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