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 struct device_handler *device_handler_init(struct discover_server *server,
 317                 struct waitset *waitset, int dry_run)
 318 {
 319         struct device_handler *handler;
 320         int rc;
 321
 322         handler = talloc_zero(NULL, struct device_handler);
 323         handler->server = server;
 324         handler->waitset = waitset;
 325         handler->dry_run = dry_run;
 326         handler->autoboot_enabled = config_autoboot_active(config_get());
 327
 328         list_init(&handler->unresolved_boot_options);
 329
 330         list_init(&handler->progress);
 331
 332         /* set up our mount point base */
 333         pb_mkdir_recursive(mount_base());
 334
 335         parser_init();
 336
 337         if (config_get()->safe_mode)
 338                 return handler;
 339
 340         rc = device_handler_init_sources(handler);
 341         if (rc) {
 342                 talloc_free(handler);
 343                 return NULL;
 344         }
 345
 346         return handler;
 347 }
 348
 349 void device_handler_reinit(struct device_handler *handler)
 350 {
 351         struct discover_boot_option *opt, *tmp;
 352         struct ramdisk_device *ramdisk;
 353         struct config *config;
 354         unsigned int i;
 355
 356         device_handler_cancel_default(handler);
 357         /* Cancel any pending non-default boot */
 358         if (handler->pending_boot) {
 359                 boot_cancel(handler->pending_boot);
 360                 handler->pending_boot = NULL;
 361                 handler->pending_boot_is_default = false;
 362         }
 363
 364         /* Cancel any remaining async jobs */
 365         process_stop_async_all();
 366
 367         /* free unresolved boot options */
 368         list_for_each_entry_safe(&handler->unresolved_boot_options,
 369                         opt, tmp, list)
 370                 talloc_free(opt);
 371         list_init(&handler->unresolved_boot_options);
 372
 373         /* drop all devices */
 374         for (i = 0; i < handler->n_devices; i++) {
 375                 discover_server_notify_device_remove(handler->server,
 376                                 handler->devices[i]->device);
 377                 ramdisk = handler->devices[i]->ramdisk;
 378                 talloc_free(handler->devices[i]);
 379                 talloc_free(ramdisk);
 380         }
 381
 382         talloc_free(handler->devices);
 383         handler->devices = NULL;
 384         handler->n_devices = 0;
 385         talloc_free(handler->ramdisks);
 386         handler->ramdisks = NULL;
 387         handler->n_ramdisks = 0;
 388
 389         /* If the safe mode warning was active disable it now */
 390         if (config_get()->safe_mode) {
 391                 config = config_copy(handler, config_get());
 392                 config->safe_mode = false;
 393                 config_set(config);
 394                 discover_server_notify_config(handler->server, config);
 395         }
 396
 397         device_handler_reinit_sources(handler);
 398 }
 399
 400 void device_handler_remove(struct device_handler *handler,
 401                 struct discover_device *device)
 402 {
 403         struct discover_boot_option *opt, *tmp;
 404         unsigned int i;
 405
 406         list_for_each_entry_safe(&device->boot_options, opt, tmp, list) {
 407                 if (opt == handler->default_boot_option) {
 408                         pb_log("Default option %s cancelled since device removed",
 409                                         opt->option->name);
 410                         device_handler_cancel_default(handler);
 411                         break;
 412                 }
 413         }
 414
 415         for (i = 0; i < handler->n_devices; i++)
 416                 if (handler->devices[i] == device)
 417                         break;
 418
 419         if (i == handler->n_devices) {
 420                 talloc_free(device);
 421                 return;
 422         }
 423
 424         /* Free any unresolved options, as they're currently allocated
 425          * against the handler */
 426         list_for_each_entry_safe(&handler->unresolved_boot_options,
 427                         opt, tmp, list) {
 428                 if (opt->device != device)
 429                         continue;
 430                 list_remove(&opt->list);
 431                 talloc_free(opt);
 432         }
 433
 434         /* if this is a network device, we have to unregister it from the
 435          * network code */
 436         if (device->device->type == DEVICE_TYPE_NETWORK)
 437                 network_unregister_device(handler->network, device);
 438
 439         handler->n_devices--;
 440         memmove(&handler->devices[i], &handler->devices[i + 1],
 441                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 442         handler->devices = talloc_realloc(handler, handler->devices,
 443                 struct discover_device *, handler->n_devices);
 444
 445         if (device->notified)
 446                 discover_server_notify_device_remove(handler->server,
 447                                                         device->device);
 448
 449         talloc_free(device);
 450 }
 451
 452 void device_handler_status(struct device_handler *handler,
 453                 struct status *status)
 454 {
 455         discover_server_notify_boot_status(handler->server, status);
 456 }
 457
 458 static void _device_handler_vstatus(struct device_handler *handler,
 459                 enum status_type type, const char *fmt, va_list ap)
 460 {
 461         struct status status;
 462
 463         status.type = type;
 464         status.message = talloc_vasprintf(handler, fmt, ap);
 465         status.backlog = false;
 466
 467         device_handler_status(handler, &status);
 468
 469         talloc_free(status.message);
 470 }
 471
 472 static void _device_handler_vdevstatus(struct device_handler *handler,
 473                 struct discover_device *device, enum status_type type,
 474                 const char *fmt, va_list ap)
 475 {
 476         char *msg;
 477
 478         msg = talloc_asprintf(handler, "[%s] %s",
 479                         device ? device->device->id : "unknown", fmt);
 480         _device_handler_vstatus(handler, type, msg, ap);
 481         talloc_free(msg);
 482 }
 483
 484 void device_handler_status_dev_info(struct device_handler *handler,
 485                 struct discover_device *dev, const char *fmt, ...)
 486 {
 487         va_list ap;
 488
 489         va_start(ap, fmt);
 490         _device_handler_vdevstatus(handler, dev, STATUS_INFO, fmt, ap);
 491         va_end(ap);
 492 }
 493
 494 void device_handler_status_dev_err(struct device_handler *handler,
 495                 struct discover_device *dev, const char *fmt, ...)
 496 {
 497         va_list ap;
 498
 499         va_start(ap, fmt);
 500         _device_handler_vdevstatus(handler, dev, STATUS_ERROR, fmt, ap);
 501         va_end(ap);
 502 }
 503
 504 void device_handler_status_info(struct device_handler *handler,
 505                 const char *fmt, ...)
 506 {
 507         va_list ap;
 508
 509         va_start(ap, fmt);
 510         _device_handler_vstatus(handler, STATUS_INFO, fmt, ap);
 511         va_end(ap);
 512 }
 513
 514 void device_handler_status_err(struct device_handler *handler,
 515                 const char *fmt, ...)
 516 {
 517         va_list ap;
 518
 519         va_start(ap, fmt);
 520         _device_handler_vstatus(handler, STATUS_ERROR, fmt, ap);
 521         va_end(ap);
 522 }
 523
 524 void device_handler_status_download(struct device_handler *handler,
 525                 const struct process_info *procinfo,
 526                 unsigned int percentage, unsigned int size, char suffix)
 527 {
 528         struct progress_info *p, *progress = NULL;
 529         uint64_t current_converted, current = 0;
 530         const char *units = " kMGTP";
 531         unsigned long size_bytes;
 532         char *update = NULL;
 533         double total = 0;
 534         unsigned int i;
 535         int unit = 0;
 536
 537         list_for_each_entry(&handler->progress, p, list)
 538                 if (p->procinfo == procinfo)
 539                         progress = p;
 540
 541         if (!progress) {
 542                 pb_log("Registering new progress struct\n");
 543                 progress = talloc_zero(handler, struct progress_info);
 544                 if (!progress) {
 545                         pb_log("Failed to allocate room for progress struct\n");
 546                         return;
 547                 }
 548                 progress->procinfo = procinfo;
 549                 list_add(&handler->progress, &progress->list);
 550                 handler->n_progress++;
 551         }
 552
 553         size_bytes = size;
 554         for (i = 0; i < strlen(units); i++) {
 555                 if (units[i] == suffix)
 556                         break;
 557         }
 558
 559         if (i >= strlen(units)) {
 560             pb_log("Couldn't recognise suffix '%c'\n", suffix);
 561             size_bytes = 0;
 562         } else {
 563                 while (i--)
 564                         size_bytes <<= 10;
 565         }
 566
 567         progress->percentage = percentage;
 568         progress->size = size_bytes;
 569
 570         /*
 571          * Aggregate the info we have and update status. If a progress struct
 572          * has zero for both percentage and size we assume progress information
 573          * is unavailable and fall back to a generic progress message.
 574          */
 575         list_for_each_entry(&handler->progress, p, list) {
 576                 uint64_t c;
 577                 double t;
 578                 if (!p->percentage || !p->size) {
 579                         update = talloc_asprintf(handler,
 580                                         _("%u downloads in progress..."),
 581                                         handler->n_progress);
 582                         current = total = 0;
 583                         break;
 584                 }
 585
 586                 c = p->size;
 587                 t = (100 * c) / p->percentage;
 588
 589                 current += c;
 590                 total += t;
 591         }
 592
 593         if (total) {
 594                 current_converted = current;
 595                 while (current_converted >= 1000) {
 596                         current_converted >>= 10;
 597                         unit++;
 598                 }
 599                 update = talloc_asprintf(handler,
 600                                 _("%u %s downloading: %.0f%% - %lu%cB"),
 601                                 handler->n_progress,
 602                                 ngettext("item", "items", handler->n_progress),
 603                                 (current / total) * 100, current_converted,
 604                                 units[unit]);
 605         }
 606
 607         if (!update) {
 608                 pb_log("%s: failed to allocate new status\n", __func__);
 609         } else {
 610                 device_handler_status_info(handler, "%s\n", update);
 611                 talloc_free(update);
 612         }
 613 }
 614
 615 void device_handler_status_download_remove(struct device_handler *handler,
 616                 struct process_info *procinfo)
 617 {
 618         struct progress_info *p, *tmp;
 619
 620         list_for_each_entry_safe(&handler->progress, p, tmp, list)
 621                 if (p->procinfo == procinfo) {
 622                         list_remove(&p->list);
 623                         talloc_free(p);
 624                         handler->n_progress--;
 625                 }
 626 }
 627
 628 static void device_handler_boot_status_cb(void *arg, struct status *status)
 629 {
 630         device_handler_status(arg, status);
 631 }
 632
 633 static void countdown_status(struct device_handler *handler,
 634                 struct discover_boot_option *opt, unsigned int sec)
 635 {
 636         struct status status;
 637
 638         status.type = STATUS_INFO;
 639         status.message = talloc_asprintf(handler,
 640                         _("Booting in %d sec: %s"), sec, opt->option->name);
 641         status.backlog = false;
 642
 643         device_handler_status(handler, &status);
 644
 645         talloc_free(status.message);
 646 }
 647
 648 static int default_timeout(void *arg)
 649 {
 650         struct device_handler *handler = arg;
 651         struct discover_boot_option *opt;
 652
 653         if (!handler->default_boot_option)
 654                 return 0;
 655
 656         if (handler->pending_boot)
 657                 return 0;
 658
 659         opt = handler->default_boot_option;
 660
 661         if (handler->sec_to_boot) {
 662                 countdown_status(handler, opt, handler->sec_to_boot);
 663                 handler->sec_to_boot--;
 664                 handler->timeout_waiter = waiter_register_timeout(
 665                                                 handler->waitset, 1000,
 666                                                 default_timeout, handler);
 667                 return 0;
 668         }
 669
 670         handler->timeout_waiter = NULL;
 671
 672         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 673
 674         platform_pre_boot();
 675
 676         handler->pending_boot = boot(handler, handler->default_boot_option,
 677                         NULL, handler->dry_run, device_handler_boot_status_cb,
 678                         handler);
 679         handler->pending_boot_is_default = true;
 680         return 0;
 681 }
 682
 683 struct {
 684         enum ipmi_bootdev       ipmi_type;
 685         enum device_type        device_type;
 686 } device_type_map[] = {
 687         { IPMI_BOOTDEV_NETWORK, DEVICE_TYPE_NETWORK },
 688         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_DISK },
 689         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_USB },
 690         { IPMI_BOOTDEV_CDROM, DEVICE_TYPE_OPTICAL },
 691 };
 692
 693 static bool ipmi_device_type_matches(enum ipmi_bootdev ipmi_type,
 694                 enum device_type device_type)
 695 {
 696         unsigned int i;
 697
 698         for (i = 0; i < ARRAY_SIZE(device_type_map); i++) {
 699                 if (device_type_map[i].device_type == device_type)
 700                         return device_type_map[i].ipmi_type == ipmi_type;
 701         }
 702
 703         return false;
 704 }
 705
 706 static int autoboot_option_priority(const struct config *config,
 707                                 struct discover_boot_option *opt)
 708 {
 709         enum device_type type = opt->device->device->type;
 710         const char *uuid = opt->device->uuid;
 711         struct autoboot_option *auto_opt;
 712         unsigned int i;
 713
 714         for (i = 0; i < config->n_autoboot_opts; i++) {
 715                 auto_opt = &config->autoboot_opts[i];
 716                 if (auto_opt->boot_type == BOOT_DEVICE_UUID)
 717                         if (!strcmp(auto_opt->uuid, uuid))
 718                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 719
 720                 if (auto_opt->boot_type == BOOT_DEVICE_TYPE)
 721                         if (auto_opt->type == type ||
 722                             auto_opt->type == DEVICE_TYPE_ANY)
 723                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 724         }
 725
 726         return -1;
 727 }
 728
 729 /*
 730  * We have different priorities to resolve conflicts between boot options that
 731  * report to be the default for their device. This function assigns a priority
 732  * for these options.
 733  */
 734 static enum default_priority default_option_priority(
 735                 struct discover_boot_option *opt)
 736 {
 737         const struct config *config;
 738
 739         config = config_get();
 740
 741         /* We give highest priority to IPMI-configured boot options. If
 742          * we have an IPMI bootdev configuration set, then we don't allow
 743          * any other defaults */
 744         if (config->ipmi_bootdev) {
 745                 bool ipmi_match = ipmi_device_type_matches(config->ipmi_bootdev,
 746                                 opt->device->device->type);
 747                 if (ipmi_match)
 748                         return DEFAULT_PRIORITY_REMOTE;
 749
 750                 pb_debug("handler: disabled default priority due to "
 751                                 "non-matching IPMI type %x\n",
 752                                 config->ipmi_bootdev);
 753                 return DEFAULT_PRIORITY_DISABLED;
 754         }
 755
 756         /* Next, try to match the option against the user-defined autoboot
 757          * options, either by device UUID or type. */
 758         if (config->n_autoboot_opts) {
 759                 int boot_match = autoboot_option_priority(config, opt);
 760                 if (boot_match > 0)
 761                         return boot_match;
 762         }
 763
 764         /* If the option didn't match any entry in the array, it is disabled */
 765         pb_debug("handler: disabled default priority due to "
 766                         "non-matching UUID or type\n");
 767         return DEFAULT_PRIORITY_DISABLED;
 768 }
 769
 770 static void set_default(struct device_handler *handler,
 771                 struct discover_boot_option *opt)
 772 {
 773         enum default_priority cur_prio, new_prio;
 774
 775         if (!handler->autoboot_enabled)
 776                 return;
 777
 778         pb_debug("handler: new default option: %s\n", opt->option->id);
 779
 780         new_prio = default_option_priority(opt);
 781
 782         /* Anything outside our range prevents a default boot */
 783         if (new_prio >= DEFAULT_PRIORITY_DISABLED)
 784                 return;
 785
 786         pb_debug("handler: calculated priority %d\n", new_prio);
 787
 788         /* Resolve any conflicts: if we have a new default option, it only
 789          * replaces the current if it has a higher priority. */
 790         if (handler->default_boot_option) {
 791
 792                 cur_prio = handler->default_boot_option_priority;
 793
 794                 if (new_prio < cur_prio) {
 795                         pb_log("handler: new prio %d beats "
 796                                         "old prio %d for %s\n",
 797                                         new_prio, cur_prio,
 798                                         handler->default_boot_option
 799                                                 ->option->id);
 800                         handler->default_boot_option = opt;
 801                         handler->default_boot_option_priority = new_prio;
 802                         /* extend the timeout a little, so the user sees some
 803                          * indication of the change */
 804                         handler->sec_to_boot += 2;
 805                 }
 806
 807                 return;
 808         }
 809
 810         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 811         handler->default_boot_option = opt;
 812         handler->default_boot_option_priority = new_prio;
 813
 814         pb_log("handler: boot option %s set as default, timeout %u sec.\n",
 815                opt->option->id, handler->sec_to_boot);
 816
 817         default_timeout(handler);
 818 }
 819
 820 static bool resource_is_resolved(struct resource *res)
 821 {
 822         return !res || res->resolved;
 823 }
 824
 825 /* We only use this in an assert, which will disappear if we're compiling
 826  * with NDEBUG, so we need the 'used' attribute for these builds */
 827 static bool __attribute__((used)) boot_option_is_resolved(
 828                 struct discover_boot_option *opt)
 829 {
 830         return resource_is_resolved(opt->boot_image) &&
 831                 resource_is_resolved(opt->initrd) &&
 832                 resource_is_resolved(opt->dtb) &&
 833                 resource_is_resolved(opt->args_sig_file) &&
 834                 resource_is_resolved(opt->icon);
 835 }
 836
 837 static bool resource_resolve(struct resource *res, const char *name,
 838                 struct discover_boot_option *opt,
 839                 struct device_handler *handler)
 840 {
 841         struct parser *parser = opt->source;
 842
 843         if (resource_is_resolved(res))
 844                 return true;
 845
 846         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
 847                         opt->option->id, name, parser->name);
 848         parser->resolve_resource(handler, res);
 849
 850         return res->resolved;
 851 }
 852
 853 static bool boot_option_resolve(struct discover_boot_option *opt,
 854                 struct device_handler *handler)
 855 {
 856         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 857                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 858                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 859                 resource_resolve(opt->args_sig_file, "args_sig_file", opt,
 860                         handler) &&
 861                 resource_resolve(opt->icon, "icon", opt, handler);
 862 }
 863
 864 static void boot_option_finalise(struct device_handler *handler,
 865                 struct discover_boot_option *opt)
 866 {
 867         assert(boot_option_is_resolved(opt));
 868
 869         /* check that the parsers haven't set any of the final data */
 870         assert(!opt->option->boot_image_file);
 871         assert(!opt->option->initrd_file);
 872         assert(!opt->option->dtb_file);
 873         assert(!opt->option->icon_file);
 874         assert(!opt->option->device_id);
 875         assert(!opt->option->args_sig_file);
 876
 877         if (opt->boot_image)
 878                 opt->option->boot_image_file = opt->boot_image->url->full;
 879         if (opt->initrd)
 880                 opt->option->initrd_file = opt->initrd->url->full;
 881         if (opt->dtb)
 882                 opt->option->dtb_file = opt->dtb->url->full;
 883         if (opt->icon)
 884                 opt->option->icon_file = opt->icon->url->full;
 885         if (opt->args_sig_file)
 886                 opt->option->args_sig_file = opt->args_sig_file->url->full;
 887
 888         opt->option->device_id = opt->device->device->id;
 889
 890         if (opt->option->is_default)
 891                 set_default(handler, opt);
 892 }
 893
 894 static void notify_boot_option(struct device_handler *handler,
 895                 struct discover_boot_option *opt)
 896 {
 897         struct discover_device *dev = opt->device;
 898
 899         if (!dev->notified)
 900                 discover_server_notify_device_add(handler->server,
 901                                                   opt->device->device);
 902         dev->notified = true;
 903         discover_server_notify_boot_option_add(handler->server, opt->option);
 904 }
 905
 906 static void process_boot_option_queue(struct device_handler *handler)
 907 {
 908         struct discover_boot_option *opt, *tmp;
 909
 910         list_for_each_entry_safe(&handler->unresolved_boot_options,
 911                         opt, tmp, list) {
 912
 913                 pb_debug("queue: attempting resolution for %s\n",
 914                                 opt->option->id);
 915
 916                 if (!boot_option_resolve(opt, handler))
 917                         continue;
 918
 919                 pb_debug("\tresolved!\n");
 920
 921                 list_remove(&opt->list);
 922                 list_add_tail(&opt->device->boot_options, &opt->list);
 923                 talloc_steal(opt->device, opt);
 924                 boot_option_finalise(handler, opt);
 925                 notify_boot_option(handler, opt);
 926         }
 927 }
 928
 929 struct discover_context *device_handler_discover_context_create(
 930                 struct device_handler *handler,
 931                 struct discover_device *device)
 932 {
 933         struct discover_context *ctx;
 934
 935         ctx = talloc_zero(handler, struct discover_context);
 936         ctx->handler = handler;
 937         ctx->device = device;
 938         list_init(&ctx->boot_options);
 939
 940         return ctx;
 941 }
 942
 943 void device_handler_add_device(struct device_handler *handler,
 944                 struct discover_device *device)
 945 {
 946         handler->n_devices++;
 947         handler->devices = talloc_realloc(handler, handler->devices,
 948                                 struct discover_device *, handler->n_devices);
 949         handler->devices[handler->n_devices - 1] = device;
 950
 951         if (device->device->type == DEVICE_TYPE_NETWORK)
 952                 network_register_device(handler->network, device);
 953 }
 954
 955 void device_handler_add_ramdisk(struct device_handler *handler,
 956                 const char *path)
 957 {
 958         struct ramdisk_device *dev;
 959         unsigned int i;
 960
 961         if (!path)
 962                 return;
 963
 964         for (i = 0; i < handler->n_ramdisks; i++)
 965                 if (!strcmp(handler->ramdisks[i]->path, path))
 966                         return;
 967
 968         dev = talloc_zero(handler, struct ramdisk_device);
 969         if (!dev) {
 970                 pb_log("Failed to allocate memory to track %s\n", path);
 971                 return;
 972         }
 973
 974         dev->path = talloc_strdup(handler, path);
 975
 976         handler->ramdisks = talloc_realloc(handler, handler->ramdisks,
 977                                 struct ramdisk_device *,
 978                                 handler->n_ramdisks + 1);
 979         if (!handler->ramdisks) {
 980                 pb_log("Failed to reallocate memory"
 981                        "- ramdisk tracking inconsistent!\n");
 982                 return;
 983         }
 984
 985         handler->ramdisks[i] = dev;
 986         i = handler->n_ramdisks++;
 987 }
 988
 989 struct ramdisk_device *device_handler_get_ramdisk(
 990                 struct device_handler *handler)
 991 {
 992         unsigned int i;
 993         char *name;
 994         dev_t id;
 995
 996         /* Check if free ramdisk exists */
 997         for (i = 0; i < handler->n_ramdisks; i++)
 998                 if (!handler->ramdisks[i]->snapshot &&
 999                     !handler->ramdisks[i]->origin &&
1000                     !handler->ramdisks[i]->base)
1001                         return handler->ramdisks[i];
1002
1003         /* Otherwise create a new one */
1004         name = talloc_asprintf(handler, "/dev/ram%d",
1005                         handler->n_ramdisks);
1006         if (!name) {
1007                 pb_debug("Failed to allocate memory to name /dev/ram%d",
1008                         handler->n_ramdisks);
1009                 return NULL;
1010         }
1011
1012         id = makedev(1, handler->n_ramdisks);
1013         if (mknod(name, S_IFBLK, id)) {
1014                 if (errno == EEXIST) {
1015                         /* We haven't yet received updates for existing
1016                          * ramdisks - add and use this one */
1017                         pb_debug("Using untracked ramdisk %s\n", name);
1018                 } else {
1019                         pb_log("Failed to create new ramdisk %s: %s\n",
1020                                name, strerror(errno));
1021                         return NULL;
1022                 }
1023         }
1024         device_handler_add_ramdisk(handler, name);
1025         talloc_free(name);
1026
1027         return handler->ramdisks[i];
1028 }
1029
1030 void device_handler_release_ramdisk(struct discover_device *device)
1031 {
1032         struct ramdisk_device *ramdisk = device->ramdisk;
1033
1034         talloc_free(ramdisk->snapshot);
1035         talloc_free(ramdisk->origin);
1036         talloc_free(ramdisk->base);
1037
1038         ramdisk->snapshot = ramdisk->origin = ramdisk->base = NULL;
1039         ramdisk->sectors = 0;
1040
1041         device->ramdisk = NULL;
1042 }
1043
1044 /* Start discovery on a hotplugged device. The device will be in our devices
1045  * array, but has only just been initialised by the hotplug source.
1046  */
1047 int device_handler_discover(struct device_handler *handler,
1048                 struct discover_device *dev)
1049 {
1050         struct discover_context *ctx;
1051         int rc;
1052
1053         device_handler_status_dev_info(handler, dev,
1054                 /*
1055                  * TRANSLATORS: this string will be passed the type of the
1056                  * device (eg "disk" or "network"), which will be translated
1057                  * accordingly.
1058                  */
1059                 _("Processing new %s device"),
1060                 device_type_display_name(dev->device->type));
1061
1062         /* create our context */
1063         ctx = device_handler_discover_context_create(handler, dev);
1064
1065         rc = mount_device(dev);
1066         if (rc)
1067                 goto out;
1068
1069         /* add this device to our system info */
1070         system_info_register_blockdev(dev->device->id, dev->uuid,
1071                         dev->mount_path);
1072
1073         /* run the parsers. This will populate the ctx's boot_option list. */
1074         iterate_parsers(ctx);
1075
1076         /* add discovered stuff to the handler */
1077         device_handler_discover_context_commit(handler, ctx);
1078
1079         process_boot_option_queue(handler);
1080 out:
1081         talloc_unlink(handler, ctx);
1082
1083         return 0;
1084 }
1085
1086 /* Incoming dhcp event */
1087 int device_handler_dhcp(struct device_handler *handler,
1088                 struct discover_device *dev, struct event *event)
1089 {
1090         struct discover_context *ctx;
1091
1092         device_handler_status_dev_info(handler, dev,
1093                         _("Processing DHCP lease response (ip: %s)"),
1094                         event_get_param(event, "ip"));
1095
1096         /* create our context */
1097         ctx = device_handler_discover_context_create(handler, dev);
1098         talloc_steal(ctx, event);
1099         ctx->event = event;
1100
1101         iterate_parsers(ctx);
1102
1103         device_handler_discover_context_commit(handler, ctx);
1104
1105         talloc_unlink(handler, ctx);
1106
1107         return 0;
1108 }
1109
1110 static struct discover_boot_option *find_boot_option_by_id(
1111                 struct device_handler *handler, const char *id)
1112 {
1113         unsigned int i;
1114
1115         for (i = 0; i < handler->n_devices; i++) {
1116                 struct discover_device *dev = handler->devices[i];
1117                 struct discover_boot_option *opt;
1118
1119                 list_for_each_entry(&dev->boot_options, opt, list)
1120                         if (!strcmp(opt->option->id, id))
1121                                 return opt;
1122         }
1123
1124         return NULL;
1125 }
1126
1127 void device_handler_boot(struct device_handler *handler,
1128                 struct boot_command *cmd)
1129 {
1130         struct discover_boot_option *opt = NULL;
1131
1132         if (cmd->option_id && strlen(cmd->option_id))
1133                 opt = find_boot_option_by_id(handler, cmd->option_id);
1134
1135         if (handler->pending_boot)
1136                 boot_cancel(handler->pending_boot);
1137
1138         platform_pre_boot();
1139
1140         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
1141                         device_handler_boot_status_cb, handler);
1142         handler->pending_boot_is_default = false;
1143 }
1144
1145 void device_handler_cancel_default(struct device_handler *handler)
1146 {
1147         if (handler->timeout_waiter)
1148                 waiter_remove(handler->timeout_waiter);
1149
1150         handler->timeout_waiter = NULL;
1151         handler->autoboot_enabled = false;
1152
1153         /* we only send status if we had a default boot option queued */
1154         if (!handler->default_boot_option)
1155                 return;
1156
1157         pb_log("Cancelling default boot option\n");
1158
1159         if (handler->pending_boot && handler->pending_boot_is_default) {
1160                 boot_cancel(handler->pending_boot);
1161                 handler->pending_boot = NULL;
1162                 handler->pending_boot_is_default = false;
1163         }
1164
1165         handler->default_boot_option = NULL;
1166
1167         device_handler_status_info(handler, _("Default boot cancelled"));
1168 }
1169
1170 void device_handler_update_config(struct device_handler *handler,
1171                 struct config *config)
1172 {
1173         int rc;
1174
1175         rc = config_set(config);
1176         if (rc)
1177                 return;
1178
1179         discover_server_notify_config(handler->server, config);
1180         device_handler_update_lang(config->lang);
1181         device_handler_reinit(handler);
1182 }
1183
1184 static char *device_from_addr(void *ctx, struct pb_url *url)
1185 {
1186         char *ipaddr, *buf, *tok, *dev = NULL;
1187         const char *delim = " ";
1188         struct sockaddr_in *ip;
1189         struct sockaddr_in si;
1190         struct addrinfo *res;
1191         struct process *p;
1192         int rc;
1193
1194         /* Note: IPv4 only */
1195         rc = inet_pton(AF_INET, url->host, &(si.sin_addr));
1196         if (rc > 0) {
1197                 ipaddr = url->host;
1198         } else {
1199                 /* need to turn hostname into a valid IP */
1200                 rc = getaddrinfo(url->host, NULL, NULL, &res);
1201                 if (rc) {
1202                         pb_debug("%s: Invalid URL\n",__func__);
1203                         return NULL;
1204                 }
1205                 ipaddr = talloc_array(ctx,char,INET_ADDRSTRLEN);
1206                 ip = (struct sockaddr_in *) res->ai_addr;
1207                 inet_ntop(AF_INET, &(ip->sin_addr), ipaddr, INET_ADDRSTRLEN);
1208                 freeaddrinfo(res);
1209         }
1210
1211         const char *argv[] = {
1212                 pb_system_apps.ip,
1213                 "route", "show", "to", "match",
1214                 ipaddr,
1215                 NULL
1216         };
1217
1218         p = process_create(ctx);
1219
1220         p->path = pb_system_apps.ip;
1221         p->argv = argv;
1222         p->keep_stdout = true;
1223
1224         rc = process_run_sync(p);
1225
1226         if (rc || p->exit_status) {
1227                 /* ip has complained for some reason; most likely
1228                  * there is no route to the host - bail out */
1229                 pb_debug("%s: `ip` returns non-zero exit status\n", __func__);
1230                 pb_debug("ip buf: %s\n", p->stdout_buf);
1231                 process_release(p);
1232                 return NULL;
1233         }
1234
1235         buf = p->stdout_buf;
1236         /* If a route is found, ip-route output will be of the form
1237          * "... dev DEVNAME ... " */
1238         tok = strtok(buf, delim);
1239         while (tok) {
1240                 if (!strcmp(tok, "dev")) {
1241                         tok = strtok(NULL, delim);
1242                         dev = talloc_strdup(ctx, tok);
1243                         break;
1244                 }
1245                 tok = strtok(NULL, delim);
1246         }
1247
1248         process_release(p);
1249         if (dev)
1250                 pb_debug("%s: Found interface '%s'\n", __func__,dev);
1251         return dev;
1252 }
1253
1254 void device_handler_process_url(struct device_handler *handler,
1255                 const char *url, const char *mac, const char *ip)
1256 {
1257         struct discover_context *ctx;
1258         struct discover_device *dev;
1259         struct pb_url *pb_url;
1260         struct event *event;
1261         struct param *param;
1262
1263         if (!handler->network) {
1264                 device_handler_status_err(handler, _("No network configured"));
1265                 return;
1266         }
1267
1268         event = talloc(handler, struct event);
1269         event->type = EVENT_TYPE_USER;
1270         event->action = EVENT_ACTION_URL;
1271
1272         if (url[strlen(url) - 1] == '/') {
1273                 event->params = talloc_array(event, struct param, 3);
1274                 param = &event->params[0];
1275                 param->name = talloc_strdup(event, "pxepathprefix");
1276                 param->value = talloc_strdup(event, url);
1277                 param = &event->params[1];
1278                 param->name = talloc_strdup(event, "mac");
1279                 param->value = talloc_strdup(event, mac);
1280                 param = &event->params[2];
1281                 param->name = talloc_strdup(event, "ip");
1282                 param->value = talloc_strdup(event, ip);
1283                 event->n_params = 3;
1284         } else {
1285                 event->params = talloc_array(event, struct param, 1);
1286                 param = &event->params[0];
1287                 param->name = talloc_strdup(event, "pxeconffile");
1288                 param->value = talloc_strdup(event, url);
1289                 event->n_params = 1;
1290         }
1291
1292         pb_url = pb_url_parse(event, event->params->value);
1293         if (!pb_url || (pb_url->scheme != pb_url_file && !pb_url->host)) {
1294                 device_handler_status_err(handler, _("Invalid config URL!"));
1295                 return;
1296         }
1297
1298         if (pb_url->scheme == pb_url_file)
1299                 event->device = talloc_asprintf(event, "local");
1300         else
1301                 event->device = device_from_addr(event, pb_url);
1302
1303         if (!event->device) {
1304                 device_handler_status_err(handler,
1305                                         _("Unable to route to host %s"),
1306                                         pb_url->host);
1307                 return;
1308         }
1309
1310         dev = discover_device_create(handler, mac, event->device);
1311         if (pb_url->scheme == pb_url_file)
1312                 dev->device->type = DEVICE_TYPE_ANY;
1313         ctx = device_handler_discover_context_create(handler, dev);
1314         talloc_steal(ctx, event);
1315         ctx->event = event;
1316
1317         iterate_parsers(ctx);
1318
1319         device_handler_discover_context_commit(handler, ctx);
1320
1321         talloc_unlink(handler, ctx);
1322 }
1323
1324 #ifndef PETITBOOT_TEST
1325
1326 /**
1327  * context_commit - Commit a temporary discovery context to the handler,
1328  * and notify the clients about any new options / devices
1329  */
1330 void device_handler_discover_context_commit(struct device_handler *handler,
1331                 struct discover_context *ctx)
1332 {
1333         struct discover_device *dev = ctx->device;
1334         struct discover_boot_option *opt, *tmp;
1335
1336         if (!device_lookup_by_uuid(handler, dev->uuid))
1337                 device_handler_add_device(handler, dev);
1338
1339         /* move boot options from the context to the device */
1340         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
1341                 list_remove(&opt->list);
1342
1343                 /* All boot options need at least a kernel image */
1344                 if (!opt->boot_image || !opt->boot_image->url) {
1345                         pb_log("boot option %s is missing boot image, ignoring\n",
1346                                 opt->option->id);
1347                         talloc_free(opt);
1348                         continue;
1349                 }
1350
1351                 if (boot_option_resolve(opt, handler)) {
1352                         pb_log("boot option %s is resolved, "
1353                                         "sending to clients\n",
1354                                         opt->option->id);
1355                         list_add_tail(&dev->boot_options, &opt->list);
1356                         talloc_steal(dev, opt);
1357                         boot_option_finalise(handler, opt);
1358                         notify_boot_option(handler, opt);
1359                 } else {
1360                         if (!opt->source->resolve_resource) {
1361                                 pb_log("parser %s gave us an unresolved "
1362                                         "resource (%s), but no way to "
1363                                         "resolve it\n",
1364                                         opt->source->name, opt->option->id);
1365                                 talloc_free(opt);
1366                         } else {
1367                                 pb_log("boot option %s is unresolved, "
1368                                                 "adding to queue\n",
1369                                                 opt->option->id);
1370                                 list_add(&handler->unresolved_boot_options,
1371                                                 &opt->list);
1372                                 talloc_steal(handler, opt);
1373                         }
1374                 }
1375         }
1376 }
1377
1378 static void device_handler_update_lang(const char *lang)
1379 {
1380         const char *cur_lang;
1381
1382         if (!lang)
1383                 return;
1384
1385         cur_lang = setlocale(LC_ALL, NULL);
1386         if (cur_lang && !strcmp(cur_lang, lang))
1387                 return;
1388
1389         setlocale(LC_ALL, lang);
1390 }
1391
1392 static int device_handler_init_sources(struct device_handler *handler)
1393 {
1394         /* init our device sources: udev, network and user events */
1395         handler->udev = udev_init(handler, handler->waitset);
1396         if (!handler->udev)
1397                 return -1;
1398
1399         handler->network = network_init(handler, handler->waitset,
1400                         handler->dry_run);
1401         if (!handler->network)
1402                 return -1;
1403
1404         handler->user_event = user_event_init(handler, handler->waitset);
1405         if (!handler->user_event)
1406                 return -1;
1407
1408         return 0;
1409 }
1410
1411 static void device_handler_reinit_sources(struct device_handler *handler)
1412 {
1413         /* if we haven't initialised sources previously (becuase we started in
1414          * safe mode), then init once here. */
1415         if (!(handler->udev || handler->network || handler->user_event)) {
1416                 device_handler_init_sources(handler);
1417                 return;
1418         }
1419
1420         udev_reinit(handler->udev);
1421
1422         network_shutdown(handler->network);
1423         handler->network = network_init(handler, handler->waitset,
1424                         handler->dry_run);
1425 }
1426
1427 static inline const char *get_device_path(struct discover_device *dev)
1428 {
1429         return dev->ramdisk ? dev->ramdisk->snapshot : dev->device_path;
1430 }
1431
1432 static char *check_subvols(struct discover_device *dev)
1433 {
1434         const char *fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1435         struct stat sb;
1436         char *path;
1437         int rc;
1438
1439         if (strncmp(fstype, "btrfs", strlen("btrfs")))
1440                 return dev->mount_path;
1441
1442         /* On btrfs a device's root may be under a subvolume path */
1443         path = join_paths(dev, dev->mount_path, "@");
1444         rc = stat(path, &sb);
1445         if (!rc && S_ISDIR(sb.st_mode)) {
1446                 pb_debug("Using '%s' for btrfs root path\n", path);
1447                 return path;
1448         }
1449
1450         talloc_free(path);
1451         return dev->mount_path;
1452 }
1453
1454 static bool check_existing_mount(struct discover_device *dev)
1455 {
1456         struct stat devstat, mntstat;
1457         const char *device_path;
1458         struct mntent *mnt;
1459         FILE *fp;
1460         int rc;
1461
1462         device_path = get_device_path(dev);
1463
1464         rc = stat(device_path, &devstat);
1465         if (rc) {
1466                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
1467                 return false;
1468         }
1469
1470         if (!S_ISBLK(devstat.st_mode)) {
1471                 pb_debug("%s: %s isn't a block device?\n", __func__,
1472                                 dev->device_path);
1473                 return false;
1474         }
1475
1476         fp = fopen("/proc/self/mounts", "r");
1477
1478         for (;;) {
1479                 mnt = getmntent(fp);
1480                 if (!mnt)
1481                         break;
1482
1483                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
1484                         continue;
1485
1486                 rc = stat(mnt->mnt_fsname, &mntstat);
1487                 if (rc)
1488                         continue;
1489
1490                 if (!S_ISBLK(mntstat.st_mode))
1491                         continue;
1492
1493                 if (mntstat.st_rdev == devstat.st_rdev) {
1494                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
1495                         dev->root_path = check_subvols(dev);
1496                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
1497                         dev->mounted = true;
1498                         dev->unmount = false;
1499
1500                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
1501                                         __func__, dev->device_path,
1502                                         dev->mounted_rw ? 'w' : 'o',
1503                                         mnt->mnt_dir);
1504                         break;
1505                 }
1506         }
1507
1508         fclose(fp);
1509
1510         return mnt != NULL;
1511 }
1512
1513 /*
1514  * Attempt to mount a filesystem safely, while handling certain filesytem-
1515  * specific options
1516  */
1517 static int try_mount(const char *device_path, const char *mount_path,
1518                              const char *fstype, unsigned long flags,
1519                              bool have_snapshot)
1520 {
1521         const char *fs, *safe_opts;
1522         int rc;
1523
1524         /* Mount ext3 as ext4 instead so 'norecovery' can be used */
1525         if (strncmp(fstype, "ext3", strlen("ext3")) == 0) {
1526                 pb_debug("Mounting ext3 filesystem as ext4\n");
1527                 fs = "ext4";
1528         } else
1529                 fs = fstype;
1530
1531         if (strncmp(fs, "xfs", strlen("xfs")) == 0 ||
1532             strncmp(fs, "ext4", strlen("ext4")) == 0)
1533                 safe_opts = "norecovery";
1534         else
1535                 safe_opts = NULL;
1536
1537         errno = 0;
1538         /* If no snapshot is available don't attempt recovery */
1539         if (!have_snapshot)
1540                 return mount(device_path, mount_path, fs, flags, safe_opts);
1541
1542         rc = mount(device_path, mount_path, fs, flags, NULL);
1543
1544         if (!rc)
1545                 return rc;
1546
1547         /* Mounting failed; some filesystems will fail to mount if a recovery
1548          * journal exists (eg. cross-endian XFS), so try again with norecovery
1549          * where that option is available.
1550          * If mounting read-write just return the error as norecovery is not a
1551          * valid option */
1552         if ((flags & MS_RDONLY) != MS_RDONLY || !safe_opts)
1553                 return rc;
1554
1555         errno = 0;
1556         return mount(device_path, mount_path, fs, flags, safe_opts);
1557 }
1558
1559 static int mount_device(struct discover_device *dev)
1560 {
1561         const char *fstype, *device_path;
1562         int rc;
1563
1564         if (!dev->device_path)
1565                 return -1;
1566
1567         if (dev->mounted)
1568                 return 0;
1569
1570         if (check_existing_mount(dev))
1571                 return 0;
1572
1573         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1574         if (!fstype)
1575                 return 0;
1576
1577         dev->mount_path = join_paths(dev, mount_base(),
1578                                         dev->device_path);
1579
1580         if (pb_mkdir_recursive(dev->mount_path)) {
1581                 pb_log("couldn't create mount directory %s: %s\n",
1582                                 dev->mount_path, strerror(errno));
1583                 goto err_free;
1584         }
1585
1586         device_path = get_device_path(dev);
1587
1588         pb_log("mounting device %s read-only\n", dev->device_path);
1589         rc = try_mount(device_path, dev->mount_path, fstype,
1590                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1591
1592         if (!rc) {
1593                 dev->mounted = true;
1594                 dev->mounted_rw = false;
1595                 dev->unmount = true;
1596                 dev->root_path = check_subvols(dev);
1597                 return 0;
1598         }
1599
1600         pb_log("couldn't mount device %s: mount failed: %s\n",
1601                         device_path, strerror(errno));
1602
1603         /* If mount fails clean up any snapshot */
1604         devmapper_destroy_snapshot(dev);
1605
1606         pb_rmdir_recursive(mount_base(), dev->mount_path);
1607 err_free:
1608         talloc_free(dev->mount_path);
1609         dev->mount_path = NULL;
1610         return -1;
1611 }
1612
1613 static int umount_device(struct discover_device *dev)
1614 {
1615         const char *device_path;
1616         int rc;
1617
1618         if (!dev->mounted || !dev->unmount)
1619                 return 0;
1620
1621         device_path = get_device_path(dev);
1622
1623         pb_log("unmounting device %s\n", device_path);
1624         rc = umount(dev->mount_path);
1625         if (rc)
1626                 return -1;
1627
1628         dev->mounted = false;
1629         devmapper_destroy_snapshot(dev);
1630
1631         pb_rmdir_recursive(mount_base(), dev->mount_path);
1632
1633         talloc_free(dev->mount_path);
1634         dev->mount_path = NULL;
1635         dev->root_path = NULL;
1636
1637         return 0;
1638 }
1639
1640 int device_request_write(struct discover_device *dev, bool *release)
1641 {
1642         const char *fstype, *device_path;
1643         const struct config *config;
1644         int rc;
1645
1646         *release = false;
1647
1648         config = config_get();
1649         if (!config->allow_writes)
1650                 return -1;
1651
1652         if (!dev->mounted)
1653                 return -1;
1654
1655         if (dev->mounted_rw)
1656                 return 0;
1657
1658         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1659
1660         device_path = get_device_path(dev);
1661
1662         pb_log("remounting device %s read-write\n", device_path);
1663
1664         rc = umount(dev->mount_path);
1665         if (rc) {
1666                 pb_log("Failed to unmount %s: %s\n",
1667                        dev->mount_path, strerror(errno));
1668                 return -1;
1669         }
1670
1671         rc = try_mount(device_path, dev->mount_path, fstype,
1672                        MS_SILENT, dev->ramdisk);
1673         if (rc)
1674                 goto mount_ro;
1675
1676         dev->mounted_rw = true;
1677         *release = true;
1678         return 0;
1679
1680 mount_ro:
1681         pb_log("Unable to remount device %s read-write: %s\n",
1682                device_path, strerror(errno));
1683         rc = try_mount(device_path, dev->mount_path, fstype,
1684                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1685         if (rc)
1686                 pb_log("Unable to recover mount for %s: %s\n",
1687                        device_path, strerror(errno));
1688         return -1;
1689 }
1690
1691 void device_release_write(struct discover_device *dev, bool release)
1692 {
1693         const char *fstype, *device_path;
1694
1695         if (!release)
1696                 return;
1697
1698         device_path = get_device_path(dev);
1699
1700         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1701
1702         pb_log("remounting device %s read-only\n", device_path);
1703
1704         if (umount(dev->mount_path)) {
1705                 pb_log("Failed to unmount %s\n", dev->mount_path);
1706                 return;
1707         }
1708         dev->mounted_rw = dev->mounted = false;
1709
1710         if (dev->ramdisk) {
1711                 devmapper_merge_snapshot(dev);
1712                 /* device_path becomes stale after merge */
1713                 device_path = get_device_path(dev);
1714         }
1715
1716         if (try_mount(device_path, dev->mount_path, fstype,
1717                        MS_RDONLY | MS_SILENT, dev->ramdisk))
1718                 pb_log("Failed to remount %s read-only: %s\n",
1719                        device_path, strerror(errno));
1720         else
1721                 dev->mounted = true;
1722 }
1723
1724 void device_sync_snapshots(struct device_handler *handler, const char *device)
1725 {
1726         struct discover_device *dev = NULL;
1727         unsigned int i;
1728
1729         if (device) {
1730                 /* Find matching device and sync */
1731                 dev = device_lookup_by_name(handler, device);
1732                 if (!dev) {
1733                         pb_log("%s: device name '%s' unrecognised\n",
1734                                 __func__, device);
1735                         return;
1736                 }
1737                 if (dev->ramdisk)
1738                         device_release_write(dev, true);
1739                 else
1740                         pb_log("%s has no snapshot to merge, skipping\n",
1741                                 dev->device->id);
1742                 return;
1743         }
1744
1745         /* Otherwise sync all relevant devices */
1746         for (i = 0; i < handler->n_devices; i++) {
1747                 dev = handler->devices[i];
1748                 if (dev->device->type != DEVICE_TYPE_DISK &&
1749                         dev->device->type != DEVICE_TYPE_USB)
1750                         continue;
1751                 if (dev->ramdisk)
1752                         device_release_write(dev, true);
1753                 else
1754                         pb_log("%s has no snapshot to merge, skipping\n",
1755                                 dev->device->id);
1756         }
1757 }
1758
1759 #else
1760
1761 void device_handler_discover_context_commit(
1762                 struct device_handler *handler __attribute__((unused)),
1763                 struct discover_context *ctx __attribute__((unused)))
1764 {
1765         pb_log("%s stubbed out for test cases\n", __func__);
1766 }
1767
1768 static void device_handler_update_lang(const char *lang __attribute__((unused)))
1769 {
1770 }
1771
1772 static int device_handler_init_sources(
1773                 struct device_handler *handler __attribute__((unused)))
1774 {
1775         return 0;
1776 }
1777
1778 static void device_handler_reinit_sources(
1779                 struct device_handler *handler __attribute__((unused)))
1780 {
1781 }
1782
1783 static int umount_device(struct discover_device *dev __attribute__((unused)))
1784 {
1785         return 0;
1786 }
1787
1788 static int __attribute__((unused)) mount_device(
1789                 struct discover_device *dev __attribute__((unused)))
1790 {
1791         return 0;
1792 }
1793
1794 int device_request_write(struct discover_device *dev __attribute__((unused)),
1795                 bool *release)
1796 {
1797         *release = true;
1798         return 0;
1799 }
1800
1801 void device_release_write(struct discover_device *dev __attribute__((unused)),
1802         bool release __attribute__((unused)))
1803 {
1804 }
1805
1806 void device_sync_snapshots(
1807                 struct device_handler *handler __attribute__((unused)),
1808                 const char *device __attribute__((unused)))
1809 {
1810 }
1811
1812 #endif