src/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 General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <assert.h>
  23 #include <errno.h>
  24 #include <string.h>
  25 #include <sys/epoll.h>
  26 #include <sys/timerfd.h>
  27 #include <sys/poll.h>
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30 #include <sys/stat.h>
  31
  32 #include "set.h"
  33 #include "unit.h"
  34 #include "macro.h"
  35 #include "strv.h"
  36 #include "load-fragment.h"
  37 #include "load-dropin.h"
  38 #include "log.h"
  39 #include "unit-name.h"
  40 #include "specifier.h"
  41 #include "dbus-unit.h"
  42 #include "special.h"
  43 #include "cgroup-util.h"
  44 #include "missing.h"
  45
  46 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
  47         [UNIT_SERVICE] = &service_vtable,
  48         [UNIT_TIMER] = &timer_vtable,
  49         [UNIT_SOCKET] = &socket_vtable,
  50         [UNIT_TARGET] = &target_vtable,
  51         [UNIT_DEVICE] = &device_vtable,
  52         [UNIT_MOUNT] = &mount_vtable,
  53         [UNIT_AUTOMOUNT] = &automount_vtable,
  54         [UNIT_SNAPSHOT] = &snapshot_vtable,
  55         [UNIT_SWAP] = &swap_vtable,
  56         [UNIT_PATH] = &path_vtable
  57 };
  58
  59 Unit *unit_new(Manager *m) {
  60         Unit *u;
  61
  62         assert(m);
  63
  64         if (!(u = new0(Unit, 1)))
  65                 return NULL;
  66
  67         if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
  68                 free(u);
  69                 return NULL;
  70         }
  71
  72         u->meta.manager = m;
  73         u->meta.type = _UNIT_TYPE_INVALID;
  74         u->meta.deserialized_job = _JOB_TYPE_INVALID;
  75         u->meta.default_dependencies = true;
  76
  77         return u;
  78 }
  79
  80 bool unit_has_name(Unit *u, const char *name) {
  81         assert(u);
  82         assert(name);
  83
  84         return !!set_get(u->meta.names, (char*) name);
  85 }
  86
  87 int unit_add_name(Unit *u, const char *text) {
  88         UnitType t;
  89         char *s, *i = NULL;
  90         int r;
  91
  92         assert(u);
  93         assert(text);
  94
  95         if (unit_name_is_template(text)) {
  96                 if (!u->meta.instance)
  97                         return -EINVAL;
  98
  99                 s = unit_name_replace_instance(text, u->meta.instance);
 100         } else
 101                 s = strdup(text);
 102
 103         if (!s)
 104                 return -ENOMEM;
 105
 106         if (!unit_name_is_valid(s, false)) {
 107                 r = -EINVAL;
 108                 goto fail;
 109         }
 110
 111         assert_se((t = unit_name_to_type(s)) >= 0);
 112
 113         if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
 114                 r = -EINVAL;
 115                 goto fail;
 116         }
 117
 118         if ((r = unit_name_to_instance(s, &i)) < 0)
 119                 goto fail;
 120
 121         if (i && unit_vtable[t]->no_instances) {
 122                 r = -EINVAL;
 123                 goto fail;
 124         }
 125
 126         /* Ensure that this unit is either instanced or not instanced,
 127          * but not both. */
 128         if (u->meta.type != _UNIT_TYPE_INVALID && !u->meta.instance != !i) {
 129                 r = -EINVAL;
 130                 goto fail;
 131         }
 132
 133         if (unit_vtable[t]->no_alias &&
 134             !set_isempty(u->meta.names) &&
 135             !set_get(u->meta.names, s)) {
 136                 r = -EEXIST;
 137                 goto fail;
 138         }
 139
 140         if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
 141                 r = -E2BIG;
 142                 goto fail;
 143         }
 144
 145         if ((r = set_put(u->meta.names, s)) < 0) {
 146                 if (r == -EEXIST)
 147                         r = 0;
 148                 goto fail;
 149         }
 150
 151         if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
 152                 set_remove(u->meta.names, s);
 153                 goto fail;
 154         }
 155
 156         if (u->meta.type == _UNIT_TYPE_INVALID) {
 157
 158                 u->meta.type = t;
 159                 u->meta.id = s;
 160                 u->meta.instance = i;
 161
 162                 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
 163
 164                 if (UNIT_VTABLE(u)->init)
 165                         UNIT_VTABLE(u)->init(u);
 166         } else
 167                 free(i);
 168
 169         unit_add_to_dbus_queue(u);
 170         return 0;
 171
 172 fail:
 173         free(s);
 174         free(i);
 175
 176         return r;
 177 }
 178
 179 int unit_choose_id(Unit *u, const char *name) {
 180         char *s, *t = NULL, *i;
 181         int r;
 182
 183         assert(u);
 184         assert(name);
 185
 186         if (unit_name_is_template(name)) {
 187
 188                 if (!u->meta.instance)
 189                         return -EINVAL;
 190
 191                 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
 192                         return -ENOMEM;
 193
 194                 name = t;
 195         }
 196
 197         /* Selects one of the names of this unit as the id */
 198         s = set_get(u->meta.names, (char*) name);
 199         free(t);
 200
 201         if (!s)
 202                 return -ENOENT;
 203
 204         if ((r = unit_name_to_instance(s, &i)) < 0)
 205                 return r;
 206
 207         u->meta.id = s;
 208
 209         free(u->meta.instance);
 210         u->meta.instance = i;
 211
 212         unit_add_to_dbus_queue(u);
 213
 214         return 0;
 215 }
 216
 217 int unit_set_description(Unit *u, const char *description) {
 218         char *s;
 219
 220         assert(u);
 221
 222         if (!(s = strdup(description)))
 223                 return -ENOMEM;
 224
 225         free(u->meta.description);
 226         u->meta.description = s;
 227
 228         unit_add_to_dbus_queue(u);
 229         return 0;
 230 }
 231
 232 bool unit_check_gc(Unit *u) {
 233         assert(u);
 234
 235         if (u->meta.load_state == UNIT_STUB)
 236                 return true;
 237
 238         if (UNIT_VTABLE(u)->no_gc)
 239                 return true;
 240
 241         if (u->meta.no_gc)
 242                 return true;
 243
 244         if (u->meta.job)
 245                 return true;
 246
 247         if (unit_active_state(u) != UNIT_INACTIVE)
 248                 return true;
 249
 250         if (UNIT_VTABLE(u)->check_gc)
 251                 if (UNIT_VTABLE(u)->check_gc(u))
 252                         return true;
 253
 254         return false;
 255 }
 256
 257 void unit_add_to_load_queue(Unit *u) {
 258         assert(u);
 259         assert(u->meta.type != _UNIT_TYPE_INVALID);
 260
 261         if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
 262                 return;
 263
 264         LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 265         u->meta.in_load_queue = true;
 266 }
 267
 268 void unit_add_to_cleanup_queue(Unit *u) {
 269         assert(u);
 270
 271         if (u->meta.in_cleanup_queue)
 272                 return;
 273
 274         LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 275         u->meta.in_cleanup_queue = true;
 276 }
 277
 278 void unit_add_to_gc_queue(Unit *u) {
 279         assert(u);
 280
 281         if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
 282                 return;
 283
 284         if (unit_check_gc(u))
 285                 return;
 286
 287         LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 288         u->meta.in_gc_queue = true;
 289
 290         u->meta.manager->n_in_gc_queue ++;
 291
 292         if (u->meta.manager->gc_queue_timestamp <= 0)
 293                 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
 294 }
 295
 296 void unit_add_to_dbus_queue(Unit *u) {
 297         assert(u);
 298         assert(u->meta.type != _UNIT_TYPE_INVALID);
 299
 300         if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
 301                 return;
 302
 303         /* Shortcut things if nobody cares */
 304         if (!bus_has_subscriber(u->meta.manager)) {
 305                 u->meta.sent_dbus_new_signal = true;
 306                 return;
 307         }
 308
 309         LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 310         u->meta.in_dbus_queue = true;
 311 }
 312
 313 static void bidi_set_free(Unit *u, Set *s) {
 314         Iterator i;
 315         Unit *other;
 316
 317         assert(u);
 318
 319         /* Frees the set and makes sure we are dropped from the
 320          * inverse pointers */
 321
 322         SET_FOREACH(other, s, i) {
 323                 UnitDependency d;
 324
 325                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 326                         set_remove(other->meta.dependencies[d], u);
 327
 328                 unit_add_to_gc_queue(other);
 329         }
 330
 331         set_free(s);
 332 }
 333
 334 void unit_free(Unit *u) {
 335         UnitDependency d;
 336         Iterator i;
 337         char *t;
 338
 339         assert(u);
 340
 341         bus_unit_send_removed_signal(u);
 342
 343         if (u->meta.load_state != UNIT_STUB)
 344                 if (UNIT_VTABLE(u)->done)
 345                         UNIT_VTABLE(u)->done(u);
 346
 347         SET_FOREACH(t, u->meta.names, i)
 348                 hashmap_remove_value(u->meta.manager->units, t, u);
 349
 350         if (u->meta.job)
 351                 job_free(u->meta.job);
 352
 353         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 354                 bidi_set_free(u, u->meta.dependencies[d]);
 355
 356         if (u->meta.type != _UNIT_TYPE_INVALID)
 357                 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
 358
 359         if (u->meta.in_load_queue)
 360                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 361
 362         if (u->meta.in_dbus_queue)
 363                 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 364
 365         if (u->meta.in_cleanup_queue)
 366                 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 367
 368         if (u->meta.in_gc_queue) {
 369                 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 370                 u->meta.manager->n_in_gc_queue--;
 371         }
 372
 373         cgroup_bonding_free_list(u->meta.cgroup_bondings, u->meta.manager->n_serializing <= 0);
 374
 375         free(u->meta.description);
 376         free(u->meta.fragment_path);
 377
 378         set_free_free(u->meta.names);
 379
 380         condition_free_list(u->meta.conditions);
 381
 382         free(u->meta.instance);
 383         free(u);
 384 }
 385
 386 UnitActiveState unit_active_state(Unit *u) {
 387         assert(u);
 388
 389         if (u->meta.load_state == UNIT_MERGED)
 390                 return unit_active_state(unit_follow_merge(u));
 391
 392         /* After a reload it might happen that a unit is not correctly
 393          * loaded but still has a process around. That's why we won't
 394          * shortcut failed loading to UNIT_INACTIVE_FAILED. */
 395
 396         return UNIT_VTABLE(u)->active_state(u);
 397 }
 398
 399 const char* unit_sub_state_to_string(Unit *u) {
 400         assert(u);
 401
 402         return UNIT_VTABLE(u)->sub_state_to_string(u);
 403 }
 404
 405 static void complete_move(Set **s, Set **other) {
 406         assert(s);
 407         assert(other);
 408
 409         if (!*other)
 410                 return;
 411
 412         if (*s)
 413                 set_move(*s, *other);
 414         else {
 415                 *s = *other;
 416                 *other = NULL;
 417         }
 418 }
 419
 420 static void merge_names(Unit *u, Unit *other) {
 421         char *t;
 422         Iterator i;
 423
 424         assert(u);
 425         assert(other);
 426
 427         complete_move(&u->meta.names, &other->meta.names);
 428
 429         set_free_free(other->meta.names);
 430         other->meta.names = NULL;
 431         other->meta.id = NULL;
 432
 433         SET_FOREACH(t, u->meta.names, i)
 434                 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
 435 }
 436
 437 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
 438         Iterator i;
 439         Unit *back;
 440         int r;
 441
 442         assert(u);
 443         assert(other);
 444         assert(d < _UNIT_DEPENDENCY_MAX);
 445
 446         /* Fix backwards pointers */
 447         SET_FOREACH(back, other->meta.dependencies[d], i) {
 448                 UnitDependency k;
 449
 450                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
 451                         if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
 452
 453                                 if (r == -EEXIST)
 454                                         set_remove(back->meta.dependencies[k], other);
 455                                 else
 456                                         assert(r == -ENOENT);
 457                         }
 458         }
 459
 460         complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
 461
 462         set_free(other->meta.dependencies[d]);
 463         other->meta.dependencies[d] = NULL;
 464 }
 465
 466 int unit_merge(Unit *u, Unit *other) {
 467         UnitDependency d;
 468
 469         assert(u);
 470         assert(other);
 471         assert(u->meta.manager == other->meta.manager);
 472         assert(u->meta.type != _UNIT_TYPE_INVALID);
 473
 474         other = unit_follow_merge(other);
 475
 476         if (other == u)
 477                 return 0;
 478
 479         if (u->meta.type != other->meta.type)
 480                 return -EINVAL;
 481
 482         if (!u->meta.instance != !other->meta.instance)
 483                 return -EINVAL;
 484
 485         if (other->meta.load_state != UNIT_STUB &&
 486             other->meta.load_state != UNIT_ERROR)
 487                 return -EEXIST;
 488
 489         if (other->meta.job)
 490                 return -EEXIST;
 491
 492         if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
 493                 return -EEXIST;
 494
 495         /* Merge names */
 496         merge_names(u, other);
 497
 498         /* Merge dependencies */
 499         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 500                 merge_dependencies(u, other, d);
 501
 502         other->meta.load_state = UNIT_MERGED;
 503         other->meta.merged_into = u;
 504
 505         /* If there is still some data attached to the other node, we
 506          * don't need it anymore, and can free it. */
 507         if (other->meta.load_state != UNIT_STUB)
 508                 if (UNIT_VTABLE(other)->done)
 509                         UNIT_VTABLE(other)->done(other);
 510
 511         unit_add_to_dbus_queue(u);
 512         unit_add_to_cleanup_queue(other);
 513
 514         return 0;
 515 }
 516
 517 int unit_merge_by_name(Unit *u, const char *name) {
 518         Unit *other;
 519         int r;
 520         char *s = NULL;
 521
 522         assert(u);
 523         assert(name);
 524
 525         if (unit_name_is_template(name)) {
 526                 if (!u->meta.instance)
 527                         return -EINVAL;
 528
 529                 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
 530                         return -ENOMEM;
 531
 532                 name = s;
 533         }
 534
 535         if (!(other = manager_get_unit(u->meta.manager, name)))
 536                 r = unit_add_name(u, name);
 537         else
 538                 r = unit_merge(u, other);
 539
 540         free(s);
 541         return r;
 542 }
 543
 544 Unit* unit_follow_merge(Unit *u) {
 545         assert(u);
 546
 547         while (u->meta.load_state == UNIT_MERGED)
 548                 assert_se(u = u->meta.merged_into);
 549
 550         return u;
 551 }
 552
 553 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
 554         int r;
 555
 556         assert(u);
 557         assert(c);
 558
 559         if (c->std_output != EXEC_OUTPUT_KMSG &&
 560             c->std_output != EXEC_OUTPUT_SYSLOG &&
 561             c->std_output != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
 562             c->std_output != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
 563             c->std_error != EXEC_OUTPUT_KMSG &&
 564             c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
 565             c->std_error != EXEC_OUTPUT_KMSG &&
 566             c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE)
 567                 return 0;
 568
 569         /* If syslog or kernel logging is requested, make sure our own
 570          * logging daemon is run first. */
 571
 572         if (u->meta.manager->running_as == MANAGER_SYSTEM)
 573                 if ((r = unit_add_two_dependencies_by_name(u, UNIT_REQUIRES, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
 574                         return r;
 575
 576         return 0;
 577 }
 578
 579 const char *unit_description(Unit *u) {
 580         assert(u);
 581
 582         if (u->meta.description)
 583                 return u->meta.description;
 584
 585         return strna(u->meta.id);
 586 }
 587
 588 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 589         char *t;
 590         UnitDependency d;
 591         Iterator i;
 592         char *p2;
 593         const char *prefix2;
 594         CGroupBonding *b;
 595         char
 596                 timestamp1[FORMAT_TIMESTAMP_MAX],
 597                 timestamp2[FORMAT_TIMESTAMP_MAX],
 598                 timestamp3[FORMAT_TIMESTAMP_MAX],
 599                 timestamp4[FORMAT_TIMESTAMP_MAX],
 600                 timespan[FORMAT_TIMESPAN_MAX];
 601         Unit *following;
 602
 603         assert(u);
 604         assert(u->meta.type >= 0);
 605
 606         if (!prefix)
 607                 prefix = "";
 608         p2 = strappend(prefix, "\t");
 609         prefix2 = p2 ? p2 : prefix;
 610
 611         fprintf(f,
 612                 "%s-> Unit %s:\n"
 613                 "%s\tDescription: %s\n"
 614                 "%s\tInstance: %s\n"
 615                 "%s\tUnit Load State: %s\n"
 616                 "%s\tUnit Active State: %s\n"
 617                 "%s\tInactive Exit Timestamp: %s\n"
 618                 "%s\tActive Enter Timestamp: %s\n"
 619                 "%s\tActive Exit Timestamp: %s\n"
 620                 "%s\tInactive Enter Timestamp: %s\n"
 621                 "%s\tGC Check Good: %s\n"
 622                 "%s\tNeed Daemon Reload: %s\n",
 623                 prefix, u->meta.id,
 624                 prefix, unit_description(u),
 625                 prefix, strna(u->meta.instance),
 626                 prefix, unit_load_state_to_string(u->meta.load_state),
 627                 prefix, unit_active_state_to_string(unit_active_state(u)),
 628                 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
 629                 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
 630                 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
 631                 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
 632                 prefix, yes_no(unit_check_gc(u)),
 633                 prefix, yes_no(unit_need_daemon_reload(u)));
 634
 635         SET_FOREACH(t, u->meta.names, i)
 636                 fprintf(f, "%s\tName: %s\n", prefix, t);
 637
 638         if ((following = unit_following(u)))
 639                 fprintf(f, "%s\tFollowing: %s\n", prefix, following->meta.id);
 640
 641         if (u->meta.fragment_path)
 642                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
 643
 644         if (u->meta.job_timeout > 0)
 645                 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->meta.job_timeout));
 646
 647         condition_dump_list(u->meta.conditions, f, prefix);
 648
 649         if (dual_timestamp_is_set(&u->meta.condition_timestamp))
 650                 fprintf(f,
 651                         "%s\tCondition Timestamp: %s\n"
 652                         "%s\tCondition Result: %s\n",
 653                         prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.condition_timestamp.realtime)),
 654                         prefix, yes_no(u->meta.condition_result));
 655
 656         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 657                 Unit *other;
 658
 659                 SET_FOREACH(other, u->meta.dependencies[d], i)
 660                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
 661         }
 662
 663         if (u->meta.load_state == UNIT_LOADED) {
 664                 fprintf(f,
 665                         "%s\tStopWhenUnneeded: %s\n"
 666                         "%s\tRefuseManualStart: %s\n"
 667                         "%s\tRefuseManualStop: %s\n"
 668                         "%s\tDefaultDependencies: %s\n"
 669                         "%s\tOnFailureIsolate: %s\n"
 670                         "%s\tIgnoreOnIsolate: %s\n",
 671                         prefix, yes_no(u->meta.stop_when_unneeded),
 672                         prefix, yes_no(u->meta.refuse_manual_start),
 673                         prefix, yes_no(u->meta.refuse_manual_stop),
 674                         prefix, yes_no(u->meta.default_dependencies),
 675                         prefix, yes_no(u->meta.on_failure_isolate),
 676                         prefix, yes_no(u->meta.ignore_on_isolate));
 677
 678                 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
 679                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 680                                 prefix, b->controller, b->path);
 681
 682                 if (UNIT_VTABLE(u)->dump)
 683                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 684
 685         } else if (u->meta.load_state == UNIT_MERGED)
 686                 fprintf(f,
 687                         "%s\tMerged into: %s\n",
 688                         prefix, u->meta.merged_into->meta.id);
 689         else if (u->meta.load_state == UNIT_ERROR)
 690                 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->meta.load_error));
 691
 692
 693         if (u->meta.job)
 694                 job_dump(u->meta.job, f, prefix2);
 695
 696         free(p2);
 697 }
 698
 699 /* Common implementation for multiple backends */
 700 int unit_load_fragment_and_dropin(Unit *u) {
 701         int r;
 702
 703         assert(u);
 704
 705         /* Load a .service file */
 706         if ((r = unit_load_fragment(u)) < 0)
 707                 return r;
 708
 709         if (u->meta.load_state == UNIT_STUB)
 710                 return -ENOENT;
 711
 712         /* Load drop-in directory data */
 713         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 714                 return r;
 715
 716         return 0;
 717 }
 718
 719 /* Common implementation for multiple backends */
 720 int unit_load_fragment_and_dropin_optional(Unit *u) {
 721         int r;
 722
 723         assert(u);
 724
 725         /* Same as unit_load_fragment_and_dropin(), but whether
 726          * something can be loaded or not doesn't matter. */
 727
 728         /* Load a .service file */
 729         if ((r = unit_load_fragment(u)) < 0)
 730                 return r;
 731
 732         if (u->meta.load_state == UNIT_STUB)
 733                 u->meta.load_state = UNIT_LOADED;
 734
 735         /* Load drop-in directory data */
 736         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 737                 return r;
 738
 739         return 0;
 740 }
 741
 742 int unit_add_default_target_dependency(Unit *u, Unit *target) {
 743         assert(u);
 744         assert(target);
 745
 746         if (target->meta.type != UNIT_TARGET)
 747                 return 0;
 748
 749         /* Only add the dependency if both units are loaded, so that
 750          * that loop check below is reliable */
 751         if (u->meta.load_state != UNIT_LOADED ||
 752             target->meta.load_state != UNIT_LOADED)
 753                 return 0;
 754
 755         /* If either side wants no automatic dependencies, then let's
 756          * skip this */
 757         if (!u->meta.default_dependencies ||
 758             target->meta.default_dependencies)
 759                 return 0;
 760
 761         /* Don't create loops */
 762         if (set_get(target->meta.dependencies[UNIT_BEFORE], u))
 763                 return 0;
 764
 765         return unit_add_dependency(target, UNIT_AFTER, u, true);
 766 }
 767
 768 static int unit_add_default_dependencies(Unit *u) {
 769         static const UnitDependency deps[] = {
 770                 UNIT_REQUIRED_BY,
 771                 UNIT_REQUIRED_BY_OVERRIDABLE,
 772                 UNIT_WANTED_BY,
 773                 UNIT_BOUND_BY
 774         };
 775
 776         Unit *target;
 777         Iterator i;
 778         int r;
 779         unsigned k;
 780
 781         assert(u);
 782
 783         for (k = 0; k < ELEMENTSOF(deps); k++)
 784                 SET_FOREACH(target, u->meta.dependencies[deps[k]], i)
 785                         if ((r = unit_add_default_target_dependency(u, target)) < 0)
 786                                 return r;
 787
 788         return 0;
 789 }
 790
 791 int unit_load(Unit *u) {
 792         int r;
 793
 794         assert(u);
 795
 796         if (u->meta.in_load_queue) {
 797                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 798                 u->meta.in_load_queue = false;
 799         }
 800
 801         if (u->meta.type == _UNIT_TYPE_INVALID)
 802                 return -EINVAL;
 803
 804         if (u->meta.load_state != UNIT_STUB)
 805                 return 0;
 806
 807         if (UNIT_VTABLE(u)->load)
 808                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 809                         goto fail;
 810
 811         if (u->meta.load_state == UNIT_STUB) {
 812                 r = -ENOENT;
 813                 goto fail;
 814         }
 815
 816         if (u->meta.load_state == UNIT_LOADED &&
 817             u->meta.default_dependencies)
 818                 if ((r = unit_add_default_dependencies(u)) < 0)
 819                         goto fail;
 820
 821         if (u->meta.on_failure_isolate &&
 822             set_size(u->meta.dependencies[UNIT_ON_FAILURE]) > 1) {
 823
 824                 log_error("More than one OnFailure= dependencies specified for %s but OnFailureIsolate= enabled. Refusing.",
 825                           u->meta.id);
 826
 827                 r = -EINVAL;
 828                 goto fail;
 829         }
 830
 831         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 832
 833         unit_add_to_dbus_queue(unit_follow_merge(u));
 834         unit_add_to_gc_queue(u);
 835
 836         return 0;
 837
 838 fail:
 839         u->meta.load_state = UNIT_ERROR;
 840         u->meta.load_error = r;
 841         unit_add_to_dbus_queue(u);
 842
 843         log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
 844
 845         return r;
 846 }
 847
 848 bool unit_condition_test(Unit *u) {
 849         assert(u);
 850
 851         dual_timestamp_get(&u->meta.condition_timestamp);
 852         u->meta.condition_result = condition_test_list(u->meta.conditions);
 853
 854         return u->meta.condition_result;
 855 }
 856
 857 /* Errors:
 858  *         -EBADR:     This unit type does not support starting.
 859  *         -EALREADY:  Unit is already started.
 860  *         -EAGAIN:    An operation is already in progress. Retry later.
 861  *         -ECANCELED: Too many requests for now.
 862  */
 863 int unit_start(Unit *u) {
 864         UnitActiveState state;
 865         Unit *following;
 866
 867         assert(u);
 868
 869         if (u->meta.load_state != UNIT_LOADED)
 870                 return -EINVAL;
 871
 872         /* If this is already (being) started, then this will
 873          * succeed. Note that this will even succeed if this unit is
 874          * not startable by the user. This is relied on to detect when
 875          * we need to wait for units and when waiting is finished. */
 876         state = unit_active_state(u);
 877         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 878                 return -EALREADY;
 879
 880         /* If the conditions failed, don't do anything at all */
 881         if (!unit_condition_test(u)) {
 882                 log_debug("Starting of %s requested but condition failed. Ignoring.", u->meta.id);
 883                 return -EALREADY;
 884         }
 885
 886         /* Forward to the main object, if we aren't it. */
 887         if ((following = unit_following(u))) {
 888                 log_debug("Redirecting start request from %s to %s.", u->meta.id, following->meta.id);
 889                 return unit_start(following);
 890         }
 891
 892         /* If it is stopped, but we cannot start it, then fail */
 893         if (!UNIT_VTABLE(u)->start)
 894                 return -EBADR;
 895
 896         /* We don't suppress calls to ->start() here when we are
 897          * already starting, to allow this request to be used as a
 898          * "hurry up" call, for example when the unit is in some "auto
 899          * restart" state where it waits for a holdoff timer to elapse
 900          * before it will start again. */
 901
 902         unit_add_to_dbus_queue(u);
 903
 904         unit_status_printf(u, "Starting %s...\n", unit_description(u));
 905         return UNIT_VTABLE(u)->start(u);
 906 }
 907
 908 bool unit_can_start(Unit *u) {
 909         assert(u);
 910
 911         return !!UNIT_VTABLE(u)->start;
 912 }
 913
 914 bool unit_can_isolate(Unit *u) {
 915         assert(u);
 916
 917         return unit_can_start(u) &&
 918                 u->meta.allow_isolate;
 919 }
 920
 921 /* Errors:
 922  *         -EBADR:    This unit type does not support stopping.
 923  *         -EALREADY: Unit is already stopped.
 924  *         -EAGAIN:   An operation is already in progress. Retry later.
 925  */
 926 int unit_stop(Unit *u) {
 927         UnitActiveState state;
 928         Unit *following;
 929
 930         assert(u);
 931
 932         state = unit_active_state(u);
 933         if (UNIT_IS_INACTIVE_OR_FAILED(state))
 934                 return -EALREADY;
 935
 936         if ((following = unit_following(u))) {
 937                 log_debug("Redirecting stop request from %s to %s.", u->meta.id, following->meta.id);
 938                 return unit_stop(following);
 939         }
 940
 941         if (!UNIT_VTABLE(u)->stop)
 942                 return -EBADR;
 943
 944         unit_add_to_dbus_queue(u);
 945
 946         unit_status_printf(u, "Stopping %s...\n", unit_description(u));
 947         return UNIT_VTABLE(u)->stop(u);
 948 }
 949
 950 /* Errors:
 951  *         -EBADR:    This unit type does not support reloading.
 952  *         -ENOEXEC:  Unit is not started.
 953  *         -EAGAIN:   An operation is already in progress. Retry later.
 954  */
 955 int unit_reload(Unit *u) {
 956         UnitActiveState state;
 957         Unit *following;
 958
 959         assert(u);
 960
 961         if (u->meta.load_state != UNIT_LOADED)
 962                 return -EINVAL;
 963
 964         if (!unit_can_reload(u))
 965                 return -EBADR;
 966
 967         state = unit_active_state(u);
 968         if (state == UNIT_RELOADING)
 969                 return -EALREADY;
 970
 971         if (state != UNIT_ACTIVE)
 972                 return -ENOEXEC;
 973
 974         if ((following = unit_following(u))) {
 975                 log_debug("Redirecting reload request from %s to %s.", u->meta.id, following->meta.id);
 976                 return unit_reload(following);
 977         }
 978
 979         unit_add_to_dbus_queue(u);
 980         return UNIT_VTABLE(u)->reload(u);
 981 }
 982
 983 bool unit_can_reload(Unit *u) {
 984         assert(u);
 985
 986         if (!UNIT_VTABLE(u)->reload)
 987                 return false;
 988
 989         if (!UNIT_VTABLE(u)->can_reload)
 990                 return true;
 991
 992         return UNIT_VTABLE(u)->can_reload(u);
 993 }
 994
 995 static void unit_check_unneeded(Unit *u) {
 996         Iterator i;
 997         Unit *other;
 998
 999         assert(u);
1000
1001         /* If this service shall be shut down when unneeded then do
1002          * so. */
1003
1004         if (!u->meta.stop_when_unneeded)
1005                 return;
1006
1007         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
1008                 return;
1009
1010         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
1011                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1012                         return;
1013
1014         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
1015                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1016                         return;
1017
1018         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
1019                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1020                         return;
1021
1022         SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1023                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1024                         return;
1025
1026         log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
1027
1028         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1029         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
1030 }
1031
1032 static void retroactively_start_dependencies(Unit *u) {
1033         Iterator i;
1034         Unit *other;
1035
1036         assert(u);
1037         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
1038
1039         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1040                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1041                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1042                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1043
1044         SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1045                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1046                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1047                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1048
1049         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1050                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1051                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1052                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1053
1054         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1055                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1056                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1057                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1058
1059         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1060                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1061                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1062                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1063
1064         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
1065                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1066                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1067
1068         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
1069                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1070                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1071 }
1072
1073 static void retroactively_stop_dependencies(Unit *u) {
1074         Iterator i;
1075         Unit *other;
1076
1077         assert(u);
1078         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1079
1080         /* Pull down units which are bound to us recursively if enabled */
1081         SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1082                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1083                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1084
1085         /* Garbage collect services that might not be needed anymore, if enabled */
1086         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1087                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1088                         unit_check_unneeded(other);
1089         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1090                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1091                         unit_check_unneeded(other);
1092         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1093                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1094                         unit_check_unneeded(other);
1095         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1096                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1097                         unit_check_unneeded(other);
1098         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1099                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1100                         unit_check_unneeded(other);
1101         SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1102                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1103                         unit_check_unneeded(other);
1104 }
1105
1106 void unit_trigger_on_failure(Unit *u) {
1107         Unit *other;
1108         Iterator i;
1109
1110         assert(u);
1111
1112         if (set_size(u->meta.dependencies[UNIT_ON_FAILURE]) <= 0)
1113                 return;
1114
1115         log_info("Triggering OnFailure= dependencies of %s.", u->meta.id);
1116
1117         SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i) {
1118                 int r;
1119
1120                 if ((r = manager_add_job(u->meta.manager, JOB_START, other, u->meta.on_failure_isolate ? JOB_ISOLATE : JOB_REPLACE, true, NULL, NULL)) < 0)
1121                         log_error("Failed to enqueue OnFailure= job: %s", strerror(-r));
1122         }
1123 }
1124
1125 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) {
1126         bool unexpected;
1127
1128         assert(u);
1129         assert(os < _UNIT_ACTIVE_STATE_MAX);
1130         assert(ns < _UNIT_ACTIVE_STATE_MAX);
1131
1132         /* Note that this is called for all low-level state changes,
1133          * even if they might map to the same high-level
1134          * UnitActiveState! That means that ns == os is OK an expected
1135          * behaviour here. For example: if a mount point is remounted
1136          * this function will be called too! */
1137
1138         if (u->meta.manager->n_deserializing <= 0) {
1139                 dual_timestamp ts;
1140
1141                 dual_timestamp_get(&ts);
1142
1143                 if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1144                         u->meta.inactive_exit_timestamp = ts;
1145                 else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1146                         u->meta.inactive_enter_timestamp = ts;
1147
1148                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1149                         u->meta.active_enter_timestamp = ts;
1150                 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1151                         u->meta.active_exit_timestamp = ts;
1152
1153                 timer_unit_notify(u, ns);
1154                 path_unit_notify(u, ns);
1155         }
1156
1157         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1158                 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1159
1160         if (u->meta.job) {
1161                 unexpected = false;
1162
1163                 if (u->meta.job->state == JOB_WAITING)
1164
1165                         /* So we reached a different state for this
1166                          * job. Let's see if we can run it now if it
1167                          * failed previously due to EAGAIN. */
1168                         job_add_to_run_queue(u->meta.job);
1169
1170                 /* Let's check whether this state change constitutes a
1171                  * finished job, or maybe contradicts a running job and
1172                  * hence needs to invalidate jobs. */
1173
1174                 switch (u->meta.job->type) {
1175
1176                 case JOB_START:
1177                 case JOB_VERIFY_ACTIVE:
1178
1179                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1180                                 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1181                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1182                                 unexpected = true;
1183
1184                                 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1185                                         job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1186                         }
1187
1188                         break;
1189
1190                 case JOB_RELOAD:
1191                 case JOB_RELOAD_OR_START:
1192
1193                         if (u->meta.job->state == JOB_RUNNING) {
1194                                 if (ns == UNIT_ACTIVE)
1195                                         job_finish_and_invalidate(u->meta.job, reload_success ? JOB_DONE : JOB_FAILED);
1196                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1197                                         unexpected = true;
1198
1199                                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1200                                                 job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1201                                 }
1202                         }
1203
1204                         break;
1205
1206                 case JOB_STOP:
1207                 case JOB_RESTART:
1208                 case JOB_TRY_RESTART:
1209
1210                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1211                                 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1212                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1213                                 unexpected = true;
1214                                 job_finish_and_invalidate(u->meta.job, JOB_FAILED);
1215                         }
1216
1217                         break;
1218
1219                 default:
1220                         assert_not_reached("Job type unknown");
1221                 }
1222
1223         } else
1224                 unexpected = true;
1225
1226         if (u->meta.manager->n_deserializing <= 0) {
1227
1228                 /* If this state change happened without being
1229                  * requested by a job, then let's retroactively start
1230                  * or stop dependencies. We skip that step when
1231                  * deserializing, since we don't want to create any
1232                  * additional jobs just because something is already
1233                  * activated. */
1234
1235                 if (unexpected) {
1236                         if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1237                                 retroactively_start_dependencies(u);
1238                         else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1239                                 retroactively_stop_dependencies(u);
1240                 }
1241
1242                 if (ns != os && ns == UNIT_FAILED) {
1243                         log_notice("Unit %s entered failed state.", u->meta.id);
1244                         unit_trigger_on_failure(u);
1245                 }
1246         }
1247
1248         /* Some names are special */
1249         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1250
1251                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1252                         /* The bus just might have become available,
1253                          * hence try to connect to it, if we aren't
1254                          * yet connected. */
1255                         bus_init(u->meta.manager, true);
1256
1257                 if (u->meta.type == UNIT_SERVICE &&
1258                     !UNIT_IS_ACTIVE_OR_RELOADING(os) &&
1259                     u->meta.manager->n_deserializing <= 0) {
1260                         /* Write audit record if we have just finished starting up */
1261                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, true);
1262                         u->meta.in_audit = true;
1263                 }
1264
1265                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1266                         manager_send_unit_plymouth(u->meta.manager, u);
1267
1268         } else {
1269
1270                 /* We don't care about D-Bus here, since we'll get an
1271                  * asynchronous notification for it anyway. */
1272
1273                 if (u->meta.type == UNIT_SERVICE &&
1274                     UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1275                     !UNIT_IS_INACTIVE_OR_FAILED(os) &&
1276                     u->meta.manager->n_deserializing <= 0) {
1277
1278                         /* Hmm, if there was no start record written
1279                          * write it now, so that we always have a nice
1280                          * pair */
1281                         if (!u->meta.in_audit) {
1282                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1283
1284                                 if (ns == UNIT_INACTIVE)
1285                                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1286                         } else
1287                                 /* Write audit record if we have just finished shutting down */
1288                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1289
1290                         u->meta.in_audit = false;
1291                 }
1292         }
1293
1294         manager_recheck_syslog(u->meta.manager);
1295
1296         /* Maybe we finished startup and are now ready for being
1297          * stopped because unneeded? */
1298         unit_check_unneeded(u);
1299
1300         unit_add_to_dbus_queue(u);
1301         unit_add_to_gc_queue(u);
1302 }
1303
1304 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1305         struct epoll_event ev;
1306
1307         assert(u);
1308         assert(fd >= 0);
1309         assert(w);
1310         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1311
1312         zero(ev);
1313         ev.data.ptr = w;
1314         ev.events = events;
1315
1316         if (epoll_ctl(u->meta.manager->epoll_fd,
1317                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1318                       fd,
1319                       &ev) < 0)
1320                 return -errno;
1321
1322         w->fd = fd;
1323         w->type = WATCH_FD;
1324         w->data.unit = u;
1325
1326         return 0;
1327 }
1328
1329 void unit_unwatch_fd(Unit *u, Watch *w) {
1330         assert(u);
1331         assert(w);
1332
1333         if (w->type == WATCH_INVALID)
1334                 return;
1335
1336         assert(w->type == WATCH_FD);
1337         assert(w->data.unit == u);
1338         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1339
1340         w->fd = -1;
1341         w->type = WATCH_INVALID;
1342         w->data.unit = NULL;
1343 }
1344
1345 int unit_watch_pid(Unit *u, pid_t pid) {
1346         assert(u);
1347         assert(pid >= 1);
1348
1349         /* Watch a specific PID. We only support one unit watching
1350          * each PID for now. */
1351
1352         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1353 }
1354
1355 void unit_unwatch_pid(Unit *u, pid_t pid) {
1356         assert(u);
1357         assert(pid >= 1);
1358
1359         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1360 }
1361
1362 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1363         struct itimerspec its;
1364         int flags, fd;
1365         bool ours;
1366
1367         assert(u);
1368         assert(w);
1369         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1370
1371         /* This will try to reuse the old timer if there is one */
1372
1373         if (w->type == WATCH_UNIT_TIMER) {
1374                 assert(w->data.unit == u);
1375                 assert(w->fd >= 0);
1376
1377                 ours = false;
1378                 fd = w->fd;
1379         } else if (w->type == WATCH_INVALID) {
1380
1381                 ours = true;
1382                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1383                         return -errno;
1384         } else
1385                 assert_not_reached("Invalid watch type");
1386
1387         zero(its);
1388
1389         if (delay <= 0) {
1390                 /* Set absolute time in the past, but not 0, since we
1391                  * don't want to disarm the timer */
1392                 its.it_value.tv_sec = 0;
1393                 its.it_value.tv_nsec = 1;
1394
1395                 flags = TFD_TIMER_ABSTIME;
1396         } else {
1397                 timespec_store(&its.it_value, delay);
1398                 flags = 0;
1399         }
1400
1401         /* This will also flush the elapse counter */
1402         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1403                 goto fail;
1404
1405         if (w->type == WATCH_INVALID) {
1406                 struct epoll_event ev;
1407
1408                 zero(ev);
1409                 ev.data.ptr = w;
1410                 ev.events = EPOLLIN;
1411
1412                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1413                         goto fail;
1414         }
1415
1416         w->type = WATCH_UNIT_TIMER;
1417         w->fd = fd;
1418         w->data.unit = u;
1419
1420         return 0;
1421
1422 fail:
1423         if (ours)
1424                 close_nointr_nofail(fd);
1425
1426         return -errno;
1427 }
1428
1429 void unit_unwatch_timer(Unit *u, Watch *w) {
1430         assert(u);
1431         assert(w);
1432
1433         if (w->type == WATCH_INVALID)
1434                 return;
1435
1436         assert(w->type == WATCH_UNIT_TIMER);
1437         assert(w->data.unit == u);
1438         assert(w->fd >= 0);
1439
1440         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1441         close_nointr_nofail(w->fd);
1442
1443         w->fd = -1;
1444         w->type = WATCH_INVALID;
1445         w->data.unit = NULL;
1446 }
1447
1448 bool unit_job_is_applicable(Unit *u, JobType j) {
1449         assert(u);
1450         assert(j >= 0 && j < _JOB_TYPE_MAX);
1451
1452         switch (j) {
1453
1454         case JOB_VERIFY_ACTIVE:
1455         case JOB_START:
1456         case JOB_STOP:
1457                 return true;
1458
1459         case JOB_RESTART:
1460         case JOB_TRY_RESTART:
1461                 return unit_can_start(u);
1462
1463         case JOB_RELOAD:
1464                 return unit_can_reload(u);
1465
1466         case JOB_RELOAD_OR_START:
1467                 return unit_can_reload(u) && unit_can_start(u);
1468
1469         default:
1470                 assert_not_reached("Invalid job type");
1471         }
1472 }
1473
1474 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1475
1476         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1477                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1478                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1479                 [UNIT_WANTS] = UNIT_WANTED_BY,
1480                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1481                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1482                 [UNIT_BIND_TO] = UNIT_BOUND_BY,
1483                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1484                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1485                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1486                 [UNIT_BOUND_BY] = UNIT_BIND_TO,
1487                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1488                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1489                 [UNIT_BEFORE] = UNIT_AFTER,
1490                 [UNIT_AFTER] = UNIT_BEFORE,
1491                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1492                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1493                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1494         };
1495         int r, q = 0, v = 0, w = 0;
1496
1497         assert(u);
1498         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1499         assert(other);
1500
1501         u = unit_follow_merge(u);
1502         other = unit_follow_merge(other);
1503
1504         /* We won't allow dependencies on ourselves. We will not
1505          * consider them an error however. */
1506         if (u == other)
1507                 return 0;
1508
1509         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1510                 return r;
1511
1512         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1513                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1514                         return r;
1515
1516         if (add_reference)
1517                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1518                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1519                         return r;
1520
1521         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1522                 return q;
1523
1524         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1525                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1526                         r = v;
1527                         goto fail;
1528                 }
1529
1530         if (add_reference) {
1531                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1532                         r = w;
1533                         goto fail;
1534                 }
1535
1536                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1537                         goto fail;
1538         }
1539
1540         unit_add_to_dbus_queue(u);
1541         return 0;
1542
1543 fail:
1544         if (q > 0)
1545                 set_remove(u->meta.dependencies[d], other);
1546
1547         if (v > 0)
1548                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1549
1550         if (w > 0)
1551                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1552
1553         return r;
1554 }
1555
1556 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1557         int r;
1558
1559         assert(u);
1560
1561         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1562                 return r;
1563
1564         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1565                 return r;
1566
1567         return 0;
1568 }
1569
1570 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1571         char *s;
1572
1573         assert(u);
1574         assert(name || path);
1575
1576         if (!name)
1577                 name = file_name_from_path(path);
1578
1579         if (!unit_name_is_template(name)) {
1580                 *p = NULL;
1581                 return name;
1582         }
1583
1584         if (u->meta.instance)
1585                 s = unit_name_replace_instance(name, u->meta.instance);
1586         else {
1587                 char *i;
1588
1589                 if (!(i = unit_name_to_prefix(u->meta.id)))
1590                         return NULL;
1591
1592                 s = unit_name_replace_instance(name, i);
1593                 free(i);
1594         }
1595
1596         if (!s)
1597                 return NULL;
1598
1599         *p = s;
1600         return s;
1601 }
1602
1603 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1604         Unit *other;
1605         int r;
1606         char *s;
1607
1608         assert(u);
1609         assert(name || path);
1610
1611         if (!(name = resolve_template(u, name, path, &s)))
1612                 return -ENOMEM;
1613
1614         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1615                 goto finish;
1616
1617         r = unit_add_dependency(u, d, other, add_reference);
1618
1619 finish:
1620         free(s);
1621         return r;
1622 }
1623
1624 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1625         Unit *other;
1626         int r;
1627         char *s;
1628
1629         assert(u);
1630         assert(name || path);
1631
1632         if (!(name = resolve_template(u, name, path, &s)))
1633                 return -ENOMEM;
1634
1635         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1636                 goto finish;
1637
1638         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1639
1640 finish:
1641         free(s);
1642         return r;
1643 }
1644
1645 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1646         Unit *other;
1647         int r;
1648         char *s;
1649
1650         assert(u);
1651         assert(name || path);
1652
1653         if (!(name = resolve_template(u, name, path, &s)))
1654                 return -ENOMEM;
1655
1656         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1657                 goto finish;
1658
1659         r = unit_add_dependency(other, d, u, add_reference);
1660
1661 finish:
1662         free(s);
1663         return r;
1664 }
1665
1666 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1667         Unit *other;
1668         int r;
1669         char *s;
1670
1671         assert(u);
1672         assert(name || path);
1673
1674         if (!(name = resolve_template(u, name, path, &s)))
1675                 return -ENOMEM;
1676
1677         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1678                 goto finish;
1679
1680         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1681                 goto finish;
1682
1683 finish:
1684         free(s);
1685         return r;
1686 }
1687
1688 int set_unit_path(const char *p) {
1689         char *cwd, *c;
1690         int r;
1691
1692         /* This is mostly for debug purposes */
1693
1694         if (path_is_absolute(p)) {
1695                 if (!(c = strdup(p)))
1696                         return -ENOMEM;
1697         } else {
1698                 if (!(cwd = get_current_dir_name()))
1699                         return -errno;
1700
1701                 r = asprintf(&c, "%s/%s", cwd, p);
1702                 free(cwd);
1703
1704                 if (r < 0)
1705                         return -ENOMEM;
1706         }
1707
1708         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1709                 r = -errno;
1710                 free(c);
1711                 return r;
1712         }
1713
1714         return 0;
1715 }
1716
1717 char *unit_dbus_path(Unit *u) {
1718         char *p, *e;
1719
1720         assert(u);
1721
1722         if (!u->meta.id)
1723                 return NULL;
1724
1725         if (!(e = bus_path_escape(u->meta.id)))
1726                 return NULL;
1727
1728         p = strappend("/org/freedesktop/systemd1/unit/", e);
1729         free(e);
1730
1731         return p;
1732 }
1733
1734 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1735         int r;
1736
1737         assert(u);
1738         assert(b);
1739
1740         assert(b->path);
1741
1742         if (!b->controller)
1743                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1744                         return -ENOMEM;
1745
1746         /* Ensure this hasn't been added yet */
1747         assert(!b->unit);
1748
1749         if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
1750                 CGroupBonding *l;
1751
1752                 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1753                 LIST_PREPEND(CGroupBonding, by_path, l, b);
1754
1755                 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1756                         LIST_REMOVE(CGroupBonding, by_path, l, b);
1757                         return r;
1758                 }
1759         }
1760
1761         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1762         b->unit = u;
1763
1764         return 0;
1765 }
1766
1767 static char *default_cgroup_path(Unit *u) {
1768         char *p;
1769         int r;
1770
1771         assert(u);
1772
1773         if (u->meta.instance) {
1774                 char *t;
1775
1776                 if (!(t = unit_name_template(u->meta.id)))
1777                         return NULL;
1778
1779                 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1780                 free(t);
1781         } else
1782                 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1783
1784         return r < 0 ? NULL : p;
1785 }
1786
1787 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1788         char *controller = NULL, *path = NULL;
1789         CGroupBonding *b = NULL;
1790         int r;
1791
1792         assert(u);
1793         assert(name);
1794
1795         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1796                 return r;
1797
1798         if (!path)
1799                 path = default_cgroup_path(u);
1800
1801         if (!controller)
1802                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1803
1804         if (!path || !controller) {
1805                 free(path);
1806                 free(controller);
1807
1808                 return -ENOMEM;
1809         }
1810
1811         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1812                 r = -EEXIST;
1813                 goto fail;
1814         }
1815
1816         if (!(b = new0(CGroupBonding, 1))) {
1817                 r = -ENOMEM;
1818                 goto fail;
1819         }
1820
1821         b->controller = controller;
1822         b->path = path;
1823         b->ours = false;
1824
1825         if ((r = unit_add_cgroup(u, b)) < 0)
1826                 goto fail;
1827
1828         return 0;
1829
1830 fail:
1831         free(path);
1832         free(controller);
1833         free(b);
1834
1835         return r;
1836 }
1837
1838 static int unit_add_one_default_cgroup(Unit *u, const char *controller) {
1839         CGroupBonding *b = NULL;
1840         int r = -ENOMEM;
1841
1842         assert(u);
1843
1844         if (!controller)
1845                 controller = SYSTEMD_CGROUP_CONTROLLER;
1846
1847         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller))
1848                 return 0;
1849
1850         if (!(b = new0(CGroupBonding, 1)))
1851                 return -ENOMEM;
1852
1853         if (!(b->controller = strdup(controller)))
1854                 goto fail;
1855
1856         if (!(b->path = default_cgroup_path(u)))
1857                 goto fail;
1858
1859         b->ours = true;
1860         b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1861
1862         if ((r = unit_add_cgroup(u, b)) < 0)
1863                 goto fail;
1864
1865         return 0;
1866
1867 fail:
1868         free(b->path);
1869         free(b->controller);
1870         free(b);
1871
1872         return r;
1873 }
1874
1875 int unit_add_default_cgroups(Unit *u) {
1876         char **c;
1877         int r;
1878         assert(u);
1879
1880         /* Adds in the default cgroups, if they weren't specified
1881          * otherwise. */
1882
1883         if (!u->meta.manager->cgroup_hierarchy)
1884                 return 0;
1885
1886         if ((r = unit_add_one_default_cgroup(u, NULL)) < 0)
1887                 return r;
1888
1889         STRV_FOREACH(c, u->meta.manager->default_controllers)
1890                 if ((r = unit_add_one_default_cgroup(u, *c)) < 0)
1891                         return r;
1892
1893         return 0;
1894 }
1895
1896 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1897         assert(u);
1898
1899         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1900 }
1901
1902 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1903         char *t;
1904         int r;
1905
1906         assert(u);
1907         assert(type);
1908         assert(_found);
1909
1910         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1911                 return -ENOMEM;
1912
1913         assert(!unit_has_name(u, t));
1914
1915         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1916         free(t);
1917
1918         assert(r < 0 || *_found != u);
1919
1920         return r;
1921 }
1922
1923 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1924         Unit *found;
1925         char *t;
1926
1927         assert(u);
1928         assert(type);
1929         assert(_found);
1930
1931         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1932                 return -ENOMEM;
1933
1934         assert(!unit_has_name(u, t));
1935
1936         found = manager_get_unit(u->meta.manager, t);
1937         free(t);
1938
1939         if (!found)
1940                 return -ENOENT;
1941
1942         *_found = found;
1943         return 0;
1944 }
1945
1946 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1947         Unit *u = userdata;
1948         assert(u);
1949
1950         return unit_name_to_prefix_and_instance(u->meta.id);
1951 }
1952
1953 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1954         Unit *u = userdata;
1955         assert(u);
1956
1957         return unit_name_to_prefix(u->meta.id);
1958 }
1959
1960 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1961         Unit *u = userdata;
1962         char *p, *r;
1963
1964         assert(u);
1965
1966         if (!(p = unit_name_to_prefix(u->meta.id)))
1967                 return NULL;
1968
1969         r = unit_name_unescape(p);
1970         free(p);
1971
1972         return r;
1973 }
1974
1975 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1976         Unit *u = userdata;
1977         assert(u);
1978
1979         if (u->meta.instance)
1980                 return unit_name_unescape(u->meta.instance);
1981
1982         return strdup("");
1983 }
1984
1985 static char *specifier_filename(char specifier, void *data, void *userdata) {
1986         Unit *u = userdata;
1987         assert(u);
1988
1989         if (u->meta.instance)
1990                 return unit_name_path_unescape(u->meta.instance);
1991
1992         return unit_name_to_path(u->meta.instance);
1993 }
1994
1995 char *unit_name_printf(Unit *u, const char* format) {
1996
1997         /*
1998          * This will use the passed string as format string and
1999          * replace the following specifiers:
2000          *
2001          * %n: the full id of the unit                 (foo@bar.waldo)
2002          * %N: the id of the unit without the suffix   (foo@bar)
2003          * %p: the prefix                              (foo)
2004          * %i: the instance                            (bar)
2005          */
2006
2007         const Specifier table[] = {
2008                 { 'n', specifier_string,              u->meta.id },
2009                 { 'N', specifier_prefix_and_instance, NULL },
2010                 { 'p', specifier_prefix,              NULL },
2011                 { 'i', specifier_string,              u->meta.instance },
2012                 { 0, NULL, NULL }
2013         };
2014
2015         assert(u);
2016         assert(format);
2017
2018         return specifier_printf(format, table, u);
2019 }
2020
2021 char *unit_full_printf(Unit *u, const char *format) {
2022
2023         /* This is similar to unit_name_printf() but also supports
2024          * unescaping */
2025
2026         const Specifier table[] = {
2027                 { 'n', specifier_string,              u->meta.id },
2028                 { 'N', specifier_prefix_and_instance, NULL },
2029                 { 'p', specifier_prefix,              NULL },
2030                 { 'P', specifier_prefix_unescaped,    NULL },
2031                 { 'i', specifier_string,              u->meta.instance },
2032                 { 'I', specifier_instance_unescaped,  NULL },
2033                 { 'f', specifier_filename,            NULL },
2034                 { 0, NULL, NULL }
2035         };
2036
2037         assert(u);
2038         assert(format);
2039
2040         return specifier_printf(format, table, u);
2041 }
2042
2043 char **unit_full_printf_strv(Unit *u, char **l) {
2044         size_t n;
2045         char **r, **i, **j;
2046
2047         /* Applies unit_full_printf to every entry in l */
2048
2049         assert(u);
2050
2051         n = strv_length(l);
2052         if (!(r = new(char*, n+1)))
2053                 return NULL;
2054
2055         for (i = l, j = r; *i; i++, j++)
2056                 if (!(*j = unit_full_printf(u, *i)))
2057                         goto fail;
2058
2059         *j = NULL;
2060         return r;
2061
2062 fail:
2063         for (j--; j >= r; j--)
2064                 free(*j);
2065
2066         free(r);
2067
2068         return NULL;
2069 }
2070
2071 int unit_watch_bus_name(Unit *u, const char *name) {
2072         assert(u);
2073         assert(name);
2074
2075         /* Watch a specific name on the bus. We only support one unit
2076          * watching each name for now. */
2077
2078         return hashmap_put(u->meta.manager->watch_bus, name, u);
2079 }
2080
2081 void unit_unwatch_bus_name(Unit *u, const char *name) {
2082         assert(u);
2083         assert(name);
2084
2085         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
2086 }
2087
2088 bool unit_can_serialize(Unit *u) {
2089         assert(u);
2090
2091         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
2092 }
2093
2094 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
2095         int r;
2096
2097         assert(u);
2098         assert(f);
2099         assert(fds);
2100
2101         if (!unit_can_serialize(u))
2102                 return 0;
2103
2104         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
2105                 return r;
2106
2107         if (u->meta.job)
2108                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
2109
2110         dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->meta.inactive_exit_timestamp);
2111         dual_timestamp_serialize(f, "active-enter-timestamp", &u->meta.active_enter_timestamp);
2112         dual_timestamp_serialize(f, "active-exit-timestamp", &u->meta.active_exit_timestamp);
2113         dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->meta.inactive_enter_timestamp);
2114         dual_timestamp_serialize(f, "condition-timestamp", &u->meta.condition_timestamp);
2115
2116         if (dual_timestamp_is_set(&u->meta.condition_timestamp))
2117                 unit_serialize_item(u, f, "condition-result", yes_no(u->meta.condition_result));
2118
2119         /* End marker */
2120         fputc('\n', f);
2121         return 0;
2122 }
2123
2124 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2125         va_list ap;
2126
2127         assert(u);
2128         assert(f);
2129         assert(key);
2130         assert(format);
2131
2132         fputs(key, f);
2133         fputc('=', f);
2134
2135         va_start(ap, format);
2136         vfprintf(f, format, ap);
2137         va_end(ap);
2138
2139         fputc('\n', f);
2140 }
2141
2142 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2143         assert(u);
2144         assert(f);
2145         assert(key);
2146         assert(value);
2147
2148         fprintf(f, "%s=%s\n", key, value);
2149 }
2150
2151 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2152         int r;
2153
2154         assert(u);
2155         assert(f);
2156         assert(fds);
2157
2158         if (!unit_can_serialize(u))
2159                 return 0;
2160
2161         for (;;) {
2162                 char line[LINE_MAX], *l, *v;
2163                 size_t k;
2164
2165                 if (!fgets(line, sizeof(line), f)) {
2166                         if (feof(f))
2167                                 return 0;
2168                         return -errno;
2169                 }
2170
2171                 char_array_0(line);
2172                 l = strstrip(line);
2173
2174                 /* End marker */
2175                 if (l[0] == 0)
2176                         return 0;
2177
2178                 k = strcspn(l, "=");
2179
2180                 if (l[k] == '=') {
2181                         l[k] = 0;
2182                         v = l+k+1;
2183                 } else
2184                         v = l+k;
2185
2186                 if (streq(l, "job")) {
2187                         JobType type;
2188
2189                         if ((type = job_type_from_string(v)) < 0)
2190                                 log_debug("Failed to parse job type value %s", v);
2191                         else
2192                                 u->meta.deserialized_job = type;
2193
2194                         continue;
2195                 } else if (streq(l, "inactive-exit-timestamp")) {
2196                         dual_timestamp_deserialize(v, &u->meta.inactive_exit_timestamp);
2197                         continue;
2198                 } else if (streq(l, "active-enter-timestamp")) {
2199                         dual_timestamp_deserialize(v, &u->meta.active_enter_timestamp);
2200                         continue;
2201                 } else if (streq(l, "active-exit-timestamp")) {
2202                         dual_timestamp_deserialize(v, &u->meta.active_exit_timestamp);
2203                         continue;
2204                 } else if (streq(l, "inactive-enter-timestamp")) {
2205                         dual_timestamp_deserialize(v, &u->meta.inactive_enter_timestamp);
2206                         continue;
2207                 } else if (streq(l, "condition-timestamp")) {
2208                         dual_timestamp_deserialize(v, &u->meta.condition_timestamp);
2209                         continue;
2210                 } else if (streq(l, "condition-result")) {
2211                         int b;
2212
2213                         if ((b = parse_boolean(v)) < 0)
2214                                 log_debug("Failed to parse condition result value %s", v);
2215                         else
2216                                 u->meta.condition_result = b;
2217
2218                         continue;
2219                 }
2220
2221                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2222                         return r;
2223         }
2224 }
2225
2226 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2227         Unit *device;
2228         char *e;
2229         int r;
2230
2231         assert(u);
2232
2233         if (!what)
2234                 return 0;
2235
2236         /* Adds in links to the device node that this unit is based on */
2237
2238         if (!is_device_path(what))
2239                 return 0;
2240
2241         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2242                 return -ENOMEM;
2243
2244         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2245         free(e);
2246
2247         if (r < 0)
2248                 return r;
2249
2250         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BIND_TO, device, true)) < 0)
2251                 return r;
2252
2253         if (wants)
2254                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2255                         return r;
2256
2257         return 0;
2258 }
2259
2260 int unit_coldplug(Unit *u) {
2261         int r;
2262
2263         assert(u);
2264
2265         if (UNIT_VTABLE(u)->coldplug)
2266                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2267                         return r;
2268
2269         if (u->meta.deserialized_job >= 0) {
2270                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_IGNORE_REQUIREMENTS, false, NULL, NULL)) < 0)
2271                         return r;
2272
2273                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2274         }
2275
2276         return 0;
2277 }
2278
2279 void unit_status_printf(Unit *u, const char *format, ...) {
2280         va_list ap;
2281
2282         assert(u);
2283         assert(format);
2284
2285         if (!UNIT_VTABLE(u)->show_status)
2286                 return;
2287
2288         if (u->meta.manager->running_as != MANAGER_SYSTEM)
2289                 return;
2290
2291         /* If Plymouth is running make sure we show the status, so
2292          * that there's something nice to see when people press Esc */
2293
2294         if (!u->meta.manager->show_status && !plymouth_running())
2295                 return;
2296
2297         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2298                 return;
2299
2300         va_start(ap, format);
2301         status_vprintf(format, ap);
2302         va_end(ap);
2303 }
2304
2305 bool unit_need_daemon_reload(Unit *u) {
2306         struct stat st;
2307
2308         assert(u);
2309
2310         if (!u->meta.fragment_path)
2311                 return false;
2312
2313         zero(st);
2314         if (stat(u->meta.fragment_path, &st) < 0)
2315                 /* What, cannot access this anymore? */
2316                 return true;
2317
2318         return
2319                 u->meta.fragment_mtime &&
2320                 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2321 }
2322
2323 void unit_reset_failed(Unit *u) {
2324         assert(u);
2325
2326         if (UNIT_VTABLE(u)->reset_failed)
2327                 UNIT_VTABLE(u)->reset_failed(u);
2328 }
2329
2330 Unit *unit_following(Unit *u) {
2331         assert(u);
2332
2333         if (UNIT_VTABLE(u)->following)
2334                 return UNIT_VTABLE(u)->following(u);
2335
2336         return NULL;
2337 }
2338
2339 bool unit_pending_inactive(Unit *u) {
2340         assert(u);
2341
2342         /* Returns true if the unit is inactive or going down */
2343
2344         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2345                 return true;
2346
2347         if (u->meta.job && u->meta.job->type == JOB_STOP)
2348                 return true;
2349
2350         return false;
2351 }
2352
2353 bool unit_pending_active(Unit *u) {
2354         assert(u);
2355
2356         /* Returns true if the unit is inactive or going down */
2357
2358         if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2359                 return true;
2360
2361         if (u->meta.job &&
2362             (u->meta.job->type == JOB_START ||
2363              u->meta.job->type == JOB_RELOAD_OR_START ||
2364              u->meta.job->type == JOB_RESTART))
2365                 return true;
2366
2367         return false;
2368 }
2369
2370 UnitType unit_name_to_type(const char *n) {
2371         UnitType t;
2372
2373         assert(n);
2374
2375         for (t = 0; t < _UNIT_TYPE_MAX; t++)
2376                 if (endswith(n, unit_vtable[t]->suffix))
2377                         return t;
2378
2379         return _UNIT_TYPE_INVALID;
2380 }
2381
2382 bool unit_name_is_valid(const char *n, bool template_ok) {
2383         UnitType t;
2384
2385         t = unit_name_to_type(n);
2386         if (t < 0 || t >= _UNIT_TYPE_MAX)
2387                 return false;
2388
2389         return unit_name_is_valid_no_type(n, template_ok);
2390 }
2391
2392 int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error) {
2393         assert(u);
2394         assert(w >= 0 && w < _KILL_WHO_MAX);
2395         assert(m >= 0 && m < _KILL_MODE_MAX);
2396         assert(signo > 0);
2397         assert(signo < _NSIG);
2398
2399         if (m == KILL_NONE)
2400                 return 0;
2401
2402         if (!UNIT_VTABLE(u)->kill)
2403                 return -ENOTSUP;
2404
2405         return UNIT_VTABLE(u)->kill(u, w, m, signo, error);
2406 }
2407
2408
2409 int unit_following_set(Unit *u, Set **s) {
2410         assert(u);
2411         assert(s);
2412
2413         if (UNIT_VTABLE(u)->following_set)
2414                 return UNIT_VTABLE(u)->following_set(u, s);
2415
2416         *s = NULL;
2417         return 0;
2418 }
2419
2420 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2421         [UNIT_STUB] = "stub",
2422         [UNIT_LOADED] = "loaded",
2423         [UNIT_ERROR] = "error",
2424         [UNIT_MERGED] = "merged",
2425         [UNIT_MASKED] = "masked"
2426 };
2427
2428 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2429
2430 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2431         [UNIT_ACTIVE] = "active",
2432         [UNIT_RELOADING] = "reloading",
2433         [UNIT_INACTIVE] = "inactive",
2434         [UNIT_FAILED] = "failed",
2435         [UNIT_ACTIVATING] = "activating",
2436         [UNIT_DEACTIVATING] = "deactivating"
2437 };
2438
2439 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2440
2441 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2442         [UNIT_REQUIRES] = "Requires",
2443         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2444         [UNIT_WANTS] = "Wants",
2445         [UNIT_REQUISITE] = "Requisite",
2446         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2447         [UNIT_REQUIRED_BY] = "RequiredBy",
2448         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2449         [UNIT_BIND_TO] = "BindTo",
2450         [UNIT_WANTED_BY] = "WantedBy",
2451         [UNIT_CONFLICTS] = "Conflicts",
2452         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2453         [UNIT_BOUND_BY] = "BoundBy",
2454         [UNIT_BEFORE] = "Before",
2455         [UNIT_AFTER] = "After",
2456         [UNIT_REFERENCES] = "References",
2457         [UNIT_REFERENCED_BY] = "ReferencedBy",
2458         [UNIT_ON_FAILURE] = "OnFailure"
2459 };
2460
2461 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);