git.ozlabs.org Git - petitboot/blob - discover/device-handler.c

   1 #include <assert.h>
   2 #include <stdlib.h>
   3 #include <stdbool.h>
   4 #include <unistd.h>
   5 #include <string.h>
   6 #include <errno.h>
   7 #include <mntent.h>
   8 #include <locale.h>
   9 #include <sys/stat.h>
  10 #include <sys/wait.h>
  11 #include <sys/mount.h>
  12
  13 #include <talloc/talloc.h>
  14 #include <list/list.h>
  15 #include <log/log.h>
  16 #include <types/types.h>
  17 #include <system/system.h>
  18 #include <process/process.h>
  19 #include <url/url.h>
  20 #include <i18n/i18n.h>
  21
  22 #include <sys/types.h>
  23 #include <sys/socket.h>
  24 #include <netdb.h>
  25 #include <arpa/inet.h>
  26
  27 #include "device-handler.h"
  28 #include "discover-server.h"
  29 #include "devmapper.h"
  30 #include "user-event.h"
  31 #include "platform.h"
  32 #include "event.h"
  33 #include "parser.h"
  34 #include "resource.h"
  35 #include "paths.h"
  36 #include "sysinfo.h"
  37 #include "boot.h"
  38 #include "udev.h"
  39 #include "network.h"
  40 #include "ipmi.h"
  41
  42 enum default_priority {
  43         DEFAULT_PRIORITY_REMOTE         = 1,
  44         DEFAULT_PRIORITY_LOCAL_FIRST    = 2,
  45         DEFAULT_PRIORITY_LOCAL_LAST     = 0xfe,
  46         DEFAULT_PRIORITY_DISABLED       = 0xff,
  47 };
  48
  49 struct device_handler {
  50         struct discover_server  *server;
  51         int                     dry_run;
  52
  53         struct pb_udev          *udev;
  54         struct network          *network;
  55         struct user_event       *user_event;
  56
  57         struct discover_device  **devices;
  58         unsigned int            n_devices;
  59
  60         struct ramdisk_device   **ramdisks;
  61         unsigned int            n_ramdisks;
  62
  63         struct waitset          *waitset;
  64         struct waiter           *timeout_waiter;
  65         bool                    autoboot_enabled;
  66         unsigned int            sec_to_boot;
  67
  68         struct discover_boot_option *default_boot_option;
  69         int                     default_boot_option_priority;
  70
  71         struct list             unresolved_boot_options;
  72
  73         struct boot_task        *pending_boot;
  74         bool                    pending_boot_is_default;
  75 };
  76
  77 static int mount_device(struct discover_device *dev);
  78 static int umount_device(struct discover_device *dev);
  79
  80 static int device_handler_init_sources(struct device_handler *handler);
  81 static void device_handler_reinit_sources(struct device_handler *handler);
  82
  83 static void device_handler_update_lang(const char *lang);
  84
  85 void discover_context_add_boot_option(struct discover_context *ctx,
  86                 struct discover_boot_option *boot_option)
  87 {
  88         boot_option->source = ctx->parser;
  89         list_add_tail(&ctx->boot_options, &boot_option->list);
  90         talloc_steal(ctx, boot_option);
  91 }
  92
  93 /**
  94  * device_handler_get_device_count - Get the count of current handler devices.
  95  */
  96
  97 int device_handler_get_device_count(const struct device_handler *handler)
  98 {
  99         return handler->n_devices;
 100 }
 101
 102 /**
 103  * device_handler_get_device - Get a handler device by index.
 104  */
 105
 106 const struct discover_device *device_handler_get_device(
 107         const struct device_handler *handler, unsigned int index)
 108 {
 109         if (index >= handler->n_devices) {
 110                 assert(0 && "bad index");
 111                 return NULL;
 112         }
 113
 114         return handler->devices[index];
 115 }
 116
 117 struct network *device_handler_get_network(
 118                 const struct device_handler *handler)
 119 {
 120         return handler->network;
 121 }
 122
 123 struct discover_boot_option *discover_boot_option_create(
 124                 struct discover_context *ctx,
 125                 struct discover_device *device)
 126 {
 127         struct discover_boot_option *opt;
 128
 129         opt = talloc_zero(ctx, struct discover_boot_option);
 130         opt->option = talloc_zero(opt, struct boot_option);
 131         opt->device = device;
 132
 133         return opt;
 134 }
 135
 136 static int device_match_uuid(struct discover_device *dev, const char *uuid)
 137 {
 138         return dev->uuid && !strcmp(dev->uuid, uuid);
 139 }
 140
 141 static int device_match_label(struct discover_device *dev, const char *label)
 142 {
 143         return dev->label && !strcmp(dev->label, label);
 144 }
 145
 146 static int device_match_id(struct discover_device *dev, const char *id)
 147 {
 148         return !strcmp(dev->device->id, id);
 149 }
 150
 151 static int device_match_serial(struct discover_device *dev, const char *serial)
 152 {
 153         const char *val = discover_device_get_param(dev, "ID_SERIAL");
 154         return val && !strcmp(val, serial);
 155 }
 156
 157 static struct discover_device *device_lookup(
 158                 struct device_handler *device_handler,
 159                 int (match_fn)(struct discover_device *, const char *),
 160                 const char *str)
 161 {
 162         struct discover_device *dev;
 163         unsigned int i;
 164
 165         if (!str)
 166                 return NULL;
 167
 168         for (i = 0; i < device_handler->n_devices; i++) {
 169                 dev = device_handler->devices[i];
 170
 171                 if (match_fn(dev, str))
 172                         return dev;
 173         }
 174
 175         return NULL;
 176 }
 177
 178 struct discover_device *device_lookup_by_name(struct device_handler *handler,
 179                 const char *name)
 180 {
 181         if (!strncmp(name, "/dev/", strlen("/dev/")))
 182                 name += strlen("/dev/");
 183
 184         return device_lookup_by_id(handler, name);
 185 }
 186
 187 struct discover_device *device_lookup_by_uuid(
 188                 struct device_handler *device_handler,
 189                 const char *uuid)
 190 {
 191         return device_lookup(device_handler, device_match_uuid, uuid);
 192 }
 193
 194 struct discover_device *device_lookup_by_label(
 195                 struct device_handler *device_handler,
 196                 const char *label)
 197 {
 198         return device_lookup(device_handler, device_match_label, label);
 199 }
 200
 201 struct discover_device *device_lookup_by_id(
 202                 struct device_handler *device_handler,
 203                 const char *id)
 204 {
 205         return device_lookup(device_handler, device_match_id, id);
 206 }
 207
 208 struct discover_device *device_lookup_by_serial(
 209                 struct device_handler *device_handler,
 210                 const char *serial)
 211 {
 212         return device_lookup(device_handler, device_match_serial, serial);
 213 }
 214
 215 void device_handler_destroy(struct device_handler *handler)
 216 {
 217         talloc_free(handler);
 218 }
 219
 220 static int destroy_device(void *arg)
 221 {
 222         struct discover_device *dev = arg;
 223
 224         umount_device(dev);
 225
 226         return 0;
 227 }
 228
 229 struct discover_device *discover_device_create(struct device_handler *handler,
 230                 const char *uuid, const char *id)
 231 {
 232         struct discover_device *dev;
 233
 234         if (uuid)
 235                 dev = device_lookup_by_uuid(handler, uuid);
 236         else
 237                 dev = device_lookup_by_id(handler, id);
 238
 239         if (dev)
 240                 return dev;
 241
 242         dev = talloc_zero(handler, struct discover_device);
 243         dev->device = talloc_zero(dev, struct device);
 244         dev->device->id = talloc_strdup(dev->device, id);
 245         dev->uuid = talloc_strdup(dev, uuid);
 246         list_init(&dev->params);
 247         list_init(&dev->boot_options);
 248
 249         talloc_set_destructor(dev, destroy_device);
 250
 251         return dev;
 252 }
 253
 254 struct discover_device_param {
 255         char                    *name;
 256         char                    *value;
 257         struct list_item        list;
 258 };
 259
 260 void discover_device_set_param(struct discover_device *device,
 261                 const char *name, const char *value)
 262 {
 263         struct discover_device_param *param;
 264         bool found = false;
 265
 266         list_for_each_entry(&device->params, param, list) {
 267                 if (!strcmp(param->name, name)) {
 268                         found = true;
 269                         break;
 270                 }
 271         }
 272
 273         if (!found) {
 274                 if (!value)
 275                         return;
 276                 param = talloc(device, struct discover_device_param);
 277                 param->name = talloc_strdup(param, name);
 278                 list_add(&device->params, &param->list);
 279         } else {
 280                 if (!value) {
 281                         list_remove(&param->list);
 282                         talloc_free(param);
 283                         return;
 284                 }
 285                 talloc_free(param->value);
 286         }
 287
 288         param->value = talloc_strdup(param, value);
 289 }
 290
 291 const char *discover_device_get_param(struct discover_device *device,
 292                 const char *name)
 293 {
 294         struct discover_device_param *param;
 295
 296         list_for_each_entry(&device->params, param, list) {
 297                 if (!strcmp(param->name, name))
 298                         return param->value;
 299         }
 300         return NULL;
 301 }
 302
 303 struct device_handler *device_handler_init(struct discover_server *server,
 304                 struct waitset *waitset, int dry_run)
 305 {
 306         struct device_handler *handler;
 307         int rc;
 308
 309         handler = talloc_zero(NULL, struct device_handler);
 310         handler->server = server;
 311         handler->waitset = waitset;
 312         handler->dry_run = dry_run;
 313         handler->autoboot_enabled = config_get()->autoboot_enabled;
 314
 315         list_init(&handler->unresolved_boot_options);
 316
 317         /* set up our mount point base */
 318         pb_mkdir_recursive(mount_base());
 319
 320         parser_init();
 321
 322         if (config_get()->safe_mode)
 323                 return handler;
 324
 325         rc = device_handler_init_sources(handler);
 326         if (rc) {
 327                 talloc_free(handler);
 328                 return NULL;
 329         }
 330
 331         return handler;
 332 }
 333
 334 void device_handler_reinit(struct device_handler *handler)
 335 {
 336         struct discover_boot_option *opt, *tmp;
 337         struct ramdisk_device *ramdisk;
 338         unsigned int i;
 339
 340         device_handler_cancel_default(handler);
 341
 342         /* free unresolved boot options */
 343         list_for_each_entry_safe(&handler->unresolved_boot_options,
 344                         opt, tmp, list)
 345                 talloc_free(opt);
 346         list_init(&handler->unresolved_boot_options);
 347
 348         /* drop all devices */
 349         for (i = 0; i < handler->n_devices; i++) {
 350                 discover_server_notify_device_remove(handler->server,
 351                                 handler->devices[i]->device);
 352                 ramdisk = handler->devices[i]->ramdisk;
 353                 talloc_free(handler->devices[i]);
 354                 talloc_free(ramdisk);
 355         }
 356
 357         talloc_free(handler->devices);
 358         handler->devices = NULL;
 359         handler->n_devices = 0;
 360         talloc_free(handler->ramdisks);
 361         handler->ramdisks = NULL;
 362         handler->n_ramdisks = 0;
 363
 364         device_handler_reinit_sources(handler);
 365 }
 366
 367 void device_handler_remove(struct device_handler *handler,
 368                 struct discover_device *device)
 369 {
 370         struct discover_boot_option *opt, *tmp;
 371         unsigned int i;
 372
 373         list_for_each_entry_safe(&device->boot_options, opt, tmp, list) {
 374                 if (opt == handler->default_boot_option) {
 375                         pb_log("Default option %s cancelled since device removed",
 376                                         opt->option->name);
 377                         device_handler_cancel_default(handler);
 378                         break;
 379                 }
 380         }
 381
 382         for (i = 0; i < handler->n_devices; i++)
 383                 if (handler->devices[i] == device)
 384                         break;
 385
 386         if (i == handler->n_devices) {
 387                 talloc_free(device);
 388                 return;
 389         }
 390
 391         /* Free any unresolved options, as they're currently allocated
 392          * against the handler */
 393         list_for_each_entry_safe(&handler->unresolved_boot_options,
 394                         opt, tmp, list) {
 395                 if (opt->device != device)
 396                         continue;
 397                 list_remove(&opt->list);
 398                 talloc_free(opt);
 399         }
 400
 401         /* if this is a network device, we have to unregister it from the
 402          * network code */
 403         if (device->device->type == DEVICE_TYPE_NETWORK)
 404                 network_unregister_device(handler->network, device);
 405
 406         handler->n_devices--;
 407         memmove(&handler->devices[i], &handler->devices[i + 1],
 408                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 409         handler->devices = talloc_realloc(handler, handler->devices,
 410                 struct discover_device *, handler->n_devices);
 411
 412         if (device->notified)
 413                 discover_server_notify_device_remove(handler->server,
 414                                                         device->device);
 415
 416         talloc_free(device);
 417 }
 418
 419 void device_handler_status(struct device_handler *handler,
 420                 struct status *status)
 421 {
 422         discover_server_notify_boot_status(handler->server, status);
 423 }
 424
 425 static void _device_handler_vstatus(struct device_handler *handler,
 426                 enum status_type type, const char *fmt, va_list ap)
 427 {
 428         struct status status;
 429
 430         status.type = type;
 431         status.message = talloc_vasprintf(handler, fmt, ap);
 432
 433         device_handler_status(handler, &status);
 434
 435         talloc_free(status.message);
 436 }
 437
 438 static void _device_handler_vdevstatus(struct device_handler *handler,
 439                 struct discover_device *device, enum status_type type,
 440                 const char *fmt, va_list ap)
 441 {
 442         char *msg;
 443
 444         msg = talloc_asprintf(handler, "[%s] %s",
 445                         device ? device->device->id : "unknown", fmt);
 446         _device_handler_vstatus(handler, type, msg, ap);
 447         talloc_free(msg);
 448 }
 449
 450 void device_handler_status_dev_info(struct device_handler *handler,
 451                 struct discover_device *dev, const char *fmt, ...)
 452 {
 453         va_list ap;
 454
 455         va_start(ap, fmt);
 456         _device_handler_vdevstatus(handler, dev, STATUS_INFO, fmt, ap);
 457         va_end(ap);
 458 }
 459
 460 void device_handler_status_dev_err(struct device_handler *handler,
 461                 struct discover_device *dev, const char *fmt, ...)
 462 {
 463         va_list ap;
 464
 465         va_start(ap, fmt);
 466         _device_handler_vdevstatus(handler, dev, STATUS_ERROR, fmt, ap);
 467         va_end(ap);
 468 }
 469
 470 void device_handler_status_info(struct device_handler *handler,
 471                 const char *fmt, ...)
 472 {
 473         va_list ap;
 474
 475         va_start(ap, fmt);
 476         _device_handler_vstatus(handler, STATUS_INFO, fmt, ap);
 477         va_end(ap);
 478 }
 479
 480 void device_handler_status_err(struct device_handler *handler,
 481                 const char *fmt, ...)
 482 {
 483         va_list ap;
 484
 485         va_start(ap, fmt);
 486         _device_handler_vstatus(handler, STATUS_ERROR, fmt, ap);
 487         va_end(ap);
 488 }
 489
 490 static void device_handler_boot_status_cb(void *arg, struct status *status)
 491 {
 492         device_handler_status(arg, status);
 493 }
 494
 495 static void countdown_status(struct device_handler *handler,
 496                 struct discover_boot_option *opt, unsigned int sec)
 497 {
 498         struct status status;
 499
 500         status.type = STATUS_INFO;
 501         status.message = talloc_asprintf(handler,
 502                         _("Booting in %d sec: %s"), sec, opt->option->name);
 503
 504         device_handler_status(handler, &status);
 505
 506         talloc_free(status.message);
 507 }
 508
 509 static int default_timeout(void *arg)
 510 {
 511         struct device_handler *handler = arg;
 512         struct discover_boot_option *opt;
 513
 514         if (!handler->default_boot_option)
 515                 return 0;
 516
 517         if (handler->pending_boot)
 518                 return 0;
 519
 520         opt = handler->default_boot_option;
 521
 522         if (handler->sec_to_boot) {
 523                 countdown_status(handler, opt, handler->sec_to_boot);
 524                 handler->sec_to_boot--;
 525                 handler->timeout_waiter = waiter_register_timeout(
 526                                                 handler->waitset, 1000,
 527                                                 default_timeout, handler);
 528                 return 0;
 529         }
 530
 531         handler->timeout_waiter = NULL;
 532
 533         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 534
 535         platform_pre_boot();
 536
 537         handler->pending_boot = boot(handler, handler->default_boot_option,
 538                         NULL, handler->dry_run, device_handler_boot_status_cb,
 539                         handler);
 540         handler->pending_boot_is_default = true;
 541         return 0;
 542 }
 543
 544 struct {
 545         enum ipmi_bootdev       ipmi_type;
 546         enum device_type        device_type;
 547 } device_type_map[] = {
 548         { IPMI_BOOTDEV_NETWORK, DEVICE_TYPE_NETWORK },
 549         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_DISK },
 550         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_USB },
 551         { IPMI_BOOTDEV_CDROM, DEVICE_TYPE_OPTICAL },
 552 };
 553
 554 static bool ipmi_device_type_matches(enum ipmi_bootdev ipmi_type,
 555                 enum device_type device_type)
 556 {
 557         unsigned int i;
 558
 559         for (i = 0; i < ARRAY_SIZE(device_type_map); i++) {
 560                 if (device_type_map[i].device_type == device_type)
 561                         return device_type_map[i].ipmi_type == ipmi_type;
 562         }
 563
 564         return false;
 565 }
 566
 567 static int autoboot_option_priority(const struct config *config,
 568                                 struct discover_boot_option *opt)
 569 {
 570         enum device_type type = opt->device->device->type;
 571         const char *uuid = opt->device->uuid;
 572         struct autoboot_option *auto_opt;
 573         unsigned int i;
 574
 575         for (i = 0; i < config->n_autoboot_opts; i++) {
 576                 auto_opt = &config->autoboot_opts[i];
 577                 if (auto_opt->boot_type == BOOT_DEVICE_UUID)
 578                         if (!strcmp(auto_opt->uuid, uuid))
 579                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 580
 581                 if (auto_opt->boot_type == BOOT_DEVICE_TYPE)
 582                         if (auto_opt->type == type ||
 583                             auto_opt->type == DEVICE_TYPE_ANY)
 584                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 585         }
 586
 587         return -1;
 588 }
 589
 590 /*
 591  * We have different priorities to resolve conflicts between boot options that
 592  * report to be the default for their device. This function assigns a priority
 593  * for these options.
 594  */
 595 static enum default_priority default_option_priority(
 596                 struct discover_boot_option *opt)
 597 {
 598         const struct config *config;
 599
 600         config = config_get();
 601
 602         /* We give highest priority to IPMI-configured boot options. If
 603          * we have an IPMI bootdev configuration set, then we don't allow
 604          * any other defaults */
 605         if (config->ipmi_bootdev) {
 606                 bool ipmi_match = ipmi_device_type_matches(config->ipmi_bootdev,
 607                                 opt->device->device->type);
 608                 if (ipmi_match)
 609                         return DEFAULT_PRIORITY_REMOTE;
 610
 611                 pb_debug("handler: disabled default priority due to "
 612                                 "non-matching IPMI type %x\n",
 613                                 config->ipmi_bootdev);
 614                 return DEFAULT_PRIORITY_DISABLED;
 615         }
 616
 617         /* Next, try to match the option against the user-defined autoboot
 618          * options, either by device UUID or type. */
 619         if (config->n_autoboot_opts) {
 620                 int boot_match = autoboot_option_priority(config, opt);
 621                 if (boot_match > 0)
 622                         return boot_match;
 623         }
 624
 625         /* If the option didn't match any entry in the array, it is disabled */
 626         pb_debug("handler: disabled default priority due to "
 627                         "non-matching UUID or type\n");
 628         return DEFAULT_PRIORITY_DISABLED;
 629 }
 630
 631 static void set_default(struct device_handler *handler,
 632                 struct discover_boot_option *opt)
 633 {
 634         enum default_priority cur_prio, new_prio;
 635
 636         if (!handler->autoboot_enabled)
 637                 return;
 638
 639         pb_debug("handler: new default option: %s\n", opt->option->id);
 640
 641         new_prio = default_option_priority(opt);
 642
 643         /* Anything outside our range prevents a default boot */
 644         if (new_prio >= DEFAULT_PRIORITY_DISABLED)
 645                 return;
 646
 647         pb_debug("handler: calculated priority %d\n", new_prio);
 648
 649         /* Resolve any conflicts: if we have a new default option, it only
 650          * replaces the current if it has a higher priority. */
 651         if (handler->default_boot_option) {
 652
 653                 cur_prio = handler->default_boot_option_priority;
 654
 655                 if (new_prio < cur_prio) {
 656                         pb_log("handler: new prio %d beats "
 657                                         "old prio %d for %s\n",
 658                                         new_prio, cur_prio,
 659                                         handler->default_boot_option
 660                                                 ->option->id);
 661                         handler->default_boot_option = opt;
 662                         handler->default_boot_option_priority = new_prio;
 663                         /* extend the timeout a little, so the user sees some
 664                          * indication of the change */
 665                         handler->sec_to_boot += 2;
 666                 }
 667
 668                 return;
 669         }
 670
 671         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 672         handler->default_boot_option = opt;
 673         handler->default_boot_option_priority = new_prio;
 674
 675         pb_log("handler: boot option %s set as default, timeout %u sec.\n",
 676                opt->option->id, handler->sec_to_boot);
 677
 678         default_timeout(handler);
 679 }
 680
 681 static bool resource_is_resolved(struct resource *res)
 682 {
 683         return !res || res->resolved;
 684 }
 685
 686 /* We only use this in an assert, which will disappear if we're compiling
 687  * with NDEBUG, so we need the 'used' attribute for these builds */
 688 static bool __attribute__((used)) boot_option_is_resolved(
 689                 struct discover_boot_option *opt)
 690 {
 691         return resource_is_resolved(opt->boot_image) &&
 692                 resource_is_resolved(opt->initrd) &&
 693                 resource_is_resolved(opt->dtb) &&
 694                 resource_is_resolved(opt->args_sig_file) &&
 695                 resource_is_resolved(opt->icon);
 696 }
 697
 698 static bool resource_resolve(struct resource *res, const char *name,
 699                 struct discover_boot_option *opt,
 700                 struct device_handler *handler)
 701 {
 702         struct parser *parser = opt->source;
 703
 704         if (resource_is_resolved(res))
 705                 return true;
 706
 707         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
 708                         opt->option->id, name, parser->name);
 709         parser->resolve_resource(handler, res);
 710
 711         return res->resolved;
 712 }
 713
 714 static bool boot_option_resolve(struct discover_boot_option *opt,
 715                 struct device_handler *handler)
 716 {
 717         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 718                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 719                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 720                 resource_resolve(opt->args_sig_file, "args_sig_file", opt,
 721                         handler) &&
 722                 resource_resolve(opt->icon, "icon", opt, handler);
 723 }
 724
 725 static void boot_option_finalise(struct device_handler *handler,
 726                 struct discover_boot_option *opt)
 727 {
 728         assert(boot_option_is_resolved(opt));
 729
 730         /* check that the parsers haven't set any of the final data */
 731         assert(!opt->option->boot_image_file);
 732         assert(!opt->option->initrd_file);
 733         assert(!opt->option->dtb_file);
 734         assert(!opt->option->icon_file);
 735         assert(!opt->option->device_id);
 736         assert(!opt->option->args_sig_file);
 737
 738         if (opt->boot_image)
 739                 opt->option->boot_image_file = opt->boot_image->url->full;
 740         if (opt->initrd)
 741                 opt->option->initrd_file = opt->initrd->url->full;
 742         if (opt->dtb)
 743                 opt->option->dtb_file = opt->dtb->url->full;
 744         if (opt->icon)
 745                 opt->option->icon_file = opt->icon->url->full;
 746         if (opt->args_sig_file)
 747                 opt->option->args_sig_file = opt->args_sig_file->url->full;
 748
 749         opt->option->device_id = opt->device->device->id;
 750
 751         if (opt->option->is_default)
 752                 set_default(handler, opt);
 753 }
 754
 755 static void notify_boot_option(struct device_handler *handler,
 756                 struct discover_boot_option *opt)
 757 {
 758         struct discover_device *dev = opt->device;
 759
 760         if (!dev->notified)
 761                 discover_server_notify_device_add(handler->server,
 762                                                   opt->device->device);
 763         dev->notified = true;
 764         discover_server_notify_boot_option_add(handler->server, opt->option);
 765 }
 766
 767 static void process_boot_option_queue(struct device_handler *handler)
 768 {
 769         struct discover_boot_option *opt, *tmp;
 770
 771         list_for_each_entry_safe(&handler->unresolved_boot_options,
 772                         opt, tmp, list) {
 773
 774                 pb_debug("queue: attempting resolution for %s\n",
 775                                 opt->option->id);
 776
 777                 if (!boot_option_resolve(opt, handler))
 778                         continue;
 779
 780                 pb_debug("\tresolved!\n");
 781
 782                 list_remove(&opt->list);
 783                 list_add_tail(&opt->device->boot_options, &opt->list);
 784                 talloc_steal(opt->device, opt);
 785                 boot_option_finalise(handler, opt);
 786                 notify_boot_option(handler, opt);
 787         }
 788 }
 789
 790 struct discover_context *device_handler_discover_context_create(
 791                 struct device_handler *handler,
 792                 struct discover_device *device)
 793 {
 794         struct discover_context *ctx;
 795
 796         ctx = talloc_zero(handler, struct discover_context);
 797         ctx->handler = handler;
 798         ctx->device = device;
 799         list_init(&ctx->boot_options);
 800
 801         return ctx;
 802 }
 803
 804 void device_handler_add_device(struct device_handler *handler,
 805                 struct discover_device *device)
 806 {
 807         handler->n_devices++;
 808         handler->devices = talloc_realloc(handler, handler->devices,
 809                                 struct discover_device *, handler->n_devices);
 810         handler->devices[handler->n_devices - 1] = device;
 811
 812         if (device->device->type == DEVICE_TYPE_NETWORK)
 813                 network_register_device(handler->network, device);
 814 }
 815
 816 void device_handler_add_ramdisk(struct device_handler *handler,
 817                 const char *path)
 818 {
 819         struct ramdisk_device *dev;
 820         unsigned int i;
 821
 822         if (!path)
 823                 return;
 824
 825         for (i = 0; i < handler->n_ramdisks; i++)
 826                 if (!strcmp(handler->ramdisks[i]->path, path))
 827                         return;
 828
 829         dev = talloc_zero(handler, struct ramdisk_device);
 830         if (!dev) {
 831                 pb_log("Failed to allocate memory to track %s\n", path);
 832                 return;
 833         }
 834
 835         dev->path = talloc_strdup(handler, path);
 836
 837         handler->ramdisks = talloc_realloc(handler, handler->ramdisks,
 838                                 struct ramdisk_device *,
 839                                 handler->n_ramdisks + 1);
 840         if (!handler->ramdisks) {
 841                 pb_log("Failed to reallocate memory"
 842                        "- ramdisk tracking inconsistent!\n");
 843                 return;
 844         }
 845
 846         handler->ramdisks[i] = dev;
 847         i = handler->n_ramdisks++;
 848 }
 849
 850 struct ramdisk_device *device_handler_get_ramdisk(
 851                 struct device_handler *handler)
 852 {
 853         unsigned int i;
 854         char *name;
 855         dev_t id;
 856
 857         /* Check if free ramdisk exists */
 858         for (i = 0; i < handler->n_ramdisks; i++)
 859                 if (!handler->ramdisks[i]->snapshot &&
 860                     !handler->ramdisks[i]->origin &&
 861                     !handler->ramdisks[i]->base)
 862                         return handler->ramdisks[i];
 863
 864         /* Otherwise create a new one */
 865         name = talloc_asprintf(handler, "/dev/ram%d",
 866                         handler->n_ramdisks);
 867         if (!name) {
 868                 pb_debug("Failed to allocate memory to name /dev/ram%d",
 869                         handler->n_ramdisks);
 870                 return NULL;
 871         }
 872
 873         id = makedev(1, handler->n_ramdisks);
 874         if (mknod(name, S_IFBLK, id)) {
 875                 if (errno == EEXIST) {
 876                         /* We haven't yet received updates for existing
 877                          * ramdisks - add and use this one */
 878                         pb_debug("Using untracked ramdisk %s\n", name);
 879                 } else {
 880                         pb_log("Failed to create new ramdisk %s: %s\n",
 881                                name, strerror(errno));
 882                         return NULL;
 883                 }
 884         }
 885         device_handler_add_ramdisk(handler, name);
 886         talloc_free(name);
 887
 888         return handler->ramdisks[i];
 889 }
 890
 891 void device_handler_release_ramdisk(struct discover_device *device)
 892 {
 893         struct ramdisk_device *ramdisk = device->ramdisk;
 894
 895         talloc_free(ramdisk->snapshot);
 896         talloc_free(ramdisk->origin);
 897         talloc_free(ramdisk->base);
 898
 899         ramdisk->snapshot = ramdisk->origin = ramdisk->base = NULL;
 900         ramdisk->sectors = 0;
 901
 902         device->ramdisk = NULL;
 903 }
 904
 905 /* Start discovery on a hotplugged device. The device will be in our devices
 906  * array, but has only just been initialised by the hotplug source.
 907  */
 908 int device_handler_discover(struct device_handler *handler,
 909                 struct discover_device *dev)
 910 {
 911         struct discover_context *ctx;
 912         int rc;
 913
 914         device_handler_status_dev_info(handler, dev,
 915                 /*
 916                  * TRANSLATORS: this string will be passed the type of the
 917                  * device (eg "disk" or "network"), which will be translated
 918                  * accordingly.
 919                  */
 920                 _("Processing new %s device"),
 921                 device_type_display_name(dev->device->type));
 922
 923         process_boot_option_queue(handler);
 924
 925         /* create our context */
 926         ctx = device_handler_discover_context_create(handler, dev);
 927
 928         rc = mount_device(dev);
 929         if (rc)
 930                 goto out;
 931
 932         /* add this device to our system info */
 933         system_info_register_blockdev(dev->device->id, dev->uuid,
 934                         dev->mount_path);
 935
 936         /* run the parsers. This will populate the ctx's boot_option list. */
 937         iterate_parsers(ctx);
 938
 939         /* add discovered stuff to the handler */
 940         device_handler_discover_context_commit(handler, ctx);
 941
 942 out:
 943         talloc_unlink(handler, ctx);
 944
 945         return 0;
 946 }
 947
 948 /* Incoming dhcp event */
 949 int device_handler_dhcp(struct device_handler *handler,
 950                 struct discover_device *dev, struct event *event)
 951 {
 952         struct discover_context *ctx;
 953
 954         device_handler_status_dev_info(handler, dev,
 955                         _("Processing dhcp event"));
 956
 957         /* create our context */
 958         ctx = device_handler_discover_context_create(handler, dev);
 959         talloc_steal(ctx, event);
 960         ctx->event = event;
 961
 962         iterate_parsers(ctx);
 963
 964         device_handler_discover_context_commit(handler, ctx);
 965
 966         talloc_unlink(handler, ctx);
 967
 968         return 0;
 969 }
 970
 971 static struct discover_boot_option *find_boot_option_by_id(
 972                 struct device_handler *handler, const char *id)
 973 {
 974         unsigned int i;
 975
 976         for (i = 0; i < handler->n_devices; i++) {
 977                 struct discover_device *dev = handler->devices[i];
 978                 struct discover_boot_option *opt;
 979
 980                 list_for_each_entry(&dev->boot_options, opt, list)
 981                         if (!strcmp(opt->option->id, id))
 982                                 return opt;
 983         }
 984
 985         return NULL;
 986 }
 987
 988 void device_handler_boot(struct device_handler *handler,
 989                 struct boot_command *cmd)
 990 {
 991         struct discover_boot_option *opt = NULL;
 992
 993         if (cmd->option_id && strlen(cmd->option_id))
 994                 opt = find_boot_option_by_id(handler, cmd->option_id);
 995
 996         if (handler->pending_boot)
 997                 boot_cancel(handler->pending_boot);
 998
 999         platform_pre_boot();
1000
1001         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
1002                         device_handler_boot_status_cb, handler);
1003         handler->pending_boot_is_default = false;
1004 }
1005
1006 void device_handler_cancel_default(struct device_handler *handler)
1007 {
1008         if (handler->timeout_waiter)
1009                 waiter_remove(handler->timeout_waiter);
1010
1011         handler->timeout_waiter = NULL;
1012         handler->autoboot_enabled = false;
1013
1014         /* we only send status if we had a default boot option queued */
1015         if (!handler->default_boot_option)
1016                 return;
1017
1018         pb_log("Cancelling default boot option\n");
1019
1020         if (handler->pending_boot && handler->pending_boot_is_default) {
1021                 boot_cancel(handler->pending_boot);
1022                 handler->pending_boot = NULL;
1023                 handler->pending_boot_is_default = false;
1024         }
1025
1026         handler->default_boot_option = NULL;
1027
1028         device_handler_status_info(handler, _("Default boot cancelled"));
1029 }
1030
1031 void device_handler_update_config(struct device_handler *handler,
1032                 struct config *config)
1033 {
1034         int rc;
1035
1036         rc = config_set(config);
1037         if (rc)
1038                 return;
1039
1040         discover_server_notify_config(handler->server, config);
1041         device_handler_update_lang(config->lang);
1042         device_handler_reinit(handler);
1043 }
1044
1045 static char *device_from_addr(void *ctx, struct pb_url *url)
1046 {
1047         char *ipaddr, *buf, *tok, *dev = NULL;
1048         const char *delim = " ";
1049         struct sockaddr_in *ip;
1050         struct sockaddr_in si;
1051         struct addrinfo *res;
1052         struct process *p;
1053         int rc;
1054
1055         /* Note: IPv4 only */
1056         rc = inet_pton(AF_INET, url->host, &(si.sin_addr));
1057         if (rc > 0) {
1058                 ipaddr = url->host;
1059         } else {
1060                 /* need to turn hostname into a valid IP */
1061                 rc = getaddrinfo(url->host, NULL, NULL, &res);
1062                 if (rc) {
1063                         pb_debug("%s: Invalid URL\n",__func__);
1064                         return NULL;
1065                 }
1066                 ipaddr = talloc_array(ctx,char,INET_ADDRSTRLEN);
1067                 ip = (struct sockaddr_in *) res->ai_addr;
1068                 inet_ntop(AF_INET, &(ip->sin_addr), ipaddr, INET_ADDRSTRLEN);
1069                 freeaddrinfo(res);
1070         }
1071
1072         const char *argv[] = {
1073                 pb_system_apps.ip,
1074                 "route", "show", "to", "match",
1075                 ipaddr,
1076                 NULL
1077         };
1078
1079         p = process_create(ctx);
1080
1081         p->path = pb_system_apps.ip;
1082         p->argv = argv;
1083         p->keep_stdout = true;
1084
1085         rc = process_run_sync(p);
1086
1087         if (rc || p->exit_status) {
1088                 /* ip has complained for some reason; most likely
1089                  * there is no route to the host - bail out */
1090                 pb_debug("%s: `ip` returns non-zero exit status\n", __func__);
1091                 pb_debug("ip buf: %s\n", p->stdout_buf);
1092                 process_release(p);
1093                 return NULL;
1094         }
1095
1096         buf = p->stdout_buf;
1097         /* If a route is found, ip-route output will be of the form
1098          * "... dev DEVNAME ... " */
1099         tok = strtok(buf, delim);
1100         while (tok) {
1101                 if (!strcmp(tok, "dev")) {
1102                         tok = strtok(NULL, delim);
1103                         dev = talloc_strdup(ctx, tok);
1104                         break;
1105                 }
1106                 tok = strtok(NULL, delim);
1107         }
1108
1109         process_release(p);
1110         if (dev)
1111                 pb_debug("%s: Found interface '%s'\n", __func__,dev);
1112         return dev;
1113 }
1114
1115 void device_handler_process_url(struct device_handler *handler,
1116                 const char *url, const char *mac, const char *ip)
1117 {
1118         struct discover_context *ctx;
1119         struct discover_device *dev;
1120         struct pb_url *pb_url;
1121         struct event *event;
1122         struct param *param;
1123
1124         if (!handler->network) {
1125                 device_handler_status_err(handler, _("No network configured"));
1126                 return;
1127         }
1128
1129         event = talloc(handler, struct event);
1130         event->type = EVENT_TYPE_USER;
1131         event->action = EVENT_ACTION_URL;
1132
1133         if (url[strlen(url) - 1] == '/') {
1134                 event->params = talloc_array(event, struct param, 3);
1135                 param = &event->params[0];
1136                 param->name = talloc_strdup(event, "pxepathprefix");
1137                 param->value = talloc_strdup(event, url);
1138                 param = &event->params[1];
1139                 param->name = talloc_strdup(event, "mac");
1140                 param->value = talloc_strdup(event, mac);
1141                 param = &event->params[2];
1142                 param->name = talloc_strdup(event, "ip");
1143                 param->value = talloc_strdup(event, ip);
1144                 event->n_params = 3;
1145         } else {
1146                 event->params = talloc_array(event, struct param, 1);
1147                 param = &event->params[0];
1148                 param->name = talloc_strdup(event, "pxeconffile");
1149                 param->value = talloc_strdup(event, url);
1150                 event->n_params = 1;
1151         }
1152
1153         pb_url = pb_url_parse(event, event->params->value);
1154         if (!pb_url || (pb_url->scheme != pb_url_file && !pb_url->host)) {
1155                 device_handler_status_err(handler, _("Invalid config URL!"));
1156                 return;
1157         }
1158
1159         if (pb_url->scheme == pb_url_file)
1160                 event->device = talloc_asprintf(event, "local");
1161         else
1162                 event->device = device_from_addr(event, pb_url);
1163
1164         if (!event->device) {
1165                 device_handler_status_err(handler,
1166                                         _("Unable to route to host %s"),
1167                                         pb_url->host);
1168                 return;
1169         }
1170
1171         dev = discover_device_create(handler, mac, event->device);
1172         if (pb_url->scheme == pb_url_file)
1173                 dev->device->type = DEVICE_TYPE_ANY;
1174         ctx = device_handler_discover_context_create(handler, dev);
1175         talloc_steal(ctx, event);
1176         ctx->event = event;
1177
1178         iterate_parsers(ctx);
1179
1180         device_handler_discover_context_commit(handler, ctx);
1181
1182         talloc_unlink(handler, ctx);
1183 }
1184
1185 #ifndef PETITBOOT_TEST
1186
1187 /**
1188  * context_commit - Commit a temporary discovery context to the handler,
1189  * and notify the clients about any new options / devices
1190  */
1191 void device_handler_discover_context_commit(struct device_handler *handler,
1192                 struct discover_context *ctx)
1193 {
1194         struct discover_device *dev = ctx->device;
1195         struct discover_boot_option *opt, *tmp;
1196
1197         if (!device_lookup_by_uuid(handler, dev->uuid))
1198                 device_handler_add_device(handler, dev);
1199
1200         /* move boot options from the context to the device */
1201         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
1202                 list_remove(&opt->list);
1203
1204                 /* All boot options need at least a kernel image */
1205                 if (!opt->boot_image || !opt->boot_image->url) {
1206                         pb_log("boot option %s is missing boot image, ignoring\n",
1207                                 opt->option->id);
1208                         talloc_free(opt);
1209                         continue;
1210                 }
1211
1212                 if (boot_option_resolve(opt, handler)) {
1213                         pb_log("boot option %s is resolved, "
1214                                         "sending to clients\n",
1215                                         opt->option->id);
1216                         list_add_tail(&dev->boot_options, &opt->list);
1217                         talloc_steal(dev, opt);
1218                         boot_option_finalise(handler, opt);
1219                         notify_boot_option(handler, opt);
1220                 } else {
1221                         if (!opt->source->resolve_resource) {
1222                                 pb_log("parser %s gave us an unresolved "
1223                                         "resource (%s), but no way to "
1224                                         "resolve it\n",
1225                                         opt->source->name, opt->option->id);
1226                                 talloc_free(opt);
1227                         } else {
1228                                 pb_log("boot option %s is unresolved, "
1229                                                 "adding to queue\n",
1230                                                 opt->option->id);
1231                                 list_add(&handler->unresolved_boot_options,
1232                                                 &opt->list);
1233                                 talloc_steal(handler, opt);
1234                         }
1235                 }
1236         }
1237 }
1238
1239 static void device_handler_update_lang(const char *lang)
1240 {
1241         const char *cur_lang;
1242
1243         if (!lang)
1244                 return;
1245
1246         cur_lang = setlocale(LC_ALL, NULL);
1247         if (cur_lang && !strcmp(cur_lang, lang))
1248                 return;
1249
1250         setlocale(LC_ALL, lang);
1251 }
1252
1253 static int device_handler_init_sources(struct device_handler *handler)
1254 {
1255         /* init our device sources: udev, network and user events */
1256         handler->udev = udev_init(handler, handler->waitset);
1257         if (!handler->udev)
1258                 return -1;
1259
1260         handler->network = network_init(handler, handler->waitset,
1261                         handler->dry_run);
1262         if (!handler->network)
1263                 return -1;
1264
1265         handler->user_event = user_event_init(handler, handler->waitset);
1266         if (!handler->user_event)
1267                 return -1;
1268
1269         return 0;
1270 }
1271
1272 static void device_handler_reinit_sources(struct device_handler *handler)
1273 {
1274         /* if we haven't initialised sources previously (becuase we started in
1275          * safe mode), then init once here. */
1276         if (!(handler->udev || handler->network || handler->user_event)) {
1277                 device_handler_init_sources(handler);
1278                 return;
1279         }
1280
1281         udev_reinit(handler->udev);
1282
1283         network_shutdown(handler->network);
1284         handler->network = network_init(handler, handler->waitset,
1285                         handler->dry_run);
1286 }
1287
1288 static inline const char *get_device_path(struct discover_device *dev)
1289 {
1290         return dev->ramdisk ? dev->ramdisk->snapshot : dev->device_path;
1291 }
1292
1293 static char *check_subvols(struct discover_device *dev)
1294 {
1295         const char *fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1296         struct stat sb;
1297         char *path;
1298         int rc;
1299
1300         if (strncmp(fstype, "btrfs", strlen("btrfs")))
1301                 return dev->mount_path;
1302
1303         /* On btrfs a device's root may be under a subvolume path */
1304         path = join_paths(dev, dev->mount_path, "@");
1305         rc = stat(path, &sb);
1306         if (!rc && S_ISDIR(sb.st_mode)) {
1307                 pb_debug("Using '%s' for btrfs root path\n", path);
1308                 return path;
1309         }
1310
1311         talloc_free(path);
1312         return dev->mount_path;
1313 }
1314
1315 static bool check_existing_mount(struct discover_device *dev)
1316 {
1317         struct stat devstat, mntstat;
1318         const char *device_path;
1319         struct mntent *mnt;
1320         FILE *fp;
1321         int rc;
1322
1323         device_path = get_device_path(dev);
1324
1325         rc = stat(device_path, &devstat);
1326         if (rc) {
1327                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
1328                 return false;
1329         }
1330
1331         if (!S_ISBLK(devstat.st_mode)) {
1332                 pb_debug("%s: %s isn't a block device?\n", __func__,
1333                                 dev->device_path);
1334                 return false;
1335         }
1336
1337         fp = fopen("/proc/self/mounts", "r");
1338
1339         for (;;) {
1340                 mnt = getmntent(fp);
1341                 if (!mnt)
1342                         break;
1343
1344                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
1345                         continue;
1346
1347                 rc = stat(mnt->mnt_fsname, &mntstat);
1348                 if (rc)
1349                         continue;
1350
1351                 if (!S_ISBLK(mntstat.st_mode))
1352                         continue;
1353
1354                 if (mntstat.st_rdev == devstat.st_rdev) {
1355                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
1356                         dev->root_path = check_subvols(dev);
1357                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
1358                         dev->mounted = true;
1359                         dev->unmount = false;
1360
1361                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
1362                                         __func__, dev->device_path,
1363                                         dev->mounted_rw ? 'w' : 'o',
1364                                         mnt->mnt_dir);
1365                         break;
1366                 }
1367         }
1368
1369         fclose(fp);
1370
1371         return mnt != NULL;
1372 }
1373
1374 /*
1375  * Attempt to mount a filesystem safely, while handling certain filesytem-
1376  * specific options
1377  */
1378 static int try_mount(const char *device_path, const char *mount_path,
1379                              const char *fstype, unsigned long flags,
1380                              bool have_snapshot)
1381 {
1382         const char *fs, *safe_opts;
1383         int rc;
1384
1385         /* Mount ext3 as ext4 instead so 'norecovery' can be used */
1386         if (strncmp(fstype, "ext3", strlen("ext3")) == 0) {
1387                 pb_debug("Mounting ext3 filesystem as ext4\n");
1388                 fs = "ext4";
1389         } else
1390                 fs = fstype;
1391
1392         if (strncmp(fs, "xfs", strlen("xfs")) == 0 ||
1393             strncmp(fs, "ext4", strlen("ext4")) == 0)
1394                 safe_opts = "norecovery";
1395         else
1396                 safe_opts = NULL;
1397
1398         errno = 0;
1399         /* If no snapshot is available don't attempt recovery */
1400         if (!have_snapshot)
1401                 return mount(device_path, mount_path, fs, flags, safe_opts);
1402
1403         rc = mount(device_path, mount_path, fs, flags, NULL);
1404
1405         if (!rc)
1406                 return rc;
1407
1408         /* Mounting failed; some filesystems will fail to mount if a recovery
1409          * journal exists (eg. cross-endian XFS), so try again with norecovery
1410          * where that option is available.
1411          * If mounting read-write just return the error as norecovery is not a
1412          * valid option */
1413         if ((flags & MS_RDONLY) != MS_RDONLY || !safe_opts)
1414                 return rc;
1415
1416         errno = 0;
1417         return mount(device_path, mount_path, fs, flags, safe_opts);
1418 }
1419
1420 static int mount_device(struct discover_device *dev)
1421 {
1422         const char *fstype, *device_path;
1423         int rc;
1424
1425         if (!dev->device_path)
1426                 return -1;
1427
1428         if (dev->mounted)
1429                 return 0;
1430
1431         if (check_existing_mount(dev))
1432                 return 0;
1433
1434         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1435         if (!fstype)
1436                 return 0;
1437
1438         dev->mount_path = join_paths(dev, mount_base(),
1439                                         dev->device_path);
1440
1441         if (pb_mkdir_recursive(dev->mount_path)) {
1442                 pb_log("couldn't create mount directory %s: %s\n",
1443                                 dev->mount_path, strerror(errno));
1444                 goto err_free;
1445         }
1446
1447         device_path = get_device_path(dev);
1448
1449         pb_log("mounting device %s read-only\n", dev->device_path);
1450         rc = try_mount(device_path, dev->mount_path, fstype,
1451                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1452
1453         if (!rc) {
1454                 dev->mounted = true;
1455                 dev->mounted_rw = false;
1456                 dev->unmount = true;
1457                 dev->root_path = check_subvols(dev);
1458                 return 0;
1459         }
1460
1461         pb_log("couldn't mount device %s: mount failed: %s\n",
1462                         device_path, strerror(errno));
1463
1464         /* If mount fails clean up any snapshot */
1465         devmapper_destroy_snapshot(dev);
1466
1467         pb_rmdir_recursive(mount_base(), dev->mount_path);
1468 err_free:
1469         talloc_free(dev->mount_path);
1470         dev->mount_path = NULL;
1471         return -1;
1472 }
1473
1474 static int umount_device(struct discover_device *dev)
1475 {
1476         const char *device_path;
1477         int rc;
1478
1479         if (!dev->mounted || !dev->unmount)
1480                 return 0;
1481
1482         device_path = get_device_path(dev);
1483
1484         pb_log("unmounting device %s\n", device_path);
1485         rc = umount(dev->mount_path);
1486         if (rc)
1487                 return -1;
1488
1489         dev->mounted = false;
1490         devmapper_destroy_snapshot(dev);
1491
1492         pb_rmdir_recursive(mount_base(), dev->mount_path);
1493
1494         talloc_free(dev->mount_path);
1495         dev->mount_path = NULL;
1496         dev->root_path = NULL;
1497
1498         return 0;
1499 }
1500
1501 int device_request_write(struct discover_device *dev, bool *release)
1502 {
1503         const char *fstype, *device_path;
1504         const struct config *config;
1505         int rc;
1506
1507         *release = false;
1508
1509         config = config_get();
1510         if (!config->allow_writes)
1511                 return -1;
1512
1513         if (!dev->mounted)
1514                 return -1;
1515
1516         if (dev->mounted_rw)
1517                 return 0;
1518
1519         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1520
1521         device_path = get_device_path(dev);
1522
1523         pb_log("remounting device %s read-write\n", device_path);
1524
1525         rc = umount(dev->mount_path);
1526         if (rc) {
1527                 pb_log("Failed to unmount %s: %s\n",
1528                        dev->mount_path, strerror(errno));
1529                 return -1;
1530         }
1531
1532         rc = try_mount(device_path, dev->mount_path, fstype,
1533                        MS_SILENT, dev->ramdisk);
1534         if (rc)
1535                 goto mount_ro;
1536
1537         dev->mounted_rw = true;
1538         *release = true;
1539         return 0;
1540
1541 mount_ro:
1542         pb_log("Unable to remount device %s read-write: %s\n",
1543                device_path, strerror(errno));
1544         rc = try_mount(device_path, dev->mount_path, fstype,
1545                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1546         if (rc)
1547                 pb_log("Unable to recover mount for %s: %s\n",
1548                        device_path, strerror(errno));
1549         return -1;
1550 }
1551
1552 void device_release_write(struct discover_device *dev, bool release)
1553 {
1554         const char *fstype, *device_path;
1555
1556         if (!release)
1557                 return;
1558
1559         device_path = get_device_path(dev);
1560
1561         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1562
1563         pb_log("remounting device %s read-only\n", device_path);
1564
1565         if (umount(dev->mount_path)) {
1566                 pb_log("Failed to unmount %s\n", dev->mount_path);
1567                 return;
1568         }
1569         dev->mounted_rw = dev->mounted = false;
1570
1571         if (dev->ramdisk) {
1572                 devmapper_merge_snapshot(dev);
1573                 /* device_path becomes stale after merge */
1574                 device_path = get_device_path(dev);
1575         }
1576
1577         if (try_mount(device_path, dev->mount_path, fstype,
1578                        MS_RDONLY | MS_SILENT, dev->ramdisk))
1579                 pb_log("Failed to remount %s read-only: %s\n",
1580                        device_path, strerror(errno));
1581         else
1582                 dev->mounted = true;
1583 }
1584
1585 void device_sync_snapshots(struct device_handler *handler, const char *device)
1586 {
1587         struct discover_device *dev = NULL;
1588         unsigned int i;
1589
1590         if (device) {
1591                 /* Find matching device and sync */
1592                 dev = device_lookup_by_name(handler, device);
1593                 if (!dev) {
1594                         pb_log("%s: device name '%s' unrecognised\n",
1595                                 __func__, device);
1596                         return;
1597                 }
1598                 if (dev->ramdisk)
1599                         device_release_write(dev, true);
1600                 else
1601                         pb_log("%s has no snapshot to merge, skipping\n",
1602                                 dev->device->id);
1603                 return;
1604         }
1605
1606         /* Otherwise sync all relevant devices */
1607         for (i = 0; i < handler->n_devices; i++) {
1608                 dev = handler->devices[i];
1609                 if (dev->device->type != DEVICE_TYPE_DISK &&
1610                         dev->device->type != DEVICE_TYPE_USB)
1611                         continue;
1612                 if (dev->ramdisk)
1613                         device_release_write(dev, true);
1614                 else
1615                         pb_log("%s has no snapshot to merge, skipping\n",
1616                                 dev->device->id);
1617         }
1618 }
1619
1620 #else
1621
1622 void device_handler_discover_context_commit(
1623                 struct device_handler *handler __attribute__((unused)),
1624                 struct discover_context *ctx __attribute__((unused)))
1625 {
1626         pb_log("%s stubbed out for test cases\n", __func__);
1627 }
1628
1629 static void device_handler_update_lang(const char *lang __attribute__((unused)))
1630 {
1631 }
1632
1633 static int device_handler_init_sources(
1634                 struct device_handler *handler __attribute__((unused)))
1635 {
1636         return 0;
1637 }
1638
1639 static void device_handler_reinit_sources(
1640                 struct device_handler *handler __attribute__((unused)))
1641 {
1642 }
1643
1644 static int umount_device(struct discover_device *dev __attribute__((unused)))
1645 {
1646         return 0;
1647 }
1648
1649 static int __attribute__((unused)) mount_device(
1650                 struct discover_device *dev __attribute__((unused)))
1651 {
1652         return 0;
1653 }
1654
1655 int device_request_write(struct discover_device *dev __attribute__((unused)),
1656                 bool *release)
1657 {
1658         *release = true;
1659         return 0;
1660 }
1661
1662 void device_release_write(struct discover_device *dev __attribute__((unused)),
1663         bool release __attribute__((unused)))
1664 {
1665 }
1666
1667 void device_sync_snapshots(
1668                 struct device_handler *handler __attribute__((unused)),
1669                 const char *device __attribute__((unused)))
1670 {
1671 }
1672
1673 #endif