src/job.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 <sys/timerfd.h>
  25 #include <sys/epoll.h>
  26
  27 #include "set.h"
  28 #include "unit.h"
  29 #include "macro.h"
  30 #include "strv.h"
  31 #include "load-fragment.h"
  32 #include "load-dropin.h"
  33 #include "log.h"
  34 #include "dbus-job.h"
  35
  36 Job* job_new(Manager *m, JobType type, Unit *unit) {
  37         Job *j;
  38
  39         assert(m);
  40         assert(type < _JOB_TYPE_MAX);
  41         assert(unit);
  42
  43         if (!(j = new0(Job, 1)))
  44                 return NULL;
  45
  46         j->manager = m;
  47         j->id = m->current_job_id++;
  48         j->type = type;
  49         j->unit = unit;
  50
  51         j->timer_watch.type = WATCH_INVALID;
  52
  53         /* We don't link it here, that's what job_dependency() is for */
  54
  55         return j;
  56 }
  57
  58 void job_free(Job *j) {
  59         assert(j);
  60
  61         /* Detach from next 'bigger' objects */
  62         if (j->installed) {
  63                 bus_job_send_removed_signal(j);
  64
  65                 if (j->unit->job == j) {
  66                         j->unit->job = NULL;
  67                         unit_add_to_gc_queue(j->unit);
  68                 }
  69
  70                 hashmap_remove(j->manager->jobs, UINT32_TO_PTR(j->id));
  71                 j->installed = false;
  72         }
  73
  74         /* Detach from next 'smaller' objects */
  75         manager_transaction_unlink_job(j->manager, j, true);
  76
  77         if (j->in_run_queue)
  78                 LIST_REMOVE(Job, run_queue, j->manager->run_queue, j);
  79
  80         if (j->in_dbus_queue)
  81                 LIST_REMOVE(Job, dbus_queue, j->manager->dbus_job_queue, j);
  82
  83         if (j->timer_watch.type != WATCH_INVALID) {
  84                 assert(j->timer_watch.type == WATCH_JOB_TIMER);
  85                 assert(j->timer_watch.data.job == j);
  86                 assert(j->timer_watch.fd >= 0);
  87
  88                 assert_se(epoll_ctl(j->manager->epoll_fd, EPOLL_CTL_DEL, j->timer_watch.fd, NULL) >= 0);
  89                 close_nointr_nofail(j->timer_watch.fd);
  90         }
  91
  92         free(j->bus_client);
  93         free(j);
  94 }
  95
  96 JobDependency* job_dependency_new(Job *subject, Job *object, bool matters, bool conflicts) {
  97         JobDependency *l;
  98
  99         assert(object);
 100
 101         /* Adds a new job link, which encodes that the 'subject' job
 102          * needs the 'object' job in some way. If 'subject' is NULL
 103          * this means the 'anchor' job (i.e. the one the user
 104          * explicitly asked for) is the requester. */
 105
 106         if (!(l = new0(JobDependency, 1)))
 107                 return NULL;
 108
 109         l->subject = subject;
 110         l->object = object;
 111         l->matters = matters;
 112         l->conflicts = conflicts;
 113
 114         if (subject)
 115                 LIST_PREPEND(JobDependency, subject, subject->subject_list, l);
 116         else
 117                 LIST_PREPEND(JobDependency, subject, object->manager->transaction_anchor, l);
 118
 119         LIST_PREPEND(JobDependency, object, object->object_list, l);
 120
 121         return l;
 122 }
 123
 124 void job_dependency_free(JobDependency *l) {
 125         assert(l);
 126
 127         if (l->subject)
 128                 LIST_REMOVE(JobDependency, subject, l->subject->subject_list, l);
 129         else
 130                 LIST_REMOVE(JobDependency, subject, l->object->manager->transaction_anchor, l);
 131
 132         LIST_REMOVE(JobDependency, object, l->object->object_list, l);
 133
 134         free(l);
 135 }
 136
 137 void job_dump(Job *j, FILE*f, const char *prefix) {
 138         assert(j);
 139         assert(f);
 140
 141         if (!prefix)
 142                 prefix = "";
 143
 144         fprintf(f,
 145                 "%s-> Job %u:\n"
 146                 "%s\tAction: %s -> %s\n"
 147                 "%s\tState: %s\n"
 148                 "%s\tForced: %s\n",
 149                 prefix, j->id,
 150                 prefix, j->unit->id, job_type_to_string(j->type),
 151                 prefix, job_state_to_string(j->state),
 152                 prefix, yes_no(j->override));
 153 }
 154
 155 bool job_is_anchor(Job *j) {
 156         JobDependency *l;
 157
 158         assert(j);
 159
 160         LIST_FOREACH(object, l, j->object_list)
 161                 if (!l->subject)
 162                         return true;
 163
 164         return false;
 165 }
 166
 167 static bool types_match(JobType a, JobType b, JobType c, JobType d) {
 168         return
 169                 (a == c && b == d) ||
 170                 (a == d && b == c);
 171 }
 172
 173 int job_type_merge(JobType *a, JobType b) {
 174         if (*a == b)
 175                 return 0;
 176
 177         /* Merging is associative! a merged with b merged with c is
 178          * the same as a merged with c merged with b. */
 179
 180         /* Mergeability is transitive! if a can be merged with b and b
 181          * with c then a also with c */
 182
 183         /* Also, if a merged with b cannot be merged with c, then
 184          * either a or b cannot be merged with c either */
 185
 186         if (types_match(*a, b, JOB_START, JOB_VERIFY_ACTIVE))
 187                 *a = JOB_START;
 188         else if (types_match(*a, b, JOB_START, JOB_RELOAD) ||
 189                  types_match(*a, b, JOB_START, JOB_RELOAD_OR_START) ||
 190                  types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_RELOAD_OR_START) ||
 191                  types_match(*a, b, JOB_RELOAD, JOB_RELOAD_OR_START))
 192                 *a = JOB_RELOAD_OR_START;
 193         else if (types_match(*a, b, JOB_START, JOB_RESTART) ||
 194                  types_match(*a, b, JOB_START, JOB_TRY_RESTART) ||
 195                  types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_RESTART) ||
 196                  types_match(*a, b, JOB_RELOAD, JOB_RESTART) ||
 197                  types_match(*a, b, JOB_RELOAD_OR_START, JOB_RESTART) ||
 198                  types_match(*a, b, JOB_RELOAD_OR_START, JOB_TRY_RESTART) ||
 199                  types_match(*a, b, JOB_RESTART, JOB_TRY_RESTART))
 200                 *a = JOB_RESTART;
 201         else if (types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_RELOAD))
 202                 *a = JOB_RELOAD;
 203         else if (types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_TRY_RESTART) ||
 204                  types_match(*a, b, JOB_RELOAD, JOB_TRY_RESTART))
 205                 *a = JOB_TRY_RESTART;
 206         else
 207                 return -EEXIST;
 208
 209         return 0;
 210 }
 211
 212 bool job_type_is_mergeable(JobType a, JobType b) {
 213         return job_type_merge(&a, b) >= 0;
 214 }
 215
 216 bool job_type_is_superset(JobType a, JobType b) {
 217
 218         /* Checks whether operation a is a "superset" of b in its
 219          * actions */
 220
 221         if (a == b)
 222                 return true;
 223
 224         switch (a) {
 225                 case JOB_START:
 226                         return b == JOB_VERIFY_ACTIVE;
 227
 228                 case JOB_RELOAD:
 229                         return
 230                                 b == JOB_VERIFY_ACTIVE;
 231
 232                 case JOB_RELOAD_OR_START:
 233                         return
 234                                 b == JOB_RELOAD ||
 235                                 b == JOB_START ||
 236                                 b == JOB_VERIFY_ACTIVE;
 237
 238                 case JOB_RESTART:
 239                         return
 240                                 b == JOB_START ||
 241                                 b == JOB_VERIFY_ACTIVE ||
 242                                 b == JOB_RELOAD ||
 243                                 b == JOB_RELOAD_OR_START ||
 244                                 b == JOB_TRY_RESTART;
 245
 246                 case JOB_TRY_RESTART:
 247                         return
 248                                 b == JOB_VERIFY_ACTIVE ||
 249                                 b == JOB_RELOAD;
 250                 default:
 251                         return false;
 252
 253         }
 254 }
 255
 256 bool job_type_is_conflicting(JobType a, JobType b) {
 257         assert(a >= 0 && a < _JOB_TYPE_MAX);
 258         assert(b >= 0 && b < _JOB_TYPE_MAX);
 259
 260         return (a == JOB_STOP) != (b == JOB_STOP);
 261 }
 262
 263 bool job_type_is_redundant(JobType a, UnitActiveState b) {
 264         switch (a) {
 265
 266         case JOB_START:
 267                 return
 268                         b == UNIT_ACTIVE ||
 269                         b == UNIT_RELOADING;
 270
 271         case JOB_STOP:
 272                 return
 273                         b == UNIT_INACTIVE ||
 274                         b == UNIT_FAILED;
 275
 276         case JOB_VERIFY_ACTIVE:
 277                 return
 278                         b == UNIT_ACTIVE ||
 279                         b == UNIT_RELOADING;
 280
 281         case JOB_RELOAD:
 282                 return
 283                         b == UNIT_RELOADING;
 284
 285         case JOB_RELOAD_OR_START:
 286                 return
 287                         b == UNIT_ACTIVATING ||
 288                         b == UNIT_RELOADING;
 289
 290         case JOB_RESTART:
 291                 return
 292                         b == UNIT_ACTIVATING;
 293
 294         case JOB_TRY_RESTART:
 295                 return
 296                         b == UNIT_ACTIVATING;
 297
 298         default:
 299                 assert_not_reached("Invalid job type");
 300         }
 301 }
 302
 303 bool job_is_runnable(Job *j) {
 304         Iterator i;
 305         Unit *other;
 306
 307         assert(j);
 308         assert(j->installed);
 309
 310         /* Checks whether there is any job running for the units this
 311          * job needs to be running after (in the case of a 'positive'
 312          * job type) or before (in the case of a 'negative' job
 313          * type. */
 314
 315         /* First check if there is an override */
 316         if (j->ignore_order)
 317                 return true;
 318
 319         if (j->type == JOB_START ||
 320             j->type == JOB_VERIFY_ACTIVE ||
 321             j->type == JOB_RELOAD ||
 322             j->type == JOB_RELOAD_OR_START) {
 323
 324                 /* Immediate result is that the job is or might be
 325                  * started. In this case lets wait for the
 326                  * dependencies, regardless whether they are
 327                  * starting or stopping something. */
 328
 329                 SET_FOREACH(other, j->unit->dependencies[UNIT_AFTER], i)
 330                         if (other->job)
 331                                 return false;
 332         }
 333
 334         /* Also, if something else is being stopped and we should
 335          * change state after it, then lets wait. */
 336
 337         SET_FOREACH(other, j->unit->dependencies[UNIT_BEFORE], i)
 338                 if (other->job &&
 339                     (other->job->type == JOB_STOP ||
 340                      other->job->type == JOB_RESTART ||
 341                      other->job->type == JOB_TRY_RESTART))
 342                         return false;
 343
 344         /* This means that for a service a and a service b where b
 345          * shall be started after a:
 346          *
 347          *  start a + start b → 1st step start a, 2nd step start b
 348          *  start a + stop b  → 1st step stop b,  2nd step start a
 349          *  stop a  + start b → 1st step stop a,  2nd step start b
 350          *  stop a  + stop b  → 1st step stop b,  2nd step stop a
 351          *
 352          *  This has the side effect that restarts are properly
 353          *  synchronized too. */
 354
 355         return true;
 356 }
 357
 358 int job_run_and_invalidate(Job *j) {
 359         int r;
 360         uint32_t id;
 361         Manager *m;
 362
 363         assert(j);
 364         assert(j->installed);
 365
 366         if (j->in_run_queue) {
 367                 LIST_REMOVE(Job, run_queue, j->manager->run_queue, j);
 368                 j->in_run_queue = false;
 369         }
 370
 371         if (j->state != JOB_WAITING)
 372                 return 0;
 373
 374         if (!job_is_runnable(j))
 375                 return -EAGAIN;
 376
 377         j->state = JOB_RUNNING;
 378         job_add_to_dbus_queue(j);
 379
 380         /* While we execute this operation the job might go away (for
 381          * example: because it is replaced by a new, conflicting
 382          * job.) To make sure we don't access a freed job later on we
 383          * store the id here, so that we can verify the job is still
 384          * valid. */
 385         id = j->id;
 386         m = j->manager;
 387
 388         switch (j->type) {
 389
 390                 case JOB_START:
 391                         r = unit_start(j->unit);
 392
 393                         /* If this unit cannot be started, then simply
 394                          * wait */
 395                         if (r == -EBADR)
 396                                 r = 0;
 397
 398                         break;
 399
 400                 case JOB_VERIFY_ACTIVE: {
 401                         UnitActiveState t = unit_active_state(j->unit);
 402                         if (UNIT_IS_ACTIVE_OR_RELOADING(t))
 403                                 r = -EALREADY;
 404                         else if (t == UNIT_ACTIVATING)
 405                                 r = -EAGAIN;
 406                         else
 407                                 r = -ENOEXEC;
 408                         break;
 409                 }
 410
 411                 case JOB_STOP:
 412                         r = unit_stop(j->unit);
 413
 414                         /* If this unit cannot stopped, then simply
 415                          * wait. */
 416                         if (r == -EBADR)
 417                                 r = 0;
 418                         break;
 419
 420                 case JOB_RELOAD:
 421                         r = unit_reload(j->unit);
 422                         break;
 423
 424                 case JOB_RELOAD_OR_START:
 425                         if (unit_active_state(j->unit) == UNIT_ACTIVE) {
 426                                 j->type = JOB_RELOAD;
 427                                 r = unit_reload(j->unit);
 428                         } else {
 429                                 j->type = JOB_START;
 430                                 r = unit_start(j->unit);
 431
 432                                 if (r == -EBADR)
 433                                         r = 0;
 434                         }
 435                         break;
 436
 437                 case JOB_RESTART: {
 438                         UnitActiveState t = unit_active_state(j->unit);
 439                         if (t == UNIT_INACTIVE || t == UNIT_FAILED || t == UNIT_ACTIVATING) {
 440                                 j->type = JOB_START;
 441                                 r = unit_start(j->unit);
 442                         } else
 443                                 r = unit_stop(j->unit);
 444                         break;
 445                 }
 446
 447                 case JOB_TRY_RESTART: {
 448                         UnitActiveState t = unit_active_state(j->unit);
 449                         if (t == UNIT_INACTIVE || t == UNIT_FAILED || t == UNIT_DEACTIVATING)
 450                                 r = -ENOEXEC;
 451                         else if (t == UNIT_ACTIVATING) {
 452                                 j->type = JOB_START;
 453                                 r = unit_start(j->unit);
 454                         } else {
 455                                 j->type = JOB_RESTART;
 456                                 r = unit_stop(j->unit);
 457                         }
 458                         break;
 459                 }
 460
 461                 default:
 462                         assert_not_reached("Unknown job type");
 463         }
 464
 465         if ((j = manager_get_job(m, id))) {
 466                 if (r == -EALREADY)
 467                         r = job_finish_and_invalidate(j, JOB_DONE);
 468                 else if (r == -ENOEXEC)
 469                         r = job_finish_and_invalidate(j, JOB_SKIPPED);
 470                 else if (r == -EAGAIN)
 471                         j->state = JOB_WAITING;
 472                 else if (r < 0)
 473                         r = job_finish_and_invalidate(j, JOB_FAILED);
 474         }
 475
 476         return r;
 477 }
 478
 479 static void job_print_status_message(Unit *u, JobType t, JobResult result) {
 480         assert(u);
 481
 482         if (t == JOB_START) {
 483
 484                 switch (result) {
 485
 486                 case JOB_DONE:
 487                         unit_status_printf(u, ANSI_HIGHLIGHT_GREEN_ON "  OK  " ANSI_HIGHLIGHT_OFF, "Started %s", unit_description(u));
 488                         break;
 489
 490                 case JOB_FAILED:
 491                         unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON "FAILED" ANSI_HIGHLIGHT_OFF, "Failed to start %s", unit_description(u));
 492                         unit_status_printf(u, NULL, "See 'systemctl status %s' for details.", u->id);
 493                         break;
 494
 495                 case JOB_DEPENDENCY:
 496                         unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON " ABORT" ANSI_HIGHLIGHT_OFF, "Dependency failed. Aborted start of %s", unit_description(u));
 497                         break;
 498
 499                 case JOB_TIMEOUT:
 500                         unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON " TIME " ANSI_HIGHLIGHT_OFF, "Timed out starting %s", unit_description(u));
 501                         break;
 502
 503                 default:
 504                         ;
 505                 }
 506
 507         } else if (t == JOB_STOP) {
 508
 509                 switch (result) {
 510
 511                 case JOB_TIMEOUT:
 512                         unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON " TIME " ANSI_HIGHLIGHT_OFF, "Timed out stopping %s", unit_description(u));
 513                         break;
 514
 515                 case JOB_DONE:
 516                 case JOB_FAILED:
 517                         unit_status_printf(u, ANSI_HIGHLIGHT_GREEN_ON "  OK  " ANSI_HIGHLIGHT_OFF, "Stopped %s", unit_description(u));
 518                         break;
 519
 520                 default:
 521                         ;
 522                 }
 523         }
 524 }
 525
 526 int job_finish_and_invalidate(Job *j, JobResult result) {
 527         Unit *u;
 528         Unit *other;
 529         JobType t;
 530         Iterator i;
 531         bool recursed = false;
 532
 533         assert(j);
 534         assert(j->installed);
 535
 536         job_add_to_dbus_queue(j);
 537
 538         /* Patch restart jobs so that they become normal start jobs */
 539         if (result == JOB_DONE && (j->type == JOB_RESTART || j->type == JOB_TRY_RESTART)) {
 540
 541                 log_debug("Converting job %s/%s -> %s/%s",
 542                           j->unit->id, job_type_to_string(j->type),
 543                           j->unit->id, job_type_to_string(JOB_START));
 544
 545                 j->state = JOB_WAITING;
 546                 j->type = JOB_START;
 547
 548                 job_add_to_run_queue(j);
 549
 550                 u = j->unit;
 551                 goto finish;
 552         }
 553
 554         j->result = result;
 555
 556         log_debug("Job %s/%s finished, result=%s", j->unit->id, job_type_to_string(j->type), job_result_to_string(result));
 557
 558         if (result == JOB_FAILED)
 559                 j->manager->n_failed_jobs ++;
 560
 561         u = j->unit;
 562         t = j->type;
 563         job_free(j);
 564
 565         job_print_status_message(u, t, result);
 566
 567         /* Fail depending jobs on failure */
 568         if (result != JOB_DONE) {
 569
 570                 if (t == JOB_START ||
 571                     t == JOB_VERIFY_ACTIVE ||
 572                     t == JOB_RELOAD_OR_START) {
 573
 574                         SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY], i)
 575                                 if (other->job &&
 576                                     (other->job->type == JOB_START ||
 577                                      other->job->type == JOB_VERIFY_ACTIVE ||
 578                                      other->job->type == JOB_RELOAD_OR_START)) {
 579                                         job_finish_and_invalidate(other->job, JOB_DEPENDENCY);
 580                                         recursed = true;
 581                                 }
 582
 583                         SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i)
 584                                 if (other->job &&
 585                                     (other->job->type == JOB_START ||
 586                                      other->job->type == JOB_VERIFY_ACTIVE ||
 587                                      other->job->type == JOB_RELOAD_OR_START)) {
 588                                         job_finish_and_invalidate(other->job, JOB_DEPENDENCY);
 589                                         recursed = true;
 590                                 }
 591
 592                         SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
 593                                 if (other->job &&
 594                                     !other->job->override &&
 595                                     (other->job->type == JOB_START ||
 596                                      other->job->type == JOB_VERIFY_ACTIVE ||
 597                                      other->job->type == JOB_RELOAD_OR_START)) {
 598                                         job_finish_and_invalidate(other->job, JOB_DEPENDENCY);
 599                                         recursed = true;
 600                                 }
 601
 602                 } else if (t == JOB_STOP) {
 603
 604                         SET_FOREACH(other, u->dependencies[UNIT_CONFLICTED_BY], i)
 605                                 if (other->job &&
 606                                     (other->job->type == JOB_START ||
 607                                      other->job->type == JOB_VERIFY_ACTIVE ||
 608                                      other->job->type == JOB_RELOAD_OR_START)) {
 609                                         job_finish_and_invalidate(other->job, JOB_DEPENDENCY);
 610                                         recursed = true;
 611                                 }
 612                 }
 613         }
 614
 615         /* Trigger OnFailure dependencies that are not generated by
 616          * the unit itself. We don't tread JOB_CANCELED as failure in
 617          * this context. And JOB_FAILURE is already handled by the
 618          * unit itself. */
 619         if (result == JOB_TIMEOUT || result == JOB_DEPENDENCY) {
 620                 log_notice("Job %s/%s failed with result '%s'.",
 621                            u->id,
 622                            job_type_to_string(t),
 623                            job_result_to_string(result));
 624
 625                 unit_trigger_on_failure(u);
 626         }
 627
 628 finish:
 629         /* Try to start the next jobs that can be started */
 630         SET_FOREACH(other, u->dependencies[UNIT_AFTER], i)
 631                 if (other->job)
 632                         job_add_to_run_queue(other->job);
 633         SET_FOREACH(other, u->dependencies[UNIT_BEFORE], i)
 634                 if (other->job)
 635                         job_add_to_run_queue(other->job);
 636
 637         manager_check_finished(u->manager);
 638
 639         return recursed;
 640 }
 641
 642 int job_start_timer(Job *j) {
 643         struct itimerspec its;
 644         struct epoll_event ev;
 645         int fd, r;
 646         assert(j);
 647
 648         if (j->unit->job_timeout <= 0 ||
 649             j->timer_watch.type == WATCH_JOB_TIMER)
 650                 return 0;
 651
 652         assert(j->timer_watch.type == WATCH_INVALID);
 653
 654         if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0) {
 655                 r = -errno;
 656                 goto fail;
 657         }
 658
 659         zero(its);
 660         timespec_store(&its.it_value, j->unit->job_timeout);
 661
 662         if (timerfd_settime(fd, 0, &its, NULL) < 0) {
 663                 r = -errno;
 664                 goto fail;
 665         }
 666
 667         zero(ev);
 668         ev.data.ptr = &j->timer_watch;
 669         ev.events = EPOLLIN;
 670
 671         if (epoll_ctl(j->manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
 672                 r = -errno;
 673                 goto fail;
 674         }
 675
 676         j->timer_watch.type = WATCH_JOB_TIMER;
 677         j->timer_watch.fd = fd;
 678         j->timer_watch.data.job = j;
 679
 680         return 0;
 681
 682 fail:
 683         if (fd >= 0)
 684                 close_nointr_nofail(fd);
 685
 686         return r;
 687 }
 688
 689 void job_add_to_run_queue(Job *j) {
 690         assert(j);
 691         assert(j->installed);
 692
 693         if (j->in_run_queue)
 694                 return;
 695
 696         LIST_PREPEND(Job, run_queue, j->manager->run_queue, j);
 697         j->in_run_queue = true;
 698 }
 699
 700 void job_add_to_dbus_queue(Job *j) {
 701         assert(j);
 702         assert(j->installed);
 703
 704         if (j->in_dbus_queue)
 705                 return;
 706
 707         /* We don't check if anybody is subscribed here, since this
 708          * job might just have been created and not yet assigned to a
 709          * connection/client. */
 710
 711         LIST_PREPEND(Job, dbus_queue, j->manager->dbus_job_queue, j);
 712         j->in_dbus_queue = true;
 713 }
 714
 715 char *job_dbus_path(Job *j) {
 716         char *p;
 717
 718         assert(j);
 719
 720         if (asprintf(&p, "/org/freedesktop/systemd1/job/%lu", (unsigned long) j->id) < 0)
 721                 return NULL;
 722
 723         return p;
 724 }
 725
 726 void job_timer_event(Job *j, uint64_t n_elapsed, Watch *w) {
 727         assert(j);
 728         assert(w == &j->timer_watch);
 729
 730         log_warning("Job %s/%s timed out.", j->unit->id, job_type_to_string(j->type));
 731         job_finish_and_invalidate(j, JOB_TIMEOUT);
 732 }
 733
 734 static const char* const job_state_table[_JOB_STATE_MAX] = {
 735         [JOB_WAITING] = "waiting",
 736         [JOB_RUNNING] = "running"
 737 };
 738
 739 DEFINE_STRING_TABLE_LOOKUP(job_state, JobState);
 740
 741 static const char* const job_type_table[_JOB_TYPE_MAX] = {
 742         [JOB_START] = "start",
 743         [JOB_VERIFY_ACTIVE] = "verify-active",
 744         [JOB_STOP] = "stop",
 745         [JOB_RELOAD] = "reload",
 746         [JOB_RELOAD_OR_START] = "reload-or-start",
 747         [JOB_RESTART] = "restart",
 748         [JOB_TRY_RESTART] = "try-restart",
 749 };
 750
 751 DEFINE_STRING_TABLE_LOOKUP(job_type, JobType);
 752
 753 static const char* const job_mode_table[_JOB_MODE_MAX] = {
 754         [JOB_FAIL] = "fail",
 755         [JOB_REPLACE] = "replace",
 756         [JOB_ISOLATE] = "isolate",
 757         [JOB_IGNORE_DEPENDENCIES] = "ignore-dependencies",
 758         [JOB_IGNORE_REQUIREMENTS] = "ignore-requirements"
 759 };
 760
 761 DEFINE_STRING_TABLE_LOOKUP(job_mode, JobMode);
 762
 763 static const char* const job_result_table[_JOB_RESULT_MAX] = {
 764         [JOB_DONE] = "done",
 765         [JOB_CANCELED] = "canceled",
 766         [JOB_TIMEOUT] = "timeout",
 767         [JOB_FAILED] = "failed",
 768         [JOB_DEPENDENCY] = "dependency",
 769         [JOB_SKIPPED] = "skipped"
 770 };
 771
 772 DEFINE_STRING_TABLE_LOOKUP(job_result, JobResult);