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 #include "cgroup-attr.h"
  46
  47 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
  48         [UNIT_SERVICE] = &service_vtable,
  49         [UNIT_TIMER] = &timer_vtable,
  50         [UNIT_SOCKET] = &socket_vtable,
  51         [UNIT_TARGET] = &target_vtable,
  52         [UNIT_DEVICE] = &device_vtable,
  53         [UNIT_MOUNT] = &mount_vtable,
  54         [UNIT_AUTOMOUNT] = &automount_vtable,
  55         [UNIT_SNAPSHOT] = &snapshot_vtable,
  56         [UNIT_SWAP] = &swap_vtable,
  57         [UNIT_PATH] = &path_vtable
  58 };
  59
  60 Unit *unit_new(Manager *m) {
  61         Unit *u;
  62
  63         assert(m);
  64
  65         if (!(u = new0(Unit, 1)))
  66                 return NULL;
  67
  68         if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
  69                 free(u);
  70                 return NULL;
  71         }
  72
  73         u->meta.manager = m;
  74         u->meta.type = _UNIT_TYPE_INVALID;
  75         u->meta.deserialized_job = _JOB_TYPE_INVALID;
  76         u->meta.default_dependencies = true;
  77         u->meta.unit_file_state = _UNIT_FILE_STATE_INVALID;
  78
  79         return u;
  80 }
  81
  82 bool unit_has_name(Unit *u, const char *name) {
  83         assert(u);
  84         assert(name);
  85
  86         return !!set_get(u->meta.names, (char*) name);
  87 }
  88
  89 int unit_add_name(Unit *u, const char *text) {
  90         UnitType t;
  91         char *s, *i = NULL;
  92         int r;
  93
  94         assert(u);
  95         assert(text);
  96
  97         if (unit_name_is_template(text)) {
  98                 if (!u->meta.instance)
  99                         return -EINVAL;
 100
 101                 s = unit_name_replace_instance(text, u->meta.instance);
 102         } else
 103                 s = strdup(text);
 104
 105         if (!s)
 106                 return -ENOMEM;
 107
 108         if (!unit_name_is_valid(s, false)) {
 109                 r = -EINVAL;
 110                 goto fail;
 111         }
 112
 113         assert_se((t = unit_name_to_type(s)) >= 0);
 114
 115         if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
 116                 r = -EINVAL;
 117                 goto fail;
 118         }
 119
 120         if ((r = unit_name_to_instance(s, &i)) < 0)
 121                 goto fail;
 122
 123         if (i && unit_vtable[t]->no_instances) {
 124                 r = -EINVAL;
 125                 goto fail;
 126         }
 127
 128         /* Ensure that this unit is either instanced or not instanced,
 129          * but not both. */
 130         if (u->meta.type != _UNIT_TYPE_INVALID && !u->meta.instance != !i) {
 131                 r = -EINVAL;
 132                 goto fail;
 133         }
 134
 135         if (unit_vtable[t]->no_alias &&
 136             !set_isempty(u->meta.names) &&
 137             !set_get(u->meta.names, s)) {
 138                 r = -EEXIST;
 139                 goto fail;
 140         }
 141
 142         if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
 143                 r = -E2BIG;
 144                 goto fail;
 145         }
 146
 147         if ((r = set_put(u->meta.names, s)) < 0) {
 148                 if (r == -EEXIST)
 149                         r = 0;
 150                 goto fail;
 151         }
 152
 153         if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
 154                 set_remove(u->meta.names, s);
 155                 goto fail;
 156         }
 157
 158         if (u->meta.type == _UNIT_TYPE_INVALID) {
 159
 160                 u->meta.type = t;
 161                 u->meta.id = s;
 162                 u->meta.instance = i;
 163
 164                 LIST_PREPEND(Meta, units_by_type, u->meta.manager->units_by_type[t], &u->meta);
 165
 166                 if (UNIT_VTABLE(u)->init)
 167                         UNIT_VTABLE(u)->init(u);
 168         } else
 169                 free(i);
 170
 171         unit_add_to_dbus_queue(u);
 172         return 0;
 173
 174 fail:
 175         free(s);
 176         free(i);
 177
 178         return r;
 179 }
 180
 181 int unit_choose_id(Unit *u, const char *name) {
 182         char *s, *t = NULL, *i;
 183         int r;
 184
 185         assert(u);
 186         assert(name);
 187
 188         if (unit_name_is_template(name)) {
 189
 190                 if (!u->meta.instance)
 191                         return -EINVAL;
 192
 193                 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
 194                         return -ENOMEM;
 195
 196                 name = t;
 197         }
 198
 199         /* Selects one of the names of this unit as the id */
 200         s = set_get(u->meta.names, (char*) name);
 201         free(t);
 202
 203         if (!s)
 204                 return -ENOENT;
 205
 206         if ((r = unit_name_to_instance(s, &i)) < 0)
 207                 return r;
 208
 209         u->meta.id = s;
 210
 211         free(u->meta.instance);
 212         u->meta.instance = i;
 213
 214         unit_add_to_dbus_queue(u);
 215
 216         return 0;
 217 }
 218
 219 int unit_set_description(Unit *u, const char *description) {
 220         char *s;
 221
 222         assert(u);
 223
 224         if (!(s = strdup(description)))
 225                 return -ENOMEM;
 226
 227         free(u->meta.description);
 228         u->meta.description = s;
 229
 230         unit_add_to_dbus_queue(u);
 231         return 0;
 232 }
 233
 234 bool unit_check_gc(Unit *u) {
 235         assert(u);
 236
 237         if (u->meta.load_state == UNIT_STUB)
 238                 return true;
 239
 240         if (UNIT_VTABLE(u)->no_gc)
 241                 return true;
 242
 243         if (u->meta.no_gc)
 244                 return true;
 245
 246         if (u->meta.job)
 247                 return true;
 248
 249         if (unit_active_state(u) != UNIT_INACTIVE)
 250                 return true;
 251
 252         if (UNIT_VTABLE(u)->check_gc)
 253                 if (UNIT_VTABLE(u)->check_gc(u))
 254                         return true;
 255
 256         return false;
 257 }
 258
 259 void unit_add_to_load_queue(Unit *u) {
 260         assert(u);
 261         assert(u->meta.type != _UNIT_TYPE_INVALID);
 262
 263         if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
 264                 return;
 265
 266         LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 267         u->meta.in_load_queue = true;
 268 }
 269
 270 void unit_add_to_cleanup_queue(Unit *u) {
 271         assert(u);
 272
 273         if (u->meta.in_cleanup_queue)
 274                 return;
 275
 276         LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 277         u->meta.in_cleanup_queue = true;
 278 }
 279
 280 void unit_add_to_gc_queue(Unit *u) {
 281         assert(u);
 282
 283         if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
 284                 return;
 285
 286         if (unit_check_gc(u))
 287                 return;
 288
 289         LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 290         u->meta.in_gc_queue = true;
 291
 292         u->meta.manager->n_in_gc_queue ++;
 293
 294         if (u->meta.manager->gc_queue_timestamp <= 0)
 295                 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
 296 }
 297
 298 void unit_add_to_dbus_queue(Unit *u) {
 299         assert(u);
 300         assert(u->meta.type != _UNIT_TYPE_INVALID);
 301
 302         if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
 303                 return;
 304
 305         /* Shortcut things if nobody cares */
 306         if (!bus_has_subscriber(u->meta.manager)) {
 307                 u->meta.sent_dbus_new_signal = true;
 308                 return;
 309         }
 310
 311         LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 312         u->meta.in_dbus_queue = true;
 313 }
 314
 315 static void bidi_set_free(Unit *u, Set *s) {
 316         Iterator i;
 317         Unit *other;
 318
 319         assert(u);
 320
 321         /* Frees the set and makes sure we are dropped from the
 322          * inverse pointers */
 323
 324         SET_FOREACH(other, s, i) {
 325                 UnitDependency d;
 326
 327                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 328                         set_remove(other->meta.dependencies[d], u);
 329
 330                 unit_add_to_gc_queue(other);
 331         }
 332
 333         set_free(s);
 334 }
 335
 336 void unit_free(Unit *u) {
 337         UnitDependency d;
 338         Iterator i;
 339         char *t;
 340
 341         assert(u);
 342
 343         bus_unit_send_removed_signal(u);
 344
 345         if (u->meta.load_state != UNIT_STUB)
 346                 if (UNIT_VTABLE(u)->done)
 347                         UNIT_VTABLE(u)->done(u);
 348
 349         SET_FOREACH(t, u->meta.names, i)
 350                 hashmap_remove_value(u->meta.manager->units, t, u);
 351
 352         if (u->meta.job)
 353                 job_free(u->meta.job);
 354
 355         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 356                 bidi_set_free(u, u->meta.dependencies[d]);
 357
 358         if (u->meta.type != _UNIT_TYPE_INVALID)
 359                 LIST_REMOVE(Meta, units_by_type, u->meta.manager->units_by_type[u->meta.type], &u->meta);
 360
 361         if (u->meta.in_load_queue)
 362                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 363
 364         if (u->meta.in_dbus_queue)
 365                 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 366
 367         if (u->meta.in_cleanup_queue)
 368                 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
 369
 370         if (u->meta.in_gc_queue) {
 371                 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
 372                 u->meta.manager->n_in_gc_queue--;
 373         }
 374
 375         cgroup_bonding_free_list(u->meta.cgroup_bondings, u->meta.manager->n_reloading <= 0);
 376         cgroup_attribute_free_list(u->meta.cgroup_attributes);
 377
 378         free(u->meta.description);
 379         free(u->meta.fragment_path);
 380
 381         set_free_free(u->meta.names);
 382
 383         condition_free_list(u->meta.conditions);
 384
 385         free(u->meta.instance);
 386         free(u);
 387 }
 388
 389 UnitActiveState unit_active_state(Unit *u) {
 390         assert(u);
 391
 392         if (u->meta.load_state == UNIT_MERGED)
 393                 return unit_active_state(unit_follow_merge(u));
 394
 395         /* After a reload it might happen that a unit is not correctly
 396          * loaded but still has a process around. That's why we won't
 397          * shortcut failed loading to UNIT_INACTIVE_FAILED. */
 398
 399         return UNIT_VTABLE(u)->active_state(u);
 400 }
 401
 402 const char* unit_sub_state_to_string(Unit *u) {
 403         assert(u);
 404
 405         return UNIT_VTABLE(u)->sub_state_to_string(u);
 406 }
 407
 408 static void complete_move(Set **s, Set **other) {
 409         assert(s);
 410         assert(other);
 411
 412         if (!*other)
 413                 return;
 414
 415         if (*s)
 416                 set_move(*s, *other);
 417         else {
 418                 *s = *other;
 419                 *other = NULL;
 420         }
 421 }
 422
 423 static void merge_names(Unit *u, Unit *other) {
 424         char *t;
 425         Iterator i;
 426
 427         assert(u);
 428         assert(other);
 429
 430         complete_move(&u->meta.names, &other->meta.names);
 431
 432         set_free_free(other->meta.names);
 433         other->meta.names = NULL;
 434         other->meta.id = NULL;
 435
 436         SET_FOREACH(t, u->meta.names, i)
 437                 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
 438 }
 439
 440 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
 441         Iterator i;
 442         Unit *back;
 443         int r;
 444
 445         assert(u);
 446         assert(other);
 447         assert(d < _UNIT_DEPENDENCY_MAX);
 448
 449         /* Fix backwards pointers */
 450         SET_FOREACH(back, other->meta.dependencies[d], i) {
 451                 UnitDependency k;
 452
 453                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
 454                         if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
 455
 456                                 if (r == -EEXIST)
 457                                         set_remove(back->meta.dependencies[k], other);
 458                                 else
 459                                         assert(r == -ENOENT);
 460                         }
 461         }
 462
 463         complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
 464
 465         set_free(other->meta.dependencies[d]);
 466         other->meta.dependencies[d] = NULL;
 467 }
 468
 469 int unit_merge(Unit *u, Unit *other) {
 470         UnitDependency d;
 471
 472         assert(u);
 473         assert(other);
 474         assert(u->meta.manager == other->meta.manager);
 475         assert(u->meta.type != _UNIT_TYPE_INVALID);
 476
 477         other = unit_follow_merge(other);
 478
 479         if (other == u)
 480                 return 0;
 481
 482         if (u->meta.type != other->meta.type)
 483                 return -EINVAL;
 484
 485         if (!u->meta.instance != !other->meta.instance)
 486                 return -EINVAL;
 487
 488         if (other->meta.load_state != UNIT_STUB &&
 489             other->meta.load_state != UNIT_ERROR)
 490                 return -EEXIST;
 491
 492         if (other->meta.job)
 493                 return -EEXIST;
 494
 495         if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
 496                 return -EEXIST;
 497
 498         /* Merge names */
 499         merge_names(u, other);
 500
 501         /* Merge dependencies */
 502         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
 503                 merge_dependencies(u, other, d);
 504
 505         other->meta.load_state = UNIT_MERGED;
 506         other->meta.merged_into = u;
 507
 508         /* If there is still some data attached to the other node, we
 509          * don't need it anymore, and can free it. */
 510         if (other->meta.load_state != UNIT_STUB)
 511                 if (UNIT_VTABLE(other)->done)
 512                         UNIT_VTABLE(other)->done(other);
 513
 514         unit_add_to_dbus_queue(u);
 515         unit_add_to_cleanup_queue(other);
 516
 517         return 0;
 518 }
 519
 520 int unit_merge_by_name(Unit *u, const char *name) {
 521         Unit *other;
 522         int r;
 523         char *s = NULL;
 524
 525         assert(u);
 526         assert(name);
 527
 528         if (unit_name_is_template(name)) {
 529                 if (!u->meta.instance)
 530                         return -EINVAL;
 531
 532                 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
 533                         return -ENOMEM;
 534
 535                 name = s;
 536         }
 537
 538         if (!(other = manager_get_unit(u->meta.manager, name)))
 539                 r = unit_add_name(u, name);
 540         else
 541                 r = unit_merge(u, other);
 542
 543         free(s);
 544         return r;
 545 }
 546
 547 Unit* unit_follow_merge(Unit *u) {
 548         assert(u);
 549
 550         while (u->meta.load_state == UNIT_MERGED)
 551                 assert_se(u = u->meta.merged_into);
 552
 553         return u;
 554 }
 555
 556 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
 557         int r;
 558
 559         assert(u);
 560         assert(c);
 561
 562         if (c->std_output != EXEC_OUTPUT_KMSG &&
 563             c->std_output != EXEC_OUTPUT_SYSLOG &&
 564             c->std_output != EXEC_OUTPUT_JOURNAL &&
 565             c->std_output != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
 566             c->std_output != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
 567             c->std_output != EXEC_OUTPUT_JOURNAL_AND_CONSOLE &&
 568             c->std_error != EXEC_OUTPUT_KMSG &&
 569             c->std_error != EXEC_OUTPUT_SYSLOG &&
 570             c->std_error != EXEC_OUTPUT_JOURNAL &&
 571             c->std_error != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
 572             c->std_error != EXEC_OUTPUT_JOURNAL_AND_CONSOLE &&
 573             c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE)
 574                 return 0;
 575
 576         /* If syslog or kernel logging is requested, make sure our own
 577          * logging daemon is run first. */
 578
 579         if (u->meta.manager->running_as == MANAGER_SYSTEM)
 580                 if ((r = unit_add_two_dependencies_by_name(u, UNIT_REQUIRES, UNIT_AFTER, SPECIAL_JOURNALD_SOCKET, NULL, true)) < 0)
 581                         return r;
 582
 583         return 0;
 584 }
 585
 586 const char *unit_description(Unit *u) {
 587         assert(u);
 588
 589         if (u->meta.description)
 590                 return u->meta.description;
 591
 592         return strna(u->meta.id);
 593 }
 594
 595 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 596         char *t;
 597         UnitDependency d;
 598         Iterator i;
 599         char *p2;
 600         const char *prefix2;
 601         char
 602                 timestamp1[FORMAT_TIMESTAMP_MAX],
 603                 timestamp2[FORMAT_TIMESTAMP_MAX],
 604                 timestamp3[FORMAT_TIMESTAMP_MAX],
 605                 timestamp4[FORMAT_TIMESTAMP_MAX],
 606                 timespan[FORMAT_TIMESPAN_MAX];
 607         Unit *following;
 608
 609         assert(u);
 610         assert(u->meta.type >= 0);
 611
 612         if (!prefix)
 613                 prefix = "";
 614         p2 = strappend(prefix, "\t");
 615         prefix2 = p2 ? p2 : prefix;
 616
 617         fprintf(f,
 618                 "%s-> Unit %s:\n"
 619                 "%s\tDescription: %s\n"
 620                 "%s\tInstance: %s\n"
 621                 "%s\tUnit Load State: %s\n"
 622                 "%s\tUnit Active State: %s\n"
 623                 "%s\tInactive Exit Timestamp: %s\n"
 624                 "%s\tActive Enter Timestamp: %s\n"
 625                 "%s\tActive Exit Timestamp: %s\n"
 626                 "%s\tInactive Enter Timestamp: %s\n"
 627                 "%s\tGC Check Good: %s\n"
 628                 "%s\tNeed Daemon Reload: %s\n",
 629                 prefix, u->meta.id,
 630                 prefix, unit_description(u),
 631                 prefix, strna(u->meta.instance),
 632                 prefix, unit_load_state_to_string(u->meta.load_state),
 633                 prefix, unit_active_state_to_string(unit_active_state(u)),
 634                 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
 635                 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
 636                 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
 637                 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
 638                 prefix, yes_no(unit_check_gc(u)),
 639                 prefix, yes_no(unit_need_daemon_reload(u)));
 640
 641         SET_FOREACH(t, u->meta.names, i)
 642                 fprintf(f, "%s\tName: %s\n", prefix, t);
 643
 644         if ((following = unit_following(u)))
 645                 fprintf(f, "%s\tFollowing: %s\n", prefix, following->meta.id);
 646
 647         if (u->meta.fragment_path)
 648                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
 649
 650         if (u->meta.job_timeout > 0)
 651                 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->meta.job_timeout));
 652
 653         condition_dump_list(u->meta.conditions, f, prefix);
 654
 655         if (dual_timestamp_is_set(&u->meta.condition_timestamp))
 656                 fprintf(f,
 657                         "%s\tCondition Timestamp: %s\n"
 658                         "%s\tCondition Result: %s\n",
 659                         prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.condition_timestamp.realtime)),
 660                         prefix, yes_no(u->meta.condition_result));
 661
 662         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
 663                 Unit *other;
 664
 665                 SET_FOREACH(other, u->meta.dependencies[d], i)
 666                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
 667         }
 668
 669         if (u->meta.load_state == UNIT_LOADED) {
 670                 CGroupBonding *b;
 671                 CGroupAttribute *a;
 672
 673                 fprintf(f,
 674                         "%s\tStopWhenUnneeded: %s\n"
 675                         "%s\tRefuseManualStart: %s\n"
 676                         "%s\tRefuseManualStop: %s\n"
 677                         "%s\tDefaultDependencies: %s\n"
 678                         "%s\tOnFailureIsolate: %s\n"
 679                         "%s\tIgnoreOnIsolate: %s\n"
 680                         "%s\tIgnoreOnSnapshot: %s\n",
 681                         prefix, yes_no(u->meta.stop_when_unneeded),
 682                         prefix, yes_no(u->meta.refuse_manual_start),
 683                         prefix, yes_no(u->meta.refuse_manual_stop),
 684                         prefix, yes_no(u->meta.default_dependencies),
 685                         prefix, yes_no(u->meta.on_failure_isolate),
 686                         prefix, yes_no(u->meta.ignore_on_isolate),
 687                         prefix, yes_no(u->meta.ignore_on_snapshot));
 688
 689                 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
 690                         fprintf(f, "%s\tControlGroup: %s:%s\n",
 691                                 prefix, b->controller, b->path);
 692
 693                 LIST_FOREACH(by_unit, a, u->meta.cgroup_attributes) {
 694                         char *v = NULL;
 695
 696                         if (a->map_callback)
 697                                 a->map_callback(a->controller, a->name, a->value, &v);
 698
 699                         fprintf(f, "%s\tControlGroupAttribute: %s %s \"%s\"\n",
 700                                 prefix, a->controller, a->name, v ? v : a->value);
 701
 702                         free(v);
 703                 }
 704
 705                 if (UNIT_VTABLE(u)->dump)
 706                         UNIT_VTABLE(u)->dump(u, f, prefix2);
 707
 708         } else if (u->meta.load_state == UNIT_MERGED)
 709                 fprintf(f,
 710                         "%s\tMerged into: %s\n",
 711                         prefix, u->meta.merged_into->meta.id);
 712         else if (u->meta.load_state == UNIT_ERROR)
 713                 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->meta.load_error));
 714
 715
 716         if (u->meta.job)
 717                 job_dump(u->meta.job, f, prefix2);
 718
 719         free(p2);
 720 }
 721
 722 /* Common implementation for multiple backends */
 723 int unit_load_fragment_and_dropin(Unit *u) {
 724         int r;
 725
 726         assert(u);
 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                 return -ENOENT;
 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 /* Common implementation for multiple backends */
 743 int unit_load_fragment_and_dropin_optional(Unit *u) {
 744         int r;
 745
 746         assert(u);
 747
 748         /* Same as unit_load_fragment_and_dropin(), but whether
 749          * something can be loaded or not doesn't matter. */
 750
 751         /* Load a .service file */
 752         if ((r = unit_load_fragment(u)) < 0)
 753                 return r;
 754
 755         if (u->meta.load_state == UNIT_STUB)
 756                 u->meta.load_state = UNIT_LOADED;
 757
 758         /* Load drop-in directory data */
 759         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
 760                 return r;
 761
 762         return 0;
 763 }
 764
 765 int unit_add_default_target_dependency(Unit *u, Unit *target) {
 766         assert(u);
 767         assert(target);
 768
 769         if (target->meta.type != UNIT_TARGET)
 770                 return 0;
 771
 772         /* Only add the dependency if both units are loaded, so that
 773          * that loop check below is reliable */
 774         if (u->meta.load_state != UNIT_LOADED ||
 775             target->meta.load_state != UNIT_LOADED)
 776                 return 0;
 777
 778         /* If either side wants no automatic dependencies, then let's
 779          * skip this */
 780         if (!u->meta.default_dependencies ||
 781             !target->meta.default_dependencies)
 782                 return 0;
 783
 784         /* Don't create loops */
 785         if (set_get(target->meta.dependencies[UNIT_BEFORE], u))
 786                 return 0;
 787
 788         return unit_add_dependency(target, UNIT_AFTER, u, true);
 789 }
 790
 791 static int unit_add_default_dependencies(Unit *u) {
 792         static const UnitDependency deps[] = {
 793                 UNIT_REQUIRED_BY,
 794                 UNIT_REQUIRED_BY_OVERRIDABLE,
 795                 UNIT_WANTED_BY,
 796                 UNIT_BOUND_BY
 797         };
 798
 799         Unit *target;
 800         Iterator i;
 801         int r;
 802         unsigned k;
 803
 804         assert(u);
 805
 806         for (k = 0; k < ELEMENTSOF(deps); k++)
 807                 SET_FOREACH(target, u->meta.dependencies[deps[k]], i)
 808                         if ((r = unit_add_default_target_dependency(u, target)) < 0)
 809                                 return r;
 810
 811         return 0;
 812 }
 813
 814 int unit_load(Unit *u) {
 815         int r;
 816
 817         assert(u);
 818
 819         if (u->meta.in_load_queue) {
 820                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 821                 u->meta.in_load_queue = false;
 822         }
 823
 824         if (u->meta.type == _UNIT_TYPE_INVALID)
 825                 return -EINVAL;
 826
 827         if (u->meta.load_state != UNIT_STUB)
 828                 return 0;
 829
 830         if (UNIT_VTABLE(u)->load)
 831                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
 832                         goto fail;
 833
 834         if (u->meta.load_state == UNIT_STUB) {
 835                 r = -ENOENT;
 836                 goto fail;
 837         }
 838
 839         if (u->meta.load_state == UNIT_LOADED &&
 840             u->meta.default_dependencies)
 841                 if ((r = unit_add_default_dependencies(u)) < 0)
 842                         goto fail;
 843
 844         if (u->meta.on_failure_isolate &&
 845             set_size(u->meta.dependencies[UNIT_ON_FAILURE]) > 1) {
 846
 847                 log_error("More than one OnFailure= dependencies specified for %s but OnFailureIsolate= enabled. Refusing.",
 848                           u->meta.id);
 849
 850                 r = -EINVAL;
 851                 goto fail;
 852         }
 853
 854         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
 855
 856         unit_add_to_dbus_queue(unit_follow_merge(u));
 857         unit_add_to_gc_queue(u);
 858
 859         return 0;
 860
 861 fail:
 862         u->meta.load_state = UNIT_ERROR;
 863         u->meta.load_error = r;
 864         unit_add_to_dbus_queue(u);
 865         unit_add_to_gc_queue(u);
 866
 867         log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
 868
 869         return r;
 870 }
 871
 872 bool unit_condition_test(Unit *u) {
 873         assert(u);
 874
 875         dual_timestamp_get(&u->meta.condition_timestamp);
 876         u->meta.condition_result = condition_test_list(u->meta.conditions);
 877
 878         return u->meta.condition_result;
 879 }
 880
 881 /* Errors:
 882  *         -EBADR:     This unit type does not support starting.
 883  *         -EALREADY:  Unit is already started.
 884  *         -EAGAIN:    An operation is already in progress. Retry later.
 885  *         -ECANCELED: Too many requests for now.
 886  */
 887 int unit_start(Unit *u) {
 888         UnitActiveState state;
 889         Unit *following;
 890
 891         assert(u);
 892
 893         if (u->meta.load_state != UNIT_LOADED)
 894                 return -EINVAL;
 895
 896         /* If this is already started, then this will succeed. Note
 897          * that this will even succeed if this unit is not startable
 898          * by the user. This is relied on to detect when we need to
 899          * wait for units and when waiting is finished. */
 900         state = unit_active_state(u);
 901         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
 902                 return -EALREADY;
 903
 904         /* If the conditions failed, don't do anything at all. If we
 905          * already are activating this call might still be useful to
 906          * speed up activation in case there is some hold-off time,
 907          * but we don't want to recheck the condition in that case. */
 908         if (state != UNIT_ACTIVATING &&
 909             !unit_condition_test(u)) {
 910                 log_debug("Starting of %s requested but condition failed. Ignoring.", u->meta.id);
 911                 return -EALREADY;
 912         }
 913
 914         /* Forward to the main object, if we aren't it. */
 915         if ((following = unit_following(u))) {
 916                 log_debug("Redirecting start request from %s to %s.", u->meta.id, following->meta.id);
 917                 return unit_start(following);
 918         }
 919
 920         /* If it is stopped, but we cannot start it, then fail */
 921         if (!UNIT_VTABLE(u)->start)
 922                 return -EBADR;
 923
 924         /* We don't suppress calls to ->start() here when we are
 925          * already starting, to allow this request to be used as a
 926          * "hurry up" call, for example when the unit is in some "auto
 927          * restart" state where it waits for a holdoff timer to elapse
 928          * before it will start again. */
 929
 930         unit_add_to_dbus_queue(u);
 931
 932         unit_status_printf(u, NULL, "Starting %s...", unit_description(u));
 933         return UNIT_VTABLE(u)->start(u);
 934 }
 935
 936 bool unit_can_start(Unit *u) {
 937         assert(u);
 938
 939         return !!UNIT_VTABLE(u)->start;
 940 }
 941
 942 bool unit_can_isolate(Unit *u) {
 943         assert(u);
 944
 945         return unit_can_start(u) &&
 946                 u->meta.allow_isolate;
 947 }
 948
 949 /* Errors:
 950  *         -EBADR:    This unit type does not support stopping.
 951  *         -EALREADY: Unit is already stopped.
 952  *         -EAGAIN:   An operation is already in progress. Retry later.
 953  */
 954 int unit_stop(Unit *u) {
 955         UnitActiveState state;
 956         Unit *following;
 957
 958         assert(u);
 959
 960         state = unit_active_state(u);
 961         if (UNIT_IS_INACTIVE_OR_FAILED(state))
 962                 return -EALREADY;
 963
 964         if ((following = unit_following(u))) {
 965                 log_debug("Redirecting stop request from %s to %s.", u->meta.id, following->meta.id);
 966                 return unit_stop(following);
 967         }
 968
 969         if (!UNIT_VTABLE(u)->stop)
 970                 return -EBADR;
 971
 972         unit_add_to_dbus_queue(u);
 973
 974         unit_status_printf(u, NULL, "Stopping %s...", unit_description(u));
 975         return UNIT_VTABLE(u)->stop(u);
 976 }
 977
 978 /* Errors:
 979  *         -EBADR:    This unit type does not support reloading.
 980  *         -ENOEXEC:  Unit is not started.
 981  *         -EAGAIN:   An operation is already in progress. Retry later.
 982  */
 983 int unit_reload(Unit *u) {
 984         UnitActiveState state;
 985         Unit *following;
 986
 987         assert(u);
 988
 989         if (u->meta.load_state != UNIT_LOADED)
 990                 return -EINVAL;
 991
 992         if (!unit_can_reload(u))
 993                 return -EBADR;
 994
 995         state = unit_active_state(u);
 996         if (state == UNIT_RELOADING)
 997                 return -EALREADY;
 998
 999         if (state != UNIT_ACTIVE)
1000                 return -ENOEXEC;
1001
1002         if ((following = unit_following(u))) {
1003                 log_debug("Redirecting reload request from %s to %s.", u->meta.id, following->meta.id);
1004                 return unit_reload(following);
1005         }
1006
1007         unit_add_to_dbus_queue(u);
1008         return UNIT_VTABLE(u)->reload(u);
1009 }
1010
1011 bool unit_can_reload(Unit *u) {
1012         assert(u);
1013
1014         if (!UNIT_VTABLE(u)->reload)
1015                 return false;
1016
1017         if (!UNIT_VTABLE(u)->can_reload)
1018                 return true;
1019
1020         return UNIT_VTABLE(u)->can_reload(u);
1021 }
1022
1023 static void unit_check_unneeded(Unit *u) {
1024         Iterator i;
1025         Unit *other;
1026
1027         assert(u);
1028
1029         /* If this service shall be shut down when unneeded then do
1030          * so. */
1031
1032         if (!u->meta.stop_when_unneeded)
1033                 return;
1034
1035         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
1036                 return;
1037
1038         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
1039                 if (unit_pending_active(other))
1040                         return;
1041
1042         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
1043                 if (unit_pending_active(other))
1044                         return;
1045
1046         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
1047                 if (unit_pending_active(other))
1048                         return;
1049
1050         SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1051                 if (unit_pending_active(other))
1052                         return;
1053
1054         log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
1055
1056         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1057         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
1058 }
1059
1060 static void retroactively_start_dependencies(Unit *u) {
1061         Iterator i;
1062         Unit *other;
1063
1064         assert(u);
1065         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
1066
1067         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1068                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1069                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1070                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1071
1072         SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1073                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1074                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1075                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1076
1077         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1078                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1079                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1080                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1081
1082         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1083                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1084                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1085                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1086
1087         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1088                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1089                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1090                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1091
1092         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
1093                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1094                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1095
1096         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
1097                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1098                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1099 }
1100
1101 static void retroactively_stop_dependencies(Unit *u) {
1102         Iterator i;
1103         Unit *other;
1104
1105         assert(u);
1106         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1107
1108         /* Pull down units which are bound to us recursively if enabled */
1109         SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1110                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1111                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1112 }
1113
1114 static void check_unneeded_dependencies(Unit *u) {
1115         Iterator i;
1116         Unit *other;
1117
1118         assert(u);
1119         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1120
1121         /* Garbage collect services that might not be needed anymore, if enabled */
1122         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1123                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1124                         unit_check_unneeded(other);
1125         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1126                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1127                         unit_check_unneeded(other);
1128         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1129                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1130                         unit_check_unneeded(other);
1131         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1132                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1133                         unit_check_unneeded(other);
1134         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1135                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1136                         unit_check_unneeded(other);
1137         SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1138                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1139                         unit_check_unneeded(other);
1140 }
1141
1142 void unit_trigger_on_failure(Unit *u) {
1143         Unit *other;
1144         Iterator i;
1145
1146         assert(u);
1147
1148         if (set_size(u->meta.dependencies[UNIT_ON_FAILURE]) <= 0)
1149                 return;
1150
1151         log_info("Triggering OnFailure= dependencies of %s.", u->meta.id);
1152
1153         SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i) {
1154                 int r;
1155
1156                 if ((r = manager_add_job(u->meta.manager, JOB_START, other, u->meta.on_failure_isolate ? JOB_ISOLATE : JOB_REPLACE, true, NULL, NULL)) < 0)
1157                         log_error("Failed to enqueue OnFailure= job: %s", strerror(-r));
1158         }
1159 }
1160
1161 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) {
1162         bool unexpected;
1163
1164         assert(u);
1165         assert(os < _UNIT_ACTIVE_STATE_MAX);
1166         assert(ns < _UNIT_ACTIVE_STATE_MAX);
1167
1168         /* Note that this is called for all low-level state changes,
1169          * even if they might map to the same high-level
1170          * UnitActiveState! That means that ns == os is OK an expected
1171          * behaviour here. For example: if a mount point is remounted
1172          * this function will be called too! */
1173
1174         if (u->meta.manager->n_reloading <= 0) {
1175                 dual_timestamp ts;
1176
1177                 dual_timestamp_get(&ts);
1178
1179                 if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1180                         u->meta.inactive_exit_timestamp = ts;
1181                 else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1182                         u->meta.inactive_enter_timestamp = ts;
1183
1184                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1185                         u->meta.active_enter_timestamp = ts;
1186                 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1187                         u->meta.active_exit_timestamp = ts;
1188
1189                 timer_unit_notify(u, ns);
1190                 path_unit_notify(u, ns);
1191         }
1192
1193         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1194                 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1195
1196         if (u->meta.job) {
1197                 unexpected = false;
1198
1199                 if (u->meta.job->state == JOB_WAITING)
1200
1201                         /* So we reached a different state for this
1202                          * job. Let's see if we can run it now if it
1203                          * failed previously due to EAGAIN. */
1204                         job_add_to_run_queue(u->meta.job);
1205
1206                 /* Let's check whether this state change constitutes a
1207                  * finished job, or maybe contradicts a running job and
1208                  * hence needs to invalidate jobs. */
1209
1210                 switch (u->meta.job->type) {
1211
1212                 case JOB_START:
1213                 case JOB_VERIFY_ACTIVE:
1214
1215                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1216                                 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1217                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1218                                 unexpected = true;
1219
1220                                 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1221                                         job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1222                         }
1223
1224                         break;
1225
1226                 case JOB_RELOAD:
1227                 case JOB_RELOAD_OR_START:
1228
1229                         if (u->meta.job->state == JOB_RUNNING) {
1230                                 if (ns == UNIT_ACTIVE)
1231                                         job_finish_and_invalidate(u->meta.job, reload_success ? JOB_DONE : JOB_FAILED);
1232                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1233                                         unexpected = true;
1234
1235                                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1236                                                 job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1237                                 }
1238                         }
1239
1240                         break;
1241
1242                 case JOB_STOP:
1243                 case JOB_RESTART:
1244                 case JOB_TRY_RESTART:
1245
1246                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1247                                 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1248                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1249                                 unexpected = true;
1250                                 job_finish_and_invalidate(u->meta.job, JOB_FAILED);
1251                         }
1252
1253                         break;
1254
1255                 default:
1256                         assert_not_reached("Job type unknown");
1257                 }
1258
1259         } else
1260                 unexpected = true;
1261
1262         if (u->meta.manager->n_reloading <= 0) {
1263
1264                 /* If this state change happened without being
1265                  * requested by a job, then let's retroactively start
1266                  * or stop dependencies. We skip that step when
1267                  * deserializing, since we don't want to create any
1268                  * additional jobs just because something is already
1269                  * activated. */
1270
1271                 if (unexpected) {
1272                         if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1273                                 retroactively_start_dependencies(u);
1274                         else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1275                                 retroactively_stop_dependencies(u);
1276                 }
1277
1278                 /* stop unneeded units regardless if going down was expected or not */
1279                 if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1280                         check_unneeded_dependencies(u);
1281
1282                 if (ns != os && ns == UNIT_FAILED) {
1283                         log_notice("Unit %s entered failed state.", u->meta.id);
1284                         unit_trigger_on_failure(u);
1285                 }
1286         }
1287
1288         /* Some names are special */
1289         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1290
1291                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1292                         /* The bus just might have become available,
1293                          * hence try to connect to it, if we aren't
1294                          * yet connected. */
1295                         bus_init(u->meta.manager, true);
1296
1297                 if (u->meta.type == UNIT_SERVICE &&
1298                     !UNIT_IS_ACTIVE_OR_RELOADING(os) &&
1299                     u->meta.manager->n_reloading <= 0) {
1300                         /* Write audit record if we have just finished starting up */
1301                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, true);
1302                         u->meta.in_audit = true;
1303                 }
1304
1305                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1306                         manager_send_unit_plymouth(u->meta.manager, u);
1307
1308         } else {
1309
1310                 /* We don't care about D-Bus here, since we'll get an
1311                  * asynchronous notification for it anyway. */
1312
1313                 if (u->meta.type == UNIT_SERVICE &&
1314                     UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1315                     !UNIT_IS_INACTIVE_OR_FAILED(os) &&
1316                     u->meta.manager->n_reloading <= 0) {
1317
1318                         /* Hmm, if there was no start record written
1319                          * write it now, so that we always have a nice
1320                          * pair */
1321                         if (!u->meta.in_audit) {
1322                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1323
1324                                 if (ns == UNIT_INACTIVE)
1325                                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1326                         } else
1327                                 /* Write audit record if we have just finished shutting down */
1328                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1329
1330                         u->meta.in_audit = false;
1331                 }
1332         }
1333
1334         manager_recheck_syslog(u->meta.manager);
1335
1336         /* Maybe we finished startup and are now ready for being
1337          * stopped because unneeded? */
1338         unit_check_unneeded(u);
1339
1340         unit_add_to_dbus_queue(u);
1341         unit_add_to_gc_queue(u);
1342 }
1343
1344 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1345         struct epoll_event ev;
1346
1347         assert(u);
1348         assert(fd >= 0);
1349         assert(w);
1350         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1351
1352         zero(ev);
1353         ev.data.ptr = w;
1354         ev.events = events;
1355
1356         if (epoll_ctl(u->meta.manager->epoll_fd,
1357                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1358                       fd,
1359                       &ev) < 0)
1360                 return -errno;
1361
1362         w->fd = fd;
1363         w->type = WATCH_FD;
1364         w->data.unit = u;
1365
1366         return 0;
1367 }
1368
1369 void unit_unwatch_fd(Unit *u, Watch *w) {
1370         assert(u);
1371         assert(w);
1372
1373         if (w->type == WATCH_INVALID)
1374                 return;
1375
1376         assert(w->type == WATCH_FD);
1377         assert(w->data.unit == u);
1378         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1379
1380         w->fd = -1;
1381         w->type = WATCH_INVALID;
1382         w->data.unit = NULL;
1383 }
1384
1385 int unit_watch_pid(Unit *u, pid_t pid) {
1386         assert(u);
1387         assert(pid >= 1);
1388
1389         /* Watch a specific PID. We only support one unit watching
1390          * each PID for now. */
1391
1392         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1393 }
1394
1395 void unit_unwatch_pid(Unit *u, pid_t pid) {
1396         assert(u);
1397         assert(pid >= 1);
1398
1399         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1400 }
1401
1402 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1403         struct itimerspec its;
1404         int flags, fd;
1405         bool ours;
1406
1407         assert(u);
1408         assert(w);
1409         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1410
1411         /* This will try to reuse the old timer if there is one */
1412
1413         if (w->type == WATCH_UNIT_TIMER) {
1414                 assert(w->data.unit == u);
1415                 assert(w->fd >= 0);
1416
1417                 ours = false;
1418                 fd = w->fd;
1419         } else if (w->type == WATCH_INVALID) {
1420
1421                 ours = true;
1422                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1423                         return -errno;
1424         } else
1425                 assert_not_reached("Invalid watch type");
1426
1427         zero(its);
1428
1429         if (delay <= 0) {
1430                 /* Set absolute time in the past, but not 0, since we
1431                  * don't want to disarm the timer */
1432                 its.it_value.tv_sec = 0;
1433                 its.it_value.tv_nsec = 1;
1434
1435                 flags = TFD_TIMER_ABSTIME;
1436         } else {
1437                 timespec_store(&its.it_value, delay);
1438                 flags = 0;
1439         }
1440
1441         /* This will also flush the elapse counter */
1442         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1443                 goto fail;
1444
1445         if (w->type == WATCH_INVALID) {
1446                 struct epoll_event ev;
1447
1448                 zero(ev);
1449                 ev.data.ptr = w;
1450                 ev.events = EPOLLIN;
1451
1452                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1453                         goto fail;
1454         }
1455
1456         w->type = WATCH_UNIT_TIMER;
1457         w->fd = fd;
1458         w->data.unit = u;
1459
1460         return 0;
1461
1462 fail:
1463         if (ours)
1464                 close_nointr_nofail(fd);
1465
1466         return -errno;
1467 }
1468
1469 void unit_unwatch_timer(Unit *u, Watch *w) {
1470         assert(u);
1471         assert(w);
1472
1473         if (w->type == WATCH_INVALID)
1474                 return;
1475
1476         assert(w->type == WATCH_UNIT_TIMER);
1477         assert(w->data.unit == u);
1478         assert(w->fd >= 0);
1479
1480         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1481         close_nointr_nofail(w->fd);
1482
1483         w->fd = -1;
1484         w->type = WATCH_INVALID;
1485         w->data.unit = NULL;
1486 }
1487
1488 bool unit_job_is_applicable(Unit *u, JobType j) {
1489         assert(u);
1490         assert(j >= 0 && j < _JOB_TYPE_MAX);
1491
1492         switch (j) {
1493
1494         case JOB_VERIFY_ACTIVE:
1495         case JOB_START:
1496         case JOB_STOP:
1497                 return true;
1498
1499         case JOB_RESTART:
1500         case JOB_TRY_RESTART:
1501                 return unit_can_start(u);
1502
1503         case JOB_RELOAD:
1504                 return unit_can_reload(u);
1505
1506         case JOB_RELOAD_OR_START:
1507                 return unit_can_reload(u) && unit_can_start(u);
1508
1509         default:
1510                 assert_not_reached("Invalid job type");
1511         }
1512 }
1513
1514 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1515
1516         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1517                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1518                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1519                 [UNIT_WANTS] = UNIT_WANTED_BY,
1520                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1521                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1522                 [UNIT_BIND_TO] = UNIT_BOUND_BY,
1523                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1524                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1525                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1526                 [UNIT_BOUND_BY] = UNIT_BIND_TO,
1527                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1528                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1529                 [UNIT_BEFORE] = UNIT_AFTER,
1530                 [UNIT_AFTER] = UNIT_BEFORE,
1531                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1532                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1533                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1534         };
1535         int r, q = 0, v = 0, w = 0;
1536
1537         assert(u);
1538         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1539         assert(other);
1540
1541         u = unit_follow_merge(u);
1542         other = unit_follow_merge(other);
1543
1544         /* We won't allow dependencies on ourselves. We will not
1545          * consider them an error however. */
1546         if (u == other)
1547                 return 0;
1548
1549         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1550                 return r;
1551
1552         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1553                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1554                         return r;
1555
1556         if (add_reference)
1557                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1558                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1559                         return r;
1560
1561         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1562                 return q;
1563
1564         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1565                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1566                         r = v;
1567                         goto fail;
1568                 }
1569
1570         if (add_reference) {
1571                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1572                         r = w;
1573                         goto fail;
1574                 }
1575
1576                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1577                         goto fail;
1578         }
1579
1580         unit_add_to_dbus_queue(u);
1581         return 0;
1582
1583 fail:
1584         if (q > 0)
1585                 set_remove(u->meta.dependencies[d], other);
1586
1587         if (v > 0)
1588                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1589
1590         if (w > 0)
1591                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1592
1593         return r;
1594 }
1595
1596 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1597         int r;
1598
1599         assert(u);
1600
1601         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1602                 return r;
1603
1604         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1605                 return r;
1606
1607         return 0;
1608 }
1609
1610 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1611         char *s;
1612
1613         assert(u);
1614         assert(name || path);
1615
1616         if (!name)
1617                 name = file_name_from_path(path);
1618
1619         if (!unit_name_is_template(name)) {
1620                 *p = NULL;
1621                 return name;
1622         }
1623
1624         if (u->meta.instance)
1625                 s = unit_name_replace_instance(name, u->meta.instance);
1626         else {
1627                 char *i;
1628
1629                 if (!(i = unit_name_to_prefix(u->meta.id)))
1630                         return NULL;
1631
1632                 s = unit_name_replace_instance(name, i);
1633                 free(i);
1634         }
1635
1636         if (!s)
1637                 return NULL;
1638
1639         *p = s;
1640         return s;
1641 }
1642
1643 int unit_add_dependency_by_name(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(u, d, other, add_reference);
1658
1659 finish:
1660         free(s);
1661         return r;
1662 }
1663
1664 int unit_add_two_dependencies_by_name(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         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1679
1680 finish:
1681         free(s);
1682         return r;
1683 }
1684
1685 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1686         Unit *other;
1687         int r;
1688         char *s;
1689
1690         assert(u);
1691         assert(name || path);
1692
1693         if (!(name = resolve_template(u, name, path, &s)))
1694                 return -ENOMEM;
1695
1696         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1697                 goto finish;
1698
1699         r = unit_add_dependency(other, d, u, add_reference);
1700
1701 finish:
1702         free(s);
1703         return r;
1704 }
1705
1706 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1707         Unit *other;
1708         int r;
1709         char *s;
1710
1711         assert(u);
1712         assert(name || path);
1713
1714         if (!(name = resolve_template(u, name, path, &s)))
1715                 return -ENOMEM;
1716
1717         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1718                 goto finish;
1719
1720         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1721                 goto finish;
1722
1723 finish:
1724         free(s);
1725         return r;
1726 }
1727
1728 int set_unit_path(const char *p) {
1729         char *cwd, *c;
1730         int r;
1731
1732         /* This is mostly for debug purposes */
1733
1734         if (path_is_absolute(p)) {
1735                 if (!(c = strdup(p)))
1736                         return -ENOMEM;
1737         } else {
1738                 if (!(cwd = get_current_dir_name()))
1739                         return -errno;
1740
1741                 r = asprintf(&c, "%s/%s", cwd, p);
1742                 free(cwd);
1743
1744                 if (r < 0)
1745                         return -ENOMEM;
1746         }
1747
1748         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1749                 r = -errno;
1750                 free(c);
1751                 return r;
1752         }
1753
1754         return 0;
1755 }
1756
1757 char *unit_dbus_path(Unit *u) {
1758         char *p, *e;
1759
1760         assert(u);
1761
1762         if (!u->meta.id)
1763                 return NULL;
1764
1765         if (!(e = bus_path_escape(u->meta.id)))
1766                 return NULL;
1767
1768         p = strappend("/org/freedesktop/systemd1/unit/", e);
1769         free(e);
1770
1771         return p;
1772 }
1773
1774 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1775         int r;
1776
1777         assert(u);
1778         assert(b);
1779
1780         assert(b->path);
1781
1782         if (!b->controller) {
1783                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1784                         return -ENOMEM;
1785
1786                 b->ours = true;
1787         }
1788
1789         /* Ensure this hasn't been added yet */
1790         assert(!b->unit);
1791
1792         if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
1793                 CGroupBonding *l;
1794
1795                 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1796                 LIST_PREPEND(CGroupBonding, by_path, l, b);
1797
1798                 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1799                         LIST_REMOVE(CGroupBonding, by_path, l, b);
1800                         return r;
1801                 }
1802         }
1803
1804         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1805         b->unit = u;
1806
1807         return 0;
1808 }
1809
1810 static char *default_cgroup_path(Unit *u) {
1811         char *p;
1812
1813         assert(u);
1814
1815         if (u->meta.instance) {
1816                 char *t;
1817
1818                 t = unit_name_template(u->meta.id);
1819                 if (!t)
1820                         return NULL;
1821
1822                 p = join(u->meta.manager->cgroup_hierarchy, "/", t, "/", u->meta.instance, NULL);
1823                 free(t);
1824         } else
1825                 p = join(u->meta.manager->cgroup_hierarchy, "/", u->meta.id, NULL);
1826
1827         return p;
1828 }
1829
1830 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1831         char *controller = NULL, *path = NULL;
1832         CGroupBonding *b = NULL;
1833         bool ours = false;
1834         int r;
1835
1836         assert(u);
1837         assert(name);
1838
1839         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1840                 return r;
1841
1842         if (!path) {
1843                 path = default_cgroup_path(u);
1844                 ours = true;
1845         }
1846
1847         if (!controller) {
1848                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1849                 ours = true;
1850         }
1851
1852         if (!path || !controller) {
1853                 free(path);
1854                 free(controller);
1855
1856                 return -ENOMEM;
1857         }
1858
1859         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1860                 r = -EEXIST;
1861                 goto fail;
1862         }
1863
1864         if (!(b = new0(CGroupBonding, 1))) {
1865                 r = -ENOMEM;
1866                 goto fail;
1867         }
1868
1869         b->controller = controller;
1870         b->path = path;
1871         b->ours = ours;
1872         b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1873
1874         if ((r = unit_add_cgroup(u, b)) < 0)
1875                 goto fail;
1876
1877         return 0;
1878
1879 fail:
1880         free(path);
1881         free(controller);
1882         free(b);
1883
1884         return r;
1885 }
1886
1887 static int unit_add_one_default_cgroup(Unit *u, const char *controller) {
1888         CGroupBonding *b = NULL;
1889         int r = -ENOMEM;
1890
1891         assert(u);
1892
1893         if (!controller)
1894                 controller = SYSTEMD_CGROUP_CONTROLLER;
1895
1896         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller))
1897                 return 0;
1898
1899         if (!(b = new0(CGroupBonding, 1)))
1900                 return -ENOMEM;
1901
1902         if (!(b->controller = strdup(controller)))
1903                 goto fail;
1904
1905         if (!(b->path = default_cgroup_path(u)))
1906                 goto fail;
1907
1908         b->ours = true;
1909         b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1910
1911         if ((r = unit_add_cgroup(u, b)) < 0)
1912                 goto fail;
1913
1914         return 0;
1915
1916 fail:
1917         free(b->path);
1918         free(b->controller);
1919         free(b);
1920
1921         return r;
1922 }
1923
1924 int unit_add_default_cgroups(Unit *u) {
1925         CGroupAttribute *a;
1926         char **c;
1927         int r;
1928
1929         assert(u);
1930
1931         /* Adds in the default cgroups, if they weren't specified
1932          * otherwise. */
1933
1934         if (!u->meta.manager->cgroup_hierarchy)
1935                 return 0;
1936
1937         if ((r = unit_add_one_default_cgroup(u, NULL)) < 0)
1938                 return r;
1939
1940         STRV_FOREACH(c, u->meta.manager->default_controllers)
1941                 unit_add_one_default_cgroup(u, *c);
1942
1943         LIST_FOREACH(by_unit, a, u->meta.cgroup_attributes)
1944                 unit_add_one_default_cgroup(u, a->controller);
1945
1946         return 0;
1947 }
1948
1949 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1950         assert(u);
1951
1952         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1953 }
1954
1955 int unit_add_cgroup_attribute(Unit *u, const char *controller, const char *name, const char *value, CGroupAttributeMapCallback map_callback) {
1956         int r;
1957         char *c = NULL;
1958         CGroupAttribute *a;
1959
1960         assert(u);
1961         assert(name);
1962         assert(value);
1963
1964         if (!controller) {
1965                 const char *dot;
1966
1967                 dot = strchr(name, '.');
1968                 if (!dot)
1969                         return -EINVAL;
1970
1971                 c = strndup(name, dot - name);
1972                 if (!c)
1973                         return -ENOMEM;
1974
1975                 controller = c;
1976         }
1977
1978         if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) {
1979                 r = -EINVAL;
1980                 goto finish;
1981         }
1982
1983         a = new0(CGroupAttribute, 1);
1984         if (!a) {
1985                 r = -ENOMEM;
1986                 goto finish;
1987         }
1988
1989         if (c) {
1990                 a->controller = c;
1991                 c = NULL;
1992         } else
1993                 a->controller = strdup(controller);
1994
1995         a->name = strdup(name);
1996         a->value = strdup(value);
1997
1998         if (!a->controller || !a->name || !a->value) {
1999                 free(a->controller);
2000                 free(a->name);
2001                 free(a->value);
2002                 free(a);
2003
2004                 return -ENOMEM;
2005         }
2006
2007         a->map_callback = map_callback;
2008
2009         LIST_PREPEND(CGroupAttribute, by_unit, u->meta.cgroup_attributes, a);
2010
2011         r = 0;
2012
2013 finish:
2014         free(c);
2015         return r;
2016 }
2017
2018 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
2019         char *t;
2020         int r;
2021
2022         assert(u);
2023         assert(type);
2024         assert(_found);
2025
2026         if (!(t = unit_name_change_suffix(u->meta.id, type)))
2027                 return -ENOMEM;
2028
2029         assert(!unit_has_name(u, t));
2030
2031         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
2032         free(t);
2033
2034         assert(r < 0 || *_found != u);
2035
2036         return r;
2037 }
2038
2039 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
2040         Unit *found;
2041         char *t;
2042
2043         assert(u);
2044         assert(type);
2045         assert(_found);
2046
2047         if (!(t = unit_name_change_suffix(u->meta.id, type)))
2048                 return -ENOMEM;
2049
2050         assert(!unit_has_name(u, t));
2051
2052         found = manager_get_unit(u->meta.manager, t);
2053         free(t);
2054
2055         if (!found)
2056                 return -ENOENT;
2057
2058         *_found = found;
2059         return 0;
2060 }
2061
2062 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
2063         Unit *u = userdata;
2064         assert(u);
2065
2066         return unit_name_to_prefix_and_instance(u->meta.id);
2067 }
2068
2069 static char *specifier_prefix(char specifier, void *data, void *userdata) {
2070         Unit *u = userdata;
2071         assert(u);
2072
2073         return unit_name_to_prefix(u->meta.id);
2074 }
2075
2076 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
2077         Unit *u = userdata;
2078         char *p, *r;
2079
2080         assert(u);
2081
2082         if (!(p = unit_name_to_prefix(u->meta.id)))
2083                 return NULL;
2084
2085         r = unit_name_unescape(p);
2086         free(p);
2087
2088         return r;
2089 }
2090
2091 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
2092         Unit *u = userdata;
2093         assert(u);
2094
2095         if (u->meta.instance)
2096                 return unit_name_unescape(u->meta.instance);
2097
2098         return strdup("");
2099 }
2100
2101 static char *specifier_filename(char specifier, void *data, void *userdata) {
2102         Unit *u = userdata;
2103         assert(u);
2104
2105         if (u->meta.instance)
2106                 return unit_name_path_unescape(u->meta.instance);
2107
2108         return unit_name_to_path(u->meta.instance);
2109 }
2110
2111 static char *specifier_cgroup(char specifier, void *data, void *userdata) {
2112         Unit *u = userdata;
2113         assert(u);
2114
2115         return default_cgroup_path(u);
2116 }
2117
2118 static char *specifier_cgroup_root(char specifier, void *data, void *userdata) {
2119         Unit *u = userdata;
2120         char *p;
2121         assert(u);
2122
2123         if (specifier == 'r')
2124                 return strdup(u->meta.manager->cgroup_hierarchy);
2125
2126         if (parent_of_path(u->meta.manager->cgroup_hierarchy, &p) < 0)
2127                 return strdup("");
2128
2129         if (streq(p, "/")) {
2130                 free(p);
2131                 return strdup("");
2132         }
2133
2134         return p;
2135 }
2136
2137 static char *specifier_runtime(char specifier, void *data, void *userdata) {
2138         Unit *u = userdata;
2139         assert(u);
2140
2141         if (u->meta.manager->running_as == MANAGER_USER) {
2142                 const char *e;
2143
2144                 e = getenv("XDG_RUNTIME_DIR");
2145                 if (e)
2146                         return strdup(e);
2147         }
2148
2149         return strdup("/run");
2150 }
2151
2152 char *unit_name_printf(Unit *u, const char* format) {
2153
2154         /*
2155          * This will use the passed string as format string and
2156          * replace the following specifiers:
2157          *
2158          * %n: the full id of the unit                 (foo@bar.waldo)
2159          * %N: the id of the unit without the suffix   (foo@bar)
2160          * %p: the prefix                              (foo)
2161          * %i: the instance                            (bar)
2162          */
2163
2164         const Specifier table[] = {
2165                 { 'n', specifier_string,              u->meta.id },
2166                 { 'N', specifier_prefix_and_instance, NULL },
2167                 { 'p', specifier_prefix,              NULL },
2168                 { 'i', specifier_string,              u->meta.instance },
2169                 { 0, NULL, NULL }
2170         };
2171
2172         assert(u);
2173         assert(format);
2174
2175         return specifier_printf(format, table, u);
2176 }
2177
2178 char *unit_full_printf(Unit *u, const char *format) {
2179
2180         /* This is similar to unit_name_printf() but also supports
2181          * unescaping. Also, adds a couple of additional codes:
2182          *
2183          * %c cgroup path of unit
2184          * %r root cgroup path of this systemd instance (e.g. "/user/lennart/shared/systemd-4711")
2185          * %R parent of root cgroup path (e.g. "/usr/lennart/shared")
2186          * %t the runtime directory to place sockets in (e.g. "/run" or $XDG_RUNTIME_DIR)
2187          */
2188
2189         const Specifier table[] = {
2190                 { 'n', specifier_string,              u->meta.id },
2191                 { 'N', specifier_prefix_and_instance, NULL },
2192                 { 'p', specifier_prefix,              NULL },
2193                 { 'P', specifier_prefix_unescaped,    NULL },
2194                 { 'i', specifier_string,              u->meta.instance },
2195                 { 'I', specifier_instance_unescaped,  NULL },
2196                 { 'f', specifier_filename,            NULL },
2197                 { 'c', specifier_cgroup,              NULL },
2198                 { 'r', specifier_cgroup_root,         NULL },
2199                 { 'R', specifier_cgroup_root,         NULL },
2200                 { 't', specifier_runtime,             NULL },
2201                 { 0, NULL, NULL }
2202         };
2203
2204         assert(u);
2205         assert(format);
2206
2207         return specifier_printf(format, table, u);
2208 }
2209
2210 char **unit_full_printf_strv(Unit *u, char **l) {
2211         size_t n;
2212         char **r, **i, **j;
2213
2214         /* Applies unit_full_printf to every entry in l */
2215
2216         assert(u);
2217
2218         n = strv_length(l);
2219         if (!(r = new(char*, n+1)))
2220                 return NULL;
2221
2222         for (i = l, j = r; *i; i++, j++)
2223                 if (!(*j = unit_full_printf(u, *i)))
2224                         goto fail;
2225
2226         *j = NULL;
2227         return r;
2228
2229 fail:
2230         for (j--; j >= r; j--)
2231                 free(*j);
2232
2233         free(r);
2234
2235         return NULL;
2236 }
2237
2238 int unit_watch_bus_name(Unit *u, const char *name) {
2239         assert(u);
2240         assert(name);
2241
2242         /* Watch a specific name on the bus. We only support one unit
2243          * watching each name for now. */
2244
2245         return hashmap_put(u->meta.manager->watch_bus, name, u);
2246 }
2247
2248 void unit_unwatch_bus_name(Unit *u, const char *name) {
2249         assert(u);
2250         assert(name);
2251
2252         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
2253 }
2254
2255 bool unit_can_serialize(Unit *u) {
2256         assert(u);
2257
2258         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
2259 }
2260
2261 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
2262         int r;
2263
2264         assert(u);
2265         assert(f);
2266         assert(fds);
2267
2268         if (!unit_can_serialize(u))
2269                 return 0;
2270
2271         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
2272                 return r;
2273
2274         if (u->meta.job)
2275                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
2276
2277         dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->meta.inactive_exit_timestamp);
2278         dual_timestamp_serialize(f, "active-enter-timestamp", &u->meta.active_enter_timestamp);
2279         dual_timestamp_serialize(f, "active-exit-timestamp", &u->meta.active_exit_timestamp);
2280         dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->meta.inactive_enter_timestamp);
2281         dual_timestamp_serialize(f, "condition-timestamp", &u->meta.condition_timestamp);
2282
2283         if (dual_timestamp_is_set(&u->meta.condition_timestamp))
2284                 unit_serialize_item(u, f, "condition-result", yes_no(u->meta.condition_result));
2285
2286         /* End marker */
2287         fputc('\n', f);
2288         return 0;
2289 }
2290
2291 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2292         va_list ap;
2293
2294         assert(u);
2295         assert(f);
2296         assert(key);
2297         assert(format);
2298
2299         fputs(key, f);
2300         fputc('=', f);
2301
2302         va_start(ap, format);
2303         vfprintf(f, format, ap);
2304         va_end(ap);
2305
2306         fputc('\n', f);
2307 }
2308
2309 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2310         assert(u);
2311         assert(f);
2312         assert(key);
2313         assert(value);
2314
2315         fprintf(f, "%s=%s\n", key, value);
2316 }
2317
2318 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2319         int r;
2320
2321         assert(u);
2322         assert(f);
2323         assert(fds);
2324
2325         if (!unit_can_serialize(u))
2326                 return 0;
2327
2328         for (;;) {
2329                 char line[LINE_MAX], *l, *v;
2330                 size_t k;
2331
2332                 if (!fgets(line, sizeof(line), f)) {
2333                         if (feof(f))
2334                                 return 0;
2335                         return -errno;
2336                 }
2337
2338                 char_array_0(line);
2339                 l = strstrip(line);
2340
2341                 /* End marker */
2342                 if (l[0] == 0)
2343                         return 0;
2344
2345                 k = strcspn(l, "=");
2346
2347                 if (l[k] == '=') {
2348                         l[k] = 0;
2349                         v = l+k+1;
2350                 } else
2351                         v = l+k;
2352
2353                 if (streq(l, "job")) {
2354                         JobType type;
2355
2356                         if ((type = job_type_from_string(v)) < 0)
2357                                 log_debug("Failed to parse job type value %s", v);
2358                         else
2359                                 u->meta.deserialized_job = type;
2360
2361                         continue;
2362                 } else if (streq(l, "inactive-exit-timestamp")) {
2363                         dual_timestamp_deserialize(v, &u->meta.inactive_exit_timestamp);
2364                         continue;
2365                 } else if (streq(l, "active-enter-timestamp")) {
2366                         dual_timestamp_deserialize(v, &u->meta.active_enter_timestamp);
2367                         continue;
2368                 } else if (streq(l, "active-exit-timestamp")) {
2369                         dual_timestamp_deserialize(v, &u->meta.active_exit_timestamp);
2370                         continue;
2371                 } else if (streq(l, "inactive-enter-timestamp")) {
2372                         dual_timestamp_deserialize(v, &u->meta.inactive_enter_timestamp);
2373                         continue;
2374                 } else if (streq(l, "condition-timestamp")) {
2375                         dual_timestamp_deserialize(v, &u->meta.condition_timestamp);
2376                         continue;
2377                 } else if (streq(l, "condition-result")) {
2378                         int b;
2379
2380                         if ((b = parse_boolean(v)) < 0)
2381                                 log_debug("Failed to parse condition result value %s", v);
2382                         else
2383                                 u->meta.condition_result = b;
2384
2385                         continue;
2386                 }
2387
2388                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2389                         return r;
2390         }
2391 }
2392
2393 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2394         Unit *device;
2395         char *e;
2396         int r;
2397
2398         assert(u);
2399
2400         if (!what)
2401                 return 0;
2402
2403         /* Adds in links to the device node that this unit is based on */
2404
2405         if (!is_device_path(what))
2406                 return 0;
2407
2408         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2409                 return -ENOMEM;
2410
2411         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2412         free(e);
2413
2414         if (r < 0)
2415                 return r;
2416
2417         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BIND_TO, device, true)) < 0)
2418                 return r;
2419
2420         if (wants)
2421                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2422                         return r;
2423
2424         return 0;
2425 }
2426
2427 int unit_coldplug(Unit *u) {
2428         int r;
2429
2430         assert(u);
2431
2432         if (UNIT_VTABLE(u)->coldplug)
2433                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2434                         return r;
2435
2436         if (u->meta.deserialized_job >= 0) {
2437                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_IGNORE_REQUIREMENTS, false, NULL, NULL)) < 0)
2438                         return r;
2439
2440                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2441         }
2442
2443         return 0;
2444 }
2445
2446 void unit_status_printf(Unit *u, const char *status, const char *format, ...) {
2447         va_list ap;
2448
2449         assert(u);
2450         assert(format);
2451
2452         if (!UNIT_VTABLE(u)->show_status)
2453                 return;
2454
2455         if (!manager_get_show_status(u->meta.manager))
2456                 return;
2457
2458         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2459                 return;
2460
2461         va_start(ap, format);
2462         status_vprintf(status, true, format, ap);
2463         va_end(ap);
2464 }
2465
2466 bool unit_need_daemon_reload(Unit *u) {
2467         assert(u);
2468
2469         if (u->meta.fragment_path) {
2470                 struct stat st;
2471
2472                 zero(st);
2473                 if (stat(u->meta.fragment_path, &st) < 0)
2474                         /* What, cannot access this anymore? */
2475                         return true;
2476
2477                 if (u->meta.fragment_mtime > 0 &&
2478                     timespec_load(&st.st_mtim) != u->meta.fragment_mtime)
2479                         return true;
2480         }
2481
2482         if (UNIT_VTABLE(u)->need_daemon_reload)
2483                 return UNIT_VTABLE(u)->need_daemon_reload(u);
2484
2485         return false;
2486 }
2487
2488 void unit_reset_failed(Unit *u) {
2489         assert(u);
2490
2491         if (UNIT_VTABLE(u)->reset_failed)
2492                 UNIT_VTABLE(u)->reset_failed(u);
2493 }
2494
2495 Unit *unit_following(Unit *u) {
2496         assert(u);
2497
2498         if (UNIT_VTABLE(u)->following)
2499                 return UNIT_VTABLE(u)->following(u);
2500
2501         return NULL;
2502 }
2503
2504 bool unit_pending_inactive(Unit *u) {
2505         assert(u);
2506
2507         /* Returns true if the unit is inactive or going down */
2508
2509         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2510                 return true;
2511
2512         if (u->meta.job && u->meta.job->type == JOB_STOP)
2513                 return true;
2514
2515         return false;
2516 }
2517
2518 bool unit_pending_active(Unit *u) {
2519         assert(u);
2520
2521         /* Returns true if the unit is active or going up */
2522
2523         if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2524                 return true;
2525
2526         if (u->meta.job &&
2527             (u->meta.job->type == JOB_START ||
2528              u->meta.job->type == JOB_RELOAD_OR_START ||
2529              u->meta.job->type == JOB_RESTART))
2530                 return true;
2531
2532         return false;
2533 }
2534
2535 UnitType unit_name_to_type(const char *n) {
2536         UnitType t;
2537
2538         assert(n);
2539
2540         for (t = 0; t < _UNIT_TYPE_MAX; t++)
2541                 if (endswith(n, unit_vtable[t]->suffix))
2542                         return t;
2543
2544         return _UNIT_TYPE_INVALID;
2545 }
2546
2547 bool unit_name_is_valid(const char *n, bool template_ok) {
2548         UnitType t;
2549
2550         t = unit_name_to_type(n);
2551         if (t < 0 || t >= _UNIT_TYPE_MAX)
2552                 return false;
2553
2554         return unit_name_is_valid_no_type(n, template_ok);
2555 }
2556
2557 int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error) {
2558         assert(u);
2559         assert(w >= 0 && w < _KILL_WHO_MAX);
2560         assert(m >= 0 && m < _KILL_MODE_MAX);
2561         assert(signo > 0);
2562         assert(signo < _NSIG);
2563
2564         if (m == KILL_NONE)
2565                 return 0;
2566
2567         if (!UNIT_VTABLE(u)->kill)
2568                 return -ENOTSUP;
2569
2570         return UNIT_VTABLE(u)->kill(u, w, m, signo, error);
2571 }
2572
2573 int unit_following_set(Unit *u, Set **s) {
2574         assert(u);
2575         assert(s);
2576
2577         if (UNIT_VTABLE(u)->following_set)
2578                 return UNIT_VTABLE(u)->following_set(u, s);
2579
2580         *s = NULL;
2581         return 0;
2582 }
2583
2584 UnitFileState unit_get_unit_file_state(Unit *u) {
2585         assert(u);
2586
2587         if (u->meta.unit_file_state < 0 && u->meta.fragment_path)
2588                 u->meta.unit_file_state = unit_file_get_state(
2589                                 u->meta.manager->running_as == MANAGER_SYSTEM ? UNIT_FILE_SYSTEM : UNIT_FILE_USER,
2590                                 NULL, file_name_from_path(u->meta.fragment_path));
2591
2592         return u->meta.unit_file_state;
2593 }
2594
2595 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2596         [UNIT_STUB] = "stub",
2597         [UNIT_LOADED] = "loaded",
2598         [UNIT_ERROR] = "error",
2599         [UNIT_MERGED] = "merged",
2600         [UNIT_MASKED] = "masked"
2601 };
2602
2603 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2604
2605 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2606         [UNIT_ACTIVE] = "active",
2607         [UNIT_RELOADING] = "reloading",
2608         [UNIT_INACTIVE] = "inactive",
2609         [UNIT_FAILED] = "failed",
2610         [UNIT_ACTIVATING] = "activating",
2611         [UNIT_DEACTIVATING] = "deactivating"
2612 };
2613
2614 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2615
2616 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2617         [UNIT_REQUIRES] = "Requires",
2618         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2619         [UNIT_WANTS] = "Wants",
2620         [UNIT_REQUISITE] = "Requisite",
2621         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2622         [UNIT_REQUIRED_BY] = "RequiredBy",
2623         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2624         [UNIT_BIND_TO] = "BindTo",
2625         [UNIT_WANTED_BY] = "WantedBy",
2626         [UNIT_CONFLICTS] = "Conflicts",
2627         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2628         [UNIT_BOUND_BY] = "BoundBy",
2629         [UNIT_BEFORE] = "Before",
2630         [UNIT_AFTER] = "After",
2631         [UNIT_REFERENCES] = "References",
2632         [UNIT_REFERENCED_BY] = "ReferencedBy",
2633         [UNIT_ON_FAILURE] = "OnFailure"
2634 };
2635
2636 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);