src/core/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 Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 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   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser 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 "mkdir.h"
  32 #include "dbus-path.h"
  33 #include "special.h"
  34 #include "bus-errors.h"
  35 #include "path-util.h"
  36
  37 static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = {
  38         [PATH_DEAD] = UNIT_INACTIVE,
  39         [PATH_WAITING] = UNIT_ACTIVE,
  40         [PATH_RUNNING] = UNIT_ACTIVE,
  41         [PATH_FAILED] = UNIT_FAILED
  42 };
  43
  44 int path_spec_watch(PathSpec *s, Unit *u) {
  45
  46         static const int flags_table[_PATH_TYPE_MAX] = {
  47                 [PATH_EXISTS] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB,
  48                 [PATH_EXISTS_GLOB] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB,
  49                 [PATH_CHANGED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO,
  50                 [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,
  51                 [PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO
  52         };
  53
  54         bool exists = false;
  55         char *k, *slash;
  56         int r;
  57
  58         assert(u);
  59         assert(s);
  60
  61         path_spec_unwatch(s, u);
  62
  63         if (!(k = strdup(s->path)))
  64                 return -ENOMEM;
  65
  66         if ((s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC)) < 0) {
  67                 r = -errno;
  68                 goto fail;
  69         }
  70
  71         if (unit_watch_fd(u, s->inotify_fd, EPOLLIN, &s->watch) < 0) {
  72                 r = -errno;
  73                 goto fail;
  74         }
  75
  76         s->primary_wd = inotify_add_watch(s->inotify_fd, k, flags_table[s->type]);
  77         if (s->primary_wd >= 0)
  78                 exists = true;
  79
  80         do {
  81                 int flags;
  82
  83                 /* This assumes the path was passed through path_kill_slashes()! */
  84                 slash = strrchr(k, '/');
  85                 if (!slash)
  86                         break;
  87
  88                 /* Trim the path at the last slash. Keep the slash if it's the root dir. */
  89                 slash[slash == k] = 0;
  90
  91                 flags = IN_MOVE_SELF;
  92                 if (!exists)
  93                         flags |= IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO;
  94
  95                 if (inotify_add_watch(s->inotify_fd, k, flags) >= 0)
  96                         exists = true;
  97         } while (slash != k);
  98
  99         return 0;
 100
 101 fail:
 102         free(k);
 103
 104         path_spec_unwatch(s, u);
 105         return r;
 106 }
 107
 108 void path_spec_unwatch(PathSpec *s, Unit *u) {
 109
 110         if (s->inotify_fd < 0)
 111                 return;
 112
 113         unit_unwatch_fd(u, &s->watch);
 114
 115         close_nointr_nofail(s->inotify_fd);
 116         s->inotify_fd = -1;
 117 }
 118
 119 int path_spec_fd_event(PathSpec *s, uint32_t events) {
 120         uint8_t *buf = NULL;
 121         struct inotify_event *e;
 122         ssize_t k;
 123         int l;
 124         int r = 0;
 125
 126         if (events != EPOLLIN) {
 127                 log_error("Got Invalid poll event on inotify.");
 128                 r = -EINVAL;
 129                 goto out;
 130         }
 131
 132         if (ioctl(s->inotify_fd, FIONREAD, &l) < 0) {
 133                 log_error("FIONREAD failed: %m");
 134                 r = -errno;
 135                 goto out;
 136         }
 137
 138         assert(l > 0);
 139
 140         if (!(buf = malloc(l))) {
 141                 log_error("Failed to allocate buffer: %m");
 142                 r = -errno;
 143                 goto out;
 144         }
 145
 146         if ((k = read(s->inotify_fd, buf, l)) < 0) {
 147                 log_error("Failed to read inotify event: %m");
 148                 r = -errno;
 149                 goto out;
 150         }
 151
 152         e = (struct inotify_event*) buf;
 153
 154         while (k > 0) {
 155                 size_t step;
 156
 157                 if ((s->type == PATH_CHANGED || s->type == PATH_MODIFIED) &&
 158                     s->primary_wd == e->wd)
 159                         r = 1;
 160
 161                 step = sizeof(struct inotify_event) + e->len;
 162                 assert(step <= (size_t) k);
 163
 164                 e = (struct inotify_event*) ((uint8_t*) e + step);
 165                 k -= step;
 166         }
 167 out:
 168         free(buf);
 169         return r;
 170 }
 171
 172 static bool path_spec_check_good(PathSpec *s, bool initial) {
 173         bool good = false;
 174
 175         switch (s->type) {
 176
 177         case PATH_EXISTS:
 178                 good = access(s->path, F_OK) >= 0;
 179                 break;
 180
 181         case PATH_EXISTS_GLOB:
 182                 good = glob_exists(s->path) > 0;
 183                 break;
 184
 185         case PATH_DIRECTORY_NOT_EMPTY: {
 186                 int k;
 187
 188                 k = dir_is_empty(s->path);
 189                 good = !(k == -ENOENT || k > 0);
 190                 break;
 191         }
 192
 193         case PATH_CHANGED:
 194         case PATH_MODIFIED: {
 195                 bool b;
 196
 197                 b = access(s->path, F_OK) >= 0;
 198                 good = !initial && b != s->previous_exists;
 199                 s->previous_exists = b;
 200                 break;
 201         }
 202
 203         default:
 204                 ;
 205         }
 206
 207         return good;
 208 }
 209
 210 static bool path_spec_startswith(PathSpec *s, const char *what) {
 211         return path_startswith(s->path, what);
 212 }
 213
 214 static void path_spec_mkdir(PathSpec *s, mode_t mode) {
 215         int r;
 216
 217         if (s->type == PATH_EXISTS || s->type == PATH_EXISTS_GLOB)
 218                 return;
 219
 220         if ((r = mkdir_p_label(s->path, mode)) < 0)
 221                 log_warning("mkdir(%s) failed: %s", s->path, strerror(-r));
 222 }
 223
 224 static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) {
 225         fprintf(f,
 226                 "%s%s: %s\n",
 227                 prefix,
 228                 path_type_to_string(s->type),
 229                 s->path);
 230 }
 231
 232 void path_spec_done(PathSpec *s) {
 233         assert(s);
 234         assert(s->inotify_fd == -1);
 235
 236         free(s->path);
 237 }
 238
 239 static void path_init(Unit *u) {
 240         Path *p = PATH(u);
 241
 242         assert(u);
 243         assert(u->load_state == UNIT_STUB);
 244
 245         p->directory_mode = 0755;
 246 }
 247
 248 static void path_done(Unit *u) {
 249         Path *p = PATH(u);
 250         PathSpec *s;
 251
 252         assert(p);
 253
 254         unit_ref_unset(&p->unit);
 255
 256         while ((s = p->specs)) {
 257                 path_spec_unwatch(s, u);
 258                 LIST_REMOVE(PathSpec, spec, p->specs, s);
 259                 path_spec_done(s);
 260                 free(s);
 261         }
 262 }
 263
 264 int path_add_one_mount_link(Path *p, Mount *m) {
 265         PathSpec *s;
 266         int r;
 267
 268         assert(p);
 269         assert(m);
 270
 271         if (UNIT(p)->load_state != UNIT_LOADED ||
 272             UNIT(m)->load_state != UNIT_LOADED)
 273                 return 0;
 274
 275         LIST_FOREACH(spec, s, p->specs) {
 276
 277                 if (!path_spec_startswith(s, m->where))
 278                         continue;
 279
 280                 if ((r = unit_add_two_dependencies(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
 281                         return r;
 282         }
 283
 284         return 0;
 285 }
 286
 287 static int path_add_mount_links(Path *p) {
 288         Unit *other;
 289         int r;
 290
 291         assert(p);
 292
 293         LIST_FOREACH(units_by_type, other, UNIT(p)->manager->units_by_type[UNIT_MOUNT])
 294                 if ((r = path_add_one_mount_link(p, MOUNT(other))) < 0)
 295                         return r;
 296
 297         return 0;
 298 }
 299
 300 static int path_verify(Path *p) {
 301         assert(p);
 302
 303         if (UNIT(p)->load_state != UNIT_LOADED)
 304                 return 0;
 305
 306         if (!p->specs) {
 307                 log_error("%s lacks path setting. Refusing.", UNIT(p)->id);
 308                 return -EINVAL;
 309         }
 310
 311         return 0;
 312 }
 313
 314 static int path_add_default_dependencies(Path *p) {
 315         int r;
 316
 317         assert(p);
 318
 319         if (UNIT(p)->manager->running_as == SYSTEMD_SYSTEM) {
 320                 if ((r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE, SPECIAL_BASIC_TARGET, NULL, true)) < 0)
 321                         return r;
 322
 323                 if ((r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true)) < 0)
 324                         return r;
 325         }
 326
 327         return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
 328 }
 329
 330 static int path_load(Unit *u) {
 331         Path *p = PATH(u);
 332         int r;
 333
 334         assert(u);
 335         assert(u->load_state == UNIT_STUB);
 336
 337         if ((r = unit_load_fragment_and_dropin(u)) < 0)
 338                 return r;
 339
 340         if (u->load_state == UNIT_LOADED) {
 341
 342                 if (!UNIT_DEREF(p->unit)) {
 343                         Unit *x;
 344
 345                         r = unit_load_related_unit(u, ".service", &x);
 346                         if (r < 0)
 347                                 return r;
 348
 349                         unit_ref_set(&p->unit, x);
 350                 }
 351
 352                 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(p->unit), true);
 353                 if (r < 0)
 354                         return r;
 355
 356                 if ((r = path_add_mount_links(p)) < 0)
 357                         return r;
 358
 359                 if (UNIT(p)->default_dependencies)
 360                         if ((r = path_add_default_dependencies(p)) < 0)
 361                                 return r;
 362         }
 363
 364         return path_verify(p);
 365 }
 366
 367 static void path_dump(Unit *u, FILE *f, const char *prefix) {
 368         Path *p = PATH(u);
 369         PathSpec *s;
 370
 371         assert(p);
 372         assert(f);
 373
 374         fprintf(f,
 375                 "%sPath State: %s\n"
 376                 "%sResult: %s\n"
 377                 "%sUnit: %s\n"
 378                 "%sMakeDirectory: %s\n"
 379                 "%sDirectoryMode: %04o\n",
 380                 prefix, path_state_to_string(p->state),
 381                 prefix, path_result_to_string(p->result),
 382                 prefix, UNIT_DEREF(p->unit)->id,
 383                 prefix, yes_no(p->make_directory),
 384                 prefix, p->directory_mode);
 385
 386         LIST_FOREACH(spec, s, p->specs)
 387                 path_spec_dump(s, f, prefix);
 388 }
 389
 390 static void path_unwatch(Path *p) {
 391         PathSpec *s;
 392
 393         assert(p);
 394
 395         LIST_FOREACH(spec, s, p->specs)
 396                 path_spec_unwatch(s, UNIT(p));
 397 }
 398
 399 static int path_watch(Path *p) {
 400         int r;
 401         PathSpec *s;
 402
 403         assert(p);
 404
 405         LIST_FOREACH(spec, s, p->specs)
 406                 if ((r = path_spec_watch(s, UNIT(p))) < 0)
 407                         return r;
 408
 409         return 0;
 410 }
 411
 412 static void path_set_state(Path *p, PathState state) {
 413         PathState old_state;
 414         assert(p);
 415
 416         old_state = p->state;
 417         p->state = state;
 418
 419         if (state != PATH_WAITING &&
 420             (state != PATH_RUNNING || p->inotify_triggered))
 421                 path_unwatch(p);
 422
 423         if (state != old_state)
 424                 log_debug("%s changed %s -> %s",
 425                           UNIT(p)->id,
 426                           path_state_to_string(old_state),
 427                           path_state_to_string(state));
 428
 429         unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true);
 430 }
 431
 432 static void path_enter_waiting(Path *p, bool initial, bool recheck);
 433
 434 static int path_coldplug(Unit *u) {
 435         Path *p = PATH(u);
 436
 437         assert(p);
 438         assert(p->state == PATH_DEAD);
 439
 440         if (p->deserialized_state != p->state) {
 441
 442                 if (p->deserialized_state == PATH_WAITING ||
 443                     p->deserialized_state == PATH_RUNNING)
 444                         path_enter_waiting(p, true, true);
 445                 else
 446                         path_set_state(p, p->deserialized_state);
 447         }
 448
 449         return 0;
 450 }
 451
 452 static void path_enter_dead(Path *p, PathResult f) {
 453         assert(p);
 454
 455         if (f != PATH_SUCCESS)
 456                 p->result = f;
 457
 458         path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD);
 459 }
 460
 461 static void path_enter_running(Path *p) {
 462         int r;
 463         DBusError error;
 464
 465         assert(p);
 466         dbus_error_init(&error);
 467
 468         /* Don't start job if we are supposed to go down */
 469         if (UNIT(p)->job && UNIT(p)->job->type == JOB_STOP)
 470                 return;
 471
 472         if ((r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_DEREF(p->unit), JOB_REPLACE, true, &error, NULL)) < 0)
 473                 goto fail;
 474
 475         p->inotify_triggered = false;
 476
 477         if ((r = path_watch(p)) < 0)
 478                 goto fail;
 479
 480         path_set_state(p, PATH_RUNNING);
 481         return;
 482
 483 fail:
 484         log_warning("%s failed to queue unit startup job: %s", UNIT(p)->id, bus_error(&error, r));
 485         path_enter_dead(p, PATH_FAILURE_RESOURCES);
 486
 487         dbus_error_free(&error);
 488 }
 489
 490 static bool path_check_good(Path *p, bool initial) {
 491         PathSpec *s;
 492         bool good = false;
 493
 494         assert(p);
 495
 496         LIST_FOREACH(spec, s, p->specs) {
 497                 good = path_spec_check_good(s, initial);
 498
 499                 if (good)
 500                         break;
 501         }
 502
 503         return good;
 504 }
 505
 506 static void path_enter_waiting(Path *p, bool initial, bool recheck) {
 507         int r;
 508
 509         if (recheck)
 510                 if (path_check_good(p, initial)) {
 511                         log_debug("%s got triggered.", UNIT(p)->id);
 512                         path_enter_running(p);
 513                         return;
 514                 }
 515
 516         if ((r = path_watch(p)) < 0)
 517                 goto fail;
 518
 519         /* Hmm, so now we have created inotify watches, but the file
 520          * might have appeared/been removed by now, so we must
 521          * recheck */
 522
 523         if (recheck)
 524                 if (path_check_good(p, false)) {
 525                         log_debug("%s got triggered.", UNIT(p)->id);
 526                         path_enter_running(p);
 527                         return;
 528                 }
 529
 530         path_set_state(p, PATH_WAITING);
 531         return;
 532
 533 fail:
 534         log_warning("%s failed to enter waiting state: %s", UNIT(p)->id, strerror(-r));
 535         path_enter_dead(p, PATH_FAILURE_RESOURCES);
 536 }
 537
 538 static void path_mkdir(Path *p) {
 539         PathSpec *s;
 540
 541         assert(p);
 542
 543         if (!p->make_directory)
 544                 return;
 545
 546         LIST_FOREACH(spec, s, p->specs)
 547                 path_spec_mkdir(s, p->directory_mode);
 548 }
 549
 550 static int path_start(Unit *u) {
 551         Path *p = PATH(u);
 552
 553         assert(p);
 554         assert(p->state == PATH_DEAD || p->state == PATH_FAILED);
 555
 556         if (UNIT_DEREF(p->unit)->load_state != UNIT_LOADED)
 557                 return -ENOENT;
 558
 559         path_mkdir(p);
 560
 561         p->result = PATH_SUCCESS;
 562         path_enter_waiting(p, true, true);
 563
 564         return 0;
 565 }
 566
 567 static int path_stop(Unit *u) {
 568         Path *p = PATH(u);
 569
 570         assert(p);
 571         assert(p->state == PATH_WAITING || p->state == PATH_RUNNING);
 572
 573         path_enter_dead(p, PATH_SUCCESS);
 574         return 0;
 575 }
 576
 577 static int path_serialize(Unit *u, FILE *f, FDSet *fds) {
 578         Path *p = PATH(u);
 579
 580         assert(u);
 581         assert(f);
 582         assert(fds);
 583
 584         unit_serialize_item(u, f, "state", path_state_to_string(p->state));
 585         unit_serialize_item(u, f, "result", path_result_to_string(p->result));
 586
 587         return 0;
 588 }
 589
 590 static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
 591         Path *p = PATH(u);
 592
 593         assert(u);
 594         assert(key);
 595         assert(value);
 596         assert(fds);
 597
 598         if (streq(key, "state")) {
 599                 PathState state;
 600
 601                 if ((state = path_state_from_string(value)) < 0)
 602                         log_debug("Failed to parse state value %s", value);
 603                 else
 604                         p->deserialized_state = state;
 605
 606         } else if (streq(key, "result")) {
 607                 PathResult f;
 608
 609                 f = path_result_from_string(value);
 610                 if (f < 0)
 611                         log_debug("Failed to parse result value %s", value);
 612                 else if (f != PATH_SUCCESS)
 613                         p->result = f;
 614
 615         } else
 616                 log_debug("Unknown serialization key '%s'", key);
 617
 618         return 0;
 619 }
 620
 621 static UnitActiveState path_active_state(Unit *u) {
 622         assert(u);
 623
 624         return state_translation_table[PATH(u)->state];
 625 }
 626
 627 static const char *path_sub_state_to_string(Unit *u) {
 628         assert(u);
 629
 630         return path_state_to_string(PATH(u)->state);
 631 }
 632
 633 static void path_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
 634         Path *p = PATH(u);
 635         PathSpec *s;
 636         int changed;
 637
 638         assert(p);
 639         assert(fd >= 0);
 640
 641         if (p->state != PATH_WAITING &&
 642             p->state != PATH_RUNNING)
 643                 return;
 644
 645         /* log_debug("inotify wakeup on %s.", u->id); */
 646
 647         LIST_FOREACH(spec, s, p->specs)
 648                 if (path_spec_owns_inotify_fd(s, fd))
 649                         break;
 650
 651         if (!s) {
 652                 log_error("Got event on unknown fd.");
 653                 goto fail;
 654         }
 655
 656         changed = path_spec_fd_event(s, events);
 657         if (changed < 0)
 658                 goto fail;
 659
 660         /* If we are already running, then remember that one event was
 661          * dispatched so that we restart the service only if something
 662          * actually changed on disk */
 663         p->inotify_triggered = true;
 664
 665         if (changed)
 666                 path_enter_running(p);
 667         else
 668                 path_enter_waiting(p, false, true);
 669
 670         return;
 671
 672 fail:
 673         path_enter_dead(p, PATH_FAILURE_RESOURCES);
 674 }
 675
 676 void path_unit_notify(Unit *u, UnitActiveState new_state) {
 677         Iterator i;
 678         Unit *k;
 679
 680         if (u->type == UNIT_PATH)
 681                 return;
 682
 683         SET_FOREACH(k, u->dependencies[UNIT_TRIGGERED_BY], i) {
 684                 Path *p;
 685
 686                 if (k->type != UNIT_PATH)
 687                         continue;
 688
 689                 if (k->load_state != UNIT_LOADED)
 690                         continue;
 691
 692                 p = PATH(k);
 693
 694                 if (p->state == PATH_RUNNING && new_state == UNIT_INACTIVE) {
 695                         log_debug("%s got notified about unit deactivation.", UNIT(p)->id);
 696
 697                         /* Hmm, so inotify was triggered since the
 698                          * last activation, so I guess we need to
 699                          * recheck what is going on. */
 700                         path_enter_waiting(p, false, p->inotify_triggered);
 701                 }
 702         }
 703 }
 704
 705 static void path_reset_failed(Unit *u) {
 706         Path *p = PATH(u);
 707
 708         assert(p);
 709
 710         if (p->state == PATH_FAILED)
 711                 path_set_state(p, PATH_DEAD);
 712
 713         p->result = PATH_SUCCESS;
 714 }
 715
 716 static const char* const path_state_table[_PATH_STATE_MAX] = {
 717         [PATH_DEAD] = "dead",
 718         [PATH_WAITING] = "waiting",
 719         [PATH_RUNNING] = "running",
 720         [PATH_FAILED] = "failed"
 721 };
 722
 723 DEFINE_STRING_TABLE_LOOKUP(path_state, PathState);
 724
 725 static const char* const path_type_table[_PATH_TYPE_MAX] = {
 726         [PATH_EXISTS] = "PathExists",
 727         [PATH_EXISTS_GLOB] = "PathExistsGlob",
 728         [PATH_CHANGED] = "PathChanged",
 729         [PATH_MODIFIED] = "PathModified",
 730         [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty"
 731 };
 732
 733 DEFINE_STRING_TABLE_LOOKUP(path_type, PathType);
 734
 735 static const char* const path_result_table[_PATH_RESULT_MAX] = {
 736         [PATH_SUCCESS] = "success",
 737         [PATH_FAILURE_RESOURCES] = "resources"
 738 };
 739
 740 DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult);
 741
 742 const UnitVTable path_vtable = {
 743         .object_size = sizeof(Path),
 744         .sections =
 745                 "Unit\0"
 746                 "Path\0"
 747                 "Install\0",
 748
 749         .init = path_init,
 750         .done = path_done,
 751         .load = path_load,
 752
 753         .coldplug = path_coldplug,
 754
 755         .dump = path_dump,
 756
 757         .start = path_start,
 758         .stop = path_stop,
 759
 760         .serialize = path_serialize,
 761         .deserialize_item = path_deserialize_item,
 762
 763         .active_state = path_active_state,
 764         .sub_state_to_string = path_sub_state_to_string,
 765
 766         .fd_event = path_fd_event,
 767
 768         .reset_failed = path_reset_failed,
 769
 770         .bus_interface = "org.freedesktop.systemd1.Path",
 771         .bus_message_handler = bus_path_message_handler,
 772         .bus_invalidating_properties = bus_path_invalidating_properties
 773 };