src/manager.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU 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 <sys/poll.h>
  31 #include <sys/reboot.h>
  32 #include <sys/ioctl.h>
  33 #include <linux/kd.h>
  34 #include <termios.h>
  35 #include <fcntl.h>
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 #include <dirent.h>
  39
  40 #ifdef HAVE_AUDIT
  41 #include <libaudit.h>
  42 #endif
  43
  44 #include "manager.h"
  45 #include "hashmap.h"
  46 #include "macro.h"
  47 #include "strv.h"
  48 #include "log.h"
  49 #include "util.h"
  50 #include "ratelimit.h"
  51 #include "cgroup.h"
  52 #include "mount-setup.h"
  53 #include "unit-name.h"
  54 #include "dbus-unit.h"
  55 #include "dbus-job.h"
  56 #include "missing.h"
  57 #include "path-lookup.h"
  58 #include "special.h"
  59 #include "bus-errors.h"
  60 #include "exit-status.h"
  61
  62 /* As soon as 16 units are in our GC queue, make sure to run a gc sweep */
  63 #define GC_QUEUE_ENTRIES_MAX 16
  64
  65 /* As soon as 5s passed since a unit was added to our GC queue, make sure to run a gc sweep */
  66 #define GC_QUEUE_USEC_MAX (10*USEC_PER_SEC)
  67
  68 /* Where clients shall send notification messages to */
  69 #define NOTIFY_SOCKET "/org/freedesktop/systemd1/notify"
  70
  71 static int manager_setup_notify(Manager *m) {
  72         union {
  73                 struct sockaddr sa;
  74                 struct sockaddr_un un;
  75         } sa;
  76         struct epoll_event ev;
  77         int one = 1;
  78
  79         assert(m);
  80
  81         m->notify_watch.type = WATCH_NOTIFY;
  82         if ((m->notify_watch.fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
  83                 log_error("Failed to allocate notification socket: %m");
  84                 return -errno;
  85         }
  86
  87         zero(sa);
  88         sa.sa.sa_family = AF_UNIX;
  89
  90         if (getpid() != 1)
  91                 snprintf(sa.un.sun_path+1, sizeof(sa.un.sun_path)-1, NOTIFY_SOCKET "/%llu", random_ull());
  92         else
  93                 strncpy(sa.un.sun_path+1, NOTIFY_SOCKET, sizeof(sa.un.sun_path)-1);
  94
  95         if (bind(m->notify_watch.fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
  96                 log_error("bind() failed: %m");
  97                 return -errno;
  98         }
  99
 100         if (setsockopt(m->notify_watch.fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
 101                 log_error("SO_PASSCRED failed: %m");
 102                 return -errno;
 103         }
 104
 105         zero(ev);
 106         ev.events = EPOLLIN;
 107         ev.data.ptr = &m->notify_watch;
 108
 109         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->notify_watch.fd, &ev) < 0)
 110                 return -errno;
 111
 112         if (!(m->notify_socket = strdup(sa.un.sun_path+1)))
 113                 return -ENOMEM;
 114
 115         log_debug("Using notification socket %s", m->notify_socket);
 116
 117         return 0;
 118 }
 119
 120 static int enable_special_signals(Manager *m) {
 121         char fd;
 122
 123         assert(m);
 124
 125         /* Enable that we get SIGINT on control-alt-del */
 126         if (reboot(RB_DISABLE_CAD) < 0)
 127                 log_warning("Failed to enable ctrl-alt-del handling: %m");
 128
 129         if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY)) < 0)
 130                 log_warning("Failed to open /dev/tty0: %m");
 131         else {
 132                 /* Enable that we get SIGWINCH on kbrequest */
 133                 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
 134                         log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
 135
 136                 close_nointr_nofail(fd);
 137         }
 138
 139         return 0;
 140 }
 141
 142 static int manager_setup_signals(Manager *m) {
 143         sigset_t mask;
 144         struct epoll_event ev;
 145         struct sigaction sa;
 146
 147         assert(m);
 148
 149         /* We are not interested in SIGSTOP and friends. */
 150         zero(sa);
 151         sa.sa_handler = SIG_DFL;
 152         sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
 153         assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 154
 155         assert_se(sigemptyset(&mask) == 0);
 156
 157         sigset_add_many(&mask,
 158                         SIGCHLD,     /* Child died */
 159                         SIGTERM,     /* Reexecute daemon */
 160                         SIGHUP,      /* Reload configuration */
 161                         SIGUSR1,     /* systemd/upstart: reconnect to D-Bus */
 162                         SIGUSR2,     /* systemd: dump status */
 163                         SIGINT,      /* Kernel sends us this on control-alt-del */
 164                         SIGWINCH,    /* Kernel sends us this on kbrequest (alt-arrowup) */
 165                         SIGPWR,      /* Some kernel drivers and upsd send us this on power failure */
 166                         SIGRTMIN+0,  /* systemd: start default.target */
 167                         SIGRTMIN+1,  /* systemd: isolate rescue.target */
 168                         SIGRTMIN+2,  /* systemd: isolate emergency.target */
 169                         SIGRTMIN+3,  /* systemd: start halt.target */
 170                         SIGRTMIN+4,  /* systemd: start poweroff.target */
 171                         SIGRTMIN+5,  /* systemd: start reboot.target */
 172                         SIGRTMIN+6,  /* systemd: start kexec.target */
 173                         SIGRTMIN+13, /* systemd: Immediate halt */
 174                         SIGRTMIN+14, /* systemd: Immediate poweroff */
 175                         SIGRTMIN+15, /* systemd: Immediate reboot */
 176                         SIGRTMIN+16, /* systemd: Immediate kexec */
 177                         SIGRTMIN+20, /* systemd: enable status messages */
 178                         SIGRTMIN+21, /* systemd: disable status messages */
 179                         -1);
 180         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
 181
 182         m->signal_watch.type = WATCH_SIGNAL;
 183         if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
 184                 return -errno;
 185
 186         zero(ev);
 187         ev.events = EPOLLIN;
 188         ev.data.ptr = &m->signal_watch;
 189
 190         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
 191                 return -errno;
 192
 193         if (m->running_as == MANAGER_SYSTEM)
 194                 return enable_special_signals(m);
 195
 196         return 0;
 197 }
 198
 199 int manager_new(ManagerRunningAs running_as, Manager **_m) {
 200         Manager *m;
 201         int r = -ENOMEM;
 202
 203         assert(_m);
 204         assert(running_as >= 0);
 205         assert(running_as < _MANAGER_RUNNING_AS_MAX);
 206
 207         if (!(m = new0(Manager, 1)))
 208                 return -ENOMEM;
 209
 210         dual_timestamp_get(&m->startup_timestamp);
 211
 212         m->running_as = running_as;
 213         m->name_data_slot = m->subscribed_data_slot = -1;
 214         m->exit_code = _MANAGER_EXIT_CODE_INVALID;
 215         m->pin_cgroupfs_fd = -1;
 216
 217 #ifdef HAVE_AUDIT
 218         m->audit_fd = -1;
 219 #endif
 220
 221         m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = m->swap_watch.fd = -1;
 222         m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
 223
 224         if (!(m->environment = strv_copy(environ)))
 225                 goto fail;
 226
 227         if (!(m->default_controllers = strv_new("cpu", NULL)))
 228                 goto fail;
 229
 230         if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
 231                 goto fail;
 232
 233         if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
 234                 goto fail;
 235
 236         if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
 237                 goto fail;
 238
 239         if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
 240                 goto fail;
 241
 242         if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
 243                 goto fail;
 244
 245         if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
 246                 goto fail;
 247
 248         if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
 249                 goto fail;
 250
 251         if ((r = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
 252                 goto fail;
 253
 254         if ((r = manager_setup_signals(m)) < 0)
 255                 goto fail;
 256
 257         if ((r = manager_setup_cgroup(m)) < 0)
 258                 goto fail;
 259
 260         if ((r = manager_setup_notify(m)) < 0)
 261                 goto fail;
 262
 263         /* Try to connect to the busses, if possible. */
 264         if ((r = bus_init(m, running_as != MANAGER_SYSTEM)) < 0)
 265                 goto fail;
 266
 267 #ifdef HAVE_AUDIT
 268         if ((m->audit_fd = audit_open()) < 0)
 269                 log_error("Failed to connect to audit log: %m");
 270 #endif
 271
 272         *_m = m;
 273         return 0;
 274
 275 fail:
 276         manager_free(m);
 277         return r;
 278 }
 279
 280 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
 281         Meta *meta;
 282         unsigned n = 0;
 283
 284         assert(m);
 285
 286         while ((meta = m->cleanup_queue)) {
 287                 assert(meta->in_cleanup_queue);
 288
 289                 unit_free((Unit*) meta);
 290                 n++;
 291         }
 292
 293         return n;
 294 }
 295
 296 enum {
 297         GC_OFFSET_IN_PATH,  /* This one is on the path we were travelling */
 298         GC_OFFSET_UNSURE,   /* No clue */
 299         GC_OFFSET_GOOD,     /* We still need this unit */
 300         GC_OFFSET_BAD,      /* We don't need this unit anymore */
 301         _GC_OFFSET_MAX
 302 };
 303
 304 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
 305         Iterator i;
 306         Unit *other;
 307         bool is_bad;
 308
 309         assert(u);
 310
 311         if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
 312             u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
 313             u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
 314                 return;
 315
 316         if (u->meta.in_cleanup_queue)
 317                 goto bad;
 318
 319         if (unit_check_gc(u))
 320                 goto good;
 321
 322         u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
 323
 324         is_bad = true;
 325
 326         SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
 327                 unit_gc_sweep(other, gc_marker);
 328
 329                 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
 330                         goto good;
 331
 332                 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
 333                         is_bad = false;
 334         }
 335
 336         if (is_bad)
 337                 goto bad;
 338
 339         /* We were unable to find anything out about this entry, so
 340          * let's investigate it later */
 341         u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
 342         unit_add_to_gc_queue(u);
 343         return;
 344
 345 bad:
 346         /* We definitely know that this one is not useful anymore, so
 347          * let's mark it for deletion */
 348         u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
 349         unit_add_to_cleanup_queue(u);
 350         return;
 351
 352 good:
 353         u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
 354 }
 355
 356 static unsigned manager_dispatch_gc_queue(Manager *m) {
 357         Meta *meta;
 358         unsigned n = 0;
 359         unsigned gc_marker;
 360
 361         assert(m);
 362
 363         if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
 364             (m->gc_queue_timestamp <= 0 ||
 365              (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
 366                 return 0;
 367
 368         log_debug("Running GC...");
 369
 370         m->gc_marker += _GC_OFFSET_MAX;
 371         if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
 372                 m->gc_marker = 1;
 373
 374         gc_marker = m->gc_marker;
 375
 376         while ((meta = m->gc_queue)) {
 377                 assert(meta->in_gc_queue);
 378
 379                 unit_gc_sweep((Unit*) meta, gc_marker);
 380
 381                 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
 382                 meta->in_gc_queue = false;
 383
 384                 n++;
 385
 386                 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
 387                     meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
 388                         log_debug("Collecting %s", meta->id);
 389                         meta->gc_marker = gc_marker + GC_OFFSET_BAD;
 390                         unit_add_to_cleanup_queue((Unit*) meta);
 391                 }
 392         }
 393
 394         m->n_in_gc_queue = 0;
 395         m->gc_queue_timestamp = 0;
 396
 397         return n;
 398 }
 399
 400 static void manager_clear_jobs_and_units(Manager *m) {
 401         Job *j;
 402         Unit *u;
 403
 404         assert(m);
 405
 406         while ((j = hashmap_first(m->transaction_jobs)))
 407                 job_free(j);
 408
 409         while ((u = hashmap_first(m->units)))
 410                 unit_free(u);
 411
 412         manager_dispatch_cleanup_queue(m);
 413
 414         assert(!m->load_queue);
 415         assert(!m->run_queue);
 416         assert(!m->dbus_unit_queue);
 417         assert(!m->dbus_job_queue);
 418         assert(!m->cleanup_queue);
 419         assert(!m->gc_queue);
 420
 421         assert(hashmap_isempty(m->transaction_jobs));
 422         assert(hashmap_isempty(m->jobs));
 423         assert(hashmap_isempty(m->units));
 424 }
 425
 426 void manager_free(Manager *m) {
 427         UnitType c;
 428
 429         assert(m);
 430
 431         manager_clear_jobs_and_units(m);
 432
 433         for (c = 0; c < _UNIT_TYPE_MAX; c++)
 434                 if (unit_vtable[c]->shutdown)
 435                         unit_vtable[c]->shutdown(m);
 436
 437         /* If we reexecute ourselves, we keep the root cgroup
 438          * around */
 439         manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
 440
 441         manager_undo_generators(m);
 442
 443         bus_done(m);
 444
 445         hashmap_free(m->units);
 446         hashmap_free(m->jobs);
 447         hashmap_free(m->transaction_jobs);
 448         hashmap_free(m->watch_pids);
 449         hashmap_free(m->watch_bus);
 450
 451         if (m->epoll_fd >= 0)
 452                 close_nointr_nofail(m->epoll_fd);
 453         if (m->signal_watch.fd >= 0)
 454                 close_nointr_nofail(m->signal_watch.fd);
 455         if (m->notify_watch.fd >= 0)
 456                 close_nointr_nofail(m->notify_watch.fd);
 457
 458 #ifdef HAVE_AUDIT
 459         if (m->audit_fd >= 0)
 460                 audit_close(m->audit_fd);
 461 #endif
 462
 463         free(m->notify_socket);
 464
 465         lookup_paths_free(&m->lookup_paths);
 466         strv_free(m->environment);
 467
 468         strv_free(m->default_controllers);
 469
 470         hashmap_free(m->cgroup_bondings);
 471         set_free_free(m->unit_path_cache);
 472
 473         free(m);
 474 }
 475
 476 int manager_enumerate(Manager *m) {
 477         int r = 0, q;
 478         UnitType c;
 479
 480         assert(m);
 481
 482         /* Let's ask every type to load all units from disk/kernel
 483          * that it might know */
 484         for (c = 0; c < _UNIT_TYPE_MAX; c++)
 485                 if (unit_vtable[c]->enumerate)
 486                         if ((q = unit_vtable[c]->enumerate(m)) < 0)
 487                                 r = q;
 488
 489         manager_dispatch_load_queue(m);
 490         return r;
 491 }
 492
 493 int manager_coldplug(Manager *m) {
 494         int r = 0, q;
 495         Iterator i;
 496         Unit *u;
 497         char *k;
 498
 499         assert(m);
 500
 501         /* Then, let's set up their initial state. */
 502         HASHMAP_FOREACH_KEY(u, k, m->units, i) {
 503
 504                 /* ignore aliases */
 505                 if (u->meta.id != k)
 506                         continue;
 507
 508                 if ((q = unit_coldplug(u)) < 0)
 509                         r = q;
 510         }
 511
 512         return r;
 513 }
 514
 515 static void manager_build_unit_path_cache(Manager *m) {
 516         char **i;
 517         DIR *d = NULL;
 518         int r;
 519
 520         assert(m);
 521
 522         set_free_free(m->unit_path_cache);
 523
 524         if (!(m->unit_path_cache = set_new(string_hash_func, string_compare_func))) {
 525                 log_error("Failed to allocate unit path cache.");
 526                 return;
 527         }
 528
 529         /* This simply builds a list of files we know exist, so that
 530          * we don't always have to go to disk */
 531
 532         STRV_FOREACH(i, m->lookup_paths.unit_path) {
 533                 struct dirent *de;
 534
 535                 if (!(d = opendir(*i))) {
 536                         log_error("Failed to open directory: %m");
 537                         continue;
 538                 }
 539
 540                 while ((de = readdir(d))) {
 541                         char *p;
 542
 543                         if (ignore_file(de->d_name))
 544                                 continue;
 545
 546                         if (asprintf(&p, "%s/%s", streq(*i, "/") ? "" : *i, de->d_name) < 0) {
 547                                 r = -ENOMEM;
 548                                 goto fail;
 549                         }
 550
 551                         if ((r = set_put(m->unit_path_cache, p)) < 0) {
 552                                 free(p);
 553                                 goto fail;
 554                         }
 555                 }
 556
 557                 closedir(d);
 558                 d = NULL;
 559         }
 560
 561         return;
 562
 563 fail:
 564         log_error("Failed to build unit path cache: %s", strerror(-r));
 565
 566         set_free_free(m->unit_path_cache);
 567         m->unit_path_cache = NULL;
 568
 569         if (d)
 570                 closedir(d);
 571 }
 572
 573 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
 574         int r, q;
 575
 576         assert(m);
 577
 578         manager_run_generators(m);
 579
 580         manager_build_unit_path_cache(m);
 581
 582         /* If we will deserialize make sure that during enumeration
 583          * this is already known, so we increase the counter here
 584          * already */
 585         if (serialization)
 586                 m->n_deserializing ++;
 587
 588         /* First, enumerate what we can from all config files */
 589         r = manager_enumerate(m);
 590
 591         /* Second, deserialize if there is something to deserialize */
 592         if (serialization)
 593                 if ((q = manager_deserialize(m, serialization, fds)) < 0)
 594                         r = q;
 595
 596         /* Third, fire things up! */
 597         if ((q = manager_coldplug(m)) < 0)
 598                 r = q;
 599
 600         if (serialization) {
 601                 assert(m->n_deserializing > 0);
 602                 m->n_deserializing --;
 603         }
 604
 605         return r;
 606 }
 607
 608 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
 609         assert(m);
 610         assert(j);
 611
 612         /* Deletes one job from the transaction */
 613
 614         manager_transaction_unlink_job(m, j, delete_dependencies);
 615
 616         if (!j->installed)
 617                 job_free(j);
 618 }
 619
 620 static void transaction_delete_unit(Manager *m, Unit *u) {
 621         Job *j;
 622
 623         /* Deletes all jobs associated with a certain unit from the
 624          * transaction */
 625
 626         while ((j = hashmap_get(m->transaction_jobs, u)))
 627                 transaction_delete_job(m, j, true);
 628 }
 629
 630 static void transaction_clean_dependencies(Manager *m) {
 631         Iterator i;
 632         Job *j;
 633
 634         assert(m);
 635
 636         /* Drops all dependencies of all installed jobs */
 637
 638         HASHMAP_FOREACH(j, m->jobs, i) {
 639                 while (j->subject_list)
 640                         job_dependency_free(j->subject_list);
 641                 while (j->object_list)
 642                         job_dependency_free(j->object_list);
 643         }
 644
 645         assert(!m->transaction_anchor);
 646 }
 647
 648 static void transaction_abort(Manager *m) {
 649         Job *j;
 650
 651         assert(m);
 652
 653         while ((j = hashmap_first(m->transaction_jobs)))
 654                 if (j->installed)
 655                         transaction_delete_job(m, j, true);
 656                 else
 657                         job_free(j);
 658
 659         assert(hashmap_isempty(m->transaction_jobs));
 660
 661         transaction_clean_dependencies(m);
 662 }
 663
 664 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
 665         JobDependency *l;
 666
 667         assert(m);
 668
 669         /* A recursive sweep through the graph that marks all units
 670          * that matter to the anchor job, i.e. are directly or
 671          * indirectly a dependency of the anchor job via paths that
 672          * are fully marked as mattering. */
 673
 674         if (j)
 675                 l = j->subject_list;
 676         else
 677                 l = m->transaction_anchor;
 678
 679         LIST_FOREACH(subject, l, l) {
 680
 681                 /* This link does not matter */
 682                 if (!l->matters)
 683                         continue;
 684
 685                 /* This unit has already been marked */
 686                 if (l->object->generation == generation)
 687                         continue;
 688
 689                 l->object->matters_to_anchor = true;
 690                 l->object->generation = generation;
 691
 692                 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
 693         }
 694 }
 695
 696 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
 697         JobDependency *l, *last;
 698
 699         assert(j);
 700         assert(other);
 701         assert(j->unit == other->unit);
 702         assert(!j->installed);
 703
 704         /* Merges 'other' into 'j' and then deletes j. */
 705
 706         j->type = t;
 707         j->state = JOB_WAITING;
 708         j->override = j->override || other->override;
 709
 710         j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
 711
 712         /* Patch us in as new owner of the JobDependency objects */
 713         last = NULL;
 714         LIST_FOREACH(subject, l, other->subject_list) {
 715                 assert(l->subject == other);
 716                 l->subject = j;
 717                 last = l;
 718         }
 719
 720         /* Merge both lists */
 721         if (last) {
 722                 last->subject_next = j->subject_list;
 723                 if (j->subject_list)
 724                         j->subject_list->subject_prev = last;
 725                 j->subject_list = other->subject_list;
 726         }
 727
 728         /* Patch us in as new owner of the JobDependency objects */
 729         last = NULL;
 730         LIST_FOREACH(object, l, other->object_list) {
 731                 assert(l->object == other);
 732                 l->object = j;
 733                 last = l;
 734         }
 735
 736         /* Merge both lists */
 737         if (last) {
 738                 last->object_next = j->object_list;
 739                 if (j->object_list)
 740                         j->object_list->object_prev = last;
 741                 j->object_list = other->object_list;
 742         }
 743
 744         /* Kill the other job */
 745         other->subject_list = NULL;
 746         other->object_list = NULL;
 747         transaction_delete_job(m, other, true);
 748 }
 749 static bool job_is_conflicted_by(Job *j) {
 750         JobDependency *l;
 751
 752         assert(j);
 753
 754         /* Returns true if this job is pulled in by a least one
 755          * ConflictedBy dependency. */
 756
 757         LIST_FOREACH(object, l, j->object_list)
 758                 if (l->conflicts)
 759                         return true;
 760
 761         return false;
 762 }
 763
 764 static int delete_one_unmergeable_job(Manager *m, Job *j) {
 765         Job *k;
 766
 767         assert(j);
 768
 769         /* Tries to delete one item in the linked list
 770          * j->transaction_next->transaction_next->... that conflicts
 771          * whith another one, in an attempt to make an inconsistent
 772          * transaction work. */
 773
 774         /* We rely here on the fact that if a merged with b does not
 775          * merge with c, either a or b merge with c neither */
 776         LIST_FOREACH(transaction, j, j)
 777                 LIST_FOREACH(transaction, k, j->transaction_next) {
 778                         Job *d;
 779
 780                         /* Is this one mergeable? Then skip it */
 781                         if (job_type_is_mergeable(j->type, k->type))
 782                                 continue;
 783
 784                         /* Ok, we found two that conflict, let's see if we can
 785                          * drop one of them */
 786                         if (!j->matters_to_anchor && !k->matters_to_anchor) {
 787
 788                                 /* Both jobs don't matter, so let's
 789                                  * find the one that is smarter to
 790                                  * remove. Let's think positive and
 791                                  * rather remove stops then starts --
 792                                  * except if something is being
 793                                  * stopped because it is conflicted by
 794                                  * another unit in which case we
 795                                  * rather remove the start. */
 796
 797                                 log_debug("Looking at job %s/%s conflicted_by=%s", j->unit->meta.id, job_type_to_string(j->type), yes_no(j->type == JOB_STOP && job_is_conflicted_by(j)));
 798                                 log_debug("Looking at job %s/%s conflicted_by=%s", k->unit->meta.id, job_type_to_string(k->type), yes_no(k->type == JOB_STOP && job_is_conflicted_by(k)));
 799
 800                                 if (j->type == JOB_STOP) {
 801
 802                                         if (job_is_conflicted_by(j))
 803                                                 d = k;
 804                                         else
 805                                                 d = j;
 806
 807                                 } else if (k->type == JOB_STOP) {
 808
 809                                         if (job_is_conflicted_by(k))
 810                                                 d = j;
 811                                         else
 812                                                 d = k;
 813                                 } else
 814                                         d = j;
 815
 816                         } else if (!j->matters_to_anchor)
 817                                 d = j;
 818                         else if (!k->matters_to_anchor)
 819                                 d = k;
 820                         else
 821                                 return -ENOEXEC;
 822
 823                         /* Ok, we can drop one, so let's do so. */
 824                         log_debug("Fixing conflicting jobs by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
 825                         transaction_delete_job(m, d, true);
 826                         return 0;
 827                 }
 828
 829         return -EINVAL;
 830 }
 831
 832 static int transaction_merge_jobs(Manager *m, DBusError *e) {
 833         Job *j;
 834         Iterator i;
 835         int r;
 836
 837         assert(m);
 838
 839         /* First step, check whether any of the jobs for one specific
 840          * task conflict. If so, try to drop one of them. */
 841         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 842                 JobType t;
 843                 Job *k;
 844
 845                 t = j->type;
 846                 LIST_FOREACH(transaction, k, j->transaction_next) {
 847                         if (job_type_merge(&t, k->type) >= 0)
 848                                 continue;
 849
 850                         /* OK, we could not merge all jobs for this
 851                          * action. Let's see if we can get rid of one
 852                          * of them */
 853
 854                         if ((r = delete_one_unmergeable_job(m, j)) >= 0)
 855                                 /* Ok, we managed to drop one, now
 856                                  * let's ask our callers to call us
 857                                  * again after garbage collecting */
 858                                 return -EAGAIN;
 859
 860                         /* We couldn't merge anything. Failure */
 861                         dbus_set_error(e, BUS_ERROR_TRANSACTION_JOBS_CONFLICTING, "Transaction contains conflicting jobs '%s' and '%s' for %s. Probably contradicting requirement dependencies configured.",
 862                                        job_type_to_string(t), job_type_to_string(k->type), k->unit->meta.id);
 863                         return r;
 864                 }
 865         }
 866
 867         /* Second step, merge the jobs. */
 868         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 869                 JobType t = j->type;
 870                 Job *k;
 871
 872                 /* Merge all transactions */
 873                 LIST_FOREACH(transaction, k, j->transaction_next)
 874                         assert_se(job_type_merge(&t, k->type) == 0);
 875
 876                 /* If an active job is mergeable, merge it too */
 877                 if (j->unit->meta.job)
 878                         job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
 879
 880                 while ((k = j->transaction_next)) {
 881                         if (j->installed) {
 882                                 transaction_merge_and_delete_job(m, k, j, t);
 883                                 j = k;
 884                         } else
 885                                 transaction_merge_and_delete_job(m, j, k, t);
 886                 }
 887
 888                 assert(!j->transaction_next);
 889                 assert(!j->transaction_prev);
 890         }
 891
 892         return 0;
 893 }
 894
 895 static void transaction_drop_redundant(Manager *m) {
 896         bool again;
 897
 898         assert(m);
 899
 900         /* Goes through the transaction and removes all jobs that are
 901          * a noop */
 902
 903         do {
 904                 Job *j;
 905                 Iterator i;
 906
 907                 again = false;
 908
 909                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 910                         bool changes_something = false;
 911                         Job *k;
 912
 913                         LIST_FOREACH(transaction, k, j) {
 914
 915                                 if (!job_is_anchor(k) &&
 916                                     (j->installed || job_type_is_redundant(k->type, unit_active_state(k->unit))))
 917                                         continue;
 918
 919                                 changes_something = true;
 920                                 break;
 921                         }
 922
 923                         if (changes_something)
 924                                 continue;
 925
 926                         /* log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type)); */
 927                         transaction_delete_job(m, j, false);
 928                         again = true;
 929                         break;
 930                 }
 931
 932         } while (again);
 933 }
 934
 935 static bool unit_matters_to_anchor(Unit *u, Job *j) {
 936         assert(u);
 937         assert(!j->transaction_prev);
 938
 939         /* Checks whether at least one of the jobs for this unit
 940          * matters to the anchor. */
 941
 942         LIST_FOREACH(transaction, j, j)
 943                 if (j->matters_to_anchor)
 944                         return true;
 945
 946         return false;
 947 }
 948
 949 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation, DBusError *e) {
 950         Iterator i;
 951         Unit *u;
 952         int r;
 953
 954         assert(m);
 955         assert(j);
 956         assert(!j->transaction_prev);
 957
 958         /* Does a recursive sweep through the ordering graph, looking
 959          * for a cycle. If we find cycle we try to break it. */
 960
 961         /* Have we seen this before? */
 962         if (j->generation == generation) {
 963                 Job *k, *delete;
 964
 965                 /* If the marker is NULL we have been here already and
 966                  * decided the job was loop-free from here. Hence
 967                  * shortcut things and return right-away. */
 968                 if (!j->marker)
 969                         return 0;
 970
 971                 /* So, the marker is not NULL and we already have been
 972                  * here. We have a cycle. Let's try to break it. We go
 973                  * backwards in our path and try to find a suitable
 974                  * job to remove. We use the marker to find our way
 975                  * back, since smart how we are we stored our way back
 976                  * in there. */
 977                 log_warning("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
 978
 979                 delete = NULL;
 980                 for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
 981
 982                         log_info("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
 983
 984                         if (!delete &&
 985                             !k->installed &&
 986                             !unit_matters_to_anchor(k->unit, k)) {
 987                                 /* Ok, we can drop this one, so let's
 988                                  * do so. */
 989                                 delete = k;
 990                         }
 991
 992                         /* Check if this in fact was the beginning of
 993                          * the cycle */
 994                         if (k == j)
 995                                 break;
 996                 }
 997
 998
 999                 if (delete) {
1000                         log_warning("Breaking ordering cycle by deleting job %s/%s", delete->unit->meta.id, job_type_to_string(delete->type));
1001                         transaction_delete_unit(m, delete->unit);
1002                         return -EAGAIN;
1003                 }
1004
1005                 log_error("Unable to break cycle");
1006
1007                 dbus_set_error(e, BUS_ERROR_TRANSACTION_ORDER_IS_CYCLIC, "Transaction order is cyclic. See system logs for details.");
1008                 return -ENOEXEC;
1009         }
1010
1011         /* Make the marker point to where we come from, so that we can
1012          * find our way backwards if we want to break a cycle. We use
1013          * a special marker for the beginning: we point to
1014          * ourselves. */
1015         j->marker = from ? from : j;
1016         j->generation = generation;
1017
1018         /* We assume that the the dependencies are bidirectional, and
1019          * hence can ignore UNIT_AFTER */
1020         SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
1021                 Job *o;
1022
1023                 /* Is there a job for this unit? */
1024                 if (!(o = hashmap_get(m->transaction_jobs, u)))
1025
1026                         /* Ok, there is no job for this in the
1027                          * transaction, but maybe there is already one
1028                          * running? */
1029                         if (!(o = u->meta.job))
1030                                 continue;
1031
1032                 if ((r = transaction_verify_order_one(m, o, j, generation, e)) < 0)
1033                         return r;
1034         }
1035
1036         /* Ok, let's backtrack, and remember that this entry is not on
1037          * our path anymore. */
1038         j->marker = NULL;
1039
1040         return 0;
1041 }
1042
1043 static int transaction_verify_order(Manager *m, unsigned *generation, DBusError *e) {
1044         Job *j;
1045         int r;
1046         Iterator i;
1047         unsigned g;
1048
1049         assert(m);
1050         assert(generation);
1051
1052         /* Check if the ordering graph is cyclic. If it is, try to fix
1053          * that up by dropping one of the jobs. */
1054
1055         g = (*generation)++;
1056
1057         HASHMAP_FOREACH(j, m->transaction_jobs, i)
1058                 if ((r = transaction_verify_order_one(m, j, NULL, g, e)) < 0)
1059                         return r;
1060
1061         return 0;
1062 }
1063
1064 static void transaction_collect_garbage(Manager *m) {
1065         bool again;
1066
1067         assert(m);
1068
1069         /* Drop jobs that are not required by any other job */
1070
1071         do {
1072                 Iterator i;
1073                 Job *j;
1074
1075                 again = false;
1076
1077                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1078                         if (j->object_list) {
1079                                 /* log_debug("Keeping job %s/%s because of %s/%s", */
1080                                 /*           j->unit->meta.id, job_type_to_string(j->type), */
1081                                 /*           j->object_list->subject ? j->object_list->subject->unit->meta.id : "root", */
1082                                 /*           j->object_list->subject ? job_type_to_string(j->object_list->subject->type) : "root"); */
1083                                 continue;
1084                         }
1085
1086                         /* log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type)); */
1087                         transaction_delete_job(m, j, true);
1088                         again = true;
1089                         break;
1090                 }
1091
1092         } while (again);
1093 }
1094
1095 static int transaction_is_destructive(Manager *m, DBusError *e) {
1096         Iterator i;
1097         Job *j;
1098
1099         assert(m);
1100
1101         /* Checks whether applying this transaction means that
1102          * existing jobs would be replaced */
1103
1104         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1105
1106                 /* Assume merged */
1107                 assert(!j->transaction_prev);
1108                 assert(!j->transaction_next);
1109
1110                 if (j->unit->meta.job &&
1111                     j->unit->meta.job != j &&
1112                     !job_type_is_superset(j->type, j->unit->meta.job->type)) {
1113
1114                         dbus_set_error(e, BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE, "Transaction is destructive.");
1115                         return -EEXIST;
1116                 }
1117         }
1118
1119         return 0;
1120 }
1121
1122 static void transaction_minimize_impact(Manager *m) {
1123         bool again;
1124         assert(m);
1125
1126         /* Drops all unnecessary jobs that reverse already active jobs
1127          * or that stop a running service. */
1128
1129         do {
1130                 Job *j;
1131                 Iterator i;
1132
1133                 again = false;
1134
1135                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1136                         LIST_FOREACH(transaction, j, j) {
1137                                 bool stops_running_service, changes_existing_job;
1138
1139                                 /* If it matters, we shouldn't drop it */
1140                                 if (j->matters_to_anchor)
1141                                         continue;
1142
1143                                 /* Would this stop a running service?
1144                                  * Would this change an existing job?
1145                                  * If so, let's drop this entry */
1146
1147                                 stops_running_service =
1148                                         j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1149
1150                                 changes_existing_job =
1151                                         j->unit->meta.job &&
1152                                         job_type_is_conflicting(j->type, j->unit->meta.job->type);
1153
1154                                 if (!stops_running_service && !changes_existing_job)
1155                                         continue;
1156
1157                                 if (stops_running_service)
1158                                         log_info("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1159
1160                                 if (changes_existing_job)
1161                                         log_info("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1162
1163                                 /* Ok, let's get rid of this */
1164                                 log_info("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1165
1166                                 transaction_delete_job(m, j, true);
1167                                 again = true;
1168                                 break;
1169                         }
1170
1171                         if (again)
1172                                 break;
1173                 }
1174
1175         } while (again);
1176 }
1177
1178 static int transaction_apply(Manager *m) {
1179         Iterator i;
1180         Job *j;
1181         int r;
1182
1183         /* Moves the transaction jobs to the set of active jobs */
1184
1185         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1186                 /* Assume merged */
1187                 assert(!j->transaction_prev);
1188                 assert(!j->transaction_next);
1189
1190                 if (j->installed)
1191                         continue;
1192
1193                 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1194                         goto rollback;
1195         }
1196
1197         while ((j = hashmap_steal_first(m->transaction_jobs))) {
1198                 if (j->installed) {
1199                         /* log_debug("Skipping already installed job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id); */
1200                         continue;
1201                 }
1202
1203                 if (j->unit->meta.job)
1204                         job_free(j->unit->meta.job);
1205
1206                 j->unit->meta.job = j;
1207                 j->installed = true;
1208                 m->n_installed_jobs ++;
1209
1210                 /* We're fully installed. Now let's free data we don't
1211                  * need anymore. */
1212
1213                 assert(!j->transaction_next);
1214                 assert(!j->transaction_prev);
1215
1216                 job_add_to_run_queue(j);
1217                 job_add_to_dbus_queue(j);
1218                 job_start_timer(j);
1219
1220                 log_debug("Installed new job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id);
1221         }
1222
1223         /* As last step, kill all remaining job dependencies. */
1224         transaction_clean_dependencies(m);
1225
1226         return 0;
1227
1228 rollback:
1229
1230         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1231                 if (j->installed)
1232                         continue;
1233
1234                 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1235         }
1236
1237         return r;
1238 }
1239
1240 static int transaction_activate(Manager *m, JobMode mode, DBusError *e) {
1241         int r;
1242         unsigned generation = 1;
1243
1244         assert(m);
1245
1246         /* This applies the changes recorded in transaction_jobs to
1247          * the actual list of jobs, if possible. */
1248
1249         /* First step: figure out which jobs matter */
1250         transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1251
1252         /* Second step: Try not to stop any running services if
1253          * we don't have to. Don't try to reverse running
1254          * jobs if we don't have to. */
1255         if (mode == JOB_FAIL)
1256                 transaction_minimize_impact(m);
1257
1258         /* Third step: Drop redundant jobs */
1259         transaction_drop_redundant(m);
1260
1261         for (;;) {
1262                 /* Fourth step: Let's remove unneeded jobs that might
1263                  * be lurking. */
1264                 transaction_collect_garbage(m);
1265
1266                 /* Fifth step: verify order makes sense and correct
1267                  * cycles if necessary and possible */
1268                 if ((r = transaction_verify_order(m, &generation, e)) >= 0)
1269                         break;
1270
1271                 if (r != -EAGAIN) {
1272                         log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r));
1273                         goto rollback;
1274                 }
1275
1276                 /* Let's see if the resulting transaction ordering
1277                  * graph is still cyclic... */
1278         }
1279
1280         for (;;) {
1281                 /* Sixth step: let's drop unmergeable entries if
1282                  * necessary and possible, merge entries we can
1283                  * merge */
1284                 if ((r = transaction_merge_jobs(m, e)) >= 0)
1285                         break;
1286
1287                 if (r != -EAGAIN) {
1288                         log_warning("Requested transaction contains unmergable jobs: %s", bus_error(e, r));
1289                         goto rollback;
1290                 }
1291
1292                 /* Seventh step: an entry got dropped, let's garbage
1293                  * collect its dependencies. */
1294                 transaction_collect_garbage(m);
1295
1296                 /* Let's see if the resulting transaction still has
1297                  * unmergeable entries ... */
1298         }
1299
1300         /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1301         transaction_drop_redundant(m);
1302
1303         /* Ninth step: check whether we can actually apply this */
1304         if (mode == JOB_FAIL)
1305                 if ((r = transaction_is_destructive(m, e)) < 0) {
1306                         log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r));
1307                         goto rollback;
1308                 }
1309
1310         /* Tenth step: apply changes */
1311         if ((r = transaction_apply(m)) < 0) {
1312                 log_warning("Failed to apply transaction: %s", strerror(-r));
1313                 goto rollback;
1314         }
1315
1316         assert(hashmap_isempty(m->transaction_jobs));
1317         assert(!m->transaction_anchor);
1318
1319         return 0;
1320
1321 rollback:
1322         transaction_abort(m);
1323         return r;
1324 }
1325
1326 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1327         Job *j, *f;
1328
1329         assert(m);
1330         assert(unit);
1331
1332         /* Looks for an axisting prospective job and returns that. If
1333          * it doesn't exist it is created and added to the prospective
1334          * jobs list. */
1335
1336         f = hashmap_get(m->transaction_jobs, unit);
1337
1338         LIST_FOREACH(transaction, j, f) {
1339                 assert(j->unit == unit);
1340
1341                 if (j->type == type) {
1342                         if (is_new)
1343                                 *is_new = false;
1344                         return j;
1345                 }
1346         }
1347
1348         if (unit->meta.job && unit->meta.job->type == type)
1349                 j = unit->meta.job;
1350         else if (!(j = job_new(m, type, unit)))
1351                 return NULL;
1352
1353         j->generation = 0;
1354         j->marker = NULL;
1355         j->matters_to_anchor = false;
1356         j->override = override;
1357
1358         LIST_PREPEND(Job, transaction, f, j);
1359
1360         if (hashmap_replace(m->transaction_jobs, unit, f) < 0) {
1361                 job_free(j);
1362                 return NULL;
1363         }
1364
1365         if (is_new)
1366                 *is_new = true;
1367
1368         /* log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type)); */
1369
1370         return j;
1371 }
1372
1373 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1374         assert(m);
1375         assert(j);
1376
1377         if (j->transaction_prev)
1378                 j->transaction_prev->transaction_next = j->transaction_next;
1379         else if (j->transaction_next)
1380                 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1381         else
1382                 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1383
1384         if (j->transaction_next)
1385                 j->transaction_next->transaction_prev = j->transaction_prev;
1386
1387         j->transaction_prev = j->transaction_next = NULL;
1388
1389         while (j->subject_list)
1390                 job_dependency_free(j->subject_list);
1391
1392         while (j->object_list) {
1393                 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1394
1395                 job_dependency_free(j->object_list);
1396
1397                 if (other && delete_dependencies) {
1398                         log_debug("Deleting job %s/%s as dependency of job %s/%s",
1399                                   other->unit->meta.id, job_type_to_string(other->type),
1400                                   j->unit->meta.id, job_type_to_string(j->type));
1401                         transaction_delete_job(m, other, delete_dependencies);
1402                 }
1403         }
1404 }
1405
1406 static int transaction_add_job_and_dependencies(
1407                 Manager *m,
1408                 JobType type,
1409                 Unit *unit,
1410                 Job *by,
1411                 bool matters,
1412                 bool override,
1413                 bool conflicts,
1414                 DBusError *e,
1415                 Job **_ret) {
1416         Job *ret;
1417         Iterator i;
1418         Unit *dep;
1419         int r;
1420         bool is_new;
1421
1422         assert(m);
1423         assert(type < _JOB_TYPE_MAX);
1424         assert(unit);
1425
1426         if (unit->meta.load_state != UNIT_LOADED &&
1427             unit->meta.load_state != UNIT_ERROR &&
1428             unit->meta.load_state != UNIT_MASKED) {
1429                 dbus_set_error(e, BUS_ERROR_LOAD_FAILED, "Unit %s is not loaded properly.", unit->meta.id);
1430                 return -EINVAL;
1431         }
1432
1433         if (type != JOB_STOP && unit->meta.load_state == UNIT_ERROR) {
1434                 dbus_set_error(e, BUS_ERROR_LOAD_FAILED,
1435                                "Unit %s failed to load: %s. "
1436                                "See system logs and 'systemctl status' for details.",
1437                                unit->meta.id,
1438                                strerror(-unit->meta.load_error));
1439                 return -EINVAL;
1440         }
1441
1442         if (type != JOB_STOP && unit->meta.load_state == UNIT_MASKED) {
1443                 dbus_set_error(e, BUS_ERROR_MASKED, "Unit %s is masked.", unit->meta.id);
1444                 return -EINVAL;
1445         }
1446
1447         if (!unit_job_is_applicable(unit, type)) {
1448                 dbus_set_error(e, BUS_ERROR_JOB_TYPE_NOT_APPLICABLE, "Job type %s is not applicable for unit %s.", job_type_to_string(type), unit->meta.id);
1449                 return -EBADR;
1450         }
1451
1452         /* First add the job. */
1453         if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1454                 return -ENOMEM;
1455
1456         /* Then, add a link to the job. */
1457         if (!job_dependency_new(by, ret, matters, conflicts))
1458                 return -ENOMEM;
1459
1460         if (is_new) {
1461                 Set *following;
1462
1463                 /* If we are following some other unit, make sure we
1464                  * add all dependencies of everybody following. */
1465                 if (unit_following_set(ret->unit, &following) > 0) {
1466                         SET_FOREACH(dep, following, i)
1467                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, false, override, false, e, NULL)) < 0) {
1468                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1469
1470                                         if (e)
1471                                                 dbus_error_free(e);
1472                                 }
1473
1474                         set_free(following);
1475                 }
1476
1477                 /* Finally, recursively add in all dependencies. */
1478                 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1479                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1480                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, e, NULL)) < 0) {
1481                                         if (r != -EBADR)
1482                                                 goto fail;
1483
1484                                         if (e)
1485                                                 dbus_error_free(e);
1486                                 }
1487
1488                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BIND_TO], i)
1489                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, e, NULL)) < 0) {
1490
1491                                         if (r != -EBADR)
1492                                                 goto fail;
1493
1494                                         if (e)
1495                                                 dbus_error_free(e);
1496                                 }
1497
1498                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1499                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, false, e, NULL)) < 0) {
1500                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1501
1502                                         if (e)
1503                                                 dbus_error_free(e);
1504                                 }
1505
1506                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1507                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, false, e, NULL)) < 0) {
1508                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1509
1510                                         if (e)
1511                                                 dbus_error_free(e);
1512                                 }
1513
1514                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1515                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, false, e, NULL)) < 0) {
1516
1517                                         if (r != -EBADR)
1518                                                 goto fail;
1519
1520                                         if (e)
1521                                                 dbus_error_free(e);
1522                                 }
1523
1524                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1525                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, e, NULL)) < 0) {
1526                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1527
1528                                         if (e)
1529                                                 dbus_error_free(e);
1530                                 }
1531
1532                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1533                                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, true, e, NULL)) < 0) {
1534
1535                                         if (r != -EBADR)
1536                                                 goto fail;
1537
1538                                         if (e)
1539                                                 dbus_error_free(e);
1540                                 }
1541
1542                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTED_BY], i)
1543                                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, false, override, false, e, NULL)) < 0) {
1544                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1545
1546                                         if (e)
1547                                                 dbus_error_free(e);
1548                                 }
1549
1550                 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1551
1552                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1553                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, e, NULL)) < 0) {
1554
1555                                         if (r != -EBADR)
1556                                                 goto fail;
1557
1558                                         if (e)
1559                                                 dbus_error_free(e);
1560                                 }
1561
1562                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BOUND_BY], i)
1563                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, e, NULL)) < 0) {
1564
1565                                         if (r != -EBADR)
1566                                                 goto fail;
1567
1568                                         if (e)
1569                                                 dbus_error_free(e);
1570                                 }
1571                 }
1572
1573                 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1574         }
1575
1576         if (_ret)
1577                 *_ret = ret;
1578
1579         return 0;
1580
1581 fail:
1582         return r;
1583 }
1584
1585 static int transaction_add_isolate_jobs(Manager *m) {
1586         Iterator i;
1587         Unit *u;
1588         char *k;
1589         int r;
1590
1591         assert(m);
1592
1593         HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1594
1595                 /* ignore aliases */
1596                 if (u->meta.id != k)
1597                         continue;
1598
1599                 if (UNIT_VTABLE(u)->no_isolate)
1600                         continue;
1601
1602                 /* No need to stop inactive jobs */
1603                 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)) && !u->meta.job)
1604                         continue;
1605
1606                 /* Is there already something listed for this? */
1607                 if (hashmap_get(m->transaction_jobs, u))
1608                         continue;
1609
1610                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, false, NULL, NULL)) < 0)
1611                         log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1612         }
1613
1614         return 0;
1615 }
1616
1617 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, DBusError *e, Job **_ret) {
1618         int r;
1619         Job *ret;
1620
1621         assert(m);
1622         assert(type < _JOB_TYPE_MAX);
1623         assert(unit);
1624         assert(mode < _JOB_MODE_MAX);
1625
1626         if (mode == JOB_ISOLATE && type != JOB_START) {
1627                 dbus_set_error(e, BUS_ERROR_INVALID_JOB_MODE, "Isolate is only valid for start.");
1628                 return -EINVAL;
1629         }
1630
1631         if (mode == JOB_ISOLATE && !unit->meta.allow_isolate) {
1632                 dbus_set_error(e, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
1633                 return -EPERM;
1634         }
1635
1636         log_debug("Trying to enqueue job %s/%s/%s", unit->meta.id, job_type_to_string(type), job_mode_to_string(mode));
1637
1638         if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, false, e, &ret)) < 0) {
1639                 transaction_abort(m);
1640                 return r;
1641         }
1642
1643         if (mode == JOB_ISOLATE)
1644                 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1645                         transaction_abort(m);
1646                         return r;
1647                 }
1648
1649         if ((r = transaction_activate(m, mode, e)) < 0)
1650                 return r;
1651
1652         log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1653
1654         if (_ret)
1655                 *_ret = ret;
1656
1657         return 0;
1658 }
1659
1660 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, DBusError *e, Job **_ret) {
1661         Unit *unit;
1662         int r;
1663
1664         assert(m);
1665         assert(type < _JOB_TYPE_MAX);
1666         assert(name);
1667         assert(mode < _JOB_MODE_MAX);
1668
1669         if ((r = manager_load_unit(m, name, NULL, NULL, &unit)) < 0)
1670                 return r;
1671
1672         return manager_add_job(m, type, unit, mode, override, e, _ret);
1673 }
1674
1675 Job *manager_get_job(Manager *m, uint32_t id) {
1676         assert(m);
1677
1678         return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1679 }
1680
1681 Unit *manager_get_unit(Manager *m, const char *name) {
1682         assert(m);
1683         assert(name);
1684
1685         return hashmap_get(m->units, name);
1686 }
1687
1688 unsigned manager_dispatch_load_queue(Manager *m) {
1689         Meta *meta;
1690         unsigned n = 0;
1691
1692         assert(m);
1693
1694         /* Make sure we are not run recursively */
1695         if (m->dispatching_load_queue)
1696                 return 0;
1697
1698         m->dispatching_load_queue = true;
1699
1700         /* Dispatches the load queue. Takes a unit from the queue and
1701          * tries to load its data until the queue is empty */
1702
1703         while ((meta = m->load_queue)) {
1704                 assert(meta->in_load_queue);
1705
1706                 unit_load((Unit*) meta);
1707                 n++;
1708         }
1709
1710         m->dispatching_load_queue = false;
1711         return n;
1712 }
1713
1714 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1715         Unit *ret;
1716         int r;
1717
1718         assert(m);
1719         assert(name || path);
1720
1721         /* This will prepare the unit for loading, but not actually
1722          * load anything from disk. */
1723
1724         if (path && !is_path(path)) {
1725                 dbus_set_error(e, BUS_ERROR_INVALID_PATH, "Path %s is not absolute.", path);
1726                 return -EINVAL;
1727         }
1728
1729         if (!name)
1730                 name = file_name_from_path(path);
1731
1732         if (!unit_name_is_valid(name, false)) {
1733                 dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
1734                 return -EINVAL;
1735         }
1736
1737         if ((ret = manager_get_unit(m, name))) {
1738                 *_ret = ret;
1739                 return 1;
1740         }
1741
1742         if (!(ret = unit_new(m)))
1743                 return -ENOMEM;
1744
1745         if (path)
1746                 if (!(ret->meta.fragment_path = strdup(path))) {
1747                         unit_free(ret);
1748                         return -ENOMEM;
1749                 }
1750
1751         if ((r = unit_add_name(ret, name)) < 0) {
1752                 unit_free(ret);
1753                 return r;
1754         }
1755
1756         unit_add_to_load_queue(ret);
1757         unit_add_to_dbus_queue(ret);
1758         unit_add_to_gc_queue(ret);
1759
1760         if (_ret)
1761                 *_ret = ret;
1762
1763         return 0;
1764 }
1765
1766 int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1767         int r;
1768
1769         assert(m);
1770
1771         /* This will load the service information files, but not actually
1772          * start any services or anything. */
1773
1774         if ((r = manager_load_unit_prepare(m, name, path, e, _ret)) != 0)
1775                 return r;
1776
1777         manager_dispatch_load_queue(m);
1778
1779         if (_ret)
1780                 *_ret = unit_follow_merge(*_ret);
1781
1782         return 0;
1783 }
1784
1785 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1786         Iterator i;
1787         Job *j;
1788
1789         assert(s);
1790         assert(f);
1791
1792         HASHMAP_FOREACH(j, s->jobs, i)
1793                 job_dump(j, f, prefix);
1794 }
1795
1796 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1797         Iterator i;
1798         Unit *u;
1799         const char *t;
1800
1801         assert(s);
1802         assert(f);
1803
1804         HASHMAP_FOREACH_KEY(u, t, s->units, i)
1805                 if (u->meta.id == t)
1806                         unit_dump(u, f, prefix);
1807 }
1808
1809 void manager_clear_jobs(Manager *m) {
1810         Job *j;
1811
1812         assert(m);
1813
1814         transaction_abort(m);
1815
1816         while ((j = hashmap_first(m->jobs)))
1817                 job_free(j);
1818 }
1819
1820 unsigned manager_dispatch_run_queue(Manager *m) {
1821         Job *j;
1822         unsigned n = 0;
1823
1824         if (m->dispatching_run_queue)
1825                 return 0;
1826
1827         m->dispatching_run_queue = true;
1828
1829         while ((j = m->run_queue)) {
1830                 assert(j->installed);
1831                 assert(j->in_run_queue);
1832
1833                 job_run_and_invalidate(j);
1834                 n++;
1835         }
1836
1837         m->dispatching_run_queue = false;
1838         return n;
1839 }
1840
1841 unsigned manager_dispatch_dbus_queue(Manager *m) {
1842         Job *j;
1843         Meta *meta;
1844         unsigned n = 0;
1845
1846         assert(m);
1847
1848         if (m->dispatching_dbus_queue)
1849                 return 0;
1850
1851         m->dispatching_dbus_queue = true;
1852
1853         while ((meta = m->dbus_unit_queue)) {
1854                 assert(meta->in_dbus_queue);
1855
1856                 bus_unit_send_change_signal((Unit*) meta);
1857                 n++;
1858         }
1859
1860         while ((j = m->dbus_job_queue)) {
1861                 assert(j->in_dbus_queue);
1862
1863                 bus_job_send_change_signal(j);
1864                 n++;
1865         }
1866
1867         m->dispatching_dbus_queue = false;
1868         return n;
1869 }
1870
1871 static int manager_process_notify_fd(Manager *m) {
1872         ssize_t n;
1873
1874         assert(m);
1875
1876         for (;;) {
1877                 char buf[4096];
1878                 struct msghdr msghdr;
1879                 struct iovec iovec;
1880                 struct ucred *ucred;
1881                 union {
1882                         struct cmsghdr cmsghdr;
1883                         uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1884                 } control;
1885                 Unit *u;
1886                 char **tags;
1887
1888                 zero(iovec);
1889                 iovec.iov_base = buf;
1890                 iovec.iov_len = sizeof(buf)-1;
1891
1892                 zero(control);
1893                 zero(msghdr);
1894                 msghdr.msg_iov = &iovec;
1895                 msghdr.msg_iovlen = 1;
1896                 msghdr.msg_control = &control;
1897                 msghdr.msg_controllen = sizeof(control);
1898
1899                 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1900                         if (n >= 0)
1901                                 return -EIO;
1902
1903                         if (errno == EAGAIN || errno == EINTR)
1904                                 break;
1905
1906                         return -errno;
1907                 }
1908
1909                 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1910                     control.cmsghdr.cmsg_level != SOL_SOCKET ||
1911                     control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1912                     control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1913                         log_warning("Received notify message without credentials. Ignoring.");
1914                         continue;
1915                 }
1916
1917                 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1918
1919                 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(ucred->pid))))
1920                         if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1921                                 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1922                                 continue;
1923                         }
1924
1925                 assert((size_t) n < sizeof(buf));
1926                 buf[n] = 0;
1927                 if (!(tags = strv_split(buf, "\n\r")))
1928                         return -ENOMEM;
1929
1930                 log_debug("Got notification message for unit %s", u->meta.id);
1931
1932                 if (UNIT_VTABLE(u)->notify_message)
1933                         UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
1934
1935                 strv_free(tags);
1936         }
1937
1938         return 0;
1939 }
1940
1941 static int manager_dispatch_sigchld(Manager *m) {
1942         assert(m);
1943
1944         for (;;) {
1945                 siginfo_t si;
1946                 Unit *u;
1947                 int r;
1948
1949                 zero(si);
1950
1951                 /* First we call waitd() for a PID and do not reap the
1952                  * zombie. That way we can still access /proc/$PID for
1953                  * it while it is a zombie. */
1954                 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1955
1956                         if (errno == ECHILD)
1957                                 break;
1958
1959                         if (errno == EINTR)
1960                                 continue;
1961
1962                         return -errno;
1963                 }
1964
1965                 if (si.si_pid <= 0)
1966                         break;
1967
1968                 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
1969                         char *name = NULL;
1970
1971                         get_process_name(si.si_pid, &name);
1972                         log_debug("Got SIGCHLD for process %lu (%s)", (unsigned long) si.si_pid, strna(name));
1973                         free(name);
1974                 }
1975
1976                 /* Let's flush any message the dying child might still
1977                  * have queued for us. This ensures that the process
1978                  * still exists in /proc so that we can figure out
1979                  * which cgroup and hence unit it belongs to. */
1980                 if ((r = manager_process_notify_fd(m)) < 0)
1981                         return r;
1982
1983                 /* And now figure out the unit this belongs to */
1984                 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(si.si_pid))))
1985                         u = cgroup_unit_by_pid(m, si.si_pid);
1986
1987                 /* And now, we actually reap the zombie. */
1988                 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
1989                         if (errno == EINTR)
1990                                 continue;
1991
1992                         return -errno;
1993                 }
1994
1995                 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
1996                         continue;
1997
1998                 log_debug("Child %lu died (code=%s, status=%i/%s)",
1999                           (long unsigned) si.si_pid,
2000                           sigchld_code_to_string(si.si_code),
2001                           si.si_status,
2002                           strna(si.si_code == CLD_EXITED
2003                                 ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
2004                                 : signal_to_string(si.si_status)));
2005
2006                 if (!u)
2007                         continue;
2008
2009                 log_debug("Child %lu belongs to %s", (long unsigned) si.si_pid, u->meta.id);
2010
2011                 hashmap_remove(m->watch_pids, LONG_TO_PTR(si.si_pid));
2012                 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
2013         }
2014
2015         return 0;
2016 }
2017
2018 static int manager_start_target(Manager *m, const char *name, JobMode mode) {
2019         int r;
2020         DBusError error;
2021
2022         dbus_error_init(&error);
2023
2024         log_debug("Activating special unit %s", name);
2025
2026         if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL)) < 0)
2027                 log_error("Failed to enqueue %s job: %s", name, bus_error(&error, r));
2028
2029         dbus_error_free(&error);
2030
2031         return r;
2032 }
2033
2034 static int manager_process_signal_fd(Manager *m) {
2035         ssize_t n;
2036         struct signalfd_siginfo sfsi;
2037         bool sigchld = false;
2038
2039         assert(m);
2040
2041         for (;;) {
2042                 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
2043
2044                         if (n >= 0)
2045                                 return -EIO;
2046
2047                         if (errno == EINTR || errno == EAGAIN)
2048                                 break;
2049
2050                         return -errno;
2051                 }
2052
2053                 log_debug("Received SIG%s", strna(signal_to_string(sfsi.ssi_signo)));
2054
2055                 switch (sfsi.ssi_signo) {
2056
2057                 case SIGCHLD:
2058                         sigchld = true;
2059                         break;
2060
2061                 case SIGTERM:
2062                         if (m->running_as == MANAGER_SYSTEM) {
2063                                 /* This is for compatibility with the
2064                                  * original sysvinit */
2065                                 m->exit_code = MANAGER_REEXECUTE;
2066                                 break;
2067                         }
2068
2069                         /* Fall through */
2070
2071                 case SIGINT:
2072                         if (m->running_as == MANAGER_SYSTEM) {
2073                                 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
2074                                 break;
2075                         }
2076
2077                         /* Run the exit target if there is one, if not, just exit. */
2078                         if (manager_start_target(m, SPECIAL_EXIT_TARGET, JOB_REPLACE) < 0) {
2079                                 m->exit_code = MANAGER_EXIT;
2080                                 return 0;
2081                         }
2082
2083                         break;
2084
2085                 case SIGWINCH:
2086                         if (m->running_as == MANAGER_SYSTEM)
2087                                 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
2088
2089                         /* This is a nop on non-init */
2090                         break;
2091
2092                 case SIGPWR:
2093                         if (m->running_as == MANAGER_SYSTEM)
2094                                 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
2095
2096                         /* This is a nop on non-init */
2097                         break;
2098
2099                 case SIGUSR1: {
2100                         Unit *u;
2101
2102                         u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
2103
2104                         if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
2105                                 log_info("Trying to reconnect to bus...");
2106                                 bus_init(m, true);
2107                         }
2108
2109                         if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
2110                                 log_info("Loading D-Bus service...");
2111                                 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
2112                         }
2113
2114                         break;
2115                 }
2116
2117                 case SIGUSR2: {
2118                         FILE *f;
2119                         char *dump = NULL;
2120                         size_t size;
2121
2122                         if (!(f = open_memstream(&dump, &size))) {
2123                                 log_warning("Failed to allocate memory stream.");
2124                                 break;
2125                         }
2126
2127                         manager_dump_units(m, f, "\t");
2128                         manager_dump_jobs(m, f, "\t");
2129
2130                         if (ferror(f)) {
2131                                 fclose(f);
2132                                 free(dump);
2133                                 log_warning("Failed to write status stream");
2134                                 break;
2135                         }
2136
2137                         fclose(f);
2138                         log_dump(LOG_INFO, dump);
2139                         free(dump);
2140
2141                         break;
2142                 }
2143
2144                 case SIGHUP:
2145                         m->exit_code = MANAGER_RELOAD;
2146                         break;
2147
2148                 default: {
2149                         /* Starting SIGRTMIN+0 */
2150                         static const char * const target_table[] = {
2151                                 [0] = SPECIAL_DEFAULT_TARGET,
2152                                 [1] = SPECIAL_RESCUE_TARGET,
2153                                 [2] = SPECIAL_EMERGENCY_TARGET,
2154                                 [3] = SPECIAL_HALT_TARGET,
2155                                 [4] = SPECIAL_POWEROFF_TARGET,
2156                                 [5] = SPECIAL_REBOOT_TARGET,
2157                                 [6] = SPECIAL_KEXEC_TARGET
2158                         };
2159
2160                         /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
2161                         static const ManagerExitCode code_table[] = {
2162                                 [0] = MANAGER_HALT,
2163                                 [1] = MANAGER_POWEROFF,
2164                                 [2] = MANAGER_REBOOT,
2165                                 [3] = MANAGER_KEXEC
2166                         };
2167
2168                         if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
2169                             (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
2170                                 manager_start_target(m, target_table[sfsi.ssi_signo - SIGRTMIN],
2171                                                      (sfsi.ssi_signo == 1 || sfsi.ssi_signo == 2) ? JOB_ISOLATE : JOB_REPLACE);
2172                                 break;
2173                         }
2174
2175                         if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
2176                             (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(code_table)) {
2177                                 m->exit_code = code_table[sfsi.ssi_signo - SIGRTMIN - 13];
2178                                 break;
2179                         }
2180
2181                         switch (sfsi.ssi_signo - SIGRTMIN) {
2182
2183                         case 20:
2184                                 log_debug("Enabling showing of status.");
2185                                 m->show_status = true;
2186                                 break;
2187
2188                         case 21:
2189                                 log_debug("Disabling showing of status.");
2190                                 m->show_status = false;
2191                                 break;
2192
2193                         default:
2194                                 log_warning("Got unhandled signal <%s>.", strna(signal_to_string(sfsi.ssi_signo)));
2195                         }
2196                 }
2197                 }
2198         }
2199
2200         if (sigchld)
2201                 return manager_dispatch_sigchld(m);
2202
2203         return 0;
2204 }
2205
2206 static int process_event(Manager *m, struct epoll_event *ev) {
2207         int r;
2208         Watch *w;
2209
2210         assert(m);
2211         assert(ev);
2212
2213         assert(w = ev->data.ptr);
2214
2215         if (w->type == WATCH_INVALID)
2216                 return 0;
2217
2218         switch (w->type) {
2219
2220         case WATCH_SIGNAL:
2221
2222                 /* An incoming signal? */
2223                 if (ev->events != EPOLLIN)
2224                         return -EINVAL;
2225
2226                 if ((r = manager_process_signal_fd(m)) < 0)
2227                         return r;
2228
2229                 break;
2230
2231         case WATCH_NOTIFY:
2232
2233                 /* An incoming daemon notification event? */
2234                 if (ev->events != EPOLLIN)
2235                         return -EINVAL;
2236
2237                 if ((r = manager_process_notify_fd(m)) < 0)
2238                         return r;
2239
2240                 break;
2241
2242         case WATCH_FD:
2243
2244                 /* Some fd event, to be dispatched to the units */
2245                 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
2246                 break;
2247
2248         case WATCH_UNIT_TIMER:
2249         case WATCH_JOB_TIMER: {
2250                 uint64_t v;
2251                 ssize_t k;
2252
2253                 /* Some timer event, to be dispatched to the units */
2254                 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
2255
2256                         if (k < 0 && (errno == EINTR || errno == EAGAIN))
2257                                 break;
2258
2259                         return k < 0 ? -errno : -EIO;
2260                 }
2261
2262                 if (w->type == WATCH_UNIT_TIMER)
2263                         UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
2264                 else
2265                         job_timer_event(w->data.job, v, w);
2266                 break;
2267         }
2268
2269         case WATCH_MOUNT:
2270                 /* Some mount table change, intended for the mount subsystem */
2271                 mount_fd_event(m, ev->events);
2272                 break;
2273
2274         case WATCH_SWAP:
2275                 /* Some swap table change, intended for the swap subsystem */
2276                 swap_fd_event(m, ev->events);
2277                 break;
2278
2279         case WATCH_UDEV:
2280                 /* Some notification from udev, intended for the device subsystem */
2281                 device_fd_event(m, ev->events);
2282                 break;
2283
2284         case WATCH_DBUS_WATCH:
2285                 bus_watch_event(m, w, ev->events);
2286                 break;
2287
2288         case WATCH_DBUS_TIMEOUT:
2289                 bus_timeout_event(m, w, ev->events);
2290                 break;
2291
2292         default:
2293                 log_error("event type=%i", w->type);
2294                 assert_not_reached("Unknown epoll event type.");
2295         }
2296
2297         return 0;
2298 }
2299
2300 int manager_loop(Manager *m) {
2301         int r;
2302
2303         RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
2304
2305         assert(m);
2306         m->exit_code = MANAGER_RUNNING;
2307
2308         /* Release the path cache */
2309         set_free_free(m->unit_path_cache);
2310         m->unit_path_cache = NULL;
2311
2312         manager_check_finished(m);
2313
2314         /* There might still be some zombies hanging around from
2315          * before we were exec()'ed. Leat's reap them */
2316         if ((r = manager_dispatch_sigchld(m)) < 0)
2317                 return r;
2318
2319         while (m->exit_code == MANAGER_RUNNING) {
2320                 struct epoll_event event;
2321                 int n;
2322
2323                 if (!ratelimit_test(&rl)) {
2324                         /* Yay, something is going seriously wrong, pause a little */
2325                         log_warning("Looping too fast. Throttling execution a little.");
2326                         sleep(1);
2327                 }
2328
2329                 if (manager_dispatch_load_queue(m) > 0)
2330                         continue;
2331
2332                 if (manager_dispatch_run_queue(m) > 0)
2333                         continue;
2334
2335                 if (bus_dispatch(m) > 0)
2336                         continue;
2337
2338                 if (manager_dispatch_cleanup_queue(m) > 0)
2339                         continue;
2340
2341                 if (manager_dispatch_gc_queue(m) > 0)
2342                         continue;
2343
2344                 if (manager_dispatch_dbus_queue(m) > 0)
2345                         continue;
2346
2347                 if (swap_dispatch_reload(m) > 0)
2348                         continue;
2349
2350                 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2351
2352                         if (errno == EINTR)
2353                                 continue;
2354
2355                         return -errno;
2356                 }
2357
2358                 assert(n == 1);
2359
2360                 if ((r = process_event(m, &event)) < 0)
2361                         return r;
2362         }
2363
2364         return m->exit_code;
2365 }
2366
2367 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2368         char *n;
2369         Unit *u;
2370
2371         assert(m);
2372         assert(s);
2373         assert(_u);
2374
2375         if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2376                 return -EINVAL;
2377
2378         if (!(n = bus_path_unescape(s+31)))
2379                 return -ENOMEM;
2380
2381         u = manager_get_unit(m, n);
2382         free(n);
2383
2384         if (!u)
2385                 return -ENOENT;
2386
2387         *_u = u;
2388
2389         return 0;
2390 }
2391
2392 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2393         Job *j;
2394         unsigned id;
2395         int r;
2396
2397         assert(m);
2398         assert(s);
2399         assert(_j);
2400
2401         if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2402                 return -EINVAL;
2403
2404         if ((r = safe_atou(s + 30, &id)) < 0)
2405                 return r;
2406
2407         if (!(j = manager_get_job(m, id)))
2408                 return -ENOENT;
2409
2410         *_j = j;
2411
2412         return 0;
2413 }
2414
2415 void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
2416
2417 #ifdef HAVE_AUDIT
2418         char *p;
2419
2420         if (m->audit_fd < 0)
2421                 return;
2422
2423         /* Don't generate audit events if the service was already
2424          * started and we're just deserializing */
2425         if (m->n_deserializing > 0)
2426                 return;
2427
2428         if (!(p = unit_name_to_prefix_and_instance(u->meta.id))) {
2429                 log_error("Failed to allocate unit name for audit message: %s", strerror(ENOMEM));
2430                 return;
2431         }
2432
2433         if (audit_log_user_comm_message(m->audit_fd, type, "", p, NULL, NULL, NULL, success) < 0)
2434                 log_error("Failed to send audit message: %m");
2435
2436         free(p);
2437 #endif
2438
2439 }
2440
2441 void manager_send_unit_plymouth(Manager *m, Unit *u) {
2442         int fd = -1;
2443         union sockaddr_union sa;
2444         int n = 0;
2445         char *message = NULL;
2446
2447         /* Don't generate plymouth events if the service was already
2448          * started and we're just deserializing */
2449         if (m->n_deserializing > 0)
2450                 return;
2451
2452         if (m->running_as != MANAGER_SYSTEM)
2453                 return;
2454
2455         if (u->meta.type != UNIT_SERVICE &&
2456             u->meta.type != UNIT_MOUNT &&
2457             u->meta.type != UNIT_SWAP)
2458                 return;
2459
2460         /* We set SOCK_NONBLOCK here so that we rather drop the
2461          * message then wait for plymouth */
2462         if ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
2463                 log_error("socket() failed: %m");
2464                 return;
2465         }
2466
2467         zero(sa);
2468         sa.sa.sa_family = AF_UNIX;
2469         strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
2470         if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
2471
2472                 if (errno != EPIPE &&
2473                     errno != EAGAIN &&
2474                     errno != ENOENT &&
2475                     errno != ECONNREFUSED &&
2476                     errno != ECONNRESET &&
2477                     errno != ECONNABORTED)
2478                         log_error("connect() failed: %m");
2479
2480                 goto finish;
2481         }
2482
2483         if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->meta.id) + 1), u->meta.id, &n) < 0) {
2484                 log_error("Out of memory");
2485                 goto finish;
2486         }
2487
2488         errno = 0;
2489         if (write(fd, message, n + 1) != n + 1) {
2490
2491                 if (errno != EPIPE &&
2492                     errno != EAGAIN &&
2493                     errno != ENOENT &&
2494                     errno != ECONNREFUSED &&
2495                     errno != ECONNRESET &&
2496                     errno != ECONNABORTED)
2497                         log_error("Failed to write Plymouth message: %m");
2498
2499                 goto finish;
2500         }
2501
2502 finish:
2503         if (fd >= 0)
2504                 close_nointr_nofail(fd);
2505
2506         free(message);
2507 }
2508
2509 void manager_dispatch_bus_name_owner_changed(
2510                 Manager *m,
2511                 const char *name,
2512                 const char* old_owner,
2513                 const char *new_owner) {
2514
2515         Unit *u;
2516
2517         assert(m);
2518         assert(name);
2519
2520         if (!(u = hashmap_get(m->watch_bus, name)))
2521                 return;
2522
2523         UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2524 }
2525
2526 void manager_dispatch_bus_query_pid_done(
2527                 Manager *m,
2528                 const char *name,
2529                 pid_t pid) {
2530
2531         Unit *u;
2532
2533         assert(m);
2534         assert(name);
2535         assert(pid >= 1);
2536
2537         if (!(u = hashmap_get(m->watch_bus, name)))
2538                 return;
2539
2540         UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2541 }
2542
2543 int manager_open_serialization(Manager *m, FILE **_f) {
2544         char *path;
2545         mode_t saved_umask;
2546         int fd;
2547         FILE *f;
2548
2549         assert(_f);
2550
2551         if (m->running_as == MANAGER_SYSTEM) {
2552                 mkdir_p("/dev/.systemd", 0755);
2553
2554                 if (asprintf(&path, "/dev/.systemd/dump-%lu-XXXXXX", (unsigned long) getpid()) < 0)
2555                         return -ENOMEM;
2556         } else {
2557                 if (asprintf(&path, "/tmp/systemd-dump-%lu-XXXXXX", (unsigned long) getpid()) < 0)
2558                         return -ENOMEM;
2559         }
2560
2561         saved_umask = umask(0077);
2562         fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2563         umask(saved_umask);
2564
2565         if (fd < 0) {
2566                 free(path);
2567                 return -errno;
2568         }
2569
2570         unlink(path);
2571
2572         log_debug("Serializing state to %s", path);
2573         free(path);
2574
2575         if (!(f = fdopen(fd, "w+")) < 0)
2576                 return -errno;
2577
2578         *_f = f;
2579
2580         return 0;
2581 }
2582
2583 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2584         Iterator i;
2585         Unit *u;
2586         const char *t;
2587         int r;
2588
2589         assert(m);
2590         assert(f);
2591         assert(fds);
2592
2593         dual_timestamp_serialize(f, "initrd-timestamp", &m->initrd_timestamp);
2594         dual_timestamp_serialize(f, "startup-timestamp", &m->startup_timestamp);
2595         dual_timestamp_serialize(f, "finish-timestamp", &m->finish_timestamp);
2596
2597         fputc('\n', f);
2598
2599         HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2600                 if (u->meta.id != t)
2601                         continue;
2602
2603                 if (!unit_can_serialize(u))
2604                         continue;
2605
2606                 /* Start marker */
2607                 fputs(u->meta.id, f);
2608                 fputc('\n', f);
2609
2610                 if ((r = unit_serialize(u, f, fds)) < 0)
2611                         return r;
2612         }
2613
2614         if (ferror(f))
2615                 return -EIO;
2616
2617         return 0;
2618 }
2619
2620 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2621         int r = 0;
2622
2623         assert(m);
2624         assert(f);
2625
2626         log_debug("Deserializing state...");
2627
2628         m->n_deserializing ++;
2629
2630         for (;;) {
2631                 char line[1024], *l;
2632
2633                 if (!fgets(line, sizeof(line), f)) {
2634                         if (feof(f))
2635                                 r = 0;
2636                         else
2637                                 r = -errno;
2638
2639                         goto finish;
2640                 }
2641
2642                 char_array_0(line);
2643                 l = strstrip(line);
2644
2645                 if (l[0] == 0)
2646                         break;
2647
2648                 if (startswith(l, "initrd-timestamp="))
2649                         dual_timestamp_deserialize(l+17, &m->initrd_timestamp);
2650                 else if (startswith(l, "startup-timestamp="))
2651                         dual_timestamp_deserialize(l+18, &m->startup_timestamp);
2652                 else if (startswith(l, "finish-timestamp="))
2653                         dual_timestamp_deserialize(l+17, &m->finish_timestamp);
2654                 else
2655                         log_debug("Unknown serialization item '%s'", l);
2656         }
2657
2658         for (;;) {
2659                 Unit *u;
2660                 char name[UNIT_NAME_MAX+2];
2661
2662                 /* Start marker */
2663                 if (!fgets(name, sizeof(name), f)) {
2664                         if (feof(f))
2665                                 r = 0;
2666                         else
2667                                 r = -errno;
2668
2669                         goto finish;
2670                 }
2671
2672                 char_array_0(name);
2673
2674                 if ((r = manager_load_unit(m, strstrip(name), NULL, NULL, &u)) < 0)
2675                         goto finish;
2676
2677                 if ((r = unit_deserialize(u, f, fds)) < 0)
2678                         goto finish;
2679         }
2680
2681 finish:
2682         if (ferror(f)) {
2683                 r = -EIO;
2684                 goto finish;
2685         }
2686
2687         assert(m->n_deserializing > 0);
2688         m->n_deserializing --;
2689
2690         return r;
2691 }
2692
2693 int manager_reload(Manager *m) {
2694         int r, q;
2695         FILE *f;
2696         FDSet *fds;
2697
2698         assert(m);
2699
2700         if ((r = manager_open_serialization(m, &f)) < 0)
2701                 return r;
2702
2703         if (!(fds = fdset_new())) {
2704                 r = -ENOMEM;
2705                 goto finish;
2706         }
2707
2708         if ((r = manager_serialize(m, f, fds)) < 0)
2709                 goto finish;
2710
2711         if (fseeko(f, 0, SEEK_SET) < 0) {
2712                 r = -errno;
2713                 goto finish;
2714         }
2715
2716         /* From here on there is no way back. */
2717         manager_clear_jobs_and_units(m);
2718         manager_undo_generators(m);
2719
2720         /* Find new unit paths */
2721         lookup_paths_free(&m->lookup_paths);
2722         if ((q = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
2723                 r = q;
2724
2725         manager_run_generators(m);
2726
2727         manager_build_unit_path_cache(m);
2728
2729         m->n_deserializing ++;
2730
2731         /* First, enumerate what we can from all config files */
2732         if ((q = manager_enumerate(m)) < 0)
2733                 r = q;
2734
2735         /* Second, deserialize our stored data */
2736         if ((q = manager_deserialize(m, f, fds)) < 0)
2737                 r = q;
2738
2739         fclose(f);
2740         f = NULL;
2741
2742         /* Third, fire things up! */
2743         if ((q = manager_coldplug(m)) < 0)
2744                 r = q;
2745
2746         assert(m->n_deserializing > 0);
2747         m->n_deserializing ++;
2748
2749 finish:
2750         if (f)
2751                 fclose(f);
2752
2753         if (fds)
2754                 fdset_free(fds);
2755
2756         return r;
2757 }
2758
2759 bool manager_is_booting_or_shutting_down(Manager *m) {
2760         Unit *u;
2761
2762         assert(m);
2763
2764         /* Is the initial job still around? */
2765         if (manager_get_job(m, 1))
2766                 return true;
2767
2768         /* Is there a job for the shutdown target? */
2769         if (((u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET))))
2770                 return !!u->meta.job;
2771
2772         return false;
2773 }
2774
2775 void manager_reset_failed(Manager *m) {
2776         Unit *u;
2777         Iterator i;
2778
2779         assert(m);
2780
2781         HASHMAP_FOREACH(u, m->units, i)
2782                 unit_reset_failed(u);
2783 }
2784
2785 bool manager_unit_pending_inactive(Manager *m, const char *name) {
2786         Unit *u;
2787
2788         assert(m);
2789         assert(name);
2790
2791         /* Returns true if the unit is inactive or going down */
2792         if (!(u = manager_get_unit(m, name)))
2793                 return true;
2794
2795         return unit_pending_inactive(u);
2796 }
2797
2798 void manager_check_finished(Manager *m) {
2799         char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX];
2800
2801         assert(m);
2802
2803         if (dual_timestamp_is_set(&m->finish_timestamp))
2804                 return;
2805
2806         if (hashmap_size(m->jobs) > 0)
2807                 return;
2808
2809         dual_timestamp_get(&m->finish_timestamp);
2810
2811         if (m->running_as == MANAGER_SYSTEM) {
2812                 if (dual_timestamp_is_set(&m->initrd_timestamp)) {
2813                         log_info("Startup finished in %s (kernel) + %s (initrd) + %s (userspace) = %s.",
2814                                  format_timespan(kernel, sizeof(kernel),
2815                                                  m->initrd_timestamp.monotonic),
2816                                  format_timespan(initrd, sizeof(initrd),
2817                                                  m->startup_timestamp.monotonic - m->initrd_timestamp.monotonic),
2818                                  format_timespan(userspace, sizeof(userspace),
2819                                                  m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2820                                  format_timespan(sum, sizeof(sum),
2821                                                  m->finish_timestamp.monotonic));
2822                 } else
2823                         log_info("Startup finished in %s (kernel) + %s (userspace) = %s.",
2824                                  format_timespan(kernel, sizeof(kernel),
2825                                                  m->startup_timestamp.monotonic),
2826                                  format_timespan(userspace, sizeof(userspace),
2827                                                  m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2828                                  format_timespan(sum, sizeof(sum),
2829                                                  m->finish_timestamp.monotonic));
2830         } else
2831                 log_debug("Startup finished in %s.",
2832                           format_timespan(userspace, sizeof(userspace),
2833                                           m->finish_timestamp.monotonic - m->startup_timestamp.monotonic));
2834
2835 }
2836
2837 void manager_run_generators(Manager *m) {
2838         DIR *d = NULL;
2839         const char *generator_path;
2840         const char *argv[3];
2841
2842         assert(m);
2843
2844         generator_path = m->running_as == MANAGER_SYSTEM ? SYSTEM_GENERATOR_PATH : USER_GENERATOR_PATH;
2845         if (!(d = opendir(generator_path))) {
2846
2847                 if (errno == ENOENT)
2848                         return;
2849
2850                 log_error("Failed to enumerate generator directory: %m");
2851                 return;
2852         }
2853
2854         if (!m->generator_unit_path) {
2855                 char *p;
2856                 char system_path[] = "/dev/.systemd/generator-XXXXXX",
2857                         user_path[] = "/tmp/systemd-generator-XXXXXX";
2858
2859                 if (!(p = mkdtemp(m->running_as == MANAGER_SYSTEM ? system_path : user_path))) {
2860                         log_error("Failed to generate generator directory: %m");
2861                         goto finish;
2862                 }
2863
2864                 if (!(m->generator_unit_path = strdup(p))) {
2865                         log_error("Failed to allocate generator unit path.");
2866                         goto finish;
2867                 }
2868         }
2869
2870         argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */
2871         argv[1] = m->generator_unit_path;
2872         argv[2] = NULL;
2873
2874         execute_directory(generator_path, d, (char**) argv);
2875
2876         if (rmdir(m->generator_unit_path) >= 0) {
2877                 /* Uh? we were able to remove this dir? I guess that
2878                  * means the directory was empty, hence let's shortcut
2879                  * this */
2880
2881                 free(m->generator_unit_path);
2882                 m->generator_unit_path = NULL;
2883                 goto finish;
2884         }
2885
2886         if (!strv_find(m->lookup_paths.unit_path, m->generator_unit_path)) {
2887                 char **l;
2888
2889                 if (!(l = strv_append(m->lookup_paths.unit_path, m->generator_unit_path))) {
2890                         log_error("Failed to add generator directory to unit search path: %m");
2891                         goto finish;
2892                 }
2893
2894                 strv_free(m->lookup_paths.unit_path);
2895                 m->lookup_paths.unit_path = l;
2896
2897                 log_debug("Added generator unit path %s to search path.", m->generator_unit_path);
2898         }
2899
2900 finish:
2901         if (d)
2902                 closedir(d);
2903 }
2904
2905 void manager_undo_generators(Manager *m) {
2906         assert(m);
2907
2908         if (!m->generator_unit_path)
2909                 return;
2910
2911         strv_remove(m->lookup_paths.unit_path, m->generator_unit_path);
2912         rm_rf(m->generator_unit_path, false, true);
2913
2914         free(m->generator_unit_path);
2915         m->generator_unit_path = NULL;
2916 }
2917
2918 int manager_set_default_controllers(Manager *m, char **controllers) {
2919         char **l;
2920
2921         assert(m);
2922
2923         if (!(l = strv_copy(controllers)))
2924                 return -ENOMEM;
2925
2926         strv_free(m->default_controllers);
2927         m->default_controllers = l;
2928
2929         return 0;
2930 }
2931
2932 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
2933         [MANAGER_SYSTEM] = "system",
2934         [MANAGER_USER] = "user"
2935 };
2936
2937 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);