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 #include "macro.h"
  37
  38 static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = {
  39         [PATH_DEAD] = UNIT_INACTIVE,
  40         [PATH_WAITING] = UNIT_ACTIVE,
  41         [PATH_RUNNING] = UNIT_ACTIVE,
  42         [PATH_FAILED] = UNIT_FAILED
  43 };
  44
  45 int path_spec_watch(PathSpec *s, Unit *u) {
  46
  47         static const int flags_table[_PATH_TYPE_MAX] = {
  48                 [PATH_EXISTS] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB,
  49                 [PATH_EXISTS_GLOB] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB,
  50                 [PATH_CHANGED] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CLOSE_WRITE|IN_CREATE|IN_DELETE|IN_MOVED_FROM|IN_MOVED_TO,
  51                 [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,
  52                 [PATH_DIRECTORY_NOT_EMPTY] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO
  53         };
  54
  55         bool exists = false;
  56         char *slash, *oldslash = NULL;
  57         int r;
  58
  59         assert(u);
  60         assert(s);
  61
  62         path_spec_unwatch(s, u);
  63
  64         s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
  65         if (s->inotify_fd < 0) {
  66                 r = -errno;
  67                 goto fail;
  68         }
  69
  70         r = unit_watch_fd(u, s->inotify_fd, EPOLLIN, &s->watch);
  71         if (r < 0)
  72                 goto fail;
  73
  74         /* This assumes the path was passed through path_kill_slashes()! */
  75
  76         for (slash = strchr(s->path, '/'); ; slash = strchr(slash+1, '/')) {
  77                 char *cut = NULL;
  78                 int flags;
  79                 char tmp;
  80
  81                 if (slash) {
  82                         cut = slash + (slash == s->path);
  83                         tmp = *cut;
  84                         *cut = '\0';
  85
  86                         flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO;
  87                 } else
  88                         flags = flags_table[s->type];
  89
  90                 r = inotify_add_watch(s->inotify_fd, s->path, flags);
  91                 if (r < 0) {
  92                         if (errno == EACCES || errno == ENOENT) {
  93                                 if (cut)
  94                                         *cut = tmp;
  95                                 break;
  96                         }
  97
  98                         log_warning("Failed to add watch on %s: %m", s->path);
  99                         r = -errno;
 100                         if (cut)
 101                                 *cut = tmp;
 102                         goto fail;
 103                 } else {
 104                         exists = true;
 105
 106                         /* Path exists, we don't need to watch parent
 107                            too closely. */
 108                         if (oldslash) {
 109                                 char *cut2 = oldslash + (oldslash == s->path);
 110                                 char tmp2 = *cut2;
 111                                 *cut2 = '\0';
 112
 113                                 inotify_add_watch(s->inotify_fd, s->path, IN_MOVE_SELF);
 114                                 /* Error is ignored, the worst can happen is
 115                                    we get spurious events. */
 116
 117                                 *cut2 = tmp2;
 118                         }
 119                 }
 120
 121                 if (cut)
 122                         *cut = tmp;
 123
 124                 if (slash)
 125                         oldslash = slash;
 126                 else {
 127                         /* whole path has been iterated over */
 128                         s->primary_wd = r;
 129                         break;
 130                 }
 131         }
 132
 133         if (!exists) {
 134                 log_error("Failed to add watch on any of the components of %s: %m",
 135                           s->path);
 136                 r = -errno; /* either EACCESS or ENOENT */
 137                 goto fail;
 138         }
 139
 140         return 0;
 141
 142 fail:
 143         path_spec_unwatch(s, u);
 144         return r;
 145 }
 146
 147 void path_spec_unwatch(PathSpec *s, Unit *u) {
 148
 149         if (s->inotify_fd < 0)
 150                 return;
 151
 152         unit_unwatch_fd(u, &s->watch);
 153
 154         close_nointr_nofail(s->inotify_fd);
 155         s->inotify_fd = -1;
 156 }
 157
 158 int path_spec_fd_event(PathSpec *s, uint32_t events) {
 159         uint8_t _cleanup_free_ *buf = NULL;
 160         struct inotify_event *e;
 161         ssize_t k;
 162         int l;
 163         int r = 0;
 164
 165         if (events != EPOLLIN) {
 166                 log_error("Got invalid poll event on inotify.");
 167                 return -EINVAL;
 168         }
 169
 170         if (ioctl(s->inotify_fd, FIONREAD, &l) < 0) {
 171                 log_error("FIONREAD failed: %m");
 172                 return -errno;
 173         }
 174
 175         assert(l > 0);
 176
 177         buf = malloc(l);
 178         if (!buf)
 179                 return log_oom();
 180
 181         k = read(s->inotify_fd, buf, l);
 182         if (k < 0) {
 183                 log_error("Failed to read inotify event: %m");
 184                 return -errno;
 185         }
 186
 187         e = (struct inotify_event*) buf;
 188
 189         while (k > 0) {
 190                 size_t step;
 191
 192                 if ((s->type == PATH_CHANGED || s->type == PATH_MODIFIED) &&
 193                     s->primary_wd == e->wd)
 194                         r = 1;
 195
 196                 step = sizeof(struct inotify_event) + e->len;
 197                 assert(step <= (size_t) k);
 198
 199                 e = (struct inotify_event*) ((uint8_t*) e + step);
 200                 k -= step;
 201         }
 202
 203         return r;
 204 }
 205
 206 static bool path_spec_check_good(PathSpec *s, bool initial) {
 207         bool good = false;
 208
 209         switch (s->type) {
 210
 211         case PATH_EXISTS:
 212                 good = access(s->path, F_OK) >= 0;
 213                 break;
 214
 215         case PATH_EXISTS_GLOB:
 216                 good = glob_exists(s->path) > 0;
 217                 break;
 218
 219         case PATH_DIRECTORY_NOT_EMPTY: {
 220                 int k;
 221
 222                 k = dir_is_empty(s->path);
 223                 good = !(k == -ENOENT || k > 0);
 224                 break;
 225         }
 226
 227         case PATH_CHANGED:
 228         case PATH_MODIFIED: {
 229                 bool b;
 230
 231                 b = access(s->path, F_OK) >= 0;
 232                 good = !initial && b != s->previous_exists;
 233                 s->previous_exists = b;
 234                 break;
 235         }
 236
 237         default:
 238                 ;
 239         }
 240
 241         return good;
 242 }
 243
 244 static bool path_spec_startswith(PathSpec *s, const char *what) {
 245         return path_startswith(s->path, what);
 246 }
 247
 248 static void path_spec_mkdir(PathSpec *s, mode_t mode) {
 249         int r;
 250
 251         if (s->type == PATH_EXISTS || s->type == PATH_EXISTS_GLOB)
 252                 return;
 253
 254         r = mkdir_p_label(s->path, mode);
 255         if (r < 0)
 256                 log_warning("mkdir(%s) failed: %s", s->path, strerror(-r));
 257 }
 258
 259 static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) {
 260         fprintf(f,
 261                 "%s%s: %s\n",
 262                 prefix,
 263                 path_type_to_string(s->type),
 264                 s->path);
 265 }
 266
 267 void path_spec_done(PathSpec *s) {
 268         assert(s);
 269         assert(s->inotify_fd == -1);
 270
 271         free(s->path);
 272 }
 273
 274 static void path_init(Unit *u) {
 275         Path *p = PATH(u);
 276
 277         assert(u);
 278         assert(u->load_state == UNIT_STUB);
 279
 280         p->directory_mode = 0755;
 281 }
 282
 283 void path_free_specs(Path *p) {
 284         PathSpec *s;
 285
 286         assert(p);
 287
 288         while ((s = p->specs)) {
 289                 path_spec_unwatch(s, UNIT(p));
 290                 LIST_REMOVE(PathSpec, spec, p->specs, s);
 291                 path_spec_done(s);
 292                 free(s);
 293         }
 294 }
 295
 296 static void path_done(Unit *u) {
 297         Path *p = PATH(u);
 298
 299         assert(p);
 300
 301         unit_ref_unset(&p->unit);
 302         path_free_specs(p);
 303 }
 304
 305 int path_add_one_mount_link(Path *p, Mount *m) {
 306         PathSpec *s;
 307         int r;
 308
 309         assert(p);
 310         assert(m);
 311
 312         if (UNIT(p)->load_state != UNIT_LOADED ||
 313             UNIT(m)->load_state != UNIT_LOADED)
 314                 return 0;
 315
 316         LIST_FOREACH(spec, s, p->specs) {
 317                 if (!path_spec_startswith(s, m->where))
 318                         continue;
 319
 320                 r = unit_add_two_dependencies(UNIT(p), UNIT_AFTER, UNIT_REQUIRES,
 321                                               UNIT(m), true);
 322                 if (r < 0)
 323                         return r;
 324         }
 325
 326         return 0;
 327 }
 328
 329 static int path_add_mount_links(Path *p) {
 330         Unit *other;
 331         int r;
 332
 333         assert(p);
 334
 335         LIST_FOREACH(units_by_type, other, UNIT(p)->manager->units_by_type[UNIT_MOUNT]) {
 336                 r = path_add_one_mount_link(p, MOUNT(other));
 337                 if (r < 0)
 338                         return r;
 339         }
 340
 341         return 0;
 342 }
 343
 344 static int path_verify(Path *p) {
 345         assert(p);
 346
 347         if (UNIT(p)->load_state != UNIT_LOADED)
 348                 return 0;
 349
 350         if (!p->specs) {
 351                 log_error_unit(UNIT(p)->id,
 352                                "%s lacks path setting. Refusing.", UNIT(p)->id);
 353                 return -EINVAL;
 354         }
 355
 356         return 0;
 357 }
 358
 359 static int path_add_default_dependencies(Path *p) {
 360         int r;
 361
 362         assert(p);
 363
 364         r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE,
 365                                         SPECIAL_PATHS_TARGET, NULL, true);
 366         if (r < 0)
 367                 return r;
 368
 369         if (UNIT(p)->manager->running_as == SYSTEMD_SYSTEM) {
 370                 r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES,
 371                                                       SPECIAL_SYSINIT_TARGET, NULL, true);
 372                 if (r < 0)
 373                         return r;
 374         }
 375
 376         return unit_add_two_dependencies_by_name(UNIT(p), UNIT_BEFORE, UNIT_CONFLICTS,
 377                                                  SPECIAL_SHUTDOWN_TARGET, NULL, true);
 378 }
 379
 380 static int path_load(Unit *u) {
 381         Path *p = PATH(u);
 382         int r;
 383
 384         assert(u);
 385         assert(u->load_state == UNIT_STUB);
 386
 387         r = unit_load_fragment_and_dropin(u);
 388         if (r < 0)
 389                 return r;
 390
 391         if (u->load_state == UNIT_LOADED) {
 392
 393                 if (!UNIT_DEREF(p->unit)) {
 394                         Unit *x;
 395
 396                         r = unit_load_related_unit(u, ".service", &x);
 397                         if (r < 0)
 398                                 return r;
 399
 400                         unit_ref_set(&p->unit, x);
 401                 }
 402
 403                 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS,
 404                                               UNIT_DEREF(p->unit), true);
 405                 if (r < 0)
 406                         return r;
 407
 408                 r = path_add_mount_links(p);
 409                 if (r < 0)
 410                         return r;
 411
 412                 if (UNIT(p)->default_dependencies) {
 413                         r = path_add_default_dependencies(p);
 414                         if (r < 0)
 415                                 return r;
 416                 }
 417         }
 418
 419         return path_verify(p);
 420 }
 421
 422 static void path_dump(Unit *u, FILE *f, const char *prefix) {
 423         Path *p = PATH(u);
 424         PathSpec *s;
 425
 426         assert(p);
 427         assert(f);
 428
 429         fprintf(f,
 430                 "%sPath State: %s\n"
 431                 "%sResult: %s\n"
 432                 "%sUnit: %s\n"
 433                 "%sMakeDirectory: %s\n"
 434                 "%sDirectoryMode: %04o\n",
 435                 prefix, path_state_to_string(p->state),
 436                 prefix, path_result_to_string(p->result),
 437                 prefix, UNIT_DEREF(p->unit)->id,
 438                 prefix, yes_no(p->make_directory),
 439                 prefix, p->directory_mode);
 440
 441         LIST_FOREACH(spec, s, p->specs)
 442                 path_spec_dump(s, f, prefix);
 443 }
 444
 445 static void path_unwatch(Path *p) {
 446         PathSpec *s;
 447
 448         assert(p);
 449
 450         LIST_FOREACH(spec, s, p->specs)
 451                 path_spec_unwatch(s, UNIT(p));
 452 }
 453
 454 static int path_watch(Path *p) {
 455         int r;
 456         PathSpec *s;
 457
 458         assert(p);
 459
 460         LIST_FOREACH(spec, s, p->specs) {
 461                 r = path_spec_watch(s, UNIT(p));
 462                 if (r < 0)
 463                         return r;
 464         }
 465
 466         return 0;
 467 }
 468
 469 static void path_set_state(Path *p, PathState state) {
 470         PathState old_state;
 471         assert(p);
 472
 473         old_state = p->state;
 474         p->state = state;
 475
 476         if (state != PATH_WAITING &&
 477             (state != PATH_RUNNING || p->inotify_triggered))
 478                 path_unwatch(p);
 479
 480         if (state != old_state)
 481                 log_debug("%s changed %s -> %s",
 482                           UNIT(p)->id,
 483                           path_state_to_string(old_state),
 484                           path_state_to_string(state));
 485
 486         unit_notify(UNIT(p), state_translation_table[old_state], state_translation_table[state], true);
 487 }
 488
 489 static void path_enter_waiting(Path *p, bool initial, bool recheck);
 490
 491 static int path_coldplug(Unit *u) {
 492         Path *p = PATH(u);
 493
 494         assert(p);
 495         assert(p->state == PATH_DEAD);
 496
 497         if (p->deserialized_state != p->state) {
 498
 499                 if (p->deserialized_state == PATH_WAITING ||
 500                     p->deserialized_state == PATH_RUNNING)
 501                         path_enter_waiting(p, true, true);
 502                 else
 503                         path_set_state(p, p->deserialized_state);
 504         }
 505
 506         return 0;
 507 }
 508
 509 static void path_enter_dead(Path *p, PathResult f) {
 510         assert(p);
 511
 512         if (f != PATH_SUCCESS)
 513                 p->result = f;
 514
 515         path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD);
 516 }
 517
 518 static void path_enter_running(Path *p) {
 519         int r;
 520         DBusError error;
 521
 522         assert(p);
 523         dbus_error_init(&error);
 524
 525         /* Don't start job if we are supposed to go down */
 526         if (UNIT(p)->job && UNIT(p)->job->type == JOB_STOP)
 527                 return;
 528
 529         r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_DEREF(p->unit),
 530                             JOB_REPLACE, true, &error, NULL);
 531         if (r < 0)
 532                 goto fail;
 533
 534         p->inotify_triggered = false;
 535
 536         r = path_watch(p);
 537         if (r < 0)
 538                 goto fail;
 539
 540         path_set_state(p, PATH_RUNNING);
 541         return;
 542
 543 fail:
 544         log_warning("%s failed to queue unit startup job: %s",
 545                     UNIT(p)->id, bus_error(&error, r));
 546         path_enter_dead(p, PATH_FAILURE_RESOURCES);
 547
 548         dbus_error_free(&error);
 549 }
 550
 551 static bool path_check_good(Path *p, bool initial) {
 552         PathSpec *s;
 553         bool good = false;
 554
 555         assert(p);
 556
 557         LIST_FOREACH(spec, s, p->specs) {
 558                 good = path_spec_check_good(s, initial);
 559
 560                 if (good)
 561                         break;
 562         }
 563
 564         return good;
 565 }
 566
 567 static void path_enter_waiting(Path *p, bool initial, bool recheck) {
 568         int r;
 569
 570         if (recheck)
 571                 if (path_check_good(p, initial)) {
 572                         log_debug("%s got triggered.", UNIT(p)->id);
 573                         path_enter_running(p);
 574                         return;
 575                 }
 576
 577         r = path_watch(p);
 578         if (r < 0)
 579                 goto fail;
 580
 581         /* Hmm, so now we have created inotify watches, but the file
 582          * might have appeared/been removed by now, so we must
 583          * recheck */
 584
 585         if (recheck)
 586                 if (path_check_good(p, false)) {
 587                         log_debug("%s got triggered.", UNIT(p)->id);
 588                         path_enter_running(p);
 589                         return;
 590                 }
 591
 592         path_set_state(p, PATH_WAITING);
 593         return;
 594
 595 fail:
 596         log_warning("%s failed to enter waiting state: %s",
 597                     UNIT(p)->id, strerror(-r));
 598         path_enter_dead(p, PATH_FAILURE_RESOURCES);
 599 }
 600
 601 static void path_mkdir(Path *p) {
 602         PathSpec *s;
 603
 604         assert(p);
 605
 606         if (!p->make_directory)
 607                 return;
 608
 609         LIST_FOREACH(spec, s, p->specs)
 610                 path_spec_mkdir(s, p->directory_mode);
 611 }
 612
 613 static int path_start(Unit *u) {
 614         Path *p = PATH(u);
 615
 616         assert(p);
 617         assert(p->state == PATH_DEAD || p->state == PATH_FAILED);
 618
 619         if (UNIT_DEREF(p->unit)->load_state != UNIT_LOADED)
 620                 return -ENOENT;
 621
 622         path_mkdir(p);
 623
 624         p->result = PATH_SUCCESS;
 625         path_enter_waiting(p, true, true);
 626
 627         return 0;
 628 }
 629
 630 static int path_stop(Unit *u) {
 631         Path *p = PATH(u);
 632
 633         assert(p);
 634         assert(p->state == PATH_WAITING || p->state == PATH_RUNNING);
 635
 636         path_enter_dead(p, PATH_SUCCESS);
 637         return 0;
 638 }
 639
 640 static int path_serialize(Unit *u, FILE *f, FDSet *fds) {
 641         Path *p = PATH(u);
 642
 643         assert(u);
 644         assert(f);
 645         assert(fds);
 646
 647         unit_serialize_item(u, f, "state", path_state_to_string(p->state));
 648         unit_serialize_item(u, f, "result", path_result_to_string(p->result));
 649
 650         return 0;
 651 }
 652
 653 static int path_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
 654         Path *p = PATH(u);
 655
 656         assert(u);
 657         assert(key);
 658         assert(value);
 659         assert(fds);
 660
 661         if (streq(key, "state")) {
 662                 PathState state;
 663
 664                 state = path_state_from_string(value);
 665                 if (state < 0)
 666                         log_debug("Failed to parse state value %s", value);
 667                 else
 668                         p->deserialized_state = state;
 669
 670         } else if (streq(key, "result")) {
 671                 PathResult f;
 672
 673                 f = path_result_from_string(value);
 674                 if (f < 0)
 675                         log_debug("Failed to parse result value %s", value);
 676                 else if (f != PATH_SUCCESS)
 677                         p->result = f;
 678
 679         } else
 680                 log_debug("Unknown serialization key '%s'", key);
 681
 682         return 0;
 683 }
 684
 685 static UnitActiveState path_active_state(Unit *u) {
 686         assert(u);
 687
 688         return state_translation_table[PATH(u)->state];
 689 }
 690
 691 static const char *path_sub_state_to_string(Unit *u) {
 692         assert(u);
 693
 694         return path_state_to_string(PATH(u)->state);
 695 }
 696
 697 static void path_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
 698         Path *p = PATH(u);
 699         PathSpec *s;
 700         int changed;
 701
 702         assert(p);
 703         assert(fd >= 0);
 704
 705         if (p->state != PATH_WAITING &&
 706             p->state != PATH_RUNNING)
 707                 return;
 708
 709         /* log_debug("inotify wakeup on %s.", u->id); */
 710
 711         LIST_FOREACH(spec, s, p->specs)
 712                 if (path_spec_owns_inotify_fd(s, fd))
 713                         break;
 714
 715         if (!s) {
 716                 log_error("Got event on unknown fd.");
 717                 goto fail;
 718         }
 719
 720         changed = path_spec_fd_event(s, events);
 721         if (changed < 0)
 722                 goto fail;
 723
 724         /* If we are already running, then remember that one event was
 725          * dispatched so that we restart the service only if something
 726          * actually changed on disk */
 727         p->inotify_triggered = true;
 728
 729         if (changed)
 730                 path_enter_running(p);
 731         else
 732                 path_enter_waiting(p, false, true);
 733
 734         return;
 735
 736 fail:
 737         path_enter_dead(p, PATH_FAILURE_RESOURCES);
 738 }
 739
 740 void path_unit_notify(Unit *u, UnitActiveState new_state) {
 741         Iterator i;
 742         Unit *k;
 743
 744         if (u->type == UNIT_PATH)
 745                 return;
 746
 747         SET_FOREACH(k, u->dependencies[UNIT_TRIGGERED_BY], i) {
 748                 Path *p;
 749
 750                 if (k->type != UNIT_PATH)
 751                         continue;
 752
 753                 if (k->load_state != UNIT_LOADED)
 754                         continue;
 755
 756                 p = PATH(k);
 757
 758                 if (p->state == PATH_RUNNING && new_state == UNIT_INACTIVE) {
 759                         log_debug("%s got notified about unit deactivation.",
 760                                   UNIT(p)->id);
 761
 762                         /* Hmm, so inotify was triggered since the
 763                          * last activation, so I guess we need to
 764                          * recheck what is going on. */
 765                         path_enter_waiting(p, false, p->inotify_triggered);
 766                 }
 767         }
 768 }
 769
 770 static void path_reset_failed(Unit *u) {
 771         Path *p = PATH(u);
 772
 773         assert(p);
 774
 775         if (p->state == PATH_FAILED)
 776                 path_set_state(p, PATH_DEAD);
 777
 778         p->result = PATH_SUCCESS;
 779 }
 780
 781 static const char* const path_state_table[_PATH_STATE_MAX] = {
 782         [PATH_DEAD] = "dead",
 783         [PATH_WAITING] = "waiting",
 784         [PATH_RUNNING] = "running",
 785         [PATH_FAILED] = "failed"
 786 };
 787
 788 DEFINE_STRING_TABLE_LOOKUP(path_state, PathState);
 789
 790 static const char* const path_type_table[_PATH_TYPE_MAX] = {
 791         [PATH_EXISTS] = "PathExists",
 792         [PATH_EXISTS_GLOB] = "PathExistsGlob",
 793         [PATH_CHANGED] = "PathChanged",
 794         [PATH_MODIFIED] = "PathModified",
 795         [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty"
 796 };
 797
 798 DEFINE_STRING_TABLE_LOOKUP(path_type, PathType);
 799
 800 static const char* const path_result_table[_PATH_RESULT_MAX] = {
 801         [PATH_SUCCESS] = "success",
 802         [PATH_FAILURE_RESOURCES] = "resources"
 803 };
 804
 805 DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult);
 806
 807 const UnitVTable path_vtable = {
 808         .object_size = sizeof(Path),
 809         .sections =
 810                 "Unit\0"
 811                 "Path\0"
 812                 "Install\0",
 813
 814         .init = path_init,
 815         .done = path_done,
 816         .load = path_load,
 817
 818         .coldplug = path_coldplug,
 819
 820         .dump = path_dump,
 821
 822         .start = path_start,
 823         .stop = path_stop,
 824
 825         .serialize = path_serialize,
 826         .deserialize_item = path_deserialize_item,
 827
 828         .active_state = path_active_state,
 829         .sub_state_to_string = path_sub_state_to_string,
 830
 831         .fd_event = path_fd_event,
 832
 833         .reset_failed = path_reset_failed,
 834
 835         .bus_interface = "org.freedesktop.systemd1.Path",
 836         .bus_message_handler = bus_path_message_handler,
 837         .bus_invalidating_properties = bus_path_invalidating_properties
 838 };