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 #include "virt.h"
  63
  64 /* As soon as 16 units are in our GC queue, make sure to run a gc sweep */
  65 #define GC_QUEUE_ENTRIES_MAX 16
  66
  67 /* As soon as 5s passed since a unit was added to our GC queue, make sure to run a gc sweep */
  68 #define GC_QUEUE_USEC_MAX (10*USEC_PER_SEC)
  69
  70 /* Where clients shall send notification messages to */
  71 #define NOTIFY_SOCKET_SYSTEM "/run/systemd/notify"
  72 #define NOTIFY_SOCKET_USER "@/org/freedesktop/systemd1/notify"
  73
  74 static int manager_setup_notify(Manager *m) {
  75         union {
  76                 struct sockaddr sa;
  77                 struct sockaddr_un un;
  78         } sa;
  79         struct epoll_event ev;
  80         int one = 1, r;
  81         mode_t u;
  82
  83         assert(m);
  84
  85         m->notify_watch.type = WATCH_NOTIFY;
  86         if ((m->notify_watch.fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
  87                 log_error("Failed to allocate notification socket: %m");
  88                 return -errno;
  89         }
  90
  91         zero(sa);
  92         sa.sa.sa_family = AF_UNIX;
  93
  94         if (getpid() != 1)
  95                 snprintf(sa.un.sun_path, sizeof(sa.un.sun_path), NOTIFY_SOCKET_USER "/%llu", random_ull());
  96         else {
  97                 unlink(NOTIFY_SOCKET_SYSTEM);
  98                 strncpy(sa.un.sun_path, NOTIFY_SOCKET_SYSTEM, sizeof(sa.un.sun_path));
  99         }
 100
 101         if (sa.un.sun_path[0] == '@')
 102                 sa.un.sun_path[0] = 0;
 103
 104         u = umask(0111);
 105         r = bind(m->notify_watch.fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1));
 106         umask(u);
 107
 108         if (r < 0) {
 109                 log_error("bind() failed: %m");
 110                 return -errno;
 111         }
 112
 113         if (setsockopt(m->notify_watch.fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
 114                 log_error("SO_PASSCRED failed: %m");
 115                 return -errno;
 116         }
 117
 118         zero(ev);
 119         ev.events = EPOLLIN;
 120         ev.data.ptr = &m->notify_watch;
 121
 122         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->notify_watch.fd, &ev) < 0)
 123                 return -errno;
 124
 125         if (sa.un.sun_path[0] == 0)
 126                 sa.un.sun_path[0] = '@';
 127
 128         if (!(m->notify_socket = strdup(sa.un.sun_path)))
 129                 return -ENOMEM;
 130
 131         log_debug("Using notification socket %s", m->notify_socket);
 132
 133         return 0;
 134 }
 135
 136 static int enable_special_signals(Manager *m) {
 137         int fd;
 138
 139         assert(m);
 140
 141         /* Enable that we get SIGINT on control-alt-del */
 142         if (reboot(RB_DISABLE_CAD) < 0)
 143                 log_warning("Failed to enable ctrl-alt-del handling: %m");
 144
 145         if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0)
 146                 log_warning("Failed to open /dev/tty0: %m");
 147         else {
 148                 /* Enable that we get SIGWINCH on kbrequest */
 149                 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
 150                         log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
 151
 152                 close_nointr_nofail(fd);
 153         }
 154
 155         return 0;
 156 }
 157
 158 static int manager_setup_signals(Manager *m) {
 159         sigset_t mask;
 160         struct epoll_event ev;
 161         struct sigaction sa;
 162
 163         assert(m);
 164
 165         /* We are not interested in SIGSTOP and friends. */
 166         zero(sa);
 167         sa.sa_handler = SIG_DFL;
 168         sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
 169         assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 170
 171         assert_se(sigemptyset(&mask) == 0);
 172
 173         sigset_add_many(&mask,
 174                         SIGCHLD,     /* Child died */
 175                         SIGTERM,     /* Reexecute daemon */
 176                         SIGHUP,      /* Reload configuration */
 177                         SIGUSR1,     /* systemd/upstart: reconnect to D-Bus */
 178                         SIGUSR2,     /* systemd: dump status */
 179                         SIGINT,      /* Kernel sends us this on control-alt-del */
 180                         SIGWINCH,    /* Kernel sends us this on kbrequest (alt-arrowup) */
 181                         SIGPWR,      /* Some kernel drivers and upsd send us this on power failure */
 182                         SIGRTMIN+0,  /* systemd: start default.target */
 183                         SIGRTMIN+1,  /* systemd: isolate rescue.target */
 184                         SIGRTMIN+2,  /* systemd: isolate emergency.target */
 185                         SIGRTMIN+3,  /* systemd: start halt.target */
 186                         SIGRTMIN+4,  /* systemd: start poweroff.target */
 187                         SIGRTMIN+5,  /* systemd: start reboot.target */
 188                         SIGRTMIN+6,  /* systemd: start kexec.target */
 189                         SIGRTMIN+13, /* systemd: Immediate halt */
 190                         SIGRTMIN+14, /* systemd: Immediate poweroff */
 191                         SIGRTMIN+15, /* systemd: Immediate reboot */
 192                         SIGRTMIN+16, /* systemd: Immediate kexec */
 193                         SIGRTMIN+20, /* systemd: enable status messages */
 194                         SIGRTMIN+21, /* systemd: disable status messages */
 195                         SIGRTMIN+22, /* systemd: set log level to LOG_DEBUG */
 196                         SIGRTMIN+23, /* systemd: set log level to LOG_INFO */
 197                         SIGRTMIN+27, /* systemd: set log target to console */
 198                         SIGRTMIN+28, /* systemd: set log target to kmsg */
 199                         SIGRTMIN+29, /* systemd: set log target to syslog-or-kmsg */
 200                         -1);
 201         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
 202
 203         m->signal_watch.type = WATCH_SIGNAL;
 204         if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
 205                 return -errno;
 206
 207         zero(ev);
 208         ev.events = EPOLLIN;
 209         ev.data.ptr = &m->signal_watch;
 210
 211         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
 212                 return -errno;
 213
 214         if (m->running_as == MANAGER_SYSTEM)
 215                 return enable_special_signals(m);
 216
 217         return 0;
 218 }
 219
 220 int manager_new(ManagerRunningAs running_as, Manager **_m) {
 221         Manager *m;
 222         int r = -ENOMEM;
 223
 224         assert(_m);
 225         assert(running_as >= 0);
 226         assert(running_as < _MANAGER_RUNNING_AS_MAX);
 227
 228         if (!(m = new0(Manager, 1)))
 229                 return -ENOMEM;
 230
 231         dual_timestamp_get(&m->startup_timestamp);
 232
 233         m->running_as = running_as;
 234         m->name_data_slot = m->subscribed_data_slot = -1;
 235         m->exit_code = _MANAGER_EXIT_CODE_INVALID;
 236         m->pin_cgroupfs_fd = -1;
 237
 238 #ifdef HAVE_AUDIT
 239         m->audit_fd = -1;
 240 #endif
 241
 242         m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = m->swap_watch.fd = -1;
 243         m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
 244
 245         if (!(m->environment = strv_copy(environ)))
 246                 goto fail;
 247
 248         if (!(m->default_controllers = strv_new("cpu", NULL)))
 249                 goto fail;
 250
 251         if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
 252                 goto fail;
 253
 254         if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
 255                 goto fail;
 256
 257         if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
 258                 goto fail;
 259
 260         if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
 261                 goto fail;
 262
 263         if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
 264                 goto fail;
 265
 266         if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
 267                 goto fail;
 268
 269         if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
 270                 goto fail;
 271
 272         if ((r = lookup_paths_init(&m->lookup_paths, m->running_as, true)) < 0)
 273                 goto fail;
 274
 275         if ((r = manager_setup_signals(m)) < 0)
 276                 goto fail;
 277
 278         if ((r = manager_setup_cgroup(m)) < 0)
 279                 goto fail;
 280
 281         if ((r = manager_setup_notify(m)) < 0)
 282                 goto fail;
 283
 284         /* Try to connect to the busses, if possible. */
 285         if ((r = bus_init(m, running_as != MANAGER_SYSTEM)) < 0)
 286                 goto fail;
 287
 288 #ifdef HAVE_AUDIT
 289         if ((m->audit_fd = audit_open()) < 0 &&
 290             /* If the kernel lacks netlink or audit support,
 291              * don't worry about it. */
 292             errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT)
 293                 log_error("Failed to connect to audit log: %m");
 294 #endif
 295
 296         m->taint_usr = dir_is_empty("/usr") > 0;
 297
 298         *_m = m;
 299         return 0;
 300
 301 fail:
 302         manager_free(m);
 303         return r;
 304 }
 305
 306 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
 307         Meta *meta;
 308         unsigned n = 0;
 309
 310         assert(m);
 311
 312         while ((meta = m->cleanup_queue)) {
 313                 assert(meta->in_cleanup_queue);
 314
 315                 unit_free((Unit*) meta);
 316                 n++;
 317         }
 318
 319         return n;
 320 }
 321
 322 enum {
 323         GC_OFFSET_IN_PATH,  /* This one is on the path we were traveling */
 324         GC_OFFSET_UNSURE,   /* No clue */
 325         GC_OFFSET_GOOD,     /* We still need this unit */
 326         GC_OFFSET_BAD,      /* We don't need this unit anymore */
 327         _GC_OFFSET_MAX
 328 };
 329
 330 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
 331         Iterator i;
 332         Unit *other;
 333         bool is_bad;
 334
 335         assert(u);
 336
 337         if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
 338             u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
 339             u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
 340                 return;
 341
 342         if (u->meta.in_cleanup_queue)
 343                 goto bad;
 344
 345         if (unit_check_gc(u))
 346                 goto good;
 347
 348         u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
 349
 350         is_bad = true;
 351
 352         SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
 353                 unit_gc_sweep(other, gc_marker);
 354
 355                 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
 356                         goto good;
 357
 358                 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
 359                         is_bad = false;
 360         }
 361
 362         if (is_bad)
 363                 goto bad;
 364
 365         /* We were unable to find anything out about this entry, so
 366          * let's investigate it later */
 367         u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
 368         unit_add_to_gc_queue(u);
 369         return;
 370
 371 bad:
 372         /* We definitely know that this one is not useful anymore, so
 373          * let's mark it for deletion */
 374         u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
 375         unit_add_to_cleanup_queue(u);
 376         return;
 377
 378 good:
 379         u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
 380 }
 381
 382 static unsigned manager_dispatch_gc_queue(Manager *m) {
 383         Meta *meta;
 384         unsigned n = 0;
 385         unsigned gc_marker;
 386
 387         assert(m);
 388
 389         if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
 390             (m->gc_queue_timestamp <= 0 ||
 391              (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
 392                 return 0;
 393
 394         log_debug("Running GC...");
 395
 396         m->gc_marker += _GC_OFFSET_MAX;
 397         if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
 398                 m->gc_marker = 1;
 399
 400         gc_marker = m->gc_marker;
 401
 402         while ((meta = m->gc_queue)) {
 403                 assert(meta->in_gc_queue);
 404
 405                 unit_gc_sweep((Unit*) meta, gc_marker);
 406
 407                 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
 408                 meta->in_gc_queue = false;
 409
 410                 n++;
 411
 412                 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
 413                     meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
 414                         log_debug("Collecting %s", meta->id);
 415                         meta->gc_marker = gc_marker + GC_OFFSET_BAD;
 416                         unit_add_to_cleanup_queue((Unit*) meta);
 417                 }
 418         }
 419
 420         m->n_in_gc_queue = 0;
 421         m->gc_queue_timestamp = 0;
 422
 423         return n;
 424 }
 425
 426 static void manager_clear_jobs_and_units(Manager *m) {
 427         Job *j;
 428         Unit *u;
 429
 430         assert(m);
 431
 432         while ((j = hashmap_first(m->transaction_jobs)))
 433                 job_free(j);
 434
 435         while ((u = hashmap_first(m->units)))
 436                 unit_free(u);
 437
 438         manager_dispatch_cleanup_queue(m);
 439
 440         assert(!m->load_queue);
 441         assert(!m->run_queue);
 442         assert(!m->dbus_unit_queue);
 443         assert(!m->dbus_job_queue);
 444         assert(!m->cleanup_queue);
 445         assert(!m->gc_queue);
 446
 447         assert(hashmap_isempty(m->transaction_jobs));
 448         assert(hashmap_isempty(m->jobs));
 449         assert(hashmap_isempty(m->units));
 450 }
 451
 452 void manager_free(Manager *m) {
 453         UnitType c;
 454
 455         assert(m);
 456
 457         manager_clear_jobs_and_units(m);
 458
 459         for (c = 0; c < _UNIT_TYPE_MAX; c++)
 460                 if (unit_vtable[c]->shutdown)
 461                         unit_vtable[c]->shutdown(m);
 462
 463         /* If we reexecute ourselves, we keep the root cgroup
 464          * around */
 465         manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
 466
 467         manager_undo_generators(m);
 468
 469         bus_done(m);
 470
 471         hashmap_free(m->units);
 472         hashmap_free(m->jobs);
 473         hashmap_free(m->transaction_jobs);
 474         hashmap_free(m->watch_pids);
 475         hashmap_free(m->watch_bus);
 476
 477         if (m->epoll_fd >= 0)
 478                 close_nointr_nofail(m->epoll_fd);
 479         if (m->signal_watch.fd >= 0)
 480                 close_nointr_nofail(m->signal_watch.fd);
 481         if (m->notify_watch.fd >= 0)
 482                 close_nointr_nofail(m->notify_watch.fd);
 483
 484 #ifdef HAVE_AUDIT
 485         if (m->audit_fd >= 0)
 486                 audit_close(m->audit_fd);
 487 #endif
 488
 489         free(m->notify_socket);
 490
 491         lookup_paths_free(&m->lookup_paths);
 492         strv_free(m->environment);
 493
 494         strv_free(m->default_controllers);
 495
 496         hashmap_free(m->cgroup_bondings);
 497         set_free_free(m->unit_path_cache);
 498
 499         free(m);
 500 }
 501
 502 int manager_enumerate(Manager *m) {
 503         int r = 0, q;
 504         UnitType c;
 505
 506         assert(m);
 507
 508         /* Let's ask every type to load all units from disk/kernel
 509          * that it might know */
 510         for (c = 0; c < _UNIT_TYPE_MAX; c++)
 511                 if (unit_vtable[c]->enumerate)
 512                         if ((q = unit_vtable[c]->enumerate(m)) < 0)
 513                                 r = q;
 514
 515         manager_dispatch_load_queue(m);
 516         return r;
 517 }
 518
 519 int manager_coldplug(Manager *m) {
 520         int r = 0, q;
 521         Iterator i;
 522         Unit *u;
 523         char *k;
 524
 525         assert(m);
 526
 527         /* Then, let's set up their initial state. */
 528         HASHMAP_FOREACH_KEY(u, k, m->units, i) {
 529
 530                 /* ignore aliases */
 531                 if (u->meta.id != k)
 532                         continue;
 533
 534                 if ((q = unit_coldplug(u)) < 0)
 535                         r = q;
 536         }
 537
 538         return r;
 539 }
 540
 541 static void manager_build_unit_path_cache(Manager *m) {
 542         char **i;
 543         DIR *d = NULL;
 544         int r;
 545
 546         assert(m);
 547
 548         set_free_free(m->unit_path_cache);
 549
 550         if (!(m->unit_path_cache = set_new(string_hash_func, string_compare_func))) {
 551                 log_error("Failed to allocate unit path cache.");
 552                 return;
 553         }
 554
 555         /* This simply builds a list of files we know exist, so that
 556          * we don't always have to go to disk */
 557
 558         STRV_FOREACH(i, m->lookup_paths.unit_path) {
 559                 struct dirent *de;
 560
 561                 if (!(d = opendir(*i))) {
 562                         log_error("Failed to open directory: %m");
 563                         continue;
 564                 }
 565
 566                 while ((de = readdir(d))) {
 567                         char *p;
 568
 569                         if (ignore_file(de->d_name))
 570                                 continue;
 571
 572                         p = join(streq(*i, "/") ? "" : *i, "/", de->d_name, NULL);
 573                         if (!p) {
 574                                 r = -ENOMEM;
 575                                 goto fail;
 576                         }
 577
 578                         if ((r = set_put(m->unit_path_cache, p)) < 0) {
 579                                 free(p);
 580                                 goto fail;
 581                         }
 582                 }
 583
 584                 closedir(d);
 585                 d = NULL;
 586         }
 587
 588         return;
 589
 590 fail:
 591         log_error("Failed to build unit path cache: %s", strerror(-r));
 592
 593         set_free_free(m->unit_path_cache);
 594         m->unit_path_cache = NULL;
 595
 596         if (d)
 597                 closedir(d);
 598 }
 599
 600 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
 601         int r, q;
 602
 603         assert(m);
 604
 605         manager_run_generators(m);
 606
 607         manager_build_unit_path_cache(m);
 608
 609         /* If we will deserialize make sure that during enumeration
 610          * this is already known, so we increase the counter here
 611          * already */
 612         if (serialization)
 613                 m->n_reloading ++;
 614
 615         /* First, enumerate what we can from all config files */
 616         r = manager_enumerate(m);
 617
 618         /* Second, deserialize if there is something to deserialize */
 619         if (serialization)
 620                 if ((q = manager_deserialize(m, serialization, fds)) < 0)
 621                         r = q;
 622
 623         /* Third, fire things up! */
 624         if ((q = manager_coldplug(m)) < 0)
 625                 r = q;
 626
 627         if (serialization) {
 628                 assert(m->n_reloading > 0);
 629                 m->n_reloading --;
 630         }
 631
 632         return r;
 633 }
 634
 635 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
 636         assert(m);
 637         assert(j);
 638
 639         /* Deletes one job from the transaction */
 640
 641         manager_transaction_unlink_job(m, j, delete_dependencies);
 642
 643         if (!j->installed)
 644                 job_free(j);
 645 }
 646
 647 static void transaction_delete_unit(Manager *m, Unit *u) {
 648         Job *j;
 649
 650         /* Deletes all jobs associated with a certain unit from the
 651          * transaction */
 652
 653         while ((j = hashmap_get(m->transaction_jobs, u)))
 654                 transaction_delete_job(m, j, true);
 655 }
 656
 657 static void transaction_clean_dependencies(Manager *m) {
 658         Iterator i;
 659         Job *j;
 660
 661         assert(m);
 662
 663         /* Drops all dependencies of all installed jobs */
 664
 665         HASHMAP_FOREACH(j, m->jobs, i) {
 666                 while (j->subject_list)
 667                         job_dependency_free(j->subject_list);
 668                 while (j->object_list)
 669                         job_dependency_free(j->object_list);
 670         }
 671
 672         assert(!m->transaction_anchor);
 673 }
 674
 675 static void transaction_abort(Manager *m) {
 676         Job *j;
 677
 678         assert(m);
 679
 680         while ((j = hashmap_first(m->transaction_jobs)))
 681                 if (j->installed)
 682                         transaction_delete_job(m, j, true);
 683                 else
 684                         job_free(j);
 685
 686         assert(hashmap_isempty(m->transaction_jobs));
 687
 688         transaction_clean_dependencies(m);
 689 }
 690
 691 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
 692         JobDependency *l;
 693
 694         assert(m);
 695
 696         /* A recursive sweep through the graph that marks all units
 697          * that matter to the anchor job, i.e. are directly or
 698          * indirectly a dependency of the anchor job via paths that
 699          * are fully marked as mattering. */
 700
 701         if (j)
 702                 l = j->subject_list;
 703         else
 704                 l = m->transaction_anchor;
 705
 706         LIST_FOREACH(subject, l, l) {
 707
 708                 /* This link does not matter */
 709                 if (!l->matters)
 710                         continue;
 711
 712                 /* This unit has already been marked */
 713                 if (l->object->generation == generation)
 714                         continue;
 715
 716                 l->object->matters_to_anchor = true;
 717                 l->object->generation = generation;
 718
 719                 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
 720         }
 721 }
 722
 723 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
 724         JobDependency *l, *last;
 725
 726         assert(j);
 727         assert(other);
 728         assert(j->unit == other->unit);
 729         assert(!j->installed);
 730
 731         /* Merges 'other' into 'j' and then deletes j. */
 732
 733         j->type = t;
 734         j->state = JOB_WAITING;
 735         j->override = j->override || other->override;
 736
 737         j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
 738
 739         /* Patch us in as new owner of the JobDependency objects */
 740         last = NULL;
 741         LIST_FOREACH(subject, l, other->subject_list) {
 742                 assert(l->subject == other);
 743                 l->subject = j;
 744                 last = l;
 745         }
 746
 747         /* Merge both lists */
 748         if (last) {
 749                 last->subject_next = j->subject_list;
 750                 if (j->subject_list)
 751                         j->subject_list->subject_prev = last;
 752                 j->subject_list = other->subject_list;
 753         }
 754
 755         /* Patch us in as new owner of the JobDependency objects */
 756         last = NULL;
 757         LIST_FOREACH(object, l, other->object_list) {
 758                 assert(l->object == other);
 759                 l->object = j;
 760                 last = l;
 761         }
 762
 763         /* Merge both lists */
 764         if (last) {
 765                 last->object_next = j->object_list;
 766                 if (j->object_list)
 767                         j->object_list->object_prev = last;
 768                 j->object_list = other->object_list;
 769         }
 770
 771         /* Kill the other job */
 772         other->subject_list = NULL;
 773         other->object_list = NULL;
 774         transaction_delete_job(m, other, true);
 775 }
 776 static bool job_is_conflicted_by(Job *j) {
 777         JobDependency *l;
 778
 779         assert(j);
 780
 781         /* Returns true if this job is pulled in by a least one
 782          * ConflictedBy dependency. */
 783
 784         LIST_FOREACH(object, l, j->object_list)
 785                 if (l->conflicts)
 786                         return true;
 787
 788         return false;
 789 }
 790
 791 static int delete_one_unmergeable_job(Manager *m, Job *j) {
 792         Job *k;
 793
 794         assert(j);
 795
 796         /* Tries to delete one item in the linked list
 797          * j->transaction_next->transaction_next->... that conflicts
 798          * with another one, in an attempt to make an inconsistent
 799          * transaction work. */
 800
 801         /* We rely here on the fact that if a merged with b does not
 802          * merge with c, either a or b merge with c neither */
 803         LIST_FOREACH(transaction, j, j)
 804                 LIST_FOREACH(transaction, k, j->transaction_next) {
 805                         Job *d;
 806
 807                         /* Is this one mergeable? Then skip it */
 808                         if (job_type_is_mergeable(j->type, k->type))
 809                                 continue;
 810
 811                         /* Ok, we found two that conflict, let's see if we can
 812                          * drop one of them */
 813                         if (!j->matters_to_anchor && !k->matters_to_anchor) {
 814
 815                                 /* Both jobs don't matter, so let's
 816                                  * find the one that is smarter to
 817                                  * remove. Let's think positive and
 818                                  * rather remove stops then starts --
 819                                  * except if something is being
 820                                  * stopped because it is conflicted by
 821                                  * another unit in which case we
 822                                  * rather remove the start. */
 823
 824                                 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)));
 825                                 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)));
 826
 827                                 if (j->type == JOB_STOP) {
 828
 829                                         if (job_is_conflicted_by(j))
 830                                                 d = k;
 831                                         else
 832                                                 d = j;
 833
 834                                 } else if (k->type == JOB_STOP) {
 835
 836                                         if (job_is_conflicted_by(k))
 837                                                 d = j;
 838                                         else
 839                                                 d = k;
 840                                 } else
 841                                         d = j;
 842
 843                         } else if (!j->matters_to_anchor)
 844                                 d = j;
 845                         else if (!k->matters_to_anchor)
 846                                 d = k;
 847                         else
 848                                 return -ENOEXEC;
 849
 850                         /* Ok, we can drop one, so let's do so. */
 851                         log_debug("Fixing conflicting jobs by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
 852                         transaction_delete_job(m, d, true);
 853                         return 0;
 854                 }
 855
 856         return -EINVAL;
 857 }
 858
 859 static int transaction_merge_jobs(Manager *m, DBusError *e) {
 860         Job *j;
 861         Iterator i;
 862         int r;
 863
 864         assert(m);
 865
 866         /* First step, check whether any of the jobs for one specific
 867          * task conflict. If so, try to drop one of them. */
 868         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 869                 JobType t;
 870                 Job *k;
 871
 872                 t = j->type;
 873                 LIST_FOREACH(transaction, k, j->transaction_next) {
 874                         if (job_type_merge(&t, k->type) >= 0)
 875                                 continue;
 876
 877                         /* OK, we could not merge all jobs for this
 878                          * action. Let's see if we can get rid of one
 879                          * of them */
 880
 881                         if ((r = delete_one_unmergeable_job(m, j)) >= 0)
 882                                 /* Ok, we managed to drop one, now
 883                                  * let's ask our callers to call us
 884                                  * again after garbage collecting */
 885                                 return -EAGAIN;
 886
 887                         /* We couldn't merge anything. Failure */
 888                         dbus_set_error(e, BUS_ERROR_TRANSACTION_JOBS_CONFLICTING, "Transaction contains conflicting jobs '%s' and '%s' for %s. Probably contradicting requirement dependencies configured.",
 889                                        job_type_to_string(t), job_type_to_string(k->type), k->unit->meta.id);
 890                         return r;
 891                 }
 892         }
 893
 894         /* Second step, merge the jobs. */
 895         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 896                 JobType t = j->type;
 897                 Job *k;
 898
 899                 /* Merge all transactions */
 900                 LIST_FOREACH(transaction, k, j->transaction_next)
 901                         assert_se(job_type_merge(&t, k->type) == 0);
 902
 903                 /* If an active job is mergeable, merge it too */
 904                 if (j->unit->meta.job)
 905                         job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
 906
 907                 while ((k = j->transaction_next)) {
 908                         if (j->installed) {
 909                                 transaction_merge_and_delete_job(m, k, j, t);
 910                                 j = k;
 911                         } else
 912                                 transaction_merge_and_delete_job(m, j, k, t);
 913                 }
 914
 915                 if (j->unit->meta.job && !j->installed)
 916                         transaction_merge_and_delete_job(m, j, j->unit->meta.job, t);
 917
 918                 assert(!j->transaction_next);
 919                 assert(!j->transaction_prev);
 920         }
 921
 922         return 0;
 923 }
 924
 925 static void transaction_drop_redundant(Manager *m) {
 926         bool again;
 927
 928         assert(m);
 929
 930         /* Goes through the transaction and removes all jobs that are
 931          * a noop */
 932
 933         do {
 934                 Job *j;
 935                 Iterator i;
 936
 937                 again = false;
 938
 939                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 940                         bool changes_something = false;
 941                         Job *k;
 942
 943                         LIST_FOREACH(transaction, k, j) {
 944
 945                                 if (!job_is_anchor(k) &&
 946                                     (k->installed || job_type_is_redundant(k->type, unit_active_state(k->unit))) &&
 947                                     (!k->unit->meta.job || !job_type_is_conflicting(k->type, k->unit->meta.job->type)))
 948                                         continue;
 949
 950                                 changes_something = true;
 951                                 break;
 952                         }
 953
 954                         if (changes_something)
 955                                 continue;
 956
 957                         /* log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type)); */
 958                         transaction_delete_job(m, j, false);
 959                         again = true;
 960                         break;
 961                 }
 962
 963         } while (again);
 964 }
 965
 966 static bool unit_matters_to_anchor(Unit *u, Job *j) {
 967         assert(u);
 968         assert(!j->transaction_prev);
 969
 970         /* Checks whether at least one of the jobs for this unit
 971          * matters to the anchor. */
 972
 973         LIST_FOREACH(transaction, j, j)
 974                 if (j->matters_to_anchor)
 975                         return true;
 976
 977         return false;
 978 }
 979
 980 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation, DBusError *e) {
 981         Iterator i;
 982         Unit *u;
 983         int r;
 984
 985         assert(m);
 986         assert(j);
 987         assert(!j->transaction_prev);
 988
 989         /* Does a recursive sweep through the ordering graph, looking
 990          * for a cycle. If we find cycle we try to break it. */
 991
 992         /* Have we seen this before? */
 993         if (j->generation == generation) {
 994                 Job *k, *delete;
 995
 996                 /* If the marker is NULL we have been here already and
 997                  * decided the job was loop-free from here. Hence
 998                  * shortcut things and return right-away. */
 999                 if (!j->marker)
1000                         return 0;
1001
1002                 /* So, the marker is not NULL and we already have been
1003                  * here. We have a cycle. Let's try to break it. We go
1004                  * backwards in our path and try to find a suitable
1005                  * job to remove. We use the marker to find our way
1006                  * back, since smart how we are we stored our way back
1007                  * in there. */
1008                 log_warning("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
1009
1010                 delete = NULL;
1011                 for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
1012
1013                         log_info("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
1014
1015                         if (!delete &&
1016                             !k->installed &&
1017                             !unit_matters_to_anchor(k->unit, k)) {
1018                                 /* Ok, we can drop this one, so let's
1019                                  * do so. */
1020                                 delete = k;
1021                         }
1022
1023                         /* Check if this in fact was the beginning of
1024                          * the cycle */
1025                         if (k == j)
1026                                 break;
1027                 }
1028
1029
1030                 if (delete) {
1031                         log_warning("Breaking ordering cycle by deleting job %s/%s", delete->unit->meta.id, job_type_to_string(delete->type));
1032                         transaction_delete_unit(m, delete->unit);
1033                         return -EAGAIN;
1034                 }
1035
1036                 log_error("Unable to break cycle");
1037
1038                 dbus_set_error(e, BUS_ERROR_TRANSACTION_ORDER_IS_CYCLIC, "Transaction order is cyclic. See system logs for details.");
1039                 return -ENOEXEC;
1040         }
1041
1042         /* Make the marker point to where we come from, so that we can
1043          * find our way backwards if we want to break a cycle. We use
1044          * a special marker for the beginning: we point to
1045          * ourselves. */
1046         j->marker = from ? from : j;
1047         j->generation = generation;
1048
1049         /* We assume that the the dependencies are bidirectional, and
1050          * hence can ignore UNIT_AFTER */
1051         SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
1052                 Job *o;
1053
1054                 /* Is there a job for this unit? */
1055                 if (!(o = hashmap_get(m->transaction_jobs, u)))
1056
1057                         /* Ok, there is no job for this in the
1058                          * transaction, but maybe there is already one
1059                          * running? */
1060                         if (!(o = u->meta.job))
1061                                 continue;
1062
1063                 if ((r = transaction_verify_order_one(m, o, j, generation, e)) < 0)
1064                         return r;
1065         }
1066
1067         /* Ok, let's backtrack, and remember that this entry is not on
1068          * our path anymore. */
1069         j->marker = NULL;
1070
1071         return 0;
1072 }
1073
1074 static int transaction_verify_order(Manager *m, unsigned *generation, DBusError *e) {
1075         Job *j;
1076         int r;
1077         Iterator i;
1078         unsigned g;
1079
1080         assert(m);
1081         assert(generation);
1082
1083         /* Check if the ordering graph is cyclic. If it is, try to fix
1084          * that up by dropping one of the jobs. */
1085
1086         g = (*generation)++;
1087
1088         HASHMAP_FOREACH(j, m->transaction_jobs, i)
1089                 if ((r = transaction_verify_order_one(m, j, NULL, g, e)) < 0)
1090                         return r;
1091
1092         return 0;
1093 }
1094
1095 static void transaction_collect_garbage(Manager *m) {
1096         bool again;
1097
1098         assert(m);
1099
1100         /* Drop jobs that are not required by any other job */
1101
1102         do {
1103                 Iterator i;
1104                 Job *j;
1105
1106                 again = false;
1107
1108                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1109                         if (j->object_list) {
1110                                 /* log_debug("Keeping job %s/%s because of %s/%s", */
1111                                 /*           j->unit->meta.id, job_type_to_string(j->type), */
1112                                 /*           j->object_list->subject ? j->object_list->subject->unit->meta.id : "root", */
1113                                 /*           j->object_list->subject ? job_type_to_string(j->object_list->subject->type) : "root"); */
1114                                 continue;
1115                         }
1116
1117                         /* log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type)); */
1118                         transaction_delete_job(m, j, true);
1119                         again = true;
1120                         break;
1121                 }
1122
1123         } while (again);
1124 }
1125
1126 static int transaction_is_destructive(Manager *m, DBusError *e) {
1127         Iterator i;
1128         Job *j;
1129
1130         assert(m);
1131
1132         /* Checks whether applying this transaction means that
1133          * existing jobs would be replaced */
1134
1135         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1136
1137                 /* Assume merged */
1138                 assert(!j->transaction_prev);
1139                 assert(!j->transaction_next);
1140
1141                 if (j->unit->meta.job &&
1142                     j->unit->meta.job != j &&
1143                     !job_type_is_superset(j->type, j->unit->meta.job->type)) {
1144
1145                         dbus_set_error(e, BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE, "Transaction is destructive.");
1146                         return -EEXIST;
1147                 }
1148         }
1149
1150         return 0;
1151 }
1152
1153 static void transaction_minimize_impact(Manager *m) {
1154         bool again;
1155         assert(m);
1156
1157         /* Drops all unnecessary jobs that reverse already active jobs
1158          * or that stop a running service. */
1159
1160         do {
1161                 Job *j;
1162                 Iterator i;
1163
1164                 again = false;
1165
1166                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1167                         LIST_FOREACH(transaction, j, j) {
1168                                 bool stops_running_service, changes_existing_job;
1169
1170                                 /* If it matters, we shouldn't drop it */
1171                                 if (j->matters_to_anchor)
1172                                         continue;
1173
1174                                 /* Would this stop a running service?
1175                                  * Would this change an existing job?
1176                                  * If so, let's drop this entry */
1177
1178                                 stops_running_service =
1179                                         j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1180
1181                                 changes_existing_job =
1182                                         j->unit->meta.job &&
1183                                         job_type_is_conflicting(j->type, j->unit->meta.job->type);
1184
1185                                 if (!stops_running_service && !changes_existing_job)
1186                                         continue;
1187
1188                                 if (stops_running_service)
1189                                         log_debug("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1190
1191                                 if (changes_existing_job)
1192                                         log_debug("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1193
1194                                 /* Ok, let's get rid of this */
1195                                 log_debug("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1196
1197                                 transaction_delete_job(m, j, true);
1198                                 again = true;
1199                                 break;
1200                         }
1201
1202                         if (again)
1203                                 break;
1204                 }
1205
1206         } while (again);
1207 }
1208
1209 static int transaction_apply(Manager *m, JobMode mode) {
1210         Iterator i;
1211         Job *j;
1212         int r;
1213
1214         /* Moves the transaction jobs to the set of active jobs */
1215
1216         if (mode == JOB_ISOLATE) {
1217
1218                 /* When isolating first kill all installed jobs which
1219                  * aren't part of the new transaction */
1220         rescan:
1221                 HASHMAP_FOREACH(j, m->jobs, i) {
1222                         assert(j->installed);
1223
1224                         if (hashmap_get(m->transaction_jobs, j->unit))
1225                                 continue;
1226
1227                         /* 'j' itself is safe to remove, but if other jobs
1228                            are invalidated recursively, our iterator may become
1229                            invalid and we need to start over. */
1230                         if (job_finish_and_invalidate(j, JOB_CANCELED) > 0)
1231                                 goto rescan;
1232                 }
1233         }
1234
1235         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1236                 /* Assume merged */
1237                 assert(!j->transaction_prev);
1238                 assert(!j->transaction_next);
1239
1240                 if (j->installed)
1241                         continue;
1242
1243                 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1244                         goto rollback;
1245         }
1246
1247         while ((j = hashmap_steal_first(m->transaction_jobs))) {
1248                 if (j->installed) {
1249                         /* log_debug("Skipping already installed job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id); */
1250                         continue;
1251                 }
1252
1253                 if (j->unit->meta.job)
1254                         job_free(j->unit->meta.job);
1255
1256                 j->unit->meta.job = j;
1257                 j->installed = true;
1258                 m->n_installed_jobs ++;
1259
1260                 /* We're fully installed. Now let's free data we don't
1261                  * need anymore. */
1262
1263                 assert(!j->transaction_next);
1264                 assert(!j->transaction_prev);
1265
1266                 job_add_to_run_queue(j);
1267                 job_add_to_dbus_queue(j);
1268                 job_start_timer(j);
1269
1270                 log_debug("Installed new job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id);
1271         }
1272
1273         /* As last step, kill all remaining job dependencies. */
1274         transaction_clean_dependencies(m);
1275
1276         return 0;
1277
1278 rollback:
1279
1280         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1281                 if (j->installed)
1282                         continue;
1283
1284                 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1285         }
1286
1287         return r;
1288 }
1289
1290 static int transaction_activate(Manager *m, JobMode mode, DBusError *e) {
1291         int r;
1292         unsigned generation = 1;
1293
1294         assert(m);
1295
1296         /* This applies the changes recorded in transaction_jobs to
1297          * the actual list of jobs, if possible. */
1298
1299         /* First step: figure out which jobs matter */
1300         transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1301
1302         /* Second step: Try not to stop any running services if
1303          * we don't have to. Don't try to reverse running
1304          * jobs if we don't have to. */
1305         if (mode == JOB_FAIL)
1306                 transaction_minimize_impact(m);
1307
1308         /* Third step: Drop redundant jobs */
1309         transaction_drop_redundant(m);
1310
1311         for (;;) {
1312                 /* Fourth step: Let's remove unneeded jobs that might
1313                  * be lurking. */
1314                 if (mode != JOB_ISOLATE)
1315                         transaction_collect_garbage(m);
1316
1317                 /* Fifth step: verify order makes sense and correct
1318                  * cycles if necessary and possible */
1319                 if ((r = transaction_verify_order(m, &generation, e)) >= 0)
1320                         break;
1321
1322                 if (r != -EAGAIN) {
1323                         log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r));
1324                         goto rollback;
1325                 }
1326
1327                 /* Let's see if the resulting transaction ordering
1328                  * graph is still cyclic... */
1329         }
1330
1331         for (;;) {
1332                 /* Sixth step: let's drop unmergeable entries if
1333                  * necessary and possible, merge entries we can
1334                  * merge */
1335                 if ((r = transaction_merge_jobs(m, e)) >= 0)
1336                         break;
1337
1338                 if (r != -EAGAIN) {
1339                         log_warning("Requested transaction contains unmergeable jobs: %s", bus_error(e, r));
1340                         goto rollback;
1341                 }
1342
1343                 /* Seventh step: an entry got dropped, let's garbage
1344                  * collect its dependencies. */
1345                 if (mode != JOB_ISOLATE)
1346                         transaction_collect_garbage(m);
1347
1348                 /* Let's see if the resulting transaction still has
1349                  * unmergeable entries ... */
1350         }
1351
1352         /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1353         transaction_drop_redundant(m);
1354
1355         /* Ninth step: check whether we can actually apply this */
1356         if (mode == JOB_FAIL)
1357                 if ((r = transaction_is_destructive(m, e)) < 0) {
1358                         log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r));
1359                         goto rollback;
1360                 }
1361
1362         /* Tenth step: apply changes */
1363         if ((r = transaction_apply(m, mode)) < 0) {
1364                 log_warning("Failed to apply transaction: %s", strerror(-r));
1365                 goto rollback;
1366         }
1367
1368         assert(hashmap_isempty(m->transaction_jobs));
1369         assert(!m->transaction_anchor);
1370
1371         return 0;
1372
1373 rollback:
1374         transaction_abort(m);
1375         return r;
1376 }
1377
1378 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1379         Job *j, *f;
1380
1381         assert(m);
1382         assert(unit);
1383
1384         /* Looks for an existing prospective job and returns that. If
1385          * it doesn't exist it is created and added to the prospective
1386          * jobs list. */
1387
1388         f = hashmap_get(m->transaction_jobs, unit);
1389
1390         LIST_FOREACH(transaction, j, f) {
1391                 assert(j->unit == unit);
1392
1393                 if (j->type == type) {
1394                         if (is_new)
1395                                 *is_new = false;
1396                         return j;
1397                 }
1398         }
1399
1400         if (unit->meta.job && unit->meta.job->type == type)
1401                 j = unit->meta.job;
1402         else if (!(j = job_new(m, type, unit)))
1403                 return NULL;
1404
1405         j->generation = 0;
1406         j->marker = NULL;
1407         j->matters_to_anchor = false;
1408         j->override = override;
1409
1410         LIST_PREPEND(Job, transaction, f, j);
1411
1412         if (hashmap_replace(m->transaction_jobs, unit, f) < 0) {
1413                 job_free(j);
1414                 return NULL;
1415         }
1416
1417         if (is_new)
1418                 *is_new = true;
1419
1420         /* log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type)); */
1421
1422         return j;
1423 }
1424
1425 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1426         assert(m);
1427         assert(j);
1428
1429         if (j->transaction_prev)
1430                 j->transaction_prev->transaction_next = j->transaction_next;
1431         else if (j->transaction_next)
1432                 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1433         else
1434                 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1435
1436         if (j->transaction_next)
1437                 j->transaction_next->transaction_prev = j->transaction_prev;
1438
1439         j->transaction_prev = j->transaction_next = NULL;
1440
1441         while (j->subject_list)
1442                 job_dependency_free(j->subject_list);
1443
1444         while (j->object_list) {
1445                 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1446
1447                 job_dependency_free(j->object_list);
1448
1449                 if (other && delete_dependencies) {
1450                         log_debug("Deleting job %s/%s as dependency of job %s/%s",
1451                                   other->unit->meta.id, job_type_to_string(other->type),
1452                                   j->unit->meta.id, job_type_to_string(j->type));
1453                         transaction_delete_job(m, other, delete_dependencies);
1454                 }
1455         }
1456 }
1457
1458 static int transaction_add_job_and_dependencies(
1459                 Manager *m,
1460                 JobType type,
1461                 Unit *unit,
1462                 Job *by,
1463                 bool matters,
1464                 bool override,
1465                 bool conflicts,
1466                 bool ignore_requirements,
1467                 bool ignore_order,
1468                 DBusError *e,
1469                 Job **_ret) {
1470         Job *ret;
1471         Iterator i;
1472         Unit *dep;
1473         int r;
1474         bool is_new;
1475
1476         assert(m);
1477         assert(type < _JOB_TYPE_MAX);
1478         assert(unit);
1479
1480         /* log_debug("Pulling in %s/%s from %s/%s", */
1481         /*           unit->meta.id, job_type_to_string(type), */
1482         /*           by ? by->unit->meta.id : "NA", */
1483         /*           by ? job_type_to_string(by->type) : "NA"); */
1484
1485         if (unit->meta.load_state != UNIT_LOADED &&
1486             unit->meta.load_state != UNIT_ERROR &&
1487             unit->meta.load_state != UNIT_MASKED) {
1488                 dbus_set_error(e, BUS_ERROR_LOAD_FAILED, "Unit %s is not loaded properly.", unit->meta.id);
1489                 return -EINVAL;
1490         }
1491
1492         if (type != JOB_STOP && unit->meta.load_state == UNIT_ERROR) {
1493                 dbus_set_error(e, BUS_ERROR_LOAD_FAILED,
1494                                "Unit %s failed to load: %s. "
1495                                "See system logs and 'systemctl status %s' for details.",
1496                                unit->meta.id,
1497                                strerror(-unit->meta.load_error),
1498                                unit->meta.id);
1499                 return -EINVAL;
1500         }
1501
1502         if (type != JOB_STOP && unit->meta.load_state == UNIT_MASKED) {
1503                 dbus_set_error(e, BUS_ERROR_MASKED, "Unit %s is masked.", unit->meta.id);
1504                 return -EINVAL;
1505         }
1506
1507         if (!unit_job_is_applicable(unit, type)) {
1508                 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);
1509                 return -EBADR;
1510         }
1511
1512         /* First add the job. */
1513         if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1514                 return -ENOMEM;
1515
1516         ret->ignore_order = ret->ignore_order || ignore_order;
1517
1518         /* Then, add a link to the job. */
1519         if (!job_dependency_new(by, ret, matters, conflicts))
1520                 return -ENOMEM;
1521
1522         if (is_new && !ignore_requirements) {
1523                 Set *following;
1524
1525                 /* If we are following some other unit, make sure we
1526                  * add all dependencies of everybody following. */
1527                 if (unit_following_set(ret->unit, &following) > 0) {
1528                         SET_FOREACH(dep, following, i)
1529                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
1530                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1531
1532                                         if (e)
1533                                                 dbus_error_free(e);
1534                                 }
1535
1536                         set_free(following);
1537                 }
1538
1539                 /* Finally, recursively add in all dependencies. */
1540                 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1541                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1542                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1543                                         if (r != -EBADR)
1544                                                 goto fail;
1545
1546                                         if (e)
1547                                                 dbus_error_free(e);
1548                                 }
1549
1550                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BIND_TO], i)
1551                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1552
1553                                         if (r != -EBADR)
1554                                                 goto fail;
1555
1556                                         if (e)
1557                                                 dbus_error_free(e);
1558                                 }
1559
1560                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1561                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
1562                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1563
1564                                         if (e)
1565                                                 dbus_error_free(e);
1566                                 }
1567
1568                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1569                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, false, false, ignore_order, e, NULL)) < 0) {
1570                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1571
1572                                         if (e)
1573                                                 dbus_error_free(e);
1574                                 }
1575
1576                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1577                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1578
1579                                         if (r != -EBADR)
1580                                                 goto fail;
1581
1582                                         if (e)
1583                                                 dbus_error_free(e);
1584                                 }
1585
1586                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1587                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
1588                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1589
1590                                         if (e)
1591                                                 dbus_error_free(e);
1592                                 }
1593
1594                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1595                                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, true, 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_CONFLICTED_BY], i)
1605                                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
1606                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1607
1608                                         if (e)
1609                                                 dbus_error_free(e);
1610                                 }
1611
1612                 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1613
1614                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1615                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1616
1617                                         if (r != -EBADR)
1618                                                 goto fail;
1619
1620                                         if (e)
1621                                                 dbus_error_free(e);
1622                                 }
1623
1624                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BOUND_BY], i)
1625                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1626
1627                                         if (r != -EBADR)
1628                                                 goto fail;
1629
1630                                         if (e)
1631                                                 dbus_error_free(e);
1632                                 }
1633                 }
1634
1635                 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1636         }
1637
1638         if (_ret)
1639                 *_ret = ret;
1640
1641         return 0;
1642
1643 fail:
1644         return r;
1645 }
1646
1647 static int transaction_add_isolate_jobs(Manager *m) {
1648         Iterator i;
1649         Unit *u;
1650         char *k;
1651         int r;
1652
1653         assert(m);
1654
1655         HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1656
1657                 /* ignore aliases */
1658                 if (u->meta.id != k)
1659                         continue;
1660
1661                 if (u->meta.ignore_on_isolate)
1662                         continue;
1663
1664                 /* No need to stop inactive jobs */
1665                 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)) && !u->meta.job)
1666                         continue;
1667
1668                 /* Is there already something listed for this? */
1669                 if (hashmap_get(m->transaction_jobs, u))
1670                         continue;
1671
1672                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, false, false, false, NULL, NULL)) < 0)
1673                         log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1674         }
1675
1676         return 0;
1677 }
1678
1679 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, DBusError *e, Job **_ret) {
1680         int r;
1681         Job *ret;
1682
1683         assert(m);
1684         assert(type < _JOB_TYPE_MAX);
1685         assert(unit);
1686         assert(mode < _JOB_MODE_MAX);
1687
1688         if (mode == JOB_ISOLATE && type != JOB_START) {
1689                 dbus_set_error(e, BUS_ERROR_INVALID_JOB_MODE, "Isolate is only valid for start.");
1690                 return -EINVAL;
1691         }
1692
1693         if (mode == JOB_ISOLATE && !unit->meta.allow_isolate) {
1694                 dbus_set_error(e, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
1695                 return -EPERM;
1696         }
1697
1698         log_debug("Trying to enqueue job %s/%s/%s", unit->meta.id, job_type_to_string(type), job_mode_to_string(mode));
1699
1700         if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, false,
1701                                                       mode == JOB_IGNORE_DEPENDENCIES || mode == JOB_IGNORE_REQUIREMENTS,
1702                                                       mode == JOB_IGNORE_DEPENDENCIES, e, &ret)) < 0) {
1703                 transaction_abort(m);
1704                 return r;
1705         }
1706
1707         if (mode == JOB_ISOLATE)
1708                 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1709                         transaction_abort(m);
1710                         return r;
1711                 }
1712
1713         if ((r = transaction_activate(m, mode, e)) < 0)
1714                 return r;
1715
1716         log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1717
1718         if (_ret)
1719                 *_ret = ret;
1720
1721         return 0;
1722 }
1723
1724 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, DBusError *e, Job **_ret) {
1725         Unit *unit;
1726         int r;
1727
1728         assert(m);
1729         assert(type < _JOB_TYPE_MAX);
1730         assert(name);
1731         assert(mode < _JOB_MODE_MAX);
1732
1733         if ((r = manager_load_unit(m, name, NULL, NULL, &unit)) < 0)
1734                 return r;
1735
1736         return manager_add_job(m, type, unit, mode, override, e, _ret);
1737 }
1738
1739 Job *manager_get_job(Manager *m, uint32_t id) {
1740         assert(m);
1741
1742         return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1743 }
1744
1745 Unit *manager_get_unit(Manager *m, const char *name) {
1746         assert(m);
1747         assert(name);
1748
1749         return hashmap_get(m->units, name);
1750 }
1751
1752 unsigned manager_dispatch_load_queue(Manager *m) {
1753         Meta *meta;
1754         unsigned n = 0;
1755
1756         assert(m);
1757
1758         /* Make sure we are not run recursively */
1759         if (m->dispatching_load_queue)
1760                 return 0;
1761
1762         m->dispatching_load_queue = true;
1763
1764         /* Dispatches the load queue. Takes a unit from the queue and
1765          * tries to load its data until the queue is empty */
1766
1767         while ((meta = m->load_queue)) {
1768                 assert(meta->in_load_queue);
1769
1770                 unit_load((Unit*) meta);
1771                 n++;
1772         }
1773
1774         m->dispatching_load_queue = false;
1775         return n;
1776 }
1777
1778 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1779         Unit *ret;
1780         int r;
1781
1782         assert(m);
1783         assert(name || path);
1784
1785         /* This will prepare the unit for loading, but not actually
1786          * load anything from disk. */
1787
1788         if (path && !is_path(path)) {
1789                 dbus_set_error(e, BUS_ERROR_INVALID_PATH, "Path %s is not absolute.", path);
1790                 return -EINVAL;
1791         }
1792
1793         if (!name)
1794                 name = file_name_from_path(path);
1795
1796         if (!unit_name_is_valid(name, false)) {
1797                 dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
1798                 return -EINVAL;
1799         }
1800
1801         if ((ret = manager_get_unit(m, name))) {
1802                 *_ret = ret;
1803                 return 1;
1804         }
1805
1806         if (!(ret = unit_new(m)))
1807                 return -ENOMEM;
1808
1809         if (path)
1810                 if (!(ret->meta.fragment_path = strdup(path))) {
1811                         unit_free(ret);
1812                         return -ENOMEM;
1813                 }
1814
1815         if ((r = unit_add_name(ret, name)) < 0) {
1816                 unit_free(ret);
1817                 return r;
1818         }
1819
1820         unit_add_to_load_queue(ret);
1821         unit_add_to_dbus_queue(ret);
1822         unit_add_to_gc_queue(ret);
1823
1824         if (_ret)
1825                 *_ret = ret;
1826
1827         return 0;
1828 }
1829
1830 int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1831         int r;
1832
1833         assert(m);
1834
1835         /* This will load the service information files, but not actually
1836          * start any services or anything. */
1837
1838         if ((r = manager_load_unit_prepare(m, name, path, e, _ret)) != 0)
1839                 return r;
1840
1841         manager_dispatch_load_queue(m);
1842
1843         if (_ret)
1844                 *_ret = unit_follow_merge(*_ret);
1845
1846         return 0;
1847 }
1848
1849 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1850         Iterator i;
1851         Job *j;
1852
1853         assert(s);
1854         assert(f);
1855
1856         HASHMAP_FOREACH(j, s->jobs, i)
1857                 job_dump(j, f, prefix);
1858 }
1859
1860 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1861         Iterator i;
1862         Unit *u;
1863         const char *t;
1864
1865         assert(s);
1866         assert(f);
1867
1868         HASHMAP_FOREACH_KEY(u, t, s->units, i)
1869                 if (u->meta.id == t)
1870                         unit_dump(u, f, prefix);
1871 }
1872
1873 void manager_clear_jobs(Manager *m) {
1874         Job *j;
1875
1876         assert(m);
1877
1878         transaction_abort(m);
1879
1880         while ((j = hashmap_first(m->jobs)))
1881                 job_finish_and_invalidate(j, JOB_CANCELED);
1882 }
1883
1884 unsigned manager_dispatch_run_queue(Manager *m) {
1885         Job *j;
1886         unsigned n = 0;
1887
1888         if (m->dispatching_run_queue)
1889                 return 0;
1890
1891         m->dispatching_run_queue = true;
1892
1893         while ((j = m->run_queue)) {
1894                 assert(j->installed);
1895                 assert(j->in_run_queue);
1896
1897                 job_run_and_invalidate(j);
1898                 n++;
1899         }
1900
1901         m->dispatching_run_queue = false;
1902         return n;
1903 }
1904
1905 unsigned manager_dispatch_dbus_queue(Manager *m) {
1906         Job *j;
1907         Meta *meta;
1908         unsigned n = 0;
1909
1910         assert(m);
1911
1912         if (m->dispatching_dbus_queue)
1913                 return 0;
1914
1915         m->dispatching_dbus_queue = true;
1916
1917         while ((meta = m->dbus_unit_queue)) {
1918                 assert(meta->in_dbus_queue);
1919
1920                 bus_unit_send_change_signal((Unit*) meta);
1921                 n++;
1922         }
1923
1924         while ((j = m->dbus_job_queue)) {
1925                 assert(j->in_dbus_queue);
1926
1927                 bus_job_send_change_signal(j);
1928                 n++;
1929         }
1930
1931         m->dispatching_dbus_queue = false;
1932         return n;
1933 }
1934
1935 static int manager_process_notify_fd(Manager *m) {
1936         ssize_t n;
1937
1938         assert(m);
1939
1940         for (;;) {
1941                 char buf[4096];
1942                 struct msghdr msghdr;
1943                 struct iovec iovec;
1944                 struct ucred *ucred;
1945                 union {
1946                         struct cmsghdr cmsghdr;
1947                         uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1948                 } control;
1949                 Unit *u;
1950                 char **tags;
1951
1952                 zero(iovec);
1953                 iovec.iov_base = buf;
1954                 iovec.iov_len = sizeof(buf)-1;
1955
1956                 zero(control);
1957                 zero(msghdr);
1958                 msghdr.msg_iov = &iovec;
1959                 msghdr.msg_iovlen = 1;
1960                 msghdr.msg_control = &control;
1961                 msghdr.msg_controllen = sizeof(control);
1962
1963                 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1964                         if (n >= 0)
1965                                 return -EIO;
1966
1967                         if (errno == EAGAIN || errno == EINTR)
1968                                 break;
1969
1970                         return -errno;
1971                 }
1972
1973                 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1974                     control.cmsghdr.cmsg_level != SOL_SOCKET ||
1975                     control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1976                     control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1977                         log_warning("Received notify message without credentials. Ignoring.");
1978                         continue;
1979                 }
1980
1981                 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1982
1983                 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(ucred->pid))))
1984                         if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1985                                 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1986                                 continue;
1987                         }
1988
1989                 assert((size_t) n < sizeof(buf));
1990                 buf[n] = 0;
1991                 if (!(tags = strv_split(buf, "\n\r")))
1992                         return -ENOMEM;
1993
1994                 log_debug("Got notification message for unit %s", u->meta.id);
1995
1996                 if (UNIT_VTABLE(u)->notify_message)
1997                         UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
1998
1999                 strv_free(tags);
2000         }
2001
2002         return 0;
2003 }
2004
2005 static int manager_dispatch_sigchld(Manager *m) {
2006         assert(m);
2007
2008         for (;;) {
2009                 siginfo_t si;
2010                 Unit *u;
2011                 int r;
2012
2013                 zero(si);
2014
2015                 /* First we call waitd() for a PID and do not reap the
2016                  * zombie. That way we can still access /proc/$PID for
2017                  * it while it is a zombie. */
2018                 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
2019
2020                         if (errno == ECHILD)
2021                                 break;
2022
2023                         if (errno == EINTR)
2024                                 continue;
2025
2026                         return -errno;
2027                 }
2028
2029                 if (si.si_pid <= 0)
2030                         break;
2031
2032                 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
2033                         char *name = NULL;
2034
2035                         get_process_name(si.si_pid, &name);
2036                         log_debug("Got SIGCHLD for process %lu (%s)", (unsigned long) si.si_pid, strna(name));
2037                         free(name);
2038                 }
2039
2040                 /* Let's flush any message the dying child might still
2041                  * have queued for us. This ensures that the process
2042                  * still exists in /proc so that we can figure out
2043                  * which cgroup and hence unit it belongs to. */
2044                 if ((r = manager_process_notify_fd(m)) < 0)
2045                         return r;
2046
2047                 /* And now figure out the unit this belongs to */
2048                 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(si.si_pid))))
2049                         u = cgroup_unit_by_pid(m, si.si_pid);
2050
2051                 /* And now, we actually reap the zombie. */
2052                 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
2053                         if (errno == EINTR)
2054                                 continue;
2055
2056                         return -errno;
2057                 }
2058
2059                 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
2060                         continue;
2061
2062                 log_debug("Child %lu died (code=%s, status=%i/%s)",
2063                           (long unsigned) si.si_pid,
2064                           sigchld_code_to_string(si.si_code),
2065                           si.si_status,
2066                           strna(si.si_code == CLD_EXITED
2067                                 ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
2068                                 : signal_to_string(si.si_status)));
2069
2070                 if (!u)
2071                         continue;
2072
2073                 log_debug("Child %lu belongs to %s", (long unsigned) si.si_pid, u->meta.id);
2074
2075                 hashmap_remove(m->watch_pids, LONG_TO_PTR(si.si_pid));
2076                 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
2077         }
2078
2079         return 0;
2080 }
2081
2082 static int manager_start_target(Manager *m, const char *name, JobMode mode) {
2083         int r;
2084         DBusError error;
2085
2086         dbus_error_init(&error);
2087
2088         log_debug("Activating special unit %s", name);
2089
2090         if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL)) < 0)
2091                 log_error("Failed to enqueue %s job: %s", name, bus_error(&error, r));
2092
2093         dbus_error_free(&error);
2094
2095         return r;
2096 }
2097
2098 static int manager_process_signal_fd(Manager *m) {
2099         ssize_t n;
2100         struct signalfd_siginfo sfsi;
2101         bool sigchld = false;
2102
2103         assert(m);
2104
2105         for (;;) {
2106                 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
2107
2108                         if (n >= 0)
2109                                 return -EIO;
2110
2111                         if (errno == EINTR || errno == EAGAIN)
2112                                 break;
2113
2114                         return -errno;
2115                 }
2116
2117                 if (sfsi.ssi_pid > 0) {
2118                         char *p = NULL;
2119
2120                         get_process_name(sfsi.ssi_pid, &p);
2121
2122                         log_debug("Received SIG%s from PID %lu (%s).",
2123                                   signal_to_string(sfsi.ssi_signo),
2124                                   (unsigned long) sfsi.ssi_pid, strna(p));
2125                         free(p);
2126                 } else
2127                         log_debug("Received SIG%s.", signal_to_string(sfsi.ssi_signo));
2128
2129                 switch (sfsi.ssi_signo) {
2130
2131                 case SIGCHLD:
2132                         sigchld = true;
2133                         break;
2134
2135                 case SIGTERM:
2136                         if (m->running_as == MANAGER_SYSTEM) {
2137                                 /* This is for compatibility with the
2138                                  * original sysvinit */
2139                                 m->exit_code = MANAGER_REEXECUTE;
2140                                 break;
2141                         }
2142
2143                         /* Fall through */
2144
2145                 case SIGINT:
2146                         if (m->running_as == MANAGER_SYSTEM) {
2147                                 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
2148                                 break;
2149                         }
2150
2151                         /* Run the exit target if there is one, if not, just exit. */
2152                         if (manager_start_target(m, SPECIAL_EXIT_TARGET, JOB_REPLACE) < 0) {
2153                                 m->exit_code = MANAGER_EXIT;
2154                                 return 0;
2155                         }
2156
2157                         break;
2158
2159                 case SIGWINCH:
2160                         if (m->running_as == MANAGER_SYSTEM)
2161                                 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
2162
2163                         /* This is a nop on non-init */
2164                         break;
2165
2166                 case SIGPWR:
2167                         if (m->running_as == MANAGER_SYSTEM)
2168                                 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
2169
2170                         /* This is a nop on non-init */
2171                         break;
2172
2173                 case SIGUSR1: {
2174                         Unit *u;
2175
2176                         u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
2177
2178                         if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
2179                                 log_info("Trying to reconnect to bus...");
2180                                 bus_init(m, true);
2181                         }
2182
2183                         if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
2184                                 log_info("Loading D-Bus service...");
2185                                 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
2186                         }
2187
2188                         break;
2189                 }
2190
2191                 case SIGUSR2: {
2192                         FILE *f;
2193                         char *dump = NULL;
2194                         size_t size;
2195
2196                         if (!(f = open_memstream(&dump, &size))) {
2197                                 log_warning("Failed to allocate memory stream.");
2198                                 break;
2199                         }
2200
2201                         manager_dump_units(m, f, "\t");
2202                         manager_dump_jobs(m, f, "\t");
2203
2204                         if (ferror(f)) {
2205                                 fclose(f);
2206                                 free(dump);
2207                                 log_warning("Failed to write status stream");
2208                                 break;
2209                         }
2210
2211                         fclose(f);
2212                         log_dump(LOG_INFO, dump);
2213                         free(dump);
2214
2215                         break;
2216                 }
2217
2218                 case SIGHUP:
2219                         m->exit_code = MANAGER_RELOAD;
2220                         break;
2221
2222                 default: {
2223
2224                         /* Starting SIGRTMIN+0 */
2225                         static const char * const target_table[] = {
2226                                 [0] = SPECIAL_DEFAULT_TARGET,
2227                                 [1] = SPECIAL_RESCUE_TARGET,
2228                                 [2] = SPECIAL_EMERGENCY_TARGET,
2229                                 [3] = SPECIAL_HALT_TARGET,
2230                                 [4] = SPECIAL_POWEROFF_TARGET,
2231                                 [5] = SPECIAL_REBOOT_TARGET,
2232                                 [6] = SPECIAL_KEXEC_TARGET
2233                         };
2234
2235                         /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
2236                         static const ManagerExitCode code_table[] = {
2237                                 [0] = MANAGER_HALT,
2238                                 [1] = MANAGER_POWEROFF,
2239                                 [2] = MANAGER_REBOOT,
2240                                 [3] = MANAGER_KEXEC
2241                         };
2242
2243                         if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
2244                             (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
2245                                 int idx = (int) sfsi.ssi_signo - SIGRTMIN;
2246                                 manager_start_target(m, target_table[idx],
2247                                                      (idx == 1 || idx == 2) ? JOB_ISOLATE : JOB_REPLACE);
2248                                 break;
2249                         }
2250
2251                         if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
2252                             (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(code_table)) {
2253                                 m->exit_code = code_table[sfsi.ssi_signo - SIGRTMIN - 13];
2254                                 break;
2255                         }
2256
2257                         switch (sfsi.ssi_signo - SIGRTMIN) {
2258
2259                         case 20:
2260                                 log_debug("Enabling showing of status.");
2261                                 manager_set_show_status(m, true);
2262                                 break;
2263
2264                         case 21:
2265                                 log_debug("Disabling showing of status.");
2266                                 manager_set_show_status(m, false);
2267                                 break;
2268
2269                         case 22:
2270                                 log_set_max_level(LOG_DEBUG);
2271                                 log_notice("Setting log level to debug.");
2272                                 break;
2273
2274                         case 23:
2275                                 log_set_max_level(LOG_INFO);
2276                                 log_notice("Setting log level to info.");
2277                                 break;
2278
2279                         case 27:
2280                                 log_set_target(LOG_TARGET_CONSOLE);
2281                                 log_notice("Setting log target to console.");
2282                                 break;
2283
2284                         case 28:
2285                                 log_set_target(LOG_TARGET_KMSG);
2286                                 log_notice("Setting log target to kmsg.");
2287                                 break;
2288
2289                         case 29:
2290                                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
2291                                 log_notice("Setting log target to syslog-or-kmsg.");
2292                                 break;
2293
2294                         default:
2295                                 log_warning("Got unhandled signal <%s>.", signal_to_string(sfsi.ssi_signo));
2296                         }
2297                 }
2298                 }
2299         }
2300
2301         if (sigchld)
2302                 return manager_dispatch_sigchld(m);
2303
2304         return 0;
2305 }
2306
2307 static int process_event(Manager *m, struct epoll_event *ev) {
2308         int r;
2309         Watch *w;
2310
2311         assert(m);
2312         assert(ev);
2313
2314         assert_se(w = ev->data.ptr);
2315
2316         if (w->type == WATCH_INVALID)
2317                 return 0;
2318
2319         switch (w->type) {
2320
2321         case WATCH_SIGNAL:
2322
2323                 /* An incoming signal? */
2324                 if (ev->events != EPOLLIN)
2325                         return -EINVAL;
2326
2327                 if ((r = manager_process_signal_fd(m)) < 0)
2328                         return r;
2329
2330                 break;
2331
2332         case WATCH_NOTIFY:
2333
2334                 /* An incoming daemon notification event? */
2335                 if (ev->events != EPOLLIN)
2336                         return -EINVAL;
2337
2338                 if ((r = manager_process_notify_fd(m)) < 0)
2339                         return r;
2340
2341                 break;
2342
2343         case WATCH_FD:
2344
2345                 /* Some fd event, to be dispatched to the units */
2346                 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
2347                 break;
2348
2349         case WATCH_UNIT_TIMER:
2350         case WATCH_JOB_TIMER: {
2351                 uint64_t v;
2352                 ssize_t k;
2353
2354                 /* Some timer event, to be dispatched to the units */
2355                 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
2356
2357                         if (k < 0 && (errno == EINTR || errno == EAGAIN))
2358                                 break;
2359
2360                         return k < 0 ? -errno : -EIO;
2361                 }
2362
2363                 if (w->type == WATCH_UNIT_TIMER)
2364                         UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
2365                 else
2366                         job_timer_event(w->data.job, v, w);
2367                 break;
2368         }
2369
2370         case WATCH_MOUNT:
2371                 /* Some mount table change, intended for the mount subsystem */
2372                 mount_fd_event(m, ev->events);
2373                 break;
2374
2375         case WATCH_SWAP:
2376                 /* Some swap table change, intended for the swap subsystem */
2377                 swap_fd_event(m, ev->events);
2378                 break;
2379
2380         case WATCH_UDEV:
2381                 /* Some notification from udev, intended for the device subsystem */
2382                 device_fd_event(m, ev->events);
2383                 break;
2384
2385         case WATCH_DBUS_WATCH:
2386                 bus_watch_event(m, w, ev->events);
2387                 break;
2388
2389         case WATCH_DBUS_TIMEOUT:
2390                 bus_timeout_event(m, w, ev->events);
2391                 break;
2392
2393         default:
2394                 log_error("event type=%i", w->type);
2395                 assert_not_reached("Unknown epoll event type.");
2396         }
2397
2398         return 0;
2399 }
2400
2401 int manager_loop(Manager *m) {
2402         int r;
2403
2404         RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 50000);
2405
2406         assert(m);
2407         m->exit_code = MANAGER_RUNNING;
2408
2409         /* Release the path cache */
2410         set_free_free(m->unit_path_cache);
2411         m->unit_path_cache = NULL;
2412
2413         manager_check_finished(m);
2414
2415         /* There might still be some zombies hanging around from
2416          * before we were exec()'ed. Leat's reap them */
2417         if ((r = manager_dispatch_sigchld(m)) < 0)
2418                 return r;
2419
2420         while (m->exit_code == MANAGER_RUNNING) {
2421                 struct epoll_event event;
2422                 int n;
2423
2424                 if (!ratelimit_test(&rl)) {
2425                         /* Yay, something is going seriously wrong, pause a little */
2426                         log_warning("Looping too fast. Throttling execution a little.");
2427                         sleep(1);
2428                 }
2429
2430                 if (manager_dispatch_load_queue(m) > 0)
2431                         continue;
2432
2433                 if (manager_dispatch_run_queue(m) > 0)
2434                         continue;
2435
2436                 if (bus_dispatch(m) > 0)
2437                         continue;
2438
2439                 if (manager_dispatch_cleanup_queue(m) > 0)
2440                         continue;
2441
2442                 if (manager_dispatch_gc_queue(m) > 0)
2443                         continue;
2444
2445                 if (manager_dispatch_dbus_queue(m) > 0)
2446                         continue;
2447
2448                 if (swap_dispatch_reload(m) > 0)
2449                         continue;
2450
2451                 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2452
2453                         if (errno == EINTR)
2454                                 continue;
2455
2456                         return -errno;
2457                 }
2458
2459                 assert(n == 1);
2460
2461                 if ((r = process_event(m, &event)) < 0)
2462                         return r;
2463         }
2464
2465         return m->exit_code;
2466 }
2467
2468 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2469         char *n;
2470         Unit *u;
2471
2472         assert(m);
2473         assert(s);
2474         assert(_u);
2475
2476         if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2477                 return -EINVAL;
2478
2479         if (!(n = bus_path_unescape(s+31)))
2480                 return -ENOMEM;
2481
2482         u = manager_get_unit(m, n);
2483         free(n);
2484
2485         if (!u)
2486                 return -ENOENT;
2487
2488         *_u = u;
2489
2490         return 0;
2491 }
2492
2493 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2494         Job *j;
2495         unsigned id;
2496         int r;
2497
2498         assert(m);
2499         assert(s);
2500         assert(_j);
2501
2502         if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2503                 return -EINVAL;
2504
2505         if ((r = safe_atou(s + 30, &id)) < 0)
2506                 return r;
2507
2508         if (!(j = manager_get_job(m, id)))
2509                 return -ENOENT;
2510
2511         *_j = j;
2512
2513         return 0;
2514 }
2515
2516 void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
2517
2518 #ifdef HAVE_AUDIT
2519         char *p;
2520
2521         if (m->audit_fd < 0)
2522                 return;
2523
2524         /* Don't generate audit events if the service was already
2525          * started and we're just deserializing */
2526         if (m->n_reloading > 0)
2527                 return;
2528
2529         if (m->running_as != MANAGER_SYSTEM)
2530                 return;
2531
2532         if (u->meta.type != UNIT_SERVICE)
2533                 return;
2534
2535         if (!(p = unit_name_to_prefix_and_instance(u->meta.id))) {
2536                 log_error("Failed to allocate unit name for audit message: %s", strerror(ENOMEM));
2537                 return;
2538         }
2539
2540         if (audit_log_user_comm_message(m->audit_fd, type, "", p, NULL, NULL, NULL, success) < 0) {
2541                 log_warning("Failed to send audit message: %m");
2542
2543                 if (errno == EPERM) {
2544                         /* We aren't allowed to send audit messages?
2545                          * Then let's not retry again, to avoid
2546                          * spamming the user with the same and same
2547                          * messages over and over. */
2548
2549                         audit_close(m->audit_fd);
2550                         m->audit_fd = -1;
2551                 }
2552         }
2553
2554         free(p);
2555 #endif
2556
2557 }
2558
2559 void manager_send_unit_plymouth(Manager *m, Unit *u) {
2560         int fd = -1;
2561         union sockaddr_union sa;
2562         int n = 0;
2563         char *message = NULL;
2564
2565         /* Don't generate plymouth events if the service was already
2566          * started and we're just deserializing */
2567         if (m->n_reloading > 0)
2568                 return;
2569
2570         if (m->running_as != MANAGER_SYSTEM)
2571                 return;
2572
2573         if (u->meta.type != UNIT_SERVICE &&
2574             u->meta.type != UNIT_MOUNT &&
2575             u->meta.type != UNIT_SWAP)
2576                 return;
2577
2578         /* We set SOCK_NONBLOCK here so that we rather drop the
2579          * message then wait for plymouth */
2580         if ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
2581                 log_error("socket() failed: %m");
2582                 return;
2583         }
2584
2585         zero(sa);
2586         sa.sa.sa_family = AF_UNIX;
2587         strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
2588         if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
2589
2590                 if (errno != EPIPE &&
2591                     errno != EAGAIN &&
2592                     errno != ENOENT &&
2593                     errno != ECONNREFUSED &&
2594                     errno != ECONNRESET &&
2595                     errno != ECONNABORTED)
2596                         log_error("connect() failed: %m");
2597
2598                 goto finish;
2599         }
2600
2601         if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->meta.id) + 1), u->meta.id, &n) < 0) {
2602                 log_error("Out of memory");
2603                 goto finish;
2604         }
2605
2606         errno = 0;
2607         if (write(fd, message, n + 1) != n + 1) {
2608
2609                 if (errno != EPIPE &&
2610                     errno != EAGAIN &&
2611                     errno != ENOENT &&
2612                     errno != ECONNREFUSED &&
2613                     errno != ECONNRESET &&
2614                     errno != ECONNABORTED)
2615                         log_error("Failed to write Plymouth message: %m");
2616
2617                 goto finish;
2618         }
2619
2620 finish:
2621         if (fd >= 0)
2622                 close_nointr_nofail(fd);
2623
2624         free(message);
2625 }
2626
2627 void manager_dispatch_bus_name_owner_changed(
2628                 Manager *m,
2629                 const char *name,
2630                 const char* old_owner,
2631                 const char *new_owner) {
2632
2633         Unit *u;
2634
2635         assert(m);
2636         assert(name);
2637
2638         if (!(u = hashmap_get(m->watch_bus, name)))
2639                 return;
2640
2641         UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2642 }
2643
2644 void manager_dispatch_bus_query_pid_done(
2645                 Manager *m,
2646                 const char *name,
2647                 pid_t pid) {
2648
2649         Unit *u;
2650
2651         assert(m);
2652         assert(name);
2653         assert(pid >= 1);
2654
2655         if (!(u = hashmap_get(m->watch_bus, name)))
2656                 return;
2657
2658         UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2659 }
2660
2661 int manager_open_serialization(Manager *m, FILE **_f) {
2662         char *path = NULL;
2663         mode_t saved_umask;
2664         int fd;
2665         FILE *f;
2666
2667         assert(_f);
2668
2669         if (m->running_as == MANAGER_SYSTEM)
2670                 asprintf(&path, "/run/systemd/dump-%lu-XXXXXX", (unsigned long) getpid());
2671         else
2672                 asprintf(&path, "/tmp/systemd-dump-%lu-XXXXXX", (unsigned long) getpid());
2673
2674         if (!path)
2675                 return -ENOMEM;
2676
2677         saved_umask = umask(0077);
2678         fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2679         umask(saved_umask);
2680
2681         if (fd < 0) {
2682                 free(path);
2683                 return -errno;
2684         }
2685
2686         unlink(path);
2687
2688         log_debug("Serializing state to %s", path);
2689         free(path);
2690
2691         if (!(f = fdopen(fd, "w+")))
2692                 return -errno;
2693
2694         *_f = f;
2695
2696         return 0;
2697 }
2698
2699 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2700         Iterator i;
2701         Unit *u;
2702         const char *t;
2703         int r;
2704
2705         assert(m);
2706         assert(f);
2707         assert(fds);
2708
2709         m->n_reloading ++;
2710
2711         fprintf(f, "current-job-id=%i\n", m->current_job_id);
2712         fprintf(f, "taint-usr=%s\n", yes_no(m->taint_usr));
2713
2714         dual_timestamp_serialize(f, "initrd-timestamp", &m->initrd_timestamp);
2715         dual_timestamp_serialize(f, "startup-timestamp", &m->startup_timestamp);
2716         dual_timestamp_serialize(f, "finish-timestamp", &m->finish_timestamp);
2717
2718         fputc('\n', f);
2719
2720         HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2721                 if (u->meta.id != t)
2722                         continue;
2723
2724                 if (!unit_can_serialize(u))
2725                         continue;
2726
2727                 /* Start marker */
2728                 fputs(u->meta.id, f);
2729                 fputc('\n', f);
2730
2731                 if ((r = unit_serialize(u, f, fds)) < 0) {
2732                         m->n_reloading --;
2733                         return r;
2734                 }
2735         }
2736
2737         assert(m->n_reloading > 0);
2738         m->n_reloading --;
2739
2740         if (ferror(f))
2741                 return -EIO;
2742
2743         r = bus_fdset_add_all(m, fds);
2744         if (r < 0)
2745                 return r;
2746
2747         return 0;
2748 }
2749
2750 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2751         int r = 0;
2752
2753         assert(m);
2754         assert(f);
2755
2756         log_debug("Deserializing state...");
2757
2758         m->n_reloading ++;
2759
2760         for (;;) {
2761                 char line[LINE_MAX], *l;
2762
2763                 if (!fgets(line, sizeof(line), f)) {
2764                         if (feof(f))
2765                                 r = 0;
2766                         else
2767                                 r = -errno;
2768
2769                         goto finish;
2770                 }
2771
2772                 char_array_0(line);
2773                 l = strstrip(line);
2774
2775                 if (l[0] == 0)
2776                         break;
2777
2778                 if (startswith(l, "current-job-id=")) {
2779                         uint32_t id;
2780
2781                         if (safe_atou32(l+15, &id) < 0)
2782                                 log_debug("Failed to parse current job id value %s", l+15);
2783                         else
2784                                 m->current_job_id = MAX(m->current_job_id, id);
2785                 } else if (startswith(l, "taint-usr=")) {
2786                         int b;
2787
2788                         if ((b = parse_boolean(l+10)) < 0)
2789                                 log_debug("Failed to parse taint /usr flag %s", l+10);
2790                         else
2791                                 m->taint_usr = m->taint_usr || b;
2792                 } else if (startswith(l, "initrd-timestamp="))
2793                         dual_timestamp_deserialize(l+17, &m->initrd_timestamp);
2794                 else if (startswith(l, "startup-timestamp="))
2795                         dual_timestamp_deserialize(l+18, &m->startup_timestamp);
2796                 else if (startswith(l, "finish-timestamp="))
2797                         dual_timestamp_deserialize(l+17, &m->finish_timestamp);
2798                 else
2799                         log_debug("Unknown serialization item '%s'", l);
2800         }
2801
2802         for (;;) {
2803                 Unit *u;
2804                 char name[UNIT_NAME_MAX+2];
2805
2806                 /* Start marker */
2807                 if (!fgets(name, sizeof(name), f)) {
2808                         if (feof(f))
2809                                 r = 0;
2810                         else
2811                                 r = -errno;
2812
2813                         goto finish;
2814                 }
2815
2816                 char_array_0(name);
2817
2818                 if ((r = manager_load_unit(m, strstrip(name), NULL, NULL, &u)) < 0)
2819                         goto finish;
2820
2821                 if ((r = unit_deserialize(u, f, fds)) < 0)
2822                         goto finish;
2823         }
2824
2825 finish:
2826         if (ferror(f)) {
2827                 r = -EIO;
2828                 goto finish;
2829         }
2830
2831         assert(m->n_reloading > 0);
2832         m->n_reloading --;
2833
2834         return r;
2835 }
2836
2837 int manager_reload(Manager *m) {
2838         int r, q;
2839         FILE *f;
2840         FDSet *fds;
2841
2842         assert(m);
2843
2844         if ((r = manager_open_serialization(m, &f)) < 0)
2845                 return r;
2846
2847         m->n_reloading ++;
2848
2849         if (!(fds = fdset_new())) {
2850                 m->n_reloading --;
2851                 r = -ENOMEM;
2852                 goto finish;
2853         }
2854
2855         if ((r = manager_serialize(m, f, fds)) < 0) {
2856                 m->n_reloading --;
2857                 goto finish;
2858         }
2859
2860         if (fseeko(f, 0, SEEK_SET) < 0) {
2861                 m->n_reloading --;
2862                 r = -errno;
2863                 goto finish;
2864         }
2865
2866         /* From here on there is no way back. */
2867         manager_clear_jobs_and_units(m);
2868         manager_undo_generators(m);
2869
2870         /* Find new unit paths */
2871         lookup_paths_free(&m->lookup_paths);
2872         if ((q = lookup_paths_init(&m->lookup_paths, m->running_as, true)) < 0)
2873                 r = q;
2874
2875         manager_run_generators(m);
2876
2877         manager_build_unit_path_cache(m);
2878
2879         /* First, enumerate what we can from all config files */
2880         if ((q = manager_enumerate(m)) < 0)
2881                 r = q;
2882
2883         /* Second, deserialize our stored data */
2884         if ((q = manager_deserialize(m, f, fds)) < 0)
2885                 r = q;
2886
2887         fclose(f);
2888         f = NULL;
2889
2890         /* Third, fire things up! */
2891         if ((q = manager_coldplug(m)) < 0)
2892                 r = q;
2893
2894         assert(m->n_reloading > 0);
2895         m->n_reloading--;
2896
2897 finish:
2898         if (f)
2899                 fclose(f);
2900
2901         if (fds)
2902                 fdset_free(fds);
2903
2904         return r;
2905 }
2906
2907 bool manager_is_booting_or_shutting_down(Manager *m) {
2908         Unit *u;
2909
2910         assert(m);
2911
2912         /* Is the initial job still around? */
2913         if (manager_get_job(m, 1))
2914                 return true;
2915
2916         /* Is there a job for the shutdown target? */
2917         u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET);
2918         if (u)
2919                 return !!u->meta.job;
2920
2921         return false;
2922 }
2923
2924 void manager_reset_failed(Manager *m) {
2925         Unit *u;
2926         Iterator i;
2927
2928         assert(m);
2929
2930         HASHMAP_FOREACH(u, m->units, i)
2931                 unit_reset_failed(u);
2932 }
2933
2934 bool manager_unit_pending_inactive(Manager *m, const char *name) {
2935         Unit *u;
2936
2937         assert(m);
2938         assert(name);
2939
2940         /* Returns true if the unit is inactive or going down */
2941         if (!(u = manager_get_unit(m, name)))
2942                 return true;
2943
2944         return unit_pending_inactive(u);
2945 }
2946
2947 void manager_check_finished(Manager *m) {
2948         char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX];
2949         usec_t kernel_usec = 0, initrd_usec = 0, userspace_usec = 0, total_usec = 0;
2950
2951         assert(m);
2952
2953         if (dual_timestamp_is_set(&m->finish_timestamp))
2954                 return;
2955
2956         if (hashmap_size(m->jobs) > 0)
2957                 return;
2958
2959         dual_timestamp_get(&m->finish_timestamp);
2960
2961         if (m->running_as == MANAGER_SYSTEM && detect_container(NULL) <= 0) {
2962
2963                 userspace_usec = m->finish_timestamp.monotonic - m->startup_timestamp.monotonic;
2964                 total_usec = m->finish_timestamp.monotonic;
2965
2966                 if (dual_timestamp_is_set(&m->initrd_timestamp)) {
2967
2968                         kernel_usec = m->initrd_timestamp.monotonic;
2969                         initrd_usec = m->startup_timestamp.monotonic - m->initrd_timestamp.monotonic;
2970
2971                         log_info("Startup finished in %s (kernel) + %s (initrd) + %s (userspace) = %s.",
2972                                  format_timespan(kernel, sizeof(kernel), kernel_usec),
2973                                  format_timespan(initrd, sizeof(initrd), initrd_usec),
2974                                  format_timespan(userspace, sizeof(userspace), userspace_usec),
2975                                  format_timespan(sum, sizeof(sum), total_usec));
2976                 } else {
2977                         kernel_usec = m->startup_timestamp.monotonic;
2978                         initrd_usec = 0;
2979
2980                         log_info("Startup finished in %s (kernel) + %s (userspace) = %s.",
2981                                  format_timespan(kernel, sizeof(kernel), kernel_usec),
2982                                  format_timespan(userspace, sizeof(userspace), userspace_usec),
2983                                  format_timespan(sum, sizeof(sum), total_usec));
2984                 }
2985         } else {
2986                 userspace_usec = initrd_usec = kernel_usec = 0;
2987                 total_usec = m->finish_timestamp.monotonic - m->startup_timestamp.monotonic;
2988
2989                 log_debug("Startup finished in %s.",
2990                           format_timespan(sum, sizeof(sum), total_usec));
2991         }
2992
2993         bus_broadcast_finished(m, kernel_usec, initrd_usec, userspace_usec, total_usec);
2994
2995         sd_notifyf(false,
2996                    "READY=1\nSTATUS=Startup finished in %s.",
2997                    format_timespan(sum, sizeof(sum), total_usec));
2998 }
2999
3000 void manager_run_generators(Manager *m) {
3001         DIR *d = NULL;
3002         const char *generator_path;
3003         const char *argv[3];
3004         mode_t u;
3005
3006         assert(m);
3007
3008         generator_path = m->running_as == MANAGER_SYSTEM ? SYSTEM_GENERATOR_PATH : USER_GENERATOR_PATH;
3009         if (!(d = opendir(generator_path))) {
3010
3011                 if (errno == ENOENT)
3012                         return;
3013
3014                 log_error("Failed to enumerate generator directory: %m");
3015                 return;
3016         }
3017
3018         if (!m->generator_unit_path) {
3019                 const char *p;
3020                 char user_path[] = "/tmp/systemd-generator-XXXXXX";
3021
3022                 if (m->running_as == MANAGER_SYSTEM && getpid() == 1) {
3023                         p = "/run/systemd/generator";
3024
3025                         if (mkdir_p(p, 0755) < 0) {
3026                                 log_error("Failed to create generator directory: %m");
3027                                 goto finish;
3028                         }
3029
3030                 } else {
3031                         if (!(p = mkdtemp(user_path))) {
3032                                 log_error("Failed to create generator directory: %m");
3033                                 goto finish;
3034                         }
3035                 }
3036
3037                 if (!(m->generator_unit_path = strdup(p))) {
3038                         log_error("Failed to allocate generator unit path.");
3039                         goto finish;
3040                 }
3041         }
3042
3043         argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */
3044         argv[1] = m->generator_unit_path;
3045         argv[2] = NULL;
3046
3047         u = umask(0022);
3048         execute_directory(generator_path, d, (char**) argv);
3049         umask(u);
3050
3051         if (rmdir(m->generator_unit_path) >= 0) {
3052                 /* Uh? we were able to remove this dir? I guess that
3053                  * means the directory was empty, hence let's shortcut
3054                  * this */
3055
3056                 free(m->generator_unit_path);
3057                 m->generator_unit_path = NULL;
3058                 goto finish;
3059         }
3060
3061         if (!strv_find(m->lookup_paths.unit_path, m->generator_unit_path)) {
3062                 char **l;
3063
3064                 if (!(l = strv_append(m->lookup_paths.unit_path, m->generator_unit_path))) {
3065                         log_error("Failed to add generator directory to unit search path: %m");
3066                         goto finish;
3067                 }
3068
3069                 strv_free(m->lookup_paths.unit_path);
3070                 m->lookup_paths.unit_path = l;
3071
3072                 log_debug("Added generator unit path %s to search path.", m->generator_unit_path);
3073         }
3074
3075 finish:
3076         if (d)
3077                 closedir(d);
3078 }
3079
3080 void manager_undo_generators(Manager *m) {
3081         assert(m);
3082
3083         if (!m->generator_unit_path)
3084                 return;
3085
3086         strv_remove(m->lookup_paths.unit_path, m->generator_unit_path);
3087         rm_rf(m->generator_unit_path, false, true, false);
3088
3089         free(m->generator_unit_path);
3090         m->generator_unit_path = NULL;
3091 }
3092
3093 int manager_set_default_controllers(Manager *m, char **controllers) {
3094         char **l;
3095
3096         assert(m);
3097
3098         if (!(l = strv_copy(controllers)))
3099                 return -ENOMEM;
3100
3101         strv_free(m->default_controllers);
3102         m->default_controllers = l;
3103
3104         return 0;
3105 }
3106
3107 void manager_recheck_syslog(Manager *m) {
3108         Unit *u;
3109
3110         assert(m);
3111
3112         if (m->running_as != MANAGER_SYSTEM)
3113                 return;
3114
3115         if ((u = manager_get_unit(m, SPECIAL_SYSLOG_SOCKET))) {
3116                 SocketState state;
3117
3118                 state = SOCKET(u)->state;
3119
3120                 if (state != SOCKET_DEAD &&
3121                     state != SOCKET_FAILED &&
3122                     state != SOCKET_RUNNING) {
3123
3124                         /* Hmm, the socket is not set up, or is still
3125                          * listening, let's better not try to use
3126                          * it. Note that we have no problem if the
3127                          * socket is completely down, since there
3128                          * might be a foreign /dev/log socket around
3129                          * and we want to make use of that.
3130                          */
3131
3132                         log_close_syslog();
3133                         return;
3134                 }
3135         }
3136
3137         if ((u = manager_get_unit(m, SPECIAL_SYSLOG_TARGET)))
3138                 if (TARGET(u)->state != TARGET_ACTIVE) {
3139                         log_close_syslog();
3140                         return;
3141                 }
3142
3143         /* Hmm, OK, so the socket is either fully up, or fully down,
3144          * and the target is up, then let's make use of the socket */
3145         log_open();
3146 }
3147
3148 void manager_set_show_status(Manager *m, bool b) {
3149         assert(m);
3150
3151         if (m->running_as != MANAGER_SYSTEM)
3152                 return;
3153
3154         m->show_status = b;
3155
3156         if (b)
3157                 touch("/run/systemd/show-status");
3158         else
3159                 unlink("/run/systemd/show-status");
3160 }
3161
3162 bool manager_get_show_status(Manager *m) {
3163         assert(m);
3164
3165         if (m->running_as != MANAGER_SYSTEM)
3166                 return false;
3167
3168         if (m->show_status)
3169                 return true;
3170
3171         /* If Plymouth is running make sure we show the status, so
3172          * that there's something nice to see when people press Esc */
3173
3174         return plymouth_running();
3175 }
3176
3177 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
3178         [MANAGER_SYSTEM] = "system",
3179         [MANAGER_USER] = "user"
3180 };
3181
3182 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);