chiark / gitweb /
main: print warning if /usr is on a seperate partition
[elogind.git] / 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 "load-fragment.h"
45 #include "fdset.h"
46 #include "special.h"
47 #include "conf-parser.h"
48 #include "bus-errors.h"
49 #include "missing.h"
50 #include "label.h"
51 #include "build.h"
52 #include "strv.h"
53
54 static enum {
55         ACTION_RUN,
56         ACTION_HELP,
57         ACTION_TEST,
58         ACTION_DUMP_CONFIGURATION_ITEMS,
59         ACTION_DONE
60 } arg_action = ACTION_RUN;
61
62 static char *arg_default_unit = NULL;
63 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
64
65 static bool arg_dump_core = true;
66 static bool arg_crash_shell = false;
67 static int arg_crash_chvt = -1;
68 static bool arg_confirm_spawn = false;
69 static bool arg_show_status = true;
70 #ifdef HAVE_SYSV_COMPAT
71 static bool arg_sysv_console = true;
72 #endif
73 static bool arg_mount_auto = true;
74 static bool arg_swap_auto = true;
75 static char **arg_default_controllers = NULL;
76 static ExecOutput arg_default_std_output = EXEC_OUTPUT_INHERIT;
77 static ExecOutput arg_default_std_error = EXEC_OUTPUT_INHERIT;
78
79 static FILE* serialization = NULL;
80
81 static void nop_handler(int sig) {
82 }
83
84 _noreturn_ static void crash(int sig) {
85
86         if (!arg_dump_core)
87                 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
88         else {
89                 struct sigaction sa;
90                 pid_t pid;
91
92                 /* We want to wait for the core process, hence let's enable SIGCHLD */
93                 zero(sa);
94                 sa.sa_handler = nop_handler;
95                 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
96                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
97
98                 if ((pid = fork()) < 0)
99                         log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
100
101                 else if (pid == 0) {
102                         struct rlimit rl;
103
104                         /* Enable default signal handler for core dump */
105                         zero(sa);
106                         sa.sa_handler = SIG_DFL;
107                         assert_se(sigaction(sig, &sa, NULL) == 0);
108
109                         /* Don't limit the core dump size */
110                         zero(rl);
111                         rl.rlim_cur = RLIM_INFINITY;
112                         rl.rlim_max = RLIM_INFINITY;
113                         setrlimit(RLIMIT_CORE, &rl);
114
115                         /* Just to be sure... */
116                         assert_se(chdir("/") == 0);
117
118                         /* Raise the signal again */
119                         raise(sig);
120
121                         assert_not_reached("We shouldn't be here...");
122                         _exit(1);
123
124                 } else {
125                         siginfo_t status;
126                         int r;
127
128                         /* Order things nicely. */
129                         if ((r = wait_for_terminate(pid, &status)) < 0)
130                                 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(-r));
131                         else if (status.si_code != CLD_DUMPED)
132                                 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
133                         else
134                                 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
135                 }
136         }
137
138         if (arg_crash_chvt)
139                 chvt(arg_crash_chvt);
140
141         if (arg_crash_shell) {
142                 struct sigaction sa;
143                 pid_t pid;
144
145                 log_info("Executing crash shell in 10s...");
146                 sleep(10);
147
148                 /* Let the kernel reap children for us */
149                 zero(sa);
150                 sa.sa_handler = SIG_IGN;
151                 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
152                 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
153
154                 if ((pid = fork()) < 0)
155                         log_error("Failed to fork off crash shell: %s", strerror(errno));
156                 else if (pid == 0) {
157                         int fd, r;
158
159                         if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
160                                 log_error("Failed to acquire terminal: %s", strerror(-fd));
161                         else if ((r = make_stdio(fd)) < 0)
162                                 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
163
164                         execl("/bin/sh", "/bin/sh", NULL);
165
166                         log_error("execl() failed: %s", strerror(errno));
167                         _exit(1);
168                 }
169
170                 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
171         }
172
173         log_info("Freezing execution.");
174         freeze();
175 }
176
177 static void install_crash_handler(void) {
178         struct sigaction sa;
179
180         zero(sa);
181
182         sa.sa_handler = crash;
183         sa.sa_flags = SA_NODEFER;
184
185         sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
186 }
187
188 static int console_setup(bool do_reset) {
189         int tty_fd, r;
190
191         /* If we are init, we connect stdin/stdout/stderr to /dev/null
192          * and make sure we don't have a controlling tty. */
193
194         release_terminal();
195
196         if (!do_reset)
197                 return 0;
198
199         if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
200                 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
201                 return -tty_fd;
202         }
203
204         if ((r = reset_terminal(tty_fd)) < 0)
205                 log_error("Failed to reset /dev/console: %s", strerror(-r));
206
207         close_nointr_nofail(tty_fd);
208         return r;
209 }
210
211 static int set_default_unit(const char *u) {
212         char *c;
213
214         assert(u);
215
216         if (!(c = strdup(u)))
217                 return -ENOMEM;
218
219         free(arg_default_unit);
220         arg_default_unit = c;
221         return 0;
222 }
223
224 static int parse_proc_cmdline_word(const char *word) {
225
226         static const char * const rlmap[] = {
227                 "emergency", SPECIAL_EMERGENCY_TARGET,
228                 "single",    SPECIAL_RESCUE_TARGET,
229                 "-s",        SPECIAL_RESCUE_TARGET,
230                 "s",         SPECIAL_RESCUE_TARGET,
231                 "S",         SPECIAL_RESCUE_TARGET,
232                 "1",         SPECIAL_RESCUE_TARGET,
233                 "2",         SPECIAL_RUNLEVEL2_TARGET,
234                 "3",         SPECIAL_RUNLEVEL3_TARGET,
235                 "4",         SPECIAL_RUNLEVEL4_TARGET,
236                 "5",         SPECIAL_RUNLEVEL5_TARGET,
237         };
238
239         assert(word);
240
241         if (startswith(word, "systemd.unit="))
242                 return set_default_unit(word + 13);
243
244         else if (startswith(word, "systemd.log_target=")) {
245
246                 if (log_set_target_from_string(word + 19) < 0)
247                         log_warning("Failed to parse log target %s. Ignoring.", word + 19);
248
249         } else if (startswith(word, "systemd.log_level=")) {
250
251                 if (log_set_max_level_from_string(word + 18) < 0)
252                         log_warning("Failed to parse log level %s. Ignoring.", word + 18);
253
254         } else if (startswith(word, "systemd.log_color=")) {
255
256                 if (log_show_color_from_string(word + 18) < 0)
257                         log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
258
259         } else if (startswith(word, "systemd.log_location=")) {
260
261                 if (log_show_location_from_string(word + 21) < 0)
262                         log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
263
264         } else if (startswith(word, "systemd.dump_core=")) {
265                 int r;
266
267                 if ((r = parse_boolean(word + 18)) < 0)
268                         log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
269                 else
270                         arg_dump_core = r;
271
272         } else if (startswith(word, "systemd.crash_shell=")) {
273                 int r;
274
275                 if ((r = parse_boolean(word + 20)) < 0)
276                         log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
277                 else
278                         arg_crash_shell = r;
279
280         } else if (startswith(word, "systemd.confirm_spawn=")) {
281                 int r;
282
283                 if ((r = parse_boolean(word + 22)) < 0)
284                         log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
285                 else
286                         arg_confirm_spawn = r;
287
288         } else if (startswith(word, "systemd.crash_chvt=")) {
289                 int k;
290
291                 if (safe_atoi(word + 19, &k) < 0)
292                         log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
293                 else
294                         arg_crash_chvt = k;
295
296         } else if (startswith(word, "systemd.show_status=")) {
297                 int r;
298
299                 if ((r = parse_boolean(word + 20)) < 0)
300                         log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
301                 else
302                         arg_show_status = r;
303         } else if (startswith(word, "systemd.default_standard_output=")) {
304                 int r;
305
306                 if ((r = exec_output_from_string(word + 32)) < 0)
307                         log_warning("Failed to parse default standard output switch %s, Ignoring.", word + 32);
308                 else
309                         arg_default_std_output = r;
310         } else if (startswith(word, "systemd.default_standard_error=")) {
311                 int r;
312
313                 if ((r = exec_output_from_string(word + 31)) < 0)
314                         log_warning("Failed to parse default standard error switch %s, Ignoring.", word + 31);
315                 else
316                         arg_default_std_error = r;
317 #ifdef HAVE_SYSV_COMPAT
318         } else if (startswith(word, "systemd.sysv_console=")) {
319                 int r;
320
321                 if ((r = parse_boolean(word + 21)) < 0)
322                         log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20);
323                 else
324                         arg_sysv_console = r;
325 #endif
326
327         } else if (startswith(word, "systemd.")) {
328
329                 log_warning("Unknown kernel switch %s. Ignoring.", word);
330
331                 log_info("Supported kernel switches:\n"
332                          "systemd.unit=UNIT                        Default unit to start\n"
333                          "systemd.dump_core=0|1                    Dump core on crash\n"
334                          "systemd.crash_shell=0|1                  Run shell on crash\n"
335                          "systemd.crash_chvt=N                     Change to VT #N on crash\n"
336                          "systemd.confirm_spawn=0|1                Confirm every process spawn\n"
337                          "systemd.show_status=0|1                  Show status updates on the console during bootup\n"
338 #ifdef HAVE_SYSV_COMPAT
339                          "systemd.sysv_console=0|1                 Connect output of SysV scripts to console\n"
340 #endif
341                          "systemd.log_target=console|kmsg|syslog|syslog-or-kmsg|null\n"
342                          "                                         Log target\n"
343                          "systemd.log_level=LEVEL                  Log level\n"
344                          "systemd.log_color=0|1                    Highlight important log messages\n"
345                          "systemd.log_location=0|1                 Include code location in log messages\n"
346                          "systemd.default_standard_output=null|tty|syslog|syslog+console|kmsg|kmsg+console\n"
347                          "                                         Set default log output for services\n"
348                          "systemd.default_standard_error=null|tty|syslog|syslog+console|kmsg|kmsg+console\n"
349                          "                                         Set default log error output for services\n");
350
351         } else if (streq(word, "quiet")) {
352                 arg_show_status = false;
353 #ifdef HAVE_SYSV_COMPAT
354                 arg_sysv_console = false;
355 #endif
356         } else {
357                 unsigned i;
358
359                 /* SysV compatibility */
360                 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
361                         if (streq(word, rlmap[i]))
362                                 return set_default_unit(rlmap[i+1]);
363         }
364
365         return 0;
366 }
367
368 static int config_parse_level(
369                 const char *filename,
370                 unsigned line,
371                 const char *section,
372                 const char *lvalue,
373                 const char *rvalue,
374                 void *data,
375                 void *userdata) {
376
377         assert(filename);
378         assert(lvalue);
379         assert(rvalue);
380
381         log_set_max_level_from_string(rvalue);
382         return 0;
383 }
384
385 static int config_parse_target(
386                 const char *filename,
387                 unsigned line,
388                 const char *section,
389                 const char *lvalue,
390                 const char *rvalue,
391                 void *data,
392                 void *userdata) {
393
394         assert(filename);
395         assert(lvalue);
396         assert(rvalue);
397
398         log_set_target_from_string(rvalue);
399         return 0;
400 }
401
402 static int config_parse_color(
403                 const char *filename,
404                 unsigned line,
405                 const char *section,
406                 const char *lvalue,
407                 const char *rvalue,
408                 void *data,
409                 void *userdata) {
410
411         assert(filename);
412         assert(lvalue);
413         assert(rvalue);
414
415         log_show_color_from_string(rvalue);
416         return 0;
417 }
418
419 static int config_parse_location(
420                 const char *filename,
421                 unsigned line,
422                 const char *section,
423                 const char *lvalue,
424                 const char *rvalue,
425                 void *data,
426                 void *userdata) {
427
428         assert(filename);
429         assert(lvalue);
430         assert(rvalue);
431
432         log_show_location_from_string(rvalue);
433         return 0;
434 }
435
436 static int config_parse_cpu_affinity(
437                 const char *filename,
438                 unsigned line,
439                 const char *section,
440                 const char *lvalue,
441                 const char *rvalue,
442                 void *data,
443                 void *userdata) {
444
445         char *w;
446         size_t l;
447         char *state;
448         cpu_set_t *c = NULL;
449         unsigned ncpus = 0;
450
451         assert(filename);
452         assert(lvalue);
453         assert(rvalue);
454
455         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
456                 char *t;
457                 int r;
458                 unsigned cpu;
459
460                 if (!(t = strndup(w, l)))
461                         return -ENOMEM;
462
463                 r = safe_atou(t, &cpu);
464                 free(t);
465
466                 if (!c)
467                         if (!(c = cpu_set_malloc(&ncpus)))
468                                 return -ENOMEM;
469
470                 if (r < 0 || cpu >= ncpus) {
471                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
472                         CPU_FREE(c);
473                         return -EBADMSG;
474                 }
475
476                 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
477         }
478
479         if (c) {
480                 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
481                         log_warning("Failed to set CPU affinity: %m");
482
483                 CPU_FREE(c);
484         }
485
486         return 0;
487 }
488
489 static DEFINE_CONFIG_PARSE_ENUM(config_parse_output, exec_output, ExecOutput, "Failed to parse output specifier");
490
491 static int parse_config_file(void) {
492
493         const ConfigItem items[] = {
494                 { "LogLevel",              config_parse_level,        NULL,                     "Manager" },
495                 { "LogTarget",             config_parse_target,       NULL,                     "Manager" },
496                 { "LogColor",              config_parse_color,        NULL,                     "Manager" },
497                 { "LogLocation",           config_parse_location,     NULL,                     "Manager" },
498                 { "DumpCore",              config_parse_bool,         &arg_dump_core,           "Manager" },
499                 { "CrashShell",            config_parse_bool,         &arg_crash_shell,         "Manager" },
500                 { "ShowStatus",            config_parse_bool,         &arg_show_status,         "Manager" },
501 #ifdef HAVE_SYSV_COMPAT
502                 { "SysVConsole",           config_parse_bool,         &arg_sysv_console,        "Manager" },
503 #endif
504                 { "CrashChVT",             config_parse_int,          &arg_crash_chvt,          "Manager" },
505                 { "CPUAffinity",           config_parse_cpu_affinity, NULL,                     "Manager" },
506                 { "MountAuto",             config_parse_bool,         &arg_mount_auto,          "Manager" },
507                 { "SwapAuto",              config_parse_bool,         &arg_swap_auto,           "Manager" },
508                 { "DefaultControllers",    config_parse_strv,         &arg_default_controllers, "Manager" },
509                 { "DefaultStandardOutput", config_parse_output,       &arg_default_std_output,  "Manager" },
510                 { "DefaultStandardError",  config_parse_output,       &arg_default_std_error,   "Manager" },
511                 { NULL, NULL, NULL, NULL }
512         };
513
514         static const char * const sections[] = {
515                 "Manager",
516                 NULL
517         };
518
519         FILE *f;
520         const char *fn;
521         int r;
522
523         fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : USER_CONFIG_FILE;
524
525         if (!(f = fopen(fn, "re"))) {
526                 if (errno == ENOENT)
527                         return 0;
528
529                 log_warning("Failed to open configuration file '%s': %m", fn);
530                 return 0;
531         }
532
533         if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
534                 log_warning("Failed to parse configuration file: %s", strerror(-r));
535
536         fclose(f);
537
538         return 0;
539 }
540
541 static int parse_proc_cmdline(void) {
542         char *line, *w, *state;
543         int r;
544         size_t l;
545
546         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
547                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
548                 return 0;
549         }
550
551         FOREACH_WORD_QUOTED(w, l, line, state) {
552                 char *word;
553
554                 if (!(word = strndup(w, l))) {
555                         r = -ENOMEM;
556                         goto finish;
557                 }
558
559                 r = parse_proc_cmdline_word(word);
560                 free(word);
561
562                 if (r < 0)
563                         goto finish;
564         }
565
566         r = 0;
567
568 finish:
569         free(line);
570         return r;
571 }
572
573 static int parse_argv(int argc, char *argv[]) {
574
575         enum {
576                 ARG_LOG_LEVEL = 0x100,
577                 ARG_LOG_TARGET,
578                 ARG_LOG_COLOR,
579                 ARG_LOG_LOCATION,
580                 ARG_UNIT,
581                 ARG_SYSTEM,
582                 ARG_USER,
583                 ARG_TEST,
584                 ARG_DUMP_CONFIGURATION_ITEMS,
585                 ARG_DUMP_CORE,
586                 ARG_CRASH_SHELL,
587                 ARG_CONFIRM_SPAWN,
588                 ARG_SHOW_STATUS,
589                 ARG_SYSV_CONSOLE,
590                 ARG_DESERIALIZE,
591                 ARG_INTROSPECT,
592                 ARG_DEFAULT_STD_OUTPUT,
593                 ARG_DEFAULT_STD_ERROR
594         };
595
596         static const struct option options[] = {
597                 { "log-level",                required_argument, NULL, ARG_LOG_LEVEL                },
598                 { "log-target",               required_argument, NULL, ARG_LOG_TARGET               },
599                 { "log-color",                optional_argument, NULL, ARG_LOG_COLOR                },
600                 { "log-location",             optional_argument, NULL, ARG_LOG_LOCATION             },
601                 { "unit",                     required_argument, NULL, ARG_UNIT                     },
602                 { "system",                   no_argument,       NULL, ARG_SYSTEM                   },
603                 { "user",                     no_argument,       NULL, ARG_USER                     },
604                 { "test",                     no_argument,       NULL, ARG_TEST                     },
605                 { "help",                     no_argument,       NULL, 'h'                          },
606                 { "dump-configuration-items", no_argument,       NULL, ARG_DUMP_CONFIGURATION_ITEMS },
607                 { "dump-core",                no_argument,       NULL, ARG_DUMP_CORE                },
608                 { "crash-shell",              no_argument,       NULL, ARG_CRASH_SHELL              },
609                 { "confirm-spawn",            no_argument,       NULL, ARG_CONFIRM_SPAWN            },
610                 { "show-status",              optional_argument, NULL, ARG_SHOW_STATUS              },
611 #ifdef HAVE_SYSV_COMPAT
612                 { "sysv-console",             optional_argument, NULL, ARG_SYSV_CONSOLE             },
613 #endif
614                 { "deserialize",              required_argument, NULL, ARG_DESERIALIZE              },
615                 { "introspect",               optional_argument, NULL, ARG_INTROSPECT               },
616                 { "default-standard-output",  required_argument, NULL, ARG_DEFAULT_STD_OUTPUT,      },
617                 { "default-standard-error",   required_argument, NULL, ARG_DEFAULT_STD_ERROR,       },
618                 { NULL,                       0,                 NULL, 0                            }
619         };
620
621         int c, r;
622
623         assert(argc >= 1);
624         assert(argv);
625
626         while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
627
628                 switch (c) {
629
630                 case ARG_LOG_LEVEL:
631                         if ((r = log_set_max_level_from_string(optarg)) < 0) {
632                                 log_error("Failed to parse log level %s.", optarg);
633                                 return r;
634                         }
635
636                         break;
637
638                 case ARG_LOG_TARGET:
639
640                         if ((r = log_set_target_from_string(optarg)) < 0) {
641                                 log_error("Failed to parse log target %s.", optarg);
642                                 return r;
643                         }
644
645                         break;
646
647                 case ARG_LOG_COLOR:
648
649                         if (optarg) {
650                                 if ((r = log_show_color_from_string(optarg)) < 0) {
651                                         log_error("Failed to parse log color setting %s.", optarg);
652                                         return r;
653                                 }
654                         } else
655                                 log_show_color(true);
656
657                         break;
658
659                 case ARG_LOG_LOCATION:
660
661                         if (optarg) {
662                                 if ((r = log_show_location_from_string(optarg)) < 0) {
663                                         log_error("Failed to parse log location setting %s.", optarg);
664                                         return r;
665                                 }
666                         } else
667                                 log_show_location(true);
668
669                         break;
670
671                 case ARG_DEFAULT_STD_OUTPUT:
672
673                         if ((r = exec_output_from_string(optarg)) < 0) {
674                                 log_error("Failed to parse default standard output setting %s.", optarg);
675                                 return r;
676                         } else
677                                 arg_default_std_output = r;
678                         break;
679
680                 case ARG_DEFAULT_STD_ERROR:
681
682                         if ((r = exec_output_from_string(optarg)) < 0) {
683                                 log_error("Failed to parse default standard error output setting %s.", optarg);
684                                 return r;
685                         } else
686                                 arg_default_std_error = r;
687                         break;
688
689                 case ARG_UNIT:
690
691                         if ((r = set_default_unit(optarg)) < 0) {
692                                 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
693                                 return r;
694                         }
695
696                         break;
697
698                 case ARG_SYSTEM:
699                         arg_running_as = MANAGER_SYSTEM;
700                         break;
701
702                 case ARG_USER:
703                         arg_running_as = MANAGER_USER;
704                         break;
705
706                 case ARG_TEST:
707                         arg_action = ACTION_TEST;
708                         break;
709
710                 case ARG_DUMP_CONFIGURATION_ITEMS:
711                         arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
712                         break;
713
714                 case ARG_DUMP_CORE:
715                         arg_dump_core = true;
716                         break;
717
718                 case ARG_CRASH_SHELL:
719                         arg_crash_shell = true;
720                         break;
721
722                 case ARG_CONFIRM_SPAWN:
723                         arg_confirm_spawn = true;
724                         break;
725
726                 case ARG_SHOW_STATUS:
727
728                         if (optarg) {
729                                 if ((r = parse_boolean(optarg)) < 0) {
730                                         log_error("Failed to show status boolean %s.", optarg);
731                                         return r;
732                                 }
733                                 arg_show_status = r;
734                         } else
735                                 arg_show_status = true;
736                         break;
737 #ifdef HAVE_SYSV_COMPAT
738                 case ARG_SYSV_CONSOLE:
739
740                         if (optarg) {
741                                 if ((r = parse_boolean(optarg)) < 0) {
742                                         log_error("Failed to SysV console boolean %s.", optarg);
743                                         return r;
744                                 }
745                                 arg_sysv_console = r;
746                         } else
747                                 arg_sysv_console = true;
748                         break;
749 #endif
750
751                 case ARG_DESERIALIZE: {
752                         int fd;
753                         FILE *f;
754
755                         if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
756                                 log_error("Failed to parse deserialize option %s.", optarg);
757                                 return r;
758                         }
759
760                         if (!(f = fdopen(fd, "r"))) {
761                                 log_error("Failed to open serialization fd: %m");
762                                 return r;
763                         }
764
765                         if (serialization)
766                                 fclose(serialization);
767
768                         serialization = f;
769
770                         break;
771                 }
772
773                 case ARG_INTROSPECT: {
774                         const char * const * i = NULL;
775
776                         for (i = bus_interface_table; *i; i += 2)
777                                 if (!optarg || streq(i[0], optarg)) {
778                                         fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
779                                               "<node>\n", stdout);
780                                         fputs(i[1], stdout);
781                                         fputs("</node>\n", stdout);
782
783                                         if (optarg)
784                                                 break;
785                                 }
786
787                         if (!i[0] && optarg)
788                                 log_error("Unknown interface %s.", optarg);
789
790                         arg_action = ACTION_DONE;
791                         break;
792                 }
793
794                 case 'h':
795                         arg_action = ACTION_HELP;
796                         break;
797
798                 case 'D':
799                         log_set_max_level(LOG_DEBUG);
800                         break;
801
802                 case '?':
803                         return -EINVAL;
804
805                 default:
806                         log_error("Unknown option code %c", c);
807                         return -EINVAL;
808                 }
809
810         /* PID 1 will get the kernel arguments as parameters, which we
811          * ignore and unconditionally read from
812          * /proc/cmdline. However, we need to ignore those arguments
813          * here. */
814         if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
815                 log_error("Excess arguments.");
816                 return -EINVAL;
817         }
818
819         return 0;
820 }
821
822 static int help(void) {
823
824         printf("%s [OPTIONS...]\n\n"
825                "Starts up and maintains the system or user services.\n\n"
826                "  -h --help                      Show this help\n"
827                "     --test                      Determine startup sequence, dump it and exit\n"
828                "     --dump-configuration-items  Dump understood unit configuration items\n"
829                "     --introspect[=INTERFACE]    Extract D-Bus interface data\n"
830                "     --unit=UNIT                 Set default unit\n"
831                "     --system                    Run a system instance, even if PID != 1\n"
832                "     --user                      Run a user instance\n"
833                "     --dump-core                 Dump core on crash\n"
834                "     --crash-shell               Run shell on crash\n"
835                "     --confirm-spawn             Ask for confirmation when spawning processes\n"
836                "     --show-status[=0|1]         Show status updates on the console during bootup\n"
837 #ifdef HAVE_SYSV_COMPAT
838                "     --sysv-console[=0|1]        Connect output of SysV scripts to console\n"
839 #endif
840                "     --log-target=TARGET         Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
841                "     --log-level=LEVEL           Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
842                "     --log-color[=0|1]           Highlight important log messages\n"
843                "     --log-location[=0|1]        Include code location in log messages\n"
844                "     --default-standard-output=  Set default standard output for services\n"
845                "     --default-standard-error=   Set default standard error output for services\n",
846                program_invocation_short_name);
847
848         return 0;
849 }
850
851 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
852         FILE *f = NULL;
853         FDSet *fds = NULL;
854         int r;
855
856         assert(m);
857         assert(_f);
858         assert(_fds);
859
860         if ((r = manager_open_serialization(m, &f)) < 0) {
861                 log_error("Failed to create serialization faile: %s", strerror(-r));
862                 goto fail;
863         }
864
865         if (!(fds = fdset_new())) {
866                 r = -ENOMEM;
867                 log_error("Failed to allocate fd set: %s", strerror(-r));
868                 goto fail;
869         }
870
871         if ((r = manager_serialize(m, f, fds)) < 0) {
872                 log_error("Failed to serialize state: %s", strerror(-r));
873                 goto fail;
874         }
875
876         if (fseeko(f, 0, SEEK_SET) < 0) {
877                 log_error("Failed to rewind serialization fd: %m");
878                 goto fail;
879         }
880
881         if ((r = fd_cloexec(fileno(f), false)) < 0) {
882                 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
883                 goto fail;
884         }
885
886         if ((r = fdset_cloexec(fds, false)) < 0) {
887                 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
888                 goto fail;
889         }
890
891         *_f = f;
892         *_fds = fds;
893
894         return 0;
895
896 fail:
897         fdset_free(fds);
898
899         if (f)
900                 fclose(f);
901
902         return r;
903 }
904
905 static struct dual_timestamp* parse_initrd_timestamp(struct dual_timestamp *t) {
906         const char *e;
907         unsigned long long a, b;
908
909         assert(t);
910
911         if (!(e = getenv("RD_TIMESTAMP")))
912                 return NULL;
913
914         if (sscanf(e, "%llu %llu", &a, &b) != 2)
915                 return NULL;
916
917         t->realtime = (usec_t) a;
918         t->monotonic = (usec_t) b;
919
920         return t;
921 }
922
923 static void test_mtab(void) {
924         char *p;
925
926         /* Check that /etc/mtab is a symlink */
927
928         if (readlink_malloc("/etc/mtab", &p) >= 0) {
929                 bool b;
930
931                 b = streq(p, "/proc/self/mounts") || streq(p, "/proc/mounts");
932                 free(p);
933
934                 if (b)
935                         return;
936         }
937
938         log_warning("/etc/mtab is not a symlink or not pointing to /proc/self/mounts. "
939                     "This is not supported anymore. "
940                     "Please make sure to replace this file by a symlink to avoid incorrect or misleading mount(8) output.");
941 }
942
943 static void test_usr(void) {
944         struct stat a, b;
945         bool seperate = false;
946
947         /* Check that /usr is not a seperate fs */
948
949         if (lstat("/", &a) >= 0 && lstat("/usr", &b) >= 0)
950                 if (a.st_dev != b.st_dev)
951                         seperate = true;
952
953         /* This check won't work usually during boot, since /usr is
954          * probably not mounted yet, hence let's add a second
955          * check. We just check whether /usr is an empty directory. */
956
957         if (dir_is_empty("/usr") > 0)
958                 seperate = true;
959
960         if (!seperate)
961                 return;
962
963         log_warning("/usr appears to be on a different file system than /. This is not supported anymore. "
964                     "Some things will probably break (sometimes even silently) in mysterious ways.");
965 }
966
967 int main(int argc, char *argv[]) {
968         Manager *m = NULL;
969         int r, retval = EXIT_FAILURE;
970         FDSet *fds = NULL;
971         bool reexecute = false;
972         const char *shutdown_verb = NULL;
973         dual_timestamp initrd_timestamp = { 0ULL, 0ULL };
974         char systemd[] = "systemd";
975
976         if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
977                 /* This is compatbility support for SysV, where
978                  * calling init as a user is identical to telinit. */
979
980                 errno = -ENOENT;
981                 execv(SYSTEMCTL_BINARY_PATH, argv);
982                 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
983                 return 1;
984         }
985
986         /* If we get started via the /sbin/init symlink then we are
987            called 'init'. After a subsequent reexecution we are then
988            called 'systemd'. That is confusing, hence let's call us
989            systemd right-away. */
990
991         program_invocation_short_name = systemd;
992         prctl(PR_SET_NAME, systemd);
993
994         log_show_color(isatty(STDERR_FILENO) > 0);
995         log_show_location(false);
996         log_set_max_level(LOG_INFO);
997
998         if (getpid() == 1) {
999                 arg_running_as = MANAGER_SYSTEM;
1000                 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
1001
1002                 /* This might actually not return, but cause a
1003                  * reexecution */
1004                 if (selinux_setup(argv) < 0)
1005                         goto finish;
1006
1007                 if (label_init() < 0)
1008                         goto finish;
1009         } else {
1010                 arg_running_as = MANAGER_USER;
1011                 log_set_target(LOG_TARGET_CONSOLE);
1012         }
1013
1014         if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
1015                 goto finish;
1016
1017         /* Mount /proc, /sys and friends, so that /proc/cmdline and
1018          * /proc/$PID/fd is available. */
1019         if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
1020                 if (mount_setup() < 0)
1021                         goto finish;
1022
1023         /* Reset all signal handlers. */
1024         assert_se(reset_all_signal_handlers() == 0);
1025
1026         /* If we are init, we can block sigkill. Yay. */
1027         ignore_signals(SIGNALS_IGNORE, -1);
1028
1029         if (parse_config_file() < 0)
1030                 goto finish;
1031
1032         if (arg_running_as == MANAGER_SYSTEM)
1033                 if (parse_proc_cmdline() < 0)
1034                         goto finish;
1035
1036         log_parse_environment();
1037
1038         if (parse_argv(argc, argv) < 0)
1039                 goto finish;
1040
1041         if (arg_action == ACTION_TEST && geteuid() == 0) {
1042                 log_error("Don't run test mode as root.");
1043                 goto finish;
1044         }
1045
1046         /* If Plymouth is being run make sure we show the status, so
1047          * that there's something nice to see when people press Esc */
1048         if (access("/dev/.systemd/plymouth", F_OK) >= 0)
1049                 arg_show_status = true;
1050
1051         if (arg_action == ACTION_HELP) {
1052                 retval = help();
1053                 goto finish;
1054         } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
1055                 unit_dump_config_items(stdout);
1056                 retval = EXIT_SUCCESS;
1057                 goto finish;
1058         } else if (arg_action == ACTION_DONE) {
1059                 retval = EXIT_SUCCESS;
1060                 goto finish;
1061         }
1062
1063         assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
1064
1065         /* Remember open file descriptors for later deserialization */
1066         if (serialization) {
1067                 if ((r = fdset_new_fill(&fds)) < 0) {
1068                         log_error("Failed to allocate fd set: %s", strerror(-r));
1069                         goto finish;
1070                 }
1071
1072                 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
1073         } else
1074                 close_all_fds(NULL, 0);
1075
1076         /* Set up PATH unless it is already set */
1077         setenv("PATH",
1078                "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
1079                arg_running_as == MANAGER_SYSTEM);
1080
1081         if (arg_running_as == MANAGER_SYSTEM) {
1082                 /* Parse the data passed to us by the initrd and unset it */
1083                 parse_initrd_timestamp(&initrd_timestamp);
1084                 filter_environ("RD_");
1085
1086                 /* Unset some environment variables passed in from the
1087                  * kernel that don't really make sense for us. */
1088                 unsetenv("HOME");
1089                 unsetenv("TERM");
1090         }
1091
1092         /* Move out of the way, so that we won't block unmounts */
1093         assert_se(chdir("/")  == 0);
1094
1095         if (arg_running_as == MANAGER_SYSTEM) {
1096                 /* Become a session leader if we aren't one yet. */
1097                 setsid();
1098
1099                 /* Disable the umask logic */
1100                 umask(0);
1101         }
1102
1103         /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
1104         dbus_connection_set_change_sigpipe(FALSE);
1105
1106         /* Reset the console, but only if this is really init and we
1107          * are freshly booted */
1108         if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
1109                 console_setup(getpid() == 1 && !serialization);
1110                 make_null_stdio();
1111         }
1112
1113         /* Open the logging devices, if possible and necessary */
1114         log_open();
1115
1116         /* Make sure we leave a core dump without panicing the
1117          * kernel. */
1118         if (getpid() == 1)
1119                 install_crash_handler();
1120
1121         log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,
1122                  PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES "; " DISTRIBUTION ")", manager_running_as_to_string(arg_running_as));
1123
1124         if (arg_running_as == MANAGER_SYSTEM && !serialization) {
1125                 locale_setup();
1126
1127                 if (arg_show_status)
1128                         status_welcome();
1129
1130                 kmod_setup();
1131                 hostname_setup();
1132                 loopback_setup();
1133
1134                 mkdir_p("/dev/.systemd/ask-password/", 0755);
1135
1136                 test_mtab();
1137                 test_usr();
1138         }
1139
1140         if ((r = manager_new(arg_running_as, &m)) < 0) {
1141                 log_error("Failed to allocate manager object: %s", strerror(-r));
1142                 goto finish;
1143         }
1144
1145         m->confirm_spawn = arg_confirm_spawn;
1146         m->show_status = arg_show_status;
1147 #ifdef HAVE_SYSV_COMPAT
1148         m->sysv_console = arg_sysv_console;
1149 #endif
1150         m->mount_auto = arg_mount_auto;
1151         m->swap_auto = arg_swap_auto;
1152         m->default_std_output = arg_default_std_output;
1153         m->default_std_error = arg_default_std_error;
1154
1155         if (dual_timestamp_is_set(&initrd_timestamp))
1156                 m->initrd_timestamp = initrd_timestamp;
1157
1158         if (arg_default_controllers)
1159                 manager_set_default_controllers(m, arg_default_controllers);
1160
1161         if ((r = manager_startup(m, serialization, fds)) < 0)
1162                 log_error("Failed to fully start up daemon: %s", strerror(-r));
1163
1164         if (fds) {
1165                 /* This will close all file descriptors that were opened, but
1166                  * not claimed by any unit. */
1167
1168                 fdset_free(fds);
1169                 fds = NULL;
1170         }
1171
1172         if (serialization) {
1173                 fclose(serialization);
1174                 serialization = NULL;
1175         } else {
1176                 DBusError error;
1177                 Unit *target = NULL;
1178
1179                 dbus_error_init(&error);
1180
1181                 log_debug("Activating default unit: %s", arg_default_unit);
1182
1183                 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1184                         log_error("Failed to load default target: %s", bus_error(&error, r));
1185                         dbus_error_free(&error);
1186                 } else if (target->meta.load_state == UNIT_ERROR)
1187                         log_error("Failed to load default target: %s", strerror(-target->meta.load_error));
1188                 else if (target->meta.load_state == UNIT_MASKED)
1189                         log_error("Default target masked.");
1190
1191                 if (!target || target->meta.load_state != UNIT_LOADED) {
1192                         log_info("Trying to load rescue target...");
1193
1194                         if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1195                                 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1196                                 dbus_error_free(&error);
1197                                 goto finish;
1198                         } else if (target->meta.load_state == UNIT_ERROR) {
1199                                 log_error("Failed to load rescue target: %s", strerror(-target->meta.load_error));
1200                                 goto finish;
1201                         } else if (target->meta.load_state == UNIT_MASKED) {
1202                                 log_error("Rescue target masked.");
1203                                 goto finish;
1204                         }
1205                 }
1206
1207                 assert(target->meta.load_state == UNIT_LOADED);
1208
1209                 if (arg_action == ACTION_TEST) {
1210                         printf("-> By units:\n");
1211                         manager_dump_units(m, stdout, "\t");
1212                 }
1213
1214                 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1215                         log_error("Failed to start default target: %s", bus_error(&error, r));
1216                         dbus_error_free(&error);
1217                         goto finish;
1218                 }
1219
1220                 if (arg_action == ACTION_TEST) {
1221                         printf("-> By jobs:\n");
1222                         manager_dump_jobs(m, stdout, "\t");
1223                         retval = EXIT_SUCCESS;
1224                         goto finish;
1225                 }
1226         }
1227
1228         for (;;) {
1229                 if ((r = manager_loop(m)) < 0) {
1230                         log_error("Failed to run mainloop: %s", strerror(-r));
1231                         goto finish;
1232                 }
1233
1234                 switch (m->exit_code) {
1235
1236                 case MANAGER_EXIT:
1237                         retval = EXIT_SUCCESS;
1238                         log_debug("Exit.");
1239                         goto finish;
1240
1241                 case MANAGER_RELOAD:
1242                         log_info("Reloading.");
1243                         if ((r = manager_reload(m)) < 0)
1244                                 log_error("Failed to reload: %s", strerror(-r));
1245                         break;
1246
1247                 case MANAGER_REEXECUTE:
1248                         if (prepare_reexecute(m, &serialization, &fds) < 0)
1249                                 goto finish;
1250
1251                         reexecute = true;
1252                         log_notice("Reexecuting.");
1253                         goto finish;
1254
1255                 case MANAGER_REBOOT:
1256                 case MANAGER_POWEROFF:
1257                 case MANAGER_HALT:
1258                 case MANAGER_KEXEC: {
1259                         static const char * const table[_MANAGER_EXIT_CODE_MAX] = {
1260                                 [MANAGER_REBOOT] = "reboot",
1261                                 [MANAGER_POWEROFF] = "poweroff",
1262                                 [MANAGER_HALT] = "halt",
1263                                 [MANAGER_KEXEC] = "kexec"
1264                         };
1265
1266                         assert_se(shutdown_verb = table[m->exit_code]);
1267
1268                         log_notice("Shutting down.");
1269                         goto finish;
1270                 }
1271
1272                 default:
1273                         assert_not_reached("Unknown exit code.");
1274                 }
1275         }
1276
1277 finish:
1278         if (m)
1279                 manager_free(m);
1280
1281         free(arg_default_unit);
1282         strv_free(arg_default_controllers);
1283
1284         dbus_shutdown();
1285
1286         label_finish();
1287
1288         if (reexecute) {
1289                 const char *args[15];
1290                 unsigned i = 0;
1291                 char sfd[16];
1292
1293                 assert(serialization);
1294                 assert(fds);
1295
1296                 args[i++] = SYSTEMD_BINARY_PATH;
1297
1298                 args[i++] = "--log-level";
1299                 args[i++] = log_level_to_string(log_get_max_level());
1300
1301                 args[i++] = "--log-target";
1302                 args[i++] = log_target_to_string(log_get_target());
1303
1304                 if (arg_running_as == MANAGER_SYSTEM)
1305                         args[i++] = "--system";
1306                 else
1307                         args[i++] = "--user";
1308
1309                 if (arg_dump_core)
1310                         args[i++] = "--dump-core";
1311
1312                 if (arg_crash_shell)
1313                         args[i++] = "--crash-shell";
1314
1315                 if (arg_confirm_spawn)
1316                         args[i++] = "--confirm-spawn";
1317
1318                 if (arg_show_status)
1319                         args[i++] = "--show-status=1";
1320                 else
1321                         args[i++] = "--show-status=0";
1322
1323 #ifdef HAVE_SYSV_COMPAT
1324                 if (arg_sysv_console)
1325                         args[i++] = "--sysv-console=1";
1326                 else
1327                         args[i++] = "--sysv-console=0";
1328 #endif
1329
1330                 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1331                 char_array_0(sfd);
1332
1333                 args[i++] = "--deserialize";
1334                 args[i++] = sfd;
1335
1336                 args[i++] = NULL;
1337
1338                 assert(i <= ELEMENTSOF(args));
1339
1340                 execv(args[0], (char* const*) args);
1341
1342                 log_error("Failed to reexecute: %m");
1343         }
1344
1345         if (serialization)
1346                 fclose(serialization);
1347
1348         if (fds)
1349                 fdset_free(fds);
1350
1351         if (shutdown_verb) {
1352                 const char * command_line[] = {
1353                         SYSTEMD_SHUTDOWN_BINARY_PATH,
1354                         shutdown_verb,
1355                         NULL
1356                 };
1357
1358                 execv(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line);
1359                 log_error("Failed to execute shutdown binary, freezing: %m");
1360         }
1361
1362         if (getpid() == 1)
1363                 freeze();
1364
1365         return retval;
1366 }