src/libsystemd/sd-device/device-private.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <ctype.h>
   4 #include <net/if.h>
   5 #include <sys/types.h>
   6
   7 #include "sd-device.h"
   8
   9 #include "alloc-util.h"
  10 #include "device-internal.h"
  11 #include "device-private.h"
  12 #include "device-util.h"
  13 #include "fd-util.h"
  14 #include "fileio.h"
  15 #include "fs-util.h"
  16 #include "hashmap.h"
  17 #include "macro.h"
  18 #include "mkdir.h"
  19 #include "parse-util.h"
  20 #include "path-util.h"
  21 #include "set.h"
  22 #include "string-table.h"
  23 #include "string-util.h"
  24 #include "strv.h"
  25 #include "strxcpyx.h"
  26 #include "tmpfile-util.h"
  27 #include "user-util.h"
  28 #include "util.h"
  29
  30 int device_add_property(sd_device *device, const char *key, const char *value) {
  31         int r;
  32
  33         assert(device);
  34         assert(key);
  35
  36         r = device_add_property_aux(device, key, value, false);
  37         if (r < 0)
  38                 return r;
  39
  40         if (key[0] != '.') {
  41                 r = device_add_property_aux(device, key, value, true);
  42                 if (r < 0)
  43                         return r;
  44         }
  45
  46         return 0;
  47 }
  48
  49 void device_set_devlink_priority(sd_device *device, int priority) {
  50         assert(device);
  51
  52         device->devlink_priority = priority;
  53 }
  54
  55 void device_set_is_initialized(sd_device *device) {
  56         assert(device);
  57
  58         device->is_initialized = true;
  59 }
  60
  61 int device_ensure_usec_initialized(sd_device *device, sd_device *device_old) {
  62         usec_t when;
  63
  64         assert(device);
  65
  66         if (device_old && device_old->usec_initialized > 0)
  67                 when = device_old->usec_initialized;
  68         else
  69                 when = now(CLOCK_MONOTONIC);
  70
  71         return device_set_usec_initialized(device, when);
  72 }
  73
  74 uint64_t device_get_properties_generation(sd_device *device) {
  75         assert(device);
  76
  77         return device->properties_generation;
  78 }
  79
  80 uint64_t device_get_tags_generation(sd_device *device) {
  81         assert(device);
  82
  83         return device->tags_generation;
  84 }
  85
  86 uint64_t device_get_devlinks_generation(sd_device *device) {
  87         assert(device);
  88
  89         return device->devlinks_generation;
  90 }
  91
  92 int device_get_devnode_mode(sd_device *device, mode_t *mode) {
  93         int r;
  94
  95         assert(device);
  96
  97         r = device_read_db(device);
  98         if (r < 0)
  99                 return r;
 100
 101         if (device->devmode == (mode_t) -1)
 102                 return -ENOENT;
 103
 104         if (mode)
 105                 *mode = device->devmode;
 106
 107         return 0;
 108 }
 109
 110 int device_get_devnode_uid(sd_device *device, uid_t *uid) {
 111         int r;
 112
 113         assert(device);
 114
 115         r = device_read_db(device);
 116         if (r < 0)
 117                 return r;
 118
 119         if (device->devuid == (uid_t) -1)
 120                 return -ENOENT;
 121
 122         if (uid)
 123                 *uid = device->devuid;
 124
 125         return 0;
 126 }
 127
 128 static int device_set_devuid(sd_device *device, const char *uid) {
 129         unsigned u;
 130         int r;
 131
 132         assert(device);
 133         assert(uid);
 134
 135         r = safe_atou(uid, &u);
 136         if (r < 0)
 137                 return r;
 138
 139         r = device_add_property_internal(device, "DEVUID", uid);
 140         if (r < 0)
 141                 return r;
 142
 143         device->devuid = u;
 144
 145         return 0;
 146 }
 147
 148 int device_get_devnode_gid(sd_device *device, gid_t *gid) {
 149         int r;
 150
 151         assert(device);
 152
 153         r = device_read_db(device);
 154         if (r < 0)
 155                 return r;
 156
 157         if (device->devgid == (gid_t) -1)
 158                 return -ENOENT;
 159
 160         if (gid)
 161                 *gid = device->devgid;
 162
 163         return 0;
 164 }
 165
 166 static int device_set_devgid(sd_device *device, const char *gid) {
 167         unsigned g;
 168         int r;
 169
 170         assert(device);
 171         assert(gid);
 172
 173         r = safe_atou(gid, &g);
 174         if (r < 0)
 175                 return r;
 176
 177         r = device_add_property_internal(device, "DEVGID", gid);
 178         if (r < 0)
 179                 return r;
 180
 181         device->devgid = g;
 182
 183         return 0;
 184 }
 185
 186 int device_get_action(sd_device *device, DeviceAction *action) {
 187         assert(device);
 188
 189         if (device->action < 0)
 190                 return -ENOENT;
 191
 192         if (action)
 193                 *action = device->action;
 194
 195         return 0;
 196 }
 197
 198 static int device_set_action(sd_device *device, const char *action) {
 199         DeviceAction a;
 200         int r;
 201
 202         assert(device);
 203         assert(action);
 204
 205         a = device_action_from_string(action);
 206         if (a < 0)
 207                 return -EINVAL;
 208
 209         r = device_add_property_internal(device, "ACTION", action);
 210         if (r < 0)
 211                 return r;
 212
 213         device->action = a;
 214
 215         return 0;
 216 }
 217
 218 int device_get_seqnum(sd_device *device, uint64_t *seqnum) {
 219         assert(device);
 220
 221         if (device->seqnum == 0)
 222                 return -ENOENT;
 223
 224         if (seqnum)
 225                 *seqnum = device->seqnum;
 226
 227         return 0;
 228 }
 229
 230 static int device_set_seqnum(sd_device *device, const char *str) {
 231         uint64_t seqnum;
 232         int r;
 233
 234         assert(device);
 235         assert(str);
 236
 237         r = safe_atou64(str, &seqnum);
 238         if (r < 0)
 239                 return r;
 240         if (seqnum == 0)
 241                 return -EINVAL;
 242
 243         r = device_add_property_internal(device, "SEQNUM", str);
 244         if (r < 0)
 245                 return r;
 246
 247         device->seqnum = seqnum;
 248
 249         return 0;
 250 }
 251
 252 static int device_amend(sd_device *device, const char *key, const char *value) {
 253         int r;
 254
 255         assert(device);
 256         assert(key);
 257         assert(value);
 258
 259         if (streq(key, "DEVPATH")) {
 260                 char *path;
 261
 262                 path = strjoina("/sys", value);
 263
 264                 /* the caller must verify or trust this data (e.g., if it comes from the kernel) */
 265                 r = device_set_syspath(device, path, false);
 266                 if (r < 0)
 267                         return log_device_debug_errno(device, r, "sd-device: Failed to set syspath to '%s': %m", path);
 268         } else if (streq(key, "SUBSYSTEM")) {
 269                 r = device_set_subsystem(device, value);
 270                 if (r < 0)
 271                         return log_device_debug_errno(device, r, "sd-device: Failed to set subsystem to '%s': %m", value);
 272         } else if (streq(key, "DEVTYPE")) {
 273                 r = device_set_devtype(device, value);
 274                 if (r < 0)
 275                         return log_device_debug_errno(device, r, "sd-device: Failed to set devtype to '%s': %m", value);
 276         } else if (streq(key, "DEVNAME")) {
 277                 r = device_set_devname(device, value);
 278                 if (r < 0)
 279                         return log_device_debug_errno(device, r, "sd-device: Failed to set devname to '%s': %m", value);
 280         } else if (streq(key, "USEC_INITIALIZED")) {
 281                 usec_t t;
 282
 283                 r = safe_atou64(value, &t);
 284                 if (r < 0)
 285                         return log_device_debug_errno(device, r, "sd-device: Failed to parse timestamp '%s': %m", value);
 286
 287                 r = device_set_usec_initialized(device, t);
 288                 if (r < 0)
 289                         return log_device_debug_errno(device, r, "sd-device: Failed to set usec-initialized to '%s': %m", value);
 290         } else if (streq(key, "DRIVER")) {
 291                 r = device_set_driver(device, value);
 292                 if (r < 0)
 293                         return log_device_debug_errno(device, r, "sd-device: Failed to set driver to '%s': %m", value);
 294         } else if (streq(key, "IFINDEX")) {
 295                 r = device_set_ifindex(device, value);
 296                 if (r < 0)
 297                         return log_device_debug_errno(device, r, "sd-device: Failed to set ifindex to '%s': %m", value);
 298         } else if (streq(key, "DEVMODE")) {
 299                 r = device_set_devmode(device, value);
 300                 if (r < 0)
 301                         return log_device_debug_errno(device, r, "sd-device: Failed to set devmode to '%s': %m", value);
 302         } else if (streq(key, "DEVUID")) {
 303                 r = device_set_devuid(device, value);
 304                 if (r < 0)
 305                         return log_device_debug_errno(device, r, "sd-device: Failed to set devuid to '%s': %m", value);
 306         } else if (streq(key, "DEVGID")) {
 307                 r = device_set_devgid(device, value);
 308                 if (r < 0)
 309                         return log_device_debug_errno(device, r, "sd-device: Failed to set devgid to '%s': %m", value);
 310         } else if (streq(key, "ACTION")) {
 311                 r = device_set_action(device, value);
 312                 if (r < 0)
 313                         return log_device_debug_errno(device, r, "sd-device: Failed to set action to '%s': %m", value);
 314         } else if (streq(key, "SEQNUM")) {
 315                 r = device_set_seqnum(device, value);
 316                 if (r < 0)
 317                         return log_device_debug_errno(device, r, "sd-device: Failed to set SEQNUM to '%s': %m", value);
 318         } else if (streq(key, "DEVLINKS")) {
 319                 const char *word, *state;
 320                 size_t l;
 321
 322                 FOREACH_WORD(word, l, value, state) {
 323                         char devlink[l + 1];
 324
 325                         strncpy(devlink, word, l);
 326                         devlink[l] = '\0';
 327
 328                         r = device_add_devlink(device, devlink);
 329                         if (r < 0)
 330                                 return log_device_debug_errno(device, r, "sd-device: Failed to add devlink '%s': %m", devlink);
 331                 }
 332         } else if (streq(key, "TAGS")) {
 333                 const char *word, *state;
 334                 size_t l;
 335
 336                 FOREACH_WORD_SEPARATOR(word, l, value, ":", state) {
 337                         char tag[l + 1];
 338
 339                         (void) strncpy(tag, word, l);
 340                         tag[l] = '\0';
 341
 342                         r = device_add_tag(device, tag);
 343                         if (r < 0)
 344                                 return log_device_debug_errno(device, r, "sd-device: Failed to add tag '%s': %m", tag);
 345                 }
 346         } else {
 347                 r = device_add_property_internal(device, key, value);
 348                 if (r < 0)
 349                         return log_device_debug_errno(device, r, "sd-device: Failed to add property '%s=%s': %m", key, value);
 350         }
 351
 352         return 0;
 353 }
 354
 355 static int device_append(sd_device *device, char *key, const char **_major, const char **_minor) {
 356         const char *major = NULL, *minor = NULL;
 357         char *value;
 358         int r;
 359
 360         assert(device);
 361         assert(key);
 362         assert(_major);
 363         assert(_minor);
 364
 365         value = strchr(key, '=');
 366         if (!value) {
 367                 log_device_debug(device, "sd-device: Not a key-value pair: '%s'", key);
 368                 return -EINVAL;
 369         }
 370
 371         *value = '\0';
 372
 373         value++;
 374
 375         if (streq(key, "MAJOR"))
 376                 major = value;
 377         else if (streq(key, "MINOR"))
 378                 minor = value;
 379         else {
 380                 r = device_amend(device, key, value);
 381                 if (r < 0)
 382                         return r;
 383         }
 384
 385         if (major != 0)
 386                 *_major = major;
 387
 388         if (minor != 0)
 389                 *_minor = minor;
 390
 391         return 0;
 392 }
 393
 394 void device_seal(sd_device *device) {
 395         assert(device);
 396
 397         device->sealed = true;
 398 }
 399
 400 static int device_verify(sd_device *device) {
 401         assert(device);
 402
 403         if (!device->devpath || !device->subsystem || device->action < 0 || device->seqnum == 0) {
 404                 log_device_debug(device, "sd-device: Device created from strv or nulstr lacks devpath, subsystem, action or seqnum.");
 405                 return -EINVAL;
 406         }
 407
 408         device->sealed = true;
 409
 410         return 0;
 411 }
 412
 413 int device_new_from_strv(sd_device **ret, char **strv) {
 414         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 415         char **key;
 416         const char *major = NULL, *minor = NULL;
 417         int r;
 418
 419         assert(ret);
 420         assert(strv);
 421
 422         r = device_new_aux(&device);
 423         if (r < 0)
 424                 return r;
 425
 426         STRV_FOREACH(key, strv) {
 427                 r = device_append(device, *key, &major, &minor);
 428                 if (r < 0)
 429                         return r;
 430         }
 431
 432         if (major) {
 433                 r = device_set_devnum(device, major, minor);
 434                 if (r < 0)
 435                         return log_device_debug_errno(device, r, "sd-device: Failed to set devnum %s:%s: %m", major, minor);
 436         }
 437
 438         r = device_verify(device);
 439         if (r < 0)
 440                 return r;
 441
 442         *ret = TAKE_PTR(device);
 443
 444         return 0;
 445 }
 446
 447 int device_new_from_nulstr(sd_device **ret, uint8_t *nulstr, size_t len) {
 448         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 449         const char *major = NULL, *minor = NULL;
 450         unsigned i = 0;
 451         int r;
 452
 453         assert(ret);
 454         assert(nulstr);
 455         assert(len);
 456
 457         r = device_new_aux(&device);
 458         if (r < 0)
 459                 return r;
 460
 461         while (i < len) {
 462                 char *key;
 463                 const char *end;
 464
 465                 key = (char*)&nulstr[i];
 466                 end = memchr(key, '\0', len - i);
 467                 if (!end) {
 468                         log_device_debug(device, "sd-device: Failed to parse nulstr");
 469                         return -EINVAL;
 470                 }
 471                 i += end - key + 1;
 472
 473                 r = device_append(device, key, &major, &minor);
 474                 if (r < 0)
 475                         return r;
 476         }
 477
 478         if (major) {
 479                 r = device_set_devnum(device, major, minor);
 480                 if (r < 0)
 481                         return log_device_debug_errno(device, r, "sd-device: Failed to set devnum %s:%s: %m", major, minor);
 482         }
 483
 484         r = device_verify(device);
 485         if (r < 0)
 486                 return r;
 487
 488         *ret = TAKE_PTR(device);
 489
 490         return 0;
 491 }
 492
 493 static int device_update_properties_bufs(sd_device *device) {
 494         const char *val, *prop;
 495         _cleanup_free_ char **buf_strv = NULL;
 496         _cleanup_free_ uint8_t *buf_nulstr = NULL;
 497         size_t allocated_nulstr = 0;
 498         size_t nulstr_len = 0, num = 0, i = 0;
 499
 500         assert(device);
 501
 502         if (!device->properties_buf_outdated)
 503                 return 0;
 504
 505         FOREACH_DEVICE_PROPERTY(device, prop, val) {
 506                 size_t len = 0;
 507
 508                 len = strlen(prop) + 1 + strlen(val);
 509
 510                 buf_nulstr = GREEDY_REALLOC0(buf_nulstr, allocated_nulstr, nulstr_len + len + 2);
 511                 if (!buf_nulstr)
 512                         return -ENOMEM;
 513
 514                 strscpyl((char *)buf_nulstr + nulstr_len, len + 1, prop, "=", val, NULL);
 515                 nulstr_len += len + 1;
 516                 ++num;
 517         }
 518
 519         /* build buf_strv from buf_nulstr */
 520         buf_strv = new0(char *, num + 1);
 521         if (!buf_strv)
 522                 return -ENOMEM;
 523
 524         NULSTR_FOREACH(val, (char*) buf_nulstr) {
 525                 buf_strv[i] = (char *) val;
 526                 assert(i < num);
 527                 i++;
 528         }
 529
 530         free_and_replace(device->properties_nulstr, buf_nulstr);
 531         device->properties_nulstr_len = nulstr_len;
 532         free_and_replace(device->properties_strv, buf_strv);
 533
 534         device->properties_buf_outdated = false;
 535
 536         return 0;
 537 }
 538
 539 int device_get_properties_nulstr(sd_device *device, const uint8_t **nulstr, size_t *len) {
 540         int r;
 541
 542         assert(device);
 543         assert(nulstr);
 544         assert(len);
 545
 546         r = device_update_properties_bufs(device);
 547         if (r < 0)
 548                 return r;
 549
 550         *nulstr = device->properties_nulstr;
 551         *len = device->properties_nulstr_len;
 552
 553         return 0;
 554 }
 555
 556 int device_get_properties_strv(sd_device *device, char ***strv) {
 557         int r;
 558
 559         assert(device);
 560         assert(strv);
 561
 562         r = device_update_properties_bufs(device);
 563         if (r < 0)
 564                 return r;
 565
 566         *strv = device->properties_strv;
 567
 568         return 0;
 569 }
 570
 571 int device_get_devlink_priority(sd_device *device, int *priority) {
 572         int r;
 573
 574         assert(device);
 575         assert(priority);
 576
 577         r = device_read_db(device);
 578         if (r < 0)
 579                 return r;
 580
 581         *priority = device->devlink_priority;
 582
 583         return 0;
 584 }
 585
 586 int device_get_watch_handle(sd_device *device, int *handle) {
 587         int r;
 588
 589         assert(device);
 590
 591         r = device_read_db(device);
 592         if (r < 0)
 593                 return r;
 594
 595         if (device->watch_handle < 0)
 596                 return -ENOENT;
 597
 598         if (handle)
 599                 *handle = device->watch_handle;
 600
 601         return 0;
 602 }
 603
 604 void device_set_watch_handle(sd_device *device, int handle) {
 605         assert(device);
 606
 607         device->watch_handle = handle;
 608 }
 609
 610 int device_rename(sd_device *device, const char *name) {
 611         _cleanup_free_ char *dirname = NULL;
 612         char *new_syspath;
 613         const char *interface;
 614         int r;
 615
 616         assert(device);
 617         assert(name);
 618
 619         dirname = dirname_malloc(device->syspath);
 620         if (!dirname)
 621                 return -ENOMEM;
 622
 623         new_syspath = strjoina(dirname, "/", name);
 624
 625         /* the user must trust that the new name is correct */
 626         r = device_set_syspath(device, new_syspath, false);
 627         if (r < 0)
 628                 return r;
 629
 630         r = sd_device_get_property_value(device, "INTERFACE", &interface);
 631         if (r >= 0) {
 632                 /* like DEVPATH_OLD, INTERFACE_OLD is not saved to the db, but only stays around for the current event */
 633                 r = device_add_property_internal(device, "INTERFACE_OLD", interface);
 634                 if (r < 0)
 635                         return r;
 636
 637                 r = device_add_property_internal(device, "INTERFACE", name);
 638                 if (r < 0)
 639                         return r;
 640         } else if (r != -ENOENT)
 641                 return r;
 642
 643         return 0;
 644 }
 645
 646 int device_shallow_clone(sd_device *old_device, sd_device **new_device) {
 647         _cleanup_(sd_device_unrefp) sd_device *ret = NULL;
 648         int r;
 649
 650         assert(old_device);
 651         assert(new_device);
 652
 653         r = device_new_aux(&ret);
 654         if (r < 0)
 655                 return r;
 656
 657         r = device_set_syspath(ret, old_device->syspath, false);
 658         if (r < 0)
 659                 return r;
 660
 661         r = device_set_subsystem(ret, old_device->subsystem);
 662         if (r < 0)
 663                 return r;
 664
 665         ret->devnum = old_device->devnum;
 666
 667         *new_device = TAKE_PTR(ret);
 668
 669         return 0;
 670 }
 671
 672 int device_clone_with_db(sd_device *old_device, sd_device **new_device) {
 673         _cleanup_(sd_device_unrefp) sd_device *ret = NULL;
 674         int r;
 675
 676         assert(old_device);
 677         assert(new_device);
 678
 679         r = device_shallow_clone(old_device, &ret);
 680         if (r < 0)
 681                 return r;
 682
 683         r = device_read_db(ret);
 684         if (r < 0)
 685                 return r;
 686
 687         ret->sealed = true;
 688
 689         *new_device = TAKE_PTR(ret);
 690
 691         return 0;
 692 }
 693
 694 int device_new_from_synthetic_event(sd_device **new_device, const char *syspath, const char *action) {
 695         _cleanup_(sd_device_unrefp) sd_device *ret = NULL;
 696         int r;
 697
 698         assert(new_device);
 699         assert(syspath);
 700         assert(action);
 701
 702         r = sd_device_new_from_syspath(&ret, syspath);
 703         if (r < 0)
 704                 return r;
 705
 706         r = device_read_uevent_file(ret);
 707         if (r < 0)
 708                 return r;
 709
 710         r = device_set_action(ret, action);
 711         if (r < 0)
 712                 return r;
 713
 714         *new_device = TAKE_PTR(ret);
 715
 716         return 0;
 717 }
 718
 719 int device_new_from_stat_rdev(sd_device **ret, const struct stat *st) {
 720         char type;
 721
 722         assert(ret);
 723         assert(st);
 724
 725         if (S_ISBLK(st->st_mode))
 726                 type = 'b';
 727         else if (S_ISCHR(st->st_mode))
 728                 type = 'c';
 729         else
 730                 return -ENOTTY;
 731
 732         return sd_device_new_from_devnum(ret, type, st->st_rdev);
 733 }
 734
 735 int device_copy_properties(sd_device *device_dst, sd_device *device_src) {
 736         const char *property, *value;
 737         Iterator i;
 738         int r;
 739
 740         assert(device_dst);
 741         assert(device_src);
 742
 743         r = device_properties_prepare(device_src);
 744         if (r < 0)
 745                 return r;
 746
 747         ORDERED_HASHMAP_FOREACH_KEY(value, property, device_src->properties_db, i) {
 748                 r = device_add_property_aux(device_dst, property, value, true);
 749                 if (r < 0)
 750                         return r;
 751         }
 752
 753         ORDERED_HASHMAP_FOREACH_KEY(value, property, device_src->properties, i) {
 754                 r = device_add_property_aux(device_dst, property, value, false);
 755                 if (r < 0)
 756                         return r;
 757         }
 758
 759         return 0;
 760 }
 761
 762 void device_cleanup_tags(sd_device *device) {
 763         assert(device);
 764
 765         set_free_free(device->tags);
 766         device->tags = NULL;
 767         device->property_tags_outdated = true;
 768         device->tags_generation++;
 769 }
 770
 771 void device_cleanup_devlinks(sd_device *device) {
 772         assert(device);
 773
 774         set_free_free(device->devlinks);
 775         device->devlinks = NULL;
 776         device->property_devlinks_outdated = true;
 777         device->devlinks_generation++;
 778 }
 779
 780 void device_remove_tag(sd_device *device, const char *tag) {
 781         assert(device);
 782         assert(tag);
 783
 784         free(set_remove(device->tags, tag));
 785         device->property_tags_outdated = true;
 786         device->tags_generation++;
 787 }
 788
 789 static int device_tag(sd_device *device, const char *tag, bool add) {
 790         const char *id;
 791         char *path;
 792         int r;
 793
 794         assert(device);
 795         assert(tag);
 796
 797         r = device_get_id_filename(device, &id);
 798         if (r < 0)
 799                 return r;
 800
 801         path = strjoina("/run/udev/tags/", tag, "/", id);
 802
 803         if (add) {
 804                 r = touch_file(path, true, USEC_INFINITY, UID_INVALID, GID_INVALID, 0444);
 805                 if (r < 0)
 806                         return r;
 807         } else {
 808                 r = unlink(path);
 809                 if (r < 0 && errno != ENOENT)
 810                         return -errno;
 811         }
 812
 813         return 0;
 814 }
 815
 816 int device_tag_index(sd_device *device, sd_device *device_old, bool add) {
 817         const char *tag;
 818         int r = 0, k;
 819
 820         if (add && device_old) {
 821                 /* delete possible left-over tags */
 822                 FOREACH_DEVICE_TAG(device_old, tag) {
 823                         if (!sd_device_has_tag(device, tag)) {
 824                                 k = device_tag(device_old, tag, false);
 825                                 if (r >= 0 && k < 0)
 826                                         r = k;
 827                         }
 828                 }
 829         }
 830
 831         FOREACH_DEVICE_TAG(device, tag) {
 832                 k = device_tag(device, tag, add);
 833                 if (r >= 0 && k < 0)
 834                         r = k;
 835         }
 836
 837         return r;
 838 }
 839
 840 static bool device_has_info(sd_device *device) {
 841         assert(device);
 842
 843         if (!set_isempty(device->devlinks))
 844                 return true;
 845
 846         if (device->devlink_priority != 0)
 847                 return true;
 848
 849         if (!ordered_hashmap_isempty(device->properties_db))
 850                 return true;
 851
 852         if (!set_isempty(device->tags))
 853                 return true;
 854
 855         if (device->watch_handle >= 0)
 856                 return true;
 857
 858         return false;
 859 }
 860
 861 void device_set_db_persist(sd_device *device) {
 862         assert(device);
 863
 864         device->db_persist = true;
 865 }
 866
 867 int device_update_db(sd_device *device) {
 868         const char *id;
 869         char *path;
 870         _cleanup_fclose_ FILE *f = NULL;
 871         _cleanup_free_ char *path_tmp = NULL;
 872         bool has_info;
 873         int r;
 874
 875         assert(device);
 876
 877         has_info = device_has_info(device);
 878
 879         r = device_get_id_filename(device, &id);
 880         if (r < 0)
 881                 return r;
 882
 883         path = strjoina("/run/udev/data/", id);
 884
 885         /* do not store anything for otherwise empty devices */
 886         if (!has_info && major(device->devnum) == 0 && device->ifindex == 0) {
 887                 r = unlink(path);
 888                 if (r < 0 && errno != ENOENT)
 889                         return -errno;
 890
 891                 return 0;
 892         }
 893
 894         /* write a database file */
 895         r = mkdir_parents(path, 0755);
 896         if (r < 0)
 897                 return r;
 898
 899         r = fopen_temporary(path, &f, &path_tmp);
 900         if (r < 0)
 901                 return r;
 902
 903         /*
 904          * set 'sticky' bit to indicate that we should not clean the
 905          * database when we transition from initramfs to the real root
 906          */
 907         if (device->db_persist) {
 908                 r = fchmod(fileno(f), 01644);
 909                 if (r < 0) {
 910                         r = -errno;
 911                         goto fail;
 912                 }
 913         } else {
 914                 r = fchmod(fileno(f), 0644);
 915                 if (r < 0) {
 916                         r = -errno;
 917                         goto fail;
 918                 }
 919         }
 920
 921         if (has_info) {
 922                 const char *property, *value, *tag;
 923                 Iterator i;
 924
 925                 if (major(device->devnum) > 0) {
 926                         const char *devlink;
 927
 928                         FOREACH_DEVICE_DEVLINK(device, devlink)
 929                                 fprintf(f, "S:%s\n", devlink + STRLEN("/dev/"));
 930
 931                         if (device->devlink_priority != 0)
 932                                 fprintf(f, "L:%i\n", device->devlink_priority);
 933
 934                         if (device->watch_handle >= 0)
 935                                 fprintf(f, "W:%i\n", device->watch_handle);
 936                 }
 937
 938                 if (device->usec_initialized > 0)
 939                         fprintf(f, "I:"USEC_FMT"\n", device->usec_initialized);
 940
 941                 ORDERED_HASHMAP_FOREACH_KEY(value, property, device->properties_db, i)
 942                         fprintf(f, "E:%s=%s\n", property, value);
 943
 944                 FOREACH_DEVICE_TAG(device, tag)
 945                         fprintf(f, "G:%s\n", tag);
 946         }
 947
 948         r = fflush_and_check(f);
 949         if (r < 0)
 950                 goto fail;
 951
 952         r = rename(path_tmp, path);
 953         if (r < 0) {
 954                 r = -errno;
 955                 goto fail;
 956         }
 957
 958         log_device_debug(device, "sd-device: Created %s file '%s' for '%s'", has_info ? "db" : "empty",
 959                          path, device->devpath);
 960
 961         return 0;
 962
 963 fail:
 964         (void) unlink(path);
 965         (void) unlink(path_tmp);
 966
 967         return log_device_debug_errno(device, r, "sd-device: Failed to create %s file '%s' for '%s'", has_info ? "db" : "empty", path, device->devpath);
 968 }
 969
 970 int device_delete_db(sd_device *device) {
 971         const char *id;
 972         char *path;
 973         int r;
 974
 975         assert(device);
 976
 977         r = device_get_id_filename(device, &id);
 978         if (r < 0)
 979                 return r;
 980
 981         path = strjoina("/run/udev/data/", id);
 982
 983         r = unlink(path);
 984         if (r < 0 && errno != ENOENT)
 985                 return -errno;
 986
 987         return 0;
 988 }
 989
 990 static const char* const device_action_table[_DEVICE_ACTION_MAX] = {
 991         [DEVICE_ACTION_ADD]     = "add",
 992         [DEVICE_ACTION_REMOVE]  = "remove",
 993         [DEVICE_ACTION_CHANGE]  = "change",
 994         [DEVICE_ACTION_MOVE]    = "move",
 995         [DEVICE_ACTION_ONLINE]  = "online",
 996         [DEVICE_ACTION_OFFLINE] = "offline",
 997         [DEVICE_ACTION_BIND]    = "bind",
 998         [DEVICE_ACTION_UNBIND]  = "unbind",
 999 };
1000
1001 DEFINE_STRING_TABLE_LOOKUP(device_action, DeviceAction);