]>
Commit | Line | Data |
---|---|---|
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 | ||
22 | #include <sys/mman.h> | |
b1b2a107 FF |
23 | #include <sys/reboot.h> |
24 | #include <linux/reboot.h> | |
7cb1094a HH |
25 | #include <sys/stat.h> |
26 | #include <sys/mount.h> | |
b1b2a107 FF |
27 | #include <errno.h> |
28 | #include <unistd.h> | |
29 | #include <signal.h> | |
30 | #include <stdbool.h> | |
31 | #include <stdlib.h> | |
b1e90ec5 | 32 | #include <getopt.h> |
b1b2a107 | 33 | |
7cb1094a | 34 | #include "missing.h" |
b1b2a107 | 35 | #include "log.h" |
ec26be51 | 36 | #include "fileio.h" |
b1b2a107 FF |
37 | #include "umount.h" |
38 | #include "util.h" | |
b52aae1d | 39 | #include "virt.h" |
e96d6be7 | 40 | #include "watchdog.h" |
39d6464c | 41 | #include "killall.h" |
41f85451 | 42 | #include "cgroup-util.h" |
37185ec8 | 43 | #include "def.h" |
5a4bf02f | 44 | #include "switch-root.h" |
0b452006 | 45 | #include "process-util.h" |
288a74cc | 46 | #include "terminal-util.h" |
b1b2a107 | 47 | |
b1b2a107 | 48 | #define FINALIZE_ATTEMPTS 50 |
b1b2a107 | 49 | |
b1e90ec5 ZJS |
50 | static char* arg_verb; |
51 | ||
52 | static int parse_argv(int argc, char *argv[]) { | |
53 | enum { | |
54 | ARG_LOG_LEVEL = 0x100, | |
55 | ARG_LOG_TARGET, | |
56 | ARG_LOG_COLOR, | |
57 | ARG_LOG_LOCATION, | |
58 | }; | |
59 | ||
60 | static const struct option options[] = { | |
61 | { "log-level", required_argument, NULL, ARG_LOG_LEVEL }, | |
62 | { "log-target", required_argument, NULL, ARG_LOG_TARGET }, | |
63 | { "log-color", optional_argument, NULL, ARG_LOG_COLOR }, | |
64 | { "log-location", optional_argument, NULL, ARG_LOG_LOCATION }, | |
65 | {} | |
66 | }; | |
67 | ||
68 | int c, r; | |
69 | ||
70 | assert(argc >= 1); | |
71 | assert(argv); | |
72 | ||
4b5d8d0f MS |
73 | /* "-" prevents getopt from permuting argv[] and moving the verb away |
74 | * from argv[1]. Our interface to initrd promises it'll be there. */ | |
75 | while ((c = getopt_long(argc, argv, "-", options, NULL)) >= 0) | |
b1e90ec5 ZJS |
76 | switch (c) { |
77 | ||
78 | case ARG_LOG_LEVEL: | |
79 | r = log_set_max_level_from_string(optarg); | |
80 | if (r < 0) | |
81 | log_error("Failed to parse log level %s, ignoring.", optarg); | |
82 | ||
83 | break; | |
84 | ||
85 | case ARG_LOG_TARGET: | |
86 | r = log_set_target_from_string(optarg); | |
87 | if (r < 0) | |
88 | log_error("Failed to parse log target %s, ignoring", optarg); | |
89 | ||
90 | break; | |
91 | ||
92 | case ARG_LOG_COLOR: | |
93 | ||
94 | if (optarg) { | |
95 | r = log_show_color_from_string(optarg); | |
96 | if (r < 0) | |
97 | log_error("Failed to parse log color setting %s, ignoring", optarg); | |
98 | } else | |
99 | log_show_color(true); | |
100 | ||
101 | break; | |
102 | ||
103 | case ARG_LOG_LOCATION: | |
104 | if (optarg) { | |
105 | r = log_show_location_from_string(optarg); | |
106 | if (r < 0) | |
107 | log_error("Failed to parse log location setting %s, ignoring", optarg); | |
108 | } else | |
109 | log_show_location(true); | |
110 | ||
111 | break; | |
112 | ||
4b5d8d0f MS |
113 | case '\001': |
114 | if (!arg_verb) | |
115 | arg_verb = optarg; | |
116 | else | |
117 | log_error("Excess arguments, ignoring"); | |
118 | break; | |
119 | ||
b1e90ec5 | 120 | case '?': |
b1e90ec5 ZJS |
121 | return -EINVAL; |
122 | ||
123 | default: | |
124 | assert_not_reached("Unhandled option code."); | |
125 | } | |
126 | ||
4b5d8d0f | 127 | if (!arg_verb) { |
b1e90ec5 ZJS |
128 | log_error("Verb argument missing."); |
129 | return -EINVAL; | |
130 | } | |
131 | ||
b1e90ec5 ZJS |
132 | return 0; |
133 | } | |
134 | ||
5a4bf02f | 135 | static int switch_root_initramfs(void) { |
4a62c710 MS |
136 | if (mount("/run/initramfs", "/run/initramfs", NULL, MS_BIND, NULL) < 0) |
137 | return log_error_errno(errno, "Failed to mount bind /run/initramfs on /run/initramfs: %m"); | |
89d471d5 | 138 | |
4a62c710 MS |
139 | if (mount(NULL, "/run/initramfs", NULL, MS_PRIVATE, NULL) < 0) |
140 | return log_error_errno(errno, "Failed to make /run/initramfs private mount: %m"); | |
89d471d5 | 141 | |
f131770b | 142 | /* switch_root with MS_BIND, because there might still be processes lurking around, which have open file descriptors. |
5a4bf02f HH |
143 | * /run/initramfs/shutdown will take care of these. |
144 | * Also do not detach the old root, because /run/initramfs/shutdown needs to access it. | |
145 | */ | |
146 | return switch_root("/run/initramfs", "/oldroot", false, MS_BIND); | |
7cb1094a HH |
147 | } |
148 | ||
7cb1094a | 149 | |
b1b2a107 | 150 | int main(int argc, char *argv[]) { |
8c977838 | 151 | bool need_umount, need_swapoff, need_loop_detach, need_dm_detach; |
bd3fa1d2 | 152 | bool in_container, use_watchdog = false; |
06beed6d | 153 | _cleanup_free_ char *cgroup = NULL; |
6edd7d0a | 154 | char *arguments[3]; |
41f85451 LP |
155 | unsigned retries; |
156 | int cmd, r; | |
e801700e | 157 | static const char* const dirs[] = {SYSTEM_SHUTDOWN_PATH, NULL}; |
b1b2a107 | 158 | |
b1e90ec5 ZJS |
159 | log_parse_environment(); |
160 | r = parse_argv(argc, argv); | |
161 | if (r < 0) | |
162 | goto error; | |
ec26be51 | 163 | |
b1e90ec5 | 164 | /* journald will die if not gone yet. The log target defaults |
3f85ef0f | 165 | * to console, but may have been changed by command line options. */ |
ec26be51 | 166 | |
99f09825 | 167 | log_close_console(); /* force reopen of /dev/console */ |
b1b2a107 FF |
168 | log_open(); |
169 | ||
4c12626c LP |
170 | umask(0022); |
171 | ||
b1b2a107 | 172 | if (getpid() != 1) { |
b1e90ec5 | 173 | log_error("Not executed by init (PID 1)."); |
b1b2a107 FF |
174 | r = -EPERM; |
175 | goto error; | |
176 | } | |
177 | ||
b1e90ec5 | 178 | if (streq(arg_verb, "reboot")) |
b1b2a107 | 179 | cmd = RB_AUTOBOOT; |
b1e90ec5 | 180 | else if (streq(arg_verb, "poweroff")) |
b1b2a107 | 181 | cmd = RB_POWER_OFF; |
b1e90ec5 | 182 | else if (streq(arg_verb, "halt")) |
b1b2a107 | 183 | cmd = RB_HALT_SYSTEM; |
b1e90ec5 | 184 | else if (streq(arg_verb, "kexec")) |
b1b2a107 FF |
185 | cmd = LINUX_REBOOT_CMD_KEXEC; |
186 | else { | |
b1b2a107 | 187 | r = -EINVAL; |
b1e90ec5 | 188 | log_error("Unknown action '%s'.", arg_verb); |
b1b2a107 FF |
189 | goto error; |
190 | } | |
191 | ||
41f85451 LP |
192 | cg_get_root_path(&cgroup); |
193 | ||
e96d6be7 LP |
194 | use_watchdog = !!getenv("WATCHDOG_USEC"); |
195 | ||
b1b2a107 | 196 | /* lock us into memory */ |
b55d0651 | 197 | mlockall(MCL_CURRENT|MCL_FUTURE); |
b1b2a107 | 198 | |
ab58e291 | 199 | log_info("Sending SIGTERM to remaining processes..."); |
0bee65f0 | 200 | broadcast_signal(SIGTERM, true, true); |
b1b2a107 | 201 | |
ab58e291 | 202 | log_info("Sending SIGKILL to remaining processes..."); |
0bee65f0 | 203 | broadcast_signal(SIGKILL, true, false); |
40e85d00 | 204 | |
8c977838 ZJS |
205 | in_container = detect_container(NULL) > 0; |
206 | ||
d89b5fed | 207 | need_umount = !in_container; |
8c977838 ZJS |
208 | need_swapoff = !in_container; |
209 | need_loop_detach = !in_container; | |
210 | need_dm_detach = !in_container; | |
b1b2a107 | 211 | |
567ea02a | 212 | /* Unmount all mountpoints, swaps, and loopback devices */ |
12aad1d0 LP |
213 | for (retries = 0; retries < FINALIZE_ATTEMPTS; retries++) { |
214 | bool changed = false; | |
215 | ||
e96d6be7 LP |
216 | if (use_watchdog) |
217 | watchdog_ping(); | |
218 | ||
41f85451 LP |
219 | /* Let's trim the cgroup tree on each iteration so |
220 | that we leave an empty cgroup tree around, so that | |
221 | container managers get a nice notify event when we | |
222 | are down */ | |
223 | if (cgroup) | |
224 | cg_trim(SYSTEMD_CGROUP_CONTROLLER, cgroup, false); | |
225 | ||
b1b2a107 | 226 | if (need_umount) { |
ab58e291 | 227 | log_info("Unmounting file systems."); |
12aad1d0 | 228 | r = umount_all(&changed); |
bce93b7a | 229 | if (r == 0) { |
b1b2a107 | 230 | need_umount = false; |
bce93b7a MS |
231 | log_info("All filesystems unmounted."); |
232 | } else if (r > 0) | |
ab58e291 | 233 | log_info("Not all file systems unmounted, %d left.", r); |
b1b2a107 | 234 | else |
da927ba9 | 235 | log_error_errno(r, "Failed to unmount file systems: %m"); |
b1b2a107 FF |
236 | } |
237 | ||
238 | if (need_swapoff) { | |
735e0712 | 239 | log_info("Deactivating swaps."); |
12aad1d0 | 240 | r = swapoff_all(&changed); |
bce93b7a | 241 | if (r == 0) { |
b1b2a107 | 242 | need_swapoff = false; |
735e0712 | 243 | log_info("All swaps deactivated."); |
bce93b7a | 244 | } else if (r > 0) |
735e0712 | 245 | log_info("Not all swaps deactivated, %d left.", r); |
b1b2a107 | 246 | else |
da927ba9 | 247 | log_error_errno(r, "Failed to deactivate swaps: %m"); |
b1b2a107 FF |
248 | } |
249 | ||
250 | if (need_loop_detach) { | |
251 | log_info("Detaching loop devices."); | |
12aad1d0 | 252 | r = loopback_detach_all(&changed); |
bce93b7a | 253 | if (r == 0) { |
b1b2a107 | 254 | need_loop_detach = false; |
bce93b7a MS |
255 | log_info("All loop devices detached."); |
256 | } else if (r > 0) | |
ab58e291 | 257 | log_info("Not all loop devices detached, %d left.", r); |
b1b2a107 | 258 | else |
da927ba9 | 259 | log_error_errno(r, "Failed to detach loop devices: %m"); |
d48141ba | 260 | } |
b1b2a107 | 261 | |
d48141ba LP |
262 | if (need_dm_detach) { |
263 | log_info("Detaching DM devices."); | |
12aad1d0 | 264 | r = dm_detach_all(&changed); |
bce93b7a | 265 | if (r == 0) { |
d48141ba | 266 | need_dm_detach = false; |
bce93b7a MS |
267 | log_info("All DM devices detached."); |
268 | } else if (r > 0) | |
2569a5ce | 269 | log_info("Not all DM devices detached, %d left.", r); |
d48141ba | 270 | else |
da927ba9 | 271 | log_error_errno(r, "Failed to detach DM devices: %m"); |
b1b2a107 FF |
272 | } |
273 | ||
a27d2184 KS |
274 | if (!need_umount && !need_swapoff && !need_loop_detach && !need_dm_detach) { |
275 | if (retries > 0) | |
276 | log_info("All filesystems, swaps, loop devices, DM devices detached."); | |
12aad1d0 | 277 | /* Yay, done */ |
8c977838 | 278 | goto initrd_jump; |
a27d2184 | 279 | } |
b1b2a107 | 280 | |
12aad1d0 | 281 | /* If in this iteration we didn't manage to |
bd3fa1d2 | 282 | * unmount/deactivate anything, we simply give up */ |
12aad1d0 | 283 | if (!changed) { |
8c977838 ZJS |
284 | log_info("Cannot finalize remaining%s%s%s%s continuing.", |
285 | need_umount ? " file systems," : "", | |
286 | need_swapoff ? " swap devices," : "", | |
287 | need_loop_detach ? " loop devices," : "", | |
288 | need_dm_detach ? " DM devices," : ""); | |
289 | goto initrd_jump; | |
12aad1d0 LP |
290 | } |
291 | ||
8c977838 ZJS |
292 | log_debug("After %u retries, couldn't finalize remaining %s%s%s%s trying again.", |
293 | retries + 1, | |
294 | need_umount ? " file systems," : "", | |
295 | need_swapoff ? " swap devices," : "", | |
296 | need_loop_detach ? " loop devices," : "", | |
297 | need_dm_detach ? " DM devices," : ""); | |
b1b2a107 FF |
298 | } |
299 | ||
8c977838 ZJS |
300 | log_error("Too many iterations, giving up."); |
301 | ||
302 | initrd_jump: | |
12aad1d0 | 303 | |
6edd7d0a | 304 | arguments[0] = NULL; |
b1e90ec5 | 305 | arguments[1] = arg_verb; |
6edd7d0a | 306 | arguments[2] = NULL; |
e801700e | 307 | execute_directories(dirs, DEFAULT_TIMEOUT_USEC, arguments); |
83cc030f | 308 | |
02eaa788 | 309 | if (!in_container && !in_initrd() && |
cb7ec564 | 310 | access("/run/initramfs/shutdown", X_OK) == 0) { |
5a4bf02f HH |
311 | r = switch_root_initramfs(); |
312 | if (r >= 0) { | |
a2726e5c | 313 | argv[0] = (char*) "/shutdown"; |
30d743f4 | 314 | |
5a4bf02f HH |
315 | setsid(); |
316 | make_console_stdio(); | |
317 | ||
318 | log_info("Successfully changed into root pivot.\n" | |
319 | "Returning to initrd..."); | |
30d743f4 | 320 | |
a2726e5c | 321 | execv("/shutdown", argv); |
56f64d95 | 322 | log_error_errno(errno, "Failed to execute shutdown binary: %m"); |
5a4bf02f | 323 | } else |
da927ba9 | 324 | log_error_errno(r, "Failed to switch root to \"/run/initramfs\": %m"); |
5a4bf02f | 325 | |
7cb1094a HH |
326 | } |
327 | ||
8c977838 ZJS |
328 | if (need_umount || need_swapoff || need_loop_detach || need_dm_detach) |
329 | log_error("Failed to finalize %s%s%s%s ignoring", | |
330 | need_umount ? " file systems," : "", | |
331 | need_swapoff ? " swap devices," : "", | |
332 | need_loop_detach ? " loop devices," : "", | |
333 | need_dm_detach ? " DM devices," : ""); | |
334 | ||
0049f05a LP |
335 | /* The kernel will automaticall flush ATA disks and suchlike |
336 | * on reboot(), but the file systems need to be synce'd | |
337 | * explicitly in advance. So let's do this here, but not | |
338 | * needlessly slow down containers. */ | |
339 | if (!in_container) | |
340 | sync(); | |
341 | ||
477def80 LP |
342 | switch (cmd) { |
343 | ||
344 | case LINUX_REBOOT_CMD_KEXEC: | |
cb7ec564 LP |
345 | |
346 | if (!in_container) { | |
347 | /* We cheat and exec kexec to avoid doing all its work */ | |
477def80 LP |
348 | pid_t pid; |
349 | ||
350 | log_info("Rebooting with kexec."); | |
cb7ec564 | 351 | |
477def80 | 352 | pid = fork(); |
cb7ec564 | 353 | if (pid < 0) |
56f64d95 | 354 | log_error_errno(errno, "Failed to fork: %m"); |
477def80 LP |
355 | else if (pid == 0) { |
356 | ||
357 | const char * const args[] = { | |
358 | KEXEC, "-e", NULL | |
359 | }; | |
360 | ||
cb7ec564 | 361 | /* Child */ |
477def80 | 362 | |
cb7ec564 | 363 | execv(args[0], (char * const *) args); |
477def80 LP |
364 | _exit(EXIT_FAILURE); |
365 | } else | |
820d3acf | 366 | wait_for_terminate_and_warn("kexec", pid, true); |
b1b2a107 | 367 | } |
e61cd186 LP |
368 | |
369 | cmd = RB_AUTOBOOT; | |
477def80 | 370 | /* Fall through */ |
b1b2a107 | 371 | |
477def80 LP |
372 | case RB_AUTOBOOT: |
373 | ||
374 | if (!in_container) { | |
375 | _cleanup_free_ char *param = NULL; | |
376 | ||
377 | if (read_one_line_file(REBOOT_PARAM_FILE, ¶m) >= 0) { | |
378 | log_info("Rebooting with argument '%s'.", param); | |
f07756bf | 379 | syscall(SYS_reboot, LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_RESTART2, param); |
477def80 LP |
380 | } |
381 | } | |
382 | ||
383 | log_info("Rebooting."); | |
384 | break; | |
385 | ||
386 | case RB_POWER_OFF: | |
387 | log_info("Powering off."); | |
388 | break; | |
389 | ||
390 | case RB_HALT_SYSTEM: | |
391 | log_info("Halting system."); | |
392 | break; | |
393 | ||
394 | default: | |
395 | assert_not_reached("Unknown magic"); | |
396 | } | |
cb7ec564 | 397 | |
477def80 | 398 | reboot(cmd); |
cb7ec564 LP |
399 | if (errno == EPERM && in_container) { |
400 | /* If we are in a container, and we lacked | |
401 | * CAP_SYS_BOOT just exit, this will kill our | |
402 | * container for good. */ | |
477def80 | 403 | log_info("Exiting container."); |
cb7ec564 LP |
404 | exit(0); |
405 | } | |
406 | ||
56f64d95 | 407 | log_error_errno(errno, "Failed to invoke reboot(): %m"); |
e61cd186 | 408 | r = -errno; |
b1b2a107 FF |
409 | |
410 | error: | |
da927ba9 | 411 | log_emergency_errno(r, "Critical error while doing system shutdown: %m"); |
e61cd186 | 412 | |
b1b2a107 | 413 | freeze(); |
b1b2a107 | 414 | } |