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 *uuid, const char *id)
 225 {
 226         struct discover_device *dev;
 227
 228         if (uuid)
 229                 dev = device_lookup_by_uuid(handler, uuid);
 230         else
 231                 dev = device_lookup_by_id(handler, id);
 232
 233         if (dev)
 234                 return dev;
 235
 236         dev = talloc_zero(handler, struct discover_device);
 237         dev->device = talloc_zero(dev, struct device);
 238         dev->device->id = talloc_strdup(dev->device, id);
 239         dev->uuid = talloc_strdup(dev, uuid);
 240         list_init(&dev->params);
 241         list_init(&dev->boot_options);
 242
 243         talloc_set_destructor(dev, destroy_device);
 244
 245         return dev;
 246 }
 247
 248 struct discover_device_param {
 249         char                    *name;
 250         char                    *value;
 251         struct list_item        list;
 252 };
 253
 254 void discover_device_set_param(struct discover_device *device,
 255                 const char *name, const char *value)
 256 {
 257         struct discover_device_param *param;
 258         bool found = false;
 259
 260         list_for_each_entry(&device->params, param, list) {
 261                 if (!strcmp(param->name, name)) {
 262                         found = true;
 263                         break;
 264                 }
 265         }
 266
 267         if (!found) {
 268                 if (!value)
 269                         return;
 270                 param = talloc(device, struct discover_device_param);
 271                 param->name = talloc_strdup(param, name);
 272                 list_add(&device->params, &param->list);
 273         } else {
 274                 if (!value) {
 275                         list_remove(&param->list);
 276                         talloc_free(param);
 277                         return;
 278                 }
 279                 talloc_free(param->value);
 280         }
 281
 282         param->value = talloc_strdup(param, value);
 283 }
 284
 285 const char *discover_device_get_param(struct discover_device *device,
 286                 const char *name)
 287 {
 288         struct discover_device_param *param;
 289
 290         list_for_each_entry(&device->params, param, list) {
 291                 if (!strcmp(param->name, name))
 292                         return param->value;
 293         }
 294         return NULL;
 295 }
 296
 297 struct device_handler *device_handler_init(struct discover_server *server,
 298                 struct waitset *waitset, int dry_run)
 299 {
 300         struct device_handler *handler;
 301         int rc;
 302
 303         handler = talloc_zero(NULL, struct device_handler);
 304         handler->server = server;
 305         handler->waitset = waitset;
 306         handler->dry_run = dry_run;
 307         handler->autoboot_enabled = config_get()->autoboot_enabled;
 308
 309         list_init(&handler->unresolved_boot_options);
 310
 311         /* set up our mount point base */
 312         pb_mkdir_recursive(mount_base());
 313
 314         parser_init();
 315
 316         if (config_get()->safe_mode)
 317                 return handler;
 318
 319         rc = device_handler_init_sources(handler);
 320         if (rc) {
 321                 talloc_free(handler);
 322                 return NULL;
 323         }
 324
 325         return handler;
 326 }
 327
 328 void device_handler_reinit(struct device_handler *handler)
 329 {
 330         struct discover_boot_option *opt, *tmp;
 331         struct ramdisk_device *ramdisk;
 332         unsigned int i;
 333
 334         device_handler_cancel_default(handler);
 335
 336         /* free unresolved boot options */
 337         list_for_each_entry_safe(&handler->unresolved_boot_options,
 338                         opt, tmp, list)
 339                 talloc_free(opt);
 340         list_init(&handler->unresolved_boot_options);
 341
 342         /* drop all devices */
 343         for (i = 0; i < handler->n_devices; i++) {
 344                 discover_server_notify_device_remove(handler->server,
 345                                 handler->devices[i]->device);
 346                 ramdisk = handler->devices[i]->ramdisk;
 347                 talloc_free(handler->devices[i]);
 348                 talloc_free(ramdisk);
 349         }
 350
 351         talloc_free(handler->devices);
 352         handler->devices = NULL;
 353         handler->n_devices = 0;
 354         talloc_free(handler->ramdisks);
 355         handler->ramdisks = NULL;
 356         handler->n_ramdisks = 0;
 357
 358         device_handler_reinit_sources(handler);
 359 }
 360
 361 void device_handler_remove(struct device_handler *handler,
 362                 struct discover_device *device)
 363 {
 364         struct discover_boot_option *opt, *tmp;
 365         unsigned int i;
 366
 367         list_for_each_entry_safe(&device->boot_options, opt, tmp, list) {
 368                 if (opt == handler->default_boot_option) {
 369                         pb_log("Default option %s cancelled since device removed",
 370                                         opt->option->name);
 371                         device_handler_cancel_default(handler);
 372                         break;
 373                 }
 374         }
 375
 376         for (i = 0; i < handler->n_devices; i++)
 377                 if (handler->devices[i] == device)
 378                         break;
 379
 380         if (i == handler->n_devices) {
 381                 talloc_free(device);
 382                 return;
 383         }
 384
 385         /* Free any unresolved options, as they're currently allocated
 386          * against the handler */
 387         list_for_each_entry_safe(&handler->unresolved_boot_options,
 388                         opt, tmp, list) {
 389                 if (opt->device != device)
 390                         continue;
 391                 list_remove(&opt->list);
 392                 talloc_free(opt);
 393         }
 394
 395         /* if this is a network device, we have to unregister it from the
 396          * network code */
 397         if (device->device->type == DEVICE_TYPE_NETWORK)
 398                 network_unregister_device(handler->network, device);
 399
 400         handler->n_devices--;
 401         memmove(&handler->devices[i], &handler->devices[i + 1],
 402                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 403         handler->devices = talloc_realloc(handler, handler->devices,
 404                 struct discover_device *, handler->n_devices);
 405
 406         if (device->notified)
 407                 discover_server_notify_device_remove(handler->server,
 408                                                         device->device);
 409
 410         talloc_free(device);
 411 }
 412
 413 void device_handler_status(struct device_handler *handler,
 414                 struct status *status)
 415 {
 416         discover_server_notify_boot_status(handler->server, status);
 417 }
 418
 419 static void _device_handler_vstatus(struct device_handler *handler,
 420                 enum status_type type, const char *fmt, va_list ap)
 421 {
 422         struct status status;
 423
 424         status.type = type;
 425         status.message = talloc_vasprintf(handler, fmt, ap);
 426
 427         device_handler_status(handler, &status);
 428
 429         talloc_free(status.message);
 430 }
 431
 432 static void _device_handler_vdevstatus(struct device_handler *handler,
 433                 struct discover_device *device, enum status_type type,
 434                 const char *fmt, va_list ap)
 435 {
 436         char *msg;
 437
 438         msg = talloc_asprintf(handler, "[%s] %s",
 439                         device ? device->device->id : "unknown", fmt);
 440         _device_handler_vstatus(handler, type, msg, ap);
 441         talloc_free(msg);
 442 }
 443
 444 void device_handler_status_dev_info(struct device_handler *handler,
 445                 struct discover_device *dev, const char *fmt, ...)
 446 {
 447         va_list ap;
 448
 449         va_start(ap, fmt);
 450         _device_handler_vdevstatus(handler, dev, STATUS_INFO, fmt, ap);
 451         va_end(ap);
 452 }
 453
 454 void device_handler_status_dev_err(struct device_handler *handler,
 455                 struct discover_device *dev, const char *fmt, ...)
 456 {
 457         va_list ap;
 458
 459         va_start(ap, fmt);
 460         _device_handler_vdevstatus(handler, dev, STATUS_ERROR, fmt, ap);
 461         va_end(ap);
 462 }
 463
 464 void device_handler_status_info(struct device_handler *handler,
 465                 const char *fmt, ...)
 466 {
 467         va_list ap;
 468
 469         va_start(ap, fmt);
 470         _device_handler_vstatus(handler, STATUS_INFO, fmt, ap);
 471         va_end(ap);
 472 }
 473
 474 void device_handler_status_err(struct device_handler *handler,
 475                 const char *fmt, ...)
 476 {
 477         va_list ap;
 478
 479         va_start(ap, fmt);
 480         _device_handler_vstatus(handler, STATUS_ERROR, fmt, ap);
 481         va_end(ap);
 482 }
 483
 484 static void device_handler_boot_status_cb(void *arg, struct status *status)
 485 {
 486         device_handler_status(arg, status);
 487 }
 488
 489 static void countdown_status(struct device_handler *handler,
 490                 struct discover_boot_option *opt, unsigned int sec)
 491 {
 492         struct status status;
 493
 494         status.type = STATUS_INFO;
 495         status.message = talloc_asprintf(handler,
 496                         _("Booting in %d sec: %s"), sec, opt->option->name);
 497
 498         device_handler_status(handler, &status);
 499
 500         talloc_free(status.message);
 501 }
 502
 503 static int default_timeout(void *arg)
 504 {
 505         struct device_handler *handler = arg;
 506         struct discover_boot_option *opt;
 507
 508         if (!handler->default_boot_option)
 509                 return 0;
 510
 511         if (handler->pending_boot)
 512                 return 0;
 513
 514         opt = handler->default_boot_option;
 515
 516         if (handler->sec_to_boot) {
 517                 countdown_status(handler, opt, handler->sec_to_boot);
 518                 handler->sec_to_boot--;
 519                 handler->timeout_waiter = waiter_register_timeout(
 520                                                 handler->waitset, 1000,
 521                                                 default_timeout, handler);
 522                 return 0;
 523         }
 524
 525         handler->timeout_waiter = NULL;
 526
 527         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 528
 529         platform_pre_boot();
 530
 531         handler->pending_boot = boot(handler, handler->default_boot_option,
 532                         NULL, handler->dry_run, device_handler_boot_status_cb,
 533                         handler);
 534         handler->pending_boot_is_default = true;
 535         return 0;
 536 }
 537
 538 struct {
 539         enum ipmi_bootdev       ipmi_type;
 540         enum device_type        device_type;
 541 } device_type_map[] = {
 542         { IPMI_BOOTDEV_NETWORK, DEVICE_TYPE_NETWORK },
 543         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_DISK },
 544         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_USB },
 545         { IPMI_BOOTDEV_CDROM, DEVICE_TYPE_OPTICAL },
 546 };
 547
 548 static bool ipmi_device_type_matches(enum ipmi_bootdev ipmi_type,
 549                 enum device_type device_type)
 550 {
 551         unsigned int i;
 552
 553         for (i = 0; i < ARRAY_SIZE(device_type_map); i++) {
 554                 if (device_type_map[i].device_type == device_type)
 555                         return device_type_map[i].ipmi_type == ipmi_type;
 556         }
 557
 558         return false;
 559 }
 560
 561 static int autoboot_option_priority(const struct config *config,
 562                                 struct discover_boot_option *opt)
 563 {
 564         enum device_type type = opt->device->device->type;
 565         const char *uuid = opt->device->uuid;
 566         struct autoboot_option *auto_opt;
 567         unsigned int i;
 568
 569         for (i = 0; i < config->n_autoboot_opts; i++) {
 570                 auto_opt = &config->autoboot_opts[i];
 571                 if (auto_opt->boot_type == BOOT_DEVICE_UUID)
 572                         if (!strcmp(auto_opt->uuid, uuid))
 573                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 574
 575                 if (auto_opt->boot_type == BOOT_DEVICE_TYPE)
 576                         if (auto_opt->type == type ||
 577                             auto_opt->type == DEVICE_TYPE_ANY)
 578                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 579         }
 580
 581         return -1;
 582 }
 583
 584 /*
 585  * We have different priorities to resolve conflicts between boot options that
 586  * report to be the default for their device. This function assigns a priority
 587  * for these options.
 588  */
 589 static enum default_priority default_option_priority(
 590                 struct discover_boot_option *opt)
 591 {
 592         const struct config *config;
 593
 594         config = config_get();
 595
 596         /* We give highest priority to IPMI-configured boot options. If
 597          * we have an IPMI bootdev configuration set, then we don't allow
 598          * any other defaults */
 599         if (config->ipmi_bootdev) {
 600                 bool ipmi_match = ipmi_device_type_matches(config->ipmi_bootdev,
 601                                 opt->device->device->type);
 602                 if (ipmi_match)
 603                         return DEFAULT_PRIORITY_REMOTE;
 604
 605                 pb_debug("handler: disabled default priority due to "
 606                                 "non-matching IPMI type %x\n",
 607                                 config->ipmi_bootdev);
 608                 return DEFAULT_PRIORITY_DISABLED;
 609         }
 610
 611         /* Next, try to match the option against the user-defined autoboot
 612          * options, either by device UUID or type. */
 613         if (config->n_autoboot_opts) {
 614                 int boot_match = autoboot_option_priority(config, opt);
 615                 if (boot_match > 0)
 616                         return boot_match;
 617         }
 618
 619         /* If the option didn't match any entry in the array, it is disabled */
 620         pb_debug("handler: disabled default priority due to "
 621                         "non-matching UUID or type\n");
 622         return DEFAULT_PRIORITY_DISABLED;
 623 }
 624
 625 static void set_default(struct device_handler *handler,
 626                 struct discover_boot_option *opt)
 627 {
 628         enum default_priority cur_prio, new_prio;
 629
 630         if (!handler->autoboot_enabled)
 631                 return;
 632
 633         pb_debug("handler: new default option: %s\n", opt->option->id);
 634
 635         new_prio = default_option_priority(opt);
 636
 637         /* Anything outside our range prevents a default boot */
 638         if (new_prio >= DEFAULT_PRIORITY_DISABLED)
 639                 return;
 640
 641         pb_debug("handler: calculated priority %d\n", new_prio);
 642
 643         /* Resolve any conflicts: if we have a new default option, it only
 644          * replaces the current if it has a higher priority. */
 645         if (handler->default_boot_option) {
 646
 647                 cur_prio = handler->default_boot_option_priority;
 648
 649                 if (new_prio < cur_prio) {
 650                         pb_log("handler: new prio %d beats "
 651                                         "old prio %d for %s\n",
 652                                         new_prio, cur_prio,
 653                                         handler->default_boot_option
 654                                                 ->option->id);
 655                         handler->default_boot_option = opt;
 656                         handler->default_boot_option_priority = new_prio;
 657                         /* extend the timeout a little, so the user sees some
 658                          * indication of the change */
 659                         handler->sec_to_boot += 2;
 660                 }
 661
 662                 return;
 663         }
 664
 665         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 666         handler->default_boot_option = opt;
 667         handler->default_boot_option_priority = new_prio;
 668
 669         pb_log("handler: boot option %s set as default, timeout %u sec.\n",
 670                opt->option->id, handler->sec_to_boot);
 671
 672         default_timeout(handler);
 673 }
 674
 675 static bool resource_is_resolved(struct resource *res)
 676 {
 677         return !res || res->resolved;
 678 }
 679
 680 /* We only use this in an assert, which will disappear if we're compiling
 681  * with NDEBUG, so we need the 'used' attribute for these builds */
 682 static bool __attribute__((used)) boot_option_is_resolved(
 683                 struct discover_boot_option *opt)
 684 {
 685         return resource_is_resolved(opt->boot_image) &&
 686                 resource_is_resolved(opt->initrd) &&
 687                 resource_is_resolved(opt->dtb) &&
 688                 resource_is_resolved(opt->args_sig_file) &&
 689                 resource_is_resolved(opt->icon);
 690 }
 691
 692 static bool resource_resolve(struct resource *res, const char *name,
 693                 struct discover_boot_option *opt,
 694                 struct device_handler *handler)
 695 {
 696         struct parser *parser = opt->source;
 697
 698         if (resource_is_resolved(res))
 699                 return true;
 700
 701         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
 702                         opt->option->id, name, parser->name);
 703         parser->resolve_resource(handler, res);
 704
 705         return res->resolved;
 706 }
 707
 708 static bool boot_option_resolve(struct discover_boot_option *opt,
 709                 struct device_handler *handler)
 710 {
 711         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 712                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 713                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 714                 resource_resolve(opt->args_sig_file, "args_sig_file", opt,
 715                         handler) &&
 716                 resource_resolve(opt->icon, "icon", opt, handler);
 717 }
 718
 719 static void boot_option_finalise(struct device_handler *handler,
 720                 struct discover_boot_option *opt)
 721 {
 722         assert(boot_option_is_resolved(opt));
 723
 724         /* check that the parsers haven't set any of the final data */
 725         assert(!opt->option->boot_image_file);
 726         assert(!opt->option->initrd_file);
 727         assert(!opt->option->dtb_file);
 728         assert(!opt->option->icon_file);
 729         assert(!opt->option->device_id);
 730         assert(!opt->option->args_sig_file);
 731
 732         if (opt->boot_image)
 733                 opt->option->boot_image_file = opt->boot_image->url->full;
 734         if (opt->initrd)
 735                 opt->option->initrd_file = opt->initrd->url->full;
 736         if (opt->dtb)
 737                 opt->option->dtb_file = opt->dtb->url->full;
 738         if (opt->icon)
 739                 opt->option->icon_file = opt->icon->url->full;
 740         if (opt->args_sig_file)
 741                 opt->option->args_sig_file = opt->args_sig_file->url->full;
 742
 743         opt->option->device_id = opt->device->device->id;
 744
 745         if (opt->option->is_default)
 746                 set_default(handler, opt);
 747 }
 748
 749 static void notify_boot_option(struct device_handler *handler,
 750                 struct discover_boot_option *opt)
 751 {
 752         struct discover_device *dev = opt->device;
 753
 754         if (!dev->notified)
 755                 discover_server_notify_device_add(handler->server,
 756                                                   opt->device->device);
 757         dev->notified = true;
 758         discover_server_notify_boot_option_add(handler->server, opt->option);
 759 }
 760
 761 static void process_boot_option_queue(struct device_handler *handler)
 762 {
 763         struct discover_boot_option *opt, *tmp;
 764
 765         list_for_each_entry_safe(&handler->unresolved_boot_options,
 766                         opt, tmp, list) {
 767
 768                 pb_debug("queue: attempting resolution for %s\n",
 769                                 opt->option->id);
 770
 771                 if (!boot_option_resolve(opt, handler))
 772                         continue;
 773
 774                 pb_debug("\tresolved!\n");
 775
 776                 list_remove(&opt->list);
 777                 list_add_tail(&opt->device->boot_options, &opt->list);
 778                 talloc_steal(opt->device, opt);
 779                 boot_option_finalise(handler, opt);
 780                 notify_boot_option(handler, opt);
 781         }
 782 }
 783
 784 struct discover_context *device_handler_discover_context_create(
 785                 struct device_handler *handler,
 786                 struct discover_device *device)
 787 {
 788         struct discover_context *ctx;
 789
 790         ctx = talloc_zero(handler, struct discover_context);
 791         ctx->device = device;
 792         ctx->network = handler->network;
 793         list_init(&ctx->boot_options);
 794
 795         return ctx;
 796 }
 797
 798 void device_handler_add_device(struct device_handler *handler,
 799                 struct discover_device *device)
 800 {
 801         handler->n_devices++;
 802         handler->devices = talloc_realloc(handler, handler->devices,
 803                                 struct discover_device *, handler->n_devices);
 804         handler->devices[handler->n_devices - 1] = device;
 805
 806         if (device->device->type == DEVICE_TYPE_NETWORK)
 807                 network_register_device(handler->network, device);
 808 }
 809
 810 void device_handler_add_ramdisk(struct device_handler *handler,
 811                 const char *path)
 812 {
 813         struct ramdisk_device *dev;
 814         unsigned int i;
 815
 816         if (!path)
 817                 return;
 818
 819         for (i = 0; i < handler->n_ramdisks; i++)
 820                 if (!strcmp(handler->ramdisks[i]->path, path))
 821                         return;
 822
 823         dev = talloc_zero(handler, struct ramdisk_device);
 824         if (!dev) {
 825                 pb_log("Failed to allocate memory to track %s\n", path);
 826                 return;
 827         }
 828
 829         dev->path = talloc_strdup(handler, path);
 830
 831         handler->ramdisks = talloc_realloc(handler, handler->ramdisks,
 832                                 struct ramdisk_device *,
 833                                 handler->n_ramdisks + 1);
 834         if (!handler->ramdisks) {
 835                 pb_log("Failed to reallocate memory"
 836                        "- ramdisk tracking inconsistent!\n");
 837                 return;
 838         }
 839
 840         handler->ramdisks[i] = dev;
 841         i = handler->n_ramdisks++;
 842 }
 843
 844 struct ramdisk_device *device_handler_get_ramdisk(
 845                 struct device_handler *handler)
 846 {
 847         unsigned int i;
 848         char *name;
 849         dev_t id;
 850
 851         /* Check if free ramdisk exists */
 852         for (i = 0; i < handler->n_ramdisks; i++)
 853                 if (!handler->ramdisks[i]->snapshot &&
 854                     !handler->ramdisks[i]->origin &&
 855                     !handler->ramdisks[i]->base)
 856                         return handler->ramdisks[i];
 857
 858         /* Otherwise create a new one */
 859         name = talloc_asprintf(handler, "/dev/ram%d",
 860                         handler->n_ramdisks);
 861         if (!name) {
 862                 pb_debug("Failed to allocate memory to name /dev/ram%d",
 863                         handler->n_ramdisks);
 864                 return NULL;
 865         }
 866
 867         id = makedev(1, handler->n_ramdisks);
 868         if (mknod(name, S_IFBLK, id)) {
 869                 if (errno == EEXIST) {
 870                         /* We haven't yet received updates for existing
 871                          * ramdisks - add and use this one */
 872                         pb_debug("Using untracked ramdisk %s\n", name);
 873                 } else {
 874                         pb_log("Failed to create new ramdisk %s: %s\n",
 875                                name, strerror(errno));
 876                         return NULL;
 877                 }
 878         }
 879         device_handler_add_ramdisk(handler, name);
 880         talloc_free(name);
 881
 882         return handler->ramdisks[i];
 883 }
 884
 885 void device_handler_release_ramdisk(struct discover_device *device)
 886 {
 887         struct ramdisk_device *ramdisk = device->ramdisk;
 888
 889         talloc_free(ramdisk->snapshot);
 890         talloc_free(ramdisk->origin);
 891         talloc_free(ramdisk->base);
 892
 893         ramdisk->snapshot = ramdisk->origin = ramdisk->base = NULL;
 894         ramdisk->sectors = 0;
 895
 896         device->ramdisk = NULL;
 897 }
 898
 899 /* Start discovery on a hotplugged device. The device will be in our devices
 900  * array, but has only just been initialised by the hotplug source.
 901  */
 902 int device_handler_discover(struct device_handler *handler,
 903                 struct discover_device *dev)
 904 {
 905         struct discover_context *ctx;
 906         int rc;
 907
 908         /*
 909          * TRANSLATORS: this string will be passed the type and identifier
 910          * of the device. For example, the first parameter could be "Disk",
 911          * (which will be translated accordingly) and the second a Linux device
 912          * identifier like 'sda1' (which will not be translated)
 913          */
 914         device_handler_status_info(handler, _("Processing %s device %s"),
 915                                 device_type_display_name(dev->device->type),
 916                                 dev->device->id);
 917
 918         process_boot_option_queue(handler);
 919
 920         /* create our context */
 921         ctx = device_handler_discover_context_create(handler, dev);
 922
 923         rc = mount_device(dev);
 924         if (rc)
 925                 goto out;
 926
 927         /* add this device to our system info */
 928         system_info_register_blockdev(dev->device->id, dev->uuid,
 929                         dev->mount_path);
 930
 931         /* run the parsers. This will populate the ctx's boot_option list. */
 932         iterate_parsers(ctx);
 933
 934         /* add discovered stuff to the handler */
 935         device_handler_discover_context_commit(handler, ctx);
 936
 937 out:
 938         /*
 939          * TRANSLATORS: the format specifier in this string is a Linux
 940          * device identifier, like 'sda1'
 941          */
 942         device_handler_status_info(handler, _("Processing %s complete"),
 943                                 dev->device->id);
 944
 945         talloc_unlink(handler, ctx);
 946
 947         return 0;
 948 }
 949
 950 /* Incoming dhcp event */
 951 int device_handler_dhcp(struct device_handler *handler,
 952                 struct discover_device *dev, struct event *event)
 953 {
 954         struct discover_context *ctx;
 955
 956         /*
 957          * TRANSLATORS: this format specifier will be the name of a network
 958          * device, like 'eth0'.
 959          */
 960         device_handler_status_info(handler, _("Processing dhcp event on %s"),
 961                                 dev->device->id);
 962
 963         /* create our context */
 964         ctx = device_handler_discover_context_create(handler, dev);
 965         talloc_steal(ctx, event);
 966         ctx->event = event;
 967
 968         iterate_parsers(ctx);
 969
 970         device_handler_discover_context_commit(handler, ctx);
 971
 972         /*
 973          * TRANSLATORS: this format specifier will be the name of a network
 974          * device, like 'eth0'.
 975          */
 976         device_handler_status_info(handler, _("Processing %s complete"),
 977                                 dev->device->id);
 978
 979         talloc_unlink(handler, ctx);
 980
 981         return 0;
 982 }
 983
 984 static struct discover_boot_option *find_boot_option_by_id(
 985                 struct device_handler *handler, const char *id)
 986 {
 987         unsigned int i;
 988
 989         for (i = 0; i < handler->n_devices; i++) {
 990                 struct discover_device *dev = handler->devices[i];
 991                 struct discover_boot_option *opt;
 992
 993                 list_for_each_entry(&dev->boot_options, opt, list)
 994                         if (!strcmp(opt->option->id, id))
 995                                 return opt;
 996         }
 997
 998         return NULL;
 999 }
1000
1001 void device_handler_boot(struct device_handler *handler,
1002                 struct boot_command *cmd)
1003 {
1004         struct discover_boot_option *opt = NULL;
1005
1006         if (cmd->option_id && strlen(cmd->option_id))
1007                 opt = find_boot_option_by_id(handler, cmd->option_id);
1008
1009         if (handler->pending_boot)
1010                 boot_cancel(handler->pending_boot);
1011
1012         platform_pre_boot();
1013
1014         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
1015                         device_handler_boot_status_cb, handler);
1016         handler->pending_boot_is_default = false;
1017 }
1018
1019 void device_handler_cancel_default(struct device_handler *handler)
1020 {
1021         if (handler->timeout_waiter)
1022                 waiter_remove(handler->timeout_waiter);
1023
1024         handler->timeout_waiter = NULL;
1025         handler->autoboot_enabled = false;
1026
1027         /* we only send status if we had a default boot option queued */
1028         if (!handler->default_boot_option)
1029                 return;
1030
1031         pb_log("Cancelling default boot option\n");
1032
1033         if (handler->pending_boot && handler->pending_boot_is_default) {
1034                 boot_cancel(handler->pending_boot);
1035                 handler->pending_boot = NULL;
1036                 handler->pending_boot_is_default = false;
1037         }
1038
1039         handler->default_boot_option = NULL;
1040
1041         device_handler_status_info(handler, _("Default boot cancelled"));
1042 }
1043
1044 void device_handler_update_config(struct device_handler *handler,
1045                 struct config *config)
1046 {
1047         int rc;
1048
1049         rc = config_set(config);
1050         if (rc)
1051                 return;
1052
1053         discover_server_notify_config(handler->server, config);
1054         device_handler_update_lang(config->lang);
1055         device_handler_reinit(handler);
1056 }
1057
1058 static char *device_from_addr(void *ctx, struct pb_url *url)
1059 {
1060         char *ipaddr, *buf, *tok, *dev = NULL;
1061         const char *delim = " ";
1062         struct sockaddr_in *ip;
1063         struct sockaddr_in si;
1064         struct addrinfo *res;
1065         struct process *p;
1066         int rc;
1067
1068         /* Note: IPv4 only */
1069         rc = inet_pton(AF_INET, url->host, &(si.sin_addr));
1070         if (rc > 0) {
1071                 ipaddr = url->host;
1072         } else {
1073                 /* need to turn hostname into a valid IP */
1074                 rc = getaddrinfo(url->host, NULL, NULL, &res);
1075                 if (rc) {
1076                         pb_debug("%s: Invalid URL\n",__func__);
1077                         return NULL;
1078                 }
1079                 ipaddr = talloc_array(ctx,char,INET_ADDRSTRLEN);
1080                 ip = (struct sockaddr_in *) res->ai_addr;
1081                 inet_ntop(AF_INET, &(ip->sin_addr), ipaddr, INET_ADDRSTRLEN);
1082                 freeaddrinfo(res);
1083         }
1084
1085         const char *argv[] = {
1086                 pb_system_apps.ip,
1087                 "route", "show", "to", "match",
1088                 ipaddr,
1089                 NULL
1090         };
1091
1092         p = process_create(ctx);
1093
1094         p->path = pb_system_apps.ip;
1095         p->argv = argv;
1096         p->keep_stdout = true;
1097
1098         rc = process_run_sync(p);
1099
1100         if (rc || p->exit_status) {
1101                 /* ip has complained for some reason; most likely
1102                  * there is no route to the host - bail out */
1103                 pb_debug("%s: `ip` returns non-zero exit status\n", __func__);
1104                 pb_debug("ip buf: %s\n", p->stdout_buf);
1105                 process_release(p);
1106                 return NULL;
1107         }
1108
1109         buf = p->stdout_buf;
1110         /* If a route is found, ip-route output will be of the form
1111          * "... dev DEVNAME ... " */
1112         tok = strtok(buf, delim);
1113         while (tok) {
1114                 if (!strcmp(tok, "dev")) {
1115                         tok = strtok(NULL, delim);
1116                         dev = talloc_strdup(ctx, tok);
1117                         break;
1118                 }
1119                 tok = strtok(NULL, delim);
1120         }
1121
1122         process_release(p);
1123         if (dev)
1124                 pb_debug("%s: Found interface '%s'\n", __func__,dev);
1125         return dev;
1126 }
1127
1128 void device_handler_process_url(struct device_handler *handler,
1129                 const char *url, const char *mac, const char *ip)
1130 {
1131         struct discover_context *ctx;
1132         struct discover_device *dev;
1133         struct pb_url *pb_url;
1134         struct event *event;
1135         struct param *param;
1136
1137         if (!handler->network) {
1138                 device_handler_status_err(handler, _("No network configured"));
1139                 return;
1140         }
1141
1142         event = talloc(handler, struct event);
1143         event->type = EVENT_TYPE_USER;
1144         event->action = EVENT_ACTION_URL;
1145
1146         if (url[strlen(url) - 1] == '/') {
1147                 event->params = talloc_array(event, struct param, 3);
1148                 param = &event->params[0];
1149                 param->name = talloc_strdup(event, "pxepathprefix");
1150                 param->value = talloc_strdup(event, url);
1151                 param = &event->params[1];
1152                 param->name = talloc_strdup(event, "mac");
1153                 param->value = talloc_strdup(event, mac);
1154                 param = &event->params[2];
1155                 param->name = talloc_strdup(event, "ip");
1156                 param->value = talloc_strdup(event, ip);
1157                 event->n_params = 3;
1158         } else {
1159                 event->params = talloc_array(event, struct param, 1);
1160                 param = &event->params[0];
1161                 param->name = talloc_strdup(event, "pxeconffile");
1162                 param->value = talloc_strdup(event, url);
1163                 event->n_params = 1;
1164         }
1165
1166         pb_url = pb_url_parse(event, event->params->value);
1167         if (!pb_url || (pb_url->scheme != pb_url_file && !pb_url->host)) {
1168                 device_handler_status_err(handler, _("Invalid config URL!"));
1169                 return;
1170         }
1171
1172         if (pb_url->scheme == pb_url_file)
1173                 event->device = talloc_asprintf(event, "local");
1174         else
1175                 event->device = device_from_addr(event, pb_url);
1176
1177         if (!event->device) {
1178                 device_handler_status_err(handler,
1179                                         _("Unable to route to host %s"),
1180                                         pb_url->host);
1181                 return;
1182         }
1183
1184         dev = discover_device_create(handler, mac, event->device);
1185         if (pb_url->scheme == pb_url_file)
1186                 dev->device->type = DEVICE_TYPE_ANY;
1187         ctx = device_handler_discover_context_create(handler, dev);
1188         talloc_steal(ctx, event);
1189         ctx->event = event;
1190
1191         iterate_parsers(ctx);
1192
1193         device_handler_discover_context_commit(handler, ctx);
1194
1195         talloc_unlink(handler, ctx);
1196 }
1197
1198 #ifndef PETITBOOT_TEST
1199
1200 /**
1201  * context_commit - Commit a temporary discovery context to the handler,
1202  * and notify the clients about any new options / devices
1203  */
1204 void device_handler_discover_context_commit(struct device_handler *handler,
1205                 struct discover_context *ctx)
1206 {
1207         struct discover_device *dev = ctx->device;
1208         struct discover_boot_option *opt, *tmp;
1209
1210         if (!device_lookup_by_uuid(handler, dev->uuid))
1211                 device_handler_add_device(handler, dev);
1212
1213         /* move boot options from the context to the device */
1214         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
1215                 list_remove(&opt->list);
1216
1217                 /* All boot options need at least a kernel image */
1218                 if (!opt->boot_image || !opt->boot_image->url) {
1219                         pb_log("boot option %s is missing boot image, ignoring\n",
1220                                 opt->option->id);
1221                         talloc_free(opt);
1222                         continue;
1223                 }
1224
1225                 if (boot_option_resolve(opt, handler)) {
1226                         pb_log("boot option %s is resolved, "
1227                                         "sending to clients\n",
1228                                         opt->option->id);
1229                         list_add_tail(&dev->boot_options, &opt->list);
1230                         talloc_steal(dev, opt);
1231                         boot_option_finalise(handler, opt);
1232                         notify_boot_option(handler, opt);
1233                 } else {
1234                         if (!opt->source->resolve_resource) {
1235                                 pb_log("parser %s gave us an unresolved "
1236                                         "resource (%s), but no way to "
1237                                         "resolve it\n",
1238                                         opt->source->name, opt->option->id);
1239                                 talloc_free(opt);
1240                         } else {
1241                                 pb_log("boot option %s is unresolved, "
1242                                                 "adding to queue\n",
1243                                                 opt->option->id);
1244                                 list_add(&handler->unresolved_boot_options,
1245                                                 &opt->list);
1246                                 talloc_steal(handler, opt);
1247                         }
1248                 }
1249         }
1250 }
1251
1252 static void device_handler_update_lang(const char *lang)
1253 {
1254         const char *cur_lang;
1255
1256         if (!lang)
1257                 return;
1258
1259         cur_lang = setlocale(LC_ALL, NULL);
1260         if (cur_lang && !strcmp(cur_lang, lang))
1261                 return;
1262
1263         setlocale(LC_ALL, lang);
1264 }
1265
1266 static int device_handler_init_sources(struct device_handler *handler)
1267 {
1268         /* init our device sources: udev, network and user events */
1269         handler->udev = udev_init(handler, handler->waitset);
1270         if (!handler->udev)
1271                 return -1;
1272
1273         handler->network = network_init(handler, handler->waitset,
1274                         handler->dry_run);
1275         if (!handler->network)
1276                 return -1;
1277
1278         handler->user_event = user_event_init(handler, handler->waitset);
1279         if (!handler->user_event)
1280                 return -1;
1281
1282         return 0;
1283 }
1284
1285 static void device_handler_reinit_sources(struct device_handler *handler)
1286 {
1287         /* if we haven't initialised sources previously (becuase we started in
1288          * safe mode), then init once here. */
1289         if (!(handler->udev || handler->network || handler->user_event)) {
1290                 device_handler_init_sources(handler);
1291                 return;
1292         }
1293
1294         udev_reinit(handler->udev);
1295
1296         network_shutdown(handler->network);
1297         handler->network = network_init(handler, handler->waitset,
1298                         handler->dry_run);
1299 }
1300
1301 static inline const char *get_device_path(struct discover_device *dev)
1302 {
1303         return dev->ramdisk ? dev->ramdisk->snapshot : dev->device_path;
1304 }
1305
1306 static char *check_subvols(struct discover_device *dev)
1307 {
1308         const char *fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1309         struct stat sb;
1310         char *path;
1311         int rc;
1312
1313         if (strncmp(fstype, "btrfs", strlen("btrfs")))
1314                 return dev->mount_path;
1315
1316         /* On btrfs a device's root may be under a subvolume path */
1317         path = join_paths(dev, dev->mount_path, "@");
1318         rc = stat(path, &sb);
1319         if (!rc && S_ISDIR(sb.st_mode)) {
1320                 pb_debug("Using '%s' for btrfs root path\n", path);
1321                 return path;
1322         }
1323
1324         talloc_free(path);
1325         return dev->mount_path;
1326 }
1327
1328 static bool check_existing_mount(struct discover_device *dev)
1329 {
1330         struct stat devstat, mntstat;
1331         const char *device_path;
1332         struct mntent *mnt;
1333         FILE *fp;
1334         int rc;
1335
1336         device_path = get_device_path(dev);
1337
1338         rc = stat(device_path, &devstat);
1339         if (rc) {
1340                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
1341                 return false;
1342         }
1343
1344         if (!S_ISBLK(devstat.st_mode)) {
1345                 pb_debug("%s: %s isn't a block device?\n", __func__,
1346                                 dev->device_path);
1347                 return false;
1348         }
1349
1350         fp = fopen("/proc/self/mounts", "r");
1351
1352         for (;;) {
1353                 mnt = getmntent(fp);
1354                 if (!mnt)
1355                         break;
1356
1357                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
1358                         continue;
1359
1360                 rc = stat(mnt->mnt_fsname, &mntstat);
1361                 if (rc)
1362                         continue;
1363
1364                 if (!S_ISBLK(mntstat.st_mode))
1365                         continue;
1366
1367                 if (mntstat.st_rdev == devstat.st_rdev) {
1368                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
1369                         dev->root_path = check_subvols(dev);
1370                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
1371                         dev->mounted = true;
1372                         dev->unmount = false;
1373
1374                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
1375                                         __func__, dev->device_path,
1376                                         dev->mounted_rw ? 'w' : 'o',
1377                                         mnt->mnt_dir);
1378                         break;
1379                 }
1380         }
1381
1382         fclose(fp);
1383
1384         return mnt != NULL;
1385 }
1386
1387 /*
1388  * Attempt to mount a filesystem safely, while handling certain filesytem-
1389  * specific options
1390  */
1391 static int try_mount(const char *device_path, const char *mount_path,
1392                              const char *fstype, unsigned long flags,
1393                              bool have_snapshot)
1394 {
1395         const char *fs, *safe_opts;
1396         int rc;
1397
1398         /* Mount ext3 as ext4 instead so 'norecovery' can be used */
1399         if (strncmp(fstype, "ext3", strlen("ext3")) == 0) {
1400                 pb_debug("Mounting ext3 filesystem as ext4\n");
1401                 fs = "ext4";
1402         } else
1403                 fs = fstype;
1404
1405         if (strncmp(fs, "xfs", strlen("xfs")) == 0 ||
1406             strncmp(fs, "ext4", strlen("ext4")) == 0)
1407                 safe_opts = "norecovery";
1408         else
1409                 safe_opts = NULL;
1410
1411         errno = 0;
1412         /* If no snapshot is available don't attempt recovery */
1413         if (!have_snapshot)
1414                 return mount(device_path, mount_path, fs, flags, safe_opts);
1415
1416         rc = mount(device_path, mount_path, fs, flags, NULL);
1417
1418         if (!rc)
1419                 return rc;
1420
1421         /* Mounting failed; some filesystems will fail to mount if a recovery
1422          * journal exists (eg. cross-endian XFS), so try again with norecovery
1423          * where that option is available.
1424          * If mounting read-write just return the error as norecovery is not a
1425          * valid option */
1426         if ((flags & MS_RDONLY) != MS_RDONLY || !safe_opts)
1427                 return rc;
1428
1429         errno = 0;
1430         return mount(device_path, mount_path, fs, flags, safe_opts);
1431 }
1432
1433 static int mount_device(struct discover_device *dev)
1434 {
1435         const char *fstype, *device_path;
1436         int rc;
1437
1438         if (!dev->device_path)
1439                 return -1;
1440
1441         if (dev->mounted)
1442                 return 0;
1443
1444         if (check_existing_mount(dev))
1445                 return 0;
1446
1447         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1448         if (!fstype)
1449                 return 0;
1450
1451         dev->mount_path = join_paths(dev, mount_base(),
1452                                         dev->device_path);
1453
1454         if (pb_mkdir_recursive(dev->mount_path)) {
1455                 pb_log("couldn't create mount directory %s: %s\n",
1456                                 dev->mount_path, strerror(errno));
1457                 goto err_free;
1458         }
1459
1460         device_path = get_device_path(dev);
1461
1462         pb_log("mounting device %s read-only\n", dev->device_path);
1463         rc = try_mount(device_path, dev->mount_path, fstype,
1464                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1465
1466         if (!rc) {
1467                 dev->mounted = true;
1468                 dev->mounted_rw = false;
1469                 dev->unmount = true;
1470                 dev->root_path = check_subvols(dev);
1471                 return 0;
1472         }
1473
1474         pb_log("couldn't mount device %s: mount failed: %s\n",
1475                         device_path, strerror(errno));
1476
1477         /* If mount fails clean up any snapshot */
1478         devmapper_destroy_snapshot(dev);
1479
1480         pb_rmdir_recursive(mount_base(), dev->mount_path);
1481 err_free:
1482         talloc_free(dev->mount_path);
1483         dev->mount_path = NULL;
1484         return -1;
1485 }
1486
1487 static int umount_device(struct discover_device *dev)
1488 {
1489         const char *device_path;
1490         int rc;
1491
1492         if (!dev->mounted || !dev->unmount)
1493                 return 0;
1494
1495         device_path = get_device_path(dev);
1496
1497         pb_log("unmounting device %s\n", device_path);
1498         rc = umount(dev->mount_path);
1499         if (rc)
1500                 return -1;
1501
1502         dev->mounted = false;
1503         devmapper_destroy_snapshot(dev);
1504
1505         pb_rmdir_recursive(mount_base(), dev->mount_path);
1506
1507         talloc_free(dev->mount_path);
1508         dev->mount_path = NULL;
1509         dev->root_path = NULL;
1510
1511         return 0;
1512 }
1513
1514 int device_request_write(struct discover_device *dev, bool *release)
1515 {
1516         const char *fstype, *device_path;
1517         const struct config *config;
1518         int rc;
1519
1520         *release = false;
1521
1522         config = config_get();
1523         if (!config->allow_writes)
1524                 return -1;
1525
1526         if (!dev->mounted)
1527                 return -1;
1528
1529         if (dev->mounted_rw)
1530                 return 0;
1531
1532         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1533
1534         device_path = get_device_path(dev);
1535
1536         pb_log("remounting device %s read-write\n", device_path);
1537
1538         rc = umount(dev->mount_path);
1539         if (rc) {
1540                 pb_log("Failed to unmount %s: %s\n",
1541                        dev->mount_path, strerror(errno));
1542                 return -1;
1543         }
1544
1545         rc = try_mount(device_path, dev->mount_path, fstype,
1546                        MS_SILENT, dev->ramdisk);
1547         if (rc)
1548                 goto mount_ro;
1549
1550         dev->mounted_rw = true;
1551         *release = true;
1552         return 0;
1553
1554 mount_ro:
1555         pb_log("Unable to remount device %s read-write: %s\n",
1556                device_path, strerror(errno));
1557         rc = try_mount(device_path, dev->mount_path, fstype,
1558                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1559         if (rc)
1560                 pb_log("Unable to recover mount for %s: %s\n",
1561                        device_path, strerror(errno));
1562         return -1;
1563 }
1564
1565 void device_release_write(struct discover_device *dev, bool release)
1566 {
1567         const char *fstype, *device_path;
1568
1569         if (!release)
1570                 return;
1571
1572         device_path = get_device_path(dev);
1573
1574         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1575
1576         pb_log("remounting device %s read-only\n", device_path);
1577
1578         if (umount(dev->mount_path)) {
1579                 pb_log("Failed to unmount %s\n", dev->mount_path);
1580                 return;
1581         }
1582         dev->mounted_rw = dev->mounted = false;
1583
1584         if (dev->ramdisk) {
1585                 devmapper_merge_snapshot(dev);
1586                 /* device_path becomes stale after merge */
1587                 device_path = get_device_path(dev);
1588         }
1589
1590         if (try_mount(device_path, dev->mount_path, fstype,
1591                        MS_RDONLY | MS_SILENT, dev->ramdisk))
1592                 pb_log("Failed to remount %s read-only: %s\n",
1593                        device_path, strerror(errno));
1594         else
1595                 dev->mounted = true;
1596 }
1597
1598 void device_sync_snapshots(struct device_handler *handler, const char *device)
1599 {
1600         struct discover_device *dev = NULL;
1601         unsigned int i;
1602
1603         if (device) {
1604                 /* Find matching device and sync */
1605                 dev = device_lookup_by_name(handler, device);
1606                 if (!dev) {
1607                         pb_log("%s: device name '%s' unrecognised\n",
1608                                 __func__, device);
1609                         return;
1610                 }
1611                 if (dev->ramdisk)
1612                         device_release_write(dev, true);
1613                 else
1614                         pb_log("%s has no snapshot to merge, skipping\n",
1615                                 dev->device->id);
1616                 return;
1617         }
1618
1619         /* Otherwise sync all relevant devices */
1620         for (i = 0; i < handler->n_devices; i++) {
1621                 dev = handler->devices[i];
1622                 if (dev->device->type != DEVICE_TYPE_DISK &&
1623                         dev->device->type != DEVICE_TYPE_USB)
1624                         continue;
1625                 if (dev->ramdisk)
1626                         device_release_write(dev, true);
1627                 else
1628                         pb_log("%s has no snapshot to merge, skipping\n",
1629                                 dev->device->id);
1630         }
1631 }
1632
1633 #else
1634
1635 void device_handler_discover_context_commit(
1636                 struct device_handler *handler __attribute__((unused)),
1637                 struct discover_context *ctx __attribute__((unused)))
1638 {
1639         pb_log("%s stubbed out for test cases\n", __func__);
1640 }
1641
1642 static void device_handler_update_lang(const char *lang __attribute__((unused)))
1643 {
1644 }
1645
1646 static int device_handler_init_sources(
1647                 struct device_handler *handler __attribute__((unused)))
1648 {
1649         return 0;
1650 }
1651
1652 static void device_handler_reinit_sources(
1653                 struct device_handler *handler __attribute__((unused)))
1654 {
1655 }
1656
1657 static int umount_device(struct discover_device *dev __attribute__((unused)))
1658 {
1659         return 0;
1660 }
1661
1662 static int __attribute__((unused)) mount_device(
1663                 struct discover_device *dev __attribute__((unused)))
1664 {
1665         return 0;
1666 }
1667
1668 int device_request_write(struct discover_device *dev __attribute__((unused)),
1669                 bool *release)
1670 {
1671         *release = true;
1672         return 0;
1673 }
1674
1675 void device_release_write(struct discover_device *dev __attribute__((unused)),
1676         bool release __attribute__((unused)))
1677 {
1678 }
1679
1680 void device_sync_snapshots(
1681                 struct device_handler *handler __attribute__((unused)),
1682                 const char *device __attribute__((unused)))
1683 {
1684 }
1685
1686 #endif