src/manager.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <assert.h>
  23 #include <errno.h>
  24 #include <string.h>
  25 #include <sys/epoll.h>
  26 #include <signal.h>
  27 #include <sys/signalfd.h>
  28 #include <sys/wait.h>
  29 #include <unistd.h>
  30 #include <sys/poll.h>
  31 #include <sys/reboot.h>
  32 #include <sys/ioctl.h>
  33 #include <linux/kd.h>
  34 #include <termios.h>
  35 #include <fcntl.h>
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 #include <dirent.h>
  39
  40 #ifdef HAVE_AUDIT
  41 #include <libaudit.h>
  42 #endif
  43
  44 #include "manager.h"
  45 #include "hashmap.h"
  46 #include "macro.h"
  47 #include "strv.h"
  48 #include "log.h"
  49 #include "util.h"
  50 #include "ratelimit.h"
  51 #include "cgroup.h"
  52 #include "mount-setup.h"
  53 #include "unit-name.h"
  54 #include "dbus-unit.h"
  55 #include "dbus-job.h"
  56 #include "missing.h"
  57 #include "path-lookup.h"
  58 #include "special.h"
  59 #include "bus-errors.h"
  60 #include "exit-status.h"
  61 #include "sd-daemon.h"
  62
  63 /* As soon as 16 units are in our GC queue, make sure to run a gc sweep */
  64 #define GC_QUEUE_ENTRIES_MAX 16
  65
  66 /* As soon as 5s passed since a unit was added to our GC queue, make sure to run a gc sweep */
  67 #define GC_QUEUE_USEC_MAX (10*USEC_PER_SEC)
  68
  69 /* Where clients shall send notification messages to */
  70 #define NOTIFY_SOCKET_SYSTEM "/run/systemd/notify"
  71 #define NOTIFY_SOCKET_USER "@/org/freedesktop/systemd1/notify"
  72
  73 static int manager_setup_notify(Manager *m) {
  74         union {
  75                 struct sockaddr sa;
  76                 struct sockaddr_un un;
  77         } sa;
  78         struct epoll_event ev;
  79         int one = 1;
  80
  81         assert(m);
  82
  83         m->notify_watch.type = WATCH_NOTIFY;
  84         if ((m->notify_watch.fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
  85                 log_error("Failed to allocate notification socket: %m");
  86                 return -errno;
  87         }
  88
  89         zero(sa);
  90         sa.sa.sa_family = AF_UNIX;
  91
  92         if (getpid() != 1)
  93                 snprintf(sa.un.sun_path, sizeof(sa.un.sun_path), NOTIFY_SOCKET_USER "/%llu", random_ull());
  94         else {
  95                 unlink(NOTIFY_SOCKET_SYSTEM);
  96                 strncpy(sa.un.sun_path, NOTIFY_SOCKET_SYSTEM, sizeof(sa.un.sun_path));
  97         }
  98
  99         if (sa.un.sun_path[0] == '@')
 100                 sa.un.sun_path[0] = 0;
 101
 102         if (bind(m->notify_watch.fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
 103                 log_error("bind() failed: %m");
 104                 return -errno;
 105         }
 106
 107         if (setsockopt(m->notify_watch.fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
 108                 log_error("SO_PASSCRED failed: %m");
 109                 return -errno;
 110         }
 111
 112         zero(ev);
 113         ev.events = EPOLLIN;
 114         ev.data.ptr = &m->notify_watch;
 115
 116         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->notify_watch.fd, &ev) < 0)
 117                 return -errno;
 118
 119         if (sa.un.sun_path[0] == 0)
 120                 sa.un.sun_path[0] = '@';
 121
 122         if (!(m->notify_socket = strdup(sa.un.sun_path)))
 123                 return -ENOMEM;
 124
 125         log_debug("Using notification socket %s", m->notify_socket);
 126
 127         return 0;
 128 }
 129
 130 static int enable_special_signals(Manager *m) {
 131         int fd;
 132
 133         assert(m);
 134
 135         /* Enable that we get SIGINT on control-alt-del */
 136         if (reboot(RB_DISABLE_CAD) < 0)
 137                 log_warning("Failed to enable ctrl-alt-del handling: %m");
 138
 139         if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0)
 140                 log_warning("Failed to open /dev/tty0: %m");
 141         else {
 142                 /* Enable that we get SIGWINCH on kbrequest */
 143                 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
 144                         log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
 145
 146                 close_nointr_nofail(fd);
 147         }
 148
 149         return 0;
 150 }
 151
 152 static int manager_setup_signals(Manager *m) {
 153         sigset_t mask;
 154         struct epoll_event ev;
 155         struct sigaction sa;
 156
 157         assert(m);
 158
 159         /* We are not interested in SIGSTOP and friends. */
 160         zero(sa);
 161         sa.sa_handler = SIG_DFL;
 162         sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
 163         assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 164
 165         assert_se(sigemptyset(&mask) == 0);
 166
 167         sigset_add_many(&mask,
 168                         SIGCHLD,     /* Child died */
 169                         SIGTERM,     /* Reexecute daemon */
 170                         SIGHUP,      /* Reload configuration */
 171                         SIGUSR1,     /* systemd/upstart: reconnect to D-Bus */
 172                         SIGUSR2,     /* systemd: dump status */
 173                         SIGINT,      /* Kernel sends us this on control-alt-del */
 174                         SIGWINCH,    /* Kernel sends us this on kbrequest (alt-arrowup) */
 175                         SIGPWR,      /* Some kernel drivers and upsd send us this on power failure */
 176                         SIGRTMIN+0,  /* systemd: start default.target */
 177                         SIGRTMIN+1,  /* systemd: isolate rescue.target */
 178                         SIGRTMIN+2,  /* systemd: isolate emergency.target */
 179                         SIGRTMIN+3,  /* systemd: start halt.target */
 180                         SIGRTMIN+4,  /* systemd: start poweroff.target */
 181                         SIGRTMIN+5,  /* systemd: start reboot.target */
 182                         SIGRTMIN+6,  /* systemd: start kexec.target */
 183                         SIGRTMIN+13, /* systemd: Immediate halt */
 184                         SIGRTMIN+14, /* systemd: Immediate poweroff */
 185                         SIGRTMIN+15, /* systemd: Immediate reboot */
 186                         SIGRTMIN+16, /* systemd: Immediate kexec */
 187                         SIGRTMIN+20, /* systemd: enable status messages */
 188                         SIGRTMIN+21, /* systemd: disable status messages */
 189                         SIGRTMIN+22, /* systemd: set log level to LOG_DEBUG */
 190                         SIGRTMIN+23, /* systemd: set log level to LOG_INFO */
 191                         SIGRTMIN+27, /* systemd: set log target to console */
 192                         SIGRTMIN+28, /* systemd: set log target to kmsg */
 193                         SIGRTMIN+29, /* systemd: set log target to syslog-or-kmsg */
 194                         -1);
 195         assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
 196
 197         m->signal_watch.type = WATCH_SIGNAL;
 198         if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
 199                 return -errno;
 200
 201         zero(ev);
 202         ev.events = EPOLLIN;
 203         ev.data.ptr = &m->signal_watch;
 204
 205         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
 206                 return -errno;
 207
 208         if (m->running_as == MANAGER_SYSTEM)
 209                 return enable_special_signals(m);
 210
 211         return 0;
 212 }
 213
 214 int manager_new(ManagerRunningAs running_as, Manager **_m) {
 215         Manager *m;
 216         int r = -ENOMEM;
 217
 218         assert(_m);
 219         assert(running_as >= 0);
 220         assert(running_as < _MANAGER_RUNNING_AS_MAX);
 221
 222         if (!(m = new0(Manager, 1)))
 223                 return -ENOMEM;
 224
 225         dual_timestamp_get(&m->startup_timestamp);
 226
 227         m->running_as = running_as;
 228         m->name_data_slot = m->subscribed_data_slot = -1;
 229         m->exit_code = _MANAGER_EXIT_CODE_INVALID;
 230         m->pin_cgroupfs_fd = -1;
 231
 232 #ifdef HAVE_AUDIT
 233         m->audit_fd = -1;
 234 #endif
 235
 236         m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_fd = m->swap_watch.fd = -1;
 237         m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
 238
 239         if (!(m->environment = strv_copy(environ)))
 240                 goto fail;
 241
 242         if (!(m->default_controllers = strv_new("cpu", NULL)))
 243                 goto fail;
 244
 245         if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
 246                 goto fail;
 247
 248         if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
 249                 goto fail;
 250
 251         if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func)))
 252                 goto fail;
 253
 254         if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
 255                 goto fail;
 256
 257         if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
 258                 goto fail;
 259
 260         if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
 261                 goto fail;
 262
 263         if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
 264                 goto fail;
 265
 266         if ((r = lookup_paths_init(&m->lookup_paths, m->running_as, true)) < 0)
 267                 goto fail;
 268
 269         if ((r = manager_setup_signals(m)) < 0)
 270                 goto fail;
 271
 272         if ((r = manager_setup_cgroup(m)) < 0)
 273                 goto fail;
 274
 275         if ((r = manager_setup_notify(m)) < 0)
 276                 goto fail;
 277
 278         /* Try to connect to the busses, if possible. */
 279         if ((r = bus_init(m, running_as != MANAGER_SYSTEM)) < 0)
 280                 goto fail;
 281
 282 #ifdef HAVE_AUDIT
 283         if ((m->audit_fd = audit_open()) < 0)
 284                 log_error("Failed to connect to audit log: %m");
 285 #endif
 286
 287         m->taint_usr = dir_is_empty("/usr") > 0;
 288
 289         *_m = m;
 290         return 0;
 291
 292 fail:
 293         manager_free(m);
 294         return r;
 295 }
 296
 297 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
 298         Meta *meta;
 299         unsigned n = 0;
 300
 301         assert(m);
 302
 303         while ((meta = m->cleanup_queue)) {
 304                 assert(meta->in_cleanup_queue);
 305
 306                 unit_free((Unit*) meta);
 307                 n++;
 308         }
 309
 310         return n;
 311 }
 312
 313 enum {
 314         GC_OFFSET_IN_PATH,  /* This one is on the path we were traveling */
 315         GC_OFFSET_UNSURE,   /* No clue */
 316         GC_OFFSET_GOOD,     /* We still need this unit */
 317         GC_OFFSET_BAD,      /* We don't need this unit anymore */
 318         _GC_OFFSET_MAX
 319 };
 320
 321 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
 322         Iterator i;
 323         Unit *other;
 324         bool is_bad;
 325
 326         assert(u);
 327
 328         if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
 329             u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
 330             u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
 331                 return;
 332
 333         if (u->meta.in_cleanup_queue)
 334                 goto bad;
 335
 336         if (unit_check_gc(u))
 337                 goto good;
 338
 339         u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
 340
 341         is_bad = true;
 342
 343         SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
 344                 unit_gc_sweep(other, gc_marker);
 345
 346                 if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
 347                         goto good;
 348
 349                 if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
 350                         is_bad = false;
 351         }
 352
 353         if (is_bad)
 354                 goto bad;
 355
 356         /* We were unable to find anything out about this entry, so
 357          * let's investigate it later */
 358         u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
 359         unit_add_to_gc_queue(u);
 360         return;
 361
 362 bad:
 363         /* We definitely know that this one is not useful anymore, so
 364          * let's mark it for deletion */
 365         u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
 366         unit_add_to_cleanup_queue(u);
 367         return;
 368
 369 good:
 370         u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
 371 }
 372
 373 static unsigned manager_dispatch_gc_queue(Manager *m) {
 374         Meta *meta;
 375         unsigned n = 0;
 376         unsigned gc_marker;
 377
 378         assert(m);
 379
 380         if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
 381             (m->gc_queue_timestamp <= 0 ||
 382              (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
 383                 return 0;
 384
 385         log_debug("Running GC...");
 386
 387         m->gc_marker += _GC_OFFSET_MAX;
 388         if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
 389                 m->gc_marker = 1;
 390
 391         gc_marker = m->gc_marker;
 392
 393         while ((meta = m->gc_queue)) {
 394                 assert(meta->in_gc_queue);
 395
 396                 unit_gc_sweep((Unit*) meta, gc_marker);
 397
 398                 LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
 399                 meta->in_gc_queue = false;
 400
 401                 n++;
 402
 403                 if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
 404                     meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
 405                         log_debug("Collecting %s", meta->id);
 406                         meta->gc_marker = gc_marker + GC_OFFSET_BAD;
 407                         unit_add_to_cleanup_queue((Unit*) meta);
 408                 }
 409         }
 410
 411         m->n_in_gc_queue = 0;
 412         m->gc_queue_timestamp = 0;
 413
 414         return n;
 415 }
 416
 417 static void manager_clear_jobs_and_units(Manager *m) {
 418         Job *j;
 419         Unit *u;
 420
 421         assert(m);
 422
 423         while ((j = hashmap_first(m->transaction_jobs)))
 424                 job_free(j);
 425
 426         while ((u = hashmap_first(m->units)))
 427                 unit_free(u);
 428
 429         manager_dispatch_cleanup_queue(m);
 430
 431         assert(!m->load_queue);
 432         assert(!m->run_queue);
 433         assert(!m->dbus_unit_queue);
 434         assert(!m->dbus_job_queue);
 435         assert(!m->cleanup_queue);
 436         assert(!m->gc_queue);
 437
 438         assert(hashmap_isempty(m->transaction_jobs));
 439         assert(hashmap_isempty(m->jobs));
 440         assert(hashmap_isempty(m->units));
 441 }
 442
 443 void manager_free(Manager *m) {
 444         UnitType c;
 445
 446         assert(m);
 447
 448         manager_clear_jobs_and_units(m);
 449
 450         for (c = 0; c < _UNIT_TYPE_MAX; c++)
 451                 if (unit_vtable[c]->shutdown)
 452                         unit_vtable[c]->shutdown(m);
 453
 454         /* If we reexecute ourselves, we keep the root cgroup
 455          * around */
 456         manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
 457
 458         manager_undo_generators(m);
 459
 460         bus_done(m);
 461
 462         hashmap_free(m->units);
 463         hashmap_free(m->jobs);
 464         hashmap_free(m->transaction_jobs);
 465         hashmap_free(m->watch_pids);
 466         hashmap_free(m->watch_bus);
 467
 468         if (m->epoll_fd >= 0)
 469                 close_nointr_nofail(m->epoll_fd);
 470         if (m->signal_watch.fd >= 0)
 471                 close_nointr_nofail(m->signal_watch.fd);
 472         if (m->notify_watch.fd >= 0)
 473                 close_nointr_nofail(m->notify_watch.fd);
 474
 475 #ifdef HAVE_AUDIT
 476         if (m->audit_fd >= 0)
 477                 audit_close(m->audit_fd);
 478 #endif
 479
 480         free(m->notify_socket);
 481
 482         lookup_paths_free(&m->lookup_paths);
 483         strv_free(m->environment);
 484
 485         strv_free(m->default_controllers);
 486
 487         hashmap_free(m->cgroup_bondings);
 488         set_free_free(m->unit_path_cache);
 489
 490         free(m);
 491 }
 492
 493 int manager_enumerate(Manager *m) {
 494         int r = 0, q;
 495         UnitType c;
 496
 497         assert(m);
 498
 499         /* Let's ask every type to load all units from disk/kernel
 500          * that it might know */
 501         for (c = 0; c < _UNIT_TYPE_MAX; c++)
 502                 if (unit_vtable[c]->enumerate)
 503                         if ((q = unit_vtable[c]->enumerate(m)) < 0)
 504                                 r = q;
 505
 506         manager_dispatch_load_queue(m);
 507         return r;
 508 }
 509
 510 int manager_coldplug(Manager *m) {
 511         int r = 0, q;
 512         Iterator i;
 513         Unit *u;
 514         char *k;
 515
 516         assert(m);
 517
 518         /* Then, let's set up their initial state. */
 519         HASHMAP_FOREACH_KEY(u, k, m->units, i) {
 520
 521                 /* ignore aliases */
 522                 if (u->meta.id != k)
 523                         continue;
 524
 525                 if ((q = unit_coldplug(u)) < 0)
 526                         r = q;
 527         }
 528
 529         return r;
 530 }
 531
 532 static void manager_build_unit_path_cache(Manager *m) {
 533         char **i;
 534         DIR *d = NULL;
 535         int r;
 536
 537         assert(m);
 538
 539         set_free_free(m->unit_path_cache);
 540
 541         if (!(m->unit_path_cache = set_new(string_hash_func, string_compare_func))) {
 542                 log_error("Failed to allocate unit path cache.");
 543                 return;
 544         }
 545
 546         /* This simply builds a list of files we know exist, so that
 547          * we don't always have to go to disk */
 548
 549         STRV_FOREACH(i, m->lookup_paths.unit_path) {
 550                 struct dirent *de;
 551
 552                 if (!(d = opendir(*i))) {
 553                         log_error("Failed to open directory: %m");
 554                         continue;
 555                 }
 556
 557                 while ((de = readdir(d))) {
 558                         char *p;
 559
 560                         if (ignore_file(de->d_name))
 561                                 continue;
 562
 563                         if (asprintf(&p, "%s/%s", streq(*i, "/") ? "" : *i, de->d_name) < 0) {
 564                                 r = -ENOMEM;
 565                                 goto fail;
 566                         }
 567
 568                         if ((r = set_put(m->unit_path_cache, p)) < 0) {
 569                                 free(p);
 570                                 goto fail;
 571                         }
 572                 }
 573
 574                 closedir(d);
 575                 d = NULL;
 576         }
 577
 578         return;
 579
 580 fail:
 581         log_error("Failed to build unit path cache: %s", strerror(-r));
 582
 583         set_free_free(m->unit_path_cache);
 584         m->unit_path_cache = NULL;
 585
 586         if (d)
 587                 closedir(d);
 588 }
 589
 590 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
 591         int r, q;
 592
 593         assert(m);
 594
 595         manager_run_generators(m);
 596
 597         manager_build_unit_path_cache(m);
 598
 599         /* If we will deserialize make sure that during enumeration
 600          * this is already known, so we increase the counter here
 601          * already */
 602         if (serialization)
 603                 m->n_reloading ++;
 604
 605         /* First, enumerate what we can from all config files */
 606         r = manager_enumerate(m);
 607
 608         /* Second, deserialize if there is something to deserialize */
 609         if (serialization)
 610                 if ((q = manager_deserialize(m, serialization, fds)) < 0)
 611                         r = q;
 612
 613         /* Third, fire things up! */
 614         if ((q = manager_coldplug(m)) < 0)
 615                 r = q;
 616
 617         if (serialization) {
 618                 assert(m->n_reloading > 0);
 619                 m->n_reloading --;
 620         }
 621
 622         return r;
 623 }
 624
 625 static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
 626         assert(m);
 627         assert(j);
 628
 629         /* Deletes one job from the transaction */
 630
 631         manager_transaction_unlink_job(m, j, delete_dependencies);
 632
 633         if (!j->installed)
 634                 job_free(j);
 635 }
 636
 637 static void transaction_delete_unit(Manager *m, Unit *u) {
 638         Job *j;
 639
 640         /* Deletes all jobs associated with a certain unit from the
 641          * transaction */
 642
 643         while ((j = hashmap_get(m->transaction_jobs, u)))
 644                 transaction_delete_job(m, j, true);
 645 }
 646
 647 static void transaction_clean_dependencies(Manager *m) {
 648         Iterator i;
 649         Job *j;
 650
 651         assert(m);
 652
 653         /* Drops all dependencies of all installed jobs */
 654
 655         HASHMAP_FOREACH(j, m->jobs, i) {
 656                 while (j->subject_list)
 657                         job_dependency_free(j->subject_list);
 658                 while (j->object_list)
 659                         job_dependency_free(j->object_list);
 660         }
 661
 662         assert(!m->transaction_anchor);
 663 }
 664
 665 static void transaction_abort(Manager *m) {
 666         Job *j;
 667
 668         assert(m);
 669
 670         while ((j = hashmap_first(m->transaction_jobs)))
 671                 if (j->installed)
 672                         transaction_delete_job(m, j, true);
 673                 else
 674                         job_free(j);
 675
 676         assert(hashmap_isempty(m->transaction_jobs));
 677
 678         transaction_clean_dependencies(m);
 679 }
 680
 681 static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
 682         JobDependency *l;
 683
 684         assert(m);
 685
 686         /* A recursive sweep through the graph that marks all units
 687          * that matter to the anchor job, i.e. are directly or
 688          * indirectly a dependency of the anchor job via paths that
 689          * are fully marked as mattering. */
 690
 691         if (j)
 692                 l = j->subject_list;
 693         else
 694                 l = m->transaction_anchor;
 695
 696         LIST_FOREACH(subject, l, l) {
 697
 698                 /* This link does not matter */
 699                 if (!l->matters)
 700                         continue;
 701
 702                 /* This unit has already been marked */
 703                 if (l->object->generation == generation)
 704                         continue;
 705
 706                 l->object->matters_to_anchor = true;
 707                 l->object->generation = generation;
 708
 709                 transaction_find_jobs_that_matter_to_anchor(m, l->object, generation);
 710         }
 711 }
 712
 713 static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) {
 714         JobDependency *l, *last;
 715
 716         assert(j);
 717         assert(other);
 718         assert(j->unit == other->unit);
 719         assert(!j->installed);
 720
 721         /* Merges 'other' into 'j' and then deletes j. */
 722
 723         j->type = t;
 724         j->state = JOB_WAITING;
 725         j->override = j->override || other->override;
 726
 727         j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
 728
 729         /* Patch us in as new owner of the JobDependency objects */
 730         last = NULL;
 731         LIST_FOREACH(subject, l, other->subject_list) {
 732                 assert(l->subject == other);
 733                 l->subject = j;
 734                 last = l;
 735         }
 736
 737         /* Merge both lists */
 738         if (last) {
 739                 last->subject_next = j->subject_list;
 740                 if (j->subject_list)
 741                         j->subject_list->subject_prev = last;
 742                 j->subject_list = other->subject_list;
 743         }
 744
 745         /* Patch us in as new owner of the JobDependency objects */
 746         last = NULL;
 747         LIST_FOREACH(object, l, other->object_list) {
 748                 assert(l->object == other);
 749                 l->object = j;
 750                 last = l;
 751         }
 752
 753         /* Merge both lists */
 754         if (last) {
 755                 last->object_next = j->object_list;
 756                 if (j->object_list)
 757                         j->object_list->object_prev = last;
 758                 j->object_list = other->object_list;
 759         }
 760
 761         /* Kill the other job */
 762         other->subject_list = NULL;
 763         other->object_list = NULL;
 764         transaction_delete_job(m, other, true);
 765 }
 766 static bool job_is_conflicted_by(Job *j) {
 767         JobDependency *l;
 768
 769         assert(j);
 770
 771         /* Returns true if this job is pulled in by a least one
 772          * ConflictedBy dependency. */
 773
 774         LIST_FOREACH(object, l, j->object_list)
 775                 if (l->conflicts)
 776                         return true;
 777
 778         return false;
 779 }
 780
 781 static int delete_one_unmergeable_job(Manager *m, Job *j) {
 782         Job *k;
 783
 784         assert(j);
 785
 786         /* Tries to delete one item in the linked list
 787          * j->transaction_next->transaction_next->... that conflicts
 788          * with another one, in an attempt to make an inconsistent
 789          * transaction work. */
 790
 791         /* We rely here on the fact that if a merged with b does not
 792          * merge with c, either a or b merge with c neither */
 793         LIST_FOREACH(transaction, j, j)
 794                 LIST_FOREACH(transaction, k, j->transaction_next) {
 795                         Job *d;
 796
 797                         /* Is this one mergeable? Then skip it */
 798                         if (job_type_is_mergeable(j->type, k->type))
 799                                 continue;
 800
 801                         /* Ok, we found two that conflict, let's see if we can
 802                          * drop one of them */
 803                         if (!j->matters_to_anchor && !k->matters_to_anchor) {
 804
 805                                 /* Both jobs don't matter, so let's
 806                                  * find the one that is smarter to
 807                                  * remove. Let's think positive and
 808                                  * rather remove stops then starts --
 809                                  * except if something is being
 810                                  * stopped because it is conflicted by
 811                                  * another unit in which case we
 812                                  * rather remove the start. */
 813
 814                                 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)));
 815                                 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)));
 816
 817                                 if (j->type == JOB_STOP) {
 818
 819                                         if (job_is_conflicted_by(j))
 820                                                 d = k;
 821                                         else
 822                                                 d = j;
 823
 824                                 } else if (k->type == JOB_STOP) {
 825
 826                                         if (job_is_conflicted_by(k))
 827                                                 d = j;
 828                                         else
 829                                                 d = k;
 830                                 } else
 831                                         d = j;
 832
 833                         } else if (!j->matters_to_anchor)
 834                                 d = j;
 835                         else if (!k->matters_to_anchor)
 836                                 d = k;
 837                         else
 838                                 return -ENOEXEC;
 839
 840                         /* Ok, we can drop one, so let's do so. */
 841                         log_debug("Fixing conflicting jobs by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
 842                         transaction_delete_job(m, d, true);
 843                         return 0;
 844                 }
 845
 846         return -EINVAL;
 847 }
 848
 849 static int transaction_merge_jobs(Manager *m, DBusError *e) {
 850         Job *j;
 851         Iterator i;
 852         int r;
 853
 854         assert(m);
 855
 856         /* First step, check whether any of the jobs for one specific
 857          * task conflict. If so, try to drop one of them. */
 858         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 859                 JobType t;
 860                 Job *k;
 861
 862                 t = j->type;
 863                 LIST_FOREACH(transaction, k, j->transaction_next) {
 864                         if (job_type_merge(&t, k->type) >= 0)
 865                                 continue;
 866
 867                         /* OK, we could not merge all jobs for this
 868                          * action. Let's see if we can get rid of one
 869                          * of them */
 870
 871                         if ((r = delete_one_unmergeable_job(m, j)) >= 0)
 872                                 /* Ok, we managed to drop one, now
 873                                  * let's ask our callers to call us
 874                                  * again after garbage collecting */
 875                                 return -EAGAIN;
 876
 877                         /* We couldn't merge anything. Failure */
 878                         dbus_set_error(e, BUS_ERROR_TRANSACTION_JOBS_CONFLICTING, "Transaction contains conflicting jobs '%s' and '%s' for %s. Probably contradicting requirement dependencies configured.",
 879                                        job_type_to_string(t), job_type_to_string(k->type), k->unit->meta.id);
 880                         return r;
 881                 }
 882         }
 883
 884         /* Second step, merge the jobs. */
 885         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 886                 JobType t = j->type;
 887                 Job *k;
 888
 889                 /* Merge all transactions */
 890                 LIST_FOREACH(transaction, k, j->transaction_next)
 891                         assert_se(job_type_merge(&t, k->type) == 0);
 892
 893                 /* If an active job is mergeable, merge it too */
 894                 if (j->unit->meta.job)
 895                         job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */
 896
 897                 while ((k = j->transaction_next)) {
 898                         if (j->installed) {
 899                                 transaction_merge_and_delete_job(m, k, j, t);
 900                                 j = k;
 901                         } else
 902                                 transaction_merge_and_delete_job(m, j, k, t);
 903                 }
 904
 905                 if (j->unit->meta.job && !j->installed)
 906                         transaction_merge_and_delete_job(m, j, j->unit->meta.job, t);
 907
 908                 assert(!j->transaction_next);
 909                 assert(!j->transaction_prev);
 910         }
 911
 912         return 0;
 913 }
 914
 915 static void transaction_drop_redundant(Manager *m) {
 916         bool again;
 917
 918         assert(m);
 919
 920         /* Goes through the transaction and removes all jobs that are
 921          * a noop */
 922
 923         do {
 924                 Job *j;
 925                 Iterator i;
 926
 927                 again = false;
 928
 929                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
 930                         bool changes_something = false;
 931                         Job *k;
 932
 933                         LIST_FOREACH(transaction, k, j) {
 934
 935                                 if (!job_is_anchor(k) &&
 936                                     (k->installed || job_type_is_redundant(k->type, unit_active_state(k->unit))) &&
 937                                     (!k->unit->meta.job || !job_type_is_conflicting(k->type, k->unit->meta.job->type)))
 938                                         continue;
 939
 940                                 changes_something = true;
 941                                 break;
 942                         }
 943
 944                         if (changes_something)
 945                                 continue;
 946
 947                         /* log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type)); */
 948                         transaction_delete_job(m, j, false);
 949                         again = true;
 950                         break;
 951                 }
 952
 953         } while (again);
 954 }
 955
 956 static bool unit_matters_to_anchor(Unit *u, Job *j) {
 957         assert(u);
 958         assert(!j->transaction_prev);
 959
 960         /* Checks whether at least one of the jobs for this unit
 961          * matters to the anchor. */
 962
 963         LIST_FOREACH(transaction, j, j)
 964                 if (j->matters_to_anchor)
 965                         return true;
 966
 967         return false;
 968 }
 969
 970 static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation, DBusError *e) {
 971         Iterator i;
 972         Unit *u;
 973         int r;
 974
 975         assert(m);
 976         assert(j);
 977         assert(!j->transaction_prev);
 978
 979         /* Does a recursive sweep through the ordering graph, looking
 980          * for a cycle. If we find cycle we try to break it. */
 981
 982         /* Have we seen this before? */
 983         if (j->generation == generation) {
 984                 Job *k, *delete;
 985
 986                 /* If the marker is NULL we have been here already and
 987                  * decided the job was loop-free from here. Hence
 988                  * shortcut things and return right-away. */
 989                 if (!j->marker)
 990                         return 0;
 991
 992                 /* So, the marker is not NULL and we already have been
 993                  * here. We have a cycle. Let's try to break it. We go
 994                  * backwards in our path and try to find a suitable
 995                  * job to remove. We use the marker to find our way
 996                  * back, since smart how we are we stored our way back
 997                  * in there. */
 998                 log_warning("Found ordering cycle on %s/%s", j->unit->meta.id, job_type_to_string(j->type));
 999
1000                 delete = NULL;
1001                 for (k = from; k; k = ((k->generation == generation && k->marker != k) ? k->marker : NULL)) {
1002
1003                         log_info("Walked on cycle path to %s/%s", k->unit->meta.id, job_type_to_string(k->type));
1004
1005                         if (!delete &&
1006                             !k->installed &&
1007                             !unit_matters_to_anchor(k->unit, k)) {
1008                                 /* Ok, we can drop this one, so let's
1009                                  * do so. */
1010                                 delete = k;
1011                         }
1012
1013                         /* Check if this in fact was the beginning of
1014                          * the cycle */
1015                         if (k == j)
1016                                 break;
1017                 }
1018
1019
1020                 if (delete) {
1021                         log_warning("Breaking ordering cycle by deleting job %s/%s", delete->unit->meta.id, job_type_to_string(delete->type));
1022                         transaction_delete_unit(m, delete->unit);
1023                         return -EAGAIN;
1024                 }
1025
1026                 log_error("Unable to break cycle");
1027
1028                 dbus_set_error(e, BUS_ERROR_TRANSACTION_ORDER_IS_CYCLIC, "Transaction order is cyclic. See system logs for details.");
1029                 return -ENOEXEC;
1030         }
1031
1032         /* Make the marker point to where we come from, so that we can
1033          * find our way backwards if we want to break a cycle. We use
1034          * a special marker for the beginning: we point to
1035          * ourselves. */
1036         j->marker = from ? from : j;
1037         j->generation = generation;
1038
1039         /* We assume that the the dependencies are bidirectional, and
1040          * hence can ignore UNIT_AFTER */
1041         SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) {
1042                 Job *o;
1043
1044                 /* Is there a job for this unit? */
1045                 if (!(o = hashmap_get(m->transaction_jobs, u)))
1046
1047                         /* Ok, there is no job for this in the
1048                          * transaction, but maybe there is already one
1049                          * running? */
1050                         if (!(o = u->meta.job))
1051                                 continue;
1052
1053                 if ((r = transaction_verify_order_one(m, o, j, generation, e)) < 0)
1054                         return r;
1055         }
1056
1057         /* Ok, let's backtrack, and remember that this entry is not on
1058          * our path anymore. */
1059         j->marker = NULL;
1060
1061         return 0;
1062 }
1063
1064 static int transaction_verify_order(Manager *m, unsigned *generation, DBusError *e) {
1065         Job *j;
1066         int r;
1067         Iterator i;
1068         unsigned g;
1069
1070         assert(m);
1071         assert(generation);
1072
1073         /* Check if the ordering graph is cyclic. If it is, try to fix
1074          * that up by dropping one of the jobs. */
1075
1076         g = (*generation)++;
1077
1078         HASHMAP_FOREACH(j, m->transaction_jobs, i)
1079                 if ((r = transaction_verify_order_one(m, j, NULL, g, e)) < 0)
1080                         return r;
1081
1082         return 0;
1083 }
1084
1085 static void transaction_collect_garbage(Manager *m) {
1086         bool again;
1087
1088         assert(m);
1089
1090         /* Drop jobs that are not required by any other job */
1091
1092         do {
1093                 Iterator i;
1094                 Job *j;
1095
1096                 again = false;
1097
1098                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1099                         if (j->object_list) {
1100                                 /* log_debug("Keeping job %s/%s because of %s/%s", */
1101                                 /*           j->unit->meta.id, job_type_to_string(j->type), */
1102                                 /*           j->object_list->subject ? j->object_list->subject->unit->meta.id : "root", */
1103                                 /*           j->object_list->subject ? job_type_to_string(j->object_list->subject->type) : "root"); */
1104                                 continue;
1105                         }
1106
1107                         /* log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type)); */
1108                         transaction_delete_job(m, j, true);
1109                         again = true;
1110                         break;
1111                 }
1112
1113         } while (again);
1114 }
1115
1116 static int transaction_is_destructive(Manager *m, DBusError *e) {
1117         Iterator i;
1118         Job *j;
1119
1120         assert(m);
1121
1122         /* Checks whether applying this transaction means that
1123          * existing jobs would be replaced */
1124
1125         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1126
1127                 /* Assume merged */
1128                 assert(!j->transaction_prev);
1129                 assert(!j->transaction_next);
1130
1131                 if (j->unit->meta.job &&
1132                     j->unit->meta.job != j &&
1133                     !job_type_is_superset(j->type, j->unit->meta.job->type)) {
1134
1135                         dbus_set_error(e, BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE, "Transaction is destructive.");
1136                         return -EEXIST;
1137                 }
1138         }
1139
1140         return 0;
1141 }
1142
1143 static void transaction_minimize_impact(Manager *m) {
1144         bool again;
1145         assert(m);
1146
1147         /* Drops all unnecessary jobs that reverse already active jobs
1148          * or that stop a running service. */
1149
1150         do {
1151                 Job *j;
1152                 Iterator i;
1153
1154                 again = false;
1155
1156                 HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1157                         LIST_FOREACH(transaction, j, j) {
1158                                 bool stops_running_service, changes_existing_job;
1159
1160                                 /* If it matters, we shouldn't drop it */
1161                                 if (j->matters_to_anchor)
1162                                         continue;
1163
1164                                 /* Would this stop a running service?
1165                                  * Would this change an existing job?
1166                                  * If so, let's drop this entry */
1167
1168                                 stops_running_service =
1169                                         j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
1170
1171                                 changes_existing_job =
1172                                         j->unit->meta.job &&
1173                                         job_type_is_conflicting(j->type, j->unit->meta.job->type);
1174
1175                                 if (!stops_running_service && !changes_existing_job)
1176                                         continue;
1177
1178                                 if (stops_running_service)
1179                                         log_debug("%s/%s would stop a running service.", j->unit->meta.id, job_type_to_string(j->type));
1180
1181                                 if (changes_existing_job)
1182                                         log_debug("%s/%s would change existing job.", j->unit->meta.id, job_type_to_string(j->type));
1183
1184                                 /* Ok, let's get rid of this */
1185                                 log_debug("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
1186
1187                                 transaction_delete_job(m, j, true);
1188                                 again = true;
1189                                 break;
1190                         }
1191
1192                         if (again)
1193                                 break;
1194                 }
1195
1196         } while (again);
1197 }
1198
1199 static int transaction_apply(Manager *m, JobMode mode) {
1200         Iterator i;
1201         Job *j;
1202         int r;
1203
1204         /* Moves the transaction jobs to the set of active jobs */
1205
1206         if (mode == JOB_ISOLATE) {
1207
1208                 /* When isolating first kill all installed jobs which
1209                  * aren't part of the new transaction */
1210                 HASHMAP_FOREACH(j, m->jobs, i) {
1211                         assert(j->installed);
1212
1213                         if (hashmap_get(m->transaction_jobs, j->unit))
1214                                 continue;
1215
1216                         job_finish_and_invalidate(j, JOB_CANCELED);
1217                 }
1218         }
1219
1220         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1221                 /* Assume merged */
1222                 assert(!j->transaction_prev);
1223                 assert(!j->transaction_next);
1224
1225                 if (j->installed)
1226                         continue;
1227
1228                 if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0)
1229                         goto rollback;
1230         }
1231
1232         while ((j = hashmap_steal_first(m->transaction_jobs))) {
1233                 if (j->installed) {
1234                         /* log_debug("Skipping already installed job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id); */
1235                         continue;
1236                 }
1237
1238                 if (j->unit->meta.job)
1239                         job_free(j->unit->meta.job);
1240
1241                 j->unit->meta.job = j;
1242                 j->installed = true;
1243                 m->n_installed_jobs ++;
1244
1245                 /* We're fully installed. Now let's free data we don't
1246                  * need anymore. */
1247
1248                 assert(!j->transaction_next);
1249                 assert(!j->transaction_prev);
1250
1251                 job_add_to_run_queue(j);
1252                 job_add_to_dbus_queue(j);
1253                 job_start_timer(j);
1254
1255                 log_debug("Installed new job %s/%s as %u", j->unit->meta.id, job_type_to_string(j->type), (unsigned) j->id);
1256         }
1257
1258         /* As last step, kill all remaining job dependencies. */
1259         transaction_clean_dependencies(m);
1260
1261         return 0;
1262
1263 rollback:
1264
1265         HASHMAP_FOREACH(j, m->transaction_jobs, i) {
1266                 if (j->installed)
1267                         continue;
1268
1269                 hashmap_remove(m->jobs, UINT32_TO_PTR(j->id));
1270         }
1271
1272         return r;
1273 }
1274
1275 static int transaction_activate(Manager *m, JobMode mode, DBusError *e) {
1276         int r;
1277         unsigned generation = 1;
1278
1279         assert(m);
1280
1281         /* This applies the changes recorded in transaction_jobs to
1282          * the actual list of jobs, if possible. */
1283
1284         /* First step: figure out which jobs matter */
1285         transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++);
1286
1287         /* Second step: Try not to stop any running services if
1288          * we don't have to. Don't try to reverse running
1289          * jobs if we don't have to. */
1290         if (mode == JOB_FAIL)
1291                 transaction_minimize_impact(m);
1292
1293         /* Third step: Drop redundant jobs */
1294         transaction_drop_redundant(m);
1295
1296         for (;;) {
1297                 /* Fourth step: Let's remove unneeded jobs that might
1298                  * be lurking. */
1299                 if (mode != JOB_ISOLATE)
1300                         transaction_collect_garbage(m);
1301
1302                 /* Fifth step: verify order makes sense and correct
1303                  * cycles if necessary and possible */
1304                 if ((r = transaction_verify_order(m, &generation, e)) >= 0)
1305                         break;
1306
1307                 if (r != -EAGAIN) {
1308                         log_warning("Requested transaction contains an unfixable cyclic ordering dependency: %s", bus_error(e, r));
1309                         goto rollback;
1310                 }
1311
1312                 /* Let's see if the resulting transaction ordering
1313                  * graph is still cyclic... */
1314         }
1315
1316         for (;;) {
1317                 /* Sixth step: let's drop unmergeable entries if
1318                  * necessary and possible, merge entries we can
1319                  * merge */
1320                 if ((r = transaction_merge_jobs(m, e)) >= 0)
1321                         break;
1322
1323                 if (r != -EAGAIN) {
1324                         log_warning("Requested transaction contains unmergeable jobs: %s", bus_error(e, r));
1325                         goto rollback;
1326                 }
1327
1328                 /* Seventh step: an entry got dropped, let's garbage
1329                  * collect its dependencies. */
1330                 if (mode != JOB_ISOLATE)
1331                         transaction_collect_garbage(m);
1332
1333                 /* Let's see if the resulting transaction still has
1334                  * unmergeable entries ... */
1335         }
1336
1337         /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
1338         transaction_drop_redundant(m);
1339
1340         /* Ninth step: check whether we can actually apply this */
1341         if (mode == JOB_FAIL)
1342                 if ((r = transaction_is_destructive(m, e)) < 0) {
1343                         log_notice("Requested transaction contradicts existing jobs: %s", bus_error(e, r));
1344                         goto rollback;
1345                 }
1346
1347         /* Tenth step: apply changes */
1348         if ((r = transaction_apply(m, mode)) < 0) {
1349                 log_warning("Failed to apply transaction: %s", strerror(-r));
1350                 goto rollback;
1351         }
1352
1353         assert(hashmap_isempty(m->transaction_jobs));
1354         assert(!m->transaction_anchor);
1355
1356         return 0;
1357
1358 rollback:
1359         transaction_abort(m);
1360         return r;
1361 }
1362
1363 static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
1364         Job *j, *f;
1365
1366         assert(m);
1367         assert(unit);
1368
1369         /* Looks for an existing prospective job and returns that. If
1370          * it doesn't exist it is created and added to the prospective
1371          * jobs list. */
1372
1373         f = hashmap_get(m->transaction_jobs, unit);
1374
1375         LIST_FOREACH(transaction, j, f) {
1376                 assert(j->unit == unit);
1377
1378                 if (j->type == type) {
1379                         if (is_new)
1380                                 *is_new = false;
1381                         return j;
1382                 }
1383         }
1384
1385         if (unit->meta.job && unit->meta.job->type == type)
1386                 j = unit->meta.job;
1387         else if (!(j = job_new(m, type, unit)))
1388                 return NULL;
1389
1390         j->generation = 0;
1391         j->marker = NULL;
1392         j->matters_to_anchor = false;
1393         j->override = override;
1394
1395         LIST_PREPEND(Job, transaction, f, j);
1396
1397         if (hashmap_replace(m->transaction_jobs, unit, f) < 0) {
1398                 job_free(j);
1399                 return NULL;
1400         }
1401
1402         if (is_new)
1403                 *is_new = true;
1404
1405         /* log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type)); */
1406
1407         return j;
1408 }
1409
1410 void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
1411         assert(m);
1412         assert(j);
1413
1414         if (j->transaction_prev)
1415                 j->transaction_prev->transaction_next = j->transaction_next;
1416         else if (j->transaction_next)
1417                 hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next);
1418         else
1419                 hashmap_remove_value(m->transaction_jobs, j->unit, j);
1420
1421         if (j->transaction_next)
1422                 j->transaction_next->transaction_prev = j->transaction_prev;
1423
1424         j->transaction_prev = j->transaction_next = NULL;
1425
1426         while (j->subject_list)
1427                 job_dependency_free(j->subject_list);
1428
1429         while (j->object_list) {
1430                 Job *other = j->object_list->matters ? j->object_list->subject : NULL;
1431
1432                 job_dependency_free(j->object_list);
1433
1434                 if (other && delete_dependencies) {
1435                         log_debug("Deleting job %s/%s as dependency of job %s/%s",
1436                                   other->unit->meta.id, job_type_to_string(other->type),
1437                                   j->unit->meta.id, job_type_to_string(j->type));
1438                         transaction_delete_job(m, other, delete_dependencies);
1439                 }
1440         }
1441 }
1442
1443 static int transaction_add_job_and_dependencies(
1444                 Manager *m,
1445                 JobType type,
1446                 Unit *unit,
1447                 Job *by,
1448                 bool matters,
1449                 bool override,
1450                 bool conflicts,
1451                 bool ignore_requirements,
1452                 bool ignore_order,
1453                 DBusError *e,
1454                 Job **_ret) {
1455         Job *ret;
1456         Iterator i;
1457         Unit *dep;
1458         int r;
1459         bool is_new;
1460
1461         assert(m);
1462         assert(type < _JOB_TYPE_MAX);
1463         assert(unit);
1464
1465         /* log_debug("Pulling in %s/%s from %s/%s", */
1466         /*           unit->meta.id, job_type_to_string(type), */
1467         /*           by ? by->unit->meta.id : "NA", */
1468         /*           by ? job_type_to_string(by->type) : "NA"); */
1469
1470         if (unit->meta.load_state != UNIT_LOADED &&
1471             unit->meta.load_state != UNIT_ERROR &&
1472             unit->meta.load_state != UNIT_MASKED) {
1473                 dbus_set_error(e, BUS_ERROR_LOAD_FAILED, "Unit %s is not loaded properly.", unit->meta.id);
1474                 return -EINVAL;
1475         }
1476
1477         if (type != JOB_STOP && unit->meta.load_state == UNIT_ERROR) {
1478                 dbus_set_error(e, BUS_ERROR_LOAD_FAILED,
1479                                "Unit %s failed to load: %s. "
1480                                "See system logs and 'systemctl status %s' for details.",
1481                                unit->meta.id,
1482                                strerror(-unit->meta.load_error),
1483                                unit->meta.id);
1484                 return -EINVAL;
1485         }
1486
1487         if (type != JOB_STOP && unit->meta.load_state == UNIT_MASKED) {
1488                 dbus_set_error(e, BUS_ERROR_MASKED, "Unit %s is masked.", unit->meta.id);
1489                 return -EINVAL;
1490         }
1491
1492         if (!unit_job_is_applicable(unit, type)) {
1493                 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);
1494                 return -EBADR;
1495         }
1496
1497         /* First add the job. */
1498         if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
1499                 return -ENOMEM;
1500
1501         ret->ignore_order = ret->ignore_order || ignore_order;
1502
1503         /* Then, add a link to the job. */
1504         if (!job_dependency_new(by, ret, matters, conflicts))
1505                 return -ENOMEM;
1506
1507         if (is_new && !ignore_requirements) {
1508                 Set *following;
1509
1510                 /* If we are following some other unit, make sure we
1511                  * add all dependencies of everybody following. */
1512                 if (unit_following_set(ret->unit, &following) > 0) {
1513                         SET_FOREACH(dep, following, i)
1514                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
1515                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1516
1517                                         if (e)
1518                                                 dbus_error_free(e);
1519                                 }
1520
1521                         set_free(following);
1522                 }
1523
1524                 /* Finally, recursively add in all dependencies. */
1525                 if (type == JOB_START || type == JOB_RELOAD_OR_START) {
1526                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
1527                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1528                                         if (r != -EBADR)
1529                                                 goto fail;
1530
1531                                         if (e)
1532                                                 dbus_error_free(e);
1533                                 }
1534
1535                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BIND_TO], i)
1536                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1537
1538                                         if (r != -EBADR)
1539                                                 goto fail;
1540
1541                                         if (e)
1542                                                 dbus_error_free(e);
1543                                 }
1544
1545                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1546                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
1547                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1548
1549                                         if (e)
1550                                                 dbus_error_free(e);
1551                                 }
1552
1553                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
1554                                 if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, false, false, ignore_order, e, NULL)) < 0) {
1555                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1556
1557                                         if (e)
1558                                                 dbus_error_free(e);
1559                                 }
1560
1561                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
1562                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1563
1564                                         if (r != -EBADR)
1565                                                 goto fail;
1566
1567                                         if (e)
1568                                                 dbus_error_free(e);
1569                                 }
1570
1571                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1572                                 if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, false, false, ignore_order, e, NULL)) < 0) {
1573                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1574
1575                                         if (e)
1576                                                 dbus_error_free(e);
1577                                 }
1578
1579                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
1580                                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, true, false, ignore_order, e, NULL)) < 0) {
1581
1582                                         if (r != -EBADR)
1583                                                 goto fail;
1584
1585                                         if (e)
1586                                                 dbus_error_free(e);
1587                                 }
1588
1589                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTED_BY], i)
1590                                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, false, override, false, false, ignore_order, e, NULL)) < 0) {
1591                                         log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, bus_error(e, r));
1592
1593                                         if (e)
1594                                                 dbus_error_free(e);
1595                                 }
1596
1597                 } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
1598
1599                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
1600                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1601
1602                                         if (r != -EBADR)
1603                                                 goto fail;
1604
1605                                         if (e)
1606                                                 dbus_error_free(e);
1607                                 }
1608
1609                         SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_BOUND_BY], i)
1610                                 if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, false, false, ignore_order, e, NULL)) < 0) {
1611
1612                                         if (r != -EBADR)
1613                                                 goto fail;
1614
1615                                         if (e)
1616                                                 dbus_error_free(e);
1617                                 }
1618                 }
1619
1620                 /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
1621         }
1622
1623         if (_ret)
1624                 *_ret = ret;
1625
1626         return 0;
1627
1628 fail:
1629         return r;
1630 }
1631
1632 static int transaction_add_isolate_jobs(Manager *m) {
1633         Iterator i;
1634         Unit *u;
1635         char *k;
1636         int r;
1637
1638         assert(m);
1639
1640         HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1641
1642                 /* ignore aliases */
1643                 if (u->meta.id != k)
1644                         continue;
1645
1646                 if (u->meta.ignore_on_isolate)
1647                         continue;
1648
1649                 /* No need to stop inactive jobs */
1650                 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)) && !u->meta.job)
1651                         continue;
1652
1653                 /* Is there already something listed for this? */
1654                 if (hashmap_get(m->transaction_jobs, u))
1655                         continue;
1656
1657                 if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, false, false, false, NULL, NULL)) < 0)
1658                         log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
1659         }
1660
1661         return 0;
1662 }
1663
1664 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, DBusError *e, Job **_ret) {
1665         int r;
1666         Job *ret;
1667
1668         assert(m);
1669         assert(type < _JOB_TYPE_MAX);
1670         assert(unit);
1671         assert(mode < _JOB_MODE_MAX);
1672
1673         if (mode == JOB_ISOLATE && type != JOB_START) {
1674                 dbus_set_error(e, BUS_ERROR_INVALID_JOB_MODE, "Isolate is only valid for start.");
1675                 return -EINVAL;
1676         }
1677
1678         if (mode == JOB_ISOLATE && !unit->meta.allow_isolate) {
1679                 dbus_set_error(e, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
1680                 return -EPERM;
1681         }
1682
1683         log_debug("Trying to enqueue job %s/%s/%s", unit->meta.id, job_type_to_string(type), job_mode_to_string(mode));
1684
1685         if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, false,
1686                                                       mode == JOB_IGNORE_DEPENDENCIES || mode == JOB_IGNORE_REQUIREMENTS,
1687                                                       mode == JOB_IGNORE_DEPENDENCIES, e, &ret)) < 0) {
1688                 transaction_abort(m);
1689                 return r;
1690         }
1691
1692         if (mode == JOB_ISOLATE)
1693                 if ((r = transaction_add_isolate_jobs(m)) < 0) {
1694                         transaction_abort(m);
1695                         return r;
1696                 }
1697
1698         if ((r = transaction_activate(m, mode, e)) < 0)
1699                 return r;
1700
1701         log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
1702
1703         if (_ret)
1704                 *_ret = ret;
1705
1706         return 0;
1707 }
1708
1709 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, DBusError *e, Job **_ret) {
1710         Unit *unit;
1711         int r;
1712
1713         assert(m);
1714         assert(type < _JOB_TYPE_MAX);
1715         assert(name);
1716         assert(mode < _JOB_MODE_MAX);
1717
1718         if ((r = manager_load_unit(m, name, NULL, NULL, &unit)) < 0)
1719                 return r;
1720
1721         return manager_add_job(m, type, unit, mode, override, e, _ret);
1722 }
1723
1724 Job *manager_get_job(Manager *m, uint32_t id) {
1725         assert(m);
1726
1727         return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1728 }
1729
1730 Unit *manager_get_unit(Manager *m, const char *name) {
1731         assert(m);
1732         assert(name);
1733
1734         return hashmap_get(m->units, name);
1735 }
1736
1737 unsigned manager_dispatch_load_queue(Manager *m) {
1738         Meta *meta;
1739         unsigned n = 0;
1740
1741         assert(m);
1742
1743         /* Make sure we are not run recursively */
1744         if (m->dispatching_load_queue)
1745                 return 0;
1746
1747         m->dispatching_load_queue = true;
1748
1749         /* Dispatches the load queue. Takes a unit from the queue and
1750          * tries to load its data until the queue is empty */
1751
1752         while ((meta = m->load_queue)) {
1753                 assert(meta->in_load_queue);
1754
1755                 unit_load((Unit*) meta);
1756                 n++;
1757         }
1758
1759         m->dispatching_load_queue = false;
1760         return n;
1761 }
1762
1763 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1764         Unit *ret;
1765         int r;
1766
1767         assert(m);
1768         assert(name || path);
1769
1770         /* This will prepare the unit for loading, but not actually
1771          * load anything from disk. */
1772
1773         if (path && !is_path(path)) {
1774                 dbus_set_error(e, BUS_ERROR_INVALID_PATH, "Path %s is not absolute.", path);
1775                 return -EINVAL;
1776         }
1777
1778         if (!name)
1779                 name = file_name_from_path(path);
1780
1781         if (!unit_name_is_valid(name, false)) {
1782                 dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
1783                 return -EINVAL;
1784         }
1785
1786         if ((ret = manager_get_unit(m, name))) {
1787                 *_ret = ret;
1788                 return 1;
1789         }
1790
1791         if (!(ret = unit_new(m)))
1792                 return -ENOMEM;
1793
1794         if (path)
1795                 if (!(ret->meta.fragment_path = strdup(path))) {
1796                         unit_free(ret);
1797                         return -ENOMEM;
1798                 }
1799
1800         if ((r = unit_add_name(ret, name)) < 0) {
1801                 unit_free(ret);
1802                 return r;
1803         }
1804
1805         unit_add_to_load_queue(ret);
1806         unit_add_to_dbus_queue(ret);
1807         unit_add_to_gc_queue(ret);
1808
1809         if (_ret)
1810                 *_ret = ret;
1811
1812         return 0;
1813 }
1814
1815 int manager_load_unit(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
1816         int r;
1817
1818         assert(m);
1819
1820         /* This will load the service information files, but not actually
1821          * start any services or anything. */
1822
1823         if ((r = manager_load_unit_prepare(m, name, path, e, _ret)) != 0)
1824                 return r;
1825
1826         manager_dispatch_load_queue(m);
1827
1828         if (_ret)
1829                 *_ret = unit_follow_merge(*_ret);
1830
1831         return 0;
1832 }
1833
1834 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1835         Iterator i;
1836         Job *j;
1837
1838         assert(s);
1839         assert(f);
1840
1841         HASHMAP_FOREACH(j, s->jobs, i)
1842                 job_dump(j, f, prefix);
1843 }
1844
1845 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1846         Iterator i;
1847         Unit *u;
1848         const char *t;
1849
1850         assert(s);
1851         assert(f);
1852
1853         HASHMAP_FOREACH_KEY(u, t, s->units, i)
1854                 if (u->meta.id == t)
1855                         unit_dump(u, f, prefix);
1856 }
1857
1858 void manager_clear_jobs(Manager *m) {
1859         Job *j;
1860
1861         assert(m);
1862
1863         transaction_abort(m);
1864
1865         while ((j = hashmap_first(m->jobs)))
1866                 job_finish_and_invalidate(j, JOB_CANCELED);
1867 }
1868
1869 unsigned manager_dispatch_run_queue(Manager *m) {
1870         Job *j;
1871         unsigned n = 0;
1872
1873         if (m->dispatching_run_queue)
1874                 return 0;
1875
1876         m->dispatching_run_queue = true;
1877
1878         while ((j = m->run_queue)) {
1879                 assert(j->installed);
1880                 assert(j->in_run_queue);
1881
1882                 job_run_and_invalidate(j);
1883                 n++;
1884         }
1885
1886         m->dispatching_run_queue = false;
1887         return n;
1888 }
1889
1890 unsigned manager_dispatch_dbus_queue(Manager *m) {
1891         Job *j;
1892         Meta *meta;
1893         unsigned n = 0;
1894
1895         assert(m);
1896
1897         if (m->dispatching_dbus_queue)
1898                 return 0;
1899
1900         m->dispatching_dbus_queue = true;
1901
1902         while ((meta = m->dbus_unit_queue)) {
1903                 assert(meta->in_dbus_queue);
1904
1905                 bus_unit_send_change_signal((Unit*) meta);
1906                 n++;
1907         }
1908
1909         while ((j = m->dbus_job_queue)) {
1910                 assert(j->in_dbus_queue);
1911
1912                 bus_job_send_change_signal(j);
1913                 n++;
1914         }
1915
1916         m->dispatching_dbus_queue = false;
1917         return n;
1918 }
1919
1920 static int manager_process_notify_fd(Manager *m) {
1921         ssize_t n;
1922
1923         assert(m);
1924
1925         for (;;) {
1926                 char buf[4096];
1927                 struct msghdr msghdr;
1928                 struct iovec iovec;
1929                 struct ucred *ucred;
1930                 union {
1931                         struct cmsghdr cmsghdr;
1932                         uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
1933                 } control;
1934                 Unit *u;
1935                 char **tags;
1936
1937                 zero(iovec);
1938                 iovec.iov_base = buf;
1939                 iovec.iov_len = sizeof(buf)-1;
1940
1941                 zero(control);
1942                 zero(msghdr);
1943                 msghdr.msg_iov = &iovec;
1944                 msghdr.msg_iovlen = 1;
1945                 msghdr.msg_control = &control;
1946                 msghdr.msg_controllen = sizeof(control);
1947
1948                 if ((n = recvmsg(m->notify_watch.fd, &msghdr, MSG_DONTWAIT)) <= 0) {
1949                         if (n >= 0)
1950                                 return -EIO;
1951
1952                         if (errno == EAGAIN || errno == EINTR)
1953                                 break;
1954
1955                         return -errno;
1956                 }
1957
1958                 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
1959                     control.cmsghdr.cmsg_level != SOL_SOCKET ||
1960                     control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
1961                     control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
1962                         log_warning("Received notify message without credentials. Ignoring.");
1963                         continue;
1964                 }
1965
1966                 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
1967
1968                 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(ucred->pid))))
1969                         if (!(u = cgroup_unit_by_pid(m, ucred->pid))) {
1970                                 log_warning("Cannot find unit for notify message of PID %lu.", (unsigned long) ucred->pid);
1971                                 continue;
1972                         }
1973
1974                 assert((size_t) n < sizeof(buf));
1975                 buf[n] = 0;
1976                 if (!(tags = strv_split(buf, "\n\r")))
1977                         return -ENOMEM;
1978
1979                 log_debug("Got notification message for unit %s", u->meta.id);
1980
1981                 if (UNIT_VTABLE(u)->notify_message)
1982                         UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags);
1983
1984                 strv_free(tags);
1985         }
1986
1987         return 0;
1988 }
1989
1990 static int manager_dispatch_sigchld(Manager *m) {
1991         assert(m);
1992
1993         for (;;) {
1994                 siginfo_t si;
1995                 Unit *u;
1996                 int r;
1997
1998                 zero(si);
1999
2000                 /* First we call waitd() for a PID and do not reap the
2001                  * zombie. That way we can still access /proc/$PID for
2002                  * it while it is a zombie. */
2003                 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
2004
2005                         if (errno == ECHILD)
2006                                 break;
2007
2008                         if (errno == EINTR)
2009                                 continue;
2010
2011                         return -errno;
2012                 }
2013
2014                 if (si.si_pid <= 0)
2015                         break;
2016
2017                 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
2018                         char *name = NULL;
2019
2020                         get_process_name(si.si_pid, &name);
2021                         log_debug("Got SIGCHLD for process %lu (%s)", (unsigned long) si.si_pid, strna(name));
2022                         free(name);
2023                 }
2024
2025                 /* Let's flush any message the dying child might still
2026                  * have queued for us. This ensures that the process
2027                  * still exists in /proc so that we can figure out
2028                  * which cgroup and hence unit it belongs to. */
2029                 if ((r = manager_process_notify_fd(m)) < 0)
2030                         return r;
2031
2032                 /* And now figure out the unit this belongs to */
2033                 if (!(u = hashmap_get(m->watch_pids, LONG_TO_PTR(si.si_pid))))
2034                         u = cgroup_unit_by_pid(m, si.si_pid);
2035
2036                 /* And now, we actually reap the zombie. */
2037                 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
2038                         if (errno == EINTR)
2039                                 continue;
2040
2041                         return -errno;
2042                 }
2043
2044                 if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
2045                         continue;
2046
2047                 log_debug("Child %lu died (code=%s, status=%i/%s)",
2048                           (long unsigned) si.si_pid,
2049                           sigchld_code_to_string(si.si_code),
2050                           si.si_status,
2051                           strna(si.si_code == CLD_EXITED
2052                                 ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
2053                                 : signal_to_string(si.si_status)));
2054
2055                 if (!u)
2056                         continue;
2057
2058                 log_debug("Child %lu belongs to %s", (long unsigned) si.si_pid, u->meta.id);
2059
2060                 hashmap_remove(m->watch_pids, LONG_TO_PTR(si.si_pid));
2061                 UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
2062         }
2063
2064         return 0;
2065 }
2066
2067 static int manager_start_target(Manager *m, const char *name, JobMode mode) {
2068         int r;
2069         DBusError error;
2070
2071         dbus_error_init(&error);
2072
2073         log_debug("Activating special unit %s", name);
2074
2075         if ((r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL)) < 0)
2076                 log_error("Failed to enqueue %s job: %s", name, bus_error(&error, r));
2077
2078         dbus_error_free(&error);
2079
2080         return r;
2081 }
2082
2083 static int manager_process_signal_fd(Manager *m) {
2084         ssize_t n;
2085         struct signalfd_siginfo sfsi;
2086         bool sigchld = false;
2087
2088         assert(m);
2089
2090         for (;;) {
2091                 if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
2092
2093                         if (n >= 0)
2094                                 return -EIO;
2095
2096                         if (errno == EINTR || errno == EAGAIN)
2097                                 break;
2098
2099                         return -errno;
2100                 }
2101
2102                 if (sfsi.ssi_pid > 0) {
2103                         char *p = NULL;
2104
2105                         get_process_name(sfsi.ssi_pid, &p);
2106
2107                         log_debug("Received SIG%s from PID %lu (%s).",
2108                                   strna(signal_to_string(sfsi.ssi_signo)),
2109                                   (unsigned long) sfsi.ssi_pid, strna(p));
2110                         free(p);
2111                 } else
2112                         log_debug("Received SIG%s.", strna(signal_to_string(sfsi.ssi_signo)));
2113
2114                 switch (sfsi.ssi_signo) {
2115
2116                 case SIGCHLD:
2117                         sigchld = true;
2118                         break;
2119
2120                 case SIGTERM:
2121                         if (m->running_as == MANAGER_SYSTEM) {
2122                                 /* This is for compatibility with the
2123                                  * original sysvinit */
2124                                 m->exit_code = MANAGER_REEXECUTE;
2125                                 break;
2126                         }
2127
2128                         /* Fall through */
2129
2130                 case SIGINT:
2131                         if (m->running_as == MANAGER_SYSTEM) {
2132                                 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE);
2133                                 break;
2134                         }
2135
2136                         /* Run the exit target if there is one, if not, just exit. */
2137                         if (manager_start_target(m, SPECIAL_EXIT_TARGET, JOB_REPLACE) < 0) {
2138                                 m->exit_code = MANAGER_EXIT;
2139                                 return 0;
2140                         }
2141
2142                         break;
2143
2144                 case SIGWINCH:
2145                         if (m->running_as == MANAGER_SYSTEM)
2146                                 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
2147
2148                         /* This is a nop on non-init */
2149                         break;
2150
2151                 case SIGPWR:
2152                         if (m->running_as == MANAGER_SYSTEM)
2153                                 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
2154
2155                         /* This is a nop on non-init */
2156                         break;
2157
2158                 case SIGUSR1: {
2159                         Unit *u;
2160
2161                         u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
2162
2163                         if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
2164                                 log_info("Trying to reconnect to bus...");
2165                                 bus_init(m, true);
2166                         }
2167
2168                         if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
2169                                 log_info("Loading D-Bus service...");
2170                                 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
2171                         }
2172
2173                         break;
2174                 }
2175
2176                 case SIGUSR2: {
2177                         FILE *f;
2178                         char *dump = NULL;
2179                         size_t size;
2180
2181                         if (!(f = open_memstream(&dump, &size))) {
2182                                 log_warning("Failed to allocate memory stream.");
2183                                 break;
2184                         }
2185
2186                         manager_dump_units(m, f, "\t");
2187                         manager_dump_jobs(m, f, "\t");
2188
2189                         if (ferror(f)) {
2190                                 fclose(f);
2191                                 free(dump);
2192                                 log_warning("Failed to write status stream");
2193                                 break;
2194                         }
2195
2196                         fclose(f);
2197                         log_dump(LOG_INFO, dump);
2198                         free(dump);
2199
2200                         break;
2201                 }
2202
2203                 case SIGHUP:
2204                         m->exit_code = MANAGER_RELOAD;
2205                         break;
2206
2207                 default: {
2208
2209                         /* Starting SIGRTMIN+0 */
2210                         static const char * const target_table[] = {
2211                                 [0] = SPECIAL_DEFAULT_TARGET,
2212                                 [1] = SPECIAL_RESCUE_TARGET,
2213                                 [2] = SPECIAL_EMERGENCY_TARGET,
2214                                 [3] = SPECIAL_HALT_TARGET,
2215                                 [4] = SPECIAL_POWEROFF_TARGET,
2216                                 [5] = SPECIAL_REBOOT_TARGET,
2217                                 [6] = SPECIAL_KEXEC_TARGET
2218                         };
2219
2220                         /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
2221                         static const ManagerExitCode code_table[] = {
2222                                 [0] = MANAGER_HALT,
2223                                 [1] = MANAGER_POWEROFF,
2224                                 [2] = MANAGER_REBOOT,
2225                                 [3] = MANAGER_KEXEC
2226                         };
2227
2228                         if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
2229                             (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
2230                                 manager_start_target(m, target_table[sfsi.ssi_signo - SIGRTMIN],
2231                                                      (sfsi.ssi_signo == 1 || sfsi.ssi_signo == 2) ? JOB_ISOLATE : JOB_REPLACE);
2232                                 break;
2233                         }
2234
2235                         if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
2236                             (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(code_table)) {
2237                                 m->exit_code = code_table[sfsi.ssi_signo - SIGRTMIN - 13];
2238                                 break;
2239                         }
2240
2241                         switch (sfsi.ssi_signo - SIGRTMIN) {
2242
2243                         case 20:
2244                                 log_debug("Enabling showing of status.");
2245                                 m->show_status = true;
2246                                 break;
2247
2248                         case 21:
2249                                 log_debug("Disabling showing of status.");
2250                                 m->show_status = false;
2251                                 break;
2252
2253                         case 22:
2254                                 log_set_max_level(LOG_DEBUG);
2255                                 log_notice("Setting log level to debug.");
2256                                 break;
2257
2258                         case 23:
2259                                 log_set_max_level(LOG_INFO);
2260                                 log_notice("Setting log level to info.");
2261                                 break;
2262
2263                         case 27:
2264                                 log_set_target(LOG_TARGET_CONSOLE);
2265                                 log_notice("Setting log target to console.");
2266                                 break;
2267
2268                         case 28:
2269                                 log_set_target(LOG_TARGET_KMSG);
2270                                 log_notice("Setting log target to kmsg.");
2271                                 break;
2272
2273                         case 29:
2274                                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
2275                                 log_notice("Setting log target to syslog-or-kmsg.");
2276                                 break;
2277
2278                         default:
2279                                 log_warning("Got unhandled signal <%s>.", strna(signal_to_string(sfsi.ssi_signo)));
2280                         }
2281                 }
2282                 }
2283         }
2284
2285         if (sigchld)
2286                 return manager_dispatch_sigchld(m);
2287
2288         return 0;
2289 }
2290
2291 static int process_event(Manager *m, struct epoll_event *ev) {
2292         int r;
2293         Watch *w;
2294
2295         assert(m);
2296         assert(ev);
2297
2298         assert_se(w = ev->data.ptr);
2299
2300         if (w->type == WATCH_INVALID)
2301                 return 0;
2302
2303         switch (w->type) {
2304
2305         case WATCH_SIGNAL:
2306
2307                 /* An incoming signal? */
2308                 if (ev->events != EPOLLIN)
2309                         return -EINVAL;
2310
2311                 if ((r = manager_process_signal_fd(m)) < 0)
2312                         return r;
2313
2314                 break;
2315
2316         case WATCH_NOTIFY:
2317
2318                 /* An incoming daemon notification event? */
2319                 if (ev->events != EPOLLIN)
2320                         return -EINVAL;
2321
2322                 if ((r = manager_process_notify_fd(m)) < 0)
2323                         return r;
2324
2325                 break;
2326
2327         case WATCH_FD:
2328
2329                 /* Some fd event, to be dispatched to the units */
2330                 UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
2331                 break;
2332
2333         case WATCH_UNIT_TIMER:
2334         case WATCH_JOB_TIMER: {
2335                 uint64_t v;
2336                 ssize_t k;
2337
2338                 /* Some timer event, to be dispatched to the units */
2339                 if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
2340
2341                         if (k < 0 && (errno == EINTR || errno == EAGAIN))
2342                                 break;
2343
2344                         return k < 0 ? -errno : -EIO;
2345                 }
2346
2347                 if (w->type == WATCH_UNIT_TIMER)
2348                         UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
2349                 else
2350                         job_timer_event(w->data.job, v, w);
2351                 break;
2352         }
2353
2354         case WATCH_MOUNT:
2355                 /* Some mount table change, intended for the mount subsystem */
2356                 mount_fd_event(m, ev->events);
2357                 break;
2358
2359         case WATCH_SWAP:
2360                 /* Some swap table change, intended for the swap subsystem */
2361                 swap_fd_event(m, ev->events);
2362                 break;
2363
2364         case WATCH_UDEV:
2365                 /* Some notification from udev, intended for the device subsystem */
2366                 device_fd_event(m, ev->events);
2367                 break;
2368
2369         case WATCH_DBUS_WATCH:
2370                 bus_watch_event(m, w, ev->events);
2371                 break;
2372
2373         case WATCH_DBUS_TIMEOUT:
2374                 bus_timeout_event(m, w, ev->events);
2375                 break;
2376
2377         default:
2378                 log_error("event type=%i", w->type);
2379                 assert_not_reached("Unknown epoll event type.");
2380         }
2381
2382         return 0;
2383 }
2384
2385 int manager_loop(Manager *m) {
2386         int r;
2387
2388         RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 50000);
2389
2390         assert(m);
2391         m->exit_code = MANAGER_RUNNING;
2392
2393         /* Release the path cache */
2394         set_free_free(m->unit_path_cache);
2395         m->unit_path_cache = NULL;
2396
2397         manager_check_finished(m);
2398
2399         /* There might still be some zombies hanging around from
2400          * before we were exec()'ed. Leat's reap them */
2401         if ((r = manager_dispatch_sigchld(m)) < 0)
2402                 return r;
2403
2404         while (m->exit_code == MANAGER_RUNNING) {
2405                 struct epoll_event event;
2406                 int n;
2407
2408                 if (!ratelimit_test(&rl)) {
2409                         /* Yay, something is going seriously wrong, pause a little */
2410                         log_warning("Looping too fast. Throttling execution a little.");
2411                         sleep(1);
2412                 }
2413
2414                 if (manager_dispatch_load_queue(m) > 0)
2415                         continue;
2416
2417                 if (manager_dispatch_run_queue(m) > 0)
2418                         continue;
2419
2420                 if (bus_dispatch(m) > 0)
2421                         continue;
2422
2423                 if (manager_dispatch_cleanup_queue(m) > 0)
2424                         continue;
2425
2426                 if (manager_dispatch_gc_queue(m) > 0)
2427                         continue;
2428
2429                 if (manager_dispatch_dbus_queue(m) > 0)
2430                         continue;
2431
2432                 if (swap_dispatch_reload(m) > 0)
2433                         continue;
2434
2435                 if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
2436
2437                         if (errno == EINTR)
2438                                 continue;
2439
2440                         return -errno;
2441                 }
2442
2443                 assert(n == 1);
2444
2445                 if ((r = process_event(m, &event)) < 0)
2446                         return r;
2447         }
2448
2449         return m->exit_code;
2450 }
2451
2452 int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
2453         char *n;
2454         Unit *u;
2455
2456         assert(m);
2457         assert(s);
2458         assert(_u);
2459
2460         if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
2461                 return -EINVAL;
2462
2463         if (!(n = bus_path_unescape(s+31)))
2464                 return -ENOMEM;
2465
2466         u = manager_get_unit(m, n);
2467         free(n);
2468
2469         if (!u)
2470                 return -ENOENT;
2471
2472         *_u = u;
2473
2474         return 0;
2475 }
2476
2477 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2478         Job *j;
2479         unsigned id;
2480         int r;
2481
2482         assert(m);
2483         assert(s);
2484         assert(_j);
2485
2486         if (!startswith(s, "/org/freedesktop/systemd1/job/"))
2487                 return -EINVAL;
2488
2489         if ((r = safe_atou(s + 30, &id)) < 0)
2490                 return r;
2491
2492         if (!(j = manager_get_job(m, id)))
2493                 return -ENOENT;
2494
2495         *_j = j;
2496
2497         return 0;
2498 }
2499
2500 void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
2501
2502 #ifdef HAVE_AUDIT
2503         char *p;
2504
2505         if (m->audit_fd < 0)
2506                 return;
2507
2508         /* Don't generate audit events if the service was already
2509          * started and we're just deserializing */
2510         if (m->n_reloading > 0)
2511                 return;
2512
2513         if (m->running_as != MANAGER_SYSTEM)
2514                 return;
2515
2516         if (u->meta.type != UNIT_SERVICE)
2517                 return;
2518
2519         if (!(p = unit_name_to_prefix_and_instance(u->meta.id))) {
2520                 log_error("Failed to allocate unit name for audit message: %s", strerror(ENOMEM));
2521                 return;
2522         }
2523
2524         if (audit_log_user_comm_message(m->audit_fd, type, "", p, NULL, NULL, NULL, success) < 0) {
2525                 log_warning("Failed to send audit message: %m");
2526
2527                 if (errno == EPERM) {
2528                         /* We aren't allowed to send audit messages?
2529                          * Then let's not retry again, to avoid
2530                          * spamming the user with the same and same
2531                          * messages over and over. */
2532
2533                         audit_close(m->audit_fd);
2534                         m->audit_fd = -1;
2535                 }
2536         }
2537
2538         free(p);
2539 #endif
2540
2541 }
2542
2543 void manager_send_unit_plymouth(Manager *m, Unit *u) {
2544         int fd = -1;
2545         union sockaddr_union sa;
2546         int n = 0;
2547         char *message = NULL;
2548
2549         /* Don't generate plymouth events if the service was already
2550          * started and we're just deserializing */
2551         if (m->n_reloading > 0)
2552                 return;
2553
2554         if (m->running_as != MANAGER_SYSTEM)
2555                 return;
2556
2557         if (u->meta.type != UNIT_SERVICE &&
2558             u->meta.type != UNIT_MOUNT &&
2559             u->meta.type != UNIT_SWAP)
2560                 return;
2561
2562         /* We set SOCK_NONBLOCK here so that we rather drop the
2563          * message then wait for plymouth */
2564         if ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
2565                 log_error("socket() failed: %m");
2566                 return;
2567         }
2568
2569         zero(sa);
2570         sa.sa.sa_family = AF_UNIX;
2571         strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
2572         if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
2573
2574                 if (errno != EPIPE &&
2575                     errno != EAGAIN &&
2576                     errno != ENOENT &&
2577                     errno != ECONNREFUSED &&
2578                     errno != ECONNRESET &&
2579                     errno != ECONNABORTED)
2580                         log_error("connect() failed: %m");
2581
2582                 goto finish;
2583         }
2584
2585         if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->meta.id) + 1), u->meta.id, &n) < 0) {
2586                 log_error("Out of memory");
2587                 goto finish;
2588         }
2589
2590         errno = 0;
2591         if (write(fd, message, n + 1) != n + 1) {
2592
2593                 if (errno != EPIPE &&
2594                     errno != EAGAIN &&
2595                     errno != ENOENT &&
2596                     errno != ECONNREFUSED &&
2597                     errno != ECONNRESET &&
2598                     errno != ECONNABORTED)
2599                         log_error("Failed to write Plymouth message: %m");
2600
2601                 goto finish;
2602         }
2603
2604 finish:
2605         if (fd >= 0)
2606                 close_nointr_nofail(fd);
2607
2608         free(message);
2609 }
2610
2611 void manager_dispatch_bus_name_owner_changed(
2612                 Manager *m,
2613                 const char *name,
2614                 const char* old_owner,
2615                 const char *new_owner) {
2616
2617         Unit *u;
2618
2619         assert(m);
2620         assert(name);
2621
2622         if (!(u = hashmap_get(m->watch_bus, name)))
2623                 return;
2624
2625         UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
2626 }
2627
2628 void manager_dispatch_bus_query_pid_done(
2629                 Manager *m,
2630                 const char *name,
2631                 pid_t pid) {
2632
2633         Unit *u;
2634
2635         assert(m);
2636         assert(name);
2637         assert(pid >= 1);
2638
2639         if (!(u = hashmap_get(m->watch_bus, name)))
2640                 return;
2641
2642         UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
2643 }
2644
2645 int manager_open_serialization(Manager *m, FILE **_f) {
2646         char *path = NULL;
2647         mode_t saved_umask;
2648         int fd;
2649         FILE *f;
2650
2651         assert(_f);
2652
2653         if (m->running_as == MANAGER_SYSTEM)
2654                 asprintf(&path, "/run/systemd/dump-%lu-XXXXXX", (unsigned long) getpid());
2655         else
2656                 asprintf(&path, "/tmp/systemd-dump-%lu-XXXXXX", (unsigned long) getpid());
2657
2658         if (!path)
2659                 return -ENOMEM;
2660
2661         saved_umask = umask(0077);
2662         fd = mkostemp(path, O_RDWR|O_CLOEXEC);
2663         umask(saved_umask);
2664
2665         if (fd < 0) {
2666                 free(path);
2667                 return -errno;
2668         }
2669
2670         unlink(path);
2671
2672         log_debug("Serializing state to %s", path);
2673         free(path);
2674
2675         if (!(f = fdopen(fd, "w+")))
2676                 return -errno;
2677
2678         *_f = f;
2679
2680         return 0;
2681 }
2682
2683 int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
2684         Iterator i;
2685         Unit *u;
2686         const char *t;
2687         int r;
2688
2689         assert(m);
2690         assert(f);
2691         assert(fds);
2692
2693         m->n_reloading ++;
2694
2695         fprintf(f, "current-job-id=%i\n", m->current_job_id);
2696         fprintf(f, "taint-usr=%s\n", yes_no(m->taint_usr));
2697
2698         dual_timestamp_serialize(f, "initrd-timestamp", &m->initrd_timestamp);
2699         dual_timestamp_serialize(f, "startup-timestamp", &m->startup_timestamp);
2700         dual_timestamp_serialize(f, "finish-timestamp", &m->finish_timestamp);
2701
2702         fputc('\n', f);
2703
2704         HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2705                 if (u->meta.id != t)
2706                         continue;
2707
2708                 if (!unit_can_serialize(u))
2709                         continue;
2710
2711                 /* Start marker */
2712                 fputs(u->meta.id, f);
2713                 fputc('\n', f);
2714
2715                 if ((r = unit_serialize(u, f, fds)) < 0) {
2716                         m->n_reloading --;
2717                         return r;
2718                 }
2719         }
2720
2721         assert(m->n_reloading > 0);
2722         m->n_reloading --;
2723
2724         if (ferror(f))
2725                 return -EIO;
2726
2727         r = bus_fdset_add_all(m, fds);
2728         if (r < 0)
2729                 return r;
2730
2731         return 0;
2732 }
2733
2734 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2735         int r = 0;
2736
2737         assert(m);
2738         assert(f);
2739
2740         log_debug("Deserializing state...");
2741
2742         m->n_reloading ++;
2743
2744         for (;;) {
2745                 char line[LINE_MAX], *l;
2746
2747                 if (!fgets(line, sizeof(line), f)) {
2748                         if (feof(f))
2749                                 r = 0;
2750                         else
2751                                 r = -errno;
2752
2753                         goto finish;
2754                 }
2755
2756                 char_array_0(line);
2757                 l = strstrip(line);
2758
2759                 if (l[0] == 0)
2760                         break;
2761
2762                 if (startswith(l, "current-job-id=")) {
2763                         uint32_t id;
2764
2765                         if (safe_atou32(l+15, &id) < 0)
2766                                 log_debug("Failed to parse current job id value %s", l+15);
2767                         else
2768                                 m->current_job_id = MAX(m->current_job_id, id);
2769                 } else if (startswith(l, "taint-usr=")) {
2770                         int b;
2771
2772                         if ((b = parse_boolean(l+10)) < 0)
2773                                 log_debug("Failed to parse taint /usr flag %s", l+10);
2774                         else
2775                                 m->taint_usr = m->taint_usr || b;
2776                 } else if (startswith(l, "initrd-timestamp="))
2777                         dual_timestamp_deserialize(l+17, &m->initrd_timestamp);
2778                 else if (startswith(l, "startup-timestamp="))
2779                         dual_timestamp_deserialize(l+18, &m->startup_timestamp);
2780                 else if (startswith(l, "finish-timestamp="))
2781                         dual_timestamp_deserialize(l+17, &m->finish_timestamp);
2782                 else
2783                         log_debug("Unknown serialization item '%s'", l);
2784         }
2785
2786         for (;;) {
2787                 Unit *u;
2788                 char name[UNIT_NAME_MAX+2];
2789
2790                 /* Start marker */
2791                 if (!fgets(name, sizeof(name), f)) {
2792                         if (feof(f))
2793                                 r = 0;
2794                         else
2795                                 r = -errno;
2796
2797                         goto finish;
2798                 }
2799
2800                 char_array_0(name);
2801
2802                 if ((r = manager_load_unit(m, strstrip(name), NULL, NULL, &u)) < 0)
2803                         goto finish;
2804
2805                 if ((r = unit_deserialize(u, f, fds)) < 0)
2806                         goto finish;
2807         }
2808
2809 finish:
2810         if (ferror(f)) {
2811                 r = -EIO;
2812                 goto finish;
2813         }
2814
2815         assert(m->n_reloading > 0);
2816         m->n_reloading --;
2817
2818         return r;
2819 }
2820
2821 int manager_reload(Manager *m) {
2822         int r, q;
2823         FILE *f;
2824         FDSet *fds;
2825
2826         assert(m);
2827
2828         if ((r = manager_open_serialization(m, &f)) < 0)
2829                 return r;
2830
2831         m->n_reloading ++;
2832
2833         if (!(fds = fdset_new())) {
2834                 m->n_reloading --;
2835                 r = -ENOMEM;
2836                 goto finish;
2837         }
2838
2839         if ((r = manager_serialize(m, f, fds)) < 0) {
2840                 m->n_reloading --;
2841                 goto finish;
2842         }
2843
2844         if (fseeko(f, 0, SEEK_SET) < 0) {
2845                 m->n_reloading --;
2846                 r = -errno;
2847                 goto finish;
2848         }
2849
2850         /* From here on there is no way back. */
2851         manager_clear_jobs_and_units(m);
2852         manager_undo_generators(m);
2853
2854         /* Find new unit paths */
2855         lookup_paths_free(&m->lookup_paths);
2856         if ((q = lookup_paths_init(&m->lookup_paths, m->running_as, true)) < 0)
2857                 r = q;
2858
2859         manager_run_generators(m);
2860
2861         manager_build_unit_path_cache(m);
2862
2863         /* First, enumerate what we can from all config files */
2864         if ((q = manager_enumerate(m)) < 0)
2865                 r = q;
2866
2867         /* Second, deserialize our stored data */
2868         if ((q = manager_deserialize(m, f, fds)) < 0)
2869                 r = q;
2870
2871         fclose(f);
2872         f = NULL;
2873
2874         /* Third, fire things up! */
2875         if ((q = manager_coldplug(m)) < 0)
2876                 r = q;
2877
2878         assert(m->n_reloading > 0);
2879         m->n_reloading--;
2880
2881 finish:
2882         if (f)
2883                 fclose(f);
2884
2885         if (fds)
2886                 fdset_free(fds);
2887
2888         return r;
2889 }
2890
2891 bool manager_is_booting_or_shutting_down(Manager *m) {
2892         Unit *u;
2893
2894         assert(m);
2895
2896         /* Is the initial job still around? */
2897         if (manager_get_job(m, 1))
2898                 return true;
2899
2900         /* Is there a job for the shutdown target? */
2901         if (((u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET))))
2902                 return !!u->meta.job;
2903
2904         return false;
2905 }
2906
2907 void manager_reset_failed(Manager *m) {
2908         Unit *u;
2909         Iterator i;
2910
2911         assert(m);
2912
2913         HASHMAP_FOREACH(u, m->units, i)
2914                 unit_reset_failed(u);
2915 }
2916
2917 bool manager_unit_pending_inactive(Manager *m, const char *name) {
2918         Unit *u;
2919
2920         assert(m);
2921         assert(name);
2922
2923         /* Returns true if the unit is inactive or going down */
2924         if (!(u = manager_get_unit(m, name)))
2925                 return true;
2926
2927         return unit_pending_inactive(u);
2928 }
2929
2930 void manager_check_finished(Manager *m) {
2931         char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX];
2932         usec_t kernel_usec = 0, initrd_usec = 0, userspace_usec = 0, total_usec = 0;
2933
2934         assert(m);
2935
2936         if (dual_timestamp_is_set(&m->finish_timestamp))
2937                 return;
2938
2939         if (hashmap_size(m->jobs) > 0)
2940                 return;
2941
2942         dual_timestamp_get(&m->finish_timestamp);
2943
2944         if (m->running_as == MANAGER_SYSTEM && detect_container(NULL) <= 0) {
2945
2946                 userspace_usec = m->finish_timestamp.monotonic - m->startup_timestamp.monotonic;
2947                 total_usec = m->finish_timestamp.monotonic;
2948
2949                 if (dual_timestamp_is_set(&m->initrd_timestamp)) {
2950
2951                         kernel_usec = m->initrd_timestamp.monotonic;
2952                         initrd_usec = m->startup_timestamp.monotonic - m->initrd_timestamp.monotonic;
2953
2954                         log_info("Startup finished in %s (kernel) + %s (initrd) + %s (userspace) = %s.",
2955                                  format_timespan(kernel, sizeof(kernel), kernel_usec),
2956                                  format_timespan(initrd, sizeof(initrd), initrd_usec),
2957                                  format_timespan(userspace, sizeof(userspace), userspace_usec),
2958                                  format_timespan(sum, sizeof(sum), total_usec));
2959                 } else {
2960                         kernel_usec = m->startup_timestamp.monotonic;
2961                         initrd_usec = 0;
2962
2963                         log_info("Startup finished in %s (kernel) + %s (userspace) = %s.",
2964                                  format_timespan(kernel, sizeof(kernel), kernel_usec),
2965                                  format_timespan(userspace, sizeof(userspace), userspace_usec),
2966                                  format_timespan(sum, sizeof(sum), total_usec));
2967                 }
2968         } else {
2969                 userspace_usec = initrd_usec = kernel_usec = 0;
2970                 total_usec = m->finish_timestamp.monotonic - m->startup_timestamp.monotonic;
2971
2972                 log_debug("Startup finished in %s.",
2973                           format_timespan(sum, sizeof(sum), total_usec));
2974         }
2975
2976         bus_broadcast_finished(m, kernel_usec, initrd_usec, userspace_usec, total_usec);
2977
2978         sd_notifyf(false,
2979                    "READY=1\nSTATUS=Startup finished in %s.",
2980                    format_timespan(sum, sizeof(sum), total_usec));
2981 }
2982
2983 void manager_run_generators(Manager *m) {
2984         DIR *d = NULL;
2985         const char *generator_path;
2986         const char *argv[3];
2987
2988         assert(m);
2989
2990         generator_path = m->running_as == MANAGER_SYSTEM ? SYSTEM_GENERATOR_PATH : USER_GENERATOR_PATH;
2991         if (!(d = opendir(generator_path))) {
2992
2993                 if (errno == ENOENT)
2994                         return;
2995
2996                 log_error("Failed to enumerate generator directory: %m");
2997                 return;
2998         }
2999
3000         if (!m->generator_unit_path) {
3001                 const char *p;
3002                 char user_path[] = "/tmp/systemd-generator-XXXXXX";
3003
3004                 if (m->running_as == MANAGER_SYSTEM && getpid() == 1) {
3005                         p = "/run/systemd/generator";
3006
3007                         if (mkdir_p(p, 0755) < 0) {
3008                                 log_error("Failed to create generator directory: %m");
3009                                 goto finish;
3010                         }
3011
3012                 } else {
3013                         if (!(p = mkdtemp(user_path))) {
3014                                 log_error("Failed to create generator directory: %m");
3015                                 goto finish;
3016                         }
3017                 }
3018
3019                 if (!(m->generator_unit_path = strdup(p))) {
3020                         log_error("Failed to allocate generator unit path.");
3021                         goto finish;
3022                 }
3023         }
3024
3025         argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */
3026         argv[1] = m->generator_unit_path;
3027         argv[2] = NULL;
3028
3029         execute_directory(generator_path, d, (char**) argv);
3030
3031         if (rmdir(m->generator_unit_path) >= 0) {
3032                 /* Uh? we were able to remove this dir? I guess that
3033                  * means the directory was empty, hence let's shortcut
3034                  * this */
3035
3036                 free(m->generator_unit_path);
3037                 m->generator_unit_path = NULL;
3038                 goto finish;
3039         }
3040
3041         if (!strv_find(m->lookup_paths.unit_path, m->generator_unit_path)) {
3042                 char **l;
3043
3044                 if (!(l = strv_append(m->lookup_paths.unit_path, m->generator_unit_path))) {
3045                         log_error("Failed to add generator directory to unit search path: %m");
3046                         goto finish;
3047                 }
3048
3049                 strv_free(m->lookup_paths.unit_path);
3050                 m->lookup_paths.unit_path = l;
3051
3052                 log_debug("Added generator unit path %s to search path.", m->generator_unit_path);
3053         }
3054
3055 finish:
3056         if (d)
3057                 closedir(d);
3058 }
3059
3060 void manager_undo_generators(Manager *m) {
3061         assert(m);
3062
3063         if (!m->generator_unit_path)
3064                 return;
3065
3066         strv_remove(m->lookup_paths.unit_path, m->generator_unit_path);
3067         rm_rf(m->generator_unit_path, false, true);
3068
3069         free(m->generator_unit_path);
3070         m->generator_unit_path = NULL;
3071 }
3072
3073 int manager_set_default_controllers(Manager *m, char **controllers) {
3074         char **l;
3075
3076         assert(m);
3077
3078         if (!(l = strv_copy(controllers)))
3079                 return -ENOMEM;
3080
3081         strv_free(m->default_controllers);
3082         m->default_controllers = l;
3083
3084         return 0;
3085 }
3086
3087 void manager_recheck_syslog(Manager *m) {
3088         Unit *u;
3089
3090         assert(m);
3091
3092         if (m->running_as != MANAGER_SYSTEM)
3093                 return;
3094
3095         if ((u = manager_get_unit(m, SPECIAL_SYSLOG_SOCKET))) {
3096                 SocketState state;
3097
3098                 state = SOCKET(u)->state;
3099
3100                 if (state != SOCKET_DEAD &&
3101                     state != SOCKET_FAILED &&
3102                     state != SOCKET_RUNNING) {
3103
3104                         /* Hmm, the socket is not set up, or is still
3105                          * listening, let's better not try to use
3106                          * it. Note that we have no problem if the
3107                          * socket is completely down, since there
3108                          * might be a foreign /dev/log socket around
3109                          * and we want to make use of that.
3110                          */
3111
3112                         log_close_syslog();
3113                         return;
3114                 }
3115         }
3116
3117         if ((u = manager_get_unit(m, SPECIAL_SYSLOG_TARGET)))
3118                 if (TARGET(u)->state != TARGET_ACTIVE) {
3119                         log_close_syslog();
3120                         return;
3121                 }
3122
3123         /* Hmm, OK, so the socket is either fully up, or fully down,
3124          * and the target is up, then let's make use of the socket */
3125         log_open();
3126 }
3127
3128 static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
3129         [MANAGER_SYSTEM] = "system",
3130         [MANAGER_USER] = "user"
3131 };
3132
3133 DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);