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 <locale.h>
   9 #include <sys/stat.h>
  10 #include <sys/wait.h>
  11 #include <sys/mount.h>
  12
  13 #include <talloc/talloc.h>
  14 #include <list/list.h>
  15 #include <log/log.h>
  16 #include <types/types.h>
  17 #include <system/system.h>
  18 #include <process/process.h>
  19 #include <url/url.h>
  20 #include <i18n/i18n.h>
  21
  22 #include <sys/types.h>
  23 #include <sys/socket.h>
  24 #include <netdb.h>
  25 #include <arpa/inet.h>
  26
  27 #include "device-handler.h"
  28 #include "discover-server.h"
  29 #include "devmapper.h"
  30 #include "user-event.h"
  31 #include "platform.h"
  32 #include "event.h"
  33 #include "parser.h"
  34 #include "resource.h"
  35 #include "paths.h"
  36 #include "sysinfo.h"
  37 #include "boot.h"
  38 #include "udev.h"
  39 #include "network.h"
  40 #include "ipmi.h"
  41
  42 enum default_priority {
  43         DEFAULT_PRIORITY_REMOTE         = 1,
  44         DEFAULT_PRIORITY_LOCAL_FIRST    = 2,
  45         DEFAULT_PRIORITY_LOCAL_LAST     = 0xfe,
  46         DEFAULT_PRIORITY_DISABLED       = 0xff,
  47 };
  48
  49 struct device_handler {
  50         struct discover_server  *server;
  51         int                     dry_run;
  52
  53         struct pb_udev          *udev;
  54         struct network          *network;
  55         struct user_event       *user_event;
  56
  57         struct discover_device  **devices;
  58         unsigned int            n_devices;
  59
  60         struct ramdisk_device   **ramdisks;
  61         unsigned int            n_ramdisks;
  62
  63         struct waitset          *waitset;
  64         struct waiter           *timeout_waiter;
  65         bool                    autoboot_enabled;
  66         unsigned int            sec_to_boot;
  67
  68         struct discover_boot_option *default_boot_option;
  69         int                     default_boot_option_priority;
  70
  71         struct list             unresolved_boot_options;
  72
  73         struct boot_task        *pending_boot;
  74         bool                    pending_boot_is_default;
  75 };
  76
  77 static int mount_device(struct discover_device *dev);
  78 static int umount_device(struct discover_device *dev);
  79
  80 static int device_handler_init_sources(struct device_handler *handler);
  81 static void device_handler_reinit_sources(struct device_handler *handler);
  82
  83 static void device_handler_update_lang(const char *lang);
  84
  85 void discover_context_add_boot_option(struct discover_context *ctx,
  86                 struct discover_boot_option *boot_option)
  87 {
  88         boot_option->source = ctx->parser;
  89         list_add_tail(&ctx->boot_options, &boot_option->list);
  90         talloc_steal(ctx, boot_option);
  91 }
  92
  93 /**
  94  * device_handler_get_device_count - Get the count of current handler devices.
  95  */
  96
  97 int device_handler_get_device_count(const struct device_handler *handler)
  98 {
  99         return handler->n_devices;
 100 }
 101
 102 /**
 103  * device_handler_get_device - Get a handler device by index.
 104  */
 105
 106 const struct discover_device *device_handler_get_device(
 107         const struct device_handler *handler, unsigned int index)
 108 {
 109         if (index >= handler->n_devices) {
 110                 assert(0 && "bad index");
 111                 return NULL;
 112         }
 113
 114         return handler->devices[index];
 115 }
 116
 117 struct discover_boot_option *discover_boot_option_create(
 118                 struct discover_context *ctx,
 119                 struct discover_device *device)
 120 {
 121         struct discover_boot_option *opt;
 122
 123         opt = talloc_zero(ctx, struct discover_boot_option);
 124         opt->option = talloc_zero(opt, struct boot_option);
 125         opt->device = device;
 126
 127         return opt;
 128 }
 129
 130 static int device_match_uuid(struct discover_device *dev, const char *uuid)
 131 {
 132         return dev->uuid && !strcmp(dev->uuid, uuid);
 133 }
 134
 135 static int device_match_label(struct discover_device *dev, const char *label)
 136 {
 137         return dev->label && !strcmp(dev->label, label);
 138 }
 139
 140 static int device_match_id(struct discover_device *dev, const char *id)
 141 {
 142         return !strcmp(dev->device->id, id);
 143 }
 144
 145 static int device_match_serial(struct discover_device *dev, const char *serial)
 146 {
 147         const char *val = discover_device_get_param(dev, "ID_SERIAL");
 148         return val && !strcmp(val, serial);
 149 }
 150
 151 static struct discover_device *device_lookup(
 152                 struct device_handler *device_handler,
 153                 int (match_fn)(struct discover_device *, const char *),
 154                 const char *str)
 155 {
 156         struct discover_device *dev;
 157         unsigned int i;
 158
 159         if (!str)
 160                 return NULL;
 161
 162         for (i = 0; i < device_handler->n_devices; i++) {
 163                 dev = device_handler->devices[i];
 164
 165                 if (match_fn(dev, str))
 166                         return dev;
 167         }
 168
 169         return NULL;
 170 }
 171
 172 struct discover_device *device_lookup_by_name(struct device_handler *handler,
 173                 const char *name)
 174 {
 175         if (!strncmp(name, "/dev/", strlen("/dev/")))
 176                 name += strlen("/dev/");
 177
 178         return device_lookup_by_id(handler, name);
 179 }
 180
 181 struct discover_device *device_lookup_by_uuid(
 182                 struct device_handler *device_handler,
 183                 const char *uuid)
 184 {
 185         return device_lookup(device_handler, device_match_uuid, uuid);
 186 }
 187
 188 struct discover_device *device_lookup_by_label(
 189                 struct device_handler *device_handler,
 190                 const char *label)
 191 {
 192         return device_lookup(device_handler, device_match_label, label);
 193 }
 194
 195 struct discover_device *device_lookup_by_id(
 196                 struct device_handler *device_handler,
 197                 const char *id)
 198 {
 199         return device_lookup(device_handler, device_match_id, id);
 200 }
 201
 202 struct discover_device *device_lookup_by_serial(
 203                 struct device_handler *device_handler,
 204                 const char *serial)
 205 {
 206         return device_lookup(device_handler, device_match_serial, serial);
 207 }
 208
 209 void device_handler_destroy(struct device_handler *handler)
 210 {
 211         talloc_free(handler);
 212 }
 213
 214 static int destroy_device(void *arg)
 215 {
 216         struct discover_device *dev = arg;
 217
 218         umount_device(dev);
 219
 220         return 0;
 221 }
 222
 223 struct discover_device *discover_device_create(struct device_handler *handler,
 224                 const char *id)
 225 {
 226         struct discover_device *dev;
 227
 228         dev = device_lookup_by_id(handler, id);
 229         if (dev)
 230                 return dev;
 231
 232         dev = talloc_zero(handler, struct discover_device);
 233         dev->device = talloc_zero(dev, struct device);
 234         dev->device->id = talloc_strdup(dev->device, id);
 235         list_init(&dev->params);
 236         list_init(&dev->boot_options);
 237
 238         talloc_set_destructor(dev, destroy_device);
 239
 240         return dev;
 241 }
 242
 243 struct discover_device_param {
 244         char                    *name;
 245         char                    *value;
 246         struct list_item        list;
 247 };
 248
 249 void discover_device_set_param(struct discover_device *device,
 250                 const char *name, const char *value)
 251 {
 252         struct discover_device_param *param;
 253         bool found = false;
 254
 255         list_for_each_entry(&device->params, param, list) {
 256                 if (!strcmp(param->name, name)) {
 257                         found = true;
 258                         break;
 259                 }
 260         }
 261
 262         if (!found) {
 263                 if (!value)
 264                         return;
 265                 param = talloc(device, struct discover_device_param);
 266                 param->name = talloc_strdup(param, name);
 267                 list_add(&device->params, &param->list);
 268         } else {
 269                 if (!value) {
 270                         list_remove(&param->list);
 271                         talloc_free(param);
 272                         return;
 273                 }
 274                 talloc_free(param->value);
 275         }
 276
 277         param->value = talloc_strdup(param, value);
 278 }
 279
 280 const char *discover_device_get_param(struct discover_device *device,
 281                 const char *name)
 282 {
 283         struct discover_device_param *param;
 284
 285         list_for_each_entry(&device->params, param, list) {
 286                 if (!strcmp(param->name, name))
 287                         return param->value;
 288         }
 289         return NULL;
 290 }
 291
 292 struct device_handler *device_handler_init(struct discover_server *server,
 293                 struct waitset *waitset, int dry_run)
 294 {
 295         struct device_handler *handler;
 296         int rc;
 297
 298         handler = talloc_zero(NULL, struct device_handler);
 299         handler->server = server;
 300         handler->waitset = waitset;
 301         handler->dry_run = dry_run;
 302         handler->autoboot_enabled = config_get()->autoboot_enabled;
 303
 304         list_init(&handler->unresolved_boot_options);
 305
 306         /* set up our mount point base */
 307         pb_mkdir_recursive(mount_base());
 308
 309         parser_init();
 310
 311         if (config_get()->safe_mode)
 312                 return handler;
 313
 314         rc = device_handler_init_sources(handler);
 315         if (rc) {
 316                 talloc_free(handler);
 317                 return NULL;
 318         }
 319
 320         return handler;
 321 }
 322
 323 void device_handler_reinit(struct device_handler *handler)
 324 {
 325         struct discover_boot_option *opt, *tmp;
 326         struct ramdisk_device *ramdisk;
 327         unsigned int i;
 328
 329         device_handler_cancel_default(handler);
 330
 331         /* free unresolved boot options */
 332         list_for_each_entry_safe(&handler->unresolved_boot_options,
 333                         opt, tmp, list)
 334                 talloc_free(opt);
 335         list_init(&handler->unresolved_boot_options);
 336
 337         /* drop all devices */
 338         for (i = 0; i < handler->n_devices; i++) {
 339                 discover_server_notify_device_remove(handler->server,
 340                                 handler->devices[i]->device);
 341                 ramdisk = handler->devices[i]->ramdisk;
 342                 talloc_free(handler->devices[i]);
 343                 talloc_free(ramdisk);
 344         }
 345
 346         talloc_free(handler->devices);
 347         handler->devices = NULL;
 348         handler->n_devices = 0;
 349         talloc_free(handler->ramdisks);
 350         handler->ramdisks = NULL;
 351         handler->n_ramdisks = 0;
 352
 353         device_handler_reinit_sources(handler);
 354 }
 355
 356 void device_handler_remove(struct device_handler *handler,
 357                 struct discover_device *device)
 358 {
 359         struct discover_boot_option *opt, *tmp;
 360         unsigned int i;
 361
 362         for (i = 0; i < handler->n_devices; i++)
 363                 if (handler->devices[i] == device)
 364                         break;
 365
 366         if (i == handler->n_devices) {
 367                 talloc_free(device);
 368                 return;
 369         }
 370
 371         /* Free any unresolved options, as they're currently allocated
 372          * against the handler */
 373         list_for_each_entry_safe(&handler->unresolved_boot_options,
 374                         opt, tmp, list) {
 375                 if (opt->device != device)
 376                         continue;
 377                 list_remove(&opt->list);
 378                 talloc_free(opt);
 379         }
 380
 381         /* if this is a network device, we have to unregister it from the
 382          * network code */
 383         if (device->device->type == DEVICE_TYPE_NETWORK)
 384                 network_unregister_device(handler->network, device);
 385
 386         handler->n_devices--;
 387         memmove(&handler->devices[i], &handler->devices[i + 1],
 388                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 389         handler->devices = talloc_realloc(handler, handler->devices,
 390                 struct discover_device *, handler->n_devices);
 391
 392         if (device->notified)
 393                 discover_server_notify_device_remove(handler->server,
 394                                                         device->device);
 395
 396         talloc_free(device);
 397 }
 398
 399 static void boot_status(void *arg, struct boot_status *status)
 400 {
 401         struct device_handler *handler = arg;
 402
 403         discover_server_notify_boot_status(handler->server, status);
 404 }
 405
 406 static void countdown_status(struct device_handler *handler,
 407                 struct discover_boot_option *opt, unsigned int sec)
 408 {
 409         struct boot_status status;
 410
 411         status.type = BOOT_STATUS_INFO;
 412         status.progress = -1;
 413         status.detail = NULL;
 414         status.message = talloc_asprintf(handler,
 415                         _("Booting in %d sec: %s"), sec, opt->option->name);
 416
 417         discover_server_notify_boot_status(handler->server, &status);
 418
 419         talloc_free(status.message);
 420 }
 421
 422 static int default_timeout(void *arg)
 423 {
 424         struct device_handler *handler = arg;
 425         struct discover_boot_option *opt;
 426
 427         if (!handler->default_boot_option)
 428                 return 0;
 429
 430         if (handler->pending_boot)
 431                 return 0;
 432
 433         opt = handler->default_boot_option;
 434
 435         if (handler->sec_to_boot) {
 436                 countdown_status(handler, opt, handler->sec_to_boot);
 437                 handler->sec_to_boot--;
 438                 handler->timeout_waiter = waiter_register_timeout(
 439                                                 handler->waitset, 1000,
 440                                                 default_timeout, handler);
 441                 return 0;
 442         }
 443
 444         handler->timeout_waiter = NULL;
 445
 446         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 447
 448         platform_pre_boot();
 449
 450         handler->pending_boot = boot(handler, handler->default_boot_option,
 451                         NULL, handler->dry_run, boot_status, handler);
 452         handler->pending_boot_is_default = true;
 453         return 0;
 454 }
 455
 456 struct {
 457         enum ipmi_bootdev       ipmi_type;
 458         enum device_type        device_type;
 459 } device_type_map[] = {
 460         { IPMI_BOOTDEV_NETWORK, DEVICE_TYPE_NETWORK },
 461         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_DISK },
 462         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_USB },
 463         { IPMI_BOOTDEV_CDROM, DEVICE_TYPE_OPTICAL },
 464 };
 465
 466 static bool ipmi_device_type_matches(enum ipmi_bootdev ipmi_type,
 467                 enum device_type device_type)
 468 {
 469         unsigned int i;
 470
 471         for (i = 0; i < ARRAY_SIZE(device_type_map); i++) {
 472                 if (device_type_map[i].device_type == device_type)
 473                         return device_type_map[i].ipmi_type == ipmi_type;
 474         }
 475
 476         return false;
 477 }
 478
 479 static int autoboot_option_priority(const struct config *config,
 480                                 struct discover_boot_option *opt)
 481 {
 482         enum device_type type = opt->device->device->type;
 483         const char *uuid = opt->device->uuid;
 484         struct autoboot_option *auto_opt;
 485         unsigned int i;
 486
 487         for (i = 0; i < config->n_autoboot_opts; i++) {
 488                 auto_opt = &config->autoboot_opts[i];
 489                 if (auto_opt->boot_type == BOOT_DEVICE_UUID)
 490                         if (!strcmp(auto_opt->uuid, uuid))
 491                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 492
 493                 if (auto_opt->boot_type == BOOT_DEVICE_TYPE)
 494                         if (auto_opt->type == type ||
 495                             auto_opt->type == DEVICE_TYPE_ANY)
 496                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 497         }
 498
 499         return -1;
 500 }
 501
 502 /*
 503  * We have different priorities to resolve conflicts between boot options that
 504  * report to be the default for their device. This function assigns a priority
 505  * for these options.
 506  */
 507 static enum default_priority default_option_priority(
 508                 struct discover_boot_option *opt)
 509 {
 510         const struct config *config;
 511
 512         config = config_get();
 513
 514         /* We give highest priority to IPMI-configured boot options. If
 515          * we have an IPMI bootdev configuration set, then we don't allow
 516          * any other defaults */
 517         if (config->ipmi_bootdev) {
 518                 bool ipmi_match = ipmi_device_type_matches(config->ipmi_bootdev,
 519                                 opt->device->device->type);
 520                 if (ipmi_match)
 521                         return DEFAULT_PRIORITY_REMOTE;
 522
 523                 pb_debug("handler: disabled default priority due to "
 524                                 "non-matching IPMI type %x\n",
 525                                 config->ipmi_bootdev);
 526                 return DEFAULT_PRIORITY_DISABLED;
 527         }
 528
 529         /* Next, try to match the option against the user-defined autoboot
 530          * options, either by device UUID or type. */
 531         if (config->n_autoboot_opts) {
 532                 int boot_match = autoboot_option_priority(config, opt);
 533                 if (boot_match > 0)
 534                         return boot_match;
 535         }
 536
 537         /* If the option didn't match any entry in the array, it is disabled */
 538         pb_debug("handler: disabled default priority due to "
 539                         "non-matching UUID or type\n");
 540         return DEFAULT_PRIORITY_DISABLED;
 541 }
 542
 543 static void set_default(struct device_handler *handler,
 544                 struct discover_boot_option *opt)
 545 {
 546         enum default_priority cur_prio, new_prio;
 547
 548         if (!handler->autoboot_enabled)
 549                 return;
 550
 551         pb_debug("handler: new default option: %s\n", opt->option->id);
 552
 553         new_prio = default_option_priority(opt);
 554
 555         /* Anything outside our range prevents a default boot */
 556         if (new_prio >= DEFAULT_PRIORITY_DISABLED)
 557                 return;
 558
 559         pb_debug("handler: calculated priority %d\n", new_prio);
 560
 561         /* Resolve any conflicts: if we have a new default option, it only
 562          * replaces the current if it has a higher priority. */
 563         if (handler->default_boot_option) {
 564
 565                 cur_prio = handler->default_boot_option_priority;
 566
 567                 if (new_prio < cur_prio) {
 568                         pb_log("handler: new prio %d beats "
 569                                         "old prio %d for %s\n",
 570                                         new_prio, cur_prio,
 571                                         handler->default_boot_option
 572                                                 ->option->id);
 573                         handler->default_boot_option = opt;
 574                         handler->default_boot_option_priority = new_prio;
 575                         /* extend the timeout a little, so the user sees some
 576                          * indication of the change */
 577                         handler->sec_to_boot += 2;
 578                 }
 579
 580                 return;
 581         }
 582
 583         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 584         handler->default_boot_option = opt;
 585         handler->default_boot_option_priority = new_prio;
 586
 587         pb_log("handler: boot option %s set as default, timeout %u sec.\n",
 588                opt->option->id, handler->sec_to_boot);
 589
 590         default_timeout(handler);
 591 }
 592
 593 static bool resource_is_resolved(struct resource *res)
 594 {
 595         return !res || res->resolved;
 596 }
 597
 598 /* We only use this in an assert, which will disappear if we're compiling
 599  * with NDEBUG, so we need the 'used' attribute for these builds */
 600 static bool __attribute__((used)) boot_option_is_resolved(
 601                 struct discover_boot_option *opt)
 602 {
 603         return resource_is_resolved(opt->boot_image) &&
 604                 resource_is_resolved(opt->initrd) &&
 605                 resource_is_resolved(opt->dtb) &&
 606                 resource_is_resolved(opt->icon);
 607 }
 608
 609 static bool resource_resolve(struct resource *res, const char *name,
 610                 struct discover_boot_option *opt,
 611                 struct device_handler *handler)
 612 {
 613         struct parser *parser = opt->source;
 614
 615         if (resource_is_resolved(res))
 616                 return true;
 617
 618         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
 619                         opt->option->id, name, parser->name);
 620         parser->resolve_resource(handler, res);
 621
 622         return res->resolved;
 623 }
 624
 625 static bool boot_option_resolve(struct discover_boot_option *opt,
 626                 struct device_handler *handler)
 627 {
 628         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 629                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 630                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 631                 resource_resolve(opt->icon, "icon", opt, handler);
 632 }
 633
 634 static void boot_option_finalise(struct device_handler *handler,
 635                 struct discover_boot_option *opt)
 636 {
 637         assert(boot_option_is_resolved(opt));
 638
 639         /* check that the parsers haven't set any of the final data */
 640         assert(!opt->option->boot_image_file);
 641         assert(!opt->option->initrd_file);
 642         assert(!opt->option->dtb_file);
 643         assert(!opt->option->icon_file);
 644         assert(!opt->option->device_id);
 645
 646         if (opt->boot_image)
 647                 opt->option->boot_image_file = opt->boot_image->url->full;
 648         if (opt->initrd)
 649                 opt->option->initrd_file = opt->initrd->url->full;
 650         if (opt->dtb)
 651                 opt->option->dtb_file = opt->dtb->url->full;
 652         if (opt->icon)
 653                 opt->option->icon_file = opt->icon->url->full;
 654
 655         opt->option->device_id = opt->device->device->id;
 656
 657         if (opt->option->is_default)
 658                 set_default(handler, opt);
 659 }
 660
 661 static void notify_boot_option(struct device_handler *handler,
 662                 struct discover_boot_option *opt)
 663 {
 664         struct discover_device *dev = opt->device;
 665
 666         if (!dev->notified)
 667                 discover_server_notify_device_add(handler->server,
 668                                                   opt->device->device);
 669         dev->notified = true;
 670         discover_server_notify_boot_option_add(handler->server, opt->option);
 671 }
 672
 673 static void process_boot_option_queue(struct device_handler *handler)
 674 {
 675         struct discover_boot_option *opt, *tmp;
 676
 677         list_for_each_entry_safe(&handler->unresolved_boot_options,
 678                         opt, tmp, list) {
 679
 680                 pb_debug("queue: attempting resolution for %s\n",
 681                                 opt->option->id);
 682
 683                 if (!boot_option_resolve(opt, handler))
 684                         continue;
 685
 686                 pb_debug("\tresolved!\n");
 687
 688                 list_remove(&opt->list);
 689                 list_add_tail(&opt->device->boot_options, &opt->list);
 690                 talloc_steal(opt->device, opt);
 691                 boot_option_finalise(handler, opt);
 692                 notify_boot_option(handler, opt);
 693         }
 694 }
 695
 696 struct discover_context *device_handler_discover_context_create(
 697                 struct device_handler *handler,
 698                 struct discover_device *device)
 699 {
 700         struct discover_context *ctx;
 701
 702         ctx = talloc_zero(handler, struct discover_context);
 703         ctx->device = device;
 704         ctx->network = handler->network;
 705         list_init(&ctx->boot_options);
 706
 707         return ctx;
 708 }
 709
 710 /**
 711  * context_commit - Commit a temporary discovery context to the handler,
 712  * and notify the clients about any new options / devices
 713  */
 714 void device_handler_discover_context_commit(struct device_handler *handler,
 715                 struct discover_context *ctx)
 716 {
 717         struct discover_device *dev = ctx->device;
 718         struct discover_boot_option *opt, *tmp;
 719
 720         if (!device_lookup_by_id(handler, dev->device->id))
 721                 device_handler_add_device(handler, dev);
 722
 723         /* move boot options from the context to the device */
 724         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
 725                 list_remove(&opt->list);
 726
 727                 if (boot_option_resolve(opt, handler)) {
 728                         pb_log("boot option %s is resolved, "
 729                                         "sending to clients\n",
 730                                         opt->option->id);
 731                         list_add_tail(&dev->boot_options, &opt->list);
 732                         talloc_steal(dev, opt);
 733                         boot_option_finalise(handler, opt);
 734                         notify_boot_option(handler, opt);
 735                 } else {
 736                         if (!opt->source->resolve_resource) {
 737                                 pb_log("parser %s gave us an unresolved "
 738                                         "resource (%s), but no way to "
 739                                         "resolve it\n",
 740                                         opt->source->name, opt->option->id);
 741                                 talloc_free(opt);
 742                         } else {
 743                                 pb_log("boot option %s is unresolved, "
 744                                                 "adding to queue\n",
 745                                                 opt->option->id);
 746                                 list_add(&handler->unresolved_boot_options,
 747                                                 &opt->list);
 748                                 talloc_steal(handler, opt);
 749                         }
 750                 }
 751         }
 752 }
 753
 754 void device_handler_add_device(struct device_handler *handler,
 755                 struct discover_device *device)
 756 {
 757         handler->n_devices++;
 758         handler->devices = talloc_realloc(handler, handler->devices,
 759                                 struct discover_device *, handler->n_devices);
 760         handler->devices[handler->n_devices - 1] = device;
 761
 762         if (device->device->type == DEVICE_TYPE_NETWORK)
 763                 network_register_device(handler->network, device);
 764 }
 765
 766 void device_handler_add_ramdisk(struct device_handler *handler,
 767                 const char *path)
 768 {
 769         struct ramdisk_device *dev;
 770         unsigned int i;
 771
 772         if (!path)
 773                 return;
 774
 775         for (i = 0; i < handler->n_ramdisks; i++)
 776                 if (!strcmp(handler->ramdisks[i]->path, path))
 777                         return;
 778
 779         dev = talloc_zero(handler, struct ramdisk_device);
 780         if (!dev) {
 781                 pb_log("Failed to allocate memory to track %s\n", path);
 782                 return;
 783         }
 784
 785         dev->path = talloc_strdup(handler, path);
 786
 787         handler->ramdisks = talloc_realloc(handler, handler->ramdisks,
 788                                 struct ramdisk_device *,
 789                                 handler->n_ramdisks + 1);
 790         if (!handler->ramdisks) {
 791                 pb_log("Failed to reallocate memory"
 792                        "- ramdisk tracking inconsistent!\n");
 793                 return;
 794         }
 795
 796         handler->ramdisks[i] = dev;
 797         i = handler->n_ramdisks++;
 798 }
 799
 800 struct ramdisk_device *device_handler_get_ramdisk(
 801                 struct device_handler *handler)
 802 {
 803         unsigned int i;
 804         char *name;
 805         dev_t id;
 806
 807         /* Check if free ramdisk exists */
 808         for (i = 0; i < handler->n_ramdisks; i++)
 809                 if (!handler->ramdisks[i]->snapshot &&
 810                     !handler->ramdisks[i]->origin &&
 811                     !handler->ramdisks[i]->base)
 812                         return handler->ramdisks[i];
 813
 814         /* Otherwise create a new one */
 815         name = talloc_asprintf(handler, "/dev/ram%d",
 816                         handler->n_ramdisks);
 817         if (!name) {
 818                 pb_debug("Failed to allocate memory to name /dev/ram%d",
 819                         handler->n_ramdisks);
 820                 return NULL;
 821         }
 822
 823         id = makedev(1, handler->n_ramdisks);
 824         if (mknod(name, S_IFBLK, id)) {
 825                 if (errno == EEXIST) {
 826                         /* We haven't yet received updates for existing
 827                          * ramdisks - add and use this one */
 828                         pb_debug("Using untracked ramdisk %s\n", name);
 829                 } else {
 830                         pb_log("Failed to create new ramdisk %s: %s\n",
 831                                name, strerror(errno));
 832                         return NULL;
 833                 }
 834         }
 835         device_handler_add_ramdisk(handler, name);
 836         talloc_free(name);
 837
 838         return handler->ramdisks[i];
 839 }
 840
 841 void device_handler_release_ramdisk(struct discover_device *device)
 842 {
 843         struct ramdisk_device *ramdisk = device->ramdisk;
 844
 845         talloc_free(ramdisk->snapshot);
 846         talloc_free(ramdisk->origin);
 847         talloc_free(ramdisk->base);
 848
 849         ramdisk->snapshot = ramdisk->origin = ramdisk->base = NULL;
 850         ramdisk->sectors = 0;
 851
 852         device->ramdisk = NULL;
 853 }
 854
 855 /* Start discovery on a hotplugged device. The device will be in our devices
 856  * array, but has only just been initialised by the hotplug source.
 857  */
 858 int device_handler_discover(struct device_handler *handler,
 859                 struct discover_device *dev)
 860 {
 861         struct discover_context *ctx;
 862         struct boot_status *status;
 863         int rc;
 864
 865         status = talloc_zero(handler, struct boot_status);
 866         status->type = BOOT_STATUS_INFO;
 867         /*
 868          * TRANSLATORS: this string will be passed the type and identifier
 869          * of the device. For example, the first parameter could be "Disk",
 870          * (which will be translated accordingly) and the second a Linux device
 871          * identifier like 'sda1' (which will not be translated)
 872          */
 873         status->message = talloc_asprintf(status, _("Processing %s device %s"),
 874                                 device_type_display_name(dev->device->type),
 875                                 dev->device->id);
 876         boot_status(handler, status);
 877
 878         process_boot_option_queue(handler);
 879
 880         /* create our context */
 881         ctx = device_handler_discover_context_create(handler, dev);
 882
 883         rc = mount_device(dev);
 884         if (rc)
 885                 goto out;
 886
 887         /* add this device to our system info */
 888         system_info_register_blockdev(dev->device->id, dev->uuid,
 889                         dev->mount_path);
 890
 891         /* run the parsers. This will populate the ctx's boot_option list. */
 892         iterate_parsers(ctx);
 893
 894         /* add discovered stuff to the handler */
 895         device_handler_discover_context_commit(handler, ctx);
 896
 897 out:
 898         /*
 899          * TRANSLATORS: the format specifier in this string is a Linux
 900          * device identifier, like 'sda1'
 901          */
 902         status->message = talloc_asprintf(status,_("Processing %s complete"),
 903                                 dev->device->id);
 904         boot_status(handler, status);
 905
 906         talloc_free(status);
 907         talloc_free(ctx);
 908
 909         return 0;
 910 }
 911
 912 /* Incoming dhcp event */
 913 int device_handler_dhcp(struct device_handler *handler,
 914                 struct discover_device *dev, struct event *event)
 915 {
 916         struct discover_context *ctx;
 917         struct boot_status *status;
 918
 919         status = talloc_zero(handler, struct boot_status);
 920         status->type = BOOT_STATUS_INFO;
 921         /*
 922          * TRANSLATORS: this format specifier will be the name of a network
 923          * device, like 'eth0'.
 924          */
 925         status->message = talloc_asprintf(status, _("Processing dhcp event on %s"),
 926                                 dev->device->id);
 927         boot_status(handler, status);
 928
 929         /* create our context */
 930         ctx = device_handler_discover_context_create(handler, dev);
 931         ctx->event = event;
 932
 933         iterate_parsers(ctx);
 934
 935         device_handler_discover_context_commit(handler, ctx);
 936
 937         /*
 938          * TRANSLATORS: this format specifier will be the name of a network
 939          * device, like 'eth0'.
 940          */
 941         status->message = talloc_asprintf(status,_("Processing %s complete"),
 942                                 dev->device->id);
 943         boot_status(handler, status);
 944
 945         talloc_free(status);
 946         talloc_free(ctx);
 947
 948         return 0;
 949 }
 950
 951 /* incoming conf event */
 952 int device_handler_conf(struct device_handler *handler,
 953                 struct discover_device *dev, struct pb_url *url)
 954 {
 955         struct discover_context *ctx;
 956         struct boot_status *status;
 957
 958         status = talloc_zero(handler, struct boot_status);
 959         status->type = BOOT_STATUS_INFO;
 960         status->message = talloc_asprintf(status, _("Processing user config"));
 961         boot_status(handler, status);
 962
 963         /* create our context */
 964         ctx = device_handler_discover_context_create(handler, dev);
 965         ctx->conf_url = url;
 966
 967         iterate_parsers(ctx);
 968
 969         device_handler_discover_context_commit(handler, ctx);
 970
 971         status->message = talloc_asprintf(status,
 972                                 _("Processing user config complete"));
 973         boot_status(handler, status);
 974
 975         talloc_free(status);
 976         talloc_free(ctx);
 977
 978         return 0;
 979 }
 980
 981 static struct discover_boot_option *find_boot_option_by_id(
 982                 struct device_handler *handler, const char *id)
 983 {
 984         unsigned int i;
 985
 986         for (i = 0; i < handler->n_devices; i++) {
 987                 struct discover_device *dev = handler->devices[i];
 988                 struct discover_boot_option *opt;
 989
 990                 list_for_each_entry(&dev->boot_options, opt, list)
 991                         if (!strcmp(opt->option->id, id))
 992                                 return opt;
 993         }
 994
 995         return NULL;
 996 }
 997
 998 void device_handler_boot(struct device_handler *handler,
 999                 struct boot_command *cmd)
1000 {
1001         struct discover_boot_option *opt = NULL;
1002
1003         if (cmd->option_id && strlen(cmd->option_id))
1004                 opt = find_boot_option_by_id(handler, cmd->option_id);
1005
1006         if (handler->pending_boot)
1007                 boot_cancel(handler->pending_boot);
1008
1009         platform_pre_boot();
1010
1011         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
1012                         boot_status, handler);
1013         handler->pending_boot_is_default = false;
1014 }
1015
1016 void device_handler_cancel_default(struct device_handler *handler)
1017 {
1018         struct boot_status status;
1019
1020         if (handler->timeout_waiter)
1021                 waiter_remove(handler->timeout_waiter);
1022
1023         handler->timeout_waiter = NULL;
1024         handler->autoboot_enabled = false;
1025
1026         /* we only send status if we had a default boot option queued */
1027         if (!handler->default_boot_option)
1028                 return;
1029
1030         pb_log("Cancelling default boot option\n");
1031
1032         if (handler->pending_boot && handler->pending_boot_is_default) {
1033                 boot_cancel(handler->pending_boot);
1034                 handler->pending_boot = NULL;
1035                 handler->pending_boot_is_default = false;
1036         }
1037
1038         handler->default_boot_option = NULL;
1039
1040         status.type = BOOT_STATUS_INFO;
1041         status.progress = -1;
1042         status.detail = NULL;
1043         status.message = _("Default boot cancelled");
1044
1045         discover_server_notify_boot_status(handler->server, &status);
1046 }
1047
1048 void device_handler_update_config(struct device_handler *handler,
1049                 struct config *config)
1050 {
1051         int rc;
1052
1053         rc = config_set(config);
1054         if (rc)
1055                 return;
1056
1057         discover_server_notify_config(handler->server, config);
1058         device_handler_update_lang(config->lang);
1059         device_handler_reinit(handler);
1060 }
1061
1062 static char *device_from_addr(void *ctx, struct pb_url *url)
1063 {
1064         char *ipaddr, *buf, *tok, *dev = NULL;
1065         const char *delim = " ";
1066         struct sockaddr_in *ip;
1067         struct sockaddr_in si;
1068         struct addrinfo *res;
1069         struct process *p;
1070         int rc;
1071
1072         /* Note: IPv4 only */
1073         rc = inet_pton(AF_INET, url->host, &(si.sin_addr));
1074         if (rc > 0) {
1075                 ipaddr = url->host;
1076         } else {
1077                 /* need to turn hostname into a valid IP */
1078                 rc = getaddrinfo(url->host, NULL, NULL, &res);
1079                 if (rc) {
1080                         pb_debug("%s: Invalid URL\n",__func__);
1081                         return NULL;
1082                 }
1083                 ipaddr = talloc_array(ctx,char,INET_ADDRSTRLEN);
1084                 ip = (struct sockaddr_in *) res->ai_addr;
1085                 inet_ntop(AF_INET, &(ip->sin_addr), ipaddr, INET_ADDRSTRLEN);
1086                 freeaddrinfo(res);
1087         }
1088
1089         const char *argv[] = {
1090                 pb_system_apps.ip,
1091                 "route", "show", "to", "match",
1092                 ipaddr,
1093                 NULL
1094         };
1095
1096         p = process_create(ctx);
1097
1098         p->path = pb_system_apps.ip;
1099         p->argv = argv;
1100         p->keep_stdout = true;
1101
1102         rc = process_run_sync(p);
1103
1104         if (rc || p->exit_status) {
1105                 /* ip has complained for some reason; most likely
1106                  * there is no route to the host - bail out */
1107                 pb_debug("%s: `ip` returns non-zero exit status\n", __func__);
1108                 pb_debug("ip buf: %s\n", p->stdout_buf);
1109                 process_release(p);
1110                 return NULL;
1111         }
1112
1113         buf = p->stdout_buf;
1114         /* If a route is found, ip-route output will be of the form
1115          * "... dev DEVNAME ... " */
1116         tok = strtok(buf, delim);
1117         while (tok) {
1118                 if (!strcmp(tok, "dev")) {
1119                         tok = strtok(NULL, delim);
1120                         dev = talloc_strdup(ctx, tok);
1121                         break;
1122                 }
1123                 tok = strtok(NULL, delim);
1124         }
1125
1126         process_release(p);
1127         if (dev)
1128                 pb_debug("%s: Found interface '%s'\n", __func__,dev);
1129         return dev;
1130 }
1131
1132 void device_handler_process_url(struct device_handler *handler,
1133                 const char *url, const char *mac, const char *ip)
1134 {
1135         struct discover_context *ctx;
1136         struct discover_device *dev;
1137         struct boot_status *status;
1138         struct pb_url *pb_url;
1139         struct event *event;
1140         struct param *param;
1141
1142         status = talloc(handler, struct boot_status);
1143
1144         status->type = BOOT_STATUS_ERROR;
1145         status->progress = 0;
1146         status->detail = talloc_asprintf(status,
1147                         _("Received config URL %s"), url);
1148
1149         if (!handler->network) {
1150                 status->message = talloc_asprintf(handler,
1151                                         _("No network configured"));
1152                 goto msg;
1153         }
1154
1155         event = talloc(handler, struct event);
1156         event->type = EVENT_TYPE_USER;
1157         event->action = EVENT_ACTION_CONF;
1158
1159         if (url[strlen(url) - 1] == '/') {
1160                 event->params = talloc_array(event, struct param, 3);
1161                 param = &event->params[0];
1162                 param->name = talloc_strdup(event, "pxepathprefix");
1163                 param->value = talloc_strdup(event, url);
1164                 param = &event->params[1];
1165                 param->name = talloc_strdup(event, "mac");
1166                 param->value = talloc_strdup(event, mac);
1167                 param = &event->params[2];
1168                 param->name = talloc_strdup(event, "ip");
1169                 param->value = talloc_strdup(event, ip);
1170                 event->n_params = 3;
1171         } else {
1172                 event->params = talloc_array(event, struct param, 1);
1173                 param = &event->params[0];
1174                 param->name = talloc_strdup(event, "pxeconffile");
1175                 param->value = talloc_strdup(event, url);
1176                 event->n_params = 1;
1177         }
1178
1179         pb_url = pb_url_parse(event, event->params->value);
1180         if (!pb_url || (pb_url->scheme != pb_url_file && !pb_url->host)) {
1181                 status->message = talloc_asprintf(handler,
1182                                         _("Invalid config URL!"));
1183                 goto msg;
1184         }
1185
1186         if (pb_url->scheme == pb_url_file)
1187                 event->device = talloc_asprintf(event, "local");
1188         else
1189                 event->device = device_from_addr(event, pb_url);
1190
1191         if (!event->device) {
1192                 status->message = talloc_asprintf(status,
1193                                         _("Unable to route to host %s"),
1194                                         pb_url->host);
1195                 goto msg;
1196         }
1197
1198         dev = discover_device_create(handler, event->device);
1199         if (pb_url->scheme == pb_url_file)
1200                 dev->device->type = DEVICE_TYPE_ANY;
1201         ctx = device_handler_discover_context_create(handler, dev);
1202         ctx->event = event;
1203
1204         iterate_parsers(ctx);
1205
1206         device_handler_discover_context_commit(handler, ctx);
1207
1208         talloc_free(ctx);
1209
1210         status->type = BOOT_STATUS_INFO;
1211         status->message = talloc_asprintf(status, _("Config file %s parsed"),
1212                                         pb_url->file);
1213 msg:
1214         boot_status(handler, status);
1215         talloc_free(status);
1216 }
1217
1218 #ifndef PETITBOOT_TEST
1219
1220 static void device_handler_update_lang(const char *lang)
1221 {
1222         const char *cur_lang;
1223
1224         if (!lang)
1225                 return;
1226
1227         cur_lang = setlocale(LC_ALL, NULL);
1228         if (cur_lang && !strcmp(cur_lang, lang))
1229                 return;
1230
1231         setlocale(LC_ALL, lang);
1232 }
1233
1234 static int device_handler_init_sources(struct device_handler *handler)
1235 {
1236         /* init our device sources: udev, network and user events */
1237         handler->udev = udev_init(handler, handler->waitset);
1238         if (!handler->udev)
1239                 return -1;
1240
1241         handler->network = network_init(handler, handler->waitset,
1242                         handler->dry_run);
1243         if (!handler->network)
1244                 return -1;
1245
1246         handler->user_event = user_event_init(handler, handler->waitset);
1247         if (!handler->user_event)
1248                 return -1;
1249
1250         return 0;
1251 }
1252
1253 static void device_handler_reinit_sources(struct device_handler *handler)
1254 {
1255         /* if we haven't initialised sources previously (becuase we started in
1256          * safe mode), then init once here. */
1257         if (!(handler->udev || handler->network || handler->user_event)) {
1258                 device_handler_init_sources(handler);
1259                 return;
1260         }
1261
1262         udev_reinit(handler->udev);
1263
1264         network_shutdown(handler->network);
1265         handler->network = network_init(handler, handler->waitset,
1266                         handler->dry_run);
1267 }
1268
1269 static inline const char *get_device_path(struct discover_device *dev)
1270 {
1271         return dev->ramdisk ? dev->ramdisk->snapshot : dev->device_path;
1272 }
1273
1274 static char *check_subvols(struct discover_device *dev)
1275 {
1276         const char *fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1277         struct stat sb;
1278         char *path;
1279         int rc;
1280
1281         if (strncmp(fstype, "btrfs", strlen("btrfs")))
1282                 return dev->mount_path;
1283
1284         /* On btrfs a device's root may be under a subvolume path */
1285         path = join_paths(dev, dev->mount_path, "@");
1286         rc = stat(path, &sb);
1287         if (!rc && S_ISDIR(sb.st_mode)) {
1288                 pb_debug("Using '%s' for btrfs root path\n", path);
1289                 return path;
1290         }
1291
1292         talloc_free(path);
1293         return dev->mount_path;
1294 }
1295
1296 static bool check_existing_mount(struct discover_device *dev)
1297 {
1298         struct stat devstat, mntstat;
1299         const char *device_path;
1300         struct mntent *mnt;
1301         FILE *fp;
1302         int rc;
1303
1304         device_path = get_device_path(dev);
1305
1306         rc = stat(device_path, &devstat);
1307         if (rc) {
1308                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
1309                 return false;
1310         }
1311
1312         if (!S_ISBLK(devstat.st_mode)) {
1313                 pb_debug("%s: %s isn't a block device?\n", __func__,
1314                                 dev->device_path);
1315                 return false;
1316         }
1317
1318         fp = fopen("/proc/self/mounts", "r");
1319
1320         for (;;) {
1321                 mnt = getmntent(fp);
1322                 if (!mnt)
1323                         break;
1324
1325                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
1326                         continue;
1327
1328                 rc = stat(mnt->mnt_fsname, &mntstat);
1329                 if (rc)
1330                         continue;
1331
1332                 if (!S_ISBLK(mntstat.st_mode))
1333                         continue;
1334
1335                 if (mntstat.st_rdev == devstat.st_rdev) {
1336                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
1337                         dev->root_path = check_subvols(dev);
1338                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
1339                         dev->mounted = true;
1340                         dev->unmount = false;
1341
1342                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
1343                                         __func__, dev->device_path,
1344                                         dev->mounted_rw ? 'w' : 'o',
1345                                         mnt->mnt_dir);
1346                         break;
1347                 }
1348         }
1349
1350         fclose(fp);
1351
1352         return mnt != NULL;
1353 }
1354
1355 /*
1356  * Attempt to mount a filesystem safely, while handling certain filesytem-
1357  * specific options
1358  */
1359 static int try_mount(const char *device_path, const char *mount_path,
1360                              const char *fstype, unsigned long flags,
1361                              bool have_snapshot)
1362 {
1363         const char *fs, *safe_opts;
1364         int rc;
1365
1366         /* Mount ext3 as ext4 instead so 'norecovery' can be used */
1367         if (strncmp(fstype, "ext3", strlen("ext3")) == 0) {
1368                 pb_debug("Mounting ext3 filesystem as ext4\n");
1369                 fs = "ext4";
1370         } else
1371                 fs = fstype;
1372
1373         if (strncmp(fs, "xfs", strlen("xfs")) == 0 ||
1374             strncmp(fs, "ext4", strlen("ext4")) == 0)
1375                 safe_opts = "norecovery";
1376         else
1377                 safe_opts = NULL;
1378
1379         errno = 0;
1380         /* If no snapshot is available don't attempt recovery */
1381         if (!have_snapshot)
1382                 return mount(device_path, mount_path, fs, flags, safe_opts);
1383
1384         rc = mount(device_path, mount_path, fs, flags, NULL);
1385
1386         if (!rc)
1387                 return rc;
1388
1389         /* Mounting failed; some filesystems will fail to mount if a recovery
1390          * journal exists (eg. cross-endian XFS), so try again with norecovery
1391          * where that option is available.
1392          * If mounting read-write just return the error as norecovery is not a
1393          * valid option */
1394         if ((flags & MS_RDONLY) != MS_RDONLY || !safe_opts)
1395                 return rc;
1396
1397         errno = 0;
1398         return mount(device_path, mount_path, fs, flags, safe_opts);
1399 }
1400
1401 static int mount_device(struct discover_device *dev)
1402 {
1403         const char *fstype, *device_path;
1404         int rc;
1405
1406         if (!dev->device_path)
1407                 return -1;
1408
1409         if (dev->mounted)
1410                 return 0;
1411
1412         if (check_existing_mount(dev))
1413                 return 0;
1414
1415         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1416         if (!fstype)
1417                 return 0;
1418
1419         dev->mount_path = join_paths(dev, mount_base(),
1420                                         dev->device_path);
1421
1422         if (pb_mkdir_recursive(dev->mount_path)) {
1423                 pb_log("couldn't create mount directory %s: %s\n",
1424                                 dev->mount_path, strerror(errno));
1425                 goto err_free;
1426         }
1427
1428         device_path = get_device_path(dev);
1429
1430         pb_log("mounting device %s read-only\n", dev->device_path);
1431         rc = try_mount(device_path, dev->mount_path, fstype,
1432                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1433
1434         if (!rc) {
1435                 dev->mounted = true;
1436                 dev->mounted_rw = false;
1437                 dev->unmount = true;
1438                 dev->root_path = check_subvols(dev);
1439                 return 0;
1440         }
1441
1442         pb_log("couldn't mount device %s: mount failed: %s\n",
1443                         device_path, strerror(errno));
1444
1445         /* If mount fails clean up any snapshot */
1446         devmapper_destroy_snapshot(dev);
1447
1448         pb_rmdir_recursive(mount_base(), dev->mount_path);
1449 err_free:
1450         talloc_free(dev->mount_path);
1451         dev->mount_path = NULL;
1452         return -1;
1453 }
1454
1455 static int umount_device(struct discover_device *dev)
1456 {
1457         const char *device_path;
1458         int rc;
1459
1460         if (!dev->mounted || !dev->unmount)
1461                 return 0;
1462
1463         device_path = get_device_path(dev);
1464
1465         pb_log("unmounting device %s\n", device_path);
1466         rc = umount(dev->mount_path);
1467         if (rc)
1468                 return -1;
1469
1470         dev->mounted = false;
1471         devmapper_destroy_snapshot(dev);
1472
1473         pb_rmdir_recursive(mount_base(), dev->mount_path);
1474
1475         talloc_free(dev->mount_path);
1476         dev->mount_path = NULL;
1477         dev->root_path = NULL;
1478
1479         return 0;
1480 }
1481
1482 int device_request_write(struct discover_device *dev, bool *release)
1483 {
1484         const char *fstype, *device_path;
1485         const struct config *config;
1486         int rc;
1487
1488         *release = false;
1489
1490         config = config_get();
1491         if (!config->allow_writes)
1492                 return -1;
1493
1494         if (!dev->mounted)
1495                 return -1;
1496
1497         if (dev->mounted_rw)
1498                 return 0;
1499
1500         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1501
1502         device_path = get_device_path(dev);
1503
1504         pb_log("remounting device %s read-write\n", device_path);
1505
1506         rc = umount(dev->mount_path);
1507         if (rc) {
1508                 pb_log("Failed to unmount %s: %s\n",
1509                        dev->mount_path, strerror(errno));
1510                 return -1;
1511         }
1512
1513         rc = try_mount(device_path, dev->mount_path, fstype,
1514                        MS_SILENT, dev->ramdisk);
1515         if (rc)
1516                 goto mount_ro;
1517
1518         dev->mounted_rw = true;
1519         *release = true;
1520         return 0;
1521
1522 mount_ro:
1523         pb_log("Unable to remount device %s read-write: %s\n",
1524                device_path, strerror(errno));
1525         rc = try_mount(device_path, dev->mount_path, fstype,
1526                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1527         if (rc)
1528                 pb_log("Unable to recover mount for %s: %s\n",
1529                        device_path, strerror(errno));
1530         return -1;
1531 }
1532
1533 void device_release_write(struct discover_device *dev, bool release)
1534 {
1535         const char *fstype, *device_path;
1536
1537         if (!release)
1538                 return;
1539
1540         device_path = get_device_path(dev);
1541
1542         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1543
1544         pb_log("remounting device %s read-only\n", device_path);
1545
1546         if (umount(dev->mount_path)) {
1547                 pb_log("Failed to unmount %s\n", dev->mount_path);
1548                 return;
1549         }
1550         dev->mounted_rw = dev->mounted = false;
1551
1552         if (dev->ramdisk) {
1553                 devmapper_merge_snapshot(dev);
1554                 /* device_path becomes stale after merge */
1555                 device_path = get_device_path(dev);
1556         }
1557
1558         if (try_mount(device_path, dev->mount_path, fstype,
1559                        MS_RDONLY | MS_SILENT, dev->ramdisk))
1560                 pb_log("Failed to remount %s read-only: %s\n",
1561                        device_path, strerror(errno));
1562         else
1563                 dev->mounted = true;
1564 }
1565
1566 #else
1567
1568 static void device_handler_update_lang(const char *lang __attribute__((unused)))
1569 {
1570 }
1571
1572 static int device_handler_init_sources(
1573                 struct device_handler *handler __attribute__((unused)))
1574 {
1575         return 0;
1576 }
1577
1578 static void device_handler_reinit_sources(
1579                 struct device_handler *handler __attribute__((unused)))
1580 {
1581 }
1582
1583 static int umount_device(struct discover_device *dev __attribute__((unused)))
1584 {
1585         return 0;
1586 }
1587
1588 static int __attribute__((unused)) mount_device(
1589                 struct discover_device *dev __attribute__((unused)))
1590 {
1591         return 0;
1592 }
1593
1594 int device_request_write(struct discover_device *dev __attribute__((unused)),
1595                 bool *release)
1596 {
1597         *release = true;
1598         return 0;
1599 }
1600
1601 void device_release_write(struct discover_device *dev __attribute__((unused)),
1602         bool release __attribute__((unused)))
1603 {
1604 }
1605
1606 #endif
1607