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