src/shared/bus-unit-util.c

   1 /***
   2   This file is part of elogind.
   3
   4   Copyright 2016 Lennart Poettering
   5
   6   elogind 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   elogind 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 elogind; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include "alloc-util.h"
  21 #include "bus-internal.h"
  22 #include "bus-unit-util.h"
  23 #include "bus-util.h"
  24 #include "cgroup-util.h"
  25 #include "env-util.h"
  26 #include "escape.h"
  27 #include "hashmap.h"
  28 #include "list.h"
  29 #include "locale-util.h"
  30 #include "parse-util.h"
  31 #include "path-util.h"
  32 #include "process-util.h"
  33 #include "rlimit-util.h"
  34 #include "signal-util.h"
  35 #include "string-util.h"
  36 #include "syslog-util.h"
  37 #include "terminal-util.h"
  38 #include "utf8.h"
  39 #include "util.h"
  40
  41 int bus_parse_unit_info(sd_bus_message *message, UnitInfo *u) {
  42         assert(message);
  43         assert(u);
  44
  45         u->machine = NULL;
  46
  47         return sd_bus_message_read(
  48                         message,
  49                         "(ssssssouso)",
  50                         &u->id,
  51                         &u->description,
  52                         &u->load_state,
  53                         &u->active_state,
  54                         &u->sub_state,
  55                         &u->following,
  56                         &u->unit_path,
  57                         &u->job_id,
  58                         &u->job_type,
  59                         &u->job_path);
  60 }
  61
  62 int bus_append_unit_property_assignment(sd_bus_message *m, const char *assignment) {
  63         const char *eq, *field;
  64         int r, rl;
  65
  66         assert(m);
  67         assert(assignment);
  68
  69         eq = strchr(assignment, '=');
  70         if (!eq) {
  71                 log_error("Not an assignment: %s", assignment);
  72                 return -EINVAL;
  73         }
  74
  75         r = sd_bus_message_open_container(m, SD_BUS_TYPE_STRUCT, "sv");
  76         if (r < 0)
  77                 return bus_log_create_error(r);
  78
  79         field = strndupa(assignment, eq - assignment);
  80         eq++;
  81
  82         if (streq(field, "CPUQuota")) {
  83
  84                 if (isempty(eq))
  85                         r = sd_bus_message_append(m, "sv", "CPUQuotaPerSecUSec", "t", USEC_INFINITY);
  86                 else if (endswith(eq, "%")) {
  87                         double percent;
  88
  89                         if (sscanf(eq, "%lf%%", &percent) != 1 || percent <= 0) {
  90                                 log_error("CPU quota '%s' invalid.", eq);
  91                                 return -EINVAL;
  92                         }
  93
  94                         r = sd_bus_message_append(m, "sv", "CPUQuotaPerSecUSec", "t", (usec_t) percent * USEC_PER_SEC / 100);
  95                 } else {
  96                         log_error("CPU quota needs to be in percent.");
  97                         return -EINVAL;
  98                 }
  99
 100                 goto finish;
 101
 102         } else if (streq(field, "EnvironmentFile")) {
 103
 104                 r = sd_bus_message_append(m, "sv", "EnvironmentFiles", "a(sb)", 1,
 105                                           eq[0] == '-' ? eq + 1 : eq,
 106                                           eq[0] == '-');
 107                 goto finish;
 108
 109         } else if (STR_IN_SET(field, "AccuracySec", "RandomizedDelaySec", "RuntimeMaxSec")) {
 110                 char *n;
 111                 usec_t t;
 112                 size_t l;
 113                 r = parse_sec(eq, &t);
 114                 if (r < 0)
 115                         return log_error_errno(r, "Failed to parse %s= parameter: %s", field, eq);
 116
 117                 l = strlen(field);
 118                 n = newa(char, l + 2);
 119                 if (!n)
 120                         return log_oom();
 121
 122                 /* Change suffix Sec → USec */
 123                 strcpy(mempcpy(n, field, l - 3), "USec");
 124                 r = sd_bus_message_append(m, "sv", n, "t", t);
 125                 goto finish;
 126         }
 127
 128         r = sd_bus_message_append_basic(m, SD_BUS_TYPE_STRING, field);
 129         if (r < 0)
 130                 return bus_log_create_error(r);
 131
 132         rl = rlimit_from_string(field);
 133         if (rl >= 0) {
 134                 const char *sn;
 135                 struct rlimit l;
 136
 137                 r = rlimit_parse(rl, eq, &l);
 138                 if (r < 0)
 139                         return log_error_errno(r, "Failed to parse resource limit: %s", eq);
 140
 141                 r = sd_bus_message_append(m, "v", "t", l.rlim_max);
 142                 if (r < 0)
 143                         return bus_log_create_error(r);
 144
 145                 r = sd_bus_message_close_container(m);
 146                 if (r < 0)
 147                         return bus_log_create_error(r);
 148
 149                 r = sd_bus_message_open_container(m, SD_BUS_TYPE_STRUCT, "sv");
 150                 if (r < 0)
 151                         return bus_log_create_error(r);
 152
 153                 sn = strjoina(field, "Soft");
 154                 r = sd_bus_message_append(m, "sv", sn, "t", l.rlim_cur);
 155
 156         } else if (STR_IN_SET(field,
 157                        "CPUAccounting", "MemoryAccounting", "BlockIOAccounting", "TasksAccounting",
 158                        "SendSIGHUP", "SendSIGKILL", "WakeSystem", "DefaultDependencies",
 159                        "IgnoreSIGPIPE", "TTYVHangup", "TTYReset", "RemainAfterExit",
 160                        "PrivateTmp", "PrivateDevices", "PrivateNetwork", "NoNewPrivileges",
 161                        "SyslogLevelPrefix", "Delegate", "RemainAfterElapse")) {
 162
 163                 r = parse_boolean(eq);
 164                 if (r < 0)
 165                         return log_error_errno(r, "Failed to parse boolean assignment %s.", assignment);
 166
 167                 r = sd_bus_message_append(m, "v", "b", r);
 168
 169         } else if (streq(field, "MemoryLimit")) {
 170                 uint64_t bytes;
 171
 172                 if (isempty(eq) || streq(eq, "infinity"))
 173                         bytes = (uint64_t) -1;
 174                 else {
 175                         r = parse_size(eq, 1024, &bytes);
 176                         if (r < 0) {
 177                                 log_error("Failed to parse bytes specification %s", assignment);
 178                                 return -EINVAL;
 179                         }
 180                 }
 181
 182                 r = sd_bus_message_append(m, "v", "t", bytes);
 183
 184         } else if (streq(field, "TasksMax")) {
 185                 uint64_t n;
 186
 187                 if (isempty(eq) || streq(eq, "infinity"))
 188                         n = (uint64_t) -1;
 189                 else {
 190                         r = safe_atou64(eq, &n);
 191                         if (r < 0) {
 192                                 log_error("Failed to parse maximum tasks specification %s", assignment);
 193                                 return -EINVAL;
 194                         }
 195                 }
 196
 197                 r = sd_bus_message_append(m, "v", "t", n);
 198
 199         } else if (STR_IN_SET(field, "CPUShares", "StartupCPUShares")) {
 200                 uint64_t u;
 201
 202                 r = cg_cpu_shares_parse(eq, &u);
 203                 if (r < 0) {
 204                         log_error("Failed to parse %s value %s.", field, eq);
 205                         return -EINVAL;
 206                 }
 207
 208                 r = sd_bus_message_append(m, "v", "t", u);
 209
 210         } else if (STR_IN_SET(field, "BlockIOWeight", "StartupBlockIOWeight")) {
 211                 uint64_t u;
 212
 213                 r = cg_cpu_shares_parse(eq, &u);
 214                 if (r < 0) {
 215                         log_error("Failed to parse %s value %s.", field, eq);
 216                         return -EINVAL;
 217                 }
 218
 219                 r = sd_bus_message_append(m, "v", "t", u);
 220
 221         } else if (STR_IN_SET(field,
 222                               "User", "Group", "DevicePolicy", "KillMode",
 223                               "UtmpIdentifier", "UtmpMode", "PAMName", "TTYPath",
 224                               "StandardInput", "StandardOutput", "StandardError",
 225                               "Description", "Slice", "Type", "WorkingDirectory",
 226                               "RootDirectory", "SyslogIdentifier", "ProtectSystem",
 227                               "ProtectHome"))
 228                 r = sd_bus_message_append(m, "v", "s", eq);
 229
 230         else if (streq(field, "SyslogLevel")) {
 231                 int level;
 232
 233                 level = log_level_from_string(eq);
 234                 if (level < 0) {
 235                         log_error("Failed to parse %s value %s.", field, eq);
 236                         return -EINVAL;
 237                 }
 238
 239                 r = sd_bus_message_append(m, "v", "i", level);
 240
 241         } else if (streq(field, "SyslogFacility")) {
 242                 int facility;
 243
 244                 facility = log_facility_unshifted_from_string(eq);
 245                 if (facility < 0) {
 246                         log_error("Failed to parse %s value %s.", field, eq);
 247                         return -EINVAL;
 248                 }
 249
 250                 r = sd_bus_message_append(m, "v", "i", facility);
 251
 252         } else if (streq(field, "DeviceAllow")) {
 253
 254                 if (isempty(eq))
 255                         r = sd_bus_message_append(m, "v", "a(ss)", 0);
 256                 else {
 257                         const char *path, *rwm, *e;
 258
 259                         e = strchr(eq, ' ');
 260                         if (e) {
 261                                 path = strndupa(eq, e - eq);
 262                                 rwm = e+1;
 263                         } else {
 264                                 path = eq;
 265                                 rwm = "";
 266                         }
 267
 268                         if (!path_startswith(path, "/dev")) {
 269                                 log_error("%s is not a device file in /dev.", path);
 270                                 return -EINVAL;
 271                         }
 272
 273                         r = sd_bus_message_append(m, "v", "a(ss)", 1, path, rwm);
 274                 }
 275
 276         } else if (STR_IN_SET(field, "BlockIOReadBandwidth", "BlockIOWriteBandwidth")) {
 277
 278                 if (isempty(eq))
 279                         r = sd_bus_message_append(m, "v", "a(st)", 0);
 280                 else {
 281                         const char *path, *bandwidth, *e;
 282                         uint64_t bytes;
 283
 284                         e = strchr(eq, ' ');
 285                         if (e) {
 286                                 path = strndupa(eq, e - eq);
 287                                 bandwidth = e+1;
 288                         } else {
 289                                 log_error("Failed to parse %s value %s.", field, eq);
 290                                 return -EINVAL;
 291                         }
 292
 293                         if (!path_startswith(path, "/dev")) {
 294                                 log_error("%s is not a device file in /dev.", path);
 295                                 return -EINVAL;
 296                         }
 297
 298                         r = parse_size(bandwidth, 1000, &bytes);
 299                         if (r < 0) {
 300                                 log_error("Failed to parse byte value %s.", bandwidth);
 301                                 return -EINVAL;
 302                         }
 303
 304                         r = sd_bus_message_append(m, "v", "a(st)", 1, path, bytes);
 305                 }
 306
 307         } else if (streq(field, "BlockIODeviceWeight")) {
 308
 309                 if (isempty(eq))
 310                         r = sd_bus_message_append(m, "v", "a(st)", 0);
 311                 else {
 312                         const char *path, *weight, *e;
 313                         uint64_t u;
 314
 315                         e = strchr(eq, ' ');
 316                         if (e) {
 317                                 path = strndupa(eq, e - eq);
 318                                 weight = e+1;
 319                         } else {
 320                                 log_error("Failed to parse %s value %s.", field, eq);
 321                                 return -EINVAL;
 322                         }
 323
 324                         if (!path_startswith(path, "/dev")) {
 325                                 log_error("%s is not a device file in /dev.", path);
 326                                 return -EINVAL;
 327                         }
 328
 329                         r = safe_atou64(weight, &u);
 330                         if (r < 0) {
 331                                 log_error("Failed to parse %s value %s.", field, weight);
 332                                 return -EINVAL;
 333                         }
 334                         r = sd_bus_message_append(m, "v", "a(st)", path, u);
 335                 }
 336
 337         } else if (streq(field, "Nice")) {
 338                 int32_t i;
 339
 340                 r = safe_atoi32(eq, &i);
 341                 if (r < 0) {
 342                         log_error("Failed to parse %s value %s.", field, eq);
 343                         return -EINVAL;
 344                 }
 345
 346                 r = sd_bus_message_append(m, "v", "i", i);
 347
 348         } else if (STR_IN_SET(field, "Environment", "PassEnvironment")) {
 349                 const char *p;
 350
 351                 r = sd_bus_message_open_container(m, 'v', "as");
 352                 if (r < 0)
 353                         return bus_log_create_error(r);
 354
 355                 r = sd_bus_message_open_container(m, 'a', "s");
 356                 if (r < 0)
 357                         return bus_log_create_error(r);
 358
 359                 p = eq;
 360
 361                 for (;;) {
 362                         _cleanup_free_ char *word = NULL;
 363
 364                         r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_CUNESCAPE);
 365                         if (r < 0) {
 366                                 log_error("Failed to parse Environment value %s", eq);
 367                                 return -EINVAL;
 368                         }
 369                         if (r == 0)
 370                                 break;
 371
 372                         if (streq(field, "Environment")) {
 373                                 if (!env_assignment_is_valid(word)) {
 374                                         log_error("Invalid environment assignment: %s", word);
 375                                         return -EINVAL;
 376                                 }
 377                         } else {  /* PassEnvironment */
 378                                 if (!env_name_is_valid(word)) {
 379                                         log_error("Invalid environment variable name: %s", word);
 380                                         return -EINVAL;
 381                                 }
 382                         }
 383
 384                         r = sd_bus_message_append_basic(m, 's', word);
 385                         if (r < 0)
 386                                 return bus_log_create_error(r);
 387                 }
 388
 389                 r = sd_bus_message_close_container(m);
 390                 if (r < 0)
 391                         return bus_log_create_error(r);
 392
 393                 r = sd_bus_message_close_container(m);
 394
 395         } else if (streq(field, "KillSignal")) {
 396                 int sig;
 397
 398                 sig = signal_from_string_try_harder(eq);
 399                 if (sig < 0) {
 400                         log_error("Failed to parse %s value %s.", field, eq);
 401                         return -EINVAL;
 402                 }
 403
 404                 r = sd_bus_message_append(m, "v", "i", sig);
 405
 406         } else if (streq(field, "TimerSlackNSec")) {
 407                 nsec_t n;
 408
 409                 r = parse_nsec(eq, &n);
 410                 if (r < 0) {
 411                         log_error("Failed to parse %s value %s", field, eq);
 412                         return -EINVAL;
 413                 }
 414
 415                 r = sd_bus_message_append(m, "v", "t", n);
 416         } else if (streq(field, "OOMScoreAdjust")) {
 417                 int oa;
 418
 419                 r = safe_atoi(eq, &oa);
 420                 if (r < 0) {
 421                         log_error("Failed to parse %s value %s", field, eq);
 422                         return -EINVAL;
 423                 }
 424
 425                 if (!oom_score_adjust_is_valid(oa)) {
 426                         log_error("OOM score adjust value out of range");
 427                         return -EINVAL;
 428                 }
 429
 430                 r = sd_bus_message_append(m, "v", "i", oa);
 431         } else if (STR_IN_SET(field, "ReadWriteDirectories", "ReadOnlyDirectories", "InaccessibleDirectories")) {
 432                 const char *p;
 433
 434                 r = sd_bus_message_open_container(m, 'v', "as");
 435                 if (r < 0)
 436                         return bus_log_create_error(r);
 437
 438                 r = sd_bus_message_open_container(m, 'a', "s");
 439                 if (r < 0)
 440                         return bus_log_create_error(r);
 441
 442                 p = eq;
 443
 444                 for (;;) {
 445                         _cleanup_free_ char *word = NULL;
 446                         int offset;
 447
 448                         r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES);
 449                         if (r < 0) {
 450                                 log_error("Failed to parse %s value %s", field, eq);
 451                                 return -EINVAL;
 452                         }
 453                         if (r == 0)
 454                                 break;
 455
 456                         if (!utf8_is_valid(word)) {
 457                                 log_error("Failed to parse %s value %s", field, eq);
 458                                 return -EINVAL;
 459                         }
 460
 461                         offset = word[0] == '-';
 462                         if (!path_is_absolute(word + offset)) {
 463                                 log_error("Failed to parse %s value %s", field, eq);
 464                                 return -EINVAL;
 465                         }
 466
 467                         path_kill_slashes(word + offset);
 468
 469                         r = sd_bus_message_append_basic(m, 's', word);
 470                         if (r < 0)
 471                                 return bus_log_create_error(r);
 472                 }
 473
 474                 r = sd_bus_message_close_container(m);
 475                 if (r < 0)
 476                         return bus_log_create_error(r);
 477
 478                 r = sd_bus_message_close_container(m);
 479
 480         } else if (streq(field, "RuntimeDirectory")) {
 481                 const char *p;
 482
 483                 r = sd_bus_message_open_container(m, 'v', "as");
 484                 if (r < 0)
 485                         return bus_log_create_error(r);
 486
 487                 r = sd_bus_message_open_container(m, 'a', "s");
 488                 if (r < 0)
 489                         return bus_log_create_error(r);
 490
 491                 p = eq;
 492
 493                 for (;;) {
 494                         _cleanup_free_ char *word = NULL;
 495
 496                         r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES);
 497                         if (r < 0)
 498                                 return log_error_errno(r, "Failed to parse %s value %s", field, eq);
 499
 500                         if (r == 0)
 501                                 break;
 502
 503                         r = sd_bus_message_append_basic(m, 's', word);
 504                         if (r < 0)
 505                                 return bus_log_create_error(r);
 506                 }
 507
 508                 r = sd_bus_message_close_container(m);
 509                 if (r < 0)
 510                         return bus_log_create_error(r);
 511
 512                 r = sd_bus_message_close_container(m);
 513
 514         } else {
 515                 log_error("Unknown assignment %s.", assignment);
 516                 return -EINVAL;
 517         }
 518
 519 finish:
 520         if (r < 0)
 521                 return bus_log_create_error(r);
 522
 523         r = sd_bus_message_close_container(m);
 524         if (r < 0)
 525                 return bus_log_create_error(r);
 526
 527         return 0;
 528 }
 529
 530 typedef struct BusWaitForJobs {
 531         sd_bus *bus;
 532         Set *jobs;
 533
 534         char *name;
 535         char *result;
 536
 537         sd_bus_slot *slot_job_removed;
 538         sd_bus_slot *slot_disconnected;
 539 } BusWaitForJobs;
 540
 541 static int match_disconnected(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 542         assert(m);
 543
 544         log_error("Warning! D-Bus connection terminated.");
 545         sd_bus_close(sd_bus_message_get_bus(m));
 546
 547         return 0;
 548 }
 549
 550 static int match_job_removed(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 551         const char *path, *unit, *result;
 552         BusWaitForJobs *d = userdata;
 553         uint32_t id;
 554         char *found;
 555         int r;
 556
 557         assert(m);
 558         assert(d);
 559
 560         r = sd_bus_message_read(m, "uoss", &id, &path, &unit, &result);
 561         if (r < 0) {
 562                 bus_log_parse_error(r);
 563                 return 0;
 564         }
 565
 566         found = set_remove(d->jobs, (char*) path);
 567         if (!found)
 568                 return 0;
 569
 570         free(found);
 571
 572         if (!isempty(result))
 573                 d->result = strdup(result);
 574
 575         if (!isempty(unit))
 576                 d->name = strdup(unit);
 577
 578         return 0;
 579 }
 580
 581 void bus_wait_for_jobs_free(BusWaitForJobs *d) {
 582         if (!d)
 583                 return;
 584
 585         set_free_free(d->jobs);
 586
 587         sd_bus_slot_unref(d->slot_disconnected);
 588         sd_bus_slot_unref(d->slot_job_removed);
 589
 590         sd_bus_unref(d->bus);
 591
 592         free(d->name);
 593         free(d->result);
 594
 595         free(d);
 596 }
 597
 598 int bus_wait_for_jobs_new(sd_bus *bus, BusWaitForJobs **ret) {
 599         _cleanup_(bus_wait_for_jobs_freep) BusWaitForJobs *d = NULL;
 600         int r;
 601
 602         assert(bus);
 603         assert(ret);
 604
 605         d = new0(BusWaitForJobs, 1);
 606         if (!d)
 607                 return -ENOMEM;
 608
 609         d->bus = sd_bus_ref(bus);
 610
 611         /* When we are a bus client we match by sender. Direct
 612          * connections OTOH have no initialized sender field, and
 613          * hence we ignore the sender then */
 614         r = sd_bus_add_match(
 615                         bus,
 616                         &d->slot_job_removed,
 617                         bus->bus_client ?
 618                         "type='signal',"
 619                         "sender='org.freedesktop.elogind1',"
 620                         "interface='org.freedesktop.elogind1.Manager',"
 621                         "member='JobRemoved',"
 622                         "path='/org/freedesktop/elogind1'" :
 623                         "type='signal',"
 624                         "interface='org.freedesktop.elogind1.Manager',"
 625                         "member='JobRemoved',"
 626                         "path='/org/freedesktop/elogind1'",
 627                         match_job_removed, d);
 628         if (r < 0)
 629                 return r;
 630
 631         r = sd_bus_add_match(
 632                         bus,
 633                         &d->slot_disconnected,
 634                         "type='signal',"
 635                         "sender='org.freedesktop.DBus.Local',"
 636                         "interface='org.freedesktop.DBus.Local',"
 637                         "member='Disconnected'",
 638                         match_disconnected, d);
 639         if (r < 0)
 640                 return r;
 641
 642         *ret = d;
 643         d = NULL;
 644
 645         return 0;
 646 }
 647
 648 static int bus_process_wait(sd_bus *bus) {
 649         int r;
 650
 651         for (;;) {
 652                 r = sd_bus_process(bus, NULL);
 653                 if (r < 0)
 654                         return r;
 655                 if (r > 0)
 656                         return 0;
 657
 658                 r = sd_bus_wait(bus, (uint64_t) -1);
 659                 if (r < 0)
 660                         return r;
 661         }
 662 }
 663
 664 static int bus_job_get_service_result(BusWaitForJobs *d, char **result) {
 665         _cleanup_free_ char *dbus_path = NULL;
 666
 667         assert(d);
 668         assert(d->name);
 669         assert(result);
 670
 671         dbus_path = unit_dbus_path_from_name(d->name);
 672         if (!dbus_path)
 673                 return -ENOMEM;
 674
 675         return sd_bus_get_property_string(d->bus,
 676                                           "org.freedesktop.elogind1",
 677                                           dbus_path,
 678                                           "org.freedesktop.elogind1.Service",
 679                                           "Result",
 680                                           NULL,
 681                                           result);
 682 }
 683
 684 static const struct {
 685         const char *result, *explanation;
 686 } explanations [] = {
 687         { "resources",   "a configured resource limit was exceeded" },
 688         { "timeout",     "a timeout was exceeded" },
 689         { "exit-code",   "the control process exited with error code" },
 690         { "signal",      "a fatal signal was delivered to the control process" },
 691         { "core-dump",   "a fatal signal was delivered causing the control process to dump core" },
 692         { "watchdog",    "the service failed to send watchdog ping" },
 693         { "start-limit", "start of the service was attempted too often" }
 694 };
 695
 696 static void log_job_error_with_service_result(const char* service, const char *result, const char* const* extra_args) {
 697         _cleanup_free_ char *service_shell_quoted = NULL;
 698         const char *systemctl = "systemctl", *journalctl = "journalctl";
 699
 700         assert(service);
 701
 702         service_shell_quoted = shell_maybe_quote(service);
 703
 704         if (extra_args && extra_args[1]) {
 705                 _cleanup_free_ char *t;
 706
 707                 t = strv_join((char**) extra_args, " ");
 708                 systemctl = strjoina("systemctl ", t ? : "<args>");
 709                 journalctl = strjoina("journalctl ", t ? : "<args>");
 710         }
 711
 712         if (!isempty(result)) {
 713                 unsigned i;
 714
 715                 for (i = 0; i < ELEMENTSOF(explanations); ++i)
 716                         if (streq(result, explanations[i].result))
 717                                 break;
 718
 719                 if (i < ELEMENTSOF(explanations)) {
 720                         log_error("Job for %s failed because %s.\n"
 721                                   "See \"%s status %s\" and \"%s -xe\" for details.\n",
 722                                   service,
 723                                   explanations[i].explanation,
 724                                   systemctl,
 725                                   service_shell_quoted ?: "<service>",
 726                                   journalctl);
 727                         goto finish;
 728                 }
 729         }
 730
 731         log_error("Job for %s failed.\n"
 732                   "See \"%s status %s\" and \"%s -xe\" for details.\n",
 733                   service,
 734                   systemctl,
 735                   service_shell_quoted ?: "<service>",
 736                   journalctl);
 737
 738 finish:
 739         /* For some results maybe additional explanation is required */
 740         if (streq_ptr(result, "start-limit"))
 741                 log_info("To force a start use \"%1$s reset-failed %2$s\"\n"
 742                          "followed by \"%1$s start %2$s\" again.",
 743                          systemctl,
 744                          service_shell_quoted ?: "<service>");
 745 }
 746
 747 static int check_wait_response(BusWaitForJobs *d, bool quiet, const char* const* extra_args) {
 748         int r = 0;
 749
 750         assert(d->result);
 751
 752         if (!quiet) {
 753                 if (streq(d->result, "canceled"))
 754                         log_error("Job for %s canceled.", strna(d->name));
 755                 else if (streq(d->result, "timeout"))
 756                         log_error("Job for %s timed out.", strna(d->name));
 757                 else if (streq(d->result, "dependency"))
 758                         log_error("A dependency job for %s failed. See 'journalctl -xe' for details.", strna(d->name));
 759                 else if (streq(d->result, "invalid"))
 760                         log_error("%s is not active, cannot reload.", strna(d->name));
 761                 else if (streq(d->result, "assert"))
 762                         log_error("Assertion failed on job for %s.", strna(d->name));
 763                 else if (streq(d->result, "unsupported"))
 764                         log_error("Operation on or unit type of %s not supported on this system.", strna(d->name));
 765                 else if (!streq(d->result, "done") && !streq(d->result, "skipped")) {
 766                         if (d->name) {
 767                                 int q;
 768                                 _cleanup_free_ char *result = NULL;
 769
 770                                 q = bus_job_get_service_result(d, &result);
 771                                 if (q < 0)
 772                                         log_debug_errno(q, "Failed to get Result property of service %s: %m", d->name);
 773
 774                                 log_job_error_with_service_result(d->name, result, extra_args);
 775                         } else
 776                                 log_error("Job failed. See \"journalctl -xe\" for details.");
 777                 }
 778         }
 779
 780         if (streq(d->result, "canceled"))
 781                 r = -ECANCELED;
 782         else if (streq(d->result, "timeout"))
 783                 r = -ETIME;
 784         else if (streq(d->result, "dependency"))
 785                 r = -EIO;
 786         else if (streq(d->result, "invalid"))
 787                 r = -ENOEXEC;
 788         else if (streq(d->result, "assert"))
 789                 r = -EPROTO;
 790         else if (streq(d->result, "unsupported"))
 791                 r = -EOPNOTSUPP;
 792         else if (!streq(d->result, "done") && !streq(d->result, "skipped"))
 793                 r = -EIO;
 794
 795         return r;
 796 }
 797
 798 int bus_wait_for_jobs(BusWaitForJobs *d, bool quiet, const char* const* extra_args) {
 799         int r = 0;
 800
 801         assert(d);
 802
 803         while (!set_isempty(d->jobs)) {
 804                 int q;
 805
 806                 q = bus_process_wait(d->bus);
 807                 if (q < 0)
 808                         return log_error_errno(q, "Failed to wait for response: %m");
 809
 810                 if (d->result) {
 811                         q = check_wait_response(d, quiet, extra_args);
 812                         /* Return the first error as it is most likely to be
 813                          * meaningful. */
 814                         if (q < 0 && r == 0)
 815                                 r = q;
 816
 817                         log_debug_errno(q, "Got result %s/%m for job %s", strna(d->result), strna(d->name));
 818                 }
 819
 820                 d->name = mfree(d->name);
 821                 d->result = mfree(d->result);
 822         }
 823
 824         return r;
 825 }
 826
 827 int bus_wait_for_jobs_add(BusWaitForJobs *d, const char *path) {
 828         int r;
 829
 830         assert(d);
 831
 832         r = set_ensure_allocated(&d->jobs, &string_hash_ops);
 833         if (r < 0)
 834                 return r;
 835
 836         return set_put_strdup(d->jobs, path);
 837 }
 838
 839 int bus_wait_for_jobs_one(BusWaitForJobs *d, const char *path, bool quiet) {
 840         int r;
 841
 842         r = bus_wait_for_jobs_add(d, path);
 843         if (r < 0)
 844                 return log_oom();
 845
 846         return bus_wait_for_jobs(d, quiet, NULL);
 847 }
 848
 849 int bus_deserialize_and_dump_unit_file_changes(sd_bus_message *m, bool quiet, UnitFileChange **changes, unsigned *n_changes) {
 850         const char *type, *path, *source;
 851         int r;
 852
 853         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "(sss)");
 854         if (r < 0)
 855                 return bus_log_parse_error(r);
 856
 857         while ((r = sd_bus_message_read(m, "(sss)", &type, &path, &source)) > 0) {
 858                 /* We expect only "success" changes to be sent over the bus.
 859                    Hence, reject anything negative. */
 860                 UnitFileChangeType ch = unit_file_change_type_from_string(type);
 861
 862                 if (ch < 0) {
 863                         log_notice("Manager reported unknown change type \"%s\" for path \"%s\", ignoring.", type, path);
 864                         continue;
 865                 }
 866
 867                 r = unit_file_changes_add(changes, n_changes, ch, path, source);
 868                 if (r < 0)
 869                         return r;
 870         }
 871         if (r < 0)
 872                 return bus_log_parse_error(r);
 873
 874         r = sd_bus_message_exit_container(m);
 875         if (r < 0)
 876                 return bus_log_parse_error(r);
 877
 878         unit_file_dump_changes(0, NULL, *changes, *n_changes, false);
 879         return 0;
 880 }
 881
 882 struct CGroupInfo {
 883         char *cgroup_path;
 884         bool is_const; /* If false, cgroup_path should be free()'d */
 885
 886         Hashmap *pids; /* PID → process name */
 887         bool done;
 888
 889         struct CGroupInfo *parent;
 890         LIST_FIELDS(struct CGroupInfo, siblings);
 891         LIST_HEAD(struct CGroupInfo, children);
 892         size_t n_children;
 893 };
 894
 895 static bool IS_ROOT(const char *p) {
 896         return isempty(p) || streq(p, "/");
 897 }
 898
 899 static int add_cgroup(Hashmap *cgroups, const char *path, bool is_const, struct CGroupInfo **ret) {
 900         struct CGroupInfo *parent = NULL, *cg;
 901         int r;
 902
 903         assert(cgroups);
 904         assert(ret);
 905
 906         if (IS_ROOT(path))
 907                 path = "/";
 908
 909         cg = hashmap_get(cgroups, path);
 910         if (cg) {
 911                 *ret = cg;
 912                 return 0;
 913         }
 914
 915         if (!IS_ROOT(path)) {
 916                 const char *e, *pp;
 917
 918                 e = strrchr(path, '/');
 919                 if (!e)
 920                         return -EINVAL;
 921
 922                 pp = strndupa(path, e - path);
 923                 if (!pp)
 924                         return -ENOMEM;
 925
 926                 r = add_cgroup(cgroups, pp, false, &parent);
 927                 if (r < 0)
 928                         return r;
 929         }
 930
 931         cg = new0(struct CGroupInfo, 1);
 932         if (!cg)
 933                 return -ENOMEM;
 934
 935         if (is_const)
 936                 cg->cgroup_path = (char*) path;
 937         else {
 938                 cg->cgroup_path = strdup(path);
 939                 if (!cg->cgroup_path) {
 940                         free(cg);
 941                         return -ENOMEM;
 942                 }
 943         }
 944
 945         cg->is_const = is_const;
 946         cg->parent = parent;
 947
 948         r = hashmap_put(cgroups, cg->cgroup_path, cg);
 949         if (r < 0) {
 950                 if (!is_const)
 951                         free(cg->cgroup_path);
 952                 free(cg);
 953                 return r;
 954         }
 955
 956         if (parent) {
 957                 LIST_PREPEND(siblings, parent->children, cg);
 958                 parent->n_children++;
 959         }
 960
 961         *ret = cg;
 962         return 1;
 963 }
 964
 965 static int add_process(
 966                 Hashmap *cgroups,
 967                 const char *path,
 968                 pid_t pid,
 969                 const char *name) {
 970
 971         struct CGroupInfo *cg;
 972         int r;
 973
 974         assert(cgroups);
 975         assert(name);
 976         assert(pid > 0);
 977
 978         r = add_cgroup(cgroups, path, true, &cg);
 979         if (r < 0)
 980                 return r;
 981
 982         r = hashmap_ensure_allocated(&cg->pids, &trivial_hash_ops);
 983         if (r < 0)
 984                 return r;
 985
 986         return hashmap_put(cg->pids, PID_TO_PTR(pid), (void*) name);
 987 }
 988
 989 static void remove_cgroup(Hashmap *cgroups, struct CGroupInfo *cg) {
 990         assert(cgroups);
 991         assert(cg);
 992
 993         while (cg->children)
 994                 remove_cgroup(cgroups, cg->children);
 995
 996         hashmap_remove(cgroups, cg->cgroup_path);
 997
 998         if (!cg->is_const)
 999                 free(cg->cgroup_path);
1000
1001         hashmap_free(cg->pids);
1002
1003         if (cg->parent)
1004                 LIST_REMOVE(siblings, cg->parent->children, cg);
1005
1006         free(cg);
1007 }
1008
1009 static int cgroup_info_compare_func(const void *a, const void *b) {
1010         const struct CGroupInfo *x = *(const struct CGroupInfo* const*) a, *y = *(const struct CGroupInfo* const*) b;
1011
1012         assert(x);
1013         assert(y);
1014
1015         return strcmp(x->cgroup_path, y->cgroup_path);
1016 }
1017
1018 static int dump_processes(
1019                 Hashmap *cgroups,
1020                 const char *cgroup_path,
1021                 const char *prefix,
1022                 unsigned n_columns,
1023                 OutputFlags flags) {
1024
1025         struct CGroupInfo *cg;
1026         int r;
1027
1028         assert(prefix);
1029
1030         if (IS_ROOT(cgroup_path))
1031                 cgroup_path = "/";
1032
1033         cg = hashmap_get(cgroups, cgroup_path);
1034         if (!cg)
1035                 return 0;
1036
1037         if (!hashmap_isempty(cg->pids)) {
1038                 const char *name;
1039                 size_t n = 0, i;
1040                 pid_t *pids;
1041                 void *pidp;
1042                 Iterator j;
1043                 int width;
1044
1045                 /* Order processes by their PID */
1046                 pids = newa(pid_t, hashmap_size(cg->pids));
1047
1048                 HASHMAP_FOREACH_KEY(name, pidp, cg->pids, j)
1049                         pids[n++] = PTR_TO_PID(pidp);
1050
1051                 assert(n == hashmap_size(cg->pids));
1052                 qsort_safe(pids, n, sizeof(pid_t), pid_compare_func);
1053
1054                 width = DECIMAL_STR_WIDTH(pids[n-1]);
1055
1056                 for (i = 0; i < n; i++) {
1057                         _cleanup_free_ char *e = NULL;
1058                         const char *special;
1059                         bool more;
1060
1061                         name = hashmap_get(cg->pids, PID_TO_PTR(pids[i]));
1062                         assert(name);
1063
1064                         if (n_columns != 0) {
1065                                 unsigned k;
1066
1067                                 k = MAX(LESS_BY(n_columns, 2U + width + 1U), 20U);
1068
1069                                 e = ellipsize(name, k, 100);
1070                                 if (e)
1071                                         name = e;
1072                         }
1073
1074                         more = i+1 < n || cg->children;
1075                         special = draw_special_char(more ? DRAW_TREE_BRANCH : DRAW_TREE_RIGHT);
1076
1077                         fprintf(stdout, "%s%s%*"PID_PRI" %s\n",
1078                                 prefix,
1079                                 special,
1080                                 width, pids[i],
1081                                 name);
1082                 }
1083         }
1084
1085         if (cg->children) {
1086                 struct CGroupInfo **children, *child;
1087                 size_t n = 0, i;
1088
1089                 /* Order subcgroups by their name */
1090                 children = newa(struct CGroupInfo*, cg->n_children);
1091                 LIST_FOREACH(siblings, child, cg->children)
1092                         children[n++] = child;
1093                 assert(n == cg->n_children);
1094                 qsort_safe(children, n, sizeof(struct CGroupInfo*), cgroup_info_compare_func);
1095
1096                 n_columns = MAX(LESS_BY(n_columns, 2U), 20U);
1097
1098                 for (i = 0; i < n; i++) {
1099                         _cleanup_free_ char *pp = NULL;
1100                         const char *name, *special;
1101                         bool more;
1102
1103                         child = children[i];
1104
1105                         name = strrchr(child->cgroup_path, '/');
1106                         if (!name)
1107                                 return -EINVAL;
1108                         name++;
1109
1110                         more = i+1 < n;
1111                         special = draw_special_char(more ? DRAW_TREE_BRANCH : DRAW_TREE_RIGHT);
1112
1113                         fputs(prefix, stdout);
1114                         fputs(special, stdout);
1115                         fputs(name, stdout);
1116                         fputc('\n', stdout);
1117
1118                         special = draw_special_char(more ? DRAW_TREE_VERTICAL : DRAW_TREE_SPACE);
1119
1120                         pp = strappend(prefix, special);
1121                         if (!pp)
1122                                 return -ENOMEM;
1123
1124                         r = dump_processes(cgroups, child->cgroup_path, pp, n_columns, flags);
1125                         if (r < 0)
1126                                 return r;
1127                 }
1128         }
1129
1130         cg->done = true;
1131         return 0;
1132 }
1133
1134 static int dump_extra_processes(
1135                 Hashmap *cgroups,
1136                 const char *prefix,
1137                 unsigned n_columns,
1138                 OutputFlags flags) {
1139
1140         _cleanup_free_ pid_t *pids = NULL;
1141         _cleanup_hashmap_free_ Hashmap *names = NULL;
1142         struct CGroupInfo *cg;
1143         size_t n_allocated = 0, n = 0, k;
1144         Iterator i;
1145         int width, r;
1146
1147         /* Prints the extra processes, i.e. those that are in cgroups we haven't displayed yet. We show them as
1148          * combined, sorted, linear list. */
1149
1150         HASHMAP_FOREACH(cg, cgroups, i) {
1151                 const char *name;
1152                 void *pidp;
1153                 Iterator j;
1154
1155                 if (cg->done)
1156                         continue;
1157
1158                 if (hashmap_isempty(cg->pids))
1159                         continue;
1160
1161                 r = hashmap_ensure_allocated(&names, &trivial_hash_ops);
1162                 if (r < 0)
1163                         return r;
1164
1165                 if (!GREEDY_REALLOC(pids, n_allocated, n + hashmap_size(cg->pids)))
1166                         return -ENOMEM;
1167
1168                 HASHMAP_FOREACH_KEY(name, pidp, cg->pids, j) {
1169                         pids[n++] = PTR_TO_PID(pidp);
1170
1171                         r = hashmap_put(names, pidp, (void*) name);
1172                         if (r < 0)
1173                                 return r;
1174                 }
1175         }
1176
1177         if (n == 0)
1178                 return 0;
1179
1180         qsort_safe(pids, n, sizeof(pid_t), pid_compare_func);
1181         width = DECIMAL_STR_WIDTH(pids[n-1]);
1182
1183         for (k = 0; k < n; k++) {
1184                 _cleanup_free_ char *e = NULL;
1185                 const char *name;
1186
1187                 name = hashmap_get(names, PID_TO_PTR(pids[k]));
1188                 assert(name);
1189
1190                 if (n_columns != 0) {
1191                         unsigned z;
1192
1193                         z = MAX(LESS_BY(n_columns, 2U + width + 1U), 20U);
1194
1195                         e = ellipsize(name, z, 100);
1196                         if (e)
1197                                 name = e;
1198                 }
1199
1200                 fprintf(stdout, "%s%s %*" PID_PRI " %s\n",
1201                         prefix,
1202                         draw_special_char(DRAW_TRIANGULAR_BULLET),
1203                         width, pids[k],
1204                         name);
1205         }
1206
1207         return 0;
1208 }
1209
1210 int unit_show_processes(
1211                 sd_bus *bus,
1212                 const char *unit,
1213                 const char *cgroup_path,
1214                 const char *prefix,
1215                 unsigned n_columns,
1216                 OutputFlags flags,
1217                 sd_bus_error *error) {
1218
1219         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1220         Hashmap *cgroups = NULL;
1221         struct CGroupInfo *cg;
1222         int r;
1223
1224         assert(bus);
1225         assert(unit);
1226
1227         if (flags & OUTPUT_FULL_WIDTH)
1228                 n_columns = 0;
1229         else if (n_columns <= 0)
1230                 n_columns = columns();
1231
1232         prefix = strempty(prefix);
1233
1234         r = sd_bus_call_method(
1235                         bus,
1236                         "org.freedesktop.elogind1",
1237                         "/org/freedesktop/elogind1",
1238                         "org.freedesktop.elogind1.Manager",
1239                         "GetUnitProcesses",
1240                         error,
1241                         &reply,
1242                         "s",
1243                         unit);
1244         if (r < 0)
1245                 return r;
1246
1247         cgroups = hashmap_new(&string_hash_ops);
1248         if (!cgroups)
1249                 return -ENOMEM;
1250
1251         r = sd_bus_message_enter_container(reply, 'a', "(sus)");
1252         if (r < 0)
1253                 goto finish;
1254
1255         for (;;) {
1256                 const char *path = NULL, *name = NULL;
1257                 uint32_t pid;
1258
1259                 r = sd_bus_message_read(reply, "(sus)", &path, &pid, &name);
1260                 if (r < 0)
1261                         goto finish;
1262                 if (r == 0)
1263                         break;
1264
1265                 r = add_process(cgroups, path, pid, name);
1266                 if (r < 0)
1267                         goto finish;
1268         }
1269
1270         r = sd_bus_message_exit_container(reply);
1271         if (r < 0)
1272                 goto finish;
1273
1274         r = dump_processes(cgroups, cgroup_path, prefix, n_columns, flags);
1275         if (r < 0)
1276                 goto finish;
1277
1278         r = dump_extra_processes(cgroups, prefix, n_columns, flags);
1279
1280 finish:
1281         while ((cg = hashmap_first(cgroups)))
1282                remove_cgroup(cgroups, cg);
1283
1284         hashmap_free(cgroups);
1285
1286         return r;
1287 }