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         if (config_get()->safe_mode)
 289                 return handler;
 290
 291         rc = device_handler_init_sources(handler);
 292         if (rc) {
 293                 talloc_free(handler);
 294                 return NULL;
 295         }
 296
 297         return handler;
 298 }
 299
 300 void device_handler_reinit(struct device_handler *handler)
 301 {
 302         struct discover_boot_option *opt, *tmp;
 303         unsigned int i;
 304
 305         device_handler_cancel_default(handler);
 306
 307         /* free unresolved boot options */
 308         list_for_each_entry_safe(&handler->unresolved_boot_options,
 309                         opt, tmp, list)
 310                 talloc_free(opt);
 311         list_init(&handler->unresolved_boot_options);
 312
 313         /* drop all devices */
 314         for (i = 0; i < handler->n_devices; i++)
 315                 discover_server_notify_device_remove(handler->server,
 316                                 handler->devices[i]->device);
 317
 318         talloc_free(handler->devices);
 319         handler->devices = NULL;
 320         handler->n_devices = 0;
 321
 322         device_handler_reinit_sources(handler);
 323 }
 324
 325 void device_handler_remove(struct device_handler *handler,
 326                 struct discover_device *device)
 327 {
 328         struct discover_boot_option *opt, *tmp;
 329         unsigned int i;
 330
 331         for (i = 0; i < handler->n_devices; i++)
 332                 if (handler->devices[i] == device)
 333                         break;
 334
 335         if (i == handler->n_devices) {
 336                 talloc_free(device);
 337                 return;
 338         }
 339
 340         /* Free any unresolved options, as they're currently allocated
 341          * against the handler */
 342         list_for_each_entry_safe(&handler->unresolved_boot_options,
 343                         opt, tmp, list) {
 344                 if (opt->device != device)
 345                         continue;
 346                 list_remove(&opt->list);
 347                 talloc_free(opt);
 348         }
 349
 350         /* if this is a network device, we have to unregister it from the
 351          * network code */
 352         if (device->device->type == DEVICE_TYPE_NETWORK)
 353                 network_unregister_device(handler->network, device);
 354
 355         handler->n_devices--;
 356         memmove(&handler->devices[i], &handler->devices[i + 1],
 357                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 358         handler->devices = talloc_realloc(handler, handler->devices,
 359                 struct discover_device *, handler->n_devices);
 360
 361         if (device->notified)
 362                 discover_server_notify_device_remove(handler->server,
 363                                                         device->device);
 364
 365         talloc_free(device);
 366 }
 367
 368 static void boot_status(void *arg, struct boot_status *status)
 369 {
 370         struct device_handler *handler = arg;
 371
 372         discover_server_notify_boot_status(handler->server, status);
 373 }
 374
 375 static void countdown_status(struct device_handler *handler,
 376                 struct discover_boot_option *opt, unsigned int sec)
 377 {
 378         struct boot_status status;
 379
 380         status.type = BOOT_STATUS_INFO;
 381         status.progress = -1;
 382         status.detail = NULL;
 383         status.message = talloc_asprintf(handler,
 384                         "Booting in %d sec: %s", sec, opt->option->name);
 385
 386         discover_server_notify_boot_status(handler->server, &status);
 387
 388         talloc_free(status.message);
 389 }
 390
 391 static int default_timeout(void *arg)
 392 {
 393         struct device_handler *handler = arg;
 394         struct discover_boot_option *opt;
 395
 396         if (!handler->default_boot_option)
 397                 return 0;
 398
 399         if (handler->pending_boot)
 400                 return 0;
 401
 402         opt = handler->default_boot_option;
 403
 404         if (handler->sec_to_boot) {
 405                 countdown_status(handler, opt, handler->sec_to_boot);
 406                 handler->sec_to_boot--;
 407                 handler->timeout_waiter = waiter_register_timeout(
 408                                                 handler->waitset, 1000,
 409                                                 default_timeout, handler);
 410                 return 0;
 411         }
 412
 413         handler->timeout_waiter = NULL;
 414
 415         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 416
 417         handler->pending_boot = boot(handler, handler->default_boot_option,
 418                         NULL, handler->dry_run, boot_status, handler);
 419         handler->pending_boot_is_default = true;
 420         return 0;
 421 }
 422
 423 static bool priority_match(struct boot_priority *prio,
 424                 struct discover_boot_option *opt)
 425 {
 426         return prio->type == opt->device->device->type ||
 427                 prio->type == DEVICE_TYPE_ANY;
 428 }
 429
 430 static int default_option_priority(struct discover_boot_option *opt)
 431 {
 432         const struct config *config;
 433         struct boot_priority *prio;
 434         unsigned int i;
 435
 436         config = config_get();
 437
 438         for (i = 0; i < config->n_boot_priorities; i++) {
 439                 prio = &config->boot_priorities[i];
 440                 if (priority_match(prio, opt))
 441                         return prio->priority;
 442         }
 443
 444         return 0;
 445 }
 446
 447 static bool device_allows_default(struct discover_device *dev)
 448 {
 449         const char *dev_str;
 450
 451         dev_str = config_get()->boot_device;
 452
 453         if (!dev_str || !strlen(dev_str))
 454                 return true;
 455
 456         /* default devices are specified by UUIDs at present */
 457         if (strcmp(dev->uuid, dev_str))
 458                 return false;
 459
 460         return true;
 461 }
 462
 463 static void set_default(struct device_handler *handler,
 464                 struct discover_boot_option *opt)
 465 {
 466         int new_prio;
 467
 468         if (!handler->autoboot_enabled)
 469                 return;
 470
 471         /* do we allow default-booting from this device? */
 472         if (!device_allows_default(opt->device))
 473                 return;
 474
 475         new_prio = default_option_priority(opt);
 476
 477         /* A negative priority indicates that we don't want to boot this device
 478          * by default */
 479         if (new_prio < 0)
 480                 return;
 481
 482         /* Resolve any conflicts: if we have a new default option, it only
 483          * replaces the current if it has a higher priority. */
 484         if (handler->default_boot_option) {
 485                 int cur_prio;
 486
 487                 cur_prio = default_option_priority(
 488                                         handler->default_boot_option);
 489
 490                 if (new_prio > cur_prio) {
 491                         handler->default_boot_option = opt;
 492                         /* extend the timeout a little, so the user sees some
 493                          * indication of the change */
 494                         handler->sec_to_boot += 2;
 495                 }
 496
 497                 return;
 498         }
 499
 500         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 501         handler->default_boot_option = opt;
 502
 503         pb_log("Boot option %s set as default, timeout %u sec.\n",
 504                opt->option->id, handler->sec_to_boot);
 505
 506         default_timeout(handler);
 507 }
 508
 509 static bool resource_is_resolved(struct resource *res)
 510 {
 511         return !res || res->resolved;
 512 }
 513
 514 /* We only use this in an assert, which will disappear if we're compiling
 515  * with NDEBUG, so we need the 'used' attribute for these builds */
 516 static bool __attribute__((used)) boot_option_is_resolved(
 517                 struct discover_boot_option *opt)
 518 {
 519         return resource_is_resolved(opt->boot_image) &&
 520                 resource_is_resolved(opt->initrd) &&
 521                 resource_is_resolved(opt->dtb) &&
 522                 resource_is_resolved(opt->icon);
 523 }
 524
 525 static bool resource_resolve(struct resource *res, const char *name,
 526                 struct discover_boot_option *opt,
 527                 struct device_handler *handler)
 528 {
 529         struct parser *parser = opt->source;
 530
 531         if (resource_is_resolved(res))
 532                 return true;
 533
 534         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
 535                         opt->option->id, name, parser->name);
 536         parser->resolve_resource(handler, res);
 537
 538         return res->resolved;
 539 }
 540
 541 static bool boot_option_resolve(struct discover_boot_option *opt,
 542                 struct device_handler *handler)
 543 {
 544         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 545                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 546                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 547                 resource_resolve(opt->icon, "icon", opt, handler);
 548 }
 549
 550 static void boot_option_finalise(struct device_handler *handler,
 551                 struct discover_boot_option *opt)
 552 {
 553         assert(boot_option_is_resolved(opt));
 554
 555         /* check that the parsers haven't set any of the final data */
 556         assert(!opt->option->boot_image_file);
 557         assert(!opt->option->initrd_file);
 558         assert(!opt->option->dtb_file);
 559         assert(!opt->option->icon_file);
 560         assert(!opt->option->device_id);
 561
 562         if (opt->boot_image)
 563                 opt->option->boot_image_file = opt->boot_image->url->full;
 564         if (opt->initrd)
 565                 opt->option->initrd_file = opt->initrd->url->full;
 566         if (opt->dtb)
 567                 opt->option->dtb_file = opt->dtb->url->full;
 568         if (opt->icon)
 569                 opt->option->icon_file = opt->icon->url->full;
 570
 571         opt->option->device_id = opt->device->device->id;
 572
 573         if (opt->option->is_default)
 574                 set_default(handler, opt);
 575 }
 576
 577 static void notify_boot_option(struct device_handler *handler,
 578                 struct discover_boot_option *opt)
 579 {
 580         struct discover_device *dev = opt->device;
 581
 582         if (!dev->notified)
 583                 discover_server_notify_device_add(handler->server,
 584                                                   opt->device->device);
 585         dev->notified = true;
 586         discover_server_notify_boot_option_add(handler->server, opt->option);
 587 }
 588
 589 static void process_boot_option_queue(struct device_handler *handler)
 590 {
 591         struct discover_boot_option *opt, *tmp;
 592
 593         list_for_each_entry_safe(&handler->unresolved_boot_options,
 594                         opt, tmp, list) {
 595
 596                 pb_debug("queue: attempting resolution for %s\n",
 597                                 opt->option->id);
 598
 599                 if (!boot_option_resolve(opt, handler))
 600                         continue;
 601
 602                 pb_debug("\tresolved!\n");
 603
 604                 list_remove(&opt->list);
 605                 list_add_tail(&opt->device->boot_options, &opt->list);
 606                 talloc_steal(opt->device, opt);
 607                 boot_option_finalise(handler, opt);
 608                 notify_boot_option(handler, opt);
 609         }
 610 }
 611
 612 struct discover_context *device_handler_discover_context_create(
 613                 struct device_handler *handler,
 614                 struct discover_device *device)
 615 {
 616         struct discover_context *ctx;
 617
 618         ctx = talloc_zero(handler, struct discover_context);
 619         ctx->device = device;
 620         list_init(&ctx->boot_options);
 621
 622         return ctx;
 623 }
 624
 625 /**
 626  * context_commit - Commit a temporary discovery context to the handler,
 627  * and notify the clients about any new options / devices
 628  */
 629 void device_handler_discover_context_commit(struct device_handler *handler,
 630                 struct discover_context *ctx)
 631 {
 632         struct discover_device *dev = ctx->device;
 633         struct discover_boot_option *opt, *tmp;
 634
 635         if (!device_lookup_by_id(handler, dev->device->id))
 636                 device_handler_add_device(handler, dev);
 637
 638         /* move boot options from the context to the device */
 639         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
 640                 list_remove(&opt->list);
 641
 642                 if (boot_option_resolve(opt, handler)) {
 643                         pb_log("boot option %s is resolved, "
 644                                         "sending to clients\n",
 645                                         opt->option->id);
 646                         list_add_tail(&dev->boot_options, &opt->list);
 647                         talloc_steal(dev, opt);
 648                         boot_option_finalise(handler, opt);
 649                         notify_boot_option(handler, opt);
 650                 } else {
 651                         if (!opt->source->resolve_resource) {
 652                                 pb_log("parser %s gave us an unresolved "
 653                                         "resource (%s), but no way to "
 654                                         "resolve it\n",
 655                                         opt->source->name, opt->option->id);
 656                                 talloc_free(opt);
 657                         } else {
 658                                 pb_log("boot option %s is unresolved, "
 659                                                 "adding to queue\n",
 660                                                 opt->option->id);
 661                                 list_add(&handler->unresolved_boot_options,
 662                                                 &opt->list);
 663                                 talloc_steal(handler, opt);
 664                         }
 665                 }
 666         }
 667 }
 668
 669 void device_handler_add_device(struct device_handler *handler,
 670                 struct discover_device *device)
 671 {
 672         handler->n_devices++;
 673         handler->devices = talloc_realloc(handler, handler->devices,
 674                                 struct discover_device *, handler->n_devices);
 675         handler->devices[handler->n_devices - 1] = device;
 676
 677         if (device->device->type == DEVICE_TYPE_NETWORK)
 678                 network_register_device(handler->network, device);
 679 }
 680
 681 /* Start discovery on a hotplugged device. The device will be in our devices
 682  * array, but has only just been initialised by the hotplug source.
 683  */
 684 int device_handler_discover(struct device_handler *handler,
 685                 struct discover_device *dev)
 686 {
 687         struct discover_context *ctx;
 688         int rc;
 689
 690         process_boot_option_queue(handler);
 691
 692         /* create our context */
 693         ctx = device_handler_discover_context_create(handler, dev);
 694
 695         rc = mount_device(dev);
 696         if (rc)
 697                 goto out;
 698
 699         /* add this device to our system info */
 700         system_info_register_blockdev(dev->device->id, dev->uuid,
 701                         dev->mount_path);
 702
 703         /* run the parsers. This will populate the ctx's boot_option list. */
 704         iterate_parsers(ctx);
 705
 706         /* add discovered stuff to the handler */
 707         device_handler_discover_context_commit(handler, ctx);
 708
 709 out:
 710         talloc_free(ctx);
 711
 712         return 0;
 713 }
 714
 715 /* Incoming dhcp event */
 716 int device_handler_dhcp(struct device_handler *handler,
 717                 struct discover_device *dev, struct event *event)
 718 {
 719         struct discover_context *ctx;
 720
 721         /* create our context */
 722         ctx = device_handler_discover_context_create(handler, dev);
 723         ctx->event = event;
 724
 725         iterate_parsers(ctx);
 726
 727         device_handler_discover_context_commit(handler, ctx);
 728
 729         talloc_free(ctx);
 730
 731         return 0;
 732 }
 733
 734 /* incoming conf event */
 735 int device_handler_conf(struct device_handler *handler,
 736                 struct discover_device *dev, struct pb_url *url)
 737 {
 738         struct discover_context *ctx;
 739
 740         /* create our context */
 741         ctx = device_handler_discover_context_create(handler, dev);
 742         ctx->conf_url = url;
 743
 744         iterate_parsers(ctx);
 745
 746         device_handler_discover_context_commit(handler, ctx);
 747
 748         talloc_free(ctx);
 749
 750         return 0;
 751 }
 752
 753 static struct discover_boot_option *find_boot_option_by_id(
 754                 struct device_handler *handler, const char *id)
 755 {
 756         unsigned int i;
 757
 758         for (i = 0; i < handler->n_devices; i++) {
 759                 struct discover_device *dev = handler->devices[i];
 760                 struct discover_boot_option *opt;
 761
 762                 list_for_each_entry(&dev->boot_options, opt, list)
 763                         if (!strcmp(opt->option->id, id))
 764                                 return opt;
 765         }
 766
 767         return NULL;
 768 }
 769
 770 void device_handler_boot(struct device_handler *handler,
 771                 struct boot_command *cmd)
 772 {
 773         struct discover_boot_option *opt = NULL;
 774
 775         if (cmd->option_id && strlen(cmd->option_id))
 776                 opt = find_boot_option_by_id(handler, cmd->option_id);
 777
 778         if (handler->pending_boot)
 779                 boot_cancel(handler->pending_boot);
 780         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
 781                         boot_status, handler);
 782         handler->pending_boot_is_default = false;
 783 }
 784
 785 void device_handler_cancel_default(struct device_handler *handler)
 786 {
 787         struct boot_status status;
 788
 789         if (handler->timeout_waiter)
 790                 waiter_remove(handler->timeout_waiter);
 791
 792         handler->timeout_waiter = NULL;
 793         handler->autoboot_enabled = false;
 794
 795         /* we only send status if we had a default boot option queued */
 796         if (!handler->default_boot_option)
 797                 return;
 798
 799         pb_log("Cancelling default boot option\n");
 800
 801         if (handler->pending_boot && handler->pending_boot_is_default) {
 802                 boot_cancel(handler->pending_boot);
 803                 handler->pending_boot = NULL;
 804                 handler->pending_boot_is_default = false;
 805         }
 806
 807         handler->default_boot_option = NULL;
 808
 809         status.type = BOOT_STATUS_INFO;
 810         status.progress = -1;
 811         status.detail = NULL;
 812         status.message = "Default boot cancelled";
 813
 814         discover_server_notify_boot_status(handler->server, &status);
 815 }
 816
 817 void device_handler_update_config(struct device_handler *handler,
 818                 struct config *config)
 819 {
 820         config_set(config);
 821         discover_server_notify_config(handler->server, config);
 822         device_handler_reinit(handler);
 823 }
 824
 825 #ifndef PETITBOOT_TEST
 826
 827 static int device_handler_init_sources(struct device_handler *handler)
 828 {
 829         /* init our device sources: udev, network and user events */
 830         handler->udev = udev_init(handler, handler->waitset);
 831         if (!handler->udev)
 832                 return -1;
 833
 834         handler->network = network_init(handler, handler->waitset,
 835                         handler->dry_run);
 836         if (!handler->network)
 837                 return -1;
 838
 839         handler->user_event = user_event_init(handler, handler->waitset);
 840         if (!handler->user_event)
 841                 return -1;
 842
 843         return 0;
 844 }
 845
 846 static void device_handler_reinit_sources(struct device_handler *handler)
 847 {
 848         /* if we haven't initialised sources previously (becuase we started in
 849          * safe mode), then init once here. */
 850         if (!(handler->udev || handler->network || handler->user_event)) {
 851                 device_handler_init_sources(handler);
 852                 return;
 853         }
 854
 855         udev_reinit(handler->udev);
 856
 857         network_shutdown(handler->network);
 858         handler->network = network_init(handler, handler->waitset,
 859                         handler->dry_run);
 860 }
 861
 862 static bool check_existing_mount(struct discover_device *dev)
 863 {
 864         struct stat devstat, mntstat;
 865         struct mntent *mnt;
 866         FILE *fp;
 867         int rc;
 868
 869         rc = stat(dev->device_path, &devstat);
 870         if (rc) {
 871                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
 872                 return false;
 873         }
 874
 875         if (!S_ISBLK(devstat.st_mode)) {
 876                 pb_debug("%s: %s isn't a block device?\n", __func__,
 877                                 dev->device_path);
 878                 return false;
 879         }
 880
 881         fp = fopen("/proc/self/mounts", "r");
 882
 883         for (;;) {
 884                 mnt = getmntent(fp);
 885                 if (!mnt)
 886                         break;
 887
 888                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
 889                         continue;
 890
 891                 rc = stat(mnt->mnt_fsname, &mntstat);
 892                 if (rc)
 893                         continue;
 894
 895                 if (!S_ISBLK(mntstat.st_mode))
 896                         continue;
 897
 898                 if (mntstat.st_rdev == devstat.st_rdev) {
 899                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
 900                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
 901                         dev->mounted = true;
 902                         dev->unmount = false;
 903
 904                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
 905                                         __func__, dev->device_path,
 906                                         dev->mounted_rw ? 'w' : 'o',
 907                                         mnt->mnt_dir);
 908                         break;
 909                 }
 910         }
 911
 912         fclose(fp);
 913
 914         return mnt != NULL;
 915 }
 916
 917 static int mount_device(struct discover_device *dev)
 918 {
 919         const char *fstype;
 920         int rc;
 921
 922         if (!dev->device_path)
 923                 return -1;
 924
 925         if (dev->mounted)
 926                 return 0;
 927
 928         if (check_existing_mount(dev))
 929                 return 0;
 930
 931         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
 932         if (!fstype)
 933                 return 0;
 934
 935         dev->mount_path = join_paths(dev, mount_base(),
 936                                         dev->device_path);
 937
 938         if (pb_mkdir_recursive(dev->mount_path)) {
 939                 pb_log("couldn't create mount directory %s: %s\n",
 940                                 dev->mount_path, strerror(errno));
 941                 goto err_free;
 942         }
 943
 944         pb_log("mounting device %s read-only\n", dev->device_path);
 945         errno = 0;
 946         rc = mount(dev->device_path, dev->mount_path, fstype,
 947                         MS_RDONLY | MS_SILENT, "");
 948         if (!rc) {
 949                 dev->mounted = true;
 950                 dev->mounted_rw = false;
 951                 dev->unmount = true;
 952                 return 0;
 953         }
 954
 955         pb_log("couldn't mount device %s: mount failed: %s\n",
 956                         dev->device_path, strerror(errno));
 957
 958         pb_rmdir_recursive(mount_base(), dev->mount_path);
 959 err_free:
 960         talloc_free(dev->mount_path);
 961         dev->mount_path = NULL;
 962         return -1;
 963 }
 964
 965 static int umount_device(struct discover_device *dev)
 966 {
 967         int rc;
 968
 969         if (!dev->mounted || !dev->unmount)
 970                 return 0;
 971
 972         pb_log("unmounting device %s\n", dev->device_path);
 973         rc = umount(dev->mount_path);
 974         if (rc)
 975                 return -1;
 976
 977         dev->mounted = false;
 978
 979         pb_rmdir_recursive(mount_base(), dev->mount_path);
 980
 981         talloc_free(dev->mount_path);
 982         dev->mount_path = NULL;
 983
 984         return 0;
 985 }
 986
 987 int device_request_write(struct discover_device *dev, bool *release)
 988 {
 989         int rc;
 990
 991         *release = false;
 992
 993         if (!dev->mounted)
 994                 return -1;
 995
 996         if (dev->mounted_rw)
 997                 return 0;
 998
 999         pb_log("remounting device %s read-write\n", dev->device_path);
1000         rc = mount(dev->device_path, dev->mount_path, "",
1001                         MS_REMOUNT | MS_SILENT, "");
1002         if (rc)
1003                 return -1;
1004
1005         dev->mounted_rw = true;
1006         *release = true;
1007         return 0;
1008 }
1009
1010 void device_release_write(struct discover_device *dev, bool release)
1011 {
1012         if (!release)
1013                 return;
1014
1015         pb_log("remounting device %s read-only\n", dev->device_path);
1016         mount(dev->device_path, dev->mount_path, "",
1017                         MS_REMOUNT | MS_RDONLY | MS_SILENT, "");
1018         dev->mounted_rw = false;
1019 }
1020
1021 #else
1022
1023 static int device_handler_init_sources(
1024                 struct device_handler *handler __attribute__((unused)))
1025 {
1026         return 0;
1027 }
1028
1029 static void device_handler_reinit_sources(
1030                 struct device_handler *handler __attribute__((unused)))
1031 {
1032 }
1033
1034 static int umount_device(struct discover_device *dev __attribute__((unused)))
1035 {
1036         return 0;
1037 }
1038
1039 static int __attribute__((unused)) mount_device(
1040                 struct discover_device *dev __attribute__((unused)))
1041 {
1042         return 0;
1043 }
1044
1045 int device_request_write(struct discover_device *dev __attribute__((unused)),
1046                 bool *release)
1047 {
1048         *release = true;
1049         return 0;
1050 }
1051
1052 void device_release_write(struct discover_device *dev __attribute__((unused)),
1053         bool release __attribute__((unused)))
1054 {
1055 }
1056
1057 #endif
1058