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