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_SYSTEM "/run/systemd/notify"
  70 #define NOTIFY_SOCKET_USER "@/org/freedesktop/systemd1/notify"
  71
  72 static int manager_setup_notify(Manager *m) {
  73         union {
  74                 struct sockaddr sa;
  75                 struct sockaddr_un un;
  76         } sa;
  77         struct epoll_event ev;
  78         int one = 1;
  79
  80         assert(m);
  81
  82         m->notify_watch.type = WATCH_NOTIFY;
  83         if ((m->notify_watch.fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
  84                 log_error("Failed to allocate notification socket: %m");
  85                 return -errno;
  86         }
  87
  88         zero(sa);
  89         sa.sa.sa_family = AF_UNIX;
  90
  91         if (getpid() != 1)
  92                 snprintf(sa.un.sun_path, sizeof(sa.un.sun_path), NOTIFY_SOCKET_USER "/%llu", random_ull());
  93         else {
  94                 unlink(NOTIFY_SOCKET_SYSTEM);
  95                 strncpy(sa.un.sun_path, NOTIFY_SOCKET_SYSTEM, sizeof(sa.un.sun_path));
  96         }
  97
  98         if (sa.un.sun_path[0] == '@')
  99                 sa.un.sun_path[0] = 0;
 100
 101         if (bind(m->notify_watch.fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
 102                 log_error("bind() failed: %m");
 103                 return -errno;
 104         }
 105
 106         if (setsockopt(m->notify_watch.fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
 107                 log_error("SO_PASSCRED failed: %m");
 108                 return -errno;
 109         }
 110
 111         zero(ev);
 112         ev.events = EPOLLIN;
 113         ev.data.ptr = &m->notify_watch;
 114
 115         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->notify_watch.fd, &ev) < 0)
 116                 return -errno;
 117
 118         if (sa.un.sun_path[0] == 0)
 119                 sa.un.sun_path[0] = '@';
 120
 121         if (!(m->notify_socket = strdup(sa.un.sun_path)))
 122                 return -ENOMEM;
 123
 124         log_debug("Using notification socket %s", m->notify_socket);
 125
 126         return 0;
 127 }
 128
 129 static int enable_special_signals(Manager *m) {
 130         int fd;
 131
 132         assert(m);
 133
 134         /* Enable that we get SIGINT on control-alt-del */
 135         if (reboot(RB_DISABLE_CAD) < 0)
 136                 log_warning("Failed to enable ctrl-alt-del handling: %m");
 137
 138         if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY)) < 0)
 139                 log_warning("Failed to open /dev/tty0: %m");
 140         else {
 141                 /* Enable that we get SIGWINCH on kbrequest */
 142                 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
 143                         log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
 144
 145                 close_nointr_nofail(fd);
 146         }
 147
 148         return 0;
 149 }
 150
 151 static int manager_setup_signals(Manager *m) {
 152         sigset_t mask;
 153         struct epoll_event ev;
 154         struct sigaction sa;
 155
 156         assert(m);
 157
 158         /* We are not interested in SIGSTOP and friends. */
 159         zero(sa);
 160         sa.sa_handler = SIG_DFL;
 161         sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
 162         assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 163
 164         assert_se(sigemptyset(&mask) == 0);
 165
 166         sigset_add_many(&mask,
 167                         SIGCHLD,     /* Child died */
 168                         SIGTERM,     /* Reexecute daemon */
 169                         SIGHUP,      /* Reload configuration */
 170                         SIGUSR1,     /* systemd/upstart: reconnect to D-Bus */
 171                         SIGUSR2,     /* systemd: dump status */
 172                         SIGINT,      /* Kernel sends us this on control-alt-del */
 173                         SIGWINCH,    /* Kernel sends us this on kbrequest (alt-arrowup) */
 174                         SIGPWR,      /* Some kernel drivers and upsd send us this on power failure */
 175                         SIGRTMIN+0,  /* systemd: start default.target */
 176                         SIGRTMIN+1,  /* systemd: isolate rescue.target */
 177                         SIGRTMIN+2,  /* systemd: isolate emergency.target */
 178                         SIGRTMIN+3,  /* systemd: start halt.target */
 179                         SIGRTMIN+4,  /* systemd: start poweroff.target */
 180                         SIGRTMIN+5,  /* systemd: start reboot.target */
 181                         SIGRTMIN+6,  /* systemd: start kexec.target */
 182                         SIGRTMIN+13, /* systemd: Immediate halt */
 183                         SIGRTMIN+14, /* systemd: Immediate poweroff */
 184                         SIGRTMIN+15, /* systemd: Immediate reboot */
 185                         SIGRTMIN+16, /* systemd: Immediate kexec */
 186                         SIGRTMIN+20, /* systemd: enable status messages */
 187                         SIGRTMIN+21, /* systemd: disable status messages */
 188                         -1);
 189         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
 190
 191         m->signal_watch.type = WATCH_SIGNAL;
 192         if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
 193                 return -errno;
 194
 195         zero(ev);
 196         ev.events = EPOLLIN;
 197         ev.data.ptr = &m->signal_watch;
 198
 199         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
 200                 return -errno;
 201
 202         if (m->running_as == MANAGER_SYSTEM)
 203                 return enable_special_signals(m);
 204
 205         return 0;
 206 }
 207
 208 int manager_new(ManagerRunningAs running_as, Manager **_m) {
 209         Manager *m;
 210         int r = -ENOMEM;
 211
 212         assert(_m);
 213         assert(running_as >= 0);
 214         assert(running_as < _MANAGER_RUNNING_AS_MAX);
 215
 216         if (!(m = new0(Manager, 1)))
 217                 return -ENOMEM;
 218
 219         dual_timestamp_get(&m->startup_timestamp);
 220
 221         m->running_as = running_as;
 222         m->name_data_slot = m->subscribed_data_slot = -1;
 223         m->exit_code = _MANAGER_EXIT_CODE_INVALID;
 224         m->pin_cgroupfs_fd = -1;
 225
 226 #ifdef HAVE_AUDIT
 227         m->audit_fd = -1;
 228 #endif
 229
 230         m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = m->swap_watch.fd = -1;
 231         m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
 232
 233         if (!(m->environment = strv_copy(environ)))
 234                 goto fail;
 235
 236         if (!(m->default_controllers = strv_new("cpu", NULL)))
 237                 goto fail;
 238
 239         if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
 240                 goto fail;
 241
 242         if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
 243                 goto fail;
 244
 245         if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
 246                 goto fail;
 247
 248         if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
 249                 goto fail;
 250
 251         if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
 252                 goto fail;
 253
 254         if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
 255                 goto fail;
 256
 257         if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
 258                 goto fail;
 259
 260         if ((r = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
 261                 goto fail;
 262
 263         if ((r = manager_setup_signals(m)) < 0)
 264                 goto fail;
 265
 266         if ((r = manager_setup_cgroup(m)) < 0)
 267                 goto fail;
 268
 269         if ((r = manager_setup_notify(m)) < 0)
 270                 goto fail;
 271
 272         /* Try to connect to the busses, if possible. */
 273         if ((r = bus_init(m, running_as != MANAGER_SYSTEM)) < 0)
 274                 goto fail;
 275
 276 #ifdef HAVE_AUDIT
 277         if ((m->audit_fd = audit_open()) < 0)
 278                 log_error("Failed to connect to audit log: %m");
 279 #endif
 280
 281         m->taint_usr = dir_is_empty("/usr") > 0;
 282
 283         *_m = m;
 284         return 0;
 285
 286 fail:
 287         manager_free(m);
 288         return r;
 289 }
 290
 291 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
 292         Meta *meta;
 293         unsigned n = 0;
 294
 295         assert(m);
 296
 297         while ((meta = m->cleanup_queue)) {
 298                 assert(meta->in_cleanup_queue);
 299
 300                 unit_free((Unit*) meta);
 301                 n++;
 302         }
 303
 304         return n;
 305 }
 306
 307 enum {
 308         GC_OFFSET_IN_PATH,  /* This one is on the path we were traveling */
 309         GC_OFFSET_UNSURE,   /* No clue */
 310         GC_OFFSET_GOOD,     /* We still need this unit */
 311         GC_OFFSET_BAD,      /* We don't need this unit anymore */
 312         _GC_OFFSET_MAX
 313 };
 314
 315 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
 316         Iterator i;
 317         Unit *other;
 318         bool is_bad;
 319
 320         assert(u);
 321
 322         if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
 323             u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
 324             u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
 325                 return;
 326
 327         if (u->meta.in_cleanup_queue)
 328                 goto bad;
 329
 330         if (unit_check_gc(u))
 331                 goto good;
 332
 333         u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
 334
 335         is_bad = true;
 336
 337         SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
 338                 unit_gc_sweep(other, gc_marker);
 339
 340                 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
 341                         goto good;
 342
 343                 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
 344                         is_bad = false;
 345         }
 346
 347         if (is_bad)
 348                 goto bad;
 349
 350         /* We were unable to find anything out about this entry, so
 351          * let's investigate it later */
 352         u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
 353         unit_add_to_gc_queue(u);
 354         return;
 355
 356 bad:
 357         /* We definitely know that this one is not useful anymore, so
 358          * let's mark it for deletion */
 359         u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
 360         unit_add_to_cleanup_queue(u);
 361         return;
 362
 363 good:
 364         u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
 365 }
 366
 367 static unsigned manager_dispatch_gc_queue(Manager *m) {
 368         Meta *meta;
 369         unsigned n = 0;
 370         unsigned gc_marker;
 371
 372         assert(m);
 373
 374         if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
 375             (m->gc_queue_timestamp <= 0 ||
 376              (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
 377                 return 0;
 378
 379         log_debug("Running GC...");
 380
 381         m->gc_marker += _GC_OFFSET_MAX;
 382         if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
 383                 m->gc_marker = 1;
 384
 385         gc_marker = m->gc_marker;
 386
 387         while ((meta = m->gc_queue)) {
 388                 assert(meta->in_gc_queue);
 389
 390                 unit_gc_sweep((Unit*) meta, gc_marker);
 391
 392                 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
 393                 meta->in_gc_queue = false;
 394
 395                 n++;
 396
 397                 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
 398                     meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
 399                         log_debug("Collecting %s", meta->id);
 400                         meta->gc_marker = gc_marker + GC_OFFSET_BAD;
 401                         unit_add_to_cleanup_queue((Unit*) meta);
 402                 }
 403         }
 404
 405         m->n_in_gc_queue = 0;
 406         m->gc_queue_timestamp = 0;
 407
 408         return n;
 409 }
 410
 411 static void manager_clear_jobs_and_units(Manager *m) {
 412         Job *j;
 413         Unit *u;
 414
 415         assert(m);
 416
 417         while ((j = hashmap_first(m->transaction_jobs)))
 418                 job_free(j);
 419
 420         while ((u = hashmap_first(m->units)))
 421                 unit_free(u);
 422
 423         manager_dispatch_cleanup_queue(m);
 424
 425         assert(!m->load_queue);
 426         assert(!m->run_queue);
 427         assert(!m->dbus_unit_queue);
 428         assert(!m->dbus_job_queue);
 429         assert(!m->cleanup_queue);
 430         assert(!m->gc_queue);
 431
 432         assert(hashmap_isempty(m->transaction_jobs));
 433         assert(hashmap_isempty(m->jobs));
 434         assert(hashmap_isempty(m->units));
 435 }
 436
 437 void manager_free(Manager *m) {
 438         UnitType c;
 439
 440         assert(m);
 441
 442         manager_clear_jobs_and_units(m);
 443
 444         for (c = 0; c < _UNIT_TYPE_MAX; c++)
 445                 if (unit_vtable[c]->shutdown)
 446                         unit_vtable[c]->shutdown(m);
 447
 448         /* If we reexecute ourselves, we keep the root cgroup
 449          * around */
 450         manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
 451
 452         manager_undo_generators(m);
 453
 454         bus_done(m);
 455
 456         hashmap_free(m->units);
 457         hashmap_free(m->jobs);
 458         hashmap_free(m->transaction_jobs);
 459         hashmap_free(m->watch_pids);
 460         hashmap_free(m->watch_bus);
 461
 462         if (m->epoll_fd >= 0)
 463                 close_nointr_nofail(m->epoll_fd);
 464         if (m->signal_watch.fd >= 0)
 465                 close_nointr_nofail(m->signal_watch.fd);
 466         if (m->notify_watch.fd >= 0)
 467                 close_nointr_nofail(m->notify_watch.fd);
 468
 469 #ifdef HAVE_AUDIT
 470         if (m->audit_fd >= 0)
 471                 audit_close(m->audit_fd);
 472 #endif
 473
 474         free(m->notify_socket);
 475
 476         lookup_paths_free(&m->lookup_paths);
 477         strv_free(m->environment);
 478
 479         strv_free(m->default_controllers);
 480
 481         hashmap_free(m->cgroup_bondings);
 482         set_free_free(m->unit_path_cache);
 483
 484         free(m);
 485 }
 486
 487 int manager_enumerate(Manager *m) {
 488         int r = 0, q;
 489         UnitType c;
 490
 491         assert(m);
 492
 493         /* Let's ask every type to load all units from disk/kernel
 494          * that it might know */
 495         for (c = 0; c < _UNIT_TYPE_MAX; c++)
 496                 if (unit_vtable[c]->enumerate)
 497                         if ((q = unit_vtable[c]->enumerate(m)) < 0)
 498                                 r = q;
 499
 500         manager_dispatch_load_queue(m);
 501         return r;
 502 }
 503
 504 int manager_coldplug(Manager *m) {
 505         int r = 0, q;
 506         Iterator i;
 507         Unit *u;
 508         char *k;
 509
 510         assert(m);
 511
 512         /* Then, let's set up their initial state. */
 513         HASHMAP_FOREACH_KEY(u, k, m->units, i) {
 514
 515                 /* ignore aliases */
 516                 if (u->meta.id != k)
 517                         continue;
 518
 519                 if ((q = unit_coldplug(u)) < 0)
 520                         r = q;
 521         }
 522
 523         return r;
 524 }
 525
 526 static void manager_build_unit_path_cache(Manager *m) {
 527         char **i;
 528         DIR *d = NULL;
 529         int r;
 530
 531         assert(m);
 532
 533         set_free_free(m->unit_path_cache);
 534
 535         if (!(m->unit_path_cache = set_new(string_hash_func, string_compare_func))) {
 536                 log_error("Failed to allocate unit path cache.");
 537                 return;
 538         }
 539
 540         /* This simply builds a list of files we know exist, so that
 541          * we don't always have to go to disk */
 542
 543         STRV_FOREACH(i, m->lookup_paths.unit_path) {
 544                 struct dirent *de;
 545
 546                 if (!(d = opendir(*i))) {
 547                         log_error("Failed to open directory: %m");
 548                         continue;
 549                 }
 550
 551                 while ((de = readdir(d))) {
 552                         char *p;
 553
 554                         if (ignore_file(de->d_name))
 555                                 continue;
 556
 557                         if (asprintf(&p, "%s/%s", streq(*i, "/") ? "" : *i, de->d_name) < 0) {
 558                                 r = -ENOMEM;
 559                                 goto fail;
 560                         }
 561
 562                         if ((r = set_put(m->unit_path_cache, p)) < 0) {
 563                                 free(p);
 564                                 goto fail;
 565                         }
 566                 }
 567
 568                 closedir(d);
 569                 d = NULL;
 570         }
 571
 572         return;
 573
 574 fail:
 575         log_error("Failed to build unit path cache: %s", strerror(-r));
 576
 577         set_free_free(m->unit_path_cache);
 578         m->unit_path_cache = NULL;
 579
 580         if (d)
 581                 closedir(d);
 582 }
 583
 584 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
 585         int r, q;
 586
 587         assert(m);
 588
 589         manager_run_generators(m);
 590
 591         manager_build_unit_path_cache(m);
 592
 593         /* If we will deserialize make sure that during enumeration
 594          * this is already known, so we increase the counter here
 595          * already */
 596         if (serialization)
 597                 m->n_deserializing ++;
 598
 599         /* First, enumerate what we can from all config files */
 600         r = manager_enumerate(m);
 601
 602         /* Second, deserialize if there is something to deserialize */
 603         if (serialization)
 604                 if ((q = manager_deserialize(m, serialization, fds)) < 0)
 605                         r = q;
 606
 607         /* Third, fire things up! */
 608         if ((q = manager_coldplug(m)) < 0)
 609                 r = q;
 610
 611         if (serialization) {
 612                 assert(m->n_deserializing > 0);
 613                 m->n_deserializing --;
 614         }
 615
 616         return r;
 617 }
 618
 619 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
 620         assert(m);
 621         assert(j);
 622
 623         /* Deletes one job from the transaction */
 624
 625         manager_transaction_unlink_job(m, j, delete_dependencies);
 626
 627         if (!j->installed)
 628                 job_free(j);
 629 }
 630
 631 static void transaction_delete_unit(Manager *m, Unit *u) {
 632         Job *j;
 633
 634         /* Deletes all jobs associated with a certain unit from the
 635          * transaction */
 636
 637         while ((j = hashmap_get(m->transaction_jobs, u)))
 638                 transaction_delete_job(m, j, true);
 639 }
 640
 641 static void transaction_clean_dependencies(Manager *m) {
 642         Iterator i;
 643         Job *j;
 644
 645         assert(m);
 646
 647         /* Drops all dependencies of all installed jobs */
 648
 649         HASHMAP_FOREACH(j, m->jobs, i) {
 650                 while (j->subject_list)
 651                         job_dependency_free(j->subject_list);
 652                 while (j->object_list)
 653                         job_dependency_free(j->object_list);
 654         }
 655
 656         assert(!m->transaction_anchor);
 657 }
 658
 659 static void transaction_abort(Manager *m) {
 660         Job *j;
 661
 662         assert(m);
 663
 664         while ((j = hashmap_first(m->transaction_jobs)))
 665                 if (j->installed)
 666                         transaction_delete_job(m, j, true);
 667                 else
 668                         job_free(j);
 669
 670         assert(hashmap_isempty(m->transaction_jobs));
 671
 672         transaction_clean_dependencies(m);
 673 }
 674
 675 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
 676         JobDependency *l;
 677
 678         assert(m);
 679
 680         /* A recursive sweep through the graph that marks all units
 681          * that matter to the anchor job, i.e. are directly or
 682          * indirectly a dependency of the anchor job via paths that
 683          * are fully marked as mattering. */
 684
 685         if (j)
 686                 l = j->subject_list;
 687         else
 688                 l = m->transaction_anchor;
 689
 690         LIST_FOREACH(subject, l, l) {
 691
 692                 /* This link does not matter */
 693                 if (!l->matters)
 694                         continue;
 695
 696                 /* This unit has already been marked */
 697                 if (l->object->generation == generation)
 698                         continue;
 699
 700                 l->object->matters_to_anchor = true;
 701                 l->object->generation = generation;
 702
 703                 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
 704         }
 705 }
 706
 707 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
 708         JobDependency *l, *last;
 709
 710         assert(j);
 711         assert(other);
 712         assert(j->unit == other->unit);
 713         assert(!j->installed);
 714
 715         /* Merges 'other' into 'j' and then deletes j. */
 716
 717         j->type = t;
 718         j->state = JOB_WAITING;
 719         j->override = j->override || other->override;
 720
 721         j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
 722
 723         /* Patch us in as new owner of the JobDependency objects */
 724         last = NULL;
 725         LIST_FOREACH(subject, l, other->subject_list) {
 726                 assert(l->subject == other);
 727                 l->subject = j;
 728                 last = l;
 729         }
 730
 731         /* Merge both lists */
 732         if (last) {
 733                 last->subject_next = j->subject_list;
 734                 if (j->subject_list)
 735                         j->subject_list->subject_prev = last;
 736                 j->subject_list = other->subject_list;
 737         }
 738
 739         /* Patch us in as new owner of the JobDependency objects */
 740         last = NULL;
 741         LIST_FOREACH(object, l, other->object_list) {
 742                 assert(l->object == other);
 743                 l->object = j;
 744                 last = l;
 745         }
 746
 747         /* Merge both lists */
 748         if (last) {
 749                 last->object_next = j->object_list;
 750                 if (j->object_list)
 751                         j->object_list->object_prev = last;
 752                 j->object_list = other->object_list;
 753         }
 754
 755         /* Kill the other job */
 756         other->subject_list = NULL;
 757         other->object_list = NULL;
 758         transaction_delete_job(m, other, true);
 759 }
 760 static bool job_is_conflicted_by(Job *j) {
 761         JobDependency *l;
 762
 763         assert(j);
 764
 765         /* Returns true if this job is pulled in by a least one
 766          * ConflictedBy dependency. */
 767
 768         LIST_FOREACH(object, l, j->object_list)
 769                 if (l->conflicts)
 770                         return true;
 771
 772         return false;
 773 }
 774
 775 static int delete_one_unmergeable_job(Manager *m, Job *j) {
 776         Job *k;
 777
 778         assert(j);
 779
 780         /* Tries to delete one item in the linked list
 781          * j->transaction_next->transaction_next->... that conflicts
 782          * with another one, in an attempt to make an inconsistent
 783          * transaction work. */
 784
 785         /* We rely here on the fact that if a merged with b does not
 786          * merge with c, either a or b merge with c neither */
 787         LIST_FOREACH(transaction, j, j)
 788                 LIST_FOREACH(transaction, k, j->transaction_next) {
 789                         Job *d;
 790
 791                         /* Is this one mergeable? Then skip it */
 792                         if (job_type_is_mergeable(j->type, k->type))
 793                                 continue;
 794
 795                         /* Ok, we found two that conflict, let's see if we can
 796                          * drop one of them */
 797                         if (!j->matters_to_anchor && !k->matters_to_anchor) {
 798
 799                                 /* Both jobs don't matter, so let's
 800                                  * find the one that is smarter to
 801                                  * remove. Let's think positive and
 802                                  * rather remove stops then starts --
 803                                  * except if something is being
 804                                  * stopped because it is conflicted by
 805                                  * another unit in which case we
 806                                  * rather remove the start. */
 807
 808                                 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)));
 809                                 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)));
 810
 811                                 if (j->type == JOB_STOP) {
 812
 813                                         if (job_is_conflicted_by(j))
 814                                                 d = k;
 815                                         else
 816                                                 d = j;
 817
 818                                 } else if (k->type == JOB_STOP) {
 819
 820                                         if (job_is_conflicted_by(k))
 821                                                 d = j;
 822                                         else
 823                                                 d = k;
 824                                 } else
 825                                         d = j;
 826
 827                         } else if (!j->matters_to_anchor)
 828                                 d = j;
 829                         else if (!k->matters_to_anchor)
 830                                 d = k;
 831                         else
 832                                 return -ENOEXEC;
 833
 834                         /* Ok, we can drop one, so let's do so. */
 835                         log_debug("Fixing conflicting jobs by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
 836                         transaction_delete_job(m, d, true);
 837                         return 0;
 838                 }
 839
 840         return -EINVAL;
 841 }
 842
 843 static int transaction_merge_jobs(Manager *m, DBusError *e) {
 844         Job *j;
 845         Iterator i;
 846         int r;
 847
 848         assert(m);
 849
 850         /* First step, check whether any of the jobs for one specific
 851          * task conflict. If so, try to drop one of them. */
 852         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 853                 JobType t;
 854                 Job *k;
 855
 856                 t = j->type;
 857                 LIST_FOREACH(transaction, k, j->transaction_next) {
 858                         if (job_type_merge(&t, k->type) >= 0)
 859                                 continue;
 860
 861                         /* OK, we could not merge all jobs for this
 862                          * action. Let's see if we can get rid of one
 863                          * of them */
 864
 865                         if ((r = delete_one_unmergeable_job(m, j)) >= 0)
 866                                 /* Ok, we managed to drop one, now
 867                                  * let's ask our callers to call us
 868                                  * again after garbage collecting */
 869                                 return -EAGAIN;
 870
 871                         /* We couldn't merge anything. Failure */
 872                         dbus_set_error(e, BUS_ERROR_TRANSACTION_JOBS_CONFLICTING, "Transaction contains conflicting jobs '%s' and '%s' for %s. Probably contradicting requirement dependencies configured.",
 873                                        job_type_to_string(t), job_type_to_string(k->type), k->unit->meta.id);
 874                         return r;
 875                 }
 876         }
 877
 878         /* Second step, merge the jobs. */
 879         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 880                 JobType t = j->type;
 881                 Job *k;
 882
 883                 /* Merge all transactions */
 884                 LIST_FOREACH(transaction, k, j->transaction_next)
 885                         assert_se(job_type_merge(&t, k->type) == 0);
 886
 887                 /* If an active job is mergeable, merge it too */
 888                 if (j->unit->meta.job)
 889                         job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
 890
 891                 while ((k = j->transaction_next)) {
 892                         if (j->installed) {
 893                                 transaction_merge_and_delete_job(m, k, j, t);
 894                                 j = k;
 895                         } else
 896                                 transaction_merge_and_delete_job(m, j, k, t);
 897                 }
 898
 899                 assert(!j->transaction_next);
 900                 assert(!j->transaction_prev);
 901         }
 902
 903         return 0;
 904 }
 905
 906 static void transaction_drop_redundant(Manager *m) {
 907         bool again;
 908
 909         assert(m);
 910
 911         /* Goes through the transaction and removes all jobs that are
 912          * a noop */
 913
 914         do {
 915                 Job *j;
 916                 Iterator i;
 917
 918                 again = false;
 919
 920                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 921                         bool changes_something = false;
 922                         Job *k;
 923
 924                         LIST_FOREACH(transaction, k, j) {
 925
 926                                 if (!job_is_anchor(k) &&
 927                                     (k->installed || job_type_is_redundant(k->type, unit_active_state(k->unit))) &&
 928                                     (!k->unit->meta.job || !job_type_is_conflicting(k->type, k->unit->meta.job->type)))
 929                                         continue;
 930
 931                                 changes_something = true;
 932                                 break;
 933                         }
 934
 935                         if (changes_something)
 936                                 continue;
 937
 938                         /* log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type)); */
 939                         transaction_delete_job(m, j, false);
 940                         again = true;
 941                         break;
 942                 }
 943
 944         } while (again);
 945 }
 946
 947 static bool unit_matters_to_anchor(Unit *u, Job *j) {
 948         assert(u);
 949         assert(!j->transaction_prev);
 950
 951         /* Checks whether at least one of the jobs for this unit
 952          * matters to the anchor. */
 953
 954         LIST_FOREACH(transaction, j, j)
 955                 if (j->matters_to_anchor)
 956                         return true;
 957
 958         return false;
 959 }
 960
 961 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation, DBusError *e) {
 962         Iterator i;
 963         Unit *u;
 964         int r;
 965
 966         assert(m);
 967         assert(j);
 968         assert(!j->transaction_prev);
 969
 970         /* Does a recursive sweep through the ordering graph, looking
 971          * for a cycle. If we find cycle we try to break it. */
 972
 973         /* Have we seen this before? */
 974         if (j->generation == generation) {
 975                 Job *k, *delete;
 976
 977                 /* If the marker is NULL we have been here already and
 978                  * decided the job was loop-free from here. Hence
 979                  * shortcut things and return right-away. */
 980                 if (!j->marker)
 981                         return 0;
 982
 983                 /* So, the marker is not NULL and we already have been
 984                  * here. We have a cycle. Let's try to break it. We go
 985                  * backwards in our path and try to find a suitable
 986                  * job to remove. We use the marker to find our way
 987                  * back, since smart how we are we stored our way back
 988                  * in there. */
 989                 log_warning("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
 990
 991                 delete = NULL;
 992                 for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
 993
 994                         log_info("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
 995
 996                         if (!delete &&
 997                             !k->installed &&
 998                             !unit_matters_to_anchor(k->unit, k)) {
 999                                 /* Ok, we can drop this one, so let's
1000                                  * do so. */
1001                                 delete = k;
1002                         }
1003
1004                         /* Check if this in fact was the beginning of
1005                          * the cycle */
1006                         if (k == j)
1007                                 break;
1008                 }
1009
1010
1011                 if (delete) {
1012                         log_warning("Breaking ordering cycle by deleting job %s/%s", delete->unit->meta.id, job_type_to_string(delete->type));
1013                         transaction_delete_unit(m, delete->unit);
1014                         return -EAGAIN;
1015                 }
1016
1017                 log_error("Unable to break cycle");
1018
1019                 dbus_set_error(e, BUS_ERROR_TRANSACTION_ORDER_IS_CYCLIC, "Transaction order is cyclic. See system logs for details.");
1020                 return -ENOEXEC;
1021         }
1022
1023         /* Make the marker point to where we come from, so that we can
1024          * find our way backwards if we want to break a cycle. We use
1025          * a special marker for the beginning: we point to
1026          * ourselves. */
1027         j->marker = from ? from : j;
1028         j->generation = generation;
1029
1030         /* We assume that the the dependencies are bidirectional, and
1031          * hence can ignore UNIT_AFTER */
1032         SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
1033                 Job *o;
1034
1035                 /* Is there a job for this unit? */
1036                 if (!(o = hashmap_get(m->transaction_jobs, u)))
1037
1038                         /* Ok, there is no job for this in the
1039                          * transaction, but maybe there is already one
1040                          * running? */
1041                         if (!(o = u->meta.job))
1042                                 continue;
1043
1044                 if ((r = transaction_verify_order_one(m, o, j, generation, e)) < 0)
1045                         return r;
1046         }
1047
1048         /* Ok, let's backtrack, and remember that this entry is not on
1049          * our path anymore. */
1050         j->marker = NULL;
1051
1052         return 0;
1053 }
1054
1055 static int transaction_verify_order(Manager *m, unsigned *generation, DBusError *e) {
1056         Job *j;
1057         int r;
1058         Iterator i;
1059         unsigned g;
1060
1061         assert(m);
1062         assert(generation);
1063
1064         /* Check if the ordering graph is cyclic. If it is, try to fix
1065          * that up by dropping one of the jobs. */
1066
1067         g = (*generation)++;
1068
1069         HASHMAP_FOREACH(j, m->transaction_jobs, i)
1070                 if ((r = transaction_verify_order_one(m, j, NULL, g, e)) < 0)
1071                         return r;
1072
1073         return 0;
1074 }
1075
1076 static void transaction_collect_garbage(Manager *m) {
1077         bool again;
1078
1079         assert(m);
1080
1081         /* Drop jobs that are not required by any other job */
1082
1083         do {
1084                 Iterator i;
1085                 Job *j;
1086
1087                 again = false;
1088
1089                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1090                         if (j->object_list) {
1091                                 /* log_debug("Keeping job %s/%s because of %s/%s", */
1092                                 /*           j->unit->meta.id, job_type_to_string(j->type), */
1093                                 /*           j->object_list->subject ? j->object_list->subject->unit->meta.id : "root", */
1094                                 /*           j->object_list->subject ? job_type_to_string(j->object_list->subject->type) : "root"); */
1095                                 continue;
1096                         }
1097
1098                         /* log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type)); */
1099                         transaction_delete_job(m, j, true);
1100                         again = true;
1101                         break;
1102                 }
1103
1104         } while (again);
1105 }
1106
1107 static int transaction_is_destructive(Manager *m, DBusError *e) {
1108         Iterator i;
1109         Job *j;
1110
1111         assert(m);
1112
1113         /* Checks whether applying this transaction means that
1114          * existing jobs would be replaced */
1115
1116         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1117
1118                 /* Assume merged */
1119                 assert(!j->transaction_prev);
1120                 assert(!j->transaction_next);
1121
1122                 if (j->unit->meta.job &&
1123                     j->unit->meta.job != j &&
1124                     !job_type_is_superset(j->type, j->unit->meta.job->type)) {
1125
1126                         dbus_set_error(e, BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE, "Transaction is destructive.");
1127                         return -EEXIST;
1128                 }
1129         }
1130
1131         return 0;
1132 }
1133
1134 static void transaction_minimize_impact(Manager *m) {
1135         bool again;
1136         assert(m);
1137
1138         /* Drops all unnecessary jobs that reverse already active jobs
1139          * or that stop a running service. */
1140
1141         do {
1142                 Job *j;
1143                 Iterator i;
1144
1145                 again = false;
1146
1147                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1148                         LIST_FOREACH(transaction, j, j) {
1149                                 bool stops_running_service, changes_existing_job;
1150
1151                                 /* If it matters, we shouldn't drop it */
1152                                 if (j->matters_to_anchor)
1153                                         continue;
1154
1155                                 /* Would this stop a running service?
1156                                  * Would this change an existing job?
1157                                  * If so, let's drop this entry */
1158
1159                                 stops_running_service =
1160                                         j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1161
1162                                 changes_existing_job =
1163                                         j->unit->meta.job &&
1164                                         job_type_is_conflicting(j->type, j->unit->meta.job->type);
1165
1166                                 if (!stops_running_service && !changes_existing_job)
1167                                         continue;
1168
1169                                 if (stops_running_service)
1170                                         log_debug("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1171
1172                                 if (changes_existing_job)
1173                                         log_debug("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1174
1175                                 /* Ok, let's get rid of this */
1176                                 log_debug("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1177
1178                                 transaction_delete_job(m, j, true);
1179                                 again = true;
1180                                 break;
1181                         }
1182
1183                         if (again)
1184                                 break;
1185                 }
1186
1187         } while (again);
1188 }
1189
1190 static int transaction_apply(Manager *m, JobMode mode) {
1191         Iterator i;
1192         Job *j;
1193         int r;
1194
1195         /* Moves the transaction jobs to the set of active jobs */
1196
1197         if (mode == JOB_ISOLATE) {
1198
1199                 /* When isolating first kill all installed jobs which
1200                  * aren't part of the new transaction */
1201                 HASHMAP_FOREACH(j, m->jobs, i) {
1202                         assert(j->installed);
1203
1204                         if (hashmap_get(m->transaction_jobs, j->unit))
1205                                 continue;
1206
1207                         job_finish_and_invalidate(j, JOB_CANCELED);
1208                 }
1209         }
1210
1211         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1212                 /* Assume merged */
1213                 assert(!j->transaction_prev);
1214                 assert(!j->transaction_next);
1215
1216                 if (j->installed)
1217                         continue;
1218
1219                 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1220                         goto rollback;
1221         }
1222
1223         while ((j = hashmap_steal_first(m->transaction_jobs))) {
1224                 if (j->installed) {
1225                         /* log_debug("Skipping already installed job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id); */
1226                         continue;
1227                 }
1228
1229                 if (j->unit->meta.job)
1230                         job_free(j->unit->meta.job);
1231
1232                 j->unit->meta.job = j;
1233                 j->installed = true;
1234                 m->n_installed_jobs ++;
1235
1236                 /* We're fully installed. Now let's free data we don't
1237                  * need anymore. */
1238
1239                 assert(!j->transaction_next);
1240                 assert(!j->transaction_prev);
1241
1242                 job_add_to_run_queue(j);
1243                 job_add_to_dbus_queue(j);
1244                 job_start_timer(j);
1245
1246                 log_debug("Installed new job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id);
1247         }
1248
1249         /* As last step, kill all remaining job dependencies. */
1250         transaction_clean_dependencies(m);
1251
1252         return 0;
1253
1254 rollback:
1255
1256         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1257                 if (j->installed)
1258                         continue;
1259
1260                 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1261         }
1262
1263         return r;
1264 }
1265
1266 static int transaction_activate(Manager *m, JobMode mode, DBusError *e) {
1267         int r;
1268         unsigned generation = 1;
1269
1270         assert(m);
1271
1272         /* This applies the changes recorded in transaction_jobs to
1273          * the actual list of jobs, if possible. */
1274
1275         /* First step: figure out which jobs matter */
1276         transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1277
1278         /* Second step: Try not to stop any running services if
1279          * we don't have to. Don't try to reverse running
1280          * jobs if we don't have to. */
1281         if (mode == JOB_FAIL)
1282                 transaction_minimize_impact(m);
1283
1284         /* Third step: Drop redundant jobs */
1285         transaction_drop_redundant(m);
1286
1287         for (;;) {
1288                 /* Fourth step: Let's remove unneeded jobs that might
1289                  * be lurking. */
1290                 if (mode != JOB_ISOLATE)
1291                         transaction_collect_garbage(m);
1292
1293                 /* Fifth step: verify order makes sense and correct
1294                  * cycles if necessary and possible */
1295                 if ((r = transaction_verify_order(m, &generation, e)) >= 0)
1296                         break;
1297
1298                 if (r != -EAGAIN) {
1299                         log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r));
1300                         goto rollback;
1301                 }
1302
1303                 /* Let's see if the resulting transaction ordering
1304                  * graph is still cyclic... */
1305         }
1306
1307         for (;;) {
1308                 /* Sixth step: let's drop unmergeable entries if
1309                  * necessary and possible, merge entries we can
1310                  * merge */
1311                 if ((r = transaction_merge_jobs(m, e)) >= 0)
1312                         break;
1313
1314                 if (r != -EAGAIN) {
1315                         log_warning("Requested transaction contains unmergeable jobs: %s", bus_error(e, r));
1316                         goto rollback;
1317                 }
1318
1319                 /* Seventh step: an entry got dropped, let's garbage
1320                  * collect its dependencies. */
1321                 if (mode != JOB_ISOLATE)
1322                         transaction_collect_garbage(m);
1323
1324                 /* Let's see if the resulting transaction still has
1325                  * unmergeable entries ... */
1326         }
1327
1328         /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1329         transaction_drop_redundant(m);
1330
1331         /* Ninth step: check whether we can actually apply this */
1332         if (mode == JOB_FAIL)
1333                 if ((r = transaction_is_destructive(m, e)) < 0) {
1334                         log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r));
1335                         goto rollback;
1336                 }
1337
1338         /* Tenth step: apply changes */
1339         if ((r = transaction_apply(m, mode)) < 0) {
1340                 log_warning("Failed to apply transaction: %s", strerror(-r));
1341                 goto rollback;
1342         }
1343
1344         assert(hashmap_isempty(m->transaction_jobs));
1345         assert(!m->transaction_anchor);
1346
1347         return 0;
1348
1349 rollback:
1350         transaction_abort(m);
1351         return r;
1352 }
1353
1354 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1355         Job *j, *f;
1356
1357         assert(m);
1358         assert(unit);
1359
1360         /* Looks for an existing prospective job and returns that. If
1361          * it doesn't exist it is created and added to the prospective
1362          * jobs list. */
1363
1364         f = hashmap_get(m->transaction_jobs, unit);
1365
1366         LIST_FOREACH(transaction, j, f) {
1367                 assert(j->unit == unit);
1368
1369                 if (j->type == type) {
1370                         if (is_new)
1371                                 *is_new = false;
1372                         return j;
1373                 }
1374         }
1375
1376         if (unit->meta.job && unit->meta.job->type == type)
1377                 j = unit->meta.job;
1378         else if (!(j = job_new(m, type, unit)))
1379                 return NULL;
1380
1381         j->generation = 0;
1382         j->marker = NULL;
1383         j->matters_to_anchor = false;
1384         j->override = override;
1385
1386         LIST_PREPEND(Job, transaction, f, j);
1387
1388         if (hashmap_replace(m->transaction_jobs, unit, f) < 0) {
1389                 job_free(j);
1390                 return NULL;
1391         }
1392
1393         if (is_new)
1394                 *is_new = true;
1395
1396         /* log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type)); */
1397
1398         return j;
1399 }
1400
1401 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1402         assert(m);
1403         assert(j);
1404
1405         if (j->transaction_prev)
1406                 j->transaction_prev->transaction_next = j->transaction_next;
1407         else if (j->transaction_next)
1408                 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1409         else
1410                 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1411
1412         if (j->transaction_next)
1413                 j->transaction_next->transaction_prev = j->transaction_prev;
1414
1415         j->transaction_prev = j->transaction_next = NULL;
1416
1417         while (j->subject_list)
1418                 job_dependency_free(j->subject_list);
1419
1420         while (j->object_list) {
1421                 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1422
1423                 job_dependency_free(j->object_list);
1424
1425                 if (other && delete_dependencies) {
1426                         log_debug("Deleting job %s/%s as dependency of job %s/%s",
1427                                   other->unit->meta.id, job_type_to_string(other->type),
1428                                   j->unit->meta.id, job_type_to_string(j->type));
1429                         transaction_delete_job(m, other, delete_dependencies);
1430                 }
1431         }
1432 }
1433
1434 static int transaction_add_job_and_dependencies(
1435                 Manager *m,
1436                 JobType type,
1437                 Unit *unit,
1438                 Job *by,
1439                 bool matters,
1440                 bool override,
1441                 bool conflicts,
1442                 bool ignore_requirements,
1443                 bool ignore_order,
1444                 DBusError *e,
1445                 Job **_ret) {
1446         Job *ret;
1447         Iterator i;
1448         Unit *dep;
1449         int r;
1450         bool is_new;
1451
1452         assert(m);
1453         assert(type < _JOB_TYPE_MAX);
1454         assert(unit);
1455
1456         /* log_debug("Pulling in %s/%s from %s/%s", */
1457         /*           unit->meta.id, job_type_to_string(type), */
1458         /*           by ? by->unit->meta.id : "NA", */
1459         /*           by ? job_type_to_string(by->type) : "NA"); */
1460
1461         if (unit->meta.load_state != UNIT_LOADED &&
1462             unit->meta.load_state != UNIT_ERROR &&
1463             unit->meta.load_state != UNIT_MASKED) {
1464                 dbus_set_error(e, BUS_ERROR_LOAD_FAILED, "Unit %s is not loaded properly.", unit->meta.id);
1465                 return -EINVAL;
1466         }
1467
1468         if (type != JOB_STOP && unit->meta.load_state == UNIT_ERROR) {
1469                 dbus_set_error(e, BUS_ERROR_LOAD_FAILED,
1470                                "Unit %s failed to load: %s. "
1471                                "See system logs and 'systemctl status' for details.",
1472                                unit->meta.id,
1473                                strerror(-unit->meta.load_error));
1474                 return -EINVAL;
1475         }
1476
1477         if (type != JOB_STOP && unit->meta.load_state == UNIT_MASKED) {
1478                 dbus_set_error(e, BUS_ERROR_MASKED, "Unit %s is masked.", unit->meta.id);
1479                 return -EINVAL;
1480         }
1481
1482         if (!unit_job_is_applicable(unit, type)) {
1483                 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);
1484                 return -EBADR;
1485         }
1486
1487         /* First add the job. */
1488         if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1489                 return -ENOMEM;
1490
1491         ret->ignore_order = ret->ignore_order || ignore_order;
1492
1493         /* Then, add a link to the job. */
1494         if (!job_dependency_new(by, ret, matters, conflicts))
1495                 return -ENOMEM;
1496
1497         if (is_new && !ignore_requirements) {
1498                 Set *following;
1499
1500                 /* If we are following some other unit, make sure we
1501                  * add all dependencies of everybody following. */
1502                 if (unit_following_set(ret->unit, &following) > 0) {
1503                         SET_FOREACH(dep, following, i)
1504                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
1505                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1506
1507                                         if (e)
1508                                                 dbus_error_free(e);
1509                                 }
1510
1511                         set_free(following);
1512                 }
1513
1514                 /* Finally, recursively add in all dependencies. */
1515                 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1516                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1517                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1518                                         if (r != -EBADR)
1519                                                 goto fail;
1520
1521                                         if (e)
1522                                                 dbus_error_free(e);
1523                                 }
1524
1525                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BIND_TO], i)
1526                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1527
1528                                         if (r != -EBADR)
1529                                                 goto fail;
1530
1531                                         if (e)
1532                                                 dbus_error_free(e);
1533                                 }
1534
1535                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1536                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
1537                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1538
1539                                         if (e)
1540                                                 dbus_error_free(e);
1541                                 }
1542
1543                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1544                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, false, false, ignore_order, e, NULL)) < 0) {
1545                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1546
1547                                         if (e)
1548                                                 dbus_error_free(e);
1549                                 }
1550
1551                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1552                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1553
1554                                         if (r != -EBADR)
1555                                                 goto fail;
1556
1557                                         if (e)
1558                                                 dbus_error_free(e);
1559                                 }
1560
1561                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1562                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
1563                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1564
1565                                         if (e)
1566                                                 dbus_error_free(e);
1567                                 }
1568
1569                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1570                                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, true, false, ignore_order, e, NULL)) < 0) {
1571
1572                                         if (r != -EBADR)
1573                                                 goto fail;
1574
1575                                         if (e)
1576                                                 dbus_error_free(e);
1577                                 }
1578
1579                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTED_BY], i)
1580                                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
1581                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1582
1583                                         if (e)
1584                                                 dbus_error_free(e);
1585                                 }
1586
1587                 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1588
1589                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1590                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1591
1592                                         if (r != -EBADR)
1593                                                 goto fail;
1594
1595                                         if (e)
1596                                                 dbus_error_free(e);
1597                                 }
1598
1599                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BOUND_BY], i)
1600                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1601
1602                                         if (r != -EBADR)
1603                                                 goto fail;
1604
1605                                         if (e)
1606                                                 dbus_error_free(e);
1607                                 }
1608                 }
1609
1610                 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1611         }
1612
1613         if (_ret)
1614                 *_ret = ret;
1615
1616         return 0;
1617
1618 fail:
1619         return r;
1620 }
1621
1622 static int transaction_add_isolate_jobs(Manager *m) {
1623         Iterator i;
1624         Unit *u;
1625         char *k;
1626         int r;
1627
1628         assert(m);
1629
1630         HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1631
1632                 /* ignore aliases */
1633                 if (u->meta.id != k)
1634                         continue;
1635
1636                 if (u->meta.ignore_on_isolate)
1637                         continue;
1638
1639                 /* No need to stop inactive jobs */
1640                 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)) && !u->meta.job)
1641                         continue;
1642
1643                 /* Is there already something listed for this? */
1644                 if (hashmap_get(m->transaction_jobs, u))
1645                         continue;
1646
1647                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, false, false, false, NULL, NULL)) < 0)
1648                         log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1649         }
1650
1651         return 0;
1652 }
1653
1654 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, DBusError *e, Job **_ret) {
1655         int r;
1656         Job *ret;
1657
1658         assert(m);
1659         assert(type < _JOB_TYPE_MAX);
1660         assert(unit);
1661         assert(mode < _JOB_MODE_MAX);
1662
1663         if (mode == JOB_ISOLATE && type != JOB_START) {
1664                 dbus_set_error(e, BUS_ERROR_INVALID_JOB_MODE, "Isolate is only valid for start.");
1665                 return -EINVAL;
1666         }
1667
1668         if (mode == JOB_ISOLATE && !unit->meta.allow_isolate) {
1669                 dbus_set_error(e, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
1670                 return -EPERM;
1671         }
1672
1673         log_debug("Trying to enqueue job %s/%s/%s", unit->meta.id, job_type_to_string(type), job_mode_to_string(mode));
1674
1675         if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, false,
1676                                                       mode == JOB_IGNORE_DEPENDENCIES || mode == JOB_IGNORE_REQUIREMENTS,
1677                                                       mode == JOB_IGNORE_DEPENDENCIES, e, &ret)) < 0) {
1678                 transaction_abort(m);
1679                 return r;
1680         }
1681
1682         if (mode == JOB_ISOLATE)
1683                 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1684                         transaction_abort(m);
1685                         return r;
1686                 }
1687
1688         if ((r = transaction_activate(m, mode, e)) < 0)
1689                 return r;
1690
1691         log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1692
1693         if (_ret)
1694                 *_ret = ret;
1695
1696         return 0;
1697 }
1698
1699 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, DBusError *e, Job **_ret) {
1700         Unit *unit;
1701         int r;
1702
1703         assert(m);
1704         assert(type < _JOB_TYPE_MAX);
1705         assert(name);
1706         assert(mode < _JOB_MODE_MAX);
1707
1708         if ((r = manager_load_unit(m, name, NULL, NULL, &unit)) < 0)
1709                 return r;
1710
1711         return manager_add_job(m, type, unit, mode, override, e, _ret);
1712 }
1713
1714 Job *manager_get_job(Manager *m, uint32_t id) {
1715         assert(m);
1716
1717         return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1718 }
1719
1720 Unit *manager_get_unit(Manager *m, const char *name) {
1721         assert(m);
1722         assert(name);
1723
1724         return hashmap_get(m->units, name);
1725 }
1726
1727 unsigned manager_dispatch_load_queue(Manager *m) {
1728         Meta *meta;
1729         unsigned n = 0;
1730
1731         assert(m);
1732
1733         /* Make sure we are not run recursively */
1734         if (m->dispatching_load_queue)
1735                 return 0;
1736
1737         m->dispatching_load_queue = true;
1738
1739         /* Dispatches the load queue. Takes a unit from the queue and
1740          * tries to load its data until the queue is empty */
1741
1742         while ((meta = m->load_queue)) {
1743                 assert(meta->in_load_queue);
1744
1745                 unit_load((Unit*) meta);
1746                 n++;
1747         }
1748
1749         m->dispatching_load_queue = false;
1750         return n;
1751 }
1752
1753 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1754         Unit *ret;
1755         int r;
1756
1757         assert(m);
1758         assert(name || path);
1759
1760         /* This will prepare the unit for loading, but not actually
1761          * load anything from disk. */
1762
1763         if (path && !is_path(path)) {
1764                 dbus_set_error(e, BUS_ERROR_INVALID_PATH, "Path %s is not absolute.", path);
1765                 return -EINVAL;
1766         }
1767
1768         if (!name)
1769                 name = file_name_from_path(path);
1770
1771         if (!unit_name_is_valid(name, false)) {
1772                 dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
1773                 return -EINVAL;
1774         }
1775
1776         if ((ret = manager_get_unit(m, name))) {
1777                 *_ret = ret;
1778                 return 1;
1779         }
1780
1781         if (!(ret = unit_new(m)))
1782                 return -ENOMEM;
1783
1784         if (path)
1785                 if (!(ret->meta.fragment_path = strdup(path))) {
1786                         unit_free(ret);
1787                         return -ENOMEM;
1788                 }
1789
1790         if ((r = unit_add_name(ret, name)) < 0) {
1791                 unit_free(ret);
1792                 return r;
1793         }
1794
1795         unit_add_to_load_queue(ret);
1796         unit_add_to_dbus_queue(ret);
1797         unit_add_to_gc_queue(ret);
1798
1799         if (_ret)
1800                 *_ret = ret;
1801
1802         return 0;
1803 }
1804
1805 int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1806         int r;
1807
1808         assert(m);
1809
1810         /* This will load the service information files, but not actually
1811          * start any services or anything. */
1812
1813         if ((r = manager_load_unit_prepare(m, name, path, e, _ret)) != 0)
1814                 return r;
1815
1816         manager_dispatch_load_queue(m);
1817
1818         if (_ret)
1819                 *_ret = unit_follow_merge(*_ret);
1820
1821         return 0;
1822 }
1823
1824 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1825         Iterator i;
1826         Job *j;
1827
1828         assert(s);
1829         assert(f);
1830
1831         HASHMAP_FOREACH(j, s->jobs, i)
1832                 job_dump(j, f, prefix);
1833 }
1834
1835 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1836         Iterator i;
1837         Unit *u;
1838         const char *t;
1839
1840         assert(s);
1841         assert(f);
1842
1843         HASHMAP_FOREACH_KEY(u, t, s->units, i)
1844                 if (u->meta.id == t)
1845                         unit_dump(u, f, prefix);
1846 }
1847
1848 void manager_clear_jobs(Manager *m) {
1849         Job *j;
1850
1851         assert(m);
1852
1853         transaction_abort(m);
1854
1855         while ((j = hashmap_first(m->jobs)))
1856                 job_finish_and_invalidate(j, JOB_CANCELED);
1857 }
1858
1859 unsigned manager_dispatch_run_queue(Manager *m) {
1860         Job *j;
1861         unsigned n = 0;
1862
1863         if (m->dispatching_run_queue)
1864                 return 0;
1865
1866         m->dispatching_run_queue = true;
1867
1868         while ((j = m->run_queue)) {
1869                 assert(j->installed);
1870                 assert(j->in_run_queue);
1871
1872                 job_run_and_invalidate(j);
1873                 n++;
1874         }
1875
1876         m->dispatching_run_queue = false;
1877         return n;
1878 }
1879
1880 unsigned manager_dispatch_dbus_queue(Manager *m) {
1881         Job *j;
1882         Meta *meta;
1883         unsigned n = 0;
1884
1885         assert(m);
1886
1887         if (m->dispatching_dbus_queue)
1888                 return 0;
1889
1890         m->dispatching_dbus_queue = true;
1891
1892         while ((meta = m->dbus_unit_queue)) {
1893                 assert(meta->in_dbus_queue);
1894
1895                 bus_unit_send_change_signal((Unit*) meta);
1896                 n++;
1897         }
1898
1899         while ((j = m->dbus_job_queue)) {
1900                 assert(j->in_dbus_queue);
1901
1902                 bus_job_send_change_signal(j);
1903                 n++;
1904         }
1905
1906         m->dispatching_dbus_queue = false;
1907         return n;
1908 }
1909
1910 static int manager_process_notify_fd(Manager *m) {
1911         ssize_t n;
1912
1913         assert(m);
1914
1915         for (;;) {
1916                 char buf[4096];
1917                 struct msghdr msghdr;
1918                 struct iovec iovec;
1919                 struct ucred *ucred;
1920                 union {
1921                         struct cmsghdr cmsghdr;
1922                         uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1923                 } control;
1924                 Unit *u;
1925                 char **tags;
1926
1927                 zero(iovec);
1928                 iovec.iov_base = buf;
1929                 iovec.iov_len = sizeof(buf)-1;
1930
1931                 zero(control);
1932                 zero(msghdr);
1933                 msghdr.msg_iov = &iovec;
1934                 msghdr.msg_iovlen = 1;
1935                 msghdr.msg_control = &control;
1936                 msghdr.msg_controllen = sizeof(control);
1937
1938                 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1939                         if (n >= 0)
1940                                 return -EIO;
1941
1942                         if (errno == EAGAIN || errno == EINTR)
1943                                 break;
1944
1945                         return -errno;
1946                 }
1947
1948                 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1949                     control.cmsghdr.cmsg_level != SOL_SOCKET ||
1950                     control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1951                     control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1952                         log_warning("Received notify message without credentials. Ignoring.");
1953                         continue;
1954                 }
1955
1956                 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1957
1958                 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(ucred->pid))))
1959                         if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1960                                 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1961                                 continue;
1962                         }
1963
1964                 assert((size_t) n < sizeof(buf));
1965                 buf[n] = 0;
1966                 if (!(tags = strv_split(buf, "\n\r")))
1967                         return -ENOMEM;
1968
1969                 log_debug("Got notification message for unit %s", u->meta.id);
1970
1971                 if (UNIT_VTABLE(u)->notify_message)
1972                         UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
1973
1974                 strv_free(tags);
1975         }
1976
1977         return 0;
1978 }
1979
1980 static int manager_dispatch_sigchld(Manager *m) {
1981         assert(m);
1982
1983         for (;;) {
1984                 siginfo_t si;
1985                 Unit *u;
1986                 int r;
1987
1988                 zero(si);
1989
1990                 /* First we call waitd() for a PID and do not reap the
1991                  * zombie. That way we can still access /proc/$PID for
1992                  * it while it is a zombie. */
1993                 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1994
1995                         if (errno == ECHILD)
1996                                 break;
1997
1998                         if (errno == EINTR)
1999                                 continue;
2000
2001                         return -errno;
2002                 }
2003
2004                 if (si.si_pid <= 0)
2005                         break;
2006
2007                 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
2008                         char *name = NULL;
2009
2010                         get_process_name(si.si_pid, &name);
2011                         log_debug("Got SIGCHLD for process %lu (%s)", (unsigned long) si.si_pid, strna(name));
2012                         free(name);
2013                 }
2014
2015                 /* Let's flush any message the dying child might still
2016                  * have queued for us. This ensures that the process
2017                  * still exists in /proc so that we can figure out
2018                  * which cgroup and hence unit it belongs to. */
2019                 if ((r = manager_process_notify_fd(m)) < 0)
2020                         return r;
2021
2022                 /* And now figure out the unit this belongs to */
2023                 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(si.si_pid))))
2024                         u = cgroup_unit_by_pid(m, si.si_pid);
2025
2026                 /* And now, we actually reap the zombie. */
2027                 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
2028                         if (errno == EINTR)
2029                                 continue;
2030
2031                         return -errno;
2032                 }
2033
2034                 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
2035                         continue;
2036
2037                 log_debug("Child %lu died (code=%s, status=%i/%s)",
2038                           (long unsigned) si.si_pid,
2039                           sigchld_code_to_string(si.si_code),
2040                           si.si_status,
2041                           strna(si.si_code == CLD_EXITED
2042                                 ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
2043                                 : signal_to_string(si.si_status)));
2044
2045                 if (!u)
2046                         continue;
2047
2048                 log_debug("Child %lu belongs to %s", (long unsigned) si.si_pid, u->meta.id);
2049
2050                 hashmap_remove(m->watch_pids, LONG_TO_PTR(si.si_pid));
2051                 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
2052         }
2053
2054         return 0;
2055 }
2056
2057 static int manager_start_target(Manager *m, const char *name, JobMode mode) {
2058         int r;
2059         DBusError error;
2060
2061         dbus_error_init(&error);
2062
2063         log_debug("Activating special unit %s", name);
2064
2065         if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL)) < 0)
2066                 log_error("Failed to enqueue %s job: %s", name, bus_error(&error, r));
2067
2068         dbus_error_free(&error);
2069
2070         return r;
2071 }
2072
2073 static int manager_process_signal_fd(Manager *m) {
2074         ssize_t n;
2075         struct signalfd_siginfo sfsi;
2076         bool sigchld = false;
2077
2078         assert(m);
2079
2080         for (;;) {
2081                 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
2082
2083                         if (n >= 0)
2084                                 return -EIO;
2085
2086                         if (errno == EINTR || errno == EAGAIN)
2087                                 break;
2088
2089                         return -errno;
2090                 }
2091
2092                 if (sfsi.ssi_pid > 0) {
2093                         char *p = NULL;
2094
2095                         get_process_name(sfsi.ssi_pid, &p);
2096
2097                         log_debug("Received SIG%s from PID %lu (%s).",
2098                                   strna(signal_to_string(sfsi.ssi_signo)),
2099                                   (unsigned long) sfsi.ssi_pid, strna(p));
2100                         free(p);
2101                 } else
2102                         log_debug("Received SIG%s.", strna(signal_to_string(sfsi.ssi_signo)));
2103
2104                 switch (sfsi.ssi_signo) {
2105
2106                 case SIGCHLD:
2107                         sigchld = true;
2108                         break;
2109
2110                 case SIGTERM:
2111                         if (m->running_as == MANAGER_SYSTEM) {
2112                                 /* This is for compatibility with the
2113                                  * original sysvinit */
2114                                 m->exit_code = MANAGER_REEXECUTE;
2115                                 break;
2116                         }
2117
2118                         /* Fall through */
2119
2120                 case SIGINT:
2121                         if (m->running_as == MANAGER_SYSTEM) {
2122                                 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
2123                                 break;
2124                         }
2125
2126                         /* Run the exit target if there is one, if not, just exit. */
2127                         if (manager_start_target(m, SPECIAL_EXIT_TARGET, JOB_REPLACE) < 0) {
2128                                 m->exit_code = MANAGER_EXIT;
2129                                 return 0;
2130                         }
2131
2132                         break;
2133
2134                 case SIGWINCH:
2135                         if (m->running_as == MANAGER_SYSTEM)
2136                                 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
2137
2138                         /* This is a nop on non-init */
2139                         break;
2140
2141                 case SIGPWR:
2142                         if (m->running_as == MANAGER_SYSTEM)
2143                                 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
2144
2145                         /* This is a nop on non-init */
2146                         break;
2147
2148                 case SIGUSR1: {
2149                         Unit *u;
2150
2151                         u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
2152
2153                         if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
2154                                 log_info("Trying to reconnect to bus...");
2155                                 bus_init(m, true);
2156                         }
2157
2158                         if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
2159                                 log_info("Loading D-Bus service...");
2160                                 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
2161                         }
2162
2163                         break;
2164                 }
2165
2166                 case SIGUSR2: {
2167                         FILE *f;
2168                         char *dump = NULL;
2169                         size_t size;
2170
2171                         if (!(f = open_memstream(&dump, &size))) {
2172                                 log_warning("Failed to allocate memory stream.");
2173                                 break;
2174                         }
2175
2176                         manager_dump_units(m, f, "\t");
2177                         manager_dump_jobs(m, f, "\t");
2178
2179                         if (ferror(f)) {
2180                                 fclose(f);
2181                                 free(dump);
2182                                 log_warning("Failed to write status stream");
2183                                 break;
2184                         }
2185
2186                         fclose(f);
2187                         log_dump(LOG_INFO, dump);
2188                         free(dump);
2189
2190                         break;
2191                 }
2192
2193                 case SIGHUP:
2194                         m->exit_code = MANAGER_RELOAD;
2195                         break;
2196
2197                 default: {
2198                         /* Starting SIGRTMIN+0 */
2199                         static const char * const target_table[] = {
2200                                 [0] = SPECIAL_DEFAULT_TARGET,
2201                                 [1] = SPECIAL_RESCUE_TARGET,
2202                                 [2] = SPECIAL_EMERGENCY_TARGET,
2203                                 [3] = SPECIAL_HALT_TARGET,
2204                                 [4] = SPECIAL_POWEROFF_TARGET,
2205                                 [5] = SPECIAL_REBOOT_TARGET,
2206                                 [6] = SPECIAL_KEXEC_TARGET
2207                         };
2208
2209                         /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
2210                         static const ManagerExitCode code_table[] = {
2211                                 [0] = MANAGER_HALT,
2212                                 [1] = MANAGER_POWEROFF,
2213                                 [2] = MANAGER_REBOOT,
2214                                 [3] = MANAGER_KEXEC
2215                         };
2216
2217                         if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
2218                             (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
2219                                 manager_start_target(m, target_table[sfsi.ssi_signo - SIGRTMIN],
2220                                                      (sfsi.ssi_signo == 1 || sfsi.ssi_signo == 2) ? JOB_ISOLATE : JOB_REPLACE);
2221                                 break;
2222                         }
2223
2224                         if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
2225                             (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(code_table)) {
2226                                 m->exit_code = code_table[sfsi.ssi_signo - SIGRTMIN - 13];
2227                                 break;
2228                         }
2229
2230                         switch (sfsi.ssi_signo - SIGRTMIN) {
2231
2232                         case 20:
2233                                 log_debug("Enabling showing of status.");
2234                                 m->show_status = true;
2235                                 break;
2236
2237                         case 21:
2238                                 log_debug("Disabling showing of status.");
2239                                 m->show_status = false;
2240                                 break;
2241
2242                         default:
2243                                 log_warning("Got unhandled signal <%s>.", strna(signal_to_string(sfsi.ssi_signo)));
2244                         }
2245                 }
2246                 }
2247         }
2248
2249         if (sigchld)
2250                 return manager_dispatch_sigchld(m);
2251
2252         return 0;
2253 }
2254
2255 static int process_event(Manager *m, struct epoll_event *ev) {
2256         int r;
2257         Watch *w;
2258
2259         assert(m);
2260         assert(ev);
2261
2262         assert(w = ev->data.ptr);
2263
2264         if (w->type == WATCH_INVALID)
2265                 return 0;
2266
2267         switch (w->type) {
2268
2269         case WATCH_SIGNAL:
2270
2271                 /* An incoming signal? */
2272                 if (ev->events != EPOLLIN)
2273                         return -EINVAL;
2274
2275                 if ((r = manager_process_signal_fd(m)) < 0)
2276                         return r;
2277
2278                 break;
2279
2280         case WATCH_NOTIFY:
2281
2282                 /* An incoming daemon notification event? */
2283                 if (ev->events != EPOLLIN)
2284                         return -EINVAL;
2285
2286                 if ((r = manager_process_notify_fd(m)) < 0)
2287                         return r;
2288
2289                 break;
2290
2291         case WATCH_FD:
2292
2293                 /* Some fd event, to be dispatched to the units */
2294                 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
2295                 break;
2296
2297         case WATCH_UNIT_TIMER:
2298         case WATCH_JOB_TIMER: {
2299                 uint64_t v;
2300                 ssize_t k;
2301
2302                 /* Some timer event, to be dispatched to the units */
2303                 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
2304
2305                         if (k < 0 && (errno == EINTR || errno == EAGAIN))
2306                                 break;
2307
2308                         return k < 0 ? -errno : -EIO;
2309                 }
2310
2311                 if (w->type == WATCH_UNIT_TIMER)
2312                         UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
2313                 else
2314                         job_timer_event(w->data.job, v, w);
2315                 break;
2316         }
2317
2318         case WATCH_MOUNT:
2319                 /* Some mount table change, intended for the mount subsystem */
2320                 mount_fd_event(m, ev->events);
2321                 break;
2322
2323         case WATCH_SWAP:
2324                 /* Some swap table change, intended for the swap subsystem */
2325                 swap_fd_event(m, ev->events);
2326                 break;
2327
2328         case WATCH_UDEV:
2329                 /* Some notification from udev, intended for the device subsystem */
2330                 device_fd_event(m, ev->events);
2331                 break;
2332
2333         case WATCH_DBUS_WATCH:
2334                 bus_watch_event(m, w, ev->events);
2335                 break;
2336
2337         case WATCH_DBUS_TIMEOUT:
2338                 bus_timeout_event(m, w, ev->events);
2339                 break;
2340
2341         default:
2342                 log_error("event type=%i", w->type);
2343                 assert_not_reached("Unknown epoll event type.");
2344         }
2345
2346         return 0;
2347 }
2348
2349 int manager_loop(Manager *m) {
2350         int r;
2351
2352         RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 50000);
2353
2354         assert(m);
2355         m->exit_code = MANAGER_RUNNING;
2356
2357         /* Release the path cache */
2358         set_free_free(m->unit_path_cache);
2359         m->unit_path_cache = NULL;
2360
2361         manager_check_finished(m);
2362
2363         /* There might still be some zombies hanging around from
2364          * before we were exec()'ed. Leat's reap them */
2365         if ((r = manager_dispatch_sigchld(m)) < 0)
2366                 return r;
2367
2368         while (m->exit_code == MANAGER_RUNNING) {
2369                 struct epoll_event event;
2370                 int n;
2371
2372                 if (!ratelimit_test(&rl)) {
2373                         /* Yay, something is going seriously wrong, pause a little */
2374                         log_warning("Looping too fast. Throttling execution a little.");
2375                         sleep(1);
2376                 }
2377
2378                 if (manager_dispatch_load_queue(m) > 0)
2379                         continue;
2380
2381                 if (manager_dispatch_run_queue(m) > 0)
2382                         continue;
2383
2384                 if (bus_dispatch(m) > 0)
2385                         continue;
2386
2387                 if (manager_dispatch_cleanup_queue(m) > 0)
2388                         continue;
2389
2390                 if (manager_dispatch_gc_queue(m) > 0)
2391                         continue;
2392
2393                 if (manager_dispatch_dbus_queue(m) > 0)
2394                         continue;
2395
2396                 if (swap_dispatch_reload(m) > 0)
2397                         continue;
2398
2399                 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2400
2401                         if (errno == EINTR)
2402                                 continue;
2403
2404                         return -errno;
2405                 }
2406
2407                 assert(n == 1);
2408
2409                 if ((r = process_event(m, &event)) < 0)
2410                         return r;
2411         }
2412
2413         return m->exit_code;
2414 }
2415
2416 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2417         char *n;
2418         Unit *u;
2419
2420         assert(m);
2421         assert(s);
2422         assert(_u);
2423
2424         if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2425                 return -EINVAL;
2426
2427         if (!(n = bus_path_unescape(s+31)))
2428                 return -ENOMEM;
2429
2430         u = manager_get_unit(m, n);
2431         free(n);
2432
2433         if (!u)
2434                 return -ENOENT;
2435
2436         *_u = u;
2437
2438         return 0;
2439 }
2440
2441 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2442         Job *j;
2443         unsigned id;
2444         int r;
2445
2446         assert(m);
2447         assert(s);
2448         assert(_j);
2449
2450         if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2451                 return -EINVAL;
2452
2453         if ((r = safe_atou(s + 30, &id)) < 0)
2454                 return r;
2455
2456         if (!(j = manager_get_job(m, id)))
2457                 return -ENOENT;
2458
2459         *_j = j;
2460
2461         return 0;
2462 }
2463
2464 void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
2465
2466 #ifdef HAVE_AUDIT
2467         char *p;
2468
2469         if (m->audit_fd < 0)
2470                 return;
2471
2472         /* Don't generate audit events if the service was already
2473          * started and we're just deserializing */
2474         if (m->n_deserializing > 0)
2475                 return;
2476
2477         if (m->running_as != MANAGER_SYSTEM)
2478                 return;
2479
2480         if (u->meta.type != UNIT_SERVICE)
2481                 return;
2482
2483         if (!(p = unit_name_to_prefix_and_instance(u->meta.id))) {
2484                 log_error("Failed to allocate unit name for audit message: %s", strerror(ENOMEM));
2485                 return;
2486         }
2487
2488         if (audit_log_user_comm_message(m->audit_fd, type, "", p, NULL, NULL, NULL, success) < 0) {
2489                 log_warning("Failed to send audit message: %m");
2490
2491                 if (errno == EPERM) {
2492                         /* We aren't allowed to send audit messages?
2493                          * Then let's not retry again, to avoid
2494                          * spamming the user with the same and same
2495                          * messages over and over. */
2496
2497                         audit_close(m->audit_fd);
2498                         m->audit_fd = -1;
2499                 }
2500         }
2501
2502         free(p);
2503 #endif
2504
2505 }
2506
2507 void manager_send_unit_plymouth(Manager *m, Unit *u) {
2508         int fd = -1;
2509         union sockaddr_union sa;
2510         int n = 0;
2511         char *message = NULL;
2512
2513         /* Don't generate plymouth events if the service was already
2514          * started and we're just deserializing */
2515         if (m->n_deserializing > 0)
2516                 return;
2517
2518         if (m->running_as != MANAGER_SYSTEM)
2519                 return;
2520
2521         if (u->meta.type != UNIT_SERVICE &&
2522             u->meta.type != UNIT_MOUNT &&
2523             u->meta.type != UNIT_SWAP)
2524                 return;
2525
2526         /* We set SOCK_NONBLOCK here so that we rather drop the
2527          * message then wait for plymouth */
2528         if ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
2529                 log_error("socket() failed: %m");
2530                 return;
2531         }
2532
2533         zero(sa);
2534         sa.sa.sa_family = AF_UNIX;
2535         strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
2536         if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
2537
2538                 if (errno != EPIPE &&
2539                     errno != EAGAIN &&
2540                     errno != ENOENT &&
2541                     errno != ECONNREFUSED &&
2542                     errno != ECONNRESET &&
2543                     errno != ECONNABORTED)
2544                         log_error("connect() failed: %m");
2545
2546                 goto finish;
2547         }
2548
2549         if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->meta.id) + 1), u->meta.id, &n) < 0) {
2550                 log_error("Out of memory");
2551                 goto finish;
2552         }
2553
2554         errno = 0;
2555         if (write(fd, message, n + 1) != n + 1) {
2556
2557                 if (errno != EPIPE &&
2558                     errno != EAGAIN &&
2559                     errno != ENOENT &&
2560                     errno != ECONNREFUSED &&
2561                     errno != ECONNRESET &&
2562                     errno != ECONNABORTED)
2563                         log_error("Failed to write Plymouth message: %m");
2564
2565                 goto finish;
2566         }
2567
2568 finish:
2569         if (fd >= 0)
2570                 close_nointr_nofail(fd);
2571
2572         free(message);
2573 }
2574
2575 void manager_dispatch_bus_name_owner_changed(
2576                 Manager *m,
2577                 const char *name,
2578                 const char* old_owner,
2579                 const char *new_owner) {
2580
2581         Unit *u;
2582
2583         assert(m);
2584         assert(name);
2585
2586         if (!(u = hashmap_get(m->watch_bus, name)))
2587                 return;
2588
2589         UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2590 }
2591
2592 void manager_dispatch_bus_query_pid_done(
2593                 Manager *m,
2594                 const char *name,
2595                 pid_t pid) {
2596
2597         Unit *u;
2598
2599         assert(m);
2600         assert(name);
2601         assert(pid >= 1);
2602
2603         if (!(u = hashmap_get(m->watch_bus, name)))
2604                 return;
2605
2606         UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2607 }
2608
2609 int manager_open_serialization(Manager *m, FILE **_f) {
2610         char *path = NULL;
2611         mode_t saved_umask;
2612         int fd;
2613         FILE *f;
2614
2615         assert(_f);
2616
2617         if (m->running_as == MANAGER_SYSTEM)
2618                 asprintf(&path, "/run/systemd/dump-%lu-XXXXXX", (unsigned long) getpid());
2619         else
2620                 asprintf(&path, "/tmp/systemd-dump-%lu-XXXXXX", (unsigned long) getpid());
2621
2622         if (!path)
2623                 return -ENOMEM;
2624
2625         saved_umask = umask(0077);
2626         fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2627         umask(saved_umask);
2628
2629         if (fd < 0) {
2630                 free(path);
2631                 return -errno;
2632         }
2633
2634         unlink(path);
2635
2636         log_debug("Serializing state to %s", path);
2637         free(path);
2638
2639         if (!(f = fdopen(fd, "w+")))
2640                 return -errno;
2641
2642         *_f = f;
2643
2644         return 0;
2645 }
2646
2647 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2648         Iterator i;
2649         Unit *u;
2650         const char *t;
2651         int r;
2652
2653         assert(m);
2654         assert(f);
2655         assert(fds);
2656
2657         m->n_serializing ++;
2658
2659         fprintf(f, "current-job-id=%i\n", m->current_job_id);
2660         fprintf(f, "taint-usr=%s\n", yes_no(m->taint_usr));
2661
2662         dual_timestamp_serialize(f, "initrd-timestamp", &m->initrd_timestamp);
2663         dual_timestamp_serialize(f, "startup-timestamp", &m->startup_timestamp);
2664         dual_timestamp_serialize(f, "finish-timestamp", &m->finish_timestamp);
2665
2666         fputc('\n', f);
2667
2668         HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2669                 if (u->meta.id != t)
2670                         continue;
2671
2672                 if (!unit_can_serialize(u))
2673                         continue;
2674
2675                 /* Start marker */
2676                 fputs(u->meta.id, f);
2677                 fputc('\n', f);
2678
2679                 if ((r = unit_serialize(u, f, fds)) < 0) {
2680                         m->n_serializing --;
2681                         return r;
2682                 }
2683         }
2684
2685         assert(m->n_serializing > 0);
2686         m->n_serializing --;
2687
2688         if (ferror(f))
2689                 return -EIO;
2690
2691         r = bus_fdset_add_all(m, fds);
2692         if (r < 0)
2693                 return r;
2694
2695         return 0;
2696 }
2697
2698 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2699         int r = 0;
2700
2701         assert(m);
2702         assert(f);
2703
2704         log_debug("Deserializing state...");
2705
2706         m->n_deserializing ++;
2707
2708         for (;;) {
2709                 char line[LINE_MAX], *l;
2710
2711                 if (!fgets(line, sizeof(line), f)) {
2712                         if (feof(f))
2713                                 r = 0;
2714                         else
2715                                 r = -errno;
2716
2717                         goto finish;
2718                 }
2719
2720                 char_array_0(line);
2721                 l = strstrip(line);
2722
2723                 if (l[0] == 0)
2724                         break;
2725
2726                 if (startswith(l, "current-job-id=")) {
2727                         uint32_t id;
2728
2729                         if (safe_atou32(l+15, &id) < 0)
2730                                 log_debug("Failed to parse current job id value %s", l+15);
2731                         else
2732                                 m->current_job_id = MAX(m->current_job_id, id);
2733                 } else if (startswith(l, "taint-usr=")) {
2734                         int b;
2735
2736                         if ((b = parse_boolean(l+10)) < 0)
2737                                 log_debug("Failed to parse taint /usr flag %s", l+10);
2738                         else
2739                                 m->taint_usr = m->taint_usr || b;
2740                 } else if (startswith(l, "initrd-timestamp="))
2741                         dual_timestamp_deserialize(l+17, &m->initrd_timestamp);
2742                 else if (startswith(l, "startup-timestamp="))
2743                         dual_timestamp_deserialize(l+18, &m->startup_timestamp);
2744                 else if (startswith(l, "finish-timestamp="))
2745                         dual_timestamp_deserialize(l+17, &m->finish_timestamp);
2746                 else
2747                         log_debug("Unknown serialization item '%s'", l);
2748         }
2749
2750         for (;;) {
2751                 Unit *u;
2752                 char name[UNIT_NAME_MAX+2];
2753
2754                 /* Start marker */
2755                 if (!fgets(name, sizeof(name), f)) {
2756                         if (feof(f))
2757                                 r = 0;
2758                         else
2759                                 r = -errno;
2760
2761                         goto finish;
2762                 }
2763
2764                 char_array_0(name);
2765
2766                 if ((r = manager_load_unit(m, strstrip(name), NULL, NULL, &u)) < 0)
2767                         goto finish;
2768
2769                 if ((r = unit_deserialize(u, f, fds)) < 0)
2770                         goto finish;
2771         }
2772
2773 finish:
2774         if (ferror(f)) {
2775                 r = -EIO;
2776                 goto finish;
2777         }
2778
2779         assert(m->n_deserializing > 0);
2780         m->n_deserializing --;
2781
2782         return r;
2783 }
2784
2785 int manager_reload(Manager *m) {
2786         int r, q;
2787         FILE *f;
2788         FDSet *fds;
2789
2790         assert(m);
2791
2792         if ((r = manager_open_serialization(m, &f)) < 0)
2793                 return r;
2794
2795         m->n_serializing ++;
2796
2797         if (!(fds = fdset_new())) {
2798                 m->n_serializing --;
2799                 r = -ENOMEM;
2800                 goto finish;
2801         }
2802
2803         if ((r = manager_serialize(m, f, fds)) < 0) {
2804                 m->n_serializing --;
2805                 goto finish;
2806         }
2807
2808         if (fseeko(f, 0, SEEK_SET) < 0) {
2809                 m->n_serializing --;
2810                 r = -errno;
2811                 goto finish;
2812         }
2813
2814         /* From here on there is no way back. */
2815         manager_clear_jobs_and_units(m);
2816         manager_undo_generators(m);
2817
2818         assert(m->n_serializing > 0);
2819         m->n_serializing --;
2820
2821         /* Find new unit paths */
2822         lookup_paths_free(&m->lookup_paths);
2823         if ((q = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
2824                 r = q;
2825
2826         manager_run_generators(m);
2827
2828         manager_build_unit_path_cache(m);
2829
2830         m->n_deserializing ++;
2831
2832         /* First, enumerate what we can from all config files */
2833         if ((q = manager_enumerate(m)) < 0)
2834                 r = q;
2835
2836         /* Second, deserialize our stored data */
2837         if ((q = manager_deserialize(m, f, fds)) < 0)
2838                 r = q;
2839
2840         fclose(f);
2841         f = NULL;
2842
2843         /* Third, fire things up! */
2844         if ((q = manager_coldplug(m)) < 0)
2845                 r = q;
2846
2847         assert(m->n_deserializing > 0);
2848         m->n_deserializing--;
2849
2850 finish:
2851         if (f)
2852                 fclose(f);
2853
2854         if (fds)
2855                 fdset_free(fds);
2856
2857         return r;
2858 }
2859
2860 bool manager_is_booting_or_shutting_down(Manager *m) {
2861         Unit *u;
2862
2863         assert(m);
2864
2865         /* Is the initial job still around? */
2866         if (manager_get_job(m, 1))
2867                 return true;
2868
2869         /* Is there a job for the shutdown target? */
2870         if (((u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET))))
2871                 return !!u->meta.job;
2872
2873         return false;
2874 }
2875
2876 void manager_reset_failed(Manager *m) {
2877         Unit *u;
2878         Iterator i;
2879
2880         assert(m);
2881
2882         HASHMAP_FOREACH(u, m->units, i)
2883                 unit_reset_failed(u);
2884 }
2885
2886 bool manager_unit_pending_inactive(Manager *m, const char *name) {
2887         Unit *u;
2888
2889         assert(m);
2890         assert(name);
2891
2892         /* Returns true if the unit is inactive or going down */
2893         if (!(u = manager_get_unit(m, name)))
2894                 return true;
2895
2896         return unit_pending_inactive(u);
2897 }
2898
2899 void manager_check_finished(Manager *m) {
2900         char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX];
2901
2902         assert(m);
2903
2904         if (dual_timestamp_is_set(&m->finish_timestamp))
2905                 return;
2906
2907         if (hashmap_size(m->jobs) > 0)
2908                 return;
2909
2910         dual_timestamp_get(&m->finish_timestamp);
2911
2912         if (m->running_as == MANAGER_SYSTEM && detect_container(NULL) <= 0) {
2913
2914                 if (dual_timestamp_is_set(&m->initrd_timestamp)) {
2915                         log_info("Startup finished in %s (kernel) + %s (initrd) + %s (userspace) = %s.",
2916                                  format_timespan(kernel, sizeof(kernel),
2917                                                  m->initrd_timestamp.monotonic),
2918                                  format_timespan(initrd, sizeof(initrd),
2919                                                  m->startup_timestamp.monotonic - m->initrd_timestamp.monotonic),
2920                                  format_timespan(userspace, sizeof(userspace),
2921                                                  m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2922                                  format_timespan(sum, sizeof(sum),
2923                                                  m->finish_timestamp.monotonic));
2924                 } else
2925                         log_info("Startup finished in %s (kernel) + %s (userspace) = %s.",
2926                                  format_timespan(kernel, sizeof(kernel),
2927                                                  m->startup_timestamp.monotonic),
2928                                  format_timespan(userspace, sizeof(userspace),
2929                                                  m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2930                                  format_timespan(sum, sizeof(sum),
2931                                                  m->finish_timestamp.monotonic));
2932         } else
2933                 log_debug("Startup finished in %s.",
2934                           format_timespan(userspace, sizeof(userspace),
2935                                           m->finish_timestamp.monotonic - m->startup_timestamp.monotonic));
2936
2937 }
2938
2939 void manager_run_generators(Manager *m) {
2940         DIR *d = NULL;
2941         const char *generator_path;
2942         const char *argv[3];
2943
2944         assert(m);
2945
2946         generator_path = m->running_as == MANAGER_SYSTEM ? SYSTEM_GENERATOR_PATH : USER_GENERATOR_PATH;
2947         if (!(d = opendir(generator_path))) {
2948
2949                 if (errno == ENOENT)
2950                         return;
2951
2952                 log_error("Failed to enumerate generator directory: %m");
2953                 return;
2954         }
2955
2956         if (!m->generator_unit_path) {
2957                 const char *p;
2958                 char user_path[] = "/tmp/systemd-generator-XXXXXX";
2959
2960                 if (m->running_as == MANAGER_SYSTEM && getpid() == 1) {
2961                         p = "/run/systemd/generator";
2962
2963                         if (mkdir_p(p, 0755) < 0) {
2964                                 log_error("Failed to create generator directory: %m");
2965                                 goto finish;
2966                         }
2967
2968                 } else {
2969                         if (!(p = mkdtemp(user_path))) {
2970                                 log_error("Failed to create generator directory: %m");
2971                                 goto finish;
2972                         }
2973                 }
2974
2975                 if (!(m->generator_unit_path = strdup(p))) {
2976                         log_error("Failed to allocate generator unit path.");
2977                         goto finish;
2978                 }
2979         }
2980
2981         argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */
2982         argv[1] = m->generator_unit_path;
2983         argv[2] = NULL;
2984
2985         execute_directory(generator_path, d, (char**) argv);
2986
2987         if (rmdir(m->generator_unit_path) >= 0) {
2988                 /* Uh? we were able to remove this dir? I guess that
2989                  * means the directory was empty, hence let's shortcut
2990                  * this */
2991
2992                 free(m->generator_unit_path);
2993                 m->generator_unit_path = NULL;
2994                 goto finish;
2995         }
2996
2997         if (!strv_find(m->lookup_paths.unit_path, m->generator_unit_path)) {
2998                 char **l;
2999
3000                 if (!(l = strv_append(m->lookup_paths.unit_path, m->generator_unit_path))) {
3001                         log_error("Failed to add generator directory to unit search path: %m");
3002                         goto finish;
3003                 }
3004
3005                 strv_free(m->lookup_paths.unit_path);
3006                 m->lookup_paths.unit_path = l;
3007
3008                 log_debug("Added generator unit path %s to search path.", m->generator_unit_path);
3009         }
3010
3011 finish:
3012         if (d)
3013                 closedir(d);
3014 }
3015
3016 void manager_undo_generators(Manager *m) {
3017         assert(m);
3018
3019         if (!m->generator_unit_path)
3020                 return;
3021
3022         strv_remove(m->lookup_paths.unit_path, m->generator_unit_path);
3023         rm_rf(m->generator_unit_path, false, true);
3024
3025         free(m->generator_unit_path);
3026         m->generator_unit_path = NULL;
3027 }
3028
3029 int manager_set_default_controllers(Manager *m, char **controllers) {
3030         char **l;
3031
3032         assert(m);
3033
3034         if (!(l = strv_copy(controllers)))
3035                 return -ENOMEM;
3036
3037         strv_free(m->default_controllers);
3038         m->default_controllers = l;
3039
3040         return 0;
3041 }
3042
3043 void manager_recheck_syslog(Manager *m) {
3044         Unit *u;
3045
3046         assert(m);
3047
3048         if (m->running_as != MANAGER_SYSTEM)
3049                 return;
3050
3051         if ((u = manager_get_unit(m, SPECIAL_SYSLOG_SOCKET))) {
3052                 SocketState state;
3053
3054                 state = SOCKET(u)->state;
3055
3056                 if (state != SOCKET_DEAD &&
3057                     state != SOCKET_FAILED &&
3058                     state != SOCKET_RUNNING) {
3059
3060                         /* Hmm, the socket is not set up, or is still
3061                          * listening, let's better not try to use
3062                          * it. Note that we have no problem if the
3063                          * socket is completely down, since there
3064                          * might be a foreign /dev/log socket around
3065                          * and we want to make use of that.
3066                          */
3067
3068                         log_close_syslog();
3069                         return;
3070                 }
3071         }
3072
3073         if ((u = manager_get_unit(m, SPECIAL_SYSLOG_TARGET)))
3074                 if (TARGET(u)->state != TARGET_ACTIVE) {
3075                         log_close_syslog();
3076                         return;
3077                 }
3078
3079         /* Hmm, OK, so the socket is either fully up, or fully down,
3080          * and the target is up, then let's make use of the socket */
3081         log_open();
3082 }
3083
3084 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
3085         [MANAGER_SYSTEM] = "system",
3086         [MANAGER_USER] = "user"
3087 };
3088
3089 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);