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