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                 prio->type == DEVICE_TYPE_ANY;
 377 }
 378
 379 static int default_option_priority(struct discover_boot_option *opt)
 380 {
 381         const struct config *config;
 382         struct boot_priority *prio;
 383         unsigned int i;
 384
 385         config = config_get();
 386
 387         for (i = 0; i < config->n_boot_priorities; i++) {
 388                 prio = &config->boot_priorities[i];
 389                 if (priority_match(prio, opt))
 390                         return prio->priority;
 391         }
 392
 393         return 0;
 394 }
 395
 396 static void set_default(struct device_handler *handler,
 397                 struct discover_boot_option *opt)
 398 {
 399         int new_prio;
 400
 401         if (!handler->autoboot_enabled)
 402                 return;
 403
 404         new_prio = default_option_priority(opt);
 405
 406         /* A negative priority indicates that we don't want to boot this device
 407          * by default */
 408         if (new_prio < 0)
 409                 return;
 410
 411         /* Resolve any conflicts: if we have a new default option, it only
 412          * replaces the current if it has a higher priority. */
 413         if (handler->default_boot_option) {
 414                 int cur_prio;
 415
 416                 cur_prio = default_option_priority(
 417                                         handler->default_boot_option);
 418
 419                 if (new_prio > cur_prio) {
 420                         handler->default_boot_option = opt;
 421                         /* extend the timeout a little, so the user sees some
 422                          * indication of the change */
 423                         handler->sec_to_boot += 2;
 424                 }
 425
 426                 return;
 427         }
 428
 429         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 430         handler->default_boot_option = opt;
 431
 432         pb_log("Boot option %s set as default, timeout %u sec.\n",
 433                opt->option->id, handler->sec_to_boot);
 434
 435         default_timeout(handler);
 436 }
 437
 438 static bool resource_is_resolved(struct resource *res)
 439 {
 440         return !res || res->resolved;
 441 }
 442
 443 /* We only use this in an assert, which will disappear if we're compiling
 444  * with NDEBUG, so we need the 'used' attribute for these builds */
 445 static bool __attribute__((used)) boot_option_is_resolved(
 446                 struct discover_boot_option *opt)
 447 {
 448         return resource_is_resolved(opt->boot_image) &&
 449                 resource_is_resolved(opt->initrd) &&
 450                 resource_is_resolved(opt->dtb) &&
 451                 resource_is_resolved(opt->icon);
 452 }
 453
 454 static bool resource_resolve(struct resource *res, const char *name,
 455                 struct discover_boot_option *opt,
 456                 struct device_handler *handler)
 457 {
 458         struct parser *parser = opt->source;
 459
 460         if (resource_is_resolved(res))
 461                 return true;
 462
 463         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
 464                         opt->option->id, name, parser->name);
 465         parser->resolve_resource(handler, res);
 466
 467         return res->resolved;
 468 }
 469
 470 static bool boot_option_resolve(struct discover_boot_option *opt,
 471                 struct device_handler *handler)
 472 {
 473         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 474                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 475                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 476                 resource_resolve(opt->icon, "icon", opt, handler);
 477 }
 478
 479 static void boot_option_finalise(struct device_handler *handler,
 480                 struct discover_boot_option *opt)
 481 {
 482         assert(boot_option_is_resolved(opt));
 483
 484         /* check that the parsers haven't set any of the final data */
 485         assert(!opt->option->boot_image_file);
 486         assert(!opt->option->initrd_file);
 487         assert(!opt->option->dtb_file);
 488         assert(!opt->option->icon_file);
 489         assert(!opt->option->device_id);
 490
 491         if (opt->boot_image)
 492                 opt->option->boot_image_file = opt->boot_image->url->full;
 493         if (opt->initrd)
 494                 opt->option->initrd_file = opt->initrd->url->full;
 495         if (opt->dtb)
 496                 opt->option->dtb_file = opt->dtb->url->full;
 497         if (opt->icon)
 498                 opt->option->icon_file = opt->icon->url->full;
 499
 500         opt->option->device_id = opt->device->device->id;
 501
 502         if (opt->option->is_default)
 503                 set_default(handler, opt);
 504 }
 505
 506 static void notify_boot_option(struct device_handler *handler,
 507                 struct discover_boot_option *opt)
 508 {
 509         struct discover_device *dev = opt->device;
 510
 511         if (!dev->notified)
 512                 discover_server_notify_device_add(handler->server,
 513                                                   opt->device->device);
 514         dev->notified = true;
 515         discover_server_notify_boot_option_add(handler->server, opt->option);
 516 }
 517
 518 static void process_boot_option_queue(struct device_handler *handler)
 519 {
 520         struct discover_boot_option *opt, *tmp;
 521
 522         list_for_each_entry_safe(&handler->unresolved_boot_options,
 523                         opt, tmp, list) {
 524
 525                 pb_debug("queue: attempting resolution for %s\n",
 526                                 opt->option->id);
 527
 528                 if (!boot_option_resolve(opt, handler))
 529                         continue;
 530
 531                 pb_debug("\tresolved!\n");
 532
 533                 list_remove(&opt->list);
 534                 list_add_tail(&opt->device->boot_options, &opt->list);
 535                 talloc_steal(opt->device, opt);
 536                 boot_option_finalise(handler, opt);
 537                 notify_boot_option(handler, opt);
 538         }
 539 }
 540
 541 struct discover_context *device_handler_discover_context_create(
 542                 struct device_handler *handler,
 543                 struct discover_device *device)
 544 {
 545         struct discover_context *ctx;
 546
 547         ctx = talloc_zero(handler, struct discover_context);
 548         ctx->device = device;
 549         list_init(&ctx->boot_options);
 550
 551         return ctx;
 552 }
 553
 554 /**
 555  * context_commit - Commit a temporary discovery context to the handler,
 556  * and notify the clients about any new options / devices
 557  */
 558 void device_handler_discover_context_commit(struct device_handler *handler,
 559                 struct discover_context *ctx)
 560 {
 561         struct discover_device *dev = ctx->device;
 562         struct discover_boot_option *opt, *tmp;
 563
 564         if (!device_lookup_by_id(handler, dev->device->id))
 565                 device_handler_add_device(handler, dev);
 566
 567         /* move boot options from the context to the device */
 568         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
 569                 list_remove(&opt->list);
 570
 571                 if (boot_option_resolve(opt, handler)) {
 572                         pb_log("boot option %s is resolved, "
 573                                         "sending to clients\n",
 574                                         opt->option->id);
 575                         list_add_tail(&dev->boot_options, &opt->list);
 576                         talloc_steal(dev, opt);
 577                         boot_option_finalise(handler, opt);
 578                         notify_boot_option(handler, opt);
 579                 } else {
 580                         if (!opt->source->resolve_resource) {
 581                                 pb_log("parser %s gave us an unresolved "
 582                                         "resource (%s), but no way to "
 583                                         "resolve it\n",
 584                                         opt->source->name, opt->option->id);
 585                                 talloc_free(opt);
 586                         } else {
 587                                 pb_log("boot option %s is unresolved, "
 588                                                 "adding to queue\n",
 589                                                 opt->option->id);
 590                                 list_add(&handler->unresolved_boot_options,
 591                                                 &opt->list);
 592                                 talloc_steal(handler, opt);
 593                         }
 594                 }
 595         }
 596 }
 597
 598 void device_handler_add_device(struct device_handler *handler,
 599                 struct discover_device *device)
 600 {
 601         handler->n_devices++;
 602         handler->devices = talloc_realloc(handler, handler->devices,
 603                                 struct discover_device *, handler->n_devices);
 604         handler->devices[handler->n_devices - 1] = device;
 605
 606 }
 607
 608 /* Start discovery on a hotplugged device. The device will be in our devices
 609  * array, but has only just been initialised by the hotplug source.
 610  */
 611 int device_handler_discover(struct device_handler *handler,
 612                 struct discover_device *dev)
 613 {
 614         struct discover_context *ctx;
 615         int rc;
 616
 617         process_boot_option_queue(handler);
 618
 619         /* create our context */
 620         ctx = device_handler_discover_context_create(handler, dev);
 621
 622         rc = mount_device(dev);
 623         if (rc)
 624                 goto out;
 625
 626         /* add this device to our system info */
 627         system_info_register_blockdev(dev->device->id, dev->uuid,
 628                         dev->mount_path);
 629
 630         /* run the parsers. This will populate the ctx's boot_option list. */
 631         iterate_parsers(ctx);
 632
 633         /* add discovered stuff to the handler */
 634         device_handler_discover_context_commit(handler, ctx);
 635
 636 out:
 637         talloc_free(ctx);
 638
 639         return 0;
 640 }
 641
 642 /* Incoming dhcp event */
 643 int device_handler_dhcp(struct device_handler *handler,
 644                 struct discover_device *dev, struct event *event)
 645 {
 646         struct discover_context *ctx;
 647
 648         /* create our context */
 649         ctx = device_handler_discover_context_create(handler, dev);
 650         ctx->event = event;
 651
 652         iterate_parsers(ctx);
 653
 654         device_handler_discover_context_commit(handler, ctx);
 655
 656         talloc_free(ctx);
 657
 658         return 0;
 659 }
 660
 661 /* incoming conf event */
 662 int device_handler_conf(struct device_handler *handler,
 663                 struct discover_device *dev, struct pb_url *url)
 664 {
 665         struct discover_context *ctx;
 666
 667         /* create our context */
 668         ctx = device_handler_discover_context_create(handler, dev);
 669         ctx->conf_url = url;
 670
 671         iterate_parsers(ctx);
 672
 673         device_handler_discover_context_commit(handler, ctx);
 674
 675         talloc_free(ctx);
 676
 677         return 0;
 678 }
 679
 680 static struct discover_boot_option *find_boot_option_by_id(
 681                 struct device_handler *handler, const char *id)
 682 {
 683         unsigned int i;
 684
 685         for (i = 0; i < handler->n_devices; i++) {
 686                 struct discover_device *dev = handler->devices[i];
 687                 struct discover_boot_option *opt;
 688
 689                 list_for_each_entry(&dev->boot_options, opt, list)
 690                         if (!strcmp(opt->option->id, id))
 691                                 return opt;
 692         }
 693
 694         return NULL;
 695 }
 696
 697 void device_handler_boot(struct device_handler *handler,
 698                 struct boot_command *cmd)
 699 {
 700         struct discover_boot_option *opt = NULL;
 701
 702         if (cmd->option_id && strlen(cmd->option_id))
 703                 opt = find_boot_option_by_id(handler, cmd->option_id);
 704
 705         if (handler->pending_boot)
 706                 boot_cancel(handler->pending_boot);
 707         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
 708                         boot_status, handler);
 709         handler->pending_boot_is_default = false;
 710 }
 711
 712 void device_handler_cancel_default(struct device_handler *handler)
 713 {
 714         struct boot_status status;
 715
 716         if (handler->timeout_waiter)
 717                 waiter_remove(handler->timeout_waiter);
 718
 719         handler->timeout_waiter = NULL;
 720         handler->autoboot_enabled = false;
 721
 722         /* we only send status if we had a default boot option queued */
 723         if (!handler->default_boot_option)
 724                 return;
 725
 726         pb_log("Cancelling default boot option\n");
 727
 728         if (handler->pending_boot && handler->pending_boot_is_default) {
 729                 boot_cancel(handler->pending_boot);
 730                 handler->pending_boot = NULL;
 731                 handler->pending_boot_is_default = false;
 732         }
 733
 734         handler->default_boot_option = NULL;
 735
 736         status.type = BOOT_STATUS_INFO;
 737         status.progress = -1;
 738         status.detail = NULL;
 739         status.message = "Default boot cancelled";
 740
 741         discover_server_notify_boot_status(handler->server, &status);
 742 }
 743
 744 void device_handler_update_config(struct device_handler *handler,
 745                 struct config *config)
 746 {
 747         config_set(config);
 748         discover_server_notify_config(handler->server, config);
 749 }
 750
 751 #ifndef PETITBOOT_TEST
 752 static bool check_existing_mount(struct discover_device *dev)
 753 {
 754         struct stat devstat, mntstat;
 755         struct mntent *mnt;
 756         FILE *fp;
 757         int rc;
 758
 759         rc = stat(dev->device_path, &devstat);
 760         if (rc) {
 761                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
 762                 return false;
 763         }
 764
 765         if (!S_ISBLK(devstat.st_mode)) {
 766                 pb_debug("%s: %s isn't a block device?\n", __func__,
 767                                 dev->device_path);
 768                 return false;
 769         }
 770
 771         fp = fopen("/proc/self/mounts", "r");
 772
 773         for (;;) {
 774                 mnt = getmntent(fp);
 775                 if (!mnt)
 776                         break;
 777
 778                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
 779                         continue;
 780
 781                 rc = stat(mnt->mnt_fsname, &mntstat);
 782                 if (rc)
 783                         continue;
 784
 785                 if (!S_ISBLK(mntstat.st_mode))
 786                         continue;
 787
 788                 if (mntstat.st_rdev == devstat.st_rdev) {
 789                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
 790                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
 791                         dev->mounted = true;
 792                         dev->unmount = false;
 793
 794                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
 795                                         __func__, dev->device_path,
 796                                         dev->mounted_rw ? 'w' : 'o',
 797                                         mnt->mnt_dir);
 798                         break;
 799                 }
 800         }
 801
 802         fclose(fp);
 803
 804         return mnt != NULL;
 805 }
 806
 807 static int mount_device(struct discover_device *dev)
 808 {
 809         int rc;
 810
 811         if (!dev->device_path)
 812                 return -1;
 813
 814         if (dev->mounted)
 815                 return 0;
 816
 817         if (check_existing_mount(dev))
 818                 return 0;
 819
 820         dev->mount_path = join_paths(dev, mount_base(),
 821                                         dev->device_path);
 822
 823         if (pb_mkdir_recursive(dev->mount_path)) {
 824                 pb_log("couldn't create mount directory %s: %s\n",
 825                                 dev->mount_path, strerror(errno));
 826                 goto err_free;
 827         }
 828
 829         rc = process_run_simple(dev, pb_system_apps.mount,
 830                         dev->device_path, dev->mount_path,
 831                         "-o", "ro", NULL);
 832         if (!rc) {
 833                 dev->mounted = true;
 834                 dev->mounted_rw = false;
 835                 dev->unmount = true;
 836                 return 0;
 837         }
 838
 839         /* Retry mount without ro option. */
 840         rc = process_run_simple(dev, pb_system_apps.mount,
 841                         dev->device_path, dev->mount_path, NULL);
 842
 843         if (!rc) {
 844                 dev->mounted = true;
 845                 dev->mounted_rw = true;
 846                 dev->unmount = true;
 847                 return 0;
 848         }
 849
 850         pb_rmdir_recursive(mount_base(), dev->mount_path);
 851 err_free:
 852         talloc_free(dev->mount_path);
 853         dev->mount_path = NULL;
 854         return -1;
 855 }
 856
 857 static int umount_device(struct discover_device *dev)
 858 {
 859         int status;
 860
 861         if (!dev->mounted || !dev->unmount)
 862                 return 0;
 863
 864         status = process_run_simple(dev, pb_system_apps.umount,
 865                         dev->mount_path, NULL);
 866
 867         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 868                 return -1;
 869
 870         dev->mounted = false;
 871
 872         pb_rmdir_recursive(mount_base(), dev->mount_path);
 873
 874         talloc_free(dev->mount_path);
 875         dev->mount_path = NULL;
 876
 877         return 0;
 878 }
 879
 880 int device_request_write(struct discover_device *dev, bool *release)
 881 {
 882         int rc;
 883
 884         *release = false;
 885
 886         if (!dev->mounted)
 887                 return -1;
 888
 889         if (dev->mounted_rw)
 890                 return 0;
 891
 892         rc = process_run_simple(dev, pb_system_apps.mount, dev->mount_path,
 893                         "-o", "remount,rw", NULL);
 894         if (rc)
 895                 return -1;
 896
 897         dev->mounted_rw = true;
 898         *release = true;
 899         return 0;
 900 }
 901
 902 void device_release_write(struct discover_device *dev, bool release)
 903 {
 904         if (!release)
 905                 return;
 906
 907         process_run_simple(dev, pb_system_apps.mount, dev->mount_path,
 908                         "-o", "remount,ro", NULL);
 909         dev->mounted_rw = false;
 910 }
 911
 912 #else
 913
 914 static int umount_device(struct discover_device *dev __attribute__((unused)))
 915 {
 916         return 0;
 917 }
 918
 919 static int __attribute__((unused)) mount_device(
 920                 struct discover_device *dev __attribute__((unused)))
 921 {
 922         return 0;
 923 }
 924
 925 int device_request_write(struct discover_device *dev __attribute__((unused)),
 926                 bool *release)
 927 {
 928         *release = true;
 929         return 0;
 930 }
 931
 932 void device_release_write(struct discover_device *dev __attribute__((unused)),
 933         bool release __attribute__((unused)))
 934 {
 935 }
 936
 937 #endif
 938