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

   1 #include <assert.h>
   2 #include <inttypes.h>
   3 #include <stdlib.h>
   4 #include <stdbool.h>
   5 #include <unistd.h>
   6 #include <string.h>
   7 #include <errno.h>
   8 #include <mntent.h>
   9 #include <locale.h>
  10 #include <sys/stat.h>
  11 #include <sys/wait.h>
  12 #include <sys/mount.h>
  13
  14 #include <talloc/talloc.h>
  15 #include <list/list.h>
  16 #include <log/log.h>
  17 #include <types/types.h>
  18 #include <system/system.h>
  19 #include <process/process.h>
  20 #include <url/url.h>
  21 #include <i18n/i18n.h>
  22 #include <pb-config/pb-config.h>
  23
  24 #include <sys/sysmacros.h>
  25 #include <sys/types.h>
  26 #include <sys/socket.h>
  27 #include <netdb.h>
  28 #include <arpa/inet.h>
  29
  30 #include "device-handler.h"
  31 #include "discover-server.h"
  32 #include "devmapper.h"
  33 #include "user-event.h"
  34 #include "platform.h"
  35 #include "event.h"
  36 #include "parser.h"
  37 #include "resource.h"
  38 #include "paths.h"
  39 #include "sysinfo.h"
  40 #include "boot.h"
  41 #include "udev.h"
  42 #include "network.h"
  43 #include "ipmi.h"
  44
  45 enum default_priority {
  46         DEFAULT_PRIORITY_REMOTE         = 1,
  47         DEFAULT_PRIORITY_LOCAL_FIRST    = 2,
  48         DEFAULT_PRIORITY_LOCAL_LAST     = 0xfe,
  49         DEFAULT_PRIORITY_DISABLED       = 0xff,
  50 };
  51
  52 struct progress_info {
  53         unsigned int                    percentage;
  54         unsigned long                   size;           /* size in bytes */
  55
  56         const struct process_info       *procinfo;
  57         struct list_item        list;
  58 };
  59
  60 struct device_handler {
  61         struct discover_server  *server;
  62         int                     dry_run;
  63
  64         struct pb_udev          *udev;
  65         struct network          *network;
  66         struct user_event       *user_event;
  67
  68         struct discover_device  **devices;
  69         unsigned int            n_devices;
  70
  71         struct ramdisk_device   **ramdisks;
  72         unsigned int            n_ramdisks;
  73
  74         struct waitset          *waitset;
  75         struct waiter           *timeout_waiter;
  76         bool                    autoboot_enabled;
  77         unsigned int            sec_to_boot;
  78
  79         struct discover_boot_option *default_boot_option;
  80         int                     default_boot_option_priority;
  81
  82         struct list             unresolved_boot_options;
  83
  84         struct boot_task        *pending_boot;
  85         bool                    pending_boot_is_default;
  86
  87         struct list             progress;
  88         unsigned int            n_progress;
  89
  90         struct plugin_option    **plugins;
  91         unsigned int            n_plugins;
  92         bool                    plugin_installing;
  93 };
  94
  95 static int mount_device(struct discover_device *dev);
  96 static int umount_device(struct discover_device *dev);
  97
  98 static int device_handler_init_sources(struct device_handler *handler);
  99 static void device_handler_reinit_sources(struct device_handler *handler);
 100
 101 static void device_handler_update_lang(const char *lang);
 102
 103 void discover_context_add_boot_option(struct discover_context *ctx,
 104                 struct discover_boot_option *boot_option)
 105 {
 106         boot_option->source = ctx->parser;
 107         list_add_tail(&ctx->boot_options, &boot_option->list);
 108         talloc_steal(ctx, boot_option);
 109 }
 110
 111 /**
 112  * device_handler_get_device_count - Get the count of current handler devices.
 113  */
 114
 115 int device_handler_get_device_count(const struct device_handler *handler)
 116 {
 117         return handler->n_devices;
 118 }
 119
 120 /**
 121  * device_handler_get_device - Get a handler device by index.
 122  */
 123
 124 const struct discover_device *device_handler_get_device(
 125         const struct device_handler *handler, unsigned int index)
 126 {
 127         if (index >= handler->n_devices) {
 128                 assert(0 && "bad index");
 129                 return NULL;
 130         }
 131
 132         return handler->devices[index];
 133 }
 134
 135 /**
 136  * device_handler_get_plugin_count - Get the count of current handler plugins.
 137  */
 138 int device_handler_get_plugin_count(const struct device_handler *handler)
 139 {
 140         return handler->n_plugins;
 141 }
 142
 143 /**
 144  * discover_handler_get_plugin - Get a handler plugin by index.
 145  */
 146 const struct plugin_option *device_handler_get_plugin(
 147         const struct device_handler *handler, unsigned int index)
 148 {
 149         if (index >= handler->n_plugins) {
 150                 assert(0 && "bad index");
 151                 return NULL;
 152         }
 153
 154         return handler->plugins[index];
 155 }
 156
 157 struct network *device_handler_get_network(
 158                 const struct device_handler *handler)
 159 {
 160         return handler->network;
 161 }
 162
 163 struct discover_boot_option *discover_boot_option_create(
 164                 struct discover_context *ctx,
 165                 struct discover_device *device)
 166 {
 167         struct discover_boot_option *opt;
 168
 169         opt = talloc_zero(ctx, struct discover_boot_option);
 170         opt->option = talloc_zero(opt, struct boot_option);
 171         opt->device = device;
 172
 173         return opt;
 174 }
 175
 176 static int device_match_uuid(struct discover_device *dev, const char *uuid)
 177 {
 178         return dev->uuid && !strcmp(dev->uuid, uuid);
 179 }
 180
 181 static int device_match_label(struct discover_device *dev, const char *label)
 182 {
 183         return dev->label && !strcmp(dev->label, label);
 184 }
 185
 186 static int device_match_id(struct discover_device *dev, const char *id)
 187 {
 188         return !strcmp(dev->device->id, id);
 189 }
 190
 191 static int device_match_serial(struct discover_device *dev, const char *serial)
 192 {
 193         const char *val = discover_device_get_param(dev, "ID_SERIAL");
 194         return val && !strcmp(val, serial);
 195 }
 196
 197 static struct discover_device *device_lookup(
 198                 struct device_handler *device_handler,
 199                 int (match_fn)(struct discover_device *, const char *),
 200                 const char *str)
 201 {
 202         struct discover_device *dev;
 203         unsigned int i;
 204
 205         if (!str)
 206                 return NULL;
 207
 208         for (i = 0; i < device_handler->n_devices; i++) {
 209                 dev = device_handler->devices[i];
 210
 211                 if (match_fn(dev, str))
 212                         return dev;
 213         }
 214
 215         return NULL;
 216 }
 217
 218 struct discover_device *device_lookup_by_name(struct device_handler *handler,
 219                 const char *name)
 220 {
 221         if (!strncmp(name, "/dev/", strlen("/dev/")))
 222                 name += strlen("/dev/");
 223
 224         return device_lookup_by_id(handler, name);
 225 }
 226
 227 struct discover_device *device_lookup_by_uuid(
 228                 struct device_handler *device_handler,
 229                 const char *uuid)
 230 {
 231         return device_lookup(device_handler, device_match_uuid, uuid);
 232 }
 233
 234 struct discover_device *device_lookup_by_label(
 235                 struct device_handler *device_handler,
 236                 const char *label)
 237 {
 238         return device_lookup(device_handler, device_match_label, label);
 239 }
 240
 241 struct discover_device *device_lookup_by_id(
 242                 struct device_handler *device_handler,
 243                 const char *id)
 244 {
 245         return device_lookup(device_handler, device_match_id, id);
 246 }
 247
 248 struct discover_device *device_lookup_by_serial(
 249                 struct device_handler *device_handler,
 250                 const char *serial)
 251 {
 252         return device_lookup(device_handler, device_match_serial, serial);
 253 }
 254
 255 void device_handler_destroy(struct device_handler *handler)
 256 {
 257         talloc_free(handler);
 258 }
 259
 260 static int destroy_device(void *arg)
 261 {
 262         struct discover_device *dev = arg;
 263
 264         umount_device(dev);
 265
 266         return 0;
 267 }
 268
 269 struct discover_device *discover_device_create(struct device_handler *handler,
 270                 const char *uuid, const char *id)
 271 {
 272         struct discover_device *dev;
 273
 274         if (uuid)
 275                 dev = device_lookup_by_uuid(handler, uuid);
 276         else
 277                 dev = device_lookup_by_id(handler, id);
 278
 279         if (dev)
 280                 return dev;
 281
 282         dev = talloc_zero(handler, struct discover_device);
 283         dev->device = talloc_zero(dev, struct device);
 284         dev->device->id = talloc_strdup(dev->device, id);
 285         dev->uuid = talloc_strdup(dev, uuid);
 286         list_init(&dev->params);
 287         list_init(&dev->boot_options);
 288
 289         talloc_set_destructor(dev, destroy_device);
 290
 291         return dev;
 292 }
 293
 294 struct discover_device_param {
 295         char                    *name;
 296         char                    *value;
 297         struct list_item        list;
 298 };
 299
 300 void discover_device_set_param(struct discover_device *device,
 301                 const char *name, const char *value)
 302 {
 303         struct discover_device_param *param;
 304         bool found = false;
 305
 306         list_for_each_entry(&device->params, param, list) {
 307                 if (!strcmp(param->name, name)) {
 308                         found = true;
 309                         break;
 310                 }
 311         }
 312
 313         if (!found) {
 314                 if (!value)
 315                         return;
 316                 param = talloc(device, struct discover_device_param);
 317                 param->name = talloc_strdup(param, name);
 318                 list_add(&device->params, &param->list);
 319         } else {
 320                 if (!value) {
 321                         list_remove(&param->list);
 322                         talloc_free(param);
 323                         return;
 324                 }
 325                 talloc_free(param->value);
 326         }
 327
 328         param->value = talloc_strdup(param, value);
 329 }
 330
 331 const char *discover_device_get_param(struct discover_device *device,
 332                 const char *name)
 333 {
 334         struct discover_device_param *param;
 335
 336         list_for_each_entry(&device->params, param, list) {
 337                 if (!strcmp(param->name, name))
 338                         return param->value;
 339         }
 340         return NULL;
 341 }
 342
 343 static void set_env_variables(const struct config *config)
 344 {
 345         if (config->http_proxy)
 346                 setenv("http_proxy", config->http_proxy, 1);
 347         else
 348                 unsetenv("http_proxy");
 349
 350         if (config->https_proxy)
 351                 setenv("https_proxy", config->https_proxy, 1);
 352         else
 353                 unsetenv("https_proxy");
 354
 355         /* Reduce noise in the log from LVM listing open file descriptors */
 356         setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1);
 357 }
 358
 359 struct device_handler *device_handler_init(struct discover_server *server,
 360                 struct waitset *waitset, int dry_run)
 361 {
 362         struct device_handler *handler;
 363         int rc;
 364
 365         handler = talloc_zero(NULL, struct device_handler);
 366         handler->server = server;
 367         handler->waitset = waitset;
 368         handler->dry_run = dry_run;
 369         handler->autoboot_enabled = config_autoboot_active(config_get());
 370
 371         list_init(&handler->unresolved_boot_options);
 372
 373         list_init(&handler->progress);
 374
 375         /* set up our mount point base */
 376         pb_mkdir_recursive(mount_base());
 377
 378         parser_init();
 379
 380         if (config_get()->safe_mode)
 381                 return handler;
 382
 383         set_env_variables(config_get());
 384
 385         rc = device_handler_init_sources(handler);
 386         if (rc) {
 387                 talloc_free(handler);
 388                 return NULL;
 389         }
 390
 391         return handler;
 392 }
 393
 394 void device_handler_reinit(struct device_handler *handler)
 395 {
 396         struct discover_boot_option *opt, *tmp;
 397         struct ramdisk_device *ramdisk;
 398         struct config *config;
 399         unsigned int i;
 400
 401         device_handler_cancel_default(handler);
 402         /* Cancel any pending non-default boot */
 403         if (handler->pending_boot) {
 404                 boot_cancel(handler->pending_boot);
 405                 handler->pending_boot = NULL;
 406                 handler->pending_boot_is_default = false;
 407         }
 408
 409         /* Cancel any remaining async jobs */
 410         process_stop_async_all();
 411         pending_network_jobs_cancel();
 412
 413         /* free unresolved boot options */
 414         list_for_each_entry_safe(&handler->unresolved_boot_options,
 415                         opt, tmp, list)
 416                 talloc_free(opt);
 417         list_init(&handler->unresolved_boot_options);
 418
 419         /* drop all devices */
 420         for (i = 0; i < handler->n_devices; i++) {
 421                 discover_server_notify_device_remove(handler->server,
 422                                 handler->devices[i]->device);
 423                 ramdisk = handler->devices[i]->ramdisk;
 424                 talloc_free(handler->devices[i]);
 425                 talloc_free(ramdisk);
 426         }
 427
 428         talloc_free(handler->devices);
 429         handler->devices = NULL;
 430         handler->n_devices = 0;
 431         talloc_free(handler->ramdisks);
 432         handler->ramdisks = NULL;
 433         handler->n_ramdisks = 0;
 434
 435         /* drop any known plugins */
 436         for (i = 0; i < handler->n_plugins; i++)
 437                 talloc_free(handler->plugins[i]);
 438         talloc_free(handler->plugins);
 439         handler->plugins = NULL;
 440         handler->n_plugins = 0;
 441
 442         discover_server_notify_plugins_remove(handler->server);
 443
 444         set_env_variables(config_get());
 445
 446         /* If the safe mode warning was active disable it now */
 447         if (config_get()->safe_mode) {
 448                 config = config_copy(handler, config_get());
 449                 config->safe_mode = false;
 450                 config_set(config);
 451                 discover_server_notify_config(handler->server, config);
 452         }
 453
 454         /* Force rediscovery on SCSI devices */
 455         process_run_simple(handler, pb_system_apps.scsi_rescan, NULL);
 456
 457         device_handler_reinit_sources(handler);
 458 }
 459
 460 void device_handler_remove(struct device_handler *handler,
 461                 struct discover_device *device)
 462 {
 463         struct discover_boot_option *opt, *tmp;
 464         unsigned int i;
 465
 466         list_for_each_entry_safe(&device->boot_options, opt, tmp, list) {
 467                 if (opt == handler->default_boot_option) {
 468                         pb_log("Default option %s cancelled since device removed",
 469                                         opt->option->name);
 470                         device_handler_cancel_default(handler);
 471                         break;
 472                 }
 473         }
 474
 475         for (i = 0; i < handler->n_devices; i++)
 476                 if (handler->devices[i] == device)
 477                         break;
 478
 479         if (i == handler->n_devices) {
 480                 talloc_free(device);
 481                 return;
 482         }
 483
 484         /* Free any unresolved options, as they're currently allocated
 485          * against the handler */
 486         list_for_each_entry_safe(&handler->unresolved_boot_options,
 487                         opt, tmp, list) {
 488                 if (opt->device != device)
 489                         continue;
 490                 list_remove(&opt->list);
 491                 talloc_free(opt);
 492         }
 493
 494         /* if this is a network device, we have to unregister it from the
 495          * network code */
 496         if (device->device->type == DEVICE_TYPE_NETWORK)
 497                 network_unregister_device(handler->network, device);
 498
 499         handler->n_devices--;
 500         memmove(&handler->devices[i], &handler->devices[i + 1],
 501                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 502         handler->devices = talloc_realloc(handler, handler->devices,
 503                 struct discover_device *, handler->n_devices);
 504
 505         if (device->notified)
 506                 discover_server_notify_device_remove(handler->server,
 507                                                         device->device);
 508
 509         talloc_free(device);
 510 }
 511
 512 void device_handler_status(struct device_handler *handler,
 513                 struct status *status)
 514 {
 515         discover_server_notify_boot_status(handler->server, status);
 516 }
 517
 518 static void _device_handler_vstatus(struct device_handler *handler,
 519                 enum status_type type, const char *fmt, va_list ap)
 520 {
 521         struct status status;
 522
 523         status.type = type;
 524         status.message = talloc_vasprintf(handler, fmt, ap);
 525         status.backlog = false;
 526
 527         device_handler_status(handler, &status);
 528
 529         talloc_free(status.message);
 530 }
 531
 532 static void _device_handler_vdevstatus(struct device_handler *handler,
 533                 struct discover_device *device, enum status_type type,
 534                 const char *fmt, va_list ap)
 535 {
 536         char *msg;
 537
 538         msg = talloc_asprintf(handler, "[%s] %s",
 539                         device ? device->device->id : "unknown", fmt);
 540         _device_handler_vstatus(handler, type, msg, ap);
 541         talloc_free(msg);
 542 }
 543
 544 void device_handler_status_dev_info(struct device_handler *handler,
 545                 struct discover_device *dev, const char *fmt, ...)
 546 {
 547         va_list ap;
 548
 549         va_start(ap, fmt);
 550         _device_handler_vdevstatus(handler, dev, STATUS_INFO, fmt, ap);
 551         va_end(ap);
 552 }
 553
 554 void device_handler_status_dev_err(struct device_handler *handler,
 555                 struct discover_device *dev, const char *fmt, ...)
 556 {
 557         va_list ap;
 558
 559         va_start(ap, fmt);
 560         _device_handler_vdevstatus(handler, dev, STATUS_ERROR, fmt, ap);
 561         va_end(ap);
 562 }
 563
 564 void device_handler_status_info(struct device_handler *handler,
 565                 const char *fmt, ...)
 566 {
 567         va_list ap;
 568
 569         va_start(ap, fmt);
 570         _device_handler_vstatus(handler, STATUS_INFO, fmt, ap);
 571         va_end(ap);
 572 }
 573
 574 void device_handler_status_err(struct device_handler *handler,
 575                 const char *fmt, ...)
 576 {
 577         va_list ap;
 578
 579         va_start(ap, fmt);
 580         _device_handler_vstatus(handler, STATUS_ERROR, fmt, ap);
 581         va_end(ap);
 582 }
 583
 584 void device_handler_status_download(struct device_handler *handler,
 585                 const struct process_info *procinfo,
 586                 unsigned int percentage, unsigned int size, char suffix)
 587 {
 588         struct progress_info *p, *progress = NULL;
 589         uint64_t current_converted, current = 0;
 590         const char *units = " kMGTP";
 591         unsigned long size_bytes;
 592         char *update = NULL;
 593         double total = 0;
 594         unsigned int i;
 595         int unit = 0;
 596
 597         list_for_each_entry(&handler->progress, p, list)
 598                 if (p->procinfo == procinfo)
 599                         progress = p;
 600
 601         if (!progress) {
 602                 pb_log("Registering new progress struct\n");
 603                 progress = talloc_zero(handler, struct progress_info);
 604                 if (!progress) {
 605                         pb_log("Failed to allocate room for progress struct\n");
 606                         return;
 607                 }
 608                 progress->procinfo = procinfo;
 609                 list_add(&handler->progress, &progress->list);
 610                 handler->n_progress++;
 611         }
 612
 613         size_bytes = size;
 614         for (i = 0; i < strlen(units); i++) {
 615                 if (units[i] == suffix)
 616                         break;
 617         }
 618
 619         if (i >= strlen(units)) {
 620             pb_log("Couldn't recognise suffix '%c'\n", suffix);
 621             size_bytes = 0;
 622         } else {
 623                 while (i--)
 624                         size_bytes <<= 10;
 625         }
 626
 627         progress->percentage = percentage;
 628         progress->size = size_bytes;
 629
 630         /*
 631          * Aggregate the info we have and update status. If a progress struct
 632          * has zero for both percentage and size we assume progress information
 633          * is unavailable and fall back to a generic progress message.
 634          */
 635         list_for_each_entry(&handler->progress, p, list) {
 636                 uint64_t c;
 637                 double t;
 638                 if (!p->percentage || !p->size) {
 639                         update = talloc_asprintf(handler,
 640                                         _("%u downloads in progress..."),
 641                                         handler->n_progress);
 642                         current = total = 0;
 643                         break;
 644                 }
 645
 646                 c = p->size;
 647                 t = (100 * c) / p->percentage;
 648
 649                 current += c;
 650                 total += t;
 651         }
 652
 653         if (total) {
 654                 current_converted = current;
 655                 while (current_converted >= 1000) {
 656                         current_converted >>= 10;
 657                         unit++;
 658                 }
 659                 update = talloc_asprintf(handler,
 660                                 _("%u %s downloading: %.0f%% - %" PRIu64 "%cB"),
 661                                 handler->n_progress,
 662                                 ngettext("item", "items", handler->n_progress),
 663                                 (current / total) * 100, current_converted,
 664                                 units[unit]);
 665         }
 666
 667         if (!update) {
 668                 pb_log("%s: failed to allocate new status\n", __func__);
 669         } else {
 670                 device_handler_status_info(handler, "%s\n", update);
 671                 talloc_free(update);
 672         }
 673 }
 674
 675 static void device_handler_plugin_scan_device(struct device_handler *handler,
 676                 struct discover_device *dev)
 677 {
 678         int rc;
 679
 680         pb_debug("Scanning %s for plugin files\n", dev->device->id);
 681
 682         rc = process_run_simple(handler, pb_system_apps.pb_plugin,
 683                                 "scan", dev->mount_path,
 684                                 NULL);
 685         if (rc)
 686                 pb_log("Error from pb-plugin scan %s\n",
 687                                 dev->mount_path);
 688 }
 689
 690 void device_handler_status_download_remove(struct device_handler *handler,
 691                 struct process_info *procinfo)
 692 {
 693         struct progress_info *p, *tmp;
 694
 695         list_for_each_entry_safe(&handler->progress, p, tmp, list)
 696                 if (p->procinfo == procinfo) {
 697                         list_remove(&p->list);
 698                         talloc_free(p);
 699                         handler->n_progress--;
 700                 }
 701 }
 702
 703 static void device_handler_boot_status_cb(void *arg, struct status *status)
 704 {
 705         device_handler_status(arg, status);
 706 }
 707
 708 static void countdown_status(struct device_handler *handler,
 709                 struct discover_boot_option *opt, unsigned int sec)
 710 {
 711         struct status status;
 712
 713         status.type = STATUS_INFO;
 714         status.message = talloc_asprintf(handler,
 715                         _("Booting in %d sec: [%s] %s"), sec,
 716                         opt->device->device->id, opt->option->name);
 717         status.backlog = false;
 718
 719         device_handler_status(handler, &status);
 720
 721         talloc_free(status.message);
 722 }
 723
 724 static int default_timeout(void *arg)
 725 {
 726         struct device_handler *handler = arg;
 727         struct discover_boot_option *opt;
 728
 729         if (!handler->default_boot_option)
 730                 return 0;
 731
 732         if (handler->pending_boot)
 733                 return 0;
 734
 735         opt = handler->default_boot_option;
 736
 737         if (handler->sec_to_boot) {
 738                 countdown_status(handler, opt, handler->sec_to_boot);
 739                 handler->sec_to_boot--;
 740                 handler->timeout_waiter = waiter_register_timeout(
 741                                                 handler->waitset, 1000,
 742                                                 default_timeout, handler);
 743                 return 0;
 744         }
 745
 746         handler->timeout_waiter = NULL;
 747
 748         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 749
 750         platform_pre_boot();
 751
 752         handler->pending_boot = boot(handler, handler->default_boot_option,
 753                         NULL, handler->dry_run, device_handler_boot_status_cb,
 754                         handler);
 755         handler->pending_boot_is_default = true;
 756         return 0;
 757 }
 758
 759 struct {
 760         enum ipmi_bootdev       ipmi_type;
 761         enum device_type        device_type;
 762 } device_type_map[] = {
 763         { IPMI_BOOTDEV_NETWORK, DEVICE_TYPE_NETWORK },
 764         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_DISK },
 765         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_USB },
 766         { IPMI_BOOTDEV_CDROM, DEVICE_TYPE_OPTICAL },
 767 };
 768
 769 static bool ipmi_device_type_matches(enum ipmi_bootdev ipmi_type,
 770                 enum device_type device_type)
 771 {
 772         unsigned int i;
 773
 774         for (i = 0; i < ARRAY_SIZE(device_type_map); i++) {
 775                 if (device_type_map[i].device_type == device_type)
 776                         return device_type_map[i].ipmi_type == ipmi_type;
 777         }
 778
 779         return false;
 780 }
 781
 782 static int autoboot_option_priority(const struct config *config,
 783                                 struct discover_boot_option *opt)
 784 {
 785         enum device_type type = opt->device->device->type;
 786         const char *uuid = opt->device->uuid;
 787         struct autoboot_option *auto_opt;
 788         unsigned int i;
 789
 790         for (i = 0; i < config->n_autoboot_opts; i++) {
 791                 auto_opt = &config->autoboot_opts[i];
 792                 if (auto_opt->boot_type == BOOT_DEVICE_UUID)
 793                         if (!strcmp(auto_opt->uuid, uuid))
 794                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 795
 796                 if (auto_opt->boot_type == BOOT_DEVICE_TYPE)
 797                         if (auto_opt->type == type ||
 798                             auto_opt->type == DEVICE_TYPE_ANY)
 799                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 800         }
 801
 802         return -1;
 803 }
 804
 805 /*
 806  * We have different priorities to resolve conflicts between boot options that
 807  * report to be the default for their device. This function assigns a priority
 808  * for these options.
 809  */
 810 static enum default_priority default_option_priority(
 811                 struct discover_boot_option *opt)
 812 {
 813         const struct config *config;
 814
 815         config = config_get();
 816
 817         /* We give highest priority to IPMI-configured boot options. If
 818          * we have an IPMI bootdev configuration set, then we don't allow
 819          * any other defaults */
 820         if (config->ipmi_bootdev) {
 821                 bool ipmi_match = ipmi_device_type_matches(config->ipmi_bootdev,
 822                                 opt->device->device->type);
 823                 if (ipmi_match)
 824                         return DEFAULT_PRIORITY_REMOTE;
 825
 826                 pb_debug("handler: disabled default priority due to "
 827                                 "non-matching IPMI type %x\n",
 828                                 config->ipmi_bootdev);
 829                 return DEFAULT_PRIORITY_DISABLED;
 830         }
 831
 832         /* Next, try to match the option against the user-defined autoboot
 833          * options, either by device UUID or type. */
 834         if (config->n_autoboot_opts) {
 835                 int boot_match = autoboot_option_priority(config, opt);
 836                 if (boot_match > 0)
 837                         return boot_match;
 838         } else {
 839                 /* If there is no specific boot order, boot any device */
 840                 return DEFAULT_PRIORITY_LOCAL_FIRST;
 841         }
 842
 843         /* If the option didn't match any entry in the array, it is disabled */
 844         pb_debug("handler: disabled default priority due to "
 845                         "non-matching UUID or type\n");
 846         return DEFAULT_PRIORITY_DISABLED;
 847 }
 848
 849 static void set_default(struct device_handler *handler,
 850                 struct discover_boot_option *opt)
 851 {
 852         enum default_priority cur_prio, new_prio;
 853
 854         if (!handler->autoboot_enabled)
 855                 return;
 856
 857         pb_debug("handler: new default option: %s\n", opt->option->id);
 858
 859         new_prio = default_option_priority(opt);
 860
 861         /* Anything outside our range prevents a default boot */
 862         if (new_prio >= DEFAULT_PRIORITY_DISABLED)
 863                 return;
 864
 865         pb_debug("handler: calculated priority %d\n", new_prio);
 866
 867         /* Resolve any conflicts: if we have a new default option, it only
 868          * replaces the current if it has a higher priority. */
 869         if (handler->default_boot_option) {
 870
 871                 cur_prio = handler->default_boot_option_priority;
 872
 873                 if (new_prio < cur_prio) {
 874                         pb_log("handler: new prio %d beats "
 875                                         "old prio %d for %s\n",
 876                                         new_prio, cur_prio,
 877                                         handler->default_boot_option
 878                                                 ->option->id);
 879                         handler->default_boot_option = opt;
 880                         handler->default_boot_option_priority = new_prio;
 881                         /* extend the timeout a little, so the user sees some
 882                          * indication of the change */
 883                         handler->sec_to_boot += 2;
 884                 }
 885
 886                 return;
 887         }
 888
 889         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 890         handler->default_boot_option = opt;
 891         handler->default_boot_option_priority = new_prio;
 892
 893         pb_log("handler: boot option %s set as default, timeout %u sec.\n",
 894                opt->option->id, handler->sec_to_boot);
 895
 896         default_timeout(handler);
 897 }
 898
 899 static bool resource_is_resolved(struct resource *res)
 900 {
 901         return !res || res->resolved;
 902 }
 903
 904 /* We only use this in an assert, which will disappear if we're compiling
 905  * with NDEBUG, so we need the 'used' attribute for these builds */
 906 static bool __attribute__((used)) boot_option_is_resolved(
 907                 struct discover_boot_option *opt)
 908 {
 909         return resource_is_resolved(opt->boot_image) &&
 910                 resource_is_resolved(opt->initrd) &&
 911                 resource_is_resolved(opt->dtb) &&
 912                 resource_is_resolved(opt->args_sig_file) &&
 913                 resource_is_resolved(opt->icon);
 914 }
 915
 916 static bool resource_resolve(struct resource *res, const char *name,
 917                 struct discover_boot_option *opt,
 918                 struct device_handler *handler)
 919 {
 920         struct parser *parser = opt->source;
 921
 922         if (resource_is_resolved(res))
 923                 return true;
 924
 925         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
 926                         opt->option->id, name, parser->name);
 927         parser->resolve_resource(handler, res);
 928
 929         return res->resolved;
 930 }
 931
 932 static bool boot_option_resolve(struct discover_boot_option *opt,
 933                 struct device_handler *handler)
 934 {
 935         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 936                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 937                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 938                 resource_resolve(opt->args_sig_file, "args_sig_file", opt,
 939                         handler) &&
 940                 resource_resolve(opt->icon, "icon", opt, handler);
 941 }
 942
 943 static void boot_option_finalise(struct device_handler *handler,
 944                 struct discover_boot_option *opt)
 945 {
 946         assert(boot_option_is_resolved(opt));
 947
 948         /* check that the parsers haven't set any of the final data */
 949         assert(!opt->option->boot_image_file);
 950         assert(!opt->option->initrd_file);
 951         assert(!opt->option->dtb_file);
 952         assert(!opt->option->icon_file);
 953         assert(!opt->option->device_id);
 954         assert(!opt->option->args_sig_file);
 955
 956         if (opt->boot_image)
 957                 opt->option->boot_image_file = opt->boot_image->url->full;
 958         if (opt->initrd)
 959                 opt->option->initrd_file = opt->initrd->url->full;
 960         if (opt->dtb)
 961                 opt->option->dtb_file = opt->dtb->url->full;
 962         if (opt->icon)
 963                 opt->option->icon_file = opt->icon->url->full;
 964         if (opt->args_sig_file)
 965                 opt->option->args_sig_file = opt->args_sig_file->url->full;
 966
 967         opt->option->device_id = opt->device->device->id;
 968
 969         if (opt->option->is_default)
 970                 set_default(handler, opt);
 971 }
 972
 973 static void notify_boot_option(struct device_handler *handler,
 974                 struct discover_boot_option *opt)
 975 {
 976         struct discover_device *dev = opt->device;
 977
 978         if (!dev->notified)
 979                 discover_server_notify_device_add(handler->server,
 980                                                   opt->device->device);
 981         dev->notified = true;
 982         discover_server_notify_boot_option_add(handler->server, opt->option);
 983 }
 984
 985 static void process_boot_option_queue(struct device_handler *handler)
 986 {
 987         struct discover_boot_option *opt, *tmp;
 988
 989         list_for_each_entry_safe(&handler->unresolved_boot_options,
 990                         opt, tmp, list) {
 991
 992                 pb_debug("queue: attempting resolution for %s\n",
 993                                 opt->option->id);
 994
 995                 if (!boot_option_resolve(opt, handler))
 996                         continue;
 997
 998                 pb_debug("\tresolved!\n");
 999
1000                 list_remove(&opt->list);
1001                 list_add_tail(&opt->device->boot_options, &opt->list);
1002                 talloc_steal(opt->device, opt);
1003                 boot_option_finalise(handler, opt);
1004                 notify_boot_option(handler, opt);
1005         }
1006 }
1007
1008 struct discover_context *device_handler_discover_context_create(
1009                 struct device_handler *handler,
1010                 struct discover_device *device)
1011 {
1012         struct discover_context *ctx;
1013
1014         ctx = talloc_zero(handler, struct discover_context);
1015         ctx->handler = handler;
1016         ctx->device = device;
1017         list_init(&ctx->boot_options);
1018
1019         return ctx;
1020 }
1021
1022 void device_handler_add_device(struct device_handler *handler,
1023                 struct discover_device *device)
1024 {
1025         handler->n_devices++;
1026         handler->devices = talloc_realloc(handler, handler->devices,
1027                                 struct discover_device *, handler->n_devices);
1028         handler->devices[handler->n_devices - 1] = device;
1029
1030         if (device->device->type == DEVICE_TYPE_NETWORK)
1031                 network_register_device(handler->network, device);
1032 }
1033
1034 void device_handler_add_ramdisk(struct device_handler *handler,
1035                 const char *path)
1036 {
1037         struct ramdisk_device *dev;
1038         unsigned int i;
1039
1040         if (!path)
1041                 return;
1042
1043         for (i = 0; i < handler->n_ramdisks; i++)
1044                 if (!strcmp(handler->ramdisks[i]->path, path))
1045                         return;
1046
1047         dev = talloc_zero(handler, struct ramdisk_device);
1048         if (!dev) {
1049                 pb_log("Failed to allocate memory to track %s\n", path);
1050                 return;
1051         }
1052
1053         dev->path = talloc_strdup(handler, path);
1054
1055         handler->ramdisks = talloc_realloc(handler, handler->ramdisks,
1056                                 struct ramdisk_device *,
1057                                 handler->n_ramdisks + 1);
1058         if (!handler->ramdisks) {
1059                 pb_log("Failed to reallocate memory"
1060                        "- ramdisk tracking inconsistent!\n");
1061                 return;
1062         }
1063
1064         handler->ramdisks[i] = dev;
1065         i = handler->n_ramdisks++;
1066 }
1067
1068 struct ramdisk_device *device_handler_get_ramdisk(
1069                 struct device_handler *handler)
1070 {
1071         unsigned int i;
1072         char *name;
1073         dev_t id;
1074
1075         /* Check if free ramdisk exists */
1076         for (i = 0; i < handler->n_ramdisks; i++)
1077                 if (!handler->ramdisks[i]->snapshot &&
1078                     !handler->ramdisks[i]->origin &&
1079                     !handler->ramdisks[i]->base)
1080                         return handler->ramdisks[i];
1081
1082         /* Otherwise create a new one */
1083         name = talloc_asprintf(handler, "/dev/ram%d",
1084                         handler->n_ramdisks);
1085         if (!name) {
1086                 pb_debug("Failed to allocate memory to name /dev/ram%d",
1087                         handler->n_ramdisks);
1088                 return NULL;
1089         }
1090
1091         id = makedev(1, handler->n_ramdisks);
1092         if (mknod(name, S_IFBLK, id)) {
1093                 if (errno == EEXIST) {
1094                         /* We haven't yet received updates for existing
1095                          * ramdisks - add and use this one */
1096                         pb_debug("Using untracked ramdisk %s\n", name);
1097                 } else {
1098                         pb_log("Failed to create new ramdisk %s: %s\n",
1099                                name, strerror(errno));
1100                         return NULL;
1101                 }
1102         }
1103         device_handler_add_ramdisk(handler, name);
1104         talloc_free(name);
1105
1106         return handler->ramdisks[i];
1107 }
1108
1109 void device_handler_release_ramdisk(struct discover_device *device)
1110 {
1111         struct ramdisk_device *ramdisk = device->ramdisk;
1112
1113         talloc_free(ramdisk->snapshot);
1114         talloc_free(ramdisk->origin);
1115         talloc_free(ramdisk->base);
1116
1117         ramdisk->snapshot = ramdisk->origin = ramdisk->base = NULL;
1118         ramdisk->sectors = 0;
1119
1120         device->ramdisk = NULL;
1121 }
1122
1123 /* Start discovery on a hotplugged device. The device will be in our devices
1124  * array, but has only just been initialised by the hotplug source.
1125  */
1126 int device_handler_discover(struct device_handler *handler,
1127                 struct discover_device *dev)
1128 {
1129         struct discover_context *ctx;
1130         int rc;
1131
1132         device_handler_status_dev_info(handler, dev,
1133                 /*
1134                  * TRANSLATORS: this string will be passed the type of the
1135                  * device (eg "disk" or "network"), which will be translated
1136                  * accordingly.
1137                  */
1138                 _("Processing new %s device"),
1139                 device_type_display_name(dev->device->type));
1140
1141         /* create our context */
1142         ctx = device_handler_discover_context_create(handler, dev);
1143
1144         rc = mount_device(dev);
1145         if (rc)
1146                 goto out;
1147
1148         /* add this device to our system info */
1149         system_info_register_blockdev(dev->device->id, dev->uuid,
1150                         dev->mount_path);
1151
1152         /* run the parsers. This will populate the ctx's boot_option list. */
1153         iterate_parsers(ctx);
1154
1155         /* add discovered stuff to the handler */
1156         device_handler_discover_context_commit(handler, ctx);
1157
1158         process_boot_option_queue(handler);
1159
1160         /* Check this device for pb-plugins */
1161         device_handler_plugin_scan_device(handler, dev);
1162 out:
1163         talloc_unlink(handler, ctx);
1164
1165         return 0;
1166 }
1167
1168 /* Incoming dhcp event */
1169 int device_handler_dhcp(struct device_handler *handler,
1170                 struct discover_device *dev, struct event *event)
1171 {
1172         struct discover_context *ctx;
1173
1174         device_handler_status_dev_info(handler, dev,
1175                         _("Processing DHCP lease response (ip: %s)"),
1176                         event_get_param(event, "ip"));
1177
1178         pending_network_jobs_start();
1179
1180         /* create our context */
1181         ctx = device_handler_discover_context_create(handler, dev);
1182         talloc_steal(ctx, event);
1183         ctx->event = event;
1184
1185         iterate_parsers(ctx);
1186
1187         device_handler_discover_context_commit(handler, ctx);
1188
1189         talloc_unlink(handler, ctx);
1190
1191         return 0;
1192 }
1193
1194 static struct discover_boot_option *find_boot_option_by_id(
1195                 struct device_handler *handler, const char *id)
1196 {
1197         unsigned int i;
1198
1199         for (i = 0; i < handler->n_devices; i++) {
1200                 struct discover_device *dev = handler->devices[i];
1201                 struct discover_boot_option *opt;
1202
1203                 list_for_each_entry(&dev->boot_options, opt, list)
1204                         if (!strcmp(opt->option->id, id))
1205                                 return opt;
1206         }
1207
1208         return NULL;
1209 }
1210
1211 void device_handler_boot(struct device_handler *handler,
1212                 struct boot_command *cmd)
1213 {
1214         struct discover_boot_option *opt = NULL;
1215
1216         if (cmd->option_id && strlen(cmd->option_id))
1217                 opt = find_boot_option_by_id(handler, cmd->option_id);
1218
1219         if (handler->pending_boot)
1220                 boot_cancel(handler->pending_boot);
1221
1222         platform_pre_boot();
1223
1224         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
1225                         device_handler_boot_status_cb, handler);
1226         handler->pending_boot_is_default = false;
1227 }
1228
1229 void device_handler_cancel_default(struct device_handler *handler)
1230 {
1231         if (handler->timeout_waiter)
1232                 waiter_remove(handler->timeout_waiter);
1233
1234         handler->timeout_waiter = NULL;
1235         handler->autoboot_enabled = false;
1236
1237         /* we only send status if we had a default boot option queued */
1238         if (!handler->default_boot_option)
1239                 return;
1240
1241         pb_log("Cancelling default boot option\n");
1242
1243         if (handler->pending_boot && handler->pending_boot_is_default) {
1244                 boot_cancel(handler->pending_boot);
1245                 handler->pending_boot = NULL;
1246                 handler->pending_boot_is_default = false;
1247         }
1248
1249         handler->default_boot_option = NULL;
1250
1251         device_handler_status_info(handler, _("Default boot cancelled"));
1252 }
1253
1254 void device_handler_update_config(struct device_handler *handler,
1255                 struct config *config)
1256 {
1257         int rc;
1258
1259         rc = config_set(config);
1260         if (rc)
1261                 return;
1262
1263         discover_server_notify_config(handler->server, config);
1264         device_handler_update_lang(config->lang);
1265         device_handler_reinit(handler);
1266 }
1267
1268 static char *device_from_addr(void *ctx, struct pb_url *url)
1269 {
1270         char *ipaddr, *buf, *tok, *dev = NULL;
1271         const char *delim = " ";
1272         struct sockaddr_in *ip;
1273         struct sockaddr_in si;
1274         struct addrinfo *res;
1275         struct process *p;
1276         int rc;
1277
1278         /* Note: IPv4 only */
1279         rc = inet_pton(AF_INET, url->host, &(si.sin_addr));
1280         if (rc > 0) {
1281                 ipaddr = url->host;
1282         } else {
1283                 /* need to turn hostname into a valid IP */
1284                 rc = getaddrinfo(url->host, NULL, NULL, &res);
1285                 if (rc) {
1286                         pb_debug("%s: Invalid URL\n",__func__);
1287                         return NULL;
1288                 }
1289                 ipaddr = talloc_array(ctx,char,INET_ADDRSTRLEN);
1290                 ip = (struct sockaddr_in *) res->ai_addr;
1291                 inet_ntop(AF_INET, &(ip->sin_addr), ipaddr, INET_ADDRSTRLEN);
1292                 freeaddrinfo(res);
1293         }
1294
1295         const char *argv[] = {
1296                 pb_system_apps.ip,
1297                 "route", "show", "to", "match",
1298                 ipaddr,
1299                 NULL
1300         };
1301
1302         p = process_create(ctx);
1303
1304         p->path = pb_system_apps.ip;
1305         p->argv = argv;
1306         p->keep_stdout = true;
1307
1308         rc = process_run_sync(p);
1309
1310         if (rc || p->exit_status) {
1311                 /* ip has complained for some reason; most likely
1312                  * there is no route to the host - bail out */
1313                 pb_debug("%s: `ip` returns non-zero exit status\n", __func__);
1314                 pb_debug("ip buf: %s\n", p->stdout_buf);
1315                 process_release(p);
1316                 return NULL;
1317         }
1318
1319         buf = p->stdout_buf;
1320         /* If a route is found, ip-route output will be of the form
1321          * "... dev DEVNAME ... " */
1322         tok = strtok(buf, delim);
1323         while (tok) {
1324                 if (!strcmp(tok, "dev")) {
1325                         tok = strtok(NULL, delim);
1326                         dev = talloc_strdup(ctx, tok);
1327                         break;
1328                 }
1329                 tok = strtok(NULL, delim);
1330         }
1331
1332         process_release(p);
1333         if (dev)
1334                 pb_debug("%s: Found interface '%s'\n", __func__,dev);
1335         return dev;
1336 }
1337
1338 static void process_url_cb(struct load_url_result *result, void *data)
1339 {
1340         struct device_handler *handler;
1341         struct discover_context *ctx;
1342         struct discover_device *dev;
1343         struct event *event = data;
1344         const char *mac;
1345
1346         if (result->status != LOAD_OK) {
1347                 pb_log("%s: Load failed for %s\n", __func__, result->url->full);
1348                 return;
1349         }
1350
1351         if (!event)
1352                 return;
1353
1354         handler = talloc_parent(event);
1355         if (!handler)
1356                 return;
1357
1358         event->device = device_from_addr(event, result->url);
1359         if (!event->device) {
1360                 pb_log("Downloaded a file but can't find its interface - pretending it was local\n");
1361                 event->device = talloc_asprintf(event, "local");
1362         }
1363
1364         mac = event_get_param(event, "mac");
1365         char *url = talloc_asprintf(event, "file://%s", result->local);
1366         event_set_param(event, "pxeconffile-local", url);
1367
1368         dev = discover_device_create(handler, mac, event->device);
1369         ctx = device_handler_discover_context_create(handler, dev);
1370         talloc_steal(ctx, event);
1371         ctx->event = event;
1372
1373         iterate_parsers(ctx);
1374
1375         device_handler_discover_context_commit(handler, ctx);
1376
1377         talloc_unlink(handler, ctx);
1378 }
1379
1380 void device_handler_process_url(struct device_handler *handler,
1381                 const char *url, const char *mac, const char *ip)
1382 {
1383         struct discover_context *ctx;
1384         struct discover_device *dev;
1385         bool allow_async = false;
1386         struct pb_url *pb_url;
1387         struct event *event;
1388
1389         event = talloc_zero(handler, struct event);
1390         event->type = EVENT_TYPE_USER;
1391         event->action = EVENT_ACTION_URL;
1392
1393         pb_url = pb_url_parse(event, url);
1394         if (!pb_url || (pb_url->scheme != pb_url_file && !pb_url->host)) {
1395                 device_handler_status_err(handler, _("Invalid config URL!"));
1396                 talloc_free(event);
1397                 return;
1398         }
1399
1400         if (url[strlen(url) - 1] == '/') {
1401                 event_set_param(event, "pxepathprefix", url);
1402                 event_set_param(event, "mac", mac);
1403                 event_set_param(event, "ip", ip);
1404                 event->device = device_from_addr(event, pb_url);
1405                 if (!event->device) {
1406                         device_handler_status_err(handler,
1407                                         _("Unable to route to host %s"),
1408                                         pb_url->host);
1409                         talloc_free(event);
1410                         return;
1411                 }
1412         } else {
1413                 event_set_param(event, "pxeconffile", url);
1414                 allow_async = true;
1415         }
1416
1417         if (pb_url->scheme == pb_url_file)
1418                 event->device = talloc_asprintf(event, "local");
1419         else if (allow_async) {
1420                 /* If file is remote load asynchronously before passing to
1421                  * parser. This allows us to wait for network to be available */
1422                 if (!load_url_async(handler, pb_url, process_url_cb, event,
1423                                         NULL, handler)) {
1424                         pb_log("Failed to load url %s\n", pb_url->full);
1425                         device_handler_status_err(handler, _("Failed to load URL!"));
1426                         talloc_free(event);
1427                 }
1428                 return;
1429         }
1430
1431         /* If path is local we can parse straight away */
1432
1433         dev = discover_device_create(handler, mac, event->device);
1434         if (pb_url->scheme == pb_url_file)
1435                 dev->device->type = DEVICE_TYPE_ANY;
1436         ctx = device_handler_discover_context_create(handler, dev);
1437         talloc_steal(ctx, event);
1438         ctx->event = event;
1439
1440         iterate_parsers(ctx);
1441
1442         device_handler_discover_context_commit(handler, ctx);
1443
1444         talloc_unlink(handler, ctx);
1445 }
1446
1447 static void plugin_install_cb(struct process *process)
1448 {
1449         struct device_handler *handler = process->data;
1450
1451         if (!handler) {
1452                 pb_log("%s: Missing data!\n", __func__);
1453                 return;
1454         }
1455
1456         handler->plugin_installing = false;
1457         if (process->exit_status) {
1458                 device_handler_status_err(handler, "Plugin failed to install!");
1459                 pb_log("Failed to install plugin:\n%s\n", process->stdout_buf);
1460         }
1461 }
1462
1463 void device_handler_install_plugin(struct device_handler *handler,
1464                 const char *plugin_file)
1465 {
1466         struct process *p;
1467         int result;
1468
1469         if (handler->plugin_installing) {
1470                 pb_log("Plugin install cancelled - install already running");
1471                 return;
1472         }
1473
1474         p = process_create(handler);
1475         if (!p) {
1476                 pb_log("install_plugin: Failed to create process\n");
1477                 return;
1478         }
1479
1480         const char *argv[] = {
1481                 pb_system_apps.pb_plugin,
1482                 "install",
1483                 "auto",
1484                 plugin_file,
1485                 NULL
1486         };
1487
1488         p->path = pb_system_apps.pb_plugin;
1489         p->argv = argv;
1490         p->exit_cb = plugin_install_cb;
1491         p->data = handler;
1492         p->keep_stdout = true;
1493
1494         result = process_run_async(p);
1495
1496         if (result)
1497                 device_handler_status_err(handler, "Could not install plugin");
1498         else
1499                 handler->plugin_installing = true;
1500 }
1501
1502 #ifndef PETITBOOT_TEST
1503
1504 /**
1505  * context_commit - Commit a temporary discovery context to the handler,
1506  * and notify the clients about any new options / devices
1507  */
1508 void device_handler_discover_context_commit(struct device_handler *handler,
1509                 struct discover_context *ctx)
1510 {
1511         struct discover_device *dev = ctx->device;
1512         struct discover_boot_option *opt, *tmp;
1513
1514         if (!device_lookup_by_uuid(handler, dev->uuid))
1515                 device_handler_add_device(handler, dev);
1516
1517         /* move boot options from the context to the device */
1518         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
1519                 list_remove(&opt->list);
1520
1521                 /* All boot options need at least a kernel image */
1522                 if (!opt->boot_image || !opt->boot_image->url) {
1523                         pb_log("boot option %s is missing boot image, ignoring\n",
1524                                 opt->option->id);
1525                         talloc_free(opt);
1526                         continue;
1527                 }
1528
1529                 if (boot_option_resolve(opt, handler)) {
1530                         pb_log("boot option %s is resolved, "
1531                                         "sending to clients\n",
1532                                         opt->option->id);
1533                         list_add_tail(&dev->boot_options, &opt->list);
1534                         talloc_steal(dev, opt);
1535                         boot_option_finalise(handler, opt);
1536                         notify_boot_option(handler, opt);
1537                 } else {
1538                         if (!opt->source->resolve_resource) {
1539                                 pb_log("parser %s gave us an unresolved "
1540                                         "resource (%s), but no way to "
1541                                         "resolve it\n",
1542                                         opt->source->name, opt->option->id);
1543                                 talloc_free(opt);
1544                         } else {
1545                                 pb_log("boot option %s is unresolved, "
1546                                                 "adding to queue\n",
1547                                                 opt->option->id);
1548                                 list_add(&handler->unresolved_boot_options,
1549                                                 &opt->list);
1550                                 talloc_steal(handler, opt);
1551                         }
1552                 }
1553         }
1554 }
1555
1556 void device_handler_add_plugin_option(struct device_handler *handler,
1557                 struct plugin_option *opt)
1558 {
1559         struct plugin_option *tmp;
1560         unsigned int i;
1561
1562         for (i = 0; i < handler->n_plugins; i++) {
1563                 tmp = handler->plugins[i];
1564                 /* If both id and version match, ignore */
1565                 if (strncmp(opt->id, tmp->id, strlen(opt->id)) == 0 &&
1566                                 strcmp(opt->version, tmp->version) == 0) {
1567                         pb_log("discover: Plugin '%s' already exists, ignoring\n",
1568                                         opt->id);
1569                         return;
1570                 }
1571         }
1572
1573         handler->plugins = talloc_realloc(handler, handler->plugins,
1574                         struct plugin_option *, handler->n_plugins + 1);
1575         if (!handler->plugins) {
1576                 pb_log("Failed to allocate memory for new plugin\n");
1577                 handler->n_plugins = 0;
1578                 return;
1579         }
1580
1581         handler->plugins[handler->n_plugins++] = opt;
1582         discover_server_notify_plugin_option_add(handler->server, opt);
1583 }
1584
1585 static void device_handler_update_lang(const char *lang)
1586 {
1587         const char *cur_lang;
1588
1589         if (!lang)
1590                 return;
1591
1592         cur_lang = setlocale(LC_ALL, NULL);
1593         if (cur_lang && !strcmp(cur_lang, lang))
1594                 return;
1595
1596         setlocale(LC_ALL, lang);
1597 }
1598
1599 static int device_handler_init_sources(struct device_handler *handler)
1600 {
1601         /* init our device sources: udev, network and user events */
1602         handler->user_event = user_event_init(handler, handler->waitset);
1603         if (!handler->user_event)
1604                 return -1;
1605
1606         handler->network = network_init(handler, handler->waitset,
1607                         handler->dry_run);
1608         if (!handler->network)
1609                 return -1;
1610
1611         handler->udev = udev_init(handler, handler->waitset);
1612         if (!handler->udev)
1613                 return -1;
1614
1615         return 0;
1616 }
1617
1618 static void device_handler_reinit_sources(struct device_handler *handler)
1619 {
1620         /* if we haven't initialised sources previously (becuase we started in
1621          * safe mode), then init once here. */
1622         if (!(handler->udev || handler->network || handler->user_event)) {
1623                 device_handler_init_sources(handler);
1624                 return;
1625         }
1626
1627         system_info_reinit();
1628
1629         network_shutdown(handler->network);
1630         handler->network = network_init(handler, handler->waitset,
1631                         handler->dry_run);
1632
1633         udev_reinit(handler->udev);
1634 }
1635
1636 static inline const char *get_device_path(struct discover_device *dev)
1637 {
1638         return dev->ramdisk ? dev->ramdisk->snapshot : dev->device_path;
1639 }
1640
1641 static char *check_subvols(struct discover_device *dev)
1642 {
1643         const char *fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1644         struct stat sb;
1645         char *path;
1646         int rc;
1647
1648         if (strncmp(fstype, "btrfs", strlen("btrfs")))
1649                 return dev->mount_path;
1650
1651         /* On btrfs a device's root may be under a subvolume path */
1652         path = join_paths(dev, dev->mount_path, "@");
1653         rc = stat(path, &sb);
1654         if (!rc && S_ISDIR(sb.st_mode)) {
1655                 pb_debug("Using '%s' for btrfs root path\n", path);
1656                 return path;
1657         }
1658
1659         talloc_free(path);
1660         return dev->mount_path;
1661 }
1662
1663 static bool check_existing_mount(struct discover_device *dev)
1664 {
1665         struct stat devstat, mntstat;
1666         const char *device_path;
1667         struct mntent *mnt;
1668         FILE *fp;
1669         int rc;
1670
1671         device_path = get_device_path(dev);
1672
1673         rc = stat(device_path, &devstat);
1674         if (rc) {
1675                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
1676                 return false;
1677         }
1678
1679         if (!S_ISBLK(devstat.st_mode)) {
1680                 pb_debug("%s: %s isn't a block device?\n", __func__,
1681                                 dev->device_path);
1682                 return false;
1683         }
1684
1685         fp = fopen("/proc/self/mounts", "r");
1686
1687         for (;;) {
1688                 mnt = getmntent(fp);
1689                 if (!mnt)
1690                         break;
1691
1692                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
1693                         continue;
1694
1695                 rc = stat(mnt->mnt_fsname, &mntstat);
1696                 if (rc)
1697                         continue;
1698
1699                 if (!S_ISBLK(mntstat.st_mode))
1700                         continue;
1701
1702                 if (mntstat.st_rdev == devstat.st_rdev) {
1703                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
1704                         dev->root_path = check_subvols(dev);
1705                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
1706                         dev->mounted = true;
1707                         dev->unmount = false;
1708
1709                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
1710                                         __func__, dev->device_path,
1711                                         dev->mounted_rw ? 'w' : 'o',
1712                                         mnt->mnt_dir);
1713                         break;
1714                 }
1715         }
1716
1717         fclose(fp);
1718
1719         return mnt != NULL;
1720 }
1721
1722 /*
1723  * Attempt to mount a filesystem safely, while handling certain filesytem-
1724  * specific options
1725  */
1726 static int try_mount(const char *device_path, const char *mount_path,
1727                              const char *fstype, unsigned long flags,
1728                              bool have_snapshot)
1729 {
1730         const char *fs, *safe_opts;
1731         int rc;
1732
1733         /* Mount ext3 as ext4 instead so 'norecovery' can be used */
1734         if (strncmp(fstype, "ext3", strlen("ext3")) == 0) {
1735                 pb_debug("Mounting ext3 filesystem as ext4\n");
1736                 fs = "ext4";
1737         } else
1738                 fs = fstype;
1739
1740         if (strncmp(fs, "xfs", strlen("xfs")) == 0 ||
1741             strncmp(fs, "ext4", strlen("ext4")) == 0)
1742                 safe_opts = "norecovery";
1743         else
1744                 safe_opts = NULL;
1745
1746         errno = 0;
1747         /* If no snapshot is available don't attempt recovery */
1748         if (!have_snapshot)
1749                 return mount(device_path, mount_path, fs, flags, safe_opts);
1750
1751         rc = mount(device_path, mount_path, fs, flags, NULL);
1752
1753         if (!rc)
1754                 return rc;
1755
1756         /* Mounting failed; some filesystems will fail to mount if a recovery
1757          * journal exists (eg. cross-endian XFS), so try again with norecovery
1758          * where that option is available.
1759          * If mounting read-write just return the error as norecovery is not a
1760          * valid option */
1761         if ((flags & MS_RDONLY) != MS_RDONLY || !safe_opts)
1762                 return rc;
1763
1764         errno = 0;
1765         return mount(device_path, mount_path, fs, flags, safe_opts);
1766 }
1767
1768 static int mount_device(struct discover_device *dev)
1769 {
1770         const char *fstype, *device_path;
1771         int rc;
1772
1773         if (!dev->device_path)
1774                 return -1;
1775
1776         if (dev->mounted)
1777                 return 0;
1778
1779         if (check_existing_mount(dev))
1780                 return 0;
1781
1782         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1783         if (!fstype)
1784                 return 0;
1785
1786         dev->mount_path = join_paths(dev, mount_base(),
1787                                         dev->device_path);
1788
1789         if (pb_mkdir_recursive(dev->mount_path)) {
1790                 pb_log("couldn't create mount directory %s: %s\n",
1791                                 dev->mount_path, strerror(errno));
1792                 goto err_free;
1793         }
1794
1795         device_path = get_device_path(dev);
1796
1797         pb_log("mounting device %s read-only\n", dev->device_path);
1798         rc = try_mount(device_path, dev->mount_path, fstype,
1799                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1800
1801         /* If mount fails clean up any snapshot and try again */
1802         if (rc && dev->ramdisk) {
1803                 pb_log("couldn't mount snapshot for %s: mount failed: %s\n",
1804                                 device_path, strerror(errno));
1805                 pb_log("falling back to actual device\n");
1806
1807                 devmapper_destroy_snapshot(dev);
1808
1809                 device_path = get_device_path(dev);
1810                 pb_log("mounting device %s read-only\n", dev->device_path);
1811                 rc = try_mount(device_path, dev->mount_path, fstype,
1812                                MS_RDONLY | MS_SILENT, dev->ramdisk);
1813         }
1814
1815         if (!rc) {
1816                 dev->mounted = true;
1817                 dev->mounted_rw = false;
1818                 dev->unmount = true;
1819                 dev->root_path = check_subvols(dev);
1820                 return 0;
1821         }
1822
1823         pb_log("couldn't mount device %s: mount failed: %s\n",
1824                         device_path, strerror(errno));
1825
1826         pb_rmdir_recursive(mount_base(), dev->mount_path);
1827 err_free:
1828         talloc_free(dev->mount_path);
1829         dev->mount_path = NULL;
1830         return -1;
1831 }
1832
1833 static int umount_device(struct discover_device *dev)
1834 {
1835         const char *device_path;
1836         int rc;
1837
1838         if (!dev->mounted || !dev->unmount)
1839                 return 0;
1840
1841         device_path = get_device_path(dev);
1842
1843         pb_log("unmounting device %s\n", device_path);
1844         rc = umount(dev->mount_path);
1845         if (rc)
1846                 return -1;
1847
1848         dev->mounted = false;
1849         devmapper_destroy_snapshot(dev);
1850
1851         pb_rmdir_recursive(mount_base(), dev->mount_path);
1852
1853         talloc_free(dev->mount_path);
1854         dev->mount_path = NULL;
1855         dev->root_path = NULL;
1856
1857         return 0;
1858 }
1859
1860 int device_request_write(struct discover_device *dev, bool *release)
1861 {
1862         const char *fstype, *device_path;
1863         const struct config *config;
1864         int rc;
1865
1866         *release = false;
1867
1868         config = config_get();
1869         if (!config->allow_writes)
1870                 return -1;
1871
1872         if (!dev->mounted)
1873                 return -1;
1874
1875         if (dev->mounted_rw)
1876                 return 0;
1877
1878         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1879
1880         device_path = get_device_path(dev);
1881
1882         pb_log("remounting device %s read-write\n", device_path);
1883
1884         rc = umount(dev->mount_path);
1885         if (rc) {
1886                 pb_log("Failed to unmount %s: %s\n",
1887                        dev->mount_path, strerror(errno));
1888                 return -1;
1889         }
1890
1891         rc = try_mount(device_path, dev->mount_path, fstype,
1892                        MS_SILENT, dev->ramdisk);
1893         if (rc)
1894                 goto mount_ro;
1895
1896         dev->mounted_rw = true;
1897         *release = true;
1898         return 0;
1899
1900 mount_ro:
1901         pb_log("Unable to remount device %s read-write: %s\n",
1902                device_path, strerror(errno));
1903         rc = try_mount(device_path, dev->mount_path, fstype,
1904                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1905         if (rc)
1906                 pb_log("Unable to recover mount for %s: %s\n",
1907                        device_path, strerror(errno));
1908         return -1;
1909 }
1910
1911 void device_release_write(struct discover_device *dev, bool release)
1912 {
1913         const char *fstype, *device_path;
1914
1915         if (!release)
1916                 return;
1917
1918         device_path = get_device_path(dev);
1919
1920         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1921
1922         pb_log("remounting device %s read-only\n", device_path);
1923
1924         if (umount(dev->mount_path)) {
1925                 pb_log("Failed to unmount %s\n", dev->mount_path);
1926                 return;
1927         }
1928         dev->mounted_rw = dev->mounted = false;
1929
1930         if (dev->ramdisk) {
1931                 devmapper_merge_snapshot(dev);
1932                 /* device_path becomes stale after merge */
1933                 device_path = get_device_path(dev);
1934         }
1935
1936         if (try_mount(device_path, dev->mount_path, fstype,
1937                        MS_RDONLY | MS_SILENT, dev->ramdisk))
1938                 pb_log("Failed to remount %s read-only: %s\n",
1939                        device_path, strerror(errno));
1940         else
1941                 dev->mounted = true;
1942 }
1943
1944 void device_sync_snapshots(struct device_handler *handler, const char *device)
1945 {
1946         struct discover_device *dev = NULL;
1947         unsigned int i;
1948
1949         if (device) {
1950                 /* Find matching device and sync */
1951                 dev = device_lookup_by_name(handler, device);
1952                 if (!dev) {
1953                         pb_log("%s: device name '%s' unrecognised\n",
1954                                 __func__, device);
1955                         return;
1956                 }
1957                 if (dev->ramdisk)
1958                         device_release_write(dev, true);
1959                 else
1960                         pb_log("%s has no snapshot to merge, skipping\n",
1961                                 dev->device->id);
1962                 return;
1963         }
1964
1965         /* Otherwise sync all relevant devices */
1966         for (i = 0; i < handler->n_devices; i++) {
1967                 dev = handler->devices[i];
1968                 if (dev->device->type != DEVICE_TYPE_DISK &&
1969                         dev->device->type != DEVICE_TYPE_USB)
1970                         continue;
1971                 if (dev->ramdisk)
1972                         device_release_write(dev, true);
1973                 else
1974                         pb_log("%s has no snapshot to merge, skipping\n",
1975                                 dev->device->id);
1976         }
1977 }
1978
1979 #else
1980
1981 void device_handler_discover_context_commit(
1982                 struct device_handler *handler __attribute__((unused)),
1983                 struct discover_context *ctx __attribute__((unused)))
1984 {
1985         pb_log("%s stubbed out for test cases\n", __func__);
1986 }
1987
1988 static void device_handler_update_lang(const char *lang __attribute__((unused)))
1989 {
1990 }
1991
1992 static int device_handler_init_sources(
1993                 struct device_handler *handler __attribute__((unused)))
1994 {
1995         return 0;
1996 }
1997
1998 static void device_handler_reinit_sources(
1999                 struct device_handler *handler __attribute__((unused)))
2000 {
2001 }
2002
2003 static int umount_device(struct discover_device *dev __attribute__((unused)))
2004 {
2005         return 0;
2006 }
2007
2008 static int __attribute__((unused)) mount_device(
2009                 struct discover_device *dev __attribute__((unused)))
2010 {
2011         return 0;
2012 }
2013
2014 int device_request_write(struct discover_device *dev __attribute__((unused)),
2015                 bool *release)
2016 {
2017         *release = true;
2018         return 0;
2019 }
2020
2021 void device_release_write(struct discover_device *dev __attribute__((unused)),
2022         bool release __attribute__((unused)))
2023 {
2024 }
2025
2026 void device_sync_snapshots(
2027                 struct device_handler *handler __attribute__((unused)),
2028                 const char *device __attribute__((unused)))
2029 {
2030 }
2031
2032 #endif