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 #include <pb-config/pb-config.h>
  22
  23 #include <sys/sysmacros.h>
  24 #include <sys/types.h>
  25 #include <sys/socket.h>
  26 #include <netdb.h>
  27 #include <arpa/inet.h>
  28
  29 #include "device-handler.h"
  30 #include "discover-server.h"
  31 #include "devmapper.h"
  32 #include "user-event.h"
  33 #include "platform.h"
  34 #include "event.h"
  35 #include "parser.h"
  36 #include "resource.h"
  37 #include "paths.h"
  38 #include "sysinfo.h"
  39 #include "boot.h"
  40 #include "udev.h"
  41 #include "network.h"
  42 #include "ipmi.h"
  43
  44 enum default_priority {
  45         DEFAULT_PRIORITY_REMOTE         = 1,
  46         DEFAULT_PRIORITY_LOCAL_FIRST    = 2,
  47         DEFAULT_PRIORITY_LOCAL_LAST     = 0xfe,
  48         DEFAULT_PRIORITY_DISABLED       = 0xff,
  49 };
  50
  51 struct progress_info {
  52         unsigned int                    percentage;
  53         unsigned long                   size;           /* size in bytes */
  54
  55         const struct process_info       *procinfo;
  56         struct list_item        list;
  57 };
  58
  59 struct device_handler {
  60         struct discover_server  *server;
  61         int                     dry_run;
  62
  63         struct pb_udev          *udev;
  64         struct network          *network;
  65         struct user_event       *user_event;
  66
  67         struct discover_device  **devices;
  68         unsigned int            n_devices;
  69
  70         struct ramdisk_device   **ramdisks;
  71         unsigned int            n_ramdisks;
  72
  73         struct waitset          *waitset;
  74         struct waiter           *timeout_waiter;
  75         bool                    autoboot_enabled;
  76         unsigned int            sec_to_boot;
  77
  78         struct discover_boot_option *default_boot_option;
  79         int                     default_boot_option_priority;
  80
  81         struct list             unresolved_boot_options;
  82
  83         struct boot_task        *pending_boot;
  84         bool                    pending_boot_is_default;
  85
  86         struct list             progress;
  87         unsigned int            n_progress;
  88 };
  89
  90 static int mount_device(struct discover_device *dev);
  91 static int umount_device(struct discover_device *dev);
  92
  93 static int device_handler_init_sources(struct device_handler *handler);
  94 static void device_handler_reinit_sources(struct device_handler *handler);
  95
  96 static void device_handler_update_lang(const char *lang);
  97
  98 void discover_context_add_boot_option(struct discover_context *ctx,
  99                 struct discover_boot_option *boot_option)
 100 {
 101         boot_option->source = ctx->parser;
 102         list_add_tail(&ctx->boot_options, &boot_option->list);
 103         talloc_steal(ctx, boot_option);
 104 }
 105
 106 /**
 107  * device_handler_get_device_count - Get the count of current handler devices.
 108  */
 109
 110 int device_handler_get_device_count(const struct device_handler *handler)
 111 {
 112         return handler->n_devices;
 113 }
 114
 115 /**
 116  * device_handler_get_device - Get a handler device by index.
 117  */
 118
 119 const struct discover_device *device_handler_get_device(
 120         const struct device_handler *handler, unsigned int index)
 121 {
 122         if (index >= handler->n_devices) {
 123                 assert(0 && "bad index");
 124                 return NULL;
 125         }
 126
 127         return handler->devices[index];
 128 }
 129
 130 struct network *device_handler_get_network(
 131                 const struct device_handler *handler)
 132 {
 133         return handler->network;
 134 }
 135
 136 struct discover_boot_option *discover_boot_option_create(
 137                 struct discover_context *ctx,
 138                 struct discover_device *device)
 139 {
 140         struct discover_boot_option *opt;
 141
 142         opt = talloc_zero(ctx, struct discover_boot_option);
 143         opt->option = talloc_zero(opt, struct boot_option);
 144         opt->device = device;
 145
 146         return opt;
 147 }
 148
 149 static int device_match_uuid(struct discover_device *dev, const char *uuid)
 150 {
 151         return dev->uuid && !strcmp(dev->uuid, uuid);
 152 }
 153
 154 static int device_match_label(struct discover_device *dev, const char *label)
 155 {
 156         return dev->label && !strcmp(dev->label, label);
 157 }
 158
 159 static int device_match_id(struct discover_device *dev, const char *id)
 160 {
 161         return !strcmp(dev->device->id, id);
 162 }
 163
 164 static int device_match_serial(struct discover_device *dev, const char *serial)
 165 {
 166         const char *val = discover_device_get_param(dev, "ID_SERIAL");
 167         return val && !strcmp(val, serial);
 168 }
 169
 170 static struct discover_device *device_lookup(
 171                 struct device_handler *device_handler,
 172                 int (match_fn)(struct discover_device *, const char *),
 173                 const char *str)
 174 {
 175         struct discover_device *dev;
 176         unsigned int i;
 177
 178         if (!str)
 179                 return NULL;
 180
 181         for (i = 0; i < device_handler->n_devices; i++) {
 182                 dev = device_handler->devices[i];
 183
 184                 if (match_fn(dev, str))
 185                         return dev;
 186         }
 187
 188         return NULL;
 189 }
 190
 191 struct discover_device *device_lookup_by_name(struct device_handler *handler,
 192                 const char *name)
 193 {
 194         if (!strncmp(name, "/dev/", strlen("/dev/")))
 195                 name += strlen("/dev/");
 196
 197         return device_lookup_by_id(handler, name);
 198 }
 199
 200 struct discover_device *device_lookup_by_uuid(
 201                 struct device_handler *device_handler,
 202                 const char *uuid)
 203 {
 204         return device_lookup(device_handler, device_match_uuid, uuid);
 205 }
 206
 207 struct discover_device *device_lookup_by_label(
 208                 struct device_handler *device_handler,
 209                 const char *label)
 210 {
 211         return device_lookup(device_handler, device_match_label, label);
 212 }
 213
 214 struct discover_device *device_lookup_by_id(
 215                 struct device_handler *device_handler,
 216                 const char *id)
 217 {
 218         return device_lookup(device_handler, device_match_id, id);
 219 }
 220
 221 struct discover_device *device_lookup_by_serial(
 222                 struct device_handler *device_handler,
 223                 const char *serial)
 224 {
 225         return device_lookup(device_handler, device_match_serial, serial);
 226 }
 227
 228 void device_handler_destroy(struct device_handler *handler)
 229 {
 230         talloc_free(handler);
 231 }
 232
 233 static int destroy_device(void *arg)
 234 {
 235         struct discover_device *dev = arg;
 236
 237         umount_device(dev);
 238
 239         return 0;
 240 }
 241
 242 struct discover_device *discover_device_create(struct device_handler *handler,
 243                 const char *uuid, const char *id)
 244 {
 245         struct discover_device *dev;
 246
 247         if (uuid)
 248                 dev = device_lookup_by_uuid(handler, uuid);
 249         else
 250                 dev = device_lookup_by_id(handler, id);
 251
 252         if (dev)
 253                 return dev;
 254
 255         dev = talloc_zero(handler, struct discover_device);
 256         dev->device = talloc_zero(dev, struct device);
 257         dev->device->id = talloc_strdup(dev->device, id);
 258         dev->uuid = talloc_strdup(dev, uuid);
 259         list_init(&dev->params);
 260         list_init(&dev->boot_options);
 261
 262         talloc_set_destructor(dev, destroy_device);
 263
 264         return dev;
 265 }
 266
 267 struct discover_device_param {
 268         char                    *name;
 269         char                    *value;
 270         struct list_item        list;
 271 };
 272
 273 void discover_device_set_param(struct discover_device *device,
 274                 const char *name, const char *value)
 275 {
 276         struct discover_device_param *param;
 277         bool found = false;
 278
 279         list_for_each_entry(&device->params, param, list) {
 280                 if (!strcmp(param->name, name)) {
 281                         found = true;
 282                         break;
 283                 }
 284         }
 285
 286         if (!found) {
 287                 if (!value)
 288                         return;
 289                 param = talloc(device, struct discover_device_param);
 290                 param->name = talloc_strdup(param, name);
 291                 list_add(&device->params, &param->list);
 292         } else {
 293                 if (!value) {
 294                         list_remove(&param->list);
 295                         talloc_free(param);
 296                         return;
 297                 }
 298                 talloc_free(param->value);
 299         }
 300
 301         param->value = talloc_strdup(param, value);
 302 }
 303
 304 const char *discover_device_get_param(struct discover_device *device,
 305                 const char *name)
 306 {
 307         struct discover_device_param *param;
 308
 309         list_for_each_entry(&device->params, param, list) {
 310                 if (!strcmp(param->name, name))
 311                         return param->value;
 312         }
 313         return NULL;
 314 }
 315
 316 static void set_env_variables(const struct config *config)
 317 {
 318         if (config->http_proxy)
 319                 setenv("http_proxy", config->http_proxy, 1);
 320         else
 321                 unsetenv("http_proxy");
 322
 323         if (config->https_proxy)
 324                 setenv("https_proxy", config->https_proxy, 1);
 325         else
 326                 unsetenv("https_proxy");
 327
 328         /* Reduce noise in the log from LVM listing open file descriptors */
 329         setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1);
 330 }
 331
 332 struct device_handler *device_handler_init(struct discover_server *server,
 333                 struct waitset *waitset, int dry_run)
 334 {
 335         struct device_handler *handler;
 336         int rc;
 337
 338         handler = talloc_zero(NULL, struct device_handler);
 339         handler->server = server;
 340         handler->waitset = waitset;
 341         handler->dry_run = dry_run;
 342         handler->autoboot_enabled = config_autoboot_active(config_get());
 343
 344         list_init(&handler->unresolved_boot_options);
 345
 346         list_init(&handler->progress);
 347
 348         /* set up our mount point base */
 349         pb_mkdir_recursive(mount_base());
 350
 351         parser_init();
 352
 353         if (config_get()->safe_mode)
 354                 return handler;
 355
 356         set_env_variables(config_get());
 357
 358         rc = device_handler_init_sources(handler);
 359         if (rc) {
 360                 talloc_free(handler);
 361                 return NULL;
 362         }
 363
 364         return handler;
 365 }
 366
 367 void device_handler_reinit(struct device_handler *handler)
 368 {
 369         struct discover_boot_option *opt, *tmp;
 370         struct ramdisk_device *ramdisk;
 371         struct config *config;
 372         unsigned int i;
 373
 374         device_handler_cancel_default(handler);
 375         /* Cancel any pending non-default boot */
 376         if (handler->pending_boot) {
 377                 boot_cancel(handler->pending_boot);
 378                 handler->pending_boot = NULL;
 379                 handler->pending_boot_is_default = false;
 380         }
 381
 382         /* Cancel any remaining async jobs */
 383         process_stop_async_all();
 384         pending_network_jobs_cancel();
 385
 386         /* free unresolved boot options */
 387         list_for_each_entry_safe(&handler->unresolved_boot_options,
 388                         opt, tmp, list)
 389                 talloc_free(opt);
 390         list_init(&handler->unresolved_boot_options);
 391
 392         /* drop all devices */
 393         for (i = 0; i < handler->n_devices; i++) {
 394                 discover_server_notify_device_remove(handler->server,
 395                                 handler->devices[i]->device);
 396                 ramdisk = handler->devices[i]->ramdisk;
 397                 talloc_free(handler->devices[i]);
 398                 talloc_free(ramdisk);
 399         }
 400
 401         talloc_free(handler->devices);
 402         handler->devices = NULL;
 403         handler->n_devices = 0;
 404         talloc_free(handler->ramdisks);
 405         handler->ramdisks = NULL;
 406         handler->n_ramdisks = 0;
 407
 408         set_env_variables(config_get());
 409
 410         /* If the safe mode warning was active disable it now */
 411         if (config_get()->safe_mode) {
 412                 config = config_copy(handler, config_get());
 413                 config->safe_mode = false;
 414                 config_set(config);
 415                 discover_server_notify_config(handler->server, config);
 416         }
 417
 418         device_handler_reinit_sources(handler);
 419 }
 420
 421 void device_handler_remove(struct device_handler *handler,
 422                 struct discover_device *device)
 423 {
 424         struct discover_boot_option *opt, *tmp;
 425         unsigned int i;
 426
 427         list_for_each_entry_safe(&device->boot_options, opt, tmp, list) {
 428                 if (opt == handler->default_boot_option) {
 429                         pb_log("Default option %s cancelled since device removed",
 430                                         opt->option->name);
 431                         device_handler_cancel_default(handler);
 432                         break;
 433                 }
 434         }
 435
 436         for (i = 0; i < handler->n_devices; i++)
 437                 if (handler->devices[i] == device)
 438                         break;
 439
 440         if (i == handler->n_devices) {
 441                 talloc_free(device);
 442                 return;
 443         }
 444
 445         /* Free any unresolved options, as they're currently allocated
 446          * against the handler */
 447         list_for_each_entry_safe(&handler->unresolved_boot_options,
 448                         opt, tmp, list) {
 449                 if (opt->device != device)
 450                         continue;
 451                 list_remove(&opt->list);
 452                 talloc_free(opt);
 453         }
 454
 455         /* if this is a network device, we have to unregister it from the
 456          * network code */
 457         if (device->device->type == DEVICE_TYPE_NETWORK)
 458                 network_unregister_device(handler->network, device);
 459
 460         handler->n_devices--;
 461         memmove(&handler->devices[i], &handler->devices[i + 1],
 462                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 463         handler->devices = talloc_realloc(handler, handler->devices,
 464                 struct discover_device *, handler->n_devices);
 465
 466         if (device->notified)
 467                 discover_server_notify_device_remove(handler->server,
 468                                                         device->device);
 469
 470         talloc_free(device);
 471 }
 472
 473 void device_handler_status(struct device_handler *handler,
 474                 struct status *status)
 475 {
 476         discover_server_notify_boot_status(handler->server, status);
 477 }
 478
 479 static void _device_handler_vstatus(struct device_handler *handler,
 480                 enum status_type type, const char *fmt, va_list ap)
 481 {
 482         struct status status;
 483
 484         status.type = type;
 485         status.message = talloc_vasprintf(handler, fmt, ap);
 486         status.backlog = false;
 487
 488         device_handler_status(handler, &status);
 489
 490         talloc_free(status.message);
 491 }
 492
 493 static void _device_handler_vdevstatus(struct device_handler *handler,
 494                 struct discover_device *device, enum status_type type,
 495                 const char *fmt, va_list ap)
 496 {
 497         char *msg;
 498
 499         msg = talloc_asprintf(handler, "[%s] %s",
 500                         device ? device->device->id : "unknown", fmt);
 501         _device_handler_vstatus(handler, type, msg, ap);
 502         talloc_free(msg);
 503 }
 504
 505 void device_handler_status_dev_info(struct device_handler *handler,
 506                 struct discover_device *dev, const char *fmt, ...)
 507 {
 508         va_list ap;
 509
 510         va_start(ap, fmt);
 511         _device_handler_vdevstatus(handler, dev, STATUS_INFO, fmt, ap);
 512         va_end(ap);
 513 }
 514
 515 void device_handler_status_dev_err(struct device_handler *handler,
 516                 struct discover_device *dev, const char *fmt, ...)
 517 {
 518         va_list ap;
 519
 520         va_start(ap, fmt);
 521         _device_handler_vdevstatus(handler, dev, STATUS_ERROR, fmt, ap);
 522         va_end(ap);
 523 }
 524
 525 void device_handler_status_info(struct device_handler *handler,
 526                 const char *fmt, ...)
 527 {
 528         va_list ap;
 529
 530         va_start(ap, fmt);
 531         _device_handler_vstatus(handler, STATUS_INFO, fmt, ap);
 532         va_end(ap);
 533 }
 534
 535 void device_handler_status_err(struct device_handler *handler,
 536                 const char *fmt, ...)
 537 {
 538         va_list ap;
 539
 540         va_start(ap, fmt);
 541         _device_handler_vstatus(handler, STATUS_ERROR, fmt, ap);
 542         va_end(ap);
 543 }
 544
 545 void device_handler_status_download(struct device_handler *handler,
 546                 const struct process_info *procinfo,
 547                 unsigned int percentage, unsigned int size, char suffix)
 548 {
 549         struct progress_info *p, *progress = NULL;
 550         uint64_t current_converted, current = 0;
 551         const char *units = " kMGTP";
 552         unsigned long size_bytes;
 553         char *update = NULL;
 554         double total = 0;
 555         unsigned int i;
 556         int unit = 0;
 557
 558         list_for_each_entry(&handler->progress, p, list)
 559                 if (p->procinfo == procinfo)
 560                         progress = p;
 561
 562         if (!progress) {
 563                 pb_log("Registering new progress struct\n");
 564                 progress = talloc_zero(handler, struct progress_info);
 565                 if (!progress) {
 566                         pb_log("Failed to allocate room for progress struct\n");
 567                         return;
 568                 }
 569                 progress->procinfo = procinfo;
 570                 list_add(&handler->progress, &progress->list);
 571                 handler->n_progress++;
 572         }
 573
 574         size_bytes = size;
 575         for (i = 0; i < strlen(units); i++) {
 576                 if (units[i] == suffix)
 577                         break;
 578         }
 579
 580         if (i >= strlen(units)) {
 581             pb_log("Couldn't recognise suffix '%c'\n", suffix);
 582             size_bytes = 0;
 583         } else {
 584                 while (i--)
 585                         size_bytes <<= 10;
 586         }
 587
 588         progress->percentage = percentage;
 589         progress->size = size_bytes;
 590
 591         /*
 592          * Aggregate the info we have and update status. If a progress struct
 593          * has zero for both percentage and size we assume progress information
 594          * is unavailable and fall back to a generic progress message.
 595          */
 596         list_for_each_entry(&handler->progress, p, list) {
 597                 uint64_t c;
 598                 double t;
 599                 if (!p->percentage || !p->size) {
 600                         update = talloc_asprintf(handler,
 601                                         _("%u downloads in progress..."),
 602                                         handler->n_progress);
 603                         current = total = 0;
 604                         break;
 605                 }
 606
 607                 c = p->size;
 608                 t = (100 * c) / p->percentage;
 609
 610                 current += c;
 611                 total += t;
 612         }
 613
 614         if (total) {
 615                 current_converted = current;
 616                 while (current_converted >= 1000) {
 617                         current_converted >>= 10;
 618                         unit++;
 619                 }
 620                 update = talloc_asprintf(handler,
 621                                 _("%u %s downloading: %.0f%% - %lu%cB"),
 622                                 handler->n_progress,
 623                                 ngettext("item", "items", handler->n_progress),
 624                                 (current / total) * 100, current_converted,
 625                                 units[unit]);
 626         }
 627
 628         if (!update) {
 629                 pb_log("%s: failed to allocate new status\n", __func__);
 630         } else {
 631                 device_handler_status_info(handler, "%s\n", update);
 632                 talloc_free(update);
 633         }
 634 }
 635
 636 void device_handler_status_download_remove(struct device_handler *handler,
 637                 struct process_info *procinfo)
 638 {
 639         struct progress_info *p, *tmp;
 640
 641         list_for_each_entry_safe(&handler->progress, p, tmp, list)
 642                 if (p->procinfo == procinfo) {
 643                         list_remove(&p->list);
 644                         talloc_free(p);
 645                         handler->n_progress--;
 646                 }
 647 }
 648
 649 static void device_handler_boot_status_cb(void *arg, struct status *status)
 650 {
 651         device_handler_status(arg, status);
 652 }
 653
 654 static void countdown_status(struct device_handler *handler,
 655                 struct discover_boot_option *opt, unsigned int sec)
 656 {
 657         struct status status;
 658
 659         status.type = STATUS_INFO;
 660         status.message = talloc_asprintf(handler,
 661                         _("Booting in %d sec: [%s] %s"), sec,
 662                         opt->device->device->id, opt->option->name);
 663         status.backlog = false;
 664
 665         device_handler_status(handler, &status);
 666
 667         talloc_free(status.message);
 668 }
 669
 670 static int default_timeout(void *arg)
 671 {
 672         struct device_handler *handler = arg;
 673         struct discover_boot_option *opt;
 674
 675         if (!handler->default_boot_option)
 676                 return 0;
 677
 678         if (handler->pending_boot)
 679                 return 0;
 680
 681         opt = handler->default_boot_option;
 682
 683         if (handler->sec_to_boot) {
 684                 countdown_status(handler, opt, handler->sec_to_boot);
 685                 handler->sec_to_boot--;
 686                 handler->timeout_waiter = waiter_register_timeout(
 687                                                 handler->waitset, 1000,
 688                                                 default_timeout, handler);
 689                 return 0;
 690         }
 691
 692         handler->timeout_waiter = NULL;
 693
 694         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 695
 696         platform_pre_boot();
 697
 698         handler->pending_boot = boot(handler, handler->default_boot_option,
 699                         NULL, handler->dry_run, device_handler_boot_status_cb,
 700                         handler);
 701         handler->pending_boot_is_default = true;
 702         return 0;
 703 }
 704
 705 struct {
 706         enum ipmi_bootdev       ipmi_type;
 707         enum device_type        device_type;
 708 } device_type_map[] = {
 709         { IPMI_BOOTDEV_NETWORK, DEVICE_TYPE_NETWORK },
 710         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_DISK },
 711         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_USB },
 712         { IPMI_BOOTDEV_CDROM, DEVICE_TYPE_OPTICAL },
 713 };
 714
 715 static bool ipmi_device_type_matches(enum ipmi_bootdev ipmi_type,
 716                 enum device_type device_type)
 717 {
 718         unsigned int i;
 719
 720         for (i = 0; i < ARRAY_SIZE(device_type_map); i++) {
 721                 if (device_type_map[i].device_type == device_type)
 722                         return device_type_map[i].ipmi_type == ipmi_type;
 723         }
 724
 725         return false;
 726 }
 727
 728 static int autoboot_option_priority(const struct config *config,
 729                                 struct discover_boot_option *opt)
 730 {
 731         enum device_type type = opt->device->device->type;
 732         const char *uuid = opt->device->uuid;
 733         struct autoboot_option *auto_opt;
 734         unsigned int i;
 735
 736         for (i = 0; i < config->n_autoboot_opts; i++) {
 737                 auto_opt = &config->autoboot_opts[i];
 738                 if (auto_opt->boot_type == BOOT_DEVICE_UUID)
 739                         if (!strcmp(auto_opt->uuid, uuid))
 740                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 741
 742                 if (auto_opt->boot_type == BOOT_DEVICE_TYPE)
 743                         if (auto_opt->type == type ||
 744                             auto_opt->type == DEVICE_TYPE_ANY)
 745                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 746         }
 747
 748         return -1;
 749 }
 750
 751 /*
 752  * We have different priorities to resolve conflicts between boot options that
 753  * report to be the default for their device. This function assigns a priority
 754  * for these options.
 755  */
 756 static enum default_priority default_option_priority(
 757                 struct discover_boot_option *opt)
 758 {
 759         const struct config *config;
 760
 761         config = config_get();
 762
 763         /* We give highest priority to IPMI-configured boot options. If
 764          * we have an IPMI bootdev configuration set, then we don't allow
 765          * any other defaults */
 766         if (config->ipmi_bootdev) {
 767                 bool ipmi_match = ipmi_device_type_matches(config->ipmi_bootdev,
 768                                 opt->device->device->type);
 769                 if (ipmi_match)
 770                         return DEFAULT_PRIORITY_REMOTE;
 771
 772                 pb_debug("handler: disabled default priority due to "
 773                                 "non-matching IPMI type %x\n",
 774                                 config->ipmi_bootdev);
 775                 return DEFAULT_PRIORITY_DISABLED;
 776         }
 777
 778         /* Next, try to match the option against the user-defined autoboot
 779          * options, either by device UUID or type. */
 780         if (config->n_autoboot_opts) {
 781                 int boot_match = autoboot_option_priority(config, opt);
 782                 if (boot_match > 0)
 783                         return boot_match;
 784         }
 785
 786         /* If the option didn't match any entry in the array, it is disabled */
 787         pb_debug("handler: disabled default priority due to "
 788                         "non-matching UUID or type\n");
 789         return DEFAULT_PRIORITY_DISABLED;
 790 }
 791
 792 static void set_default(struct device_handler *handler,
 793                 struct discover_boot_option *opt)
 794 {
 795         enum default_priority cur_prio, new_prio;
 796
 797         if (!handler->autoboot_enabled)
 798                 return;
 799
 800         pb_debug("handler: new default option: %s\n", opt->option->id);
 801
 802         new_prio = default_option_priority(opt);
 803
 804         /* Anything outside our range prevents a default boot */
 805         if (new_prio >= DEFAULT_PRIORITY_DISABLED)
 806                 return;
 807
 808         pb_debug("handler: calculated priority %d\n", new_prio);
 809
 810         /* Resolve any conflicts: if we have a new default option, it only
 811          * replaces the current if it has a higher priority. */
 812         if (handler->default_boot_option) {
 813
 814                 cur_prio = handler->default_boot_option_priority;
 815
 816                 if (new_prio < cur_prio) {
 817                         pb_log("handler: new prio %d beats "
 818                                         "old prio %d for %s\n",
 819                                         new_prio, cur_prio,
 820                                         handler->default_boot_option
 821                                                 ->option->id);
 822                         handler->default_boot_option = opt;
 823                         handler->default_boot_option_priority = new_prio;
 824                         /* extend the timeout a little, so the user sees some
 825                          * indication of the change */
 826                         handler->sec_to_boot += 2;
 827                 }
 828
 829                 return;
 830         }
 831
 832         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 833         handler->default_boot_option = opt;
 834         handler->default_boot_option_priority = new_prio;
 835
 836         pb_log("handler: boot option %s set as default, timeout %u sec.\n",
 837                opt->option->id, handler->sec_to_boot);
 838
 839         default_timeout(handler);
 840 }
 841
 842 static bool resource_is_resolved(struct resource *res)
 843 {
 844         return !res || res->resolved;
 845 }
 846
 847 /* We only use this in an assert, which will disappear if we're compiling
 848  * with NDEBUG, so we need the 'used' attribute for these builds */
 849 static bool __attribute__((used)) boot_option_is_resolved(
 850                 struct discover_boot_option *opt)
 851 {
 852         return resource_is_resolved(opt->boot_image) &&
 853                 resource_is_resolved(opt->initrd) &&
 854                 resource_is_resolved(opt->dtb) &&
 855                 resource_is_resolved(opt->args_sig_file) &&
 856                 resource_is_resolved(opt->icon);
 857 }
 858
 859 static bool resource_resolve(struct resource *res, const char *name,
 860                 struct discover_boot_option *opt,
 861                 struct device_handler *handler)
 862 {
 863         struct parser *parser = opt->source;
 864
 865         if (resource_is_resolved(res))
 866                 return true;
 867
 868         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
 869                         opt->option->id, name, parser->name);
 870         parser->resolve_resource(handler, res);
 871
 872         return res->resolved;
 873 }
 874
 875 static bool boot_option_resolve(struct discover_boot_option *opt,
 876                 struct device_handler *handler)
 877 {
 878         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 879                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 880                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 881                 resource_resolve(opt->args_sig_file, "args_sig_file", opt,
 882                         handler) &&
 883                 resource_resolve(opt->icon, "icon", opt, handler);
 884 }
 885
 886 static void boot_option_finalise(struct device_handler *handler,
 887                 struct discover_boot_option *opt)
 888 {
 889         assert(boot_option_is_resolved(opt));
 890
 891         /* check that the parsers haven't set any of the final data */
 892         assert(!opt->option->boot_image_file);
 893         assert(!opt->option->initrd_file);
 894         assert(!opt->option->dtb_file);
 895         assert(!opt->option->icon_file);
 896         assert(!opt->option->device_id);
 897         assert(!opt->option->args_sig_file);
 898
 899         if (opt->boot_image)
 900                 opt->option->boot_image_file = opt->boot_image->url->full;
 901         if (opt->initrd)
 902                 opt->option->initrd_file = opt->initrd->url->full;
 903         if (opt->dtb)
 904                 opt->option->dtb_file = opt->dtb->url->full;
 905         if (opt->icon)
 906                 opt->option->icon_file = opt->icon->url->full;
 907         if (opt->args_sig_file)
 908                 opt->option->args_sig_file = opt->args_sig_file->url->full;
 909
 910         opt->option->device_id = opt->device->device->id;
 911
 912         if (opt->option->is_default)
 913                 set_default(handler, opt);
 914 }
 915
 916 static void notify_boot_option(struct device_handler *handler,
 917                 struct discover_boot_option *opt)
 918 {
 919         struct discover_device *dev = opt->device;
 920
 921         if (!dev->notified)
 922                 discover_server_notify_device_add(handler->server,
 923                                                   opt->device->device);
 924         dev->notified = true;
 925         discover_server_notify_boot_option_add(handler->server, opt->option);
 926 }
 927
 928 static void process_boot_option_queue(struct device_handler *handler)
 929 {
 930         struct discover_boot_option *opt, *tmp;
 931
 932         list_for_each_entry_safe(&handler->unresolved_boot_options,
 933                         opt, tmp, list) {
 934
 935                 pb_debug("queue: attempting resolution for %s\n",
 936                                 opt->option->id);
 937
 938                 if (!boot_option_resolve(opt, handler))
 939                         continue;
 940
 941                 pb_debug("\tresolved!\n");
 942
 943                 list_remove(&opt->list);
 944                 list_add_tail(&opt->device->boot_options, &opt->list);
 945                 talloc_steal(opt->device, opt);
 946                 boot_option_finalise(handler, opt);
 947                 notify_boot_option(handler, opt);
 948         }
 949 }
 950
 951 struct discover_context *device_handler_discover_context_create(
 952                 struct device_handler *handler,
 953                 struct discover_device *device)
 954 {
 955         struct discover_context *ctx;
 956
 957         ctx = talloc_zero(handler, struct discover_context);
 958         ctx->handler = handler;
 959         ctx->device = device;
 960         list_init(&ctx->boot_options);
 961
 962         return ctx;
 963 }
 964
 965 void device_handler_add_device(struct device_handler *handler,
 966                 struct discover_device *device)
 967 {
 968         handler->n_devices++;
 969         handler->devices = talloc_realloc(handler, handler->devices,
 970                                 struct discover_device *, handler->n_devices);
 971         handler->devices[handler->n_devices - 1] = device;
 972
 973         if (device->device->type == DEVICE_TYPE_NETWORK)
 974                 network_register_device(handler->network, device);
 975 }
 976
 977 void device_handler_add_ramdisk(struct device_handler *handler,
 978                 const char *path)
 979 {
 980         struct ramdisk_device *dev;
 981         unsigned int i;
 982
 983         if (!path)
 984                 return;
 985
 986         for (i = 0; i < handler->n_ramdisks; i++)
 987                 if (!strcmp(handler->ramdisks[i]->path, path))
 988                         return;
 989
 990         dev = talloc_zero(handler, struct ramdisk_device);
 991         if (!dev) {
 992                 pb_log("Failed to allocate memory to track %s\n", path);
 993                 return;
 994         }
 995
 996         dev->path = talloc_strdup(handler, path);
 997
 998         handler->ramdisks = talloc_realloc(handler, handler->ramdisks,
 999                                 struct ramdisk_device *,
1000                                 handler->n_ramdisks + 1);
1001         if (!handler->ramdisks) {
1002                 pb_log("Failed to reallocate memory"
1003                        "- ramdisk tracking inconsistent!\n");
1004                 return;
1005         }
1006
1007         handler->ramdisks[i] = dev;
1008         i = handler->n_ramdisks++;
1009 }
1010
1011 struct ramdisk_device *device_handler_get_ramdisk(
1012                 struct device_handler *handler)
1013 {
1014         unsigned int i;
1015         char *name;
1016         dev_t id;
1017
1018         /* Check if free ramdisk exists */
1019         for (i = 0; i < handler->n_ramdisks; i++)
1020                 if (!handler->ramdisks[i]->snapshot &&
1021                     !handler->ramdisks[i]->origin &&
1022                     !handler->ramdisks[i]->base)
1023                         return handler->ramdisks[i];
1024
1025         /* Otherwise create a new one */
1026         name = talloc_asprintf(handler, "/dev/ram%d",
1027                         handler->n_ramdisks);
1028         if (!name) {
1029                 pb_debug("Failed to allocate memory to name /dev/ram%d",
1030                         handler->n_ramdisks);
1031                 return NULL;
1032         }
1033
1034         id = makedev(1, handler->n_ramdisks);
1035         if (mknod(name, S_IFBLK, id)) {
1036                 if (errno == EEXIST) {
1037                         /* We haven't yet received updates for existing
1038                          * ramdisks - add and use this one */
1039                         pb_debug("Using untracked ramdisk %s\n", name);
1040                 } else {
1041                         pb_log("Failed to create new ramdisk %s: %s\n",
1042                                name, strerror(errno));
1043                         return NULL;
1044                 }
1045         }
1046         device_handler_add_ramdisk(handler, name);
1047         talloc_free(name);
1048
1049         return handler->ramdisks[i];
1050 }
1051
1052 void device_handler_release_ramdisk(struct discover_device *device)
1053 {
1054         struct ramdisk_device *ramdisk = device->ramdisk;
1055
1056         talloc_free(ramdisk->snapshot);
1057         talloc_free(ramdisk->origin);
1058         talloc_free(ramdisk->base);
1059
1060         ramdisk->snapshot = ramdisk->origin = ramdisk->base = NULL;
1061         ramdisk->sectors = 0;
1062
1063         device->ramdisk = NULL;
1064 }
1065
1066 /* Start discovery on a hotplugged device. The device will be in our devices
1067  * array, but has only just been initialised by the hotplug source.
1068  */
1069 int device_handler_discover(struct device_handler *handler,
1070                 struct discover_device *dev)
1071 {
1072         struct discover_context *ctx;
1073         int rc;
1074
1075         device_handler_status_dev_info(handler, dev,
1076                 /*
1077                  * TRANSLATORS: this string will be passed the type of the
1078                  * device (eg "disk" or "network"), which will be translated
1079                  * accordingly.
1080                  */
1081                 _("Processing new %s device"),
1082                 device_type_display_name(dev->device->type));
1083
1084         /* create our context */
1085         ctx = device_handler_discover_context_create(handler, dev);
1086
1087         rc = mount_device(dev);
1088         if (rc)
1089                 goto out;
1090
1091         /* add this device to our system info */
1092         system_info_register_blockdev(dev->device->id, dev->uuid,
1093                         dev->mount_path);
1094
1095         /* run the parsers. This will populate the ctx's boot_option list. */
1096         iterate_parsers(ctx);
1097
1098         /* add discovered stuff to the handler */
1099         device_handler_discover_context_commit(handler, ctx);
1100
1101         process_boot_option_queue(handler);
1102 out:
1103         talloc_unlink(handler, ctx);
1104
1105         return 0;
1106 }
1107
1108 /* Incoming dhcp event */
1109 int device_handler_dhcp(struct device_handler *handler,
1110                 struct discover_device *dev, struct event *event)
1111 {
1112         struct discover_context *ctx;
1113
1114         device_handler_status_dev_info(handler, dev,
1115                         _("Processing DHCP lease response (ip: %s)"),
1116                         event_get_param(event, "ip"));
1117
1118         pending_network_jobs_start();
1119
1120         /* create our context */
1121         ctx = device_handler_discover_context_create(handler, dev);
1122         talloc_steal(ctx, event);
1123         ctx->event = event;
1124
1125         iterate_parsers(ctx);
1126
1127         device_handler_discover_context_commit(handler, ctx);
1128
1129         talloc_unlink(handler, ctx);
1130
1131         return 0;
1132 }
1133
1134 static struct discover_boot_option *find_boot_option_by_id(
1135                 struct device_handler *handler, const char *id)
1136 {
1137         unsigned int i;
1138
1139         for (i = 0; i < handler->n_devices; i++) {
1140                 struct discover_device *dev = handler->devices[i];
1141                 struct discover_boot_option *opt;
1142
1143                 list_for_each_entry(&dev->boot_options, opt, list)
1144                         if (!strcmp(opt->option->id, id))
1145                                 return opt;
1146         }
1147
1148         return NULL;
1149 }
1150
1151 void device_handler_boot(struct device_handler *handler,
1152                 struct boot_command *cmd)
1153 {
1154         struct discover_boot_option *opt = NULL;
1155
1156         if (cmd->option_id && strlen(cmd->option_id))
1157                 opt = find_boot_option_by_id(handler, cmd->option_id);
1158
1159         if (handler->pending_boot)
1160                 boot_cancel(handler->pending_boot);
1161
1162         platform_pre_boot();
1163
1164         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
1165                         device_handler_boot_status_cb, handler);
1166         handler->pending_boot_is_default = false;
1167 }
1168
1169 void device_handler_cancel_default(struct device_handler *handler)
1170 {
1171         if (handler->timeout_waiter)
1172                 waiter_remove(handler->timeout_waiter);
1173
1174         handler->timeout_waiter = NULL;
1175         handler->autoboot_enabled = false;
1176
1177         /* we only send status if we had a default boot option queued */
1178         if (!handler->default_boot_option)
1179                 return;
1180
1181         pb_log("Cancelling default boot option\n");
1182
1183         if (handler->pending_boot && handler->pending_boot_is_default) {
1184                 boot_cancel(handler->pending_boot);
1185                 handler->pending_boot = NULL;
1186                 handler->pending_boot_is_default = false;
1187         }
1188
1189         handler->default_boot_option = NULL;
1190
1191         device_handler_status_info(handler, _("Default boot cancelled"));
1192 }
1193
1194 void device_handler_update_config(struct device_handler *handler,
1195                 struct config *config)
1196 {
1197         int rc;
1198
1199         rc = config_set(config);
1200         if (rc)
1201                 return;
1202
1203         discover_server_notify_config(handler->server, config);
1204         device_handler_update_lang(config->lang);
1205         device_handler_reinit(handler);
1206 }
1207
1208 static char *device_from_addr(void *ctx, struct pb_url *url)
1209 {
1210         char *ipaddr, *buf, *tok, *dev = NULL;
1211         const char *delim = " ";
1212         struct sockaddr_in *ip;
1213         struct sockaddr_in si;
1214         struct addrinfo *res;
1215         struct process *p;
1216         int rc;
1217
1218         /* Note: IPv4 only */
1219         rc = inet_pton(AF_INET, url->host, &(si.sin_addr));
1220         if (rc > 0) {
1221                 ipaddr = url->host;
1222         } else {
1223                 /* need to turn hostname into a valid IP */
1224                 rc = getaddrinfo(url->host, NULL, NULL, &res);
1225                 if (rc) {
1226                         pb_debug("%s: Invalid URL\n",__func__);
1227                         return NULL;
1228                 }
1229                 ipaddr = talloc_array(ctx,char,INET_ADDRSTRLEN);
1230                 ip = (struct sockaddr_in *) res->ai_addr;
1231                 inet_ntop(AF_INET, &(ip->sin_addr), ipaddr, INET_ADDRSTRLEN);
1232                 freeaddrinfo(res);
1233         }
1234
1235         const char *argv[] = {
1236                 pb_system_apps.ip,
1237                 "route", "show", "to", "match",
1238                 ipaddr,
1239                 NULL
1240         };
1241
1242         p = process_create(ctx);
1243
1244         p->path = pb_system_apps.ip;
1245         p->argv = argv;
1246         p->keep_stdout = true;
1247
1248         rc = process_run_sync(p);
1249
1250         if (rc || p->exit_status) {
1251                 /* ip has complained for some reason; most likely
1252                  * there is no route to the host - bail out */
1253                 pb_debug("%s: `ip` returns non-zero exit status\n", __func__);
1254                 pb_debug("ip buf: %s\n", p->stdout_buf);
1255                 process_release(p);
1256                 return NULL;
1257         }
1258
1259         buf = p->stdout_buf;
1260         /* If a route is found, ip-route output will be of the form
1261          * "... dev DEVNAME ... " */
1262         tok = strtok(buf, delim);
1263         while (tok) {
1264                 if (!strcmp(tok, "dev")) {
1265                         tok = strtok(NULL, delim);
1266                         dev = talloc_strdup(ctx, tok);
1267                         break;
1268                 }
1269                 tok = strtok(NULL, delim);
1270         }
1271
1272         process_release(p);
1273         if (dev)
1274                 pb_debug("%s: Found interface '%s'\n", __func__,dev);
1275         return dev;
1276 }
1277
1278 static void process_url_cb(struct load_url_result *result, void *data)
1279 {
1280         struct device_handler *handler;
1281         struct discover_context *ctx;
1282         struct discover_device *dev;
1283         struct event *event = data;
1284         const char *mac;
1285
1286         if (result->status != LOAD_OK) {
1287                 pb_log("%s: Load failed for %s\n", __func__, result->url->full);
1288                 return;
1289         }
1290
1291         if (!event)
1292                 return;
1293
1294         handler = talloc_parent(event);
1295         if (!handler)
1296                 return;
1297
1298         event->device = device_from_addr(event, result->url);
1299         if (!event->device) {
1300                 pb_log("Downloaded a file but can't find its interface - pretending it was local\n");
1301                 event->device = talloc_asprintf(event, "local");
1302         }
1303
1304         mac = event_get_param(event, "mac");
1305         char *url = talloc_asprintf(event, "file://%s", result->local);
1306         event_set_param(event, "pxeconffile", url);
1307
1308         dev = discover_device_create(handler, mac, event->device);
1309         ctx = device_handler_discover_context_create(handler, dev);
1310         talloc_steal(ctx, event);
1311         ctx->event = event;
1312
1313         iterate_parsers(ctx);
1314
1315         device_handler_discover_context_commit(handler, ctx);
1316
1317         talloc_unlink(handler, ctx);
1318 }
1319
1320 void device_handler_process_url(struct device_handler *handler,
1321                 const char *url, const char *mac, const char *ip)
1322 {
1323         struct discover_context *ctx;
1324         struct discover_device *dev;
1325         bool allow_async = false;
1326         struct pb_url *pb_url;
1327         struct event *event;
1328
1329         event = talloc_zero(handler, struct event);
1330         event->type = EVENT_TYPE_USER;
1331         event->action = EVENT_ACTION_URL;
1332
1333         pb_url = pb_url_parse(event, url);
1334         if (!pb_url || (pb_url->scheme != pb_url_file && !pb_url->host)) {
1335                 device_handler_status_err(handler, _("Invalid config URL!"));
1336                 talloc_free(event);
1337                 return;
1338         }
1339
1340         if (url[strlen(url) - 1] == '/') {
1341                 event_set_param(event, "pxepathprefix", url);
1342                 event_set_param(event, "mac", mac);
1343                 event_set_param(event, "ip", ip);
1344                 event->device = device_from_addr(event, pb_url);
1345                 if (!event->device) {
1346                         device_handler_status_err(handler,
1347                                         _("Unable to route to host %s"),
1348                                         pb_url->host);
1349                         talloc_free(event);
1350                         return;
1351                 }
1352         } else {
1353                 event_set_param(event, "pxeconffile", url);
1354                 allow_async = true;
1355         }
1356
1357         if (pb_url->scheme == pb_url_file)
1358                 event->device = talloc_asprintf(event, "local");
1359         else if (allow_async) {
1360                 /* If file is remote load asynchronously before passing to
1361                  * parser. This allows us to wait for network to be available */
1362                 if (!load_url_async(handler, pb_url, process_url_cb, event,
1363                                         NULL, handler)) {
1364                         pb_log("Failed to load url %s\n", pb_url->full);
1365                         device_handler_status_err(handler, _("Failed to load URL!"));
1366                         talloc_free(event);
1367                 }
1368                 return;
1369         }
1370
1371         /* If path is local we can parse straight away */
1372
1373         dev = discover_device_create(handler, mac, event->device);
1374         if (pb_url->scheme == pb_url_file)
1375                 dev->device->type = DEVICE_TYPE_ANY;
1376         ctx = device_handler_discover_context_create(handler, dev);
1377         talloc_steal(ctx, event);
1378         ctx->event = event;
1379
1380         iterate_parsers(ctx);
1381
1382         device_handler_discover_context_commit(handler, ctx);
1383
1384         talloc_unlink(handler, ctx);
1385 }
1386
1387 #ifndef PETITBOOT_TEST
1388
1389 /**
1390  * context_commit - Commit a temporary discovery context to the handler,
1391  * and notify the clients about any new options / devices
1392  */
1393 void device_handler_discover_context_commit(struct device_handler *handler,
1394                 struct discover_context *ctx)
1395 {
1396         struct discover_device *dev = ctx->device;
1397         struct discover_boot_option *opt, *tmp;
1398
1399         if (!device_lookup_by_uuid(handler, dev->uuid))
1400                 device_handler_add_device(handler, dev);
1401
1402         /* move boot options from the context to the device */
1403         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
1404                 list_remove(&opt->list);
1405
1406                 /* All boot options need at least a kernel image */
1407                 if (!opt->boot_image || !opt->boot_image->url) {
1408                         pb_log("boot option %s is missing boot image, ignoring\n",
1409                                 opt->option->id);
1410                         talloc_free(opt);
1411                         continue;
1412                 }
1413
1414                 if (boot_option_resolve(opt, handler)) {
1415                         pb_log("boot option %s is resolved, "
1416                                         "sending to clients\n",
1417                                         opt->option->id);
1418                         list_add_tail(&dev->boot_options, &opt->list);
1419                         talloc_steal(dev, opt);
1420                         boot_option_finalise(handler, opt);
1421                         notify_boot_option(handler, opt);
1422                 } else {
1423                         if (!opt->source->resolve_resource) {
1424                                 pb_log("parser %s gave us an unresolved "
1425                                         "resource (%s), but no way to "
1426                                         "resolve it\n",
1427                                         opt->source->name, opt->option->id);
1428                                 talloc_free(opt);
1429                         } else {
1430                                 pb_log("boot option %s is unresolved, "
1431                                                 "adding to queue\n",
1432                                                 opt->option->id);
1433                                 list_add(&handler->unresolved_boot_options,
1434                                                 &opt->list);
1435                                 talloc_steal(handler, opt);
1436                         }
1437                 }
1438         }
1439 }
1440
1441 static void device_handler_update_lang(const char *lang)
1442 {
1443         const char *cur_lang;
1444
1445         if (!lang)
1446                 return;
1447
1448         cur_lang = setlocale(LC_ALL, NULL);
1449         if (cur_lang && !strcmp(cur_lang, lang))
1450                 return;
1451
1452         setlocale(LC_ALL, lang);
1453 }
1454
1455 static int device_handler_init_sources(struct device_handler *handler)
1456 {
1457         /* init our device sources: udev, network and user events */
1458         handler->network = network_init(handler, handler->waitset,
1459                         handler->dry_run);
1460         if (!handler->network)
1461                 return -1;
1462
1463         handler->udev = udev_init(handler, handler->waitset);
1464         if (!handler->udev)
1465                 return -1;
1466
1467         handler->user_event = user_event_init(handler, handler->waitset);
1468         if (!handler->user_event)
1469                 return -1;
1470
1471         return 0;
1472 }
1473
1474 static void device_handler_reinit_sources(struct device_handler *handler)
1475 {
1476         /* if we haven't initialised sources previously (becuase we started in
1477          * safe mode), then init once here. */
1478         if (!(handler->udev || handler->network || handler->user_event)) {
1479                 device_handler_init_sources(handler);
1480                 return;
1481         }
1482
1483         system_info_reinit();
1484
1485         network_shutdown(handler->network);
1486         handler->network = network_init(handler, handler->waitset,
1487                         handler->dry_run);
1488
1489         udev_reinit(handler->udev);
1490 }
1491
1492 static inline const char *get_device_path(struct discover_device *dev)
1493 {
1494         return dev->ramdisk ? dev->ramdisk->snapshot : dev->device_path;
1495 }
1496
1497 static char *check_subvols(struct discover_device *dev)
1498 {
1499         const char *fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1500         struct stat sb;
1501         char *path;
1502         int rc;
1503
1504         if (strncmp(fstype, "btrfs", strlen("btrfs")))
1505                 return dev->mount_path;
1506
1507         /* On btrfs a device's root may be under a subvolume path */
1508         path = join_paths(dev, dev->mount_path, "@");
1509         rc = stat(path, &sb);
1510         if (!rc && S_ISDIR(sb.st_mode)) {
1511                 pb_debug("Using '%s' for btrfs root path\n", path);
1512                 return path;
1513         }
1514
1515         talloc_free(path);
1516         return dev->mount_path;
1517 }
1518
1519 static bool check_existing_mount(struct discover_device *dev)
1520 {
1521         struct stat devstat, mntstat;
1522         const char *device_path;
1523         struct mntent *mnt;
1524         FILE *fp;
1525         int rc;
1526
1527         device_path = get_device_path(dev);
1528
1529         rc = stat(device_path, &devstat);
1530         if (rc) {
1531                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
1532                 return false;
1533         }
1534
1535         if (!S_ISBLK(devstat.st_mode)) {
1536                 pb_debug("%s: %s isn't a block device?\n", __func__,
1537                                 dev->device_path);
1538                 return false;
1539         }
1540
1541         fp = fopen("/proc/self/mounts", "r");
1542
1543         for (;;) {
1544                 mnt = getmntent(fp);
1545                 if (!mnt)
1546                         break;
1547
1548                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
1549                         continue;
1550
1551                 rc = stat(mnt->mnt_fsname, &mntstat);
1552                 if (rc)
1553                         continue;
1554
1555                 if (!S_ISBLK(mntstat.st_mode))
1556                         continue;
1557
1558                 if (mntstat.st_rdev == devstat.st_rdev) {
1559                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
1560                         dev->root_path = check_subvols(dev);
1561                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
1562                         dev->mounted = true;
1563                         dev->unmount = false;
1564
1565                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
1566                                         __func__, dev->device_path,
1567                                         dev->mounted_rw ? 'w' : 'o',
1568                                         mnt->mnt_dir);
1569                         break;
1570                 }
1571         }
1572
1573         fclose(fp);
1574
1575         return mnt != NULL;
1576 }
1577
1578 /*
1579  * Attempt to mount a filesystem safely, while handling certain filesytem-
1580  * specific options
1581  */
1582 static int try_mount(const char *device_path, const char *mount_path,
1583                              const char *fstype, unsigned long flags,
1584                              bool have_snapshot)
1585 {
1586         const char *fs, *safe_opts;
1587         int rc;
1588
1589         /* Mount ext3 as ext4 instead so 'norecovery' can be used */
1590         if (strncmp(fstype, "ext3", strlen("ext3")) == 0) {
1591                 pb_debug("Mounting ext3 filesystem as ext4\n");
1592                 fs = "ext4";
1593         } else
1594                 fs = fstype;
1595
1596         if (strncmp(fs, "xfs", strlen("xfs")) == 0 ||
1597             strncmp(fs, "ext4", strlen("ext4")) == 0)
1598                 safe_opts = "norecovery";
1599         else
1600                 safe_opts = NULL;
1601
1602         errno = 0;
1603         /* If no snapshot is available don't attempt recovery */
1604         if (!have_snapshot)
1605                 return mount(device_path, mount_path, fs, flags, safe_opts);
1606
1607         rc = mount(device_path, mount_path, fs, flags, NULL);
1608
1609         if (!rc)
1610                 return rc;
1611
1612         /* Mounting failed; some filesystems will fail to mount if a recovery
1613          * journal exists (eg. cross-endian XFS), so try again with norecovery
1614          * where that option is available.
1615          * If mounting read-write just return the error as norecovery is not a
1616          * valid option */
1617         if ((flags & MS_RDONLY) != MS_RDONLY || !safe_opts)
1618                 return rc;
1619
1620         errno = 0;
1621         return mount(device_path, mount_path, fs, flags, safe_opts);
1622 }
1623
1624 static int mount_device(struct discover_device *dev)
1625 {
1626         const char *fstype, *device_path;
1627         int rc;
1628
1629         if (!dev->device_path)
1630                 return -1;
1631
1632         if (dev->mounted)
1633                 return 0;
1634
1635         if (check_existing_mount(dev))
1636                 return 0;
1637
1638         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1639         if (!fstype)
1640                 return 0;
1641
1642         dev->mount_path = join_paths(dev, mount_base(),
1643                                         dev->device_path);
1644
1645         if (pb_mkdir_recursive(dev->mount_path)) {
1646                 pb_log("couldn't create mount directory %s: %s\n",
1647                                 dev->mount_path, strerror(errno));
1648                 goto err_free;
1649         }
1650
1651         device_path = get_device_path(dev);
1652
1653         pb_log("mounting device %s read-only\n", dev->device_path);
1654         rc = try_mount(device_path, dev->mount_path, fstype,
1655                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1656
1657         if (!rc) {
1658                 dev->mounted = true;
1659                 dev->mounted_rw = false;
1660                 dev->unmount = true;
1661                 dev->root_path = check_subvols(dev);
1662                 return 0;
1663         }
1664
1665         pb_log("couldn't mount device %s: mount failed: %s\n",
1666                         device_path, strerror(errno));
1667
1668         /* If mount fails clean up any snapshot */
1669         devmapper_destroy_snapshot(dev);
1670
1671         pb_rmdir_recursive(mount_base(), dev->mount_path);
1672 err_free:
1673         talloc_free(dev->mount_path);
1674         dev->mount_path = NULL;
1675         return -1;
1676 }
1677
1678 static int umount_device(struct discover_device *dev)
1679 {
1680         const char *device_path;
1681         int rc;
1682
1683         if (!dev->mounted || !dev->unmount)
1684                 return 0;
1685
1686         device_path = get_device_path(dev);
1687
1688         pb_log("unmounting device %s\n", device_path);
1689         rc = umount(dev->mount_path);
1690         if (rc)
1691                 return -1;
1692
1693         dev->mounted = false;
1694         devmapper_destroy_snapshot(dev);
1695
1696         pb_rmdir_recursive(mount_base(), dev->mount_path);
1697
1698         talloc_free(dev->mount_path);
1699         dev->mount_path = NULL;
1700         dev->root_path = NULL;
1701
1702         return 0;
1703 }
1704
1705 int device_request_write(struct discover_device *dev, bool *release)
1706 {
1707         const char *fstype, *device_path;
1708         const struct config *config;
1709         int rc;
1710
1711         *release = false;
1712
1713         config = config_get();
1714         if (!config->allow_writes)
1715                 return -1;
1716
1717         if (!dev->mounted)
1718                 return -1;
1719
1720         if (dev->mounted_rw)
1721                 return 0;
1722
1723         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1724
1725         device_path = get_device_path(dev);
1726
1727         pb_log("remounting device %s read-write\n", device_path);
1728
1729         rc = umount(dev->mount_path);
1730         if (rc) {
1731                 pb_log("Failed to unmount %s: %s\n",
1732                        dev->mount_path, strerror(errno));
1733                 return -1;
1734         }
1735
1736         rc = try_mount(device_path, dev->mount_path, fstype,
1737                        MS_SILENT, dev->ramdisk);
1738         if (rc)
1739                 goto mount_ro;
1740
1741         dev->mounted_rw = true;
1742         *release = true;
1743         return 0;
1744
1745 mount_ro:
1746         pb_log("Unable to remount device %s read-write: %s\n",
1747                device_path, strerror(errno));
1748         rc = try_mount(device_path, dev->mount_path, fstype,
1749                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1750         if (rc)
1751                 pb_log("Unable to recover mount for %s: %s\n",
1752                        device_path, strerror(errno));
1753         return -1;
1754 }
1755
1756 void device_release_write(struct discover_device *dev, bool release)
1757 {
1758         const char *fstype, *device_path;
1759
1760         if (!release)
1761                 return;
1762
1763         device_path = get_device_path(dev);
1764
1765         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1766
1767         pb_log("remounting device %s read-only\n", device_path);
1768
1769         if (umount(dev->mount_path)) {
1770                 pb_log("Failed to unmount %s\n", dev->mount_path);
1771                 return;
1772         }
1773         dev->mounted_rw = dev->mounted = false;
1774
1775         if (dev->ramdisk) {
1776                 devmapper_merge_snapshot(dev);
1777                 /* device_path becomes stale after merge */
1778                 device_path = get_device_path(dev);
1779         }
1780
1781         if (try_mount(device_path, dev->mount_path, fstype,
1782                        MS_RDONLY | MS_SILENT, dev->ramdisk))
1783                 pb_log("Failed to remount %s read-only: %s\n",
1784                        device_path, strerror(errno));
1785         else
1786                 dev->mounted = true;
1787 }
1788
1789 void device_sync_snapshots(struct device_handler *handler, const char *device)
1790 {
1791         struct discover_device *dev = NULL;
1792         unsigned int i;
1793
1794         if (device) {
1795                 /* Find matching device and sync */
1796                 dev = device_lookup_by_name(handler, device);
1797                 if (!dev) {
1798                         pb_log("%s: device name '%s' unrecognised\n",
1799                                 __func__, device);
1800                         return;
1801                 }
1802                 if (dev->ramdisk)
1803                         device_release_write(dev, true);
1804                 else
1805                         pb_log("%s has no snapshot to merge, skipping\n",
1806                                 dev->device->id);
1807                 return;
1808         }
1809
1810         /* Otherwise sync all relevant devices */
1811         for (i = 0; i < handler->n_devices; i++) {
1812                 dev = handler->devices[i];
1813                 if (dev->device->type != DEVICE_TYPE_DISK &&
1814                         dev->device->type != DEVICE_TYPE_USB)
1815                         continue;
1816                 if (dev->ramdisk)
1817                         device_release_write(dev, true);
1818                 else
1819                         pb_log("%s has no snapshot to merge, skipping\n",
1820                                 dev->device->id);
1821         }
1822 }
1823
1824 #else
1825
1826 void device_handler_discover_context_commit(
1827                 struct device_handler *handler __attribute__((unused)),
1828                 struct discover_context *ctx __attribute__((unused)))
1829 {
1830         pb_log("%s stubbed out for test cases\n", __func__);
1831 }
1832
1833 static void device_handler_update_lang(const char *lang __attribute__((unused)))
1834 {
1835 }
1836
1837 static int device_handler_init_sources(
1838                 struct device_handler *handler __attribute__((unused)))
1839 {
1840         return 0;
1841 }
1842
1843 static void device_handler_reinit_sources(
1844                 struct device_handler *handler __attribute__((unused)))
1845 {
1846 }
1847
1848 static int umount_device(struct discover_device *dev __attribute__((unused)))
1849 {
1850         return 0;
1851 }
1852
1853 static int __attribute__((unused)) mount_device(
1854                 struct discover_device *dev __attribute__((unused)))
1855 {
1856         return 0;
1857 }
1858
1859 int device_request_write(struct discover_device *dev __attribute__((unused)),
1860                 bool *release)
1861 {
1862         *release = true;
1863         return 0;
1864 }
1865
1866 void device_release_write(struct discover_device *dev __attribute__((unused)),
1867         bool release __attribute__((unused)))
1868 {
1869 }
1870
1871 void device_sync_snapshots(
1872                 struct device_handler *handler __attribute__((unused)),
1873                 const char *device __attribute__((unused)))
1874 {
1875 }
1876
1877 #endif