,
 227                 const char *name, const char *value)
 228 {
 229         struct discover_device_param *param;
 230         bool found = false;
 231
 232         list_for_each_entry(&device->params, param, list) {
 233                 if (!strcmp(param->name, name)) {
 234                         found = true;
 235                         break;
 236                 }
 237         }
 238
 239         if (!found) {
 240                 if (!value)
 241                         return;
 242                 param = talloc(device, struct discover_device_param);
 243                 param->name = talloc_strdup(param, name);
 244                 list_add(&device->params, &param->list);
 245         } else {
 246                 if (!value) {
 247                         list_remove(&param->list);
 248                         talloc_free(param);
 249                         return;
 250                 }
 251                 talloc_free(param->value);
 252         }
 253
 254         param->value = talloc_strdup(param, value);
 255 }
 256
 257 const char *discover_device_get_param(struct discover_device *device,
 258                 const char *name)
 259 {
 260         struct discover_device_param *param;
 261
 262         list_for_each_entry(&device->params, param, list) {
 263                 if (!strcmp(param->name, name))
 264                         return param->value;
 265         }
 266         return NULL;
 267 }
 268
 269 struct device_handler *device_handler_init(struct discover_server *server,
 270                 struct waitset *waitset, int dry_run)
 271 {
 272         struct device_handler *handler;
 273         int rc;
 274
 275         handler = talloc_zero(NULL, struct device_handler);
 276         handler->server = server;
 277         handler->waitset = waitset;
 278         handler->dry_run = dry_run;
 279         handler->autoboot_enabled = config_get()->autoboot_enabled;
 280
 281         list_init(&handler->unresolved_boot_options);
 282
 283         /* set up our mount point base */
 284         pb_mkdir_recursive(mount_base());
 285
 286         parser_init();
 287
 288         rc = device_handler_init_sources(handler);
 289         if (rc) {
 290                 talloc_free(handler);
 291                 return NULL;
 292         }
 293
 294         return handler;
 295 }
 296
 297 void device_handler_reinit(struct device_handler *handler)
 298 {
 299         struct discover_boot_option *opt, *tmp;
 300         unsigned int i;
 301
 302         device_handler_cancel_default(handler);
 303
 304         /* free unresolved boot options */
 305         list_for_each_entry_safe(&handler->unresolved_boot_options,
 306                         opt, tmp, list)
 307                 talloc_free(opt);
 308         list_init(&handler->unresolved_boot_options);
 309
 310         /* drop all devices */
 311         for (i = 0; i < handler->n_devices; i++)
 312                 discover_server_notify_device_remove(handler->server,
 313                                 handler->devices[i]->device);
 314
 315         talloc_free(handler->devices);
 316         handler->devices = NULL;
 317         handler->n_devices = 0;
 318
 319         device_handler_reinit_sources(handler);
 320 }
 321
 322 void device_handler_remove(struct device_handler *handler,
 323                 struct discover_device *device)
 324 {
 325         struct discover_boot_option *opt, *tmp;
 326         unsigned int i;
 327
 328         for (i = 0; i < handler->n_devices; i++)
 329                 if (handler->devices[i] == device)
 330                         break;
 331
 332         if (i == handler->n_devices) {
 333                 talloc_free(device);
 334                 return;
 335         }
 336
 337         /* Free any unresolved options, as they're currently allocated
 338          * against the handler */
 339         list_for_each_entry_safe(&handler->unresolved_boot_options,
 340                         opt, tmp, list) {
 341                 if (opt->device != device)
 342                         continue;
 343                 list_remove(&opt->list);
 344                 talloc_free(opt);
 345         }
 346
 347         /* if this is a network device, we have to unregister it from the
 348          * network code */
 349         if (device->device->type == DEVICE_TYPE_NETWORK)
 350                 network_unregister_device(handler->network, device);
 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         if (device->notified)
 359                 discover_server_notify_device_remove(handler->server,
 360                                                         device->device);
 361
 362         talloc_free(device);
 363 }
 364
 365 static void boot_status(void *arg, struct boot_status *status)
 366 {
 367         struct device_handler *handler = arg;
 368
 369         discover_server_notify_boot_status(handler->server, status);
 370 }
 371
 372 static void countdown_status(struct device_handler *handler,
 373                 struct discover_boot_option *opt, unsigned int sec)
 374 {
 375         struct boot_status status;
 376
 377         status.type = BOOT_STATUS_INFO;
 378         status.progress = -1;
 379         status.detail = NULL;
 380         status.message = talloc_asprintf(handler,
 381                         "Booting in %d sec: %s", sec, opt->option->name);
 382
 383         discover_server_notify_boot_status(handler->server, &status);
 384
 385         talloc_free(status.message);
 386 }
 387
 388 static int default_timeout(void *arg)
 389 {
 390         struct device_handler *handler = arg;
 391         struct discover_boot_option *opt;
 392
 393         if (!handler->default_boot_option)
 394                 return 0;
 395
 396         if (handler->pending_boot)
 397                 return 0;
 398
 399         opt = handler->default_boot_option;
 400
 401         if (handler->sec_to_boot) {
 402                 countdown_status(handler, opt, handler->sec_to_boot);
 403                 handler->sec_to_boot--;
 404                 handler->timeout_waiter = waiter_register_timeout(
 405                                                 handler->waitset, 1000,
 406                                                 default_timeout, handler);
 407                 return 0;
 408         }
 409
 410         handler->timeout_waiter = NULL;
 411
 412         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 413
 414         handler->pending_boot = boot(handler, handler->default_boot_option,
 415                         NULL, handler->dry_run, boot_status, handler);
 416         handler->pending_boot_is_default = true;
 417         return 0;
 418 }
 419
 420 static bool priority_match(struct boot_priority *prio,
 421                 struct discover_boot_option *opt)
 422 {
 423         return prio->type == opt->device->device->type ||
 424                 prio->type == DEVICE_TYPE_ANY;
 425 }
 426
 427 static int default_option_priority(struct discover_boot_option *opt)
 428 {
 429         const struct config *config;
 430         struct boot_priority *prio;
 431         unsigned int i;
 432
 433         config = config_get();
 434
 435         for (i = 0; i < config->n_boot_priorities; i++) {
 436                 prio = &config->boot_priorities[i];
 437                 if (priority_match(prio, opt))
 438                         return prio->priority;
 439         }
 440
 441         return 0;
 442 }
 443
 444 static bool device_allows_default(struct discover_device *dev)
 445 {
 446         const char *dev_str;
 447
 448         dev_str = config_get()->boot_device;
 449
 450         if (!dev_str || !strlen(dev_str))
 451                 return true;
 452
 453         /* default devices are specified by UUIDs at present */
 454         if (strcmp(dev->uuid, dev_str))
 455                 return false;
 456
 457         return true;
 458 }
 459
 460 static void set_default(struct device_handler *handler,
 461                 struct discover_boot_option *opt)
 462 {
 463         int new_prio;
 464
 465         if (!handler->autoboot_enabled)
 466                 return;
 467
 468         /* do we allow default-booting from this device? */
 469         if (!device_allows_default(opt->device))
 470                 return;
 471
 472         new_prio = default_option_priority(opt);
 473
 474         /* A negative priority indicates that we don't want to boot this device
 475          * by default */
 476         if (new_prio < 0)
 477                 return;
 478
 479         /* Resolve any conflicts: if we have a new default option, it only
 480          * replaces the current if it has a higher priority. */
 481         if (handler->default_boot_option) {
 482                 int cur_prio;
 483
 484                 cur_prio = default_option_priority(
 485                                         handler->default_boot_option);
 486
 487                 if (new_prio > cur_prio) {
 488                         handler->default_boot_option = opt;
 489                         /* extend the timeout a little, so the user sees some
 490                          * indication of the change */
 491                         handler->sec_to_boot += 2;
 492                 }
 493
 494                 return;
 495         }
 496
 497         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 498         handler->default_boot_option = opt;
 499
 500         pb_log("Boot option %s set as default, timeout %u sec.\n",
 501                opt->option->id, handler->sec_to_boot);
 502
 503         default_timeout(handler);
 504 }
 505
 506 static bool resource_is_resolved(struct resource *res)
 507 {
 508         return !res || res->resolved;
 509 }
 510
 511 /* We only use this in an assert, which will disappear if we're compiling
 512  * with NDEBUG, so we need the 'used' attribute for these builds */
 513 static bool __attribute__((used)) boot_option_is_resolved(
 514                 struct discover_boot_option *opt)
 515 {
 516         return resource_is_resolved(opt->boot_image) &&
 517                 resource_is_resolved(opt->initrd) &&
 518                 resource_is_resolved(opt->dtb) &&
 519                 resource_is_resolved(opt->icon);
 520 }
 521
 522 static bool resource_resolve(struct resource *res, const char *name,
 523                 struct discover_boot_option *opt,
 524                 struct device_handler *handler)
 525 {
 526         struct parser *parser = opt->source;
 527
 528         if (resource_is_resolved(res))
 529                 return true;
 530
 531         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
 532                         opt->option->id, name, parser->name);
 533         parser->resolve_resource(handler, res);
 534
 535         return res->resolved;
 536 }
 537
 538 static bool boot_option_resolve(struct discover_boot_option *opt,
 539                 struct device_handler *handler)
 540 {
 541         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 542                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 543                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 544                 resource_resolve(opt->icon, "icon", opt, handler);
 545 }
 546
 547 static void boot_option_finalise(struct device_handler *handler,
 548                 struct discover_boot_option *opt)
 549 {
 550         assert(boot_option_is_resolved(opt));
 551
 552         /* check that the parsers haven't set any of the final data */
 553         assert(!opt->option->boot_image_file);
 554         assert(!opt->option->initrd_file);
 555         assert(!opt->option->dtb_file);
 556         assert(!opt->option->icon_file);
 557         assert(!opt->option->device_id);
 558
 559         if (opt->boot_image)
 560                 opt->option->boot_image_file = opt->boot_image->url->full;
 561         if (opt->initrd)
 562                 opt->option->initrd_file = opt->initrd->url->full;
 563         if (opt->dtb)
 564                 opt->option->dtb_file = opt->dtb->url->full;
 565         if (opt->icon)
 566                 opt->option->icon_file = opt->icon->url->full;
 567
 568         opt->option->device_id = opt->device->device->id;
 569
 570         if (opt->option->is_default)
 571                 set_default(handler, opt);
 572 }
 573
 574 static void notify_boot_option(struct device_handler *handler,
 575                 struct discover_boot_option *opt)
 576 {
 577         struct discover_device *dev = opt->device;
 578
 579         if (!dev->notified)
 580                 discover_server_notify_device_add(handler->server,
 581                                                   opt->device->device);
 582         dev->notified = true;
 583         discover_server_notify_boot_option_add(handler->server, opt->option);
 584 }
 585
 586 static void process_boot_option_queue(struct device_handler *handler)
 587 {
 588         struct discover_boot_option *opt, *tmp;
 589
 590         list_for_each_entry_safe(&handler->unresolved_boot_options,
 591                         opt, tmp, list) {
 592
 593                 pb_debug("queue: attempting resolution for %s\n",
 594                                 opt->option->id);
 595
 596                 if (!boot_option_resolve(opt, handler))
 597                         continue;
 598
 599                 pb_debug("\tresolved!\n");
 600
 601                 list_remove(&opt->list);
 602                 list_add_tail(&opt->device->boot_options, &opt->list);
 603                 talloc_steal(opt->device, opt);
 604                 boot_option_finalise(handler, opt);
 605                 notify_boot_option(handler, opt);
 606         }
 607 }
 608
 609 struct discover_context *device_handler_discover_context_create(
 610                 struct device_handler *handler,
 611                 struct discover_device *device)
 612 {
 613         struct discover_context *ctx;
 614
 615         ctx = talloc_zero(handler, struct discover_context);
 616         ctx->device = device;
 617         list_init(&ctx->boot_options);
 618
 619         return ctx;
 620 }
 621
 622 /**
 623  * context_commit - Commit a temporary discovery context to the handler,
 624  * and notify the clients about any new options / devices
 625  */
 626 void device_handler_discover_context_commit(struct device_handler *handler,
 627                 struct discover_context *ctx)
 628 {
 629         struct discover_device *dev = ctx->device;
 630         struct discover_boot_option *opt, *tmp;
 631
 632         if (!device_lookup_by_id(handler, dev->device->id))
 633                 device_handler_add_device(handler, dev);
 634
 635         /* move boot options from the context to the device */
 636         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
 637                 list_remove(&opt->list);
 638
 639                 if (boot_option_resolve(opt, handler)) {
 640                         pb_log("boot option %s is resolved, "
 641                                         "sending to clients\n",
 642                                         opt->option->id);
 643                         list_add_tail(&dev->boot_options, &opt->list);
 644                         talloc_steal(dev, opt);
 645                         boot_option_finalise(handler, opt);
 646                         notify_boot_option(handler, opt);
 647                 } else {
 648                         if (!opt->source->resolve_resource) {
 649                                 pb_log("parser %s gave us an unresolved "
 650                                         "resource (%s), but no way to "
 651                                         "resolve it\n",
 652                                         opt->source->name, opt->option->id);
 653                                 talloc_free(opt);
 654                         } else {
 655                                 pb_log("boot option %s is unresolved, "
 656                                                 "adding to queue\n",
 657                                                 opt->option->id);
 658                                 list_add(&handler->unresolved_boot_options,
 659                                                 &opt->list);
 660                                 talloc_steal(handler, opt);
 661                         }
 662                 }
 663         }
 664 }
 665
 666 void device_handler_add_device(struct device_handler *handler,
 667                 struct discover_device *device)
 668 {
 669         handler->n_devices++;
 670         handler->devices = talloc_realloc(handler, handler->devices,
 671                                 struct discover_device *, handler->n_devices);
 672         handler->devices[handler->n_devices - 1] = device;
 673
 674         if (device->device->type == DEVICE_TYPE_NETWORK)
 675                 network_register_device(handler->network, device);
 676 }
 677
 678 /* Start discovery on a hotplugged device. The device will be in our devices
 679  * array, but has only just been initialised by the hotplug source.
 680  */
 681 int device_handler_discover(struct device_handler *handler,
 682                 struct discover_device *dev)
 683 {
 684         struct discover_context *ctx;
 685         int rc;
 686
 687         process_boot_option_queue(handler);
 688
 689         /* create our context */
 690         ctx = device_handler_discover_context_create(handler, dev);
 691
 692         rc = mount_device(dev);
 693         if (rc)
 694                 goto out;
 695
 696         /* add this device to our system info */
 697         system_info_register_blockdev(dev->device->id, dev->uuid,
 698                         dev->mount_path);
 699
 700         /* run the parsers. This will populate the ctx's boot_option list. */
 701         iterate_parsers(ctx);
 702
 703         /* add discovered stuff to the handler */
 704         device_handler_discover_context_commit(handler, ctx);
 705
 706 out:
 707         talloc_free(ctx);
 708
 709         return 0;
 710 }
 711
 712 /* Incoming dhcp event */
 713 int device_handler_dhcp(struct device_handler *handler,
 714                 struct discover_device *dev, struct event *event)
 715 {
 716         struct discover_context *ctx;
 717
 718         /* create our context */
 719         ctx = device_handler_discover_context_create(handler, dev);
 720         ctx->event = event;
 721
 722         iterate_parsers(ctx);
 723
 724         device_handler_discover_context_commit(handler, ctx);
 725
 726         talloc_free(ctx);
 727
 728         return 0;
 729 }
 730
 731 /* incoming conf event */
 732 int device_handler_conf(struct device_handler *handler,
 733                 struct discover_device *dev, struct pb_url *url)
 734 {
 735         struct discover_context *ctx;
 736
 737         /* create our context */
 738         ctx = device_handler_discover_context_create(handler, dev);
 739         ctx->conf_url = url;
 740
 741         iterate_parsers(ctx);
 742
 743         device_handler_discover_context_commit(handler, ctx);
 744
 745         talloc_free(ctx);
 746
 747         return 0;
 748 }
 749
 750 static struct discover_boot_option *find_boot_option_by_id(
 751                 struct device_handler *handler, const char *id)
 752 {
 753         unsigned int i;
 754
 755         for (i = 0; i < handler->n_devices; i++) {
 756                 struct discover_device *dev = handler->devices[i];
 757                 struct discover_boot_option *opt;
 758
 759                 list_for_each_entry(&dev->boot_options, opt, list)
 760                         if (!strcmp(opt->option->id, id))
 761                                 return opt;
 762         }
 763
 764         return NULL;
 765 }
 766
 767 void device_handler_boot(struct device_handler *handler,
 768                 struct boot_command *cmd)
 769 {
 770         struct discover_boot_option *opt = NULL;
 771
 772         if (cmd->option_id && strlen(cmd->option_id))
 773                 opt = find_boot_option_by_id(handler, cmd->option_id);
 774
 775         if (handler->pending_boot)
 776                 boot_cancel(handler->pending_boot);
 777         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
 778                         boot_status, handler);
 779         handler->pending_boot_is_default = false;
 780 }
 781
 782 void device_handler_cancel_default(struct device_handler *handler)
 783 {
 784         struct boot_status status;
 785
 786         if (handler->timeout_waiter)
 787                 waiter_remove(handler->timeout_waiter);
 788
 789         handler->timeout_waiter = NULL;
 790         handler->autoboot_enabled = false;
 791
 792         /* we only send status if we had a default boot option queued */
 793         if (!handler->default_boot_option)
 794                 return;
 795
 796         pb_log("Cancelling default boot option\n");
 797
 798         if (handler->pending_boot && handler->pending_boot_is_default) {
 799                 boot_cancel(handler->pending_boot);
 800                 handler->pending_boot = NULL;
 801                 handler->pending_boot_is_default = false;
 802         }
 803
 804         handler->default_boot_option = NULL;
 805
 806         status.type = BOOT_STATUS_INFO;
 807         status.progress = -1;
 808         status.detail = NULL;
 809         status.message = "Default boot cancelled";
 810
 811         discover_server_notify_boot_status(handler->server, &status);
 812 }
 813
 814 void device_handler_update_config(struct device_handler *handler,
 815                 struct config *config)
 816 {
 817         config_set(config);
 818         discover_server_notify_config(handler->server, config);
 819         device_handler_reinit(handler);
 820 }
 821
 822 #ifndef PETITBOOT_TEST
 823
 824 static int device_handler_init_sources(struct device_handler *handler)
 825 {
 826         /* init our device sources: udev, network and user events */
 827         handler->udev = udev_init(handler, handler->waitset);
 828         if (!handler->udev)
 829                 return -1;
 830
 831         handler->network = network_init(handler, handler->waitset,
 832                         handler->dry_run);
 833         if (!handler->network)
 834                 return -1;
 835
 836         handler->user_event = user_event_init(handler, handler->waitset);
 837         if (!handler->user_event)
 838                 return -1;
 839
 840         return 0;
 841 }
 842
 843 static void device_handler_reinit_sources(struct device_handler *handler)
 844 {
 845         udev_reinit(handler->udev);
 846
 847         network_shutdown(handler->network);
 848         handler->network = network_init(handler, handler->waitset,
 849                         handler->dry_run);
 850 }
 851
 852 static bool check_existing_mount(struct discover_device *dev)
 853 {
 854         struct stat devstat, mntstat;
 855         struct mntent *mnt;
 856         FILE *fp;
 857         int rc;
 858
 859         rc = stat(dev->device_path, &devstat);
 860         if (rc) {
 861                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
 862                 return false;
 863         }
 864
 865         if (!S_ISBLK(devstat.st_mode)) {
 866                 pb_debug("%s: %s isn't a block device?\n", __func__,
 867                                 dev->device_path);
 868                 return false;
 869         }
 870
 871         fp = fopen("/proc/self/mounts", "r");
 872
 873         for (;;) {
 874                 mnt = getmntent(fp);
 875                 if (!mnt)
 876                         break;
 877
 878                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
 879                         continue;
 880
 881                 rc = stat(mnt->mnt_fsname, &mntstat);
 882                 if (rc)
 883                         continue;
 884
 885                 if (!S_ISBLK(mntstat.st_mode))
 886                         continue;
 887
 888                 if (mntstat.st_rdev == devstat.st_rdev) {
 889                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
 890                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
 891                         dev->mounted = true;
 892                         dev->unmount = false;
 893
 894                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
 895                                         __func__, dev->device_path,
 896                                         dev->mounted_rw ? 'w' : 'o',
 897                                         mnt->mnt_dir);
 898                         break;
 899                 }
 900         }
 901
 902         fclose(fp);
 903
 904         return mnt != NULL;
 905 }
 906
 907 static int mount_device(struct discover_device *dev)
 908 {
 909         const char *fstype;
 910         int rc;
 911
 912         if (!dev->device_path)
 913                 return -1;
 914
 915         if (dev->mounted)
 916                 return 0;
 917
 918         if (check_existing_mount(dev))
 919                 return 0;
 920
 921         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
 922         if (!fstype)
 923                 return 0;
 924
 925         dev->mount_path = join_paths(dev, mount_base(),
 926                                         dev->device_path);
 927
 928         if (pb_mkdir_recursive(dev->mount_path)) {
 929                 pb_log("couldn't create mount directory %s: %s\n",
 930                                 dev->mount_path, strerror(errno));
 931                 goto err_free;
 932         }
 933
 934         pb_log("mounting device %s read-only\n", dev->device_path);
 935         errno = 0;
 936         rc = mount(dev->device_path, dev->mount_path, fstype,
 937                         MS_RDONLY | MS_SILENT, "");
 938         if (!rc) {
 939                 dev->mounted = true;
 940                 dev->mounted_rw = false;
 941                 dev->unmount = true;
 942                 return 0;
 943         }
 944
 945         pb_log("couldn't mount device %s: mount failed: %s\n",
 946                         dev->device_path, strerror(errno));
 947
 948         pb_rmdir_recursive(mount_base(), dev->mount_path);
 949 err_free:
 950         talloc_free(dev->mount_path);
 951         dev->mount_path = NULL;
 952         return -1;
 953 }
 954
 955 static int umount_device(struct discover_device *dev)
 956 {
 957         int rc;
 958
 959         if (!dev->mounted || !dev->unmount)
 960                 return 0;
 961
 962         pb_log("unmounting device %s\n", dev->device_path);
 963         rc = umount(dev->mount_path);
 964         if (rc)
 965                 return -1;
 966
 967         dev->mounted = false;
 968
 969         pb_rmdir_recursive(mount_base(), dev->mount_path);
 970
 971         talloc_free(dev->mount_path);
 972         dev->mount_path = NULL;
 973
 974         return 0;
 975 }
 976
 977 int device_request_write(struct discover_device *dev, bool *release)
 978 {
 979         int rc;
 980
 981         *release = false;
 982
 983         if (!dev->mounted)
 984                 return -1;
 985
 986         if (dev->mounted_rw)
 987                 return 0;
 988
 989         pb_log("remounting device %s read-write\n", dev->device_path);
 990         rc = mount(dev->device_path, dev->mount_path, "",
 991                         MS_REMOUNT | MS_SILENT, "");
 992         if (rc)
 993                 return -1;
 994
 995         dev->mounted_rw = true;
 996         *release = true;
 997         return 0;
 998 }
 999
1000 void device_release_write(struct discover_device *dev, bool release)
1001 {
1002         if (!release)
1003                 return;
1004
1005         pb_log("remounting device %s read-only\n", dev->device_path);
1006         mount(dev->device_path, dev->mount_path, "",
1007                         MS_REMOUNT | MS_RDONLY | MS_SILENT, "");
1008         dev->mounted_rw = false;
1009 }
1010
1011 #else
1012
1013 static int device_handler_init_sources(
1014                 struct device_handler *handler __attribute__((unused)))
1015 {
1016         return 0;
1017 }
1018
1019 static void device_handler_reinit_sources(
1020                 struct device_handler *handler __attribute__((unused)))
1021 {
1022 }
1023
1024 static int umount_device(struct discover_device *dev __attribute__((unused)))
1025 {
1026         return 0;
1027 }
1028
1029 static int __attribute__((unused)) mount_device(
1030                 struct discover_device *dev __attribute__((unused)))
1031 {
1032         return 0;
1033 }
1034
1035 int device_request_write(struct discover_device *dev __attribute__((unused)),
1036                 bool *release)
1037 {
1038         *release = true;
1039         return 0;
1040 }
1041
1042 void device_release_write(struct discover_device *dev __attribute__((unused)),
1043         bool release __attribute__((unused)))
1044 {
1045 }
1046
1047 #endif
1048