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 progress_info {
  50         unsigned int                    percentage;
  51         unsigned long                   size;           /* size in bytes */
  52
  53         const struct process_info       *procinfo;
  54         struct list_item        list;
  55 };
  56
  57 struct device_handler {
  58         struct discover_server  *server;
  59         int                     dry_run;
  60
  61         struct pb_udev          *udev;
  62         struct network          *network;
  63         struct user_event       *user_event;
  64
  65         struct discover_device  **devices;
  66         unsigned int            n_devices;
  67
  68         struct ramdisk_device   **ramdisks;
  69         unsigned int            n_ramdisks;
  70
  71         struct waitset          *waitset;
  72         struct waiter           *timeout_waiter;
  73         bool                    autoboot_enabled;
  74         unsigned int            sec_to_boot;
  75
  76         struct discover_boot_option *default_boot_option;
  77         int                     default_boot_option_priority;
  78
  79         struct list             unresolved_boot_options;
  80
  81         struct boot_task        *pending_boot;
  82         bool                    pending_boot_is_default;
  83
  84         struct list             progress;
  85         unsigned int            n_progress;
  86 };
  87
  88 static int mount_device(struct discover_device *dev);
  89 static int umount_device(struct discover_device *dev);
  90
  91 static int device_handler_init_sources(struct device_handler *handler);
  92 static void device_handler_reinit_sources(struct device_handler *handler);
  93
  94 static void device_handler_update_lang(const char *lang);
  95
  96 void discover_context_add_boot_option(struct discover_context *ctx,
  97                 struct discover_boot_option *boot_option)
  98 {
  99         boot_option->source = ctx->parser;
 100         list_add_tail(&ctx->boot_options, &boot_option->list);
 101         talloc_steal(ctx, boot_option);
 102 }
 103
 104 /**
 105  * device_handler_get_device_count - Get the count of current handler devices.
 106  */
 107
 108 int device_handler_get_device_count(const struct device_handler *handler)
 109 {
 110         return handler->n_devices;
 111 }
 112
 113 /**
 114  * device_handler_get_device - Get a handler device by index.
 115  */
 116
 117 const struct discover_device *device_handler_get_device(
 118         const struct device_handler *handler, unsigned int index)
 119 {
 120         if (index >= handler->n_devices) {
 121                 assert(0 && "bad index");
 122                 return NULL;
 123         }
 124
 125         return handler->devices[index];
 126 }
 127
 128 struct network *device_handler_get_network(
 129                 const struct device_handler *handler)
 130 {
 131         return handler->network;
 132 }
 133
 134 struct discover_boot_option *discover_boot_option_create(
 135                 struct discover_context *ctx,
 136                 struct discover_device *device)
 137 {
 138         struct discover_boot_option *opt;
 139
 140         opt = talloc_zero(ctx, struct discover_boot_option);
 141         opt->option = talloc_zero(opt, struct boot_option);
 142         opt->device = device;
 143
 144         return opt;
 145 }
 146
 147 static int device_match_uuid(struct discover_device *dev, const char *uuid)
 148 {
 149         return dev->uuid && !strcmp(dev->uuid, uuid);
 150 }
 151
 152 static int device_match_label(struct discover_device *dev, const char *label)
 153 {
 154         return dev->label && !strcmp(dev->label, label);
 155 }
 156
 157 static int device_match_id(struct discover_device *dev, const char *id)
 158 {
 159         return !strcmp(dev->device->id, id);
 160 }
 161
 162 static int device_match_serial(struct discover_device *dev, const char *serial)
 163 {
 164         const char *val = discover_device_get_param(dev, "ID_SERIAL");
 165         return val && !strcmp(val, serial);
 166 }
 167
 168 static struct discover_device *device_lookup(
 169                 struct device_handler *device_handler,
 170                 int (match_fn)(struct discover_device *, const char *),
 171                 const char *str)
 172 {
 173         struct discover_device *dev;
 174         unsigned int i;
 175
 176         if (!str)
 177                 return NULL;
 178
 179         for (i = 0; i < device_handler->n_devices; i++) {
 180                 dev = device_handler->devices[i];
 181
 182                 if (match_fn(dev, str))
 183                         return dev;
 184         }
 185
 186         return NULL;
 187 }
 188
 189 struct discover_device *device_lookup_by_name(struct device_handler *handler,
 190                 const char *name)
 191 {
 192         if (!strncmp(name, "/dev/", strlen("/dev/")))
 193                 name += strlen("/dev/");
 194
 195         return device_lookup_by_id(handler, name);
 196 }
 197
 198 struct discover_device *device_lookup_by_uuid(
 199                 struct device_handler *device_handler,
 200                 const char *uuid)
 201 {
 202         return device_lookup(device_handler, device_match_uuid, uuid);
 203 }
 204
 205 struct discover_device *device_lookup_by_label(
 206                 struct device_handler *device_handler,
 207                 const char *label)
 208 {
 209         return device_lookup(device_handler, device_match_label, label);
 210 }
 211
 212 struct discover_device *device_lookup_by_id(
 213                 struct device_handler *device_handler,
 214                 const char *id)
 215 {
 216         return device_lookup(device_handler, device_match_id, id);
 217 }
 218
 219 struct discover_device *device_lookup_by_serial(
 220                 struct device_handler *device_handler,
 221                 const char *serial)
 222 {
 223         return device_lookup(device_handler, device_match_serial, serial);
 224 }
 225
 226 void device_handler_destroy(struct device_handler *handler)
 227 {
 228         talloc_free(handler);
 229 }
 230
 231 static int destroy_device(void *arg)
 232 {
 233         struct discover_device *dev = arg;
 234
 235         umount_device(dev);
 236
 237         return 0;
 238 }
 239
 240 struct discover_device *discover_device_create(struct device_handler *handler,
 241                 const char *uuid, const char *id)
 242 {
 243         struct discover_device *dev;
 244
 245         if (uuid)
 246                 dev = device_lookup_by_uuid(handler, uuid);
 247         else
 248                 dev = device_lookup_by_id(handler, id);
 249
 250         if (dev)
 251                 return dev;
 252
 253         dev = talloc_zero(handler, struct discover_device);
 254         dev->device = talloc_zero(dev, struct device);
 255         dev->device->id = talloc_strdup(dev->device, id);
 256         dev->uuid = talloc_strdup(dev, uuid);
 257         list_init(&dev->params);
 258         list_init(&dev->boot_options);
 259
 260         talloc_set_destructor(dev, destroy_device);
 261
 262         return dev;
 263 }
 264
 265 struct discover_device_param {
 266         char                    *name;
 267         char                    *value;
 268         struct list_item        list;
 269 };
 270
 271 void discover_device_set_param(struct discover_device *device,
 272                 const char *name, const char *value)
 273 {
 274         struct discover_device_param *param;
 275         bool found = false;
 276
 277         list_for_each_entry(&device->params, param, list) {
 278                 if (!strcmp(param->name, name)) {
 279                         found = true;
 280                         break;
 281                 }
 282         }
 283
 284         if (!found) {
 285                 if (!value)
 286                         return;
 287                 param = talloc(device, struct discover_device_param);
 288                 param->name = talloc_strdup(param, name);
 289                 list_add(&device->params, &param->list);
 290         } else {
 291                 if (!value) {
 292                         list_remove(&param->list);
 293                         talloc_free(param);
 294                         return;
 295                 }
 296                 talloc_free(param->value);
 297         }
 298
 299         param->value = talloc_strdup(param, value);
 300 }
 301
 302 const char *discover_device_get_param(struct discover_device *device,
 303                 const char *name)
 304 {
 305         struct discover_device_param *param;
 306
 307         list_for_each_entry(&device->params, param, list) {
 308                 if (!strcmp(param->name, name))
 309                         return param->value;
 310         }
 311         return NULL;
 312 }
 313
 314 struct device_handler *device_handler_init(struct discover_server *server,
 315                 struct waitset *waitset, int dry_run)
 316 {
 317         struct device_handler *handler;
 318         int rc;
 319
 320         handler = talloc_zero(NULL, struct device_handler);
 321         handler->server = server;
 322         handler->waitset = waitset;
 323         handler->dry_run = dry_run;
 324         handler->autoboot_enabled = config_get()->autoboot_enabled;
 325
 326         list_init(&handler->unresolved_boot_options);
 327
 328         list_init(&handler->progress);
 329
 330         /* set up our mount point base */
 331         pb_mkdir_recursive(mount_base());
 332
 333         parser_init();
 334
 335         if (config_get()->safe_mode)
 336                 return handler;
 337
 338         rc = device_handler_init_sources(handler);
 339         if (rc) {
 340                 talloc_free(handler);
 341                 return NULL;
 342         }
 343
 344         return handler;
 345 }
 346
 347 void device_handler_reinit(struct device_handler *handler)
 348 {
 349         struct discover_boot_option *opt, *tmp;
 350         struct ramdisk_device *ramdisk;
 351         unsigned int i;
 352
 353         device_handler_cancel_default(handler);
 354
 355         /* free unresolved boot options */
 356         list_for_each_entry_safe(&handler->unresolved_boot_options,
 357                         opt, tmp, list)
 358                 talloc_free(opt);
 359         list_init(&handler->unresolved_boot_options);
 360
 361         /* drop all devices */
 362         for (i = 0; i < handler->n_devices; i++) {
 363                 discover_server_notify_device_remove(handler->server,
 364                                 handler->devices[i]->device);
 365                 ramdisk = handler->devices[i]->ramdisk;
 366                 talloc_free(handler->devices[i]);
 367                 talloc_free(ramdisk);
 368         }
 369
 370         talloc_free(handler->devices);
 371         handler->devices = NULL;
 372         handler->n_devices = 0;
 373         talloc_free(handler->ramdisks);
 374         handler->ramdisks = NULL;
 375         handler->n_ramdisks = 0;
 376
 377         device_handler_reinit_sources(handler);
 378 }
 379
 380 void device_handler_remove(struct device_handler *handler,
 381                 struct discover_device *device)
 382 {
 383         struct discover_boot_option *opt, *tmp;
 384         unsigned int i;
 385
 386         list_for_each_entry_safe(&device->boot_options, opt, tmp, list) {
 387                 if (opt == handler->default_boot_option) {
 388                         pb_log("Default option %s cancelled since device removed",
 389                                         opt->option->name);
 390                         device_handler_cancel_default(handler);
 391                         break;
 392                 }
 393         }
 394
 395         for (i = 0; i < handler->n_devices; i++)
 396                 if (handler->devices[i] == device)
 397                         break;
 398
 399         if (i == handler->n_devices) {
 400                 talloc_free(device);
 401                 return;
 402         }
 403
 404         /* Free any unresolved options, as they're currently allocated
 405          * against the handler */
 406         list_for_each_entry_safe(&handler->unresolved_boot_options,
 407                         opt, tmp, list) {
 408                 if (opt->device != device)
 409                         continue;
 410                 list_remove(&opt->list);
 411                 talloc_free(opt);
 412         }
 413
 414         /* if this is a network device, we have to unregister it from the
 415          * network code */
 416         if (device->device->type == DEVICE_TYPE_NETWORK)
 417                 network_unregister_device(handler->network, device);
 418
 419         handler->n_devices--;
 420         memmove(&handler->devices[i], &handler->devices[i + 1],
 421                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 422         handler->devices = talloc_realloc(handler, handler->devices,
 423                 struct discover_device *, handler->n_devices);
 424
 425         if (device->notified)
 426                 discover_server_notify_device_remove(handler->server,
 427                                                         device->device);
 428
 429         talloc_free(device);
 430 }
 431
 432 void device_handler_status(struct device_handler *handler,
 433                 struct status *status)
 434 {
 435         discover_server_notify_boot_status(handler->server, status);
 436 }
 437
 438 static void _device_handler_vstatus(struct device_handler *handler,
 439                 enum status_type type, const char *fmt, va_list ap)
 440 {
 441         struct status status;
 442
 443         status.type = type;
 444         status.message = talloc_vasprintf(handler, fmt, ap);
 445
 446         device_handler_status(handler, &status);
 447
 448         talloc_free(status.message);
 449 }
 450
 451 static void _device_handler_vdevstatus(struct device_handler *handler,
 452                 struct discover_device *device, enum status_type type,
 453                 const char *fmt, va_list ap)
 454 {
 455         char *msg;
 456
 457         msg = talloc_asprintf(handler, "[%s] %s",
 458                         device ? device->device->id : "unknown", fmt);
 459         _device_handler_vstatus(handler, type, msg, ap);
 460         talloc_free(msg);
 461 }
 462
 463 void device_handler_status_dev_info(struct device_handler *handler,
 464                 struct discover_device *dev, const char *fmt, ...)
 465 {
 466         va_list ap;
 467
 468         va_start(ap, fmt);
 469         _device_handler_vdevstatus(handler, dev, STATUS_INFO, fmt, ap);
 470         va_end(ap);
 471 }
 472
 473 void device_handler_status_dev_err(struct device_handler *handler,
 474                 struct discover_device *dev, const char *fmt, ...)
 475 {
 476         va_list ap;
 477
 478         va_start(ap, fmt);
 479         _device_handler_vdevstatus(handler, dev, STATUS_ERROR, fmt, ap);
 480         va_end(ap);
 481 }
 482
 483 void device_handler_status_info(struct device_handler *handler,
 484                 const char *fmt, ...)
 485 {
 486         va_list ap;
 487
 488         va_start(ap, fmt);
 489         _device_handler_vstatus(handler, STATUS_INFO, fmt, ap);
 490         va_end(ap);
 491 }
 492
 493 void device_handler_status_err(struct device_handler *handler,
 494                 const char *fmt, ...)
 495 {
 496         va_list ap;
 497
 498         va_start(ap, fmt);
 499         _device_handler_vstatus(handler, STATUS_ERROR, fmt, ap);
 500         va_end(ap);
 501 }
 502
 503 void device_handler_status_download(struct device_handler *handler,
 504                 const struct process_info *procinfo,
 505                 unsigned int percentage, unsigned int size, char suffix)
 506 {
 507         struct progress_info *p, *progress = NULL;
 508         uint64_t current_converted, current = 0;
 509         const char *units = " kMGTP";
 510         unsigned long size_bytes;
 511         char *update = NULL;
 512         double total = 0;
 513         unsigned int i;
 514         int unit = 0;
 515
 516         list_for_each_entry(&handler->progress, p, list)
 517                 if (p->procinfo == procinfo)
 518                         progress = p;
 519
 520         if (!progress) {
 521                 pb_log("Registering new progress struct\n");
 522                 progress = talloc_zero(handler, struct progress_info);
 523                 if (!progress) {
 524                         pb_log("Failed to allocate room for progress struct\n");
 525                         return;
 526                 }
 527                 progress->procinfo = procinfo;
 528                 list_add(&handler->progress, &progress->list);
 529                 handler->n_progress++;
 530         }
 531
 532         size_bytes = size;
 533         for (i = 0; i < strlen(units); i++) {
 534                 if (units[i] == suffix)
 535                         break;
 536         }
 537
 538         if (i >= strlen(units)) {
 539             pb_log("Couldn't recognise suffix '%c'\n", suffix);
 540             size_bytes = 0;
 541         } else {
 542                 while (i--)
 543                         size_bytes <<= 10;
 544         }
 545
 546         progress->percentage = percentage;
 547         progress->size = size_bytes;
 548
 549         /*
 550          * Aggregate the info we have and update status. If a progress struct
 551          * has zero for both percentage and size we assume progress information
 552          * is unavailable and fall back to a generic progress message.
 553          */
 554         list_for_each_entry(&handler->progress, p, list) {
 555                 uint64_t c;
 556                 double t;
 557                 if (!p->percentage || !p->size) {
 558                         update = talloc_asprintf(handler,
 559                                         _("%u downloads in progress..."),
 560                                         handler->n_progress);
 561                         current = total = 0;
 562                         break;
 563                 }
 564
 565                 c = p->size;
 566                 t = (100 * c) / p->percentage;
 567
 568                 current += c;
 569                 total += t;
 570         }
 571
 572         if (total) {
 573                 current_converted = current;
 574                 while (current_converted >= 1000) {
 575                         current_converted >>= 10;
 576                         unit++;
 577                 }
 578                 update = talloc_asprintf(handler,
 579                                 _("%u %s downloading: %.0f%% - %lu%cB"),
 580                                 handler->n_progress,
 581                                 ngettext("item", "items", handler->n_progress),
 582                                 (current / total) * 100, current_converted,
 583                                 units[unit]);
 584         }
 585
 586         if (!update) {
 587                 pb_log("%s: failed to allocate new status\n", __func__);
 588         } else {
 589                 device_handler_status_info(handler, "%s\n", update);
 590                 talloc_free(update);
 591         }
 592 }
 593
 594 void device_handler_status_download_remove(struct device_handler *handler,
 595                 struct process_info *procinfo)
 596 {
 597         struct progress_info *p, *tmp;
 598
 599         list_for_each_entry_safe(&handler->progress, p, tmp, list)
 600                 if (p->procinfo == procinfo) {
 601                         list_remove(&p->list);
 602                         talloc_free(p);
 603                         handler->n_progress--;
 604                 }
 605 }
 606
 607 static void device_handler_boot_status_cb(void *arg, struct status *status)
 608 {
 609         device_handler_status(arg, status);
 610 }
 611
 612 static void countdown_status(struct device_handler *handler,
 613                 struct discover_boot_option *opt, unsigned int sec)
 614 {
 615         struct status status;
 616
 617         status.type = STATUS_INFO;
 618         status.message = talloc_asprintf(handler,
 619                         _("Booting in %d sec: %s"), sec, opt->option->name);
 620
 621         device_handler_status(handler, &status);
 622
 623         talloc_free(status.message);
 624 }
 625
 626 static int default_timeout(void *arg)
 627 {
 628         struct device_handler *handler = arg;
 629         struct discover_boot_option *opt;
 630
 631         if (!handler->default_boot_option)
 632                 return 0;
 633
 634         if (handler->pending_boot)
 635                 return 0;
 636
 637         opt = handler->default_boot_option;
 638
 639         if (handler->sec_to_boot) {
 640                 countdown_status(handler, opt, handler->sec_to_boot);
 641                 handler->sec_to_boot--;
 642                 handler->timeout_waiter = waiter_register_timeout(
 643                                                 handler->waitset, 1000,
 644                                                 default_timeout, handler);
 645                 return 0;
 646         }
 647
 648         handler->timeout_waiter = NULL;
 649
 650         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 651
 652         platform_pre_boot();
 653
 654         handler->pending_boot = boot(handler, handler->default_boot_option,
 655                         NULL, handler->dry_run, device_handler_boot_status_cb,
 656                         handler);
 657         handler->pending_boot_is_default = true;
 658         return 0;
 659 }
 660
 661 struct {
 662         enum ipmi_bootdev       ipmi_type;
 663         enum device_type        device_type;
 664 } device_type_map[] = {
 665         { IPMI_BOOTDEV_NETWORK, DEVICE_TYPE_NETWORK },
 666         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_DISK },
 667         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_USB },
 668         { IPMI_BOOTDEV_CDROM, DEVICE_TYPE_OPTICAL },
 669 };
 670
 671 static bool ipmi_device_type_matches(enum ipmi_bootdev ipmi_type,
 672                 enum device_type device_type)
 673 {
 674         unsigned int i;
 675
 676         for (i = 0; i < ARRAY_SIZE(device_type_map); i++) {
 677                 if (device_type_map[i].device_type == device_type)
 678                         return device_type_map[i].ipmi_type == ipmi_type;
 679         }
 680
 681         return false;
 682 }
 683
 684 static int autoboot_option_priority(const struct config *config,
 685                                 struct discover_boot_option *opt)
 686 {
 687         enum device_type type = opt->device->device->type;
 688         const char *uuid = opt->device->uuid;
 689         struct autoboot_option *auto_opt;
 690         unsigned int i;
 691
 692         for (i = 0; i < config->n_autoboot_opts; i++) {
 693                 auto_opt = &config->autoboot_opts[i];
 694                 if (auto_opt->boot_type == BOOT_DEVICE_UUID)
 695                         if (!strcmp(auto_opt->uuid, uuid))
 696                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 697
 698                 if (auto_opt->boot_type == BOOT_DEVICE_TYPE)
 699                         if (auto_opt->type == type ||
 700                             auto_opt->type == DEVICE_TYPE_ANY)
 701                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 702         }
 703
 704         return -1;
 705 }
 706
 707 /*
 708  * We have different priorities to resolve conflicts between boot options that
 709  * report to be the default for their device. This function assigns a priority
 710  * for these options.
 711  */
 712 static enum default_priority default_option_priority(
 713                 struct discover_boot_option *opt)
 714 {
 715         const struct config *config;
 716
 717         config = config_get();
 718
 719         /* We give highest priority to IPMI-configured boot options. If
 720          * we have an IPMI bootdev configuration set, then we don't allow
 721          * any other defaults */
 722         if (config->ipmi_bootdev) {
 723                 bool ipmi_match = ipmi_device_type_matches(config->ipmi_bootdev,
 724                                 opt->device->device->type);
 725                 if (ipmi_match)
 726                         return DEFAULT_PRIORITY_REMOTE;
 727
 728                 pb_debug("handler: disabled default priority due to "
 729                                 "non-matching IPMI type %x\n",
 730                                 config->ipmi_bootdev);
 731                 return DEFAULT_PRIORITY_DISABLED;
 732         }
 733
 734         /* Next, try to match the option against the user-defined autoboot
 735          * options, either by device UUID or type. */
 736         if (config->n_autoboot_opts) {
 737                 int boot_match = autoboot_option_priority(config, opt);
 738                 if (boot_match > 0)
 739                         return boot_match;
 740         }
 741
 742         /* If the option didn't match any entry in the array, it is disabled */
 743         pb_debug("handler: disabled default priority due to "
 744                         "non-matching UUID or type\n");
 745         return DEFAULT_PRIORITY_DISABLED;
 746 }
 747
 748 static void set_default(struct device_handler *handler,
 749                 struct discover_boot_option *opt)
 750 {
 751         enum default_priority cur_prio, new_prio;
 752
 753         if (!handler->autoboot_enabled)
 754                 return;
 755
 756         pb_debug("handler: new default option: %s\n", opt->option->id);
 757
 758         new_prio = default_option_priority(opt);
 759
 760         /* Anything outside our range prevents a default boot */
 761         if (new_prio >= DEFAULT_PRIORITY_DISABLED)
 762                 return;
 763
 764         pb_debug("handler: calculated priority %d\n", new_prio);
 765
 766         /* Resolve any conflicts: if we have a new default option, it only
 767          * replaces the current if it has a higher priority. */
 768         if (handler->default_boot_option) {
 769
 770                 cur_prio = handler->default_boot_option_priority;
 771
 772                 if (new_prio < cur_prio) {
 773                         pb_log("handler: new prio %d beats "
 774                                         "old prio %d for %s\n",
 775                                         new_prio, cur_prio,
 776                                         handler->default_boot_option
 777                                                 ->option->id);
 778                         handler->default_boot_option = opt;
 779                         handler->default_boot_option_priority = new_prio;
 780                         /* extend the timeout a little, so the user sees some
 781                          * indication of the change */
 782                         handler->sec_to_boot += 2;
 783                 }
 784
 785                 return;
 786         }
 787
 788         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 789         handler->default_boot_option = opt;
 790         handler->default_boot_option_priority = new_prio;
 791
 792         pb_log("handler: boot option %s set as default, timeout %u sec.\n",
 793                opt->option->id, handler->sec_to_boot);
 794
 795         default_timeout(handler);
 796 }
 797
 798 static bool resource_is_resolved(struct resource *res)
 799 {
 800         return !res || res->resolved;
 801 }
 802
 803 /* We only use this in an assert, which will disappear if we're compiling
 804  * with NDEBUG, so we need the 'used' attribute for these builds */
 805 static bool __attribute__((used)) boot_option_is_resolved(
 806                 struct discover_boot_option *opt)
 807 {
 808         return resource_is_resolved(opt->boot_image) &&
 809                 resource_is_resolved(opt->initrd) &&
 810                 resource_is_resolved(opt->dtb) &&
 811                 resource_is_resolved(opt->args_sig_file) &&
 812                 resource_is_resolved(opt->icon);
 813 }
 814
 815 static bool resource_resolve(struct resource *res, const char *name,
 816                 struct discover_boot_option *opt,
 817                 struct device_handler *handler)
 818 {
 819         struct parser *parser = opt->source;
 820
 821         if (resource_is_resolved(res))
 822                 return true;
 823
 824         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
 825                         opt->option->id, name, parser->name);
 826         parser->resolve_resource(handler, res);
 827
 828         return res->resolved;
 829 }
 830
 831 static bool boot_option_resolve(struct discover_boot_option *opt,
 832                 struct device_handler *handler)
 833 {
 834         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 835                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 836                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 837                 resource_resolve(opt->args_sig_file, "args_sig_file", opt,
 838                         handler) &&
 839                 resource_resolve(opt->icon, "icon", opt, handler);
 840 }
 841
 842 static void boot_option_finalise(struct device_handler *handler,
 843                 struct discover_boot_option *opt)
 844 {
 845         assert(boot_option_is_resolved(opt));
 846
 847         /* check that the parsers haven't set any of the final data */
 848         assert(!opt->option->boot_image_file);
 849         assert(!opt->option->initrd_file);
 850         assert(!opt->option->dtb_file);
 851         assert(!opt->option->icon_file);
 852         assert(!opt->option->device_id);
 853         assert(!opt->option->args_sig_file);
 854
 855         if (opt->boot_image)
 856                 opt->option->boot_image_file = opt->boot_image->url->full;
 857         if (opt->initrd)
 858                 opt->option->initrd_file = opt->initrd->url->full;
 859         if (opt->dtb)
 860                 opt->option->dtb_file = opt->dtb->url->full;
 861         if (opt->icon)
 862                 opt->option->icon_file = opt->icon->url->full;
 863         if (opt->args_sig_file)
 864                 opt->option->args_sig_file = opt->args_sig_file->url->full;
 865
 866         opt->option->device_id = opt->device->device->id;
 867
 868         if (opt->option->is_default)
 869                 set_default(handler, opt);
 870 }
 871
 872 static void notify_boot_option(struct device_handler *handler,
 873                 struct discover_boot_option *opt)
 874 {
 875         struct discover_device *dev = opt->device;
 876
 877         if (!dev->notified)
 878                 discover_server_notify_device_add(handler->server,
 879                                                   opt->device->device);
 880         dev->notified = true;
 881         discover_server_notify_boot_option_add(handler->server, opt->option);
 882 }
 883
 884 static void process_boot_option_queue(struct device_handler *handler)
 885 {
 886         struct discover_boot_option *opt, *tmp;
 887
 888         list_for_each_entry_safe(&handler->unresolved_boot_options,
 889                         opt, tmp, list) {
 890
 891                 pb_debug("queue: attempting resolution for %s\n",
 892                                 opt->option->id);
 893
 894                 if (!boot_option_resolve(opt, handler))
 895                         continue;
 896
 897                 pb_debug("\tresolved!\n");
 898
 899                 list_remove(&opt->list);
 900                 list_add_tail(&opt->device->boot_options, &opt->list);
 901                 talloc_steal(opt->device, opt);
 902                 boot_option_finalise(handler, opt);
 903                 notify_boot_option(handler, opt);
 904         }
 905 }
 906
 907 struct discover_context *device_handler_discover_context_create(
 908                 struct device_handler *handler,
 909                 struct discover_device *device)
 910 {
 911         struct discover_context *ctx;
 912
 913         ctx = talloc_zero(handler, struct discover_context);
 914         ctx->handler = handler;
 915         ctx->device = device;
 916         list_init(&ctx->boot_options);
 917
 918         return ctx;
 919 }
 920
 921 void device_handler_add_device(struct device_handler *handler,
 922                 struct discover_device *device)
 923 {
 924         handler->n_devices++;
 925         handler->devices = talloc_realloc(handler, handler->devices,
 926                                 struct discover_device *, handler->n_devices);
 927         handler->devices[handler->n_devices - 1] = device;
 928
 929         if (device->device->type == DEVICE_TYPE_NETWORK)
 930                 network_register_device(handler->network, device);
 931 }
 932
 933 void device_handler_add_ramdisk(struct device_handler *handler,
 934                 const char *path)
 935 {
 936         struct ramdisk_device *dev;
 937         unsigned int i;
 938
 939         if (!path)
 940                 return;
 941
 942         for (i = 0; i < handler->n_ramdisks; i++)
 943                 if (!strcmp(handler->ramdisks[i]->path, path))
 944                         return;
 945
 946         dev = talloc_zero(handler, struct ramdisk_device);
 947         if (!dev) {
 948                 pb_log("Failed to allocate memory to track %s\n", path);
 949                 return;
 950         }
 951
 952         dev->path = talloc_strdup(handler, path);
 953
 954         handler->ramdisks = talloc_realloc(handler, handler->ramdisks,
 955                                 struct ramdisk_device *,
 956                                 handler->n_ramdisks + 1);
 957         if (!handler->ramdisks) {
 958                 pb_log("Failed to reallocate memory"
 959                        "- ramdisk tracking inconsistent!\n");
 960                 return;
 961         }
 962
 963         handler->ramdisks[i] = dev;
 964         i = handler->n_ramdisks++;
 965 }
 966
 967 struct ramdisk_device *device_handler_get_ramdisk(
 968                 struct device_handler *handler)
 969 {
 970         unsigned int i;
 971         char *name;
 972         dev_t id;
 973
 974         /* Check if free ramdisk exists */
 975         for (i = 0; i < handler->n_ramdisks; i++)
 976                 if (!handler->ramdisks[i]->snapshot &&
 977                     !handler->ramdisks[i]->origin &&
 978                     !handler->ramdisks[i]->base)
 979                         return handler->ramdisks[i];
 980
 981         /* Otherwise create a new one */
 982         name = talloc_asprintf(handler, "/dev/ram%d",
 983                         handler->n_ramdisks);
 984         if (!name) {
 985                 pb_debug("Failed to allocate memory to name /dev/ram%d",
 986                         handler->n_ramdisks);
 987                 return NULL;
 988         }
 989
 990         id = makedev(1, handler->n_ramdisks);
 991         if (mknod(name, S_IFBLK, id)) {
 992                 if (errno == EEXIST) {
 993                         /* We haven't yet received updates for existing
 994                          * ramdisks - add and use this one */
 995                         pb_debug("Using untracked ramdisk %s\n", name);
 996                 } else {
 997                         pb_log("Failed to create new ramdisk %s: %s\n",
 998                                name, strerror(errno));
 999                         return NULL;
1000                 }
1001         }
1002         device_handler_add_ramdisk(handler, name);
1003         talloc_free(name);
1004
1005         return handler->ramdisks[i];
1006 }
1007
1008 void device_handler_release_ramdisk(struct discover_device *device)
1009 {
1010         struct ramdisk_device *ramdisk = device->ramdisk;
1011
1012         talloc_free(ramdisk->snapshot);
1013         talloc_free(ramdisk->origin);
1014         talloc_free(ramdisk->base);
1015
1016         ramdisk->snapshot = ramdisk->origin = ramdisk->base = NULL;
1017         ramdisk->sectors = 0;
1018
1019         device->ramdisk = NULL;
1020 }
1021
1022 /* Start discovery on a hotplugged device. The device will be in our devices
1023  * array, but has only just been initialised by the hotplug source.
1024  */
1025 int device_handler_discover(struct device_handler *handler,
1026                 struct discover_device *dev)
1027 {
1028         struct discover_context *ctx;
1029         int rc;
1030
1031         device_handler_status_dev_info(handler, dev,
1032                 /*
1033                  * TRANSLATORS: this string will be passed the type of the
1034                  * device (eg "disk" or "network"), which will be translated
1035                  * accordingly.
1036                  */
1037                 _("Processing new %s device"),
1038                 device_type_display_name(dev->device->type));
1039
1040         process_boot_option_queue(handler);
1041
1042         /* create our context */
1043         ctx = device_handler_discover_context_create(handler, dev);
1044
1045         rc = mount_device(dev);
1046         if (rc)
1047                 goto out;
1048
1049         /* add this device to our system info */
1050         system_info_register_blockdev(dev->device->id, dev->uuid,
1051                         dev->mount_path);
1052
1053         /* run the parsers. This will populate the ctx's boot_option list. */
1054         iterate_parsers(ctx);
1055
1056         /* add discovered stuff to the handler */
1057         device_handler_discover_context_commit(handler, ctx);
1058
1059 out:
1060         talloc_unlink(handler, ctx);
1061
1062         return 0;
1063 }
1064
1065 /* Incoming dhcp event */
1066 int device_handler_dhcp(struct device_handler *handler,
1067                 struct discover_device *dev, struct event *event)
1068 {
1069         struct discover_context *ctx;
1070
1071         device_handler_status_dev_info(handler, dev,
1072                         _("Processing DHCP lease response (ip: %s)"),
1073                         event_get_param(event, "ip"));
1074
1075         /* create our context */
1076         ctx = device_handler_discover_context_create(handler, dev);
1077         talloc_steal(ctx, event);
1078         ctx->event = event;
1079
1080         iterate_parsers(ctx);
1081
1082         device_handler_discover_context_commit(handler, ctx);
1083
1084         talloc_unlink(handler, ctx);
1085
1086         return 0;
1087 }
1088
1089 static struct discover_boot_option *find_boot_option_by_id(
1090                 struct device_handler *handler, const char *id)
1091 {
1092         unsigned int i;
1093
1094         for (i = 0; i < handler->n_devices; i++) {
1095                 struct discover_device *dev = handler->devices[i];
1096                 struct discover_boot_option *opt;
1097
1098                 list_for_each_entry(&dev->boot_options, opt, list)
1099                         if (!strcmp(opt->option->id, id))
1100                                 return opt;
1101         }
1102
1103         return NULL;
1104 }
1105
1106 void device_handler_boot(struct device_handler *handler,
1107                 struct boot_command *cmd)
1108 {
1109         struct discover_boot_option *opt = NULL;
1110
1111         if (cmd->option_id && strlen(cmd->option_id))
1112                 opt = find_boot_option_by_id(handler, cmd->option_id);
1113
1114         if (handler->pending_boot)
1115                 boot_cancel(handler->pending_boot);
1116
1117         platform_pre_boot();
1118
1119         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
1120                         device_handler_boot_status_cb, handler);
1121         handler->pending_boot_is_default = false;
1122 }
1123
1124 void device_handler_cancel_default(struct device_handler *handler)
1125 {
1126         if (handler->timeout_waiter)
1127                 waiter_remove(handler->timeout_waiter);
1128
1129         handler->timeout_waiter = NULL;
1130         handler->autoboot_enabled = false;
1131
1132         /* we only send status if we had a default boot option queued */
1133         if (!handler->default_boot_option)
1134                 return;
1135
1136         pb_log("Cancelling default boot option\n");
1137
1138         if (handler->pending_boot && handler->pending_boot_is_default) {
1139                 boot_cancel(handler->pending_boot);
1140                 handler->pending_boot = NULL;
1141                 handler->pending_boot_is_default = false;
1142         }
1143
1144         handler->default_boot_option = NULL;
1145
1146         device_handler_status_info(handler, _("Default boot cancelled"));
1147 }
1148
1149 void device_handler_update_config(struct device_handler *handler,
1150                 struct config *config)
1151 {
1152         int rc;
1153
1154         rc = config_set(config);
1155         if (rc)
1156                 return;
1157
1158         discover_server_notify_config(handler->server, config);
1159         device_handler_update_lang(config->lang);
1160         device_handler_reinit(handler);
1161 }
1162
1163 static char *device_from_addr(void *ctx, struct pb_url *url)
1164 {
1165         char *ipaddr, *buf, *tok, *dev = NULL;
1166         const char *delim = " ";
1167         struct sockaddr_in *ip;
1168         struct sockaddr_in si;
1169         struct addrinfo *res;
1170         struct process *p;
1171         int rc;
1172
1173         /* Note: IPv4 only */
1174         rc = inet_pton(AF_INET, url->host, &(si.sin_addr));
1175         if (rc > 0) {
1176                 ipaddr = url->host;
1177         } else {
1178                 /* need to turn hostname into a valid IP */
1179                 rc = getaddrinfo(url->host, NULL, NULL, &res);
1180                 if (rc) {
1181                         pb_debug("%s: Invalid URL\n",__func__);
1182                         return NULL;
1183                 }
1184                 ipaddr = talloc_array(ctx,char,INET_ADDRSTRLEN);
1185                 ip = (struct sockaddr_in *) res->ai_addr;
1186                 inet_ntop(AF_INET, &(ip->sin_addr), ipaddr, INET_ADDRSTRLEN);
1187                 freeaddrinfo(res);
1188         }
1189
1190         const char *argv[] = {
1191                 pb_system_apps.ip,
1192                 "route", "show", "to", "match",
1193                 ipaddr,
1194                 NULL
1195         };
1196
1197         p = process_create(ctx);
1198
1199         p->path = pb_system_apps.ip;
1200         p->argv = argv;
1201         p->keep_stdout = true;
1202
1203         rc = process_run_sync(p);
1204
1205         if (rc || p->exit_status) {
1206                 /* ip has complained for some reason; most likely
1207                  * there is no route to the host - bail out */
1208                 pb_debug("%s: `ip` returns non-zero exit status\n", __func__);
1209                 pb_debug("ip buf: %s\n", p->stdout_buf);
1210                 process_release(p);
1211                 return NULL;
1212         }
1213
1214         buf = p->stdout_buf;
1215         /* If a route is found, ip-route output will be of the form
1216          * "... dev DEVNAME ... " */
1217         tok = strtok(buf, delim);
1218         while (tok) {
1219                 if (!strcmp(tok, "dev")) {
1220                         tok = strtok(NULL, delim);
1221                         dev = talloc_strdup(ctx, tok);
1222                         break;
1223                 }
1224                 tok = strtok(NULL, delim);
1225         }
1226
1227         process_release(p);
1228         if (dev)
1229                 pb_debug("%s: Found interface '%s'\n", __func__,dev);
1230         return dev;
1231 }
1232
1233 void device_handler_process_url(struct device_handler *handler,
1234                 const char *url, const char *mac, const char *ip)
1235 {
1236         struct discover_context *ctx;
1237         struct discover_device *dev;
1238         struct pb_url *pb_url;
1239         struct event *event;
1240         struct param *param;
1241
1242         if (!handler->network) {
1243                 device_handler_status_err(handler, _("No network configured"));
1244                 return;
1245         }
1246
1247         event = talloc(handler, struct event);
1248         event->type = EVENT_TYPE_USER;
1249         event->action = EVENT_ACTION_URL;
1250
1251         if (url[strlen(url) - 1] == '/') {
1252                 event->params = talloc_array(event, struct param, 3);
1253                 param = &event->params[0];
1254                 param->name = talloc_strdup(event, "pxepathprefix");
1255                 param->value = talloc_strdup(event, url);
1256                 param = &event->params[1];
1257                 param->name = talloc_strdup(event, "mac");
1258                 param->value = talloc_strdup(event, mac);
1259                 param = &event->params[2];
1260                 param->name = talloc_strdup(event, "ip");
1261                 param->value = talloc_strdup(event, ip);
1262                 event->n_params = 3;
1263         } else {
1264                 event->params = talloc_array(event, struct param, 1);
1265                 param = &event->params[0];
1266                 param->name = talloc_strdup(event, "pxeconffile");
1267                 param->value = talloc_strdup(event, url);
1268                 event->n_params = 1;
1269         }
1270
1271         pb_url = pb_url_parse(event, event->params->value);
1272         if (!pb_url || (pb_url->scheme != pb_url_file && !pb_url->host)) {
1273                 device_handler_status_err(handler, _("Invalid config URL!"));
1274                 return;
1275         }
1276
1277         if (pb_url->scheme == pb_url_file)
1278                 event->device = talloc_asprintf(event, "local");
1279         else
1280                 event->device = device_from_addr(event, pb_url);
1281
1282         if (!event->device) {
1283                 device_handler_status_err(handler,
1284                                         _("Unable to route to host %s"),
1285                                         pb_url->host);
1286                 return;
1287         }
1288
1289         dev = discover_device_create(handler, mac, event->device);
1290         if (pb_url->scheme == pb_url_file)
1291                 dev->device->type = DEVICE_TYPE_ANY;
1292         ctx = device_handler_discover_context_create(handler, dev);
1293         talloc_steal(ctx, event);
1294         ctx->event = event;
1295
1296         iterate_parsers(ctx);
1297
1298         device_handler_discover_context_commit(handler, ctx);
1299
1300         talloc_unlink(handler, ctx);
1301 }
1302
1303 #ifndef PETITBOOT_TEST
1304
1305 /**
1306  * context_commit - Commit a temporary discovery context to the handler,
1307  * and notify the clients about any new options / devices
1308  */
1309 void device_handler_discover_context_commit(struct device_handler *handler,
1310                 struct discover_context *ctx)
1311 {
1312         struct discover_device *dev = ctx->device;
1313         struct discover_boot_option *opt, *tmp;
1314
1315         if (!device_lookup_by_uuid(handler, dev->uuid))
1316                 device_handler_add_device(handler, dev);
1317
1318         /* move boot options from the context to the device */
1319         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
1320                 list_remove(&opt->list);
1321
1322                 /* All boot options need at least a kernel image */
1323                 if (!opt->boot_image || !opt->boot_image->url) {
1324                         pb_log("boot option %s is missing boot image, ignoring\n",
1325                                 opt->option->id);
1326                         talloc_free(opt);
1327                         continue;
1328                 }
1329
1330                 if (boot_option_resolve(opt, handler)) {
1331                         pb_log("boot option %s is resolved, "
1332                                         "sending to clients\n",
1333                                         opt->option->id);
1334                         list_add_tail(&dev->boot_options, &opt->list);
1335                         talloc_steal(dev, opt);
1336                         boot_option_finalise(handler, opt);
1337                         notify_boot_option(handler, opt);
1338                 } else {
1339                         if (!opt->source->resolve_resource) {
1340                                 pb_log("parser %s gave us an unresolved "
1341                                         "resource (%s), but no way to "
1342                                         "resolve it\n",
1343                                         opt->source->name, opt->option->id);
1344                                 talloc_free(opt);
1345                         } else {
1346                                 pb_log("boot option %s is unresolved, "
1347                                                 "adding to queue\n",
1348                                                 opt->option->id);
1349                                 list_add(&handler->unresolved_boot_options,
1350                                                 &opt->list);
1351                                 talloc_steal(handler, opt);
1352                         }
1353                 }
1354         }
1355 }
1356
1357 static void device_handler_update_lang(const char *lang)
1358 {
1359         const char *cur_lang;
1360
1361         if (!lang)
1362                 return;
1363
1364         cur_lang = setlocale(LC_ALL, NULL);
1365         if (cur_lang && !strcmp(cur_lang, lang))
1366                 return;
1367
1368         setlocale(LC_ALL, lang);
1369 }
1370
1371 static int device_handler_init_sources(struct device_handler *handler)
1372 {
1373         /* init our device sources: udev, network and user events */
1374         handler->udev = udev_init(handler, handler->waitset);
1375         if (!handler->udev)
1376                 return -1;
1377
1378         handler->network = network_init(handler, handler->waitset,
1379                         handler->dry_run);
1380         if (!handler->network)
1381                 return -1;
1382
1383         handler->user_event = user_event_init(handler, handler->waitset);
1384         if (!handler->user_event)
1385                 return -1;
1386
1387         return 0;
1388 }
1389
1390 static void device_handler_reinit_sources(struct device_handler *handler)
1391 {
1392         /* if we haven't initialised sources previously (becuase we started in
1393          * safe mode), then init once here. */
1394         if (!(handler->udev || handler->network || handler->user_event)) {
1395                 device_handler_init_sources(handler);
1396                 return;
1397         }
1398
1399         udev_reinit(handler->udev);
1400
1401         network_shutdown(handler->network);
1402         handler->network = network_init(handler, handler->waitset,
1403                         handler->dry_run);
1404 }
1405
1406 static inline const char *get_device_path(struct discover_device *dev)
1407 {
1408         return dev->ramdisk ? dev->ramdisk->snapshot : dev->device_path;
1409 }
1410
1411 static char *check_subvols(struct discover_device *dev)
1412 {
1413         const char *fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1414         struct stat sb;
1415         char *path;
1416         int rc;
1417
1418         if (strncmp(fstype, "btrfs", strlen("btrfs")))
1419                 return dev->mount_path;
1420
1421         /* On btrfs a device's root may be under a subvolume path */
1422         path = join_paths(dev, dev->mount_path, "@");
1423         rc = stat(path, &sb);
1424         if (!rc && S_ISDIR(sb.st_mode)) {
1425                 pb_debug("Using '%s' for btrfs root path\n", path);
1426                 return path;
1427         }
1428
1429         talloc_free(path);
1430         return dev->mount_path;
1431 }
1432
1433 static bool check_existing_mount(struct discover_device *dev)
1434 {
1435         struct stat devstat, mntstat;
1436         const char *device_path;
1437         struct mntent *mnt;
1438         FILE *fp;
1439         int rc;
1440
1441         device_path = get_device_path(dev);
1442
1443         rc = stat(device_path, &devstat);
1444         if (rc) {
1445                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
1446                 return false;
1447         }
1448
1449         if (!S_ISBLK(devstat.st_mode)) {
1450                 pb_debug("%s: %s isn't a block device?\n", __func__,
1451                                 dev->device_path);
1452                 return false;
1453         }
1454
1455         fp = fopen("/proc/self/mounts", "r");
1456
1457         for (;;) {
1458                 mnt = getmntent(fp);
1459                 if (!mnt)
1460                         break;
1461
1462                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
1463                         continue;
1464
1465                 rc = stat(mnt->mnt_fsname, &mntstat);
1466                 if (rc)
1467                         continue;
1468
1469                 if (!S_ISBLK(mntstat.st_mode))
1470                         continue;
1471
1472                 if (mntstat.st_rdev == devstat.st_rdev) {
1473                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
1474                         dev->root_path = check_subvols(dev);
1475                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
1476                         dev->mounted = true;
1477                         dev->unmount = false;
1478
1479                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
1480                                         __func__, dev->device_path,
1481                                         dev->mounted_rw ? 'w' : 'o',
1482                                         mnt->mnt_dir);
1483                         break;
1484                 }
1485         }
1486
1487         fclose(fp);
1488
1489         return mnt != NULL;
1490 }
1491
1492 /*
1493  * Attempt to mount a filesystem safely, while handling certain filesytem-
1494  * specific options
1495  */
1496 static int try_mount(const char *device_path, const char *mount_path,
1497                              const char *fstype, unsigned long flags,
1498                              bool have_snapshot)
1499 {
1500         const char *fs, *safe_opts;
1501         int rc;
1502
1503         /* Mount ext3 as ext4 instead so 'norecovery' can be used */
1504         if (strncmp(fstype, "ext3", strlen("ext3")) == 0) {
1505                 pb_debug("Mounting ext3 filesystem as ext4\n");
1506                 fs = "ext4";
1507         } else
1508                 fs = fstype;
1509
1510         if (strncmp(fs, "xfs", strlen("xfs")) == 0 ||
1511             strncmp(fs, "ext4", strlen("ext4")) == 0)
1512                 safe_opts = "norecovery";
1513         else
1514                 safe_opts = NULL;
1515
1516         errno = 0;
1517         /* If no snapshot is available don't attempt recovery */
1518         if (!have_snapshot)
1519                 return mount(device_path, mount_path, fs, flags, safe_opts);
1520
1521         rc = mount(device_path, mount_path, fs, flags, NULL);
1522
1523         if (!rc)
1524                 return rc;
1525
1526         /* Mounting failed; some filesystems will fail to mount if a recovery
1527          * journal exists (eg. cross-endian XFS), so try again with norecovery
1528          * where that option is available.
1529          * If mounting read-write just return the error as norecovery is not a
1530          * valid option */
1531         if ((flags & MS_RDONLY) != MS_RDONLY || !safe_opts)
1532                 return rc;
1533
1534         errno = 0;
1535         return mount(device_path, mount_path, fs, flags, safe_opts);
1536 }
1537
1538 static int mount_device(struct discover_device *dev)
1539 {
1540         const char *fstype, *device_path;
1541         int rc;
1542
1543         if (!dev->device_path)
1544                 return -1;
1545
1546         if (dev->mounted)
1547                 return 0;
1548
1549         if (check_existing_mount(dev))
1550                 return 0;
1551
1552         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1553         if (!fstype)
1554                 return 0;
1555
1556         dev->mount_path = join_paths(dev, mount_base(),
1557                                         dev->device_path);
1558
1559         if (pb_mkdir_recursive(dev->mount_path)) {
1560                 pb_log("couldn't create mount directory %s: %s\n",
1561                                 dev->mount_path, strerror(errno));
1562                 goto err_free;
1563         }
1564
1565         device_path = get_device_path(dev);
1566
1567         pb_log("mounting device %s read-only\n", dev->device_path);
1568         rc = try_mount(device_path, dev->mount_path, fstype,
1569                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1570
1571         if (!rc) {
1572                 dev->mounted = true;
1573                 dev->mounted_rw = false;
1574                 dev->unmount = true;
1575                 dev->root_path = check_subvols(dev);
1576                 return 0;
1577         }
1578
1579         pb_log("couldn't mount device %s: mount failed: %s\n",
1580                         device_path, strerror(errno));
1581
1582         /* If mount fails clean up any snapshot */
1583         devmapper_destroy_snapshot(dev);
1584
1585         pb_rmdir_recursive(mount_base(), dev->mount_path);
1586 err_free:
1587         talloc_free(dev->mount_path);
1588         dev->mount_path = NULL;
1589         return -1;
1590 }
1591
1592 static int umount_device(struct discover_device *dev)
1593 {
1594         const char *device_path;
1595         int rc;
1596
1597         if (!dev->mounted || !dev->unmount)
1598                 return 0;
1599
1600         device_path = get_device_path(dev);
1601
1602         pb_log("unmounting device %s\n", device_path);
1603         rc = umount(dev->mount_path);
1604         if (rc)
1605                 return -1;
1606
1607         dev->mounted = false;
1608         devmapper_destroy_snapshot(dev);
1609
1610         pb_rmdir_recursive(mount_base(), dev->mount_path);
1611
1612         talloc_free(dev->mount_path);
1613         dev->mount_path = NULL;
1614         dev->root_path = NULL;
1615
1616         return 0;
1617 }
1618
1619 int device_request_write(struct discover_device *dev, bool *release)
1620 {
1621         const char *fstype, *device_path;
1622         const struct config *config;
1623         int rc;
1624
1625         *release = false;
1626
1627         config = config_get();
1628         if (!config->allow_writes)
1629                 return -1;
1630
1631         if (!dev->mounted)
1632                 return -1;
1633
1634         if (dev->mounted_rw)
1635                 return 0;
1636
1637         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1638
1639         device_path = get_device_path(dev);
1640
1641         pb_log("remounting device %s read-write\n", device_path);
1642
1643         rc = umount(dev->mount_path);
1644         if (rc) {
1645                 pb_log("Failed to unmount %s: %s\n",
1646                        dev->mount_path, strerror(errno));
1647                 return -1;
1648         }
1649
1650         rc = try_mount(device_path, dev->mount_path, fstype,
1651                        MS_SILENT, dev->ramdisk);
1652         if (rc)
1653                 goto mount_ro;
1654
1655         dev->mounted_rw = true;
1656         *release = true;
1657         return 0;
1658
1659 mount_ro:
1660         pb_log("Unable to remount device %s read-write: %s\n",
1661                device_path, strerror(errno));
1662         rc = try_mount(device_path, dev->mount_path, fstype,
1663                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1664         if (rc)
1665                 pb_log("Unable to recover mount for %s: %s\n",
1666                        device_path, strerror(errno));
1667         return -1;
1668 }
1669
1670 void device_release_write(struct discover_device *dev, bool release)
1671 {
1672         const char *fstype, *device_path;
1673
1674         if (!release)
1675                 return;
1676
1677         device_path = get_device_path(dev);
1678
1679         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1680
1681         pb_log("remounting device %s read-only\n", device_path);
1682
1683         if (umount(dev->mount_path)) {
1684                 pb_log("Failed to unmount %s\n", dev->mount_path);
1685                 return;
1686         }
1687         dev->mounted_rw = dev->mounted = false;
1688
1689         if (dev->ramdisk) {
1690                 devmapper_merge_snapshot(dev);
1691                 /* device_path becomes stale after merge */
1692                 device_path = get_device_path(dev);
1693         }
1694
1695         if (try_mount(device_path, dev->mount_path, fstype,
1696                        MS_RDONLY | MS_SILENT, dev->ramdisk))
1697                 pb_log("Failed to remount %s read-only: %s\n",
1698                        device_path, strerror(errno));
1699         else
1700                 dev->mounted = true;
1701 }
1702
1703 void device_sync_snapshots(struct device_handler *handler, const char *device)
1704 {
1705         struct discover_device *dev = NULL;
1706         unsigned int i;
1707
1708         if (device) {
1709                 /* Find matching device and sync */
1710                 dev = device_lookup_by_name(handler, device);
1711                 if (!dev) {
1712                         pb_log("%s: device name '%s' unrecognised\n",
1713                                 __func__, device);
1714                         return;
1715                 }
1716                 if (dev->ramdisk)
1717                         device_release_write(dev, true);
1718                 else
1719                         pb_log("%s has no snapshot to merge, skipping\n",
1720                                 dev->device->id);
1721                 return;
1722         }
1723
1724         /* Otherwise sync all relevant devices */
1725         for (i = 0; i < handler->n_devices; i++) {
1726                 dev = handler->devices[i];
1727                 if (dev->device->type != DEVICE_TYPE_DISK &&
1728                         dev->device->type != DEVICE_TYPE_USB)
1729                         continue;
1730                 if (dev->ramdisk)
1731                         device_release_write(dev, true);
1732                 else
1733                         pb_log("%s has no snapshot to merge, skipping\n",
1734                                 dev->device->id);
1735         }
1736 }
1737
1738 #else
1739
1740 void device_handler_discover_context_commit(
1741                 struct device_handler *handler __attribute__((unused)),
1742                 struct discover_context *ctx __attribute__((unused)))
1743 {
1744         pb_log("%s stubbed out for test cases\n", __func__);
1745 }
1746
1747 static void device_handler_update_lang(const char *lang __attribute__((unused)))
1748 {
1749 }
1750
1751 static int device_handler_init_sources(
1752                 struct device_handler *handler __attribute__((unused)))
1753 {
1754         return 0;
1755 }
1756
1757 static void device_handler_reinit_sources(
1758                 struct device_handler *handler __attribute__((unused)))
1759 {
1760 }
1761
1762 static int umount_device(struct discover_device *dev __attribute__((unused)))
1763 {
1764         return 0;
1765 }
1766
1767 static int __attribute__((unused)) mount_device(
1768                 struct discover_device *dev __attribute__((unused)))
1769 {
1770         return 0;
1771 }
1772
1773 int device_request_write(struct discover_device *dev __attribute__((unused)),
1774                 bool *release)
1775 {
1776         *release = true;
1777         return 0;
1778 }
1779
1780 void device_release_write(struct discover_device *dev __attribute__((unused)),
1781         bool release __attribute__((unused)))
1782 {
1783 }
1784
1785 void device_sync_snapshots(
1786                 struct device_handler *handler __attribute__((unused)),
1787                 const char *device __attribute__((unused)))
1788 {
1789 }
1790
1791 #endif