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 #include <i18n/i18n.h>
  20
  21 #include "device-handler.h"
  22 #include "discover-server.h"
  23 #include "user-event.h"
  24 #include "platform.h"
  25 #include "event.h"
  26 #include "parser.h"
  27 #include "resource.h"
  28 #include "paths.h"
  29 #include "sysinfo.h"
  30 #include "boot.h"
  31 #include "udev.h"
  32 #include "network.h"
  33
  34 struct device_handler {
  35         struct discover_server  *server;
  36         int                     dry_run;
  37
  38         struct pb_udev          *udev;
  39         struct network          *network;
  40         struct user_event       *user_event;
  41
  42         struct discover_device  **devices;
  43         unsigned int            n_devices;
  44
  45         struct waitset          *waitset;
  46         struct waiter           *timeout_waiter;
  47         bool                    autoboot_enabled;
  48         unsigned int            sec_to_boot;
  49
  50         struct discover_boot_option *default_boot_option;
  51         struct list             unresolved_boot_options;
  52
  53         struct boot_task        *pending_boot;
  54         bool                    pending_boot_is_default;
  55 };
  56
  57 static int mount_device(struct discover_device *dev);
  58 static int umount_device(struct discover_device *dev);
  59
  60 static int device_handler_init_sources(struct device_handler *handler);
  61 static void device_handler_reinit_sources(struct device_handler *handler);
  62
  63 static void device_handler_update_lang(const char *lang);
  64
  65 void discover_context_add_boot_option(struct discover_context *ctx,
  66                 struct discover_boot_option *boot_option)
  67 {
  68         boot_option->source = ctx->parser;
  69         list_add_tail(&ctx->boot_options, &boot_option->list);
  70         talloc_steal(ctx, boot_option);
  71 }
  72
  73 /**
  74  * device_handler_get_device_count - Get the count of current handler devices.
  75  */
  76
  77 int device_handler_get_device_count(const struct device_handler *handler)
  78 {
  79         return handler->n_devices;
  80 }
  81
  82 /**
  83  * device_handler_get_device - Get a handler device by index.
  84  */
  85
  86 const struct discover_device *device_handler_get_device(
  87         const struct device_handler *handler, unsigned int index)
  88 {
  89         if (index >= handler->n_devices) {
  90                 assert(0 && "bad index");
  91                 return NULL;
  92         }
  93
  94         return handler->devices[index];
  95 }
  96
  97 struct discover_boot_option *discover_boot_option_create(
  98                 struct discover_context *ctx,
  99                 struct discover_device *device)
 100 {
 101         struct discover_boot_option *opt;
 102
 103         opt = talloc_zero(ctx, struct discover_boot_option);
 104         opt->option = talloc_zero(opt, struct boot_option);
 105         opt->device = device;
 106
 107         return opt;
 108 }
 109
 110 static int device_match_uuid(struct discover_device *dev, const char *uuid)
 111 {
 112         return dev->uuid && !strcmp(dev->uuid, uuid);
 113 }
 114
 115 static int device_match_label(struct discover_device *dev, const char *label)
 116 {
 117         return dev->label && !strcmp(dev->label, label);
 118 }
 119
 120 static int device_match_id(struct discover_device *dev, const char *id)
 121 {
 122         return !strcmp(dev->device->id, id);
 123 }
 124
 125 static int device_match_serial(struct discover_device *dev, const char *serial)
 126 {
 127         const char *val = discover_device_get_param(dev, "ID_SERIAL");
 128         return val && !strcmp(val, serial);
 129 }
 130
 131 static struct discover_device *device_lookup(
 132                 struct device_handler *device_handler,
 133                 int (match_fn)(struct discover_device *, const char *),
 134                 const char *str)
 135 {
 136         struct discover_device *dev;
 137         unsigned int i;
 138
 139         if (!str)
 140                 return NULL;
 141
 142         for (i = 0; i < device_handler->n_devices; i++) {
 143                 dev = device_handler->devices[i];
 144
 145                 if (match_fn(dev, str))
 146                         return dev;
 147         }
 148
 149         return NULL;
 150 }
 151
 152 struct discover_device *device_lookup_by_name(struct device_handler *handler,
 153                 const char *name)
 154 {
 155         if (!strncmp(name, "/dev/", strlen("/dev/")))
 156                 name += strlen("/dev/");
 157
 158         return device_lookup_by_id(handler, name);
 159 }
 160
 161 struct discover_device *device_lookup_by_uuid(
 162                 struct device_handler *device_handler,
 163                 const char *uuid)
 164 {
 165         return device_lookup(device_handler, device_match_uuid, uuid);
 166 }
 167
 168 struct discover_device *device_lookup_by_label(
 169                 struct device_handler *device_handler,
 170                 const char *label)
 171 {
 172         return device_lookup(device_handler, device_match_label, label);
 173 }
 174
 175 struct discover_device *device_lookup_by_id(
 176                 struct device_handler *device_handler,
 177                 const char *id)
 178 {
 179         return device_lookup(device_handler, device_match_id, id);
 180 }
 181
 182 struct discover_device *device_lookup_by_serial(
 183                 struct device_handler *device_handler,
 184                 const char *serial)
 185 {
 186         return device_lookup(device_handler, device_match_serial, serial);
 187 }
 188
 189 void device_handler_destroy(struct device_handler *handler)
 190 {
 191         talloc_free(handler);
 192 }
 193
 194 static int destroy_device(void *arg)
 195 {
 196         struct discover_device *dev = arg;
 197
 198         umount_device(dev);
 199
 200         return 0;
 201 }
 202
 203 struct discover_device *discover_device_create(struct device_handler *handler,
 204                 const char *id)
 205 {
 206         struct discover_device *dev;
 207
 208         dev = device_lookup_by_id(handler, id);
 209         if (dev)
 210                 return dev;
 211
 212         dev = talloc_zero(handler, struct discover_device);
 213         dev->device = talloc_zero(dev, struct device);
 214         dev->device->id = talloc_strdup(dev->device, id);
 215         list_init(&dev->params);
 216         list_init(&dev->boot_options);
 217
 218         talloc_set_destructor(dev, destroy_device);
 219
 220         return dev;
 221 }
 222
 223 struct discover_device_param {
 224         char                    *name;
 225         char                    *value;
 226         struct list_item        list;
 227 };
 228
 229 void discover_device_set_param(struct discover_device *device,
 230                 const char *name, const char *value)
 231 {
 232         struct discover_device_param *param;
 233         bool found = false;
 234
 235         list_for_each_entry(&device->params, param, list) {
 236                 if (!strcmp(param->name, name)) {
 237                         found = true;
 238                         break;
 239                 }
 240         }
 241
 242         if (!found) {
 243                 if (!value)
 244                         return;
 245                 param = talloc(device, struct discover_device_param);
 246                 param->name = talloc_strdup(param, name);
 247                 list_add(&device->params, &param->list);
 248         } else {
 249                 if (!value) {
 250                         list_remove(&param->list);
 251                         talloc_free(param);
 252                         return;
 253                 }
 254                 talloc_free(param->value);
 255         }
 256
 257         param->value = talloc_strdup(param, value);
 258 }
 259
 260 const char *discover_device_get_param(struct discover_device *device,
 261                 const char *name)
 262 {
 263         struct discover_device_param *param;
 264
 265         list_for_each_entry(&device->params, param, list) {
 266                 if (!strcmp(param->name, name))
 267                         return param->value;
 268         }
 269         return NULL;
 270 }
 271
 272 struct device_handler *device_handler_init(struct discover_server *server,
 273                 struct waitset *waitset, int dry_run)
 274 {
 275         struct device_handler *handler;
 276         int rc;
 277
 278         handler = talloc_zero(NULL, struct device_handler);
 279         handler->server = server;
 280         handler->waitset = waitset;
 281         handler->dry_run = dry_run;
 282         handler->autoboot_enabled = config_get()->autoboot_enabled;
 283
 284         list_init(&handler->unresolved_boot_options);
 285
 286         /* set up our mount point base */
 287         pb_mkdir_recursive(mount_base());
 288
 289         parser_init();
 290
 291         if (config_get()->safe_mode)
 292                 return handler;
 293
 294         rc = device_handler_init_sources(handler);
 295         if (rc) {
 296                 talloc_free(handler);
 297                 return NULL;
 298         }
 299
 300         return handler;
 301 }
 302
 303 void device_handler_reinit(struct device_handler *handler)
 304 {
 305         struct discover_boot_option *opt, *tmp;
 306         unsigned int i;
 307
 308         device_handler_cancel_default(handler);
 309
 310         /* free unresolved boot options */
 311         list_for_each_entry_safe(&handler->unresolved_boot_options,
 312                         opt, tmp, list)
 313                 talloc_free(opt);
 314         list_init(&handler->unresolved_boot_options);
 315
 316         /* drop all devices */
 317         for (i = 0; i < handler->n_devices; i++)
 318                 discover_server_notify_device_remove(handler->server,
 319                                 handler->devices[i]->device);
 320
 321         talloc_free(handler->devices);
 322         handler->devices = NULL;
 323         handler->n_devices = 0;
 324
 325         device_handler_reinit_sources(handler);
 326 }
 327
 328 void device_handler_remove(struct device_handler *handler,
 329                 struct discover_device *device)
 330 {
 331         struct discover_boot_option *opt, *tmp;
 332         unsigned int i;
 333
 334         for (i = 0; i < handler->n_devices; i++)
 335                 if (handler->devices[i] == device)
 336                         break;
 337
 338         if (i == handler->n_devices) {
 339                 talloc_free(device);
 340                 return;
 341         }
 342
 343         /* Free any unresolved options, as they're currently allocated
 344          * against the handler */
 345         list_for_each_entry_safe(&handler->unresolved_boot_options,
 346                         opt, tmp, list) {
 347                 if (opt->device != device)
 348                         continue;
 349                 list_remove(&opt->list);
 350                 talloc_free(opt);
 351         }
 352
 353         /* if this is a network device, we have to unregister it from the
 354          * network code */
 355         if (device->device->type == DEVICE_TYPE_NETWORK)
 356                 network_unregister_device(handler->network, device);
 357
 358         handler->n_devices--;
 359         memmove(&handler->devices[i], &handler->devices[i + 1],
 360                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 361         handler->devices = talloc_realloc(handler, handler->devices,
 362                 struct discover_device *, handler->n_devices);
 363
 364         if (device->notified)
 365                 discover_server_notify_device_remove(handler->server,
 366                                                         device->device);
 367
 368         talloc_free(device);
 369 }
 370
 371 static void boot_status(void *arg, struct boot_status *status)
 372 {
 373         struct device_handler *handler = arg;
 374
 375         discover_server_notify_boot_status(handler->server, status);
 376 }
 377
 378 static void countdown_status(struct device_handler *handler,
 379                 struct discover_boot_option *opt, unsigned int sec)
 380 {
 381         struct boot_status status;
 382
 383         status.type = BOOT_STATUS_INFO;
 384         status.progress = -1;
 385         status.detail = NULL;
 386         status.message = talloc_asprintf(handler,
 387                         "Booting in %d sec: %s", sec, opt->option->name);
 388
 389         discover_server_notify_boot_status(handler->server, &status);
 390
 391         talloc_free(status.message);
 392 }
 393
 394 static int default_timeout(void *arg)
 395 {
 396         struct device_handler *handler = arg;
 397         struct discover_boot_option *opt;
 398
 399         if (!handler->default_boot_option)
 400                 return 0;
 401
 402         if (handler->pending_boot)
 403                 return 0;
 404
 405         opt = handler->default_boot_option;
 406
 407         if (handler->sec_to_boot) {
 408                 countdown_status(handler, opt, handler->sec_to_boot);
 409                 handler->sec_to_boot--;
 410                 handler->timeout_waiter = waiter_register_timeout(
 411                                                 handler->waitset, 1000,
 412                                                 default_timeout, handler);
 413                 return 0;
 414         }
 415
 416         handler->timeout_waiter = NULL;
 417
 418         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 419
 420         handler->pending_boot = boot(handler, handler->default_boot_option,
 421                         NULL, handler->dry_run, boot_status, handler);
 422         handler->pending_boot_is_default = true;
 423         return 0;
 424 }
 425
 426 static bool priority_match(struct boot_priority *prio,
 427                 struct discover_boot_option *opt)
 428 {
 429         return prio->type == opt->device->device->type ||
 430                 prio->type == DEVICE_TYPE_ANY;
 431 }
 432
 433 static int default_option_priority(struct discover_boot_option *opt)
 434 {
 435         const struct config *config;
 436         struct boot_priority *prio;
 437         unsigned int i;
 438
 439         config = config_get();
 440
 441         for (i = 0; i < config->n_boot_priorities; i++) {
 442                 prio = &config->boot_priorities[i];
 443                 if (priority_match(prio, opt))
 444                         return prio->priority;
 445         }
 446
 447         return 0;
 448 }
 449
 450 static bool device_allows_default(struct discover_device *dev)
 451 {
 452         const char *dev_str;
 453
 454         dev_str = config_get()->boot_device;
 455
 456         if (!dev_str || !strlen(dev_str))
 457                 return true;
 458
 459         /* default devices are specified by UUIDs at present */
 460         if (strcmp(dev->uuid, dev_str))
 461                 return false;
 462
 463         return true;
 464 }
 465
 466 static void set_default(struct device_handler *handler,
 467                 struct discover_boot_option *opt)
 468 {
 469         int new_prio;
 470
 471         if (!handler->autoboot_enabled)
 472                 return;
 473
 474         /* do we allow default-booting from this device? */
 475         if (!device_allows_default(opt->device))
 476                 return;
 477
 478         new_prio = default_option_priority(opt);
 479
 480         /* A negative priority indicates that we don't want to boot this device
 481          * by default */
 482         if (new_prio < 0)
 483                 return;
 484
 485         /* Resolve any conflicts: if we have a new default option, it only
 486          * replaces the current if it has a higher priority. */
 487         if (handler->default_boot_option) {
 488                 int cur_prio;
 489
 490                 cur_prio = default_option_priority(
 491                                         handler->default_boot_option);
 492
 493                 if (new_prio > cur_prio) {
 494                         handler->default_boot_option = opt;
 495                         /* extend the timeout a little, so the user sees some
 496                          * indication of the change */
 497                         handler->sec_to_boot += 2;
 498                 }
 499
 500                 return;
 501         }
 502
 503         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 504         handler->default_boot_option = opt;
 505
 506         pb_log("Boot option %s set as default, timeout %u sec.\n",
 507                opt->option->id, handler->sec_to_boot);
 508
 509         default_timeout(handler);
 510 }
 511
 512 static bool resource_is_resolved(struct resource *res)
 513 {
 514         return !res || res->resolved;
 515 }
 516
 517 /* We only use this in an assert, which will disappear if we're compiling
 518  * with NDEBUG, so we need the 'used' attribute for these builds */
 519 static bool __attribute__((used)) boot_option_is_resolved(
 520                 struct discover_boot_option *opt)
 521 {
 522         return resource_is_resolved(opt->boot_image) &&
 523                 resource_is_resolved(opt->initrd) &&
 524                 resource_is_resolved(opt->dtb) &&
 525                 resource_is_resolved(opt->icon);
 526 }
 527
 528 static bool resource_resolve(struct resource *res, const char *name,
 529                 struct discover_boot_option *opt,
 530                 struct device_handler *handler)
 531 {
 532         struct parser *parser = opt->source;
 533
 534         if (resource_is_resolved(res))
 535                 return true;
 536
 537         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
 538                         opt->option->id, name, parser->name);
 539         parser->resolve_resource(handler, res);
 540
 541         return res->resolved;
 542 }
 543
 544 static bool boot_option_resolve(struct discover_boot_option *opt,
 545                 struct device_handler *handler)
 546 {
 547         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 548                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 549                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 550                 resource_resolve(opt->icon, "icon", opt, handler);
 551 }
 552
 553 static void boot_option_finalise(struct device_handler *handler,
 554                 struct discover_boot_option *opt)
 555 {
 556         assert(boot_option_is_resolved(opt));
 557
 558         /* check that the parsers haven't set any of the final data */
 559         assert(!opt->option->boot_image_file);
 560         assert(!opt->option->initrd_file);
 561         assert(!opt->option->dtb_file);
 562         assert(!opt->option->icon_file);
 563         assert(!opt->option->device_id);
 564
 565         if (opt->boot_image)
 566                 opt->option->boot_image_file = opt->boot_image->url->full;
 567         if (opt->initrd)
 568                 opt->option->initrd_file = opt->initrd->url->full;
 569         if (opt->dtb)
 570                 opt->option->dtb_file = opt->dtb->url->full;
 571         if (opt->icon)
 572                 opt->option->icon_file = opt->icon->url->full;
 573
 574         opt->option->device_id = opt->device->device->id;
 575
 576         if (opt->option->is_default)
 577                 set_default(handler, opt);
 578 }
 579
 580 static void notify_boot_option(struct device_handler *handler,
 581                 struct discover_boot_option *opt)
 582 {
 583         struct discover_device *dev = opt->device;
 584
 585         if (!dev->notified)
 586                 discover_server_notify_device_add(handler->server,
 587                                                   opt->device->device);
 588         dev->notified = true;
 589         discover_server_notify_boot_option_add(handler->server, opt->option);
 590 }
 591
 592 static void process_boot_option_queue(struct device_handler *handler)
 593 {
 594         struct discover_boot_option *opt, *tmp;
 595
 596         list_for_each_entry_safe(&handler->unresolved_boot_options,
 597                         opt, tmp, list) {
 598
 599                 pb_debug("queue: attempting resolution for %s\n",
 600                                 opt->option->id);
 601
 602                 if (!boot_option_resolve(opt, handler))
 603                         continue;
 604
 605                 pb_debug("\tresolved!\n");
 606
 607                 list_remove(&opt->list);
 608                 list_add_tail(&opt->device->boot_options, &opt->list);
 609                 talloc_steal(opt->device, opt);
 610                 boot_option_finalise(handler, opt);
 611                 notify_boot_option(handler, opt);
 612         }
 613 }
 614
 615 struct discover_context *device_handler_discover_context_create(
 616                 struct device_handler *handler,
 617                 struct discover_device *device)
 618 {
 619         struct discover_context *ctx;
 620
 621         ctx = talloc_zero(handler, struct discover_context);
 622         ctx->device = device;
 623         list_init(&ctx->boot_options);
 624
 625         return ctx;
 626 }
 627
 628 /**
 629  * context_commit - Commit a temporary discovery context to the handler,
 630  * and notify the clients about any new options / devices
 631  */
 632 void device_handler_discover_context_commit(struct device_handler *handler,
 633                 struct discover_context *ctx)
 634 {
 635         struct discover_device *dev = ctx->device;
 636         struct discover_boot_option *opt, *tmp;
 637
 638         if (!device_lookup_by_id(handler, dev->device->id))
 639                 device_handler_add_device(handler, dev);
 640
 641         /* move boot options from the context to the device */
 642         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
 643                 list_remove(&opt->list);
 644
 645                 if (boot_option_resolve(opt, handler)) {
 646                         pb_log("boot option %s is resolved, "
 647                                         "sending to clients\n",
 648                                         opt->option->id);
 649                         list_add_tail(&dev->boot_options, &opt->list);
 650                         talloc_steal(dev, opt);
 651                         boot_option_finalise(handler, opt);
 652                         notify_boot_option(handler, opt);
 653                 } else {
 654                         if (!opt->source->resolve_resource) {
 655                                 pb_log("parser %s gave us an unresolved "
 656                                         "resource (%s), but no way to "
 657                                         "resolve it\n",
 658                                         opt->source->name, opt->option->id);
 659                                 talloc_free(opt);
 660                         } else {
 661                                 pb_log("boot option %s is unresolved, "
 662                                                 "adding to queue\n",
 663                                                 opt->option->id);
 664                                 list_add(&handler->unresolved_boot_options,
 665                                                 &opt->list);
 666                                 talloc_steal(handler, opt);
 667                         }
 668                 }
 669         }
 670 }
 671
 672 void device_handler_add_device(struct device_handler *handler,
 673                 struct discover_device *device)
 674 {
 675         handler->n_devices++;
 676         handler->devices = talloc_realloc(handler, handler->devices,
 677                                 struct discover_device *, handler->n_devices);
 678         handler->devices[handler->n_devices - 1] = device;
 679
 680         if (device->device->type == DEVICE_TYPE_NETWORK)
 681                 network_register_device(handler->network, device);
 682 }
 683
 684 /* Start discovery on a hotplugged device. The device will be in our devices
 685  * array, but has only just been initialised by the hotplug source.
 686  */
 687 int device_handler_discover(struct device_handler *handler,
 688                 struct discover_device *dev)
 689 {
 690         struct discover_context *ctx;
 691         int rc;
 692
 693         process_boot_option_queue(handler);
 694
 695         /* create our context */
 696         ctx = device_handler_discover_context_create(handler, dev);
 697
 698         rc = mount_device(dev);
 699         if (rc)
 700                 goto out;
 701
 702         /* add this device to our system info */
 703         system_info_register_blockdev(dev->device->id, dev->uuid,
 704                         dev->mount_path);
 705
 706         /* run the parsers. This will populate the ctx's boot_option list. */
 707         iterate_parsers(ctx);
 708
 709         /* add discovered stuff to the handler */
 710         device_handler_discover_context_commit(handler, ctx);
 711
 712 out:
 713         talloc_free(ctx);
 714
 715         return 0;
 716 }
 717
 718 /* Incoming dhcp event */
 719 int device_handler_dhcp(struct device_handler *handler,
 720                 struct discover_device *dev, struct event *event)
 721 {
 722         struct discover_context *ctx;
 723
 724         /* create our context */
 725         ctx = device_handler_discover_context_create(handler, dev);
 726         ctx->event = event;
 727
 728         iterate_parsers(ctx);
 729
 730         device_handler_discover_context_commit(handler, ctx);
 731
 732         talloc_free(ctx);
 733
 734         return 0;
 735 }
 736
 737 /* incoming conf event */
 738 int device_handler_conf(struct device_handler *handler,
 739                 struct discover_device *dev, struct pb_url *url)
 740 {
 741         struct discover_context *ctx;
 742
 743         /* create our context */
 744         ctx = device_handler_discover_context_create(handler, dev);
 745         ctx->conf_url = url;
 746
 747         iterate_parsers(ctx);
 748
 749         device_handler_discover_context_commit(handler, ctx);
 750
 751         talloc_free(ctx);
 752
 753         return 0;
 754 }
 755
 756 static struct discover_boot_option *find_boot_option_by_id(
 757                 struct device_handler *handler, const char *id)
 758 {
 759         unsigned int i;
 760
 761         for (i = 0; i < handler->n_devices; i++) {
 762                 struct discover_device *dev = handler->devices[i];
 763                 struct discover_boot_option *opt;
 764
 765                 list_for_each_entry(&dev->boot_options, opt, list)
 766                         if (!strcmp(opt->option->id, id))
 767                                 return opt;
 768         }
 769
 770         return NULL;
 771 }
 772
 773 void device_handler_boot(struct device_handler *handler,
 774                 struct boot_command *cmd)
 775 {
 776         struct discover_boot_option *opt = NULL;
 777
 778         if (cmd->option_id && strlen(cmd->option_id))
 779                 opt = find_boot_option_by_id(handler, cmd->option_id);
 780
 781         if (handler->pending_boot)
 782                 boot_cancel(handler->pending_boot);
 783         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
 784                         boot_status, handler);
 785         handler->pending_boot_is_default = false;
 786 }
 787
 788 void device_handler_cancel_default(struct device_handler *handler)
 789 {
 790         struct boot_status status;
 791
 792         if (handler->timeout_waiter)
 793                 waiter_remove(handler->timeout_waiter);
 794
 795         handler->timeout_waiter = NULL;
 796         handler->autoboot_enabled = false;
 797
 798         /* we only send status if we had a default boot option queued */
 799         if (!handler->default_boot_option)
 800                 return;
 801
 802         pb_log("Cancelling default boot option\n");
 803
 804         if (handler->pending_boot && handler->pending_boot_is_default) {
 805                 boot_cancel(handler->pending_boot);
 806                 handler->pending_boot = NULL;
 807                 handler->pending_boot_is_default = false;
 808         }
 809
 810         handler->default_boot_option = NULL;
 811
 812         status.type = BOOT_STATUS_INFO;
 813         status.progress = -1;
 814         status.detail = NULL;
 815         status.message = "Default boot cancelled";
 816
 817         discover_server_notify_boot_status(handler->server, &status);
 818 }
 819
 820 void device_handler_update_config(struct device_handler *handler,
 821                 struct config *config)
 822 {
 823         int rc;
 824
 825         rc = config_set(config);
 826         if (rc)
 827                 return;
 828
 829         discover_server_notify_config(handler->server, config);
 830         device_handler_update_lang(config->lang);
 831         device_handler_reinit(handler);
 832 }
 833
 834 #ifndef PETITBOOT_TEST
 835
 836 static void device_handler_update_lang(const char *lang)
 837 {
 838         const char *cur_lang;
 839
 840         if (!lang)
 841                 return;
 842
 843         cur_lang = setlocale(LC_ALL, NULL);
 844         if (cur_lang && !strcmp(cur_lang, lang))
 845                 return;
 846
 847         setlocale(LC_ALL, lang);
 848 }
 849
 850 static int device_handler_init_sources(struct device_handler *handler)
 851 {
 852         /* init our device sources: udev, network and user events */
 853         handler->udev = udev_init(handler, handler->waitset);
 854         if (!handler->udev)
 855                 return -1;
 856
 857         handler->network = network_init(handler, handler->waitset,
 858                         handler->dry_run);
 859         if (!handler->network)
 860                 return -1;
 861
 862         handler->user_event = user_event_init(handler, handler->waitset);
 863         if (!handler->user_event)
 864                 return -1;
 865
 866         return 0;
 867 }
 868
 869 static void device_handler_reinit_sources(struct device_handler *handler)
 870 {
 871         /* if we haven't initialised sources previously (becuase we started in
 872          * safe mode), then init once here. */
 873         if (!(handler->udev || handler->network || handler->user_event)) {
 874                 device_handler_init_sources(handler);
 875                 return;
 876         }
 877
 878         udev_reinit(handler->udev);
 879
 880         network_shutdown(handler->network);
 881         handler->network = network_init(handler, handler->waitset,
 882                         handler->dry_run);
 883 }
 884
 885 static bool check_existing_mount(struct discover_device *dev)
 886 {
 887         struct stat devstat, mntstat;
 888         struct mntent *mnt;
 889         FILE *fp;
 890         int rc;
 891
 892         rc = stat(dev->device_path, &devstat);
 893         if (rc) {
 894                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
 895                 return false;
 896         }
 897
 898         if (!S_ISBLK(devstat.st_mode)) {
 899                 pb_debug("%s: %s isn't a block device?\n", __func__,
 900                                 dev->device_path);
 901                 return false;
 902         }
 903
 904         fp = fopen("/proc/self/mounts", "r");
 905
 906         for (;;) {
 907                 mnt = getmntent(fp);
 908                 if (!mnt)
 909                         break;
 910
 911                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
 912                         continue;
 913
 914                 rc = stat(mnt->mnt_fsname, &mntstat);
 915                 if (rc)
 916                         continue;
 917
 918                 if (!S_ISBLK(mntstat.st_mode))
 919                         continue;
 920
 921                 if (mntstat.st_rdev == devstat.st_rdev) {
 922                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
 923                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
 924                         dev->mounted = true;
 925                         dev->unmount = false;
 926
 927                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
 928                                         __func__, dev->device_path,
 929                                         dev->mounted_rw ? 'w' : 'o',
 930                                         mnt->mnt_dir);
 931                         break;
 932                 }
 933         }
 934
 935         fclose(fp);
 936
 937         return mnt != NULL;
 938 }
 939
 940 static int mount_device(struct discover_device *dev)
 941 {
 942         const char *fstype;
 943         int rc;
 944
 945         if (!dev->device_path)
 946                 return -1;
 947
 948         if (dev->mounted)
 949                 return 0;
 950
 951         if (check_existing_mount(dev))
 952                 return 0;
 953
 954         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
 955         if (!fstype)
 956                 return 0;
 957
 958         dev->mount_path = join_paths(dev, mount_base(),
 959                                         dev->device_path);
 960
 961         if (pb_mkdir_recursive(dev->mount_path)) {
 962                 pb_log("couldn't create mount directory %s: %s\n",
 963                                 dev->mount_path, strerror(errno));
 964                 goto err_free;
 965         }
 966
 967         pb_log("mounting device %s read-only\n", dev->device_path);
 968         errno = 0;
 969         rc = mount(dev->device_path, dev->mount_path, fstype,
 970                         MS_RDONLY | MS_SILENT, "");
 971         if (!rc) {
 972                 dev->mounted = true;
 973                 dev->mounted_rw = false;
 974                 dev->unmount = true;
 975                 return 0;
 976         }
 977
 978         pb_log("couldn't mount device %s: mount failed: %s\n",
 979                         dev->device_path, strerror(errno));
 980
 981         pb_rmdir_recursive(mount_base(), dev->mount_path);
 982 err_free:
 983         talloc_free(dev->mount_path);
 984         dev->mount_path = NULL;
 985         return -1;
 986 }
 987
 988 static int umount_device(struct discover_device *dev)
 989 {
 990         int rc;
 991
 992         if (!dev->mounted || !dev->unmount)
 993                 return 0;
 994
 995         pb_log("unmounting device %s\n", dev->device_path);
 996         rc = umount(dev->mount_path);
 997         if (rc)
 998                 return -1;
 999
1000         dev->mounted = false;
1001
1002         pb_rmdir_recursive(mount_base(), dev->mount_path);
1003
1004         talloc_free(dev->mount_path);
1005         dev->mount_path = NULL;
1006
1007         return 0;
1008 }
1009
1010 int device_request_write(struct discover_device *dev, bool *release)
1011 {
1012         int rc;
1013
1014         *release = false;
1015
1016         if (!dev->mounted)
1017                 return -1;
1018
1019         if (dev->mounted_rw)
1020                 return 0;
1021
1022         pb_log("remounting device %s read-write\n", dev->device_path);
1023         rc = mount(dev->device_path, dev->mount_path, "",
1024                         MS_REMOUNT | MS_SILENT, "");
1025         if (rc)
1026                 return -1;
1027
1028         dev->mounted_rw = true;
1029         *release = true;
1030         return 0;
1031 }
1032
1033 void device_release_write(struct discover_device *dev, bool release)
1034 {
1035         if (!release)
1036                 return;
1037
1038         pb_log("remounting device %s read-only\n", dev->device_path);
1039         mount(dev->device_path, dev->mount_path, "",
1040                         MS_REMOUNT | MS_RDONLY | MS_SILENT, "");
1041         dev->mounted_rw = false;
1042 }
1043
1044 #else
1045
1046 static void device_handler_update_lang(const char *lang __attribute__((unused)))
1047 {
1048 }
1049
1050 static int device_handler_init_sources(
1051                 struct device_handler *handler __attribute__((unused)))
1052 {
1053         return 0;
1054 }
1055
1056 static void device_handler_reinit_sources(
1057                 struct device_handler *handler __attribute__((unused)))
1058 {
1059 }
1060
1061 static int umount_device(struct discover_device *dev __attribute__((unused)))
1062 {
1063         return 0;
1064 }
1065
1066 static int __attribute__((unused)) mount_device(
1067                 struct discover_device *dev __attribute__((unused)))
1068 {
1069         return 0;
1070 }
1071
1072 int device_request_write(struct discover_device *dev __attribute__((unused)),
1073                 bool *release)
1074 {
1075         *release = true;
1076         return 0;
1077 }
1078
1079 void device_release_write(struct discover_device *dev __attribute__((unused)),
1080         bool release __attribute__((unused)))
1081 {
1082 }
1083
1084 #endif
1085