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 #include "sd-daemon.h"
  62
  63 /* As soon as 16 units are in our GC queue, make sure to run a gc sweep */
  64 #define GC_QUEUE_ENTRIES_MAX 16
  65
  66 /* As soon as 5s passed since a unit was added to our GC queue, make sure to run a gc sweep */
  67 #define GC_QUEUE_USEC_MAX (10*USEC_PER_SEC)
  68
  69 /* Where clients shall send notification messages to */
  70 #define NOTIFY_SOCKET_SYSTEM "/run/systemd/notify"
  71 #define NOTIFY_SOCKET_USER "@/org/freedesktop/systemd1/notify"
  72
  73 static int manager_setup_notify(Manager *m) {
  74         union {
  75                 struct sockaddr sa;
  76                 struct sockaddr_un un;
  77         } sa;
  78         struct epoll_event ev;
  79         int one = 1;
  80
  81         assert(m);
  82
  83         m->notify_watch.type = WATCH_NOTIFY;
  84         if ((m->notify_watch.fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
  85                 log_error("Failed to allocate notification socket: %m");
  86                 return -errno;
  87         }
  88
  89         zero(sa);
  90         sa.sa.sa_family = AF_UNIX;
  91
  92         if (getpid() != 1)
  93                 snprintf(sa.un.sun_path, sizeof(sa.un.sun_path), NOTIFY_SOCKET_USER "/%llu", random_ull());
  94         else {
  95                 unlink(NOTIFY_SOCKET_SYSTEM);
  96                 strncpy(sa.un.sun_path, NOTIFY_SOCKET_SYSTEM, sizeof(sa.un.sun_path));
  97         }
  98
  99         if (sa.un.sun_path[0] == '@')
 100                 sa.un.sun_path[0] = 0;
 101
 102         if (bind(m->notify_watch.fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
 103                 log_error("bind() failed: %m");
 104                 return -errno;
 105         }
 106
 107         if (setsockopt(m->notify_watch.fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
 108                 log_error("SO_PASSCRED failed: %m");
 109                 return -errno;
 110         }
 111
 112         zero(ev);
 113         ev.events = EPOLLIN;
 114         ev.data.ptr = &m->notify_watch;
 115
 116         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->notify_watch.fd, &ev) < 0)
 117                 return -errno;
 118
 119         if (sa.un.sun_path[0] == 0)
 120                 sa.un.sun_path[0] = '@';
 121
 122         if (!(m->notify_socket = strdup(sa.un.sun_path)))
 123                 return -ENOMEM;
 124
 125         log_debug("Using notification socket %s", m->notify_socket);
 126
 127         return 0;
 128 }
 129
 130 static int enable_special_signals(Manager *m) {
 131         int fd;
 132
 133         assert(m);
 134
 135         /* Enable that we get SIGINT on control-alt-del */
 136         if (reboot(RB_DISABLE_CAD) < 0)
 137                 log_warning("Failed to enable ctrl-alt-del handling: %m");
 138
 139         if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY)) < 0)
 140                 log_warning("Failed to open /dev/tty0: %m");
 141         else {
 142                 /* Enable that we get SIGWINCH on kbrequest */
 143                 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
 144                         log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
 145
 146                 close_nointr_nofail(fd);
 147         }
 148
 149         return 0;
 150 }
 151
 152 static int manager_setup_signals(Manager *m) {
 153         sigset_t mask;
 154         struct epoll_event ev;
 155         struct sigaction sa;
 156
 157         assert(m);
 158
 159         /* We are not interested in SIGSTOP and friends. */
 160         zero(sa);
 161         sa.sa_handler = SIG_DFL;
 162         sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
 163         assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 164
 165         assert_se(sigemptyset(&mask) == 0);
 166
 167         sigset_add_many(&mask,
 168                         SIGCHLD,     /* Child died */
 169                         SIGTERM,     /* Reexecute daemon */
 170                         SIGHUP,      /* Reload configuration */
 171                         SIGUSR1,     /* systemd/upstart: reconnect to D-Bus */
 172                         SIGUSR2,     /* systemd: dump status */
 173                         SIGINT,      /* Kernel sends us this on control-alt-del */
 174                         SIGWINCH,    /* Kernel sends us this on kbrequest (alt-arrowup) */
 175                         SIGPWR,      /* Some kernel drivers and upsd send us this on power failure */
 176                         SIGRTMIN+0,  /* systemd: start default.target */
 177                         SIGRTMIN+1,  /* systemd: isolate rescue.target */
 178                         SIGRTMIN+2,  /* systemd: isolate emergency.target */
 179                         SIGRTMIN+3,  /* systemd: start halt.target */
 180                         SIGRTMIN+4,  /* systemd: start poweroff.target */
 181                         SIGRTMIN+5,  /* systemd: start reboot.target */
 182                         SIGRTMIN+6,  /* systemd: start kexec.target */
 183                         SIGRTMIN+13, /* systemd: Immediate halt */
 184                         SIGRTMIN+14, /* systemd: Immediate poweroff */
 185                         SIGRTMIN+15, /* systemd: Immediate reboot */
 186                         SIGRTMIN+16, /* systemd: Immediate kexec */
 187                         SIGRTMIN+20, /* systemd: enable status messages */
 188                         SIGRTMIN+21, /* systemd: disable status messages */
 189                         -1);
 190         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
 191
 192         m->signal_watch.type = WATCH_SIGNAL;
 193         if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
 194                 return -errno;
 195
 196         zero(ev);
 197         ev.events = EPOLLIN;
 198         ev.data.ptr = &m->signal_watch;
 199
 200         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
 201                 return -errno;
 202
 203         if (m->running_as == MANAGER_SYSTEM)
 204                 return enable_special_signals(m);
 205
 206         return 0;
 207 }
 208
 209 int manager_new(ManagerRunningAs running_as, Manager **_m) {
 210         Manager *m;
 211         int r = -ENOMEM;
 212
 213         assert(_m);
 214         assert(running_as >= 0);
 215         assert(running_as < _MANAGER_RUNNING_AS_MAX);
 216
 217         if (!(m = new0(Manager, 1)))
 218                 return -ENOMEM;
 219
 220         dual_timestamp_get(&m->startup_timestamp);
 221
 222         m->running_as = running_as;
 223         m->name_data_slot = m->subscribed_data_slot = -1;
 224         m->exit_code = _MANAGER_EXIT_CODE_INVALID;
 225         m->pin_cgroupfs_fd = -1;
 226
 227 #ifdef HAVE_AUDIT
 228         m->audit_fd = -1;
 229 #endif
 230
 231         m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = m->swap_watch.fd = -1;
 232         m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
 233
 234         if (!(m->environment = strv_copy(environ)))
 235                 goto fail;
 236
 237         if (!(m->default_controllers = strv_new("cpu", NULL)))
 238                 goto fail;
 239
 240         if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
 241                 goto fail;
 242
 243         if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
 244                 goto fail;
 245
 246         if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
 247                 goto fail;
 248
 249         if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
 250                 goto fail;
 251
 252         if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
 253                 goto fail;
 254
 255         if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
 256                 goto fail;
 257
 258         if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
 259                 goto fail;
 260
 261         if ((r = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
 262                 goto fail;
 263
 264         if ((r = manager_setup_signals(m)) < 0)
 265                 goto fail;
 266
 267         if ((r = manager_setup_cgroup(m)) < 0)
 268                 goto fail;
 269
 270         if ((r = manager_setup_notify(m)) < 0)
 271                 goto fail;
 272
 273         /* Try to connect to the busses, if possible. */
 274         if ((r = bus_init(m, running_as != MANAGER_SYSTEM)) < 0)
 275                 goto fail;
 276
 277 #ifdef HAVE_AUDIT
 278         if ((m->audit_fd = audit_open()) < 0)
 279                 log_error("Failed to connect to audit log: %m");
 280 #endif
 281
 282         m->taint_usr = dir_is_empty("/usr") > 0;
 283
 284         *_m = m;
 285         return 0;
 286
 287 fail:
 288         manager_free(m);
 289         return r;
 290 }
 291
 292 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
 293         Meta *meta;
 294         unsigned n = 0;
 295
 296         assert(m);
 297
 298         while ((meta = m->cleanup_queue)) {
 299                 assert(meta->in_cleanup_queue);
 300
 301                 unit_free((Unit*) meta);
 302                 n++;
 303         }
 304
 305         return n;
 306 }
 307
 308 enum {
 309         GC_OFFSET_IN_PATH,  /* This one is on the path we were traveling */
 310         GC_OFFSET_UNSURE,   /* No clue */
 311         GC_OFFSET_GOOD,     /* We still need this unit */
 312         GC_OFFSET_BAD,      /* We don't need this unit anymore */
 313         _GC_OFFSET_MAX
 314 };
 315
 316 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
 317         Iterator i;
 318         Unit *other;
 319         bool is_bad;
 320
 321         assert(u);
 322
 323         if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
 324             u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
 325             u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
 326                 return;
 327
 328         if (u->meta.in_cleanup_queue)
 329                 goto bad;
 330
 331         if (unit_check_gc(u))
 332                 goto good;
 333
 334         u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
 335
 336         is_bad = true;
 337
 338         SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
 339                 unit_gc_sweep(other, gc_marker);
 340
 341                 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
 342                         goto good;
 343
 344                 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
 345                         is_bad = false;
 346         }
 347
 348         if (is_bad)
 349                 goto bad;
 350
 351         /* We were unable to find anything out about this entry, so
 352          * let's investigate it later */
 353         u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
 354         unit_add_to_gc_queue(u);
 355         return;
 356
 357 bad:
 358         /* We definitely know that this one is not useful anymore, so
 359          * let's mark it for deletion */
 360         u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
 361         unit_add_to_cleanup_queue(u);
 362         return;
 363
 364 good:
 365         u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
 366 }
 367
 368 static unsigned manager_dispatch_gc_queue(Manager *m) {
 369         Meta *meta;
 370         unsigned n = 0;
 371         unsigned gc_marker;
 372
 373         assert(m);
 374
 375         if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
 376             (m->gc_queue_timestamp <= 0 ||
 377              (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
 378                 return 0;
 379
 380         log_debug("Running GC...");
 381
 382         m->gc_marker += _GC_OFFSET_MAX;
 383         if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
 384                 m->gc_marker = 1;
 385
 386         gc_marker = m->gc_marker;
 387
 388         while ((meta = m->gc_queue)) {
 389                 assert(meta->in_gc_queue);
 390
 391                 unit_gc_sweep((Unit*) meta, gc_marker);
 392
 393                 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
 394                 meta->in_gc_queue = false;
 395
 396                 n++;
 397
 398                 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
 399                     meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
 400                         log_debug("Collecting %s", meta->id);
 401                         meta->gc_marker = gc_marker + GC_OFFSET_BAD;
 402                         unit_add_to_cleanup_queue((Unit*) meta);
 403                 }
 404         }
 405
 406         m->n_in_gc_queue = 0;
 407         m->gc_queue_timestamp = 0;
 408
 409         return n;
 410 }
 411
 412 static void manager_clear_jobs_and_units(Manager *m) {
 413         Job *j;
 414         Unit *u;
 415
 416         assert(m);
 417
 418         while ((j = hashmap_first(m->transaction_jobs)))
 419                 job_free(j);
 420
 421         while ((u = hashmap_first(m->units)))
 422                 unit_free(u);
 423
 424         manager_dispatch_cleanup_queue(m);
 425
 426         assert(!m->load_queue);
 427         assert(!m->run_queue);
 428         assert(!m->dbus_unit_queue);
 429         assert(!m->dbus_job_queue);
 430         assert(!m->cleanup_queue);
 431         assert(!m->gc_queue);
 432
 433         assert(hashmap_isempty(m->transaction_jobs));
 434         assert(hashmap_isempty(m->jobs));
 435         assert(hashmap_isempty(m->units));
 436 }
 437
 438 void manager_free(Manager *m) {
 439         UnitType c;
 440
 441         assert(m);
 442
 443         manager_clear_jobs_and_units(m);
 444
 445         for (c = 0; c < _UNIT_TYPE_MAX; c++)
 446                 if (unit_vtable[c]->shutdown)
 447                         unit_vtable[c]->shutdown(m);
 448
 449         /* If we reexecute ourselves, we keep the root cgroup
 450          * around */
 451         manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
 452
 453         manager_undo_generators(m);
 454
 455         bus_done(m);
 456
 457         hashmap_free(m->units);
 458         hashmap_free(m->jobs);
 459         hashmap_free(m->transaction_jobs);
 460         hashmap_free(m->watch_pids);
 461         hashmap_free(m->watch_bus);
 462
 463         if (m->epoll_fd >= 0)
 464                 close_nointr_nofail(m->epoll_fd);
 465         if (m->signal_watch.fd >= 0)
 466                 close_nointr_nofail(m->signal_watch.fd);
 467         if (m->notify_watch.fd >= 0)
 468                 close_nointr_nofail(m->notify_watch.fd);
 469
 470 #ifdef HAVE_AUDIT
 471         if (m->audit_fd >= 0)
 472                 audit_close(m->audit_fd);
 473 #endif
 474
 475         free(m->notify_socket);
 476
 477         lookup_paths_free(&m->lookup_paths);
 478         strv_free(m->environment);
 479
 480         strv_free(m->default_controllers);
 481
 482         hashmap_free(m->cgroup_bondings);
 483         set_free_free(m->unit_path_cache);
 484
 485         free(m);
 486 }
 487
 488 int manager_enumerate(Manager *m) {
 489         int r = 0, q;
 490         UnitType c;
 491
 492         assert(m);
 493
 494         /* Let's ask every type to load all units from disk/kernel
 495          * that it might know */
 496         for (c = 0; c < _UNIT_TYPE_MAX; c++)
 497                 if (unit_vtable[c]->enumerate)
 498                         if ((q = unit_vtable[c]->enumerate(m)) < 0)
 499                                 r = q;
 500
 501         manager_dispatch_load_queue(m);
 502         return r;
 503 }
 504
 505 int manager_coldplug(Manager *m) {
 506         int r = 0, q;
 507         Iterator i;
 508         Unit *u;
 509         char *k;
 510
 511         assert(m);
 512
 513         /* Then, let's set up their initial state. */
 514         HASHMAP_FOREACH_KEY(u, k, m->units, i) {
 515
 516                 /* ignore aliases */
 517                 if (u->meta.id != k)
 518                         continue;
 519
 520                 if ((q = unit_coldplug(u)) < 0)
 521                         r = q;
 522         }
 523
 524         return r;
 525 }
 526
 527 static void manager_build_unit_path_cache(Manager *m) {
 528         char **i;
 529         DIR *d = NULL;
 530         int r;
 531
 532         assert(m);
 533
 534         set_free_free(m->unit_path_cache);
 535
 536         if (!(m->unit_path_cache = set_new(string_hash_func, string_compare_func))) {
 537                 log_error("Failed to allocate unit path cache.");
 538                 return;
 539         }
 540
 541         /* This simply builds a list of files we know exist, so that
 542          * we don't always have to go to disk */
 543
 544         STRV_FOREACH(i, m->lookup_paths.unit_path) {
 545                 struct dirent *de;
 546
 547                 if (!(d = opendir(*i))) {
 548                         log_error("Failed to open directory: %m");
 549                         continue;
 550                 }
 551
 552                 while ((de = readdir(d))) {
 553                         char *p;
 554
 555                         if (ignore_file(de->d_name))
 556                                 continue;
 557
 558                         if (asprintf(&p, "%s/%s", streq(*i, "/") ? "" : *i, de->d_name) < 0) {
 559                                 r = -ENOMEM;
 560                                 goto fail;
 561                         }
 562
 563                         if ((r = set_put(m->unit_path_cache, p)) < 0) {
 564                                 free(p);
 565                                 goto fail;
 566                         }
 567                 }
 568
 569                 closedir(d);
 570                 d = NULL;
 571         }
 572
 573         return;
 574
 575 fail:
 576         log_error("Failed to build unit path cache: %s", strerror(-r));
 577
 578         set_free_free(m->unit_path_cache);
 579         m->unit_path_cache = NULL;
 580
 581         if (d)
 582                 closedir(d);
 583 }
 584
 585 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
 586         int r, q;
 587
 588         assert(m);
 589
 590         manager_run_generators(m);
 591
 592         manager_build_unit_path_cache(m);
 593
 594         /* If we will deserialize make sure that during enumeration
 595          * this is already known, so we increase the counter here
 596          * already */
 597         if (serialization)
 598                 m->n_deserializing ++;
 599
 600         /* First, enumerate what we can from all config files */
 601         r = manager_enumerate(m);
 602
 603         /* Second, deserialize if there is something to deserialize */
 604         if (serialization)
 605                 if ((q = manager_deserialize(m, serialization, fds)) < 0)
 606                         r = q;
 607
 608         /* Third, fire things up! */
 609         if ((q = manager_coldplug(m)) < 0)
 610                 r = q;
 611
 612         if (serialization) {
 613                 assert(m->n_deserializing > 0);
 614                 m->n_deserializing --;
 615         }
 616
 617         return r;
 618 }
 619
 620 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
 621         assert(m);
 622         assert(j);
 623
 624         /* Deletes one job from the transaction */
 625
 626         manager_transaction_unlink_job(m, j, delete_dependencies);
 627
 628         if (!j->installed)
 629                 job_free(j);
 630 }
 631
 632 static void transaction_delete_unit(Manager *m, Unit *u) {
 633         Job *j;
 634
 635         /* Deletes all jobs associated with a certain unit from the
 636          * transaction */
 637
 638         while ((j = hashmap_get(m->transaction_jobs, u)))
 639                 transaction_delete_job(m, j, true);
 640 }
 641
 642 static void transaction_clean_dependencies(Manager *m) {
 643         Iterator i;
 644         Job *j;
 645
 646         assert(m);
 647
 648         /* Drops all dependencies of all installed jobs */
 649
 650         HASHMAP_FOREACH(j, m->jobs, i) {
 651                 while (j->subject_list)
 652                         job_dependency_free(j->subject_list);
 653                 while (j->object_list)
 654                         job_dependency_free(j->object_list);
 655         }
 656
 657         assert(!m->transaction_anchor);
 658 }
 659
 660 static void transaction_abort(Manager *m) {
 661         Job *j;
 662
 663         assert(m);
 664
 665         while ((j = hashmap_first(m->transaction_jobs)))
 666                 if (j->installed)
 667                         transaction_delete_job(m, j, true);
 668                 else
 669                         job_free(j);
 670
 671         assert(hashmap_isempty(m->transaction_jobs));
 672
 673         transaction_clean_dependencies(m);
 674 }
 675
 676 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
 677         JobDependency *l;
 678
 679         assert(m);
 680
 681         /* A recursive sweep through the graph that marks all units
 682          * that matter to the anchor job, i.e. are directly or
 683          * indirectly a dependency of the anchor job via paths that
 684          * are fully marked as mattering. */
 685
 686         if (j)
 687                 l = j->subject_list;
 688         else
 689                 l = m->transaction_anchor;
 690
 691         LIST_FOREACH(subject, l, l) {
 692
 693                 /* This link does not matter */
 694                 if (!l->matters)
 695                         continue;
 696
 697                 /* This unit has already been marked */
 698                 if (l->object->generation == generation)
 699                         continue;
 700
 701                 l->object->matters_to_anchor = true;
 702                 l->object->generation = generation;
 703
 704                 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
 705         }
 706 }
 707
 708 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
 709         JobDependency *l, *last;
 710
 711         assert(j);
 712         assert(other);
 713         assert(j->unit == other->unit);
 714         assert(!j->installed);
 715
 716         /* Merges 'other' into 'j' and then deletes j. */
 717
 718         j->type = t;
 719         j->state = JOB_WAITING;
 720         j->override = j->override || other->override;
 721
 722         j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
 723
 724         /* Patch us in as new owner of the JobDependency objects */
 725         last = NULL;
 726         LIST_FOREACH(subject, l, other->subject_list) {
 727                 assert(l->subject == other);
 728                 l->subject = j;
 729                 last = l;
 730         }
 731
 732         /* Merge both lists */
 733         if (last) {
 734                 last->subject_next = j->subject_list;
 735                 if (j->subject_list)
 736                         j->subject_list->subject_prev = last;
 737                 j->subject_list = other->subject_list;
 738         }
 739
 740         /* Patch us in as new owner of the JobDependency objects */
 741         last = NULL;
 742         LIST_FOREACH(object, l, other->object_list) {
 743                 assert(l->object == other);
 744                 l->object = j;
 745                 last = l;
 746         }
 747
 748         /* Merge both lists */
 749         if (last) {
 750                 last->object_next = j->object_list;
 751                 if (j->object_list)
 752                         j->object_list->object_prev = last;
 753                 j->object_list = other->object_list;
 754         }
 755
 756         /* Kill the other job */
 757         other->subject_list = NULL;
 758         other->object_list = NULL;
 759         transaction_delete_job(m, other, true);
 760 }
 761 static bool job_is_conflicted_by(Job *j) {
 762         JobDependency *l;
 763
 764         assert(j);
 765
 766         /* Returns true if this job is pulled in by a least one
 767          * ConflictedBy dependency. */
 768
 769         LIST_FOREACH(object, l, j->object_list)
 770                 if (l->conflicts)
 771                         return true;
 772
 773         return false;
 774 }
 775
 776 static int delete_one_unmergeable_job(Manager *m, Job *j) {
 777         Job *k;
 778
 779         assert(j);
 780
 781         /* Tries to delete one item in the linked list
 782          * j->transaction_next->transaction_next->... that conflicts
 783          * with another one, in an attempt to make an inconsistent
 784          * transaction work. */
 785
 786         /* We rely here on the fact that if a merged with b does not
 787          * merge with c, either a or b merge with c neither */
 788         LIST_FOREACH(transaction, j, j)
 789                 LIST_FOREACH(transaction, k, j->transaction_next) {
 790                         Job *d;
 791
 792                         /* Is this one mergeable? Then skip it */
 793                         if (job_type_is_mergeable(j->type, k->type))
 794                                 continue;
 795
 796                         /* Ok, we found two that conflict, let's see if we can
 797                          * drop one of them */
 798                         if (!j->matters_to_anchor && !k->matters_to_anchor) {
 799
 800                                 /* Both jobs don't matter, so let's
 801                                  * find the one that is smarter to
 802                                  * remove. Let's think positive and
 803                                  * rather remove stops then starts --
 804                                  * except if something is being
 805                                  * stopped because it is conflicted by
 806                                  * another unit in which case we
 807                                  * rather remove the start. */
 808
 809                                 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)));
 810                                 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)));
 811
 812                                 if (j->type == JOB_STOP) {
 813
 814                                         if (job_is_conflicted_by(j))
 815                                                 d = k;
 816                                         else
 817                                                 d = j;
 818
 819                                 } else if (k->type == JOB_STOP) {
 820
 821                                         if (job_is_conflicted_by(k))
 822                                                 d = j;
 823                                         else
 824                                                 d = k;
 825                                 } else
 826                                         d = j;
 827
 828                         } else if (!j->matters_to_anchor)
 829                                 d = j;
 830                         else if (!k->matters_to_anchor)
 831                                 d = k;
 832                         else
 833                                 return -ENOEXEC;
 834
 835                         /* Ok, we can drop one, so let's do so. */
 836                         log_debug("Fixing conflicting jobs by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
 837                         transaction_delete_job(m, d, true);
 838                         return 0;
 839                 }
 840
 841         return -EINVAL;
 842 }
 843
 844 static int transaction_merge_jobs(Manager *m, DBusError *e) {
 845         Job *j;
 846         Iterator i;
 847         int r;
 848
 849         assert(m);
 850
 851         /* First step, check whether any of the jobs for one specific
 852          * task conflict. If so, try to drop one of them. */
 853         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 854                 JobType t;
 855                 Job *k;
 856
 857                 t = j->type;
 858                 LIST_FOREACH(transaction, k, j->transaction_next) {
 859                         if (job_type_merge(&t, k->type) >= 0)
 860                                 continue;
 861
 862                         /* OK, we could not merge all jobs for this
 863                          * action. Let's see if we can get rid of one
 864                          * of them */
 865
 866                         if ((r = delete_one_unmergeable_job(m, j)) >= 0)
 867                                 /* Ok, we managed to drop one, now
 868                                  * let's ask our callers to call us
 869                                  * again after garbage collecting */
 870                                 return -EAGAIN;
 871
 872                         /* We couldn't merge anything. Failure */
 873                         dbus_set_error(e, BUS_ERROR_TRANSACTION_JOBS_CONFLICTING, "Transaction contains conflicting jobs '%s' and '%s' for %s. Probably contradicting requirement dependencies configured.",
 874                                        job_type_to_string(t), job_type_to_string(k->type), k->unit->meta.id);
 875                         return r;
 876                 }
 877         }
 878
 879         /* Second step, merge the jobs. */
 880         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 881                 JobType t = j->type;
 882                 Job *k;
 883
 884                 /* Merge all transactions */
 885                 LIST_FOREACH(transaction, k, j->transaction_next)
 886                         assert_se(job_type_merge(&t, k->type) == 0);
 887
 888                 /* If an active job is mergeable, merge it too */
 889                 if (j->unit->meta.job)
 890                         job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
 891
 892                 while ((k = j->transaction_next)) {
 893                         if (j->installed) {
 894                                 transaction_merge_and_delete_job(m, k, j, t);
 895                                 j = k;
 896                         } else
 897                                 transaction_merge_and_delete_job(m, j, k, t);
 898                 }
 899
 900                 assert(!j->transaction_next);
 901                 assert(!j->transaction_prev);
 902         }
 903
 904         return 0;
 905 }
 906
 907 static void transaction_drop_redundant(Manager *m) {
 908         bool again;
 909
 910         assert(m);
 911
 912         /* Goes through the transaction and removes all jobs that are
 913          * a noop */
 914
 915         do {
 916                 Job *j;
 917                 Iterator i;
 918
 919                 again = false;
 920
 921                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 922                         bool changes_something = false;
 923                         Job *k;
 924
 925                         LIST_FOREACH(transaction, k, j) {
 926
 927                                 if (!job_is_anchor(k) &&
 928                                     (k->installed || job_type_is_redundant(k->type, unit_active_state(k->unit))) &&
 929                                     (!k->unit->meta.job || !job_type_is_conflicting(k->type, k->unit->meta.job->type)))
 930                                         continue;
 931
 932                                 changes_something = true;
 933                                 break;
 934                         }
 935
 936                         if (changes_something)
 937                                 continue;
 938
 939                         /* log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type)); */
 940                         transaction_delete_job(m, j, false);
 941                         again = true;
 942                         break;
 943                 }
 944
 945         } while (again);
 946 }
 947
 948 static bool unit_matters_to_anchor(Unit *u, Job *j) {
 949         assert(u);
 950         assert(!j->transaction_prev);
 951
 952         /* Checks whether at least one of the jobs for this unit
 953          * matters to the anchor. */
 954
 955         LIST_FOREACH(transaction, j, j)
 956                 if (j->matters_to_anchor)
 957                         return true;
 958
 959         return false;
 960 }
 961
 962 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation, DBusError *e) {
 963         Iterator i;
 964         Unit *u;
 965         int r;
 966
 967         assert(m);
 968         assert(j);
 969         assert(!j->transaction_prev);
 970
 971         /* Does a recursive sweep through the ordering graph, looking
 972          * for a cycle. If we find cycle we try to break it. */
 973
 974         /* Have we seen this before? */
 975         if (j->generation == generation) {
 976                 Job *k, *delete;
 977
 978                 /* If the marker is NULL we have been here already and
 979                  * decided the job was loop-free from here. Hence
 980                  * shortcut things and return right-away. */
 981                 if (!j->marker)
 982                         return 0;
 983
 984                 /* So, the marker is not NULL and we already have been
 985                  * here. We have a cycle. Let's try to break it. We go
 986                  * backwards in our path and try to find a suitable
 987                  * job to remove. We use the marker to find our way
 988                  * back, since smart how we are we stored our way back
 989                  * in there. */
 990                 log_warning("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
 991
 992                 delete = NULL;
 993                 for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
 994
 995                         log_info("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
 996
 997                         if (!delete &&
 998                             !k->installed &&
 999                             !unit_matters_to_anchor(k->unit, k)) {
1000                                 /* Ok, we can drop this one, so let's
1001                                  * do so. */
1002                                 delete = k;
1003                         }
1004
1005                         /* Check if this in fact was the beginning of
1006                          * the cycle */
1007                         if (k == j)
1008                                 break;
1009                 }
1010
1011
1012                 if (delete) {
1013                         log_warning("Breaking ordering cycle by deleting job %s/%s", delete->unit->meta.id, job_type_to_string(delete->type));
1014                         transaction_delete_unit(m, delete->unit);
1015                         return -EAGAIN;
1016                 }
1017
1018                 log_error("Unable to break cycle");
1019
1020                 dbus_set_error(e, BUS_ERROR_TRANSACTION_ORDER_IS_CYCLIC, "Transaction order is cyclic. See system logs for details.");
1021                 return -ENOEXEC;
1022         }
1023
1024         /* Make the marker point to where we come from, so that we can
1025          * find our way backwards if we want to break a cycle. We use
1026          * a special marker for the beginning: we point to
1027          * ourselves. */
1028         j->marker = from ? from : j;
1029         j->generation = generation;
1030
1031         /* We assume that the the dependencies are bidirectional, and
1032          * hence can ignore UNIT_AFTER */
1033         SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
1034                 Job *o;
1035
1036                 /* Is there a job for this unit? */
1037                 if (!(o = hashmap_get(m->transaction_jobs, u)))
1038
1039                         /* Ok, there is no job for this in the
1040                          * transaction, but maybe there is already one
1041                          * running? */
1042                         if (!(o = u->meta.job))
1043                                 continue;
1044
1045                 if ((r = transaction_verify_order_one(m, o, j, generation, e)) < 0)
1046                         return r;
1047         }
1048
1049         /* Ok, let's backtrack, and remember that this entry is not on
1050          * our path anymore. */
1051         j->marker = NULL;
1052
1053         return 0;
1054 }
1055
1056 static int transaction_verify_order(Manager *m, unsigned *generation, DBusError *e) {
1057         Job *j;
1058         int r;
1059         Iterator i;
1060         unsigned g;
1061
1062         assert(m);
1063         assert(generation);
1064
1065         /* Check if the ordering graph is cyclic. If it is, try to fix
1066          * that up by dropping one of the jobs. */
1067
1068         g = (*generation)++;
1069
1070         HASHMAP_FOREACH(j, m->transaction_jobs, i)
1071                 if ((r = transaction_verify_order_one(m, j, NULL, g, e)) < 0)
1072                         return r;
1073
1074         return 0;
1075 }
1076
1077 static void transaction_collect_garbage(Manager *m) {
1078         bool again;
1079
1080         assert(m);
1081
1082         /* Drop jobs that are not required by any other job */
1083
1084         do {
1085                 Iterator i;
1086                 Job *j;
1087
1088                 again = false;
1089
1090                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1091                         if (j->object_list) {
1092                                 /* log_debug("Keeping job %s/%s because of %s/%s", */
1093                                 /*           j->unit->meta.id, job_type_to_string(j->type), */
1094                                 /*           j->object_list->subject ? j->object_list->subject->unit->meta.id : "root", */
1095                                 /*           j->object_list->subject ? job_type_to_string(j->object_list->subject->type) : "root"); */
1096                                 continue;
1097                         }
1098
1099                         /* log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type)); */
1100                         transaction_delete_job(m, j, true);
1101                         again = true;
1102                         break;
1103                 }
1104
1105         } while (again);
1106 }
1107
1108 static int transaction_is_destructive(Manager *m, DBusError *e) {
1109         Iterator i;
1110         Job *j;
1111
1112         assert(m);
1113
1114         /* Checks whether applying this transaction means that
1115          * existing jobs would be replaced */
1116
1117         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1118
1119                 /* Assume merged */
1120                 assert(!j->transaction_prev);
1121                 assert(!j->transaction_next);
1122
1123                 if (j->unit->meta.job &&
1124                     j->unit->meta.job != j &&
1125                     !job_type_is_superset(j->type, j->unit->meta.job->type)) {
1126
1127                         dbus_set_error(e, BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE, "Transaction is destructive.");
1128                         return -EEXIST;
1129                 }
1130         }
1131
1132         return 0;
1133 }
1134
1135 static void transaction_minimize_impact(Manager *m) {
1136         bool again;
1137         assert(m);
1138
1139         /* Drops all unnecessary jobs that reverse already active jobs
1140          * or that stop a running service. */
1141
1142         do {
1143                 Job *j;
1144                 Iterator i;
1145
1146                 again = false;
1147
1148                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1149                         LIST_FOREACH(transaction, j, j) {
1150                                 bool stops_running_service, changes_existing_job;
1151
1152                                 /* If it matters, we shouldn't drop it */
1153                                 if (j->matters_to_anchor)
1154                                         continue;
1155
1156                                 /* Would this stop a running service?
1157                                  * Would this change an existing job?
1158                                  * If so, let's drop this entry */
1159
1160                                 stops_running_service =
1161                                         j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1162
1163                                 changes_existing_job =
1164                                         j->unit->meta.job &&
1165                                         job_type_is_conflicting(j->type, j->unit->meta.job->type);
1166
1167                                 if (!stops_running_service && !changes_existing_job)
1168                                         continue;
1169
1170                                 if (stops_running_service)
1171                                         log_debug("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1172
1173                                 if (changes_existing_job)
1174                                         log_debug("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1175
1176                                 /* Ok, let's get rid of this */
1177                                 log_debug("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1178
1179                                 transaction_delete_job(m, j, true);
1180                                 again = true;
1181                                 break;
1182                         }
1183
1184                         if (again)
1185                                 break;
1186                 }
1187
1188         } while (again);
1189 }
1190
1191 static int transaction_apply(Manager *m, JobMode mode) {
1192         Iterator i;
1193         Job *j;
1194         int r;
1195
1196         /* Moves the transaction jobs to the set of active jobs */
1197
1198         if (mode == JOB_ISOLATE) {
1199
1200                 /* When isolating first kill all installed jobs which
1201                  * aren't part of the new transaction */
1202                 HASHMAP_FOREACH(j, m->jobs, i) {
1203                         assert(j->installed);
1204
1205                         if (hashmap_get(m->transaction_jobs, j->unit))
1206                                 continue;
1207
1208                         job_finish_and_invalidate(j, JOB_CANCELED);
1209                 }
1210         }
1211
1212         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1213                 /* Assume merged */
1214                 assert(!j->transaction_prev);
1215                 assert(!j->transaction_next);
1216
1217                 if (j->installed)
1218                         continue;
1219
1220                 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1221                         goto rollback;
1222         }
1223
1224         while ((j = hashmap_steal_first(m->transaction_jobs))) {
1225                 if (j->installed) {
1226                         /* log_debug("Skipping already installed job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id); */
1227                         continue;
1228                 }
1229
1230                 if (j->unit->meta.job)
1231                         job_free(j->unit->meta.job);
1232
1233                 j->unit->meta.job = j;
1234                 j->installed = true;
1235                 m->n_installed_jobs ++;
1236
1237                 /* We're fully installed. Now let's free data we don't
1238                  * need anymore. */
1239
1240                 assert(!j->transaction_next);
1241                 assert(!j->transaction_prev);
1242
1243                 job_add_to_run_queue(j);
1244                 job_add_to_dbus_queue(j);
1245                 job_start_timer(j);
1246
1247                 log_debug("Installed new job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id);
1248         }
1249
1250         /* As last step, kill all remaining job dependencies. */
1251         transaction_clean_dependencies(m);
1252
1253         return 0;
1254
1255 rollback:
1256
1257         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1258                 if (j->installed)
1259                         continue;
1260
1261                 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1262         }
1263
1264         return r;
1265 }
1266
1267 static int transaction_activate(Manager *m, JobMode mode, DBusError *e) {
1268         int r;
1269         unsigned generation = 1;
1270
1271         assert(m);
1272
1273         /* This applies the changes recorded in transaction_jobs to
1274          * the actual list of jobs, if possible. */
1275
1276         /* First step: figure out which jobs matter */
1277         transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1278
1279         /* Second step: Try not to stop any running services if
1280          * we don't have to. Don't try to reverse running
1281          * jobs if we don't have to. */
1282         if (mode == JOB_FAIL)
1283                 transaction_minimize_impact(m);
1284
1285         /* Third step: Drop redundant jobs */
1286         transaction_drop_redundant(m);
1287
1288         for (;;) {
1289                 /* Fourth step: Let's remove unneeded jobs that might
1290                  * be lurking. */
1291                 if (mode != JOB_ISOLATE)
1292                         transaction_collect_garbage(m);
1293
1294                 /* Fifth step: verify order makes sense and correct
1295                  * cycles if necessary and possible */
1296                 if ((r = transaction_verify_order(m, &generation, e)) >= 0)
1297                         break;
1298
1299                 if (r != -EAGAIN) {
1300                         log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r));
1301                         goto rollback;
1302                 }
1303
1304                 /* Let's see if the resulting transaction ordering
1305                  * graph is still cyclic... */
1306         }
1307
1308         for (;;) {
1309                 /* Sixth step: let's drop unmergeable entries if
1310                  * necessary and possible, merge entries we can
1311                  * merge */
1312                 if ((r = transaction_merge_jobs(m, e)) >= 0)
1313                         break;
1314
1315                 if (r != -EAGAIN) {
1316                         log_warning("Requested transaction contains unmergeable jobs: %s", bus_error(e, r));
1317                         goto rollback;
1318                 }
1319
1320                 /* Seventh step: an entry got dropped, let's garbage
1321                  * collect its dependencies. */
1322                 if (mode != JOB_ISOLATE)
1323                         transaction_collect_garbage(m);
1324
1325                 /* Let's see if the resulting transaction still has
1326                  * unmergeable entries ... */
1327         }
1328
1329         /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1330         transaction_drop_redundant(m);
1331
1332         /* Ninth step: check whether we can actually apply this */
1333         if (mode == JOB_FAIL)
1334                 if ((r = transaction_is_destructive(m, e)) < 0) {
1335                         log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r));
1336                         goto rollback;
1337                 }
1338
1339         /* Tenth step: apply changes */
1340         if ((r = transaction_apply(m, mode)) < 0) {
1341                 log_warning("Failed to apply transaction: %s", strerror(-r));
1342                 goto rollback;
1343         }
1344
1345         assert(hashmap_isempty(m->transaction_jobs));
1346         assert(!m->transaction_anchor);
1347
1348         return 0;
1349
1350 rollback:
1351         transaction_abort(m);
1352         return r;
1353 }
1354
1355 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1356         Job *j, *f;
1357
1358         assert(m);
1359         assert(unit);
1360
1361         /* Looks for an existing prospective job and returns that. If
1362          * it doesn't exist it is created and added to the prospective
1363          * jobs list. */
1364
1365         f = hashmap_get(m->transaction_jobs, unit);
1366
1367         LIST_FOREACH(transaction, j, f) {
1368                 assert(j->unit == unit);
1369
1370                 if (j->type == type) {
1371                         if (is_new)
1372                                 *is_new = false;
1373                         return j;
1374                 }
1375         }
1376
1377         if (unit->meta.job && unit->meta.job->type == type)
1378                 j = unit->meta.job;
1379         else if (!(j = job_new(m, type, unit)))
1380                 return NULL;
1381
1382         j->generation = 0;
1383         j->marker = NULL;
1384         j->matters_to_anchor = false;
1385         j->override = override;
1386
1387         LIST_PREPEND(Job, transaction, f, j);
1388
1389         if (hashmap_replace(m->transaction_jobs, unit, f) < 0) {
1390                 job_free(j);
1391                 return NULL;
1392         }
1393
1394         if (is_new)
1395                 *is_new = true;
1396
1397         /* log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type)); */
1398
1399         return j;
1400 }
1401
1402 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1403         assert(m);
1404         assert(j);
1405
1406         if (j->transaction_prev)
1407                 j->transaction_prev->transaction_next = j->transaction_next;
1408         else if (j->transaction_next)
1409                 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1410         else
1411                 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1412
1413         if (j->transaction_next)
1414                 j->transaction_next->transaction_prev = j->transaction_prev;
1415
1416         j->transaction_prev = j->transaction_next = NULL;
1417
1418         while (j->subject_list)
1419                 job_dependency_free(j->subject_list);
1420
1421         while (j->object_list) {
1422                 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1423
1424                 job_dependency_free(j->object_list);
1425
1426                 if (other && delete_dependencies) {
1427                         log_debug("Deleting job %s/%s as dependency of job %s/%s",
1428                                   other->unit->meta.id, job_type_to_string(other->type),
1429                                   j->unit->meta.id, job_type_to_string(j->type));
1430                         transaction_delete_job(m, other, delete_dependencies);
1431                 }
1432         }
1433 }
1434
1435 static int transaction_add_job_and_dependencies(
1436                 Manager *m,
1437                 JobType type,
1438                 Unit *unit,
1439                 Job *by,
1440                 bool matters,
1441                 bool override,
1442                 bool conflicts,
1443                 bool ignore_requirements,
1444                 bool ignore_order,
1445                 DBusError *e,
1446                 Job **_ret) {
1447         Job *ret;
1448         Iterator i;
1449         Unit *dep;
1450         int r;
1451         bool is_new;
1452
1453         assert(m);
1454         assert(type < _JOB_TYPE_MAX);
1455         assert(unit);
1456
1457         /* log_debug("Pulling in %s/%s from %s/%s", */
1458         /*           unit->meta.id, job_type_to_string(type), */
1459         /*           by ? by->unit->meta.id : "NA", */
1460         /*           by ? job_type_to_string(by->type) : "NA"); */
1461
1462         if (unit->meta.load_state != UNIT_LOADED &&
1463             unit->meta.load_state != UNIT_ERROR &&
1464             unit->meta.load_state != UNIT_MASKED) {
1465                 dbus_set_error(e, BUS_ERROR_LOAD_FAILED, "Unit %s is not loaded properly.", unit->meta.id);
1466                 return -EINVAL;
1467         }
1468
1469         if (type != JOB_STOP && unit->meta.load_state == UNIT_ERROR) {
1470                 dbus_set_error(e, BUS_ERROR_LOAD_FAILED,
1471                                "Unit %s failed to load: %s. "
1472                                "See system logs and 'systemctl status %s' for details.",
1473                                unit->meta.id,
1474                                strerror(-unit->meta.load_error),
1475                                unit->meta.id);
1476                 return -EINVAL;
1477         }
1478
1479         if (type != JOB_STOP && unit->meta.load_state == UNIT_MASKED) {
1480                 dbus_set_error(e, BUS_ERROR_MASKED, "Unit %s is masked.", unit->meta.id);
1481                 return -EINVAL;
1482         }
1483
1484         if (!unit_job_is_applicable(unit, type)) {
1485                 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);
1486                 return -EBADR;
1487         }
1488
1489         /* First add the job. */
1490         if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1491                 return -ENOMEM;
1492
1493         ret->ignore_order = ret->ignore_order || ignore_order;
1494
1495         /* Then, add a link to the job. */
1496         if (!job_dependency_new(by, ret, matters, conflicts))
1497                 return -ENOMEM;
1498
1499         if (is_new && !ignore_requirements) {
1500                 Set *following;
1501
1502                 /* If we are following some other unit, make sure we
1503                  * add all dependencies of everybody following. */
1504                 if (unit_following_set(ret->unit, &following) > 0) {
1505                         SET_FOREACH(dep, following, i)
1506                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
1507                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1508
1509                                         if (e)
1510                                                 dbus_error_free(e);
1511                                 }
1512
1513                         set_free(following);
1514                 }
1515
1516                 /* Finally, recursively add in all dependencies. */
1517                 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1518                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1519                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1520                                         if (r != -EBADR)
1521                                                 goto fail;
1522
1523                                         if (e)
1524                                                 dbus_error_free(e);
1525                                 }
1526
1527                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BIND_TO], i)
1528                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1529
1530                                         if (r != -EBADR)
1531                                                 goto fail;
1532
1533                                         if (e)
1534                                                 dbus_error_free(e);
1535                                 }
1536
1537                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1538                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
1539                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1540
1541                                         if (e)
1542                                                 dbus_error_free(e);
1543                                 }
1544
1545                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1546                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, false, false, ignore_order, e, NULL)) < 0) {
1547                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1548
1549                                         if (e)
1550                                                 dbus_error_free(e);
1551                                 }
1552
1553                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1554                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1555
1556                                         if (r != -EBADR)
1557                                                 goto fail;
1558
1559                                         if (e)
1560                                                 dbus_error_free(e);
1561                                 }
1562
1563                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1564                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
1565                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1566
1567                                         if (e)
1568                                                 dbus_error_free(e);
1569                                 }
1570
1571                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1572                                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, true, false, ignore_order, e, NULL)) < 0) {
1573
1574                                         if (r != -EBADR)
1575                                                 goto fail;
1576
1577                                         if (e)
1578                                                 dbus_error_free(e);
1579                                 }
1580
1581                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTED_BY], i)
1582                                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
1583                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1584
1585                                         if (e)
1586                                                 dbus_error_free(e);
1587                                 }
1588
1589                 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1590
1591                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1592                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1593
1594                                         if (r != -EBADR)
1595                                                 goto fail;
1596
1597                                         if (e)
1598                                                 dbus_error_free(e);
1599                                 }
1600
1601                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BOUND_BY], i)
1602                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1603
1604                                         if (r != -EBADR)
1605                                                 goto fail;
1606
1607                                         if (e)
1608                                                 dbus_error_free(e);
1609                                 }
1610                 }
1611
1612                 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1613         }
1614
1615         if (_ret)
1616                 *_ret = ret;
1617
1618         return 0;
1619
1620 fail:
1621         return r;
1622 }
1623
1624 static int transaction_add_isolate_jobs(Manager *m) {
1625         Iterator i;
1626         Unit *u;
1627         char *k;
1628         int r;
1629
1630         assert(m);
1631
1632         HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1633
1634                 /* ignore aliases */
1635                 if (u->meta.id != k)
1636                         continue;
1637
1638                 if (u->meta.ignore_on_isolate)
1639                         continue;
1640
1641                 /* No need to stop inactive jobs */
1642                 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)) && !u->meta.job)
1643                         continue;
1644
1645                 /* Is there already something listed for this? */
1646                 if (hashmap_get(m->transaction_jobs, u))
1647                         continue;
1648
1649                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, false, false, false, NULL, NULL)) < 0)
1650                         log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1651         }
1652
1653         return 0;
1654 }
1655
1656 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, DBusError *e, Job **_ret) {
1657         int r;
1658         Job *ret;
1659
1660         assert(m);
1661         assert(type < _JOB_TYPE_MAX);
1662         assert(unit);
1663         assert(mode < _JOB_MODE_MAX);
1664
1665         if (mode == JOB_ISOLATE && type != JOB_START) {
1666                 dbus_set_error(e, BUS_ERROR_INVALID_JOB_MODE, "Isolate is only valid for start.");
1667                 return -EINVAL;
1668         }
1669
1670         if (mode == JOB_ISOLATE && !unit->meta.allow_isolate) {
1671                 dbus_set_error(e, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
1672                 return -EPERM;
1673         }
1674
1675         log_debug("Trying to enqueue job %s/%s/%s", unit->meta.id, job_type_to_string(type), job_mode_to_string(mode));
1676
1677         if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, false,
1678                                                       mode == JOB_IGNORE_DEPENDENCIES || mode == JOB_IGNORE_REQUIREMENTS,
1679                                                       mode == JOB_IGNORE_DEPENDENCIES, e, &ret)) < 0) {
1680                 transaction_abort(m);
1681                 return r;
1682         }
1683
1684         if (mode == JOB_ISOLATE)
1685                 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1686                         transaction_abort(m);
1687                         return r;
1688                 }
1689
1690         if ((r = transaction_activate(m, mode, e)) < 0)
1691                 return r;
1692
1693         log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1694
1695         if (_ret)
1696                 *_ret = ret;
1697
1698         return 0;
1699 }
1700
1701 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, DBusError *e, Job **_ret) {
1702         Unit *unit;
1703         int r;
1704
1705         assert(m);
1706         assert(type < _JOB_TYPE_MAX);
1707         assert(name);
1708         assert(mode < _JOB_MODE_MAX);
1709
1710         if ((r = manager_load_unit(m, name, NULL, NULL, &unit)) < 0)
1711                 return r;
1712
1713         return manager_add_job(m, type, unit, mode, override, e, _ret);
1714 }
1715
1716 Job *manager_get_job(Manager *m, uint32_t id) {
1717         assert(m);
1718
1719         return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1720 }
1721
1722 Unit *manager_get_unit(Manager *m, const char *name) {
1723         assert(m);
1724         assert(name);
1725
1726         return hashmap_get(m->units, name);
1727 }
1728
1729 unsigned manager_dispatch_load_queue(Manager *m) {
1730         Meta *meta;
1731         unsigned n = 0;
1732
1733         assert(m);
1734
1735         /* Make sure we are not run recursively */
1736         if (m->dispatching_load_queue)
1737                 return 0;
1738
1739         m->dispatching_load_queue = true;
1740
1741         /* Dispatches the load queue. Takes a unit from the queue and
1742          * tries to load its data until the queue is empty */
1743
1744         while ((meta = m->load_queue)) {
1745                 assert(meta->in_load_queue);
1746
1747                 unit_load((Unit*) meta);
1748                 n++;
1749         }
1750
1751         m->dispatching_load_queue = false;
1752         return n;
1753 }
1754
1755 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1756         Unit *ret;
1757         int r;
1758
1759         assert(m);
1760         assert(name || path);
1761
1762         /* This will prepare the unit for loading, but not actually
1763          * load anything from disk. */
1764
1765         if (path && !is_path(path)) {
1766                 dbus_set_error(e, BUS_ERROR_INVALID_PATH, "Path %s is not absolute.", path);
1767                 return -EINVAL;
1768         }
1769
1770         if (!name)
1771                 name = file_name_from_path(path);
1772
1773         if (!unit_name_is_valid(name, false)) {
1774                 dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
1775                 return -EINVAL;
1776         }
1777
1778         if ((ret = manager_get_unit(m, name))) {
1779                 *_ret = ret;
1780                 return 1;
1781         }
1782
1783         if (!(ret = unit_new(m)))
1784                 return -ENOMEM;
1785
1786         if (path)
1787                 if (!(ret->meta.fragment_path = strdup(path))) {
1788                         unit_free(ret);
1789                         return -ENOMEM;
1790                 }
1791
1792         if ((r = unit_add_name(ret, name)) < 0) {
1793                 unit_free(ret);
1794                 return r;
1795         }
1796
1797         unit_add_to_load_queue(ret);
1798         unit_add_to_dbus_queue(ret);
1799         unit_add_to_gc_queue(ret);
1800
1801         if (_ret)
1802                 *_ret = ret;
1803
1804         return 0;
1805 }
1806
1807 int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1808         int r;
1809
1810         assert(m);
1811
1812         /* This will load the service information files, but not actually
1813          * start any services or anything. */
1814
1815         if ((r = manager_load_unit_prepare(m, name, path, e, _ret)) != 0)
1816                 return r;
1817
1818         manager_dispatch_load_queue(m);
1819
1820         if (_ret)
1821                 *_ret = unit_follow_merge(*_ret);
1822
1823         return 0;
1824 }
1825
1826 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1827         Iterator i;
1828         Job *j;
1829
1830         assert(s);
1831         assert(f);
1832
1833         HASHMAP_FOREACH(j, s->jobs, i)
1834                 job_dump(j, f, prefix);
1835 }
1836
1837 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1838         Iterator i;
1839         Unit *u;
1840         const char *t;
1841
1842         assert(s);
1843         assert(f);
1844
1845         HASHMAP_FOREACH_KEY(u, t, s->units, i)
1846                 if (u->meta.id == t)
1847                         unit_dump(u, f, prefix);
1848 }
1849
1850 void manager_clear_jobs(Manager *m) {
1851         Job *j;
1852
1853         assert(m);
1854
1855         transaction_abort(m);
1856
1857         while ((j = hashmap_first(m->jobs)))
1858                 job_finish_and_invalidate(j, JOB_CANCELED);
1859 }
1860
1861 unsigned manager_dispatch_run_queue(Manager *m) {
1862         Job *j;
1863         unsigned n = 0;
1864
1865         if (m->dispatching_run_queue)
1866                 return 0;
1867
1868         m->dispatching_run_queue = true;
1869
1870         while ((j = m->run_queue)) {
1871                 assert(j->installed);
1872                 assert(j->in_run_queue);
1873
1874                 job_run_and_invalidate(j);
1875                 n++;
1876         }
1877
1878         m->dispatching_run_queue = false;
1879         return n;
1880 }
1881
1882 unsigned manager_dispatch_dbus_queue(Manager *m) {
1883         Job *j;
1884         Meta *meta;
1885         unsigned n = 0;
1886
1887         assert(m);
1888
1889         if (m->dispatching_dbus_queue)
1890                 return 0;
1891
1892         m->dispatching_dbus_queue = true;
1893
1894         while ((meta = m->dbus_unit_queue)) {
1895                 assert(meta->in_dbus_queue);
1896
1897                 bus_unit_send_change_signal((Unit*) meta);
1898                 n++;
1899         }
1900
1901         while ((j = m->dbus_job_queue)) {
1902                 assert(j->in_dbus_queue);
1903
1904                 bus_job_send_change_signal(j);
1905                 n++;
1906         }
1907
1908         m->dispatching_dbus_queue = false;
1909         return n;
1910 }
1911
1912 static int manager_process_notify_fd(Manager *m) {
1913         ssize_t n;
1914
1915         assert(m);
1916
1917         for (;;) {
1918                 char buf[4096];
1919                 struct msghdr msghdr;
1920                 struct iovec iovec;
1921                 struct ucred *ucred;
1922                 union {
1923                         struct cmsghdr cmsghdr;
1924                         uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1925                 } control;
1926                 Unit *u;
1927                 char **tags;
1928
1929                 zero(iovec);
1930                 iovec.iov_base = buf;
1931                 iovec.iov_len = sizeof(buf)-1;
1932
1933                 zero(control);
1934                 zero(msghdr);
1935                 msghdr.msg_iov = &iovec;
1936                 msghdr.msg_iovlen = 1;
1937                 msghdr.msg_control = &control;
1938                 msghdr.msg_controllen = sizeof(control);
1939
1940                 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1941                         if (n >= 0)
1942                                 return -EIO;
1943
1944                         if (errno == EAGAIN || errno == EINTR)
1945                                 break;
1946
1947                         return -errno;
1948                 }
1949
1950                 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1951                     control.cmsghdr.cmsg_level != SOL_SOCKET ||
1952                     control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1953                     control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1954                         log_warning("Received notify message without credentials. Ignoring.");
1955                         continue;
1956                 }
1957
1958                 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1959
1960                 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(ucred->pid))))
1961                         if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1962                                 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1963                                 continue;
1964                         }
1965
1966                 assert((size_t) n < sizeof(buf));
1967                 buf[n] = 0;
1968                 if (!(tags = strv_split(buf, "\n\r")))
1969                         return -ENOMEM;
1970
1971                 log_debug("Got notification message for unit %s", u->meta.id);
1972
1973                 if (UNIT_VTABLE(u)->notify_message)
1974                         UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
1975
1976                 strv_free(tags);
1977         }
1978
1979         return 0;
1980 }
1981
1982 static int manager_dispatch_sigchld(Manager *m) {
1983         assert(m);
1984
1985         for (;;) {
1986                 siginfo_t si;
1987                 Unit *u;
1988                 int r;
1989
1990                 zero(si);
1991
1992                 /* First we call waitd() for a PID and do not reap the
1993                  * zombie. That way we can still access /proc/$PID for
1994                  * it while it is a zombie. */
1995                 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1996
1997                         if (errno == ECHILD)
1998                                 break;
1999
2000                         if (errno == EINTR)
2001                                 continue;
2002
2003                         return -errno;
2004                 }
2005
2006                 if (si.si_pid <= 0)
2007                         break;
2008
2009                 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
2010                         char *name = NULL;
2011
2012                         get_process_name(si.si_pid, &name);
2013                         log_debug("Got SIGCHLD for process %lu (%s)", (unsigned long) si.si_pid, strna(name));
2014                         free(name);
2015                 }
2016
2017                 /* Let's flush any message the dying child might still
2018                  * have queued for us. This ensures that the process
2019                  * still exists in /proc so that we can figure out
2020                  * which cgroup and hence unit it belongs to. */
2021                 if ((r = manager_process_notify_fd(m)) < 0)
2022                         return r;
2023
2024                 /* And now figure out the unit this belongs to */
2025                 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(si.si_pid))))
2026                         u = cgroup_unit_by_pid(m, si.si_pid);
2027
2028                 /* And now, we actually reap the zombie. */
2029                 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
2030                         if (errno == EINTR)
2031                                 continue;
2032
2033                         return -errno;
2034                 }
2035
2036                 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
2037                         continue;
2038
2039                 log_debug("Child %lu died (code=%s, status=%i/%s)",
2040                           (long unsigned) si.si_pid,
2041                           sigchld_code_to_string(si.si_code),
2042                           si.si_status,
2043                           strna(si.si_code == CLD_EXITED
2044                                 ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
2045                                 : signal_to_string(si.si_status)));
2046
2047                 if (!u)
2048                         continue;
2049
2050                 log_debug("Child %lu belongs to %s", (long unsigned) si.si_pid, u->meta.id);
2051
2052                 hashmap_remove(m->watch_pids, LONG_TO_PTR(si.si_pid));
2053                 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
2054         }
2055
2056         return 0;
2057 }
2058
2059 static int manager_start_target(Manager *m, const char *name, JobMode mode) {
2060         int r;
2061         DBusError error;
2062
2063         dbus_error_init(&error);
2064
2065         log_debug("Activating special unit %s", name);
2066
2067         if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL)) < 0)
2068                 log_error("Failed to enqueue %s job: %s", name, bus_error(&error, r));
2069
2070         dbus_error_free(&error);
2071
2072         return r;
2073 }
2074
2075 static int manager_process_signal_fd(Manager *m) {
2076         ssize_t n;
2077         struct signalfd_siginfo sfsi;
2078         bool sigchld = false;
2079
2080         assert(m);
2081
2082         for (;;) {
2083                 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
2084
2085                         if (n >= 0)
2086                                 return -EIO;
2087
2088                         if (errno == EINTR || errno == EAGAIN)
2089                                 break;
2090
2091                         return -errno;
2092                 }
2093
2094                 if (sfsi.ssi_pid > 0) {
2095                         char *p = NULL;
2096
2097                         get_process_name(sfsi.ssi_pid, &p);
2098
2099                         log_debug("Received SIG%s from PID %lu (%s).",
2100                                   strna(signal_to_string(sfsi.ssi_signo)),
2101                                   (unsigned long) sfsi.ssi_pid, strna(p));
2102                         free(p);
2103                 } else
2104                         log_debug("Received SIG%s.", strna(signal_to_string(sfsi.ssi_signo)));
2105
2106                 switch (sfsi.ssi_signo) {
2107
2108                 case SIGCHLD:
2109                         sigchld = true;
2110                         break;
2111
2112                 case SIGTERM:
2113                         if (m->running_as == MANAGER_SYSTEM) {
2114                                 /* This is for compatibility with the
2115                                  * original sysvinit */
2116                                 m->exit_code = MANAGER_REEXECUTE;
2117                                 break;
2118                         }
2119
2120                         /* Fall through */
2121
2122                 case SIGINT:
2123                         if (m->running_as == MANAGER_SYSTEM) {
2124                                 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
2125                                 break;
2126                         }
2127
2128                         /* Run the exit target if there is one, if not, just exit. */
2129                         if (manager_start_target(m, SPECIAL_EXIT_TARGET, JOB_REPLACE) < 0) {
2130                                 m->exit_code = MANAGER_EXIT;
2131                                 return 0;
2132                         }
2133
2134                         break;
2135
2136                 case SIGWINCH:
2137                         if (m->running_as == MANAGER_SYSTEM)
2138                                 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
2139
2140                         /* This is a nop on non-init */
2141                         break;
2142
2143                 case SIGPWR:
2144                         if (m->running_as == MANAGER_SYSTEM)
2145                                 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
2146
2147                         /* This is a nop on non-init */
2148                         break;
2149
2150                 case SIGUSR1: {
2151                         Unit *u;
2152
2153                         u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
2154
2155                         if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
2156                                 log_info("Trying to reconnect to bus...");
2157                                 bus_init(m, true);
2158                         }
2159
2160                         if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
2161                                 log_info("Loading D-Bus service...");
2162                                 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
2163                         }
2164
2165                         break;
2166                 }
2167
2168                 case SIGUSR2: {
2169                         FILE *f;
2170                         char *dump = NULL;
2171                         size_t size;
2172
2173                         if (!(f = open_memstream(&dump, &size))) {
2174                                 log_warning("Failed to allocate memory stream.");
2175                                 break;
2176                         }
2177
2178                         manager_dump_units(m, f, "\t");
2179                         manager_dump_jobs(m, f, "\t");
2180
2181                         if (ferror(f)) {
2182                                 fclose(f);
2183                                 free(dump);
2184                                 log_warning("Failed to write status stream");
2185                                 break;
2186                         }
2187
2188                         fclose(f);
2189                         log_dump(LOG_INFO, dump);
2190                         free(dump);
2191
2192                         break;
2193                 }
2194
2195                 case SIGHUP:
2196                         m->exit_code = MANAGER_RELOAD;
2197                         break;
2198
2199                 default: {
2200                         /* Starting SIGRTMIN+0 */
2201                         static const char * const target_table[] = {
2202                                 [0] = SPECIAL_DEFAULT_TARGET,
2203                                 [1] = SPECIAL_RESCUE_TARGET,
2204                                 [2] = SPECIAL_EMERGENCY_TARGET,
2205                                 [3] = SPECIAL_HALT_TARGET,
2206                                 [4] = SPECIAL_POWEROFF_TARGET,
2207                                 [5] = SPECIAL_REBOOT_TARGET,
2208                                 [6] = SPECIAL_KEXEC_TARGET
2209                         };
2210
2211                         /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
2212                         static const ManagerExitCode code_table[] = {
2213                                 [0] = MANAGER_HALT,
2214                                 [1] = MANAGER_POWEROFF,
2215                                 [2] = MANAGER_REBOOT,
2216                                 [3] = MANAGER_KEXEC
2217                         };
2218
2219                         if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
2220                             (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
2221                                 manager_start_target(m, target_table[sfsi.ssi_signo - SIGRTMIN],
2222                                                      (sfsi.ssi_signo == 1 || sfsi.ssi_signo == 2) ? JOB_ISOLATE : JOB_REPLACE);
2223                                 break;
2224                         }
2225
2226                         if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
2227                             (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(code_table)) {
2228                                 m->exit_code = code_table[sfsi.ssi_signo - SIGRTMIN - 13];
2229                                 break;
2230                         }
2231
2232                         switch (sfsi.ssi_signo - SIGRTMIN) {
2233
2234                         case 20:
2235                                 log_debug("Enabling showing of status.");
2236                                 m->show_status = true;
2237                                 break;
2238
2239                         case 21:
2240                                 log_debug("Disabling showing of status.");
2241                                 m->show_status = false;
2242                                 break;
2243
2244                         default:
2245                                 log_warning("Got unhandled signal <%s>.", strna(signal_to_string(sfsi.ssi_signo)));
2246                         }
2247                 }
2248                 }
2249         }
2250
2251         if (sigchld)
2252                 return manager_dispatch_sigchld(m);
2253
2254         return 0;
2255 }
2256
2257 static int process_event(Manager *m, struct epoll_event *ev) {
2258         int r;
2259         Watch *w;
2260
2261         assert(m);
2262         assert(ev);
2263
2264         assert_se(w = ev->data.ptr);
2265
2266         if (w->type == WATCH_INVALID)
2267                 return 0;
2268
2269         switch (w->type) {
2270
2271         case WATCH_SIGNAL:
2272
2273                 /* An incoming signal? */
2274                 if (ev->events != EPOLLIN)
2275                         return -EINVAL;
2276
2277                 if ((r = manager_process_signal_fd(m)) < 0)
2278                         return r;
2279
2280                 break;
2281
2282         case WATCH_NOTIFY:
2283
2284                 /* An incoming daemon notification event? */
2285                 if (ev->events != EPOLLIN)
2286                         return -EINVAL;
2287
2288                 if ((r = manager_process_notify_fd(m)) < 0)
2289                         return r;
2290
2291                 break;
2292
2293         case WATCH_FD:
2294
2295                 /* Some fd event, to be dispatched to the units */
2296                 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
2297                 break;
2298
2299         case WATCH_UNIT_TIMER:
2300         case WATCH_JOB_TIMER: {
2301                 uint64_t v;
2302                 ssize_t k;
2303
2304                 /* Some timer event, to be dispatched to the units */
2305                 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
2306
2307                         if (k < 0 && (errno == EINTR || errno == EAGAIN))
2308                                 break;
2309
2310                         return k < 0 ? -errno : -EIO;
2311                 }
2312
2313                 if (w->type == WATCH_UNIT_TIMER)
2314                         UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
2315                 else
2316                         job_timer_event(w->data.job, v, w);
2317                 break;
2318         }
2319
2320         case WATCH_MOUNT:
2321                 /* Some mount table change, intended for the mount subsystem */
2322                 mount_fd_event(m, ev->events);
2323                 break;
2324
2325         case WATCH_SWAP:
2326                 /* Some swap table change, intended for the swap subsystem */
2327                 swap_fd_event(m, ev->events);
2328                 break;
2329
2330         case WATCH_UDEV:
2331                 /* Some notification from udev, intended for the device subsystem */
2332                 device_fd_event(m, ev->events);
2333                 break;
2334
2335         case WATCH_DBUS_WATCH:
2336                 bus_watch_event(m, w, ev->events);
2337                 break;
2338
2339         case WATCH_DBUS_TIMEOUT:
2340                 bus_timeout_event(m, w, ev->events);
2341                 break;
2342
2343         default:
2344                 log_error("event type=%i", w->type);
2345                 assert_not_reached("Unknown epoll event type.");
2346         }
2347
2348         return 0;
2349 }
2350
2351 int manager_loop(Manager *m) {
2352         int r;
2353
2354         RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 50000);
2355
2356         assert(m);
2357         m->exit_code = MANAGER_RUNNING;
2358
2359         /* Release the path cache */
2360         set_free_free(m->unit_path_cache);
2361         m->unit_path_cache = NULL;
2362
2363         manager_check_finished(m);
2364
2365         /* There might still be some zombies hanging around from
2366          * before we were exec()'ed. Leat's reap them */
2367         if ((r = manager_dispatch_sigchld(m)) < 0)
2368                 return r;
2369
2370         while (m->exit_code == MANAGER_RUNNING) {
2371                 struct epoll_event event;
2372                 int n;
2373
2374                 if (!ratelimit_test(&rl)) {
2375                         /* Yay, something is going seriously wrong, pause a little */
2376                         log_warning("Looping too fast. Throttling execution a little.");
2377                         sleep(1);
2378                 }
2379
2380                 if (manager_dispatch_load_queue(m) > 0)
2381                         continue;
2382
2383                 if (manager_dispatch_run_queue(m) > 0)
2384                         continue;
2385
2386                 if (bus_dispatch(m) > 0)
2387                         continue;
2388
2389                 if (manager_dispatch_cleanup_queue(m) > 0)
2390                         continue;
2391
2392                 if (manager_dispatch_gc_queue(m) > 0)
2393                         continue;
2394
2395                 if (manager_dispatch_dbus_queue(m) > 0)
2396                         continue;
2397
2398                 if (swap_dispatch_reload(m) > 0)
2399                         continue;
2400
2401                 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2402
2403                         if (errno == EINTR)
2404                                 continue;
2405
2406                         return -errno;
2407                 }
2408
2409                 assert(n == 1);
2410
2411                 if ((r = process_event(m, &event)) < 0)
2412                         return r;
2413         }
2414
2415         return m->exit_code;
2416 }
2417
2418 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2419         char *n;
2420         Unit *u;
2421
2422         assert(m);
2423         assert(s);
2424         assert(_u);
2425
2426         if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2427                 return -EINVAL;
2428
2429         if (!(n = bus_path_unescape(s+31)))
2430                 return -ENOMEM;
2431
2432         u = manager_get_unit(m, n);
2433         free(n);
2434
2435         if (!u)
2436                 return -ENOENT;
2437
2438         *_u = u;
2439
2440         return 0;
2441 }
2442
2443 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2444         Job *j;
2445         unsigned id;
2446         int r;
2447
2448         assert(m);
2449         assert(s);
2450         assert(_j);
2451
2452         if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2453                 return -EINVAL;
2454
2455         if ((r = safe_atou(s + 30, &id)) < 0)
2456                 return r;
2457
2458         if (!(j = manager_get_job(m, id)))
2459                 return -ENOENT;
2460
2461         *_j = j;
2462
2463         return 0;
2464 }
2465
2466 void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
2467
2468 #ifdef HAVE_AUDIT
2469         char *p;
2470
2471         if (m->audit_fd < 0)
2472                 return;
2473
2474         /* Don't generate audit events if the service was already
2475          * started and we're just deserializing */
2476         if (m->n_deserializing > 0)
2477                 return;
2478
2479         if (m->running_as != MANAGER_SYSTEM)
2480                 return;
2481
2482         if (u->meta.type != UNIT_SERVICE)
2483                 return;
2484
2485         if (!(p = unit_name_to_prefix_and_instance(u->meta.id))) {
2486                 log_error("Failed to allocate unit name for audit message: %s", strerror(ENOMEM));
2487                 return;
2488         }
2489
2490         if (audit_log_user_comm_message(m->audit_fd, type, "", p, NULL, NULL, NULL, success) < 0) {
2491                 log_warning("Failed to send audit message: %m");
2492
2493                 if (errno == EPERM) {
2494                         /* We aren't allowed to send audit messages?
2495                          * Then let's not retry again, to avoid
2496                          * spamming the user with the same and same
2497                          * messages over and over. */
2498
2499                         audit_close(m->audit_fd);
2500                         m->audit_fd = -1;
2501                 }
2502         }
2503
2504         free(p);
2505 #endif
2506
2507 }
2508
2509 void manager_send_unit_plymouth(Manager *m, Unit *u) {
2510         int fd = -1;
2511         union sockaddr_union sa;
2512         int n = 0;
2513         char *message = NULL;
2514
2515         /* Don't generate plymouth events if the service was already
2516          * started and we're just deserializing */
2517         if (m->n_deserializing > 0)
2518                 return;
2519
2520         if (m->running_as != MANAGER_SYSTEM)
2521                 return;
2522
2523         if (u->meta.type != UNIT_SERVICE &&
2524             u->meta.type != UNIT_MOUNT &&
2525             u->meta.type != UNIT_SWAP)
2526                 return;
2527
2528         /* We set SOCK_NONBLOCK here so that we rather drop the
2529          * message then wait for plymouth */
2530         if ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
2531                 log_error("socket() failed: %m");
2532                 return;
2533         }
2534
2535         zero(sa);
2536         sa.sa.sa_family = AF_UNIX;
2537         strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
2538         if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
2539
2540                 if (errno != EPIPE &&
2541                     errno != EAGAIN &&
2542                     errno != ENOENT &&
2543                     errno != ECONNREFUSED &&
2544                     errno != ECONNRESET &&
2545                     errno != ECONNABORTED)
2546                         log_error("connect() failed: %m");
2547
2548                 goto finish;
2549         }
2550
2551         if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->meta.id) + 1), u->meta.id, &n) < 0) {
2552                 log_error("Out of memory");
2553                 goto finish;
2554         }
2555
2556         errno = 0;
2557         if (write(fd, message, n + 1) != n + 1) {
2558
2559                 if (errno != EPIPE &&
2560                     errno != EAGAIN &&
2561                     errno != ENOENT &&
2562                     errno != ECONNREFUSED &&
2563                     errno != ECONNRESET &&
2564                     errno != ECONNABORTED)
2565                         log_error("Failed to write Plymouth message: %m");
2566
2567                 goto finish;
2568         }
2569
2570 finish:
2571         if (fd >= 0)
2572                 close_nointr_nofail(fd);
2573
2574         free(message);
2575 }
2576
2577 void manager_dispatch_bus_name_owner_changed(
2578                 Manager *m,
2579                 const char *name,
2580                 const char* old_owner,
2581                 const char *new_owner) {
2582
2583         Unit *u;
2584
2585         assert(m);
2586         assert(name);
2587
2588         if (!(u = hashmap_get(m->watch_bus, name)))
2589                 return;
2590
2591         UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2592 }
2593
2594 void manager_dispatch_bus_query_pid_done(
2595                 Manager *m,
2596                 const char *name,
2597                 pid_t pid) {
2598
2599         Unit *u;
2600
2601         assert(m);
2602         assert(name);
2603         assert(pid >= 1);
2604
2605         if (!(u = hashmap_get(m->watch_bus, name)))
2606                 return;
2607
2608         UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2609 }
2610
2611 int manager_open_serialization(Manager *m, FILE **_f) {
2612         char *path = NULL;
2613         mode_t saved_umask;
2614         int fd;
2615         FILE *f;
2616
2617         assert(_f);
2618
2619         if (m->running_as == MANAGER_SYSTEM)
2620                 asprintf(&path, "/run/systemd/dump-%lu-XXXXXX", (unsigned long) getpid());
2621         else
2622                 asprintf(&path, "/tmp/systemd-dump-%lu-XXXXXX", (unsigned long) getpid());
2623
2624         if (!path)
2625                 return -ENOMEM;
2626
2627         saved_umask = umask(0077);
2628         fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2629         umask(saved_umask);
2630
2631         if (fd < 0) {
2632                 free(path);
2633                 return -errno;
2634         }
2635
2636         unlink(path);
2637
2638         log_debug("Serializing state to %s", path);
2639         free(path);
2640
2641         if (!(f = fdopen(fd, "w+")))
2642                 return -errno;
2643
2644         *_f = f;
2645
2646         return 0;
2647 }
2648
2649 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2650         Iterator i;
2651         Unit *u;
2652         const char *t;
2653         int r;
2654
2655         assert(m);
2656         assert(f);
2657         assert(fds);
2658
2659         m->n_serializing ++;
2660
2661         fprintf(f, "current-job-id=%i\n", m->current_job_id);
2662         fprintf(f, "taint-usr=%s\n", yes_no(m->taint_usr));
2663
2664         dual_timestamp_serialize(f, "initrd-timestamp", &m->initrd_timestamp);
2665         dual_timestamp_serialize(f, "startup-timestamp", &m->startup_timestamp);
2666         dual_timestamp_serialize(f, "finish-timestamp", &m->finish_timestamp);
2667
2668         fputc('\n', f);
2669
2670         HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2671                 if (u->meta.id != t)
2672                         continue;
2673
2674                 if (!unit_can_serialize(u))
2675                         continue;
2676
2677                 /* Start marker */
2678                 fputs(u->meta.id, f);
2679                 fputc('\n', f);
2680
2681                 if ((r = unit_serialize(u, f, fds)) < 0) {
2682                         m->n_serializing --;
2683                         return r;
2684                 }
2685         }
2686
2687         assert(m->n_serializing > 0);
2688         m->n_serializing --;
2689
2690         if (ferror(f))
2691                 return -EIO;
2692
2693         r = bus_fdset_add_all(m, fds);
2694         if (r < 0)
2695                 return r;
2696
2697         return 0;
2698 }
2699
2700 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2701         int r = 0;
2702
2703         assert(m);
2704         assert(f);
2705
2706         log_debug("Deserializing state...");
2707
2708         m->n_deserializing ++;
2709
2710         for (;;) {
2711                 char line[LINE_MAX], *l;
2712
2713                 if (!fgets(line, sizeof(line), f)) {
2714                         if (feof(f))
2715                                 r = 0;
2716                         else
2717                                 r = -errno;
2718
2719                         goto finish;
2720                 }
2721
2722                 char_array_0(line);
2723                 l = strstrip(line);
2724
2725                 if (l[0] == 0)
2726                         break;
2727
2728                 if (startswith(l, "current-job-id=")) {
2729                         uint32_t id;
2730
2731                         if (safe_atou32(l+15, &id) < 0)
2732                                 log_debug("Failed to parse current job id value %s", l+15);
2733                         else
2734                                 m->current_job_id = MAX(m->current_job_id, id);
2735                 } else if (startswith(l, "taint-usr=")) {
2736                         int b;
2737
2738                         if ((b = parse_boolean(l+10)) < 0)
2739                                 log_debug("Failed to parse taint /usr flag %s", l+10);
2740                         else
2741                                 m->taint_usr = m->taint_usr || b;
2742                 } else if (startswith(l, "initrd-timestamp="))
2743                         dual_timestamp_deserialize(l+17, &m->initrd_timestamp);
2744                 else if (startswith(l, "startup-timestamp="))
2745                         dual_timestamp_deserialize(l+18, &m->startup_timestamp);
2746                 else if (startswith(l, "finish-timestamp="))
2747                         dual_timestamp_deserialize(l+17, &m->finish_timestamp);
2748                 else
2749                         log_debug("Unknown serialization item '%s'", l);
2750         }
2751
2752         for (;;) {
2753                 Unit *u;
2754                 char name[UNIT_NAME_MAX+2];
2755
2756                 /* Start marker */
2757                 if (!fgets(name, sizeof(name), f)) {
2758                         if (feof(f))
2759                                 r = 0;
2760                         else
2761                                 r = -errno;
2762
2763                         goto finish;
2764                 }
2765
2766                 char_array_0(name);
2767
2768                 if ((r = manager_load_unit(m, strstrip(name), NULL, NULL, &u)) < 0)
2769                         goto finish;
2770
2771                 if ((r = unit_deserialize(u, f, fds)) < 0)
2772                         goto finish;
2773         }
2774
2775 finish:
2776         if (ferror(f)) {
2777                 r = -EIO;
2778                 goto finish;
2779         }
2780
2781         assert(m->n_deserializing > 0);
2782         m->n_deserializing --;
2783
2784         return r;
2785 }
2786
2787 int manager_reload(Manager *m) {
2788         int r, q;
2789         FILE *f;
2790         FDSet *fds;
2791
2792         assert(m);
2793
2794         if ((r = manager_open_serialization(m, &f)) < 0)
2795                 return r;
2796
2797         m->n_serializing ++;
2798
2799         if (!(fds = fdset_new())) {
2800                 m->n_serializing --;
2801                 r = -ENOMEM;
2802                 goto finish;
2803         }
2804
2805         if ((r = manager_serialize(m, f, fds)) < 0) {
2806                 m->n_serializing --;
2807                 goto finish;
2808         }
2809
2810         if (fseeko(f, 0, SEEK_SET) < 0) {
2811                 m->n_serializing --;
2812                 r = -errno;
2813                 goto finish;
2814         }
2815
2816         /* From here on there is no way back. */
2817         manager_clear_jobs_and_units(m);
2818         manager_undo_generators(m);
2819
2820         assert(m->n_serializing > 0);
2821         m->n_serializing --;
2822
2823         /* Find new unit paths */
2824         lookup_paths_free(&m->lookup_paths);
2825         if ((q = lookup_paths_init(&m->lookup_paths, m->running_as)) < 0)
2826                 r = q;
2827
2828         manager_run_generators(m);
2829
2830         manager_build_unit_path_cache(m);
2831
2832         m->n_deserializing ++;
2833
2834         /* First, enumerate what we can from all config files */
2835         if ((q = manager_enumerate(m)) < 0)
2836                 r = q;
2837
2838         /* Second, deserialize our stored data */
2839         if ((q = manager_deserialize(m, f, fds)) < 0)
2840                 r = q;
2841
2842         fclose(f);
2843         f = NULL;
2844
2845         /* Third, fire things up! */
2846         if ((q = manager_coldplug(m)) < 0)
2847                 r = q;
2848
2849         assert(m->n_deserializing > 0);
2850         m->n_deserializing--;
2851
2852 finish:
2853         if (f)
2854                 fclose(f);
2855
2856         if (fds)
2857                 fdset_free(fds);
2858
2859         return r;
2860 }
2861
2862 bool manager_is_booting_or_shutting_down(Manager *m) {
2863         Unit *u;
2864
2865         assert(m);
2866
2867         /* Is the initial job still around? */
2868         if (manager_get_job(m, 1))
2869                 return true;
2870
2871         /* Is there a job for the shutdown target? */
2872         if (((u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET))))
2873                 return !!u->meta.job;
2874
2875         return false;
2876 }
2877
2878 void manager_reset_failed(Manager *m) {
2879         Unit *u;
2880         Iterator i;
2881
2882         assert(m);
2883
2884         HASHMAP_FOREACH(u, m->units, i)
2885                 unit_reset_failed(u);
2886 }
2887
2888 bool manager_unit_pending_inactive(Manager *m, const char *name) {
2889         Unit *u;
2890
2891         assert(m);
2892         assert(name);
2893
2894         /* Returns true if the unit is inactive or going down */
2895         if (!(u = manager_get_unit(m, name)))
2896                 return true;
2897
2898         return unit_pending_inactive(u);
2899 }
2900
2901 void manager_check_finished(Manager *m) {
2902         char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX];
2903         usec_t kernel_usec = 0, initrd_usec = 0, userspace_usec = 0, total_usec = 0;
2904
2905         assert(m);
2906
2907         if (dual_timestamp_is_set(&m->finish_timestamp))
2908                 return;
2909
2910         if (hashmap_size(m->jobs) > 0)
2911                 return;
2912
2913         dual_timestamp_get(&m->finish_timestamp);
2914
2915         if (m->running_as == MANAGER_SYSTEM && detect_container(NULL) <= 0) {
2916
2917                 userspace_usec = m->finish_timestamp.monotonic - m->startup_timestamp.monotonic;
2918                 total_usec = m->finish_timestamp.monotonic;
2919
2920                 if (dual_timestamp_is_set(&m->initrd_timestamp)) {
2921
2922                         kernel_usec = m->initrd_timestamp.monotonic;
2923                         initrd_usec = m->startup_timestamp.monotonic - m->initrd_timestamp.monotonic;
2924
2925                         log_info("Startup finished in %s (kernel) + %s (initrd) + %s (userspace) = %s.",
2926                                  format_timespan(kernel, sizeof(kernel), kernel_usec),
2927                                  format_timespan(initrd, sizeof(initrd), initrd_usec),
2928                                  format_timespan(userspace, sizeof(userspace), userspace_usec),
2929                                  format_timespan(sum, sizeof(sum), total_usec));
2930                 } else {
2931                         kernel_usec = m->startup_timestamp.monotonic;
2932                         initrd_usec = 0;
2933
2934                         log_info("Startup finished in %s (kernel) + %s (userspace) = %s.",
2935                                  format_timespan(kernel, sizeof(kernel), kernel_usec),
2936                                  format_timespan(userspace, sizeof(userspace), userspace_usec),
2937                                  format_timespan(sum, sizeof(sum), total_usec));
2938                 }
2939         } else {
2940                 userspace_usec = initrd_usec = kernel_usec = 0;
2941                 total_usec = m->finish_timestamp.monotonic - m->startup_timestamp.monotonic;
2942
2943                 log_debug("Startup finished in %s.",
2944                           format_timespan(sum, sizeof(sum), total_usec));
2945         }
2946
2947         bus_broadcast_finished(m, kernel_usec, initrd_usec, userspace_usec, total_usec);
2948
2949         sd_notifyf(false,
2950                    "READY=1\nSTATUS=Startup finished in %s.",
2951                    format_timespan(sum, sizeof(sum), total_usec));
2952 }
2953
2954 void manager_run_generators(Manager *m) {
2955         DIR *d = NULL;
2956         const char *generator_path;
2957         const char *argv[3];
2958
2959         assert(m);
2960
2961         generator_path = m->running_as == MANAGER_SYSTEM ? SYSTEM_GENERATOR_PATH : USER_GENERATOR_PATH;
2962         if (!(d = opendir(generator_path))) {
2963
2964                 if (errno == ENOENT)
2965                         return;
2966
2967                 log_error("Failed to enumerate generator directory: %m");
2968                 return;
2969         }
2970
2971         if (!m->generator_unit_path) {
2972                 const char *p;
2973                 char user_path[] = "/tmp/systemd-generator-XXXXXX";
2974
2975                 if (m->running_as == MANAGER_SYSTEM && getpid() == 1) {
2976                         p = "/run/systemd/generator";
2977
2978                         if (mkdir_p(p, 0755) < 0) {
2979                                 log_error("Failed to create generator directory: %m");
2980                                 goto finish;
2981                         }
2982
2983                 } else {
2984                         if (!(p = mkdtemp(user_path))) {
2985                                 log_error("Failed to create generator directory: %m");
2986                                 goto finish;
2987                         }
2988                 }
2989
2990                 if (!(m->generator_unit_path = strdup(p))) {
2991                         log_error("Failed to allocate generator unit path.");
2992                         goto finish;
2993                 }
2994         }
2995
2996         argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */
2997         argv[1] = m->generator_unit_path;
2998         argv[2] = NULL;
2999
3000         execute_directory(generator_path, d, (char**) argv);
3001
3002         if (rmdir(m->generator_unit_path) >= 0) {
3003                 /* Uh? we were able to remove this dir? I guess that
3004                  * means the directory was empty, hence let's shortcut
3005                  * this */
3006
3007                 free(m->generator_unit_path);
3008                 m->generator_unit_path = NULL;
3009                 goto finish;
3010         }
3011
3012         if (!strv_find(m->lookup_paths.unit_path, m->generator_unit_path)) {
3013                 char **l;
3014
3015                 if (!(l = strv_append(m->lookup_paths.unit_path, m->generator_unit_path))) {
3016                         log_error("Failed to add generator directory to unit search path: %m");
3017                         goto finish;
3018                 }
3019
3020                 strv_free(m->lookup_paths.unit_path);
3021                 m->lookup_paths.unit_path = l;
3022
3023                 log_debug("Added generator unit path %s to search path.", m->generator_unit_path);
3024         }
3025
3026 finish:
3027         if (d)
3028                 closedir(d);
3029 }
3030
3031 void manager_undo_generators(Manager *m) {
3032         assert(m);
3033
3034         if (!m->generator_unit_path)
3035                 return;
3036
3037         strv_remove(m->lookup_paths.unit_path, m->generator_unit_path);
3038         rm_rf(m->generator_unit_path, false, true);
3039
3040         free(m->generator_unit_path);
3041         m->generator_unit_path = NULL;
3042 }
3043
3044 int manager_set_default_controllers(Manager *m, char **controllers) {
3045         char **l;
3046
3047         assert(m);
3048
3049         if (!(l = strv_copy(controllers)))
3050                 return -ENOMEM;
3051
3052         strv_free(m->default_controllers);
3053         m->default_controllers = l;
3054
3055         return 0;
3056 }
3057
3058 void manager_recheck_syslog(Manager *m) {
3059         Unit *u;
3060
3061         assert(m);
3062
3063         if (m->running_as != MANAGER_SYSTEM)
3064                 return;
3065
3066         if ((u = manager_get_unit(m, SPECIAL_SYSLOG_SOCKET))) {
3067                 SocketState state;
3068
3069                 state = SOCKET(u)->state;
3070
3071                 if (state != SOCKET_DEAD &&
3072                     state != SOCKET_FAILED &&
3073                     state != SOCKET_RUNNING) {
3074
3075                         /* Hmm, the socket is not set up, or is still
3076                          * listening, let's better not try to use
3077                          * it. Note that we have no problem if the
3078                          * socket is completely down, since there
3079                          * might be a foreign /dev/log socket around
3080                          * and we want to make use of that.
3081                          */
3082
3083                         log_close_syslog();
3084                         return;
3085                 }
3086         }
3087
3088         if ((u = manager_get_unit(m, SPECIAL_SYSLOG_TARGET)))
3089                 if (TARGET(u)->state != TARGET_ACTIVE) {
3090                         log_close_syslog();
3091                         return;
3092                 }
3093
3094         /* Hmm, OK, so the socket is either fully up, or fully down,
3095          * and the target is up, then let's make use of the socket */
3096         log_open();
3097 }
3098
3099 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
3100         [MANAGER_SYSTEM] = "system",
3101         [MANAGER_USER] = "user"
3102 };
3103
3104 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);