src/manager.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <assert.h>
  23 #include <errno.h>
  24 #include <string.h>
  25 #include <sys/epoll.h>
  26 #include <signal.h>
  27 #include <sys/signalfd.h>
  28 #include <sys/wait.h>
  29 #include <unistd.h>
  30 #include <sys/poll.h>
  31 #include <sys/reboot.h>
  32 #include <sys/ioctl.h>
  33 #include <linux/kd.h>
  34 #include <termios.h>
  35 #include <fcntl.h>
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 #include <dirent.h>
  39
  40 #ifdef HAVE_AUDIT
  41 #include <libaudit.h>
  42 #endif
  43
  44 #include "manager.h"
  45 #include "hashmap.h"
  46 #include "macro.h"
  47 #include "strv.h"
  48 #include "log.h"
  49 #include "util.h"
  50 #include "ratelimit.h"
  51 #include "cgroup.h"
  52 #include "mount-setup.h"
  53 #include "unit-name.h"
  54 #include "dbus-unit.h"
  55 #include "dbus-job.h"
  56 #include "missing.h"
  57 #include "path-lookup.h"
  58 #include "special.h"
  59 #include "bus-errors.h"
  60 #include "exit-status.h"
  61
  62 /* As soon as 16 units are in our GC queue, make sure to run a gc sweep */
  63 #define GC_QUEUE_ENTRIES_MAX 16
  64
  65 /* As soon as 5s passed since a unit was added to our GC queue, make sure to run a gc sweep */
  66 #define GC_QUEUE_USEC_MAX (10*USEC_PER_SEC)
  67
  68 /* Where clients shall send notification messages to */
  69 #define NOTIFY_SOCKET "/org/freedesktop/systemd1/notify"
  70
  71 static int manager_setup_notify(Manager *m) {
  72         union {
  73                 struct sockaddr sa;
  74                 struct sockaddr_un un;
  75         } sa;
  76         struct epoll_event ev;
  77         int one = 1;
  78
  79         assert(m);
  80
  81         m->notify_watch.type = WATCH_NOTIFY;
  82         if ((m->notify_watch.fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
  83                 log_error("Failed to allocate notification socket: %m");
  84                 return -errno;
  85         }
  86
  87         zero(sa);
  88         sa.sa.sa_family = AF_UNIX;
  89
  90         if (getpid() != 1)
  91                 snprintf(sa.un.sun_path+1, sizeof(sa.un.sun_path)-1, NOTIFY_SOCKET "/%llu", random_ull());
  92         else
  93                 strncpy(sa.un.sun_path+1, NOTIFY_SOCKET, sizeof(sa.un.sun_path)-1);
  94
  95         if (bind(m->notify_watch.fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
  96                 log_error("bind() failed: %m");
  97                 return -errno;
  98         }
  99
 100         if (setsockopt(m->notify_watch.fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
 101                 log_error("SO_PASSCRED failed: %m");
 102                 return -errno;
 103         }
 104
 105         zero(ev);
 106         ev.events = EPOLLIN;
 107         ev.data.ptr = &m->notify_watch;
 108
 109         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->notify_watch.fd, &ev) < 0)
 110                 return -errno;
 111
 112         if (!(m->notify_socket = strdup(sa.un.sun_path+1)))
 113                 return -ENOMEM;
 114
 115         log_debug("Using notification socket %s", m->notify_socket);
 116
 117         return 0;
 118 }
 119
 120 static int enable_special_signals(Manager *m) {
 121         char fd;
 122
 123         assert(m);
 124
 125         /* Enable that we get SIGINT on control-alt-del */
 126         if (reboot(RB_DISABLE_CAD) < 0)
 127                 log_warning("Failed to enable ctrl-alt-del handling: %m");
 128
 129         if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY)) < 0)
 130                 log_warning("Failed to open /dev/tty0: %m");
 131         else {
 132                 /* Enable that we get SIGWINCH on kbrequest */
 133                 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
 134                         log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
 135
 136                 close_nointr_nofail(fd);
 137         }
 138
 139         return 0;
 140 }
 141
 142 static int manager_setup_signals(Manager *m) {
 143         sigset_t mask;
 144         struct epoll_event ev;
 145         struct sigaction sa;
 146
 147         assert(m);
 148
 149         /* We are not interested in SIGSTOP and friends. */
 150         zero(sa);
 151         sa.sa_handler = SIG_DFL;
 152         sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
 153         assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 154
 155         assert_se(sigemptyset(&mask) == 0);
 156
 157         sigset_add_many(&mask,
 158                         SIGCHLD,     /* Child died */
 159                         SIGTERM,     /* Reexecute daemon */
 160                         SIGHUP,      /* Reload configuration */
 161                         SIGUSR1,     /* systemd/upstart: reconnect to D-Bus */
 162                         SIGUSR2,     /* systemd: dump status */
 163                         SIGINT,      /* Kernel sends us this on control-alt-del */
 164                         SIGWINCH,    /* Kernel sends us this on kbrequest (alt-arrowup) */
 165                         SIGPWR,      /* Some kernel drivers and upsd send us this on power failure */
 166                         SIGRTMIN+0,  /* systemd: start default.target */
 167                         SIGRTMIN+1,  /* systemd: isolate rescue.target */
 168                         SIGRTMIN+2,  /* systemd: isolate emergency.target */
 169                         SIGRTMIN+3,  /* systemd: start halt.target */
 170                         SIGRTMIN+4,  /* systemd: start poweroff.target */
 171                         SIGRTMIN+5,  /* systemd: start reboot.target */
 172                         SIGRTMIN+6,  /* systemd: start kexec.target */
 173                         SIGRTMIN+13, /* systemd: Immediate halt */
 174                         SIGRTMIN+14, /* systemd: Immediate poweroff */
 175                         SIGRTMIN+15, /* systemd: Immediate reboot */
 176                         SIGRTMIN+16, /* systemd: Immediate kexec */
 177                         SIGRTMIN+20, /* systemd: enable status messages */
 178                         SIGRTMIN+21, /* systemd: disable status messages */
 179                         -1);
 180         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
 181
 182         m->signal_watch.type = WATCH_SIGNAL;
 183         if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
 184                 return -errno;
 185
 186         zero(ev);
 187         ev.events = EPOLLIN;
 188         ev.data.ptr = &m->signal_watch;
 189
 190         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
 191                 return -errno;
 192
 193         if (m->running_as == MANAGER_SYSTEM)
 194                 return enable_special_signals(m);
 195
 196         return 0;
 197 }
 198
 199 int manager_new(ManagerRunningAs running_as, Manager **_m) {
 200         Manager *m;
 201         int r = -ENOMEM;
 202
 203         assert(_m);
 204         assert(running_as >= 0);
 205         assert(running_as < _MANAGER_RUNNING_AS_MAX);
 206
 207         if (!(m = new0(Manager, 1)))
 208                 return -ENOMEM;
 209
 210         dual_timestamp_get(&m->startup_timestamp);
 211
 212         m->running_as = running_as;
 213         m->name_data_slot = m->subscribed_data_slot = -1;
 214         m->exit_code = _MANAGER_EXIT_CODE_INVALID;
 215         m->pin_cgroupfs_fd = -1;
 216
 217 #ifdef HAVE_AUDIT
 218         m->audit_fd = -1;
 219 #endif
 220
 221         m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = m->swap_watch.fd = -1;
 222         m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
 223
 224         if (!(m->environment = strv_copy(environ)))
 225                 goto fail;
 226
 227         if (!(m->default_controllers = strv_new("cpu", NULL)))
 228                 goto fail;
 229
 230         if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
 231                 goto fail;
 232
 233         if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
 234                 goto fail;
 235
 236         if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
 237                 goto fail;
 238
 239         if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
 240                 goto fail;
 241
 242         if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
 243                 goto fail;
 244
 245         if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
 246                 goto fail;
 247
 248         if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
 249                 goto fail;
 250
 251         if ((r = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
 252                 goto fail;
 253
 254         if ((r = manager_setup_signals(m)) < 0)
 255                 goto fail;
 256
 257         if ((r = manager_setup_cgroup(m)) < 0)
 258                 goto fail;
 259
 260         if ((r = manager_setup_notify(m)) < 0)
 261                 goto fail;
 262
 263         /* Try to connect to the busses, if possible. */
 264         if ((r = bus_init(m, running_as != MANAGER_SYSTEM)) < 0)
 265                 goto fail;
 266
 267 #ifdef HAVE_AUDIT
 268         if ((m->audit_fd = audit_open()) < 0)
 269                 log_error("Failed to connect to audit log: %m");
 270 #endif
 271
 272         *_m = m;
 273         return 0;
 274
 275 fail:
 276         manager_free(m);
 277         return r;
 278 }
 279
 280 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
 281         Meta *meta;
 282         unsigned n = 0;
 283
 284         assert(m);
 285
 286         while ((meta = m->cleanup_queue)) {
 287                 assert(meta->in_cleanup_queue);
 288
 289                 unit_free((Unit*) meta);
 290                 n++;
 291         }
 292
 293         return n;
 294 }
 295
 296 enum {
 297         GC_OFFSET_IN_PATH,  /* This one is on the path we were traveling */
 298         GC_OFFSET_UNSURE,   /* No clue */
 299         GC_OFFSET_GOOD,     /* We still need this unit */
 300         GC_OFFSET_BAD,      /* We don't need this unit anymore */
 301         _GC_OFFSET_MAX
 302 };
 303
 304 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
 305         Iterator i;
 306         Unit *other;
 307         bool is_bad;
 308
 309         assert(u);
 310
 311         if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
 312             u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
 313             u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
 314                 return;
 315
 316         if (u->meta.in_cleanup_queue)
 317                 goto bad;
 318
 319         if (unit_check_gc(u))
 320                 goto good;
 321
 322         u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
 323
 324         is_bad = true;
 325
 326         SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
 327                 unit_gc_sweep(other, gc_marker);
 328
 329                 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
 330                         goto good;
 331
 332                 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
 333                         is_bad = false;
 334         }
 335
 336         if (is_bad)
 337                 goto bad;
 338
 339         /* We were unable to find anything out about this entry, so
 340          * let's investigate it later */
 341         u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
 342         unit_add_to_gc_queue(u);
 343         return;
 344
 345 bad:
 346         /* We definitely know that this one is not useful anymore, so
 347          * let's mark it for deletion */
 348         u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
 349         unit_add_to_cleanup_queue(u);
 350         return;
 351
 352 good:
 353         u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
 354 }
 355
 356 static unsigned manager_dispatch_gc_queue(Manager *m) {
 357         Meta *meta;
 358         unsigned n = 0;
 359         unsigned gc_marker;
 360
 361         assert(m);
 362
 363         if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
 364             (m->gc_queue_timestamp <= 0 ||
 365              (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
 366                 return 0;
 367
 368         log_debug("Running GC...");
 369
 370         m->gc_marker += _GC_OFFSET_MAX;
 371         if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
 372                 m->gc_marker = 1;
 373
 374         gc_marker = m->gc_marker;
 375
 376         while ((meta = m->gc_queue)) {
 377                 assert(meta->in_gc_queue);
 378
 379                 unit_gc_sweep((Unit*) meta, gc_marker);
 380
 381                 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
 382                 meta->in_gc_queue = false;
 383
 384                 n++;
 385
 386                 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
 387                     meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
 388                         log_debug("Collecting %s", meta->id);
 389                         meta->gc_marker = gc_marker + GC_OFFSET_BAD;
 390                         unit_add_to_cleanup_queue((Unit*) meta);
 391                 }
 392         }
 393
 394         m->n_in_gc_queue = 0;
 395         m->gc_queue_timestamp = 0;
 396
 397         return n;
 398 }
 399
 400 static void manager_clear_jobs_and_units(Manager *m) {
 401         Job *j;
 402         Unit *u;
 403
 404         assert(m);
 405
 406         while ((j = hashmap_first(m->transaction_jobs)))
 407                 job_free(j);
 408
 409         while ((u = hashmap_first(m->units)))
 410                 unit_free(u);
 411
 412         manager_dispatch_cleanup_queue(m);
 413
 414         assert(!m->load_queue);
 415         assert(!m->run_queue);
 416         assert(!m->dbus_unit_queue);
 417         assert(!m->dbus_job_queue);
 418         assert(!m->cleanup_queue);
 419         assert(!m->gc_queue);
 420
 421         assert(hashmap_isempty(m->transaction_jobs));
 422         assert(hashmap_isempty(m->jobs));
 423         assert(hashmap_isempty(m->units));
 424 }
 425
 426 void manager_free(Manager *m) {
 427         UnitType c;
 428
 429         assert(m);
 430
 431         manager_clear_jobs_and_units(m);
 432
 433         for (c = 0; c < _UNIT_TYPE_MAX; c++)
 434                 if (unit_vtable[c]->shutdown)
 435                         unit_vtable[c]->shutdown(m);
 436
 437         /* If we reexecute ourselves, we keep the root cgroup
 438          * around */
 439         manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
 440
 441         manager_undo_generators(m);
 442
 443         bus_done(m);
 444
 445         hashmap_free(m->units);
 446         hashmap_free(m->jobs);
 447         hashmap_free(m->transaction_jobs);
 448         hashmap_free(m->watch_pids);
 449         hashmap_free(m->watch_bus);
 450
 451         if (m->epoll_fd >= 0)
 452                 close_nointr_nofail(m->epoll_fd);
 453         if (m->signal_watch.fd >= 0)
 454                 close_nointr_nofail(m->signal_watch.fd);
 455         if (m->notify_watch.fd >= 0)
 456                 close_nointr_nofail(m->notify_watch.fd);
 457
 458 #ifdef HAVE_AUDIT
 459         if (m->audit_fd >= 0)
 460                 audit_close(m->audit_fd);
 461 #endif
 462
 463         free(m->notify_socket);
 464
 465         lookup_paths_free(&m->lookup_paths);
 466         strv_free(m->environment);
 467
 468         strv_free(m->default_controllers);
 469
 470         hashmap_free(m->cgroup_bondings);
 471         set_free_free(m->unit_path_cache);
 472
 473         free(m);
 474 }
 475
 476 int manager_enumerate(Manager *m) {
 477         int r = 0, q;
 478         UnitType c;
 479
 480         assert(m);
 481
 482         /* Let's ask every type to load all units from disk/kernel
 483          * that it might know */
 484         for (c = 0; c < _UNIT_TYPE_MAX; c++)
 485                 if (unit_vtable[c]->enumerate)
 486                         if ((q = unit_vtable[c]->enumerate(m)) < 0)
 487                                 r = q;
 488
 489         manager_dispatch_load_queue(m);
 490         return r;
 491 }
 492
 493 int manager_coldplug(Manager *m) {
 494         int r = 0, q;
 495         Iterator i;
 496         Unit *u;
 497         char *k;
 498
 499         assert(m);
 500
 501         /* Then, let's set up their initial state. */
 502         HASHMAP_FOREACH_KEY(u, k, m->units, i) {
 503
 504                 /* ignore aliases */
 505                 if (u->meta.id != k)
 506                         continue;
 507
 508                 if ((q = unit_coldplug(u)) < 0)
 509                         r = q;
 510         }
 511
 512         return r;
 513 }
 514
 515 static void manager_build_unit_path_cache(Manager *m) {
 516         char **i;
 517         DIR *d = NULL;
 518         int r;
 519
 520         assert(m);
 521
 522         set_free_free(m->unit_path_cache);
 523
 524         if (!(m->unit_path_cache = set_new(string_hash_func, string_compare_func))) {
 525                 log_error("Failed to allocate unit path cache.");
 526                 return;
 527         }
 528
 529         /* This simply builds a list of files we know exist, so that
 530          * we don't always have to go to disk */
 531
 532         STRV_FOREACH(i, m->lookup_paths.unit_path) {
 533                 struct dirent *de;
 534
 535                 if (!(d = opendir(*i))) {
 536                         log_error("Failed to open directory: %m");
 537                         continue;
 538                 }
 539
 540                 while ((de = readdir(d))) {
 541                         char *p;
 542
 543                         if (ignore_file(de->d_name))
 544                                 continue;
 545
 546                         if (asprintf(&p, "%s/%s", streq(*i, "/") ? "" : *i, de->d_name) < 0) {
 547                                 r = -ENOMEM;
 548                                 goto fail;
 549                         }
 550
 551                         if ((r = set_put(m->unit_path_cache, p)) < 0) {
 552                                 free(p);
 553                                 goto fail;
 554                         }
 555                 }
 556
 557                 closedir(d);
 558                 d = NULL;
 559         }
 560
 561         return;
 562
 563 fail:
 564         log_error("Failed to build unit path cache: %s", strerror(-r));
 565
 566         set_free_free(m->unit_path_cache);
 567         m->unit_path_cache = NULL;
 568
 569         if (d)
 570                 closedir(d);
 571 }
 572
 573 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
 574         int r, q;
 575
 576         assert(m);
 577
 578         manager_run_generators(m);
 579
 580         manager_build_unit_path_cache(m);
 581
 582         /* If we will deserialize make sure that during enumeration
 583          * this is already known, so we increase the counter here
 584          * already */
 585         if (serialization)
 586                 m->n_deserializing ++;
 587
 588         /* First, enumerate what we can from all config files */
 589         r = manager_enumerate(m);
 590
 591         /* Second, deserialize if there is something to deserialize */
 592         if (serialization)
 593                 if ((q = manager_deserialize(m, serialization, fds)) < 0)
 594                         r = q;
 595
 596         /* Third, fire things up! */
 597         if ((q = manager_coldplug(m)) < 0)
 598                 r = q;
 599
 600         if (serialization) {
 601                 assert(m->n_deserializing > 0);
 602                 m->n_deserializing --;
 603         }
 604
 605         return r;
 606 }
 607
 608 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
 609         assert(m);
 610         assert(j);
 611
 612         /* Deletes one job from the transaction */
 613
 614         manager_transaction_unlink_job(m, j, delete_dependencies);
 615
 616         if (!j->installed)
 617                 job_free(j);
 618 }
 619
 620 static void transaction_delete_unit(Manager *m, Unit *u) {
 621         Job *j;
 622
 623         /* Deletes all jobs associated with a certain unit from the
 624          * transaction */
 625
 626         while ((j = hashmap_get(m->transaction_jobs, u)))
 627                 transaction_delete_job(m, j, true);
 628 }
 629
 630 static void transaction_clean_dependencies(Manager *m) {
 631         Iterator i;
 632         Job *j;
 633
 634         assert(m);
 635
 636         /* Drops all dependencies of all installed jobs */
 637
 638         HASHMAP_FOREACH(j, m->jobs, i) {
 639                 while (j->subject_list)
 640                         job_dependency_free(j->subject_list);
 641                 while (j->object_list)
 642                         job_dependency_free(j->object_list);
 643         }
 644
 645         assert(!m->transaction_anchor);
 646 }
 647
 648 static void transaction_abort(Manager *m) {
 649         Job *j;
 650
 651         assert(m);
 652
 653         while ((j = hashmap_first(m->transaction_jobs)))
 654                 if (j->installed)
 655                         transaction_delete_job(m, j, true);
 656                 else
 657                         job_free(j);
 658
 659         assert(hashmap_isempty(m->transaction_jobs));
 660
 661         transaction_clean_dependencies(m);
 662 }
 663
 664 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
 665         JobDependency *l;
 666
 667         assert(m);
 668
 669         /* A recursive sweep through the graph that marks all units
 670          * that matter to the anchor job, i.e. are directly or
 671          * indirectly a dependency of the anchor job via paths that
 672          * are fully marked as mattering. */
 673
 674         if (j)
 675                 l = j->subject_list;
 676         else
 677                 l = m->transaction_anchor;
 678
 679         LIST_FOREACH(subject, l, l) {
 680
 681                 /* This link does not matter */
 682                 if (!l->matters)
 683                         continue;
 684
 685                 /* This unit has already been marked */
 686                 if (l->object->generation == generation)
 687                         continue;
 688
 689                 l->object->matters_to_anchor = true;
 690                 l->object->generation = generation;
 691
 692                 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
 693         }
 694 }
 695
 696 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
 697         JobDependency *l, *last;
 698
 699         assert(j);
 700         assert(other);
 701         assert(j->unit == other->unit);
 702         assert(!j->installed);
 703
 704         /* Merges 'other' into 'j' and then deletes j. */
 705
 706         j->type = t;
 707         j->state = JOB_WAITING;
 708         j->override = j->override || other->override;
 709
 710         j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
 711
 712         /* Patch us in as new owner of the JobDependency objects */
 713         last = NULL;
 714         LIST_FOREACH(subject, l, other->subject_list) {
 715                 assert(l->subject == other);
 716                 l->subject = j;
 717                 last = l;
 718         }
 719
 720         /* Merge both lists */
 721         if (last) {
 722                 last->subject_next = j->subject_list;
 723                 if (j->subject_list)
 724                         j->subject_list->subject_prev = last;
 725                 j->subject_list = other->subject_list;
 726         }
 727
 728         /* Patch us in as new owner of the JobDependency objects */
 729         last = NULL;
 730         LIST_FOREACH(object, l, other->object_list) {
 731                 assert(l->object == other);
 732                 l->object = j;
 733                 last = l;
 734         }
 735
 736         /* Merge both lists */
 737         if (last) {
 738                 last->object_next = j->object_list;
 739                 if (j->object_list)
 740                         j->object_list->object_prev = last;
 741                 j->object_list = other->object_list;
 742         }
 743
 744         /* Kill the other job */
 745         other->subject_list = NULL;
 746         other->object_list = NULL;
 747         transaction_delete_job(m, other, true);
 748 }
 749 static bool job_is_conflicted_by(Job *j) {
 750         JobDependency *l;
 751
 752         assert(j);
 753
 754         /* Returns true if this job is pulled in by a least one
 755          * ConflictedBy dependency. */
 756
 757         LIST_FOREACH(object, l, j->object_list)
 758                 if (l->conflicts)
 759                         return true;
 760
 761         return false;
 762 }
 763
 764 static int delete_one_unmergeable_job(Manager *m, Job *j) {
 765         Job *k;
 766
 767         assert(j);
 768
 769         /* Tries to delete one item in the linked list
 770          * j->transaction_next->transaction_next->... that conflicts
 771          * with another one, in an attempt to make an inconsistent
 772          * transaction work. */
 773
 774         /* We rely here on the fact that if a merged with b does not
 775          * merge with c, either a or b merge with c neither */
 776         LIST_FOREACH(transaction, j, j)
 777                 LIST_FOREACH(transaction, k, j->transaction_next) {
 778                         Job *d;
 779
 780                         /* Is this one mergeable? Then skip it */
 781                         if (job_type_is_mergeable(j->type, k->type))
 782                                 continue;
 783
 784                         /* Ok, we found two that conflict, let's see if we can
 785                          * drop one of them */
 786                         if (!j->matters_to_anchor && !k->matters_to_anchor) {
 787
 788                                 /* Both jobs don't matter, so let's
 789                                  * find the one that is smarter to
 790                                  * remove. Let's think positive and
 791                                  * rather remove stops then starts --
 792                                  * except if something is being
 793                                  * stopped because it is conflicted by
 794                                  * another unit in which case we
 795                                  * rather remove the start. */
 796
 797                                 log_debug("Looking at job %s/%s conflicted_by=%s", j->unit->meta.id, job_type_to_string(j->type), yes_no(j->type == JOB_STOP && job_is_conflicted_by(j)));
 798                                 log_debug("Looking at job %s/%s conflicted_by=%s", k->unit->meta.id, job_type_to_string(k->type), yes_no(k->type == JOB_STOP && job_is_conflicted_by(k)));
 799
 800                                 if (j->type == JOB_STOP) {
 801
 802                                         if (job_is_conflicted_by(j))
 803                                                 d = k;
 804                                         else
 805                                                 d = j;
 806
 807                                 } else if (k->type == JOB_STOP) {
 808
 809                                         if (job_is_conflicted_by(k))
 810                                                 d = j;
 811                                         else
 812                                                 d = k;
 813                                 } else
 814                                         d = j;
 815
 816                         } else if (!j->matters_to_anchor)
 817                                 d = j;
 818                         else if (!k->matters_to_anchor)
 819                                 d = k;
 820                         else
 821                                 return -ENOEXEC;
 822
 823                         /* Ok, we can drop one, so let's do so. */
 824                         log_debug("Fixing conflicting jobs by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
 825                         transaction_delete_job(m, d, true);
 826                         return 0;
 827                 }
 828
 829         return -EINVAL;
 830 }
 831
 832 static int transaction_merge_jobs(Manager *m, DBusError *e) {
 833         Job *j;
 834         Iterator i;
 835         int r;
 836
 837         assert(m);
 838
 839         /* First step, check whether any of the jobs for one specific
 840          * task conflict. If so, try to drop one of them. */
 841         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 842                 JobType t;
 843                 Job *k;
 844
 845                 t = j->type;
 846                 LIST_FOREACH(transaction, k, j->transaction_next) {
 847                         if (job_type_merge(&t, k->type) >= 0)
 848                                 continue;
 849
 850                         /* OK, we could not merge all jobs for this
 851                          * action. Let's see if we can get rid of one
 852                          * of them */
 853
 854                         if ((r = delete_one_unmergeable_job(m, j)) >= 0)
 855                                 /* Ok, we managed to drop one, now
 856                                  * let's ask our callers to call us
 857                                  * again after garbage collecting */
 858                                 return -EAGAIN;
 859
 860                         /* We couldn't merge anything. Failure */
 861                         dbus_set_error(e, BUS_ERROR_TRANSACTION_JOBS_CONFLICTING, "Transaction contains conflicting jobs '%s' and '%s' for %s. Probably contradicting requirement dependencies configured.",
 862                                        job_type_to_string(t), job_type_to_string(k->type), k->unit->meta.id);
 863                         return r;
 864                 }
 865         }
 866
 867         /* Second step, merge the jobs. */
 868         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 869                 JobType t = j->type;
 870                 Job *k;
 871
 872                 /* Merge all transactions */
 873                 LIST_FOREACH(transaction, k, j->transaction_next)
 874                         assert_se(job_type_merge(&t, k->type) == 0);
 875
 876                 /* If an active job is mergeable, merge it too */
 877                 if (j->unit->meta.job)
 878                         job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
 879
 880                 while ((k = j->transaction_next)) {
 881                         if (j->installed) {
 882                                 transaction_merge_and_delete_job(m, k, j, t);
 883                                 j = k;
 884                         } else
 885                                 transaction_merge_and_delete_job(m, j, k, t);
 886                 }
 887
 888                 assert(!j->transaction_next);
 889                 assert(!j->transaction_prev);
 890         }
 891
 892         return 0;
 893 }
 894
 895 static void transaction_drop_redundant(Manager *m) {
 896         bool again;
 897
 898         assert(m);
 899
 900         /* Goes through the transaction and removes all jobs that are
 901          * a noop */
 902
 903         do {
 904                 Job *j;
 905                 Iterator i;
 906
 907                 again = false;
 908
 909                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 910                         bool changes_something = false;
 911                         Job *k;
 912
 913                         LIST_FOREACH(transaction, k, j) {
 914
 915                                 if (!job_is_anchor(k) &&
 916                                     (k->installed || job_type_is_redundant(k->type, unit_active_state(k->unit))) &&
 917                                     (!k->unit->meta.job || !job_type_is_conflicting(k->type, k->unit->meta.job->type)))
 918                                         continue;
 919
 920                                 changes_something = true;
 921                                 break;
 922                         }
 923
 924                         if (changes_something)
 925                                 continue;
 926
 927                         /* log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type)); */
 928                         transaction_delete_job(m, j, false);
 929                         again = true;
 930                         break;
 931                 }
 932
 933         } while (again);
 934 }
 935
 936 static bool unit_matters_to_anchor(Unit *u, Job *j) {
 937         assert(u);
 938         assert(!j->transaction_prev);
 939
 940         /* Checks whether at least one of the jobs for this unit
 941          * matters to the anchor. */
 942
 943         LIST_FOREACH(transaction, j, j)
 944                 if (j->matters_to_anchor)
 945                         return true;
 946
 947         return false;
 948 }
 949
 950 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation, DBusError *e) {
 951         Iterator i;
 952         Unit *u;
 953         int r;
 954
 955         assert(m);
 956         assert(j);
 957         assert(!j->transaction_prev);
 958
 959         /* Does a recursive sweep through the ordering graph, looking
 960          * for a cycle. If we find cycle we try to break it. */
 961
 962         /* Have we seen this before? */
 963         if (j->generation == generation) {
 964                 Job *k, *delete;
 965
 966                 /* If the marker is NULL we have been here already and
 967                  * decided the job was loop-free from here. Hence
 968                  * shortcut things and return right-away. */
 969                 if (!j->marker)
 970                         return 0;
 971
 972                 /* So, the marker is not NULL and we already have been
 973                  * here. We have a cycle. Let's try to break it. We go
 974                  * backwards in our path and try to find a suitable
 975                  * job to remove. We use the marker to find our way
 976                  * back, since smart how we are we stored our way back
 977                  * in there. */
 978                 log_warning("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
 979
 980                 delete = NULL;
 981                 for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
 982
 983                         log_info("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
 984
 985                         if (!delete &&
 986                             !k->installed &&
 987                             !unit_matters_to_anchor(k->unit, k)) {
 988                                 /* Ok, we can drop this one, so let's
 989                                  * do so. */
 990                                 delete = k;
 991                         }
 992
 993                         /* Check if this in fact was the beginning of
 994                          * the cycle */
 995                         if (k == j)
 996                                 break;
 997                 }
 998
 999
1000                 if (delete) {
1001                         log_warning("Breaking ordering cycle by deleting job %s/%s", delete->unit->meta.id, job_type_to_string(delete->type));
1002                         transaction_delete_unit(m, delete->unit);
1003                         return -EAGAIN;
1004                 }
1005
1006                 log_error("Unable to break cycle");
1007
1008                 dbus_set_error(e, BUS_ERROR_TRANSACTION_ORDER_IS_CYCLIC, "Transaction order is cyclic. See system logs for details.");
1009                 return -ENOEXEC;
1010         }
1011
1012         /* Make the marker point to where we come from, so that we can
1013          * find our way backwards if we want to break a cycle. We use
1014          * a special marker for the beginning: we point to
1015          * ourselves. */
1016         j->marker = from ? from : j;
1017         j->generation = generation;
1018
1019         /* We assume that the the dependencies are bidirectional, and
1020          * hence can ignore UNIT_AFTER */
1021         SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
1022                 Job *o;
1023
1024                 /* Is there a job for this unit? */
1025                 if (!(o = hashmap_get(m->transaction_jobs, u)))
1026
1027                         /* Ok, there is no job for this in the
1028                          * transaction, but maybe there is already one
1029                          * running? */
1030                         if (!(o = u->meta.job))
1031                                 continue;
1032
1033                 if ((r = transaction_verify_order_one(m, o, j, generation, e)) < 0)
1034                         return r;
1035         }
1036
1037         /* Ok, let's backtrack, and remember that this entry is not on
1038          * our path anymore. */
1039         j->marker = NULL;
1040
1041         return 0;
1042 }
1043
1044 static int transaction_verify_order(Manager *m, unsigned *generation, DBusError *e) {
1045         Job *j;
1046         int r;
1047         Iterator i;
1048         unsigned g;
1049
1050         assert(m);
1051         assert(generation);
1052
1053         /* Check if the ordering graph is cyclic. If it is, try to fix
1054          * that up by dropping one of the jobs. */
1055
1056         g = (*generation)++;
1057
1058         HASHMAP_FOREACH(j, m->transaction_jobs, i)
1059                 if ((r = transaction_verify_order_one(m, j, NULL, g, e)) < 0)
1060                         return r;
1061
1062         return 0;
1063 }
1064
1065 static void transaction_collect_garbage(Manager *m) {
1066         bool again;
1067
1068         assert(m);
1069
1070         /* Drop jobs that are not required by any other job */
1071
1072         do {
1073                 Iterator i;
1074                 Job *j;
1075
1076                 again = false;
1077
1078                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1079                         if (j->object_list) {
1080                                 /* log_debug("Keeping job %s/%s because of %s/%s", */
1081                                 /*           j->unit->meta.id, job_type_to_string(j->type), */
1082                                 /*           j->object_list->subject ? j->object_list->subject->unit->meta.id : "root", */
1083                                 /*           j->object_list->subject ? job_type_to_string(j->object_list->subject->type) : "root"); */
1084                                 continue;
1085                         }
1086
1087                         /* log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type)); */
1088                         transaction_delete_job(m, j, true);
1089                         again = true;
1090                         break;
1091                 }
1092
1093         } while (again);
1094 }
1095
1096 static int transaction_is_destructive(Manager *m, DBusError *e) {
1097         Iterator i;
1098         Job *j;
1099
1100         assert(m);
1101
1102         /* Checks whether applying this transaction means that
1103          * existing jobs would be replaced */
1104
1105         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1106
1107                 /* Assume merged */
1108                 assert(!j->transaction_prev);
1109                 assert(!j->transaction_next);
1110
1111                 if (j->unit->meta.job &&
1112                     j->unit->meta.job != j &&
1113                     !job_type_is_superset(j->type, j->unit->meta.job->type)) {
1114
1115                         dbus_set_error(e, BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE, "Transaction is destructive.");
1116                         return -EEXIST;
1117                 }
1118         }
1119
1120         return 0;
1121 }
1122
1123 static void transaction_minimize_impact(Manager *m) {
1124         bool again;
1125         assert(m);
1126
1127         /* Drops all unnecessary jobs that reverse already active jobs
1128          * or that stop a running service. */
1129
1130         do {
1131                 Job *j;
1132                 Iterator i;
1133
1134                 again = false;
1135
1136                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1137                         LIST_FOREACH(transaction, j, j) {
1138                                 bool stops_running_service, changes_existing_job;
1139
1140                                 /* If it matters, we shouldn't drop it */
1141                                 if (j->matters_to_anchor)
1142                                         continue;
1143
1144                                 /* Would this stop a running service?
1145                                  * Would this change an existing job?
1146                                  * If so, let's drop this entry */
1147
1148                                 stops_running_service =
1149                                         j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1150
1151                                 changes_existing_job =
1152                                         j->unit->meta.job &&
1153                                         job_type_is_conflicting(j->type, j->unit->meta.job->type);
1154
1155                                 if (!stops_running_service && !changes_existing_job)
1156                                         continue;
1157
1158                                 if (stops_running_service)
1159                                         log_info("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1160
1161                                 if (changes_existing_job)
1162                                         log_info("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1163
1164                                 /* Ok, let's get rid of this */
1165                                 log_info("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1166
1167                                 transaction_delete_job(m, j, true);
1168                                 again = true;
1169                                 break;
1170                         }
1171
1172                         if (again)
1173                                 break;
1174                 }
1175
1176         } while (again);
1177 }
1178
1179 static int transaction_apply(Manager *m) {
1180         Iterator i;
1181         Job *j;
1182         int r;
1183
1184         /* Moves the transaction jobs to the set of active jobs */
1185
1186         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1187                 /* Assume merged */
1188                 assert(!j->transaction_prev);
1189                 assert(!j->transaction_next);
1190
1191                 if (j->installed)
1192                         continue;
1193
1194                 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1195                         goto rollback;
1196         }
1197
1198         while ((j = hashmap_steal_first(m->transaction_jobs))) {
1199                 if (j->installed) {
1200                         /* log_debug("Skipping already installed job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id); */
1201                         continue;
1202                 }
1203
1204                 if (j->unit->meta.job)
1205                         job_free(j->unit->meta.job);
1206
1207                 j->unit->meta.job = j;
1208                 j->installed = true;
1209                 m->n_installed_jobs ++;
1210
1211                 /* We're fully installed. Now let's free data we don't
1212                  * need anymore. */
1213
1214                 assert(!j->transaction_next);
1215                 assert(!j->transaction_prev);
1216
1217                 job_add_to_run_queue(j);
1218                 job_add_to_dbus_queue(j);
1219                 job_start_timer(j);
1220
1221                 log_debug("Installed new job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id);
1222         }
1223
1224         /* As last step, kill all remaining job dependencies. */
1225         transaction_clean_dependencies(m);
1226
1227         return 0;
1228
1229 rollback:
1230
1231         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1232                 if (j->installed)
1233                         continue;
1234
1235                 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1236         }
1237
1238         return r;
1239 }
1240
1241 static int transaction_activate(Manager *m, JobMode mode, DBusError *e) {
1242         int r;
1243         unsigned generation = 1;
1244
1245         assert(m);
1246
1247         /* This applies the changes recorded in transaction_jobs to
1248          * the actual list of jobs, if possible. */
1249
1250         /* First step: figure out which jobs matter */
1251         transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1252
1253         /* Second step: Try not to stop any running services if
1254          * we don't have to. Don't try to reverse running
1255          * jobs if we don't have to. */
1256         if (mode == JOB_FAIL)
1257                 transaction_minimize_impact(m);
1258
1259         /* Third step: Drop redundant jobs */
1260         transaction_drop_redundant(m);
1261
1262         for (;;) {
1263                 /* Fourth step: Let's remove unneeded jobs that might
1264                  * be lurking. */
1265                 transaction_collect_garbage(m);
1266
1267                 /* Fifth step: verify order makes sense and correct
1268                  * cycles if necessary and possible */
1269                 if ((r = transaction_verify_order(m, &generation, e)) >= 0)
1270                         break;
1271
1272                 if (r != -EAGAIN) {
1273                         log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r));
1274                         goto rollback;
1275                 }
1276
1277                 /* Let's see if the resulting transaction ordering
1278                  * graph is still cyclic... */
1279         }
1280
1281         for (;;) {
1282                 /* Sixth step: let's drop unmergeable entries if
1283                  * necessary and possible, merge entries we can
1284                  * merge */
1285                 if ((r = transaction_merge_jobs(m, e)) >= 0)
1286                         break;
1287
1288                 if (r != -EAGAIN) {
1289                         log_warning("Requested transaction contains unmergeable jobs: %s", bus_error(e, r));
1290                         goto rollback;
1291                 }
1292
1293                 /* Seventh step: an entry got dropped, let's garbage
1294                  * collect its dependencies. */
1295                 transaction_collect_garbage(m);
1296
1297                 /* Let's see if the resulting transaction still has
1298                  * unmergeable entries ... */
1299         }
1300
1301         /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1302         transaction_drop_redundant(m);
1303
1304         /* Ninth step: check whether we can actually apply this */
1305         if (mode == JOB_FAIL)
1306                 if ((r = transaction_is_destructive(m, e)) < 0) {
1307                         log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r));
1308                         goto rollback;
1309                 }
1310
1311         /* Tenth step: apply changes */
1312         if ((r = transaction_apply(m)) < 0) {
1313                 log_warning("Failed to apply transaction: %s", strerror(-r));
1314                 goto rollback;
1315         }
1316
1317         assert(hashmap_isempty(m->transaction_jobs));
1318         assert(!m->transaction_anchor);
1319
1320         return 0;
1321
1322 rollback:
1323         transaction_abort(m);
1324         return r;
1325 }
1326
1327 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1328         Job *j, *f;
1329
1330         assert(m);
1331         assert(unit);
1332
1333         /* Looks for an existing prospective job and returns that. If
1334          * it doesn't exist it is created and added to the prospective
1335          * jobs list. */
1336
1337         f = hashmap_get(m->transaction_jobs, unit);
1338
1339         LIST_FOREACH(transaction, j, f) {
1340                 assert(j->unit == unit);
1341
1342                 if (j->type == type) {
1343                         if (is_new)
1344                                 *is_new = false;
1345                         return j;
1346                 }
1347         }
1348
1349         if (unit->meta.job && unit->meta.job->type == type)
1350                 j = unit->meta.job;
1351         else if (!(j = job_new(m, type, unit)))
1352                 return NULL;
1353
1354         j->generation = 0;
1355         j->marker = NULL;
1356         j->matters_to_anchor = false;
1357         j->override = override;
1358
1359         LIST_PREPEND(Job, transaction, f, j);
1360
1361         if (hashmap_replace(m->transaction_jobs, unit, f) < 0) {
1362                 job_free(j);
1363                 return NULL;
1364         }
1365
1366         if (is_new)
1367                 *is_new = true;
1368
1369         /* log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type)); */
1370
1371         return j;
1372 }
1373
1374 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1375         assert(m);
1376         assert(j);
1377
1378         if (j->transaction_prev)
1379                 j->transaction_prev->transaction_next = j->transaction_next;
1380         else if (j->transaction_next)
1381                 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1382         else
1383                 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1384
1385         if (j->transaction_next)
1386                 j->transaction_next->transaction_prev = j->transaction_prev;
1387
1388         j->transaction_prev = j->transaction_next = NULL;
1389
1390         while (j->subject_list)
1391                 job_dependency_free(j->subject_list);
1392
1393         while (j->object_list) {
1394                 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1395
1396                 job_dependency_free(j->object_list);
1397
1398                 if (other && delete_dependencies) {
1399                         log_debug("Deleting job %s/%s as dependency of job %s/%s",
1400                                   other->unit->meta.id, job_type_to_string(other->type),
1401                                   j->unit->meta.id, job_type_to_string(j->type));
1402                         transaction_delete_job(m, other, delete_dependencies);
1403                 }
1404         }
1405 }
1406
1407 static int transaction_add_job_and_dependencies(
1408                 Manager *m,
1409                 JobType type,
1410                 Unit *unit,
1411                 Job *by,
1412                 bool matters,
1413                 bool override,
1414                 bool conflicts,
1415                 bool ignore_deps,
1416                 DBusError *e,
1417                 Job **_ret) {
1418         Job *ret;
1419         Iterator i;
1420         Unit *dep;
1421         int r;
1422         bool is_new;
1423
1424         assert(m);
1425         assert(type < _JOB_TYPE_MAX);
1426         assert(unit);
1427
1428         /* log_debug("Pulling in %s/%s from %s/%s", */
1429         /*           unit->meta.id, job_type_to_string(type), */
1430         /*           by ? by->unit->meta.id : "NA", */
1431         /*           by ? job_type_to_string(by->type) : "NA"); */
1432
1433         if (unit->meta.load_state != UNIT_LOADED &&
1434             unit->meta.load_state != UNIT_ERROR &&
1435             unit->meta.load_state != UNIT_MASKED) {
1436                 dbus_set_error(e, BUS_ERROR_LOAD_FAILED, "Unit %s is not loaded properly.", unit->meta.id);
1437                 return -EINVAL;
1438         }
1439
1440         if (type != JOB_STOP && unit->meta.load_state == UNIT_ERROR) {
1441                 dbus_set_error(e, BUS_ERROR_LOAD_FAILED,
1442                                "Unit %s failed to load: %s. "
1443                                "See system logs and 'systemctl status' for details.",
1444                                unit->meta.id,
1445                                strerror(-unit->meta.load_error));
1446                 return -EINVAL;
1447         }
1448
1449         if (type != JOB_STOP && unit->meta.load_state == UNIT_MASKED) {
1450                 dbus_set_error(e, BUS_ERROR_MASKED, "Unit %s is masked.", unit->meta.id);
1451                 return -EINVAL;
1452         }
1453
1454         if (!unit_job_is_applicable(unit, type)) {
1455                 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);
1456                 return -EBADR;
1457         }
1458
1459         /* First add the job. */
1460         if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1461                 return -ENOMEM;
1462
1463         ret->ignore_deps = ret->ignore_deps || ignore_deps;
1464
1465         /* Then, add a link to the job. */
1466         if (!job_dependency_new(by, ret, matters, conflicts))
1467                 return -ENOMEM;
1468
1469         if (is_new && !ignore_deps) {
1470                 Set *following;
1471
1472                 /* If we are following some other unit, make sure we
1473                  * add all dependencies of everybody following. */
1474                 if (unit_following_set(ret->unit, &following) > 0) {
1475                         SET_FOREACH(dep, following, i)
1476                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, false, override, false, false, e, NULL)) < 0) {
1477                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1478
1479                                         if (e)
1480                                                 dbus_error_free(e);
1481                                 }
1482
1483                         set_free(following);
1484                 }
1485
1486                 /* Finally, recursively add in all dependencies. */
1487                 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1488                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1489                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, e, NULL)) < 0) {
1490                                         if (r != -EBADR)
1491                                                 goto fail;
1492
1493                                         if (e)
1494                                                 dbus_error_free(e);
1495                                 }
1496
1497                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BIND_TO], i)
1498                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, e, NULL)) < 0) {
1499
1500                                         if (r != -EBADR)
1501                                                 goto fail;
1502
1503                                         if (e)
1504                                                 dbus_error_free(e);
1505                                 }
1506
1507                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1508                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, false, false, e, NULL)) < 0) {
1509                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1510
1511                                         if (e)
1512                                                 dbus_error_free(e);
1513                                 }
1514
1515                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1516                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, false, false, e, NULL)) < 0) {
1517                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1518
1519                                         if (e)
1520                                                 dbus_error_free(e);
1521                                 }
1522
1523                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1524                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, false, false, e, NULL)) < 0) {
1525
1526                                         if (r != -EBADR)
1527                                                 goto fail;
1528
1529                                         if (e)
1530                                                 dbus_error_free(e);
1531                                 }
1532
1533                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1534                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, false, e, NULL)) < 0) {
1535                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1536
1537                                         if (e)
1538                                                 dbus_error_free(e);
1539                                 }
1540
1541                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1542                                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, true, false, e, NULL)) < 0) {
1543
1544                                         if (r != -EBADR)
1545                                                 goto fail;
1546
1547                                         if (e)
1548                                                 dbus_error_free(e);
1549                                 }
1550
1551                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTED_BY], i)
1552                                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, false, override, false, false, e, NULL)) < 0) {
1553                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1554
1555                                         if (e)
1556                                                 dbus_error_free(e);
1557                                 }
1558
1559                 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1560
1561                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1562                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, e, NULL)) < 0) {
1563
1564                                         if (r != -EBADR)
1565                                                 goto fail;
1566
1567                                         if (e)
1568                                                 dbus_error_free(e);
1569                                 }
1570
1571                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BOUND_BY], i)
1572                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, e, NULL)) < 0) {
1573
1574                                         if (r != -EBADR)
1575                                                 goto fail;
1576
1577                                         if (e)
1578                                                 dbus_error_free(e);
1579                                 }
1580                 }
1581
1582                 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1583         }
1584
1585         if (_ret)
1586                 *_ret = ret;
1587
1588         return 0;
1589
1590 fail:
1591         return r;
1592 }
1593
1594 static int transaction_add_isolate_jobs(Manager *m) {
1595         Iterator i;
1596         Unit *u;
1597         char *k;
1598         int r;
1599
1600         assert(m);
1601
1602         HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1603
1604                 /* ignore aliases */
1605                 if (u->meta.id != k)
1606                         continue;
1607
1608                 if (UNIT_VTABLE(u)->no_isolate)
1609                         continue;
1610
1611                 /* No need to stop inactive jobs */
1612                 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)) && !u->meta.job)
1613                         continue;
1614
1615                 /* Is there already something listed for this? */
1616                 if (hashmap_get(m->transaction_jobs, u))
1617                         continue;
1618
1619                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, false, false, NULL, NULL)) < 0)
1620                         log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1621         }
1622
1623         return 0;
1624 }
1625
1626 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, DBusError *e, Job **_ret) {
1627         int r;
1628         Job *ret;
1629
1630         assert(m);
1631         assert(type < _JOB_TYPE_MAX);
1632         assert(unit);
1633         assert(mode < _JOB_MODE_MAX);
1634
1635         if (mode == JOB_ISOLATE && type != JOB_START) {
1636                 dbus_set_error(e, BUS_ERROR_INVALID_JOB_MODE, "Isolate is only valid for start.");
1637                 return -EINVAL;
1638         }
1639
1640         if (mode == JOB_ISOLATE && !unit->meta.allow_isolate) {
1641                 dbus_set_error(e, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
1642                 return -EPERM;
1643         }
1644
1645         log_debug("Trying to enqueue job %s/%s/%s", unit->meta.id, job_type_to_string(type), job_mode_to_string(mode));
1646
1647         if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, false, mode == JOB_IGNORE_DEPENDENCIES, e, &ret)) < 0) {
1648                 transaction_abort(m);
1649                 return r;
1650         }
1651
1652         if (mode == JOB_ISOLATE)
1653                 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1654                         transaction_abort(m);
1655                         return r;
1656                 }
1657
1658         if ((r = transaction_activate(m, mode, e)) < 0)
1659                 return r;
1660
1661         log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1662
1663         if (_ret)
1664                 *_ret = ret;
1665
1666         return 0;
1667 }
1668
1669 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, DBusError *e, Job **_ret) {
1670         Unit *unit;
1671         int r;
1672
1673         assert(m);
1674         assert(type < _JOB_TYPE_MAX);
1675         assert(name);
1676         assert(mode < _JOB_MODE_MAX);
1677
1678         if ((r = manager_load_unit(m, name, NULL, NULL, &unit)) < 0)
1679                 return r;
1680
1681         return manager_add_job(m, type, unit, mode, override, e, _ret);
1682 }
1683
1684 Job *manager_get_job(Manager *m, uint32_t id) {
1685         assert(m);
1686
1687         return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1688 }
1689
1690 Unit *manager_get_unit(Manager *m, const char *name) {
1691         assert(m);
1692         assert(name);
1693
1694         return hashmap_get(m->units, name);
1695 }
1696
1697 unsigned manager_dispatch_load_queue(Manager *m) {
1698         Meta *meta;
1699         unsigned n = 0;
1700
1701         assert(m);
1702
1703         /* Make sure we are not run recursively */
1704         if (m->dispatching_load_queue)
1705                 return 0;
1706
1707         m->dispatching_load_queue = true;
1708
1709         /* Dispatches the load queue. Takes a unit from the queue and
1710          * tries to load its data until the queue is empty */
1711
1712         while ((meta = m->load_queue)) {
1713                 assert(meta->in_load_queue);
1714
1715                 unit_load((Unit*) meta);
1716                 n++;
1717         }
1718
1719         m->dispatching_load_queue = false;
1720         return n;
1721 }
1722
1723 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1724         Unit *ret;
1725         int r;
1726
1727         assert(m);
1728         assert(name || path);
1729
1730         /* This will prepare the unit for loading, but not actually
1731          * load anything from disk. */
1732
1733         if (path && !is_path(path)) {
1734                 dbus_set_error(e, BUS_ERROR_INVALID_PATH, "Path %s is not absolute.", path);
1735                 return -EINVAL;
1736         }
1737
1738         if (!name)
1739                 name = file_name_from_path(path);
1740
1741         if (!unit_name_is_valid(name, false)) {
1742                 dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
1743                 return -EINVAL;
1744         }
1745
1746         if ((ret = manager_get_unit(m, name))) {
1747                 *_ret = ret;
1748                 return 1;
1749         }
1750
1751         if (!(ret = unit_new(m)))
1752                 return -ENOMEM;
1753
1754         if (path)
1755                 if (!(ret->meta.fragment_path = strdup(path))) {
1756                         unit_free(ret);
1757                         return -ENOMEM;
1758                 }
1759
1760         if ((r = unit_add_name(ret, name)) < 0) {
1761                 unit_free(ret);
1762                 return r;
1763         }
1764
1765         unit_add_to_load_queue(ret);
1766         unit_add_to_dbus_queue(ret);
1767         unit_add_to_gc_queue(ret);
1768
1769         if (_ret)
1770                 *_ret = ret;
1771
1772         return 0;
1773 }
1774
1775 int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1776         int r;
1777
1778         assert(m);
1779
1780         /* This will load the service information files, but not actually
1781          * start any services or anything. */
1782
1783         if ((r = manager_load_unit_prepare(m, name, path, e, _ret)) != 0)
1784                 return r;
1785
1786         manager_dispatch_load_queue(m);
1787
1788         if (_ret)
1789                 *_ret = unit_follow_merge(*_ret);
1790
1791         return 0;
1792 }
1793
1794 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1795         Iterator i;
1796         Job *j;
1797
1798         assert(s);
1799         assert(f);
1800
1801         HASHMAP_FOREACH(j, s->jobs, i)
1802                 job_dump(j, f, prefix);
1803 }
1804
1805 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1806         Iterator i;
1807         Unit *u;
1808         const char *t;
1809
1810         assert(s);
1811         assert(f);
1812
1813         HASHMAP_FOREACH_KEY(u, t, s->units, i)
1814                 if (u->meta.id == t)
1815                         unit_dump(u, f, prefix);
1816 }
1817
1818 void manager_clear_jobs(Manager *m) {
1819         Job *j;
1820
1821         assert(m);
1822
1823         transaction_abort(m);
1824
1825         while ((j = hashmap_first(m->jobs)))
1826                 job_finish_and_invalidate(j, JOB_CANCELED);
1827 }
1828
1829 unsigned manager_dispatch_run_queue(Manager *m) {
1830         Job *j;
1831         unsigned n = 0;
1832
1833         if (m->dispatching_run_queue)
1834                 return 0;
1835
1836         m->dispatching_run_queue = true;
1837
1838         while ((j = m->run_queue)) {
1839                 assert(j->installed);
1840                 assert(j->in_run_queue);
1841
1842                 job_run_and_invalidate(j);
1843                 n++;
1844         }
1845
1846         m->dispatching_run_queue = false;
1847         return n;
1848 }
1849
1850 unsigned manager_dispatch_dbus_queue(Manager *m) {
1851         Job *j;
1852         Meta *meta;
1853         unsigned n = 0;
1854
1855         assert(m);
1856
1857         if (m->dispatching_dbus_queue)
1858                 return 0;
1859
1860         m->dispatching_dbus_queue = true;
1861
1862         while ((meta = m->dbus_unit_queue)) {
1863                 assert(meta->in_dbus_queue);
1864
1865                 bus_unit_send_change_signal((Unit*) meta);
1866                 n++;
1867         }
1868
1869         while ((j = m->dbus_job_queue)) {
1870                 assert(j->in_dbus_queue);
1871
1872                 bus_job_send_change_signal(j);
1873                 n++;
1874         }
1875
1876         m->dispatching_dbus_queue = false;
1877         return n;
1878 }
1879
1880 static int manager_process_notify_fd(Manager *m) {
1881         ssize_t n;
1882
1883         assert(m);
1884
1885         for (;;) {
1886                 char buf[4096];
1887                 struct msghdr msghdr;
1888                 struct iovec iovec;
1889                 struct ucred *ucred;
1890                 union {
1891                         struct cmsghdr cmsghdr;
1892                         uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1893                 } control;
1894                 Unit *u;
1895                 char **tags;
1896
1897                 zero(iovec);
1898                 iovec.iov_base = buf;
1899                 iovec.iov_len = sizeof(buf)-1;
1900
1901                 zero(control);
1902                 zero(msghdr);
1903                 msghdr.msg_iov = &iovec;
1904                 msghdr.msg_iovlen = 1;
1905                 msghdr.msg_control = &control;
1906                 msghdr.msg_controllen = sizeof(control);
1907
1908                 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1909                         if (n >= 0)
1910                                 return -EIO;
1911
1912                         if (errno == EAGAIN || errno == EINTR)
1913                                 break;
1914
1915                         return -errno;
1916                 }
1917
1918                 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1919                     control.cmsghdr.cmsg_level != SOL_SOCKET ||
1920                     control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1921                     control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1922                         log_warning("Received notify message without credentials. Ignoring.");
1923                         continue;
1924                 }
1925
1926                 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1927
1928                 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(ucred->pid))))
1929                         if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1930                                 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1931                                 continue;
1932                         }
1933
1934                 assert((size_t) n < sizeof(buf));
1935                 buf[n] = 0;
1936                 if (!(tags = strv_split(buf, "\n\r")))
1937                         return -ENOMEM;
1938
1939                 log_debug("Got notification message for unit %s", u->meta.id);
1940
1941                 if (UNIT_VTABLE(u)->notify_message)
1942                         UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
1943
1944                 strv_free(tags);
1945         }
1946
1947         return 0;
1948 }
1949
1950 static int manager_dispatch_sigchld(Manager *m) {
1951         assert(m);
1952
1953         for (;;) {
1954                 siginfo_t si;
1955                 Unit *u;
1956                 int r;
1957
1958                 zero(si);
1959
1960                 /* First we call waitd() for a PID and do not reap the
1961                  * zombie. That way we can still access /proc/$PID for
1962                  * it while it is a zombie. */
1963                 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1964
1965                         if (errno == ECHILD)
1966                                 break;
1967
1968                         if (errno == EINTR)
1969                                 continue;
1970
1971                         return -errno;
1972                 }
1973
1974                 if (si.si_pid <= 0)
1975                         break;
1976
1977                 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
1978                         char *name = NULL;
1979
1980                         get_process_name(si.si_pid, &name);
1981                         log_debug("Got SIGCHLD for process %lu (%s)", (unsigned long) si.si_pid, strna(name));
1982                         free(name);
1983                 }
1984
1985                 /* Let's flush any message the dying child might still
1986                  * have queued for us. This ensures that the process
1987                  * still exists in /proc so that we can figure out
1988                  * which cgroup and hence unit it belongs to. */
1989                 if ((r = manager_process_notify_fd(m)) < 0)
1990                         return r;
1991
1992                 /* And now figure out the unit this belongs to */
1993                 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(si.si_pid))))
1994                         u = cgroup_unit_by_pid(m, si.si_pid);
1995
1996                 /* And now, we actually reap the zombie. */
1997                 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
1998                         if (errno == EINTR)
1999                                 continue;
2000
2001                         return -errno;
2002                 }
2003
2004                 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
2005                         continue;
2006
2007                 log_debug("Child %lu died (code=%s, status=%i/%s)",
2008                           (long unsigned) si.si_pid,
2009                           sigchld_code_to_string(si.si_code),
2010                           si.si_status,
2011                           strna(si.si_code == CLD_EXITED
2012                                 ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
2013                                 : signal_to_string(si.si_status)));
2014
2015                 if (!u)
2016                         continue;
2017
2018                 log_debug("Child %lu belongs to %s", (long unsigned) si.si_pid, u->meta.id);
2019
2020                 hashmap_remove(m->watch_pids, LONG_TO_PTR(si.si_pid));
2021                 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
2022         }
2023
2024         return 0;
2025 }
2026
2027 static int manager_start_target(Manager *m, const char *name, JobMode mode) {
2028         int r;
2029         DBusError error;
2030
2031         dbus_error_init(&error);
2032
2033         log_debug("Activating special unit %s", name);
2034
2035         if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL)) < 0)
2036                 log_error("Failed to enqueue %s job: %s", name, bus_error(&error, r));
2037
2038         dbus_error_free(&error);
2039
2040         return r;
2041 }
2042
2043 static int manager_process_signal_fd(Manager *m) {
2044         ssize_t n;
2045         struct signalfd_siginfo sfsi;
2046         bool sigchld = false;
2047
2048         assert(m);
2049
2050         for (;;) {
2051                 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
2052
2053                         if (n >= 0)
2054                                 return -EIO;
2055
2056                         if (errno == EINTR || errno == EAGAIN)
2057                                 break;
2058
2059                         return -errno;
2060                 }
2061
2062                 log_debug("Received SIG%s", strna(signal_to_string(sfsi.ssi_signo)));
2063
2064                 switch (sfsi.ssi_signo) {
2065
2066                 case SIGCHLD:
2067                         sigchld = true;
2068                         break;
2069
2070                 case SIGTERM:
2071                         if (m->running_as == MANAGER_SYSTEM) {
2072                                 /* This is for compatibility with the
2073                                  * original sysvinit */
2074                                 m->exit_code = MANAGER_REEXECUTE;
2075                                 break;
2076                         }
2077
2078                         /* Fall through */
2079
2080                 case SIGINT:
2081                         if (m->running_as == MANAGER_SYSTEM) {
2082                                 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
2083                                 break;
2084                         }
2085
2086                         /* Run the exit target if there is one, if not, just exit. */
2087                         if (manager_start_target(m, SPECIAL_EXIT_TARGET, JOB_REPLACE) < 0) {
2088                                 m->exit_code = MANAGER_EXIT;
2089                                 return 0;
2090                         }
2091
2092                         break;
2093
2094                 case SIGWINCH:
2095                         if (m->running_as == MANAGER_SYSTEM)
2096                                 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
2097
2098                         /* This is a nop on non-init */
2099                         break;
2100
2101                 case SIGPWR:
2102                         if (m->running_as == MANAGER_SYSTEM)
2103                                 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
2104
2105                         /* This is a nop on non-init */
2106                         break;
2107
2108                 case SIGUSR1: {
2109                         Unit *u;
2110
2111                         u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
2112
2113                         if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
2114                                 log_info("Trying to reconnect to bus...");
2115                                 bus_init(m, true);
2116                         }
2117
2118                         if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
2119                                 log_info("Loading D-Bus service...");
2120                                 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
2121                         }
2122
2123                         break;
2124                 }
2125
2126                 case SIGUSR2: {
2127                         FILE *f;
2128                         char *dump = NULL;
2129                         size_t size;
2130
2131                         if (!(f = open_memstream(&dump, &size))) {
2132                                 log_warning("Failed to allocate memory stream.");
2133                                 break;
2134                         }
2135
2136                         manager_dump_units(m, f, "\t");
2137                         manager_dump_jobs(m, f, "\t");
2138
2139                         if (ferror(f)) {
2140                                 fclose(f);
2141                                 free(dump);
2142                                 log_warning("Failed to write status stream");
2143                                 break;
2144                         }
2145
2146                         fclose(f);
2147                         log_dump(LOG_INFO, dump);
2148                         free(dump);
2149
2150                         break;
2151                 }
2152
2153                 case SIGHUP:
2154                         m->exit_code = MANAGER_RELOAD;
2155                         break;
2156
2157                 default: {
2158                         /* Starting SIGRTMIN+0 */
2159                         static const char * const target_table[] = {
2160                                 [0] = SPECIAL_DEFAULT_TARGET,
2161                                 [1] = SPECIAL_RESCUE_TARGET,
2162                                 [2] = SPECIAL_EMERGENCY_TARGET,
2163                                 [3] = SPECIAL_HALT_TARGET,
2164                                 [4] = SPECIAL_POWEROFF_TARGET,
2165                                 [5] = SPECIAL_REBOOT_TARGET,
2166                                 [6] = SPECIAL_KEXEC_TARGET
2167                         };
2168
2169                         /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
2170                         static const ManagerExitCode code_table[] = {
2171                                 [0] = MANAGER_HALT,
2172                                 [1] = MANAGER_POWEROFF,
2173                                 [2] = MANAGER_REBOOT,
2174                                 [3] = MANAGER_KEXEC
2175                         };
2176
2177                         if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
2178                             (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
2179                                 manager_start_target(m, target_table[sfsi.ssi_signo - SIGRTMIN],
2180                                                      (sfsi.ssi_signo == 1 || sfsi.ssi_signo == 2) ? JOB_ISOLATE : JOB_REPLACE);
2181                                 break;
2182                         }
2183
2184                         if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
2185                             (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(code_table)) {
2186                                 m->exit_code = code_table[sfsi.ssi_signo - SIGRTMIN - 13];
2187                                 break;
2188                         }
2189
2190                         switch (sfsi.ssi_signo - SIGRTMIN) {
2191
2192                         case 20:
2193                                 log_debug("Enabling showing of status.");
2194                                 m->show_status = true;
2195                                 break;
2196
2197                         case 21:
2198                                 log_debug("Disabling showing of status.");
2199                                 m->show_status = false;
2200                                 break;
2201
2202                         default:
2203                                 log_warning("Got unhandled signal <%s>.", strna(signal_to_string(sfsi.ssi_signo)));
2204                         }
2205                 }
2206                 }
2207         }
2208
2209         if (sigchld)
2210                 return manager_dispatch_sigchld(m);
2211
2212         return 0;
2213 }
2214
2215 static int process_event(Manager *m, struct epoll_event *ev) {
2216         int r;
2217         Watch *w;
2218
2219         assert(m);
2220         assert(ev);
2221
2222         assert(w = ev->data.ptr);
2223
2224         if (w->type == WATCH_INVALID)
2225                 return 0;
2226
2227         switch (w->type) {
2228
2229         case WATCH_SIGNAL:
2230
2231                 /* An incoming signal? */
2232                 if (ev->events != EPOLLIN)
2233                         return -EINVAL;
2234
2235                 if ((r = manager_process_signal_fd(m)) < 0)
2236                         return r;
2237
2238                 break;
2239
2240         case WATCH_NOTIFY:
2241
2242                 /* An incoming daemon notification event? */
2243                 if (ev->events != EPOLLIN)
2244                         return -EINVAL;
2245
2246                 if ((r = manager_process_notify_fd(m)) < 0)
2247                         return r;
2248
2249                 break;
2250
2251         case WATCH_FD:
2252
2253                 /* Some fd event, to be dispatched to the units */
2254                 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
2255                 break;
2256
2257         case WATCH_UNIT_TIMER:
2258         case WATCH_JOB_TIMER: {
2259                 uint64_t v;
2260                 ssize_t k;
2261
2262                 /* Some timer event, to be dispatched to the units */
2263                 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
2264
2265                         if (k < 0 && (errno == EINTR || errno == EAGAIN))
2266                                 break;
2267
2268                         return k < 0 ? -errno : -EIO;
2269                 }
2270
2271                 if (w->type == WATCH_UNIT_TIMER)
2272                         UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
2273                 else
2274                         job_timer_event(w->data.job, v, w);
2275                 break;
2276         }
2277
2278         case WATCH_MOUNT:
2279                 /* Some mount table change, intended for the mount subsystem */
2280                 mount_fd_event(m, ev->events);
2281                 break;
2282
2283         case WATCH_SWAP:
2284                 /* Some swap table change, intended for the swap subsystem */
2285                 swap_fd_event(m, ev->events);
2286                 break;
2287
2288         case WATCH_UDEV:
2289                 /* Some notification from udev, intended for the device subsystem */
2290                 device_fd_event(m, ev->events);
2291                 break;
2292
2293         case WATCH_DBUS_WATCH:
2294                 bus_watch_event(m, w, ev->events);
2295                 break;
2296
2297         case WATCH_DBUS_TIMEOUT:
2298                 bus_timeout_event(m, w, ev->events);
2299                 break;
2300
2301         default:
2302                 log_error("event type=%i", w->type);
2303                 assert_not_reached("Unknown epoll event type.");
2304         }
2305
2306         return 0;
2307 }
2308
2309 int manager_loop(Manager *m) {
2310         int r;
2311
2312         RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
2313
2314         assert(m);
2315         m->exit_code = MANAGER_RUNNING;
2316
2317         /* Release the path cache */
2318         set_free_free(m->unit_path_cache);
2319         m->unit_path_cache = NULL;
2320
2321         manager_check_finished(m);
2322
2323         /* There might still be some zombies hanging around from
2324          * before we were exec()'ed. Leat's reap them */
2325         if ((r = manager_dispatch_sigchld(m)) < 0)
2326                 return r;
2327
2328         while (m->exit_code == MANAGER_RUNNING) {
2329                 struct epoll_event event;
2330                 int n;
2331
2332                 if (!ratelimit_test(&rl)) {
2333                         /* Yay, something is going seriously wrong, pause a little */
2334                         log_warning("Looping too fast. Throttling execution a little.");
2335                         sleep(1);
2336                 }
2337
2338                 if (manager_dispatch_load_queue(m) > 0)
2339                         continue;
2340
2341                 if (manager_dispatch_run_queue(m) > 0)
2342                         continue;
2343
2344                 if (bus_dispatch(m) > 0)
2345                         continue;
2346
2347                 if (manager_dispatch_cleanup_queue(m) > 0)
2348                         continue;
2349
2350                 if (manager_dispatch_gc_queue(m) > 0)
2351                         continue;
2352
2353                 if (manager_dispatch_dbus_queue(m) > 0)
2354                         continue;
2355
2356                 if (swap_dispatch_reload(m) > 0)
2357                         continue;
2358
2359                 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2360
2361                         if (errno == EINTR)
2362                                 continue;
2363
2364                         return -errno;
2365                 }
2366
2367                 assert(n == 1);
2368
2369                 if ((r = process_event(m, &event)) < 0)
2370                         return r;
2371         }
2372
2373         return m->exit_code;
2374 }
2375
2376 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2377         char *n;
2378         Unit *u;
2379
2380         assert(m);
2381         assert(s);
2382         assert(_u);
2383
2384         if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2385                 return -EINVAL;
2386
2387         if (!(n = bus_path_unescape(s+31)))
2388                 return -ENOMEM;
2389
2390         u = manager_get_unit(m, n);
2391         free(n);
2392
2393         if (!u)
2394                 return -ENOENT;
2395
2396         *_u = u;
2397
2398         return 0;
2399 }
2400
2401 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2402         Job *j;
2403         unsigned id;
2404         int r;
2405
2406         assert(m);
2407         assert(s);
2408         assert(_j);
2409
2410         if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2411                 return -EINVAL;
2412
2413         if ((r = safe_atou(s + 30, &id)) < 0)
2414                 return r;
2415
2416         if (!(j = manager_get_job(m, id)))
2417                 return -ENOENT;
2418
2419         *_j = j;
2420
2421         return 0;
2422 }
2423
2424 void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
2425
2426 #ifdef HAVE_AUDIT
2427         char *p;
2428
2429         if (m->audit_fd < 0)
2430                 return;
2431
2432         /* Don't generate audit events if the service was already
2433          * started and we're just deserializing */
2434         if (m->n_deserializing > 0)
2435                 return;
2436
2437         if (!(p = unit_name_to_prefix_and_instance(u->meta.id))) {
2438                 log_error("Failed to allocate unit name for audit message: %s", strerror(ENOMEM));
2439                 return;
2440         }
2441
2442         if (audit_log_user_comm_message(m->audit_fd, type, "", p, NULL, NULL, NULL, success) < 0)
2443                 log_error("Failed to send audit message: %m");
2444
2445         free(p);
2446 #endif
2447
2448 }
2449
2450 void manager_send_unit_plymouth(Manager *m, Unit *u) {
2451         int fd = -1;
2452         union sockaddr_union sa;
2453         int n = 0;
2454         char *message = NULL;
2455
2456         /* Don't generate plymouth events if the service was already
2457          * started and we're just deserializing */
2458         if (m->n_deserializing > 0)
2459                 return;
2460
2461         if (m->running_as != MANAGER_SYSTEM)
2462                 return;
2463
2464         if (u->meta.type != UNIT_SERVICE &&
2465             u->meta.type != UNIT_MOUNT &&
2466             u->meta.type != UNIT_SWAP)
2467                 return;
2468
2469         /* We set SOCK_NONBLOCK here so that we rather drop the
2470          * message then wait for plymouth */
2471         if ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
2472                 log_error("socket() failed: %m");
2473                 return;
2474         }
2475
2476         zero(sa);
2477         sa.sa.sa_family = AF_UNIX;
2478         strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
2479         if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
2480
2481                 if (errno != EPIPE &&
2482                     errno != EAGAIN &&
2483                     errno != ENOENT &&
2484                     errno != ECONNREFUSED &&
2485                     errno != ECONNRESET &&
2486                     errno != ECONNABORTED)
2487                         log_error("connect() failed: %m");
2488
2489                 goto finish;
2490         }
2491
2492         if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->meta.id) + 1), u->meta.id, &n) < 0) {
2493                 log_error("Out of memory");
2494                 goto finish;
2495         }
2496
2497         errno = 0;
2498         if (write(fd, message, n + 1) != n + 1) {
2499
2500                 if (errno != EPIPE &&
2501                     errno != EAGAIN &&
2502                     errno != ENOENT &&
2503                     errno != ECONNREFUSED &&
2504                     errno != ECONNRESET &&
2505                     errno != ECONNABORTED)
2506                         log_error("Failed to write Plymouth message: %m");
2507
2508                 goto finish;
2509         }
2510
2511 finish:
2512         if (fd >= 0)
2513                 close_nointr_nofail(fd);
2514
2515         free(message);
2516 }
2517
2518 void manager_dispatch_bus_name_owner_changed(
2519                 Manager *m,
2520                 const char *name,
2521                 const char* old_owner,
2522                 const char *new_owner) {
2523
2524         Unit *u;
2525
2526         assert(m);
2527         assert(name);
2528
2529         if (!(u = hashmap_get(m->watch_bus, name)))
2530                 return;
2531
2532         UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2533 }
2534
2535 void manager_dispatch_bus_query_pid_done(
2536                 Manager *m,
2537                 const char *name,
2538                 pid_t pid) {
2539
2540         Unit *u;
2541
2542         assert(m);
2543         assert(name);
2544         assert(pid >= 1);
2545
2546         if (!(u = hashmap_get(m->watch_bus, name)))
2547                 return;
2548
2549         UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2550 }
2551
2552 int manager_open_serialization(Manager *m, FILE **_f) {
2553         char *path;
2554         mode_t saved_umask;
2555         int fd;
2556         FILE *f;
2557
2558         assert(_f);
2559
2560         if (m->running_as == MANAGER_SYSTEM) {
2561                 mkdir_p("/dev/.systemd", 0755);
2562
2563                 if (asprintf(&path, "/dev/.systemd/dump-%lu-XXXXXX", (unsigned long) getpid()) < 0)
2564                         return -ENOMEM;
2565         } else {
2566                 if (asprintf(&path, "/tmp/systemd-dump-%lu-XXXXXX", (unsigned long) getpid()) < 0)
2567                         return -ENOMEM;
2568         }
2569
2570         saved_umask = umask(0077);
2571         fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2572         umask(saved_umask);
2573
2574         if (fd < 0) {
2575                 free(path);
2576                 return -errno;
2577         }
2578
2579         unlink(path);
2580
2581         log_debug("Serializing state to %s", path);
2582         free(path);
2583
2584         if (!(f = fdopen(fd, "w+")) < 0)
2585                 return -errno;
2586
2587         *_f = f;
2588
2589         return 0;
2590 }
2591
2592 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2593         Iterator i;
2594         Unit *u;
2595         const char *t;
2596         int r;
2597
2598         assert(m);
2599         assert(f);
2600         assert(fds);
2601
2602         dual_timestamp_serialize(f, "initrd-timestamp", &m->initrd_timestamp);
2603         dual_timestamp_serialize(f, "startup-timestamp", &m->startup_timestamp);
2604         dual_timestamp_serialize(f, "finish-timestamp", &m->finish_timestamp);
2605
2606         fputc('\n', f);
2607
2608         HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2609                 if (u->meta.id != t)
2610                         continue;
2611
2612                 if (!unit_can_serialize(u))
2613                         continue;
2614
2615                 /* Start marker */
2616                 fputs(u->meta.id, f);
2617                 fputc('\n', f);
2618
2619                 if ((r = unit_serialize(u, f, fds)) < 0)
2620                         return r;
2621         }
2622
2623         if (ferror(f))
2624                 return -EIO;
2625
2626         return 0;
2627 }
2628
2629 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2630         int r = 0;
2631
2632         assert(m);
2633         assert(f);
2634
2635         log_debug("Deserializing state...");
2636
2637         m->n_deserializing ++;
2638
2639         for (;;) {
2640                 char line[1024], *l;
2641
2642                 if (!fgets(line, sizeof(line), f)) {
2643                         if (feof(f))
2644                                 r = 0;
2645                         else
2646                                 r = -errno;
2647
2648                         goto finish;
2649                 }
2650
2651                 char_array_0(line);
2652                 l = strstrip(line);
2653
2654                 if (l[0] == 0)
2655                         break;
2656
2657                 if (startswith(l, "initrd-timestamp="))
2658                         dual_timestamp_deserialize(l+17, &m->initrd_timestamp);
2659                 else if (startswith(l, "startup-timestamp="))
2660                         dual_timestamp_deserialize(l+18, &m->startup_timestamp);
2661                 else if (startswith(l, "finish-timestamp="))
2662                         dual_timestamp_deserialize(l+17, &m->finish_timestamp);
2663                 else
2664                         log_debug("Unknown serialization item '%s'", l);
2665         }
2666
2667         for (;;) {
2668                 Unit *u;
2669                 char name[UNIT_NAME_MAX+2];
2670
2671                 /* Start marker */
2672                 if (!fgets(name, sizeof(name), f)) {
2673                         if (feof(f))
2674                                 r = 0;
2675                         else
2676                                 r = -errno;
2677
2678                         goto finish;
2679                 }
2680
2681                 char_array_0(name);
2682
2683                 if ((r = manager_load_unit(m, strstrip(name), NULL, NULL, &u)) < 0)
2684                         goto finish;
2685
2686                 if ((r = unit_deserialize(u, f, fds)) < 0)
2687                         goto finish;
2688         }
2689
2690 finish:
2691         if (ferror(f)) {
2692                 r = -EIO;
2693                 goto finish;
2694         }
2695
2696         assert(m->n_deserializing > 0);
2697         m->n_deserializing --;
2698
2699         return r;
2700 }
2701
2702 int manager_reload(Manager *m) {
2703         int r, q;
2704         FILE *f;
2705         FDSet *fds;
2706
2707         assert(m);
2708
2709         if ((r = manager_open_serialization(m, &f)) < 0)
2710                 return r;
2711
2712         if (!(fds = fdset_new())) {
2713                 r = -ENOMEM;
2714                 goto finish;
2715         }
2716
2717         if ((r = manager_serialize(m, f, fds)) < 0)
2718                 goto finish;
2719
2720         if (fseeko(f, 0, SEEK_SET) < 0) {
2721                 r = -errno;
2722                 goto finish;
2723         }
2724
2725         /* From here on there is no way back. */
2726         manager_clear_jobs_and_units(m);
2727         manager_undo_generators(m);
2728
2729         /* Find new unit paths */
2730         lookup_paths_free(&m->lookup_paths);
2731         if ((q = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
2732                 r = q;
2733
2734         manager_run_generators(m);
2735
2736         manager_build_unit_path_cache(m);
2737
2738         m->n_deserializing ++;
2739
2740         /* First, enumerate what we can from all config files */
2741         if ((q = manager_enumerate(m)) < 0)
2742                 r = q;
2743
2744         /* Second, deserialize our stored data */
2745         if ((q = manager_deserialize(m, f, fds)) < 0)
2746                 r = q;
2747
2748         fclose(f);
2749         f = NULL;
2750
2751         /* Third, fire things up! */
2752         if ((q = manager_coldplug(m)) < 0)
2753                 r = q;
2754
2755         assert(m->n_deserializing > 0);
2756         m->n_deserializing ++;
2757
2758 finish:
2759         if (f)
2760                 fclose(f);
2761
2762         if (fds)
2763                 fdset_free(fds);
2764
2765         return r;
2766 }
2767
2768 bool manager_is_booting_or_shutting_down(Manager *m) {
2769         Unit *u;
2770
2771         assert(m);
2772
2773         /* Is the initial job still around? */
2774         if (manager_get_job(m, 1))
2775                 return true;
2776
2777         /* Is there a job for the shutdown target? */
2778         if (((u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET))))
2779                 return !!u->meta.job;
2780
2781         return false;
2782 }
2783
2784 void manager_reset_failed(Manager *m) {
2785         Unit *u;
2786         Iterator i;
2787
2788         assert(m);
2789
2790         HASHMAP_FOREACH(u, m->units, i)
2791                 unit_reset_failed(u);
2792 }
2793
2794 bool manager_unit_pending_inactive(Manager *m, const char *name) {
2795         Unit *u;
2796
2797         assert(m);
2798         assert(name);
2799
2800         /* Returns true if the unit is inactive or going down */
2801         if (!(u = manager_get_unit(m, name)))
2802                 return true;
2803
2804         return unit_pending_inactive(u);
2805 }
2806
2807 void manager_check_finished(Manager *m) {
2808         char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX];
2809
2810         assert(m);
2811
2812         if (dual_timestamp_is_set(&m->finish_timestamp))
2813                 return;
2814
2815         if (hashmap_size(m->jobs) > 0)
2816                 return;
2817
2818         dual_timestamp_get(&m->finish_timestamp);
2819
2820         if (m->running_as == MANAGER_SYSTEM) {
2821                 if (dual_timestamp_is_set(&m->initrd_timestamp)) {
2822                         log_info("Startup finished in %s (kernel) + %s (initrd) + %s (userspace) = %s.",
2823                                  format_timespan(kernel, sizeof(kernel),
2824                                                  m->initrd_timestamp.monotonic),
2825                                  format_timespan(initrd, sizeof(initrd),
2826                                                  m->startup_timestamp.monotonic - m->initrd_timestamp.monotonic),
2827                                  format_timespan(userspace, sizeof(userspace),
2828                                                  m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2829                                  format_timespan(sum, sizeof(sum),
2830                                                  m->finish_timestamp.monotonic));
2831                 } else
2832                         log_info("Startup finished in %s (kernel) + %s (userspace) = %s.",
2833                                  format_timespan(kernel, sizeof(kernel),
2834                                                  m->startup_timestamp.monotonic),
2835                                  format_timespan(userspace, sizeof(userspace),
2836                                                  m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2837                                  format_timespan(sum, sizeof(sum),
2838                                                  m->finish_timestamp.monotonic));
2839         } else
2840                 log_debug("Startup finished in %s.",
2841                           format_timespan(userspace, sizeof(userspace),
2842                                           m->finish_timestamp.monotonic - m->startup_timestamp.monotonic));
2843
2844 }
2845
2846 void manager_run_generators(Manager *m) {
2847         DIR *d = NULL;
2848         const char *generator_path;
2849         const char *argv[3];
2850
2851         assert(m);
2852
2853         generator_path = m->running_as == MANAGER_SYSTEM ? SYSTEM_GENERATOR_PATH : USER_GENERATOR_PATH;
2854         if (!(d = opendir(generator_path))) {
2855
2856                 if (errno == ENOENT)
2857                         return;
2858
2859                 log_error("Failed to enumerate generator directory: %m");
2860                 return;
2861         }
2862
2863         if (!m->generator_unit_path) {
2864                 char *p;
2865                 char system_path[] = "/dev/.systemd/generator-XXXXXX",
2866                         user_path[] = "/tmp/systemd-generator-XXXXXX";
2867
2868                 if (!(p = mkdtemp(m->running_as == MANAGER_SYSTEM ? system_path : user_path))) {
2869                         log_error("Failed to generate generator directory: %m");
2870                         goto finish;
2871                 }
2872
2873                 if (!(m->generator_unit_path = strdup(p))) {
2874                         log_error("Failed to allocate generator unit path.");
2875                         goto finish;
2876                 }
2877         }
2878
2879         argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */
2880         argv[1] = m->generator_unit_path;
2881         argv[2] = NULL;
2882
2883         execute_directory(generator_path, d, (char**) argv);
2884
2885         if (rmdir(m->generator_unit_path) >= 0) {
2886                 /* Uh? we were able to remove this dir? I guess that
2887                  * means the directory was empty, hence let's shortcut
2888                  * this */
2889
2890                 free(m->generator_unit_path);
2891                 m->generator_unit_path = NULL;
2892                 goto finish;
2893         }
2894
2895         if (!strv_find(m->lookup_paths.unit_path, m->generator_unit_path)) {
2896                 char **l;
2897
2898                 if (!(l = strv_append(m->lookup_paths.unit_path, m->generator_unit_path))) {
2899                         log_error("Failed to add generator directory to unit search path: %m");
2900                         goto finish;
2901                 }
2902
2903                 strv_free(m->lookup_paths.unit_path);
2904                 m->lookup_paths.unit_path = l;
2905
2906                 log_debug("Added generator unit path %s to search path.", m->generator_unit_path);
2907         }
2908
2909 finish:
2910         if (d)
2911                 closedir(d);
2912 }
2913
2914 void manager_undo_generators(Manager *m) {
2915         assert(m);
2916
2917         if (!m->generator_unit_path)
2918                 return;
2919
2920         strv_remove(m->lookup_paths.unit_path, m->generator_unit_path);
2921         rm_rf(m->generator_unit_path, false, true);
2922
2923         free(m->generator_unit_path);
2924         m->generator_unit_path = NULL;
2925 }
2926
2927 int manager_set_default_controllers(Manager *m, char **controllers) {
2928         char **l;
2929
2930         assert(m);
2931
2932         if (!(l = strv_copy(controllers)))
2933                 return -ENOMEM;
2934
2935         strv_free(m->default_controllers);
2936         m->default_controllers = l;
2937
2938         return 0;
2939 }
2940
2941 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
2942         [MANAGER_SYSTEM] = "system",
2943         [MANAGER_USER] = "user"
2944 };
2945
2946 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);