discover: use helpers for status reporting
[petitboot] / discover / device-handler.c
1 #include <assert.h>
2 #include <stdlib.h>
3 #include <stdbool.h>
4 #include <unistd.h>
5 #include <string.h>
6 #include <errno.h>
7 #include <mntent.h>
8 #include <locale.h>
9 #include <sys/stat.h>
10 #include <sys/wait.h>
11 #include <sys/mount.h>
12
13 #include <talloc/talloc.h>
14 #include <list/list.h>
15 #include <log/log.h>
16 #include <types/types.h>
17 #include <system/system.h>
18 #include <process/process.h>
19 #include <url/url.h>
20 #include <i18n/i18n.h>
21
22 #include <sys/types.h>
23 #include <sys/socket.h>
24 #include <netdb.h>
25 #include <arpa/inet.h>
26
27 #include "device-handler.h"
28 #include "discover-server.h"
29 #include "devmapper.h"
30 #include "user-event.h"
31 #include "platform.h"
32 #include "event.h"
33 #include "parser.h"
34 #include "resource.h"
35 #include "paths.h"
36 #include "sysinfo.h"
37 #include "boot.h"
38 #include "udev.h"
39 #include "network.h"
40 #include "ipmi.h"
41
42 enum default_priority {
43         DEFAULT_PRIORITY_REMOTE         = 1,
44         DEFAULT_PRIORITY_LOCAL_FIRST    = 2,
45         DEFAULT_PRIORITY_LOCAL_LAST     = 0xfe,
46         DEFAULT_PRIORITY_DISABLED       = 0xff,
47 };
48
49 struct device_handler {
50         struct discover_server  *server;
51         int                     dry_run;
52
53         struct pb_udev          *udev;
54         struct network          *network;
55         struct user_event       *user_event;
56
57         struct discover_device  **devices;
58         unsigned int            n_devices;
59
60         struct ramdisk_device   **ramdisks;
61         unsigned int            n_ramdisks;
62
63         struct waitset          *waitset;
64         struct waiter           *timeout_waiter;
65         bool                    autoboot_enabled;
66         unsigned int            sec_to_boot;
67
68         struct discover_boot_option *default_boot_option;
69         int                     default_boot_option_priority;
70
71         struct list             unresolved_boot_options;
72
73         struct boot_task        *pending_boot;
74         bool                    pending_boot_is_default;
75 };
76
77 static int mount_device(struct discover_device *dev);
78 static int umount_device(struct discover_device *dev);
79
80 static int device_handler_init_sources(struct device_handler *handler);
81 static void device_handler_reinit_sources(struct device_handler *handler);
82
83 static void device_handler_update_lang(const char *lang);
84
85 void discover_context_add_boot_option(struct discover_context *ctx,
86                 struct discover_boot_option *boot_option)
87 {
88         boot_option->source = ctx->parser;
89         list_add_tail(&ctx->boot_options, &boot_option->list);
90         talloc_steal(ctx, boot_option);
91 }
92
93 /**
94  * device_handler_get_device_count - Get the count of current handler devices.
95  */
96
97 int device_handler_get_device_count(const struct device_handler *handler)
98 {
99         return handler->n_devices;
100 }
101
102 /**
103  * device_handler_get_device - Get a handler device by index.
104  */
105
106 const struct discover_device *device_handler_get_device(
107         const struct device_handler *handler, unsigned int index)
108 {
109         if (index >= handler->n_devices) {
110                 assert(0 && "bad index");
111                 return NULL;
112         }
113
114         return handler->devices[index];
115 }
116
117 struct discover_boot_option *discover_boot_option_create(
118                 struct discover_context *ctx,
119                 struct discover_device *device)
120 {
121         struct discover_boot_option *opt;
122
123         opt = talloc_zero(ctx, struct discover_boot_option);
124         opt->option = talloc_zero(opt, struct boot_option);
125         opt->device = device;
126
127         return opt;
128 }
129
130 static int device_match_uuid(struct discover_device *dev, const char *uuid)
131 {
132         return dev->uuid && !strcmp(dev->uuid, uuid);
133 }
134
135 static int device_match_label(struct discover_device *dev, const char *label)
136 {
137         return dev->label && !strcmp(dev->label, label);
138 }
139
140 static int device_match_id(struct discover_device *dev, const char *id)
141 {
142         return !strcmp(dev->device->id, id);
143 }
144
145 static int device_match_serial(struct discover_device *dev, const char *serial)
146 {
147         const char *val = discover_device_get_param(dev, "ID_SERIAL");
148         return val && !strcmp(val, serial);
149 }
150
151 static struct discover_device *device_lookup(
152                 struct device_handler *device_handler,
153                 int (match_fn)(struct discover_device *, const char *),
154                 const char *str)
155 {
156         struct discover_device *dev;
157         unsigned int i;
158
159         if (!str)
160                 return NULL;
161
162         for (i = 0; i < device_handler->n_devices; i++) {
163                 dev = device_handler->devices[i];
164
165                 if (match_fn(dev, str))
166                         return dev;
167         }
168
169         return NULL;
170 }
171
172 struct discover_device *device_lookup_by_name(struct device_handler *handler,
173                 const char *name)
174 {
175         if (!strncmp(name, "/dev/", strlen("/dev/")))
176                 name += strlen("/dev/");
177
178         return device_lookup_by_id(handler, name);
179 }
180
181 struct discover_device *device_lookup_by_uuid(
182                 struct device_handler *device_handler,
183                 const char *uuid)
184 {
185         return device_lookup(device_handler, device_match_uuid, uuid);
186 }
187
188 struct discover_device *device_lookup_by_label(
189                 struct device_handler *device_handler,
190                 const char *label)
191 {
192         return device_lookup(device_handler, device_match_label, label);
193 }
194
195 struct discover_device *device_lookup_by_id(
196                 struct device_handler *device_handler,
197                 const char *id)
198 {
199         return device_lookup(device_handler, device_match_id, id);
200 }
201
202 struct discover_device *device_lookup_by_serial(
203                 struct device_handler *device_handler,
204                 const char *serial)
205 {
206         return device_lookup(device_handler, device_match_serial, serial);
207 }
208
209 void device_handler_destroy(struct device_handler *handler)
210 {
211         talloc_free(handler);
212 }
213
214 static int destroy_device(void *arg)
215 {
216         struct discover_device *dev = arg;
217
218         umount_device(dev);
219
220         return 0;
221 }
222
223 struct discover_device *discover_device_create(struct device_handler *handler,
224                 const char *uuid, const char *id)
225 {
226         struct discover_device *dev;
227
228         if (uuid)
229                 dev = device_lookup_by_uuid(handler, uuid);
230         else
231                 dev = device_lookup_by_id(handler, id);
232
233         if (dev)
234                 return dev;
235
236         dev = talloc_zero(handler, struct discover_device);
237         dev->device = talloc_zero(dev, struct device);
238         dev->device->id = talloc_strdup(dev->device, id);
239         dev->uuid = talloc_strdup(dev, uuid);
240         list_init(&dev->params);
241         list_init(&dev->boot_options);
242
243         talloc_set_destructor(dev, destroy_device);
244
245         return dev;
246 }
247
248 struct discover_device_param {
249         char                    *name;
250         char                    *value;
251         struct list_item        list;
252 };
253
254 void discover_device_set_param(struct discover_device *device,
255                 const char *name, const char *value)
256 {
257         struct discover_device_param *param;
258         bool found = false;
259
260         list_for_each_entry(&device->params, param, list) {
261                 if (!strcmp(param->name, name)) {
262                         found = true;
263                         break;
264                 }
265         }
266
267         if (!found) {
268                 if (!value)
269                         return;
270                 param = talloc(device, struct discover_device_param);
271                 param->name = talloc_strdup(param, name);
272                 list_add(&device->params, &param->list);
273         } else {
274                 if (!value) {
275                         list_remove(&param->list);
276                         talloc_free(param);
277                         return;
278                 }
279                 talloc_free(param->value);
280         }
281
282         param->value = talloc_strdup(param, value);
283 }
284
285 const char *discover_device_get_param(struct discover_device *device,
286                 const char *name)
287 {
288         struct discover_device_param *param;
289
290         list_for_each_entry(&device->params, param, list) {
291                 if (!strcmp(param->name, name))
292                         return param->value;
293         }
294         return NULL;
295 }
296
297 struct device_handler *device_handler_init(struct discover_server *server,
298                 struct waitset *waitset, int dry_run)
299 {
300         struct device_handler *handler;
301         int rc;
302
303         handler = talloc_zero(NULL, struct device_handler);
304         handler->server = server;
305         handler->waitset = waitset;
306         handler->dry_run = dry_run;
307         handler->autoboot_enabled = config_get()->autoboot_enabled;
308
309         list_init(&handler->unresolved_boot_options);
310
311         /* set up our mount point base */
312         pb_mkdir_recursive(mount_base());
313
314         parser_init();
315
316         if (config_get()->safe_mode)
317                 return handler;
318
319         rc = device_handler_init_sources(handler);
320         if (rc) {
321                 talloc_free(handler);
322                 return NULL;
323         }
324
325         return handler;
326 }
327
328 void device_handler_reinit(struct device_handler *handler)
329 {
330         struct discover_boot_option *opt, *tmp;
331         struct ramdisk_device *ramdisk;
332         unsigned int i;
333
334         device_handler_cancel_default(handler);
335
336         /* free unresolved boot options */
337         list_for_each_entry_safe(&handler->unresolved_boot_options,
338                         opt, tmp, list)
339                 talloc_free(opt);
340         list_init(&handler->unresolved_boot_options);
341
342         /* drop all devices */
343         for (i = 0; i < handler->n_devices; i++) {
344                 discover_server_notify_device_remove(handler->server,
345                                 handler->devices[i]->device);
346                 ramdisk = handler->devices[i]->ramdisk;
347                 talloc_free(handler->devices[i]);
348                 talloc_free(ramdisk);
349         }
350
351         talloc_free(handler->devices);
352         handler->devices = NULL;
353         handler->n_devices = 0;
354         talloc_free(handler->ramdisks);
355         handler->ramdisks = NULL;
356         handler->n_ramdisks = 0;
357
358         device_handler_reinit_sources(handler);
359 }
360
361 void device_handler_remove(struct device_handler *handler,
362                 struct discover_device *device)
363 {
364         struct discover_boot_option *opt, *tmp;
365         unsigned int i;
366
367         list_for_each_entry_safe(&device->boot_options, opt, tmp, list) {
368                 if (opt == handler->default_boot_option) {
369                         pb_log("Default option %s cancelled since device removed",
370                                         opt->option->name);
371                         device_handler_cancel_default(handler);
372                         break;
373                 }
374         }
375
376         for (i = 0; i < handler->n_devices; i++)
377                 if (handler->devices[i] == device)
378                         break;
379
380         if (i == handler->n_devices) {
381                 talloc_free(device);
382                 return;
383         }
384
385         /* Free any unresolved options, as they're currently allocated
386          * against the handler */
387         list_for_each_entry_safe(&handler->unresolved_boot_options,
388                         opt, tmp, list) {
389                 if (opt->device != device)
390                         continue;
391                 list_remove(&opt->list);
392                 talloc_free(opt);
393         }
394
395         /* if this is a network device, we have to unregister it from the
396          * network code */
397         if (device->device->type == DEVICE_TYPE_NETWORK)
398                 network_unregister_device(handler->network, device);
399
400         handler->n_devices--;
401         memmove(&handler->devices[i], &handler->devices[i + 1],
402                 (handler->n_devices - i) * sizeof(handler->devices[0]));
403         handler->devices = talloc_realloc(handler, handler->devices,
404                 struct discover_device *, handler->n_devices);
405
406         if (device->notified)
407                 discover_server_notify_device_remove(handler->server,
408                                                         device->device);
409
410         talloc_free(device);
411 }
412
413 void device_handler_status(struct device_handler *handler,
414                 struct status *status)
415 {
416         discover_server_notify_boot_status(handler->server, status);
417 }
418
419 static void _device_handler_vstatus(struct device_handler *handler,
420                 enum status_type type, const char *fmt, va_list ap)
421 {
422         struct status status;
423
424         status.type = type;
425         status.message = talloc_vasprintf(handler, fmt, ap);
426
427         device_handler_status(handler, &status);
428
429         talloc_free(status.message);
430 }
431
432 void device_handler_status_info(struct device_handler *handler,
433                 const char *fmt, ...)
434 {
435         va_list ap;
436
437         va_start(ap, fmt);
438         _device_handler_vstatus(handler, STATUS_INFO, fmt, ap);
439         va_end(ap);
440 }
441
442 void device_handler_status_err(struct device_handler *handler,
443                 const char *fmt, ...)
444 {
445         va_list ap;
446
447         va_start(ap, fmt);
448         _device_handler_vstatus(handler, STATUS_ERROR, fmt, ap);
449         va_end(ap);
450 }
451
452 static void device_handler_boot_status_cb(void *arg, struct status *status)
453 {
454         device_handler_status(arg, status);
455 }
456
457 static void countdown_status(struct device_handler *handler,
458                 struct discover_boot_option *opt, unsigned int sec)
459 {
460         struct status status;
461
462         status.type = STATUS_INFO;
463         status.message = talloc_asprintf(handler,
464                         _("Booting in %d sec: %s"), sec, opt->option->name);
465
466         device_handler_status(handler, &status);
467
468         talloc_free(status.message);
469 }
470
471 static int default_timeout(void *arg)
472 {
473         struct device_handler *handler = arg;
474         struct discover_boot_option *opt;
475
476         if (!handler->default_boot_option)
477                 return 0;
478
479         if (handler->pending_boot)
480                 return 0;
481
482         opt = handler->default_boot_option;
483
484         if (handler->sec_to_boot) {
485                 countdown_status(handler, opt, handler->sec_to_boot);
486                 handler->sec_to_boot--;
487                 handler->timeout_waiter = waiter_register_timeout(
488                                                 handler->waitset, 1000,
489                                                 default_timeout, handler);
490                 return 0;
491         }
492
493         handler->timeout_waiter = NULL;
494
495         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
496
497         platform_pre_boot();
498
499         handler->pending_boot = boot(handler, handler->default_boot_option,
500                         NULL, handler->dry_run, device_handler_boot_status_cb,
501                         handler);
502         handler->pending_boot_is_default = true;
503         return 0;
504 }
505
506 struct {
507         enum ipmi_bootdev       ipmi_type;
508         enum device_type        device_type;
509 } device_type_map[] = {
510         { IPMI_BOOTDEV_NETWORK, DEVICE_TYPE_NETWORK },
511         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_DISK },
512         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_USB },
513         { IPMI_BOOTDEV_CDROM, DEVICE_TYPE_OPTICAL },
514 };
515
516 static bool ipmi_device_type_matches(enum ipmi_bootdev ipmi_type,
517                 enum device_type device_type)
518 {
519         unsigned int i;
520
521         for (i = 0; i < ARRAY_SIZE(device_type_map); i++) {
522                 if (device_type_map[i].device_type == device_type)
523                         return device_type_map[i].ipmi_type == ipmi_type;
524         }
525
526         return false;
527 }
528
529 static int autoboot_option_priority(const struct config *config,
530                                 struct discover_boot_option *opt)
531 {
532         enum device_type type = opt->device->device->type;
533         const char *uuid = opt->device->uuid;
534         struct autoboot_option *auto_opt;
535         unsigned int i;
536
537         for (i = 0; i < config->n_autoboot_opts; i++) {
538                 auto_opt = &config->autoboot_opts[i];
539                 if (auto_opt->boot_type == BOOT_DEVICE_UUID)
540                         if (!strcmp(auto_opt->uuid, uuid))
541                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
542
543                 if (auto_opt->boot_type == BOOT_DEVICE_TYPE)
544                         if (auto_opt->type == type ||
545                             auto_opt->type == DEVICE_TYPE_ANY)
546                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
547         }
548
549         return -1;
550 }
551
552 /*
553  * We have different priorities to resolve conflicts between boot options that
554  * report to be the default for their device. This function assigns a priority
555  * for these options.
556  */
557 static enum default_priority default_option_priority(
558                 struct discover_boot_option *opt)
559 {
560         const struct config *config;
561
562         config = config_get();
563
564         /* We give highest priority to IPMI-configured boot options. If
565          * we have an IPMI bootdev configuration set, then we don't allow
566          * any other defaults */
567         if (config->ipmi_bootdev) {
568                 bool ipmi_match = ipmi_device_type_matches(config->ipmi_bootdev,
569                                 opt->device->device->type);
570                 if (ipmi_match)
571                         return DEFAULT_PRIORITY_REMOTE;
572
573                 pb_debug("handler: disabled default priority due to "
574                                 "non-matching IPMI type %x\n",
575                                 config->ipmi_bootdev);
576                 return DEFAULT_PRIORITY_DISABLED;
577         }
578
579         /* Next, try to match the option against the user-defined autoboot
580          * options, either by device UUID or type. */
581         if (config->n_autoboot_opts) {
582                 int boot_match = autoboot_option_priority(config, opt);
583                 if (boot_match > 0)
584                         return boot_match;
585         }
586
587         /* If the option didn't match any entry in the array, it is disabled */
588         pb_debug("handler: disabled default priority due to "
589                         "non-matching UUID or type\n");
590         return DEFAULT_PRIORITY_DISABLED;
591 }
592
593 static void set_default(struct device_handler *handler,
594                 struct discover_boot_option *opt)
595 {
596         enum default_priority cur_prio, new_prio;
597
598         if (!handler->autoboot_enabled)
599                 return;
600
601         pb_debug("handler: new default option: %s\n", opt->option->id);
602
603         new_prio = default_option_priority(opt);
604
605         /* Anything outside our range prevents a default boot */
606         if (new_prio >= DEFAULT_PRIORITY_DISABLED)
607                 return;
608
609         pb_debug("handler: calculated priority %d\n", new_prio);
610
611         /* Resolve any conflicts: if we have a new default option, it only
612          * replaces the current if it has a higher priority. */
613         if (handler->default_boot_option) {
614
615                 cur_prio = handler->default_boot_option_priority;
616
617                 if (new_prio < cur_prio) {
618                         pb_log("handler: new prio %d beats "
619                                         "old prio %d for %s\n",
620                                         new_prio, cur_prio,
621                                         handler->default_boot_option
622                                                 ->option->id);
623                         handler->default_boot_option = opt;
624                         handler->default_boot_option_priority = new_prio;
625                         /* extend the timeout a little, so the user sees some
626                          * indication of the change */
627                         handler->sec_to_boot += 2;
628                 }
629
630                 return;
631         }
632
633         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
634         handler->default_boot_option = opt;
635         handler->default_boot_option_priority = new_prio;
636
637         pb_log("handler: boot option %s set as default, timeout %u sec.\n",
638                opt->option->id, handler->sec_to_boot);
639
640         default_timeout(handler);
641 }
642
643 static bool resource_is_resolved(struct resource *res)
644 {
645         return !res || res->resolved;
646 }
647
648 /* We only use this in an assert, which will disappear if we're compiling
649  * with NDEBUG, so we need the 'used' attribute for these builds */
650 static bool __attribute__((used)) boot_option_is_resolved(
651                 struct discover_boot_option *opt)
652 {
653         return resource_is_resolved(opt->boot_image) &&
654                 resource_is_resolved(opt->initrd) &&
655                 resource_is_resolved(opt->dtb) &&
656                 resource_is_resolved(opt->args_sig_file) &&
657                 resource_is_resolved(opt->icon);
658 }
659
660 static bool resource_resolve(struct resource *res, const char *name,
661                 struct discover_boot_option *opt,
662                 struct device_handler *handler)
663 {
664         struct parser *parser = opt->source;
665
666         if (resource_is_resolved(res))
667                 return true;
668
669         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
670                         opt->option->id, name, parser->name);
671         parser->resolve_resource(handler, res);
672
673         return res->resolved;
674 }
675
676 static bool boot_option_resolve(struct discover_boot_option *opt,
677                 struct device_handler *handler)
678 {
679         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
680                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
681                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
682                 resource_resolve(opt->args_sig_file, "args_sig_file", opt,
683                         handler) &&
684                 resource_resolve(opt->icon, "icon", opt, handler);
685 }
686
687 static void boot_option_finalise(struct device_handler *handler,
688                 struct discover_boot_option *opt)
689 {
690         assert(boot_option_is_resolved(opt));
691
692         /* check that the parsers haven't set any of the final data */
693         assert(!opt->option->boot_image_file);
694         assert(!opt->option->initrd_file);
695         assert(!opt->option->dtb_file);
696         assert(!opt->option->icon_file);
697         assert(!opt->option->device_id);
698         assert(!opt->option->args_sig_file);
699
700         if (opt->boot_image)
701                 opt->option->boot_image_file = opt->boot_image->url->full;
702         if (opt->initrd)
703                 opt->option->initrd_file = opt->initrd->url->full;
704         if (opt->dtb)
705                 opt->option->dtb_file = opt->dtb->url->full;
706         if (opt->icon)
707                 opt->option->icon_file = opt->icon->url->full;
708         if (opt->args_sig_file)
709                 opt->option->args_sig_file = opt->args_sig_file->url->full;
710
711         opt->option->device_id = opt->device->device->id;
712
713         if (opt->option->is_default)
714                 set_default(handler, opt);
715 }
716
717 static void notify_boot_option(struct device_handler *handler,
718                 struct discover_boot_option *opt)
719 {
720         struct discover_device *dev = opt->device;
721
722         if (!dev->notified)
723                 discover_server_notify_device_add(handler->server,
724                                                   opt->device->device);
725         dev->notified = true;
726         discover_server_notify_boot_option_add(handler->server, opt->option);
727 }
728
729 static void process_boot_option_queue(struct device_handler *handler)
730 {
731         struct discover_boot_option *opt, *tmp;
732
733         list_for_each_entry_safe(&handler->unresolved_boot_options,
734                         opt, tmp, list) {
735
736                 pb_debug("queue: attempting resolution for %s\n",
737                                 opt->option->id);
738
739                 if (!boot_option_resolve(opt, handler))
740                         continue;
741
742                 pb_debug("\tresolved!\n");
743
744                 list_remove(&opt->list);
745                 list_add_tail(&opt->device->boot_options, &opt->list);
746                 talloc_steal(opt->device, opt);
747                 boot_option_finalise(handler, opt);
748                 notify_boot_option(handler, opt);
749         }
750 }
751
752 struct discover_context *device_handler_discover_context_create(
753                 struct device_handler *handler,
754                 struct discover_device *device)
755 {
756         struct discover_context *ctx;
757
758         ctx = talloc_zero(handler, struct discover_context);
759         ctx->device = device;
760         ctx->network = handler->network;
761         list_init(&ctx->boot_options);
762
763         return ctx;
764 }
765
766 void device_handler_add_device(struct device_handler *handler,
767                 struct discover_device *device)
768 {
769         handler->n_devices++;
770         handler->devices = talloc_realloc(handler, handler->devices,
771                                 struct discover_device *, handler->n_devices);
772         handler->devices[handler->n_devices - 1] = device;
773
774         if (device->device->type == DEVICE_TYPE_NETWORK)
775                 network_register_device(handler->network, device);
776 }
777
778 void device_handler_add_ramdisk(struct device_handler *handler,
779                 const char *path)
780 {
781         struct ramdisk_device *dev;
782         unsigned int i;
783
784         if (!path)
785                 return;
786
787         for (i = 0; i < handler->n_ramdisks; i++)
788                 if (!strcmp(handler->ramdisks[i]->path, path))
789                         return;
790
791         dev = talloc_zero(handler, struct ramdisk_device);
792         if (!dev) {
793                 pb_log("Failed to allocate memory to track %s\n", path);
794                 return;
795         }
796
797         dev->path = talloc_strdup(handler, path);
798
799         handler->ramdisks = talloc_realloc(handler, handler->ramdisks,
800                                 struct ramdisk_device *,
801                                 handler->n_ramdisks + 1);
802         if (!handler->ramdisks) {
803                 pb_log("Failed to reallocate memory"
804                        "- ramdisk tracking inconsistent!\n");
805                 return;
806         }
807
808         handler->ramdisks[i] = dev;
809         i = handler->n_ramdisks++;
810 }
811
812 struct ramdisk_device *device_handler_get_ramdisk(
813                 struct device_handler *handler)
814 {
815         unsigned int i;
816         char *name;
817         dev_t id;
818
819         /* Check if free ramdisk exists */
820         for (i = 0; i < handler->n_ramdisks; i++)
821                 if (!handler->ramdisks[i]->snapshot &&
822                     !handler->ramdisks[i]->origin &&
823                     !handler->ramdisks[i]->base)
824                         return handler->ramdisks[i];
825
826         /* Otherwise create a new one */
827         name = talloc_asprintf(handler, "/dev/ram%d",
828                         handler->n_ramdisks);
829         if (!name) {
830                 pb_debug("Failed to allocate memory to name /dev/ram%d",
831                         handler->n_ramdisks);
832                 return NULL;
833         }
834
835         id = makedev(1, handler->n_ramdisks);
836         if (mknod(name, S_IFBLK, id)) {
837                 if (errno == EEXIST) {
838                         /* We haven't yet received updates for existing
839                          * ramdisks - add and use this one */
840                         pb_debug("Using untracked ramdisk %s\n", name);
841                 } else {
842                         pb_log("Failed to create new ramdisk %s: %s\n",
843                                name, strerror(errno));
844                         return NULL;
845                 }
846         }
847         device_handler_add_ramdisk(handler, name);
848         talloc_free(name);
849
850         return handler->ramdisks[i];
851 }
852
853 void device_handler_release_ramdisk(struct discover_device *device)
854 {
855         struct ramdisk_device *ramdisk = device->ramdisk;
856
857         talloc_free(ramdisk->snapshot);
858         talloc_free(ramdisk->origin);
859         talloc_free(ramdisk->base);
860
861         ramdisk->snapshot = ramdisk->origin = ramdisk->base = NULL;
862         ramdisk->sectors = 0;
863
864         device->ramdisk = NULL;
865 }
866
867 /* Start discovery on a hotplugged device. The device will be in our devices
868  * array, but has only just been initialised by the hotplug source.
869  */
870 int device_handler_discover(struct device_handler *handler,
871                 struct discover_device *dev)
872 {
873         struct discover_context *ctx;
874         int rc;
875
876         /*
877          * TRANSLATORS: this string will be passed the type and identifier
878          * of the device. For example, the first parameter could be "Disk",
879          * (which will be translated accordingly) and the second a Linux device
880          * identifier like 'sda1' (which will not be translated)
881          */
882         device_handler_status_info(handler, _("Processing %s device %s"),
883                                 device_type_display_name(dev->device->type),
884                                 dev->device->id);
885
886         process_boot_option_queue(handler);
887
888         /* create our context */
889         ctx = device_handler_discover_context_create(handler, dev);
890
891         rc = mount_device(dev);
892         if (rc)
893                 goto out;
894
895         /* add this device to our system info */
896         system_info_register_blockdev(dev->device->id, dev->uuid,
897                         dev->mount_path);
898
899         /* run the parsers. This will populate the ctx's boot_option list. */
900         iterate_parsers(ctx);
901
902         /* add discovered stuff to the handler */
903         device_handler_discover_context_commit(handler, ctx);
904
905 out:
906         /*
907          * TRANSLATORS: the format specifier in this string is a Linux
908          * device identifier, like 'sda1'
909          */
910         device_handler_status_info(handler, _("Processing %s complete"),
911                                 dev->device->id);
912
913         talloc_unlink(handler, ctx);
914
915         return 0;
916 }
917
918 /* Incoming dhcp event */
919 int device_handler_dhcp(struct device_handler *handler,
920                 struct discover_device *dev, struct event *event)
921 {
922         struct discover_context *ctx;
923
924         /*
925          * TRANSLATORS: this format specifier will be the name of a network
926          * device, like 'eth0'.
927          */
928         device_handler_status_info(handler, _("Processing dhcp event on %s"),
929                                 dev->device->id);
930
931         /* create our context */
932         ctx = device_handler_discover_context_create(handler, dev);
933         talloc_steal(ctx, event);
934         ctx->event = event;
935
936         iterate_parsers(ctx);
937
938         device_handler_discover_context_commit(handler, ctx);
939
940         /*
941          * TRANSLATORS: this format specifier will be the name of a network
942          * device, like 'eth0'.
943          */
944         device_handler_status_info(handler, _("Processing %s complete"),
945                                 dev->device->id);
946
947         talloc_unlink(handler, ctx);
948
949         return 0;
950 }
951
952 static struct discover_boot_option *find_boot_option_by_id(
953                 struct device_handler *handler, const char *id)
954 {
955         unsigned int i;
956
957         for (i = 0; i < handler->n_devices; i++) {
958                 struct discover_device *dev = handler->devices[i];
959                 struct discover_boot_option *opt;
960
961                 list_for_each_entry(&dev->boot_options, opt, list)
962                         if (!strcmp(opt->option->id, id))
963                                 return opt;
964         }
965
966         return NULL;
967 }
968
969 void device_handler_boot(struct device_handler *handler,
970                 struct boot_command *cmd)
971 {
972         struct discover_boot_option *opt = NULL;
973
974         if (cmd->option_id && strlen(cmd->option_id))
975                 opt = find_boot_option_by_id(handler, cmd->option_id);
976
977         if (handler->pending_boot)
978                 boot_cancel(handler->pending_boot);
979
980         platform_pre_boot();
981
982         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
983                         device_handler_boot_status_cb, handler);
984         handler->pending_boot_is_default = false;
985 }
986
987 void device_handler_cancel_default(struct device_handler *handler)
988 {
989         if (handler->timeout_waiter)
990                 waiter_remove(handler->timeout_waiter);
991
992         handler->timeout_waiter = NULL;
993         handler->autoboot_enabled = false;
994
995         /* we only send status if we had a default boot option queued */
996         if (!handler->default_boot_option)
997                 return;
998
999         pb_log("Cancelling default boot option\n");
1000
1001         if (handler->pending_boot && handler->pending_boot_is_default) {
1002                 boot_cancel(handler->pending_boot);
1003                 handler->pending_boot = NULL;
1004                 handler->pending_boot_is_default = false;
1005         }
1006
1007         handler->default_boot_option = NULL;
1008
1009         device_handler_status_info(handler, _("Default boot cancelled"));
1010 }
1011
1012 void device_handler_update_config(struct device_handler *handler,
1013                 struct config *config)
1014 {
1015         int rc;
1016
1017         rc = config_set(config);
1018         if (rc)
1019                 return;
1020
1021         discover_server_notify_config(handler->server, config);
1022         device_handler_update_lang(config->lang);
1023         device_handler_reinit(handler);
1024 }
1025
1026 static char *device_from_addr(void *ctx, struct pb_url *url)
1027 {
1028         char *ipaddr, *buf, *tok, *dev = NULL;
1029         const char *delim = " ";
1030         struct sockaddr_in *ip;
1031         struct sockaddr_in si;
1032         struct addrinfo *res;
1033         struct process *p;
1034         int rc;
1035
1036         /* Note: IPv4 only */
1037         rc = inet_pton(AF_INET, url->host, &(si.sin_addr));
1038         if (rc > 0) {
1039                 ipaddr = url->host;
1040         } else {
1041                 /* need to turn hostname into a valid IP */
1042                 rc = getaddrinfo(url->host, NULL, NULL, &res);
1043                 if (rc) {
1044                         pb_debug("%s: Invalid URL\n",__func__);
1045                         return NULL;
1046                 }
1047                 ipaddr = talloc_array(ctx,char,INET_ADDRSTRLEN);
1048                 ip = (struct sockaddr_in *) res->ai_addr;
1049                 inet_ntop(AF_INET, &(ip->sin_addr), ipaddr, INET_ADDRSTRLEN);
1050                 freeaddrinfo(res);
1051         }
1052
1053         const char *argv[] = {
1054                 pb_system_apps.ip,
1055                 "route", "show", "to", "match",
1056                 ipaddr,
1057                 NULL
1058         };
1059
1060         p = process_create(ctx);
1061
1062         p->path = pb_system_apps.ip;
1063         p->argv = argv;
1064         p->keep_stdout = true;
1065
1066         rc = process_run_sync(p);
1067
1068         if (rc || p->exit_status) {
1069                 /* ip has complained for some reason; most likely
1070                  * there is no route to the host - bail out */
1071                 pb_debug("%s: `ip` returns non-zero exit status\n", __func__);
1072                 pb_debug("ip buf: %s\n", p->stdout_buf);
1073                 process_release(p);
1074                 return NULL;
1075         }
1076
1077         buf = p->stdout_buf;
1078         /* If a route is found, ip-route output will be of the form
1079          * "... dev DEVNAME ... " */
1080         tok = strtok(buf, delim);
1081         while (tok) {
1082                 if (!strcmp(tok, "dev")) {
1083                         tok = strtok(NULL, delim);
1084                         dev = talloc_strdup(ctx, tok);
1085                         break;
1086                 }
1087                 tok = strtok(NULL, delim);
1088         }
1089
1090         process_release(p);
1091         if (dev)
1092                 pb_debug("%s: Found interface '%s'\n", __func__,dev);
1093         return dev;
1094 }
1095
1096 void device_handler_process_url(struct device_handler *handler,
1097                 const char *url, const char *mac, const char *ip)
1098 {
1099         struct discover_context *ctx;
1100         struct discover_device *dev;
1101         struct pb_url *pb_url;
1102         struct event *event;
1103         struct param *param;
1104
1105         if (!handler->network) {
1106                 device_handler_status_err(handler, _("No network configured"));
1107                 return;
1108         }
1109
1110         event = talloc(handler, struct event);
1111         event->type = EVENT_TYPE_USER;
1112         event->action = EVENT_ACTION_URL;
1113
1114         if (url[strlen(url) - 1] == '/') {
1115                 event->params = talloc_array(event, struct param, 3);
1116                 param = &event->params[0];
1117                 param->name = talloc_strdup(event, "pxepathprefix");
1118                 param->value = talloc_strdup(event, url);
1119                 param = &event->params[1];
1120                 param->name = talloc_strdup(event, "mac");
1121                 param->value = talloc_strdup(event, mac);
1122                 param = &event->params[2];
1123                 param->name = talloc_strdup(event, "ip");
1124                 param->value = talloc_strdup(event, ip);
1125                 event->n_params = 3;
1126         } else {
1127                 event->params = talloc_array(event, struct param, 1);
1128                 param = &event->params[0];
1129                 param->name = talloc_strdup(event, "pxeconffile");
1130                 param->value = talloc_strdup(event, url);
1131                 event->n_params = 1;
1132         }
1133
1134         pb_url = pb_url_parse(event, event->params->value);
1135         if (!pb_url || (pb_url->scheme != pb_url_file && !pb_url->host)) {
1136                 device_handler_status_err(handler, _("Invalid config URL!"));
1137                 return;
1138         }
1139
1140         if (pb_url->scheme == pb_url_file)
1141                 event->device = talloc_asprintf(event, "local");
1142         else
1143                 event->device = device_from_addr(event, pb_url);
1144
1145         if (!event->device) {
1146                 device_handler_status_err(handler,
1147                                         _("Unable to route to host %s"),
1148                                         pb_url->host);
1149                 return;
1150         }
1151
1152         dev = discover_device_create(handler, mac, event->device);
1153         if (pb_url->scheme == pb_url_file)
1154                 dev->device->type = DEVICE_TYPE_ANY;
1155         ctx = device_handler_discover_context_create(handler, dev);
1156         talloc_steal(ctx, event);
1157         ctx->event = event;
1158
1159         iterate_parsers(ctx);
1160
1161         device_handler_discover_context_commit(handler, ctx);
1162
1163         talloc_unlink(handler, ctx);
1164 }
1165
1166 #ifndef PETITBOOT_TEST
1167
1168 /**
1169  * context_commit - Commit a temporary discovery context to the handler,
1170  * and notify the clients about any new options / devices
1171  */
1172 void device_handler_discover_context_commit(struct device_handler *handler,
1173                 struct discover_context *ctx)
1174 {
1175         struct discover_device *dev = ctx->device;
1176         struct discover_boot_option *opt, *tmp;
1177
1178         if (!device_lookup_by_uuid(handler, dev->uuid))
1179                 device_handler_add_device(handler, dev);
1180
1181         /* move boot options from the context to the device */
1182         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
1183                 list_remove(&opt->list);
1184
1185                 /* All boot options need at least a kernel image */
1186                 if (!opt->boot_image || !opt->boot_image->url) {
1187                         pb_log("boot option %s is missing boot image, ignoring\n",
1188                                 opt->option->id);
1189                         talloc_free(opt);
1190                         continue;
1191                 }
1192
1193                 if (boot_option_resolve(opt, handler)) {
1194                         pb_log("boot option %s is resolved, "
1195                                         "sending to clients\n",
1196                                         opt->option->id);
1197                         list_add_tail(&dev->boot_options, &opt->list);
1198                         talloc_steal(dev, opt);
1199                         boot_option_finalise(handler, opt);
1200                         notify_boot_option(handler, opt);
1201                 } else {
1202                         if (!opt->source->resolve_resource) {
1203                                 pb_log("parser %s gave us an unresolved "
1204                                         "resource (%s), but no way to "
1205                                         "resolve it\n",
1206                                         opt->source->name, opt->option->id);
1207                                 talloc_free(opt);
1208                         } else {
1209                                 pb_log("boot option %s is unresolved, "
1210                                                 "adding to queue\n",
1211                                                 opt->option->id);
1212                                 list_add(&handler->unresolved_boot_options,
1213                                                 &opt->list);
1214                                 talloc_steal(handler, opt);
1215                         }
1216                 }
1217         }
1218 }
1219
1220 static void device_handler_update_lang(const char *lang)
1221 {
1222         const char *cur_lang;
1223
1224         if (!lang)
1225                 return;
1226
1227         cur_lang = setlocale(LC_ALL, NULL);
1228         if (cur_lang && !strcmp(cur_lang, lang))
1229                 return;
1230
1231         setlocale(LC_ALL, lang);
1232 }
1233
1234 static int device_handler_init_sources(struct device_handler *handler)
1235 {
1236         /* init our device sources: udev, network and user events */
1237         handler->udev = udev_init(handler, handler->waitset);
1238         if (!handler->udev)
1239                 return -1;
1240
1241         handler->network = network_init(handler, handler->waitset,
1242                         handler->dry_run);
1243         if (!handler->network)
1244                 return -1;
1245
1246         handler->user_event = user_event_init(handler, handler->waitset);
1247         if (!handler->user_event)
1248                 return -1;
1249
1250         return 0;
1251 }
1252
1253 static void device_handler_reinit_sources(struct device_handler *handler)
1254 {
1255         /* if we haven't initialised sources previously (becuase we started in
1256          * safe mode), then init once here. */
1257         if (!(handler->udev || handler->network || handler->user_event)) {
1258                 device_handler_init_sources(handler);
1259                 return;
1260         }
1261
1262         udev_reinit(handler->udev);
1263
1264         network_shutdown(handler->network);
1265         handler->network = network_init(handler, handler->waitset,
1266                         handler->dry_run);
1267 }
1268
1269 static inline const char *get_device_path(struct discover_device *dev)
1270 {
1271         return dev->ramdisk ? dev->ramdisk->snapshot : dev->device_path;
1272 }
1273
1274 static char *check_subvols(struct discover_device *dev)
1275 {
1276         const char *fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1277         struct stat sb;
1278         char *path;
1279         int rc;
1280
1281         if (strncmp(fstype, "btrfs", strlen("btrfs")))
1282                 return dev->mount_path;
1283
1284         /* On btrfs a device's root may be under a subvolume path */
1285         path = join_paths(dev, dev->mount_path, "@");
1286         rc = stat(path, &sb);
1287         if (!rc && S_ISDIR(sb.st_mode)) {
1288                 pb_debug("Using '%s' for btrfs root path\n", path);
1289                 return path;
1290         }
1291
1292         talloc_free(path);
1293         return dev->mount_path;
1294 }
1295
1296 static bool check_existing_mount(struct discover_device *dev)
1297 {
1298         struct stat devstat, mntstat;
1299         const char *device_path;
1300         struct mntent *mnt;
1301         FILE *fp;
1302         int rc;
1303
1304         device_path = get_device_path(dev);
1305
1306         rc = stat(device_path, &devstat);
1307         if (rc) {
1308                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
1309                 return false;
1310         }
1311
1312         if (!S_ISBLK(devstat.st_mode)) {
1313                 pb_debug("%s: %s isn't a block device?\n", __func__,
1314                                 dev->device_path);
1315                 return false;
1316         }
1317
1318         fp = fopen("/proc/self/mounts", "r");
1319
1320         for (;;) {
1321                 mnt = getmntent(fp);
1322                 if (!mnt)
1323                         break;
1324
1325                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
1326                         continue;
1327
1328                 rc = stat(mnt->mnt_fsname, &mntstat);
1329                 if (rc)
1330                         continue;
1331
1332                 if (!S_ISBLK(mntstat.st_mode))
1333                         continue;
1334
1335                 if (mntstat.st_rdev == devstat.st_rdev) {
1336                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
1337                         dev->root_path = check_subvols(dev);
1338                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
1339                         dev->mounted = true;
1340                         dev->unmount = false;
1341
1342                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
1343                                         __func__, dev->device_path,
1344                                         dev->mounted_rw ? 'w' : 'o',
1345                                         mnt->mnt_dir);
1346                         break;
1347                 }
1348         }
1349
1350         fclose(fp);
1351
1352         return mnt != NULL;
1353 }
1354
1355 /*
1356  * Attempt to mount a filesystem safely, while handling certain filesytem-
1357  * specific options
1358  */
1359 static int try_mount(const char *device_path, const char *mount_path,
1360                              const char *fstype, unsigned long flags,
1361                              bool have_snapshot)
1362 {
1363         const char *fs, *safe_opts;
1364         int rc;
1365
1366         /* Mount ext3 as ext4 instead so 'norecovery' can be used */
1367         if (strncmp(fstype, "ext3", strlen("ext3")) == 0) {
1368                 pb_debug("Mounting ext3 filesystem as ext4\n");
1369                 fs = "ext4";
1370         } else
1371                 fs = fstype;
1372
1373         if (strncmp(fs, "xfs", strlen("xfs")) == 0 ||
1374             strncmp(fs, "ext4", strlen("ext4")) == 0)
1375                 safe_opts = "norecovery";
1376         else
1377                 safe_opts = NULL;
1378
1379         errno = 0;
1380         /* If no snapshot is available don't attempt recovery */
1381         if (!have_snapshot)
1382                 return mount(device_path, mount_path, fs, flags, safe_opts);
1383
1384         rc = mount(device_path, mount_path, fs, flags, NULL);
1385
1386         if (!rc)
1387                 return rc;
1388
1389         /* Mounting failed; some filesystems will fail to mount if a recovery
1390          * journal exists (eg. cross-endian XFS), so try again with norecovery
1391          * where that option is available.
1392          * If mounting read-write just return the error as norecovery is not a
1393          * valid option */
1394         if ((flags & MS_RDONLY) != MS_RDONLY || !safe_opts)
1395                 return rc;
1396
1397         errno = 0;
1398         return mount(device_path, mount_path, fs, flags, safe_opts);
1399 }
1400
1401 static int mount_device(struct discover_device *dev)
1402 {
1403         const char *fstype, *device_path;
1404         int rc;
1405
1406         if (!dev->device_path)
1407                 return -1;
1408
1409         if (dev->mounted)
1410                 return 0;
1411
1412         if (check_existing_mount(dev))
1413                 return 0;
1414
1415         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1416         if (!fstype)
1417                 return 0;
1418
1419         dev->mount_path = join_paths(dev, mount_base(),
1420                                         dev->device_path);
1421
1422         if (pb_mkdir_recursive(dev->mount_path)) {
1423                 pb_log("couldn't create mount directory %s: %s\n",
1424                                 dev->mount_path, strerror(errno));
1425                 goto err_free;
1426         }
1427
1428         device_path = get_device_path(dev);
1429
1430         pb_log("mounting device %s read-only\n", dev->device_path);
1431         rc = try_mount(device_path, dev->mount_path, fstype,
1432                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1433
1434         if (!rc) {
1435                 dev->mounted = true;
1436                 dev->mounted_rw = false;
1437                 dev->unmount = true;
1438                 dev->root_path = check_subvols(dev);
1439                 return 0;
1440         }
1441
1442         pb_log("couldn't mount device %s: mount failed: %s\n",
1443                         device_path, strerror(errno));
1444
1445         /* If mount fails clean up any snapshot */
1446         devmapper_destroy_snapshot(dev);
1447
1448         pb_rmdir_recursive(mount_base(), dev->mount_path);
1449 err_free:
1450         talloc_free(dev->mount_path);
1451         dev->mount_path = NULL;
1452         return -1;
1453 }
1454
1455 static int umount_device(struct discover_device *dev)
1456 {
1457         const char *device_path;
1458         int rc;
1459
1460         if (!dev->mounted || !dev->unmount)
1461                 return 0;
1462
1463         device_path = get_device_path(dev);
1464
1465         pb_log("unmounting device %s\n", device_path);
1466         rc = umount(dev->mount_path);
1467         if (rc)
1468                 return -1;
1469
1470         dev->mounted = false;
1471         devmapper_destroy_snapshot(dev);
1472
1473         pb_rmdir_recursive(mount_base(), dev->mount_path);
1474
1475         talloc_free(dev->mount_path);
1476         dev->mount_path = NULL;
1477         dev->root_path = NULL;
1478
1479         return 0;
1480 }
1481
1482 int device_request_write(struct discover_device *dev, bool *release)
1483 {
1484         const char *fstype, *device_path;
1485         const struct config *config;
1486         int rc;
1487
1488         *release = false;
1489
1490         config = config_get();
1491         if (!config->allow_writes)
1492                 return -1;
1493
1494         if (!dev->mounted)
1495                 return -1;
1496
1497         if (dev->mounted_rw)
1498                 return 0;
1499
1500         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1501
1502         device_path = get_device_path(dev);
1503
1504         pb_log("remounting device %s read-write\n", device_path);
1505
1506         rc = umount(dev->mount_path);
1507         if (rc) {
1508                 pb_log("Failed to unmount %s: %s\n",
1509                        dev->mount_path, strerror(errno));
1510                 return -1;
1511         }
1512
1513         rc = try_mount(device_path, dev->mount_path, fstype,
1514                        MS_SILENT, dev->ramdisk);
1515         if (rc)
1516                 goto mount_ro;
1517
1518         dev->mounted_rw = true;
1519         *release = true;
1520         return 0;
1521
1522 mount_ro:
1523         pb_log("Unable to remount device %s read-write: %s\n",
1524                device_path, strerror(errno));
1525         rc = try_mount(device_path, dev->mount_path, fstype,
1526                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1527         if (rc)
1528                 pb_log("Unable to recover mount for %s: %s\n",
1529                        device_path, strerror(errno));
1530         return -1;
1531 }
1532
1533 void device_release_write(struct discover_device *dev, bool release)
1534 {
1535         const char *fstype, *device_path;
1536
1537         if (!release)
1538                 return;
1539
1540         device_path = get_device_path(dev);
1541
1542         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1543
1544         pb_log("remounting device %s read-only\n", device_path);
1545
1546         if (umount(dev->mount_path)) {
1547                 pb_log("Failed to unmount %s\n", dev->mount_path);
1548                 return;
1549         }
1550         dev->mounted_rw = dev->mounted = false;
1551
1552         if (dev->ramdisk) {
1553                 devmapper_merge_snapshot(dev);
1554                 /* device_path becomes stale after merge */
1555                 device_path = get_device_path(dev);
1556         }
1557
1558         if (try_mount(device_path, dev->mount_path, fstype,
1559                        MS_RDONLY | MS_SILENT, dev->ramdisk))
1560                 pb_log("Failed to remount %s read-only: %s\n",
1561                        device_path, strerror(errno));
1562         else
1563                 dev->mounted = true;
1564 }
1565
1566 void device_sync_snapshots(struct device_handler *handler, const char *device)
1567 {
1568         struct discover_device *dev = NULL;
1569         unsigned int i;
1570
1571         if (device) {
1572                 /* Find matching device and sync */
1573                 dev = device_lookup_by_name(handler, device);
1574                 if (!dev) {
1575                         pb_log("%s: device name '%s' unrecognised\n",
1576                                 __func__, device);
1577                         return;
1578                 }
1579                 if (dev->ramdisk)
1580                         device_release_write(dev, true);
1581                 else
1582                         pb_log("%s has no snapshot to merge, skipping\n",
1583                                 dev->device->id);
1584                 return;
1585         }
1586
1587         /* Otherwise sync all relevant devices */
1588         for (i = 0; i < handler->n_devices; i++) {
1589                 dev = handler->devices[i];
1590                 if (dev->device->type != DEVICE_TYPE_DISK &&
1591                         dev->device->type != DEVICE_TYPE_USB)
1592                         continue;
1593                 if (dev->ramdisk)
1594                         device_release_write(dev, true);
1595                 else
1596                         pb_log("%s has no snapshot to merge, skipping\n",
1597                                 dev->device->id);
1598         }
1599 }
1600
1601 #else
1602
1603 void device_handler_discover_context_commit(
1604                 struct device_handler *handler __attribute__((unused)),
1605                 struct discover_context *ctx __attribute__((unused)))
1606 {
1607         pb_log("%s stubbed out for test cases\n", __func__);
1608 }
1609
1610 static void device_handler_update_lang(const char *lang __attribute__((unused)))
1611 {
1612 }
1613
1614 static int device_handler_init_sources(
1615                 struct device_handler *handler __attribute__((unused)))
1616 {
1617         return 0;
1618 }
1619
1620 static void device_handler_reinit_sources(
1621                 struct device_handler *handler __attribute__((unused)))
1622 {
1623 }
1624
1625 static int umount_device(struct discover_device *dev __attribute__((unused)))
1626 {
1627         return 0;
1628 }
1629
1630 static int __attribute__((unused)) mount_device(
1631                 struct discover_device *dev __attribute__((unused)))
1632 {
1633         return 0;
1634 }
1635
1636 int device_request_write(struct discover_device *dev __attribute__((unused)),
1637                 bool *release)
1638 {
1639         *release = true;
1640         return 0;
1641 }
1642
1643 void device_release_write(struct discover_device *dev __attribute__((unused)),
1644         bool release __attribute__((unused)))
1645 {
1646 }
1647
1648 void device_sync_snapshots(
1649                 struct device_handler *handler __attribute__((unused)),
1650                 const char *device __attribute__((unused)))
1651 {
1652 }
1653
1654 #endif