src/path.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <sys/inotify.h>
  23 #include <sys/epoll.h>
  24 #include <sys/ioctl.h>
  25 #include <errno.h>
  26 #include <unistd.h>
  27
  28 #include "unit.h"
  29 #include "unit-name.h"
  30 #include "path.h"
  31 #include "dbus-path.h"
  32 #include "special.h"
  33 #include "bus-errors.h"
  34
  35 static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = {
  36         [PATH_DEAD] = UNIT_INACTIVE,
  37         [PATH_WAITING] = UNIT_ACTIVE,
  38         [PATH_RUNNING] = UNIT_ACTIVE,
  39         [PATH_FAILED] = UNIT_FAILED
  40 };
  41
  42 int path_spec_watch(PathSpec *s, Unit *u) {
  43
  44         static const int flags_table[_PATH_TYPE_MAX] = {
  45                 [PATH_EXISTS] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB,
  46                 [PATH_EXISTS_GLOB] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB,
  47                 [PATH_CHANGED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO,
  48                 [PATH_MODIFIED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO|IN_MODIFY,
  49                 [PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO
  50         };
  51
  52         bool exists = false;
  53         char *k, *slash;
  54         int r;
  55
  56         assert(u);
  57         assert(s);
  58
  59         path_spec_unwatch(s, u);
  60
  61         if (!(k = strdup(s->path)))
  62                 return -ENOMEM;
  63
  64         if ((s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC)) < 0) {
  65                 r = -errno;
  66                 goto fail;
  67         }
  68
  69         if (unit_watch_fd(u, s->inotify_fd, EPOLLIN, &s->watch) < 0) {
  70                 r = -errno;
  71                 goto fail;
  72         }
  73
  74         if ((s->primary_wd = inotify_add_watch(s->inotify_fd, k, flags_table[s->type])) >= 0)
  75                 exists = true;
  76
  77         do {
  78                 int flags;
  79
  80                 /* This assumes the path was passed through path_kill_slashes()! */
  81                 if (!(slash = strrchr(k, '/')))
  82                         break;
  83
  84                 /* Trim the path at the last slash. Keep the slash if it's the root dir. */
  85                 slash[slash == k] = 0;
  86
  87                 flags = IN_MOVE_SELF;
  88                 if (!exists)
  89                         flags |= IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO;
  90
  91                 if (inotify_add_watch(s->inotify_fd, k, flags) >= 0)
  92                         exists = true;
  93         } while (slash != k);
  94
  95         return 0;
  96
  97 fail:
  98         free(k);
  99
 100         path_spec_unwatch(s, u);
 101         return r;
 102 }
 103
 104 void path_spec_unwatch(PathSpec *s, Unit *u) {
 105
 106         if (s->inotify_fd < 0)
 107                 return;
 108
 109         unit_unwatch_fd(u, &s->watch);
 110
 111         close_nointr_nofail(s->inotify_fd);
 112         s->inotify_fd = -1;
 113 }
 114
 115 int path_spec_fd_event(PathSpec *s, uint32_t events) {
 116         uint8_t *buf = NULL;
 117         struct inotify_event *e;
 118         ssize_t k;
 119         int l;
 120         int r = 0;
 121
 122         if (events != EPOLLIN) {
 123                 log_error("Got Invalid poll event on inotify.");
 124                 r = -EINVAL;
 125                 goto out;
 126         }
 127
 128         if (ioctl(s->inotify_fd, FIONREAD, &l) < 0) {
 129                 log_error("FIONREAD failed: %m");
 130                 r = -errno;
 131                 goto out;
 132         }
 133
 134         assert(l > 0);
 135
 136         if (!(buf = malloc(l))) {
 137                 log_error("Failed to allocate buffer: %m");
 138                 r = -errno;
 139                 goto out;
 140         }
 141
 142         if ((k = read(s->inotify_fd, buf, l)) < 0) {
 143                 log_error("Failed to read inotify event: %m");
 144                 r = -errno;
 145                 goto out;
 146         }
 147
 148         e = (struct inotify_event*) buf;
 149
 150         while (k > 0) {
 151                 size_t step;
 152
 153                 if ((s->type == PATH_CHANGED || s->type == PATH_MODIFIED) &&
 154                     s->primary_wd == e->wd)
 155                         r = 1;
 156
 157                 step = sizeof(struct inotify_event) + e->len;
 158                 assert(step <= (size_t) k);
 159
 160                 e = (struct inotify_event*) ((uint8_t*) e + step);
 161                 k -= step;
 162         }
 163 out:
 164         free(buf);
 165         return r;
 166 }
 167
 168 static bool path_spec_check_good(PathSpec *s, bool initial) {
 169         bool good = false;
 170
 171         switch (s->type) {
 172
 173         case PATH_EXISTS:
 174                 good = access(s->path, F_OK) >= 0;
 175                 break;
 176
 177         case PATH_EXISTS_GLOB:
 178                 good = glob_exists(s->path) > 0;
 179                 break;
 180
 181         case PATH_DIRECTORY_NOT_EMPTY: {
 182                 int k;
 183
 184                 k = dir_is_empty(s->path);
 185                 good = !(k == -ENOENT || k > 0);
 186                 break;
 187         }
 188
 189         case PATH_CHANGED:
 190         case PATH_MODIFIED: {
 191                 bool b;
 192
 193                 b = access(s->path, F_OK) >= 0;
 194                 good = !initial && b != s->previous_exists;
 195                 s->previous_exists = b;
 196                 break;
 197         }
 198
 199         default:
 200                 ;
 201         }
 202
 203         return good;
 204 }
 205
 206 static bool path_spec_startswith(PathSpec *s, const char *what) {
 207         return path_startswith(s->path, what);
 208 }
 209
 210 static void path_spec_mkdir(PathSpec *s, mode_t mode) {
 211         int r;
 212
 213         if (s->type == PATH_EXISTS || s->type == PATH_EXISTS_GLOB)
 214                 return;
 215
 216         if ((r = mkdir_p(s->path, mode)) < 0)
 217                 log_warning("mkdir(%s) failed: %s", s->path, strerror(-r));
 218 }
 219
 220 static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) {
 221         fprintf(f,
 222                 "%s%s: %s\n",
 223                 prefix,
 224                 path_type_to_string(s->type),
 225                 s->path);
 226 }
 227
 228 void path_spec_done(PathSpec *s) {
 229         assert(s);
 230         assert(s->inotify_fd == -1);
 231
 232         free(s->path);
 233 }
 234
 235 static void path_init(Unit *u) {
 236         Path *p = PATH(u);
 237
 238         assert(u);
 239         assert(u->load_state == UNIT_STUB);
 240
 241         p->directory_mode = 0755;
 242 }
 243
 244 static void path_done(Unit *u) {
 245         Path *p = PATH(u);
 246         PathSpec *s;
 247
 248         assert(p);
 249
 250         unit_ref_unset(&p->unit);
 251
 252         while ((s = p->specs)) {
 253                 path_spec_unwatch(s, u);
 254                 LIST_REMOVE(PathSpec, spec, p->specs, s);
 255                 path_spec_done(s);
 256                 free(s);
 257         }
 258 }
 259
 260 int path_add_one_mount_link(Path *p, Mount *m) {
 261         PathSpec *s;
 262         int r;
 263
 264         assert(p);
 265         assert(m);
 266
 267         if (UNIT(p)->load_state != UNIT_LOADED ||
 268             UNIT(m)->load_state != UNIT_LOADED)
 269                 return 0;
 270
 271         LIST_FOREACH(spec, s, p->specs) {
 272
 273                 if (!path_spec_startswith(s, m->where))
 274                         continue;
 275
 276                 if ((r = unit_add_two_dependencies(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
 277                         return r;
 278         }
 279
 280         return 0;
 281 }
 282
 283 static int path_add_mount_links(Path *p) {
 284         Unit *other;
 285         int r;
 286
 287         assert(p);
 288
 289         LIST_FOREACH(units_by_type, other, UNIT(p)->manager->units_by_type[UNIT_MOUNT])
 290                 if ((r = path_add_one_mount_link(p, MOUNT(other))) < 0)
 291                         return r;
 292
 293         return 0;
 294 }
 295
 296 static int path_verify(Path *p) {
 297         assert(p);
 298
 299         if (UNIT(p)->load_state != UNIT_LOADED)
 300                 return 0;
 301
 302         if (!p->specs) {
 303                 log_error("%s lacks path setting. Refusing.", UNIT(p)->id);
 304                 return -EINVAL;
 305         }
 306
 307         return 0;
 308 }
 309
 310 static int path_add_default_dependencies(Path *p) {
 311         int r;
 312
 313         assert(p);
 314
 315         if (UNIT(p)->manager->running_as == MANAGER_SYSTEM) {
 316                 if ((r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, SPECIAL_BASIC_TARGET, NULL, true)) < 0)
 317                         return r;
 318
 319                 if ((r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
 320                         return r;
 321         }
 322
 323         return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
 324 }
 325
 326 static int path_load(Unit *u) {
 327         Path *p = PATH(u);
 328         int r;
 329
 330         assert(u);
 331         assert(u->load_state == UNIT_STUB);
 332
 333         if ((r = unit_load_fragment_and_dropin(u)) < 0)
 334                 return r;
 335
 336         if (u->load_state == UNIT_LOADED) {
 337
 338                 if (!UNIT_DEREF(p->unit)) {
 339                         Unit *x;
 340
 341                         r = unit_load_related_unit(u, ".service", &x);
 342                         if (r < 0)
 343                                 return r;
 344
 345                         unit_ref_set(&p->unit, x);
 346                 }
 347
 348                 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(p->unit), true);
 349                 if (r < 0)
 350                         return r;
 351
 352                 if ((r = path_add_mount_links(p)) < 0)
 353                         return r;
 354
 355                 if (UNIT(p)->default_dependencies)
 356                         if ((r = path_add_default_dependencies(p)) < 0)
 357                                 return r;
 358         }
 359
 360         return path_verify(p);
 361 }
 362
 363 static void path_dump(Unit *u, FILE *f, const char *prefix) {
 364         Path *p = PATH(u);
 365         PathSpec *s;
 366
 367         assert(p);
 368         assert(f);
 369
 370         fprintf(f,
 371                 "%sPath State: %s\n"
 372                 "%sResult: %s\n"
 373                 "%sUnit: %s\n"
 374                 "%sMakeDirectory: %s\n"
 375                 "%sDirectoryMode: %04o\n",
 376                 prefix, path_state_to_string(p->state),
 377                 prefix, path_result_to_string(p->result),
 378                 prefix, UNIT_DEREF(p->unit)->id,
 379                 prefix, yes_no(p->make_directory),
 380                 prefix, p->directory_mode);
 381
 382         LIST_FOREACH(spec, s, p->specs)
 383                 path_spec_dump(s, f, prefix);
 384 }
 385
 386 static void path_unwatch(Path *p) {
 387         PathSpec *s;
 388
 389         assert(p);
 390
 391         LIST_FOREACH(spec, s, p->specs)
 392                 path_spec_unwatch(s, UNIT(p));
 393 }
 394
 395 static int path_watch(Path *p) {
 396         int r;
 397         PathSpec *s;
 398
 399         assert(p);
 400
 401         LIST_FOREACH(spec, s, p->specs)
 402                 if ((r = path_spec_watch(s, UNIT(p))) < 0)
 403                         return r;
 404
 405         return 0;
 406 }
 407
 408 static void path_set_state(Path *p, PathState state) {
 409         PathState old_state;
 410         assert(p);
 411
 412         old_state = p->state;
 413         p->state = state;
 414
 415         if (state != PATH_WAITING &&
 416             (state != PATH_RUNNING || p->inotify_triggered))
 417                 path_unwatch(p);
 418
 419         if (state != old_state)
 420                 log_debug("%s changed %s -> %s",
 421                           UNIT(p)->id,
 422                           path_state_to_string(old_state),
 423                           path_state_to_string(state));
 424
 425         unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true);
 426 }
 427
 428 static void path_enter_waiting(Path *p, bool initial, bool recheck);
 429
 430 static int path_coldplug(Unit *u) {
 431         Path *p = PATH(u);
 432
 433         assert(p);
 434         assert(p->state == PATH_DEAD);
 435
 436         if (p->deserialized_state != p->state) {
 437
 438                 if (p->deserialized_state == PATH_WAITING ||
 439                     p->deserialized_state == PATH_RUNNING)
 440                         path_enter_waiting(p, true, true);
 441                 else
 442                         path_set_state(p, p->deserialized_state);
 443         }
 444
 445         return 0;
 446 }
 447
 448 static void path_enter_dead(Path *p, PathResult f) {
 449         assert(p);
 450
 451         if (f != PATH_SUCCESS)
 452                 p->result = f;
 453
 454         path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD);
 455 }
 456
 457 static void path_enter_running(Path *p) {
 458         int r;
 459         DBusError error;
 460
 461         assert(p);
 462         dbus_error_init(&error);
 463
 464         /* Don't start job if we are supposed to go down */
 465         if (UNIT(p)->job && UNIT(p)->job->type == JOB_STOP)
 466                 return;
 467
 468         if ((r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_DEREF(p->unit), JOB_REPLACE, true, &error, NULL)) < 0)
 469                 goto fail;
 470
 471         p->inotify_triggered = false;
 472
 473         if ((r = path_watch(p)) < 0)
 474                 goto fail;
 475
 476         path_set_state(p, PATH_RUNNING);
 477         return;
 478
 479 fail:
 480         log_warning("%s failed to queue unit startup job: %s", UNIT(p)->id, bus_error(&error, r));
 481         path_enter_dead(p, PATH_FAILURE_RESOURCES);
 482
 483         dbus_error_free(&error);
 484 }
 485
 486 static bool path_check_good(Path *p, bool initial) {
 487         PathSpec *s;
 488         bool good = false;
 489
 490         assert(p);
 491
 492         LIST_FOREACH(spec, s, p->specs) {
 493                 good = path_spec_check_good(s, initial);
 494
 495                 if (good)
 496                         break;
 497         }
 498
 499         return good;
 500 }
 501
 502 static void path_enter_waiting(Path *p, bool initial, bool recheck) {
 503         int r;
 504
 505         if (recheck)
 506                 if (path_check_good(p, initial)) {
 507                         log_debug("%s got triggered.", UNIT(p)->id);
 508                         path_enter_running(p);
 509                         return;
 510                 }
 511
 512         if ((r = path_watch(p)) < 0)
 513                 goto fail;
 514
 515         /* Hmm, so now we have created inotify watches, but the file
 516          * might have appeared/been removed by now, so we must
 517          * recheck */
 518
 519         if (recheck)
 520                 if (path_check_good(p, false)) {
 521                         log_debug("%s got triggered.", UNIT(p)->id);
 522                         path_enter_running(p);
 523                         return;
 524                 }
 525
 526         path_set_state(p, PATH_WAITING);
 527         return;
 528
 529 fail:
 530         log_warning("%s failed to enter waiting state: %s", UNIT(p)->id, strerror(-r));
 531         path_enter_dead(p, PATH_FAILURE_RESOURCES);
 532 }
 533
 534 static void path_mkdir(Path *p) {
 535         PathSpec *s;
 536
 537         assert(p);
 538
 539         if (!p->make_directory)
 540                 return;
 541
 542         LIST_FOREACH(spec, s, p->specs)
 543                 path_spec_mkdir(s, p->directory_mode);
 544 }
 545
 546 static int path_start(Unit *u) {
 547         Path *p = PATH(u);
 548
 549         assert(p);
 550         assert(p->state == PATH_DEAD || p->state == PATH_FAILED);
 551
 552         if (UNIT_DEREF(p->unit)->load_state != UNIT_LOADED)
 553                 return -ENOENT;
 554
 555         path_mkdir(p);
 556
 557         p->result = PATH_SUCCESS;
 558         path_enter_waiting(p, true, true);
 559
 560         return 0;
 561 }
 562
 563 static int path_stop(Unit *u) {
 564         Path *p = PATH(u);
 565
 566         assert(p);
 567         assert(p->state == PATH_WAITING || p->state == PATH_RUNNING);
 568
 569         path_enter_dead(p, PATH_SUCCESS);
 570         return 0;
 571 }
 572
 573 static int path_serialize(Unit *u, FILE *f, FDSet *fds) {
 574         Path *p = PATH(u);
 575
 576         assert(u);
 577         assert(f);
 578         assert(fds);
 579
 580         unit_serialize_item(u, f, "state", path_state_to_string(p->state));
 581         unit_serialize_item(u, f, "result", path_result_to_string(p->result));
 582
 583         return 0;
 584 }
 585
 586 static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
 587         Path *p = PATH(u);
 588
 589         assert(u);
 590         assert(key);
 591         assert(value);
 592         assert(fds);
 593
 594         if (streq(key, "state")) {
 595                 PathState state;
 596
 597                 if ((state = path_state_from_string(value)) < 0)
 598                         log_debug("Failed to parse state value %s", value);
 599                 else
 600                         p->deserialized_state = state;
 601
 602         } else if (streq(key, "result")) {
 603                 PathResult f;
 604
 605                 f = path_result_from_string(value);
 606                 if (f < 0)
 607                         log_debug("Failed to parse result value %s", value);
 608                 else if (f != PATH_SUCCESS)
 609                         p->result = f;
 610
 611         } else
 612                 log_debug("Unknown serialization key '%s'", key);
 613
 614         return 0;
 615 }
 616
 617 static UnitActiveState path_active_state(Unit *u) {
 618         assert(u);
 619
 620         return state_translation_table[PATH(u)->state];
 621 }
 622
 623 static const char *path_sub_state_to_string(Unit *u) {
 624         assert(u);
 625
 626         return path_state_to_string(PATH(u)->state);
 627 }
 628
 629 static void path_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
 630         Path *p = PATH(u);
 631         PathSpec *s;
 632         int changed;
 633
 634         assert(p);
 635         assert(fd >= 0);
 636
 637         if (p->state != PATH_WAITING &&
 638             p->state != PATH_RUNNING)
 639                 return;
 640
 641         /* log_debug("inotify wakeup on %s.", u->id); */
 642
 643         LIST_FOREACH(spec, s, p->specs)
 644                 if (path_spec_owns_inotify_fd(s, fd))
 645                         break;
 646
 647         if (!s) {
 648                 log_error("Got event on unknown fd.");
 649                 goto fail;
 650         }
 651
 652         changed = path_spec_fd_event(s, events);
 653         if (changed < 0)
 654                 goto fail;
 655
 656         /* If we are already running, then remember that one event was
 657          * dispatched so that we restart the service only if something
 658          * actually changed on disk */
 659         p->inotify_triggered = true;
 660
 661         if (changed)
 662                 path_enter_running(p);
 663         else
 664                 path_enter_waiting(p, false, true);
 665
 666         return;
 667
 668 fail:
 669         path_enter_dead(p, PATH_FAILURE_RESOURCES);
 670 }
 671
 672 void path_unit_notify(Unit *u, UnitActiveState new_state) {
 673         Iterator i;
 674         Unit *k;
 675
 676         if (u->type == UNIT_PATH)
 677                 return;
 678
 679         SET_FOREACH(k, u->dependencies[UNIT_TRIGGERED_BY], i) {
 680                 Path *p;
 681
 682                 if (k->type != UNIT_PATH)
 683                         continue;
 684
 685                 if (k->load_state != UNIT_LOADED)
 686                         continue;
 687
 688                 p = PATH(k);
 689
 690                 if (p->state == PATH_RUNNING && new_state == UNIT_INACTIVE) {
 691                         log_debug("%s got notified about unit deactivation.", UNIT(p)->id);
 692
 693                         /* Hmm, so inotify was triggered since the
 694                          * last activation, so I guess we need to
 695                          * recheck what is going on. */
 696                         path_enter_waiting(p, false, p->inotify_triggered);
 697                 }
 698         }
 699 }
 700
 701 static void path_reset_failed(Unit *u) {
 702         Path *p = PATH(u);
 703
 704         assert(p);
 705
 706         if (p->state == PATH_FAILED)
 707                 path_set_state(p, PATH_DEAD);
 708
 709         p->result = PATH_SUCCESS;
 710 }
 711
 712 static const char* const path_state_table[_PATH_STATE_MAX] = {
 713         [PATH_DEAD] = "dead",
 714         [PATH_WAITING] = "waiting",
 715         [PATH_RUNNING] = "running",
 716         [PATH_FAILED] = "failed"
 717 };
 718
 719 DEFINE_STRING_TABLE_LOOKUP(path_state, PathState);
 720
 721 static const char* const path_type_table[_PATH_TYPE_MAX] = {
 722         [PATH_EXISTS] = "PathExists",
 723         [PATH_EXISTS_GLOB] = "PathExistsGlob",
 724         [PATH_CHANGED] = "PathChanged",
 725         [PATH_MODIFIED] = "PathModified",
 726         [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty"
 727 };
 728
 729 DEFINE_STRING_TABLE_LOOKUP(path_type, PathType);
 730
 731 static const char* const path_result_table[_PATH_RESULT_MAX] = {
 732         [PATH_SUCCESS] = "success",
 733         [PATH_FAILURE_RESOURCES] = "resources"
 734 };
 735
 736 DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult);
 737
 738 const UnitVTable path_vtable = {
 739         .suffix = ".path",
 740         .object_size = sizeof(Path),
 741         .sections =
 742                 "Unit\0"
 743                 "Path\0"
 744                 "Install\0",
 745
 746         .init = path_init,
 747         .done = path_done,
 748         .load = path_load,
 749
 750         .coldplug = path_coldplug,
 751
 752         .dump = path_dump,
 753
 754         .start = path_start,
 755         .stop = path_stop,
 756
 757         .serialize = path_serialize,
 758         .deserialize_item = path_deserialize_item,
 759
 760         .active_state = path_active_state,
 761         .sub_state_to_string = path_sub_state_to_string,
 762
 763         .fd_event = path_fd_event,
 764
 765         .reset_failed = path_reset_failed,
 766
 767         .bus_interface = "org.freedesktop.systemd1.Path",
 768         .bus_message_handler = bus_path_message_handler,
 769         .bus_invalidating_properties = bus_path_invalidating_properties
 770 };