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 "path-util.h"
  35 #include "macro.h"
  36 #include "bus-util.h"
  37 #include "bus-error.h"
  38
  39 static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = {
  40         [PATH_DEAD] = UNIT_INACTIVE,
  41         [PATH_WAITING] = UNIT_ACTIVE,
  42         [PATH_RUNNING] = UNIT_ACTIVE,
  43         [PATH_FAILED] = UNIT_FAILED
  44 };
  45
  46 static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
  47
  48 int path_spec_watch(PathSpec *s, sd_event_io_handler_t handler) {
  49
  50         static const int flags_table[_PATH_TYPE_MAX] = {
  51                 [PATH_EXISTS] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB,
  52                 [PATH_EXISTS_GLOB] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB,
  53                 [PATH_CHANGED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO,
  54                 [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,
  55                 [PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO
  56         };
  57
  58         bool exists = false;
  59         char *slash, *oldslash = NULL;
  60         int r;
  61
  62         assert(s);
  63         assert(s->unit);
  64         assert(handler);
  65
  66         path_spec_unwatch(s);
  67
  68         s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
  69         if (s->inotify_fd < 0) {
  70                 r = -errno;
  71                 goto fail;
  72         }
  73
  74         r = sd_event_add_io(s->unit->manager->event, &s->event_source, s->inotify_fd, EPOLLIN, handler, s);
  75         if (r < 0)
  76                 goto fail;
  77
  78         /* This assumes the path was passed through path_kill_slashes()! */
  79
  80         for (slash = strchr(s->path, '/'); ; slash = strchr(slash+1, '/')) {
  81                 char *cut = NULL;
  82                 int flags;
  83                 char tmp;
  84
  85                 if (slash) {
  86                         cut = slash + (slash == s->path);
  87                         tmp = *cut;
  88                         *cut = '\0';
  89
  90                         flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO;
  91                 } else
  92                         flags = flags_table[s->type];
  93
  94                 r = inotify_add_watch(s->inotify_fd, s->path, flags);
  95                 if (r < 0) {
  96                         if (errno == EACCES || errno == ENOENT) {
  97                                 if (cut)
  98                                         *cut = tmp;
  99                                 break;
 100                         }
 101
 102                         log_warning("Failed to add watch on %s: %s", s->path,
 103                                     errno == ENOSPC ? "too many watches" : strerror(-r));
 104                         r = -errno;
 105                         if (cut)
 106                                 *cut = tmp;
 107                         goto fail;
 108                 } else {
 109                         exists = true;
 110
 111                         /* Path exists, we don't need to watch parent
 112                            too closely. */
 113                         if (oldslash) {
 114                                 char *cut2 = oldslash + (oldslash == s->path);
 115                                 char tmp2 = *cut2;
 116                                 *cut2 = '\0';
 117
 118                                 inotify_add_watch(s->inotify_fd, s->path, IN_MOVE_SELF);
 119                                 /* Error is ignored, the worst can happen is
 120                                    we get spurious events. */
 121
 122                                 *cut2 = tmp2;
 123                         }
 124                 }
 125
 126                 if (cut)
 127                         *cut = tmp;
 128
 129                 if (slash)
 130                         oldslash = slash;
 131                 else {
 132                         /* whole path has been iterated over */
 133                         s->primary_wd = r;
 134                         break;
 135                 }
 136         }
 137
 138         if (!exists) {
 139                 log_error_errno(errno, "Failed to add watch on any of the components of %s: %m",
 140                           s->path);
 141                 r = -errno; /* either EACCESS or ENOENT */
 142                 goto fail;
 143         }
 144
 145         return 0;
 146
 147 fail:
 148         path_spec_unwatch(s);
 149         return r;
 150 }
 151
 152 void path_spec_unwatch(PathSpec *s) {
 153         assert(s);
 154
 155         s->event_source = sd_event_source_unref(s->event_source);
 156         s->inotify_fd = safe_close(s->inotify_fd);
 157 }
 158
 159 int path_spec_fd_event(PathSpec *s, uint32_t revents) {
 160         _cleanup_free_ uint8_t *buf = NULL;
 161         struct inotify_event *e;
 162         ssize_t k;
 163         int l;
 164         int r = 0;
 165
 166         if (revents != EPOLLIN) {
 167                 log_error("Got invalid poll event on inotify.");
 168                 return -EINVAL;
 169         }
 170
 171         if (ioctl(s->inotify_fd, FIONREAD, &l) < 0)
 172                 return log_error_errno(errno, "FIONREAD failed: %m");
 173
 174         assert(l > 0);
 175
 176         buf = malloc(l);
 177         if (!buf)
 178                 return log_oom();
 179
 180         k = read(s->inotify_fd, buf, l);
 181         if (k < 0)
 182                 return log_error_errno(errno, "Failed to read inotify event: %m");
 183
 184         e = (struct inotify_event*) buf;
 185
 186         while (k > 0) {
 187                 size_t step;
 188
 189                 if ((s->type == PATH_CHANGED || s->type == PATH_MODIFIED) &&
 190                     s->primary_wd == e->wd)
 191                         r = 1;
 192
 193                 step = sizeof(struct inotify_event) + e->len;
 194                 assert(step <= (size_t) k);
 195
 196                 e = (struct inotify_event*) ((uint8_t*) e + step);
 197                 k -= step;
 198         }
 199
 200         return r;
 201 }
 202
 203 static bool path_spec_check_good(PathSpec *s, bool initial) {
 204         bool good = false;
 205
 206         switch (s->type) {
 207
 208         case PATH_EXISTS:
 209                 good = access(s->path, F_OK) >= 0;
 210                 break;
 211
 212         case PATH_EXISTS_GLOB:
 213                 good = glob_exists(s->path) > 0;
 214                 break;
 215
 216         case PATH_DIRECTORY_NOT_EMPTY: {
 217                 int k;
 218
 219                 k = dir_is_empty(s->path);
 220                 good = !(k == -ENOENT || k > 0);
 221                 break;
 222         }
 223
 224         case PATH_CHANGED:
 225         case PATH_MODIFIED: {
 226                 bool b;
 227
 228                 b = access(s->path, F_OK) >= 0;
 229                 good = !initial && b != s->previous_exists;
 230                 s->previous_exists = b;
 231                 break;
 232         }
 233
 234         default:
 235                 ;
 236         }
 237
 238         return good;
 239 }
 240
 241 static void path_spec_mkdir(PathSpec *s, mode_t mode) {
 242         int r;
 243
 244         if (s->type == PATH_EXISTS || s->type == PATH_EXISTS_GLOB)
 245                 return;
 246
 247         r = mkdir_p_label(s->path, mode);
 248         if (r < 0)
 249                 log_warning_errno(r, "mkdir(%s) failed: %m", s->path);
 250 }
 251
 252 static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) {
 253         fprintf(f,
 254                 "%s%s: %s\n",
 255                 prefix,
 256                 path_type_to_string(s->type),
 257                 s->path);
 258 }
 259
 260 void path_spec_done(PathSpec *s) {
 261         assert(s);
 262         assert(s->inotify_fd == -1);
 263
 264         free(s->path);
 265 }
 266
 267 static void path_init(Unit *u) {
 268         Path *p = PATH(u);
 269
 270         assert(u);
 271         assert(u->load_state == UNIT_STUB);
 272
 273         p->directory_mode = 0755;
 274 }
 275
 276 void path_free_specs(Path *p) {
 277         PathSpec *s;
 278
 279         assert(p);
 280
 281         while ((s = p->specs)) {
 282                 path_spec_unwatch(s);
 283                 LIST_REMOVE(spec, p->specs, s);
 284                 path_spec_done(s);
 285                 free(s);
 286         }
 287 }
 288
 289 static void path_done(Unit *u) {
 290         Path *p = PATH(u);
 291
 292         assert(p);
 293
 294         path_free_specs(p);
 295 }
 296
 297 static int path_add_mount_links(Path *p) {
 298         PathSpec *s;
 299         int r;
 300
 301         assert(p);
 302
 303         LIST_FOREACH(spec, s, p->specs) {
 304                 r = unit_require_mounts_for(UNIT(p), s->path);
 305                 if (r < 0)
 306                         return r;
 307         }
 308
 309         return 0;
 310 }
 311
 312 static int path_verify(Path *p) {
 313         assert(p);
 314
 315         if (UNIT(p)->load_state != UNIT_LOADED)
 316                 return 0;
 317
 318         if (!p->specs) {
 319                 log_unit_error(UNIT(p)->id,
 320                                "%s lacks path setting. Refusing.", UNIT(p)->id);
 321                 return -EINVAL;
 322         }
 323
 324         return 0;
 325 }
 326
 327 static int path_add_default_dependencies(Path *p) {
 328         int r;
 329
 330         assert(p);
 331
 332         r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE,
 333                                         SPECIAL_PATHS_TARGET, NULL, true);
 334         if (r < 0)
 335                 return r;
 336
 337         if (UNIT(p)->manager->running_as == SYSTEMD_SYSTEM) {
 338                 r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES,
 339                                                       SPECIAL_SYSINIT_TARGET, NULL, true);
 340                 if (r < 0)
 341                         return r;
 342         }
 343
 344         return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS,
 345                                                  SPECIAL_SHUTDOWN_TARGET, NULL, true);
 346 }
 347
 348 static int path_load(Unit *u) {
 349         Path *p = PATH(u);
 350         int r;
 351
 352         assert(u);
 353         assert(u->load_state == UNIT_STUB);
 354
 355         r = unit_load_fragment_and_dropin(u);
 356         if (r < 0)
 357                 return r;
 358
 359         if (u->load_state == UNIT_LOADED) {
 360
 361                 if (set_isempty(u->dependencies[UNIT_TRIGGERS])) {
 362                         Unit *x;
 363
 364                         r = unit_load_related_unit(u, ".service", &x);
 365                         if (r < 0)
 366                                 return r;
 367
 368                         r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, x, true);
 369                         if (r < 0)
 370                                 return r;
 371                 }
 372
 373                 r = path_add_mount_links(p);
 374                 if (r < 0)
 375                         return r;
 376
 377                 if (UNIT(p)->default_dependencies) {
 378                         r = path_add_default_dependencies(p);
 379                         if (r < 0)
 380                                 return r;
 381                 }
 382         }
 383
 384         return path_verify(p);
 385 }
 386
 387 static void path_dump(Unit *u, FILE *f, const char *prefix) {
 388         Path *p = PATH(u);
 389         Unit *trigger;
 390         PathSpec *s;
 391
 392         assert(p);
 393         assert(f);
 394
 395         trigger = UNIT_TRIGGER(u);
 396
 397         fprintf(f,
 398                 "%sPath State: %s\n"
 399                 "%sResult: %s\n"
 400                 "%sUnit: %s\n"
 401                 "%sMakeDirectory: %s\n"
 402                 "%sDirectoryMode: %04o\n",
 403                 prefix, path_state_to_string(p->state),
 404                 prefix, path_result_to_string(p->result),
 405                 prefix, trigger ? trigger->id : "n/a",
 406                 prefix, yes_no(p->make_directory),
 407                 prefix, p->directory_mode);
 408
 409         LIST_FOREACH(spec, s, p->specs)
 410                 path_spec_dump(s, f, prefix);
 411 }
 412
 413 static void path_unwatch(Path *p) {
 414         PathSpec *s;
 415
 416         assert(p);
 417
 418         LIST_FOREACH(spec, s, p->specs)
 419                 path_spec_unwatch(s);
 420 }
 421
 422 static int path_watch(Path *p) {
 423         int r;
 424         PathSpec *s;
 425
 426         assert(p);
 427
 428         LIST_FOREACH(spec, s, p->specs) {
 429                 r = path_spec_watch(s, path_dispatch_io);
 430                 if (r < 0)
 431                         return r;
 432         }
 433
 434         return 0;
 435 }
 436
 437 static void path_set_state(Path *p, PathState state) {
 438         PathState old_state;
 439         assert(p);
 440
 441         old_state = p->state;
 442         p->state = state;
 443
 444         if (state != PATH_WAITING &&
 445             (state != PATH_RUNNING || p->inotify_triggered))
 446                 path_unwatch(p);
 447
 448         if (state != old_state)
 449                 log_debug("%s changed %s -> %s",
 450                           UNIT(p)->id,
 451                           path_state_to_string(old_state),
 452                           path_state_to_string(state));
 453
 454         unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true);
 455 }
 456
 457 static void path_enter_waiting(Path *p, bool initial, bool recheck);
 458
 459 static int path_coldplug(Unit *u) {
 460         Path *p = PATH(u);
 461
 462         assert(p);
 463         assert(p->state == PATH_DEAD);
 464
 465         if (p->deserialized_state != p->state) {
 466
 467                 if (p->deserialized_state == PATH_WAITING ||
 468                     p->deserialized_state == PATH_RUNNING)
 469                         path_enter_waiting(p, true, true);
 470                 else
 471                         path_set_state(p, p->deserialized_state);
 472         }
 473
 474         return 0;
 475 }
 476
 477 static void path_enter_dead(Path *p, PathResult f) {
 478         assert(p);
 479
 480         if (f != PATH_SUCCESS)
 481                 p->result = f;
 482
 483         path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD);
 484 }
 485
 486 static void path_enter_running(Path *p) {
 487         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
 488         int r;
 489
 490         assert(p);
 491
 492         /* Don't start job if we are supposed to go down */
 493         if (unit_stop_pending(UNIT(p)))
 494                 return;
 495
 496         r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_TRIGGER(UNIT(p)),
 497                             JOB_REPLACE, true, &error, NULL);
 498         if (r < 0)
 499                 goto fail;
 500
 501         p->inotify_triggered = false;
 502
 503         r = path_watch(p);
 504         if (r < 0)
 505                 goto fail;
 506
 507         path_set_state(p, PATH_RUNNING);
 508         return;
 509
 510 fail:
 511         log_warning("%s failed to queue unit startup job: %s",
 512                     UNIT(p)->id, bus_error_message(&error, r));
 513         path_enter_dead(p, PATH_FAILURE_RESOURCES);
 514 }
 515
 516 static bool path_check_good(Path *p, bool initial) {
 517         PathSpec *s;
 518         bool good = false;
 519
 520         assert(p);
 521
 522         LIST_FOREACH(spec, s, p->specs) {
 523                 good = path_spec_check_good(s, initial);
 524
 525                 if (good)
 526                         break;
 527         }
 528
 529         return good;
 530 }
 531
 532 static void path_enter_waiting(Path *p, bool initial, bool recheck) {
 533         int r;
 534
 535         if (recheck)
 536                 if (path_check_good(p, initial)) {
 537                         log_debug("%s got triggered.", UNIT(p)->id);
 538                         path_enter_running(p);
 539                         return;
 540                 }
 541
 542         r = path_watch(p);
 543         if (r < 0)
 544                 goto fail;
 545
 546         /* Hmm, so now we have created inotify watches, but the file
 547          * might have appeared/been removed by now, so we must
 548          * recheck */
 549
 550         if (recheck)
 551                 if (path_check_good(p, false)) {
 552                         log_debug("%s got triggered.", UNIT(p)->id);
 553                         path_enter_running(p);
 554                         return;
 555                 }
 556
 557         path_set_state(p, PATH_WAITING);
 558         return;
 559
 560 fail:
 561         log_warning_errno(r, "%s failed to enter waiting state: %m", UNIT(p)->id);
 562         path_enter_dead(p, PATH_FAILURE_RESOURCES);
 563 }
 564
 565 static void path_mkdir(Path *p) {
 566         PathSpec *s;
 567
 568         assert(p);
 569
 570         if (!p->make_directory)
 571                 return;
 572
 573         LIST_FOREACH(spec, s, p->specs)
 574                 path_spec_mkdir(s, p->directory_mode);
 575 }
 576
 577 static int path_start(Unit *u) {
 578         Path *p = PATH(u);
 579
 580         assert(p);
 581         assert(p->state == PATH_DEAD || p->state == PATH_FAILED);
 582
 583         if (UNIT_TRIGGER(u)->load_state != UNIT_LOADED)
 584                 return -ENOENT;
 585
 586         path_mkdir(p);
 587
 588         p->result = PATH_SUCCESS;
 589         path_enter_waiting(p, true, true);
 590
 591         return 0;
 592 }
 593
 594 static int path_stop(Unit *u) {
 595         Path *p = PATH(u);
 596
 597         assert(p);
 598         assert(p->state == PATH_WAITING || p->state == PATH_RUNNING);
 599
 600         path_enter_dead(p, PATH_SUCCESS);
 601         return 0;
 602 }
 603
 604 static int path_serialize(Unit *u, FILE *f, FDSet *fds) {
 605         Path *p = PATH(u);
 606
 607         assert(u);
 608         assert(f);
 609         assert(fds);
 610
 611         unit_serialize_item(u, f, "state", path_state_to_string(p->state));
 612         unit_serialize_item(u, f, "result", path_result_to_string(p->result));
 613
 614         return 0;
 615 }
 616
 617 static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
 618         Path *p = PATH(u);
 619
 620         assert(u);
 621         assert(key);
 622         assert(value);
 623         assert(fds);
 624
 625         if (streq(key, "state")) {
 626                 PathState state;
 627
 628                 state = path_state_from_string(value);
 629                 if (state < 0)
 630                         log_debug("Failed to parse state value %s", value);
 631                 else
 632                         p->deserialized_state = state;
 633
 634         } else if (streq(key, "result")) {
 635                 PathResult f;
 636
 637                 f = path_result_from_string(value);
 638                 if (f < 0)
 639                         log_debug("Failed to parse result value %s", value);
 640                 else if (f != PATH_SUCCESS)
 641                         p->result = f;
 642
 643         } else
 644                 log_debug("Unknown serialization key '%s'", key);
 645
 646         return 0;
 647 }
 648
 649 _pure_ static UnitActiveState path_active_state(Unit *u) {
 650         assert(u);
 651
 652         return state_translation_table[PATH(u)->state];
 653 }
 654
 655 _pure_ static const char *path_sub_state_to_string(Unit *u) {
 656         assert(u);
 657
 658         return path_state_to_string(PATH(u)->state);
 659 }
 660
 661 static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
 662         PathSpec *s = userdata;
 663         Path *p;
 664         int changed;
 665
 666         assert(s);
 667         assert(s->unit);
 668         assert(fd >= 0);
 669
 670         p = PATH(s->unit);
 671
 672         if (p->state != PATH_WAITING &&
 673             p->state != PATH_RUNNING)
 674                 return 0;
 675
 676         /* log_debug("inotify wakeup on %s.", u->id); */
 677
 678         LIST_FOREACH(spec, s, p->specs)
 679                 if (path_spec_owns_inotify_fd(s, fd))
 680                         break;
 681
 682         if (!s) {
 683                 log_error("Got event on unknown fd.");
 684                 goto fail;
 685         }
 686
 687         changed = path_spec_fd_event(s, revents);
 688         if (changed < 0)
 689                 goto fail;
 690
 691         /* If we are already running, then remember that one event was
 692          * dispatched so that we restart the service only if something
 693          * actually changed on disk */
 694         p->inotify_triggered = true;
 695
 696         if (changed)
 697                 path_enter_running(p);
 698         else
 699                 path_enter_waiting(p, false, true);
 700
 701         return 0;
 702
 703 fail:
 704         path_enter_dead(p, PATH_FAILURE_RESOURCES);
 705         return 0;
 706 }
 707
 708 static void path_trigger_notify(Unit *u, Unit *other) {
 709         Path *p = PATH(u);
 710
 711         assert(u);
 712         assert(other);
 713
 714         /* Invoked whenever the unit we trigger changes state or gains
 715          * or loses a job */
 716
 717         if (other->load_state != UNIT_LOADED)
 718                 return;
 719
 720         if (p->state == PATH_RUNNING &&
 721             UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) {
 722                 log_unit_debug(UNIT(p)->id,
 723                                "%s got notified about unit deactivation.",
 724                                UNIT(p)->id);
 725
 726                 /* Hmm, so inotify was triggered since the
 727                  * last activation, so I guess we need to
 728                  * recheck what is going on. */
 729                 path_enter_waiting(p, false, p->inotify_triggered);
 730         }
 731 }
 732
 733 static void path_reset_failed(Unit *u) {
 734         Path *p = PATH(u);
 735
 736         assert(p);
 737
 738         if (p->state == PATH_FAILED)
 739                 path_set_state(p, PATH_DEAD);
 740
 741         p->result = PATH_SUCCESS;
 742 }
 743
 744 static const char* const path_state_table[_PATH_STATE_MAX] = {
 745         [PATH_DEAD] = "dead",
 746         [PATH_WAITING] = "waiting",
 747         [PATH_RUNNING] = "running",
 748         [PATH_FAILED] = "failed"
 749 };
 750
 751 DEFINE_STRING_TABLE_LOOKUP(path_state, PathState);
 752
 753 static const char* const path_type_table[_PATH_TYPE_MAX] = {
 754         [PATH_EXISTS] = "PathExists",
 755         [PATH_EXISTS_GLOB] = "PathExistsGlob",
 756         [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty",
 757         [PATH_CHANGED] = "PathChanged",
 758         [PATH_MODIFIED] = "PathModified",
 759 };
 760
 761 DEFINE_STRING_TABLE_LOOKUP(path_type, PathType);
 762
 763 static const char* const path_result_table[_PATH_RESULT_MAX] = {
 764         [PATH_SUCCESS] = "success",
 765         [PATH_FAILURE_RESOURCES] = "resources",
 766 };
 767
 768 DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult);
 769
 770 const UnitVTable path_vtable = {
 771         .object_size = sizeof(Path),
 772
 773         .sections =
 774                 "Unit\0"
 775                 "Path\0"
 776                 "Install\0",
 777
 778         .init = path_init,
 779         .done = path_done,
 780         .load = path_load,
 781
 782         .coldplug = path_coldplug,
 783
 784         .dump = path_dump,
 785
 786         .start = path_start,
 787         .stop = path_stop,
 788
 789         .serialize = path_serialize,
 790         .deserialize_item = path_deserialize_item,
 791
 792         .active_state = path_active_state,
 793         .sub_state_to_string = path_sub_state_to_string,
 794
 795         .trigger_notify = path_trigger_notify,
 796
 797         .reset_failed = path_reset_failed,
 798
 799         .bus_interface = "org.freedesktop.systemd1.Path",
 800         .bus_vtable = bus_path_vtable
 801 };