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 <sys/stat.h>
   9 #include <sys/wait.h>
  10
  11 #include <talloc/talloc.h>
  12 #include <list/list.h>
  13 #include <log/log.h>
  14 #include <types/types.h>
  15 #include <system/system.h>
  16 #include <process/process.h>
  17 #include <url/url.h>
  18
  19 #include "device-handler.h"
  20 #include "discover-server.h"
  21 #include "platform.h"
  22 #include "event.h"
  23 #include "parser.h"
  24 #include "resource.h"
  25 #include "paths.h"
  26 #include "sysinfo.h"
  27 #include "boot.h"
  28
  29 struct device_handler {
  30         struct discover_server  *server;
  31         int                     dry_run;
  32
  33         struct discover_device  **devices;
  34         unsigned int            n_devices;
  35
  36         struct waitset          *waitset;
  37         struct waiter           *timeout_waiter;
  38         bool                    autoboot_enabled;
  39         unsigned int            sec_to_boot;
  40
  41         struct discover_boot_option *default_boot_option;
  42         struct list             unresolved_boot_options;
  43
  44         struct boot_task        *pending_boot;
  45         bool                    pending_boot_is_default;
  46 };
  47
  48 static int mount_device(struct discover_device *dev);
  49 static int umount_device(struct discover_device *dev);
  50
  51 void discover_context_add_boot_option(struct discover_context *ctx,
  52                 struct discover_boot_option *boot_option)
  53 {
  54         boot_option->source = ctx->parser;
  55         list_add_tail(&ctx->boot_options, &boot_option->list);
  56         talloc_steal(ctx, boot_option);
  57 }
  58
  59 /**
  60  * device_handler_get_device_count - Get the count of current handler devices.
  61  */
  62
  63 int device_handler_get_device_count(const struct device_handler *handler)
  64 {
  65         return handler->n_devices;
  66 }
  67
  68 /**
  69  * device_handler_get_device - Get a handler device by index.
  70  */
  71
  72 const struct discover_device *device_handler_get_device(
  73         const struct device_handler *handler, unsigned int index)
  74 {
  75         if (index >= handler->n_devices) {
  76                 assert(0 && "bad index");
  77                 return NULL;
  78         }
  79
  80         return handler->devices[index];
  81 }
  82
  83 struct discover_boot_option *discover_boot_option_create(
  84                 struct discover_context *ctx,
  85                 struct discover_device *device)
  86 {
  87         struct discover_boot_option *opt;
  88
  89         opt = talloc_zero(ctx, struct discover_boot_option);
  90         opt->option = talloc_zero(opt, struct boot_option);
  91         opt->device = device;
  92
  93         return opt;
  94 }
  95
  96 static int device_match_uuid(struct discover_device *dev, const char *uuid)
  97 {
  98         return dev->uuid && !strcmp(dev->uuid, uuid);
  99 }
 100
 101 static int device_match_label(struct discover_device *dev, const char *label)
 102 {
 103         return dev->label && !strcmp(dev->label, label);
 104 }
 105
 106 static int device_match_id(struct discover_device *dev, const char *id)
 107 {
 108         return !strcmp(dev->device->id, id);
 109 }
 110
 111 static int device_match_serial(struct discover_device *dev, const char *serial)
 112 {
 113         const char *val = discover_device_get_param(dev, "ID_SERIAL");
 114         return val && !strcmp(val, serial);
 115 }
 116
 117 static struct discover_device *device_lookup(
 118                 struct device_handler *device_handler,
 119                 int (match_fn)(struct discover_device *, const char *),
 120                 const char *str)
 121 {
 122         struct discover_device *dev;
 123         unsigned int i;
 124
 125         if (!str)
 126                 return NULL;
 127
 128         for (i = 0; i < device_handler->n_devices; i++) {
 129                 dev = device_handler->devices[i];
 130
 131                 if (match_fn(dev, str))
 132                         return dev;
 133         }
 134
 135         return NULL;
 136 }
 137
 138 struct discover_device *device_lookup_by_name(struct device_handler *handler,
 139                 const char *name)
 140 {
 141         if (!strncmp(name, "/dev/", strlen("/dev/")))
 142                 name += strlen("/dev/");
 143
 144         return device_lookup_by_id(handler, name);
 145 }
 146
 147 struct discover_device *device_lookup_by_uuid(
 148                 struct device_handler *device_handler,
 149                 const char *uuid)
 150 {
 151         return device_lookup(device_handler, device_match_uuid, uuid);
 152 }
 153
 154 struct discover_device *device_lookup_by_label(
 155                 struct device_handler *device_handler,
 156                 const char *label)
 157 {
 158         return device_lookup(device_handler, device_match_label, label);
 159 }
 160
 161 struct discover_device *device_lookup_by_id(
 162                 struct device_handler *device_handler,
 163                 const char *id)
 164 {
 165         return device_lookup(device_handler, device_match_id, id);
 166 }
 167
 168 struct discover_device *device_lookup_by_serial(
 169                 struct device_handler *device_handler,
 170                 const char *serial)
 171 {
 172         return device_lookup(device_handler, device_match_serial, serial);
 173 }
 174
 175 void device_handler_destroy(struct device_handler *handler)
 176 {
 177         talloc_free(handler);
 178 }
 179
 180 static int destroy_device(void *arg)
 181 {
 182         struct discover_device *dev = arg;
 183
 184         umount_device(dev);
 185
 186         return 0;
 187 }
 188
 189 struct discover_device *discover_device_create(struct device_handler *handler,
 190                 const char *id)
 191 {
 192         struct discover_device *dev;
 193
 194         dev = device_lookup_by_id(handler, id);
 195         if (dev)
 196                 return dev;
 197
 198         dev = talloc_zero(handler, struct discover_device);
 199         dev->device = talloc_zero(dev, struct device);
 200         dev->device->id = talloc_strdup(dev->device, id);
 201         list_init(&dev->params);
 202         list_init(&dev->boot_options);
 203
 204         talloc_set_destructor(dev, destroy_device);
 205
 206         return dev;
 207 }
 208
 209 struct discover_device_param {
 210         char                    *name;
 211         char                    *value;
 212         struct list_item        list;
 213 };
 214
 215 void discover_device_set_param(struct discover_device *device,
 216                 const char *name, const char *value)
 217 {
 218         struct discover_device_param *param;
 219         bool found = false;
 220
 221         list_for_each_entry(&device->params, param, list) {
 222                 if (!strcmp(param->name, name)) {
 223                         found = true;
 224                         break;
 225                 }
 226         }
 227
 228         if (!found) {
 229                 if (!value)
 230                         return;
 231                 param = talloc(device, struct discover_device_param);
 232                 param->name = talloc_strdup(param, name);
 233                 list_add(&device->params, &param->list);
 234         } else {
 235                 if (!value) {
 236                         list_remove(&param->list);
 237                         talloc_free(param);
 238                         return;
 239                 }
 240                 talloc_free(param->value);
 241         }
 242
 243         param->value = talloc_strdup(param, value);
 244 }
 245
 246 const char *discover_device_get_param(struct discover_device *device,
 247                 const char *name)
 248 {
 249         struct discover_device_param *param;
 250
 251         list_for_each_entry(&device->params, param, list) {
 252                 if (!strcmp(param->name, name))
 253                         return param->name;
 254         }
 255         return NULL;
 256 }
 257
 258 struct device_handler *device_handler_init(struct discover_server *server,
 259                 struct waitset *waitset, int dry_run)
 260 {
 261         struct device_handler *handler;
 262
 263         handler = talloc_zero(NULL, struct device_handler);
 264         handler->server = server;
 265         handler->waitset = waitset;
 266         handler->dry_run = dry_run;
 267         handler->autoboot_enabled = config_get()->autoboot_enabled;
 268
 269         list_init(&handler->unresolved_boot_options);
 270
 271         /* set up our mount point base */
 272         pb_mkdir_recursive(mount_base());
 273
 274         parser_init();
 275
 276         return handler;
 277 }
 278
 279 void device_handler_remove(struct device_handler *handler,
 280                 struct discover_device *device)
 281 {
 282         struct discover_boot_option *opt, *tmp;
 283         unsigned int i;
 284
 285         for (i = 0; i < handler->n_devices; i++)
 286                 if (handler->devices[i] == device)
 287                         break;
 288
 289         if (i == handler->n_devices) {
 290                 talloc_free(device);
 291                 return;
 292         }
 293
 294         /* Free any unresolved options, as they're currently allocated
 295          * against the handler */
 296         list_for_each_entry_safe(&handler->unresolved_boot_options,
 297                         opt, tmp, list) {
 298                 if (opt->device != device)
 299                         continue;
 300                 list_remove(&opt->list);
 301                 talloc_free(opt);
 302         }
 303
 304         handler->n_devices--;
 305         memmove(&handler->devices[i], &handler->devices[i + 1],
 306                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 307         handler->devices = talloc_realloc(handler, handler->devices,
 308                 struct discover_device *, handler->n_devices);
 309
 310         if (device->notified)
 311                 discover_server_notify_device_remove(handler->server,
 312                                                         device->device);
 313
 314         talloc_free(device);
 315 }
 316
 317 static void boot_status(void *arg, struct boot_status *status)
 318 {
 319         struct device_handler *handler = arg;
 320
 321         discover_server_notify_boot_status(handler->server, status);
 322 }
 323
 324 static void countdown_status(struct device_handler *handler,
 325                 struct discover_boot_option *opt, unsigned int sec)
 326 {
 327         struct boot_status status;
 328
 329         status.type = BOOT_STATUS_INFO;
 330         status.progress = -1;
 331         status.detail = NULL;
 332         status.message = talloc_asprintf(handler,
 333                         "Booting %s in %u sec", opt->option->name, sec);
 334
 335         discover_server_notify_boot_status(handler->server, &status);
 336
 337         talloc_free(status.message);
 338 }
 339
 340 static int default_timeout(void *arg)
 341 {
 342         struct device_handler *handler = arg;
 343         struct discover_boot_option *opt;
 344
 345         if (!handler->default_boot_option)
 346                 return 0;
 347
 348         if (handler->pending_boot)
 349                 return 0;
 350
 351         opt = handler->default_boot_option;
 352
 353         if (handler->sec_to_boot) {
 354                 countdown_status(handler, opt, handler->sec_to_boot);
 355                 handler->sec_to_boot--;
 356                 handler->timeout_waiter = waiter_register_timeout(
 357                                                 handler->waitset, 1000,
 358                                                 default_timeout, handler);
 359                 return 0;
 360         }
 361
 362         handler->timeout_waiter = NULL;
 363
 364         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 365
 366         handler->pending_boot = boot(handler, handler->default_boot_option,
 367                         NULL, handler->dry_run, boot_status, handler);
 368         handler->pending_boot_is_default = true;
 369         return 0;
 370 }
 371
 372 static bool priority_match(struct boot_priority *prio,
 373                 struct discover_boot_option *opt)
 374 {
 375         return prio->type == opt->device->device->type;
 376 }
 377
 378 static int default_option_priority(struct discover_boot_option *opt)
 379 {
 380         const struct config *config;
 381         struct boot_priority *prio;
 382         unsigned int i;
 383
 384         config = config_get();
 385
 386         for (i = 0; i < config->n_boot_priorities; i++) {
 387                 prio = &config->boot_priorities[i];
 388                 if (priority_match(prio, opt))
 389                         return prio->priority;
 390         }
 391
 392         return 0;
 393 }
 394
 395 static void set_default(struct device_handler *handler,
 396                 struct discover_boot_option *opt)
 397 {
 398         int new_prio;
 399
 400         if (!handler->autoboot_enabled)
 401                 return;
 402
 403         new_prio = default_option_priority(opt);
 404
 405         /* A negative priority indicates that we don't want to boot this device
 406          * by default */
 407         if (new_prio < 0)
 408                 return;
 409
 410         /* Resolve any conflicts: if we have a new default option, it only
 411          * replaces the current if it has a higher priority. */
 412         if (handler->default_boot_option) {
 413                 int cur_prio;
 414
 415                 cur_prio = default_option_priority(
 416                                         handler->default_boot_option);
 417
 418                 if (new_prio > cur_prio) {
 419                         handler->default_boot_option = opt;
 420                         /* extend the timeout a little, so the user sees some
 421                          * indication of the change */
 422                         handler->sec_to_boot += 2;
 423                 }
 424
 425                 return;
 426         }
 427
 428         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 429         handler->default_boot_option = opt;
 430
 431         pb_log("Boot option %s set as default, timeout %u sec.\n",
 432                opt->option->id, handler->sec_to_boot);
 433
 434         default_timeout(handler);
 435 }
 436
 437 static bool resource_is_resolved(struct resource *res)
 438 {
 439         return !res || res->resolved;
 440 }
 441
 442 /* We only use this in an assert, which will disappear if we're compiling
 443  * with NDEBUG, so we need the 'used' attribute for these builds */
 444 static bool __attribute__((used)) boot_option_is_resolved(
 445                 struct discover_boot_option *opt)
 446 {
 447         return resource_is_resolved(opt->boot_image) &&
 448                 resource_is_resolved(opt->initrd) &&
 449                 resource_is_resolved(opt->dtb) &&
 450                 resource_is_resolved(opt->icon);
 451 }
 452
 453 static bool resource_resolve(struct resource *res, const char *name,
 454                 struct discover_boot_option *opt,
 455                 struct device_handler *handler)
 456 {
 457         struct parser *parser = opt->source;
 458
 459         if (resource_is_resolved(res))
 460                 return true;
 461
 462         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
 463                         opt->option->id, name, parser->name);
 464         parser->resolve_resource(handler, res);
 465
 466         return res->resolved;
 467 }
 468
 469 static bool boot_option_resolve(struct discover_boot_option *opt,
 470                 struct device_handler *handler)
 471 {
 472         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 473                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 474                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 475                 resource_resolve(opt->icon, "icon", opt, handler);
 476 }
 477
 478 static void boot_option_finalise(struct device_handler *handler,
 479                 struct discover_boot_option *opt)
 480 {
 481         assert(boot_option_is_resolved(opt));
 482
 483         /* check that the parsers haven't set any of the final data */
 484         assert(!opt->option->boot_image_file);
 485         assert(!opt->option->initrd_file);
 486         assert(!opt->option->dtb_file);
 487         assert(!opt->option->icon_file);
 488         assert(!opt->option->device_id);
 489
 490         if (opt->boot_image)
 491                 opt->option->boot_image_file = opt->boot_image->url->full;
 492         if (opt->initrd)
 493                 opt->option->initrd_file = opt->initrd->url->full;
 494         if (opt->dtb)
 495                 opt->option->dtb_file = opt->dtb->url->full;
 496         if (opt->icon)
 497                 opt->option->icon_file = opt->icon->url->full;
 498
 499         opt->option->device_id = opt->device->device->id;
 500
 501         if (opt->option->is_default)
 502                 set_default(handler, opt);
 503 }
 504
 505 static void notify_boot_option(struct device_handler *handler,
 506                 struct discover_boot_option *opt)
 507 {
 508         struct discover_device *dev = opt->device;
 509
 510         if (!dev->notified)
 511                 discover_server_notify_device_add(handler->server,
 512                                                   opt->device->device);
 513         dev->notified = true;
 514         discover_server_notify_boot_option_add(handler->server, opt->option);
 515 }
 516
 517 static void process_boot_option_queue(struct device_handler *handler)
 518 {
 519         struct discover_boot_option *opt, *tmp;
 520
 521         list_for_each_entry_safe(&handler->unresolved_boot_options,
 522                         opt, tmp, list) {
 523
 524                 pb_debug("queue: attempting resolution for %s\n",
 525                                 opt->option->id);
 526
 527                 if (!boot_option_resolve(opt, handler))
 528                         continue;
 529
 530                 pb_debug("\tresolved!\n");
 531
 532                 list_remove(&opt->list);
 533                 list_add_tail(&opt->device->boot_options, &opt->list);
 534                 talloc_steal(opt->device, opt);
 535                 boot_option_finalise(handler, opt);
 536                 notify_boot_option(handler, opt);
 537         }
 538 }
 539
 540 struct discover_context *device_handler_discover_context_create(
 541                 struct device_handler *handler,
 542                 struct discover_device *device)
 543 {
 544         struct discover_context *ctx;
 545
 546         ctx = talloc_zero(handler, struct discover_context);
 547         ctx->device = device;
 548         list_init(&ctx->boot_options);
 549
 550         return ctx;
 551 }
 552
 553 /**
 554  * context_commit - Commit a temporary discovery context to the handler,
 555  * and notify the clients about any new options / devices
 556  */
 557 void device_handler_discover_context_commit(struct device_handler *handler,
 558                 struct discover_context *ctx)
 559 {
 560         struct discover_device *dev = ctx->device;
 561         struct discover_boot_option *opt, *tmp;
 562
 563         if (!device_lookup_by_id(handler, dev->device->id))
 564                 device_handler_add_device(handler, dev);
 565
 566         /* move boot options from the context to the device */
 567         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
 568                 list_remove(&opt->list);
 569
 570                 if (boot_option_resolve(opt, handler)) {
 571                         pb_log("boot option %s is resolved, "
 572                                         "sending to clients\n",
 573                                         opt->option->id);
 574                         list_add_tail(&dev->boot_options, &opt->list);
 575                         talloc_steal(dev, opt);
 576                         boot_option_finalise(handler, opt);
 577                         notify_boot_option(handler, opt);
 578                 } else {
 579                         if (!opt->source->resolve_resource) {
 580                                 pb_log("parser %s gave us an unresolved "
 581                                         "resource (%s), but no way to "
 582                                         "resolve it\n",
 583                                         opt->source->name, opt->option->id);
 584                                 talloc_free(opt);
 585                         } else {
 586                                 pb_log("boot option %s is unresolved, "
 587                                                 "adding to queue\n",
 588                                                 opt->option->id);
 589                                 list_add(&handler->unresolved_boot_options,
 590                                                 &opt->list);
 591                                 talloc_steal(handler, opt);
 592                         }
 593                 }
 594         }
 595 }
 596
 597 void device_handler_add_device(struct device_handler *handler,
 598                 struct discover_device *device)
 599 {
 600         handler->n_devices++;
 601         handler->devices = talloc_realloc(handler, handler->devices,
 602                                 struct discover_device *, handler->n_devices);
 603         handler->devices[handler->n_devices - 1] = device;
 604
 605 }
 606
 607 /* Start discovery on a hotplugged device. The device will be in our devices
 608  * array, but has only just been initialised by the hotplug source.
 609  */
 610 int device_handler_discover(struct device_handler *handler,
 611                 struct discover_device *dev)
 612 {
 613         struct discover_context *ctx;
 614         int rc;
 615
 616         process_boot_option_queue(handler);
 617
 618         /* create our context */
 619         ctx = device_handler_discover_context_create(handler, dev);
 620
 621         rc = mount_device(dev);
 622         if (rc)
 623                 goto out;
 624
 625         /* add this device to our system info */
 626         system_info_register_blockdev(dev->device->id, dev->uuid,
 627                         dev->mount_path);
 628
 629         /* run the parsers. This will populate the ctx's boot_option list. */
 630         iterate_parsers(ctx);
 631
 632         /* add discovered stuff to the handler */
 633         device_handler_discover_context_commit(handler, ctx);
 634
 635 out:
 636         talloc_free(ctx);
 637
 638         return 0;
 639 }
 640
 641 /* Incoming dhcp event */
 642 int device_handler_dhcp(struct device_handler *handler,
 643                 struct discover_device *dev, struct event *event)
 644 {
 645         struct discover_context *ctx;
 646
 647         /* create our context */
 648         ctx = device_handler_discover_context_create(handler, dev);
 649         ctx->event = event;
 650
 651         iterate_parsers(ctx);
 652
 653         device_handler_discover_context_commit(handler, ctx);
 654
 655         talloc_free(ctx);
 656
 657         return 0;
 658 }
 659
 660 /* incoming conf event */
 661 int device_handler_conf(struct device_handler *handler,
 662                 struct discover_device *dev, struct pb_url *url)
 663 {
 664         struct discover_context *ctx;
 665
 666         /* create our context */
 667         ctx = device_handler_discover_context_create(handler, dev);
 668         ctx->conf_url = url;
 669
 670         iterate_parsers(ctx);
 671
 672         device_handler_discover_context_commit(handler, ctx);
 673
 674         talloc_free(ctx);
 675
 676         return 0;
 677 }
 678
 679 static struct discover_boot_option *find_boot_option_by_id(
 680                 struct device_handler *handler, const char *id)
 681 {
 682         unsigned int i;
 683
 684         for (i = 0; i < handler->n_devices; i++) {
 685                 struct discover_device *dev = handler->devices[i];
 686                 struct discover_boot_option *opt;
 687
 688                 list_for_each_entry(&dev->boot_options, opt, list)
 689                         if (!strcmp(opt->option->id, id))
 690                                 return opt;
 691         }
 692
 693         return NULL;
 694 }
 695
 696 void device_handler_boot(struct device_handler *handler,
 697                 struct boot_command *cmd)
 698 {
 699         struct discover_boot_option *opt = NULL;
 700
 701         if (cmd->option_id && strlen(cmd->option_id))
 702                 opt = find_boot_option_by_id(handler, cmd->option_id);
 703
 704         if (handler->pending_boot)
 705                 boot_cancel(handler->pending_boot);
 706         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
 707                         boot_status, handler);
 708         handler->pending_boot_is_default = false;
 709 }
 710
 711 void device_handler_cancel_default(struct device_handler *handler)
 712 {
 713         struct boot_status status;
 714
 715         if (handler->timeout_waiter)
 716                 waiter_remove(handler->timeout_waiter);
 717
 718         handler->timeout_waiter = NULL;
 719         handler->autoboot_enabled = false;
 720
 721         /* we only send status if we had a default boot option queued */
 722         if (!handler->default_boot_option)
 723                 return;
 724
 725         pb_log("Cancelling default boot option\n");
 726
 727         if (handler->pending_boot && handler->pending_boot_is_default) {
 728                 boot_cancel(handler->pending_boot);
 729                 handler->pending_boot = NULL;
 730                 handler->pending_boot_is_default = false;
 731         }
 732
 733         handler->default_boot_option = NULL;
 734
 735         status.type = BOOT_STATUS_INFO;
 736         status.progress = -1;
 737         status.detail = NULL;
 738         status.message = "Default boot cancelled";
 739
 740         discover_server_notify_boot_status(handler->server, &status);
 741 }
 742
 743 void device_handler_update_config(struct device_handler *handler,
 744                 struct config *config)
 745 {
 746         config_set(config);
 747         discover_server_notify_config(handler->server, config);
 748 }
 749
 750 #ifndef PETITBOOT_TEST
 751 static bool check_existing_mount(struct discover_device *dev)
 752 {
 753         struct stat devstat, mntstat;
 754         struct mntent *mnt;
 755         FILE *fp;
 756         int rc;
 757
 758         rc = stat(dev->device_path, &devstat);
 759         if (rc) {
 760                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
 761                 return false;
 762         }
 763
 764         if (!S_ISBLK(devstat.st_mode)) {
 765                 pb_debug("%s: %s isn't a block device?\n", __func__,
 766                                 dev->device_path);
 767                 return false;
 768         }
 769
 770         fp = fopen("/proc/self/mounts", "r");
 771
 772         for (;;) {
 773                 mnt = getmntent(fp);
 774                 if (!mnt)
 775                         break;
 776
 777                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
 778                         continue;
 779
 780                 rc = stat(mnt->mnt_fsname, &mntstat);
 781                 if (rc)
 782                         continue;
 783
 784                 if (!S_ISBLK(mntstat.st_mode))
 785                         continue;
 786
 787                 if (mntstat.st_rdev == devstat.st_rdev) {
 788                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
 789                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
 790                         dev->mounted = true;
 791                         dev->unmount = false;
 792
 793                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
 794                                         __func__, dev->device_path,
 795                                         dev->mounted_rw ? 'w' : 'o',
 796                                         mnt->mnt_dir);
 797                         break;
 798                 }
 799         }
 800
 801         fclose(fp);
 802
 803         return mnt != NULL;
 804 }
 805
 806 static int mount_device(struct discover_device *dev)
 807 {
 808         int rc;
 809
 810         if (!dev->device_path)
 811                 return -1;
 812
 813         if (dev->mounted)
 814                 return 0;
 815
 816         if (check_existing_mount(dev))
 817                 return 0;
 818
 819         dev->mount_path = join_paths(dev, mount_base(),
 820                                         dev->device_path);
 821
 822         if (pb_mkdir_recursive(dev->mount_path)) {
 823                 pb_log("couldn't create mount directory %s: %s\n",
 824                                 dev->mount_path, strerror(errno));
 825                 goto err_free;
 826         }
 827
 828         rc = process_run_simple(dev, pb_system_apps.mount,
 829                         dev->device_path, dev->mount_path,
 830                         "-o", "ro", NULL);
 831         if (!rc) {
 832                 dev->mounted = true;
 833                 dev->mounted_rw = false;
 834                 dev->unmount = true;
 835                 return 0;
 836         }
 837
 838         /* Retry mount without ro option. */
 839         rc = process_run_simple(dev, pb_system_apps.mount,
 840                         dev->device_path, dev->mount_path, NULL);
 841
 842         if (!rc) {
 843                 dev->mounted = true;
 844                 dev->mounted_rw = true;
 845                 dev->unmount = true;
 846                 return 0;
 847         }
 848
 849         pb_rmdir_recursive(mount_base(), dev->mount_path);
 850 err_free:
 851         talloc_free(dev->mount_path);
 852         dev->mount_path = NULL;
 853         return -1;
 854 }
 855
 856 static int umount_device(struct discover_device *dev)
 857 {
 858         int status;
 859
 860         if (!dev->mounted || !dev->unmount)
 861                 return 0;
 862
 863         status = process_run_simple(dev, pb_system_apps.umount,
 864                         dev->mount_path, NULL);
 865
 866         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 867                 return -1;
 868
 869         dev->mounted = false;
 870
 871         pb_rmdir_recursive(mount_base(), dev->mount_path);
 872
 873         talloc_free(dev->mount_path);
 874         dev->mount_path = NULL;
 875
 876         return 0;
 877 }
 878
 879 int device_request_write(struct discover_device *dev, bool *release)
 880 {
 881         int rc;
 882
 883         *release = false;
 884
 885         if (!dev->mounted)
 886                 return -1;
 887
 888         if (dev->mounted_rw)
 889                 return 0;
 890
 891         rc = process_run_simple(dev, pb_system_apps.mount, dev->mount_path,
 892                         "-o", "remount,rw", NULL);
 893         if (rc)
 894                 return -1;
 895
 896         dev->mounted_rw = true;
 897         *release = true;
 898         return 0;
 899 }
 900
 901 void device_release_write(struct discover_device *dev, bool release)
 902 {
 903         if (!release)
 904                 return;
 905
 906         process_run_simple(dev, pb_system_apps.mount, dev->mount_path,
 907                         "-o", "remount,ro", NULL);
 908         dev->mounted_rw = false;
 909 }
 910
 911 #else
 912
 913 static int umount_device(struct discover_device *dev __attribute__((unused)))
 914 {
 915         return 0;
 916 }
 917
 918 static int __attribute__((unused)) mount_device(
 919                 struct discover_device *dev __attribute__((unused)))
 920 {
 921         return 0;
 922 }
 923
 924 int device_request_write(struct discover_device *dev __attribute__((unused)),
 925                 bool *release)
 926 {
 927         *release = true;
 928         return 0;
 929 }
 930
 931 void device_release_write(struct discover_device *dev __attribute__((unused)),
 932         bool release __attribute__((unused)))
 933 {
 934 }
 935
 936 #endif
 937