unit.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   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 <assert.h>
  23 #include <errno.h>
  24 #include <string.h>
  25 #include <sys/epoll.h>
  26 #include <sys/timerfd.h>
  27 #include <sys/poll.h>
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30
  31 #include "set.h"
  32 #include "unit.h"
  33 #include "macro.h"
  34 #include "strv.h"
  35 #include "load-fragment.h"
  36 #include "load-dropin.h"
  37 #include "log.h"
  38
  39 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
  40         [UNIT_SERVICE] = &service_vtable,
  41         [UNIT_TIMER] = &timer_vtable,
  42         [UNIT_SOCKET] = &socket_vtable,
  43         [UNIT_TARGET] = &target_vtable,
  44         [UNIT_DEVICE] = &device_vtable,
  45         [UNIT_MOUNT] = &mount_vtable,
  46         [UNIT_AUTOMOUNT] = &automount_vtable,
  47         [UNIT_SNAPSHOT] = &snapshot_vtable
  48 };
  49
  50 UnitType unit_name_to_type(const char *n) {
  51         UnitType t;
  52
  53         assert(n);
  54
  55         for (t = 0; t < _UNIT_TYPE_MAX; t++)
  56                 if (endswith(n, unit_vtable[t]->suffix))
  57                         return t;
  58
  59         return _UNIT_TYPE_INVALID;
  60 }
  61
  62 #define VALID_CHARS                             \
  63         "0123456789"                            \
  64         "abcdefghijklmnopqrstuvwxyz"            \
  65         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"            \
  66         "-_.\\"
  67
  68 bool unit_name_is_valid(const char *n) {
  69         UnitType t;
  70         const char *e, *i;
  71
  72         assert(n);
  73
  74         if (strlen(n) >= UNIT_NAME_MAX)
  75                 return false;
  76
  77         t = unit_name_to_type(n);
  78         if (t < 0 || t >= _UNIT_TYPE_MAX)
  79                 return false;
  80
  81         if (!(e = strrchr(n, '.')))
  82                 return false;
  83
  84         if (e == n)
  85                 return false;
  86
  87         for (i = n; i < e; i++)
  88                 if (!strchr(VALID_CHARS, *i))
  89                         return false;
  90
  91         return true;
  92 }
  93
  94 char *unit_name_change_suffix(const char *n, const char *suffix) {
  95         char *e, *r;
  96         size_t a, b;
  97
  98         assert(n);
  99         assert(unit_name_is_valid(n));
 100         assert(suffix);
 101
 102         assert_se(e = strrchr(n, '.'));
 103         a = e - n;
 104         b = strlen(suffix);
 105
 106         if (!(r = new(char, a + b + 1)))
 107                 return NULL;
 108
 109         memcpy(r, n, a);
 110         memcpy(r+a, suffix, b+1);
 111
 112         return r;
 113 }
 114
 115 Unit *unit_new(Manager *m) {
 116         Unit *u;
 117
 118         assert(m);
 119
 120         if (!(u = new0(Unit, 1)))
 121                 return NULL;
 122
 123         if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
 124                 free(u);
 125                 return NULL;
 126         }
 127
 128         u->meta.manager = m;
 129         u->meta.type = _UNIT_TYPE_INVALID;
 130
 131         return u;
 132 }
 133
 134 int unit_add_name(Unit *u, const char *text) {
 135         UnitType t;
 136         char *s;
 137         int r;
 138
 139         assert(u);
 140         assert(text);
 141
 142         if (!unit_name_is_valid(text))
 143                 return -EINVAL;
 144
 145         if ((t = unit_name_to_type(text)) == _UNIT_TYPE_INVALID)
 146                 return -EINVAL;
 147
 148         if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type)
 149                 return -EINVAL;
 150
 151         if (!(s = strdup(text)))
 152                 return -ENOMEM;
 153
 154         if ((r = set_put(u->meta.names, s)) < 0) {
 155                 free(s);
 156
 157                 if (r == -EEXIST)
 158                         return 0;
 159
 160                 return r;
 161         }
 162
 163         if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
 164                 set_remove(u->meta.names, s);
 165                 free(s);
 166                 return r;
 167         }
 168
 169         if (u->meta.type == _UNIT_TYPE_INVALID)
 170                 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
 171
 172         u->meta.type = t;
 173
 174         if (!u->meta.id)
 175                 u->meta.id = s;
 176
 177         unit_add_to_dbus_queue(u);
 178         return 0;
 179 }
 180
 181 int unit_choose_id(Unit *u, const char *name) {
 182         char *s;
 183
 184         assert(u);
 185         assert(name);
 186
 187         /* Selects one of the names of this unit as the id */
 188
 189         if (!(s = set_get(u->meta.names, (char*) name)))
 190                 return -ENOENT;
 191
 192         u->meta.id = s;
 193
 194         unit_add_to_dbus_queue(u);
 195         return 0;
 196 }
 197
 198 int unit_set_description(Unit *u, const char *description) {
 199         char *s;
 200
 201         assert(u);
 202
 203         if (!(s = strdup(description)))
 204                 return -ENOMEM;
 205
 206         free(u->meta.description);
 207         u->meta.description = s;
 208
 209         unit_add_to_dbus_queue(u);
 210         return 0;
 211 }
 212
 213 void unit_add_to_load_queue(Unit *u) {
 214         assert(u);
 215
 216         if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
 217                 return;
 218
 219         LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 220         u->meta.in_load_queue = true;
 221 }
 222
 223 void unit_add_to_cleanup_queue(Unit *u) {
 224         assert(u);
 225
 226         if (u->meta.in_cleanup_queue)
 227                 return;
 228
 229         LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 230         u->meta.in_cleanup_queue = true;
 231 }
 232
 233 void unit_add_to_dbus_queue(Unit *u) {
 234         assert(u);
 235
 236         if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue || set_isempty(u->meta.manager->subscribed))
 237                 return;
 238
 239         LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 240         u->meta.in_dbus_queue = true;
 241 }
 242
 243 static void bidi_set_free(Unit *u, Set *s) {
 244         Iterator i;
 245         Unit *other;
 246
 247         assert(u);
 248
 249         /* Frees the set and makes sure we are dropped from the
 250          * inverse pointers */
 251
 252         SET_FOREACH(other, s, i) {
 253                 UnitDependency d;
 254
 255                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 256                         set_remove(other->meta.dependencies[d], u);
 257         }
 258
 259         set_free(s);
 260 }
 261
 262 void unit_free(Unit *u) {
 263         UnitDependency d;
 264         Iterator i;
 265         char *t;
 266
 267         assert(u);
 268
 269         bus_unit_send_removed_signal(u);
 270
 271         /* Detach from next 'bigger' objects */
 272
 273         cgroup_bonding_free_list(u->meta.cgroup_bondings);
 274
 275         SET_FOREACH(t, u->meta.names, i)
 276                 hashmap_remove_value(u->meta.manager->units, t, u);
 277
 278         if (u->meta.type != _UNIT_TYPE_INVALID)
 279                 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
 280
 281         if (u->meta.in_load_queue)
 282                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 283
 284         if (u->meta.in_dbus_queue)
 285                 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 286
 287         if (u->meta.in_cleanup_queue)
 288                 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 289
 290         if (u->meta.load_state != UNIT_STUB)
 291                 if (UNIT_VTABLE(u)->done)
 292                         UNIT_VTABLE(u)->done(u);
 293
 294         /* Free data and next 'smaller' objects */
 295         if (u->meta.job)
 296                 job_free(u->meta.job);
 297
 298         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 299                 bidi_set_free(u, u->meta.dependencies[d]);
 300
 301         free(u->meta.description);
 302         free(u->meta.fragment_path);
 303
 304         while ((t = set_steal_first(u->meta.names)))
 305                 free(t);
 306         set_free(u->meta.names);
 307
 308         free(u);
 309 }
 310
 311 UnitActiveState unit_active_state(Unit *u) {
 312         assert(u);
 313
 314         if (u->meta.load_state != UNIT_LOADED)
 315                 return UNIT_INACTIVE;
 316
 317         return UNIT_VTABLE(u)->active_state(u);
 318 }
 319
 320 static void complete_move(Set **s, Set **other) {
 321         assert(s);
 322         assert(other);
 323
 324         if (!*other)
 325                 return;
 326
 327         if (*s)
 328                 set_move(*s, *other);
 329         else {
 330                 *s = *other;
 331                 *other = NULL;
 332         }
 333 }
 334
 335 static void merge_names(Unit *u, Unit *other) {
 336         char *t;
 337         Iterator i;
 338
 339         assert(u);
 340         assert(other);
 341
 342         complete_move(&u->meta.names, &other->meta.names);
 343
 344         while ((t = set_steal_first(other->meta.names)))
 345                 free(t);
 346
 347         set_free(other->meta.names);
 348         other->meta.names = NULL;
 349         other->meta.id = NULL;
 350
 351         SET_FOREACH(t, u->meta.names, i)
 352                 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
 353 }
 354
 355 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
 356         Iterator i;
 357         Unit *back;
 358         int r;
 359
 360         assert(u);
 361         assert(other);
 362         assert(d < _UNIT_DEPENDENCY_MAX);
 363
 364         SET_FOREACH(back, other->meta.dependencies[d], i) {
 365                 UnitDependency k;
 366
 367                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
 368                         if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
 369
 370                                 if (r == -EEXIST)
 371                                         set_remove(back->meta.dependencies[k], other);
 372                                 else
 373                                         assert(r == -ENOENT);
 374                         }
 375         }
 376
 377         complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
 378
 379         set_free(other->meta.dependencies[d]);
 380         other->meta.dependencies[d] = NULL;
 381 }
 382
 383 int unit_merge(Unit *u, Unit *other) {
 384         UnitDependency d;
 385
 386         assert(u);
 387         assert(other);
 388         assert(u->meta.manager == other->meta.manager);
 389
 390         if (other == u)
 391                 return 0;
 392
 393         /* This merges 'other' into 'unit'. FIXME: This does not
 394          * rollback on failure. */
 395
 396         if (u->meta.type != u->meta.type)
 397                 return -EINVAL;
 398
 399         if (other->meta.load_state != UNIT_STUB)
 400                 return -EEXIST;
 401
 402         /* Merge names */
 403         merge_names(u, other);
 404
 405         /* Merge dependencies */
 406         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 407                 merge_dependencies(u, other, d);
 408
 409         unit_add_to_dbus_queue(u);
 410
 411         other->meta.load_state = UNIT_MERGED;
 412         other->meta.merged_into = u;
 413
 414         unit_add_to_cleanup_queue(other);
 415
 416         return 0;
 417 }
 418
 419 int unit_merge_by_name(Unit *u, const char *name) {
 420         Unit *other;
 421
 422         assert(u);
 423         assert(name);
 424
 425         if (!(other = manager_get_unit(u->meta.manager, name)))
 426                 return unit_add_name(u, name);
 427
 428         return unit_merge(u, other);
 429 }
 430
 431 Unit* unit_follow_merge(Unit *u) {
 432         assert(u);
 433
 434         while (u->meta.load_state == UNIT_MERGED)
 435                 assert_se(u = u->meta.merged_into);
 436
 437         return u;
 438 }
 439
 440 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
 441         int r;
 442
 443         assert(u);
 444         assert(c);
 445
 446         if (c->output != EXEC_OUTPUT_KERNEL && c->output != EXEC_OUTPUT_SYSLOG)
 447                 return 0;
 448
 449         /* If syslog or kernel logging is requested, make sure our own
 450          * logging daemon is run first. */
 451
 452         if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET)) < 0)
 453                 return r;
 454
 455         if (u->meta.manager->running_as != MANAGER_SESSION)
 456                 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET)) < 0)
 457                         return r;
 458
 459         return 0;
 460 }
 461
 462 const char* unit_id(Unit *u) {
 463         assert(u);
 464
 465         if (u->meta.id)
 466                 return u->meta.id;
 467
 468         return set_first(u->meta.names);
 469 }
 470
 471 const char *unit_description(Unit *u) {
 472         assert(u);
 473
 474         if (u->meta.description)
 475                 return u->meta.description;
 476
 477         return unit_id(u);
 478 }
 479
 480 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 481         char *t;
 482         UnitDependency d;
 483         Iterator i;
 484         char *p2;
 485         const char *prefix2;
 486         CGroupBonding *b;
 487
 488         assert(u);
 489
 490         if (!prefix)
 491                 prefix = "";
 492         p2 = strappend(prefix, "\t");
 493         prefix2 = p2 ? p2 : prefix;
 494
 495         fprintf(f,
 496                 "%s→ Unit %s:\n"
 497                 "%s\tDescription: %s\n"
 498                 "%s\tUnit Load State: %s\n"
 499                 "%s\tUnit Active State: %s\n",
 500                 prefix, unit_id(u),
 501                 prefix, unit_description(u),
 502                 prefix, unit_load_state_to_string(u->meta.load_state),
 503                 prefix, unit_active_state_to_string(unit_active_state(u)));
 504
 505         SET_FOREACH(t, u->meta.names, i)
 506                 fprintf(f, "%s\tName: %s\n", prefix, t);
 507
 508         if (u->meta.fragment_path)
 509                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
 510
 511         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 512                 Unit *other;
 513
 514                 if (set_isempty(u->meta.dependencies[d]))
 515                         continue;
 516
 517                 SET_FOREACH(other, u->meta.dependencies[d], i)
 518                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), unit_id(other));
 519         }
 520
 521         fprintf(f,
 522                 "%s\tRecursive Stop: %s\n"
 523                 "%s\tStop When Unneeded: %s\n",
 524                 prefix, yes_no(u->meta.recursive_stop),
 525                 prefix, yes_no(u->meta.stop_when_unneeded));
 526
 527         if (u->meta.load_state == UNIT_LOADED) {
 528                 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
 529                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 530                                 prefix, b->controller, b->path);
 531
 532                 if (UNIT_VTABLE(u)->dump)
 533                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 534         }
 535
 536         if (u->meta.job)
 537                 job_dump(u->meta.job, f, prefix2);
 538
 539         free(p2);
 540 }
 541
 542 /* Common implementation for multiple backends */
 543 int unit_load_fragment_and_dropin(Unit *u, UnitLoadState *new_state) {
 544         int r;
 545
 546         assert(u);
 547         assert(new_state);
 548         assert(*new_state == UNIT_STUB || *new_state == UNIT_LOADED);
 549
 550         /* Load a .service file */
 551         if ((r = unit_load_fragment(u, new_state)) < 0)
 552                 return r;
 553
 554         if (*new_state == UNIT_STUB)
 555                 return -ENOENT;
 556
 557         /* Load drop-in directory data */
 558         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 559                 return r;
 560
 561         return 0;
 562 }
 563
 564 /* Common implementation for multiple backends */
 565 int unit_load_fragment_and_dropin_optional(Unit *u, UnitLoadState *new_state) {
 566         int r;
 567
 568         assert(u);
 569         assert(new_state);
 570         assert(*new_state == UNIT_STUB || *new_state == UNIT_LOADED);
 571
 572         /* Same as unit_load_fragment_and_dropin(), but whether
 573          * something can be loaded or not doesn't matter. */
 574
 575         /* Load a .service file */
 576         if ((r = unit_load_fragment(u, new_state)) < 0)
 577                 return r;
 578
 579         if (*new_state == UNIT_STUB)
 580                 *new_state = UNIT_LOADED;
 581
 582         /* Load drop-in directory data */
 583         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 584                 return r;
 585
 586         return 0;
 587 }
 588
 589 int unit_load(Unit *u) {
 590         int r;
 591         UnitLoadState res;
 592
 593         assert(u);
 594
 595         if (u->meta.in_load_queue) {
 596                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 597                 u->meta.in_load_queue = false;
 598         }
 599
 600         if (u->meta.load_state != UNIT_STUB)
 601                 return 0;
 602
 603         if (UNIT_VTABLE(u)->init) {
 604                 res = UNIT_STUB;
 605                 if ((r = UNIT_VTABLE(u)->init(u, &res)) < 0)
 606                         goto fail;
 607         }
 608
 609         if (res == UNIT_STUB) {
 610                 r = -ENOENT;
 611                 goto fail;
 612         }
 613
 614         u->meta.load_state = res;
 615         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 616
 617         unit_add_to_dbus_queue(unit_follow_merge(u));
 618
 619         return 0;
 620
 621 fail:
 622         u->meta.load_state = UNIT_FAILED;
 623         unit_add_to_dbus_queue(u);
 624
 625         log_error("Failed to load configuration for %s: %s", unit_id(u), strerror(-r));
 626
 627         return r;
 628 }
 629
 630 /* Errors:
 631  *         -EBADR:    This unit type does not support starting.
 632  *         -EALREADY: Unit is already started.
 633  *         -EAGAIN:   An operation is already in progress. Retry later.
 634  */
 635 int unit_start(Unit *u) {
 636         UnitActiveState state;
 637
 638         assert(u);
 639
 640         /* If this is already (being) started, then this will
 641          * succeed. Note that this will even succeed if this unit is
 642          * not startable by the user. This is relied on to detect when
 643          * we need to wait for units and when waiting is finished. */
 644         state = unit_active_state(u);
 645         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 646                 return -EALREADY;
 647
 648         /* If it is stopped, but we cannot start it, then fail */
 649         if (!UNIT_VTABLE(u)->start)
 650                 return -EBADR;
 651
 652         /* We don't suppress calls to ->start() here when we are
 653          * already starting, to allow this request to be used as a
 654          * "hurry up" call, for example when the unit is in some "auto
 655          * restart" state where it waits for a holdoff timer to elapse
 656          * before it will start again. */
 657
 658         unit_add_to_dbus_queue(u);
 659         return UNIT_VTABLE(u)->start(u);
 660 }
 661
 662 bool unit_can_start(Unit *u) {
 663         assert(u);
 664
 665         return !!UNIT_VTABLE(u)->start;
 666 }
 667
 668 /* Errors:
 669  *         -EBADR:    This unit type does not support stopping.
 670  *         -EALREADY: Unit is already stopped.
 671  *         -EAGAIN:   An operation is already in progress. Retry later.
 672  */
 673 int unit_stop(Unit *u) {
 674         UnitActiveState state;
 675
 676         assert(u);
 677
 678         state = unit_active_state(u);
 679         if (state == UNIT_INACTIVE)
 680                 return -EALREADY;
 681
 682         if (!UNIT_VTABLE(u)->stop)
 683                 return -EBADR;
 684
 685         if (state == UNIT_DEACTIVATING)
 686                 return 0;
 687
 688         unit_add_to_dbus_queue(u);
 689         return UNIT_VTABLE(u)->stop(u);
 690 }
 691
 692 /* Errors:
 693  *         -EBADR:    This unit type does not support reloading.
 694  *         -ENOEXEC:  Unit is not started.
 695  *         -EAGAIN:   An operation is already in progress. Retry later.
 696  */
 697 int unit_reload(Unit *u) {
 698         UnitActiveState state;
 699
 700         assert(u);
 701
 702         if (!unit_can_reload(u))
 703                 return -EBADR;
 704
 705         state = unit_active_state(u);
 706         if (unit_active_state(u) == UNIT_ACTIVE_RELOADING)
 707                 return -EALREADY;
 708
 709         if (unit_active_state(u) != UNIT_ACTIVE)
 710                 return -ENOEXEC;
 711
 712         unit_add_to_dbus_queue(u);
 713         return UNIT_VTABLE(u)->reload(u);
 714 }
 715
 716 bool unit_can_reload(Unit *u) {
 717         assert(u);
 718
 719         if (!UNIT_VTABLE(u)->reload)
 720                 return false;
 721
 722         if (!UNIT_VTABLE(u)->can_reload)
 723                 return true;
 724
 725         return UNIT_VTABLE(u)->can_reload(u);
 726 }
 727
 728 static void unit_check_uneeded(Unit *u) {
 729         Iterator i;
 730         Unit *other;
 731
 732         assert(u);
 733
 734         /* If this service shall be shut down when unneeded then do
 735          * so. */
 736
 737         if (!u->meta.stop_when_unneeded)
 738                 return;
 739
 740         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
 741                 return;
 742
 743         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 744                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 745                         return;
 746
 747         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRED_BY], i)
 748                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 749                         return;
 750
 751         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
 752                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 753                         return;
 754
 755         log_debug("Service %s is not needed anymore. Stopping.", unit_id(u));
 756
 757         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
 758         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
 759 }
 760
 761 static void retroactively_start_dependencies(Unit *u) {
 762         Iterator i;
 763         Unit *other;
 764
 765         assert(u);
 766         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
 767
 768         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 769                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 770                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
 771
 772         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRES], i)
 773                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 774                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
 775
 776         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 777                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 778                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
 779
 780         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 781                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 782                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
 783
 784         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
 785                 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
 786                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
 787 }
 788
 789 static void retroactively_stop_dependencies(Unit *u) {
 790         Iterator i;
 791         Unit *other;
 792
 793         assert(u);
 794         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
 795
 796         if (u->meta.recursive_stop) {
 797                 /* Pull down units need us recursively if enabled */
 798                 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
 799                         if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 800                                 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
 801         }
 802
 803         /* Garbage collect services that might not be needed anymore, if enabled */
 804         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
 805                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 806                         unit_check_uneeded(other);
 807         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRES], i)
 808                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 809                         unit_check_uneeded(other);
 810         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
 811                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 812                         unit_check_uneeded(other);
 813         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
 814                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 815                         unit_check_uneeded(other);
 816         SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUISITE], i)
 817                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
 818                         unit_check_uneeded(other);
 819 }
 820
 821 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
 822         assert(u);
 823         assert(os < _UNIT_ACTIVE_STATE_MAX);
 824         assert(ns < _UNIT_ACTIVE_STATE_MAX);
 825         assert(!(os == UNIT_ACTIVE && ns == UNIT_ACTIVATING));
 826         assert(!(os == UNIT_INACTIVE && ns == UNIT_DEACTIVATING));
 827
 828         if (os == ns)
 829                 return;
 830
 831         if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
 832                 u->meta.active_enter_timestamp = now(CLOCK_REALTIME);
 833         else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
 834                 u->meta.active_exit_timestamp = now(CLOCK_REALTIME);
 835
 836         if (u->meta.job) {
 837
 838                 if (u->meta.job->state == JOB_WAITING)
 839
 840                         /* So we reached a different state for this
 841                          * job. Let's see if we can run it now if it
 842                          * failed previously due to EAGAIN. */
 843                         job_add_to_run_queue(u->meta.job);
 844
 845                 else {
 846                         assert(u->meta.job->state == JOB_RUNNING);
 847
 848                         /* Let's check whether this state change
 849                          * constitutes a finished job, or maybe
 850                          * cotradicts a running job and hence needs to
 851                          * invalidate jobs. */
 852
 853                         switch (u->meta.job->type) {
 854
 855                         case JOB_START:
 856                         case JOB_VERIFY_ACTIVE:
 857
 858                                 if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
 859                                         job_finish_and_invalidate(u->meta.job, true);
 860                                         return;
 861                                 } else if (ns == UNIT_ACTIVATING)
 862                                         return;
 863                                 else
 864                                         job_finish_and_invalidate(u->meta.job, false);
 865
 866                                 break;
 867
 868                         case JOB_RELOAD:
 869                         case JOB_RELOAD_OR_START:
 870
 871                                 if (ns == UNIT_ACTIVE) {
 872                                         job_finish_and_invalidate(u->meta.job, true);
 873                                         return;
 874                                 } else if (ns == UNIT_ACTIVATING || ns == UNIT_ACTIVE_RELOADING)
 875                                         return;
 876                                 else
 877                                         job_finish_and_invalidate(u->meta.job, false);
 878
 879                                 break;
 880
 881                         case JOB_STOP:
 882                         case JOB_RESTART:
 883                         case JOB_TRY_RESTART:
 884
 885                                 if (ns == UNIT_INACTIVE) {
 886                                         job_finish_and_invalidate(u->meta.job, true);
 887                                         return;
 888                                 } else if (ns == UNIT_DEACTIVATING)
 889                                         return;
 890                                 else
 891                                         job_finish_and_invalidate(u->meta.job, false);
 892
 893                                 break;
 894
 895                         default:
 896                                 assert_not_reached("Job type unknown");
 897                         }
 898                 }
 899         }
 900
 901         /* If this state change happened without being requested by a
 902          * job, then let's retroactively start or stop dependencies */
 903
 904         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
 905                 retroactively_start_dependencies(u);
 906         else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
 907                 retroactively_stop_dependencies(u);
 908
 909         /* Maybe we finished startup and are now ready for being
 910          * stopped because unneeded? */
 911         unit_check_uneeded(u);
 912
 913         unit_add_to_dbus_queue(u);
 914 }
 915
 916 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
 917         struct epoll_event ev;
 918
 919         assert(u);
 920         assert(fd >= 0);
 921         assert(w);
 922         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
 923
 924         zero(ev);
 925         ev.data.ptr = w;
 926         ev.events = events;
 927
 928         if (epoll_ctl(u->meta.manager->epoll_fd,
 929                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
 930                       fd,
 931                       &ev) < 0)
 932                 return -errno;
 933
 934         w->fd = fd;
 935         w->type = WATCH_FD;
 936         w->data.unit = u;
 937
 938         return 0;
 939 }
 940
 941 void unit_unwatch_fd(Unit *u, Watch *w) {
 942         assert(u);
 943         assert(w);
 944
 945         if (w->type == WATCH_INVALID)
 946                 return;
 947
 948         assert(w->type == WATCH_FD);
 949         assert(w->data.unit == u);
 950         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
 951
 952         w->fd = -1;
 953         w->type = WATCH_INVALID;
 954         w->data.unit = NULL;
 955 }
 956
 957 int unit_watch_pid(Unit *u, pid_t pid) {
 958         assert(u);
 959         assert(pid >= 1);
 960
 961         return hashmap_put(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
 962 }
 963
 964 void unit_unwatch_pid(Unit *u, pid_t pid) {
 965         assert(u);
 966         assert(pid >= 1);
 967
 968         hashmap_remove(u->meta.manager->watch_pids, UINT32_TO_PTR(pid));
 969 }
 970
 971 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
 972         struct itimerspec its;
 973         int flags, fd;
 974         bool ours;
 975
 976         assert(u);
 977         assert(w);
 978         assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
 979
 980         /* This will try to reuse the old timer if there is one */
 981
 982         if (w->type == WATCH_TIMER) {
 983                 ours = false;
 984                 fd = w->fd;
 985         } else {
 986                 ours = true;
 987                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
 988                         return -errno;
 989         }
 990
 991         zero(its);
 992
 993         if (delay <= 0) {
 994                 /* Set absolute time in the past, but not 0, since we
 995                  * don't want to disarm the timer */
 996                 its.it_value.tv_sec = 0;
 997                 its.it_value.tv_nsec = 1;
 998
 999                 flags = TFD_TIMER_ABSTIME;
1000         } else {
1001                 timespec_store(&its.it_value, delay);
1002                 flags = 0;
1003         }
1004
1005         /* This will also flush the elapse counter */
1006         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1007                 goto fail;
1008
1009         if (w->type == WATCH_INVALID) {
1010                 struct epoll_event ev;
1011
1012                 zero(ev);
1013                 ev.data.ptr = w;
1014                 ev.events = EPOLLIN;
1015
1016                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1017                         goto fail;
1018         }
1019
1020         w->fd = fd;
1021         w->type = WATCH_TIMER;
1022         w->data.unit = u;
1023
1024         return 0;
1025
1026 fail:
1027         if (ours)
1028                 close_nointr_nofail(fd);
1029
1030         return -errno;
1031 }
1032
1033 void unit_unwatch_timer(Unit *u, Watch *w) {
1034         assert(u);
1035         assert(w);
1036
1037         if (w->type == WATCH_INVALID)
1038                 return;
1039
1040         assert(w->type == WATCH_TIMER && w->data.unit == u);
1041
1042         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1043         assert_se(close_nointr(w->fd) == 0);
1044
1045         w->fd = -1;
1046         w->type = WATCH_INVALID;
1047         w->data.unit = NULL;
1048 }
1049
1050 bool unit_job_is_applicable(Unit *u, JobType j) {
1051         assert(u);
1052         assert(j >= 0 && j < _JOB_TYPE_MAX);
1053
1054         switch (j) {
1055
1056         case JOB_VERIFY_ACTIVE:
1057         case JOB_START:
1058                 return true;
1059
1060         case JOB_STOP:
1061         case JOB_RESTART:
1062         case JOB_TRY_RESTART:
1063                 return unit_can_start(u);
1064
1065         case JOB_RELOAD:
1066                 return unit_can_reload(u);
1067
1068         case JOB_RELOAD_OR_START:
1069                 return unit_can_reload(u) && unit_can_start(u);
1070
1071         default:
1072                 assert_not_reached("Invalid job type");
1073         }
1074 }
1075
1076 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other) {
1077
1078         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1079                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1080                 [UNIT_SOFT_REQUIRES] = UNIT_SOFT_REQUIRED_BY,
1081                 [UNIT_WANTS] = UNIT_WANTED_BY,
1082                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1083                 [UNIT_SOFT_REQUISITE] = UNIT_SOFT_REQUIRED_BY,
1084                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1085                 [UNIT_SOFT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1086                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1087                 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1088                 [UNIT_BEFORE] = UNIT_AFTER,
1089                 [UNIT_AFTER] = UNIT_BEFORE
1090         };
1091         int r;
1092
1093         assert(u);
1094         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1095         assert(inverse_table[d] != _UNIT_DEPENDENCY_INVALID);
1096         assert(other);
1097
1098         /* We won't allow dependencies on ourselves. We will not
1099          * consider them an error however. */
1100         if (u == other)
1101                 return 0;
1102
1103         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1104                 return r;
1105
1106         if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1107                 return r;
1108
1109         if ((r = set_put(u->meta.dependencies[d], other)) < 0)
1110                 return r;
1111
1112         if ((r = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1113                 set_remove(u->meta.dependencies[d], other);
1114                 return r;
1115         }
1116
1117         unit_add_to_dbus_queue(u);
1118         return 0;
1119 }
1120
1121 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name) {
1122         Unit *other;
1123         int r;
1124
1125         if ((r = manager_load_unit(u->meta.manager, name, &other)) < 0)
1126                 return r;
1127
1128         if ((r = unit_add_dependency(u, d, other)) < 0)
1129                 return r;
1130
1131         return 0;
1132 }
1133
1134 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name) {
1135         Unit *other;
1136         int r;
1137
1138         if ((r = manager_load_unit(u->meta.manager, name, &other)) < 0)
1139                 return r;
1140
1141         if ((r = unit_add_dependency(other, d, u)) < 0)
1142                 return r;
1143
1144         return 0;
1145 }
1146
1147 int set_unit_path(const char *p) {
1148         char *cwd, *c;
1149         int r;
1150
1151         /* This is mostly for debug purposes */
1152
1153         if (path_is_absolute(p)) {
1154                 if (!(c = strdup(p)))
1155                         return -ENOMEM;
1156         } else {
1157                 if (!(cwd = get_current_dir_name()))
1158                         return -errno;
1159
1160                 r = asprintf(&c, "%s/%s", cwd, p);
1161                 free(cwd);
1162
1163                 if (r < 0)
1164                         return -ENOMEM;
1165         }
1166
1167         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1168                 r = -errno;
1169                 free(c);
1170                 return r;
1171         }
1172
1173         return 0;
1174 }
1175
1176 char *unit_name_escape_path(const char *path, const char *suffix) {
1177         char *r, *t;
1178         const char *f;
1179         size_t a, b;
1180
1181         assert(path);
1182
1183         /* Takes a path and a suffix and prefix and makes a nice
1184          * string suitable as unit name of it, escaping all weird
1185          * chars on the way.
1186          *
1187          * / becomes ., and all chars not alloweed in a unit name get
1188          * escaped as \xFF, including \ and ., of course. This
1189          * escaping is hence reversible.
1190          */
1191
1192         if (!suffix)
1193                 suffix = "";
1194
1195         a = strlen(path);
1196         b = strlen(suffix);
1197
1198         if (!(r = new(char, a*4+b+1)))
1199                 return NULL;
1200
1201         for (f = path, t = r; *f; f++) {
1202                 if (*f == '/')
1203                         *(t++) = '.';
1204                 else if (*f == '.' || *f == '\\' || !strchr(VALID_CHARS, *f)) {
1205                         *(t++) = '\\';
1206                         *(t++) = 'x';
1207                         *(t++) = hexchar(*f > 4);
1208                         *(t++) = hexchar(*f);
1209                 } else
1210                         *(t++) = *f;
1211         }
1212
1213         memcpy(t, suffix, b+1);
1214
1215         return r;
1216 }
1217
1218 char *unit_dbus_path(Unit *u) {
1219         char *p, *e;
1220
1221         assert(u);
1222
1223         if (!(e = bus_path_escape(unit_id(u))))
1224                 return NULL;
1225
1226         if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
1227                 free(e);
1228                 return NULL;
1229         }
1230
1231         free(e);
1232         return p;
1233 }
1234
1235 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1236         CGroupBonding *l;
1237         int r;
1238
1239         assert(u);
1240         assert(b);
1241         assert(b->path);
1242
1243         /* Ensure this hasn't been added yet */
1244         assert(!b->unit);
1245
1246         l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1247         LIST_PREPEND(CGroupBonding, by_path, l, b);
1248
1249         if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1250                 LIST_REMOVE(CGroupBonding, by_path, l, b);
1251                 return r;
1252         }
1253
1254         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1255         b->unit = u;
1256
1257         return 0;
1258 }
1259
1260 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1261         size_t n;
1262         const char *p;
1263         char *controller;
1264         CGroupBonding *b;
1265         int r;
1266
1267         assert(u);
1268         assert(name);
1269
1270         /* Detect controller name */
1271         n = strcspn(name, ":/");
1272
1273         /* Only controller name, no path? No path? */
1274         if (name[n] == 0)
1275                 return -EINVAL;
1276
1277         if (n > 0) {
1278                 if (name[n] != ':')
1279                         return -EINVAL;
1280
1281                 p = name+n+1;
1282         } else
1283                 p = name;
1284
1285         /* Insist in absolute paths */
1286         if (p[0] != '/')
1287                 return -EINVAL;
1288
1289         if (!(controller = strndup(name, n)))
1290                 return -ENOMEM;
1291
1292         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1293                 free(controller);
1294                 return -EEXIST;
1295         }
1296
1297         if (!(b = new0(CGroupBonding, 1))) {
1298                 free(controller);
1299                 return -ENOMEM;
1300         }
1301
1302         b->controller = controller;
1303
1304         if (!(b->path = strdup(p))) {
1305                 r = -ENOMEM;
1306                 goto fail;
1307         }
1308
1309         b->only_us = false;
1310         b->clean_up = false;
1311
1312         if ((r = unit_add_cgroup(u, b)) < 0)
1313                 goto fail;
1314
1315         return 0;
1316
1317 fail:
1318         free(b->path);
1319         free(b->controller);
1320         free(b);
1321
1322         return r;
1323 }
1324
1325 int unit_add_default_cgroup(Unit *u) {
1326         CGroupBonding *b;
1327         int r = -ENOMEM;
1328
1329         assert(u);
1330
1331         /* Adds in the default cgroup data, if it wasn't specified yet */
1332
1333         if (unit_get_default_cgroup(u))
1334                 return 0;
1335
1336         if (!(b = new0(CGroupBonding, 1)))
1337                 return -ENOMEM;
1338
1339         if (!(b->controller = strdup(u->meta.manager->cgroup_controller)))
1340                 goto fail;
1341
1342         if (asprintf(&b->path, "%s/%s", u->meta.manager->cgroup_hierarchy, unit_id(u)) < 0)
1343                 goto fail;
1344
1345         b->clean_up = true;
1346         b->only_us = true;
1347
1348         if ((r = unit_add_cgroup(u, b)) < 0)
1349                 goto fail;
1350
1351         return 0;
1352
1353 fail:
1354         free(b->path);
1355         free(b->controller);
1356         free(b);
1357
1358         return r;
1359 }
1360
1361 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1362         assert(u);
1363
1364         return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller);
1365 }
1366
1367 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
1368         [UNIT_SERVICE] = "service",
1369         [UNIT_TIMER] = "timer",
1370         [UNIT_SOCKET] = "socket",
1371         [UNIT_TARGET] = "target",
1372         [UNIT_DEVICE] = "device",
1373         [UNIT_MOUNT] = "mount",
1374         [UNIT_AUTOMOUNT] = "automount",
1375         [UNIT_SNAPSHOT] = "snapshot"
1376 };
1377
1378 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
1379
1380 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
1381         [UNIT_STUB] = "stub",
1382         [UNIT_LOADED] = "loaded",
1383         [UNIT_FAILED] = "failed",
1384         [UNIT_MERGED] = "merged"
1385 };
1386
1387 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
1388
1389 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
1390         [UNIT_ACTIVE] = "active",
1391         [UNIT_INACTIVE] = "inactive",
1392         [UNIT_ACTIVATING] = "activating",
1393         [UNIT_DEACTIVATING] = "deactivating"
1394 };
1395
1396 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
1397
1398 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
1399         [UNIT_REQUIRES] = "Requires",
1400         [UNIT_SOFT_REQUIRES] = "SoftRequires",
1401         [UNIT_WANTS] = "Wants",
1402         [UNIT_REQUISITE] = "Requisite",
1403         [UNIT_SOFT_REQUISITE] = "SoftRequisite",
1404         [UNIT_REQUIRED_BY] = "RequiredBy",
1405         [UNIT_SOFT_REQUIRED_BY] = "SoftRequiredBy",
1406         [UNIT_WANTED_BY] = "WantedBy",
1407         [UNIT_CONFLICTS] = "Conflicts",
1408         [UNIT_BEFORE] = "Before",
1409         [UNIT_AFTER] = "After",
1410 };
1411
1412 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);