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b1b2a107 FF |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 ProFUSION embedded systems | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
b1b2a107 FF |
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 | |
5430f7f2 | 16 | Lesser General Public License for more details. |
b1b2a107 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
b1b2a107 FF |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
b1b2a107 | 22 | #include <errno.h> |
07630cea LP |
23 | #include <getopt.h> |
24 | #include <linux/reboot.h> | |
b1b2a107 FF |
25 | #include <signal.h> |
26 | #include <stdbool.h> | |
27 | #include <stdlib.h> | |
07630cea LP |
28 | #include <sys/mman.h> |
29 | #include <sys/mount.h> | |
30 | #include <sys/reboot.h> | |
31 | #include <sys/stat.h> | |
32 | #include <unistd.h> | |
b1b2a107 | 33 | |
07630cea LP |
34 | #include "cgroup-util.h" |
35 | #include "def.h" | |
ec26be51 | 36 | #include "fileio.h" |
07630cea LP |
37 | #include "killall.h" |
38 | #include "log.h" | |
39 | #include "missing.h" | |
6bedfcbb | 40 | #include "parse-util.h" |
07630cea LP |
41 | #include "process-util.h" |
42 | #include "string-util.h" | |
43 | #include "switch-root.h" | |
44 | #include "terminal-util.h" | |
b1b2a107 FF |
45 | #include "umount.h" |
46 | #include "util.h" | |
b52aae1d | 47 | #include "virt.h" |
e96d6be7 | 48 | #include "watchdog.h" |
b1b2a107 | 49 | |
b1b2a107 | 50 | #define FINALIZE_ATTEMPTS 50 |
b1b2a107 | 51 | |
b1e90ec5 | 52 | static char* arg_verb; |
287419c1 | 53 | static uint8_t arg_exit_code; |
b1e90ec5 ZJS |
54 | |
55 | static int parse_argv(int argc, char *argv[]) { | |
56 | enum { | |
57 | ARG_LOG_LEVEL = 0x100, | |
58 | ARG_LOG_TARGET, | |
59 | ARG_LOG_COLOR, | |
60 | ARG_LOG_LOCATION, | |
287419c1 | 61 | ARG_EXIT_CODE, |
b1e90ec5 ZJS |
62 | }; |
63 | ||
64 | static const struct option options[] = { | |
65 | { "log-level", required_argument, NULL, ARG_LOG_LEVEL }, | |
66 | { "log-target", required_argument, NULL, ARG_LOG_TARGET }, | |
67 | { "log-color", optional_argument, NULL, ARG_LOG_COLOR }, | |
68 | { "log-location", optional_argument, NULL, ARG_LOG_LOCATION }, | |
287419c1 | 69 | { "exit-code", required_argument, NULL, ARG_EXIT_CODE }, |
b1e90ec5 ZJS |
70 | {} |
71 | }; | |
72 | ||
73 | int c, r; | |
74 | ||
75 | assert(argc >= 1); | |
76 | assert(argv); | |
77 | ||
4b5d8d0f MS |
78 | /* "-" prevents getopt from permuting argv[] and moving the verb away |
79 | * from argv[1]. Our interface to initrd promises it'll be there. */ | |
80 | while ((c = getopt_long(argc, argv, "-", options, NULL)) >= 0) | |
b1e90ec5 ZJS |
81 | switch (c) { |
82 | ||
83 | case ARG_LOG_LEVEL: | |
84 | r = log_set_max_level_from_string(optarg); | |
85 | if (r < 0) | |
86 | log_error("Failed to parse log level %s, ignoring.", optarg); | |
87 | ||
88 | break; | |
89 | ||
90 | case ARG_LOG_TARGET: | |
91 | r = log_set_target_from_string(optarg); | |
92 | if (r < 0) | |
93 | log_error("Failed to parse log target %s, ignoring", optarg); | |
94 | ||
95 | break; | |
96 | ||
97 | case ARG_LOG_COLOR: | |
98 | ||
99 | if (optarg) { | |
100 | r = log_show_color_from_string(optarg); | |
101 | if (r < 0) | |
102 | log_error("Failed to parse log color setting %s, ignoring", optarg); | |
103 | } else | |
104 | log_show_color(true); | |
105 | ||
106 | break; | |
107 | ||
108 | case ARG_LOG_LOCATION: | |
109 | if (optarg) { | |
110 | r = log_show_location_from_string(optarg); | |
111 | if (r < 0) | |
112 | log_error("Failed to parse log location setting %s, ignoring", optarg); | |
113 | } else | |
114 | log_show_location(true); | |
115 | ||
116 | break; | |
117 | ||
287419c1 AC |
118 | case ARG_EXIT_CODE: |
119 | r = safe_atou8(optarg, &arg_exit_code); | |
120 | if (r < 0) | |
121 | log_error("Failed to parse exit code %s, ignoring", optarg); | |
122 | ||
123 | break; | |
124 | ||
4b5d8d0f MS |
125 | case '\001': |
126 | if (!arg_verb) | |
127 | arg_verb = optarg; | |
128 | else | |
129 | log_error("Excess arguments, ignoring"); | |
130 | break; | |
131 | ||
b1e90ec5 | 132 | case '?': |
b1e90ec5 ZJS |
133 | return -EINVAL; |
134 | ||
135 | default: | |
136 | assert_not_reached("Unhandled option code."); | |
137 | } | |
138 | ||
4b5d8d0f | 139 | if (!arg_verb) { |
b1e90ec5 ZJS |
140 | log_error("Verb argument missing."); |
141 | return -EINVAL; | |
142 | } | |
143 | ||
b1e90ec5 ZJS |
144 | return 0; |
145 | } | |
146 | ||
5a4bf02f | 147 | static int switch_root_initramfs(void) { |
4a62c710 MS |
148 | if (mount("/run/initramfs", "/run/initramfs", NULL, MS_BIND, NULL) < 0) |
149 | return log_error_errno(errno, "Failed to mount bind /run/initramfs on /run/initramfs: %m"); | |
89d471d5 | 150 | |
4a62c710 MS |
151 | if (mount(NULL, "/run/initramfs", NULL, MS_PRIVATE, NULL) < 0) |
152 | return log_error_errno(errno, "Failed to make /run/initramfs private mount: %m"); | |
89d471d5 | 153 | |
f131770b | 154 | /* switch_root with MS_BIND, because there might still be processes lurking around, which have open file descriptors. |
5a4bf02f HH |
155 | * /run/initramfs/shutdown will take care of these. |
156 | * Also do not detach the old root, because /run/initramfs/shutdown needs to access it. | |
157 | */ | |
158 | return switch_root("/run/initramfs", "/oldroot", false, MS_BIND); | |
7cb1094a HH |
159 | } |
160 | ||
7cb1094a | 161 | |
b1b2a107 | 162 | int main(int argc, char *argv[]) { |
8c977838 | 163 | bool need_umount, need_swapoff, need_loop_detach, need_dm_detach; |
bd3fa1d2 | 164 | bool in_container, use_watchdog = false; |
06beed6d | 165 | _cleanup_free_ char *cgroup = NULL; |
6edd7d0a | 166 | char *arguments[3]; |
41f85451 LP |
167 | unsigned retries; |
168 | int cmd, r; | |
e801700e | 169 | static const char* const dirs[] = {SYSTEM_SHUTDOWN_PATH, NULL}; |
b1b2a107 | 170 | |
b1e90ec5 ZJS |
171 | log_parse_environment(); |
172 | r = parse_argv(argc, argv); | |
173 | if (r < 0) | |
174 | goto error; | |
ec26be51 | 175 | |
b1e90ec5 | 176 | /* journald will die if not gone yet. The log target defaults |
3f85ef0f | 177 | * to console, but may have been changed by command line options. */ |
ec26be51 | 178 | |
99f09825 | 179 | log_close_console(); /* force reopen of /dev/console */ |
b1b2a107 FF |
180 | log_open(); |
181 | ||
4c12626c LP |
182 | umask(0022); |
183 | ||
b1b2a107 | 184 | if (getpid() != 1) { |
b1e90ec5 | 185 | log_error("Not executed by init (PID 1)."); |
b1b2a107 FF |
186 | r = -EPERM; |
187 | goto error; | |
188 | } | |
189 | ||
b1e90ec5 | 190 | if (streq(arg_verb, "reboot")) |
b1b2a107 | 191 | cmd = RB_AUTOBOOT; |
b1e90ec5 | 192 | else if (streq(arg_verb, "poweroff")) |
b1b2a107 | 193 | cmd = RB_POWER_OFF; |
b1e90ec5 | 194 | else if (streq(arg_verb, "halt")) |
b1b2a107 | 195 | cmd = RB_HALT_SYSTEM; |
b1e90ec5 | 196 | else if (streq(arg_verb, "kexec")) |
b1b2a107 | 197 | cmd = LINUX_REBOOT_CMD_KEXEC; |
287419c1 AC |
198 | else if (streq(arg_verb, "exit")) |
199 | cmd = 0; /* ignored, just checking that arg_verb is valid */ | |
b1b2a107 | 200 | else { |
b1b2a107 | 201 | r = -EINVAL; |
b1e90ec5 | 202 | log_error("Unknown action '%s'.", arg_verb); |
b1b2a107 FF |
203 | goto error; |
204 | } | |
205 | ||
41f85451 LP |
206 | cg_get_root_path(&cgroup); |
207 | ||
e96d6be7 LP |
208 | use_watchdog = !!getenv("WATCHDOG_USEC"); |
209 | ||
b1b2a107 | 210 | /* lock us into memory */ |
b55d0651 | 211 | mlockall(MCL_CURRENT|MCL_FUTURE); |
b1b2a107 | 212 | |
ab58e291 | 213 | log_info("Sending SIGTERM to remaining processes..."); |
0bee65f0 | 214 | broadcast_signal(SIGTERM, true, true); |
b1b2a107 | 215 | |
ab58e291 | 216 | log_info("Sending SIGKILL to remaining processes..."); |
0bee65f0 | 217 | broadcast_signal(SIGKILL, true, false); |
40e85d00 | 218 | |
75f86906 | 219 | in_container = detect_container() > 0; |
8c977838 | 220 | |
d89b5fed | 221 | need_umount = !in_container; |
8c977838 ZJS |
222 | need_swapoff = !in_container; |
223 | need_loop_detach = !in_container; | |
224 | need_dm_detach = !in_container; | |
b1b2a107 | 225 | |
567ea02a | 226 | /* Unmount all mountpoints, swaps, and loopback devices */ |
12aad1d0 LP |
227 | for (retries = 0; retries < FINALIZE_ATTEMPTS; retries++) { |
228 | bool changed = false; | |
229 | ||
e96d6be7 LP |
230 | if (use_watchdog) |
231 | watchdog_ping(); | |
232 | ||
41f85451 LP |
233 | /* Let's trim the cgroup tree on each iteration so |
234 | that we leave an empty cgroup tree around, so that | |
235 | container managers get a nice notify event when we | |
236 | are down */ | |
237 | if (cgroup) | |
238 | cg_trim(SYSTEMD_CGROUP_CONTROLLER, cgroup, false); | |
239 | ||
b1b2a107 | 240 | if (need_umount) { |
ab58e291 | 241 | log_info("Unmounting file systems."); |
12aad1d0 | 242 | r = umount_all(&changed); |
bce93b7a | 243 | if (r == 0) { |
b1b2a107 | 244 | need_umount = false; |
bce93b7a MS |
245 | log_info("All filesystems unmounted."); |
246 | } else if (r > 0) | |
ab58e291 | 247 | log_info("Not all file systems unmounted, %d left.", r); |
b1b2a107 | 248 | else |
da927ba9 | 249 | log_error_errno(r, "Failed to unmount file systems: %m"); |
b1b2a107 FF |
250 | } |
251 | ||
252 | if (need_swapoff) { | |
735e0712 | 253 | log_info("Deactivating swaps."); |
12aad1d0 | 254 | r = swapoff_all(&changed); |
bce93b7a | 255 | if (r == 0) { |
b1b2a107 | 256 | need_swapoff = false; |
735e0712 | 257 | log_info("All swaps deactivated."); |
bce93b7a | 258 | } else if (r > 0) |
735e0712 | 259 | log_info("Not all swaps deactivated, %d left.", r); |
b1b2a107 | 260 | else |
da927ba9 | 261 | log_error_errno(r, "Failed to deactivate swaps: %m"); |
b1b2a107 FF |
262 | } |
263 | ||
264 | if (need_loop_detach) { | |
265 | log_info("Detaching loop devices."); | |
12aad1d0 | 266 | r = loopback_detach_all(&changed); |
bce93b7a | 267 | if (r == 0) { |
b1b2a107 | 268 | need_loop_detach = false; |
bce93b7a MS |
269 | log_info("All loop devices detached."); |
270 | } else if (r > 0) | |
ab58e291 | 271 | log_info("Not all loop devices detached, %d left.", r); |
b1b2a107 | 272 | else |
da927ba9 | 273 | log_error_errno(r, "Failed to detach loop devices: %m"); |
d48141ba | 274 | } |
b1b2a107 | 275 | |
d48141ba LP |
276 | if (need_dm_detach) { |
277 | log_info("Detaching DM devices."); | |
12aad1d0 | 278 | r = dm_detach_all(&changed); |
bce93b7a | 279 | if (r == 0) { |
d48141ba | 280 | need_dm_detach = false; |
bce93b7a MS |
281 | log_info("All DM devices detached."); |
282 | } else if (r > 0) | |
2569a5ce | 283 | log_info("Not all DM devices detached, %d left.", r); |
d48141ba | 284 | else |
da927ba9 | 285 | log_error_errno(r, "Failed to detach DM devices: %m"); |
b1b2a107 FF |
286 | } |
287 | ||
a27d2184 KS |
288 | if (!need_umount && !need_swapoff && !need_loop_detach && !need_dm_detach) { |
289 | if (retries > 0) | |
290 | log_info("All filesystems, swaps, loop devices, DM devices detached."); | |
12aad1d0 | 291 | /* Yay, done */ |
8c977838 | 292 | goto initrd_jump; |
a27d2184 | 293 | } |
b1b2a107 | 294 | |
12aad1d0 | 295 | /* If in this iteration we didn't manage to |
bd3fa1d2 | 296 | * unmount/deactivate anything, we simply give up */ |
12aad1d0 | 297 | if (!changed) { |
8c977838 ZJS |
298 | log_info("Cannot finalize remaining%s%s%s%s continuing.", |
299 | need_umount ? " file systems," : "", | |
300 | need_swapoff ? " swap devices," : "", | |
301 | need_loop_detach ? " loop devices," : "", | |
302 | need_dm_detach ? " DM devices," : ""); | |
303 | goto initrd_jump; | |
12aad1d0 LP |
304 | } |
305 | ||
8c977838 ZJS |
306 | log_debug("After %u retries, couldn't finalize remaining %s%s%s%s trying again.", |
307 | retries + 1, | |
308 | need_umount ? " file systems," : "", | |
309 | need_swapoff ? " swap devices," : "", | |
310 | need_loop_detach ? " loop devices," : "", | |
311 | need_dm_detach ? " DM devices," : ""); | |
b1b2a107 FF |
312 | } |
313 | ||
8c977838 ZJS |
314 | log_error("Too many iterations, giving up."); |
315 | ||
316 | initrd_jump: | |
12aad1d0 | 317 | |
6edd7d0a | 318 | arguments[0] = NULL; |
b1e90ec5 | 319 | arguments[1] = arg_verb; |
6edd7d0a | 320 | arguments[2] = NULL; |
e801700e | 321 | execute_directories(dirs, DEFAULT_TIMEOUT_USEC, arguments); |
83cc030f | 322 | |
02eaa788 | 323 | if (!in_container && !in_initrd() && |
cb7ec564 | 324 | access("/run/initramfs/shutdown", X_OK) == 0) { |
5a4bf02f HH |
325 | r = switch_root_initramfs(); |
326 | if (r >= 0) { | |
a2726e5c | 327 | argv[0] = (char*) "/shutdown"; |
30d743f4 | 328 | |
5a4bf02f HH |
329 | setsid(); |
330 | make_console_stdio(); | |
331 | ||
332 | log_info("Successfully changed into root pivot.\n" | |
333 | "Returning to initrd..."); | |
30d743f4 | 334 | |
a2726e5c | 335 | execv("/shutdown", argv); |
56f64d95 | 336 | log_error_errno(errno, "Failed to execute shutdown binary: %m"); |
5a4bf02f | 337 | } else |
da927ba9 | 338 | log_error_errno(r, "Failed to switch root to \"/run/initramfs\": %m"); |
5a4bf02f | 339 | |
7cb1094a HH |
340 | } |
341 | ||
8c977838 ZJS |
342 | if (need_umount || need_swapoff || need_loop_detach || need_dm_detach) |
343 | log_error("Failed to finalize %s%s%s%s ignoring", | |
344 | need_umount ? " file systems," : "", | |
345 | need_swapoff ? " swap devices," : "", | |
346 | need_loop_detach ? " loop devices," : "", | |
347 | need_dm_detach ? " DM devices," : ""); | |
348 | ||
0049f05a LP |
349 | /* The kernel will automaticall flush ATA disks and suchlike |
350 | * on reboot(), but the file systems need to be synce'd | |
351 | * explicitly in advance. So let's do this here, but not | |
352 | * needlessly slow down containers. */ | |
353 | if (!in_container) | |
354 | sync(); | |
355 | ||
287419c1 AC |
356 | if (streq(arg_verb, "exit")) { |
357 | if (in_container) | |
358 | exit(arg_exit_code); | |
359 | else { | |
360 | /* We cannot exit() on the host, fallback on another | |
361 | * method. */ | |
362 | cmd = RB_POWER_OFF; | |
363 | } | |
364 | } | |
365 | ||
477def80 LP |
366 | switch (cmd) { |
367 | ||
368 | case LINUX_REBOOT_CMD_KEXEC: | |
cb7ec564 LP |
369 | |
370 | if (!in_container) { | |
371 | /* We cheat and exec kexec to avoid doing all its work */ | |
477def80 LP |
372 | pid_t pid; |
373 | ||
374 | log_info("Rebooting with kexec."); | |
cb7ec564 | 375 | |
477def80 | 376 | pid = fork(); |
cb7ec564 | 377 | if (pid < 0) |
56f64d95 | 378 | log_error_errno(errno, "Failed to fork: %m"); |
477def80 LP |
379 | else if (pid == 0) { |
380 | ||
381 | const char * const args[] = { | |
382 | KEXEC, "-e", NULL | |
383 | }; | |
384 | ||
cb7ec564 | 385 | /* Child */ |
477def80 | 386 | |
cb7ec564 | 387 | execv(args[0], (char * const *) args); |
477def80 LP |
388 | _exit(EXIT_FAILURE); |
389 | } else | |
820d3acf | 390 | wait_for_terminate_and_warn("kexec", pid, true); |
b1b2a107 | 391 | } |
e61cd186 LP |
392 | |
393 | cmd = RB_AUTOBOOT; | |
477def80 | 394 | /* Fall through */ |
b1b2a107 | 395 | |
477def80 LP |
396 | case RB_AUTOBOOT: |
397 | ||
398 | if (!in_container) { | |
399 | _cleanup_free_ char *param = NULL; | |
400 | ||
401 | if (read_one_line_file(REBOOT_PARAM_FILE, ¶m) >= 0) { | |
402 | log_info("Rebooting with argument '%s'.", param); | |
f07756bf | 403 | syscall(SYS_reboot, LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_RESTART2, param); |
477def80 LP |
404 | } |
405 | } | |
406 | ||
407 | log_info("Rebooting."); | |
408 | break; | |
409 | ||
410 | case RB_POWER_OFF: | |
411 | log_info("Powering off."); | |
412 | break; | |
413 | ||
414 | case RB_HALT_SYSTEM: | |
415 | log_info("Halting system."); | |
416 | break; | |
417 | ||
418 | default: | |
419 | assert_not_reached("Unknown magic"); | |
420 | } | |
cb7ec564 | 421 | |
477def80 | 422 | reboot(cmd); |
cb7ec564 LP |
423 | if (errno == EPERM && in_container) { |
424 | /* If we are in a container, and we lacked | |
425 | * CAP_SYS_BOOT just exit, this will kill our | |
426 | * container for good. */ | |
477def80 | 427 | log_info("Exiting container."); |
cb7ec564 LP |
428 | exit(0); |
429 | } | |
430 | ||
76ef789d | 431 | r = log_error_errno(errno, "Failed to invoke reboot(): %m"); |
b1b2a107 FF |
432 | |
433 | error: | |
da927ba9 | 434 | log_emergency_errno(r, "Critical error while doing system shutdown: %m"); |
b1b2a107 | 435 | freeze(); |
b1b2a107 | 436 | } |