src/core/dbus-unit.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include "sd-bus.h"
  21
  22 #include "alloc-util.h"
  23 #include "bus-common-errors.h"
  24 #include "cgroup-util.h"
  25 #include "dbus-unit.h"
  26 #include "dbus.h"
  27 #include "fd-util.h"
  28 #include "locale-util.h"
  29 #include "log.h"
  30 #include "process-util.h"
  31 #include "selinux-access.h"
  32 #include "signal-util.h"
  33 #include "special.h"
  34 #include "string-util.h"
  35 #include "strv.h"
  36 #include "user-util.h"
  37
  38 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_load_state, unit_load_state, UnitLoadState);
  39 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_job_mode, job_mode, JobMode);
  40 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_failure_action, failure_action, FailureAction);
  41
  42 static int property_get_names(
  43                 sd_bus *bus,
  44                 const char *path,
  45                 const char *interface,
  46                 const char *property,
  47                 sd_bus_message *reply,
  48                 void *userdata,
  49                 sd_bus_error *error) {
  50
  51         Unit *u = userdata;
  52         Iterator i;
  53         const char *t;
  54         int r;
  55
  56         assert(bus);
  57         assert(reply);
  58         assert(u);
  59
  60         r = sd_bus_message_open_container(reply, 'a', "s");
  61         if (r < 0)
  62                 return r;
  63
  64         SET_FOREACH(t, u->names, i) {
  65                 r = sd_bus_message_append(reply, "s", t);
  66                 if (r < 0)
  67                         return r;
  68         }
  69
  70         return sd_bus_message_close_container(reply);
  71 }
  72
  73 static int property_get_following(
  74                 sd_bus *bus,
  75                 const char *path,
  76                 const char *interface,
  77                 const char *property,
  78                 sd_bus_message *reply,
  79                 void *userdata,
  80                 sd_bus_error *error) {
  81
  82         Unit *u = userdata, *f;
  83
  84         assert(bus);
  85         assert(reply);
  86         assert(u);
  87
  88         f = unit_following(u);
  89         return sd_bus_message_append(reply, "s", f ? f->id : "");
  90 }
  91
  92 static int property_get_dependencies(
  93                 sd_bus *bus,
  94                 const char *path,
  95                 const char *interface,
  96                 const char *property,
  97                 sd_bus_message *reply,
  98                 void *userdata,
  99                 sd_bus_error *error) {
 100
 101         Set *s = *(Set**) userdata;
 102         Iterator j;
 103         Unit *u;
 104         int r;
 105
 106         assert(bus);
 107         assert(reply);
 108
 109         r = sd_bus_message_open_container(reply, 'a', "s");
 110         if (r < 0)
 111                 return r;
 112
 113         SET_FOREACH(u, s, j) {
 114                 r = sd_bus_message_append(reply, "s", u->id);
 115                 if (r < 0)
 116                         return r;
 117         }
 118
 119         return sd_bus_message_close_container(reply);
 120 }
 121
 122 static int property_get_obsolete_dependencies(
 123                 sd_bus *bus,
 124                 const char *path,
 125                 const char *interface,
 126                 const char *property,
 127                 sd_bus_message *reply,
 128                 void *userdata,
 129                 sd_bus_error *error) {
 130
 131         assert(bus);
 132         assert(reply);
 133
 134         /* For dependency types we don't support anymore always return an empty array */
 135         return sd_bus_message_append(reply, "as", 0);
 136 }
 137
 138 static int property_get_description(
 139                 sd_bus *bus,
 140                 const char *path,
 141                 const char *interface,
 142                 const char *property,
 143                 sd_bus_message *reply,
 144                 void *userdata,
 145                 sd_bus_error *error) {
 146
 147         Unit *u = userdata;
 148
 149         assert(bus);
 150         assert(reply);
 151         assert(u);
 152
 153         return sd_bus_message_append(reply, "s", unit_description(u));
 154 }
 155
 156 static int property_get_active_state(
 157                 sd_bus *bus,
 158                 const char *path,
 159                 const char *interface,
 160                 const char *property,
 161                 sd_bus_message *reply,
 162                 void *userdata,
 163                 sd_bus_error *error) {
 164
 165         Unit *u = userdata;
 166
 167         assert(bus);
 168         assert(reply);
 169         assert(u);
 170
 171         return sd_bus_message_append(reply, "s", unit_active_state_to_string(unit_active_state(u)));
 172 }
 173
 174 static int property_get_sub_state(
 175                 sd_bus *bus,
 176                 const char *path,
 177                 const char *interface,
 178                 const char *property,
 179                 sd_bus_message *reply,
 180                 void *userdata,
 181                 sd_bus_error *error) {
 182
 183         Unit *u = userdata;
 184
 185         assert(bus);
 186         assert(reply);
 187         assert(u);
 188
 189         return sd_bus_message_append(reply, "s", unit_sub_state_to_string(u));
 190 }
 191
 192 static int property_get_unit_file_preset(
 193                 sd_bus *bus,
 194                 const char *path,
 195                 const char *interface,
 196                 const char *property,
 197                 sd_bus_message *reply,
 198                 void *userdata,
 199                 sd_bus_error *error) {
 200
 201         Unit *u = userdata;
 202         int r;
 203
 204         assert(bus);
 205         assert(reply);
 206         assert(u);
 207
 208         r = unit_get_unit_file_preset(u);
 209
 210         return sd_bus_message_append(reply, "s",
 211                                      r < 0 ? "":
 212                                      r > 0 ? "enabled" : "disabled");
 213 }
 214
 215 static int property_get_unit_file_state(
 216                 sd_bus *bus,
 217                 const char *path,
 218                 const char *interface,
 219                 const char *property,
 220                 sd_bus_message *reply,
 221                 void *userdata,
 222                 sd_bus_error *error) {
 223
 224         Unit *u = userdata;
 225
 226         assert(bus);
 227         assert(reply);
 228         assert(u);
 229
 230         return sd_bus_message_append(reply, "s", unit_file_state_to_string(unit_get_unit_file_state(u)));
 231 }
 232
 233 static int property_get_can_start(
 234                 sd_bus *bus,
 235                 const char *path,
 236                 const char *interface,
 237                 const char *property,
 238                 sd_bus_message *reply,
 239                 void *userdata,
 240                 sd_bus_error *error) {
 241
 242         Unit *u = userdata;
 243
 244         assert(bus);
 245         assert(reply);
 246         assert(u);
 247
 248         return sd_bus_message_append(reply, "b", unit_can_start(u) && !u->refuse_manual_start);
 249 }
 250
 251 static int property_get_can_stop(
 252                 sd_bus *bus,
 253                 const char *path,
 254                 const char *interface,
 255                 const char *property,
 256                 sd_bus_message *reply,
 257                 void *userdata,
 258                 sd_bus_error *error) {
 259
 260         Unit *u = userdata;
 261
 262         assert(bus);
 263         assert(reply);
 264         assert(u);
 265
 266         /* On the lower levels we assume that every unit we can start
 267          * we can also stop */
 268
 269         return sd_bus_message_append(reply, "b", unit_can_start(u) && !u->refuse_manual_stop);
 270 }
 271
 272 static int property_get_can_reload(
 273                 sd_bus *bus,
 274                 const char *path,
 275                 const char *interface,
 276                 const char *property,
 277                 sd_bus_message *reply,
 278                 void *userdata,
 279                 sd_bus_error *error) {
 280
 281         Unit *u = userdata;
 282
 283         assert(bus);
 284         assert(reply);
 285         assert(u);
 286
 287         return sd_bus_message_append(reply, "b", unit_can_reload(u));
 288 }
 289
 290 static int property_get_can_isolate(
 291                 sd_bus *bus,
 292                 const char *path,
 293                 const char *interface,
 294                 const char *property,
 295                 sd_bus_message *reply,
 296                 void *userdata,
 297                 sd_bus_error *error) {
 298
 299         Unit *u = userdata;
 300
 301         assert(bus);
 302         assert(reply);
 303         assert(u);
 304
 305         return sd_bus_message_append(reply, "b", unit_can_isolate(u) && !u->refuse_manual_start);
 306 }
 307
 308 static int property_get_job(
 309                 sd_bus *bus,
 310                 const char *path,
 311                 const char *interface,
 312                 const char *property,
 313                 sd_bus_message *reply,
 314                 void *userdata,
 315                 sd_bus_error *error) {
 316
 317         _cleanup_free_ char *p = NULL;
 318         Unit *u = userdata;
 319
 320         assert(bus);
 321         assert(reply);
 322         assert(u);
 323
 324         if (!u->job)
 325                 return sd_bus_message_append(reply, "(uo)", 0, "/");
 326
 327         p = job_dbus_path(u->job);
 328         if (!p)
 329                 return -ENOMEM;
 330
 331         return sd_bus_message_append(reply, "(uo)", u->job->id, p);
 332 }
 333
 334 static int property_get_need_daemon_reload(
 335                 sd_bus *bus,
 336                 const char *path,
 337                 const char *interface,
 338                 const char *property,
 339                 sd_bus_message *reply,
 340                 void *userdata,
 341                 sd_bus_error *error) {
 342
 343         Unit *u = userdata;
 344
 345         assert(bus);
 346         assert(reply);
 347         assert(u);
 348
 349         return sd_bus_message_append(reply, "b", unit_need_daemon_reload(u));
 350 }
 351
 352 static int property_get_conditions(
 353                 sd_bus *bus,
 354                 const char *path,
 355                 const char *interface,
 356                 const char *property,
 357                 sd_bus_message *reply,
 358                 void *userdata,
 359                 sd_bus_error *error) {
 360
 361         const char *(*to_string)(ConditionType type) = NULL;
 362         Condition **list = userdata, *c;
 363         int r;
 364
 365         assert(bus);
 366         assert(reply);
 367         assert(list);
 368
 369         to_string = streq(property, "Asserts") ? assert_type_to_string : condition_type_to_string;
 370
 371         r = sd_bus_message_open_container(reply, 'a', "(sbbsi)");
 372         if (r < 0)
 373                 return r;
 374
 375         LIST_FOREACH(conditions, c, *list) {
 376                 int tristate;
 377
 378                 tristate =
 379                         c->result == CONDITION_UNTESTED ? 0 :
 380                         c->result == CONDITION_SUCCEEDED ? 1 : -1;
 381
 382                 r = sd_bus_message_append(reply, "(sbbsi)",
 383                                           to_string(c->type),
 384                                           c->trigger, c->negate,
 385                                           c->parameter, tristate);
 386                 if (r < 0)
 387                         return r;
 388
 389         }
 390
 391         return sd_bus_message_close_container(reply);
 392 }
 393
 394 static int property_get_load_error(
 395                 sd_bus *bus,
 396                 const char *path,
 397                 const char *interface,
 398                 const char *property,
 399                 sd_bus_message *reply,
 400                 void *userdata,
 401                 sd_bus_error *error) {
 402
 403         _cleanup_(sd_bus_error_free) sd_bus_error e = SD_BUS_ERROR_NULL;
 404         Unit *u = userdata;
 405
 406         assert(bus);
 407         assert(reply);
 408         assert(u);
 409
 410         if (u->load_error != 0)
 411                 sd_bus_error_set_errno(&e, u->load_error);
 412
 413         return sd_bus_message_append(reply, "(ss)", e.name, e.message);
 414 }
 415
 416 static int bus_verify_manage_units_async_full(
 417                 Unit *u,
 418                 const char *verb,
 419                 int capability,
 420                 const char *polkit_message,
 421                 sd_bus_message *call,
 422                 sd_bus_error *error) {
 423
 424         const char *details[9] = {
 425                 "unit", u->id,
 426                 "verb", verb,
 427         };
 428
 429         if (polkit_message) {
 430                 details[4] = "polkit.message";
 431                 details[5] = polkit_message;
 432                 details[6] = "polkit.gettext_domain";
 433                 details[7] = GETTEXT_PACKAGE;
 434         }
 435
 436         return bus_verify_polkit_async(call, capability, "org.freedesktop.systemd1.manage-units", details, false, UID_INVALID, &u->manager->polkit_registry, error);
 437 }
 438
 439 int bus_unit_method_start_generic(
 440                 sd_bus_message *message,
 441                 Unit *u,
 442                 JobType job_type,
 443                 bool reload_if_possible,
 444                 sd_bus_error *error) {
 445
 446         const char *smode;
 447         JobMode mode;
 448         _cleanup_free_ char *verb = NULL;
 449         static const char *const polkit_message_for_job[_JOB_TYPE_MAX] = {
 450                 [JOB_START]       = N_("Authentication is required to start '$(unit)'."),
 451                 [JOB_STOP]        = N_("Authentication is required to stop '$(unit)'."),
 452                 [JOB_RELOAD]      = N_("Authentication is required to reload '$(unit)'."),
 453                 [JOB_RESTART]     = N_("Authentication is required to restart '$(unit)'."),
 454                 [JOB_TRY_RESTART] = N_("Authentication is required to restart '$(unit)'."),
 455         };
 456         int r;
 457
 458         assert(message);
 459         assert(u);
 460         assert(job_type >= 0 && job_type < _JOB_TYPE_MAX);
 461
 462         r = mac_selinux_unit_access_check(
 463                         u, message,
 464                         job_type_to_access_method(job_type),
 465                         error);
 466         if (r < 0)
 467                 return r;
 468
 469         r = sd_bus_message_read(message, "s", &smode);
 470         if (r < 0)
 471                 return r;
 472
 473         mode = job_mode_from_string(smode);
 474         if (mode < 0)
 475                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Job mode %s invalid", smode);
 476
 477         if (reload_if_possible)
 478                 verb = strjoin("reload-or-", job_type_to_string(job_type), NULL);
 479         else
 480                 verb = strdup(job_type_to_string(job_type));
 481         if (!verb)
 482                 return -ENOMEM;
 483
 484         r = bus_verify_manage_units_async_full(
 485                         u,
 486                         verb,
 487                         CAP_SYS_ADMIN,
 488                         job_type < _JOB_TYPE_MAX ? polkit_message_for_job[job_type] : NULL,
 489                         message,
 490                         error);
 491         if (r < 0)
 492                 return r;
 493         if (r == 0)
 494                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 495
 496         return bus_unit_queue_job(message, u, job_type, mode, reload_if_possible, error);
 497 }
 498
 499 static int method_start(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 500         return bus_unit_method_start_generic(message, userdata, JOB_START, false, error);
 501 }
 502
 503 static int method_stop(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 504         return bus_unit_method_start_generic(message, userdata, JOB_STOP, false, error);
 505 }
 506
 507 static int method_reload(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 508         return bus_unit_method_start_generic(message, userdata, JOB_RELOAD, false, error);
 509 }
 510
 511 static int method_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 512         return bus_unit_method_start_generic(message, userdata, JOB_RESTART, false, error);
 513 }
 514
 515 static int method_try_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 516         return bus_unit_method_start_generic(message, userdata, JOB_TRY_RESTART, false, error);
 517 }
 518
 519 static int method_reload_or_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 520         return bus_unit_method_start_generic(message, userdata, JOB_RESTART, true, error);
 521 }
 522
 523 static int method_reload_or_try_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 524         return bus_unit_method_start_generic(message, userdata, JOB_TRY_RESTART, true, error);
 525 }
 526
 527 int bus_unit_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 528         Unit *u = userdata;
 529         const char *swho;
 530         int32_t signo;
 531         KillWho who;
 532         int r;
 533
 534         assert(message);
 535         assert(u);
 536
 537         r = mac_selinux_unit_access_check(u, message, "stop", error);
 538         if (r < 0)
 539                 return r;
 540
 541         r = sd_bus_message_read(message, "si", &swho, &signo);
 542         if (r < 0)
 543                 return r;
 544
 545         if (isempty(swho))
 546                 who = KILL_ALL;
 547         else {
 548                 who = kill_who_from_string(swho);
 549                 if (who < 0)
 550                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid who argument %s", swho);
 551         }
 552
 553         if (!SIGNAL_VALID(signo))
 554                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Signal number out of range.");
 555
 556         r = bus_verify_manage_units_async_full(
 557                         u,
 558                         "kill",
 559                         CAP_KILL,
 560                         N_("Authentication is required to kill '$(unit)'."),
 561                         message,
 562                         error);
 563         if (r < 0)
 564                 return r;
 565         if (r == 0)
 566                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 567
 568         r = unit_kill(u, who, signo, error);
 569         if (r < 0)
 570                 return r;
 571
 572         return sd_bus_reply_method_return(message, NULL);
 573 }
 574
 575 int bus_unit_method_reset_failed(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 576         Unit *u = userdata;
 577         int r;
 578
 579         assert(message);
 580         assert(u);
 581
 582         r = mac_selinux_unit_access_check(u, message, "reload", error);
 583         if (r < 0)
 584                 return r;
 585
 586         r = bus_verify_manage_units_async_full(
 587                         u,
 588                         "reset-failed",
 589                         CAP_SYS_ADMIN,
 590                         N_("Authentication is required to reset the \"failed\" state of '$(unit)'."),
 591                         message,
 592                         error);
 593         if (r < 0)
 594                 return r;
 595         if (r == 0)
 596                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 597
 598         unit_reset_failed(u);
 599
 600         return sd_bus_reply_method_return(message, NULL);
 601 }
 602
 603 int bus_unit_method_set_properties(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 604         Unit *u = userdata;
 605         int runtime, r;
 606
 607         assert(message);
 608         assert(u);
 609
 610         r = mac_selinux_unit_access_check(u, message, "start", error);
 611         if (r < 0)
 612                 return r;
 613
 614         r = sd_bus_message_read(message, "b", &runtime);
 615         if (r < 0)
 616                 return r;
 617
 618         r = bus_verify_manage_units_async_full(
 619                         u,
 620                         "set-property",
 621                         CAP_SYS_ADMIN,
 622                         N_("Authentication is required to set properties on '$(unit)'."),
 623                         message,
 624                         error);
 625         if (r < 0)
 626                 return r;
 627         if (r == 0)
 628                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 629
 630         r = bus_unit_set_properties(u, message, runtime ? UNIT_RUNTIME : UNIT_PERSISTENT, true, error);
 631         if (r < 0)
 632                 return r;
 633
 634         return sd_bus_reply_method_return(message, NULL);
 635 }
 636
 637 const sd_bus_vtable bus_unit_vtable[] = {
 638         SD_BUS_VTABLE_START(0),
 639
 640         SD_BUS_PROPERTY("Id", "s", NULL, offsetof(Unit, id), SD_BUS_VTABLE_PROPERTY_CONST),
 641         SD_BUS_PROPERTY("Names", "as", property_get_names, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 642         SD_BUS_PROPERTY("Following", "s", property_get_following, 0, 0),
 643         SD_BUS_PROPERTY("Requires", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRES]), SD_BUS_VTABLE_PROPERTY_CONST),
 644         SD_BUS_PROPERTY("Requisite", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE]), SD_BUS_VTABLE_PROPERTY_CONST),
 645         SD_BUS_PROPERTY("Wants", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTS]), SD_BUS_VTABLE_PROPERTY_CONST),
 646         SD_BUS_PROPERTY("BindsTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BINDS_TO]), SD_BUS_VTABLE_PROPERTY_CONST),
 647         SD_BUS_PROPERTY("PartOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PART_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 648         SD_BUS_PROPERTY("RequiredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 649         SD_BUS_PROPERTY("RequisiteOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 650         SD_BUS_PROPERTY("WantedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 651         SD_BUS_PROPERTY("BoundBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BOUND_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 652         SD_BUS_PROPERTY("ConsistsOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONSISTS_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 653         SD_BUS_PROPERTY("Conflicts", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTS]), SD_BUS_VTABLE_PROPERTY_CONST),
 654         SD_BUS_PROPERTY("ConflictedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 655         SD_BUS_PROPERTY("Before", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BEFORE]), SD_BUS_VTABLE_PROPERTY_CONST),
 656         SD_BUS_PROPERTY("After", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_AFTER]), SD_BUS_VTABLE_PROPERTY_CONST),
 657         SD_BUS_PROPERTY("OnFailure", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_ON_FAILURE]), SD_BUS_VTABLE_PROPERTY_CONST),
 658         SD_BUS_PROPERTY("Triggers", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERS]), SD_BUS_VTABLE_PROPERTY_CONST),
 659         SD_BUS_PROPERTY("TriggeredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 660         SD_BUS_PROPERTY("PropagatesReloadTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PROPAGATES_RELOAD_TO]), SD_BUS_VTABLE_PROPERTY_CONST),
 661         SD_BUS_PROPERTY("ReloadPropagatedFrom", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_RELOAD_PROPAGATED_FROM]), SD_BUS_VTABLE_PROPERTY_CONST),
 662         SD_BUS_PROPERTY("JoinsNamespaceOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_JOINS_NAMESPACE_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 663         SD_BUS_PROPERTY("RequiresMountsFor", "as", NULL, offsetof(Unit, requires_mounts_for), SD_BUS_VTABLE_PROPERTY_CONST),
 664         SD_BUS_PROPERTY("Documentation", "as", NULL, offsetof(Unit, documentation), SD_BUS_VTABLE_PROPERTY_CONST),
 665         SD_BUS_PROPERTY("Description", "s", property_get_description, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 666         SD_BUS_PROPERTY("LoadState", "s", property_get_load_state, offsetof(Unit, load_state), SD_BUS_VTABLE_PROPERTY_CONST),
 667         SD_BUS_PROPERTY("ActiveState", "s", property_get_active_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 668         SD_BUS_PROPERTY("SubState", "s", property_get_sub_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 669         SD_BUS_PROPERTY("FragmentPath", "s", NULL, offsetof(Unit, fragment_path), SD_BUS_VTABLE_PROPERTY_CONST),
 670         SD_BUS_PROPERTY("SourcePath", "s", NULL, offsetof(Unit, source_path), SD_BUS_VTABLE_PROPERTY_CONST),
 671         SD_BUS_PROPERTY("DropInPaths", "as", NULL, offsetof(Unit, dropin_paths), SD_BUS_VTABLE_PROPERTY_CONST),
 672         SD_BUS_PROPERTY("UnitFileState", "s", property_get_unit_file_state, 0, 0),
 673         SD_BUS_PROPERTY("UnitFilePreset", "s", property_get_unit_file_preset, 0, 0),
 674         BUS_PROPERTY_DUAL_TIMESTAMP("StateChangeTimestamp", offsetof(Unit, state_change_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 675         BUS_PROPERTY_DUAL_TIMESTAMP("InactiveExitTimestamp", offsetof(Unit, inactive_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 676         BUS_PROPERTY_DUAL_TIMESTAMP("ActiveEnterTimestamp", offsetof(Unit, active_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 677         BUS_PROPERTY_DUAL_TIMESTAMP("ActiveExitTimestamp", offsetof(Unit, active_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 678         BUS_PROPERTY_DUAL_TIMESTAMP("InactiveEnterTimestamp", offsetof(Unit, inactive_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 679         SD_BUS_PROPERTY("CanStart", "b", property_get_can_start, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 680         SD_BUS_PROPERTY("CanStop", "b", property_get_can_stop, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 681         SD_BUS_PROPERTY("CanReload", "b", property_get_can_reload, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 682         SD_BUS_PROPERTY("CanIsolate", "b", property_get_can_isolate, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 683         SD_BUS_PROPERTY("Job", "(uo)", property_get_job, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 684         SD_BUS_PROPERTY("StopWhenUnneeded", "b", bus_property_get_bool, offsetof(Unit, stop_when_unneeded), SD_BUS_VTABLE_PROPERTY_CONST),
 685         SD_BUS_PROPERTY("RefuseManualStart", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_start), SD_BUS_VTABLE_PROPERTY_CONST),
 686         SD_BUS_PROPERTY("RefuseManualStop", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_stop), SD_BUS_VTABLE_PROPERTY_CONST),
 687         SD_BUS_PROPERTY("AllowIsolate", "b", bus_property_get_bool, offsetof(Unit, allow_isolate), SD_BUS_VTABLE_PROPERTY_CONST),
 688         SD_BUS_PROPERTY("DefaultDependencies", "b", bus_property_get_bool, offsetof(Unit, default_dependencies), SD_BUS_VTABLE_PROPERTY_CONST),
 689         SD_BUS_PROPERTY("OnFailureJobMode", "s", property_get_job_mode, offsetof(Unit, on_failure_job_mode), SD_BUS_VTABLE_PROPERTY_CONST),
 690         SD_BUS_PROPERTY("IgnoreOnIsolate", "b", bus_property_get_bool, offsetof(Unit, ignore_on_isolate), SD_BUS_VTABLE_PROPERTY_CONST),
 691         SD_BUS_PROPERTY("NeedDaemonReload", "b", property_get_need_daemon_reload, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 692         SD_BUS_PROPERTY("JobTimeoutUSec", "t", bus_property_get_usec, offsetof(Unit, job_timeout), SD_BUS_VTABLE_PROPERTY_CONST),
 693         SD_BUS_PROPERTY("JobTimeoutAction", "s", property_get_failure_action, offsetof(Unit, job_timeout_action), SD_BUS_VTABLE_PROPERTY_CONST),
 694         SD_BUS_PROPERTY("JobTimeoutRebootArgument", "s", NULL, offsetof(Unit, job_timeout_reboot_arg), SD_BUS_VTABLE_PROPERTY_CONST),
 695         SD_BUS_PROPERTY("ConditionResult", "b", bus_property_get_bool, offsetof(Unit, condition_result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 696         SD_BUS_PROPERTY("AssertResult", "b", bus_property_get_bool, offsetof(Unit, assert_result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 697         BUS_PROPERTY_DUAL_TIMESTAMP("ConditionTimestamp", offsetof(Unit, condition_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 698         BUS_PROPERTY_DUAL_TIMESTAMP("AssertTimestamp", offsetof(Unit, assert_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 699         SD_BUS_PROPERTY("Conditions", "a(sbbsi)", property_get_conditions, offsetof(Unit, conditions), 0),
 700         SD_BUS_PROPERTY("Asserts", "a(sbbsi)", property_get_conditions, offsetof(Unit, asserts), 0),
 701         SD_BUS_PROPERTY("LoadError", "(ss)", property_get_load_error, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 702         SD_BUS_PROPERTY("Transient", "b", bus_property_get_bool, offsetof(Unit, transient), SD_BUS_VTABLE_PROPERTY_CONST),
 703         SD_BUS_PROPERTY("StartLimitIntervalSec", "t", bus_property_get_usec, offsetof(Unit, start_limit.interval), SD_BUS_VTABLE_PROPERTY_CONST),
 704         SD_BUS_PROPERTY("StartLimitBurst", "u", bus_property_get_unsigned, offsetof(Unit, start_limit.burst), SD_BUS_VTABLE_PROPERTY_CONST),
 705         SD_BUS_PROPERTY("StartLimitAction", "s", property_get_failure_action, offsetof(Unit, start_limit_action), SD_BUS_VTABLE_PROPERTY_CONST),
 706         SD_BUS_PROPERTY("RebootArgument", "s", NULL, offsetof(Unit, reboot_arg), SD_BUS_VTABLE_PROPERTY_CONST),
 707
 708         SD_BUS_METHOD("Start", "s", "o", method_start, SD_BUS_VTABLE_UNPRIVILEGED),
 709         SD_BUS_METHOD("Stop", "s", "o", method_stop, SD_BUS_VTABLE_UNPRIVILEGED),
 710         SD_BUS_METHOD("Reload", "s", "o", method_reload, SD_BUS_VTABLE_UNPRIVILEGED),
 711         SD_BUS_METHOD("Restart", "s", "o", method_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 712         SD_BUS_METHOD("TryRestart", "s", "o", method_try_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 713         SD_BUS_METHOD("ReloadOrRestart", "s", "o", method_reload_or_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 714         SD_BUS_METHOD("ReloadOrTryRestart", "s", "o", method_reload_or_try_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 715         SD_BUS_METHOD("Kill", "si", NULL, bus_unit_method_kill, SD_BUS_VTABLE_UNPRIVILEGED),
 716         SD_BUS_METHOD("ResetFailed", NULL, NULL, bus_unit_method_reset_failed, SD_BUS_VTABLE_UNPRIVILEGED),
 717         SD_BUS_METHOD("SetProperties", "ba(sv)", NULL, bus_unit_method_set_properties, SD_BUS_VTABLE_UNPRIVILEGED),
 718
 719         /* Obsolete properties or obsolete alias names */
 720         SD_BUS_PROPERTY("RequiresOverridable", "as", property_get_obsolete_dependencies, 0, SD_BUS_VTABLE_HIDDEN),
 721         SD_BUS_PROPERTY("RequisiteOverridable", "as", property_get_obsolete_dependencies, 0, SD_BUS_VTABLE_HIDDEN),
 722         SD_BUS_PROPERTY("RequiredByOverridable", "as", property_get_obsolete_dependencies, 0, SD_BUS_VTABLE_HIDDEN),
 723         SD_BUS_PROPERTY("RequisiteOfOverridable", "as", property_get_obsolete_dependencies, 0, SD_BUS_VTABLE_HIDDEN),
 724         SD_BUS_PROPERTY("StartLimitInterval", "t", bus_property_get_usec, offsetof(Unit, start_limit.interval), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
 725         SD_BUS_VTABLE_END
 726 };
 727
 728 static int property_get_slice(
 729                 sd_bus *bus,
 730                 const char *path,
 731                 const char *interface,
 732                 const char *property,
 733                 sd_bus_message *reply,
 734                 void *userdata,
 735                 sd_bus_error *error) {
 736
 737         Unit *u = userdata;
 738
 739         assert(bus);
 740         assert(reply);
 741         assert(u);
 742
 743         return sd_bus_message_append(reply, "s", unit_slice_name(u));
 744 }
 745
 746 static int property_get_current_memory(
 747                 sd_bus *bus,
 748                 const char *path,
 749                 const char *interface,
 750                 const char *property,
 751                 sd_bus_message *reply,
 752                 void *userdata,
 753                 sd_bus_error *error) {
 754
 755         uint64_t sz = (uint64_t) -1;
 756         Unit *u = userdata;
 757         int r;
 758
 759         assert(bus);
 760         assert(reply);
 761         assert(u);
 762
 763         r = unit_get_memory_current(u, &sz);
 764         if (r < 0 && r != -ENODATA)
 765                 log_unit_warning_errno(u, r, "Failed to get memory.usage_in_bytes attribute: %m");
 766
 767         return sd_bus_message_append(reply, "t", sz);
 768 }
 769
 770 static int property_get_current_tasks(
 771                 sd_bus *bus,
 772                 const char *path,
 773                 const char *interface,
 774                 const char *property,
 775                 sd_bus_message *reply,
 776                 void *userdata,
 777                 sd_bus_error *error) {
 778
 779         uint64_t cn = (uint64_t) -1;
 780         Unit *u = userdata;
 781         int r;
 782
 783         assert(bus);
 784         assert(reply);
 785         assert(u);
 786
 787         r = unit_get_tasks_current(u, &cn);
 788         if (r < 0 && r != -ENODATA)
 789                 log_unit_warning_errno(u, r, "Failed to get pids.current attribute: %m");
 790
 791         return sd_bus_message_append(reply, "t", cn);
 792 }
 793
 794 static int property_get_cpu_usage(
 795                 sd_bus *bus,
 796                 const char *path,
 797                 const char *interface,
 798                 const char *property,
 799                 sd_bus_message *reply,
 800                 void *userdata,
 801                 sd_bus_error *error) {
 802
 803         nsec_t ns = (nsec_t) -1;
 804         Unit *u = userdata;
 805         int r;
 806
 807         assert(bus);
 808         assert(reply);
 809         assert(u);
 810
 811         r = unit_get_cpu_usage(u, &ns);
 812         if (r < 0 && r != -ENODATA)
 813                 log_unit_warning_errno(u, r, "Failed to get cpuacct.usage attribute: %m");
 814
 815         return sd_bus_message_append(reply, "t", ns);
 816 }
 817
 818 static int property_get_cgroup(
 819                 sd_bus *bus,
 820                 const char *path,
 821                 const char *interface,
 822                 const char *property,
 823                 sd_bus_message *reply,
 824                 void *userdata,
 825                 sd_bus_error *error) {
 826
 827         Unit *u = userdata;
 828         const char *t;
 829
 830         assert(bus);
 831         assert(reply);
 832         assert(u);
 833
 834         /* Three cases: a) u->cgroup_path is NULL, in which case the
 835          * unit has no control group, which we report as the empty
 836          * string. b) u->cgroup_path is the empty string, which
 837          * indicates the root cgroup, which we report as "/". c) all
 838          * other cases we report as-is. */
 839
 840         if (u->cgroup_path)
 841                 t = isempty(u->cgroup_path) ? "/" : u->cgroup_path;
 842         else
 843                 t = "";
 844
 845         return sd_bus_message_append(reply, "s", t);
 846 }
 847
 848 static int append_process(sd_bus_message *reply, const char *p, pid_t pid, Set *pids) {
 849         _cleanup_free_ char *buf = NULL, *cmdline = NULL;
 850         int r;
 851
 852         assert(reply);
 853         assert(pid > 0);
 854
 855         r = set_put(pids, PID_TO_PTR(pid));
 856         if (r == -EEXIST || r == 0)
 857                 return 0;
 858         if (r < 0)
 859                 return r;
 860
 861         if (!p) {
 862                 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &buf);
 863                 if (r == -ESRCH)
 864                         return 0;
 865                 if (r < 0)
 866                         return r;
 867
 868                 p = buf;
 869         }
 870
 871         (void) get_process_cmdline(pid, 0, true, &cmdline);
 872
 873         return sd_bus_message_append(reply,
 874                                      "(sus)",
 875                                      p,
 876                                      (uint32_t) pid,
 877                                      cmdline);
 878 }
 879
 880 static int append_cgroup(sd_bus_message *reply, const char *p, Set *pids) {
 881         _cleanup_closedir_ DIR *d = NULL;
 882         _cleanup_fclose_ FILE *f = NULL;
 883         int r;
 884
 885         assert(reply);
 886         assert(p);
 887
 888         r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, p, &f);
 889         if (r == ENOENT)
 890                 return 0;
 891         if (r < 0)
 892                 return r;
 893
 894         for (;;) {
 895                 pid_t pid;
 896
 897                 r = cg_read_pid(f, &pid);
 898                 if (r < 0)
 899                         return r;
 900                 if (r == 0)
 901                         break;
 902
 903                 if (is_kernel_thread(pid) > 0)
 904                         continue;
 905
 906                 r = append_process(reply, p, pid, pids);
 907                 if (r < 0)
 908                         return r;
 909         }
 910
 911         r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, p, &d);
 912         if (r == -ENOENT)
 913                 return 0;
 914         if (r < 0)
 915                 return r;
 916
 917         for (;;) {
 918                 _cleanup_free_ char *g = NULL, *j = NULL;
 919
 920                 r = cg_read_subgroup(d, &g);
 921                 if (r < 0)
 922                         return r;
 923                 if (r == 0)
 924                         break;
 925
 926                 j = strjoin(p, "/", g, NULL);
 927                 if (!j)
 928                         return -ENOMEM;
 929
 930                 r = append_cgroup(reply, j, pids);
 931                 if (r < 0)
 932                         return r;
 933         }
 934
 935         return 0;
 936 }
 937
 938 int bus_unit_method_get_processes(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 939         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 940         _cleanup_(set_freep) Set *pids = NULL;
 941         Unit *u = userdata;
 942         pid_t pid;
 943         int r;
 944
 945         assert(message);
 946
 947         pids = set_new(NULL);
 948         if (!pids)
 949                 return -ENOMEM;
 950
 951         r = sd_bus_message_new_method_return(message, &reply);
 952         if (r < 0)
 953                 return r;
 954
 955         r = sd_bus_message_open_container(reply, 'a', "(sus)");
 956         if (r < 0)
 957                 return r;
 958
 959         if (u->cgroup_path) {
 960                 r = append_cgroup(reply, u->cgroup_path, pids);
 961                 if (r < 0)
 962                         return r;
 963         }
 964
 965         /* The main and control pids might live outside of the cgroup, hence fetch them separately */
 966         pid = unit_main_pid(u);
 967         if (pid > 0) {
 968                 r = append_process(reply, NULL, pid, pids);
 969                 if (r < 0)
 970                         return r;
 971         }
 972
 973         pid = unit_control_pid(u);
 974         if (pid > 0) {
 975                 r = append_process(reply, NULL, pid, pids);
 976                 if (r < 0)
 977                         return r;
 978         }
 979
 980         r = sd_bus_message_close_container(reply);
 981         if (r < 0)
 982                 return r;
 983
 984         return sd_bus_send(NULL, reply, NULL);
 985 }
 986
 987 const sd_bus_vtable bus_unit_cgroup_vtable[] = {
 988         SD_BUS_VTABLE_START(0),
 989         SD_BUS_PROPERTY("Slice", "s", property_get_slice, 0, 0),
 990         SD_BUS_PROPERTY("ControlGroup", "s", property_get_cgroup, 0, 0),
 991         SD_BUS_PROPERTY("MemoryCurrent", "t", property_get_current_memory, 0, 0),
 992         SD_BUS_PROPERTY("CPUUsageNSec", "t", property_get_cpu_usage, 0, 0),
 993         SD_BUS_PROPERTY("TasksCurrent", "t", property_get_current_tasks, 0, 0),
 994         SD_BUS_METHOD("GetProcesses", NULL, "a(sus)", bus_unit_method_get_processes, SD_BUS_VTABLE_UNPRIVILEGED),
 995         SD_BUS_VTABLE_END
 996 };
 997
 998 static int send_new_signal(sd_bus *bus, void *userdata) {
 999         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1000         _cleanup_free_ char *p = NULL;
1001         Unit *u = userdata;
1002         int r;
1003
1004         assert(bus);
1005         assert(u);
1006
1007         p = unit_dbus_path(u);
1008         if (!p)
1009                 return -ENOMEM;
1010
1011         r = sd_bus_message_new_signal(
1012                         bus,
1013                         &m,
1014                         "/org/freedesktop/systemd1",
1015                         "org.freedesktop.systemd1.Manager",
1016                         "UnitNew");
1017         if (r < 0)
1018                 return r;
1019
1020         r = sd_bus_message_append(m, "so", u->id, p);
1021         if (r < 0)
1022                 return r;
1023
1024         return sd_bus_send(bus, m, NULL);
1025 }
1026
1027 static int send_changed_signal(sd_bus *bus, void *userdata) {
1028         _cleanup_free_ char *p = NULL;
1029         Unit *u = userdata;
1030         int r;
1031
1032         assert(bus);
1033         assert(u);
1034
1035         p = unit_dbus_path(u);
1036         if (!p)
1037                 return -ENOMEM;
1038
1039         /* Send a properties changed signal. First for the specific
1040          * type, then for the generic unit. The clients may rely on
1041          * this order to get atomic behavior if needed. */
1042
1043         r = sd_bus_emit_properties_changed_strv(
1044                         bus, p,
1045                         unit_dbus_interface_from_type(u->type),
1046                         NULL);
1047         if (r < 0)
1048                 return r;
1049
1050         return sd_bus_emit_properties_changed_strv(
1051                         bus, p,
1052                         "org.freedesktop.systemd1.Unit",
1053                         NULL);
1054 }
1055
1056 void bus_unit_send_change_signal(Unit *u) {
1057         int r;
1058         assert(u);
1059
1060         if (u->in_dbus_queue) {
1061                 LIST_REMOVE(dbus_queue, u->manager->dbus_unit_queue, u);
1062                 u->in_dbus_queue = false;
1063         }
1064
1065         if (!u->id)
1066                 return;
1067
1068         r = bus_foreach_bus(u->manager, NULL, u->sent_dbus_new_signal ? send_changed_signal : send_new_signal, u);
1069         if (r < 0)
1070                 log_unit_debug_errno(u, r, "Failed to send unit change signal for %s: %m", u->id);
1071
1072         u->sent_dbus_new_signal = true;
1073 }
1074
1075 static int send_removed_signal(sd_bus *bus, void *userdata) {
1076         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1077         _cleanup_free_ char *p = NULL;
1078         Unit *u = userdata;
1079         int r;
1080
1081         assert(bus);
1082         assert(u);
1083
1084         p = unit_dbus_path(u);
1085         if (!p)
1086                 return -ENOMEM;
1087
1088         r = sd_bus_message_new_signal(
1089                         bus,
1090                         &m,
1091                         "/org/freedesktop/systemd1",
1092                         "org.freedesktop.systemd1.Manager",
1093                         "UnitRemoved");
1094         if (r < 0)
1095                 return r;
1096
1097         r = sd_bus_message_append(m, "so", u->id, p);
1098         if (r < 0)
1099                 return r;
1100
1101         return sd_bus_send(bus, m, NULL);
1102 }
1103
1104 void bus_unit_send_removed_signal(Unit *u) {
1105         int r;
1106         assert(u);
1107
1108         if (!u->sent_dbus_new_signal)
1109                 bus_unit_send_change_signal(u);
1110
1111         if (!u->id)
1112                 return;
1113
1114         r = bus_foreach_bus(u->manager, NULL, send_removed_signal, u);
1115         if (r < 0)
1116                 log_unit_debug_errno(u, r, "Failed to send unit remove signal for %s: %m", u->id);
1117 }
1118
1119 int bus_unit_queue_job(
1120                 sd_bus_message *message,
1121                 Unit *u,
1122                 JobType type,
1123                 JobMode mode,
1124                 bool reload_if_possible,
1125                 sd_bus_error *error) {
1126
1127         _cleanup_free_ char *path = NULL;
1128         Job *j;
1129         int r;
1130
1131         assert(message);
1132         assert(u);
1133         assert(type >= 0 && type < _JOB_TYPE_MAX);
1134         assert(mode >= 0 && mode < _JOB_MODE_MAX);
1135
1136         r = mac_selinux_unit_access_check(
1137                         u, message,
1138                         job_type_to_access_method(type),
1139                         error);
1140         if (r < 0)
1141                 return r;
1142
1143         if (reload_if_possible && unit_can_reload(u)) {
1144                 if (type == JOB_RESTART)
1145                         type = JOB_RELOAD_OR_START;
1146                 else if (type == JOB_TRY_RESTART)
1147                         type = JOB_TRY_RELOAD;
1148         }
1149
1150         if (type == JOB_STOP &&
1151             (u->load_state == UNIT_NOT_FOUND || u->load_state == UNIT_ERROR) &&
1152             unit_active_state(u) == UNIT_INACTIVE)
1153                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not loaded.", u->id);
1154
1155         if ((type == JOB_START && u->refuse_manual_start) ||
1156             (type == JOB_STOP && u->refuse_manual_stop) ||
1157             ((type == JOB_RESTART || type == JOB_TRY_RESTART) && (u->refuse_manual_start || u->refuse_manual_stop)) ||
1158             (type == JOB_RELOAD_OR_START && job_type_collapse(type, u) == JOB_START && u->refuse_manual_start))
1159                 return sd_bus_error_setf(error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, unit %s may be requested by dependency only.", u->id);
1160
1161         r = manager_add_job(u->manager, type, u, mode, error, &j);
1162         if (r < 0)
1163                 return r;
1164
1165         if (sd_bus_message_get_bus(message) == u->manager->api_bus) {
1166                 if (!j->clients) {
1167                         r = sd_bus_track_new(sd_bus_message_get_bus(message), &j->clients, NULL, NULL);
1168                         if (r < 0)
1169                                 return r;
1170                 }
1171
1172                 r = sd_bus_track_add_sender(j->clients, message);
1173                 if (r < 0)
1174                         return r;
1175         }
1176
1177         path = job_dbus_path(j);
1178         if (!path)
1179                 return -ENOMEM;
1180
1181         return sd_bus_reply_method_return(message, "o", path);
1182 }
1183
1184 static int bus_unit_set_transient_property(
1185                 Unit *u,
1186                 const char *name,
1187                 sd_bus_message *message,
1188                 UnitSetPropertiesMode mode,
1189                 sd_bus_error *error) {
1190
1191         int r;
1192
1193         assert(u);
1194         assert(name);
1195         assert(message);
1196
1197         if (streq(name, "Description")) {
1198                 const char *d;
1199
1200                 r = sd_bus_message_read(message, "s", &d);
1201                 if (r < 0)
1202                         return r;
1203
1204                 if (mode != UNIT_CHECK) {
1205                         r = unit_set_description(u, d);
1206                         if (r < 0)
1207                                 return r;
1208
1209                         unit_write_drop_in_format(u, mode, name, "[Unit]\nDescription=%s", d);
1210                 }
1211
1212                 return 1;
1213
1214         } else if (streq(name, "DefaultDependencies")) {
1215                 int b;
1216
1217                 r = sd_bus_message_read(message, "b", &b);
1218                 if (r < 0)
1219                         return r;
1220
1221                 if (mode != UNIT_CHECK) {
1222                         u->default_dependencies = b;
1223                         unit_write_drop_in_format(u, mode, name, "[Unit]\nDefaultDependencies=%s", yes_no(b));
1224                 }
1225
1226                 return 1;
1227
1228         } else if (streq(name, "Slice")) {
1229                 Unit *slice;
1230                 const char *s;
1231
1232                 if (!UNIT_HAS_CGROUP_CONTEXT(u))
1233                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "The slice property is only available for units with control groups.");
1234                 if (u->type == UNIT_SLICE)
1235                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Slice may not be set for slice units.");
1236                 if (unit_has_name(u, SPECIAL_INIT_SCOPE))
1237                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Cannot set slice for init.scope");
1238
1239                 r = sd_bus_message_read(message, "s", &s);
1240                 if (r < 0)
1241                         return r;
1242
1243                 if (!unit_name_is_valid(s, UNIT_NAME_PLAIN))
1244                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name '%s'", s);
1245
1246                 /* Note that we do not dispatch the load queue here yet, as we don't want our own transient unit to be
1247                  * loaded while we are still setting it up. Or in other words, we use manager_load_unit_prepare()
1248                  * instead of manager_load_unit() on purpose, here. */
1249                 r = manager_load_unit_prepare(u->manager, s, NULL, error, &slice);
1250                 if (r < 0)
1251                         return r;
1252
1253                 if (slice->type != UNIT_SLICE)
1254                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unit name '%s' is not a slice", s);
1255
1256                 if (mode != UNIT_CHECK) {
1257                         r = unit_set_slice(u, slice);
1258                         if (r < 0)
1259                                 return r;
1260
1261                         unit_write_drop_in_private_format(u, mode, name, "Slice=%s", s);
1262                 }
1263
1264                 return 1;
1265
1266         } else if (STR_IN_SET(name,
1267                               "Requires", "RequiresOverridable",
1268                               "Requisite", "RequisiteOverridable",
1269                               "Wants",
1270                               "BindsTo",
1271                               "Conflicts",
1272                               "Before", "After",
1273                               "OnFailure",
1274                               "PropagatesReloadTo", "ReloadPropagatedFrom",
1275                               "PartOf")) {
1276
1277                 UnitDependency d;
1278                 const char *other;
1279
1280                 if (streq(name, "RequiresOverridable"))
1281                         d = UNIT_REQUIRES; /* redirect for obsolete unit dependency type */
1282                 else if (streq(name, "RequisiteOverridable"))
1283                         d = UNIT_REQUISITE; /* same here */
1284                 else {
1285                         d = unit_dependency_from_string(name);
1286                         if (d < 0)
1287                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit dependency: %s", name);
1288                 }
1289
1290                 r = sd_bus_message_enter_container(message, 'a', "s");
1291                 if (r < 0)
1292                         return r;
1293
1294                 while ((r = sd_bus_message_read(message, "s", &other)) > 0) {
1295                         if (!unit_name_is_valid(other, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE))
1296                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name %s", other);
1297
1298                         if (mode != UNIT_CHECK) {
1299                                 _cleanup_free_ char *label = NULL;
1300
1301                                 r = unit_add_dependency_by_name(u, d, other, NULL, true);
1302                                 if (r < 0)
1303                                         return r;
1304
1305                                 label = strjoin(name, "-", other, NULL);
1306                                 if (!label)
1307                                         return -ENOMEM;
1308
1309                                 unit_write_drop_in_format(u, mode, label, "[Unit]\n%s=%s", name, other);
1310                         }
1311
1312                 }
1313                 if (r < 0)
1314                         return r;
1315
1316                 r = sd_bus_message_exit_container(message);
1317                 if (r < 0)
1318                         return r;
1319
1320                 return 1;
1321         }
1322
1323         return 0;
1324 }
1325
1326 int bus_unit_set_properties(
1327                 Unit *u,
1328                 sd_bus_message *message,
1329                 UnitSetPropertiesMode mode,
1330                 bool commit,
1331                 sd_bus_error *error) {
1332
1333         bool for_real = false;
1334         unsigned n = 0;
1335         int r;
1336
1337         assert(u);
1338         assert(message);
1339
1340         /* We iterate through the array twice. First run we just check
1341          * if all passed data is valid, second run actually applies
1342          * it. This is to implement transaction-like behaviour without
1343          * actually providing full transactions. */
1344
1345         r = sd_bus_message_enter_container(message, 'a', "(sv)");
1346         if (r < 0)
1347                 return r;
1348
1349         for (;;) {
1350                 const char *name;
1351
1352                 r = sd_bus_message_enter_container(message, 'r', "sv");
1353                 if (r < 0)
1354                         return r;
1355                 if (r == 0) {
1356                         if (for_real || mode == UNIT_CHECK)
1357                                 break;
1358
1359                         /* Reached EOF. Let's try again, and this time for realz... */
1360                         r = sd_bus_message_rewind(message, false);
1361                         if (r < 0)
1362                                 return r;
1363
1364                         for_real = true;
1365                         continue;
1366                 }
1367
1368                 r = sd_bus_message_read(message, "s", &name);
1369                 if (r < 0)
1370                         return r;
1371
1372                 if (!UNIT_VTABLE(u)->bus_set_property)
1373                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Objects of this type do not support setting properties.");
1374
1375                 r = sd_bus_message_enter_container(message, 'v', NULL);
1376                 if (r < 0)
1377                         return r;
1378
1379                 r = UNIT_VTABLE(u)->bus_set_property(u, name, message, for_real ? mode : UNIT_CHECK, error);
1380                 if (r == 0 && u->transient && u->load_state == UNIT_STUB)
1381                         r = bus_unit_set_transient_property(u, name, message, for_real ? mode : UNIT_CHECK, error);
1382                 if (r < 0)
1383                         return r;
1384                 if (r == 0)
1385                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Cannot set property %s, or unknown property.", name);
1386
1387                 r = sd_bus_message_exit_container(message);
1388                 if (r < 0)
1389                         return r;
1390
1391                 r = sd_bus_message_exit_container(message);
1392                 if (r < 0)
1393                         return r;
1394
1395                 n += for_real;
1396         }
1397
1398         r = sd_bus_message_exit_container(message);
1399         if (r < 0)
1400                 return r;
1401
1402         if (commit && n > 0 && UNIT_VTABLE(u)->bus_commit_properties)
1403                 UNIT_VTABLE(u)->bus_commit_properties(u);
1404
1405         return n;
1406 }
1407
1408 int bus_unit_check_load_state(Unit *u, sd_bus_error *error) {
1409         assert(u);
1410
1411         if (u->load_state == UNIT_LOADED)
1412                 return 0;
1413
1414         /* Give a better description of the unit error when
1415          * possible. Note that in the case of UNIT_MASKED, load_error
1416          * is not set. */
1417         if (u->load_state == UNIT_MASKED)
1418                 return sd_bus_error_setf(error, BUS_ERROR_UNIT_MASKED, "Unit %s is masked.", u->id);
1419
1420         if (u->load_state == UNIT_NOT_FOUND)
1421                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not found.", u->id);
1422
1423         return sd_bus_error_set_errnof(error, u->load_error, "Unit %s is not loaded properly: %m.", u->id);
1424 }