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                         unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON "FAILED" ANSI_HIGHLIGHT_OFF, format);
 636                         manager_status_printf(u->manager, false, NULL, "See 'systemctl status %s' for details.", u->id);
 637                         break;
 638
 639                 case JOB_DEPENDENCY:
 640                         unit_status_printf(u, ANSI_HIGHLIGHT_YELLOW_ON "DEPEND" ANSI_HIGHLIGHT_OFF, format);
 641                         break;
 642
 643                 case JOB_TIMEOUT:
 644                         unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON " TIME " ANSI_HIGHLIGHT_OFF, format);
 645                         break;
 646
 647                 default:
 648                         ;
 649                 }
 650
 651         } else if (t == JOB_STOP || t == JOB_RESTART) {
 652
 653                 format = job_get_status_message_format(u, t, result);
 654                 if (!format)
 655                         return;
 656
 657                 switch (result) {
 658
 659                 case JOB_TIMEOUT:
 660                         unit_status_printf(u, ANSI_HIGHLIGHT_RED_ON " TIME " ANSI_HIGHLIGHT_OFF, format);
 661                         break;
 662
 663                 case JOB_DONE:
 664                 case JOB_FAILED:
 665                         unit_status_printf(u, ANSI_GREEN_ON "  OK  " ANSI_HIGHLIGHT_OFF, format);
 666                         break;
 667
 668                 default:
 669                         ;
 670                 }
 671
 672         } else if (t == JOB_VERIFY_ACTIVE) {
 673
 674                 /* When verify-active detects the unit is inactive, report it.
 675                  * Most likely a DEPEND warning from a requisiting unit will
 676                  * occur next and it's nice to see what was requisited. */
 677                 if (result == JOB_SKIPPED)
 678                         unit_status_printf(u, ANSI_HIGHLIGHT_ON " INFO " ANSI_HIGHLIGHT_OFF, "%s is not active.");
 679         }
 680 }
 681 #pragma GCC diagnostic pop
 682
 683 #pragma GCC diagnostic push
 684 #pragma GCC diagnostic ignored "-Wformat-nonliteral"
 685 static void job_log_status_message(Unit *u, JobType t, JobResult result) {
 686         const char *format;
 687         char buf[LINE_MAX];
 688
 689         assert(u);
 690         assert(t >= 0);
 691         assert(t < _JOB_TYPE_MAX);
 692
 693         /* Skip this if it goes to the console. since we already print
 694          * to the console anyway... */
 695
 696         if (log_on_console())
 697                 return;
 698
 699         format = job_get_status_message_format_try_harder(u, t, result);
 700         if (!format)
 701                 return;
 702
 703         snprintf(buf, sizeof(buf), format, unit_description(u));
 704         char_array_0(buf);
 705
 706         if (t == JOB_START) {
 707                 sd_id128_t mid;
 708
 709                 mid = result == JOB_DONE ? SD_MESSAGE_UNIT_STARTED : SD_MESSAGE_UNIT_FAILED;
 710                 log_struct_unit(result == JOB_DONE ? LOG_INFO : LOG_ERR,
 711                            u->id,
 712                            MESSAGE_ID(mid),
 713                            "RESULT=%s", job_result_to_string(result),
 714                            "MESSAGE=%s", buf,
 715                            NULL);
 716
 717         } else if (t == JOB_STOP)
 718                 log_struct_unit(result == JOB_DONE ? LOG_INFO : LOG_ERR,
 719                            u->id,
 720                            MESSAGE_ID(SD_MESSAGE_UNIT_STOPPED),
 721                            "RESULT=%s", job_result_to_string(result),
 722                            "MESSAGE=%s", buf,
 723                            NULL);
 724
 725         else if (t == JOB_RELOAD)
 726                 log_struct_unit(result == JOB_DONE ? LOG_INFO : LOG_ERR,
 727                            u->id,
 728                            MESSAGE_ID(SD_MESSAGE_UNIT_RELOADED),
 729                            "RESULT=%s", job_result_to_string(result),
 730                            "MESSAGE=%s", buf,
 731                            NULL);
 732 }
 733 #pragma GCC diagnostic pop
 734
 735 int job_finish_and_invalidate(Job *j, JobResult result, bool recursive) {
 736         Unit *u;
 737         Unit *other;
 738         JobType t;
 739         Iterator i;
 740
 741         assert(j);
 742         assert(j->installed);
 743         assert(j->type < _JOB_TYPE_MAX_IN_TRANSACTION);
 744
 745         u = j->unit;
 746         t = j->type;
 747
 748         j->result = result;
 749
 750         if (j->state == JOB_RUNNING)
 751                 j->manager->n_running_jobs--;
 752
 753         log_debug_unit(u->id, "Job %s/%s finished, result=%s",
 754                        u->id, job_type_to_string(t), job_result_to_string(result));
 755
 756         job_print_status_message(u, t, result);
 757         job_log_status_message(u, t, result);
 758
 759         job_add_to_dbus_queue(j);
 760
 761         /* Patch restart jobs so that they become normal start jobs */
 762         if (result == JOB_DONE && t == JOB_RESTART) {
 763
 764                 job_change_type(j, JOB_START);
 765                 j->state = JOB_WAITING;
 766
 767                 job_add_to_run_queue(j);
 768
 769                 goto finish;
 770         }
 771
 772         if (result == JOB_FAILED || result == JOB_INVALID)
 773                 j->manager->n_failed_jobs ++;
 774
 775         job_uninstall(j);
 776         job_free(j);
 777
 778         /* Fail depending jobs on failure */
 779         if (result != JOB_DONE && recursive) {
 780
 781                 if (t == JOB_START ||
 782                     t == JOB_VERIFY_ACTIVE) {
 783
 784                         SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY], i)
 785                                 if (other->job &&
 786                                     (other->job->type == JOB_START ||
 787                                      other->job->type == JOB_VERIFY_ACTIVE))
 788                                         job_finish_and_invalidate(other->job, JOB_DEPENDENCY, true);
 789
 790                         SET_FOREACH(other, u->dependencies[UNIT_BOUND_BY], i)
 791                                 if (other->job &&
 792                                     (other->job->type == JOB_START ||
 793                                      other->job->type == JOB_VERIFY_ACTIVE))
 794                                         job_finish_and_invalidate(other->job, JOB_DEPENDENCY, true);
 795
 796                         SET_FOREACH(other, u->dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
 797                                 if (other->job &&
 798                                     !other->job->override &&
 799                                     (other->job->type == JOB_START ||
 800                                      other->job->type == JOB_VERIFY_ACTIVE))
 801                                         job_finish_and_invalidate(other->job, JOB_DEPENDENCY, true);
 802
 803                 } else if (t == JOB_STOP) {
 804
 805                         SET_FOREACH(other, u->dependencies[UNIT_CONFLICTED_BY], i)
 806                                 if (other->job &&
 807                                     (other->job->type == JOB_START ||
 808                                      other->job->type == JOB_VERIFY_ACTIVE))
 809                                         job_finish_and_invalidate(other->job, JOB_DEPENDENCY, true);
 810                 }
 811         }
 812
 813         /* Trigger OnFailure dependencies that are not generated by
 814          * the unit itself. We don't treat JOB_CANCELED as failure in
 815          * this context. And JOB_FAILURE is already handled by the
 816          * unit itself. */
 817         if (result == JOB_TIMEOUT || result == JOB_DEPENDENCY) {
 818                 log_struct_unit(LOG_NOTICE,
 819                            u->id,
 820                            "JOB_TYPE=%s", job_type_to_string(t),
 821                            "JOB_RESULT=%s", job_result_to_string(result),
 822                            "Job %s/%s failed with result '%s'.",
 823                            u->id,
 824                            job_type_to_string(t),
 825                            job_result_to_string(result),
 826                            NULL);
 827
 828                 unit_start_on_failure(u);
 829         }
 830
 831         unit_trigger_notify(u);
 832
 833 finish:
 834         /* Try to start the next jobs that can be started */
 835         SET_FOREACH(other, u->dependencies[UNIT_AFTER], i)
 836                 if (other->job)
 837                         job_add_to_run_queue(other->job);
 838         SET_FOREACH(other, u->dependencies[UNIT_BEFORE], i)
 839                 if (other->job)
 840                         job_add_to_run_queue(other->job);
 841
 842         manager_check_finished(u->manager);
 843
 844         return 0;
 845 }
 846
 847 static int job_dispatch_timer(sd_event_source *s, uint64_t monotonic, void *userdata) {
 848         Job *j = userdata;
 849
 850         assert(j);
 851         assert(s == j->timer_event_source);
 852
 853         log_warning_unit(j->unit->id, "Job %s/%s timed out.",
 854                          j->unit->id, job_type_to_string(j->type));
 855
 856         job_finish_and_invalidate(j, JOB_TIMEOUT, true);
 857         return 0;
 858 }
 859
 860 int job_start_timer(Job *j) {
 861         int r;
 862
 863         if (j->unit->job_timeout <= 0 || j->timer_event_source)
 864                 return 0;
 865
 866         j->begin_usec = now(CLOCK_MONOTONIC);
 867
 868         r = sd_event_add_monotonic(j->manager->event, j->begin_usec + j->unit->job_timeout, 0, job_dispatch_timer, j, &j->timer_event_source);
 869         if (r < 0)
 870                 return r;
 871
 872         return 0;
 873 }
 874
 875 void job_add_to_run_queue(Job *j) {
 876         assert(j);
 877         assert(j->installed);
 878
 879         if (j->in_run_queue)
 880                 return;
 881
 882         if (!j->manager->run_queue)
 883                 sd_event_source_set_enabled(j->manager->run_queue_event_source, SD_EVENT_ONESHOT);
 884
 885         LIST_PREPEND(run_queue, j->manager->run_queue, j);
 886         j->in_run_queue = true;
 887 }
 888
 889 void job_add_to_dbus_queue(Job *j) {
 890         assert(j);
 891         assert(j->installed);
 892
 893         if (j->in_dbus_queue)
 894                 return;
 895
 896         /* We don't check if anybody is subscribed here, since this
 897          * job might just have been created and not yet assigned to a
 898          * connection/client. */
 899
 900         LIST_PREPEND(dbus_queue, j->manager->dbus_job_queue, j);
 901         j->in_dbus_queue = true;
 902 }
 903
 904 char *job_dbus_path(Job *j) {
 905         char *p;
 906
 907         assert(j);
 908
 909         if (asprintf(&p, "/org/freedesktop/systemd1/job/%"PRIu32, j->id) < 0)
 910                 return NULL;
 911
 912         return p;
 913 }
 914
 915 int job_serialize(Job *j, FILE *f, FDSet *fds) {
 916         fprintf(f, "job-id=%u\n", j->id);
 917         fprintf(f, "job-type=%s\n", job_type_to_string(j->type));
 918         fprintf(f, "job-state=%s\n", job_state_to_string(j->state));
 919         fprintf(f, "job-override=%s\n", yes_no(j->override));
 920         fprintf(f, "job-irreversible=%s\n", yes_no(j->irreversible));
 921         fprintf(f, "job-sent-dbus-new-signal=%s\n", yes_no(j->sent_dbus_new_signal));
 922         fprintf(f, "job-ignore-order=%s\n", yes_no(j->ignore_order));
 923
 924         if (j->begin_usec > 0)
 925                 fprintf(f, "job-begin="USEC_FMT"\n", j->begin_usec);
 926
 927         bus_client_track_serialize(j->manager, f, j->subscribed);
 928
 929         /* End marker */
 930         fputc('\n', f);
 931         return 0;
 932 }
 933
 934 int job_deserialize(Job *j, FILE *f, FDSet *fds) {
 935         assert(j);
 936
 937         for (;;) {
 938                 char line[LINE_MAX], *l, *v;
 939                 size_t k;
 940
 941                 if (!fgets(line, sizeof(line), f)) {
 942                         if (feof(f))
 943                                 return 0;
 944                         return -errno;
 945                 }
 946
 947                 char_array_0(line);
 948                 l = strstrip(line);
 949
 950                 /* End marker */
 951                 if (l[0] == 0)
 952                         return 0;
 953
 954                 k = strcspn(l, "=");
 955
 956                 if (l[k] == '=') {
 957                         l[k] = 0;
 958                         v = l+k+1;
 959                 } else
 960                         v = l+k;
 961
 962                 if (streq(l, "job-id")) {
 963
 964                         if (safe_atou32(v, &j->id) < 0)
 965                                 log_debug("Failed to parse job id value %s", v);
 966
 967                 } else if (streq(l, "job-type")) {
 968                         JobType t;
 969
 970                         t = job_type_from_string(v);
 971                         if (t < 0)
 972                                 log_debug("Failed to parse job type %s", v);
 973                         else if (t >= _JOB_TYPE_MAX_IN_TRANSACTION)
 974                                 log_debug("Cannot deserialize job of type %s", v);
 975                         else
 976                                 j->type = t;
 977
 978                 } else if (streq(l, "job-state")) {
 979                         JobState s;
 980
 981                         s = job_state_from_string(v);
 982                         if (s < 0)
 983                                 log_debug("Failed to parse job state %s", v);
 984                         else
 985                                 j->state = s;
 986
 987                 } else if (streq(l, "job-override")) {
 988                         int b;
 989
 990                         b = parse_boolean(v);
 991                         if (b < 0)
 992                                 log_debug("Failed to parse job override flag %s", v);
 993                         else
 994                                 j->override = j->override || b;
 995
 996                 } else if (streq(l, "job-irreversible")) {
 997                         int b;
 998
 999                         b = parse_boolean(v);
1000                         if (b < 0)
1001                                 log_debug("Failed to parse job irreversible flag %s", v);
1002                         else
1003                                 j->irreversible = j->irreversible || b;
1004
1005                 } else if (streq(l, "job-sent-dbus-new-signal")) {
1006                         int b;
1007
1008                         b = parse_boolean(v);
1009                         if (b < 0)
1010                                 log_debug("Failed to parse job sent_dbus_new_signal flag %s", v);
1011                         else
1012                                 j->sent_dbus_new_signal = j->sent_dbus_new_signal || b;
1013
1014                 } else if (streq(l, "job-ignore-order")) {
1015                         int b;
1016
1017                         b = parse_boolean(v);
1018                         if (b < 0)
1019                                 log_debug("Failed to parse job ignore_order flag %s", v);
1020                         else
1021                                 j->ignore_order = j->ignore_order || b;
1022
1023                 } else if (streq(l, "job-begin")) {
1024                         unsigned long long ull;
1025
1026                         if (sscanf(v, "%llu", &ull) != 1)
1027                                 log_debug("Failed to parse job-begin value %s", v);
1028                         else
1029                                 j->begin_usec = ull;
1030
1031                 } else {
1032                         char t[strlen(l) + 1 + strlen(v) + 1];
1033
1034                         strcpy(stpcpy(stpcpy(t, l), "="), v);
1035
1036                         if (bus_client_track_deserialize_item(j->manager, &j->subscribed, t) == 0)
1037                                 log_debug("Unknown deserialization key '%s'", l);
1038                 }
1039         }
1040 }
1041
1042 int job_coldplug(Job *j) {
1043         int r;
1044
1045         assert(j);
1046
1047         if (j->begin_usec <= 0)
1048                 return 0;
1049
1050         if (j->timer_event_source)
1051                 j->timer_event_source = sd_event_source_unref(j->timer_event_source);
1052
1053         r = sd_event_add_monotonic(j->manager->event, j->begin_usec + j->unit->job_timeout, 0, job_dispatch_timer, j, &j->timer_event_source);
1054         if (r < 0)
1055                 log_debug("Failed to restart timeout for job: %s", strerror(-r));
1056
1057         return r;
1058 }
1059
1060 void job_shutdown_magic(Job *j) {
1061         assert(j);
1062
1063         /* The shutdown target gets some special treatment here: we
1064          * tell the kernel to begin with flushing its disk caches, to
1065          * optimize shutdown time a bit. Ideally we wouldn't hardcode
1066          * this magic into PID 1. However all other processes aren't
1067          * options either since they'd exit much sooner than PID 1 and
1068          * asynchronous sync() would cause their exit to be
1069          * delayed. */
1070
1071         if (j->type != JOB_START)
1072                 return;
1073
1074         if (j->unit->manager->running_as != SYSTEMD_SYSTEM)
1075                 return;
1076
1077         if (!unit_has_name(j->unit, SPECIAL_SHUTDOWN_TARGET))
1078                 return;
1079
1080         /* In case messages on console has been disabled on boot */
1081         j->unit->manager->no_console_output = false;
1082
1083         if (detect_container(NULL) > 0)
1084                 return;
1085
1086         asynchronous_sync();
1087 }
1088
1089 int job_get_timeout(Job *j, uint64_t *timeout) {
1090         Unit *u = j->unit;
1091         uint64_t x = -1, y = -1;
1092         int r = 0, q = 0;
1093
1094         assert(u);
1095
1096         if (j->timer_event_source) {
1097                 r = sd_event_source_get_time(j->timer_event_source, &x);
1098                 if (r < 0)
1099                         return r;
1100                 r = 1;
1101         }
1102
1103         if (UNIT_VTABLE(u)->get_timeout) {
1104                 q = UNIT_VTABLE(u)->get_timeout(u, &y);
1105                 if (q < 0)
1106                         return q;
1107         }
1108
1109         if (r == 0 && q == 0)
1110                 return 0;
1111
1112         *timeout = MIN(x, y);
1113
1114         log_info("job_get_timeout %s %d/%"PRIu64" %d/%"PRIu64" -> 1/%"PRIu64,
1115                  j->unit->id, r, x, q, y, *timeout);
1116
1117         return 1;
1118 }
1119
1120 static const char* const job_state_table[_JOB_STATE_MAX] = {
1121         [JOB_WAITING] = "waiting",
1122         [JOB_RUNNING] = "running"
1123 };
1124
1125 DEFINE_STRING_TABLE_LOOKUP(job_state, JobState);
1126
1127 static const char* const job_type_table[_JOB_TYPE_MAX] = {
1128         [JOB_START] = "start",
1129         [JOB_VERIFY_ACTIVE] = "verify-active",
1130         [JOB_STOP] = "stop",
1131         [JOB_RELOAD] = "reload",
1132         [JOB_RELOAD_OR_START] = "reload-or-start",
1133         [JOB_RESTART] = "restart",
1134         [JOB_TRY_RESTART] = "try-restart",
1135         [JOB_NOP] = "nop",
1136 };
1137
1138 DEFINE_STRING_TABLE_LOOKUP(job_type, JobType);
1139
1140 static const char* const job_mode_table[_JOB_MODE_MAX] = {
1141         [JOB_FAIL] = "fail",
1142         [JOB_REPLACE] = "replace",
1143         [JOB_REPLACE_IRREVERSIBLY] = "replace-irreversibly",
1144         [JOB_ISOLATE] = "isolate",
1145         [JOB_IGNORE_DEPENDENCIES] = "ignore-dependencies",
1146         [JOB_IGNORE_REQUIREMENTS] = "ignore-requirements",
1147         [JOB_FLUSH] = "flush",
1148 };
1149
1150 DEFINE_STRING_TABLE_LOOKUP(job_mode, JobMode);
1151
1152 static const char* const job_result_table[_JOB_RESULT_MAX] = {
1153         [JOB_DONE] = "done",
1154         [JOB_CANCELED] = "canceled",
1155         [JOB_TIMEOUT] = "timeout",
1156         [JOB_FAILED] = "failed",
1157         [JOB_DEPENDENCY] = "dependency",
1158         [JOB_SKIPPED] = "skipped",
1159         [JOB_INVALID] = "invalid",
1160 };
1161
1162 DEFINE_STRING_TABLE_LOOKUP(job_result, JobResult);