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