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Commit | Line | Data |
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60918275 LP |
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
2 | ||
a7334b09 LP |
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 | ||
ea430986 LP |
22 | #include <dbus/dbus.h> |
23 | ||
60918275 LP |
24 | #include <stdio.h> |
25 | #include <errno.h> | |
26 | #include <string.h> | |
16354eff | 27 | #include <unistd.h> |
4ade7963 LP |
28 | #include <sys/types.h> |
29 | #include <sys/stat.h> | |
f170852a | 30 | #include <getopt.h> |
97c4f35c | 31 | #include <signal.h> |
4fc935ca | 32 | #include <sys/wait.h> |
60918275 LP |
33 | |
34 | #include "manager.h" | |
16354eff | 35 | #include "log.h" |
4ade7963 | 36 | #include "mount-setup.h" |
302e8c4c LP |
37 | #include "hostname-setup.h" |
38 | #include "load-fragment.h" | |
60918275 | 39 | |
f170852a LP |
40 | static enum { |
41 | ACTION_RUN, | |
e965d56d | 42 | ACTION_HELP, |
e537352b LP |
43 | ACTION_TEST, |
44 | ACTION_DUMP_CONFIGURATION_ITEMS | |
f170852a LP |
45 | } action = ACTION_RUN; |
46 | ||
47 | static char *default_unit = NULL; | |
a5dab5ce | 48 | static ManagerRunningAs running_as = _MANAGER_RUNNING_AS_INVALID; |
4fc935ca | 49 | |
97c4f35c | 50 | static bool dump_core = true; |
4fc935ca | 51 | static bool crash_shell = true; |
97c4f35c LP |
52 | |
53 | _noreturn static void freeze(void) { | |
54 | for (;;) | |
55 | pause(); | |
56 | } | |
57 | ||
58 | _noreturn static void crash(int sig) { | |
59 | ||
60 | if (!dump_core) | |
61 | log_error("Caught <%s>, not dumping core.", strsignal(sig)); | |
62 | else { | |
63 | pid_t pid; | |
64 | ||
97c4f35c | 65 | if ((pid = fork()) < 0) |
4fc935ca | 66 | log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno)); |
97c4f35c LP |
67 | |
68 | else if (pid == 0) { | |
69 | struct sigaction sa; | |
70 | struct rlimit rl; | |
71 | ||
72 | /* Enable default signal handler for core dump */ | |
73 | zero(sa); | |
74 | sa.sa_handler = SIG_DFL; | |
75 | assert_se(sigaction(sig, &sa, NULL) == 0); | |
76 | ||
77 | /* Don't limit the core dump size */ | |
78 | zero(rl); | |
79 | rl.rlim_cur = RLIM_INFINITY; | |
80 | rl.rlim_max = RLIM_INFINITY; | |
81 | setrlimit(RLIMIT_CORE, &rl); | |
82 | ||
83 | /* Just to be sure... */ | |
84 | assert_se(chdir("/") == 0); | |
85 | ||
86 | /* Raise the signal again */ | |
87 | raise(sig); | |
88 | ||
89 | assert_not_reached("We shouldn't be here..."); | |
90 | _exit(1); | |
4fc935ca LP |
91 | |
92 | } else { | |
93 | int status, r; | |
94 | ||
95 | /* Order things nicely. */ | |
96 | if ((r = waitpid(pid, &status, 0)) < 0) | |
97 | log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno)); | |
98 | else if (!WCOREDUMP(status)) | |
99 | log_error("Caught <%s>, core dump failed.", strsignal(sig)); | |
100 | else | |
101 | log_error("Caught <%s>, dumped core as pid %llu.", strsignal(sig), (unsigned long long) pid); | |
97c4f35c LP |
102 | } |
103 | } | |
104 | ||
4fc935ca LP |
105 | if (crash_shell) { |
106 | log_info("Executing crash shell in 10s..."); | |
107 | sleep(10); | |
108 | ||
109 | execl("/bin/sh", "/bin/sh", NULL); | |
110 | log_error("execl() failed: %s", strerror(errno)); | |
111 | } | |
112 | ||
113 | log_info("Freezing execution."); | |
97c4f35c LP |
114 | freeze(); |
115 | } | |
116 | ||
117 | static void install_crash_handler(void) { | |
118 | struct sigaction sa; | |
119 | ||
120 | zero(sa); | |
121 | ||
122 | sa.sa_handler = crash; | |
123 | sa.sa_flags = SA_NODEFER; | |
124 | ||
125 | assert_se(sigaction(SIGSEGV, &sa, NULL) == 0); | |
126 | assert_se(sigaction(SIGABRT, &sa, NULL) == 0); | |
127 | } | |
f170852a LP |
128 | |
129 | static int set_default_unit(const char *u) { | |
130 | char *c; | |
131 | ||
132 | assert(u); | |
133 | ||
134 | if (!(c = strdup(u))) | |
135 | return -ENOMEM; | |
136 | ||
137 | free(default_unit); | |
138 | default_unit = c; | |
139 | return 0; | |
140 | } | |
141 | ||
142 | static int parse_proc_cmdline_word(const char *word) { | |
143 | ||
144 | static const char * const rlmap[] = { | |
145 | "single", SPECIAL_RUNLEVEL1_TARGET, | |
146 | "-s", SPECIAL_RUNLEVEL1_TARGET, | |
147 | "s", SPECIAL_RUNLEVEL1_TARGET, | |
148 | "S", SPECIAL_RUNLEVEL1_TARGET, | |
149 | "1", SPECIAL_RUNLEVEL1_TARGET, | |
150 | "2", SPECIAL_RUNLEVEL2_TARGET, | |
151 | "3", SPECIAL_RUNLEVEL3_TARGET, | |
152 | "4", SPECIAL_RUNLEVEL4_TARGET, | |
153 | "5", SPECIAL_RUNLEVEL5_TARGET | |
154 | }; | |
155 | ||
156 | if (startswith(word, "systemd.default=")) | |
82771ba1 | 157 | return set_default_unit(word + 16); |
f170852a LP |
158 | |
159 | else if (startswith(word, "systemd.log_target=")) { | |
160 | ||
161 | if (log_set_target_from_string(word + 19) < 0) | |
162 | log_warning("Failed to parse log target %s. Ignoring.", word + 19); | |
163 | ||
164 | } else if (startswith(word, "systemd.log_level=")) { | |
165 | ||
166 | if (log_set_max_level_from_string(word + 18) < 0) | |
167 | log_warning("Failed to parse log level %s. Ignoring.", word + 18); | |
168 | ||
4fc935ca LP |
169 | } else if (startswith(word, "systemd.dump_core=")) { |
170 | int r; | |
171 | ||
172 | if ((r = parse_boolean(word + 18)) < 0) | |
173 | log_warning("Failed to parse dump core switch %s, Ignoring", word + 18); | |
174 | else | |
175 | dump_core = r; | |
176 | ||
177 | } else if (startswith(word, "systemd.crash_shell=")) { | |
178 | int r; | |
179 | ||
180 | if ((r = parse_boolean(word + 20)) < 0) | |
181 | log_warning("Failed to parse crash shell switch %s, Ignoring", word + 20); | |
182 | else | |
183 | crash_shell = r; | |
184 | ||
185 | } else if (startswith(word, "systemd.")) { | |
186 | ||
187 | log_warning("Unknown kernel switch %s. Ignoring.", word); | |
188 | ||
189 | log_info("Supported kernel switches:"); | |
190 | log_info("systemd.default=UNIT Default unit to start"); | |
191 | log_info("systemd.log_target=console|kmsg|syslog Log target"); | |
192 | log_info("systemd.log_level=LEVEL Log level"); | |
193 | log_info("systemd.dump_core=0|1 Dump core on crash"); | |
194 | log_info("systemd.crash_shell=0|1 On crash run shell"); | |
195 | ||
f170852a LP |
196 | } else { |
197 | unsigned i; | |
198 | ||
199 | /* SysV compatibility */ | |
f170852a LP |
200 | for (i = 0; i < ELEMENTSOF(rlmap); i += 2) |
201 | if (streq(word, rlmap[i])) | |
202 | return set_default_unit(rlmap[i+1]); | |
203 | } | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | static int parse_proc_cmdline(void) { | |
209 | char *line; | |
210 | int r; | |
211 | char *w; | |
212 | size_t l; | |
213 | char *state; | |
214 | ||
215 | if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) { | |
216 | log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno)); | |
217 | return 0; | |
218 | } | |
219 | ||
220 | FOREACH_WORD_QUOTED(w, l, line, state) { | |
221 | char *word; | |
222 | ||
223 | if (!(word = strndup(w, l))) { | |
224 | r = -ENOMEM; | |
225 | goto finish; | |
226 | } | |
227 | ||
228 | r = parse_proc_cmdline_word(word); | |
229 | free(word); | |
230 | ||
231 | if (r < 0) | |
232 | goto finish; | |
233 | } | |
234 | ||
235 | r = 0; | |
236 | ||
237 | finish: | |
238 | free(line); | |
239 | return r; | |
240 | } | |
241 | ||
242 | static int parse_argv(int argc, char *argv[]) { | |
243 | ||
244 | enum { | |
245 | ARG_LOG_LEVEL = 0x100, | |
246 | ARG_LOG_TARGET, | |
a5dab5ce | 247 | ARG_DEFAULT, |
e965d56d | 248 | ARG_RUNNING_AS, |
e537352b LP |
249 | ARG_TEST, |
250 | ARG_DUMP_CONFIGURATION_ITEMS | |
f170852a LP |
251 | }; |
252 | ||
253 | static const struct option options[] = { | |
254 | { "log-level", required_argument, NULL, ARG_LOG_LEVEL }, | |
255 | { "log-target", required_argument, NULL, ARG_LOG_TARGET }, | |
256 | { "default", required_argument, NULL, ARG_DEFAULT }, | |
a5dab5ce | 257 | { "running-as", required_argument, NULL, ARG_RUNNING_AS }, |
e965d56d | 258 | { "test", no_argument, NULL, ARG_TEST }, |
f170852a | 259 | { "help", no_argument, NULL, 'h' }, |
e537352b | 260 | { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS }, |
f170852a LP |
261 | { NULL, 0, NULL, 0 } |
262 | }; | |
263 | ||
264 | int c, r; | |
265 | ||
266 | assert(argc >= 1); | |
267 | assert(argv); | |
268 | ||
269 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) | |
270 | ||
271 | switch (c) { | |
272 | ||
273 | case ARG_LOG_LEVEL: | |
274 | if ((r = log_set_max_level_from_string(optarg)) < 0) { | |
275 | log_error("Failed to parse log level %s.", optarg); | |
276 | return r; | |
277 | } | |
278 | ||
279 | break; | |
280 | ||
281 | case ARG_LOG_TARGET: | |
282 | ||
283 | if ((r = log_set_target_from_string(optarg)) < 0) { | |
284 | log_error("Failed to parse log target %s.", optarg); | |
285 | return r; | |
286 | } | |
287 | ||
288 | break; | |
289 | ||
290 | case ARG_DEFAULT: | |
291 | ||
292 | if ((r = set_default_unit(optarg)) < 0) { | |
293 | log_error("Failed to set default unit %s: %s", optarg, strerror(-r)); | |
294 | return r; | |
295 | } | |
296 | ||
297 | break; | |
298 | ||
a5dab5ce LP |
299 | case ARG_RUNNING_AS: { |
300 | ManagerRunningAs as; | |
301 | ||
302 | if ((as = manager_running_as_from_string(optarg)) < 0) { | |
303 | log_error("Failed to parse running as value %s", optarg); | |
304 | return -EINVAL; | |
305 | } | |
306 | ||
307 | running_as = as; | |
308 | break; | |
309 | } | |
310 | ||
e965d56d LP |
311 | case ARG_TEST: |
312 | action = ACTION_TEST; | |
313 | break; | |
314 | ||
e537352b LP |
315 | case ARG_DUMP_CONFIGURATION_ITEMS: |
316 | action = ACTION_DUMP_CONFIGURATION_ITEMS; | |
317 | break; | |
318 | ||
f170852a LP |
319 | case 'h': |
320 | action = ACTION_HELP; | |
321 | break; | |
322 | ||
323 | case '?': | |
324 | return -EINVAL; | |
325 | ||
326 | default: | |
327 | log_error("Unknown option code %c", c); | |
328 | return -EINVAL; | |
329 | } | |
330 | ||
f170852a LP |
331 | return 0; |
332 | } | |
333 | ||
334 | static int help(void) { | |
335 | ||
336 | printf("%s [options]\n\n" | |
e537352b LP |
337 | " -h --help Show this help\n" |
338 | " --default=UNIT Set default unit\n" | |
339 | " --log-level=LEVEL Set log level\n" | |
340 | " --log-target=TARGET Set log target (console, syslog, kmsg)\n" | |
341 | " --running-as=AS Set running as (init, system, session)\n" | |
342 | " --test Determine startup sequence, dump it and exit\n" | |
343 | " --dump-configuration-items Dump understood unit configuration items\n", | |
f170852a LP |
344 | __progname); |
345 | ||
346 | return 0; | |
347 | } | |
348 | ||
60918275 LP |
349 | int main(int argc, char *argv[]) { |
350 | Manager *m = NULL; | |
87f0e418 | 351 | Unit *target = NULL; |
60918275 LP |
352 | Job *job = NULL; |
353 | int r, retval = 1; | |
27b14a22 | 354 | |
a5dab5ce LP |
355 | if (getpid() == 1) |
356 | running_as = MANAGER_INIT; | |
357 | else if (getuid() == 0) | |
358 | running_as = MANAGER_SYSTEM; | |
359 | else | |
360 | running_as = MANAGER_SESSION; | |
361 | ||
f170852a LP |
362 | if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0) |
363 | goto finish; | |
60918275 | 364 | |
f170852a LP |
365 | /* Mount /proc, /sys and friends, so that /proc/cmdline and |
366 | * /proc/$PID/fd is available. */ | |
d89e521e LP |
367 | if (mount_setup() < 0) |
368 | goto finish; | |
4ade7963 LP |
369 | |
370 | /* Reset all signal handlers. */ | |
371 | assert_se(reset_all_signal_handlers() == 0); | |
372 | ||
f170852a LP |
373 | /* Close all open files */ |
374 | assert_se(close_all_fds(NULL, 0) == 0); | |
375 | ||
a5dab5ce LP |
376 | if (running_as != MANAGER_SESSION) |
377 | if (parse_proc_cmdline() < 0) | |
378 | goto finish; | |
f170852a LP |
379 | |
380 | log_parse_environment(); | |
381 | ||
382 | if (parse_argv(argc, argv) < 0) | |
383 | goto finish; | |
384 | ||
385 | if (action == ACTION_HELP) { | |
386 | retval = help(); | |
387 | goto finish; | |
e537352b LP |
388 | } else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) { |
389 | unit_dump_config_items(stdout); | |
390 | retval = 0; | |
391 | goto finish; | |
f170852a LP |
392 | } |
393 | ||
e965d56d | 394 | assert_se(action == ACTION_RUN || action == ACTION_TEST); |
f170852a | 395 | |
09082a94 | 396 | /* Set up PATH unless it is already set */ |
e537352b LP |
397 | setenv("PATH", |
398 | "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", | |
399 | running_as == MANAGER_INIT); | |
09082a94 | 400 | |
f170852a LP |
401 | /* Move out of the way, so that we won't block unmounts */ |
402 | assert_se(chdir("/") == 0); | |
403 | ||
4ade7963 LP |
404 | /* Become a session leader if we aren't one yet. */ |
405 | setsid(); | |
406 | ||
407 | /* Disable the umask logic */ | |
408 | umask(0); | |
409 | ||
410 | /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */ | |
411 | dbus_connection_set_change_sigpipe(FALSE); | |
412 | ||
18149b9f | 413 | /* Open the logging devices, if possible and necessary */ |
4ade7963 LP |
414 | log_open_syslog(); |
415 | log_open_kmsg(); | |
416 | ||
18149b9f | 417 | /* Make sure we leave a core dump */ |
4fc935ca LP |
418 | if (getpid() == 1) |
419 | install_crash_handler(); | |
97c4f35c | 420 | |
a5dab5ce LP |
421 | log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as)); |
422 | ||
302e8c4c | 423 | if (running_as == MANAGER_INIT) |
e537352b | 424 | hostname_setup(); |
302e8c4c | 425 | |
a5dab5ce | 426 | if ((r = manager_new(running_as, &m)) < 0) { |
8e274523 | 427 | log_error("Failed to allocate manager object: %s", strerror(-r)); |
60918275 LP |
428 | goto finish; |
429 | } | |
430 | ||
f50e0a01 LP |
431 | if ((r = manager_coldplug(m)) < 0) { |
432 | log_error("Failed to retrieve coldplug information: %s", strerror(-r)); | |
433 | goto finish; | |
434 | } | |
435 | ||
27b14a22 LP |
436 | log_debug("Activating default unit: %s", default_unit); |
437 | ||
438 | if ((r = manager_load_unit(m, default_unit, &target)) < 0) { | |
c22cbe26 | 439 | log_error("Failed to load default target: %s", strerror(-r)); |
37d88da7 LP |
440 | |
441 | log_info("Trying to load rescue target..."); | |
442 | if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, &target)) < 0) { | |
443 | log_error("Failed to load rescue target: %s", strerror(-r)); | |
444 | goto finish; | |
445 | } | |
60918275 LP |
446 | } |
447 | ||
e965d56d LP |
448 | if (action == ACTION_TEST) { |
449 | printf("→ By units:\n"); | |
450 | manager_dump_units(m, stdout, "\t"); | |
451 | } | |
d46de8a1 | 452 | |
8f5847c4 LP |
453 | if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) { |
454 | log_error("Failed to start default target: %s", strerror(-r)); | |
455 | goto finish; | |
456 | } | |
11dd41ce | 457 | |
e965d56d LP |
458 | if (action == ACTION_TEST) { |
459 | printf("→ By jobs:\n"); | |
460 | manager_dump_jobs(m, stdout, "\t"); | |
461 | ||
462 | if (getpid() == 1) | |
463 | pause(); | |
464 | ||
465 | retval = 0; | |
466 | goto finish; | |
467 | } | |
cea8e32e | 468 | |
c20cae32 LP |
469 | if ((r = manager_loop(m)) < 0) { |
470 | log_error("Failed to run mainloop: %s", strerror(-r)); | |
471 | goto finish; | |
472 | } | |
9152c765 | 473 | |
60918275 LP |
474 | retval = 0; |
475 | ||
f170852a LP |
476 | log_debug("Exit."); |
477 | ||
60918275 LP |
478 | finish: |
479 | if (m) | |
480 | manager_free(m); | |
481 | ||
f170852a | 482 | free(default_unit); |
b9cd2ec1 | 483 | |
ea430986 LP |
484 | dbus_shutdown(); |
485 | ||
60918275 LP |
486 | return retval; |
487 | } |