src/manager.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <assert.h>
  23 #include <errno.h>
  24 #include <string.h>
  25 #include <sys/epoll.h>
  26 #include <signal.h>
  27 #include <sys/signalfd.h>
  28 #include <sys/wait.h>
  29 #include <unistd.h>
  30 #include <sys/poll.h>
  31 #include <sys/reboot.h>
  32 #include <sys/ioctl.h>
  33 #include <linux/kd.h>
  34 #include <termios.h>
  35 #include <fcntl.h>
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 #include <dirent.h>
  39
  40 #ifdef HAVE_AUDIT
  41 #include <libaudit.h>
  42 #endif
  43
  44 #include "manager.h"
  45 #include "hashmap.h"
  46 #include "macro.h"
  47 #include "strv.h"
  48 #include "log.h"
  49 #include "util.h"
  50 #include "ratelimit.h"
  51 #include "cgroup.h"
  52 #include "mount-setup.h"
  53 #include "unit-name.h"
  54 #include "dbus-unit.h"
  55 #include "dbus-job.h"
  56 #include "missing.h"
  57 #include "path-lookup.h"
  58 #include "special.h"
  59 #include "bus-errors.h"
  60 #include "exit-status.h"
  61
  62 /* As soon as 16 units are in our GC queue, make sure to run a gc sweep */
  63 #define GC_QUEUE_ENTRIES_MAX 16
  64
  65 /* As soon as 5s passed since a unit was added to our GC queue, make sure to run a gc sweep */
  66 #define GC_QUEUE_USEC_MAX (10*USEC_PER_SEC)
  67
  68 /* Where clients shall send notification messages to */
  69 #define NOTIFY_SOCKET_SYSTEM "/run/systemd/notify"
  70 #define NOTIFY_SOCKET_USER "@/org/freedesktop/systemd1/notify"
  71
  72 static int manager_setup_notify(Manager *m) {
  73         union {
  74                 struct sockaddr sa;
  75                 struct sockaddr_un un;
  76         } sa;
  77         struct epoll_event ev;
  78         int one = 1;
  79
  80         assert(m);
  81
  82         m->notify_watch.type = WATCH_NOTIFY;
  83         if ((m->notify_watch.fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
  84                 log_error("Failed to allocate notification socket: %m");
  85                 return -errno;
  86         }
  87
  88         zero(sa);
  89         sa.sa.sa_family = AF_UNIX;
  90
  91         if (getpid() != 1)
  92                 snprintf(sa.un.sun_path, sizeof(sa.un.sun_path), NOTIFY_SOCKET_USER "/%llu", random_ull());
  93         else {
  94                 unlink(NOTIFY_SOCKET_SYSTEM);
  95                 strncpy(sa.un.sun_path, NOTIFY_SOCKET_SYSTEM, sizeof(sa.un.sun_path));
  96         }
  97
  98         if (sa.un.sun_path[0] == '@')
  99                 sa.un.sun_path[0] = 0;
 100
 101         if (bind(m->notify_watch.fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
 102                 log_error("bind() failed: %m");
 103                 return -errno;
 104         }
 105
 106         if (setsockopt(m->notify_watch.fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
 107                 log_error("SO_PASSCRED failed: %m");
 108                 return -errno;
 109         }
 110
 111         zero(ev);
 112         ev.events = EPOLLIN;
 113         ev.data.ptr = &m->notify_watch;
 114
 115         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->notify_watch.fd, &ev) < 0)
 116                 return -errno;
 117
 118         if (sa.un.sun_path[0] == 0)
 119                 sa.un.sun_path[0] = '@';
 120
 121         if (!(m->notify_socket = strdup(sa.un.sun_path)))
 122                 return -ENOMEM;
 123
 124         log_debug("Using notification socket %s", m->notify_socket);
 125
 126         return 0;
 127 }
 128
 129 static int enable_special_signals(Manager *m) {
 130         int fd;
 131
 132         assert(m);
 133
 134         /* Enable that we get SIGINT on control-alt-del */
 135         if (reboot(RB_DISABLE_CAD) < 0)
 136                 log_warning("Failed to enable ctrl-alt-del handling: %m");
 137
 138         if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY)) < 0)
 139                 log_warning("Failed to open /dev/tty0: %m");
 140         else {
 141                 /* Enable that we get SIGWINCH on kbrequest */
 142                 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
 143                         log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
 144
 145                 close_nointr_nofail(fd);
 146         }
 147
 148         return 0;
 149 }
 150
 151 static int manager_setup_signals(Manager *m) {
 152         sigset_t mask;
 153         struct epoll_event ev;
 154         struct sigaction sa;
 155
 156         assert(m);
 157
 158         /* We are not interested in SIGSTOP and friends. */
 159         zero(sa);
 160         sa.sa_handler = SIG_DFL;
 161         sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
 162         assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 163
 164         assert_se(sigemptyset(&mask) == 0);
 165
 166         sigset_add_many(&mask,
 167                         SIGCHLD,     /* Child died */
 168                         SIGTERM,     /* Reexecute daemon */
 169                         SIGHUP,      /* Reload configuration */
 170                         SIGUSR1,     /* systemd/upstart: reconnect to D-Bus */
 171                         SIGUSR2,     /* systemd: dump status */
 172                         SIGINT,      /* Kernel sends us this on control-alt-del */
 173                         SIGWINCH,    /* Kernel sends us this on kbrequest (alt-arrowup) */
 174                         SIGPWR,      /* Some kernel drivers and upsd send us this on power failure */
 175                         SIGRTMIN+0,  /* systemd: start default.target */
 176                         SIGRTMIN+1,  /* systemd: isolate rescue.target */
 177                         SIGRTMIN+2,  /* systemd: isolate emergency.target */
 178                         SIGRTMIN+3,  /* systemd: start halt.target */
 179                         SIGRTMIN+4,  /* systemd: start poweroff.target */
 180                         SIGRTMIN+5,  /* systemd: start reboot.target */
 181                         SIGRTMIN+6,  /* systemd: start kexec.target */
 182                         SIGRTMIN+13, /* systemd: Immediate halt */
 183                         SIGRTMIN+14, /* systemd: Immediate poweroff */
 184                         SIGRTMIN+15, /* systemd: Immediate reboot */
 185                         SIGRTMIN+16, /* systemd: Immediate kexec */
 186                         SIGRTMIN+20, /* systemd: enable status messages */
 187                         SIGRTMIN+21, /* systemd: disable status messages */
 188                         -1);
 189         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
 190
 191         m->signal_watch.type = WATCH_SIGNAL;
 192         if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
 193                 return -errno;
 194
 195         zero(ev);
 196         ev.events = EPOLLIN;
 197         ev.data.ptr = &m->signal_watch;
 198
 199         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
 200                 return -errno;
 201
 202         if (m->running_as == MANAGER_SYSTEM)
 203                 return enable_special_signals(m);
 204
 205         return 0;
 206 }
 207
 208 int manager_new(ManagerRunningAs running_as, Manager **_m) {
 209         Manager *m;
 210         int r = -ENOMEM;
 211
 212         assert(_m);
 213         assert(running_as >= 0);
 214         assert(running_as < _MANAGER_RUNNING_AS_MAX);
 215
 216         if (!(m = new0(Manager, 1)))
 217                 return -ENOMEM;
 218
 219         dual_timestamp_get(&m->startup_timestamp);
 220
 221         m->running_as = running_as;
 222         m->name_data_slot = m->subscribed_data_slot = -1;
 223         m->exit_code = _MANAGER_EXIT_CODE_INVALID;
 224         m->pin_cgroupfs_fd = -1;
 225
 226 #ifdef HAVE_AUDIT
 227         m->audit_fd = -1;
 228 #endif
 229
 230         m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = m->swap_watch.fd = -1;
 231         m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
 232
 233         if (!(m->environment = strv_copy(environ)))
 234                 goto fail;
 235
 236         if (!(m->default_controllers = strv_new("cpu", NULL)))
 237                 goto fail;
 238
 239         if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
 240                 goto fail;
 241
 242         if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
 243                 goto fail;
 244
 245         if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
 246                 goto fail;
 247
 248         if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
 249                 goto fail;
 250
 251         if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
 252                 goto fail;
 253
 254         if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
 255                 goto fail;
 256
 257         if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
 258                 goto fail;
 259
 260         if ((r = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
 261                 goto fail;
 262
 263         if ((r = manager_setup_signals(m)) < 0)
 264                 goto fail;
 265
 266         if ((r = manager_setup_cgroup(m)) < 0)
 267                 goto fail;
 268
 269         if ((r = manager_setup_notify(m)) < 0)
 270                 goto fail;
 271
 272         /* Try to connect to the busses, if possible. */
 273         if ((r = bus_init(m, running_as != MANAGER_SYSTEM)) < 0)
 274                 goto fail;
 275
 276 #ifdef HAVE_AUDIT
 277         if ((m->audit_fd = audit_open()) < 0)
 278                 log_error("Failed to connect to audit log: %m");
 279 #endif
 280
 281         m->taint_usr = dir_is_empty("/usr") > 0;
 282
 283         *_m = m;
 284         return 0;
 285
 286 fail:
 287         manager_free(m);
 288         return r;
 289 }
 290
 291 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
 292         Meta *meta;
 293         unsigned n = 0;
 294
 295         assert(m);
 296
 297         while ((meta = m->cleanup_queue)) {
 298                 assert(meta->in_cleanup_queue);
 299
 300                 unit_free((Unit*) meta);
 301                 n++;
 302         }
 303
 304         return n;
 305 }
 306
 307 enum {
 308         GC_OFFSET_IN_PATH,  /* This one is on the path we were traveling */
 309         GC_OFFSET_UNSURE,   /* No clue */
 310         GC_OFFSET_GOOD,     /* We still need this unit */
 311         GC_OFFSET_BAD,      /* We don't need this unit anymore */
 312         _GC_OFFSET_MAX
 313 };
 314
 315 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
 316         Iterator i;
 317         Unit *other;
 318         bool is_bad;
 319
 320         assert(u);
 321
 322         if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
 323             u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
 324             u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
 325                 return;
 326
 327         if (u->meta.in_cleanup_queue)
 328                 goto bad;
 329
 330         if (unit_check_gc(u))
 331                 goto good;
 332
 333         u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
 334
 335         is_bad = true;
 336
 337         SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
 338                 unit_gc_sweep(other, gc_marker);
 339
 340                 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
 341                         goto good;
 342
 343                 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
 344                         is_bad = false;
 345         }
 346
 347         if (is_bad)
 348                 goto bad;
 349
 350         /* We were unable to find anything out about this entry, so
 351          * let's investigate it later */
 352         u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
 353         unit_add_to_gc_queue(u);
 354         return;
 355
 356 bad:
 357         /* We definitely know that this one is not useful anymore, so
 358          * let's mark it for deletion */
 359         u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
 360         unit_add_to_cleanup_queue(u);
 361         return;
 362
 363 good:
 364         u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
 365 }
 366
 367 static unsigned manager_dispatch_gc_queue(Manager *m) {
 368         Meta *meta;
 369         unsigned n = 0;
 370         unsigned gc_marker;
 371
 372         assert(m);
 373
 374         if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
 375             (m->gc_queue_timestamp <= 0 ||
 376              (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
 377                 return 0;
 378
 379         log_debug("Running GC...");
 380
 381         m->gc_marker += _GC_OFFSET_MAX;
 382         if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
 383                 m->gc_marker = 1;
 384
 385         gc_marker = m->gc_marker;
 386
 387         while ((meta = m->gc_queue)) {
 388                 assert(meta->in_gc_queue);
 389
 390                 unit_gc_sweep((Unit*) meta, gc_marker);
 391
 392                 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
 393                 meta->in_gc_queue = false;
 394
 395                 n++;
 396
 397                 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
 398                     meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
 399                         log_debug("Collecting %s", meta->id);
 400                         meta->gc_marker = gc_marker + GC_OFFSET_BAD;
 401                         unit_add_to_cleanup_queue((Unit*) meta);
 402                 }
 403         }
 404
 405         m->n_in_gc_queue = 0;
 406         m->gc_queue_timestamp = 0;
 407
 408         return n;
 409 }
 410
 411 static void manager_clear_jobs_and_units(Manager *m) {
 412         Job *j;
 413         Unit *u;
 414
 415         assert(m);
 416
 417         while ((j = hashmap_first(m->transaction_jobs)))
 418                 job_free(j);
 419
 420         while ((u = hashmap_first(m->units)))
 421                 unit_free(u);
 422
 423         manager_dispatch_cleanup_queue(m);
 424
 425         assert(!m->load_queue);
 426         assert(!m->run_queue);
 427         assert(!m->dbus_unit_queue);
 428         assert(!m->dbus_job_queue);
 429         assert(!m->cleanup_queue);
 430         assert(!m->gc_queue);
 431
 432         assert(hashmap_isempty(m->transaction_jobs));
 433         assert(hashmap_isempty(m->jobs));
 434         assert(hashmap_isempty(m->units));
 435 }
 436
 437 void manager_free(Manager *m) {
 438         UnitType c;
 439
 440         assert(m);
 441
 442         manager_clear_jobs_and_units(m);
 443
 444         for (c = 0; c < _UNIT_TYPE_MAX; c++)
 445                 if (unit_vtable[c]->shutdown)
 446                         unit_vtable[c]->shutdown(m);
 447
 448         /* If we reexecute ourselves, we keep the root cgroup
 449          * around */
 450         manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
 451
 452         manager_undo_generators(m);
 453
 454         bus_done(m);
 455
 456         hashmap_free(m->units);
 457         hashmap_free(m->jobs);
 458         hashmap_free(m->transaction_jobs);
 459         hashmap_free(m->watch_pids);
 460         hashmap_free(m->watch_bus);
 461
 462         if (m->epoll_fd >= 0)
 463                 close_nointr_nofail(m->epoll_fd);
 464         if (m->signal_watch.fd >= 0)
 465                 close_nointr_nofail(m->signal_watch.fd);
 466         if (m->notify_watch.fd >= 0)
 467                 close_nointr_nofail(m->notify_watch.fd);
 468
 469 #ifdef HAVE_AUDIT
 470         if (m->audit_fd >= 0)
 471                 audit_close(m->audit_fd);
 472 #endif
 473
 474         free(m->notify_socket);
 475
 476         lookup_paths_free(&m->lookup_paths);
 477         strv_free(m->environment);
 478
 479         strv_free(m->default_controllers);
 480
 481         hashmap_free(m->cgroup_bondings);
 482         set_free_free(m->unit_path_cache);
 483
 484         free(m);
 485 }
 486
 487 int manager_enumerate(Manager *m) {
 488         int r = 0, q;
 489         UnitType c;
 490
 491         assert(m);
 492
 493         /* Let's ask every type to load all units from disk/kernel
 494          * that it might know */
 495         for (c = 0; c < _UNIT_TYPE_MAX; c++)
 496                 if (unit_vtable[c]->enumerate)
 497                         if ((q = unit_vtable[c]->enumerate(m)) < 0)
 498                                 r = q;
 499
 500         manager_dispatch_load_queue(m);
 501         return r;
 502 }
 503
 504 int manager_coldplug(Manager *m) {
 505         int r = 0, q;
 506         Iterator i;
 507         Unit *u;
 508         char *k;
 509
 510         assert(m);
 511
 512         /* Then, let's set up their initial state. */
 513         HASHMAP_FOREACH_KEY(u, k, m->units, i) {
 514
 515                 /* ignore aliases */
 516                 if (u->meta.id != k)
 517                         continue;
 518
 519                 if ((q = unit_coldplug(u)) < 0)
 520                         r = q;
 521         }
 522
 523         return r;
 524 }
 525
 526 static void manager_build_unit_path_cache(Manager *m) {
 527         char **i;
 528         DIR *d = NULL;
 529         int r;
 530
 531         assert(m);
 532
 533         set_free_free(m->unit_path_cache);
 534
 535         if (!(m->unit_path_cache = set_new(string_hash_func, string_compare_func))) {
 536                 log_error("Failed to allocate unit path cache.");
 537                 return;
 538         }
 539
 540         /* This simply builds a list of files we know exist, so that
 541          * we don't always have to go to disk */
 542
 543         STRV_FOREACH(i, m->lookup_paths.unit_path) {
 544                 struct dirent *de;
 545
 546                 if (!(d = opendir(*i))) {
 547                         log_error("Failed to open directory: %m");
 548                         continue;
 549                 }
 550
 551                 while ((de = readdir(d))) {
 552                         char *p;
 553
 554                         if (ignore_file(de->d_name))
 555                                 continue;
 556
 557                         if (asprintf(&p, "%s/%s", streq(*i, "/") ? "" : *i, de->d_name) < 0) {
 558                                 r = -ENOMEM;
 559                                 goto fail;
 560                         }
 561
 562                         if ((r = set_put(m->unit_path_cache, p)) < 0) {
 563                                 free(p);
 564                                 goto fail;
 565                         }
 566                 }
 567
 568                 closedir(d);
 569                 d = NULL;
 570         }
 571
 572         return;
 573
 574 fail:
 575         log_error("Failed to build unit path cache: %s", strerror(-r));
 576
 577         set_free_free(m->unit_path_cache);
 578         m->unit_path_cache = NULL;
 579
 580         if (d)
 581                 closedir(d);
 582 }
 583
 584 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
 585         int r, q;
 586
 587         assert(m);
 588
 589         manager_run_generators(m);
 590
 591         manager_build_unit_path_cache(m);
 592
 593         /* If we will deserialize make sure that during enumeration
 594          * this is already known, so we increase the counter here
 595          * already */
 596         if (serialization)
 597                 m->n_deserializing ++;
 598
 599         /* First, enumerate what we can from all config files */
 600         r = manager_enumerate(m);
 601
 602         /* Second, deserialize if there is something to deserialize */
 603         if (serialization)
 604                 if ((q = manager_deserialize(m, serialization, fds)) < 0)
 605                         r = q;
 606
 607         /* Third, fire things up! */
 608         if ((q = manager_coldplug(m)) < 0)
 609                 r = q;
 610
 611         if (serialization) {
 612                 assert(m->n_deserializing > 0);
 613                 m->n_deserializing --;
 614         }
 615
 616         return r;
 617 }
 618
 619 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
 620         assert(m);
 621         assert(j);
 622
 623         /* Deletes one job from the transaction */
 624
 625         manager_transaction_unlink_job(m, j, delete_dependencies);
 626
 627         if (!j->installed)
 628                 job_free(j);
 629 }
 630
 631 static void transaction_delete_unit(Manager *m, Unit *u) {
 632         Job *j;
 633
 634         /* Deletes all jobs associated with a certain unit from the
 635          * transaction */
 636
 637         while ((j = hashmap_get(m->transaction_jobs, u)))
 638                 transaction_delete_job(m, j, true);
 639 }
 640
 641 static void transaction_clean_dependencies(Manager *m) {
 642         Iterator i;
 643         Job *j;
 644
 645         assert(m);
 646
 647         /* Drops all dependencies of all installed jobs */
 648
 649         HASHMAP_FOREACH(j, m->jobs, i) {
 650                 while (j->subject_list)
 651                         job_dependency_free(j->subject_list);
 652                 while (j->object_list)
 653                         job_dependency_free(j->object_list);
 654         }
 655
 656         assert(!m->transaction_anchor);
 657 }
 658
 659 static void transaction_abort(Manager *m) {
 660         Job *j;
 661
 662         assert(m);
 663
 664         while ((j = hashmap_first(m->transaction_jobs)))
 665                 if (j->installed)
 666                         transaction_delete_job(m, j, true);
 667                 else
 668                         job_free(j);
 669
 670         assert(hashmap_isempty(m->transaction_jobs));
 671
 672         transaction_clean_dependencies(m);
 673 }
 674
 675 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
 676         JobDependency *l;
 677
 678         assert(m);
 679
 680         /* A recursive sweep through the graph that marks all units
 681          * that matter to the anchor job, i.e. are directly or
 682          * indirectly a dependency of the anchor job via paths that
 683          * are fully marked as mattering. */
 684
 685         if (j)
 686                 l = j->subject_list;
 687         else
 688                 l = m->transaction_anchor;
 689
 690         LIST_FOREACH(subject, l, l) {
 691
 692                 /* This link does not matter */
 693                 if (!l->matters)
 694                         continue;
 695
 696                 /* This unit has already been marked */
 697                 if (l->object->generation == generation)
 698                         continue;
 699
 700                 l->object->matters_to_anchor = true;
 701                 l->object->generation = generation;
 702
 703                 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
 704         }
 705 }
 706
 707 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
 708         JobDependency *l, *last;
 709
 710         assert(j);
 711         assert(other);
 712         assert(j->unit == other->unit);
 713         assert(!j->installed);
 714
 715         /* Merges 'other' into 'j' and then deletes j. */
 716
 717         j->type = t;
 718         j->state = JOB_WAITING;
 719         j->override = j->override || other->override;
 720
 721         j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
 722
 723         /* Patch us in as new owner of the JobDependency objects */
 724         last = NULL;
 725         LIST_FOREACH(subject, l, other->subject_list) {
 726                 assert(l->subject == other);
 727                 l->subject = j;
 728                 last = l;
 729         }
 730
 731         /* Merge both lists */
 732         if (last) {
 733                 last->subject_next = j->subject_list;
 734                 if (j->subject_list)
 735                         j->subject_list->subject_prev = last;
 736                 j->subject_list = other->subject_list;
 737         }
 738
 739         /* Patch us in as new owner of the JobDependency objects */
 740         last = NULL;
 741         LIST_FOREACH(object, l, other->object_list) {
 742                 assert(l->object == other);
 743                 l->object = j;
 744                 last = l;
 745         }
 746
 747         /* Merge both lists */
 748         if (last) {
 749                 last->object_next = j->object_list;
 750                 if (j->object_list)
 751                         j->object_list->object_prev = last;
 752                 j->object_list = other->object_list;
 753         }
 754
 755         /* Kill the other job */
 756         other->subject_list = NULL;
 757         other->object_list = NULL;
 758         transaction_delete_job(m, other, true);
 759 }
 760 static bool job_is_conflicted_by(Job *j) {
 761         JobDependency *l;
 762
 763         assert(j);
 764
 765         /* Returns true if this job is pulled in by a least one
 766          * ConflictedBy dependency. */
 767
 768         LIST_FOREACH(object, l, j->object_list)
 769                 if (l->conflicts)
 770                         return true;
 771
 772         return false;
 773 }
 774
 775 static int delete_one_unmergeable_job(Manager *m, Job *j) {
 776         Job *k;
 777
 778         assert(j);
 779
 780         /* Tries to delete one item in the linked list
 781          * j->transaction_next->transaction_next->... that conflicts
 782          * with another one, in an attempt to make an inconsistent
 783          * transaction work. */
 784
 785         /* We rely here on the fact that if a merged with b does not
 786          * merge with c, either a or b merge with c neither */
 787         LIST_FOREACH(transaction, j, j)
 788                 LIST_FOREACH(transaction, k, j->transaction_next) {
 789                         Job *d;
 790
 791                         /* Is this one mergeable? Then skip it */
 792                         if (job_type_is_mergeable(j->type, k->type))
 793                                 continue;
 794
 795                         /* Ok, we found two that conflict, let's see if we can
 796                          * drop one of them */
 797                         if (!j->matters_to_anchor && !k->matters_to_anchor) {
 798
 799                                 /* Both jobs don't matter, so let's
 800                                  * find the one that is smarter to
 801                                  * remove. Let's think positive and
 802                                  * rather remove stops then starts --
 803                                  * except if something is being
 804                                  * stopped because it is conflicted by
 805                                  * another unit in which case we
 806                                  * rather remove the start. */
 807
 808                                 log_debug("Looking at job %s/%s conflicted_by=%s", j->unit->meta.id, job_type_to_string(j->type), yes_no(j->type == JOB_STOP && job_is_conflicted_by(j)));
 809                                 log_debug("Looking at job %s/%s conflicted_by=%s", k->unit->meta.id, job_type_to_string(k->type), yes_no(k->type == JOB_STOP && job_is_conflicted_by(k)));
 810
 811                                 if (j->type == JOB_STOP) {
 812
 813                                         if (job_is_conflicted_by(j))
 814                                                 d = k;
 815                                         else
 816                                                 d = j;
 817
 818                                 } else if (k->type == JOB_STOP) {
 819
 820                                         if (job_is_conflicted_by(k))
 821                                                 d = j;
 822                                         else
 823                                                 d = k;
 824                                 } else
 825                                         d = j;
 826
 827                         } else if (!j->matters_to_anchor)
 828                                 d = j;
 829                         else if (!k->matters_to_anchor)
 830                                 d = k;
 831                         else
 832                                 return -ENOEXEC;
 833
 834                         /* Ok, we can drop one, so let's do so. */
 835                         log_debug("Fixing conflicting jobs by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
 836                         transaction_delete_job(m, d, true);
 837                         return 0;
 838                 }
 839
 840         return -EINVAL;
 841 }
 842
 843 static int transaction_merge_jobs(Manager *m, DBusError *e) {
 844         Job *j;
 845         Iterator i;
 846         int r;
 847
 848         assert(m);
 849
 850         /* First step, check whether any of the jobs for one specific
 851          * task conflict. If so, try to drop one of them. */
 852         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 853                 JobType t;
 854                 Job *k;
 855
 856                 t = j->type;
 857                 LIST_FOREACH(transaction, k, j->transaction_next) {
 858                         if (job_type_merge(&t, k->type) >= 0)
 859                                 continue;
 860
 861                         /* OK, we could not merge all jobs for this
 862                          * action. Let's see if we can get rid of one
 863                          * of them */
 864
 865                         if ((r = delete_one_unmergeable_job(m, j)) >= 0)
 866                                 /* Ok, we managed to drop one, now
 867                                  * let's ask our callers to call us
 868                                  * again after garbage collecting */
 869                                 return -EAGAIN;
 870
 871                         /* We couldn't merge anything. Failure */
 872                         dbus_set_error(e, BUS_ERROR_TRANSACTION_JOBS_CONFLICTING, "Transaction contains conflicting jobs '%s' and '%s' for %s. Probably contradicting requirement dependencies configured.",
 873                                        job_type_to_string(t), job_type_to_string(k->type), k->unit->meta.id);
 874                         return r;
 875                 }
 876         }
 877
 878         /* Second step, merge the jobs. */
 879         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 880                 JobType t = j->type;
 881                 Job *k;
 882
 883                 /* Merge all transactions */
 884                 LIST_FOREACH(transaction, k, j->transaction_next)
 885                         assert_se(job_type_merge(&t, k->type) == 0);
 886
 887                 /* If an active job is mergeable, merge it too */
 888                 if (j->unit->meta.job)
 889                         job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
 890
 891                 while ((k = j->transaction_next)) {
 892                         if (j->installed) {
 893                                 transaction_merge_and_delete_job(m, k, j, t);
 894                                 j = k;
 895                         } else
 896                                 transaction_merge_and_delete_job(m, j, k, t);
 897                 }
 898
 899                 assert(!j->transaction_next);
 900                 assert(!j->transaction_prev);
 901         }
 902
 903         return 0;
 904 }
 905
 906 static void transaction_drop_redundant(Manager *m) {
 907         bool again;
 908
 909         assert(m);
 910
 911         /* Goes through the transaction and removes all jobs that are
 912          * a noop */
 913
 914         do {
 915                 Job *j;
 916                 Iterator i;
 917
 918                 again = false;
 919
 920                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 921                         bool changes_something = false;
 922                         Job *k;
 923
 924                         LIST_FOREACH(transaction, k, j) {
 925
 926                                 if (!job_is_anchor(k) &&
 927                                     (k->installed || job_type_is_redundant(k->type, unit_active_state(k->unit))) &&
 928                                     (!k->unit->meta.job || !job_type_is_conflicting(k->type, k->unit->meta.job->type)))
 929                                         continue;
 930
 931                                 changes_something = true;
 932                                 break;
 933                         }
 934
 935                         if (changes_something)
 936                                 continue;
 937
 938                         /* log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type)); */
 939                         transaction_delete_job(m, j, false);
 940                         again = true;
 941                         break;
 942                 }
 943
 944         } while (again);
 945 }
 946
 947 static bool unit_matters_to_anchor(Unit *u, Job *j) {
 948         assert(u);
 949         assert(!j->transaction_prev);
 950
 951         /* Checks whether at least one of the jobs for this unit
 952          * matters to the anchor. */
 953
 954         LIST_FOREACH(transaction, j, j)
 955                 if (j->matters_to_anchor)
 956                         return true;
 957
 958         return false;
 959 }
 960
 961 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation, DBusError *e) {
 962         Iterator i;
 963         Unit *u;
 964         int r;
 965
 966         assert(m);
 967         assert(j);
 968         assert(!j->transaction_prev);
 969
 970         /* Does a recursive sweep through the ordering graph, looking
 971          * for a cycle. If we find cycle we try to break it. */
 972
 973         /* Have we seen this before? */
 974         if (j->generation == generation) {
 975                 Job *k, *delete;
 976
 977                 /* If the marker is NULL we have been here already and
 978                  * decided the job was loop-free from here. Hence
 979                  * shortcut things and return right-away. */
 980                 if (!j->marker)
 981                         return 0;
 982
 983                 /* So, the marker is not NULL and we already have been
 984                  * here. We have a cycle. Let's try to break it. We go
 985                  * backwards in our path and try to find a suitable
 986                  * job to remove. We use the marker to find our way
 987                  * back, since smart how we are we stored our way back
 988                  * in there. */
 989                 log_warning("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
 990
 991                 delete = NULL;
 992                 for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
 993
 994                         log_info("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
 995
 996                         if (!delete &&
 997                             !k->installed &&
 998                             !unit_matters_to_anchor(k->unit, k)) {
 999                                 /* Ok, we can drop this one, so let's
1000                                  * do so. */
1001                                 delete = k;
1002                         }
1003
1004                         /* Check if this in fact was the beginning of
1005                          * the cycle */
1006                         if (k == j)
1007                                 break;
1008                 }
1009
1010
1011                 if (delete) {
1012                         log_warning("Breaking ordering cycle by deleting job %s/%s", delete->unit->meta.id, job_type_to_string(delete->type));
1013                         transaction_delete_unit(m, delete->unit);
1014                         return -EAGAIN;
1015                 }
1016
1017                 log_error("Unable to break cycle");
1018
1019                 dbus_set_error(e, BUS_ERROR_TRANSACTION_ORDER_IS_CYCLIC, "Transaction order is cyclic. See system logs for details.");
1020                 return -ENOEXEC;
1021         }
1022
1023         /* Make the marker point to where we come from, so that we can
1024          * find our way backwards if we want to break a cycle. We use
1025          * a special marker for the beginning: we point to
1026          * ourselves. */
1027         j->marker = from ? from : j;
1028         j->generation = generation;
1029
1030         /* We assume that the the dependencies are bidirectional, and
1031          * hence can ignore UNIT_AFTER */
1032         SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
1033                 Job *o;
1034
1035                 /* Is there a job for this unit? */
1036                 if (!(o = hashmap_get(m->transaction_jobs, u)))
1037
1038                         /* Ok, there is no job for this in the
1039                          * transaction, but maybe there is already one
1040                          * running? */
1041                         if (!(o = u->meta.job))
1042                                 continue;
1043
1044                 if ((r = transaction_verify_order_one(m, o, j, generation, e)) < 0)
1045                         return r;
1046         }
1047
1048         /* Ok, let's backtrack, and remember that this entry is not on
1049          * our path anymore. */
1050         j->marker = NULL;
1051
1052         return 0;
1053 }
1054
1055 static int transaction_verify_order(Manager *m, unsigned *generation, DBusError *e) {
1056         Job *j;
1057         int r;
1058         Iterator i;
1059         unsigned g;
1060
1061         assert(m);
1062         assert(generation);
1063
1064         /* Check if the ordering graph is cyclic. If it is, try to fix
1065          * that up by dropping one of the jobs. */
1066
1067         g = (*generation)++;
1068
1069         HASHMAP_FOREACH(j, m->transaction_jobs, i)
1070                 if ((r = transaction_verify_order_one(m, j, NULL, g, e)) < 0)
1071                         return r;
1072
1073         return 0;
1074 }
1075
1076 static void transaction_collect_garbage(Manager *m) {
1077         bool again;
1078
1079         assert(m);
1080
1081         /* Drop jobs that are not required by any other job */
1082
1083         do {
1084                 Iterator i;
1085                 Job *j;
1086
1087                 again = false;
1088
1089                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1090                         if (j->object_list) {
1091                                 /* log_debug("Keeping job %s/%s because of %s/%s", */
1092                                 /*           j->unit->meta.id, job_type_to_string(j->type), */
1093                                 /*           j->object_list->subject ? j->object_list->subject->unit->meta.id : "root", */
1094                                 /*           j->object_list->subject ? job_type_to_string(j->object_list->subject->type) : "root"); */
1095                                 continue;
1096                         }
1097
1098                         /* log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type)); */
1099                         transaction_delete_job(m, j, true);
1100                         again = true;
1101                         break;
1102                 }
1103
1104         } while (again);
1105 }
1106
1107 static int transaction_is_destructive(Manager *m, DBusError *e) {
1108         Iterator i;
1109         Job *j;
1110
1111         assert(m);
1112
1113         /* Checks whether applying this transaction means that
1114          * existing jobs would be replaced */
1115
1116         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1117
1118                 /* Assume merged */
1119                 assert(!j->transaction_prev);
1120                 assert(!j->transaction_next);
1121
1122                 if (j->unit->meta.job &&
1123                     j->unit->meta.job != j &&
1124                     !job_type_is_superset(j->type, j->unit->meta.job->type)) {
1125
1126                         dbus_set_error(e, BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE, "Transaction is destructive.");
1127                         return -EEXIST;
1128                 }
1129         }
1130
1131         return 0;
1132 }
1133
1134 static void transaction_minimize_impact(Manager *m) {
1135         bool again;
1136         assert(m);
1137
1138         /* Drops all unnecessary jobs that reverse already active jobs
1139          * or that stop a running service. */
1140
1141         do {
1142                 Job *j;
1143                 Iterator i;
1144
1145                 again = false;
1146
1147                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1148                         LIST_FOREACH(transaction, j, j) {
1149                                 bool stops_running_service, changes_existing_job;
1150
1151                                 /* If it matters, we shouldn't drop it */
1152                                 if (j->matters_to_anchor)
1153                                         continue;
1154
1155                                 /* Would this stop a running service?
1156                                  * Would this change an existing job?
1157                                  * If so, let's drop this entry */
1158
1159                                 stops_running_service =
1160                                         j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1161
1162                                 changes_existing_job =
1163                                         j->unit->meta.job &&
1164                                         job_type_is_conflicting(j->type, j->unit->meta.job->type);
1165
1166                                 if (!stops_running_service && !changes_existing_job)
1167                                         continue;
1168
1169                                 if (stops_running_service)
1170                                         log_info("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1171
1172                                 if (changes_existing_job)
1173                                         log_info("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1174
1175                                 /* Ok, let's get rid of this */
1176                                 log_info("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1177
1178                                 transaction_delete_job(m, j, true);
1179                                 again = true;
1180                                 break;
1181                         }
1182
1183                         if (again)
1184                                 break;
1185                 }
1186
1187         } while (again);
1188 }
1189
1190 static int transaction_apply(Manager *m) {
1191         Iterator i;
1192         Job *j;
1193         int r;
1194
1195         /* Moves the transaction jobs to the set of active jobs */
1196
1197         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1198                 /* Assume merged */
1199                 assert(!j->transaction_prev);
1200                 assert(!j->transaction_next);
1201
1202                 if (j->installed)
1203                         continue;
1204
1205                 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1206                         goto rollback;
1207         }
1208
1209         while ((j = hashmap_steal_first(m->transaction_jobs))) {
1210                 if (j->installed) {
1211                         /* log_debug("Skipping already installed job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id); */
1212                         continue;
1213                 }
1214
1215                 if (j->unit->meta.job)
1216                         job_free(j->unit->meta.job);
1217
1218                 j->unit->meta.job = j;
1219                 j->installed = true;
1220                 m->n_installed_jobs ++;
1221
1222                 /* We're fully installed. Now let's free data we don't
1223                  * need anymore. */
1224
1225                 assert(!j->transaction_next);
1226                 assert(!j->transaction_prev);
1227
1228                 job_add_to_run_queue(j);
1229                 job_add_to_dbus_queue(j);
1230                 job_start_timer(j);
1231
1232                 log_debug("Installed new job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id);
1233         }
1234
1235         /* As last step, kill all remaining job dependencies. */
1236         transaction_clean_dependencies(m);
1237
1238         return 0;
1239
1240 rollback:
1241
1242         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1243                 if (j->installed)
1244                         continue;
1245
1246                 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1247         }
1248
1249         return r;
1250 }
1251
1252 static int transaction_activate(Manager *m, JobMode mode, DBusError *e) {
1253         int r;
1254         unsigned generation = 1;
1255
1256         assert(m);
1257
1258         /* This applies the changes recorded in transaction_jobs to
1259          * the actual list of jobs, if possible. */
1260
1261         /* First step: figure out which jobs matter */
1262         transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1263
1264         /* Second step: Try not to stop any running services if
1265          * we don't have to. Don't try to reverse running
1266          * jobs if we don't have to. */
1267         if (mode == JOB_FAIL)
1268                 transaction_minimize_impact(m);
1269
1270         /* Third step: Drop redundant jobs */
1271         transaction_drop_redundant(m);
1272
1273         for (;;) {
1274                 /* Fourth step: Let's remove unneeded jobs that might
1275                  * be lurking. */
1276                 if (mode != JOB_ISOLATE)
1277                         transaction_collect_garbage(m);
1278
1279                 /* Fifth step: verify order makes sense and correct
1280                  * cycles if necessary and possible */
1281                 if ((r = transaction_verify_order(m, &generation, e)) >= 0)
1282                         break;
1283
1284                 if (r != -EAGAIN) {
1285                         log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r));
1286                         goto rollback;
1287                 }
1288
1289                 /* Let's see if the resulting transaction ordering
1290                  * graph is still cyclic... */
1291         }
1292
1293         for (;;) {
1294                 /* Sixth step: let's drop unmergeable entries if
1295                  * necessary and possible, merge entries we can
1296                  * merge */
1297                 if ((r = transaction_merge_jobs(m, e)) >= 0)
1298                         break;
1299
1300                 if (r != -EAGAIN) {
1301                         log_warning("Requested transaction contains unmergeable jobs: %s", bus_error(e, r));
1302                         goto rollback;
1303                 }
1304
1305                 /* Seventh step: an entry got dropped, let's garbage
1306                  * collect its dependencies. */
1307                 if (mode != JOB_ISOLATE)
1308                         transaction_collect_garbage(m);
1309
1310                 /* Let's see if the resulting transaction still has
1311                  * unmergeable entries ... */
1312         }
1313
1314         /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1315         transaction_drop_redundant(m);
1316
1317         /* Ninth step: check whether we can actually apply this */
1318         if (mode == JOB_FAIL)
1319                 if ((r = transaction_is_destructive(m, e)) < 0) {
1320                         log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r));
1321                         goto rollback;
1322                 }
1323
1324         /* Tenth step: apply changes */
1325         if ((r = transaction_apply(m)) < 0) {
1326                 log_warning("Failed to apply transaction: %s", strerror(-r));
1327                 goto rollback;
1328         }
1329
1330         assert(hashmap_isempty(m->transaction_jobs));
1331         assert(!m->transaction_anchor);
1332
1333         return 0;
1334
1335 rollback:
1336         transaction_abort(m);
1337         return r;
1338 }
1339
1340 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1341         Job *j, *f;
1342
1343         assert(m);
1344         assert(unit);
1345
1346         /* Looks for an existing prospective job and returns that. If
1347          * it doesn't exist it is created and added to the prospective
1348          * jobs list. */
1349
1350         f = hashmap_get(m->transaction_jobs, unit);
1351
1352         LIST_FOREACH(transaction, j, f) {
1353                 assert(j->unit == unit);
1354
1355                 if (j->type == type) {
1356                         if (is_new)
1357                                 *is_new = false;
1358                         return j;
1359                 }
1360         }
1361
1362         if (unit->meta.job && unit->meta.job->type == type)
1363                 j = unit->meta.job;
1364         else if (!(j = job_new(m, type, unit)))
1365                 return NULL;
1366
1367         j->generation = 0;
1368         j->marker = NULL;
1369         j->matters_to_anchor = false;
1370         j->override = override;
1371
1372         LIST_PREPEND(Job, transaction, f, j);
1373
1374         if (hashmap_replace(m->transaction_jobs, unit, f) < 0) {
1375                 job_free(j);
1376                 return NULL;
1377         }
1378
1379         if (is_new)
1380                 *is_new = true;
1381
1382         /* log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type)); */
1383
1384         return j;
1385 }
1386
1387 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1388         assert(m);
1389         assert(j);
1390
1391         if (j->transaction_prev)
1392                 j->transaction_prev->transaction_next = j->transaction_next;
1393         else if (j->transaction_next)
1394                 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1395         else
1396                 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1397
1398         if (j->transaction_next)
1399                 j->transaction_next->transaction_prev = j->transaction_prev;
1400
1401         j->transaction_prev = j->transaction_next = NULL;
1402
1403         while (j->subject_list)
1404                 job_dependency_free(j->subject_list);
1405
1406         while (j->object_list) {
1407                 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1408
1409                 job_dependency_free(j->object_list);
1410
1411                 if (other && delete_dependencies) {
1412                         log_debug("Deleting job %s/%s as dependency of job %s/%s",
1413                                   other->unit->meta.id, job_type_to_string(other->type),
1414                                   j->unit->meta.id, job_type_to_string(j->type));
1415                         transaction_delete_job(m, other, delete_dependencies);
1416                 }
1417         }
1418 }
1419
1420 static int transaction_add_job_and_dependencies(
1421                 Manager *m,
1422                 JobType type,
1423                 Unit *unit,
1424                 Job *by,
1425                 bool matters,
1426                 bool override,
1427                 bool conflicts,
1428                 bool ignore_requirements,
1429                 bool ignore_order,
1430                 DBusError *e,
1431                 Job **_ret) {
1432         Job *ret;
1433         Iterator i;
1434         Unit *dep;
1435         int r;
1436         bool is_new;
1437
1438         assert(m);
1439         assert(type < _JOB_TYPE_MAX);
1440         assert(unit);
1441
1442         /* log_debug("Pulling in %s/%s from %s/%s", */
1443         /*           unit->meta.id, job_type_to_string(type), */
1444         /*           by ? by->unit->meta.id : "NA", */
1445         /*           by ? job_type_to_string(by->type) : "NA"); */
1446
1447         if (unit->meta.load_state != UNIT_LOADED &&
1448             unit->meta.load_state != UNIT_ERROR &&
1449             unit->meta.load_state != UNIT_MASKED) {
1450                 dbus_set_error(e, BUS_ERROR_LOAD_FAILED, "Unit %s is not loaded properly.", unit->meta.id);
1451                 return -EINVAL;
1452         }
1453
1454         if (type != JOB_STOP && unit->meta.load_state == UNIT_ERROR) {
1455                 dbus_set_error(e, BUS_ERROR_LOAD_FAILED,
1456                                "Unit %s failed to load: %s. "
1457                                "See system logs and 'systemctl status' for details.",
1458                                unit->meta.id,
1459                                strerror(-unit->meta.load_error));
1460                 return -EINVAL;
1461         }
1462
1463         if (type != JOB_STOP && unit->meta.load_state == UNIT_MASKED) {
1464                 dbus_set_error(e, BUS_ERROR_MASKED, "Unit %s is masked.", unit->meta.id);
1465                 return -EINVAL;
1466         }
1467
1468         if (!unit_job_is_applicable(unit, type)) {
1469                 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);
1470                 return -EBADR;
1471         }
1472
1473         /* First add the job. */
1474         if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1475                 return -ENOMEM;
1476
1477         ret->ignore_order = ret->ignore_order || ignore_order;
1478
1479         /* Then, add a link to the job. */
1480         if (!job_dependency_new(by, ret, matters, conflicts))
1481                 return -ENOMEM;
1482
1483         if (is_new && !ignore_requirements) {
1484                 Set *following;
1485
1486                 /* If we are following some other unit, make sure we
1487                  * add all dependencies of everybody following. */
1488                 if (unit_following_set(ret->unit, &following) > 0) {
1489                         SET_FOREACH(dep, following, i)
1490                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
1491                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1492
1493                                         if (e)
1494                                                 dbus_error_free(e);
1495                                 }
1496
1497                         set_free(following);
1498                 }
1499
1500                 /* Finally, recursively add in all dependencies. */
1501                 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1502                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1503                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1504                                         if (r != -EBADR)
1505                                                 goto fail;
1506
1507                                         if (e)
1508                                                 dbus_error_free(e);
1509                                 }
1510
1511                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BIND_TO], i)
1512                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1513
1514                                         if (r != -EBADR)
1515                                                 goto fail;
1516
1517                                         if (e)
1518                                                 dbus_error_free(e);
1519                                 }
1520
1521                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1522                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
1523                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1524
1525                                         if (e)
1526                                                 dbus_error_free(e);
1527                                 }
1528
1529                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1530                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, false, false, ignore_order, e, NULL)) < 0) {
1531                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1532
1533                                         if (e)
1534                                                 dbus_error_free(e);
1535                                 }
1536
1537                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1538                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1539
1540                                         if (r != -EBADR)
1541                                                 goto fail;
1542
1543                                         if (e)
1544                                                 dbus_error_free(e);
1545                                 }
1546
1547                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1548                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
1549                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1550
1551                                         if (e)
1552                                                 dbus_error_free(e);
1553                                 }
1554
1555                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1556                                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, true, false, ignore_order, e, NULL)) < 0) {
1557
1558                                         if (r != -EBADR)
1559                                                 goto fail;
1560
1561                                         if (e)
1562                                                 dbus_error_free(e);
1563                                 }
1564
1565                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTED_BY], i)
1566                                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
1567                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1568
1569                                         if (e)
1570                                                 dbus_error_free(e);
1571                                 }
1572
1573                 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1574
1575                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1576                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1577
1578                                         if (r != -EBADR)
1579                                                 goto fail;
1580
1581                                         if (e)
1582                                                 dbus_error_free(e);
1583                                 }
1584
1585                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BOUND_BY], i)
1586                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1587
1588                                         if (r != -EBADR)
1589                                                 goto fail;
1590
1591                                         if (e)
1592                                                 dbus_error_free(e);
1593                                 }
1594                 }
1595
1596                 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1597         }
1598
1599         if (_ret)
1600                 *_ret = ret;
1601
1602         return 0;
1603
1604 fail:
1605         return r;
1606 }
1607
1608 static int transaction_add_isolate_jobs(Manager *m) {
1609         Iterator i;
1610         Unit *u;
1611         char *k;
1612         int r;
1613
1614         assert(m);
1615
1616         HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1617
1618                 /* ignore aliases */
1619                 if (u->meta.id != k)
1620                         continue;
1621
1622                 if (UNIT_VTABLE(u)->no_isolate)
1623                         continue;
1624
1625                 /* No need to stop inactive jobs */
1626                 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)) && !u->meta.job)
1627                         continue;
1628
1629                 /* Is there already something listed for this? */
1630                 if (hashmap_get(m->transaction_jobs, u))
1631                         continue;
1632
1633                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, false, false, false, NULL, NULL)) < 0)
1634                         log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1635         }
1636
1637         return 0;
1638 }
1639
1640 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, DBusError *e, Job **_ret) {
1641         int r;
1642         Job *ret;
1643
1644         assert(m);
1645         assert(type < _JOB_TYPE_MAX);
1646         assert(unit);
1647         assert(mode < _JOB_MODE_MAX);
1648
1649         if (mode == JOB_ISOLATE && type != JOB_START) {
1650                 dbus_set_error(e, BUS_ERROR_INVALID_JOB_MODE, "Isolate is only valid for start.");
1651                 return -EINVAL;
1652         }
1653
1654         if (mode == JOB_ISOLATE && !unit->meta.allow_isolate) {
1655                 dbus_set_error(e, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
1656                 return -EPERM;
1657         }
1658
1659         log_debug("Trying to enqueue job %s/%s/%s", unit->meta.id, job_type_to_string(type), job_mode_to_string(mode));
1660
1661         if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, false,
1662                                                       mode == JOB_IGNORE_DEPENDENCIES || mode == JOB_IGNORE_REQUIREMENTS,
1663                                                       mode == JOB_IGNORE_DEPENDENCIES, e, &ret)) < 0) {
1664                 transaction_abort(m);
1665                 return r;
1666         }
1667
1668         if (mode == JOB_ISOLATE)
1669                 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1670                         transaction_abort(m);
1671                         return r;
1672                 }
1673
1674         if ((r = transaction_activate(m, mode, e)) < 0)
1675                 return r;
1676
1677         log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1678
1679         if (_ret)
1680                 *_ret = ret;
1681
1682         return 0;
1683 }
1684
1685 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, DBusError *e, Job **_ret) {
1686         Unit *unit;
1687         int r;
1688
1689         assert(m);
1690         assert(type < _JOB_TYPE_MAX);
1691         assert(name);
1692         assert(mode < _JOB_MODE_MAX);
1693
1694         if ((r = manager_load_unit(m, name, NULL, NULL, &unit)) < 0)
1695                 return r;
1696
1697         return manager_add_job(m, type, unit, mode, override, e, _ret);
1698 }
1699
1700 Job *manager_get_job(Manager *m, uint32_t id) {
1701         assert(m);
1702
1703         return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1704 }
1705
1706 Unit *manager_get_unit(Manager *m, const char *name) {
1707         assert(m);
1708         assert(name);
1709
1710         return hashmap_get(m->units, name);
1711 }
1712
1713 unsigned manager_dispatch_load_queue(Manager *m) {
1714         Meta *meta;
1715         unsigned n = 0;
1716
1717         assert(m);
1718
1719         /* Make sure we are not run recursively */
1720         if (m->dispatching_load_queue)
1721                 return 0;
1722
1723         m->dispatching_load_queue = true;
1724
1725         /* Dispatches the load queue. Takes a unit from the queue and
1726          * tries to load its data until the queue is empty */
1727
1728         while ((meta = m->load_queue)) {
1729                 assert(meta->in_load_queue);
1730
1731                 unit_load((Unit*) meta);
1732                 n++;
1733         }
1734
1735         m->dispatching_load_queue = false;
1736         return n;
1737 }
1738
1739 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1740         Unit *ret;
1741         int r;
1742
1743         assert(m);
1744         assert(name || path);
1745
1746         /* This will prepare the unit for loading, but not actually
1747          * load anything from disk. */
1748
1749         if (path && !is_path(path)) {
1750                 dbus_set_error(e, BUS_ERROR_INVALID_PATH, "Path %s is not absolute.", path);
1751                 return -EINVAL;
1752         }
1753
1754         if (!name)
1755                 name = file_name_from_path(path);
1756
1757         if (!unit_name_is_valid(name, false)) {
1758                 dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
1759                 return -EINVAL;
1760         }
1761
1762         if ((ret = manager_get_unit(m, name))) {
1763                 *_ret = ret;
1764                 return 1;
1765         }
1766
1767         if (!(ret = unit_new(m)))
1768                 return -ENOMEM;
1769
1770         if (path)
1771                 if (!(ret->meta.fragment_path = strdup(path))) {
1772                         unit_free(ret);
1773                         return -ENOMEM;
1774                 }
1775
1776         if ((r = unit_add_name(ret, name)) < 0) {
1777                 unit_free(ret);
1778                 return r;
1779         }
1780
1781         unit_add_to_load_queue(ret);
1782         unit_add_to_dbus_queue(ret);
1783         unit_add_to_gc_queue(ret);
1784
1785         if (_ret)
1786                 *_ret = ret;
1787
1788         return 0;
1789 }
1790
1791 int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1792         int r;
1793
1794         assert(m);
1795
1796         /* This will load the service information files, but not actually
1797          * start any services or anything. */
1798
1799         if ((r = manager_load_unit_prepare(m, name, path, e, _ret)) != 0)
1800                 return r;
1801
1802         manager_dispatch_load_queue(m);
1803
1804         if (_ret)
1805                 *_ret = unit_follow_merge(*_ret);
1806
1807         return 0;
1808 }
1809
1810 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1811         Iterator i;
1812         Job *j;
1813
1814         assert(s);
1815         assert(f);
1816
1817         HASHMAP_FOREACH(j, s->jobs, i)
1818                 job_dump(j, f, prefix);
1819 }
1820
1821 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1822         Iterator i;
1823         Unit *u;
1824         const char *t;
1825
1826         assert(s);
1827         assert(f);
1828
1829         HASHMAP_FOREACH_KEY(u, t, s->units, i)
1830                 if (u->meta.id == t)
1831                         unit_dump(u, f, prefix);
1832 }
1833
1834 void manager_clear_jobs(Manager *m) {
1835         Job *j;
1836
1837         assert(m);
1838
1839         transaction_abort(m);
1840
1841         while ((j = hashmap_first(m->jobs)))
1842                 job_finish_and_invalidate(j, JOB_CANCELED);
1843 }
1844
1845 unsigned manager_dispatch_run_queue(Manager *m) {
1846         Job *j;
1847         unsigned n = 0;
1848
1849         if (m->dispatching_run_queue)
1850                 return 0;
1851
1852         m->dispatching_run_queue = true;
1853
1854         while ((j = m->run_queue)) {
1855                 assert(j->installed);
1856                 assert(j->in_run_queue);
1857
1858                 job_run_and_invalidate(j);
1859                 n++;
1860         }
1861
1862         m->dispatching_run_queue = false;
1863         return n;
1864 }
1865
1866 unsigned manager_dispatch_dbus_queue(Manager *m) {
1867         Job *j;
1868         Meta *meta;
1869         unsigned n = 0;
1870
1871         assert(m);
1872
1873         if (m->dispatching_dbus_queue)
1874                 return 0;
1875
1876         m->dispatching_dbus_queue = true;
1877
1878         while ((meta = m->dbus_unit_queue)) {
1879                 assert(meta->in_dbus_queue);
1880
1881                 bus_unit_send_change_signal((Unit*) meta);
1882                 n++;
1883         }
1884
1885         while ((j = m->dbus_job_queue)) {
1886                 assert(j->in_dbus_queue);
1887
1888                 bus_job_send_change_signal(j);
1889                 n++;
1890         }
1891
1892         m->dispatching_dbus_queue = false;
1893         return n;
1894 }
1895
1896 static int manager_process_notify_fd(Manager *m) {
1897         ssize_t n;
1898
1899         assert(m);
1900
1901         for (;;) {
1902                 char buf[4096];
1903                 struct msghdr msghdr;
1904                 struct iovec iovec;
1905                 struct ucred *ucred;
1906                 union {
1907                         struct cmsghdr cmsghdr;
1908                         uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1909                 } control;
1910                 Unit *u;
1911                 char **tags;
1912
1913                 zero(iovec);
1914                 iovec.iov_base = buf;
1915                 iovec.iov_len = sizeof(buf)-1;
1916
1917                 zero(control);
1918                 zero(msghdr);
1919                 msghdr.msg_iov = &iovec;
1920                 msghdr.msg_iovlen = 1;
1921                 msghdr.msg_control = &control;
1922                 msghdr.msg_controllen = sizeof(control);
1923
1924                 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1925                         if (n >= 0)
1926                                 return -EIO;
1927
1928                         if (errno == EAGAIN || errno == EINTR)
1929                                 break;
1930
1931                         return -errno;
1932                 }
1933
1934                 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1935                     control.cmsghdr.cmsg_level != SOL_SOCKET ||
1936                     control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1937                     control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1938                         log_warning("Received notify message without credentials. Ignoring.");
1939                         continue;
1940                 }
1941
1942                 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1943
1944                 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(ucred->pid))))
1945                         if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1946                                 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1947                                 continue;
1948                         }
1949
1950                 assert((size_t) n < sizeof(buf));
1951                 buf[n] = 0;
1952                 if (!(tags = strv_split(buf, "\n\r")))
1953                         return -ENOMEM;
1954
1955                 log_debug("Got notification message for unit %s", u->meta.id);
1956
1957                 if (UNIT_VTABLE(u)->notify_message)
1958                         UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
1959
1960                 strv_free(tags);
1961         }
1962
1963         return 0;
1964 }
1965
1966 static int manager_dispatch_sigchld(Manager *m) {
1967         assert(m);
1968
1969         for (;;) {
1970                 siginfo_t si;
1971                 Unit *u;
1972                 int r;
1973
1974                 zero(si);
1975
1976                 /* First we call waitd() for a PID and do not reap the
1977                  * zombie. That way we can still access /proc/$PID for
1978                  * it while it is a zombie. */
1979                 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1980
1981                         if (errno == ECHILD)
1982                                 break;
1983
1984                         if (errno == EINTR)
1985                                 continue;
1986
1987                         return -errno;
1988                 }
1989
1990                 if (si.si_pid <= 0)
1991                         break;
1992
1993                 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
1994                         char *name = NULL;
1995
1996                         get_process_name(si.si_pid, &name);
1997                         log_debug("Got SIGCHLD for process %lu (%s)", (unsigned long) si.si_pid, strna(name));
1998                         free(name);
1999                 }
2000
2001                 /* Let's flush any message the dying child might still
2002                  * have queued for us. This ensures that the process
2003                  * still exists in /proc so that we can figure out
2004                  * which cgroup and hence unit it belongs to. */
2005                 if ((r = manager_process_notify_fd(m)) < 0)
2006                         return r;
2007
2008                 /* And now figure out the unit this belongs to */
2009                 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(si.si_pid))))
2010                         u = cgroup_unit_by_pid(m, si.si_pid);
2011
2012                 /* And now, we actually reap the zombie. */
2013                 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
2014                         if (errno == EINTR)
2015                                 continue;
2016
2017                         return -errno;
2018                 }
2019
2020                 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
2021                         continue;
2022
2023                 log_debug("Child %lu died (code=%s, status=%i/%s)",
2024                           (long unsigned) si.si_pid,
2025                           sigchld_code_to_string(si.si_code),
2026                           si.si_status,
2027                           strna(si.si_code == CLD_EXITED
2028                                 ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
2029                                 : signal_to_string(si.si_status)));
2030
2031                 if (!u)
2032                         continue;
2033
2034                 log_debug("Child %lu belongs to %s", (long unsigned) si.si_pid, u->meta.id);
2035
2036                 hashmap_remove(m->watch_pids, LONG_TO_PTR(si.si_pid));
2037                 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
2038         }
2039
2040         return 0;
2041 }
2042
2043 static int manager_start_target(Manager *m, const char *name, JobMode mode) {
2044         int r;
2045         DBusError error;
2046
2047         dbus_error_init(&error);
2048
2049         log_debug("Activating special unit %s", name);
2050
2051         if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL)) < 0)
2052                 log_error("Failed to enqueue %s job: %s", name, bus_error(&error, r));
2053
2054         dbus_error_free(&error);
2055
2056         return r;
2057 }
2058
2059 static int manager_process_signal_fd(Manager *m) {
2060         ssize_t n;
2061         struct signalfd_siginfo sfsi;
2062         bool sigchld = false;
2063
2064         assert(m);
2065
2066         for (;;) {
2067                 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
2068
2069                         if (n >= 0)
2070                                 return -EIO;
2071
2072                         if (errno == EINTR || errno == EAGAIN)
2073                                 break;
2074
2075                         return -errno;
2076                 }
2077
2078                 if (sfsi.ssi_pid > 0) {
2079                         char *p = NULL;
2080
2081                         get_process_name(sfsi.ssi_pid, &p);
2082
2083                         log_debug("Received SIG%s from PID %lu (%s).",
2084                                   strna(signal_to_string(sfsi.ssi_signo)),
2085                                   (unsigned long) sfsi.ssi_pid, strna(p));
2086                         free(p);
2087                 } else
2088                         log_debug("Received SIG%s.", strna(signal_to_string(sfsi.ssi_signo)));
2089
2090                 switch (sfsi.ssi_signo) {
2091
2092                 case SIGCHLD:
2093                         sigchld = true;
2094                         break;
2095
2096                 case SIGTERM:
2097                         if (m->running_as == MANAGER_SYSTEM) {
2098                                 /* This is for compatibility with the
2099                                  * original sysvinit */
2100                                 m->exit_code = MANAGER_REEXECUTE;
2101                                 break;
2102                         }
2103
2104                         /* Fall through */
2105
2106                 case SIGINT:
2107                         if (m->running_as == MANAGER_SYSTEM) {
2108                                 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
2109                                 break;
2110                         }
2111
2112                         /* Run the exit target if there is one, if not, just exit. */
2113                         if (manager_start_target(m, SPECIAL_EXIT_TARGET, JOB_REPLACE) < 0) {
2114                                 m->exit_code = MANAGER_EXIT;
2115                                 return 0;
2116                         }
2117
2118                         break;
2119
2120                 case SIGWINCH:
2121                         if (m->running_as == MANAGER_SYSTEM)
2122                                 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
2123
2124                         /* This is a nop on non-init */
2125                         break;
2126
2127                 case SIGPWR:
2128                         if (m->running_as == MANAGER_SYSTEM)
2129                                 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
2130
2131                         /* This is a nop on non-init */
2132                         break;
2133
2134                 case SIGUSR1: {
2135                         Unit *u;
2136
2137                         u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
2138
2139                         if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
2140                                 log_info("Trying to reconnect to bus...");
2141                                 bus_init(m, true);
2142                         }
2143
2144                         if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
2145                                 log_info("Loading D-Bus service...");
2146                                 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
2147                         }
2148
2149                         break;
2150                 }
2151
2152                 case SIGUSR2: {
2153                         FILE *f;
2154                         char *dump = NULL;
2155                         size_t size;
2156
2157                         if (!(f = open_memstream(&dump, &size))) {
2158                                 log_warning("Failed to allocate memory stream.");
2159                                 break;
2160                         }
2161
2162                         manager_dump_units(m, f, "\t");
2163                         manager_dump_jobs(m, f, "\t");
2164
2165                         if (ferror(f)) {
2166                                 fclose(f);
2167                                 free(dump);
2168                                 log_warning("Failed to write status stream");
2169                                 break;
2170                         }
2171
2172                         fclose(f);
2173                         log_dump(LOG_INFO, dump);
2174                         free(dump);
2175
2176                         break;
2177                 }
2178
2179                 case SIGHUP:
2180                         m->exit_code = MANAGER_RELOAD;
2181                         break;
2182
2183                 default: {
2184                         /* Starting SIGRTMIN+0 */
2185                         static const char * const target_table[] = {
2186                                 [0] = SPECIAL_DEFAULT_TARGET,
2187                                 [1] = SPECIAL_RESCUE_TARGET,
2188                                 [2] = SPECIAL_EMERGENCY_TARGET,
2189                                 [3] = SPECIAL_HALT_TARGET,
2190                                 [4] = SPECIAL_POWEROFF_TARGET,
2191                                 [5] = SPECIAL_REBOOT_TARGET,
2192                                 [6] = SPECIAL_KEXEC_TARGET
2193                         };
2194
2195                         /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
2196                         static const ManagerExitCode code_table[] = {
2197                                 [0] = MANAGER_HALT,
2198                                 [1] = MANAGER_POWEROFF,
2199                                 [2] = MANAGER_REBOOT,
2200                                 [3] = MANAGER_KEXEC
2201                         };
2202
2203                         if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
2204                             (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
2205                                 manager_start_target(m, target_table[sfsi.ssi_signo - SIGRTMIN],
2206                                                      (sfsi.ssi_signo == 1 || sfsi.ssi_signo == 2) ? JOB_ISOLATE : JOB_REPLACE);
2207                                 break;
2208                         }
2209
2210                         if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
2211                             (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(code_table)) {
2212                                 m->exit_code = code_table[sfsi.ssi_signo - SIGRTMIN - 13];
2213                                 break;
2214                         }
2215
2216                         switch (sfsi.ssi_signo - SIGRTMIN) {
2217
2218                         case 20:
2219                                 log_debug("Enabling showing of status.");
2220                                 m->show_status = true;
2221                                 break;
2222
2223                         case 21:
2224                                 log_debug("Disabling showing of status.");
2225                                 m->show_status = false;
2226                                 break;
2227
2228                         default:
2229                                 log_warning("Got unhandled signal <%s>.", strna(signal_to_string(sfsi.ssi_signo)));
2230                         }
2231                 }
2232                 }
2233         }
2234
2235         if (sigchld)
2236                 return manager_dispatch_sigchld(m);
2237
2238         return 0;
2239 }
2240
2241 static int process_event(Manager *m, struct epoll_event *ev) {
2242         int r;
2243         Watch *w;
2244
2245         assert(m);
2246         assert(ev);
2247
2248         assert(w = ev->data.ptr);
2249
2250         if (w->type == WATCH_INVALID)
2251                 return 0;
2252
2253         switch (w->type) {
2254
2255         case WATCH_SIGNAL:
2256
2257                 /* An incoming signal? */
2258                 if (ev->events != EPOLLIN)
2259                         return -EINVAL;
2260
2261                 if ((r = manager_process_signal_fd(m)) < 0)
2262                         return r;
2263
2264                 break;
2265
2266         case WATCH_NOTIFY:
2267
2268                 /* An incoming daemon notification event? */
2269                 if (ev->events != EPOLLIN)
2270                         return -EINVAL;
2271
2272                 if ((r = manager_process_notify_fd(m)) < 0)
2273                         return r;
2274
2275                 break;
2276
2277         case WATCH_FD:
2278
2279                 /* Some fd event, to be dispatched to the units */
2280                 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
2281                 break;
2282
2283         case WATCH_UNIT_TIMER:
2284         case WATCH_JOB_TIMER: {
2285                 uint64_t v;
2286                 ssize_t k;
2287
2288                 /* Some timer event, to be dispatched to the units */
2289                 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
2290
2291                         if (k < 0 && (errno == EINTR || errno == EAGAIN))
2292                                 break;
2293
2294                         return k < 0 ? -errno : -EIO;
2295                 }
2296
2297                 if (w->type == WATCH_UNIT_TIMER)
2298                         UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
2299                 else
2300                         job_timer_event(w->data.job, v, w);
2301                 break;
2302         }
2303
2304         case WATCH_MOUNT:
2305                 /* Some mount table change, intended for the mount subsystem */
2306                 mount_fd_event(m, ev->events);
2307                 break;
2308
2309         case WATCH_SWAP:
2310                 /* Some swap table change, intended for the swap subsystem */
2311                 swap_fd_event(m, ev->events);
2312                 break;
2313
2314         case WATCH_UDEV:
2315                 /* Some notification from udev, intended for the device subsystem */
2316                 device_fd_event(m, ev->events);
2317                 break;
2318
2319         case WATCH_DBUS_WATCH:
2320                 bus_watch_event(m, w, ev->events);
2321                 break;
2322
2323         case WATCH_DBUS_TIMEOUT:
2324                 bus_timeout_event(m, w, ev->events);
2325                 break;
2326
2327         default:
2328                 log_error("event type=%i", w->type);
2329                 assert_not_reached("Unknown epoll event type.");
2330         }
2331
2332         return 0;
2333 }
2334
2335 int manager_loop(Manager *m) {
2336         int r;
2337
2338         RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 50000);
2339
2340         assert(m);
2341         m->exit_code = MANAGER_RUNNING;
2342
2343         /* Release the path cache */
2344         set_free_free(m->unit_path_cache);
2345         m->unit_path_cache = NULL;
2346
2347         manager_check_finished(m);
2348
2349         /* There might still be some zombies hanging around from
2350          * before we were exec()'ed. Leat's reap them */
2351         if ((r = manager_dispatch_sigchld(m)) < 0)
2352                 return r;
2353
2354         while (m->exit_code == MANAGER_RUNNING) {
2355                 struct epoll_event event;
2356                 int n;
2357
2358                 if (!ratelimit_test(&rl)) {
2359                         /* Yay, something is going seriously wrong, pause a little */
2360                         log_warning("Looping too fast. Throttling execution a little.");
2361                         sleep(1);
2362                 }
2363
2364                 if (manager_dispatch_load_queue(m) > 0)
2365                         continue;
2366
2367                 if (manager_dispatch_run_queue(m) > 0)
2368                         continue;
2369
2370                 if (bus_dispatch(m) > 0)
2371                         continue;
2372
2373                 if (manager_dispatch_cleanup_queue(m) > 0)
2374                         continue;
2375
2376                 if (manager_dispatch_gc_queue(m) > 0)
2377                         continue;
2378
2379                 if (manager_dispatch_dbus_queue(m) > 0)
2380                         continue;
2381
2382                 if (swap_dispatch_reload(m) > 0)
2383                         continue;
2384
2385                 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2386
2387                         if (errno == EINTR)
2388                                 continue;
2389
2390                         return -errno;
2391                 }
2392
2393                 assert(n == 1);
2394
2395                 if ((r = process_event(m, &event)) < 0)
2396                         return r;
2397         }
2398
2399         return m->exit_code;
2400 }
2401
2402 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2403         char *n;
2404         Unit *u;
2405
2406         assert(m);
2407         assert(s);
2408         assert(_u);
2409
2410         if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2411                 return -EINVAL;
2412
2413         if (!(n = bus_path_unescape(s+31)))
2414                 return -ENOMEM;
2415
2416         u = manager_get_unit(m, n);
2417         free(n);
2418
2419         if (!u)
2420                 return -ENOENT;
2421
2422         *_u = u;
2423
2424         return 0;
2425 }
2426
2427 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2428         Job *j;
2429         unsigned id;
2430         int r;
2431
2432         assert(m);
2433         assert(s);
2434         assert(_j);
2435
2436         if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2437                 return -EINVAL;
2438
2439         if ((r = safe_atou(s + 30, &id)) < 0)
2440                 return r;
2441
2442         if (!(j = manager_get_job(m, id)))
2443                 return -ENOENT;
2444
2445         *_j = j;
2446
2447         return 0;
2448 }
2449
2450 void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
2451
2452 #ifdef HAVE_AUDIT
2453         char *p;
2454
2455         if (m->audit_fd < 0)
2456                 return;
2457
2458         /* Don't generate audit events if the service was already
2459          * started and we're just deserializing */
2460         if (m->n_deserializing > 0)
2461                 return;
2462
2463         if (m->running_as != MANAGER_SYSTEM)
2464                 return;
2465
2466         if (u->meta.type != UNIT_SERVICE)
2467                 return;
2468
2469         if (!(p = unit_name_to_prefix_and_instance(u->meta.id))) {
2470                 log_error("Failed to allocate unit name for audit message: %s", strerror(ENOMEM));
2471                 return;
2472         }
2473
2474         if (audit_log_user_comm_message(m->audit_fd, type, "", p, NULL, NULL, NULL, success) < 0) {
2475                 log_warning("Failed to send audit message: %m");
2476
2477                 if (errno == EPERM) {
2478                         /* We aren't allowed to send audit messages?
2479                          * Then let's not retry again, to avoid
2480                          * spamming the user with the same and same
2481                          * messages over and over. */
2482
2483                         audit_close(m->audit_fd);
2484                         m->audit_fd = -1;
2485                 }
2486         }
2487
2488         free(p);
2489 #endif
2490
2491 }
2492
2493 void manager_send_unit_plymouth(Manager *m, Unit *u) {
2494         int fd = -1;
2495         union sockaddr_union sa;
2496         int n = 0;
2497         char *message = NULL;
2498
2499         /* Don't generate plymouth events if the service was already
2500          * started and we're just deserializing */
2501         if (m->n_deserializing > 0)
2502                 return;
2503
2504         if (m->running_as != MANAGER_SYSTEM)
2505                 return;
2506
2507         if (u->meta.type != UNIT_SERVICE &&
2508             u->meta.type != UNIT_MOUNT &&
2509             u->meta.type != UNIT_SWAP)
2510                 return;
2511
2512         /* We set SOCK_NONBLOCK here so that we rather drop the
2513          * message then wait for plymouth */
2514         if ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
2515                 log_error("socket() failed: %m");
2516                 return;
2517         }
2518
2519         zero(sa);
2520         sa.sa.sa_family = AF_UNIX;
2521         strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
2522         if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
2523
2524                 if (errno != EPIPE &&
2525                     errno != EAGAIN &&
2526                     errno != ENOENT &&
2527                     errno != ECONNREFUSED &&
2528                     errno != ECONNRESET &&
2529                     errno != ECONNABORTED)
2530                         log_error("connect() failed: %m");
2531
2532                 goto finish;
2533         }
2534
2535         if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->meta.id) + 1), u->meta.id, &n) < 0) {
2536                 log_error("Out of memory");
2537                 goto finish;
2538         }
2539
2540         errno = 0;
2541         if (write(fd, message, n + 1) != n + 1) {
2542
2543                 if (errno != EPIPE &&
2544                     errno != EAGAIN &&
2545                     errno != ENOENT &&
2546                     errno != ECONNREFUSED &&
2547                     errno != ECONNRESET &&
2548                     errno != ECONNABORTED)
2549                         log_error("Failed to write Plymouth message: %m");
2550
2551                 goto finish;
2552         }
2553
2554 finish:
2555         if (fd >= 0)
2556                 close_nointr_nofail(fd);
2557
2558         free(message);
2559 }
2560
2561 void manager_dispatch_bus_name_owner_changed(
2562                 Manager *m,
2563                 const char *name,
2564                 const char* old_owner,
2565                 const char *new_owner) {
2566
2567         Unit *u;
2568
2569         assert(m);
2570         assert(name);
2571
2572         if (!(u = hashmap_get(m->watch_bus, name)))
2573                 return;
2574
2575         UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2576 }
2577
2578 void manager_dispatch_bus_query_pid_done(
2579                 Manager *m,
2580                 const char *name,
2581                 pid_t pid) {
2582
2583         Unit *u;
2584
2585         assert(m);
2586         assert(name);
2587         assert(pid >= 1);
2588
2589         if (!(u = hashmap_get(m->watch_bus, name)))
2590                 return;
2591
2592         UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2593 }
2594
2595 int manager_open_serialization(Manager *m, FILE **_f) {
2596         char *path = NULL;
2597         mode_t saved_umask;
2598         int fd;
2599         FILE *f;
2600
2601         assert(_f);
2602
2603         if (m->running_as == MANAGER_SYSTEM)
2604                 asprintf(&path, "/run/systemd/dump-%lu-XXXXXX", (unsigned long) getpid());
2605         else
2606                 asprintf(&path, "/tmp/systemd-dump-%lu-XXXXXX", (unsigned long) getpid());
2607
2608         if (!path)
2609                 return -ENOMEM;
2610
2611         saved_umask = umask(0077);
2612         fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2613         umask(saved_umask);
2614
2615         if (fd < 0) {
2616                 free(path);
2617                 return -errno;
2618         }
2619
2620         unlink(path);
2621
2622         log_debug("Serializing state to %s", path);
2623         free(path);
2624
2625         if (!(f = fdopen(fd, "w+")))
2626                 return -errno;
2627
2628         *_f = f;
2629
2630         return 0;
2631 }
2632
2633 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2634         Iterator i;
2635         Unit *u;
2636         const char *t;
2637         int r;
2638
2639         assert(m);
2640         assert(f);
2641         assert(fds);
2642
2643         fprintf(f, "current-job-id=%i\n", m->current_job_id);
2644         fprintf(f, "taint-usr=%s\n", yes_no(m->taint_usr));
2645
2646         dual_timestamp_serialize(f, "initrd-timestamp", &m->initrd_timestamp);
2647         dual_timestamp_serialize(f, "startup-timestamp", &m->startup_timestamp);
2648         dual_timestamp_serialize(f, "finish-timestamp", &m->finish_timestamp);
2649
2650         fputc('\n', f);
2651
2652         HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2653                 if (u->meta.id != t)
2654                         continue;
2655
2656                 if (!unit_can_serialize(u))
2657                         continue;
2658
2659                 /* Start marker */
2660                 fputs(u->meta.id, f);
2661                 fputc('\n', f);
2662
2663                 if ((r = unit_serialize(u, f, fds)) < 0)
2664                         return r;
2665         }
2666
2667         if (ferror(f))
2668                 return -EIO;
2669
2670         return 0;
2671 }
2672
2673 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2674         int r = 0;
2675
2676         assert(m);
2677         assert(f);
2678
2679         log_debug("Deserializing state...");
2680
2681         m->n_deserializing ++;
2682
2683         for (;;) {
2684                 char line[LINE_MAX], *l;
2685
2686                 if (!fgets(line, sizeof(line), f)) {
2687                         if (feof(f))
2688                                 r = 0;
2689                         else
2690                                 r = -errno;
2691
2692                         goto finish;
2693                 }
2694
2695                 char_array_0(line);
2696                 l = strstrip(line);
2697
2698                 if (l[0] == 0)
2699                         break;
2700
2701                 if (startswith(l, "current-job-id=")) {
2702                         uint32_t id;
2703
2704                         if (safe_atou32(l+15, &id) < 0)
2705                                 log_debug("Failed to parse current job id value %s", l+15);
2706                         else
2707                                 m->current_job_id = MAX(m->current_job_id, id);
2708                 } else if (startswith(l, "taint-usr=")) {
2709                         int b;
2710
2711                         if ((b = parse_boolean(l+10)) < 0)
2712                                 log_debug("Failed to parse taint /usr flag %s", l+10);
2713                         else
2714                                 m->taint_usr = m->taint_usr || b;
2715                 } else if (startswith(l, "initrd-timestamp="))
2716                         dual_timestamp_deserialize(l+17, &m->initrd_timestamp);
2717                 else if (startswith(l, "startup-timestamp="))
2718                         dual_timestamp_deserialize(l+18, &m->startup_timestamp);
2719                 else if (startswith(l, "finish-timestamp="))
2720                         dual_timestamp_deserialize(l+17, &m->finish_timestamp);
2721                 else
2722                         log_debug("Unknown serialization item '%s'", l);
2723         }
2724
2725         for (;;) {
2726                 Unit *u;
2727                 char name[UNIT_NAME_MAX+2];
2728
2729                 /* Start marker */
2730                 if (!fgets(name, sizeof(name), f)) {
2731                         if (feof(f))
2732                                 r = 0;
2733                         else
2734                                 r = -errno;
2735
2736                         goto finish;
2737                 }
2738
2739                 char_array_0(name);
2740
2741                 if ((r = manager_load_unit(m, strstrip(name), NULL, NULL, &u)) < 0)
2742                         goto finish;
2743
2744                 if ((r = unit_deserialize(u, f, fds)) < 0)
2745                         goto finish;
2746         }
2747
2748 finish:
2749         if (ferror(f)) {
2750                 r = -EIO;
2751                 goto finish;
2752         }
2753
2754         assert(m->n_deserializing > 0);
2755         m->n_deserializing --;
2756
2757         return r;
2758 }
2759
2760 int manager_reload(Manager *m) {
2761         int r, q;
2762         FILE *f;
2763         FDSet *fds;
2764
2765         assert(m);
2766
2767         if ((r = manager_open_serialization(m, &f)) < 0)
2768                 return r;
2769
2770         if (!(fds = fdset_new())) {
2771                 r = -ENOMEM;
2772                 goto finish;
2773         }
2774
2775         if ((r = manager_serialize(m, f, fds)) < 0)
2776                 goto finish;
2777
2778         if (fseeko(f, 0, SEEK_SET) < 0) {
2779                 r = -errno;
2780                 goto finish;
2781         }
2782
2783         /* From here on there is no way back. */
2784         manager_clear_jobs_and_units(m);
2785         manager_undo_generators(m);
2786
2787         /* Find new unit paths */
2788         lookup_paths_free(&m->lookup_paths);
2789         if ((q = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
2790                 r = q;
2791
2792         manager_run_generators(m);
2793
2794         manager_build_unit_path_cache(m);
2795
2796         m->n_deserializing ++;
2797
2798         /* First, enumerate what we can from all config files */
2799         if ((q = manager_enumerate(m)) < 0)
2800                 r = q;
2801
2802         /* Second, deserialize our stored data */
2803         if ((q = manager_deserialize(m, f, fds)) < 0)
2804                 r = q;
2805
2806         fclose(f);
2807         f = NULL;
2808
2809         /* Third, fire things up! */
2810         if ((q = manager_coldplug(m)) < 0)
2811                 r = q;
2812
2813         assert(m->n_deserializing > 0);
2814         m->n_deserializing ++;
2815
2816 finish:
2817         if (f)
2818                 fclose(f);
2819
2820         if (fds)
2821                 fdset_free(fds);
2822
2823         return r;
2824 }
2825
2826 bool manager_is_booting_or_shutting_down(Manager *m) {
2827         Unit *u;
2828
2829         assert(m);
2830
2831         /* Is the initial job still around? */
2832         if (manager_get_job(m, 1))
2833                 return true;
2834
2835         /* Is there a job for the shutdown target? */
2836         if (((u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET))))
2837                 return !!u->meta.job;
2838
2839         return false;
2840 }
2841
2842 void manager_reset_failed(Manager *m) {
2843         Unit *u;
2844         Iterator i;
2845
2846         assert(m);
2847
2848         HASHMAP_FOREACH(u, m->units, i)
2849                 unit_reset_failed(u);
2850 }
2851
2852 bool manager_unit_pending_inactive(Manager *m, const char *name) {
2853         Unit *u;
2854
2855         assert(m);
2856         assert(name);
2857
2858         /* Returns true if the unit is inactive or going down */
2859         if (!(u = manager_get_unit(m, name)))
2860                 return true;
2861
2862         return unit_pending_inactive(u);
2863 }
2864
2865 void manager_check_finished(Manager *m) {
2866         char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX];
2867
2868         assert(m);
2869
2870         if (dual_timestamp_is_set(&m->finish_timestamp))
2871                 return;
2872
2873         if (hashmap_size(m->jobs) > 0)
2874                 return;
2875
2876         dual_timestamp_get(&m->finish_timestamp);
2877
2878         if (m->running_as == MANAGER_SYSTEM && detect_container(NULL) <= 0) {
2879
2880                 if (dual_timestamp_is_set(&m->initrd_timestamp)) {
2881                         log_info("Startup finished in %s (kernel) + %s (initrd) + %s (userspace) = %s.",
2882                                  format_timespan(kernel, sizeof(kernel),
2883                                                  m->initrd_timestamp.monotonic),
2884                                  format_timespan(initrd, sizeof(initrd),
2885                                                  m->startup_timestamp.monotonic - m->initrd_timestamp.monotonic),
2886                                  format_timespan(userspace, sizeof(userspace),
2887                                                  m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2888                                  format_timespan(sum, sizeof(sum),
2889                                                  m->finish_timestamp.monotonic));
2890                 } else
2891                         log_info("Startup finished in %s (kernel) + %s (userspace) = %s.",
2892                                  format_timespan(kernel, sizeof(kernel),
2893                                                  m->startup_timestamp.monotonic),
2894                                  format_timespan(userspace, sizeof(userspace),
2895                                                  m->finish_timestamp.monotonic - m->startup_timestamp.monotonic),
2896                                  format_timespan(sum, sizeof(sum),
2897                                                  m->finish_timestamp.monotonic));
2898         } else
2899                 log_debug("Startup finished in %s.",
2900                           format_timespan(userspace, sizeof(userspace),
2901                                           m->finish_timestamp.monotonic - m->startup_timestamp.monotonic));
2902
2903 }
2904
2905 void manager_run_generators(Manager *m) {
2906         DIR *d = NULL;
2907         const char *generator_path;
2908         const char *argv[3];
2909
2910         assert(m);
2911
2912         generator_path = m->running_as == MANAGER_SYSTEM ? SYSTEM_GENERATOR_PATH : USER_GENERATOR_PATH;
2913         if (!(d = opendir(generator_path))) {
2914
2915                 if (errno == ENOENT)
2916                         return;
2917
2918                 log_error("Failed to enumerate generator directory: %m");
2919                 return;
2920         }
2921
2922         if (!m->generator_unit_path) {
2923                 const char *p;
2924                 char user_path[] = "/tmp/systemd-generator-XXXXXX";
2925
2926                 if (m->running_as == MANAGER_SYSTEM) {
2927                         p = "/run/systemd/generator";
2928
2929                         if (mkdir_p(p, 0755) < 0) {
2930                                 log_error("Failed to create generator directory: %m");
2931                                 goto finish;
2932                         }
2933
2934                 } else {
2935                         if (!(p = mkdtemp(user_path))) {
2936                                 log_error("Failed to create generator directory: %m");
2937                                 goto finish;
2938                         }
2939                 }
2940
2941                 if (!(m->generator_unit_path = strdup(p))) {
2942                         log_error("Failed to allocate generator unit path.");
2943                         goto finish;
2944                 }
2945         }
2946
2947         argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */
2948         argv[1] = m->generator_unit_path;
2949         argv[2] = NULL;
2950
2951         execute_directory(generator_path, d, (char**) argv);
2952
2953         if (rmdir(m->generator_unit_path) >= 0) {
2954                 /* Uh? we were able to remove this dir? I guess that
2955                  * means the directory was empty, hence let's shortcut
2956                  * this */
2957
2958                 free(m->generator_unit_path);
2959                 m->generator_unit_path = NULL;
2960                 goto finish;
2961         }
2962
2963         if (!strv_find(m->lookup_paths.unit_path, m->generator_unit_path)) {
2964                 char **l;
2965
2966                 if (!(l = strv_append(m->lookup_paths.unit_path, m->generator_unit_path))) {
2967                         log_error("Failed to add generator directory to unit search path: %m");
2968                         goto finish;
2969                 }
2970
2971                 strv_free(m->lookup_paths.unit_path);
2972                 m->lookup_paths.unit_path = l;
2973
2974                 log_debug("Added generator unit path %s to search path.", m->generator_unit_path);
2975         }
2976
2977 finish:
2978         if (d)
2979                 closedir(d);
2980 }
2981
2982 void manager_undo_generators(Manager *m) {
2983         assert(m);
2984
2985         if (!m->generator_unit_path)
2986                 return;
2987
2988         strv_remove(m->lookup_paths.unit_path, m->generator_unit_path);
2989         rm_rf(m->generator_unit_path, false, true);
2990
2991         free(m->generator_unit_path);
2992         m->generator_unit_path = NULL;
2993 }
2994
2995 int manager_set_default_controllers(Manager *m, char **controllers) {
2996         char **l;
2997
2998         assert(m);
2999
3000         if (!(l = strv_copy(controllers)))
3001                 return -ENOMEM;
3002
3003         strv_free(m->default_controllers);
3004         m->default_controllers = l;
3005
3006         return 0;
3007 }
3008
3009 void manager_recheck_syslog(Manager *m) {
3010         Unit *u;
3011
3012         assert(m);
3013
3014         if (m->running_as != MANAGER_SYSTEM)
3015                 return;
3016
3017         if ((u = manager_get_unit(m, SPECIAL_SYSLOG_SOCKET))) {
3018                 SocketState state;
3019
3020                 state = SOCKET(u)->state;
3021
3022                 if (state != SOCKET_DEAD &&
3023                     state != SOCKET_FAILED &&
3024                     state != SOCKET_RUNNING) {
3025
3026                         /* Hmm, the socket is not set up, or is still
3027                          * listening, let's better not try to use
3028                          * it. Note that we have no problem if the
3029                          * socket is completely down, since there
3030                          * might be a foreign /dev/log socket around
3031                          * and we want to make use of that.
3032                          */
3033
3034                         log_close_syslog();
3035                         return;
3036                 }
3037         }
3038
3039         if ((u = manager_get_unit(m, SPECIAL_SYSLOG_TARGET)))
3040                 if (TARGET(u)->state != TARGET_ACTIVE) {
3041                         log_close_syslog();
3042                         return;
3043                 }
3044
3045         /* Hmm, OK, so the socket is either fully up, or fully down,
3046          * and the target is up, then let's make use of the socket */
3047         log_open();
3048 }
3049
3050 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
3051         [MANAGER_SYSTEM] = "system",
3052         [MANAGER_USER] = "user"
3053 };
3054
3055 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);