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|O_CLOEXEC)) < 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_reloading ++;
 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_reloading > 0);
 614                 m->n_reloading --;
 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                 if (j->unit->meta.job && !j->installed)
 901                         transaction_merge_and_delete_job(m, j, j->unit->meta.job, t);
 902
 903                 assert(!j->transaction_next);
 904                 assert(!j->transaction_prev);
 905         }
 906
 907         return 0;
 908 }
 909
 910 static void transaction_drop_redundant(Manager *m) {
 911         bool again;
 912
 913         assert(m);
 914
 915         /* Goes through the transaction and removes all jobs that are
 916          * a noop */
 917
 918         do {
 919                 Job *j;
 920                 Iterator i;
 921
 922                 again = false;
 923
 924                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 925                         bool changes_something = false;
 926                         Job *k;
 927
 928                         LIST_FOREACH(transaction, k, j) {
 929
 930                                 if (!job_is_anchor(k) &&
 931                                     (k->installed || job_type_is_redundant(k->type, unit_active_state(k->unit))) &&
 932                                     (!k->unit->meta.job || !job_type_is_conflicting(k->type, k->unit->meta.job->type)))
 933                                         continue;
 934
 935                                 changes_something = true;
 936                                 break;
 937                         }
 938
 939                         if (changes_something)
 940                                 continue;
 941
 942                         /* log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type)); */
 943                         transaction_delete_job(m, j, false);
 944                         again = true;
 945                         break;
 946                 }
 947
 948         } while (again);
 949 }
 950
 951 static bool unit_matters_to_anchor(Unit *u, Job *j) {
 952         assert(u);
 953         assert(!j->transaction_prev);
 954
 955         /* Checks whether at least one of the jobs for this unit
 956          * matters to the anchor. */
 957
 958         LIST_FOREACH(transaction, j, j)
 959                 if (j->matters_to_anchor)
 960                         return true;
 961
 962         return false;
 963 }
 964
 965 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation, DBusError *e) {
 966         Iterator i;
 967         Unit *u;
 968         int r;
 969
 970         assert(m);
 971         assert(j);
 972         assert(!j->transaction_prev);
 973
 974         /* Does a recursive sweep through the ordering graph, looking
 975          * for a cycle. If we find cycle we try to break it. */
 976
 977         /* Have we seen this before? */
 978         if (j->generation == generation) {
 979                 Job *k, *delete;
 980
 981                 /* If the marker is NULL we have been here already and
 982                  * decided the job was loop-free from here. Hence
 983                  * shortcut things and return right-away. */
 984                 if (!j->marker)
 985                         return 0;
 986
 987                 /* So, the marker is not NULL and we already have been
 988                  * here. We have a cycle. Let's try to break it. We go
 989                  * backwards in our path and try to find a suitable
 990                  * job to remove. We use the marker to find our way
 991                  * back, since smart how we are we stored our way back
 992                  * in there. */
 993                 log_warning("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
 994
 995                 delete = NULL;
 996                 for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
 997
 998                         log_info("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
 999
1000                         if (!delete &&
1001                             !k->installed &&
1002                             !unit_matters_to_anchor(k->unit, k)) {
1003                                 /* Ok, we can drop this one, so let's
1004                                  * do so. */
1005                                 delete = k;
1006                         }
1007
1008                         /* Check if this in fact was the beginning of
1009                          * the cycle */
1010                         if (k == j)
1011                                 break;
1012                 }
1013
1014
1015                 if (delete) {
1016                         log_warning("Breaking ordering cycle by deleting job %s/%s", delete->unit->meta.id, job_type_to_string(delete->type));
1017                         transaction_delete_unit(m, delete->unit);
1018                         return -EAGAIN;
1019                 }
1020
1021                 log_error("Unable to break cycle");
1022
1023                 dbus_set_error(e, BUS_ERROR_TRANSACTION_ORDER_IS_CYCLIC, "Transaction order is cyclic. See system logs for details.");
1024                 return -ENOEXEC;
1025         }
1026
1027         /* Make the marker point to where we come from, so that we can
1028          * find our way backwards if we want to break a cycle. We use
1029          * a special marker for the beginning: we point to
1030          * ourselves. */
1031         j->marker = from ? from : j;
1032         j->generation = generation;
1033
1034         /* We assume that the the dependencies are bidirectional, and
1035          * hence can ignore UNIT_AFTER */
1036         SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
1037                 Job *o;
1038
1039                 /* Is there a job for this unit? */
1040                 if (!(o = hashmap_get(m->transaction_jobs, u)))
1041
1042                         /* Ok, there is no job for this in the
1043                          * transaction, but maybe there is already one
1044                          * running? */
1045                         if (!(o = u->meta.job))
1046                                 continue;
1047
1048                 if ((r = transaction_verify_order_one(m, o, j, generation, e)) < 0)
1049                         return r;
1050         }
1051
1052         /* Ok, let's backtrack, and remember that this entry is not on
1053          * our path anymore. */
1054         j->marker = NULL;
1055
1056         return 0;
1057 }
1058
1059 static int transaction_verify_order(Manager *m, unsigned *generation, DBusError *e) {
1060         Job *j;
1061         int r;
1062         Iterator i;
1063         unsigned g;
1064
1065         assert(m);
1066         assert(generation);
1067
1068         /* Check if the ordering graph is cyclic. If it is, try to fix
1069          * that up by dropping one of the jobs. */
1070
1071         g = (*generation)++;
1072
1073         HASHMAP_FOREACH(j, m->transaction_jobs, i)
1074                 if ((r = transaction_verify_order_one(m, j, NULL, g, e)) < 0)
1075                         return r;
1076
1077         return 0;
1078 }
1079
1080 static void transaction_collect_garbage(Manager *m) {
1081         bool again;
1082
1083         assert(m);
1084
1085         /* Drop jobs that are not required by any other job */
1086
1087         do {
1088                 Iterator i;
1089                 Job *j;
1090
1091                 again = false;
1092
1093                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1094                         if (j->object_list) {
1095                                 /* log_debug("Keeping job %s/%s because of %s/%s", */
1096                                 /*           j->unit->meta.id, job_type_to_string(j->type), */
1097                                 /*           j->object_list->subject ? j->object_list->subject->unit->meta.id : "root", */
1098                                 /*           j->object_list->subject ? job_type_to_string(j->object_list->subject->type) : "root"); */
1099                                 continue;
1100                         }
1101
1102                         /* log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type)); */
1103                         transaction_delete_job(m, j, true);
1104                         again = true;
1105                         break;
1106                 }
1107
1108         } while (again);
1109 }
1110
1111 static int transaction_is_destructive(Manager *m, DBusError *e) {
1112         Iterator i;
1113         Job *j;
1114
1115         assert(m);
1116
1117         /* Checks whether applying this transaction means that
1118          * existing jobs would be replaced */
1119
1120         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1121
1122                 /* Assume merged */
1123                 assert(!j->transaction_prev);
1124                 assert(!j->transaction_next);
1125
1126                 if (j->unit->meta.job &&
1127                     j->unit->meta.job != j &&
1128                     !job_type_is_superset(j->type, j->unit->meta.job->type)) {
1129
1130                         dbus_set_error(e, BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE, "Transaction is destructive.");
1131                         return -EEXIST;
1132                 }
1133         }
1134
1135         return 0;
1136 }
1137
1138 static void transaction_minimize_impact(Manager *m) {
1139         bool again;
1140         assert(m);
1141
1142         /* Drops all unnecessary jobs that reverse already active jobs
1143          * or that stop a running service. */
1144
1145         do {
1146                 Job *j;
1147                 Iterator i;
1148
1149                 again = false;
1150
1151                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1152                         LIST_FOREACH(transaction, j, j) {
1153                                 bool stops_running_service, changes_existing_job;
1154
1155                                 /* If it matters, we shouldn't drop it */
1156                                 if (j->matters_to_anchor)
1157                                         continue;
1158
1159                                 /* Would this stop a running service?
1160                                  * Would this change an existing job?
1161                                  * If so, let's drop this entry */
1162
1163                                 stops_running_service =
1164                                         j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1165
1166                                 changes_existing_job =
1167                                         j->unit->meta.job &&
1168                                         job_type_is_conflicting(j->type, j->unit->meta.job->type);
1169
1170                                 if (!stops_running_service && !changes_existing_job)
1171                                         continue;
1172
1173                                 if (stops_running_service)
1174                                         log_debug("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1175
1176                                 if (changes_existing_job)
1177                                         log_debug("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1178
1179                                 /* Ok, let's get rid of this */
1180                                 log_debug("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1181
1182                                 transaction_delete_job(m, j, true);
1183                                 again = true;
1184                                 break;
1185                         }
1186
1187                         if (again)
1188                                 break;
1189                 }
1190
1191         } while (again);
1192 }
1193
1194 static int transaction_apply(Manager *m, JobMode mode) {
1195         Iterator i;
1196         Job *j;
1197         int r;
1198
1199         /* Moves the transaction jobs to the set of active jobs */
1200
1201         if (mode == JOB_ISOLATE) {
1202
1203                 /* When isolating first kill all installed jobs which
1204                  * aren't part of the new transaction */
1205                 HASHMAP_FOREACH(j, m->jobs, i) {
1206                         assert(j->installed);
1207
1208                         if (hashmap_get(m->transaction_jobs, j->unit))
1209                                 continue;
1210
1211                         job_finish_and_invalidate(j, JOB_CANCELED);
1212                 }
1213         }
1214
1215         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1216                 /* Assume merged */
1217                 assert(!j->transaction_prev);
1218                 assert(!j->transaction_next);
1219
1220                 if (j->installed)
1221                         continue;
1222
1223                 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1224                         goto rollback;
1225         }
1226
1227         while ((j = hashmap_steal_first(m->transaction_jobs))) {
1228                 if (j->installed) {
1229                         /* log_debug("Skipping already installed job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id); */
1230                         continue;
1231                 }
1232
1233                 if (j->unit->meta.job)
1234                         job_free(j->unit->meta.job);
1235
1236                 j->unit->meta.job = j;
1237                 j->installed = true;
1238                 m->n_installed_jobs ++;
1239
1240                 /* We're fully installed. Now let's free data we don't
1241                  * need anymore. */
1242
1243                 assert(!j->transaction_next);
1244                 assert(!j->transaction_prev);
1245
1246                 job_add_to_run_queue(j);
1247                 job_add_to_dbus_queue(j);
1248                 job_start_timer(j);
1249
1250                 log_debug("Installed new job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id);
1251         }
1252
1253         /* As last step, kill all remaining job dependencies. */
1254         transaction_clean_dependencies(m);
1255
1256         return 0;
1257
1258 rollback:
1259
1260         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1261                 if (j->installed)
1262                         continue;
1263
1264                 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1265         }
1266
1267         return r;
1268 }
1269
1270 static int transaction_activate(Manager *m, JobMode mode, DBusError *e) {
1271         int r;
1272         unsigned generation = 1;
1273
1274         assert(m);
1275
1276         /* This applies the changes recorded in transaction_jobs to
1277          * the actual list of jobs, if possible. */
1278
1279         /* First step: figure out which jobs matter */
1280         transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1281
1282         /* Second step: Try not to stop any running services if
1283          * we don't have to. Don't try to reverse running
1284          * jobs if we don't have to. */
1285         if (mode == JOB_FAIL)
1286                 transaction_minimize_impact(m);
1287
1288         /* Third step: Drop redundant jobs */
1289         transaction_drop_redundant(m);
1290
1291         for (;;) {
1292                 /* Fourth step: Let's remove unneeded jobs that might
1293                  * be lurking. */
1294                 if (mode != JOB_ISOLATE)
1295                         transaction_collect_garbage(m);
1296
1297                 /* Fifth step: verify order makes sense and correct
1298                  * cycles if necessary and possible */
1299                 if ((r = transaction_verify_order(m, &generation, e)) >= 0)
1300                         break;
1301
1302                 if (r != -EAGAIN) {
1303                         log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r));
1304                         goto rollback;
1305                 }
1306
1307                 /* Let's see if the resulting transaction ordering
1308                  * graph is still cyclic... */
1309         }
1310
1311         for (;;) {
1312                 /* Sixth step: let's drop unmergeable entries if
1313                  * necessary and possible, merge entries we can
1314                  * merge */
1315                 if ((r = transaction_merge_jobs(m, e)) >= 0)
1316                         break;
1317
1318                 if (r != -EAGAIN) {
1319                         log_warning("Requested transaction contains unmergeable jobs: %s", bus_error(e, r));
1320                         goto rollback;
1321                 }
1322
1323                 /* Seventh step: an entry got dropped, let's garbage
1324                  * collect its dependencies. */
1325                 if (mode != JOB_ISOLATE)
1326                         transaction_collect_garbage(m);
1327
1328                 /* Let's see if the resulting transaction still has
1329                  * unmergeable entries ... */
1330         }
1331
1332         /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1333         transaction_drop_redundant(m);
1334
1335         /* Ninth step: check whether we can actually apply this */
1336         if (mode == JOB_FAIL)
1337                 if ((r = transaction_is_destructive(m, e)) < 0) {
1338                         log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r));
1339                         goto rollback;
1340                 }
1341
1342         /* Tenth step: apply changes */
1343         if ((r = transaction_apply(m, mode)) < 0) {
1344                 log_warning("Failed to apply transaction: %s", strerror(-r));
1345                 goto rollback;
1346         }
1347
1348         assert(hashmap_isempty(m->transaction_jobs));
1349         assert(!m->transaction_anchor);
1350
1351         return 0;
1352
1353 rollback:
1354         transaction_abort(m);
1355         return r;
1356 }
1357
1358 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1359         Job *j, *f;
1360
1361         assert(m);
1362         assert(unit);
1363
1364         /* Looks for an existing prospective job and returns that. If
1365          * it doesn't exist it is created and added to the prospective
1366          * jobs list. */
1367
1368         f = hashmap_get(m->transaction_jobs, unit);
1369
1370         LIST_FOREACH(transaction, j, f) {
1371                 assert(j->unit == unit);
1372
1373                 if (j->type == type) {
1374                         if (is_new)
1375                                 *is_new = false;
1376                         return j;
1377                 }
1378         }
1379
1380         if (unit->meta.job && unit->meta.job->type == type)
1381                 j = unit->meta.job;
1382         else if (!(j = job_new(m, type, unit)))
1383                 return NULL;
1384
1385         j->generation = 0;
1386         j->marker = NULL;
1387         j->matters_to_anchor = false;
1388         j->override = override;
1389
1390         LIST_PREPEND(Job, transaction, f, j);
1391
1392         if (hashmap_replace(m->transaction_jobs, unit, f) < 0) {
1393                 job_free(j);
1394                 return NULL;
1395         }
1396
1397         if (is_new)
1398                 *is_new = true;
1399
1400         /* log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type)); */
1401
1402         return j;
1403 }
1404
1405 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1406         assert(m);
1407         assert(j);
1408
1409         if (j->transaction_prev)
1410                 j->transaction_prev->transaction_next = j->transaction_next;
1411         else if (j->transaction_next)
1412                 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1413         else
1414                 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1415
1416         if (j->transaction_next)
1417                 j->transaction_next->transaction_prev = j->transaction_prev;
1418
1419         j->transaction_prev = j->transaction_next = NULL;
1420
1421         while (j->subject_list)
1422                 job_dependency_free(j->subject_list);
1423
1424         while (j->object_list) {
1425                 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1426
1427                 job_dependency_free(j->object_list);
1428
1429                 if (other && delete_dependencies) {
1430                         log_debug("Deleting job %s/%s as dependency of job %s/%s",
1431                                   other->unit->meta.id, job_type_to_string(other->type),
1432                                   j->unit->meta.id, job_type_to_string(j->type));
1433                         transaction_delete_job(m, other, delete_dependencies);
1434                 }
1435         }
1436 }
1437
1438 static int transaction_add_job_and_dependencies(
1439                 Manager *m,
1440                 JobType type,
1441                 Unit *unit,
1442                 Job *by,
1443                 bool matters,
1444                 bool override,
1445                 bool conflicts,
1446                 bool ignore_requirements,
1447                 bool ignore_order,
1448                 DBusError *e,
1449                 Job **_ret) {
1450         Job *ret;
1451         Iterator i;
1452         Unit *dep;
1453         int r;
1454         bool is_new;
1455
1456         assert(m);
1457         assert(type < _JOB_TYPE_MAX);
1458         assert(unit);
1459
1460         /* log_debug("Pulling in %s/%s from %s/%s", */
1461         /*           unit->meta.id, job_type_to_string(type), */
1462         /*           by ? by->unit->meta.id : "NA", */
1463         /*           by ? job_type_to_string(by->type) : "NA"); */
1464
1465         if (unit->meta.load_state != UNIT_LOADED &&
1466             unit->meta.load_state != UNIT_ERROR &&
1467             unit->meta.load_state != UNIT_MASKED) {
1468                 dbus_set_error(e, BUS_ERROR_LOAD_FAILED, "Unit %s is not loaded properly.", unit->meta.id);
1469                 return -EINVAL;
1470         }
1471
1472         if (type != JOB_STOP && unit->meta.load_state == UNIT_ERROR) {
1473                 dbus_set_error(e, BUS_ERROR_LOAD_FAILED,
1474                                "Unit %s failed to load: %s. "
1475                                "See system logs and 'systemctl status %s' for details.",
1476                                unit->meta.id,
1477                                strerror(-unit->meta.load_error),
1478                                unit->meta.id);
1479                 return -EINVAL;
1480         }
1481
1482         if (type != JOB_STOP && unit->meta.load_state == UNIT_MASKED) {
1483                 dbus_set_error(e, BUS_ERROR_MASKED, "Unit %s is masked.", unit->meta.id);
1484                 return -EINVAL;
1485         }
1486
1487         if (!unit_job_is_applicable(unit, type)) {
1488                 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);
1489                 return -EBADR;
1490         }
1491
1492         /* First add the job. */
1493         if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1494                 return -ENOMEM;
1495
1496         ret->ignore_order = ret->ignore_order || ignore_order;
1497
1498         /* Then, add a link to the job. */
1499         if (!job_dependency_new(by, ret, matters, conflicts))
1500                 return -ENOMEM;
1501
1502         if (is_new && !ignore_requirements) {
1503                 Set *following;
1504
1505                 /* If we are following some other unit, make sure we
1506                  * add all dependencies of everybody following. */
1507                 if (unit_following_set(ret->unit, &following) > 0) {
1508                         SET_FOREACH(dep, following, i)
1509                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
1510                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1511
1512                                         if (e)
1513                                                 dbus_error_free(e);
1514                                 }
1515
1516                         set_free(following);
1517                 }
1518
1519                 /* Finally, recursively add in all dependencies. */
1520                 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1521                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1522                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1523                                         if (r != -EBADR)
1524                                                 goto fail;
1525
1526                                         if (e)
1527                                                 dbus_error_free(e);
1528                                 }
1529
1530                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BIND_TO], i)
1531                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1532
1533                                         if (r != -EBADR)
1534                                                 goto fail;
1535
1536                                         if (e)
1537                                                 dbus_error_free(e);
1538                                 }
1539
1540                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1541                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
1542                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1543
1544                                         if (e)
1545                                                 dbus_error_free(e);
1546                                 }
1547
1548                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1549                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, false, false, ignore_order, e, NULL)) < 0) {
1550                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1551
1552                                         if (e)
1553                                                 dbus_error_free(e);
1554                                 }
1555
1556                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1557                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1558
1559                                         if (r != -EBADR)
1560                                                 goto fail;
1561
1562                                         if (e)
1563                                                 dbus_error_free(e);
1564                                 }
1565
1566                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1567                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
1568                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1569
1570                                         if (e)
1571                                                 dbus_error_free(e);
1572                                 }
1573
1574                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1575                                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, true, false, ignore_order, e, NULL)) < 0) {
1576
1577                                         if (r != -EBADR)
1578                                                 goto fail;
1579
1580                                         if (e)
1581                                                 dbus_error_free(e);
1582                                 }
1583
1584                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTED_BY], i)
1585                                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
1586                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1587
1588                                         if (e)
1589                                                 dbus_error_free(e);
1590                                 }
1591
1592                 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1593
1594                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1595                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1596
1597                                         if (r != -EBADR)
1598                                                 goto fail;
1599
1600                                         if (e)
1601                                                 dbus_error_free(e);
1602                                 }
1603
1604                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BOUND_BY], i)
1605                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1606
1607                                         if (r != -EBADR)
1608                                                 goto fail;
1609
1610                                         if (e)
1611                                                 dbus_error_free(e);
1612                                 }
1613                 }
1614
1615                 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1616         }
1617
1618         if (_ret)
1619                 *_ret = ret;
1620
1621         return 0;
1622
1623 fail:
1624         return r;
1625 }
1626
1627 static int transaction_add_isolate_jobs(Manager *m) {
1628         Iterator i;
1629         Unit *u;
1630         char *k;
1631         int r;
1632
1633         assert(m);
1634
1635         HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1636
1637                 /* ignore aliases */
1638                 if (u->meta.id != k)
1639                         continue;
1640
1641                 if (u->meta.ignore_on_isolate)
1642                         continue;
1643
1644                 /* No need to stop inactive jobs */
1645                 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)) && !u->meta.job)
1646                         continue;
1647
1648                 /* Is there already something listed for this? */
1649                 if (hashmap_get(m->transaction_jobs, u))
1650                         continue;
1651
1652                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, false, false, false, NULL, NULL)) < 0)
1653                         log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1654         }
1655
1656         return 0;
1657 }
1658
1659 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, DBusError *e, Job **_ret) {
1660         int r;
1661         Job *ret;
1662
1663         assert(m);
1664         assert(type < _JOB_TYPE_MAX);
1665         assert(unit);
1666         assert(mode < _JOB_MODE_MAX);
1667
1668         if (mode == JOB_ISOLATE && type != JOB_START) {
1669                 dbus_set_error(e, BUS_ERROR_INVALID_JOB_MODE, "Isolate is only valid for start.");
1670                 return -EINVAL;
1671         }
1672
1673         if (mode == JOB_ISOLATE && !unit->meta.allow_isolate) {
1674                 dbus_set_error(e, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
1675                 return -EPERM;
1676         }
1677
1678         log_debug("Trying to enqueue job %s/%s/%s", unit->meta.id, job_type_to_string(type), job_mode_to_string(mode));
1679
1680         if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, false,
1681                                                       mode == JOB_IGNORE_DEPENDENCIES || mode == JOB_IGNORE_REQUIREMENTS,
1682                                                       mode == JOB_IGNORE_DEPENDENCIES, e, &ret)) < 0) {
1683                 transaction_abort(m);
1684                 return r;
1685         }
1686
1687         if (mode == JOB_ISOLATE)
1688                 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1689                         transaction_abort(m);
1690                         return r;
1691                 }
1692
1693         if ((r = transaction_activate(m, mode, e)) < 0)
1694                 return r;
1695
1696         log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1697
1698         if (_ret)
1699                 *_ret = ret;
1700
1701         return 0;
1702 }
1703
1704 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, DBusError *e, Job **_ret) {
1705         Unit *unit;
1706         int r;
1707
1708         assert(m);
1709         assert(type < _JOB_TYPE_MAX);
1710         assert(name);
1711         assert(mode < _JOB_MODE_MAX);
1712
1713         if ((r = manager_load_unit(m, name, NULL, NULL, &unit)) < 0)
1714                 return r;
1715
1716         return manager_add_job(m, type, unit, mode, override, e, _ret);
1717 }
1718
1719 Job *manager_get_job(Manager *m, uint32_t id) {
1720         assert(m);
1721
1722         return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1723 }
1724
1725 Unit *manager_get_unit(Manager *m, const char *name) {
1726         assert(m);
1727         assert(name);
1728
1729         return hashmap_get(m->units, name);
1730 }
1731
1732 unsigned manager_dispatch_load_queue(Manager *m) {
1733         Meta *meta;
1734         unsigned n = 0;
1735
1736         assert(m);
1737
1738         /* Make sure we are not run recursively */
1739         if (m->dispatching_load_queue)
1740                 return 0;
1741
1742         m->dispatching_load_queue = true;
1743
1744         /* Dispatches the load queue. Takes a unit from the queue and
1745          * tries to load its data until the queue is empty */
1746
1747         while ((meta = m->load_queue)) {
1748                 assert(meta->in_load_queue);
1749
1750                 unit_load((Unit*) meta);
1751                 n++;
1752         }
1753
1754         m->dispatching_load_queue = false;
1755         return n;
1756 }
1757
1758 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1759         Unit *ret;
1760         int r;
1761
1762         assert(m);
1763         assert(name || path);
1764
1765         /* This will prepare the unit for loading, but not actually
1766          * load anything from disk. */
1767
1768         if (path && !is_path(path)) {
1769                 dbus_set_error(e, BUS_ERROR_INVALID_PATH, "Path %s is not absolute.", path);
1770                 return -EINVAL;
1771         }
1772
1773         if (!name)
1774                 name = file_name_from_path(path);
1775
1776         if (!unit_name_is_valid(name, false)) {
1777                 dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
1778                 return -EINVAL;
1779         }
1780
1781         if ((ret = manager_get_unit(m, name))) {
1782                 *_ret = ret;
1783                 return 1;
1784         }
1785
1786         if (!(ret = unit_new(m)))
1787                 return -ENOMEM;
1788
1789         if (path)
1790                 if (!(ret->meta.fragment_path = strdup(path))) {
1791                         unit_free(ret);
1792                         return -ENOMEM;
1793                 }
1794
1795         if ((r = unit_add_name(ret, name)) < 0) {
1796                 unit_free(ret);
1797                 return r;
1798         }
1799
1800         unit_add_to_load_queue(ret);
1801         unit_add_to_dbus_queue(ret);
1802         unit_add_to_gc_queue(ret);
1803
1804         if (_ret)
1805                 *_ret = ret;
1806
1807         return 0;
1808 }
1809
1810 int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1811         int r;
1812
1813         assert(m);
1814
1815         /* This will load the service information files, but not actually
1816          * start any services or anything. */
1817
1818         if ((r = manager_load_unit_prepare(m, name, path, e, _ret)) != 0)
1819                 return r;
1820
1821         manager_dispatch_load_queue(m);
1822
1823         if (_ret)
1824                 *_ret = unit_follow_merge(*_ret);
1825
1826         return 0;
1827 }
1828
1829 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1830         Iterator i;
1831         Job *j;
1832
1833         assert(s);
1834         assert(f);
1835
1836         HASHMAP_FOREACH(j, s->jobs, i)
1837                 job_dump(j, f, prefix);
1838 }
1839
1840 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1841         Iterator i;
1842         Unit *u;
1843         const char *t;
1844
1845         assert(s);
1846         assert(f);
1847
1848         HASHMAP_FOREACH_KEY(u, t, s->units, i)
1849                 if (u->meta.id == t)
1850                         unit_dump(u, f, prefix);
1851 }
1852
1853 void manager_clear_jobs(Manager *m) {
1854         Job *j;
1855
1856         assert(m);
1857
1858         transaction_abort(m);
1859
1860         while ((j = hashmap_first(m->jobs)))
1861                 job_finish_and_invalidate(j, JOB_CANCELED);
1862 }
1863
1864 unsigned manager_dispatch_run_queue(Manager *m) {
1865         Job *j;
1866         unsigned n = 0;
1867
1868         if (m->dispatching_run_queue)
1869                 return 0;
1870
1871         m->dispatching_run_queue = true;
1872
1873         while ((j = m->run_queue)) {
1874                 assert(j->installed);
1875                 assert(j->in_run_queue);
1876
1877                 job_run_and_invalidate(j);
1878                 n++;
1879         }
1880
1881         m->dispatching_run_queue = false;
1882         return n;
1883 }
1884
1885 unsigned manager_dispatch_dbus_queue(Manager *m) {
1886         Job *j;
1887         Meta *meta;
1888         unsigned n = 0;
1889
1890         assert(m);
1891
1892         if (m->dispatching_dbus_queue)
1893                 return 0;
1894
1895         m->dispatching_dbus_queue = true;
1896
1897         while ((meta = m->dbus_unit_queue)) {
1898                 assert(meta->in_dbus_queue);
1899
1900                 bus_unit_send_change_signal((Unit*) meta);
1901                 n++;
1902         }
1903
1904         while ((j = m->dbus_job_queue)) {
1905                 assert(j->in_dbus_queue);
1906
1907                 bus_job_send_change_signal(j);
1908                 n++;
1909         }
1910
1911         m->dispatching_dbus_queue = false;
1912         return n;
1913 }
1914
1915 static int manager_process_notify_fd(Manager *m) {
1916         ssize_t n;
1917
1918         assert(m);
1919
1920         for (;;) {
1921                 char buf[4096];
1922                 struct msghdr msghdr;
1923                 struct iovec iovec;
1924                 struct ucred *ucred;
1925                 union {
1926                         struct cmsghdr cmsghdr;
1927                         uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1928                 } control;
1929                 Unit *u;
1930                 char **tags;
1931
1932                 zero(iovec);
1933                 iovec.iov_base = buf;
1934                 iovec.iov_len = sizeof(buf)-1;
1935
1936                 zero(control);
1937                 zero(msghdr);
1938                 msghdr.msg_iov = &iovec;
1939                 msghdr.msg_iovlen = 1;
1940                 msghdr.msg_control = &control;
1941                 msghdr.msg_controllen = sizeof(control);
1942
1943                 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1944                         if (n >= 0)
1945                                 return -EIO;
1946
1947                         if (errno == EAGAIN || errno == EINTR)
1948                                 break;
1949
1950                         return -errno;
1951                 }
1952
1953                 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1954                     control.cmsghdr.cmsg_level != SOL_SOCKET ||
1955                     control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1956                     control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1957                         log_warning("Received notify message without credentials. Ignoring.");
1958                         continue;
1959                 }
1960
1961                 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1962
1963                 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(ucred->pid))))
1964                         if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1965                                 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1966                                 continue;
1967                         }
1968
1969                 assert((size_t) n < sizeof(buf));
1970                 buf[n] = 0;
1971                 if (!(tags = strv_split(buf, "\n\r")))
1972                         return -ENOMEM;
1973
1974                 log_debug("Got notification message for unit %s", u->meta.id);
1975
1976                 if (UNIT_VTABLE(u)->notify_message)
1977                         UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
1978
1979                 strv_free(tags);
1980         }
1981
1982         return 0;
1983 }
1984
1985 static int manager_dispatch_sigchld(Manager *m) {
1986         assert(m);
1987
1988         for (;;) {
1989                 siginfo_t si;
1990                 Unit *u;
1991                 int r;
1992
1993                 zero(si);
1994
1995                 /* First we call waitd() for a PID and do not reap the
1996                  * zombie. That way we can still access /proc/$PID for
1997                  * it while it is a zombie. */
1998                 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1999
2000                         if (errno == ECHILD)
2001                                 break;
2002
2003                         if (errno == EINTR)
2004                                 continue;
2005
2006                         return -errno;
2007                 }
2008
2009                 if (si.si_pid <= 0)
2010                         break;
2011
2012                 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
2013                         char *name = NULL;
2014
2015                         get_process_name(si.si_pid, &name);
2016                         log_debug("Got SIGCHLD for process %lu (%s)", (unsigned long) si.si_pid, strna(name));
2017                         free(name);
2018                 }
2019
2020                 /* Let's flush any message the dying child might still
2021                  * have queued for us. This ensures that the process
2022                  * still exists in /proc so that we can figure out
2023                  * which cgroup and hence unit it belongs to. */
2024                 if ((r = manager_process_notify_fd(m)) < 0)
2025                         return r;
2026
2027                 /* And now figure out the unit this belongs to */
2028                 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(si.si_pid))))
2029                         u = cgroup_unit_by_pid(m, si.si_pid);
2030
2031                 /* And now, we actually reap the zombie. */
2032                 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
2033                         if (errno == EINTR)
2034                                 continue;
2035
2036                         return -errno;
2037                 }
2038
2039                 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
2040                         continue;
2041
2042                 log_debug("Child %lu died (code=%s, status=%i/%s)",
2043                           (long unsigned) si.si_pid,
2044                           sigchld_code_to_string(si.si_code),
2045                           si.si_status,
2046                           strna(si.si_code == CLD_EXITED
2047                                 ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
2048                                 : signal_to_string(si.si_status)));
2049
2050                 if (!u)
2051                         continue;
2052
2053                 log_debug("Child %lu belongs to %s", (long unsigned) si.si_pid, u->meta.id);
2054
2055                 hashmap_remove(m->watch_pids, LONG_TO_PTR(si.si_pid));
2056                 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
2057         }
2058
2059         return 0;
2060 }
2061
2062 static int manager_start_target(Manager *m, const char *name, JobMode mode) {
2063         int r;
2064         DBusError error;
2065
2066         dbus_error_init(&error);
2067
2068         log_debug("Activating special unit %s", name);
2069
2070         if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL)) < 0)
2071                 log_error("Failed to enqueue %s job: %s", name, bus_error(&error, r));
2072
2073         dbus_error_free(&error);
2074
2075         return r;
2076 }
2077
2078 static int manager_process_signal_fd(Manager *m) {
2079         ssize_t n;
2080         struct signalfd_siginfo sfsi;
2081         bool sigchld = false;
2082
2083         assert(m);
2084
2085         for (;;) {
2086                 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
2087
2088                         if (n >= 0)
2089                                 return -EIO;
2090
2091                         if (errno == EINTR || errno == EAGAIN)
2092                                 break;
2093
2094                         return -errno;
2095                 }
2096
2097                 if (sfsi.ssi_pid > 0) {
2098                         char *p = NULL;
2099
2100                         get_process_name(sfsi.ssi_pid, &p);
2101
2102                         log_debug("Received SIG%s from PID %lu (%s).",
2103                                   strna(signal_to_string(sfsi.ssi_signo)),
2104                                   (unsigned long) sfsi.ssi_pid, strna(p));
2105                         free(p);
2106                 } else
2107                         log_debug("Received SIG%s.", strna(signal_to_string(sfsi.ssi_signo)));
2108
2109                 switch (sfsi.ssi_signo) {
2110
2111                 case SIGCHLD:
2112                         sigchld = true;
2113                         break;
2114
2115                 case SIGTERM:
2116                         if (m->running_as == MANAGER_SYSTEM) {
2117                                 /* This is for compatibility with the
2118                                  * original sysvinit */
2119                                 m->exit_code = MANAGER_REEXECUTE;
2120                                 break;
2121                         }
2122
2123                         /* Fall through */
2124
2125                 case SIGINT:
2126                         if (m->running_as == MANAGER_SYSTEM) {
2127                                 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
2128                                 break;
2129                         }
2130
2131                         /* Run the exit target if there is one, if not, just exit. */
2132                         if (manager_start_target(m, SPECIAL_EXIT_TARGET, JOB_REPLACE) < 0) {
2133                                 m->exit_code = MANAGER_EXIT;
2134                                 return 0;
2135                         }
2136
2137                         break;
2138
2139                 case SIGWINCH:
2140                         if (m->running_as == MANAGER_SYSTEM)
2141                                 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
2142
2143                         /* This is a nop on non-init */
2144                         break;
2145
2146                 case SIGPWR:
2147                         if (m->running_as == MANAGER_SYSTEM)
2148                                 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
2149
2150                         /* This is a nop on non-init */
2151                         break;
2152
2153                 case SIGUSR1: {
2154                         Unit *u;
2155
2156                         u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
2157
2158                         if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
2159                                 log_info("Trying to reconnect to bus...");
2160                                 bus_init(m, true);
2161                         }
2162
2163                         if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
2164                                 log_info("Loading D-Bus service...");
2165                                 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
2166                         }
2167
2168                         break;
2169                 }
2170
2171                 case SIGUSR2: {
2172                         FILE *f;
2173                         char *dump = NULL;
2174                         size_t size;
2175
2176                         if (!(f = open_memstream(&dump, &size))) {
2177                                 log_warning("Failed to allocate memory stream.");
2178                                 break;
2179                         }
2180
2181                         manager_dump_units(m, f, "\t");
2182                         manager_dump_jobs(m, f, "\t");
2183
2184                         if (ferror(f)) {
2185                                 fclose(f);
2186                                 free(dump);
2187                                 log_warning("Failed to write status stream");
2188                                 break;
2189                         }
2190
2191                         fclose(f);
2192                         log_dump(LOG_INFO, dump);
2193                         free(dump);
2194
2195                         break;
2196                 }
2197
2198                 case SIGHUP:
2199                         m->exit_code = MANAGER_RELOAD;
2200                         break;
2201
2202                 default: {
2203                         /* Starting SIGRTMIN+0 */
2204                         static const char * const target_table[] = {
2205                                 [0] = SPECIAL_DEFAULT_TARGET,
2206                                 [1] = SPECIAL_RESCUE_TARGET,
2207                                 [2] = SPECIAL_EMERGENCY_TARGET,
2208                                 [3] = SPECIAL_HALT_TARGET,
2209                                 [4] = SPECIAL_POWEROFF_TARGET,
2210                                 [5] = SPECIAL_REBOOT_TARGET,
2211                                 [6] = SPECIAL_KEXEC_TARGET
2212                         };
2213
2214                         /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
2215                         static const ManagerExitCode code_table[] = {
2216                                 [0] = MANAGER_HALT,
2217                                 [1] = MANAGER_POWEROFF,
2218                                 [2] = MANAGER_REBOOT,
2219                                 [3] = MANAGER_KEXEC
2220                         };
2221
2222                         if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
2223                             (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
2224                                 manager_start_target(m, target_table[sfsi.ssi_signo - SIGRTMIN],
2225                                                      (sfsi.ssi_signo == 1 || sfsi.ssi_signo == 2) ? JOB_ISOLATE : JOB_REPLACE);
2226                                 break;
2227                         }
2228
2229                         if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
2230                             (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(code_table)) {
2231                                 m->exit_code = code_table[sfsi.ssi_signo - SIGRTMIN - 13];
2232                                 break;
2233                         }
2234
2235                         switch (sfsi.ssi_signo - SIGRTMIN) {
2236
2237                         case 20:
2238                                 log_debug("Enabling showing of status.");
2239                                 m->show_status = true;
2240                                 break;
2241
2242                         case 21:
2243                                 log_debug("Disabling showing of status.");
2244                                 m->show_status = false;
2245                                 break;
2246
2247                         default:
2248                                 log_warning("Got unhandled signal <%s>.", strna(signal_to_string(sfsi.ssi_signo)));
2249                         }
2250                 }
2251                 }
2252         }
2253
2254         if (sigchld)
2255                 return manager_dispatch_sigchld(m);
2256
2257         return 0;
2258 }
2259
2260 static int process_event(Manager *m, struct epoll_event *ev) {
2261         int r;
2262         Watch *w;
2263
2264         assert(m);
2265         assert(ev);
2266
2267         assert_se(w = ev->data.ptr);
2268
2269         if (w->type == WATCH_INVALID)
2270                 return 0;
2271
2272         switch (w->type) {
2273
2274         case WATCH_SIGNAL:
2275
2276                 /* An incoming signal? */
2277                 if (ev->events != EPOLLIN)
2278                         return -EINVAL;
2279
2280                 if ((r = manager_process_signal_fd(m)) < 0)
2281                         return r;
2282
2283                 break;
2284
2285         case WATCH_NOTIFY:
2286
2287                 /* An incoming daemon notification event? */
2288                 if (ev->events != EPOLLIN)
2289                         return -EINVAL;
2290
2291                 if ((r = manager_process_notify_fd(m)) < 0)
2292                         return r;
2293
2294                 break;
2295
2296         case WATCH_FD:
2297
2298                 /* Some fd event, to be dispatched to the units */
2299                 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
2300                 break;
2301
2302         case WATCH_UNIT_TIMER:
2303         case WATCH_JOB_TIMER: {
2304                 uint64_t v;
2305                 ssize_t k;
2306
2307                 /* Some timer event, to be dispatched to the units */
2308                 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
2309
2310                         if (k < 0 && (errno == EINTR || errno == EAGAIN))
2311                                 break;
2312
2313                         return k < 0 ? -errno : -EIO;
2314                 }
2315
2316                 if (w->type == WATCH_UNIT_TIMER)
2317                         UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
2318                 else
2319                         job_timer_event(w->data.job, v, w);
2320                 break;
2321         }
2322
2323         case WATCH_MOUNT:
2324                 /* Some mount table change, intended for the mount subsystem */
2325                 mount_fd_event(m, ev->events);
2326                 break;
2327
2328         case WATCH_SWAP:
2329                 /* Some swap table change, intended for the swap subsystem */
2330                 swap_fd_event(m, ev->events);
2331                 break;
2332
2333         case WATCH_UDEV:
2334                 /* Some notification from udev, intended for the device subsystem */
2335                 device_fd_event(m, ev->events);
2336                 break;
2337
2338         case WATCH_DBUS_WATCH:
2339                 bus_watch_event(m, w, ev->events);
2340                 break;
2341
2342         case WATCH_DBUS_TIMEOUT:
2343                 bus_timeout_event(m, w, ev->events);
2344                 break;
2345
2346         default:
2347                 log_error("event type=%i", w->type);
2348                 assert_not_reached("Unknown epoll event type.");
2349         }
2350
2351         return 0;
2352 }
2353
2354 int manager_loop(Manager *m) {
2355         int r;
2356
2357         RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 50000);
2358
2359         assert(m);
2360         m->exit_code = MANAGER_RUNNING;
2361
2362         /* Release the path cache */
2363         set_free_free(m->unit_path_cache);
2364         m->unit_path_cache = NULL;
2365
2366         manager_check_finished(m);
2367
2368         /* There might still be some zombies hanging around from
2369          * before we were exec()'ed. Leat's reap them */
2370         if ((r = manager_dispatch_sigchld(m)) < 0)
2371                 return r;
2372
2373         while (m->exit_code == MANAGER_RUNNING) {
2374                 struct epoll_event event;
2375                 int n;
2376
2377                 if (!ratelimit_test(&rl)) {
2378                         /* Yay, something is going seriously wrong, pause a little */
2379                         log_warning("Looping too fast. Throttling execution a little.");
2380                         sleep(1);
2381                 }
2382
2383                 if (manager_dispatch_load_queue(m) > 0)
2384                         continue;
2385
2386                 if (manager_dispatch_run_queue(m) > 0)
2387                         continue;
2388
2389                 if (bus_dispatch(m) > 0)
2390                         continue;
2391
2392                 if (manager_dispatch_cleanup_queue(m) > 0)
2393                         continue;
2394
2395                 if (manager_dispatch_gc_queue(m) > 0)
2396                         continue;
2397
2398                 if (manager_dispatch_dbus_queue(m) > 0)
2399                         continue;
2400
2401                 if (swap_dispatch_reload(m) > 0)
2402                         continue;
2403
2404                 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2405
2406                         if (errno == EINTR)
2407                                 continue;
2408
2409                         return -errno;
2410                 }
2411
2412                 assert(n == 1);
2413
2414                 if ((r = process_event(m, &event)) < 0)
2415                         return r;
2416         }
2417
2418         return m->exit_code;
2419 }
2420
2421 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2422         char *n;
2423         Unit *u;
2424
2425         assert(m);
2426         assert(s);
2427         assert(_u);
2428
2429         if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2430                 return -EINVAL;
2431
2432         if (!(n = bus_path_unescape(s+31)))
2433                 return -ENOMEM;
2434
2435         u = manager_get_unit(m, n);
2436         free(n);
2437
2438         if (!u)
2439                 return -ENOENT;
2440
2441         *_u = u;
2442
2443         return 0;
2444 }
2445
2446 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2447         Job *j;
2448         unsigned id;
2449         int r;
2450
2451         assert(m);
2452         assert(s);
2453         assert(_j);
2454
2455         if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2456                 return -EINVAL;
2457
2458         if ((r = safe_atou(s + 30, &id)) < 0)
2459                 return r;
2460
2461         if (!(j = manager_get_job(m, id)))
2462                 return -ENOENT;
2463
2464         *_j = j;
2465
2466         return 0;
2467 }
2468
2469 void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
2470
2471 #ifdef HAVE_AUDIT
2472         char *p;
2473
2474         if (m->audit_fd < 0)
2475                 return;
2476
2477         /* Don't generate audit events if the service was already
2478          * started and we're just deserializing */
2479         if (m->n_reloading > 0)
2480                 return;
2481
2482         if (m->running_as != MANAGER_SYSTEM)
2483                 return;
2484
2485         if (u->meta.type != UNIT_SERVICE)
2486                 return;
2487
2488         if (!(p = unit_name_to_prefix_and_instance(u->meta.id))) {
2489                 log_error("Failed to allocate unit name for audit message: %s", strerror(ENOMEM));
2490                 return;
2491         }
2492
2493         if (audit_log_user_comm_message(m->audit_fd, type, "", p, NULL, NULL, NULL, success) < 0) {
2494                 log_warning("Failed to send audit message: %m");
2495
2496                 if (errno == EPERM) {
2497                         /* We aren't allowed to send audit messages?
2498                          * Then let's not retry again, to avoid
2499                          * spamming the user with the same and same
2500                          * messages over and over. */
2501
2502                         audit_close(m->audit_fd);
2503                         m->audit_fd = -1;
2504                 }
2505         }
2506
2507         free(p);
2508 #endif
2509
2510 }
2511
2512 void manager_send_unit_plymouth(Manager *m, Unit *u) {
2513         int fd = -1;
2514         union sockaddr_union sa;
2515         int n = 0;
2516         char *message = NULL;
2517
2518         /* Don't generate plymouth events if the service was already
2519          * started and we're just deserializing */
2520         if (m->n_reloading > 0)
2521                 return;
2522
2523         if (m->running_as != MANAGER_SYSTEM)
2524                 return;
2525
2526         if (u->meta.type != UNIT_SERVICE &&
2527             u->meta.type != UNIT_MOUNT &&
2528             u->meta.type != UNIT_SWAP)
2529                 return;
2530
2531         /* We set SOCK_NONBLOCK here so that we rather drop the
2532          * message then wait for plymouth */
2533         if ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
2534                 log_error("socket() failed: %m");
2535                 return;
2536         }
2537
2538         zero(sa);
2539         sa.sa.sa_family = AF_UNIX;
2540         strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
2541         if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
2542
2543                 if (errno != EPIPE &&
2544                     errno != EAGAIN &&
2545                     errno != ENOENT &&
2546                     errno != ECONNREFUSED &&
2547                     errno != ECONNRESET &&
2548                     errno != ECONNABORTED)
2549                         log_error("connect() failed: %m");
2550
2551                 goto finish;
2552         }
2553
2554         if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->meta.id) + 1), u->meta.id, &n) < 0) {
2555                 log_error("Out of memory");
2556                 goto finish;
2557         }
2558
2559         errno = 0;
2560         if (write(fd, message, n + 1) != n + 1) {
2561
2562                 if (errno != EPIPE &&
2563                     errno != EAGAIN &&
2564                     errno != ENOENT &&
2565                     errno != ECONNREFUSED &&
2566                     errno != ECONNRESET &&
2567                     errno != ECONNABORTED)
2568                         log_error("Failed to write Plymouth message: %m");
2569
2570                 goto finish;
2571         }
2572
2573 finish:
2574         if (fd >= 0)
2575                 close_nointr_nofail(fd);
2576
2577         free(message);
2578 }
2579
2580 void manager_dispatch_bus_name_owner_changed(
2581                 Manager *m,
2582                 const char *name,
2583                 const char* old_owner,
2584                 const char *new_owner) {
2585
2586         Unit *u;
2587
2588         assert(m);
2589         assert(name);
2590
2591         if (!(u = hashmap_get(m->watch_bus, name)))
2592                 return;
2593
2594         UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2595 }
2596
2597 void manager_dispatch_bus_query_pid_done(
2598                 Manager *m,
2599                 const char *name,
2600                 pid_t pid) {
2601
2602         Unit *u;
2603
2604         assert(m);
2605         assert(name);
2606         assert(pid >= 1);
2607
2608         if (!(u = hashmap_get(m->watch_bus, name)))
2609                 return;
2610
2611         UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2612 }
2613
2614 int manager_open_serialization(Manager *m, FILE **_f) {
2615         char *path = NULL;
2616         mode_t saved_umask;
2617         int fd;
2618         FILE *f;
2619
2620         assert(_f);
2621
2622         if (m->running_as == MANAGER_SYSTEM)
2623                 asprintf(&path, "/run/systemd/dump-%lu-XXXXXX", (unsigned long) getpid());
2624         else
2625                 asprintf(&path, "/tmp/systemd-dump-%lu-XXXXXX", (unsigned long) getpid());
2626
2627         if (!path)
2628                 return -ENOMEM;
2629
2630         saved_umask = umask(0077);
2631         fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2632         umask(saved_umask);
2633
2634         if (fd < 0) {
2635                 free(path);
2636                 return -errno;
2637         }
2638
2639         unlink(path);
2640
2641         log_debug("Serializing state to %s", path);
2642         free(path);
2643
2644         if (!(f = fdopen(fd, "w+")))
2645                 return -errno;
2646
2647         *_f = f;
2648
2649         return 0;
2650 }
2651
2652 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2653         Iterator i;
2654         Unit *u;
2655         const char *t;
2656         int r;
2657
2658         assert(m);
2659         assert(f);
2660         assert(fds);
2661
2662         m->n_reloading ++;
2663
2664         fprintf(f, "current-job-id=%i\n", m->current_job_id);
2665         fprintf(f, "taint-usr=%s\n", yes_no(m->taint_usr));
2666
2667         dual_timestamp_serialize(f, "initrd-timestamp", &m->initrd_timestamp);
2668         dual_timestamp_serialize(f, "startup-timestamp", &m->startup_timestamp);
2669         dual_timestamp_serialize(f, "finish-timestamp", &m->finish_timestamp);
2670
2671         fputc('\n', f);
2672
2673         HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2674                 if (u->meta.id != t)
2675                         continue;
2676
2677                 if (!unit_can_serialize(u))
2678                         continue;
2679
2680                 /* Start marker */
2681                 fputs(u->meta.id, f);
2682                 fputc('\n', f);
2683
2684                 if ((r = unit_serialize(u, f, fds)) < 0) {
2685                         m->n_reloading --;
2686                         return r;
2687                 }
2688         }
2689
2690         assert(m->n_reloading > 0);
2691         m->n_reloading --;
2692
2693         if (ferror(f))
2694                 return -EIO;
2695
2696         r = bus_fdset_add_all(m, fds);
2697         if (r < 0)
2698                 return r;
2699
2700         return 0;
2701 }
2702
2703 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2704         int r = 0;
2705
2706         assert(m);
2707         assert(f);
2708
2709         log_debug("Deserializing state...");
2710
2711         m->n_reloading ++;
2712
2713         for (;;) {
2714                 char line[LINE_MAX], *l;
2715
2716                 if (!fgets(line, sizeof(line), f)) {
2717                         if (feof(f))
2718                                 r = 0;
2719                         else
2720                                 r = -errno;
2721
2722                         goto finish;
2723                 }
2724
2725                 char_array_0(line);
2726                 l = strstrip(line);
2727
2728                 if (l[0] == 0)
2729                         break;
2730
2731                 if (startswith(l, "current-job-id=")) {
2732                         uint32_t id;
2733
2734                         if (safe_atou32(l+15, &id) < 0)
2735                                 log_debug("Failed to parse current job id value %s", l+15);
2736                         else
2737                                 m->current_job_id = MAX(m->current_job_id, id);
2738                 } else if (startswith(l, "taint-usr=")) {
2739                         int b;
2740
2741                         if ((b = parse_boolean(l+10)) < 0)
2742                                 log_debug("Failed to parse taint /usr flag %s", l+10);
2743                         else
2744                                 m->taint_usr = m->taint_usr || b;
2745                 } else if (startswith(l, "initrd-timestamp="))
2746                         dual_timestamp_deserialize(l+17, &m->initrd_timestamp);
2747                 else if (startswith(l, "startup-timestamp="))
2748                         dual_timestamp_deserialize(l+18, &m->startup_timestamp);
2749                 else if (startswith(l, "finish-timestamp="))
2750                         dual_timestamp_deserialize(l+17, &m->finish_timestamp);
2751                 else
2752                         log_debug("Unknown serialization item '%s'", l);
2753         }
2754
2755         for (;;) {
2756                 Unit *u;
2757                 char name[UNIT_NAME_MAX+2];
2758
2759                 /* Start marker */
2760                 if (!fgets(name, sizeof(name), f)) {
2761                         if (feof(f))
2762                                 r = 0;
2763                         else
2764                                 r = -errno;
2765
2766                         goto finish;
2767                 }
2768
2769                 char_array_0(name);
2770
2771                 if ((r = manager_load_unit(m, strstrip(name), NULL, NULL, &u)) < 0)
2772                         goto finish;
2773
2774                 if ((r = unit_deserialize(u, f, fds)) < 0)
2775                         goto finish;
2776         }
2777
2778 finish:
2779         if (ferror(f)) {
2780                 r = -EIO;
2781                 goto finish;
2782         }
2783
2784         assert(m->n_reloading > 0);
2785         m->n_reloading --;
2786
2787         return r;
2788 }
2789
2790 int manager_reload(Manager *m) {
2791         int r, q;
2792         FILE *f;
2793         FDSet *fds;
2794
2795         assert(m);
2796
2797         if ((r = manager_open_serialization(m, &f)) < 0)
2798                 return r;
2799
2800         m->n_reloading ++;
2801
2802         if (!(fds = fdset_new())) {
2803                 m->n_reloading --;
2804                 r = -ENOMEM;
2805                 goto finish;
2806         }
2807
2808         if ((r = manager_serialize(m, f, fds)) < 0) {
2809                 m->n_reloading --;
2810                 goto finish;
2811         }
2812
2813         if (fseeko(f, 0, SEEK_SET) < 0) {
2814                 m->n_reloading --;
2815                 r = -errno;
2816                 goto finish;
2817         }
2818
2819         /* From here on there is no way back. */
2820         manager_clear_jobs_and_units(m);
2821         manager_undo_generators(m);
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         /* First, enumerate what we can from all config files */
2833         if ((q = manager_enumerate(m)) < 0)
2834                 r = q;
2835
2836         /* Second, deserialize our stored data */
2837         if ((q = manager_deserialize(m, f, fds)) < 0)
2838                 r = q;
2839
2840         fclose(f);
2841         f = NULL;
2842
2843         /* Third, fire things up! */
2844         if ((q = manager_coldplug(m)) < 0)
2845                 r = q;
2846
2847         assert(m->n_reloading > 0);
2848         m->n_reloading--;
2849
2850 finish:
2851         if (f)
2852                 fclose(f);
2853
2854         if (fds)
2855                 fdset_free(fds);
2856
2857         return r;
2858 }
2859
2860 bool manager_is_booting_or_shutting_down(Manager *m) {
2861         Unit *u;
2862
2863         assert(m);
2864
2865         /* Is the initial job still around? */
2866         if (manager_get_job(m, 1))
2867                 return true;
2868
2869         /* Is there a job for the shutdown target? */
2870         if (((u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET))))
2871                 return !!u->meta.job;
2872
2873         return false;
2874 }
2875
2876 void manager_reset_failed(Manager *m) {
2877         Unit *u;
2878         Iterator i;
2879
2880         assert(m);
2881
2882         HASHMAP_FOREACH(u, m->units, i)
2883                 unit_reset_failed(u);
2884 }
2885
2886 bool manager_unit_pending_inactive(Manager *m, const char *name) {
2887         Unit *u;
2888
2889         assert(m);
2890         assert(name);
2891
2892         /* Returns true if the unit is inactive or going down */
2893         if (!(u = manager_get_unit(m, name)))
2894                 return true;
2895
2896         return unit_pending_inactive(u);
2897 }
2898
2899 void manager_check_finished(Manager *m) {
2900         char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX];
2901         usec_t kernel_usec = 0, initrd_usec = 0, userspace_usec = 0, total_usec = 0;
2902
2903         assert(m);
2904
2905         if (dual_timestamp_is_set(&m->finish_timestamp))
2906                 return;
2907
2908         if (hashmap_size(m->jobs) > 0)
2909                 return;
2910
2911         dual_timestamp_get(&m->finish_timestamp);
2912
2913         if (m->running_as == MANAGER_SYSTEM && detect_container(NULL) <= 0) {
2914
2915                 userspace_usec = m->finish_timestamp.monotonic - m->startup_timestamp.monotonic;
2916                 total_usec = m->finish_timestamp.monotonic;
2917
2918                 if (dual_timestamp_is_set(&m->initrd_timestamp)) {
2919
2920                         kernel_usec = m->initrd_timestamp.monotonic;
2921                         initrd_usec = m->startup_timestamp.monotonic - m->initrd_timestamp.monotonic;
2922
2923                         log_info("Startup finished in %s (kernel) + %s (initrd) + %s (userspace) = %s.",
2924                                  format_timespan(kernel, sizeof(kernel), kernel_usec),
2925                                  format_timespan(initrd, sizeof(initrd), initrd_usec),
2926                                  format_timespan(userspace, sizeof(userspace), userspace_usec),
2927                                  format_timespan(sum, sizeof(sum), total_usec));
2928                 } else {
2929                         kernel_usec = m->startup_timestamp.monotonic;
2930                         initrd_usec = 0;
2931
2932                         log_info("Startup finished in %s (kernel) + %s (userspace) = %s.",
2933                                  format_timespan(kernel, sizeof(kernel), kernel_usec),
2934                                  format_timespan(userspace, sizeof(userspace), userspace_usec),
2935                                  format_timespan(sum, sizeof(sum), total_usec));
2936                 }
2937         } else {
2938                 userspace_usec = initrd_usec = kernel_usec = 0;
2939                 total_usec = m->finish_timestamp.monotonic - m->startup_timestamp.monotonic;
2940
2941                 log_debug("Startup finished in %s.",
2942                           format_timespan(sum, sizeof(sum), total_usec));
2943         }
2944
2945         bus_broadcast_finished(m, kernel_usec, initrd_usec, userspace_usec, total_usec);
2946
2947         sd_notifyf(false,
2948                    "READY=1\nSTATUS=Startup finished in %s.",
2949                    format_timespan(sum, sizeof(sum), total_usec));
2950 }
2951
2952 void manager_run_generators(Manager *m) {
2953         DIR *d = NULL;
2954         const char *generator_path;
2955         const char *argv[3];
2956
2957         assert(m);
2958
2959         generator_path = m->running_as == MANAGER_SYSTEM ? SYSTEM_GENERATOR_PATH : USER_GENERATOR_PATH;
2960         if (!(d = opendir(generator_path))) {
2961
2962                 if (errno == ENOENT)
2963                         return;
2964
2965                 log_error("Failed to enumerate generator directory: %m");
2966                 return;
2967         }
2968
2969         if (!m->generator_unit_path) {
2970                 const char *p;
2971                 char user_path[] = "/tmp/systemd-generator-XXXXXX";
2972
2973                 if (m->running_as == MANAGER_SYSTEM && getpid() == 1) {
2974                         p = "/run/systemd/generator";
2975
2976                         if (mkdir_p(p, 0755) < 0) {
2977                                 log_error("Failed to create generator directory: %m");
2978                                 goto finish;
2979                         }
2980
2981                 } else {
2982                         if (!(p = mkdtemp(user_path))) {
2983                                 log_error("Failed to create generator directory: %m");
2984                                 goto finish;
2985                         }
2986                 }
2987
2988                 if (!(m->generator_unit_path = strdup(p))) {
2989                         log_error("Failed to allocate generator unit path.");
2990                         goto finish;
2991                 }
2992         }
2993
2994         argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */
2995         argv[1] = m->generator_unit_path;
2996         argv[2] = NULL;
2997
2998         execute_directory(generator_path, d, (char**) argv);
2999
3000         if (rmdir(m->generator_unit_path) >= 0) {
3001                 /* Uh? we were able to remove this dir? I guess that
3002                  * means the directory was empty, hence let's shortcut
3003                  * this */
3004
3005                 free(m->generator_unit_path);
3006                 m->generator_unit_path = NULL;
3007                 goto finish;
3008         }
3009
3010         if (!strv_find(m->lookup_paths.unit_path, m->generator_unit_path)) {
3011                 char **l;
3012
3013                 if (!(l = strv_append(m->lookup_paths.unit_path, m->generator_unit_path))) {
3014                         log_error("Failed to add generator directory to unit search path: %m");
3015                         goto finish;
3016                 }
3017
3018                 strv_free(m->lookup_paths.unit_path);
3019                 m->lookup_paths.unit_path = l;
3020
3021                 log_debug("Added generator unit path %s to search path.", m->generator_unit_path);
3022         }
3023
3024 finish:
3025         if (d)
3026                 closedir(d);
3027 }
3028
3029 void manager_undo_generators(Manager *m) {
3030         assert(m);
3031
3032         if (!m->generator_unit_path)
3033                 return;
3034
3035         strv_remove(m->lookup_paths.unit_path, m->generator_unit_path);
3036         rm_rf(m->generator_unit_path, false, true);
3037
3038         free(m->generator_unit_path);
3039         m->generator_unit_path = NULL;
3040 }
3041
3042 int manager_set_default_controllers(Manager *m, char **controllers) {
3043         char **l;
3044
3045         assert(m);
3046
3047         if (!(l = strv_copy(controllers)))
3048                 return -ENOMEM;
3049
3050         strv_free(m->default_controllers);
3051         m->default_controllers = l;
3052
3053         return 0;
3054 }
3055
3056 void manager_recheck_syslog(Manager *m) {
3057         Unit *u;
3058
3059         assert(m);
3060
3061         if (m->running_as != MANAGER_SYSTEM)
3062                 return;
3063
3064         if ((u = manager_get_unit(m, SPECIAL_SYSLOG_SOCKET))) {
3065                 SocketState state;
3066
3067                 state = SOCKET(u)->state;
3068
3069                 if (state != SOCKET_DEAD &&
3070                     state != SOCKET_FAILED &&
3071                     state != SOCKET_RUNNING) {
3072
3073                         /* Hmm, the socket is not set up, or is still
3074                          * listening, let's better not try to use
3075                          * it. Note that we have no problem if the
3076                          * socket is completely down, since there
3077                          * might be a foreign /dev/log socket around
3078                          * and we want to make use of that.
3079                          */
3080
3081                         log_close_syslog();
3082                         return;
3083                 }
3084         }
3085
3086         if ((u = manager_get_unit(m, SPECIAL_SYSLOG_TARGET)))
3087                 if (TARGET(u)->state != TARGET_ACTIVE) {
3088                         log_close_syslog();
3089                         return;
3090                 }
3091
3092         /* Hmm, OK, so the socket is either fully up, or fully down,
3093          * and the target is up, then let's make use of the socket */
3094         log_open();
3095 }
3096
3097 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
3098         [MANAGER_SYSTEM] = "system",
3099         [MANAGER_USER] = "user"
3100 };
3101
3102 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);