src/main.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 <dbus/dbus.h>
  23
  24 #include <stdio.h>
  25 #include <errno.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <getopt.h>
  31 #include <signal.h>
  32 #include <sys/wait.h>
  33 #include <fcntl.h>
  34 #include <sys/prctl.h>
  35
  36 #include "manager.h"
  37 #include "log.h"
  38 #include "mount-setup.h"
  39 #include "hostname-setup.h"
  40 #include "loopback-setup.h"
  41 #include "kmod-setup.h"
  42 #include "locale-setup.h"
  43 #include "selinux-setup.h"
  44 #include "machine-id-setup.h"
  45 #include "load-fragment.h"
  46 #include "fdset.h"
  47 #include "special.h"
  48 #include "conf-parser.h"
  49 #include "bus-errors.h"
  50 #include "missing.h"
  51 #include "label.h"
  52 #include "build.h"
  53 #include "strv.h"
  54 #include "def.h"
  55 #include "virt.h"
  56
  57 static enum {
  58         ACTION_RUN,
  59         ACTION_HELP,
  60         ACTION_TEST,
  61         ACTION_DUMP_CONFIGURATION_ITEMS,
  62         ACTION_DONE
  63 } arg_action = ACTION_RUN;
  64
  65 static char *arg_default_unit = NULL;
  66 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
  67
  68 static bool arg_dump_core = true;
  69 static bool arg_crash_shell = false;
  70 static int arg_crash_chvt = -1;
  71 static bool arg_confirm_spawn = false;
  72 static bool arg_show_status = true;
  73 #ifdef HAVE_SYSV_COMPAT
  74 static bool arg_sysv_console = true;
  75 #endif
  76 static bool arg_mount_auto = true;
  77 static bool arg_swap_auto = true;
  78 static char **arg_default_controllers = NULL;
  79 static char ***arg_join_controllers = NULL;
  80 static ExecOutput arg_default_std_output = EXEC_OUTPUT_SYSLOG;
  81 static ExecOutput arg_default_std_error = EXEC_OUTPUT_INHERIT;
  82
  83 static FILE* serialization = NULL;
  84
  85 static void nop_handler(int sig) {
  86 }
  87
  88 _noreturn_ static void crash(int sig) {
  89
  90         if (!arg_dump_core)
  91                 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
  92         else {
  93                 struct sigaction sa;
  94                 pid_t pid;
  95
  96                 /* We want to wait for the core process, hence let's enable SIGCHLD */
  97                 zero(sa);
  98                 sa.sa_handler = nop_handler;
  99                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
 100                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 101
 102                 if ((pid = fork()) < 0)
 103                         log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
 104
 105                 else if (pid == 0) {
 106                         struct rlimit rl;
 107
 108                         /* Enable default signal handler for core dump */
 109                         zero(sa);
 110                         sa.sa_handler = SIG_DFL;
 111                         assert_se(sigaction(sig, &sa, NULL) == 0);
 112
 113                         /* Don't limit the core dump size */
 114                         zero(rl);
 115                         rl.rlim_cur = RLIM_INFINITY;
 116                         rl.rlim_max = RLIM_INFINITY;
 117                         setrlimit(RLIMIT_CORE, &rl);
 118
 119                         /* Just to be sure... */
 120                         assert_se(chdir("/") == 0);
 121
 122                         /* Raise the signal again */
 123                         raise(sig);
 124
 125                         assert_not_reached("We shouldn't be here...");
 126                         _exit(1);
 127
 128                 } else {
 129                         siginfo_t status;
 130                         int r;
 131
 132                         /* Order things nicely. */
 133                         if ((r = wait_for_terminate(pid, &status)) < 0)
 134                                 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(-r));
 135                         else if (status.si_code != CLD_DUMPED)
 136                                 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
 137                         else
 138                                 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
 139                 }
 140         }
 141
 142         if (arg_crash_chvt)
 143                 chvt(arg_crash_chvt);
 144
 145         if (arg_crash_shell) {
 146                 struct sigaction sa;
 147                 pid_t pid;
 148
 149                 log_info("Executing crash shell in 10s...");
 150                 sleep(10);
 151
 152                 /* Let the kernel reap children for us */
 153                 zero(sa);
 154                 sa.sa_handler = SIG_IGN;
 155                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 156                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 157
 158                 if ((pid = fork()) < 0)
 159                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 160                 else if (pid == 0) {
 161                         int fd, r;
 162
 163                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
 164                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
 165                         else if ((r = make_stdio(fd)) < 0)
 166                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
 167
 168                         execl("/bin/sh", "/bin/sh", NULL);
 169
 170                         log_error("execl() failed: %s", strerror(errno));
 171                         _exit(1);
 172                 }
 173
 174                 log_info("Successfully spawned crash shell as pid %lu.", (unsigned long) pid);
 175         }
 176
 177         log_info("Freezing execution.");
 178         freeze();
 179 }
 180
 181 static void install_crash_handler(void) {
 182         struct sigaction sa;
 183
 184         zero(sa);
 185
 186         sa.sa_handler = crash;
 187         sa.sa_flags = SA_NODEFER;
 188
 189         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
 190 }
 191
 192 static int console_setup(bool do_reset) {
 193         int tty_fd, r;
 194
 195         /* If we are init, we connect stdin/stdout/stderr to /dev/null
 196          * and make sure we don't have a controlling tty. */
 197
 198         release_terminal();
 199
 200         if (!do_reset)
 201                 return 0;
 202
 203         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
 204                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 205                 return -tty_fd;
 206         }
 207
 208         if ((r = reset_terminal_fd(tty_fd)) < 0)
 209                 log_error("Failed to reset /dev/console: %s", strerror(-r));
 210
 211         close_nointr_nofail(tty_fd);
 212         return r;
 213 }
 214
 215 static int set_default_unit(const char *u) {
 216         char *c;
 217
 218         assert(u);
 219
 220         if (!(c = strdup(u)))
 221                 return -ENOMEM;
 222
 223         free(arg_default_unit);
 224         arg_default_unit = c;
 225         return 0;
 226 }
 227
 228 static int parse_proc_cmdline_word(const char *word) {
 229
 230         static const char * const rlmap[] = {
 231                 "emergency", SPECIAL_EMERGENCY_TARGET,
 232                 "-b",        SPECIAL_EMERGENCY_TARGET,
 233                 "single",    SPECIAL_RESCUE_TARGET,
 234                 "-s",        SPECIAL_RESCUE_TARGET,
 235                 "s",         SPECIAL_RESCUE_TARGET,
 236                 "S",         SPECIAL_RESCUE_TARGET,
 237                 "1",         SPECIAL_RESCUE_TARGET,
 238                 "2",         SPECIAL_RUNLEVEL2_TARGET,
 239                 "3",         SPECIAL_RUNLEVEL3_TARGET,
 240                 "4",         SPECIAL_RUNLEVEL4_TARGET,
 241                 "5",         SPECIAL_RUNLEVEL5_TARGET,
 242         };
 243
 244         assert(word);
 245
 246         if (startswith(word, "systemd.unit="))
 247                 return set_default_unit(word + 13);
 248
 249         else if (startswith(word, "systemd.log_target=")) {
 250
 251                 if (log_set_target_from_string(word + 19) < 0)
 252                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 253
 254         } else if (startswith(word, "systemd.log_level=")) {
 255
 256                 if (log_set_max_level_from_string(word + 18) < 0)
 257                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 258
 259         } else if (startswith(word, "systemd.log_color=")) {
 260
 261                 if (log_show_color_from_string(word + 18) < 0)
 262                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
 263
 264         } else if (startswith(word, "systemd.log_location=")) {
 265
 266                 if (log_show_location_from_string(word + 21) < 0)
 267                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
 268
 269         } else if (startswith(word, "systemd.dump_core=")) {
 270                 int r;
 271
 272                 if ((r = parse_boolean(word + 18)) < 0)
 273                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 274                 else
 275                         arg_dump_core = r;
 276
 277         } else if (startswith(word, "systemd.crash_shell=")) {
 278                 int r;
 279
 280                 if ((r = parse_boolean(word + 20)) < 0)
 281                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 282                 else
 283                         arg_crash_shell = r;
 284
 285         } else if (startswith(word, "systemd.confirm_spawn=")) {
 286                 int r;
 287
 288                 if ((r = parse_boolean(word + 22)) < 0)
 289                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 290                 else
 291                         arg_confirm_spawn = r;
 292
 293         } else if (startswith(word, "systemd.crash_chvt=")) {
 294                 int k;
 295
 296                 if (safe_atoi(word + 19, &k) < 0)
 297                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 298                 else
 299                         arg_crash_chvt = k;
 300
 301         } else if (startswith(word, "systemd.show_status=")) {
 302                 int r;
 303
 304                 if ((r = parse_boolean(word + 20)) < 0)
 305                         log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
 306                 else
 307                         arg_show_status = r;
 308         } else if (startswith(word, "systemd.default_standard_output=")) {
 309                 int r;
 310
 311                 if ((r = exec_output_from_string(word + 32)) < 0)
 312                         log_warning("Failed to parse default standard output switch %s, Ignoring.", word + 32);
 313                 else
 314                         arg_default_std_output = r;
 315         } else if (startswith(word, "systemd.default_standard_error=")) {
 316                 int r;
 317
 318                 if ((r = exec_output_from_string(word + 31)) < 0)
 319                         log_warning("Failed to parse default standard error switch %s, Ignoring.", word + 31);
 320                 else
 321                         arg_default_std_error = r;
 322 #ifdef HAVE_SYSV_COMPAT
 323         } else if (startswith(word, "systemd.sysv_console=")) {
 324                 int r;
 325
 326                 if ((r = parse_boolean(word + 21)) < 0)
 327                         log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20);
 328                 else
 329                         arg_sysv_console = r;
 330 #endif
 331
 332         } else if (startswith(word, "systemd.")) {
 333
 334                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 335
 336                 log_info("Supported kernel switches:\n"
 337                          "systemd.unit=UNIT                        Default unit to start\n"
 338                          "systemd.dump_core=0|1                    Dump core on crash\n"
 339                          "systemd.crash_shell=0|1                  Run shell on crash\n"
 340                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 341                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
 342                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n"
 343 #ifdef HAVE_SYSV_COMPAT
 344                          "systemd.sysv_console=0|1                 Connect output of SysV scripts to console\n"
 345 #endif
 346                          "systemd.log_target=console|kmsg|syslog|syslog-or-kmsg|null\n"
 347                          "                                         Log target\n"
 348                          "systemd.log_level=LEVEL                  Log level\n"
 349                          "systemd.log_color=0|1                    Highlight important log messages\n"
 350                          "systemd.log_location=0|1                 Include code location in log messages\n"
 351                          "systemd.default_standard_output=null|tty|syslog|syslog+console|kmsg|kmsg+console\n"
 352                          "                                         Set default log output for services\n"
 353                          "systemd.default_standard_error=null|tty|syslog|syslog+console|kmsg|kmsg+console\n"
 354                          "                                         Set default log error output for services\n");
 355
 356         } else if (streq(word, "quiet")) {
 357                 arg_show_status = false;
 358 #ifdef HAVE_SYSV_COMPAT
 359                 arg_sysv_console = false;
 360 #endif
 361         } else {
 362                 unsigned i;
 363
 364                 /* SysV compatibility */
 365                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 366                         if (streq(word, rlmap[i]))
 367                                 return set_default_unit(rlmap[i+1]);
 368         }
 369
 370         return 0;
 371 }
 372
 373 static int config_parse_level2(
 374                 const char *filename,
 375                 unsigned line,
 376                 const char *section,
 377                 const char *lvalue,
 378                 int ltype,
 379                 const char *rvalue,
 380                 void *data,
 381                 void *userdata) {
 382
 383         assert(filename);
 384         assert(lvalue);
 385         assert(rvalue);
 386
 387         log_set_max_level_from_string(rvalue);
 388         return 0;
 389 }
 390
 391 static int config_parse_target(
 392                 const char *filename,
 393                 unsigned line,
 394                 const char *section,
 395                 const char *lvalue,
 396                 int ltype,
 397                 const char *rvalue,
 398                 void *data,
 399                 void *userdata) {
 400
 401         assert(filename);
 402         assert(lvalue);
 403         assert(rvalue);
 404
 405         log_set_target_from_string(rvalue);
 406         return 0;
 407 }
 408
 409 static int config_parse_color(
 410                 const char *filename,
 411                 unsigned line,
 412                 const char *section,
 413                 const char *lvalue,
 414                 int ltype,
 415                 const char *rvalue,
 416                 void *data,
 417                 void *userdata) {
 418
 419         assert(filename);
 420         assert(lvalue);
 421         assert(rvalue);
 422
 423         log_show_color_from_string(rvalue);
 424         return 0;
 425 }
 426
 427 static int config_parse_location(
 428                 const char *filename,
 429                 unsigned line,
 430                 const char *section,
 431                 const char *lvalue,
 432                 int ltype,
 433                 const char *rvalue,
 434                 void *data,
 435                 void *userdata) {
 436
 437         assert(filename);
 438         assert(lvalue);
 439         assert(rvalue);
 440
 441         log_show_location_from_string(rvalue);
 442         return 0;
 443 }
 444
 445 static int config_parse_cpu_affinity2(
 446                 const char *filename,
 447                 unsigned line,
 448                 const char *section,
 449                 const char *lvalue,
 450                 int ltype,
 451                 const char *rvalue,
 452                 void *data,
 453                 void *userdata) {
 454
 455         char *w;
 456         size_t l;
 457         char *state;
 458         cpu_set_t *c = NULL;
 459         unsigned ncpus = 0;
 460
 461         assert(filename);
 462         assert(lvalue);
 463         assert(rvalue);
 464
 465         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 466                 char *t;
 467                 int r;
 468                 unsigned cpu;
 469
 470                 if (!(t = strndup(w, l)))
 471                         return -ENOMEM;
 472
 473                 r = safe_atou(t, &cpu);
 474                 free(t);
 475
 476                 if (!c)
 477                         if (!(c = cpu_set_malloc(&ncpus)))
 478                                 return -ENOMEM;
 479
 480                 if (r < 0 || cpu >= ncpus) {
 481                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 482                         CPU_FREE(c);
 483                         return -EBADMSG;
 484                 }
 485
 486                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
 487         }
 488
 489         if (c) {
 490                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
 491                         log_warning("Failed to set CPU affinity: %m");
 492
 493                 CPU_FREE(c);
 494         }
 495
 496         return 0;
 497 }
 498
 499 static void strv_free_free(char ***l) {
 500         char ***i;
 501
 502         if (!l)
 503                 return;
 504
 505         for (i = l; *i; i++)
 506                 strv_free(*i);
 507
 508         free(l);
 509 }
 510
 511 static void free_join_controllers(void) {
 512         if (!arg_join_controllers)
 513                 return;
 514
 515         strv_free_free(arg_join_controllers);
 516         arg_join_controllers = NULL;
 517 }
 518
 519 static int config_parse_join_controllers(
 520                 const char *filename,
 521                 unsigned line,
 522                 const char *section,
 523                 const char *lvalue,
 524                 int ltype,
 525                 const char *rvalue,
 526                 void *data,
 527                 void *userdata) {
 528
 529         unsigned n = 0;
 530         char *state, *w;
 531         size_t length;
 532
 533         assert(filename);
 534         assert(lvalue);
 535         assert(rvalue);
 536
 537         free_join_controllers();
 538
 539         FOREACH_WORD_QUOTED(w, length, rvalue, state) {
 540                 char *s, **l;
 541
 542                 s = strndup(w, length);
 543                 if (!s)
 544                         return -ENOMEM;
 545
 546                 l = strv_split(s, ",");
 547                 free(s);
 548
 549                 strv_uniq(l);
 550
 551                 if (strv_length(l) <= 1) {
 552                         strv_free(l);
 553                         continue;
 554                 }
 555
 556                 if (!arg_join_controllers) {
 557                         arg_join_controllers = new(char**, 2);
 558                         if (!arg_join_controllers) {
 559                                 strv_free(l);
 560                                 return -ENOMEM;
 561                         }
 562
 563                         arg_join_controllers[0] = l;
 564                         arg_join_controllers[1] = NULL;
 565
 566                         n = 1;
 567                 } else {
 568                         char ***a;
 569                         char ***t;
 570
 571                         t = new0(char**, n+2);
 572                         if (!t) {
 573                                 strv_free(l);
 574                                 return -ENOMEM;
 575                         }
 576
 577                         n = 0;
 578
 579                         for (a = arg_join_controllers; *a; a++) {
 580
 581                                 if (strv_overlap(*a, l)) {
 582                                         char **c;
 583
 584                                         c = strv_merge(*a, l);
 585                                         if (!c) {
 586                                                 strv_free(l);
 587                                                 strv_free_free(t);
 588                                                 return -ENOMEM;
 589                                         }
 590
 591                                         strv_free(l);
 592                                         l = c;
 593                                 } else {
 594                                         char **c;
 595
 596                                         c = strv_copy(*a);
 597                                         if (!c) {
 598                                                 strv_free(l);
 599                                                 strv_free_free(t);
 600                                                 return -ENOMEM;
 601                                         }
 602
 603                                         t[n++] = c;
 604                                 }
 605                         }
 606
 607                         t[n++] = strv_uniq(l);
 608
 609                         strv_free_free(arg_join_controllers);
 610                         arg_join_controllers = t;
 611                 }
 612         }
 613
 614         return 0;
 615 }
 616
 617 static int parse_config_file(void) {
 618
 619         const ConfigTableItem items[] = {
 620                 { "Manager", "LogLevel",              config_parse_level2,       0, NULL                     },
 621                 { "Manager", "LogTarget",             config_parse_target,       0, NULL                     },
 622                 { "Manager", "LogColor",              config_parse_color,        0, NULL                     },
 623                 { "Manager", "LogLocation",           config_parse_location,     0, NULL                     },
 624                 { "Manager", "DumpCore",              config_parse_bool,         0, &arg_dump_core           },
 625                 { "Manager", "CrashShell",            config_parse_bool,         0, &arg_crash_shell         },
 626                 { "Manager", "ShowStatus",            config_parse_bool,         0, &arg_show_status         },
 627 #ifdef HAVE_SYSV_COMPAT
 628                 { "Manager", "SysVConsole",           config_parse_bool,         0, &arg_sysv_console        },
 629 #endif
 630                 { "Manager", "CrashChVT",             config_parse_int,          0, &arg_crash_chvt          },
 631                 { "Manager", "CPUAffinity",           config_parse_cpu_affinity2, 0, NULL                    },
 632                 { "Manager", "MountAuto",             config_parse_bool,         0, &arg_mount_auto          },
 633                 { "Manager", "SwapAuto",              config_parse_bool,         0, &arg_swap_auto           },
 634                 { "Manager", "DefaultControllers",    config_parse_strv,         0, &arg_default_controllers },
 635                 { "Manager", "DefaultStandardOutput", config_parse_output,       0, &arg_default_std_output  },
 636                 { "Manager", "DefaultStandardError",  config_parse_output,       0, &arg_default_std_error   },
 637                 { "Manager", "JoinControllers",       config_parse_join_controllers, 0, &arg_join_controllers },
 638                 { NULL, NULL, NULL, 0, NULL }
 639         };
 640
 641         FILE *f;
 642         const char *fn;
 643         int r;
 644
 645         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : USER_CONFIG_FILE;
 646         f = fopen(fn, "re");
 647         if (!f) {
 648                 if (errno == ENOENT)
 649                         return 0;
 650
 651                 log_warning("Failed to open configuration file '%s': %m", fn);
 652                 return 0;
 653         }
 654
 655         r = config_parse(fn, f, "Manager\0", config_item_table_lookup, (void*) items, false, NULL);
 656         if (r < 0)
 657                 log_warning("Failed to parse configuration file: %s", strerror(-r));
 658
 659         fclose(f);
 660
 661         return 0;
 662 }
 663
 664 static int parse_proc_cmdline(void) {
 665         char *line, *w, *state;
 666         int r;
 667         size_t l;
 668
 669         /* Don't read /proc/cmdline if we are in a container, since
 670          * that is only relevant for the host system */
 671         if (detect_container(NULL) > 0)
 672                 return 0;
 673
 674         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 675                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 676                 return 0;
 677         }
 678
 679         FOREACH_WORD_QUOTED(w, l, line, state) {
 680                 char *word;
 681
 682                 if (!(word = strndup(w, l))) {
 683                         r = -ENOMEM;
 684                         goto finish;
 685                 }
 686
 687                 r = parse_proc_cmdline_word(word);
 688                 free(word);
 689
 690                 if (r < 0)
 691                         goto finish;
 692         }
 693
 694         r = 0;
 695
 696 finish:
 697         free(line);
 698         return r;
 699 }
 700
 701 static int parse_argv(int argc, char *argv[]) {
 702
 703         enum {
 704                 ARG_LOG_LEVEL = 0x100,
 705                 ARG_LOG_TARGET,
 706                 ARG_LOG_COLOR,
 707                 ARG_LOG_LOCATION,
 708                 ARG_UNIT,
 709                 ARG_SYSTEM,
 710                 ARG_USER,
 711                 ARG_TEST,
 712                 ARG_DUMP_CONFIGURATION_ITEMS,
 713                 ARG_DUMP_CORE,
 714                 ARG_CRASH_SHELL,
 715                 ARG_CONFIRM_SPAWN,
 716                 ARG_SHOW_STATUS,
 717                 ARG_SYSV_CONSOLE,
 718                 ARG_DESERIALIZE,
 719                 ARG_INTROSPECT,
 720                 ARG_DEFAULT_STD_OUTPUT,
 721                 ARG_DEFAULT_STD_ERROR
 722         };
 723
 724         static const struct option options[] = {
 725                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 726                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 727                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 728                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 729                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 730                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
 731                 { "user",                     no_argument,       NULL, ARG_USER                     },
 732                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 733                 { "help",                     no_argument,       NULL, 'h'                          },
 734                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 735                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 736                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 737                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 738                 { "show-status",              optional_argument, NULL, ARG_SHOW_STATUS              },
 739 #ifdef HAVE_SYSV_COMPAT
 740                 { "sysv-console",             optional_argument, NULL, ARG_SYSV_CONSOLE             },
 741 #endif
 742                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 743                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 744                 { "default-standard-output",  required_argument, NULL, ARG_DEFAULT_STD_OUTPUT,      },
 745                 { "default-standard-error",   required_argument, NULL, ARG_DEFAULT_STD_ERROR,       },
 746                 { NULL,                       0,                 NULL, 0                            }
 747         };
 748
 749         int c, r;
 750
 751         assert(argc >= 1);
 752         assert(argv);
 753
 754         if (getpid() == 1)
 755                 opterr = 0;
 756
 757         while ((c = getopt_long(argc, argv, "hDbsz:", options, NULL)) >= 0)
 758
 759                 switch (c) {
 760
 761                 case ARG_LOG_LEVEL:
 762                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 763                                 log_error("Failed to parse log level %s.", optarg);
 764                                 return r;
 765                         }
 766
 767                         break;
 768
 769                 case ARG_LOG_TARGET:
 770
 771                         if ((r = log_set_target_from_string(optarg)) < 0) {
 772                                 log_error("Failed to parse log target %s.", optarg);
 773                                 return r;
 774                         }
 775
 776                         break;
 777
 778                 case ARG_LOG_COLOR:
 779
 780                         if (optarg) {
 781                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 782                                         log_error("Failed to parse log color setting %s.", optarg);
 783                                         return r;
 784                                 }
 785                         } else
 786                                 log_show_color(true);
 787
 788                         break;
 789
 790                 case ARG_LOG_LOCATION:
 791
 792                         if (optarg) {
 793                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 794                                         log_error("Failed to parse log location setting %s.", optarg);
 795                                         return r;
 796                                 }
 797                         } else
 798                                 log_show_location(true);
 799
 800                         break;
 801
 802                 case ARG_DEFAULT_STD_OUTPUT:
 803
 804                         if ((r = exec_output_from_string(optarg)) < 0) {
 805                                 log_error("Failed to parse default standard output setting %s.", optarg);
 806                                 return r;
 807                         } else
 808                                 arg_default_std_output = r;
 809                         break;
 810
 811                 case ARG_DEFAULT_STD_ERROR:
 812
 813                         if ((r = exec_output_from_string(optarg)) < 0) {
 814                                 log_error("Failed to parse default standard error output setting %s.", optarg);
 815                                 return r;
 816                         } else
 817                                 arg_default_std_error = r;
 818                         break;
 819
 820                 case ARG_UNIT:
 821
 822                         if ((r = set_default_unit(optarg)) < 0) {
 823                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 824                                 return r;
 825                         }
 826
 827                         break;
 828
 829                 case ARG_SYSTEM:
 830                         arg_running_as = MANAGER_SYSTEM;
 831                         break;
 832
 833                 case ARG_USER:
 834                         arg_running_as = MANAGER_USER;
 835                         break;
 836
 837                 case ARG_TEST:
 838                         arg_action = ACTION_TEST;
 839                         break;
 840
 841                 case ARG_DUMP_CONFIGURATION_ITEMS:
 842                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 843                         break;
 844
 845                 case ARG_DUMP_CORE:
 846                         arg_dump_core = true;
 847                         break;
 848
 849                 case ARG_CRASH_SHELL:
 850                         arg_crash_shell = true;
 851                         break;
 852
 853                 case ARG_CONFIRM_SPAWN:
 854                         arg_confirm_spawn = true;
 855                         break;
 856
 857                 case ARG_SHOW_STATUS:
 858
 859                         if (optarg) {
 860                                 if ((r = parse_boolean(optarg)) < 0) {
 861                                         log_error("Failed to show status boolean %s.", optarg);
 862                                         return r;
 863                                 }
 864                                 arg_show_status = r;
 865                         } else
 866                                 arg_show_status = true;
 867                         break;
 868 #ifdef HAVE_SYSV_COMPAT
 869                 case ARG_SYSV_CONSOLE:
 870
 871                         if (optarg) {
 872                                 if ((r = parse_boolean(optarg)) < 0) {
 873                                         log_error("Failed to SysV console boolean %s.", optarg);
 874                                         return r;
 875                                 }
 876                                 arg_sysv_console = r;
 877                         } else
 878                                 arg_sysv_console = true;
 879                         break;
 880 #endif
 881
 882                 case ARG_DESERIALIZE: {
 883                         int fd;
 884                         FILE *f;
 885
 886                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 887                                 log_error("Failed to parse deserialize option %s.", optarg);
 888                                 return r;
 889                         }
 890
 891                         if (!(f = fdopen(fd, "r"))) {
 892                                 log_error("Failed to open serialization fd: %m");
 893                                 return r;
 894                         }
 895
 896                         if (serialization)
 897                                 fclose(serialization);
 898
 899                         serialization = f;
 900
 901                         break;
 902                 }
 903
 904                 case ARG_INTROSPECT: {
 905                         const char * const * i = NULL;
 906
 907                         for (i = bus_interface_table; *i; i += 2)
 908                                 if (!optarg || streq(i[0], optarg)) {
 909                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 910                                               "<node>\n", stdout);
 911                                         fputs(i[1], stdout);
 912                                         fputs("</node>\n", stdout);
 913
 914                                         if (optarg)
 915                                                 break;
 916                                 }
 917
 918                         if (!i[0] && optarg)
 919                                 log_error("Unknown interface %s.", optarg);
 920
 921                         arg_action = ACTION_DONE;
 922                         break;
 923                 }
 924
 925                 case 'h':
 926                         arg_action = ACTION_HELP;
 927                         break;
 928
 929                 case 'D':
 930                         log_set_max_level(LOG_DEBUG);
 931                         break;
 932
 933                 case 'b':
 934                 case 's':
 935                 case 'z':
 936                         /* Just to eat away the sysvinit kernel
 937                          * cmdline args without getopt() error
 938                          * messages that we'll parse in
 939                          * parse_proc_cmdline_word() or ignore. */
 940
 941                 case '?':
 942                 default:
 943                         if (getpid() != 1) {
 944                                 log_error("Unknown option code %c", c);
 945                                 return -EINVAL;
 946                         }
 947
 948                         break;
 949                 }
 950
 951         if (optind < argc && getpid() != 1) {
 952                 /* Hmm, when we aren't run as init system
 953                  * let's complain about excess arguments */
 954
 955                 log_error("Excess arguments.");
 956                 return -EINVAL;
 957         }
 958
 959         if (detect_container(NULL) > 0) {
 960                 char **a;
 961
 962                 /* All /proc/cmdline arguments the kernel didn't
 963                  * understand it passed to us. We're not really
 964                  * interested in that usually since /proc/cmdline is
 965                  * more interesting and complete. With one exception:
 966                  * if we are run in a container /proc/cmdline is not
 967                  * relevant for the container, hence we rely on argv[]
 968                  * instead. */
 969
 970                 for (a = argv; a < argv + argc; a++)
 971                         if ((r = parse_proc_cmdline_word(*a)) < 0)
 972                                 return r;
 973         }
 974
 975         return 0;
 976 }
 977
 978 static int help(void) {
 979
 980         printf("%s [OPTIONS...]\n\n"
 981                "Starts up and maintains the system or user services.\n\n"
 982                "  -h --help                      Show this help\n"
 983                "     --test                      Determine startup sequence, dump it and exit\n"
 984                "     --dump-configuration-items  Dump understood unit configuration items\n"
 985                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 986                "     --unit=UNIT                 Set default unit\n"
 987                "     --system                    Run a system instance, even if PID != 1\n"
 988                "     --user                      Run a user instance\n"
 989                "     --dump-core                 Dump core on crash\n"
 990                "     --crash-shell               Run shell on crash\n"
 991                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 992                "     --show-status[=0|1]         Show status updates on the console during bootup\n"
 993 #ifdef HAVE_SYSV_COMPAT
 994                "     --sysv-console[=0|1]        Connect output of SysV scripts to console\n"
 995 #endif
 996                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 997                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
 998                "     --log-color[=0|1]           Highlight important log messages\n"
 999                "     --log-location[=0|1]        Include code location in log messages\n"
1000                "     --default-standard-output=  Set default standard output for services\n"
1001                "     --default-standard-error=   Set default standard error output for services\n",
1002                program_invocation_short_name);
1003
1004         return 0;
1005 }
1006
1007 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
1008         FILE *f = NULL;
1009         FDSet *fds = NULL;
1010         int r;
1011
1012         assert(m);
1013         assert(_f);
1014         assert(_fds);
1015
1016         /* Make sure nothing is really destructed when we shut down */
1017         m->n_reloading ++;
1018
1019         if ((r = manager_open_serialization(m, &f)) < 0) {
1020                 log_error("Failed to create serialization file: %s", strerror(-r));
1021                 goto fail;
1022         }
1023
1024         if (!(fds = fdset_new())) {
1025                 r = -ENOMEM;
1026                 log_error("Failed to allocate fd set: %s", strerror(-r));
1027                 goto fail;
1028         }
1029
1030         if ((r = manager_serialize(m, f, fds)) < 0) {
1031                 log_error("Failed to serialize state: %s", strerror(-r));
1032                 goto fail;
1033         }
1034
1035         if (fseeko(f, 0, SEEK_SET) < 0) {
1036                 log_error("Failed to rewind serialization fd: %m");
1037                 goto fail;
1038         }
1039
1040         if ((r = fd_cloexec(fileno(f), false)) < 0) {
1041                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
1042                 goto fail;
1043         }
1044
1045         if ((r = fdset_cloexec(fds, false)) < 0) {
1046                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
1047                 goto fail;
1048         }
1049
1050         *_f = f;
1051         *_fds = fds;
1052
1053         return 0;
1054
1055 fail:
1056         fdset_free(fds);
1057
1058         if (f)
1059                 fclose(f);
1060
1061         return r;
1062 }
1063
1064 static struct dual_timestamp* parse_initrd_timestamp(struct dual_timestamp *t) {
1065         const char *e;
1066         unsigned long long a, b;
1067
1068         assert(t);
1069
1070         if (!(e = getenv("RD_TIMESTAMP")))
1071                 return NULL;
1072
1073         if (sscanf(e, "%llu %llu", &a, &b) != 2)
1074                 return NULL;
1075
1076         t->realtime = (usec_t) a;
1077         t->monotonic = (usec_t) b;
1078
1079         return t;
1080 }
1081
1082 static void test_mtab(void) {
1083         char *p;
1084
1085         /* Check that /etc/mtab is a symlink */
1086
1087         if (readlink_malloc("/etc/mtab", &p) >= 0) {
1088                 bool b;
1089
1090                 b = streq(p, "/proc/self/mounts") || streq(p, "/proc/mounts");
1091                 free(p);
1092
1093                 if (b)
1094                         return;
1095         }
1096
1097         log_warning("/etc/mtab is not a symlink or not pointing to /proc/self/mounts. "
1098                     "This is not supported anymore. "
1099                     "Please make sure to replace this file by a symlink to avoid incorrect or misleading mount(8) output.");
1100 }
1101
1102 static void test_usr(void) {
1103
1104         /* Check that /usr is not a separate fs */
1105
1106         if (dir_is_empty("/usr") <= 0)
1107                 return;
1108
1109         log_warning("/usr appears to be on its own filesytem and is not already mounted. This is not a supported setup. "
1110                     "Some things will probably break (sometimes even silently) in mysterious ways. "
1111                     "Consult http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken for more information.");
1112 }
1113
1114 static void test_cgroups(void) {
1115
1116         if (access("/proc/cgroups", F_OK) >= 0)
1117                 return;
1118
1119         log_warning("CONFIG_CGROUPS was not set when your kernel was compiled. "
1120                     "Systems without control groups are not supported. "
1121                     "We will now sleep for 10s, and then continue boot-up. "
1122                     "Expect breakage and please do not file bugs. "
1123                     "Instead fix your kernel and enable CONFIG_CGROUPS." );
1124
1125         sleep(10);
1126 }
1127
1128 int main(int argc, char *argv[]) {
1129         Manager *m = NULL;
1130         int r, retval = EXIT_FAILURE;
1131         usec_t before_startup, after_startup;
1132         char timespan[FORMAT_TIMESPAN_MAX];
1133         FDSet *fds = NULL;
1134         bool reexecute = false;
1135         const char *shutdown_verb = NULL;
1136         dual_timestamp initrd_timestamp = { 0ULL, 0ULL };
1137         char systemd[] = "systemd";
1138         bool is_reexec = false;
1139         int j;
1140         bool loaded_policy = false;
1141
1142 #ifdef HAVE_SYSV_COMPAT
1143         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
1144                 /* This is compatibility support for SysV, where
1145                  * calling init as a user is identical to telinit. */
1146
1147                 errno = -ENOENT;
1148                 execv(SYSTEMCTL_BINARY_PATH, argv);
1149                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
1150                 return 1;
1151         }
1152 #endif
1153
1154         /* Determine if this is a reexecution or normal bootup. We do
1155          * the full command line parsing much later, so let's just
1156          * have a quick peek here. */
1157
1158         for (j = 1; j < argc; j++)
1159                 if (streq(argv[j], "--deserialize")) {
1160                         is_reexec = true;
1161                         break;
1162                 }
1163
1164         /* If we get started via the /sbin/init symlink then we are
1165            called 'init'. After a subsequent reexecution we are then
1166            called 'systemd'. That is confusing, hence let's call us
1167            systemd right-away. */
1168
1169         program_invocation_short_name = systemd;
1170         prctl(PR_SET_NAME, systemd);
1171         saved_argv = argv;
1172         saved_argc = argc;
1173
1174         log_show_color(isatty(STDERR_FILENO) > 0);
1175         log_show_location(false);
1176         log_set_max_level(LOG_INFO);
1177
1178         if (getpid() == 1) {
1179                 arg_running_as = MANAGER_SYSTEM;
1180                 log_set_target(detect_container(NULL) > 0 ? LOG_TARGET_CONSOLE : LOG_TARGET_SYSLOG_OR_KMSG);
1181
1182                 if (!is_reexec)
1183                         if (selinux_setup(&loaded_policy) < 0)
1184                                 goto finish;
1185
1186                 log_open();
1187
1188                 if (label_init() < 0)
1189                         goto finish;
1190
1191                 if (!is_reexec)
1192                         if (hwclock_is_localtime() > 0) {
1193                                 int min;
1194
1195                                 r = hwclock_apply_localtime_delta(&min);
1196                                 if (r < 0)
1197                                         log_error("Failed to apply local time delta, ignoring: %s", strerror(-r));
1198                                 else
1199                                         log_info("RTC configured in localtime, applying delta of %i minutes to system time.", min);
1200                         }
1201
1202         } else {
1203                 arg_running_as = MANAGER_USER;
1204                 log_set_target(LOG_TARGET_AUTO);
1205                 log_open();
1206         }
1207
1208         /* Initialize default unit */
1209         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
1210                 goto finish;
1211
1212         /* By default, mount "cpu" and "cpuacct" together */
1213         arg_join_controllers = new(char**, 2);
1214         if (!arg_join_controllers)
1215                 goto finish;
1216
1217         arg_join_controllers[0] = strv_new("cpu", "cpuacct", NULL);
1218         arg_join_controllers[1] = NULL;
1219
1220         if (!arg_join_controllers[0])
1221                 goto finish;
1222
1223         /* Mount /proc, /sys and friends, so that /proc/cmdline and
1224          * /proc/$PID/fd is available. */
1225         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS")) {
1226                 r = mount_setup(loaded_policy);
1227                 if (r < 0)
1228                         goto finish;
1229         }
1230
1231         /* Reset all signal handlers. */
1232         assert_se(reset_all_signal_handlers() == 0);
1233
1234         /* If we are init, we can block sigkill. Yay. */
1235         ignore_signals(SIGNALS_IGNORE, -1);
1236
1237         if (parse_config_file() < 0)
1238                 goto finish;
1239
1240         if (arg_running_as == MANAGER_SYSTEM)
1241                 if (parse_proc_cmdline() < 0)
1242                         goto finish;
1243
1244         log_parse_environment();
1245
1246         if (parse_argv(argc, argv) < 0)
1247                 goto finish;
1248
1249         if (arg_action == ACTION_TEST && geteuid() == 0) {
1250                 log_error("Don't run test mode as root.");
1251                 goto finish;
1252         }
1253
1254         if (arg_running_as == MANAGER_SYSTEM &&
1255             arg_action == ACTION_RUN &&
1256             running_in_chroot() > 0) {
1257                 log_error("Cannot be run in a chroot() environment.");
1258                 goto finish;
1259         }
1260
1261         if (arg_action == ACTION_HELP) {
1262                 retval = help();
1263                 goto finish;
1264         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
1265                 unit_dump_config_items(stdout);
1266                 retval = EXIT_SUCCESS;
1267                 goto finish;
1268         } else if (arg_action == ACTION_DONE) {
1269                 retval = EXIT_SUCCESS;
1270                 goto finish;
1271         }
1272
1273         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
1274
1275         /* Close logging fds, in order not to confuse fdset below */
1276         log_close();
1277
1278         /* Remember open file descriptors for later deserialization */
1279         if (serialization) {
1280                 if ((r = fdset_new_fill(&fds)) < 0) {
1281                         log_error("Failed to allocate fd set: %s", strerror(-r));
1282                         goto finish;
1283                 }
1284
1285                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
1286         } else
1287                 close_all_fds(NULL, 0);
1288
1289         /* Set up PATH unless it is already set */
1290         setenv("PATH",
1291                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
1292                arg_running_as == MANAGER_SYSTEM);
1293
1294         if (arg_running_as == MANAGER_SYSTEM) {
1295                 /* Parse the data passed to us by the initrd and unset it */
1296                 parse_initrd_timestamp(&initrd_timestamp);
1297                 filter_environ("RD_");
1298
1299                 /* Unset some environment variables passed in from the
1300                  * kernel that don't really make sense for us. */
1301                 unsetenv("HOME");
1302                 unsetenv("TERM");
1303
1304                 /* All other variables are left as is, so that clients
1305                  * can still read them via /proc/1/environ */
1306         }
1307
1308         /* Move out of the way, so that we won't block unmounts */
1309         assert_se(chdir("/")  == 0);
1310
1311         if (arg_running_as == MANAGER_SYSTEM) {
1312                 /* Become a session leader if we aren't one yet. */
1313                 setsid();
1314
1315                 /* Disable the umask logic */
1316                 umask(0);
1317         }
1318
1319         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
1320         dbus_connection_set_change_sigpipe(FALSE);
1321
1322         /* Reset the console, but only if this is really init and we
1323          * are freshly booted */
1324         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
1325                 console_setup(getpid() == 1 && !is_reexec);
1326                 make_null_stdio();
1327         }
1328
1329         /* Open the logging devices, if possible and necessary */
1330         log_open();
1331
1332         /* Make sure we leave a core dump without panicing the
1333          * kernel. */
1334         if (getpid() == 1)
1335                 install_crash_handler();
1336
1337         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS")) {
1338                 r = mount_cgroup_controllers(arg_join_controllers);
1339                 if (r < 0)
1340                         goto finish;
1341         }
1342
1343         log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,
1344                  PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES "; " DISTRIBUTION ")", manager_running_as_to_string(arg_running_as));
1345
1346         if (arg_running_as == MANAGER_SYSTEM && !is_reexec) {
1347                 locale_setup();
1348
1349                 if (arg_show_status || plymouth_running())
1350                         status_welcome();
1351
1352                 kmod_setup();
1353                 hostname_setup();
1354                 machine_id_setup();
1355                 loopback_setup();
1356
1357                 test_mtab();
1358                 test_usr();
1359                 test_cgroups();
1360         }
1361
1362         if ((r = manager_new(arg_running_as, &m)) < 0) {
1363                 log_error("Failed to allocate manager object: %s", strerror(-r));
1364                 goto finish;
1365         }
1366
1367         m->confirm_spawn = arg_confirm_spawn;
1368 #ifdef HAVE_SYSV_COMPAT
1369         m->sysv_console = arg_sysv_console;
1370 #endif
1371         m->mount_auto = arg_mount_auto;
1372         m->swap_auto = arg_swap_auto;
1373         m->default_std_output = arg_default_std_output;
1374         m->default_std_error = arg_default_std_error;
1375
1376         if (dual_timestamp_is_set(&initrd_timestamp))
1377                 m->initrd_timestamp = initrd_timestamp;
1378
1379         if (arg_default_controllers)
1380                 manager_set_default_controllers(m, arg_default_controllers);
1381
1382         manager_set_show_status(m, arg_show_status);
1383
1384         before_startup = now(CLOCK_MONOTONIC);
1385
1386         if ((r = manager_startup(m, serialization, fds)) < 0)
1387                 log_error("Failed to fully start up daemon: %s", strerror(-r));
1388
1389         if (fds) {
1390                 /* This will close all file descriptors that were opened, but
1391                  * not claimed by any unit. */
1392
1393                 fdset_free(fds);
1394                 fds = NULL;
1395         }
1396
1397         if (serialization) {
1398                 fclose(serialization);
1399                 serialization = NULL;
1400         } else {
1401                 DBusError error;
1402                 Unit *target = NULL;
1403
1404                 dbus_error_init(&error);
1405
1406                 log_debug("Activating default unit: %s", arg_default_unit);
1407
1408                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1409                         log_error("Failed to load default target: %s", bus_error(&error, r));
1410                         dbus_error_free(&error);
1411                 } else if (target->meta.load_state == UNIT_ERROR)
1412                         log_error("Failed to load default target: %s", strerror(-target->meta.load_error));
1413                 else if (target->meta.load_state == UNIT_MASKED)
1414                         log_error("Default target masked.");
1415
1416                 if (!target || target->meta.load_state != UNIT_LOADED) {
1417                         log_info("Trying to load rescue target...");
1418
1419                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1420                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1421                                 dbus_error_free(&error);
1422                                 goto finish;
1423                         } else if (target->meta.load_state == UNIT_ERROR) {
1424                                 log_error("Failed to load rescue target: %s", strerror(-target->meta.load_error));
1425                                 goto finish;
1426                         } else if (target->meta.load_state == UNIT_MASKED) {
1427                                 log_error("Rescue target masked.");
1428                                 goto finish;
1429                         }
1430                 }
1431
1432                 assert(target->meta.load_state == UNIT_LOADED);
1433
1434                 if (arg_action == ACTION_TEST) {
1435                         printf("-> By units:\n");
1436                         manager_dump_units(m, stdout, "\t");
1437                 }
1438
1439                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1440                         log_error("Failed to start default target: %s", bus_error(&error, r));
1441                         dbus_error_free(&error);
1442                         goto finish;
1443                 }
1444
1445                 after_startup = now(CLOCK_MONOTONIC);
1446                 log_full(arg_action == ACTION_TEST ? LOG_INFO : LOG_DEBUG,
1447                          "Loaded units and determined initial transaction in %s.",
1448                           format_timespan(timespan, sizeof(timespan), after_startup - before_startup));
1449
1450                 if (arg_action == ACTION_TEST) {
1451                         printf("-> By jobs:\n");
1452                         manager_dump_jobs(m, stdout, "\t");
1453                         retval = EXIT_SUCCESS;
1454                         goto finish;
1455                 }
1456         }
1457
1458         for (;;) {
1459                 if ((r = manager_loop(m)) < 0) {
1460                         log_error("Failed to run mainloop: %s", strerror(-r));
1461                         goto finish;
1462                 }
1463
1464                 switch (m->exit_code) {
1465
1466                 case MANAGER_EXIT:
1467                         retval = EXIT_SUCCESS;
1468                         log_debug("Exit.");
1469                         goto finish;
1470
1471                 case MANAGER_RELOAD:
1472                         log_info("Reloading.");
1473                         if ((r = manager_reload(m)) < 0)
1474                                 log_error("Failed to reload: %s", strerror(-r));
1475                         break;
1476
1477                 case MANAGER_REEXECUTE:
1478                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1479                                 goto finish;
1480
1481                         reexecute = true;
1482                         log_notice("Reexecuting.");
1483                         goto finish;
1484
1485                 case MANAGER_REBOOT:
1486                 case MANAGER_POWEROFF:
1487                 case MANAGER_HALT:
1488                 case MANAGER_KEXEC: {
1489                         static const char * const table[_MANAGER_EXIT_CODE_MAX] = {
1490                                 [MANAGER_REBOOT] = "reboot",
1491                                 [MANAGER_POWEROFF] = "poweroff",
1492                                 [MANAGER_HALT] = "halt",
1493                                 [MANAGER_KEXEC] = "kexec"
1494                         };
1495
1496                         assert_se(shutdown_verb = table[m->exit_code]);
1497
1498                         log_notice("Shutting down.");
1499                         goto finish;
1500                 }
1501
1502                 default:
1503                         assert_not_reached("Unknown exit code.");
1504                 }
1505         }
1506
1507 finish:
1508         if (m)
1509                 manager_free(m);
1510
1511         free(arg_default_unit);
1512         strv_free(arg_default_controllers);
1513         free_join_controllers();
1514
1515         dbus_shutdown();
1516
1517         label_finish();
1518
1519         if (reexecute) {
1520                 const char *args[15];
1521                 unsigned i = 0;
1522                 char sfd[16];
1523
1524                 assert(serialization);
1525                 assert(fds);
1526
1527                 args[i++] = SYSTEMD_BINARY_PATH;
1528
1529                 args[i++] = "--log-level";
1530                 args[i++] = log_level_to_string(log_get_max_level());
1531
1532                 args[i++] = "--log-target";
1533                 args[i++] = log_target_to_string(log_get_target());
1534
1535                 if (arg_running_as == MANAGER_SYSTEM)
1536                         args[i++] = "--system";
1537                 else
1538                         args[i++] = "--user";
1539
1540                 if (arg_dump_core)
1541                         args[i++] = "--dump-core";
1542
1543                 if (arg_crash_shell)
1544                         args[i++] = "--crash-shell";
1545
1546                 if (arg_confirm_spawn)
1547                         args[i++] = "--confirm-spawn";
1548
1549                 if (arg_show_status)
1550                         args[i++] = "--show-status=1";
1551                 else
1552                         args[i++] = "--show-status=0";
1553
1554 #ifdef HAVE_SYSV_COMPAT
1555                 if (arg_sysv_console)
1556                         args[i++] = "--sysv-console=1";
1557                 else
1558                         args[i++] = "--sysv-console=0";
1559 #endif
1560
1561                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1562                 char_array_0(sfd);
1563
1564                 args[i++] = "--deserialize";
1565                 args[i++] = sfd;
1566
1567                 args[i++] = NULL;
1568
1569                 assert(i <= ELEMENTSOF(args));
1570
1571                 execv(args[0], (char* const*) args);
1572
1573                 log_error("Failed to reexecute: %m");
1574         }
1575
1576         if (serialization)
1577                 fclose(serialization);
1578
1579         if (fds)
1580                 fdset_free(fds);
1581
1582         if (shutdown_verb) {
1583                 const char * command_line[] = {
1584                         SYSTEMD_SHUTDOWN_BINARY_PATH,
1585                         shutdown_verb,
1586                         NULL
1587                 };
1588
1589                 execv(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line);
1590                 log_error("Failed to execute shutdown binary, freezing: %m");
1591         }
1592
1593         if (getpid() == 1)
1594                 freeze();
1595
1596         return retval;
1597 }