src/manager.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <assert.h>
  23 #include <errno.h>
  24 #include <string.h>
  25 #include <sys/epoll.h>
  26 #include <signal.h>
  27 #include <sys/signalfd.h>
  28 #include <sys/wait.h>
  29 #include <unistd.h>
  30 #include <utmpx.h>
  31 #include <sys/poll.h>
  32 #include <sys/reboot.h>
  33 #include <sys/ioctl.h>
  34 #include <linux/kd.h>
  35 #include <libcgroup.h>
  36 #include <termios.h>
  37 #include <fcntl.h>
  38 #include <sys/types.h>
  39 #include <sys/stat.h>
  40
  41 #include "manager.h"
  42 #include "hashmap.h"
  43 #include "macro.h"
  44 #include "strv.h"
  45 #include "log.h"
  46 #include "util.h"
  47 #include "ratelimit.h"
  48 #include "cgroup.h"
  49 #include "mount-setup.h"
  50 #include "utmp-wtmp.h"
  51 #include "unit-name.h"
  52 #include "dbus-unit.h"
  53 #include "dbus-job.h"
  54 #include "missing.h"
  55
  56 /* As soon as 16 units are in our GC queue, make sure to run a gc sweep */
  57 #define GC_QUEUE_ENTRIES_MAX 16
  58
  59 /* As soon as 5s passed since a unit was added to our GC queue, make sure to run a gc sweep */
  60 #define GC_QUEUE_USEC_MAX (10*USEC_PER_SEC)
  61
  62 static int enable_special_signals(Manager *m) {
  63         char fd;
  64
  65         assert(m);
  66
  67         /* Enable that we get SIGINT on control-alt-del */
  68         if (reboot(RB_DISABLE_CAD) < 0)
  69                 log_warning("Failed to enable ctrl-alt-del handling: %m");
  70
  71         if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY)) < 0)
  72                 log_warning("Failed to open /dev/tty0: %m");
  73         else {
  74                 /* Enable that we get SIGWINCH on kbrequest */
  75                 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
  76                         log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
  77
  78                 close_nointr_nofail(fd);
  79         }
  80
  81         return 0;
  82 }
  83
  84 static int manager_setup_signals(Manager *m) {
  85         sigset_t mask;
  86         struct epoll_event ev;
  87         struct sigaction sa;
  88
  89         assert(m);
  90
  91         /* We are not interested in SIGSTOP and friends. */
  92         zero(sa);
  93         sa.sa_handler = SIG_DFL;
  94         sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
  95         assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
  96
  97         assert_se(sigemptyset(&mask) == 0);
  98         assert_se(sigaddset(&mask, SIGCHLD) == 0);
  99         assert_se(sigaddset(&mask, SIGTERM) == 0);
 100         assert_se(sigaddset(&mask, SIGHUP) == 0);
 101         assert_se(sigaddset(&mask, SIGUSR1) == 0);
 102         assert_se(sigaddset(&mask, SIGUSR2) == 0);
 103         assert_se(sigaddset(&mask, SIGINT) == 0);   /* Kernel sends us this on control-alt-del */
 104         assert_se(sigaddset(&mask, SIGWINCH) == 0); /* Kernel sends us this on kbrequest (alt-arrowup) */
 105         assert_se(sigaddset(&mask, SIGPWR) == 0);   /* Some kernel drivers and upsd send us this on power failure */
 106         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
 107
 108         m->signal_watch.type = WATCH_SIGNAL;
 109         if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
 110                 return -errno;
 111
 112         zero(ev);
 113         ev.events = EPOLLIN;
 114         ev.data.ptr = &m->signal_watch;
 115
 116         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
 117                 return -errno;
 118
 119         if (m->running_as == MANAGER_INIT)
 120                 return enable_special_signals(m);
 121
 122         return 0;
 123 }
 124
 125 static char** session_dirs(void) {
 126         const char *home, *e;
 127         char *config_home = NULL, *data_home = NULL;
 128         char **config_dirs = NULL, **data_dirs = NULL;
 129         char **r = NULL, **t;
 130
 131         /* Implement the mechanisms defined in
 132          *
 133          * http://standards.freedesktop.org/basedir-spec/basedir-spec-0.6.html
 134          *
 135          * We look in both the config and the data dirs because we
 136          * want to encourage that distributors ship their unit files
 137          * as data, and allow overriding as configuration.
 138          */
 139
 140         home = getenv("HOME");
 141
 142         if ((e = getenv("XDG_CONFIG_HOME"))) {
 143                 if (asprintf(&config_home, "%s/systemd/session", e) < 0)
 144                         goto fail;
 145
 146         } else if (home) {
 147                 if (asprintf(&config_home, "%s/.config/systemd/session", home) < 0)
 148                         goto fail;
 149         }
 150
 151         if ((e = getenv("XDG_CONFIG_DIRS")))
 152                 if (!(config_dirs = strv_split(e, ":")))
 153                         goto fail;
 154
 155         /* We don't treat /etc/xdg/systemd here as the spec
 156          * suggests because we assume that that is a link to
 157          * /etc/systemd/ anyway. */
 158
 159         if ((e = getenv("XDG_DATA_HOME"))) {
 160                 if (asprintf(&data_home, "%s/systemd/session", e) < 0)
 161                         goto fail;
 162
 163         } else if (home) {
 164                 if (asprintf(&data_home, "%s/.local/share/systemd/session", home) < 0)
 165                         goto fail;
 166         }
 167
 168         if ((e = getenv("XDG_DATA_DIRS")))
 169                 data_dirs = strv_split(e, ":");
 170         else
 171                 data_dirs = strv_new("/usr/local/share", "/usr/share", NULL);
 172
 173         if (!data_dirs)
 174                 goto fail;
 175
 176         /* Now merge everything we found. */
 177         if (config_home) {
 178                 if (!(t = strv_append(r, config_home)))
 179                         goto fail;
 180                 strv_free(r);
 181                 r = t;
 182         }
 183
 184         if (!(t = strv_merge_concat(r, config_dirs, "/systemd/session")))
 185                 goto finish;
 186         strv_free(r);
 187         r = t;
 188
 189         if (!(t = strv_append(r, SESSION_CONFIG_UNIT_PATH)))
 190                 goto fail;
 191         strv_free(r);
 192         r = t;
 193
 194         if (data_home) {
 195                 if (!(t = strv_append(r, data_home)))
 196                         goto fail;
 197                 strv_free(r);
 198                 r = t;
 199         }
 200
 201         if (!(t = strv_merge_concat(r, data_dirs, "/systemd/session")))
 202                 goto fail;
 203         strv_free(r);
 204         r = t;
 205
 206         if (!(t = strv_append(r, SESSION_DATA_UNIT_PATH)))
 207                 goto fail;
 208         strv_free(r);
 209         r = t;
 210
 211         if (!strv_path_make_absolute_cwd(r))
 212             goto fail;
 213
 214 finish:
 215         free(config_home);
 216         strv_free(config_dirs);
 217         free(data_home);
 218         strv_free(data_dirs);
 219
 220         return r;
 221
 222 fail:
 223         strv_free(r);
 224         r = NULL;
 225         goto finish;
 226 }
 227
 228 static int manager_find_paths(Manager *m) {
 229         const char *e;
 230         char *t;
 231
 232         assert(m);
 233
 234         /* First priority is whatever has been passed to us via env
 235          * vars */
 236         if ((e = getenv("SYSTEMD_UNIT_PATH")))
 237                 if (!(m->unit_path = split_path_and_make_absolute(e)))
 238                         return -ENOMEM;
 239
 240         if (strv_isempty(m->unit_path)) {
 241
 242                 /* Nothing is set, so let's figure something out. */
 243                 strv_free(m->unit_path);
 244
 245                 if (m->running_as == MANAGER_SESSION) {
 246                         if (!(m->unit_path = session_dirs()))
 247                                 return -ENOMEM;
 248                 } else
 249                         if (!(m->unit_path = strv_new(
 250                                               SYSTEM_CONFIG_UNIT_PATH,  /* /etc/systemd/system/ */
 251                                               SYSTEM_DATA_UNIT_PATH,    /* /lib/systemd/system/ */
 252                                               NULL)))
 253                                 return -ENOMEM;
 254         }
 255
 256         if (m->running_as == MANAGER_INIT) {
 257                 /* /etc/init.d/ compatibility does not matter to users */
 258
 259                 if ((e = getenv("SYSTEMD_SYSVINIT_PATH")))
 260                         if (!(m->sysvinit_path = split_path_and_make_absolute(e)))
 261                                 return -ENOMEM;
 262
 263                 if (strv_isempty(m->sysvinit_path)) {
 264                         strv_free(m->sysvinit_path);
 265
 266                         if (!(m->sysvinit_path = strv_new(
 267                                               SYSTEM_SYSVINIT_PATH,     /* /etc/init.d/ */
 268                                               NULL)))
 269                                 return -ENOMEM;
 270                 }
 271
 272                 if ((e = getenv("SYSTEMD_SYSVRCND_PATH")))
 273                         if (!(m->sysvrcnd_path = split_path_and_make_absolute(e)))
 274                                 return -ENOMEM;
 275
 276                 if (strv_isempty(m->sysvrcnd_path)) {
 277                         strv_free(m->sysvrcnd_path);
 278
 279                         if (!(m->sysvrcnd_path = strv_new(
 280                                               SYSTEM_SYSVRCND_PATH,     /* /etc/rcN.d/ */
 281                                               NULL)))
 282                                 return -ENOMEM;
 283                 }
 284         }
 285
 286         strv_uniq(m->unit_path);
 287         strv_uniq(m->sysvinit_path);
 288         strv_uniq(m->sysvrcnd_path);
 289
 290         assert(!strv_isempty(m->unit_path));
 291         if (!(t = strv_join(m->unit_path, "\n\t")))
 292                 return -ENOMEM;
 293         log_debug("Looking for unit files in:\n\t%s", t);
 294         free(t);
 295
 296         if (!strv_isempty(m->sysvinit_path)) {
 297
 298                 if (!(t = strv_join(m->sysvinit_path, "\n\t")))
 299                         return -ENOMEM;
 300
 301                 log_debug("Looking for SysV init scripts in:\n\t%s", t);
 302                 free(t);
 303         } else
 304                 log_debug("Ignoring SysV init scripts.");
 305
 306         if (!strv_isempty(m->sysvrcnd_path)) {
 307
 308                 if (!(t = strv_join(m->sysvrcnd_path, "\n\t")))
 309                         return -ENOMEM;
 310
 311                 log_debug("Looking for SysV rcN.d links in:\n\t%s", t);
 312                 free(t);
 313         } else
 314                 log_debug("Ignoring SysV rcN.d links.");
 315
 316         return 0;
 317 }
 318
 319 int manager_new(ManagerRunningAs running_as, bool confirm_spawn, Manager **_m) {
 320         Manager *m;
 321         int r = -ENOMEM;
 322
 323         assert(_m);
 324         assert(running_as >= 0);
 325         assert(running_as < _MANAGER_RUNNING_AS_MAX);
 326
 327         if (!(m = new0(Manager, 1)))
 328                 return -ENOMEM;
 329
 330         m->boot_timestamp = now(CLOCK_REALTIME);
 331
 332         m->running_as = running_as;
 333         m->confirm_spawn = confirm_spawn;
 334         m->name_data_slot = -1;
 335         m->exit_code = _MANAGER_EXIT_CODE_INVALID;
 336
 337         m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = -1;
 338         m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
 339
 340         if (!(m->environment = strv_copy(environ)))
 341                 goto fail;
 342
 343         if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
 344                 goto fail;
 345
 346         if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
 347                 goto fail;
 348
 349         if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
 350                 goto fail;
 351
 352         if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
 353                 goto fail;
 354
 355         if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
 356                 goto fail;
 357
 358         if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
 359                 goto fail;
 360
 361         if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
 362                 goto fail;
 363
 364         if ((r = manager_find_paths(m)) < 0)
 365                 goto fail;
 366
 367         if ((r = manager_setup_signals(m)) < 0)
 368                 goto fail;
 369
 370         if ((r = manager_setup_cgroup(m)) < 0)
 371                 goto fail;
 372
 373         /* Try to connect to the busses, if possible. */
 374         if ((r = bus_init_system(m)) < 0 ||
 375             (r = bus_init_api(m)) < 0)
 376                 goto fail;
 377
 378         *_m = m;
 379         return 0;
 380
 381 fail:
 382         manager_free(m);
 383         return r;
 384 }
 385
 386 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
 387         Meta *meta;
 388         unsigned n = 0;
 389
 390         assert(m);
 391
 392         while ((meta = m->cleanup_queue)) {
 393                 assert(meta->in_cleanup_queue);
 394
 395                 unit_free(UNIT(meta));
 396                 n++;
 397         }
 398
 399         return n;
 400 }
 401
 402 enum {
 403         GC_OFFSET_IN_PATH,  /* This one is on the path we were travelling */
 404         GC_OFFSET_UNSURE,   /* No clue */
 405         GC_OFFSET_GOOD,     /* We still need this unit */
 406         GC_OFFSET_BAD,      /* We don't need this unit anymore */
 407         _GC_OFFSET_MAX
 408 };
 409
 410 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
 411         Iterator i;
 412         Unit *other;
 413         bool is_bad;
 414
 415         assert(u);
 416
 417         if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
 418             u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
 419             u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
 420                 return;
 421
 422         if (u->meta.in_cleanup_queue)
 423                 goto bad;
 424
 425         if (unit_check_gc(u))
 426                 goto good;
 427
 428         u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
 429
 430         is_bad = true;
 431
 432         SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
 433                 unit_gc_sweep(other, gc_marker);
 434
 435                 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
 436                         goto good;
 437
 438                 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
 439                         is_bad = false;
 440         }
 441
 442         if (is_bad)
 443                 goto bad;
 444
 445         /* We were unable to find anything out about this entry, so
 446          * let's investigate it later */
 447         u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
 448         unit_add_to_gc_queue(u);
 449         return;
 450
 451 bad:
 452         /* We definitely know that this one is not useful anymore, so
 453          * let's mark it for deletion */
 454         u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
 455         unit_add_to_cleanup_queue(u);
 456         return;
 457
 458 good:
 459         u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
 460 }
 461
 462 static unsigned manager_dispatch_gc_queue(Manager *m) {
 463         Meta *meta;
 464         unsigned n = 0;
 465         unsigned gc_marker;
 466
 467         assert(m);
 468
 469         if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
 470             (m->gc_queue_timestamp <= 0 ||
 471              (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
 472                 return 0;
 473
 474         log_debug("Running GC...");
 475
 476         m->gc_marker += _GC_OFFSET_MAX;
 477         if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
 478                 m->gc_marker = 1;
 479
 480         gc_marker = m->gc_marker;
 481
 482         while ((meta = m->gc_queue)) {
 483                 assert(meta->in_gc_queue);
 484
 485                 unit_gc_sweep(UNIT(meta), gc_marker);
 486
 487                 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
 488                 meta->in_gc_queue = false;
 489
 490                 n++;
 491
 492                 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
 493                     meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
 494                         log_debug("Collecting %s", meta->id);
 495                         meta->gc_marker = gc_marker + GC_OFFSET_BAD;
 496                         unit_add_to_cleanup_queue(UNIT(meta));
 497                 }
 498         }
 499
 500         m->n_in_gc_queue = 0;
 501         m->gc_queue_timestamp = 0;
 502
 503         return n;
 504 }
 505
 506 static void manager_clear_jobs_and_units(Manager *m) {
 507         Job *j;
 508         Unit *u;
 509
 510         assert(m);
 511
 512         while ((j = hashmap_first(m->transaction_jobs)))
 513                 job_free(j);
 514
 515         while ((u = hashmap_first(m->units)))
 516                 unit_free(u);
 517 }
 518
 519 void manager_free(Manager *m) {
 520         UnitType c;
 521
 522         assert(m);
 523
 524         manager_dispatch_cleanup_queue(m);
 525         manager_clear_jobs_and_units(m);
 526
 527         for (c = 0; c < _UNIT_TYPE_MAX; c++)
 528                 if (unit_vtable[c]->shutdown)
 529                         unit_vtable[c]->shutdown(m);
 530
 531         /* If we reexecute ourselves, we keep the root cgroup
 532          * around */
 533         manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
 534
 535         bus_done_api(m);
 536         bus_done_system(m);
 537
 538         hashmap_free(m->units);
 539         hashmap_free(m->jobs);
 540         hashmap_free(m->transaction_jobs);
 541         hashmap_free(m->watch_pids);
 542         hashmap_free(m->watch_bus);
 543
 544         if (m->epoll_fd >= 0)
 545                 close_nointr_nofail(m->epoll_fd);
 546         if (m->signal_watch.fd >= 0)
 547                 close_nointr_nofail(m->signal_watch.fd);
 548
 549         strv_free(m->unit_path);
 550         strv_free(m->sysvinit_path);
 551         strv_free(m->sysvrcnd_path);
 552         strv_free(m->environment);
 553
 554         free(m->cgroup_controller);
 555         free(m->cgroup_hierarchy);
 556
 557         hashmap_free(m->cgroup_bondings);
 558
 559         free(m);
 560 }
 561
 562 int manager_enumerate(Manager *m) {
 563         int r = 0, q;
 564         UnitType c;
 565
 566         assert(m);
 567
 568         /* Let's ask every type to load all units from disk/kernel
 569          * that it might know */
 570         for (c = 0; c < _UNIT_TYPE_MAX; c++)
 571                 if (unit_vtable[c]->enumerate)
 572                         if ((q = unit_vtable[c]->enumerate(m)) < 0)
 573                                 r = q;
 574
 575         manager_dispatch_load_queue(m);
 576         return r;
 577 }
 578
 579 int manager_coldplug(Manager *m) {
 580         int r = 0, q;
 581         Iterator i;
 582         Unit *u;
 583         char *k;
 584
 585         assert(m);
 586
 587         /* Then, let's set up their initial state. */
 588         HASHMAP_FOREACH_KEY(u, k, m->units, i) {
 589
 590                 /* ignore aliases */
 591                 if (u->meta.id != k)
 592                         continue;
 593
 594                 if (UNIT_VTABLE(u)->coldplug)
 595                         if ((q = UNIT_VTABLE(u)->coldplug(u)) < 0)
 596                                 r = q;
 597         }
 598
 599         return r;
 600 }
 601
 602 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
 603         int r, q;
 604
 605         assert(m);
 606
 607         /* First, enumerate what we can from all config files */
 608         r = manager_enumerate(m);
 609
 610         /* Second, deserialize if there is something to deserialize */
 611         if (serialization)
 612                 if ((q = manager_deserialize(m, serialization, fds)) < 0)
 613                         r = q;
 614
 615         /* Third, fire things up! */
 616         if ((q = manager_coldplug(m)) < 0)
 617                 r = q;
 618
 619         /* Now that the initial devices are available, let's see if we
 620          * can write the utmp file */
 621         manager_write_utmp_reboot(m);
 622
 623         return r;
 624 }
 625
 626 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
 627         assert(m);
 628         assert(j);
 629
 630         /* Deletes one job from the transaction */
 631
 632         manager_transaction_unlink_job(m, j, delete_dependencies);
 633
 634         if (!j->installed)
 635                 job_free(j);
 636 }
 637
 638 static void transaction_delete_unit(Manager *m, Unit *u) {
 639         Job *j;
 640
 641         /* Deletes all jobs associated with a certain unit from the
 642          * transaction */
 643
 644         while ((j = hashmap_get(m->transaction_jobs, u)))
 645                 transaction_delete_job(m, j, true);
 646 }
 647
 648 static void transaction_clean_dependencies(Manager *m) {
 649         Iterator i;
 650         Job *j;
 651
 652         assert(m);
 653
 654         /* Drops all dependencies of all installed jobs */
 655
 656         HASHMAP_FOREACH(j, m->jobs, i) {
 657                 while (j->subject_list)
 658                         job_dependency_free(j->subject_list);
 659                 while (j->object_list)
 660                         job_dependency_free(j->object_list);
 661         }
 662
 663         assert(!m->transaction_anchor);
 664 }
 665
 666 static void transaction_abort(Manager *m) {
 667         Job *j;
 668
 669         assert(m);
 670
 671         while ((j = hashmap_first(m->transaction_jobs)))
 672                 if (j->installed)
 673                         transaction_delete_job(m, j, true);
 674                 else
 675                         job_free(j);
 676
 677         assert(hashmap_isempty(m->transaction_jobs));
 678
 679         transaction_clean_dependencies(m);
 680 }
 681
 682 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
 683         JobDependency *l;
 684
 685         assert(m);
 686
 687         /* A recursive sweep through the graph that marks all units
 688          * that matter to the anchor job, i.e. are directly or
 689          * indirectly a dependency of the anchor job via paths that
 690          * are fully marked as mattering. */
 691
 692         if (j)
 693                 l = j->subject_list;
 694         else
 695                 l = m->transaction_anchor;
 696
 697         LIST_FOREACH(subject, l, l) {
 698
 699                 /* This link does not matter */
 700                 if (!l->matters)
 701                         continue;
 702
 703                 /* This unit has already been marked */
 704                 if (l->object->generation == generation)
 705                         continue;
 706
 707                 l->object->matters_to_anchor = true;
 708                 l->object->generation = generation;
 709
 710                 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
 711         }
 712 }
 713
 714 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
 715         JobDependency *l, *last;
 716
 717         assert(j);
 718         assert(other);
 719         assert(j->unit == other->unit);
 720         assert(!j->installed);
 721
 722         /* Merges 'other' into 'j' and then deletes j. */
 723
 724         j->type = t;
 725         j->state = JOB_WAITING;
 726         j->override = j->override || other->override;
 727
 728         j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
 729
 730         /* Patch us in as new owner of the JobDependency objects */
 731         last = NULL;
 732         LIST_FOREACH(subject, l, other->subject_list) {
 733                 assert(l->subject == other);
 734                 l->subject = j;
 735                 last = l;
 736         }
 737
 738         /* Merge both lists */
 739         if (last) {
 740                 last->subject_next = j->subject_list;
 741                 if (j->subject_list)
 742                         j->subject_list->subject_prev = last;
 743                 j->subject_list = other->subject_list;
 744         }
 745
 746         /* Patch us in as new owner of the JobDependency objects */
 747         last = NULL;
 748         LIST_FOREACH(object, l, other->object_list) {
 749                 assert(l->object == other);
 750                 l->object = j;
 751                 last = l;
 752         }
 753
 754         /* Merge both lists */
 755         if (last) {
 756                 last->object_next = j->object_list;
 757                 if (j->object_list)
 758                         j->object_list->object_prev = last;
 759                 j->object_list = other->object_list;
 760         }
 761
 762         /* Kill the other job */
 763         other->subject_list = NULL;
 764         other->object_list = NULL;
 765         transaction_delete_job(m, other, true);
 766 }
 767
 768 static int delete_one_unmergeable_job(Manager *m, Job *j) {
 769         Job *k;
 770
 771         assert(j);
 772
 773         /* Tries to delete one item in the linked list
 774          * j->transaction_next->transaction_next->... that conflicts
 775          * whith another one, in an attempt to make an inconsistent
 776          * transaction work. */
 777
 778         /* We rely here on the fact that if a merged with b does not
 779          * merge with c, either a or b merge with c neither */
 780         LIST_FOREACH(transaction, j, j)
 781                 LIST_FOREACH(transaction, k, j->transaction_next) {
 782                         Job *d;
 783
 784                         /* Is this one mergeable? Then skip it */
 785                         if (job_type_is_mergeable(j->type, k->type))
 786                                 continue;
 787
 788                         /* Ok, we found two that conflict, let's see if we can
 789                          * drop one of them */
 790                         if (!j->matters_to_anchor)
 791                                 d = j;
 792                         else if (!k->matters_to_anchor)
 793                                 d = k;
 794                         else
 795                                 return -ENOEXEC;
 796
 797                         /* Ok, we can drop one, so let's do so. */
 798                         log_debug("Trying to fix job merging by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
 799                         transaction_delete_job(m, d, true);
 800                         return 0;
 801                 }
 802
 803         return -EINVAL;
 804 }
 805
 806 static int transaction_merge_jobs(Manager *m) {
 807         Job *j;
 808         Iterator i;
 809         int r;
 810
 811         assert(m);
 812
 813         /* First step, check whether any of the jobs for one specific
 814          * task conflict. If so, try to drop one of them. */
 815         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 816                 JobType t;
 817                 Job *k;
 818
 819                 t = j->type;
 820                 LIST_FOREACH(transaction, k, j->transaction_next) {
 821                         if ((r = job_type_merge(&t, k->type)) >= 0)
 822                                 continue;
 823
 824                         /* OK, we could not merge all jobs for this
 825                          * action. Let's see if we can get rid of one
 826                          * of them */
 827
 828                         if ((r = delete_one_unmergeable_job(m, j)) >= 0)
 829                                 /* Ok, we managed to drop one, now
 830                                  * let's ask our callers to call us
 831                                  * again after garbage collecting */
 832                                 return -EAGAIN;
 833
 834                         /* We couldn't merge anything. Failure */
 835                         return r;
 836                 }
 837         }
 838
 839         /* Second step, merge the jobs. */
 840         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 841                 JobType t = j->type;
 842                 Job *k;
 843
 844                 /* Merge all transactions */
 845                 LIST_FOREACH(transaction, k, j->transaction_next)
 846                         assert_se(job_type_merge(&t, k->type) == 0);
 847
 848                 /* If an active job is mergeable, merge it too */
 849                 if (j->unit->meta.job)
 850                         job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
 851
 852                 while ((k = j->transaction_next)) {
 853                         if (j->installed) {
 854                                 transaction_merge_and_delete_job(m, k, j, t);
 855                                 j = k;
 856                         } else
 857                                 transaction_merge_and_delete_job(m, j, k, t);
 858                 }
 859
 860                 assert(!j->transaction_next);
 861                 assert(!j->transaction_prev);
 862         }
 863
 864         return 0;
 865 }
 866
 867 static void transaction_drop_redundant(Manager *m) {
 868         bool again;
 869
 870         assert(m);
 871
 872         /* Goes through the transaction and removes all jobs that are
 873          * a noop */
 874
 875         do {
 876                 Job *j;
 877                 Iterator i;
 878
 879                 again = false;
 880
 881                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 882                         bool changes_something = false;
 883                         Job *k;
 884
 885                         LIST_FOREACH(transaction, k, j) {
 886
 887                                 if (!job_is_anchor(k) &&
 888                                     job_type_is_redundant(k->type, unit_active_state(k->unit)))
 889                                         continue;
 890
 891                                 changes_something = true;
 892                                 break;
 893                         }
 894
 895                         if (changes_something)
 896                                 continue;
 897
 898                         log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type));
 899                         transaction_delete_job(m, j, false);
 900                         again = true;
 901                         break;
 902                 }
 903
 904         } while (again);
 905 }
 906
 907 static bool unit_matters_to_anchor(Unit *u, Job *j) {
 908         assert(u);
 909         assert(!j->transaction_prev);
 910
 911         /* Checks whether at least one of the jobs for this unit
 912          * matters to the anchor. */
 913
 914         LIST_FOREACH(transaction, j, j)
 915                 if (j->matters_to_anchor)
 916                         return true;
 917
 918         return false;
 919 }
 920
 921 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation) {
 922         Iterator i;
 923         Unit *u;
 924         int r;
 925
 926         assert(m);
 927         assert(j);
 928         assert(!j->transaction_prev);
 929
 930         /* Does a recursive sweep through the ordering graph, looking
 931          * for a cycle. If we find cycle we try to break it. */
 932
 933         /* Did we find a cycle? */
 934         if (j->marker && j->generation == generation) {
 935                 Job *k;
 936
 937                 /* So, we already have been here. We have a
 938                  * cycle. Let's try to break it. We go backwards in
 939                  * our path and try to find a suitable job to
 940                  * remove. We use the marker to find our way back,
 941                  * since smart how we are we stored our way back in
 942                  * there. */
 943
 944                 log_debug("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
 945
 946                 for (k = from; k; k = (k->generation == generation ? k->marker : NULL)) {
 947
 948                         log_debug("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
 949
 950                         if (!k->installed &&
 951                             !unit_matters_to_anchor(k->unit, k)) {
 952                                 /* Ok, we can drop this one, so let's
 953                                  * do so. */
 954                                 log_debug("Breaking order cycle by deleting job %s/%s", k->unit->meta.id, job_type_to_string(k->type));
 955                                 transaction_delete_unit(m, k->unit);
 956                                 return -EAGAIN;
 957                         }
 958
 959                         /* Check if this in fact was the beginning of
 960                          * the cycle */
 961                         if (k == j)
 962                                 break;
 963                 }
 964
 965                 log_debug("Unable to break cycle");
 966
 967                 return -ENOEXEC;
 968         }
 969
 970         /* Make the marker point to where we come from, so that we can
 971          * find our way backwards if we want to break a cycle */
 972         j->marker = from;
 973         j->generation = generation;
 974
 975         /* We assume that the the dependencies are bidirectional, and
 976          * hence can ignore UNIT_AFTER */
 977         SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
 978                 Job *o;
 979
 980                 /* Is there a job for this unit? */
 981                 if (!(o = hashmap_get(m->transaction_jobs, u)))
 982
 983                         /* Ok, there is no job for this in the
 984                          * transaction, but maybe there is already one
 985                          * running? */
 986                         if (!(o = u->meta.job))
 987                                 continue;
 988
 989                 if ((r = transaction_verify_order_one(m, o, j, generation)) < 0)
 990                         return r;
 991         }
 992
 993         /* Ok, let's backtrack, and remember that this entry is not on
 994          * our path anymore. */
 995         j->marker = NULL;
 996
 997         return 0;
 998 }
 999
1000 static int transaction_verify_order(Manager *m, unsigned *generation) {
1001         Job *j;
1002         int r;
1003         Iterator i;
1004
1005         assert(m);
1006         assert(generation);
1007
1008         /* Check if the ordering graph is cyclic. If it is, try to fix
1009          * that up by dropping one of the jobs. */
1010
1011         HASHMAP_FOREACH(j, m->transaction_jobs, i)
1012                 if ((r = transaction_verify_order_one(m, j, NULL, (*generation)++)) < 0)
1013                         return r;
1014
1015         return 0;
1016 }
1017
1018 static void transaction_collect_garbage(Manager *m) {
1019         bool again;
1020
1021         assert(m);
1022
1023         /* Drop jobs that are not required by any other job */
1024
1025         do {
1026                 Iterator i;
1027                 Job *j;
1028
1029                 again = false;
1030
1031                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1032                         if (j->object_list)
1033                                 continue;
1034
1035                         log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type));
1036                         transaction_delete_job(m, j, true);
1037                         again = true;
1038                         break;
1039                 }
1040
1041         } while (again);
1042 }
1043
1044 static int transaction_is_destructive(Manager *m) {
1045         Iterator i;
1046         Job *j;
1047
1048         assert(m);
1049
1050         /* Checks whether applying this transaction means that
1051          * existing jobs would be replaced */
1052
1053         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1054
1055                 /* Assume merged */
1056                 assert(!j->transaction_prev);
1057                 assert(!j->transaction_next);
1058
1059                 if (j->unit->meta.job &&
1060                     j->unit->meta.job != j &&
1061                     !job_type_is_superset(j->type, j->unit->meta.job->type))
1062                         return -EEXIST;
1063         }
1064
1065         return 0;
1066 }
1067
1068 static void transaction_minimize_impact(Manager *m) {
1069         bool again;
1070         assert(m);
1071
1072         /* Drops all unnecessary jobs that reverse already active jobs
1073          * or that stop a running service. */
1074
1075         do {
1076                 Job *j;
1077                 Iterator i;
1078
1079                 again = false;
1080
1081                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1082                         LIST_FOREACH(transaction, j, j) {
1083                                 bool stops_running_service, changes_existing_job;
1084
1085                                 /* If it matters, we shouldn't drop it */
1086                                 if (j->matters_to_anchor)
1087                                         continue;
1088
1089                                 /* Would this stop a running service?
1090                                  * Would this change an existing job?
1091                                  * If so, let's drop this entry */
1092
1093                                 stops_running_service =
1094                                         j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1095
1096                                 changes_existing_job =
1097                                         j->unit->meta.job && job_type_is_conflicting(j->type, j->unit->meta.job->state);
1098
1099                                 if (!stops_running_service && !changes_existing_job)
1100                                         continue;
1101
1102                                 if (stops_running_service)
1103                                         log_debug("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1104
1105                                 if (changes_existing_job)
1106                                         log_debug("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1107
1108                                 /* Ok, let's get rid of this */
1109                                 log_debug("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1110
1111                                 transaction_delete_job(m, j, true);
1112                                 again = true;
1113                                 break;
1114                         }
1115
1116                         if (again)
1117                                 break;
1118                 }
1119
1120         } while (again);
1121 }
1122
1123 static int transaction_apply(Manager *m) {
1124         Iterator i;
1125         Job *j;
1126         int r;
1127
1128         /* Moves the transaction jobs to the set of active jobs */
1129
1130         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1131                 /* Assume merged */
1132                 assert(!j->transaction_prev);
1133                 assert(!j->transaction_next);
1134
1135                 if (j->installed)
1136                         continue;
1137
1138                 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1139                         goto rollback;
1140         }
1141
1142         while ((j = hashmap_steal_first(m->transaction_jobs))) {
1143                 if (j->installed)
1144                         continue;
1145
1146                 if (j->unit->meta.job)
1147                         job_free(j->unit->meta.job);
1148
1149                 j->unit->meta.job = j;
1150                 j->installed = true;
1151
1152                 /* We're fully installed. Now let's free data we don't
1153                  * need anymore. */
1154
1155                 assert(!j->transaction_next);
1156                 assert(!j->transaction_prev);
1157
1158                 job_add_to_run_queue(j);
1159                 job_add_to_dbus_queue(j);
1160         }
1161
1162         /* As last step, kill all remaining job dependencies. */
1163         transaction_clean_dependencies(m);
1164
1165         return 0;
1166
1167 rollback:
1168
1169         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1170                 if (j->installed)
1171                         continue;
1172
1173                 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1174         }
1175
1176         return r;
1177 }
1178
1179 static int transaction_activate(Manager *m, JobMode mode) {
1180         int r;
1181         unsigned generation = 1;
1182
1183         assert(m);
1184
1185         /* This applies the changes recorded in transaction_jobs to
1186          * the actual list of jobs, if possible. */
1187
1188         /* First step: figure out which jobs matter */
1189         transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1190
1191         /* Second step: Try not to stop any running services if
1192          * we don't have to. Don't try to reverse running
1193          * jobs if we don't have to. */
1194         transaction_minimize_impact(m);
1195
1196         /* Third step: Drop redundant jobs */
1197         transaction_drop_redundant(m);
1198
1199         for (;;) {
1200                 /* Fourth step: Let's remove unneeded jobs that might
1201                  * be lurking. */
1202                 transaction_collect_garbage(m);
1203
1204                 /* Fifth step: verify order makes sense and correct
1205                  * cycles if necessary and possible */
1206                 if ((r = transaction_verify_order(m, &generation)) >= 0)
1207                         break;
1208
1209                 if (r != -EAGAIN) {
1210                         log_debug("Requested transaction contains an unfixable cyclic ordering dependency: %s", strerror(-r));
1211                         goto rollback;
1212                 }
1213
1214                 /* Let's see if the resulting transaction ordering
1215                  * graph is still cyclic... */
1216         }
1217
1218         for (;;) {
1219                 /* Sixth step: let's drop unmergeable entries if
1220                  * necessary and possible, merge entries we can
1221                  * merge */
1222                 if ((r = transaction_merge_jobs(m)) >= 0)
1223                         break;
1224
1225                 if (r != -EAGAIN) {
1226                         log_debug("Requested transaction contains unmergable jobs: %s", strerror(-r));
1227                         goto rollback;
1228                 }
1229
1230                 /* Seventh step: an entry got dropped, let's garbage
1231                  * collect its dependencies. */
1232                 transaction_collect_garbage(m);
1233
1234                 /* Let's see if the resulting transaction still has
1235                  * unmergeable entries ... */
1236         }
1237
1238         /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1239         transaction_drop_redundant(m);
1240
1241         /* Ninth step: check whether we can actually apply this */
1242         if (mode == JOB_FAIL)
1243                 if ((r = transaction_is_destructive(m)) < 0) {
1244                         log_debug("Requested transaction contradicts existing jobs: %s", strerror(-r));
1245                         goto rollback;
1246                 }
1247
1248         /* Tenth step: apply changes */
1249         if ((r = transaction_apply(m)) < 0) {
1250                 log_debug("Failed to apply transaction: %s", strerror(-r));
1251                 goto rollback;
1252         }
1253
1254         assert(hashmap_isempty(m->transaction_jobs));
1255         assert(!m->transaction_anchor);
1256
1257         return 0;
1258
1259 rollback:
1260         transaction_abort(m);
1261         return r;
1262 }
1263
1264 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1265         Job *j, *f;
1266         int r;
1267
1268         assert(m);
1269         assert(unit);
1270
1271         /* Looks for an axisting prospective job and returns that. If
1272          * it doesn't exist it is created and added to the prospective
1273          * jobs list. */
1274
1275         f = hashmap_get(m->transaction_jobs, unit);
1276
1277         LIST_FOREACH(transaction, j, f) {
1278                 assert(j->unit == unit);
1279
1280                 if (j->type == type) {
1281                         if (is_new)
1282                                 *is_new = false;
1283                         return j;
1284                 }
1285         }
1286
1287         if (unit->meta.job && unit->meta.job->type == type)
1288                 j = unit->meta.job;
1289         else if (!(j = job_new(m, type, unit)))
1290                 return NULL;
1291
1292         j->generation = 0;
1293         j->marker = NULL;
1294         j->matters_to_anchor = false;
1295         j->override = override;
1296
1297         LIST_PREPEND(Job, transaction, f, j);
1298
1299         if ((r = hashmap_replace(m->transaction_jobs, unit, f)) < 0) {
1300                 job_free(j);
1301                 return NULL;
1302         }
1303
1304         if (is_new)
1305                 *is_new = true;
1306
1307         log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type));
1308
1309         return j;
1310 }
1311
1312 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1313         assert(m);
1314         assert(j);
1315
1316         if (j->transaction_prev)
1317                 j->transaction_prev->transaction_next = j->transaction_next;
1318         else if (j->transaction_next)
1319                 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1320         else
1321                 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1322
1323         if (j->transaction_next)
1324                 j->transaction_next->transaction_prev = j->transaction_prev;
1325
1326         j->transaction_prev = j->transaction_next = NULL;
1327
1328         while (j->subject_list)
1329                 job_dependency_free(j->subject_list);
1330
1331         while (j->object_list) {
1332                 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1333
1334                 job_dependency_free(j->object_list);
1335
1336                 if (other && delete_dependencies) {
1337                         log_debug("Deleting job %s/%s as dependency of job %s/%s",
1338                                   other->unit->meta.id, job_type_to_string(other->type),
1339                                   j->unit->meta.id, job_type_to_string(j->type));
1340                         transaction_delete_job(m, other, delete_dependencies);
1341                 }
1342         }
1343 }
1344
1345 static int transaction_add_job_and_dependencies(
1346                 Manager *m,
1347                 JobType type,
1348                 Unit *unit,
1349                 Job *by,
1350                 bool matters,
1351                 bool override,
1352                 Job **_ret) {
1353         Job *ret;
1354         Iterator i;
1355         Unit *dep;
1356         int r;
1357         bool is_new;
1358
1359         assert(m);
1360         assert(type < _JOB_TYPE_MAX);
1361         assert(unit);
1362
1363         if (unit->meta.load_state != UNIT_LOADED)
1364                 return -EINVAL;
1365
1366         if (!unit_job_is_applicable(unit, type))
1367                 return -EBADR;
1368
1369         /* First add the job. */
1370         if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1371                 return -ENOMEM;
1372
1373         /* Then, add a link to the job. */
1374         if (!job_dependency_new(by, ret, matters))
1375                 return -ENOMEM;
1376
1377         if (is_new) {
1378                 /* Finally, recursively add in all dependencies. */
1379                 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1380                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1381                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1382                                         goto fail;
1383
1384                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1385                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, NULL)) < 0 && r != -EBADR)
1386                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1387
1388                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1389                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, NULL)) < 0)
1390                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1391
1392                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1393                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1394                                         goto fail;
1395
1396                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1397                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, NULL)) < 0 && r != -EBADR)
1398                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
1399
1400                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1401                                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1402                                         goto fail;
1403
1404                 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1405
1406                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1407                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
1408                                         goto fail;
1409                 }
1410
1411                 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1412         }
1413
1414         if (_ret)
1415                 *_ret = ret;
1416
1417         return 0;
1418
1419 fail:
1420         return r;
1421 }
1422
1423 static int transaction_add_isolate_jobs(Manager *m) {
1424         Iterator i;
1425         Unit *u;
1426         char *k;
1427         int r;
1428
1429         assert(m);
1430
1431         HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1432
1433                 /* ignore aliases */
1434                 if (u->meta.id != k)
1435                         continue;
1436
1437                 if (UNIT_VTABLE(u)->no_isolate)
1438                         continue;
1439
1440                 /* No need to stop inactive jobs */
1441                 if (unit_active_state(u) == UNIT_INACTIVE)
1442                         continue;
1443
1444                 /* Is there already something listed for this? */
1445                 if (hashmap_get(m->transaction_jobs, u))
1446                         continue;
1447
1448                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, NULL)) < 0)
1449                         log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1450         }
1451
1452         return 0;
1453 }
1454
1455 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, Job **_ret) {
1456         int r;
1457         Job *ret;
1458
1459         assert(m);
1460         assert(type < _JOB_TYPE_MAX);
1461         assert(unit);
1462         assert(mode < _JOB_MODE_MAX);
1463
1464         if (mode == JOB_ISOLATE && type != JOB_START)
1465                 return -EINVAL;
1466
1467         log_debug("Trying to enqueue job %s/%s", unit->meta.id, job_type_to_string(type));
1468
1469         if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, &ret)) < 0) {
1470                 transaction_abort(m);
1471                 return r;
1472         }
1473
1474         if (mode == JOB_ISOLATE)
1475                 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1476                         transaction_abort(m);
1477                         return r;
1478                 }
1479
1480         if ((r = transaction_activate(m, mode)) < 0)
1481                 return r;
1482
1483         log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1484
1485         if (_ret)
1486                 *_ret = ret;
1487
1488         return 0;
1489 }
1490
1491 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, Job **_ret) {
1492         Unit *unit;
1493         int r;
1494
1495         assert(m);
1496         assert(type < _JOB_TYPE_MAX);
1497         assert(name);
1498         assert(mode < _JOB_MODE_MAX);
1499
1500         if ((r = manager_load_unit(m, name, NULL, &unit)) < 0)
1501                 return r;
1502
1503         return manager_add_job(m, type, unit, mode, override, _ret);
1504 }
1505
1506 Job *manager_get_job(Manager *m, uint32_t id) {
1507         assert(m);
1508
1509         return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1510 }
1511
1512 Unit *manager_get_unit(Manager *m, const char *name) {
1513         assert(m);
1514         assert(name);
1515
1516         return hashmap_get(m->units, name);
1517 }
1518
1519 unsigned manager_dispatch_load_queue(Manager *m) {
1520         Meta *meta;
1521         unsigned n = 0;
1522
1523         assert(m);
1524
1525         /* Make sure we are not run recursively */
1526         if (m->dispatching_load_queue)
1527                 return 0;
1528
1529         m->dispatching_load_queue = true;
1530
1531         /* Dispatches the load queue. Takes a unit from the queue and
1532          * tries to load its data until the queue is empty */
1533
1534         while ((meta = m->load_queue)) {
1535                 assert(meta->in_load_queue);
1536
1537                 unit_load(UNIT(meta));
1538                 n++;
1539         }
1540
1541         m->dispatching_load_queue = false;
1542         return n;
1543 }
1544
1545 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, Unit **_ret) {
1546         Unit *ret;
1547         int r;
1548
1549         assert(m);
1550         assert(name || path);
1551
1552         /* This will prepare the unit for loading, but not actually
1553          * load anything from disk. */
1554
1555         if (path && !is_path(path))
1556                 return -EINVAL;
1557
1558         if (!name)
1559                 name = file_name_from_path(path);
1560
1561         if (!unit_name_is_valid(name))
1562                 return -EINVAL;
1563
1564         if ((ret = manager_get_unit(m, name))) {
1565                 *_ret = ret;
1566                 return 1;
1567         }
1568
1569         if (!(ret = unit_new(m)))
1570                 return -ENOMEM;
1571
1572         if (path)
1573                 if (!(ret->meta.fragment_path = strdup(path))) {
1574                         unit_free(ret);
1575                         return -ENOMEM;
1576                 }
1577
1578         if ((r = unit_add_name(ret, name)) < 0) {
1579                 unit_free(ret);
1580                 return r;
1581         }
1582
1583         unit_add_to_load_queue(ret);
1584         unit_add_to_dbus_queue(ret);
1585         unit_add_to_gc_queue(ret);
1586
1587         if (_ret)
1588                 *_ret = ret;
1589
1590         return 0;
1591 }
1592
1593 int manager_load_unit(Manager *m, const char *name, const char *path, Unit **_ret) {
1594         int r;
1595
1596         assert(m);
1597
1598         /* This will load the service information files, but not actually
1599          * start any services or anything. */
1600
1601         if ((r = manager_load_unit_prepare(m, name, path, _ret)) != 0)
1602                 return r;
1603
1604         manager_dispatch_load_queue(m);
1605
1606         if (_ret)
1607                 *_ret = unit_follow_merge(*_ret);
1608
1609         return 0;
1610 }
1611
1612 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1613         Iterator i;
1614         Job *j;
1615
1616         assert(s);
1617         assert(f);
1618
1619         HASHMAP_FOREACH(j, s->jobs, i)
1620                 job_dump(j, f, prefix);
1621 }
1622
1623 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1624         Iterator i;
1625         Unit *u;
1626         const char *t;
1627
1628         assert(s);
1629         assert(f);
1630
1631         HASHMAP_FOREACH_KEY(u, t, s->units, i)
1632                 if (u->meta.id == t)
1633                         unit_dump(u, f, prefix);
1634 }
1635
1636 void manager_clear_jobs(Manager *m) {
1637         Job *j;
1638
1639         assert(m);
1640
1641         transaction_abort(m);
1642
1643         while ((j = hashmap_first(m->jobs)))
1644                 job_free(j);
1645 }
1646
1647 unsigned manager_dispatch_run_queue(Manager *m) {
1648         Job *j;
1649         unsigned n = 0;
1650
1651         if (m->dispatching_run_queue)
1652                 return 0;
1653
1654         m->dispatching_run_queue = true;
1655
1656         while ((j = m->run_queue)) {
1657                 assert(j->installed);
1658                 assert(j->in_run_queue);
1659
1660                 job_run_and_invalidate(j);
1661                 n++;
1662         }
1663
1664         m->dispatching_run_queue = false;
1665         return n;
1666 }
1667
1668 unsigned manager_dispatch_dbus_queue(Manager *m) {
1669         Job *j;
1670         Meta *meta;
1671         unsigned n = 0;
1672
1673         assert(m);
1674
1675         if (m->dispatching_dbus_queue)
1676                 return 0;
1677
1678         m->dispatching_dbus_queue = true;
1679
1680         while ((meta = m->dbus_unit_queue)) {
1681                 assert(meta->in_dbus_queue);
1682
1683                 bus_unit_send_change_signal(UNIT(meta));
1684                 n++;
1685         }
1686
1687         while ((j = m->dbus_job_queue)) {
1688                 assert(j->in_dbus_queue);
1689
1690                 bus_job_send_change_signal(j);
1691                 n++;
1692         }
1693
1694         m->dispatching_dbus_queue = false;
1695         return n;
1696 }
1697
1698 static int manager_dispatch_sigchld(Manager *m) {
1699         assert(m);
1700
1701         for (;;) {
1702                 siginfo_t si;
1703                 Unit *u;
1704
1705                 zero(si);
1706
1707                 /* First we call waitd() for a PID and do not reap the
1708                  * zombie. That way we can still access /proc/$PID for
1709                  * it while it is a zombie. */
1710                 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1711
1712                         if (errno == ECHILD)
1713                                 break;
1714
1715                         if (errno == EINTR)
1716                                 continue;
1717
1718                         return -errno;
1719                 }
1720
1721                 if (si.si_pid <= 0)
1722                         break;
1723
1724                 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
1725                         char *name = NULL;
1726
1727                         get_process_name(si.si_pid, &name);
1728                         log_debug("Got SIGCHLD for process %llu (%s)", (unsigned long long) si.si_pid, strna(name));
1729                         free(name);
1730                 }
1731
1732                 /* And now, we actually reap the zombie. */
1733                 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
1734                         if (errno == EINTR)
1735                                 continue;
1736
1737                         return -errno;
1738                 }
1739
1740                 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
1741                         continue;
1742
1743                 log_debug("Child %llu died (code=%s, status=%i/%s)",
1744                           (long long unsigned) si.si_pid,
1745                           sigchld_code_to_string(si.si_code),
1746                           si.si_status,
1747                           strna(si.si_code == CLD_EXITED ? exit_status_to_string(si.si_status) : strsignal(si.si_status)));
1748
1749                 if (!(u = hashmap_remove(m->watch_pids, UINT32_TO_PTR(si.si_pid))))
1750                         continue;
1751
1752                 log_debug("Child %llu belongs to %s", (long long unsigned) si.si_pid, u->meta.id);
1753
1754                 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
1755         }
1756
1757         return 0;
1758 }
1759
1760 static void manager_start_target(Manager *m, const char *name) {
1761         int r;
1762
1763         if ((r = manager_add_job_by_name(m, JOB_START, name, JOB_REPLACE, true, NULL)) < 0)
1764                 log_error("Failed to enqueue %s job: %s", name, strerror(-r));
1765 }
1766
1767 static int manager_process_signal_fd(Manager *m) {
1768         ssize_t n;
1769         struct signalfd_siginfo sfsi;
1770         bool sigchld = false;
1771
1772         assert(m);
1773
1774         for (;;) {
1775                 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
1776
1777                         if (n >= 0)
1778                                 return -EIO;
1779
1780                         if (errno == EAGAIN)
1781                                 break;
1782
1783                         return -errno;
1784                 }
1785
1786                 switch (sfsi.ssi_signo) {
1787
1788                 case SIGCHLD:
1789                         sigchld = true;
1790                         break;
1791
1792                 case SIGTERM:
1793                         if (m->running_as == MANAGER_INIT)
1794                                 /* This is for compatibility with the
1795                                  * original sysvinit */
1796                                 m->exit_code = MANAGER_REEXECUTE;
1797                         else
1798                                 m->exit_code = MANAGER_EXIT;
1799
1800                         return 0;
1801
1802                 case SIGINT:
1803                         if (m->running_as == MANAGER_INIT) {
1804                                 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET);
1805                                 break;
1806                         }
1807
1808                         m->exit_code = MANAGER_EXIT;
1809                         return 0;
1810
1811                 case SIGWINCH:
1812                         if (m->running_as == MANAGER_INIT)
1813                                 manager_start_target(m, SPECIAL_KBREQUEST_TARGET);
1814
1815                         /* This is a nop on non-init */
1816                         break;
1817
1818                 case SIGPWR:
1819                         if (m->running_as == MANAGER_INIT)
1820                                 manager_start_target(m, SPECIAL_SIGPWR_TARGET);
1821
1822                         /* This is a nop on non-init */
1823                         break;
1824
1825                 case SIGUSR1: {
1826                         Unit *u;
1827
1828                         u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
1829
1830                         if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
1831                                 log_info("Trying to reconnect to bus...");
1832                                 bus_init_system(m);
1833                                 bus_init_api(m);
1834                         }
1835
1836                         if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
1837                                 log_info("Loading D-Bus service...");
1838                                 manager_start_target(m, SPECIAL_DBUS_SERVICE);
1839                         }
1840
1841                         break;
1842                 }
1843
1844                 case SIGUSR2:
1845                         manager_dump_units(m, stdout, "\t");
1846                         manager_dump_jobs(m, stdout, "\t");
1847                         break;
1848
1849                 case SIGHUP:
1850                         m->exit_code = MANAGER_RELOAD;
1851                         break;
1852
1853                 default:
1854                         log_info("Got unhandled signal <%s>.", strsignal(sfsi.ssi_signo));
1855                 }
1856         }
1857
1858         if (sigchld)
1859                 return manager_dispatch_sigchld(m);
1860
1861         return 0;
1862 }
1863
1864 static int process_event(Manager *m, struct epoll_event *ev) {
1865         int r;
1866         Watch *w;
1867
1868         assert(m);
1869         assert(ev);
1870
1871         assert(w = ev->data.ptr);
1872
1873         switch (w->type) {
1874
1875         case WATCH_SIGNAL:
1876
1877                 /* An incoming signal? */
1878                 if (ev->events != EPOLLIN)
1879                         return -EINVAL;
1880
1881                 if ((r = manager_process_signal_fd(m)) < 0)
1882                         return r;
1883
1884                 break;
1885
1886         case WATCH_FD:
1887
1888                 /* Some fd event, to be dispatched to the units */
1889                 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
1890                 break;
1891
1892         case WATCH_TIMER: {
1893                 uint64_t v;
1894                 ssize_t k;
1895
1896                 /* Some timer event, to be dispatched to the units */
1897                 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
1898
1899                         if (k < 0 && (errno == EINTR || errno == EAGAIN))
1900                                 break;
1901
1902                         return k < 0 ? -errno : -EIO;
1903                 }
1904
1905                 UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
1906                 break;
1907         }
1908
1909         case WATCH_MOUNT:
1910                 /* Some mount table change, intended for the mount subsystem */
1911                 mount_fd_event(m, ev->events);
1912                 break;
1913
1914         case WATCH_UDEV:
1915                 /* Some notification from udev, intended for the device subsystem */
1916                 device_fd_event(m, ev->events);
1917                 break;
1918
1919         case WATCH_DBUS_WATCH:
1920                 bus_watch_event(m, w, ev->events);
1921                 break;
1922
1923         case WATCH_DBUS_TIMEOUT:
1924                 bus_timeout_event(m, w, ev->events);
1925                 break;
1926
1927         default:
1928                 assert_not_reached("Unknown epoll event type.");
1929         }
1930
1931         return 0;
1932 }
1933
1934 int manager_loop(Manager *m) {
1935         int r;
1936
1937         RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
1938
1939         assert(m);
1940         m->exit_code = MANAGER_RUNNING;
1941
1942         /* There might still be some zombies hanging around from
1943          * before we were exec()'ed. Leat's reap them */
1944         if ((r = manager_dispatch_sigchld(m)) < 0)
1945                 return r;
1946
1947         while (m->exit_code == MANAGER_RUNNING) {
1948                 struct epoll_event event;
1949                 int n;
1950
1951                 if (!ratelimit_test(&rl)) {
1952                         /* Yay, something is going seriously wrong, pause a little */
1953                         log_warning("Looping too fast. Throttling execution a little.");
1954                         sleep(1);
1955                 }
1956
1957                 if (manager_dispatch_load_queue(m) > 0)
1958                         continue;
1959
1960                 if (manager_dispatch_run_queue(m) > 0)
1961                         continue;
1962
1963                 if (bus_dispatch(m) > 0)
1964                         continue;
1965
1966                 if (manager_dispatch_cleanup_queue(m) > 0)
1967                         continue;
1968
1969                 if (manager_dispatch_gc_queue(m) > 0)
1970                         continue;
1971
1972                 if (manager_dispatch_dbus_queue(m) > 0)
1973                         continue;
1974
1975                 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
1976
1977                         if (errno == EINTR)
1978                                 continue;
1979
1980                         return -errno;
1981                 }
1982
1983                 assert(n == 1);
1984
1985                 if ((r = process_event(m, &event)) < 0)
1986                         return r;
1987         }
1988
1989         return m->exit_code;
1990 }
1991
1992 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
1993         char *n;
1994         Unit *u;
1995
1996         assert(m);
1997         assert(s);
1998         assert(_u);
1999
2000         if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2001                 return -EINVAL;
2002
2003         if (!(n = bus_path_unescape(s+31)))
2004                 return -ENOMEM;
2005
2006         u = manager_get_unit(m, n);
2007         free(n);
2008
2009         if (!u)
2010                 return -ENOENT;
2011
2012         *_u = u;
2013
2014         return 0;
2015 }
2016
2017 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2018         Job *j;
2019         unsigned id;
2020         int r;
2021
2022         assert(m);
2023         assert(s);
2024         assert(_j);
2025
2026         if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2027                 return -EINVAL;
2028
2029         if ((r = safe_atou(s + 30, &id)) < 0)
2030                 return r;
2031
2032         if (!(j = manager_get_job(m, id)))
2033                 return -ENOENT;
2034
2035         *_j = j;
2036
2037         return 0;
2038 }
2039
2040 static bool manager_utmp_good(Manager *m) {
2041         int r;
2042
2043         assert(m);
2044
2045         if ((r = mount_path_is_mounted(m, _PATH_UTMPX)) <= 0) {
2046
2047                 if (r < 0)
2048                         log_warning("Failed to determine whether " _PATH_UTMPX " is mounted: %s", strerror(-r));
2049
2050                 return false;
2051         }
2052
2053         return true;
2054 }
2055
2056 void manager_write_utmp_reboot(Manager *m) {
2057         int r;
2058
2059         assert(m);
2060
2061         if (m->utmp_reboot_written)
2062                 return;
2063
2064         if (m->running_as != MANAGER_INIT)
2065                 return;
2066
2067         if (!manager_utmp_good(m))
2068                 return;
2069
2070         if ((r = utmp_put_reboot(m->boot_timestamp)) < 0) {
2071
2072                 if (r != -ENOENT && r != -EROFS)
2073                         log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
2074
2075                 return;
2076         }
2077
2078         m->utmp_reboot_written = true;
2079 }
2080
2081 void manager_write_utmp_runlevel(Manager *m, Unit *u) {
2082         int runlevel, r;
2083
2084         assert(m);
2085         assert(u);
2086
2087         if (u->meta.type != UNIT_TARGET)
2088                 return;
2089
2090         if (m->running_as != MANAGER_INIT)
2091                 return;
2092
2093         if (!manager_utmp_good(m))
2094                 return;
2095
2096         if ((runlevel = target_get_runlevel(TARGET(u))) <= 0)
2097                 return;
2098
2099         if ((r = utmp_put_runlevel(0, runlevel, 0)) < 0) {
2100
2101                 if (r != -ENOENT && r != -EROFS)
2102                         log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
2103         }
2104 }
2105
2106 void manager_dispatch_bus_name_owner_changed(
2107                 Manager *m,
2108                 const char *name,
2109                 const char* old_owner,
2110                 const char *new_owner) {
2111
2112         Unit *u;
2113
2114         assert(m);
2115         assert(name);
2116
2117         if (!(u = hashmap_get(m->watch_bus, name)))
2118                 return;
2119
2120         UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2121 }
2122
2123 void manager_dispatch_bus_query_pid_done(
2124                 Manager *m,
2125                 const char *name,
2126                 pid_t pid) {
2127
2128         Unit *u;
2129
2130         assert(m);
2131         assert(name);
2132         assert(pid >= 1);
2133
2134         if (!(u = hashmap_get(m->watch_bus, name)))
2135                 return;
2136
2137         UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2138 }
2139
2140 int manager_open_serialization(FILE **_f) {
2141         char *path;
2142         mode_t saved_umask;
2143         int fd;
2144         FILE *f;
2145
2146         assert(_f);
2147
2148         if (asprintf(&path, "/dev/shm/systemd-%u.dump-XXXXXX", (unsigned) getpid()) < 0)
2149                 return -ENOMEM;
2150
2151         saved_umask = umask(0077);
2152         fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2153         umask(saved_umask);
2154
2155         if (fd < 0) {
2156                 free(path);
2157                 return -errno;
2158         }
2159
2160         unlink(path);
2161
2162         log_debug("Serializing state to %s", path);
2163         free(path);
2164
2165         if (!(f = fdopen(fd, "w+")) < 0)
2166                 return -errno;
2167
2168         *_f = f;
2169
2170         return 0;
2171 }
2172
2173 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2174         Iterator i;
2175         Unit *u;
2176         const char *t;
2177         int r;
2178
2179         assert(m);
2180         assert(f);
2181         assert(fds);
2182
2183         HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2184                 if (u->meta.id != t)
2185                         continue;
2186
2187                 if (!unit_can_serialize(u))
2188                         continue;
2189
2190                 /* Start marker */
2191                 fputs(u->meta.id, f);
2192                 fputc('\n', f);
2193
2194                 if ((r = unit_serialize(u, f, fds)) < 0)
2195                         return r;
2196         }
2197
2198         if (ferror(f))
2199                 return -EIO;
2200
2201         return 0;
2202 }
2203
2204 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2205         int r = 0;
2206
2207         assert(m);
2208         assert(f);
2209
2210         log_debug("Deserializing state...");
2211
2212         for (;;) {
2213                 Unit *u;
2214                 char name[UNIT_NAME_MAX+2];
2215
2216                 /* Start marker */
2217                 if (!fgets(name, sizeof(name), f)) {
2218                         if (feof(f))
2219                                 break;
2220
2221                         return -errno;
2222                 }
2223
2224                 char_array_0(name);
2225
2226                 if ((r = manager_load_unit(m, strstrip(name), NULL, &u)) < 0)
2227                         return r;
2228
2229                 if ((r = unit_deserialize(u, f, fds)) < 0)
2230                         return r;
2231         }
2232
2233         if (ferror(f))
2234                 return -EIO;
2235
2236         return 0;
2237 }
2238
2239 int manager_reload(Manager *m) {
2240         int r, q;
2241         FILE *f;
2242         FDSet *fds;
2243
2244         assert(m);
2245
2246         if ((r = manager_open_serialization(&f)) < 0)
2247                 return r;
2248
2249         if (!(fds = fdset_new())) {
2250                 r = -ENOMEM;
2251                 goto finish;
2252         }
2253
2254         if ((r = manager_serialize(m, f, fds)) < 0)
2255                 goto finish;
2256
2257         if (fseeko(f, 0, SEEK_SET) < 0) {
2258                 r = -errno;
2259                 goto finish;
2260         }
2261
2262         /* From here on there is no way back. */
2263         manager_clear_jobs_and_units(m);
2264
2265         /* First, enumerate what we can from all config files */
2266         if ((q = manager_enumerate(m)) < 0)
2267                 r = q;
2268
2269         /* Second, deserialize our stored data */
2270         if ((q = manager_deserialize(m, f, fds)) < 0)
2271                 r = q;
2272
2273         fclose(f);
2274         f = NULL;
2275
2276         /* Third, fire things up! */
2277         if ((q = manager_coldplug(m)) < 0)
2278                 r = q;
2279
2280 finish:
2281         if (f)
2282                 fclose(f);
2283
2284         if (fds)
2285                 fdset_free(fds);
2286
2287         return r;
2288 }
2289
2290 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
2291         [MANAGER_INIT] = "init",
2292         [MANAGER_SYSTEM] = "system",
2293         [MANAGER_SESSION] = "session"
2294 };
2295
2296 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);