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