src/main.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   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
  35 #include "manager.h"
  36 #include "log.h"
  37 #include "mount-setup.h"
  38 #include "hostname-setup.h"
  39 #include "loopback-setup.h"
  40 #include "kmod-setup.h"
  41 #include "modprobe-setup.h"
  42 #include "load-fragment.h"
  43 #include "fdset.h"
  44 #include "special.h"
  45
  46 static enum {
  47         ACTION_RUN,
  48         ACTION_HELP,
  49         ACTION_TEST,
  50         ACTION_DUMP_CONFIGURATION_ITEMS,
  51         ACTION_DONE
  52 } arg_action = ACTION_RUN;
  53
  54 static char *arg_default_unit = NULL;
  55 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
  56
  57 static bool arg_dump_core = true;
  58 static bool arg_crash_shell = false;
  59 static int arg_crash_chvt = -1;
  60 static bool arg_confirm_spawn = false;
  61 static bool arg_nomodules = false;
  62 static bool arg_show_status = true;
  63
  64 static FILE* serialization = NULL;
  65
  66 _noreturn_ static void freeze(void) {
  67         for (;;)
  68                 pause();
  69 }
  70
  71 static void nop_handler(int sig) {
  72 }
  73
  74 _noreturn_ static void crash(int sig) {
  75
  76         if (!arg_dump_core)
  77                 log_error("Caught <%s>, not dumping core.", strsignal(sig));
  78         else {
  79                 struct sigaction sa;
  80                 pid_t pid;
  81
  82                 /* We want to wait for the core process, hence let's enable SIGCHLD */
  83                 zero(sa);
  84                 sa.sa_handler = nop_handler;
  85                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
  86                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
  87
  88                 if ((pid = fork()) < 0)
  89                         log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
  90
  91                 else if (pid == 0) {
  92                         struct rlimit rl;
  93
  94                         /* Enable default signal handler for core dump */
  95                         zero(sa);
  96                         sa.sa_handler = SIG_DFL;
  97                         assert_se(sigaction(sig, &sa, NULL) == 0);
  98
  99                         /* Don't limit the core dump size */
 100                         zero(rl);
 101                         rl.rlim_cur = RLIM_INFINITY;
 102                         rl.rlim_max = RLIM_INFINITY;
 103                         setrlimit(RLIMIT_CORE, &rl);
 104
 105                         /* Just to be sure... */
 106                         assert_se(chdir("/") == 0);
 107
 108                         /* Raise the signal again */
 109                         raise(sig);
 110
 111                         assert_not_reached("We shouldn't be here...");
 112                         _exit(1);
 113
 114                 } else {
 115                         int status, r;
 116
 117                         /* Order things nicely. */
 118                         if ((r = waitpid(pid, &status, 0)) < 0)
 119                                 log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
 120                         else if (!WCOREDUMP(status))
 121                                 log_error("Caught <%s>, core dump failed.", strsignal(sig));
 122                         else
 123                                 log_error("Caught <%s>, dumped core as pid %lu.", strsignal(sig), (unsigned long) pid);
 124                 }
 125         }
 126
 127         if (arg_crash_chvt)
 128                 chvt(arg_crash_chvt);
 129
 130         if (arg_crash_shell) {
 131                 struct sigaction sa;
 132                 pid_t pid;
 133
 134                 log_info("Executing crash shell in 10s...");
 135                 sleep(10);
 136
 137                 /* Let the kernel reap children for us */
 138                 zero(sa);
 139                 sa.sa_handler = SIG_IGN;
 140                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
 141                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
 142
 143                 if ((pid = fork()) < 0)
 144                         log_error("Failed to fork off crash shell: %s", strerror(errno));
 145                 else if (pid == 0) {
 146                         int fd, r;
 147
 148                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
 149                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
 150                         else if ((r = make_stdio(fd)) < 0)
 151                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
 152
 153                         execl("/bin/sh", "/bin/sh", NULL);
 154
 155                         log_error("execl() failed: %s", strerror(errno));
 156                         _exit(1);
 157                 }
 158
 159                 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
 160         }
 161
 162         log_info("Freezing execution.");
 163         freeze();
 164 }
 165
 166 static void install_crash_handler(void) {
 167         struct sigaction sa;
 168
 169         zero(sa);
 170
 171         sa.sa_handler = crash;
 172         sa.sa_flags = SA_NODEFER;
 173
 174         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
 175 }
 176
 177 static int make_null_stdio(void) {
 178         int null_fd, r;
 179
 180         if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0) {
 181                 log_error("Failed to open /dev/null: %m");
 182                 return -errno;
 183         }
 184
 185         if ((r = make_stdio(null_fd)) < 0)
 186                 log_warning("Failed to dup2() device: %s", strerror(-r));
 187
 188         return r;
 189 }
 190
 191 static int console_setup(bool do_reset) {
 192         int tty_fd, r;
 193
 194         /* If we are init, we connect stdin/stdout/stderr to /dev/null
 195          * and make sure we don't have a controlling tty. */
 196
 197         release_terminal();
 198
 199         if (!do_reset)
 200                 return 0;
 201
 202         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
 203                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
 204                 return -tty_fd;
 205         }
 206
 207         if ((r = reset_terminal(tty_fd)) < 0)
 208                 log_error("Failed to reset /dev/console: %s", strerror(-r));
 209
 210         close_nointr_nofail(tty_fd);
 211         return r;
 212 }
 213
 214 static int set_default_unit(const char *u) {
 215         char *c;
 216
 217         assert(u);
 218
 219         if (!(c = strdup(u)))
 220                 return -ENOMEM;
 221
 222         free(arg_default_unit);
 223         arg_default_unit = c;
 224         return 0;
 225 }
 226
 227 static int parse_proc_cmdline_word(const char *word) {
 228
 229         static const char * const rlmap[] = {
 230                 "single", SPECIAL_RESCUE_TARGET,
 231                 "-s",     SPECIAL_RESCUE_TARGET,
 232                 "s",      SPECIAL_RESCUE_TARGET,
 233                 "S",      SPECIAL_RESCUE_TARGET,
 234                 "1",      SPECIAL_RESCUE_TARGET,
 235                 "2",      SPECIAL_RUNLEVEL2_TARGET,
 236                 "3",      SPECIAL_RUNLEVEL3_TARGET,
 237                 "4",      SPECIAL_RUNLEVEL4_TARGET,
 238                 "5",      SPECIAL_RUNLEVEL5_TARGET
 239         };
 240         bool ignore_quiet = false;
 241
 242         if (startswith(word, "systemd.unit="))
 243                 return set_default_unit(word + 13);
 244
 245         else if (startswith(word, "systemd.log_target=")) {
 246
 247                 if (log_set_target_from_string(word + 19) < 0)
 248                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
 249
 250         } else if (startswith(word, "systemd.log_level=")) {
 251
 252                 if (log_set_max_level_from_string(word + 18) < 0)
 253                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
 254
 255         } else if (startswith(word, "systemd.log_color=")) {
 256
 257                 if (log_show_color_from_string(word + 18) < 0)
 258                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
 259
 260         } else if (startswith(word, "systemd.log_location=")) {
 261
 262                 if (log_show_location_from_string(word + 21) < 0)
 263                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
 264
 265         } else if (startswith(word, "systemd.dump_core=")) {
 266                 int r;
 267
 268                 if ((r = parse_boolean(word + 18)) < 0)
 269                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
 270                 else
 271                         arg_dump_core = r;
 272
 273         } else if (startswith(word, "systemd.crash_shell=")) {
 274                 int r;
 275
 276                 if ((r = parse_boolean(word + 20)) < 0)
 277                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
 278                 else
 279                         arg_crash_shell = r;
 280
 281         } else if (startswith(word, "systemd.confirm_spawn=")) {
 282                 int r;
 283
 284                 if ((r = parse_boolean(word + 22)) < 0)
 285                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
 286                 else
 287                         arg_confirm_spawn = r;
 288
 289         } else if (startswith(word, "systemd.crash_chvt=")) {
 290                 int k;
 291
 292                 if (safe_atoi(word + 19, &k) < 0)
 293                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
 294                 else
 295                         arg_crash_chvt = k;
 296
 297         } else if (startswith(word, "systemd.show_status=")) {
 298                 int r;
 299
 300                 if ((r = parse_boolean(word + 20)) < 0)
 301                         log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
 302                 else {
 303                         arg_show_status = r;
 304                         ignore_quiet = true;
 305                 }
 306
 307         } else if (startswith(word, "systemd.")) {
 308
 309                 log_warning("Unknown kernel switch %s. Ignoring.", word);
 310
 311                 log_info("Supported kernel switches:\n"
 312                          "systemd.unit=UNIT                        Default unit to start\n"
 313                          "systemd.log_target=console|kmsg|syslog|  Log target\n"
 314                          "                   syslog-org-kmsg|null\n"
 315                          "systemd.log_level=LEVEL                  Log level\n"
 316                          "systemd.log_color=0|1                    Highlight important log messages\n"
 317                          "systemd.log_location=0|1                 Include code location in log messages\n"
 318                          "systemd.dump_core=0|1                    Dump core on crash\n"
 319                          "systemd.crash_shell=0|1                  Run shell on crash\n"
 320                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
 321                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
 322                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n");
 323
 324         } else if (streq(word, "nomodules"))
 325                 arg_nomodules = true;
 326         else if (streq(word, "quiet")) {
 327                 if (!ignore_quiet)
 328                         arg_show_status = false;
 329         } else {
 330                 unsigned i;
 331
 332                 /* SysV compatibility */
 333                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 334                         if (streq(word, rlmap[i]))
 335                                 return set_default_unit(rlmap[i+1]);
 336         }
 337
 338         return 0;
 339 }
 340
 341 static int parse_proc_cmdline(void) {
 342         char *line;
 343         int r;
 344         char *w;
 345         size_t l;
 346         char *state;
 347
 348         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 349                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
 350                 return 0;
 351         }
 352
 353         FOREACH_WORD_QUOTED(w, l, line, state) {
 354                 char *word;
 355
 356                 if (!(word = strndup(w, l))) {
 357                         r = -ENOMEM;
 358                         goto finish;
 359                 }
 360
 361                 r = parse_proc_cmdline_word(word);
 362                 free(word);
 363
 364                 if (r < 0)
 365                         goto finish;
 366         }
 367
 368         r = 0;
 369
 370 finish:
 371         free(line);
 372         return r;
 373 }
 374
 375 static int parse_argv(int argc, char *argv[]) {
 376
 377         enum {
 378                 ARG_LOG_LEVEL = 0x100,
 379                 ARG_LOG_TARGET,
 380                 ARG_LOG_COLOR,
 381                 ARG_LOG_LOCATION,
 382                 ARG_UNIT,
 383                 ARG_RUNNING_AS,
 384                 ARG_TEST,
 385                 ARG_DUMP_CONFIGURATION_ITEMS,
 386                 ARG_DUMP_CORE,
 387                 ARG_CRASH_SHELL,
 388                 ARG_CONFIRM_SPAWN,
 389                 ARG_SHOW_STATUS,
 390                 ARG_DESERIALIZE,
 391                 ARG_INTROSPECT
 392         };
 393
 394         static const struct option options[] = {
 395                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
 396                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
 397                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
 398                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
 399                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
 400                 { "running-as",               required_argument, NULL, ARG_RUNNING_AS               },
 401                 { "test",                     no_argument,       NULL, ARG_TEST                     },
 402                 { "help",                     no_argument,       NULL, 'h'                          },
 403                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
 404                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
 405                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
 406                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
 407                 { "show-status",              no_argument,       NULL, ARG_SHOW_STATUS              },
 408                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
 409                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
 410                 { NULL,                       0,                 NULL, 0                            }
 411         };
 412
 413         int c, r;
 414
 415         assert(argc >= 1);
 416         assert(argv);
 417
 418         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 419
 420                 switch (c) {
 421
 422                 case ARG_LOG_LEVEL:
 423                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
 424                                 log_error("Failed to parse log level %s.", optarg);
 425                                 return r;
 426                         }
 427
 428                         break;
 429
 430                 case ARG_LOG_TARGET:
 431
 432                         if ((r = log_set_target_from_string(optarg)) < 0) {
 433                                 log_error("Failed to parse log target %s.", optarg);
 434                                 return r;
 435                         }
 436
 437                         break;
 438
 439                 case ARG_LOG_COLOR:
 440
 441                         if (optarg) {
 442                                 if ((r = log_show_color_from_string(optarg)) < 0) {
 443                                         log_error("Failed to parse log color setting %s.", optarg);
 444                                         return r;
 445                                 }
 446                         } else
 447                                 log_show_color(true);
 448
 449                         break;
 450
 451                 case ARG_LOG_LOCATION:
 452
 453                         if (optarg) {
 454                                 if ((r = log_show_location_from_string(optarg)) < 0) {
 455                                         log_error("Failed to parse log location setting %s.", optarg);
 456                                         return r;
 457                                 }
 458                         } else
 459                                 log_show_location(true);
 460
 461                         break;
 462
 463                 case ARG_UNIT:
 464
 465                         if ((r = set_default_unit(optarg)) < 0) {
 466                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
 467                                 return r;
 468                         }
 469
 470                         break;
 471
 472                 case ARG_RUNNING_AS: {
 473                         ManagerRunningAs as;
 474
 475                         if ((as = manager_running_as_from_string(optarg)) < 0) {
 476                                 log_error("Failed to parse running as value %s", optarg);
 477                                 return -EINVAL;
 478                         }
 479
 480                         arg_running_as = as;
 481                         break;
 482                 }
 483
 484                 case ARG_TEST:
 485                         arg_action = ACTION_TEST;
 486                         break;
 487
 488                 case ARG_DUMP_CONFIGURATION_ITEMS:
 489                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
 490                         break;
 491
 492                 case ARG_DUMP_CORE:
 493                         arg_dump_core = true;
 494                         break;
 495
 496                 case ARG_CRASH_SHELL:
 497                         arg_crash_shell = true;
 498                         break;
 499
 500                 case ARG_CONFIRM_SPAWN:
 501                         arg_confirm_spawn = true;
 502                         break;
 503
 504                 case ARG_SHOW_STATUS:
 505                         arg_show_status = true;
 506                         break;
 507
 508                 case ARG_DESERIALIZE: {
 509                         int fd;
 510                         FILE *f;
 511
 512                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
 513                                 log_error("Failed to parse deserialize option %s.", optarg);
 514                                 return r;
 515                         }
 516
 517                         if (!(f = fdopen(fd, "r"))) {
 518                                 log_error("Failed to open serialization fd: %m");
 519                                 return r;
 520                         }
 521
 522                         if (serialization)
 523                                 fclose(serialization);
 524
 525                         serialization = f;
 526
 527                         break;
 528                 }
 529
 530                 case ARG_INTROSPECT: {
 531                         const char * const * i = NULL;
 532
 533                         for (i = bus_interface_table; *i; i += 2)
 534                                 if (!optarg || streq(i[0], optarg)) {
 535                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 536                                               "<node>\n", stdout);
 537                                         fputs(i[1], stdout);
 538                                         fputs("</node>\n", stdout);
 539
 540                                         if (optarg)
 541                                                 break;
 542                                 }
 543
 544                         if (!i[0] && optarg)
 545                                 log_error("Unknown interface %s.", optarg);
 546
 547                         arg_action = ACTION_DONE;
 548                         break;
 549                 }
 550
 551                 case 'h':
 552                         arg_action = ACTION_HELP;
 553                         break;
 554
 555                 case '?':
 556                         return -EINVAL;
 557
 558                 default:
 559                         log_error("Unknown option code %c", c);
 560                         return -EINVAL;
 561                 }
 562
 563         /* PID 1 will get the kernel arguments as parameters, which we
 564          * ignore and unconditionally read from
 565          * /proc/cmdline. However, we need to ignore those arguments
 566          * here. */
 567         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
 568                 log_error("Excess arguments.");
 569                 return -EINVAL;
 570         }
 571
 572         return 0;
 573 }
 574
 575 static int help(void) {
 576
 577         printf("%s [OPTIONS...]\n\n"
 578                "Starts up and maintains the system or a session.\n\n"
 579                "  -h --help                      Show this help\n"
 580                "     --test                      Determine startup sequence, dump it and exit\n"
 581                "     --dump-configuration-items  Dump understood unit configuration items\n"
 582                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
 583                "     --unit=UNIT                 Set default unit\n"
 584                "     --running-as=AS             Set running as (system, session)\n"
 585                "     --dump-core                 Dump core on crash\n"
 586                "     --crash-shell               Run shell on crash\n"
 587                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
 588                "     --show-status               Show status updates on the console during bootup\n"
 589                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
 590                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
 591                "     --log-color[=0|1]           Highlight important log messages\n"
 592                "     --log-location[=0|1]        Include code location in log messages\n",
 593                program_invocation_short_name);
 594
 595         return 0;
 596 }
 597
 598 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
 599         FILE *f = NULL;
 600         FDSet *fds = NULL;
 601         int r;
 602
 603         assert(m);
 604         assert(_f);
 605         assert(_fds);
 606
 607         if ((r = manager_open_serialization(&f)) < 0) {
 608                 log_error("Failed to create serialization faile: %s", strerror(-r));
 609                 goto fail;
 610         }
 611
 612         if (!(fds = fdset_new())) {
 613                 r = -ENOMEM;
 614                 log_error("Failed to allocate fd set: %s", strerror(-r));
 615                 goto fail;
 616         }
 617
 618         if ((r = manager_serialize(m, f, fds)) < 0) {
 619                 log_error("Failed to serialize state: %s", strerror(-r));
 620                 goto fail;
 621         }
 622
 623         if (fseeko(f, 0, SEEK_SET) < 0) {
 624                 log_error("Failed to rewind serialization fd: %m");
 625                 goto fail;
 626         }
 627
 628         if ((r = fd_cloexec(fileno(f), false)) < 0) {
 629                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
 630                 goto fail;
 631         }
 632
 633         if ((r = fdset_cloexec(fds, false)) < 0) {
 634                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
 635                 goto fail;
 636         }
 637
 638         *_f = f;
 639         *_fds = fds;
 640
 641         return 0;
 642
 643 fail:
 644         fdset_free(fds);
 645
 646         if (f)
 647                 fclose(f);
 648
 649         return r;
 650 }
 651
 652 int main(int argc, char *argv[]) {
 653         Manager *m = NULL;
 654         Unit *target = NULL;
 655         Job *job = NULL;
 656         int r, retval = 1;
 657         FDSet *fds = NULL;
 658         bool reexecute = false;
 659
 660         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
 661                 /* This is compatbility support for SysV, where
 662                  * calling init as a user is identical to telinit. */
 663
 664                 errno = -ENOENT;
 665                 execv(SYSTEMCTL_BINARY_PATH, argv);
 666                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
 667                 return 1;
 668         }
 669
 670         log_show_color(true);
 671         log_show_location(false);
 672         log_set_max_level(LOG_DEBUG);
 673
 674         if (getpid() == 1) {
 675                 arg_running_as = MANAGER_SYSTEM;
 676                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 677         } else {
 678                 arg_running_as = MANAGER_SESSION;
 679                 log_set_target(LOG_TARGET_CONSOLE);
 680         }
 681
 682         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
 683                 goto finish;
 684
 685         /* Mount /proc, /sys and friends, so that /proc/cmdline and
 686          * /proc/$PID/fd is available. */
 687         if (geteuid() == 0)
 688                 if (mount_setup() < 0)
 689                         goto finish;
 690
 691         /* Reset all signal handlers. */
 692         assert_se(reset_all_signal_handlers() == 0);
 693
 694         /* If we are init, we can block sigkill. Yay. */
 695         ignore_signals(SIGNALS_IGNORE, -1);
 696
 697         if (arg_running_as == MANAGER_SYSTEM)
 698                 if (parse_proc_cmdline() < 0)
 699                         goto finish;
 700
 701         log_parse_environment();
 702
 703         if (parse_argv(argc, argv) < 0)
 704                 goto finish;
 705
 706         if (arg_action == ACTION_HELP) {
 707                 retval = help();
 708                 goto finish;
 709         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
 710                 unit_dump_config_items(stdout);
 711                 retval = 0;
 712                 goto finish;
 713         } else if (arg_action == ACTION_DONE) {
 714                 retval = 0;
 715                 goto finish;
 716         }
 717
 718         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
 719
 720         /* Remember open file descriptors for later deserialization */
 721         if (serialization) {
 722                 if ((r = fdset_new_fill(&fds)) < 0) {
 723                         log_error("Failed to allocate fd set: %s", strerror(-r));
 724                         goto finish;
 725                 }
 726
 727                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
 728         } else
 729                 close_all_fds(NULL, 0);
 730
 731         /* Set up PATH unless it is already set */
 732         setenv("PATH",
 733                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
 734                arg_running_as == MANAGER_SYSTEM);
 735
 736         /* Move out of the way, so that we won't block unmounts */
 737         assert_se(chdir("/")  == 0);
 738
 739         if (arg_running_as == MANAGER_SYSTEM) {
 740                 /* Become a session leader if we aren't one yet. */
 741                 setsid();
 742
 743                 /* Disable the umask logic */
 744                 umask(0);
 745         }
 746
 747         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
 748         dbus_connection_set_change_sigpipe(FALSE);
 749
 750         /* Reset the console, but only if this is really init and we
 751          * are freshly booted */
 752         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
 753                 console_setup(getpid() == 1 && !serialization);
 754                 make_null_stdio();
 755         }
 756
 757         /* Open the logging devices, if possible and necessary */
 758         log_open();
 759
 760         /* Make sure we leave a core dump without panicing the
 761          * kernel. */
 762         if (getpid() == 1)
 763                 install_crash_handler();
 764
 765         log_debug(PACKAGE_STRING " running in %s mode.", manager_running_as_to_string(arg_running_as));
 766
 767         if (arg_running_as == MANAGER_SYSTEM) {
 768                 modprobe_setup(arg_nomodules);
 769                 kmod_setup();
 770                 hostname_setup();
 771                 loopback_setup();
 772         }
 773
 774         if ((r = manager_new(arg_running_as, &m)) < 0) {
 775                 log_error("Failed to allocate manager object: %s", strerror(-r));
 776                 goto finish;
 777         }
 778
 779         m->confirm_spawn = arg_confirm_spawn;
 780         m->show_status = arg_show_status;
 781
 782         if ((r = manager_startup(m, serialization, fds)) < 0)
 783                 log_error("Failed to fully start up daemon: %s", strerror(-r));
 784
 785         if (fds) {
 786                 /* This will close all file descriptors that were opened, but
 787                  * not claimed by any unit. */
 788
 789                 fdset_free(fds);
 790                 fds = NULL;
 791         }
 792
 793         if (serialization) {
 794                 fclose(serialization);
 795                 serialization = NULL;
 796         } else {
 797                 log_debug("Activating default unit: %s", arg_default_unit);
 798
 799                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &target)) < 0) {
 800                         log_error("Failed to load default target: %s", strerror(-r));
 801
 802                         log_info("Trying to load rescue target...");
 803                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &target)) < 0) {
 804                                 log_error("Failed to load rescue target: %s", strerror(-r));
 805                                 goto finish;
 806                         }
 807                 }
 808
 809                 if (arg_action == ACTION_TEST) {
 810                         printf("-> By units:\n");
 811                         manager_dump_units(m, stdout, "\t");
 812                 }
 813
 814                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
 815                         log_error("Failed to start default target: %s", strerror(-r));
 816                         goto finish;
 817                 }
 818
 819                 if (arg_action == ACTION_TEST) {
 820                         printf("-> By jobs:\n");
 821                         manager_dump_jobs(m, stdout, "\t");
 822                         retval = 0;
 823                         goto finish;
 824                 }
 825         }
 826
 827         for (;;) {
 828                 if ((r = manager_loop(m)) < 0) {
 829                         log_error("Failed to run mainloop: %s", strerror(-r));
 830                         goto finish;
 831                 }
 832
 833                 switch (m->exit_code) {
 834
 835                 case MANAGER_EXIT:
 836                         retval = 0;
 837                         log_debug("Exit.");
 838                         goto finish;
 839
 840                 case MANAGER_RELOAD:
 841                         if ((r = manager_reload(m)) < 0)
 842                                 log_error("Failed to reload: %s", strerror(-r));
 843                         break;
 844
 845                 case MANAGER_REEXECUTE:
 846                         if (prepare_reexecute(m, &serialization, &fds) < 0)
 847                                 goto finish;
 848
 849                         reexecute = true;
 850                         log_debug("Reexecuting.");
 851                         goto finish;
 852
 853                 default:
 854                         assert_not_reached("Unknown exit code.");
 855                 }
 856         }
 857
 858 finish:
 859         if (m)
 860                 manager_free(m);
 861
 862         free(arg_default_unit);
 863
 864         dbus_shutdown();
 865
 866         if (reexecute) {
 867                 const char *args[11];
 868                 unsigned i = 0;
 869                 char sfd[16];
 870
 871                 assert(serialization);
 872                 assert(fds);
 873
 874                 args[i++] = SYSTEMD_BINARY_PATH;
 875
 876                 args[i++] = "--log-level";
 877                 args[i++] = log_level_to_string(log_get_max_level());
 878
 879                 args[i++] = "--log-target";
 880                 args[i++] = log_target_to_string(log_get_target());
 881
 882                 args[i++] = "--running-as";
 883                 args[i++] = manager_running_as_to_string(arg_running_as);
 884
 885                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
 886                 char_array_0(sfd);
 887
 888                 args[i++] = "--deserialize";
 889                 args[i++] = sfd;
 890
 891                 if (arg_confirm_spawn)
 892                         args[i++] = "--confirm-spawn";
 893
 894                 args[i++] = NULL;
 895
 896                 assert(i <= ELEMENTSOF(args));
 897
 898                 execv(args[0], (char* const*) args);
 899
 900                 log_error("Failed to reexecute: %m");
 901         }
 902
 903         if (serialization)
 904                 fclose(serialization);
 905
 906         if (fds)
 907                 fdset_free(fds);
 908
 909         if (getpid() == 1)
 910                 freeze();
 911
 912         return retval;
 913 }