src/core/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 Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <assert.h>
  23 #include <errno.h>
  24 #include <sys/timerfd.h>
  25 #include <sys/epoll.h>
  26
  27 #include "sd-id128.h"
  28 #include "sd-messages.h"
  29 #include "set.h"
  30 #include "unit.h"
  31 #include "macro.h"
  32 #include "strv.h"
  33 #include "load-fragment.h"
  34 #include "load-dropin.h"
  35 #include "log.h"
  36 #include "dbus-job.h"
  37 #include "special.h"
  38 #include "async.h"
  39 #include "virt.h"
  40 #include "dbus.h"
  41
  42 Job* job_new_raw(Unit *unit) {
  43         Job *j;
  44
  45         /* used for deserialization */
  46
  47         assert(unit);
  48
  49         j = new0(Job, 1);
  50         if (!j)
  51                 return NULL;
  52
  53         j->manager = unit->manager;
  54         j->unit = unit;
  55         j->type = _JOB_TYPE_INVALID;
  56
  57         return j;
  58 }
  59
  60 Job* job_new(Unit *unit, JobType type) {
  61         Job *j;
  62
  63         assert(type < _JOB_TYPE_MAX);
  64
  65         j = job_new_raw(unit);
  66         if (!j)
  67                 return NULL;
  68
  69         j->id = j->manager->current_job_id++;
  70         j->type = type;
  71
  72         /* We don't link it here, that's what job_dependency() is for */
  73
  74         return j;
  75 }
  76
  77 void job_free(Job *j) {
  78         assert(j);
  79         assert(!j->installed);
  80         assert(!j->transaction_prev);
  81         assert(!j->transaction_next);
  82         assert(!j->subject_list);
  83         assert(!j->object_list);
  84
  85         if (j->in_run_queue)
  86                 LIST_REMOVE(run_queue, j->manager->run_queue, j);
  87
  88         if (j->in_dbus_queue)
  89                 LIST_REMOVE(dbus_queue, j->manager->dbus_job_queue, j);
  90
  91         sd_event_source_unref(j->timer_event_source);
  92
  93         sd_bus_track_unref(j->subscribed);
  94         strv_free(j->deserialized_subscribed);
  95
  96         free(j);
  97 }
  98
  99 void job_uninstall(Job *j) {
 100         Job **pj;
 101
 102         assert(j->installed);
 103
 104         pj = (j->type == JOB_NOP) ? &j->unit->nop_job : &j->unit->job;
 105         assert(*pj == j);
 106
 107         /* Detach from next 'bigger' objects */
 108
 109         /* daemon-reload should be transparent to job observers */
 110         if (j->manager->n_reloading <= 0)
 111                 bus_job_send_removed_signal(j);
 112
 113         *pj = NULL;
 114
 115         unit_add_to_gc_queue(j->unit);
 116
 117         hashmap_remove(j->manager->jobs, UINT32_TO_PTR(j->id));
 118         j->installed = false;
 119 }
 120
 121 static bool job_type_allows_late_merge(JobType t) {
 122         /* Tells whether it is OK to merge a job of type 't' with an already
 123          * running job.
 124          * Reloads cannot be merged this way. Think of the sequence:
 125          * 1. Reload of a daemon is in progress; the daemon has already loaded
 126          *    its config file, but hasn't completed the reload operation yet.
 127          * 2. Edit foo's config file.
 128          * 3. Trigger another reload to have the daemon use the new config.
 129          * Should the second reload job be merged into the first one, the daemon
 130          * would not know about the new config.
 131          * JOB_RESTART jobs on the other hand can be merged, because they get
 132          * patched into JOB_START after stopping the unit. So if we see a
 133          * JOB_RESTART running, it means the unit hasn't stopped yet and at
 134          * this time the merge is still allowed. */
 135         return t != JOB_RELOAD;
 136 }
 137
 138 static void job_merge_into_installed(Job *j, Job *other) {
 139         assert(j->installed);
 140         assert(j->unit == other->unit);
 141
 142         if (j->type != JOB_NOP)
 143                 job_type_merge_and_collapse(&j->type, other->type, j->unit);
 144         else
 145                 assert(other->type == JOB_NOP);
 146
 147         j->override = j->override || other->override;
 148         j->irreversible = j->irreversible || other->irreversible;
 149         j->ignore_order = j->ignore_order || other->ignore_order;
 150 }
 151
 152 Job* job_install(Job *j) {
 153         Job **pj;
 154         Job *uj;
 155
 156         assert(!j->installed);
 157         assert(j->type < _JOB_TYPE_MAX_IN_TRANSACTION);
 158
 159         pj = (j->type == JOB_NOP) ? &j->unit->nop_job : &j->unit->job;
 160         uj = *pj;
 161
 162         if (uj) {
 163                 if (j->type != JOB_NOP && job_type_is_conflicting(uj->type, j->type))
 164                         job_finish_and_invalidate(uj, JOB_CANCELED, false);
 165                 else {
 166                         /* not conflicting, i.e. mergeable */
 167
 168                         if (j->type == JOB_NOP || uj->state == JOB_WAITING ||
 169                             (job_type_allows_late_merge(j->type) && job_type_is_superset(uj->type, j->type))) {
 170                                 job_merge_into_installed(uj, j);
 171                                 log_debug_unit(uj->unit->id,
 172                                                "Merged into installed job %s/%s as %u",
 173                                                uj->unit->id, job_type_to_string(uj->type), (unsigned) uj->id);
 174                                 return uj;
 175                         } else {
 176                                 /* already running and not safe to merge into */
 177                                 /* Patch uj to become a merged job and re-run it. */
 178                                 /* XXX It should be safer to queue j to run after uj finishes, but it is
 179                                  * not currently possible to have more than one installed job per unit. */
 180                                 job_merge_into_installed(uj, j);
 181                                 log_debug_unit(uj->unit->id,
 182                                                "Merged into running job, re-running: %s/%s as %u",
 183                                                uj->unit->id, job_type_to_string(uj->type), (unsigned) uj->id);
 184                                 uj->state = JOB_WAITING;
 185                                 uj->manager->n_running_jobs--;
 186                                 return uj;
 187                         }
 188                 }
 189         }
 190
 191         /* Install the job */
 192         *pj = j;
 193         j->installed = true;
 194         j->manager->n_installed_jobs ++;
 195         log_debug_unit(j->unit->id,
 196                        "Installed new job %s/%s as %u",
 197                        j->unit->id, job_type_to_string(j->type), (unsigned) j->id);
 198         return j;
 199 }
 200
 201 int job_install_deserialized(Job *j) {
 202         Job **pj;
 203
 204         assert(!j->installed);
 205
 206         if (j->type < 0 || j->type >= _JOB_TYPE_MAX_IN_TRANSACTION) {
 207                 log_debug("Invalid job type %s in deserialization.", strna(job_type_to_string(j->type)));
 208                 return -EINVAL;
 209         }
 210
 211         pj = (j->type == JOB_NOP) ? &j->unit->nop_job : &j->unit->job;
 212
 213         if (*pj) {
 214                 log_debug_unit(j->unit->id,
 215                                "Unit %s already has a job installed. Not installing deserialized job.",
 216                                j->unit->id);
 217                 return -EEXIST;
 218         }
 219         *pj = j;
 220         j->installed = true;
 221         log_debug_unit(j->unit->id,
 222                        "Reinstalled deserialized job %s/%s as %u",
 223                        j->unit->id, job_type_to_string(j->type), (unsigned) j->id);
 224         return 0;
 225 }
 226
 227 JobDependency* job_dependency_new(Job *subject, Job *object, bool matters, bool conflicts) {
 228         JobDependency *l;
 229
 230         assert(object);
 231
 232         /* Adds a new job link, which encodes that the 'subject' job
 233          * needs the 'object' job in some way. If 'subject' is NULL
 234          * this means the 'anchor' job (i.e. the one the user
 235          * explicitly asked for) is the requester. */
 236
 237         if (!(l = new0(JobDependency, 1)))
 238                 return NULL;
 239
 240         l->subject = subject;
 241         l->object = object;
 242         l->matters = matters;
 243         l->conflicts = conflicts;
 244
 245         if (subject)
 246                 LIST_PREPEND(subject, subject->subject_list, l);
 247
 248         LIST_PREPEND(object, object->object_list, l);
 249
 250         return l;
 251 }
 252
 253 void job_dependency_free(JobDependency *l) {
 254         assert(l);
 255
 256         if (l->subject)
 257                 LIST_REMOVE(subject, l->subject->subject_list, l);
 258
 259         LIST_REMOVE(object, l->object->object_list, l);
 260
 261         free(l);
 262 }
 263
 264 void job_dump(Job *j, FILE*f, const char *prefix) {
 265         assert(j);
 266         assert(f);
 267
 268         if (!prefix)
 269                 prefix = "";
 270
 271         fprintf(f,
 272                 "%s-> Job %u:\n"
 273                 "%s\tAction: %s -> %s\n"
 274                 "%s\tState: %s\n"
 275                 "%s\tForced: %s\n"
 276                 "%s\tIrreversible: %s\n",
 277                 prefix, j->id,
 278                 prefix, j->unit->id, job_type_to_string(j->type),
 279                 prefix, job_state_to_string(j->state),
 280                 prefix, yes_no(j->override),
 281                 prefix, yes_no(j->irreversible));
 282 }
 283
 284 /*
 285  * Merging is commutative, so imagine the matrix as symmetric. We store only
 286  * its lower triangle to avoid duplication. We don't store the main diagonal,
 287  * because A merged with A is simply A.
 288  *
 289  * If the resulting type is collapsed immediately afterwards (to get rid of
 290  * the JOB_RELOAD_OR_START, which lies outside the lookup function's domain),
 291  * the following properties hold:
 292  *
 293  * Merging is associative! A merged with B merged with C is the same as
 294  * A merged with C merged with B.
 295  *
 296  * Mergeability is transitive! If A can be merged with B and B with C then
 297  * A also with C.
 298  *
 299  * Also, if A merged with B cannot be merged with C, then either A or B cannot
 300  * be merged with C either.
 301  */
 302 static const JobType job_merging_table[] = {
 303 /* What \ With       *  JOB_START         JOB_VERIFY_ACTIVE  JOB_STOP JOB_RELOAD */
 304 /*********************************************************************************/
 305 /*JOB_START          */
 306 /*JOB_VERIFY_ACTIVE  */ JOB_START,
 307 /*JOB_STOP           */ -1,                  -1,
 308 /*JOB_RELOAD         */ JOB_RELOAD_OR_START, JOB_RELOAD,          -1,
 309 /*JOB_RESTART        */ JOB_RESTART,         JOB_RESTART,         -1, JOB_RESTART,
 310 };
 311
 312 JobType job_type_lookup_merge(JobType a, JobType b) {
 313         assert_cc(ELEMENTSOF(job_merging_table) == _JOB_TYPE_MAX_MERGING * (_JOB_TYPE_MAX_MERGING - 1) / 2);
 314         assert(a >= 0 && a < _JOB_TYPE_MAX_MERGING);
 315         assert(b >= 0 && b < _JOB_TYPE_MAX_MERGING);
 316
 317         if (a == b)
 318                 return a;
 319
 320         if (a < b) {
 321                 JobType tmp = a;
 322                 a = b;
 323                 b = tmp;
 324         }
 325
 326         return job_merging_table[(a - 1) * a / 2 + b];
 327 }
 328
 329 bool job_type_is_redundant(JobType a, UnitActiveState b) {
 330         switch (a) {
 331
 332         case JOB_START:
 333                 return
 334                         b == UNIT_ACTIVE ||
 335                         b == UNIT_RELOADING;
 336
 337         case JOB_STOP:
 338                 return
 339                         b == UNIT_INACTIVE ||
 340                         b == UNIT_FAILED;
 341
 342         case JOB_VERIFY_ACTIVE:
 343                 return
 344                         b == UNIT_ACTIVE ||
 345                         b == UNIT_RELOADING;
 346
 347         case JOB_RELOAD:
 348                 return
 349                         b == UNIT_RELOADING;
 350
 351         case JOB_RESTART:
 352                 return
 353                         b == UNIT_ACTIVATING;
 354
 355         default:
 356                 assert_not_reached("Invalid job type");
 357         }
 358 }
 359
 360 void job_type_collapse(JobType *t, Unit *u) {
 361         UnitActiveState s;
 362
 363         switch (*t) {
 364
 365         case JOB_TRY_RESTART:
 366                 s = unit_active_state(u);
 367                 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(s))
 368                         *t = JOB_NOP;
 369                 else
 370                         *t = JOB_RESTART;
 371                 break;
 372
 373         case JOB_RELOAD_OR_START:
 374                 s = unit_active_state(u);
 375                 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(s))
 376                         *t = JOB_START;
 377                 else
 378                         *t = JOB_RELOAD;
 379                 break;
 380
 381         default:
 382                 ;
 383         }
 384 }
 385
 386 int job_type_merge_and_collapse(JobType *a, JobType b, Unit *u) {
 387         JobType t = job_type_lookup_merge(*a, b);
 388         if (t < 0)
 389                 return -EEXIST;
 390         *a = t;
 391         job_type_collapse(a, u);
 392         return 0;
 393 }
 394
 395 static bool job_is_runnable(Job *j) {
 396         Iterator i;
 397         Unit *other;
 398
 399         assert(j);
 400         assert(j->installed);
 401
 402         /* Checks whether there is any job running for the units this
 403          * job needs to be running after (in the case of a 'positive'
 404          * job type) or before (in the case of a 'negative' job
 405          * type. */
 406
 407         /* Note that unit types have a say in what is runnable,
 408          * too. For example, if they return -EAGAIN from
 409          * unit_start() they can indicate they are not
 410          * runnable yet. */
 411
 412         /* First check if there is an override */
 413         if (j->ignore_order)
 414                 return true;
 415
 416         if (j->type == JOB_NOP)
 417                 return true;
 418
 419         if (j->type == JOB_START ||
 420             j->type == JOB_VERIFY_ACTIVE ||
 421             j->type == JOB_RELOAD) {
 422
 423                 /* Immediate result is that the job is or might be
 424                  * started. In this case lets wait for the
 425                  * dependencies, regardless whether they are
 426                  * starting or stopping something. */
 427
 428                 SET_FOREACH(other, j->unit->dependencies[UNIT_AFTER], i)
 429                         if (other->job)
 430                                 return false;
 431         }
 432
 433         /* Also, if something else is being stopped and we should
 434          * change state after it, then lets wait. */
 435
 436         SET_FOREACH(other, j->unit->dependencies[UNIT_BEFORE], i)
 437                 if (other->job &&
 438                     (other->job->type == JOB_STOP ||
 439                      other->job->type == JOB_RESTART))
 440                         return false;
 441
 442         /* This means that for a service a and a service b where b
 443          * shall be started after a:
 444          *
 445          *  start a + start b → 1st step start a, 2nd step start b
 446          *  start a + stop b  → 1st step stop b,  2nd step start a
 447          *  stop a  + start b → 1st step stop a,  2nd step start b
 448          *  stop a  + stop b  → 1st step stop b,  2nd step stop a
 449          *
 450          *  This has the side effect that restarts are properly
 451          *  synchronized too. */
 452
 453         return true;
 454 }
 455
 456 static void job_change_type(Job *j, JobType newtype) {
 457         log_debug_unit(j->unit->id,
 458                        "Converting job %s/%s -> %s/%s",
 459                        j->unit->id, job_type_to_string(j->type),
 460                        j->unit->id, job_type_to_string(newtype));
 461
 462         j->type = newtype;
 463 }
 464
 465 int job_run_and_invalidate(Job *j) {
 466         int r;
 467         uint32_t id;
 468         Manager *m = j->manager;
 469
 470         assert(j);
 471         assert(j->installed);
 472         assert(j->type < _JOB_TYPE_MAX_IN_TRANSACTION);
 473         assert(j->in_run_queue);
 474
 475         LIST_REMOVE(run_queue, j->manager->run_queue, j);
 476         j->in_run_queue = false;
 477
 478         if (j->state != JOB_WAITING)
 479                 return 0;
 480
 481         if (!job_is_runnable(j))
 482                 return -EAGAIN;
 483
 484         j->state = JOB_RUNNING;
 485         m->n_running_jobs++;
 486         job_add_to_dbus_queue(j);
 487
 488         /* While we execute this operation the job might go away (for
 489          * example: because it is replaced by a new, conflicting
 490          * job.) To make sure we don't access a freed job later on we
 491          * store the id here, so that we can verify the job is still
 492          * valid. */
 493         id = j->id;
 494
 495         switch (j->type) {
 496
 497                 case JOB_START:
 498                         r = unit_start(j->unit);
 499
 500                         /* If this unit cannot be started, then simply wait */
 501                         if (r == -EBADR)
 502                                 r = 0;
 503                         break;
 504
 505                 case JOB_VERIFY_ACTIVE: {
 506                         UnitActiveState t = unit_active_state(j->unit);
 507                         if (UNIT_IS_ACTIVE_OR_RELOADING(t))
 508                                 r = -EALREADY;
 509                         else if (t == UNIT_ACTIVATING)
 510                                 r = -EAGAIN;
 511                         else
 512                                 r = -EBADR;
 513                         break;
 514                 }
 515
 516                 case JOB_STOP:
 517                 case JOB_RESTART:
 518                         r = unit_stop(j->unit);
 519
 520                         /* If this unit cannot stopped, then simply wait. */
 521                         if (r == -EBADR)
 522                                 r = 0;
 523                         break;
 524
 525                 case JOB_RELOAD:
 526                         r = unit_reload(j->unit);
 527                         break;
 528
 529                 case JOB_NOP:
 530                         r = -EALREADY;
 531                         break;
 532
 533                 default:
 534                         assert_not_reached("Unknown job type");
 535         }
 536
 537         j = manager_get_job(m, id);
 538         if (j) {
 539                 if (r == -EALREADY)
 540                         r = job_finish_and_invalidate(j, JOB_DONE, true);
 541                 else if (r == -EBADR)
 542                         r = job_finish_and_invalidate(j, JOB_SKIPPED, true);
 543                 else if (r == -ENOEXEC)
 544                         r = job_finish_and_invalidate(j, JOB_INVALID, true);
 545                 else if (r == -EAGAIN) {
 546                         j->state = JOB_WAITING;
 547                         m->n_running_jobs--;
 548                 } else if (r < 0)
 549                         r = job_finish_and_invalidate(j, JOB_FAILED, true);
 550         }
 551
 552         return r;
 553 }
 554
 555 _pure_ static const char *job_get_status_message_format(Unit *u, JobType t, JobResult result) {
 556         const UnitStatusMessageFormats *format_table;
 557
 558         assert(u);
 559         assert(t >= 0);
 560         assert(t < _JOB_TYPE_MAX);
 561
 562         format_table = &UNIT_VTABLE(u)->status_message_formats;
 563         if (!format_table)
 564                 return NULL;
 565
 566         if (t == JOB_START)
 567                 return format_table->finished_start_job[result];
 568         else if (t == JOB_STOP || t == JOB_RESTART)
 569                 return format_table->finished_stop_job[result];
 570
 571         return NULL;
 572 }
 573
 574 _pure_ static const char *job_get_status_message_format_try_harder(Unit *u, JobType t, JobResult result) {
 575         const char *format;
 576
 577         assert(u);
 578         assert(t >= 0);
 579         assert(t < _JOB_TYPE_MAX);
 580
 581         format = job_get_status_message_format(u, t, result);
 582         if (format)
 583                 return format;
 584
 585         /* Return generic strings */
 586         if (t == JOB_START) {
 587                 if (result == JOB_DONE)
 588                         return "Started %s.";
 589                 else if (result == JOB_FAILED)
 590                         return "Failed to start %s.";
 591                 else if (result == JOB_DEPENDENCY)
 592                         return "Dependency failed for %s.";
 593                 else if (result == JOB_TIMEOUT)
 594                         return "Timed out starting %s.";
 595         } else if (t == JOB_STOP || t == JOB_RESTART) {
 596                 if (result == JOB_DONE)
 597                         return "Stopped %s.";
 598                 else if (result == JOB_FAILED)
 599                         return "Stopped (with error) %s.";
 600                 else if (result == JOB_TIMEOUT)
 601                         return "Timed out stoppping %s.";
 602         } else if (t == JOB_RELOAD) {
 603                 if (result == JOB_DONE)
 604                         return "Reloaded %s.";
 605                 else if (result == JOB_FAILED)
 606                         return "Reload failed for %s.";
 607                 else if (result == JOB_TIMEOUT)
 608                         return "Timed out reloading %s.";
 609         }
 610
 611         return NULL;
 612 }
 613
 614 static void job_print_status_message(Unit *u, JobType t, JobResult result) {
 615         const char *format;
 616
 617         assert(u);
 618         assert(t >= 0);
 619         assert(t < _JOB_TYPE_MAX);
 620
 621         DISABLE_WARNING_FORMAT_NONLITERAL;
 622
 623         if (t == JOB_START) {
 624                 format = job_get_status_message_format(u, t, result);
 625                 if (!format)
 626                         return;
 627
 628                 switch (result) {
 629
 630                 case JOB_DONE:
 631                         if (u->condition_result)
 632                                 unit_status_printf(u, ANSI_GREEN_ON "  OK  " ANSI_HIGHLIGHT_OFF, format);
 633                         break;
 634
 635                 case JOB_FAILED:
 636                         manager_flip_auto_status(u->manager, true);
 637                         unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON "FAILED" ANSI_HIGHLIGHT_OFF, format);
 638                         manager_status_printf(u->manager, false, NULL, "See 'systemctl status %s' for details.", u->id);
 639                         break;
 640
 641                 case JOB_DEPENDENCY:
 642                         manager_flip_auto_status(u->manager, true);
 643                         unit_status_printf(u, ANSI_HIGHLIGHT_YELLOW_ON "DEPEND" ANSI_HIGHLIGHT_OFF, format);
 644                         break;
 645
 646                 case JOB_TIMEOUT:
 647                         manager_flip_auto_status(u->manager, true);
 648                         unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON " TIME " ANSI_HIGHLIGHT_OFF, format);
 649                         break;
 650
 651                 default:
 652                         ;
 653                 }
 654
 655         } else if (t == JOB_STOP || t == JOB_RESTART) {
 656
 657                 format = job_get_status_message_format(u, t, result);
 658                 if (!format)
 659                         return;
 660
 661                 switch (result) {
 662
 663                 case JOB_TIMEOUT:
 664                         manager_flip_auto_status(u->manager, true);
 665                         unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON " TIME " ANSI_HIGHLIGHT_OFF, format);
 666                         break;
 667
 668                 case JOB_DONE:
 669                 case JOB_FAILED:
 670                         unit_status_printf(u, ANSI_GREEN_ON "  OK  " ANSI_HIGHLIGHT_OFF, format);
 671                         break;
 672
 673                 default:
 674                         ;
 675                 }
 676
 677         } else if (t == JOB_VERIFY_ACTIVE) {
 678
 679                 /* When verify-active detects the unit is inactive, report it.
 680                  * Most likely a DEPEND warning from a requisiting unit will
 681                  * occur next and it's nice to see what was requisited. */
 682                 if (result == JOB_SKIPPED)
 683                         unit_status_printf(u, ANSI_HIGHLIGHT_ON " INFO " ANSI_HIGHLIGHT_OFF, "%s is not active.");
 684         }
 685
 686         REENABLE_WARNING;
 687 }
 688
 689 static void job_log_status_message(Unit *u, JobType t, JobResult result) {
 690         const char *format;
 691         char buf[LINE_MAX];
 692
 693         assert(u);
 694         assert(t >= 0);
 695         assert(t < _JOB_TYPE_MAX);
 696
 697         /* Skip this if it goes to the console. since we already print
 698          * to the console anyway... */
 699
 700         if (log_on_console())
 701                 return;
 702
 703         format = job_get_status_message_format_try_harder(u, t, result);
 704         if (!format)
 705                 return;
 706
 707         DISABLE_WARNING_FORMAT_NONLITERAL;
 708         snprintf(buf, sizeof(buf), format, unit_description(u));
 709         char_array_0(buf);
 710         REENABLE_WARNING;
 711
 712         if (t == JOB_START) {
 713                 sd_id128_t mid;
 714
 715                 mid = result == JOB_DONE ? SD_MESSAGE_UNIT_STARTED : SD_MESSAGE_UNIT_FAILED;
 716                 log_struct_unit(result == JOB_DONE ? LOG_INFO : LOG_ERR,
 717                            u->id,
 718                            MESSAGE_ID(mid),
 719                            "RESULT=%s", job_result_to_string(result),
 720                            "MESSAGE=%s", buf,
 721                            NULL);
 722
 723         } else if (t == JOB_STOP)
 724                 log_struct_unit(result == JOB_DONE ? LOG_INFO : LOG_ERR,
 725                            u->id,
 726                            MESSAGE_ID(SD_MESSAGE_UNIT_STOPPED),
 727                            "RESULT=%s", job_result_to_string(result),
 728                            "MESSAGE=%s", buf,
 729                            NULL);
 730
 731         else if (t == JOB_RELOAD)
 732                 log_struct_unit(result == JOB_DONE ? LOG_INFO : LOG_ERR,
 733                            u->id,
 734                            MESSAGE_ID(SD_MESSAGE_UNIT_RELOADED),
 735                            "RESULT=%s", job_result_to_string(result),
 736                            "MESSAGE=%s", buf,
 737                            NULL);
 738 }
 739
 740 int job_finish_and_invalidate(Job *j, JobResult result, bool recursive) {
 741         Unit *u;
 742         Unit *other;
 743         JobType t;
 744         Iterator i;
 745
 746         assert(j);
 747         assert(j->installed);
 748         assert(j->type < _JOB_TYPE_MAX_IN_TRANSACTION);
 749
 750         u = j->unit;
 751         t = j->type;
 752
 753         j->result = result;
 754
 755         if (j->state == JOB_RUNNING)
 756                 j->manager->n_running_jobs--;
 757
 758         log_debug_unit(u->id, "Job %s/%s finished, result=%s",
 759                        u->id, job_type_to_string(t), job_result_to_string(result));
 760
 761         job_print_status_message(u, t, result);
 762         job_log_status_message(u, t, result);
 763
 764         job_add_to_dbus_queue(j);
 765
 766         /* Patch restart jobs so that they become normal start jobs */
 767         if (result == JOB_DONE && t == JOB_RESTART) {
 768
 769                 job_change_type(j, JOB_START);
 770                 j->state = JOB_WAITING;
 771
 772                 job_add_to_run_queue(j);
 773
 774                 goto finish;
 775         }
 776
 777         if (result == JOB_FAILED || result == JOB_INVALID)
 778                 j->manager->n_failed_jobs ++;
 779
 780         job_uninstall(j);
 781         job_free(j);
 782
 783         /* Fail depending jobs on failure */
 784         if (result != JOB_DONE && recursive) {
 785
 786                 if (t == JOB_START ||
 787                     t == JOB_VERIFY_ACTIVE) {
 788
 789                         SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY], i)
 790                                 if (other->job &&
 791                                     (other->job->type == JOB_START ||
 792                                      other->job->type == JOB_VERIFY_ACTIVE))
 793                                         job_finish_and_invalidate(other->job, JOB_DEPENDENCY, true);
 794
 795                         SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i)
 796                                 if (other->job &&
 797                                     (other->job->type == JOB_START ||
 798                                      other->job->type == JOB_VERIFY_ACTIVE))
 799                                         job_finish_and_invalidate(other->job, JOB_DEPENDENCY, true);
 800
 801                         SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
 802                                 if (other->job &&
 803                                     !other->job->override &&
 804                                     (other->job->type == JOB_START ||
 805                                      other->job->type == JOB_VERIFY_ACTIVE))
 806                                         job_finish_and_invalidate(other->job, JOB_DEPENDENCY, true);
 807
 808                 } else if (t == JOB_STOP) {
 809
 810                         SET_FOREACH(other, u->dependencies[UNIT_CONFLICTED_BY], i)
 811                                 if (other->job &&
 812                                     (other->job->type == JOB_START ||
 813                                      other->job->type == JOB_VERIFY_ACTIVE))
 814                                         job_finish_and_invalidate(other->job, JOB_DEPENDENCY, true);
 815                 }
 816         }
 817
 818         /* Trigger OnFailure dependencies that are not generated by
 819          * the unit itself. We don't treat JOB_CANCELED as failure in
 820          * this context. And JOB_FAILURE is already handled by the
 821          * unit itself. */
 822         if (result == JOB_TIMEOUT || result == JOB_DEPENDENCY) {
 823                 log_struct_unit(LOG_NOTICE,
 824                            u->id,
 825                            "JOB_TYPE=%s", job_type_to_string(t),
 826                            "JOB_RESULT=%s", job_result_to_string(result),
 827                            "Job %s/%s failed with result '%s'.",
 828                            u->id,
 829                            job_type_to_string(t),
 830                            job_result_to_string(result),
 831                            NULL);
 832
 833                 unit_start_on_failure(u);
 834         }
 835
 836         unit_trigger_notify(u);
 837
 838 finish:
 839         /* Try to start the next jobs that can be started */
 840         SET_FOREACH(other, u->dependencies[UNIT_AFTER], i)
 841                 if (other->job)
 842                         job_add_to_run_queue(other->job);
 843         SET_FOREACH(other, u->dependencies[UNIT_BEFORE], i)
 844                 if (other->job)
 845                         job_add_to_run_queue(other->job);
 846
 847         manager_check_finished(u->manager);
 848
 849         return 0;
 850 }
 851
 852 static int job_dispatch_timer(sd_event_source *s, uint64_t monotonic, void *userdata) {
 853         Job *j = userdata;
 854
 855         assert(j);
 856         assert(s == j->timer_event_source);
 857
 858         log_warning_unit(j->unit->id, "Job %s/%s timed out.",
 859                          j->unit->id, job_type_to_string(j->type));
 860
 861         job_finish_and_invalidate(j, JOB_TIMEOUT, true);
 862         return 0;
 863 }
 864
 865 int job_start_timer(Job *j) {
 866         int r;
 867
 868         if (j->timer_event_source)
 869                 return 0;
 870
 871         j->begin_usec = now(CLOCK_MONOTONIC);
 872
 873         if (j->unit->job_timeout <= 0)
 874                 return 0;
 875
 876         r = sd_event_add_time(
 877                         j->manager->event,
 878                         &j->timer_event_source,
 879                         CLOCK_MONOTONIC,
 880                         j->begin_usec + j->unit->job_timeout, 0,
 881                         job_dispatch_timer, j);
 882         if (r < 0)
 883                 return r;
 884
 885         return 0;
 886 }
 887
 888 void job_add_to_run_queue(Job *j) {
 889         assert(j);
 890         assert(j->installed);
 891
 892         if (j->in_run_queue)
 893                 return;
 894
 895         if (!j->manager->run_queue)
 896                 sd_event_source_set_enabled(j->manager->run_queue_event_source, SD_EVENT_ONESHOT);
 897
 898         LIST_PREPEND(run_queue, j->manager->run_queue, j);
 899         j->in_run_queue = true;
 900 }
 901
 902 void job_add_to_dbus_queue(Job *j) {
 903         assert(j);
 904         assert(j->installed);
 905
 906         if (j->in_dbus_queue)
 907                 return;
 908
 909         /* We don't check if anybody is subscribed here, since this
 910          * job might just have been created and not yet assigned to a
 911          * connection/client. */
 912
 913         LIST_PREPEND(dbus_queue, j->manager->dbus_job_queue, j);
 914         j->in_dbus_queue = true;
 915 }
 916
 917 char *job_dbus_path(Job *j) {
 918         char *p;
 919
 920         assert(j);
 921
 922         if (asprintf(&p, "/org/freedesktop/systemd1/job/%"PRIu32, j->id) < 0)
 923                 return NULL;
 924
 925         return p;
 926 }
 927
 928 int job_serialize(Job *j, FILE *f, FDSet *fds) {
 929         fprintf(f, "job-id=%u\n", j->id);
 930         fprintf(f, "job-type=%s\n", job_type_to_string(j->type));
 931         fprintf(f, "job-state=%s\n", job_state_to_string(j->state));
 932         fprintf(f, "job-override=%s\n", yes_no(j->override));
 933         fprintf(f, "job-irreversible=%s\n", yes_no(j->irreversible));
 934         fprintf(f, "job-sent-dbus-new-signal=%s\n", yes_no(j->sent_dbus_new_signal));
 935         fprintf(f, "job-ignore-order=%s\n", yes_no(j->ignore_order));
 936
 937         if (j->begin_usec > 0)
 938                 fprintf(f, "job-begin="USEC_FMT"\n", j->begin_usec);
 939
 940         bus_track_serialize(j->subscribed, f);
 941
 942         /* End marker */
 943         fputc('\n', f);
 944         return 0;
 945 }
 946
 947 int job_deserialize(Job *j, FILE *f, FDSet *fds) {
 948         assert(j);
 949
 950         for (;;) {
 951                 char line[LINE_MAX], *l, *v;
 952                 size_t k;
 953
 954                 if (!fgets(line, sizeof(line), f)) {
 955                         if (feof(f))
 956                                 return 0;
 957                         return -errno;
 958                 }
 959
 960                 char_array_0(line);
 961                 l = strstrip(line);
 962
 963                 /* End marker */
 964                 if (l[0] == 0)
 965                         return 0;
 966
 967                 k = strcspn(l, "=");
 968
 969                 if (l[k] == '=') {
 970                         l[k] = 0;
 971                         v = l+k+1;
 972                 } else
 973                         v = l+k;
 974
 975                 if (streq(l, "job-id")) {
 976
 977                         if (safe_atou32(v, &j->id) < 0)
 978                                 log_debug("Failed to parse job id value %s", v);
 979
 980                 } else if (streq(l, "job-type")) {
 981                         JobType t;
 982
 983                         t = job_type_from_string(v);
 984                         if (t < 0)
 985                                 log_debug("Failed to parse job type %s", v);
 986                         else if (t >= _JOB_TYPE_MAX_IN_TRANSACTION)
 987                                 log_debug("Cannot deserialize job of type %s", v);
 988                         else
 989                                 j->type = t;
 990
 991                 } else if (streq(l, "job-state")) {
 992                         JobState s;
 993
 994                         s = job_state_from_string(v);
 995                         if (s < 0)
 996                                 log_debug("Failed to parse job state %s", v);
 997                         else
 998                                 j->state = s;
 999
1000                 } else if (streq(l, "job-override")) {
1001                         int b;
1002
1003                         b = parse_boolean(v);
1004                         if (b < 0)
1005                                 log_debug("Failed to parse job override flag %s", v);
1006                         else
1007                                 j->override = j->override || b;
1008
1009                 } else if (streq(l, "job-irreversible")) {
1010                         int b;
1011
1012                         b = parse_boolean(v);
1013                         if (b < 0)
1014                                 log_debug("Failed to parse job irreversible flag %s", v);
1015                         else
1016                                 j->irreversible = j->irreversible || b;
1017
1018                 } else if (streq(l, "job-sent-dbus-new-signal")) {
1019                         int b;
1020
1021                         b = parse_boolean(v);
1022                         if (b < 0)
1023                                 log_debug("Failed to parse job sent_dbus_new_signal flag %s", v);
1024                         else
1025                                 j->sent_dbus_new_signal = j->sent_dbus_new_signal || b;
1026
1027                 } else if (streq(l, "job-ignore-order")) {
1028                         int b;
1029
1030                         b = parse_boolean(v);
1031                         if (b < 0)
1032                                 log_debug("Failed to parse job ignore_order flag %s", v);
1033                         else
1034                                 j->ignore_order = j->ignore_order || b;
1035
1036                 } else if (streq(l, "job-begin")) {
1037                         unsigned long long ull;
1038
1039                         if (sscanf(v, "%llu", &ull) != 1)
1040                                 log_debug("Failed to parse job-begin value %s", v);
1041                         else
1042                                 j->begin_usec = ull;
1043
1044                 } else if (streq(l, "subscribed")) {
1045
1046                         if (strv_extend(&j->deserialized_subscribed, v) < 0)
1047                                 return log_oom();
1048                 }
1049         }
1050 }
1051
1052 int job_coldplug(Job *j) {
1053         int r;
1054
1055         assert(j);
1056
1057         /* After deserialization is complete and the bus connection
1058          * set up again, let's start watching our subscribers again */
1059         r = bus_track_coldplug(j->manager, &j->subscribed, &j->deserialized_subscribed);
1060         if (r < 0)
1061                 return r;
1062
1063         if (j->state == JOB_WAITING)
1064                 job_add_to_run_queue(j);
1065
1066         if (j->begin_usec == 0 || j->unit->job_timeout == 0)
1067                 return 0;
1068
1069         if (j->timer_event_source)
1070                 j->timer_event_source = sd_event_source_unref(j->timer_event_source);
1071
1072         r = sd_event_add_time(
1073                         j->manager->event,
1074                         &j->timer_event_source,
1075                         CLOCK_MONOTONIC,
1076                         j->begin_usec + j->unit->job_timeout, 0,
1077                         job_dispatch_timer, j);
1078         if (r < 0)
1079                 log_debug("Failed to restart timeout for job: %s", strerror(-r));
1080
1081         return r;
1082 }
1083
1084 void job_shutdown_magic(Job *j) {
1085         assert(j);
1086
1087         /* The shutdown target gets some special treatment here: we
1088          * tell the kernel to begin with flushing its disk caches, to
1089          * optimize shutdown time a bit. Ideally we wouldn't hardcode
1090          * this magic into PID 1. However all other processes aren't
1091          * options either since they'd exit much sooner than PID 1 and
1092          * asynchronous sync() would cause their exit to be
1093          * delayed. */
1094
1095         if (j->type != JOB_START)
1096                 return;
1097
1098         if (j->unit->manager->running_as != SYSTEMD_SYSTEM)
1099                 return;
1100
1101         if (!unit_has_name(j->unit, SPECIAL_SHUTDOWN_TARGET))
1102                 return;
1103
1104         /* In case messages on console has been disabled on boot */
1105         j->unit->manager->no_console_output = false;
1106
1107         if (detect_container(NULL) > 0)
1108                 return;
1109
1110         asynchronous_sync();
1111 }
1112
1113 int job_get_timeout(Job *j, uint64_t *timeout) {
1114         Unit *u = j->unit;
1115         uint64_t x = -1, y = -1;
1116         int r = 0, q = 0;
1117
1118         assert(u);
1119
1120         if (j->timer_event_source) {
1121                 r = sd_event_source_get_time(j->timer_event_source, &x);
1122                 if (r < 0)
1123                         return r;
1124                 r = 1;
1125         }
1126
1127         if (UNIT_VTABLE(u)->get_timeout) {
1128                 q = UNIT_VTABLE(u)->get_timeout(u, &y);
1129                 if (q < 0)
1130                         return q;
1131         }
1132
1133         if (r == 0 && q == 0)
1134                 return 0;
1135
1136         *timeout = MIN(x, y);
1137
1138         return 1;
1139 }
1140
1141 static const char* const job_state_table[_JOB_STATE_MAX] = {
1142         [JOB_WAITING] = "waiting",
1143         [JOB_RUNNING] = "running"
1144 };
1145
1146 DEFINE_STRING_TABLE_LOOKUP(job_state, JobState);
1147
1148 static const char* const job_type_table[_JOB_TYPE_MAX] = {
1149         [JOB_START] = "start",
1150         [JOB_VERIFY_ACTIVE] = "verify-active",
1151         [JOB_STOP] = "stop",
1152         [JOB_RELOAD] = "reload",
1153         [JOB_RELOAD_OR_START] = "reload-or-start",
1154         [JOB_RESTART] = "restart",
1155         [JOB_TRY_RESTART] = "try-restart",
1156         [JOB_NOP] = "nop",
1157 };
1158
1159 DEFINE_STRING_TABLE_LOOKUP(job_type, JobType);
1160
1161 static const char* const job_mode_table[_JOB_MODE_MAX] = {
1162         [JOB_FAIL] = "fail",
1163         [JOB_REPLACE] = "replace",
1164         [JOB_REPLACE_IRREVERSIBLY] = "replace-irreversibly",
1165         [JOB_ISOLATE] = "isolate",
1166         [JOB_FLUSH] = "flush",
1167         [JOB_IGNORE_DEPENDENCIES] = "ignore-dependencies",
1168         [JOB_IGNORE_REQUIREMENTS] = "ignore-requirements",
1169 };
1170
1171 DEFINE_STRING_TABLE_LOOKUP(job_mode, JobMode);
1172
1173 static const char* const job_result_table[_JOB_RESULT_MAX] = {
1174         [JOB_DONE] = "done",
1175         [JOB_CANCELED] = "canceled",
1176         [JOB_TIMEOUT] = "timeout",
1177         [JOB_FAILED] = "failed",
1178         [JOB_DEPENDENCY] = "dependency",
1179         [JOB_SKIPPED] = "skipped",
1180         [JOB_INVALID] = "invalid",
1181 };
1182
1183 DEFINE_STRING_TABLE_LOOKUP(job_result, JobResult);