src/core/unit.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 <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 #include <sys/stat.h>
  31
  32 #include "set.h"
  33 #include "unit.h"
  34 #include "macro.h"
  35 #include "strv.h"
  36 #include "path-util.h"
  37 #include "load-fragment.h"
  38 #include "load-dropin.h"
  39 #include "log.h"
  40 #include "unit-name.h"
  41 #include "specifier.h"
  42 #include "dbus-unit.h"
  43 #include "special.h"
  44 #include "cgroup-util.h"
  45 #include "missing.h"
  46 #include "cgroup-attr.h"
  47
  48 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
  49         [UNIT_SERVICE] = &service_vtable,
  50         [UNIT_TIMER] = &timer_vtable,
  51         [UNIT_SOCKET] = &socket_vtable,
  52         [UNIT_TARGET] = &target_vtable,
  53         [UNIT_DEVICE] = &device_vtable,
  54         [UNIT_MOUNT] = &mount_vtable,
  55         [UNIT_AUTOMOUNT] = &automount_vtable,
  56         [UNIT_SNAPSHOT] = &snapshot_vtable,
  57         [UNIT_SWAP] = &swap_vtable,
  58         [UNIT_PATH] = &path_vtable
  59 };
  60
  61 Unit *unit_new(Manager *m, size_t size) {
  62         Unit *u;
  63
  64         assert(m);
  65         assert(size >= sizeof(Unit));
  66
  67         u = malloc0(size);
  68         if (!u)
  69                 return NULL;
  70
  71         u->names = set_new(string_hash_func, string_compare_func);
  72         if (!u->names) {
  73                 free(u);
  74                 return NULL;
  75         }
  76
  77         u->manager = m;
  78         u->type = _UNIT_TYPE_INVALID;
  79         u->deserialized_job = _JOB_TYPE_INVALID;
  80         u->default_dependencies = true;
  81         u->unit_file_state = _UNIT_FILE_STATE_INVALID;
  82
  83         return u;
  84 }
  85
  86 bool unit_has_name(Unit *u, const char *name) {
  87         assert(u);
  88         assert(name);
  89
  90         return !!set_get(u->names, (char*) name);
  91 }
  92
  93 int unit_add_name(Unit *u, const char *text) {
  94         UnitType t;
  95         char *s, *i = NULL;
  96         int r;
  97
  98         assert(u);
  99         assert(text);
 100
 101         if (unit_name_is_template(text)) {
 102                 if (!u->instance)
 103                         return -EINVAL;
 104
 105                 s = unit_name_replace_instance(text, u->instance);
 106         } else
 107                 s = strdup(text);
 108
 109         if (!s)
 110                 return -ENOMEM;
 111
 112         if (!unit_name_is_valid(s, false)) {
 113                 r = -EINVAL;
 114                 goto fail;
 115         }
 116
 117         assert_se((t = unit_name_to_type(s)) >= 0);
 118
 119         if (u->type != _UNIT_TYPE_INVALID && t != u->type) {
 120                 r = -EINVAL;
 121                 goto fail;
 122         }
 123
 124         if ((r = unit_name_to_instance(s, &i)) < 0)
 125                 goto fail;
 126
 127         if (i && unit_vtable[t]->no_instances) {
 128                 r = -EINVAL;
 129                 goto fail;
 130         }
 131
 132         /* Ensure that this unit is either instanced or not instanced,
 133          * but not both. */
 134         if (u->type != _UNIT_TYPE_INVALID && !u->instance != !i) {
 135                 r = -EINVAL;
 136                 goto fail;
 137         }
 138
 139         if (unit_vtable[t]->no_alias &&
 140             !set_isempty(u->names) &&
 141             !set_get(u->names, s)) {
 142                 r = -EEXIST;
 143                 goto fail;
 144         }
 145
 146         if (hashmap_size(u->manager->units) >= MANAGER_MAX_NAMES) {
 147                 r = -E2BIG;
 148                 goto fail;
 149         }
 150
 151         if ((r = set_put(u->names, s)) < 0) {
 152                 if (r == -EEXIST)
 153                         r = 0;
 154                 goto fail;
 155         }
 156
 157         if ((r = hashmap_put(u->manager->units, s, u)) < 0) {
 158                 set_remove(u->names, s);
 159                 goto fail;
 160         }
 161
 162         if (u->type == _UNIT_TYPE_INVALID) {
 163
 164                 u->type = t;
 165                 u->id = s;
 166                 u->instance = i;
 167
 168                 LIST_PREPEND(Unit, units_by_type, u->manager->units_by_type[t], u);
 169
 170                 if (UNIT_VTABLE(u)->init)
 171                         UNIT_VTABLE(u)->init(u);
 172         } else
 173                 free(i);
 174
 175         unit_add_to_dbus_queue(u);
 176         return 0;
 177
 178 fail:
 179         free(s);
 180         free(i);
 181
 182         return r;
 183 }
 184
 185 int unit_choose_id(Unit *u, const char *name) {
 186         char *s, *t = NULL, *i;
 187         int r;
 188
 189         assert(u);
 190         assert(name);
 191
 192         if (unit_name_is_template(name)) {
 193
 194                 if (!u->instance)
 195                         return -EINVAL;
 196
 197                 if (!(t = unit_name_replace_instance(name, u->instance)))
 198                         return -ENOMEM;
 199
 200                 name = t;
 201         }
 202
 203         /* Selects one of the names of this unit as the id */
 204         s = set_get(u->names, (char*) name);
 205         free(t);
 206
 207         if (!s)
 208                 return -ENOENT;
 209
 210         if ((r = unit_name_to_instance(s, &i)) < 0)
 211                 return r;
 212
 213         u->id = s;
 214
 215         free(u->instance);
 216         u->instance = i;
 217
 218         unit_add_to_dbus_queue(u);
 219
 220         return 0;
 221 }
 222
 223 int unit_set_description(Unit *u, const char *description) {
 224         char *s;
 225
 226         assert(u);
 227
 228         if (!(s = strdup(description)))
 229                 return -ENOMEM;
 230
 231         free(u->description);
 232         u->description = s;
 233
 234         unit_add_to_dbus_queue(u);
 235         return 0;
 236 }
 237
 238 bool unit_check_gc(Unit *u) {
 239         assert(u);
 240
 241         if (u->load_state == UNIT_STUB)
 242                 return true;
 243
 244         if (UNIT_VTABLE(u)->no_gc)
 245                 return true;
 246
 247         if (u->no_gc)
 248                 return true;
 249
 250         if (u->job)
 251                 return true;
 252
 253         if (u->nop_job)
 254                 return true;
 255
 256         if (unit_active_state(u) != UNIT_INACTIVE)
 257                 return true;
 258
 259         if (UNIT_VTABLE(u)->check_gc)
 260                 if (UNIT_VTABLE(u)->check_gc(u))
 261                         return true;
 262
 263         return false;
 264 }
 265
 266 void unit_add_to_load_queue(Unit *u) {
 267         assert(u);
 268         assert(u->type != _UNIT_TYPE_INVALID);
 269
 270         if (u->load_state != UNIT_STUB || u->in_load_queue)
 271                 return;
 272
 273         LIST_PREPEND(Unit, load_queue, u->manager->load_queue, u);
 274         u->in_load_queue = true;
 275 }
 276
 277 void unit_add_to_cleanup_queue(Unit *u) {
 278         assert(u);
 279
 280         if (u->in_cleanup_queue)
 281                 return;
 282
 283         LIST_PREPEND(Unit, cleanup_queue, u->manager->cleanup_queue, u);
 284         u->in_cleanup_queue = true;
 285 }
 286
 287 void unit_add_to_gc_queue(Unit *u) {
 288         assert(u);
 289
 290         if (u->in_gc_queue || u->in_cleanup_queue)
 291                 return;
 292
 293         if (unit_check_gc(u))
 294                 return;
 295
 296         LIST_PREPEND(Unit, gc_queue, u->manager->gc_queue, u);
 297         u->in_gc_queue = true;
 298
 299         u->manager->n_in_gc_queue ++;
 300
 301         if (u->manager->gc_queue_timestamp <= 0)
 302                 u->manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
 303 }
 304
 305 void unit_add_to_dbus_queue(Unit *u) {
 306         assert(u);
 307         assert(u->type != _UNIT_TYPE_INVALID);
 308
 309         if (u->load_state == UNIT_STUB || u->in_dbus_queue)
 310                 return;
 311
 312         /* Shortcut things if nobody cares */
 313         if (!bus_has_subscriber(u->manager)) {
 314                 u->sent_dbus_new_signal = true;
 315                 return;
 316         }
 317
 318         LIST_PREPEND(Unit, dbus_queue, u->manager->dbus_unit_queue, u);
 319         u->in_dbus_queue = true;
 320 }
 321
 322 static void bidi_set_free(Unit *u, Set *s) {
 323         Iterator i;
 324         Unit *other;
 325
 326         assert(u);
 327
 328         /* Frees the set and makes sure we are dropped from the
 329          * inverse pointers */
 330
 331         SET_FOREACH(other, s, i) {
 332                 UnitDependency d;
 333
 334                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 335                         set_remove(other->dependencies[d], u);
 336
 337                 unit_add_to_gc_queue(other);
 338         }
 339
 340         set_free(s);
 341 }
 342
 343 void unit_free(Unit *u) {
 344         UnitDependency d;
 345         Iterator i;
 346         char *t;
 347
 348         assert(u);
 349
 350         bus_unit_send_removed_signal(u);
 351
 352         if (u->load_state != UNIT_STUB)
 353                 if (UNIT_VTABLE(u)->done)
 354                         UNIT_VTABLE(u)->done(u);
 355
 356         SET_FOREACH(t, u->names, i)
 357                 hashmap_remove_value(u->manager->units, t, u);
 358
 359         if (u->job) {
 360                 Job *j = u->job;
 361                 job_uninstall(j);
 362                 job_free(j);
 363         }
 364
 365         if (u->nop_job) {
 366                 Job *j = u->nop_job;
 367                 job_uninstall(j);
 368                 job_free(j);
 369         }
 370
 371         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 372                 bidi_set_free(u, u->dependencies[d]);
 373
 374         if (u->requires_mounts_for) {
 375                 LIST_REMOVE(Unit, has_requires_mounts_for, u->manager->has_requires_mounts_for, u);
 376                 strv_free(u->requires_mounts_for);
 377         }
 378
 379         if (u->type != _UNIT_TYPE_INVALID)
 380                 LIST_REMOVE(Unit, units_by_type, u->manager->units_by_type[u->type], u);
 381
 382         if (u->in_load_queue)
 383                 LIST_REMOVE(Unit, load_queue, u->manager->load_queue, u);
 384
 385         if (u->in_dbus_queue)
 386                 LIST_REMOVE(Unit, dbus_queue, u->manager->dbus_unit_queue, u);
 387
 388         if (u->in_cleanup_queue)
 389                 LIST_REMOVE(Unit, cleanup_queue, u->manager->cleanup_queue, u);
 390
 391         if (u->in_gc_queue) {
 392                 LIST_REMOVE(Unit, gc_queue, u->manager->gc_queue, u);
 393                 u->manager->n_in_gc_queue--;
 394         }
 395
 396         cgroup_bonding_free_list(u->cgroup_bondings, u->manager->n_reloading <= 0);
 397         cgroup_attribute_free_list(u->cgroup_attributes);
 398
 399         free(u->description);
 400         strv_free(u->documentation);
 401         free(u->fragment_path);
 402         free(u->source_path);
 403         free(u->instance);
 404
 405         set_free_free(u->names);
 406
 407         condition_free_list(u->conditions);
 408
 409         while (u->refs)
 410                 unit_ref_unset(u->refs);
 411
 412         free(u);
 413 }
 414
 415 UnitActiveState unit_active_state(Unit *u) {
 416         assert(u);
 417
 418         if (u->load_state == UNIT_MERGED)
 419                 return unit_active_state(unit_follow_merge(u));
 420
 421         /* After a reload it might happen that a unit is not correctly
 422          * loaded but still has a process around. That's why we won't
 423          * shortcut failed loading to UNIT_INACTIVE_FAILED. */
 424
 425         return UNIT_VTABLE(u)->active_state(u);
 426 }
 427
 428 const char* unit_sub_state_to_string(Unit *u) {
 429         assert(u);
 430
 431         return UNIT_VTABLE(u)->sub_state_to_string(u);
 432 }
 433
 434 static void complete_move(Set **s, Set **other) {
 435         assert(s);
 436         assert(other);
 437
 438         if (!*other)
 439                 return;
 440
 441         if (*s)
 442                 set_move(*s, *other);
 443         else {
 444                 *s = *other;
 445                 *other = NULL;
 446         }
 447 }
 448
 449 static void merge_names(Unit *u, Unit *other) {
 450         char *t;
 451         Iterator i;
 452
 453         assert(u);
 454         assert(other);
 455
 456         complete_move(&u->names, &other->names);
 457
 458         set_free_free(other->names);
 459         other->names = NULL;
 460         other->id = NULL;
 461
 462         SET_FOREACH(t, u->names, i)
 463                 assert_se(hashmap_replace(u->manager->units, t, u) == 0);
 464 }
 465
 466 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
 467         Iterator i;
 468         Unit *back;
 469         int r;
 470
 471         assert(u);
 472         assert(other);
 473         assert(d < _UNIT_DEPENDENCY_MAX);
 474
 475         /* Fix backwards pointers */
 476         SET_FOREACH(back, other->dependencies[d], i) {
 477                 UnitDependency k;
 478
 479                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
 480                         if ((r = set_remove_and_put(back->dependencies[k], other, u)) < 0) {
 481
 482                                 if (r == -EEXIST)
 483                                         set_remove(back->dependencies[k], other);
 484                                 else
 485                                         assert(r == -ENOENT);
 486                         }
 487         }
 488
 489         complete_move(&u->dependencies[d], &other->dependencies[d]);
 490
 491         set_free(other->dependencies[d]);
 492         other->dependencies[d] = NULL;
 493 }
 494
 495 int unit_merge(Unit *u, Unit *other) {
 496         UnitDependency d;
 497
 498         assert(u);
 499         assert(other);
 500         assert(u->manager == other->manager);
 501         assert(u->type != _UNIT_TYPE_INVALID);
 502
 503         other = unit_follow_merge(other);
 504
 505         if (other == u)
 506                 return 0;
 507
 508         if (u->type != other->type)
 509                 return -EINVAL;
 510
 511         if (!u->instance != !other->instance)
 512                 return -EINVAL;
 513
 514         if (other->load_state != UNIT_STUB &&
 515             other->load_state != UNIT_ERROR)
 516                 return -EEXIST;
 517
 518         if (other->job)
 519                 return -EEXIST;
 520
 521         if (other->nop_job)
 522                 return -EEXIST;
 523
 524         if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
 525                 return -EEXIST;
 526
 527         /* Merge names */
 528         merge_names(u, other);
 529
 530         /* Redirect all references */
 531         while (other->refs)
 532                 unit_ref_set(other->refs, u);
 533
 534         /* Merge dependencies */
 535         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 536                 merge_dependencies(u, other, d);
 537
 538         other->load_state = UNIT_MERGED;
 539         other->merged_into = u;
 540
 541         /* If there is still some data attached to the other node, we
 542          * don't need it anymore, and can free it. */
 543         if (other->load_state != UNIT_STUB)
 544                 if (UNIT_VTABLE(other)->done)
 545                         UNIT_VTABLE(other)->done(other);
 546
 547         unit_add_to_dbus_queue(u);
 548         unit_add_to_cleanup_queue(other);
 549
 550         return 0;
 551 }
 552
 553 int unit_merge_by_name(Unit *u, const char *name) {
 554         Unit *other;
 555         int r;
 556         char *s = NULL;
 557
 558         assert(u);
 559         assert(name);
 560
 561         if (unit_name_is_template(name)) {
 562                 if (!u->instance)
 563                         return -EINVAL;
 564
 565                 if (!(s = unit_name_replace_instance(name, u->instance)))
 566                         return -ENOMEM;
 567
 568                 name = s;
 569         }
 570
 571         if (!(other = manager_get_unit(u->manager, name)))
 572                 r = unit_add_name(u, name);
 573         else
 574                 r = unit_merge(u, other);
 575
 576         free(s);
 577         return r;
 578 }
 579
 580 Unit* unit_follow_merge(Unit *u) {
 581         assert(u);
 582
 583         while (u->load_state == UNIT_MERGED)
 584                 assert_se(u = u->merged_into);
 585
 586         return u;
 587 }
 588
 589 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
 590         int r;
 591
 592         assert(u);
 593         assert(c);
 594
 595         if (c->std_output != EXEC_OUTPUT_KMSG &&
 596             c->std_output != EXEC_OUTPUT_SYSLOG &&
 597             c->std_output != EXEC_OUTPUT_JOURNAL &&
 598             c->std_output != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
 599             c->std_output != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
 600             c->std_output != EXEC_OUTPUT_JOURNAL_AND_CONSOLE &&
 601             c->std_error != EXEC_OUTPUT_KMSG &&
 602             c->std_error != EXEC_OUTPUT_SYSLOG &&
 603             c->std_error != EXEC_OUTPUT_JOURNAL &&
 604             c->std_error != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
 605             c->std_error != EXEC_OUTPUT_JOURNAL_AND_CONSOLE &&
 606             c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE)
 607                 return 0;
 608
 609         /* If syslog or kernel logging is requested, make sure our own
 610          * logging daemon is run first. */
 611
 612         if (u->manager->running_as == MANAGER_SYSTEM)
 613                 if ((r = unit_add_two_dependencies_by_name(u, UNIT_REQUIRES, UNIT_AFTER, SPECIAL_JOURNALD_SOCKET, NULL, true)) < 0)
 614                         return r;
 615
 616         return 0;
 617 }
 618
 619 const char *unit_description(Unit *u) {
 620         assert(u);
 621
 622         if (u->description)
 623                 return u->description;
 624
 625         return strna(u->id);
 626 }
 627
 628 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 629         char *t, **j;
 630         UnitDependency d;
 631         Iterator i;
 632         char *p2;
 633         const char *prefix2;
 634         char
 635                 timestamp1[FORMAT_TIMESTAMP_MAX],
 636                 timestamp2[FORMAT_TIMESTAMP_MAX],
 637                 timestamp3[FORMAT_TIMESTAMP_MAX],
 638                 timestamp4[FORMAT_TIMESTAMP_MAX],
 639                 timespan[FORMAT_TIMESPAN_MAX];
 640         Unit *following;
 641
 642         assert(u);
 643         assert(u->type >= 0);
 644
 645         if (!prefix)
 646                 prefix = "";
 647         p2 = strappend(prefix, "\t");
 648         prefix2 = p2 ? p2 : prefix;
 649
 650         fprintf(f,
 651                 "%s-> Unit %s:\n"
 652                 "%s\tDescription: %s\n"
 653                 "%s\tInstance: %s\n"
 654                 "%s\tUnit Load State: %s\n"
 655                 "%s\tUnit Active State: %s\n"
 656                 "%s\tInactive Exit Timestamp: %s\n"
 657                 "%s\tActive Enter Timestamp: %s\n"
 658                 "%s\tActive Exit Timestamp: %s\n"
 659                 "%s\tInactive Enter Timestamp: %s\n"
 660                 "%s\tGC Check Good: %s\n"
 661                 "%s\tNeed Daemon Reload: %s\n",
 662                 prefix, u->id,
 663                 prefix, unit_description(u),
 664                 prefix, strna(u->instance),
 665                 prefix, unit_load_state_to_string(u->load_state),
 666                 prefix, unit_active_state_to_string(unit_active_state(u)),
 667                 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->inactive_exit_timestamp.realtime)),
 668                 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->active_enter_timestamp.realtime)),
 669                 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->active_exit_timestamp.realtime)),
 670                 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->inactive_enter_timestamp.realtime)),
 671                 prefix, yes_no(unit_check_gc(u)),
 672                 prefix, yes_no(unit_need_daemon_reload(u)));
 673
 674         SET_FOREACH(t, u->names, i)
 675                 fprintf(f, "%s\tName: %s\n", prefix, t);
 676
 677         STRV_FOREACH(j, u->documentation)
 678                 fprintf(f, "%s\tDocumentation: %s\n", prefix, *j);
 679
 680         if ((following = unit_following(u)))
 681                 fprintf(f, "%s\tFollowing: %s\n", prefix, following->id);
 682
 683         if (u->fragment_path)
 684                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->fragment_path);
 685
 686         if (u->source_path)
 687                 fprintf(f, "%s\tSource Path: %s\n", prefix, u->source_path);
 688
 689         if (u->job_timeout > 0)
 690                 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->job_timeout));
 691
 692         condition_dump_list(u->conditions, f, prefix);
 693
 694         if (dual_timestamp_is_set(&u->condition_timestamp))
 695                 fprintf(f,
 696                         "%s\tCondition Timestamp: %s\n"
 697                         "%s\tCondition Result: %s\n",
 698                         prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->condition_timestamp.realtime)),
 699                         prefix, yes_no(u->condition_result));
 700
 701         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 702                 Unit *other;
 703
 704                 SET_FOREACH(other, u->dependencies[d], i)
 705                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->id);
 706         }
 707
 708         if (!strv_isempty(u->requires_mounts_for)) {
 709                 fprintf(f,
 710                         "%s\tRequiresMountsFor:", prefix);
 711
 712                 STRV_FOREACH(j, u->requires_mounts_for)
 713                         fprintf(f, " %s", *j);
 714
 715                 fputs("\n", f);
 716         }
 717
 718         if (u->load_state == UNIT_LOADED) {
 719                 CGroupBonding *b;
 720                 CGroupAttribute *a;
 721
 722                 fprintf(f,
 723                         "%s\tStopWhenUnneeded: %s\n"
 724                         "%s\tRefuseManualStart: %s\n"
 725                         "%s\tRefuseManualStop: %s\n"
 726                         "%s\tDefaultDependencies: %s\n"
 727                         "%s\tOnFailureIsolate: %s\n"
 728                         "%s\tIgnoreOnIsolate: %s\n"
 729                         "%s\tIgnoreOnSnapshot: %s\n",
 730                         prefix, yes_no(u->stop_when_unneeded),
 731                         prefix, yes_no(u->refuse_manual_start),
 732                         prefix, yes_no(u->refuse_manual_stop),
 733                         prefix, yes_no(u->default_dependencies),
 734                         prefix, yes_no(u->on_failure_isolate),
 735                         prefix, yes_no(u->ignore_on_isolate),
 736                         prefix, yes_no(u->ignore_on_snapshot));
 737
 738                 LIST_FOREACH(by_unit, b, u->cgroup_bondings)
 739                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 740                                 prefix, b->controller, b->path);
 741
 742                 LIST_FOREACH(by_unit, a, u->cgroup_attributes) {
 743                         char *v = NULL;
 744
 745                         if (a->map_callback)
 746                                 a->map_callback(a->controller, a->name, a->value, &v);
 747
 748                         fprintf(f, "%s\tControlGroupAttribute: %s %s \"%s\"\n",
 749                                 prefix, a->controller, a->name, v ? v : a->value);
 750
 751                         free(v);
 752                 }
 753
 754                 if (UNIT_VTABLE(u)->dump)
 755                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 756
 757         } else if (u->load_state == UNIT_MERGED)
 758                 fprintf(f,
 759                         "%s\tMerged into: %s\n",
 760                         prefix, u->merged_into->id);
 761         else if (u->load_state == UNIT_ERROR)
 762                 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->load_error));
 763
 764
 765         if (u->job)
 766                 job_dump(u->job, f, prefix2);
 767
 768         if (u->nop_job)
 769                 job_dump(u->nop_job, f, prefix2);
 770
 771         free(p2);
 772 }
 773
 774 /* Common implementation for multiple backends */
 775 int unit_load_fragment_and_dropin(Unit *u) {
 776         int r;
 777
 778         assert(u);
 779
 780         /* Load a .service file */
 781         if ((r = unit_load_fragment(u)) < 0)
 782                 return r;
 783
 784         if (u->load_state == UNIT_STUB)
 785                 return -ENOENT;
 786
 787         /* Load drop-in directory data */
 788         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 789                 return r;
 790
 791         return 0;
 792 }
 793
 794 /* Common implementation for multiple backends */
 795 int unit_load_fragment_and_dropin_optional(Unit *u) {
 796         int r;
 797
 798         assert(u);
 799
 800         /* Same as unit_load_fragment_and_dropin(), but whether
 801          * something can be loaded or not doesn't matter. */
 802
 803         /* Load a .service file */
 804         if ((r = unit_load_fragment(u)) < 0)
 805                 return r;
 806
 807         if (u->load_state == UNIT_STUB)
 808                 u->load_state = UNIT_LOADED;
 809
 810         /* Load drop-in directory data */
 811         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 812                 return r;
 813
 814         return 0;
 815 }
 816
 817 int unit_add_default_target_dependency(Unit *u, Unit *target) {
 818         assert(u);
 819         assert(target);
 820
 821         if (target->type != UNIT_TARGET)
 822                 return 0;
 823
 824         /* Only add the dependency if both units are loaded, so that
 825          * that loop check below is reliable */
 826         if (u->load_state != UNIT_LOADED ||
 827             target->load_state != UNIT_LOADED)
 828                 return 0;
 829
 830         /* If either side wants no automatic dependencies, then let's
 831          * skip this */
 832         if (!u->default_dependencies ||
 833             !target->default_dependencies)
 834                 return 0;
 835
 836         /* Don't create loops */
 837         if (set_get(target->dependencies[UNIT_BEFORE], u))
 838                 return 0;
 839
 840         return unit_add_dependency(target, UNIT_AFTER, u, true);
 841 }
 842
 843 static int unit_add_default_dependencies(Unit *u) {
 844         static const UnitDependency deps[] = {
 845                 UNIT_REQUIRED_BY,
 846                 UNIT_REQUIRED_BY_OVERRIDABLE,
 847                 UNIT_WANTED_BY,
 848                 UNIT_BOUND_BY
 849         };
 850
 851         Unit *target;
 852         Iterator i;
 853         int r;
 854         unsigned k;
 855
 856         assert(u);
 857
 858         for (k = 0; k < ELEMENTSOF(deps); k++)
 859                 SET_FOREACH(target, u->dependencies[deps[k]], i)
 860                         if ((r = unit_add_default_target_dependency(u, target)) < 0)
 861                                 return r;
 862
 863         return 0;
 864 }
 865
 866 int unit_load(Unit *u) {
 867         int r;
 868
 869         assert(u);
 870
 871         if (u->in_load_queue) {
 872                 LIST_REMOVE(Unit, load_queue, u->manager->load_queue, u);
 873                 u->in_load_queue = false;
 874         }
 875
 876         if (u->type == _UNIT_TYPE_INVALID)
 877                 return -EINVAL;
 878
 879         if (u->load_state != UNIT_STUB)
 880                 return 0;
 881
 882         if (UNIT_VTABLE(u)->load)
 883                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 884                         goto fail;
 885
 886         if (u->load_state == UNIT_STUB) {
 887                 r = -ENOENT;
 888                 goto fail;
 889         }
 890
 891         if (u->load_state == UNIT_LOADED &&
 892             u->default_dependencies)
 893                 if ((r = unit_add_default_dependencies(u)) < 0)
 894                         goto fail;
 895
 896         if (u->load_state == UNIT_LOADED) {
 897                 r = unit_add_mount_links(u);
 898                 if (r < 0)
 899                         return r;
 900         }
 901
 902         if (u->on_failure_isolate &&
 903             set_size(u->dependencies[UNIT_ON_FAILURE]) > 1) {
 904
 905                 log_error("More than one OnFailure= dependencies specified for %s but OnFailureIsolate= enabled. Refusing.",
 906                           u->id);
 907
 908                 r = -EINVAL;
 909                 goto fail;
 910         }
 911
 912         assert((u->load_state != UNIT_MERGED) == !u->merged_into);
 913
 914         unit_add_to_dbus_queue(unit_follow_merge(u));
 915         unit_add_to_gc_queue(u);
 916
 917         return 0;
 918
 919 fail:
 920         u->load_state = UNIT_ERROR;
 921         u->load_error = r;
 922         unit_add_to_dbus_queue(u);
 923         unit_add_to_gc_queue(u);
 924
 925         log_debug("Failed to load configuration for %s: %s", u->id, strerror(-r));
 926
 927         return r;
 928 }
 929
 930 bool unit_condition_test(Unit *u) {
 931         assert(u);
 932
 933         dual_timestamp_get(&u->condition_timestamp);
 934         u->condition_result = condition_test_list(u->conditions);
 935
 936         return u->condition_result;
 937 }
 938
 939 static void unit_status_print_starting_stopping(Unit *u, bool stopping) {
 940         const UnitStatusMessageFormats *format_table;
 941         const char *format;
 942
 943         format_table = &UNIT_VTABLE(u)->status_message_formats;
 944         if (!format_table)
 945                 return;
 946
 947         format = format_table->starting_stopping[stopping];
 948         if (!format)
 949                 return;
 950
 951         unit_status_printf(u, "", format, unit_description(u));
 952 }
 953
 954 /* Errors:
 955  *         -EBADR:     This unit type does not support starting.
 956  *         -EALREADY:  Unit is already started.
 957  *         -EAGAIN:    An operation is already in progress. Retry later.
 958  *         -ECANCELED: Too many requests for now.
 959  */
 960 int unit_start(Unit *u) {
 961         UnitActiveState state;
 962         Unit *following;
 963
 964         assert(u);
 965
 966         if (u->load_state != UNIT_LOADED)
 967                 return -EINVAL;
 968
 969         /* If this is already started, then this will succeed. Note
 970          * that this will even succeed if this unit is not startable
 971          * by the user. This is relied on to detect when we need to
 972          * wait for units and when waiting is finished. */
 973         state = unit_active_state(u);
 974         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 975                 return -EALREADY;
 976
 977         /* If the conditions failed, don't do anything at all. If we
 978          * already are activating this call might still be useful to
 979          * speed up activation in case there is some hold-off time,
 980          * but we don't want to recheck the condition in that case. */
 981         if (state != UNIT_ACTIVATING &&
 982             !unit_condition_test(u)) {
 983                 log_debug("Starting of %s requested but condition failed. Ignoring.", u->id);
 984                 return -EALREADY;
 985         }
 986
 987         /* Forward to the main object, if we aren't it. */
 988         if ((following = unit_following(u))) {
 989                 log_debug("Redirecting start request from %s to %s.", u->id, following->id);
 990                 return unit_start(following);
 991         }
 992
 993         unit_status_print_starting_stopping(u, false);
 994
 995         /* If it is stopped, but we cannot start it, then fail */
 996         if (!UNIT_VTABLE(u)->start)
 997                 return -EBADR;
 998
 999         /* We don't suppress calls to ->start() here when we are
1000          * already starting, to allow this request to be used as a
1001          * "hurry up" call, for example when the unit is in some "auto
1002          * restart" state where it waits for a holdoff timer to elapse
1003          * before it will start again. */
1004
1005         unit_add_to_dbus_queue(u);
1006
1007         return UNIT_VTABLE(u)->start(u);
1008 }
1009
1010 bool unit_can_start(Unit *u) {
1011         assert(u);
1012
1013         return !!UNIT_VTABLE(u)->start;
1014 }
1015
1016 bool unit_can_isolate(Unit *u) {
1017         assert(u);
1018
1019         return unit_can_start(u) &&
1020                 u->allow_isolate;
1021 }
1022
1023 /* Errors:
1024  *         -EBADR:    This unit type does not support stopping.
1025  *         -EALREADY: Unit is already stopped.
1026  *         -EAGAIN:   An operation is already in progress. Retry later.
1027  */
1028 int unit_stop(Unit *u) {
1029         UnitActiveState state;
1030         Unit *following;
1031
1032         assert(u);
1033
1034         state = unit_active_state(u);
1035         if (UNIT_IS_INACTIVE_OR_FAILED(state))
1036                 return -EALREADY;
1037
1038         if ((following = unit_following(u))) {
1039                 log_debug("Redirecting stop request from %s to %s.", u->id, following->id);
1040                 return unit_stop(following);
1041         }
1042
1043         unit_status_print_starting_stopping(u, true);
1044
1045         if (!UNIT_VTABLE(u)->stop)
1046                 return -EBADR;
1047
1048         unit_add_to_dbus_queue(u);
1049
1050         return UNIT_VTABLE(u)->stop(u);
1051 }
1052
1053 /* Errors:
1054  *         -EBADR:    This unit type does not support reloading.
1055  *         -ENOEXEC:  Unit is not started.
1056  *         -EAGAIN:   An operation is already in progress. Retry later.
1057  */
1058 int unit_reload(Unit *u) {
1059         UnitActiveState state;
1060         Unit *following;
1061
1062         assert(u);
1063
1064         if (u->load_state != UNIT_LOADED)
1065                 return -EINVAL;
1066
1067         if (!unit_can_reload(u))
1068                 return -EBADR;
1069
1070         state = unit_active_state(u);
1071         if (state == UNIT_RELOADING)
1072                 return -EALREADY;
1073
1074         if (state != UNIT_ACTIVE)
1075                 return -ENOEXEC;
1076
1077         if ((following = unit_following(u))) {
1078                 log_debug("Redirecting reload request from %s to %s.", u->id, following->id);
1079                 return unit_reload(following);
1080         }
1081
1082         unit_add_to_dbus_queue(u);
1083         return UNIT_VTABLE(u)->reload(u);
1084 }
1085
1086 bool unit_can_reload(Unit *u) {
1087         assert(u);
1088
1089         if (!UNIT_VTABLE(u)->reload)
1090                 return false;
1091
1092         if (!UNIT_VTABLE(u)->can_reload)
1093                 return true;
1094
1095         return UNIT_VTABLE(u)->can_reload(u);
1096 }
1097
1098 static void unit_check_unneeded(Unit *u) {
1099         Iterator i;
1100         Unit *other;
1101
1102         assert(u);
1103
1104         /* If this service shall be shut down when unneeded then do
1105          * so. */
1106
1107         if (!u->stop_when_unneeded)
1108                 return;
1109
1110         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
1111                 return;
1112
1113         SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY], i)
1114                 if (unit_pending_active(other))
1115                         return;
1116
1117         SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
1118                 if (unit_pending_active(other))
1119                         return;
1120
1121         SET_FOREACH(other, u->dependencies[UNIT_WANTED_BY], i)
1122                 if (unit_pending_active(other))
1123                         return;
1124
1125         SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i)
1126                 if (unit_pending_active(other))
1127                         return;
1128
1129         log_info("Service %s is not needed anymore. Stopping.", u->id);
1130
1131         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1132         manager_add_job(u->manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
1133 }
1134
1135 static void retroactively_start_dependencies(Unit *u) {
1136         Iterator i;
1137         Unit *other;
1138
1139         assert(u);
1140         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
1141
1142         SET_FOREACH(other, u->dependencies[UNIT_REQUIRES], i)
1143                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1144                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1145                         manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1146
1147         SET_FOREACH(other, u->dependencies[UNIT_BINDS_TO], i)
1148                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1149                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1150                         manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1151
1152         SET_FOREACH(other, u->dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1153                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1154                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1155                         manager_add_job(u->manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1156
1157         SET_FOREACH(other, u->dependencies[UNIT_REQUISITE], i)
1158                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1159                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1160                         manager_add_job(u->manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1161
1162         SET_FOREACH(other, u->dependencies[UNIT_WANTS], i)
1163                 if (!set_get(u->dependencies[UNIT_AFTER], other) &&
1164                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1165                         manager_add_job(u->manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1166
1167         SET_FOREACH(other, u->dependencies[UNIT_CONFLICTS], i)
1168                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1169                         manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1170
1171         SET_FOREACH(other, u->dependencies[UNIT_CONFLICTED_BY], i)
1172                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1173                         manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1174 }
1175
1176 static void retroactively_stop_dependencies(Unit *u) {
1177         Iterator i;
1178         Unit *other;
1179
1180         assert(u);
1181         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1182
1183         /* Pull down units which are bound to us recursively if enabled */
1184         SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i)
1185                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1186                         manager_add_job(u->manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1187 }
1188
1189 static void check_unneeded_dependencies(Unit *u) {
1190         Iterator i;
1191         Unit *other;
1192
1193         assert(u);
1194         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1195
1196         /* Garbage collect services that might not be needed anymore, if enabled */
1197         SET_FOREACH(other, u->dependencies[UNIT_REQUIRES], i)
1198                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1199                         unit_check_unneeded(other);
1200         SET_FOREACH(other, u->dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1201                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1202                         unit_check_unneeded(other);
1203         SET_FOREACH(other, u->dependencies[UNIT_WANTS], i)
1204                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1205                         unit_check_unneeded(other);
1206         SET_FOREACH(other, u->dependencies[UNIT_REQUISITE], i)
1207                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1208                         unit_check_unneeded(other);
1209         SET_FOREACH(other, u->dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1210                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1211                         unit_check_unneeded(other);
1212         SET_FOREACH(other, u->dependencies[UNIT_BINDS_TO], i)
1213                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1214                         unit_check_unneeded(other);
1215 }
1216
1217 void unit_trigger_on_failure(Unit *u) {
1218         Unit *other;
1219         Iterator i;
1220
1221         assert(u);
1222
1223         if (set_size(u->dependencies[UNIT_ON_FAILURE]) <= 0)
1224                 return;
1225
1226         log_info("Triggering OnFailure= dependencies of %s.", u->id);
1227
1228         SET_FOREACH(other, u->dependencies[UNIT_ON_FAILURE], i) {
1229                 int r;
1230
1231                 if ((r = manager_add_job(u->manager, JOB_START, other, u->on_failure_isolate ? JOB_ISOLATE : JOB_REPLACE, true, NULL, NULL)) < 0)
1232                         log_error("Failed to enqueue OnFailure= job: %s", strerror(-r));
1233         }
1234 }
1235
1236 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) {
1237         bool unexpected;
1238
1239         assert(u);
1240         assert(os < _UNIT_ACTIVE_STATE_MAX);
1241         assert(ns < _UNIT_ACTIVE_STATE_MAX);
1242
1243         /* Note that this is called for all low-level state changes,
1244          * even if they might map to the same high-level
1245          * UnitActiveState! That means that ns == os is OK an expected
1246          * behaviour here. For example: if a mount point is remounted
1247          * this function will be called too! */
1248
1249         if (u->manager->n_reloading <= 0) {
1250                 dual_timestamp ts;
1251
1252                 dual_timestamp_get(&ts);
1253
1254                 if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1255                         u->inactive_exit_timestamp = ts;
1256                 else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1257                         u->inactive_enter_timestamp = ts;
1258
1259                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1260                         u->active_enter_timestamp = ts;
1261                 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1262                         u->active_exit_timestamp = ts;
1263
1264                 timer_unit_notify(u, ns);
1265                 path_unit_notify(u, ns);
1266         }
1267
1268         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1269                 cgroup_bonding_trim_list(u->cgroup_bondings, true);
1270
1271         if (u->job) {
1272                 unexpected = false;
1273
1274                 if (u->job->state == JOB_WAITING)
1275
1276                         /* So we reached a different state for this
1277                          * job. Let's see if we can run it now if it
1278                          * failed previously due to EAGAIN. */
1279                         job_add_to_run_queue(u->job);
1280
1281                 /* Let's check whether this state change constitutes a
1282                  * finished job, or maybe contradicts a running job and
1283                  * hence needs to invalidate jobs. */
1284
1285                 switch (u->job->type) {
1286
1287                 case JOB_START:
1288                 case JOB_VERIFY_ACTIVE:
1289
1290                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1291                                 job_finish_and_invalidate(u->job, JOB_DONE, true);
1292                         else if (u->job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1293                                 unexpected = true;
1294
1295                                 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1296                                         job_finish_and_invalidate(u->job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE, true);
1297                         }
1298
1299                         break;
1300
1301                 case JOB_RELOAD:
1302                 case JOB_RELOAD_OR_START:
1303
1304                         if (u->job->state == JOB_RUNNING) {
1305                                 if (ns == UNIT_ACTIVE)
1306                                         job_finish_and_invalidate(u->job, reload_success ? JOB_DONE : JOB_FAILED, true);
1307                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1308                                         unexpected = true;
1309
1310                                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1311                                                 job_finish_and_invalidate(u->job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE, true);
1312                                 }
1313                         }
1314
1315                         break;
1316
1317                 case JOB_STOP:
1318                 case JOB_RESTART:
1319                 case JOB_TRY_RESTART:
1320
1321                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1322                                 job_finish_and_invalidate(u->job, JOB_DONE, true);
1323                         else if (u->job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1324                                 unexpected = true;
1325                                 job_finish_and_invalidate(u->job, JOB_FAILED, true);
1326                         }
1327
1328                         break;
1329
1330                 default:
1331                         assert_not_reached("Job type unknown");
1332                 }
1333
1334         } else
1335                 unexpected = true;
1336
1337         if (u->manager->n_reloading <= 0) {
1338
1339                 /* If this state change happened without being
1340                  * requested by a job, then let's retroactively start
1341                  * or stop dependencies. We skip that step when
1342                  * deserializing, since we don't want to create any
1343                  * additional jobs just because something is already
1344                  * activated. */
1345
1346                 if (unexpected) {
1347                         if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1348                                 retroactively_start_dependencies(u);
1349                         else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1350                                 retroactively_stop_dependencies(u);
1351                 }
1352
1353                 /* stop unneeded units regardless if going down was expected or not */
1354                 if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1355                         check_unneeded_dependencies(u);
1356
1357                 if (ns != os && ns == UNIT_FAILED) {
1358                         log_notice("Unit %s entered failed state.", u->id);
1359                         unit_trigger_on_failure(u);
1360                 }
1361         }
1362
1363         /* Some names are special */
1364         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1365
1366                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1367                         /* The bus just might have become available,
1368                          * hence try to connect to it, if we aren't
1369                          * yet connected. */
1370                         bus_init(u->manager, true);
1371
1372                 if (u->type == UNIT_SERVICE &&
1373                     !UNIT_IS_ACTIVE_OR_RELOADING(os) &&
1374                     u->manager->n_reloading <= 0) {
1375                         /* Write audit record if we have just finished starting up */
1376                         manager_send_unit_audit(u->manager, u, AUDIT_SERVICE_START, true);
1377                         u->in_audit = true;
1378                 }
1379
1380                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1381                         manager_send_unit_plymouth(u->manager, u);
1382
1383         } else {
1384
1385                 /* We don't care about D-Bus here, since we'll get an
1386                  * asynchronous notification for it anyway. */
1387
1388                 if (u->type == UNIT_SERVICE &&
1389                     UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1390                     !UNIT_IS_INACTIVE_OR_FAILED(os) &&
1391                     u->manager->n_reloading <= 0) {
1392
1393                         /* Hmm, if there was no start record written
1394                          * write it now, so that we always have a nice
1395                          * pair */
1396                         if (!u->in_audit) {
1397                                 manager_send_unit_audit(u->manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1398
1399                                 if (ns == UNIT_INACTIVE)
1400                                         manager_send_unit_audit(u->manager, u, AUDIT_SERVICE_STOP, true);
1401                         } else
1402                                 /* Write audit record if we have just finished shutting down */
1403                                 manager_send_unit_audit(u->manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1404
1405                         u->in_audit = false;
1406                 }
1407         }
1408
1409         manager_recheck_journal(u->manager);
1410
1411         /* Maybe we finished startup and are now ready for being
1412          * stopped because unneeded? */
1413         unit_check_unneeded(u);
1414
1415         unit_add_to_dbus_queue(u);
1416         unit_add_to_gc_queue(u);
1417 }
1418
1419 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1420         struct epoll_event ev;
1421
1422         assert(u);
1423         assert(fd >= 0);
1424         assert(w);
1425         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1426
1427         zero(ev);
1428         ev.data.ptr = w;
1429         ev.events = events;
1430
1431         if (epoll_ctl(u->manager->epoll_fd,
1432                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1433                       fd,
1434                       &ev) < 0)
1435                 return -errno;
1436
1437         w->fd = fd;
1438         w->type = WATCH_FD;
1439         w->data.unit = u;
1440
1441         return 0;
1442 }
1443
1444 void unit_unwatch_fd(Unit *u, Watch *w) {
1445         assert(u);
1446         assert(w);
1447
1448         if (w->type == WATCH_INVALID)
1449                 return;
1450
1451         assert(w->type == WATCH_FD);
1452         assert(w->data.unit == u);
1453         assert_se(epoll_ctl(u->manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1454
1455         w->fd = -1;
1456         w->type = WATCH_INVALID;
1457         w->data.unit = NULL;
1458 }
1459
1460 int unit_watch_pid(Unit *u, pid_t pid) {
1461         assert(u);
1462         assert(pid >= 1);
1463
1464         /* Watch a specific PID. We only support one unit watching
1465          * each PID for now. */
1466
1467         return hashmap_put(u->manager->watch_pids, LONG_TO_PTR(pid), u);
1468 }
1469
1470 void unit_unwatch_pid(Unit *u, pid_t pid) {
1471         assert(u);
1472         assert(pid >= 1);
1473
1474         hashmap_remove_value(u->manager->watch_pids, LONG_TO_PTR(pid), u);
1475 }
1476
1477 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1478         struct itimerspec its;
1479         int flags, fd;
1480         bool ours;
1481
1482         assert(u);
1483         assert(w);
1484         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1485
1486         /* This will try to reuse the old timer if there is one */
1487
1488         if (w->type == WATCH_UNIT_TIMER) {
1489                 assert(w->data.unit == u);
1490                 assert(w->fd >= 0);
1491
1492                 ours = false;
1493                 fd = w->fd;
1494         } else if (w->type == WATCH_INVALID) {
1495
1496                 ours = true;
1497                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1498                         return -errno;
1499         } else
1500                 assert_not_reached("Invalid watch type");
1501
1502         zero(its);
1503
1504         if (delay <= 0) {
1505                 /* Set absolute time in the past, but not 0, since we
1506                  * don't want to disarm the timer */
1507                 its.it_value.tv_sec = 0;
1508                 its.it_value.tv_nsec = 1;
1509
1510                 flags = TFD_TIMER_ABSTIME;
1511         } else {
1512                 timespec_store(&its.it_value, delay);
1513                 flags = 0;
1514         }
1515
1516         /* This will also flush the elapse counter */
1517         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1518                 goto fail;
1519
1520         if (w->type == WATCH_INVALID) {
1521                 struct epoll_event ev;
1522
1523                 zero(ev);
1524                 ev.data.ptr = w;
1525                 ev.events = EPOLLIN;
1526
1527                 if (epoll_ctl(u->manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1528                         goto fail;
1529         }
1530
1531         w->type = WATCH_UNIT_TIMER;
1532         w->fd = fd;
1533         w->data.unit = u;
1534
1535         return 0;
1536
1537 fail:
1538         if (ours)
1539                 close_nointr_nofail(fd);
1540
1541         return -errno;
1542 }
1543
1544 void unit_unwatch_timer(Unit *u, Watch *w) {
1545         assert(u);
1546         assert(w);
1547
1548         if (w->type == WATCH_INVALID)
1549                 return;
1550
1551         assert(w->type == WATCH_UNIT_TIMER);
1552         assert(w->data.unit == u);
1553         assert(w->fd >= 0);
1554
1555         assert_se(epoll_ctl(u->manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1556         close_nointr_nofail(w->fd);
1557
1558         w->fd = -1;
1559         w->type = WATCH_INVALID;
1560         w->data.unit = NULL;
1561 }
1562
1563 bool unit_job_is_applicable(Unit *u, JobType j) {
1564         assert(u);
1565         assert(j >= 0 && j < _JOB_TYPE_MAX);
1566
1567         switch (j) {
1568
1569         case JOB_VERIFY_ACTIVE:
1570         case JOB_START:
1571         case JOB_STOP:
1572         case JOB_NOP:
1573                 return true;
1574
1575         case JOB_RESTART:
1576         case JOB_TRY_RESTART:
1577                 return unit_can_start(u);
1578
1579         case JOB_RELOAD:
1580                 return unit_can_reload(u);
1581
1582         case JOB_RELOAD_OR_START:
1583                 return unit_can_reload(u) && unit_can_start(u);
1584
1585         default:
1586                 assert_not_reached("Invalid job type");
1587         }
1588 }
1589
1590 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1591
1592         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1593                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1594                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1595                 [UNIT_WANTS] = UNIT_WANTED_BY,
1596                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1597                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1598                 [UNIT_BINDS_TO] = UNIT_BOUND_BY,
1599                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1600                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1601                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1602                 [UNIT_BOUND_BY] = UNIT_BINDS_TO,
1603                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1604                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1605                 [UNIT_BEFORE] = UNIT_AFTER,
1606                 [UNIT_AFTER] = UNIT_BEFORE,
1607                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1608                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1609                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES,
1610                 [UNIT_TRIGGERS] = UNIT_TRIGGERED_BY,
1611                 [UNIT_TRIGGERED_BY] = UNIT_TRIGGERS,
1612                 [UNIT_PROPAGATES_RELOAD_TO] = UNIT_RELOAD_PROPAGATED_FROM,
1613                 [UNIT_RELOAD_PROPAGATED_FROM] = UNIT_PROPAGATES_RELOAD_TO,
1614                 [UNIT_PART_OF] = UNIT_CONSISTS_OF
1615         };
1616         int r, q = 0, v = 0, w = 0;
1617
1618         assert(u);
1619         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1620         assert(other);
1621
1622         u = unit_follow_merge(u);
1623         other = unit_follow_merge(other);
1624
1625         /* We won't allow dependencies on ourselves. We will not
1626          * consider them an error however. */
1627         if (u == other)
1628                 return 0;
1629
1630         if ((r = set_ensure_allocated(&u->dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1631                 return r;
1632
1633         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1634                 if ((r = set_ensure_allocated(&other->dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1635                         return r;
1636
1637         if (add_reference)
1638                 if ((r = set_ensure_allocated(&u->dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1639                     (r = set_ensure_allocated(&other->dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1640                         return r;
1641
1642         if ((q = set_put(u->dependencies[d], other)) < 0)
1643                 return q;
1644
1645         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1646                 if ((v = set_put(other->dependencies[inverse_table[d]], u)) < 0) {
1647                         r = v;
1648                         goto fail;
1649                 }
1650
1651         if (add_reference) {
1652                 if ((w = set_put(u->dependencies[UNIT_REFERENCES], other)) < 0) {
1653                         r = w;
1654                         goto fail;
1655                 }
1656
1657                 if ((r = set_put(other->dependencies[UNIT_REFERENCED_BY], u)) < 0)
1658                         goto fail;
1659         }
1660
1661         unit_add_to_dbus_queue(u);
1662         return 0;
1663
1664 fail:
1665         if (q > 0)
1666                 set_remove(u->dependencies[d], other);
1667
1668         if (v > 0)
1669                 set_remove(other->dependencies[inverse_table[d]], u);
1670
1671         if (w > 0)
1672                 set_remove(u->dependencies[UNIT_REFERENCES], other);
1673
1674         return r;
1675 }
1676
1677 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1678         int r;
1679
1680         assert(u);
1681
1682         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1683                 return r;
1684
1685         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1686                 return r;
1687
1688         return 0;
1689 }
1690
1691 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1692         char *s;
1693
1694         assert(u);
1695         assert(name || path);
1696
1697         if (!name)
1698                 name = path_get_file_name(path);
1699
1700         if (!unit_name_is_template(name)) {
1701                 *p = NULL;
1702                 return name;
1703         }
1704
1705         if (u->instance)
1706                 s = unit_name_replace_instance(name, u->instance);
1707         else {
1708                 char *i;
1709
1710                 if (!(i = unit_name_to_prefix(u->id)))
1711                         return NULL;
1712
1713                 s = unit_name_replace_instance(name, i);
1714                 free(i);
1715         }
1716
1717         if (!s)
1718                 return NULL;
1719
1720         *p = s;
1721         return s;
1722 }
1723
1724 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1725         Unit *other;
1726         int r;
1727         char *s;
1728
1729         assert(u);
1730         assert(name || path);
1731
1732         if (!(name = resolve_template(u, name, path, &s)))
1733                 return -ENOMEM;
1734
1735         if ((r = manager_load_unit(u->manager, name, path, NULL, &other)) < 0)
1736                 goto finish;
1737
1738         r = unit_add_dependency(u, d, other, add_reference);
1739
1740 finish:
1741         free(s);
1742         return r;
1743 }
1744
1745 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1746         Unit *other;
1747         int r;
1748         char *s;
1749
1750         assert(u);
1751         assert(name || path);
1752
1753         if (!(name = resolve_template(u, name, path, &s)))
1754                 return -ENOMEM;
1755
1756         if ((r = manager_load_unit(u->manager, name, path, NULL, &other)) < 0)
1757                 goto finish;
1758
1759         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1760
1761 finish:
1762         free(s);
1763         return r;
1764 }
1765
1766 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1767         Unit *other;
1768         int r;
1769         char *s;
1770
1771         assert(u);
1772         assert(name || path);
1773
1774         if (!(name = resolve_template(u, name, path, &s)))
1775                 return -ENOMEM;
1776
1777         if ((r = manager_load_unit(u->manager, name, path, NULL, &other)) < 0)
1778                 goto finish;
1779
1780         r = unit_add_dependency(other, d, u, add_reference);
1781
1782 finish:
1783         free(s);
1784         return r;
1785 }
1786
1787 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1788         Unit *other;
1789         int r;
1790         char *s;
1791
1792         assert(u);
1793         assert(name || path);
1794
1795         if (!(name = resolve_template(u, name, path, &s)))
1796                 return -ENOMEM;
1797
1798         if ((r = manager_load_unit(u->manager, name, path, NULL, &other)) < 0)
1799                 goto finish;
1800
1801         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1802                 goto finish;
1803
1804 finish:
1805         free(s);
1806         return r;
1807 }
1808
1809 int set_unit_path(const char *p) {
1810         char *cwd, *c;
1811         int r;
1812
1813         /* This is mostly for debug purposes */
1814
1815         if (path_is_absolute(p)) {
1816                 if (!(c = strdup(p)))
1817                         return -ENOMEM;
1818         } else {
1819                 if (!(cwd = get_current_dir_name()))
1820                         return -errno;
1821
1822                 r = asprintf(&c, "%s/%s", cwd, p);
1823                 free(cwd);
1824
1825                 if (r < 0)
1826                         return -ENOMEM;
1827         }
1828
1829         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1830                 r = -errno;
1831                 free(c);
1832                 return r;
1833         }
1834
1835         return 0;
1836 }
1837
1838 char *unit_dbus_path(Unit *u) {
1839         assert(u);
1840
1841         if (!u->id)
1842                 return NULL;
1843
1844         return unit_dbus_path_from_name(u->id);
1845 }
1846
1847 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1848         int r;
1849
1850         assert(u);
1851         assert(b);
1852
1853         assert(b->path);
1854
1855         if (!b->controller) {
1856                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1857                         return -ENOMEM;
1858
1859                 b->ours = true;
1860         }
1861
1862         /* Ensure this hasn't been added yet */
1863         assert(!b->unit);
1864
1865         if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
1866                 CGroupBonding *l;
1867
1868                 l = hashmap_get(u->manager->cgroup_bondings, b->path);
1869                 LIST_PREPEND(CGroupBonding, by_path, l, b);
1870
1871                 if ((r = hashmap_replace(u->manager->cgroup_bondings, b->path, l)) < 0) {
1872                         LIST_REMOVE(CGroupBonding, by_path, l, b);
1873                         return r;
1874                 }
1875         }
1876
1877         LIST_PREPEND(CGroupBonding, by_unit, u->cgroup_bondings, b);
1878         b->unit = u;
1879
1880         return 0;
1881 }
1882
1883 static char *default_cgroup_path(Unit *u) {
1884         char *p;
1885
1886         assert(u);
1887
1888         if (u->instance) {
1889                 char *t;
1890
1891                 t = unit_name_template(u->id);
1892                 if (!t)
1893                         return NULL;
1894
1895                 p = strjoin(u->manager->cgroup_hierarchy, "/", t, "/", u->instance, NULL);
1896                 free(t);
1897         } else
1898                 p = strjoin(u->manager->cgroup_hierarchy, "/", u->id, NULL);
1899
1900         return p;
1901 }
1902
1903 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1904         char *controller = NULL, *path = NULL;
1905         CGroupBonding *b = NULL;
1906         bool ours = false;
1907         int r;
1908
1909         assert(u);
1910         assert(name);
1911
1912         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1913                 return r;
1914
1915         if (!path) {
1916                 path = default_cgroup_path(u);
1917                 ours = true;
1918         }
1919
1920         if (!controller) {
1921                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1922                 ours = true;
1923         }
1924
1925         if (!path || !controller) {
1926                 free(path);
1927                 free(controller);
1928
1929                 return -ENOMEM;
1930         }
1931
1932         if (cgroup_bonding_find_list(u->cgroup_bondings, controller)) {
1933                 r = -EEXIST;
1934                 goto fail;
1935         }
1936
1937         if (!(b = new0(CGroupBonding, 1))) {
1938                 r = -ENOMEM;
1939                 goto fail;
1940         }
1941
1942         b->controller = controller;
1943         b->path = path;
1944         b->ours = ours;
1945         b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1946
1947         if ((r = unit_add_cgroup(u, b)) < 0)
1948                 goto fail;
1949
1950         return 0;
1951
1952 fail:
1953         free(path);
1954         free(controller);
1955         free(b);
1956
1957         return r;
1958 }
1959
1960 static int unit_add_one_default_cgroup(Unit *u, const char *controller) {
1961         CGroupBonding *b = NULL;
1962         int r = -ENOMEM;
1963
1964         assert(u);
1965
1966         if (!controller)
1967                 controller = SYSTEMD_CGROUP_CONTROLLER;
1968
1969         if (cgroup_bonding_find_list(u->cgroup_bondings, controller))
1970                 return 0;
1971
1972         if (!(b = new0(CGroupBonding, 1)))
1973                 return -ENOMEM;
1974
1975         if (!(b->controller = strdup(controller)))
1976                 goto fail;
1977
1978         if (!(b->path = default_cgroup_path(u)))
1979                 goto fail;
1980
1981         b->ours = true;
1982         b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1983
1984         if ((r = unit_add_cgroup(u, b)) < 0)
1985                 goto fail;
1986
1987         return 0;
1988
1989 fail:
1990         free(b->path);
1991         free(b->controller);
1992         free(b);
1993
1994         return r;
1995 }
1996
1997 int unit_add_default_cgroups(Unit *u) {
1998         CGroupAttribute *a;
1999         char **c;
2000         int r;
2001
2002         assert(u);
2003
2004         /* Adds in the default cgroups, if they weren't specified
2005          * otherwise. */
2006
2007         if (!u->manager->cgroup_hierarchy)
2008                 return 0;
2009
2010         if ((r = unit_add_one_default_cgroup(u, NULL)) < 0)
2011                 return r;
2012
2013         STRV_FOREACH(c, u->manager->default_controllers)
2014                 unit_add_one_default_cgroup(u, *c);
2015
2016         LIST_FOREACH(by_unit, a, u->cgroup_attributes)
2017                 unit_add_one_default_cgroup(u, a->controller);
2018
2019         return 0;
2020 }
2021
2022 CGroupBonding* unit_get_default_cgroup(Unit *u) {
2023         assert(u);
2024
2025         return cgroup_bonding_find_list(u->cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
2026 }
2027
2028 int unit_add_cgroup_attribute(Unit *u, const char *controller, const char *name, const char *value, CGroupAttributeMapCallback map_callback) {
2029         int r;
2030         char *c = NULL;
2031         CGroupAttribute *a;
2032
2033         assert(u);
2034         assert(name);
2035         assert(value);
2036
2037         if (!controller) {
2038                 const char *dot;
2039
2040                 dot = strchr(name, '.');
2041                 if (!dot)
2042                         return -EINVAL;
2043
2044                 c = strndup(name, dot - name);
2045                 if (!c)
2046                         return -ENOMEM;
2047
2048                 controller = c;
2049         }
2050
2051         if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) {
2052                 r = -EINVAL;
2053                 goto finish;
2054         }
2055
2056         a = new0(CGroupAttribute, 1);
2057         if (!a) {
2058                 r = -ENOMEM;
2059                 goto finish;
2060         }
2061
2062         if (c) {
2063                 a->controller = c;
2064                 c = NULL;
2065         } else
2066                 a->controller = strdup(controller);
2067
2068         a->name = strdup(name);
2069         a->value = strdup(value);
2070
2071         if (!a->controller || !a->name || !a->value) {
2072                 free(a->controller);
2073                 free(a->name);
2074                 free(a->value);
2075                 free(a);
2076
2077                 return -ENOMEM;
2078         }
2079
2080         a->map_callback = map_callback;
2081
2082         LIST_PREPEND(CGroupAttribute, by_unit, u->cgroup_attributes, a);
2083
2084         r = 0;
2085
2086 finish:
2087         free(c);
2088         return r;
2089 }
2090
2091 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
2092         char *t;
2093         int r;
2094
2095         assert(u);
2096         assert(type);
2097         assert(_found);
2098
2099         if (!(t = unit_name_change_suffix(u->id, type)))
2100                 return -ENOMEM;
2101
2102         assert(!unit_has_name(u, t));
2103
2104         r = manager_load_unit(u->manager, t, NULL, NULL, _found);
2105         free(t);
2106
2107         assert(r < 0 || *_found != u);
2108
2109         return r;
2110 }
2111
2112 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
2113         Unit *found;
2114         char *t;
2115
2116         assert(u);
2117         assert(type);
2118         assert(_found);
2119
2120         if (!(t = unit_name_change_suffix(u->id, type)))
2121                 return -ENOMEM;
2122
2123         assert(!unit_has_name(u, t));
2124
2125         found = manager_get_unit(u->manager, t);
2126         free(t);
2127
2128         if (!found)
2129                 return -ENOENT;
2130
2131         *_found = found;
2132         return 0;
2133 }
2134
2135 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
2136         Unit *u = userdata;
2137         assert(u);
2138
2139         return unit_name_to_prefix_and_instance(u->id);
2140 }
2141
2142 static char *specifier_prefix(char specifier, void *data, void *userdata) {
2143         Unit *u = userdata;
2144         assert(u);
2145
2146         return unit_name_to_prefix(u->id);
2147 }
2148
2149 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
2150         Unit *u = userdata;
2151         char *p, *r;
2152
2153         assert(u);
2154
2155         if (!(p = unit_name_to_prefix(u->id)))
2156                 return NULL;
2157
2158         r = unit_name_unescape(p);
2159         free(p);
2160
2161         return r;
2162 }
2163
2164 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
2165         Unit *u = userdata;
2166         assert(u);
2167
2168         if (u->instance)
2169                 return unit_name_unescape(u->instance);
2170
2171         return strdup("");
2172 }
2173
2174 static char *specifier_filename(char specifier, void *data, void *userdata) {
2175         Unit *u = userdata;
2176         assert(u);
2177
2178         if (u->instance)
2179                 return unit_name_path_unescape(u->instance);
2180
2181         return unit_name_to_path(u->instance);
2182 }
2183
2184 static char *specifier_cgroup(char specifier, void *data, void *userdata) {
2185         Unit *u = userdata;
2186         assert(u);
2187
2188         return default_cgroup_path(u);
2189 }
2190
2191 static char *specifier_cgroup_root(char specifier, void *data, void *userdata) {
2192         Unit *u = userdata;
2193         char *p;
2194         assert(u);
2195
2196         if (specifier == 'r')
2197                 return strdup(u->manager->cgroup_hierarchy);
2198
2199         if (path_get_parent(u->manager->cgroup_hierarchy, &p) < 0)
2200                 return strdup("");
2201
2202         if (streq(p, "/")) {
2203                 free(p);
2204                 return strdup("");
2205         }
2206
2207         return p;
2208 }
2209
2210 static char *specifier_runtime(char specifier, void *data, void *userdata) {
2211         Unit *u = userdata;
2212         assert(u);
2213
2214         if (u->manager->running_as == MANAGER_USER) {
2215                 const char *e;
2216
2217                 e = getenv("XDG_RUNTIME_DIR");
2218                 if (e)
2219                         return strdup(e);
2220         }
2221
2222         return strdup("/run");
2223 }
2224
2225 static char *specifier_user_name(char specifier, void *data, void *userdata) {
2226         Service *s = userdata;
2227         int r;
2228         const char *username;
2229
2230         /* get USER env from our own env if set */
2231         if (!s->exec_context.user)
2232                 return getusername_malloc();
2233
2234         /* fish username from passwd */
2235         username = s->exec_context.user;
2236         r = get_user_creds(&username, NULL, NULL, NULL, NULL);
2237         if (r < 0)
2238                 return NULL;
2239
2240         return strdup(username);
2241 }
2242
2243 static char *specifier_user_home(char specifier, void *data, void *userdata) {
2244         Service *s = userdata;
2245         int r;
2246         const char *username, *home;
2247
2248         /* return HOME if set, otherwise from passwd */
2249         if (!s->exec_context.user) {
2250                 char *h;
2251
2252                 r = get_home_dir(&h);
2253                 if (r < 0)
2254                         return NULL;
2255
2256                 return h;
2257         }
2258
2259         username = s->exec_context.user;
2260         r = get_user_creds(&username, NULL, NULL, &home, NULL);
2261         if (r < 0)
2262                return NULL;
2263
2264         return strdup(home);
2265 }
2266
2267 static char *specifier_user_shell(char specifier, void *data, void *userdata) {
2268         Service *s = userdata;
2269         int r;
2270         const char *username, *shell;
2271
2272         /* return HOME if set, otherwise from passwd */
2273         if (!s->exec_context.user) {
2274                 char *sh;
2275
2276                 r = get_shell(&sh);
2277                 if (r < 0)
2278                         return strdup("/bin/sh");
2279
2280                 return sh;
2281         }
2282
2283         username = s->exec_context.user;
2284         r = get_user_creds(&username, NULL, NULL, NULL, &shell);
2285         if (r < 0)
2286                 return strdup("/bin/sh");
2287
2288         return strdup(shell);
2289 }
2290
2291 char *unit_name_printf(Unit *u, const char* format) {
2292
2293         /*
2294          * This will use the passed string as format string and
2295          * replace the following specifiers:
2296          *
2297          * %n: the full id of the unit                 (foo@bar.waldo)
2298          * %N: the id of the unit without the suffix   (foo@bar)
2299          * %p: the prefix                              (foo)
2300          * %i: the instance                            (bar)
2301          */
2302
2303         const Specifier table[] = {
2304                 { 'n', specifier_string,              u->id },
2305                 { 'N', specifier_prefix_and_instance, NULL },
2306                 { 'p', specifier_prefix,              NULL },
2307                 { 'i', specifier_string,              u->instance },
2308                 { 0, NULL, NULL }
2309         };
2310
2311         assert(u);
2312         assert(format);
2313
2314         return specifier_printf(format, table, u);
2315 }
2316
2317 char *unit_full_printf(Unit *u, const char *format) {
2318
2319         /* This is similar to unit_name_printf() but also supports
2320          * unescaping. Also, adds a couple of additional codes:
2321          *
2322          * %c cgroup path of unit
2323          * %r root cgroup path of this systemd instance (e.g. "/user/lennart/shared/systemd-4711")
2324          * %R parent of root cgroup path (e.g. "/usr/lennart/shared")
2325          * %t the runtime directory to place sockets in (e.g. "/run" or $XDG_RUNTIME_DIR)
2326          * %u the username of the configured User or running user
2327          * %h the homedir of the configured User or running user
2328          */
2329
2330         const Specifier table[] = {
2331                 { 'n', specifier_string,              u->id },
2332                 { 'N', specifier_prefix_and_instance, NULL },
2333                 { 'p', specifier_prefix,              NULL },
2334                 { 'P', specifier_prefix_unescaped,    NULL },
2335                 { 'i', specifier_string,              u->instance },
2336                 { 'I', specifier_instance_unescaped,  NULL },
2337                 { 'f', specifier_filename,            NULL },
2338                 { 'c', specifier_cgroup,              NULL },
2339                 { 'r', specifier_cgroup_root,         NULL },
2340                 { 'R', specifier_cgroup_root,         NULL },
2341                 { 't', specifier_runtime,             NULL },
2342                 { 'u', specifier_user_name,           NULL },
2343                 { 'h', specifier_user_home,           NULL },
2344                 { 's', specifier_user_shell,          NULL },
2345                 { 0, NULL, NULL }
2346         };
2347
2348         assert(u);
2349         assert(format);
2350
2351         return specifier_printf(format, table, u);
2352 }
2353
2354 char **unit_full_printf_strv(Unit *u, char **l) {
2355         size_t n;
2356         char **r, **i, **j;
2357
2358         /* Applies unit_full_printf to every entry in l */
2359
2360         assert(u);
2361
2362         n = strv_length(l);
2363         if (!(r = new(char*, n+1)))
2364                 return NULL;
2365
2366         for (i = l, j = r; *i; i++, j++)
2367                 if (!(*j = unit_full_printf(u, *i)))
2368                         goto fail;
2369
2370         *j = NULL;
2371         return r;
2372
2373 fail:
2374         for (j--; j >= r; j--)
2375                 free(*j);
2376
2377         free(r);
2378
2379         return NULL;
2380 }
2381
2382 int unit_watch_bus_name(Unit *u, const char *name) {
2383         assert(u);
2384         assert(name);
2385
2386         /* Watch a specific name on the bus. We only support one unit
2387          * watching each name for now. */
2388
2389         return hashmap_put(u->manager->watch_bus, name, u);
2390 }
2391
2392 void unit_unwatch_bus_name(Unit *u, const char *name) {
2393         assert(u);
2394         assert(name);
2395
2396         hashmap_remove_value(u->manager->watch_bus, name, u);
2397 }
2398
2399 bool unit_can_serialize(Unit *u) {
2400         assert(u);
2401
2402         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
2403 }
2404
2405 int unit_serialize(Unit *u, FILE *f, FDSet *fds, bool serialize_jobs) {
2406         int r;
2407
2408         assert(u);
2409         assert(f);
2410         assert(fds);
2411
2412         if (!unit_can_serialize(u))
2413                 return 0;
2414
2415         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
2416                 return r;
2417
2418
2419         if (serialize_jobs) {
2420                 if (u->job) {
2421                         fprintf(f, "job\n");
2422                         job_serialize(u->job, f, fds);
2423                 }
2424
2425                 if (u->nop_job) {
2426                         fprintf(f, "job\n");
2427                         job_serialize(u->nop_job, f, fds);
2428                 }
2429         }
2430
2431         dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->inactive_exit_timestamp);
2432         dual_timestamp_serialize(f, "active-enter-timestamp", &u->active_enter_timestamp);
2433         dual_timestamp_serialize(f, "active-exit-timestamp", &u->active_exit_timestamp);
2434         dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->inactive_enter_timestamp);
2435         dual_timestamp_serialize(f, "condition-timestamp", &u->condition_timestamp);
2436
2437         if (dual_timestamp_is_set(&u->condition_timestamp))
2438                 unit_serialize_item(u, f, "condition-result", yes_no(u->condition_result));
2439
2440         /* End marker */
2441         fputc('\n', f);
2442         return 0;
2443 }
2444
2445 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2446         va_list ap;
2447
2448         assert(u);
2449         assert(f);
2450         assert(key);
2451         assert(format);
2452
2453         fputs(key, f);
2454         fputc('=', f);
2455
2456         va_start(ap, format);
2457         vfprintf(f, format, ap);
2458         va_end(ap);
2459
2460         fputc('\n', f);
2461 }
2462
2463 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2464         assert(u);
2465         assert(f);
2466         assert(key);
2467         assert(value);
2468
2469         fprintf(f, "%s=%s\n", key, value);
2470 }
2471
2472 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2473         int r;
2474
2475         assert(u);
2476         assert(f);
2477         assert(fds);
2478
2479         if (!unit_can_serialize(u))
2480                 return 0;
2481
2482         for (;;) {
2483                 char line[LINE_MAX], *l, *v;
2484                 size_t k;
2485
2486                 if (!fgets(line, sizeof(line), f)) {
2487                         if (feof(f))
2488                                 return 0;
2489                         return -errno;
2490                 }
2491
2492                 char_array_0(line);
2493                 l = strstrip(line);
2494
2495                 /* End marker */
2496                 if (l[0] == 0)
2497                         return 0;
2498
2499                 k = strcspn(l, "=");
2500
2501                 if (l[k] == '=') {
2502                         l[k] = 0;
2503                         v = l+k+1;
2504                 } else
2505                         v = l+k;
2506
2507                 if (streq(l, "job")) {
2508                         if (v[0] == '\0') {
2509                                 /* new-style serialized job */
2510                                 Job *j = job_new_raw(u);
2511                                 if (!j)
2512                                         return -ENOMEM;
2513
2514                                 r = job_deserialize(j, f, fds);
2515                                 if (r < 0) {
2516                                         job_free(j);
2517                                         return r;
2518                                 }
2519
2520                                 r = hashmap_put(u->manager->jobs, UINT32_TO_PTR(j->id), j);
2521                                 if (r < 0) {
2522                                         job_free(j);
2523                                         return r;
2524                                 }
2525
2526                                 r = job_install_deserialized(j);
2527                                 if (r < 0) {
2528                                         hashmap_remove(u->manager->jobs, UINT32_TO_PTR(j->id));
2529                                         job_free(j);
2530                                         return r;
2531                                 }
2532                         } else {
2533                                 /* legacy */
2534                                 JobType type = job_type_from_string(v);
2535                                 if (type < 0)
2536                                         log_debug("Failed to parse job type value %s", v);
2537                                 else
2538                                         u->deserialized_job = type;
2539                         }
2540                         continue;
2541                 } else if (streq(l, "inactive-exit-timestamp")) {
2542                         dual_timestamp_deserialize(v, &u->inactive_exit_timestamp);
2543                         continue;
2544                 } else if (streq(l, "active-enter-timestamp")) {
2545                         dual_timestamp_deserialize(v, &u->active_enter_timestamp);
2546                         continue;
2547                 } else if (streq(l, "active-exit-timestamp")) {
2548                         dual_timestamp_deserialize(v, &u->active_exit_timestamp);
2549                         continue;
2550                 } else if (streq(l, "inactive-enter-timestamp")) {
2551                         dual_timestamp_deserialize(v, &u->inactive_enter_timestamp);
2552                         continue;
2553                 } else if (streq(l, "condition-timestamp")) {
2554                         dual_timestamp_deserialize(v, &u->condition_timestamp);
2555                         continue;
2556                 } else if (streq(l, "condition-result")) {
2557                         int b;
2558
2559                         if ((b = parse_boolean(v)) < 0)
2560                                 log_debug("Failed to parse condition result value %s", v);
2561                         else
2562                                 u->condition_result = b;
2563
2564                         continue;
2565                 }
2566
2567                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2568                         return r;
2569         }
2570 }
2571
2572 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2573         Unit *device;
2574         char *e;
2575         int r;
2576
2577         assert(u);
2578
2579         if (!what)
2580                 return 0;
2581
2582         /* Adds in links to the device node that this unit is based on */
2583
2584         if (!is_device_path(what))
2585                 return 0;
2586
2587         e = unit_name_from_path(what, ".device");
2588         if (!e)
2589                 return -ENOMEM;
2590
2591         r = manager_load_unit(u->manager, e, NULL, NULL, &device);
2592         free(e);
2593
2594         if (r < 0)
2595                 return r;
2596
2597         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BINDS_TO, device, true)) < 0)
2598                 return r;
2599
2600         if (wants)
2601                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2602                         return r;
2603
2604         return 0;
2605 }
2606
2607 int unit_coldplug(Unit *u) {
2608         int r;
2609
2610         assert(u);
2611
2612         if (UNIT_VTABLE(u)->coldplug)
2613                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2614                         return r;
2615
2616         if (u->job) {
2617                 r = job_coldplug(u->job);
2618                 if (r < 0)
2619                         return r;
2620         } else if (u->deserialized_job >= 0) {
2621                 /* legacy */
2622                 r = manager_add_job(u->manager, u->deserialized_job, u, JOB_IGNORE_REQUIREMENTS, false, NULL, NULL);
2623                 if (r < 0)
2624                         return r;
2625
2626                 u->deserialized_job = _JOB_TYPE_INVALID;
2627         }
2628
2629         return 0;
2630 }
2631
2632 void unit_status_printf(Unit *u, const char *status, const char *format, ...) {
2633         va_list ap;
2634
2635         assert(u);
2636         assert(format);
2637
2638         if (!manager_get_show_status(u->manager))
2639                 return;
2640
2641         if (!manager_is_booting_or_shutting_down(u->manager))
2642                 return;
2643
2644         va_start(ap, format);
2645         status_vprintf(status, true, format, ap);
2646         va_end(ap);
2647 }
2648
2649 bool unit_need_daemon_reload(Unit *u) {
2650         struct stat st;
2651
2652         assert(u);
2653
2654         if (u->fragment_path) {
2655                 zero(st);
2656                 if (stat(u->fragment_path, &st) < 0)
2657                         /* What, cannot access this anymore? */
2658                         return true;
2659
2660                 if (u->fragment_mtime > 0 &&
2661                     timespec_load(&st.st_mtim) != u->fragment_mtime)
2662                         return true;
2663         }
2664
2665         if (u->source_path) {
2666                 zero(st);
2667                 if (stat(u->source_path, &st) < 0)
2668                         return true;
2669
2670                 if (u->source_mtime > 0 &&
2671                     timespec_load(&st.st_mtim) != u->source_mtime)
2672                         return true;
2673         }
2674
2675         return false;
2676 }
2677
2678 void unit_reset_failed(Unit *u) {
2679         assert(u);
2680
2681         if (UNIT_VTABLE(u)->reset_failed)
2682                 UNIT_VTABLE(u)->reset_failed(u);
2683 }
2684
2685 Unit *unit_following(Unit *u) {
2686         assert(u);
2687
2688         if (UNIT_VTABLE(u)->following)
2689                 return UNIT_VTABLE(u)->following(u);
2690
2691         return NULL;
2692 }
2693
2694 bool unit_pending_inactive(Unit *u) {
2695         assert(u);
2696
2697         /* Returns true if the unit is inactive or going down */
2698
2699         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2700                 return true;
2701
2702         if (u->job && u->job->type == JOB_STOP)
2703                 return true;
2704
2705         return false;
2706 }
2707
2708 bool unit_pending_active(Unit *u) {
2709         assert(u);
2710
2711         /* Returns true if the unit is active or going up */
2712
2713         if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2714                 return true;
2715
2716         if (u->job &&
2717             (u->job->type == JOB_START ||
2718              u->job->type == JOB_RELOAD_OR_START ||
2719              u->job->type == JOB_RESTART))
2720                 return true;
2721
2722         return false;
2723 }
2724
2725 int unit_kill(Unit *u, KillWho w, int signo, DBusError *error) {
2726         assert(u);
2727         assert(w >= 0 && w < _KILL_WHO_MAX);
2728         assert(signo > 0);
2729         assert(signo < _NSIG);
2730
2731         if (!UNIT_VTABLE(u)->kill)
2732                 return -ENOTSUP;
2733
2734         return UNIT_VTABLE(u)->kill(u, w, signo, error);
2735 }
2736
2737 int unit_following_set(Unit *u, Set **s) {
2738         assert(u);
2739         assert(s);
2740
2741         if (UNIT_VTABLE(u)->following_set)
2742                 return UNIT_VTABLE(u)->following_set(u, s);
2743
2744         *s = NULL;
2745         return 0;
2746 }
2747
2748 UnitFileState unit_get_unit_file_state(Unit *u) {
2749         assert(u);
2750
2751         if (u->unit_file_state < 0 && u->fragment_path)
2752                 u->unit_file_state = unit_file_get_state(
2753                                 u->manager->running_as == MANAGER_SYSTEM ? UNIT_FILE_SYSTEM : UNIT_FILE_USER,
2754                                 NULL, path_get_file_name(u->fragment_path));
2755
2756         return u->unit_file_state;
2757 }
2758
2759 Unit* unit_ref_set(UnitRef *ref, Unit *u) {
2760         assert(ref);
2761         assert(u);
2762
2763         if (ref->unit)
2764                 unit_ref_unset(ref);
2765
2766         ref->unit = u;
2767         LIST_PREPEND(UnitRef, refs, u->refs, ref);
2768         return u;
2769 }
2770
2771 void unit_ref_unset(UnitRef *ref) {
2772         assert(ref);
2773
2774         if (!ref->unit)
2775                 return;
2776
2777         LIST_REMOVE(UnitRef, refs, ref->unit->refs, ref);
2778         ref->unit = NULL;
2779 }
2780
2781 int unit_add_one_mount_link(Unit *u, Mount *m) {
2782         char **i;
2783
2784         assert(u);
2785         assert(m);
2786
2787         if (u->load_state != UNIT_LOADED ||
2788             UNIT(m)->load_state != UNIT_LOADED)
2789                 return 0;
2790
2791         STRV_FOREACH(i, u->requires_mounts_for) {
2792
2793                 if (UNIT(m) == u)
2794                         continue;
2795
2796                 if (!path_startswith(*i, m->where))
2797                         continue;
2798
2799                 return unit_add_two_dependencies(u, UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true);
2800         }
2801
2802         return 0;
2803 }
2804
2805 int unit_add_mount_links(Unit *u) {
2806         Unit *other;
2807         int r;
2808
2809         assert(u);
2810
2811         LIST_FOREACH(units_by_type, other, u->manager->units_by_type[UNIT_MOUNT]) {
2812                 r = unit_add_one_mount_link(u, MOUNT(other));
2813                 if (r < 0)
2814                         return r;
2815         }
2816
2817         return 0;
2818 }
2819
2820 int unit_exec_context_defaults(Unit *u, ExecContext *c) {
2821         unsigned i;
2822         int r;
2823
2824         assert(u);
2825         assert(c);
2826
2827         /* This only copies in the ones that need memory */
2828
2829         for (i = 0; i < RLIMIT_NLIMITS; i++)
2830                 if (u->manager->rlimit[i] && !c->rlimit[i]) {
2831                         c->rlimit[i] = newdup(struct rlimit, u->manager->rlimit[i], 1);
2832                         if (!c->rlimit[i])
2833                                 return -ENOMEM;
2834                 }
2835
2836         if (u->manager->running_as == MANAGER_USER &&
2837             !c->working_directory) {
2838
2839                 r = get_home_dir(&c->working_directory);
2840                 if (r < 0)
2841                         return r;
2842         }
2843
2844         return 0;
2845 }
2846
2847 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2848         [UNIT_ACTIVE] = "active",
2849         [UNIT_RELOADING] = "reloading",
2850         [UNIT_INACTIVE] = "inactive",
2851         [UNIT_FAILED] = "failed",
2852         [UNIT_ACTIVATING] = "activating",
2853         [UNIT_DEACTIVATING] = "deactivating"
2854 };
2855
2856 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2857
2858 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2859         [UNIT_REQUIRES] = "Requires",
2860         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2861         [UNIT_WANTS] = "Wants",
2862         [UNIT_REQUISITE] = "Requisite",
2863         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2864         [UNIT_REQUIRED_BY] = "RequiredBy",
2865         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2866         [UNIT_BINDS_TO] = "BindsTo",
2867         [UNIT_WANTED_BY] = "WantedBy",
2868         [UNIT_CONFLICTS] = "Conflicts",
2869         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2870         [UNIT_BOUND_BY] = "BoundBy",
2871         [UNIT_BEFORE] = "Before",
2872         [UNIT_AFTER] = "After",
2873         [UNIT_REFERENCES] = "References",
2874         [UNIT_REFERENCED_BY] = "ReferencedBy",
2875         [UNIT_ON_FAILURE] = "OnFailure",
2876         [UNIT_TRIGGERS] = "Triggers",
2877         [UNIT_TRIGGERED_BY] = "TriggeredBy",
2878         [UNIT_PROPAGATES_RELOAD_TO] = "PropagatesReloadTo",
2879         [UNIT_RELOAD_PROPAGATED_FROM] = "ReloadPropagatedFrom"
2880 };
2881
2882 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);