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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 | ||
22 | #include <sys/mman.h> | |
23 | #include <sys/types.h> | |
24 | #include <sys/reboot.h> | |
25 | #include <linux/reboot.h> | |
26 | #include <sys/wait.h> | |
7cb1094a HH |
27 | #include <sys/types.h> |
28 | #include <sys/stat.h> | |
29 | #include <sys/mount.h> | |
30 | #include <sys/syscall.h> | |
31 | #include <fcntl.h> | |
b1b2a107 FF |
32 | #include <dirent.h> |
33 | #include <errno.h> | |
34 | #include <unistd.h> | |
35 | #include <signal.h> | |
36 | #include <stdbool.h> | |
37 | #include <stdlib.h> | |
38 | #include <string.h> | |
39 | ||
7cb1094a | 40 | #include "missing.h" |
b1b2a107 FF |
41 | #include "log.h" |
42 | #include "umount.h" | |
43 | #include "util.h" | |
49e942b2 | 44 | #include "mkdir.h" |
b52aae1d | 45 | #include "virt.h" |
e96d6be7 | 46 | #include "watchdog.h" |
39d6464c | 47 | #include "killall.h" |
b1b2a107 | 48 | |
b1b2a107 | 49 | #define FINALIZE_ATTEMPTS 50 |
b1b2a107 | 50 | |
89d471d5 LP |
51 | static int prepare_new_root(void) { |
52 | static const char dirs[] = | |
53 | "/run/initramfs/oldroot\0" | |
54 | "/run/initramfs/proc\0" | |
55 | "/run/initramfs/sys\0" | |
56 | "/run/initramfs/dev\0" | |
57 | "/run/initramfs/run\0"; | |
58 | ||
59 | const char *dir; | |
60 | ||
61 | if (mount("/run/initramfs", "/run/initramfs", NULL, MS_BIND, NULL) < 0) { | |
62 | log_error("Failed to mount bind /run/initramfs on /run/initramfs: %m"); | |
63 | return -errno; | |
64 | } | |
65 | ||
66 | if (mount(NULL, "/run/initramfs", NULL, MS_PRIVATE, NULL) < 0) { | |
67 | log_error("Failed to make /run/initramfs private mount: %m"); | |
68 | return -errno; | |
69 | } | |
70 | ||
71 | NULSTR_FOREACH(dir, dirs) | |
d2e54fae | 72 | if (mkdir_p_label(dir, 0755) < 0 && errno != EEXIST) { |
89d471d5 LP |
73 | log_error("Failed to mkdir %s: %m", dir); |
74 | return -errno; | |
7cb1094a | 75 | } |
89d471d5 LP |
76 | |
77 | if (mount("/sys", "/run/initramfs/sys", NULL, MS_BIND, NULL) < 0) { | |
78 | log_error("Failed to mount bind /sys on /run/initramfs/sys: %m"); | |
79 | return -errno; | |
80 | } | |
81 | ||
82 | if (mount("/proc", "/run/initramfs/proc", NULL, MS_BIND, NULL) < 0) { | |
83 | log_error("Failed to mount bind /proc on /run/initramfs/proc: %m"); | |
84 | return -errno; | |
85 | } | |
86 | ||
87 | if (mount("/dev", "/run/initramfs/dev", NULL, MS_BIND, NULL) < 0) { | |
88 | log_error("Failed to mount bind /dev on /run/initramfs/dev: %m"); | |
89 | return -errno; | |
7cb1094a HH |
90 | } |
91 | ||
89d471d5 LP |
92 | if (mount("/run", "/run/initramfs/run", NULL, MS_BIND, NULL) < 0) { |
93 | log_error("Failed to mount bind /run on /run/initramfs/run: %m"); | |
94 | return -errno; | |
95 | } | |
96 | ||
97 | return 0; | |
7cb1094a HH |
98 | } |
99 | ||
89d471d5 | 100 | static int pivot_to_new_root(void) { |
bd3fa1d2 | 101 | |
cd3bd60a LP |
102 | if (chdir("/run/initramfs") < 0) { |
103 | log_error("Failed to change directory to /run/initramfs: %m"); | |
104 | return -errno; | |
105 | } | |
7cb1094a HH |
106 | |
107 | /* | |
108 | In case some evil process made "/" MS_SHARED | |
109 | It works for pivot_root, but the ref count for the root device | |
110 | is not decreasing :-/ | |
111 | */ | |
89d471d5 LP |
112 | if (mount(NULL, "/", NULL, MS_PRIVATE, NULL) < 0) { |
113 | log_error("Failed to make \"/\" private mount %m"); | |
114 | return -errno; | |
7cb1094a HH |
115 | } |
116 | ||
89d471d5 | 117 | if (pivot_root(".", "oldroot") < 0) { |
7cb1094a | 118 | log_error("pivot failed: %m"); |
49f43d5f | 119 | /* only chroot if pivot root succeeded */ |
89d471d5 | 120 | return -errno; |
7cb1094a | 121 | } |
89d471d5 | 122 | |
7cb1094a | 123 | chroot("."); |
89d471d5 | 124 | |
cd3bd60a LP |
125 | setsid(); |
126 | make_console_stdio(); | |
bccc1d88 | 127 | |
cd3bd60a | 128 | log_info("Successfully changed into root pivot."); |
89d471d5 LP |
129 | |
130 | return 0; | |
7cb1094a HH |
131 | } |
132 | ||
b1b2a107 | 133 | int main(int argc, char *argv[]) { |
12aad1d0 LP |
134 | int cmd, r; |
135 | unsigned retries; | |
d48141ba | 136 | bool need_umount = true, need_swapoff = true, need_loop_detach = true, need_dm_detach = true; |
bd3fa1d2 | 137 | bool in_container, use_watchdog = false; |
6edd7d0a | 138 | char *arguments[3]; |
b1b2a107 FF |
139 | |
140 | log_parse_environment(); | |
2ca1b422 | 141 | log_set_target(LOG_TARGET_CONSOLE); /* syslog will die if not gone yet */ |
b1b2a107 FF |
142 | log_open(); |
143 | ||
4c12626c LP |
144 | umask(0022); |
145 | ||
b1b2a107 | 146 | if (getpid() != 1) { |
567ea02a | 147 | log_error("Not executed by init (pid 1)."); |
b1b2a107 FF |
148 | r = -EPERM; |
149 | goto error; | |
150 | } | |
151 | ||
152 | if (argc != 2) { | |
153 | log_error("Invalid number of arguments."); | |
154 | r = -EINVAL; | |
155 | goto error; | |
156 | } | |
157 | ||
40e85d00 LP |
158 | in_container = detect_container(NULL) > 0; |
159 | ||
b1b2a107 FF |
160 | if (streq(argv[1], "reboot")) |
161 | cmd = RB_AUTOBOOT; | |
162 | else if (streq(argv[1], "poweroff")) | |
163 | cmd = RB_POWER_OFF; | |
164 | else if (streq(argv[1], "halt")) | |
165 | cmd = RB_HALT_SYSTEM; | |
166 | else if (streq(argv[1], "kexec")) | |
167 | cmd = LINUX_REBOOT_CMD_KEXEC; | |
168 | else { | |
169 | log_error("Unknown action '%s'.", argv[1]); | |
170 | r = -EINVAL; | |
171 | goto error; | |
172 | } | |
173 | ||
e96d6be7 LP |
174 | use_watchdog = !!getenv("WATCHDOG_USEC"); |
175 | ||
b1b2a107 | 176 | /* lock us into memory */ |
b55d0651 | 177 | mlockall(MCL_CURRENT|MCL_FUTURE); |
b1b2a107 | 178 | |
ab58e291 | 179 | log_info("Sending SIGTERM to remaining processes..."); |
bd3fa1d2 | 180 | broadcast_signal(SIGTERM); |
b1b2a107 | 181 | |
ab58e291 | 182 | log_info("Sending SIGKILL to remaining processes..."); |
bd3fa1d2 | 183 | broadcast_signal(SIGKILL); |
40e85d00 | 184 | |
ff644623 | 185 | if (in_container) { |
40e85d00 | 186 | need_swapoff = false; |
ff644623 | 187 | need_dm_detach = false; |
910212e7 | 188 | need_loop_detach = false; |
ff644623 | 189 | } |
b1b2a107 | 190 | |
567ea02a | 191 | /* Unmount all mountpoints, swaps, and loopback devices */ |
12aad1d0 LP |
192 | for (retries = 0; retries < FINALIZE_ATTEMPTS; retries++) { |
193 | bool changed = false; | |
194 | ||
e96d6be7 LP |
195 | if (use_watchdog) |
196 | watchdog_ping(); | |
197 | ||
b1b2a107 | 198 | if (need_umount) { |
ab58e291 | 199 | log_info("Unmounting file systems."); |
12aad1d0 | 200 | r = umount_all(&changed); |
b1b2a107 FF |
201 | if (r == 0) |
202 | need_umount = false; | |
203 | else if (r > 0) | |
ab58e291 | 204 | log_info("Not all file systems unmounted, %d left.", r); |
b1b2a107 | 205 | else |
ab58e291 | 206 | log_error("Failed to unmount file systems: %s", strerror(-r)); |
b1b2a107 FF |
207 | } |
208 | ||
209 | if (need_swapoff) { | |
210 | log_info("Disabling swaps."); | |
12aad1d0 | 211 | r = swapoff_all(&changed); |
b1b2a107 FF |
212 | if (r == 0) |
213 | need_swapoff = false; | |
214 | else if (r > 0) | |
ab58e291 | 215 | log_info("Not all swaps are turned off, %d left.", r); |
b1b2a107 | 216 | else |
ab58e291 | 217 | log_error("Failed to turn off swaps: %s", strerror(-r)); |
b1b2a107 FF |
218 | } |
219 | ||
220 | if (need_loop_detach) { | |
221 | log_info("Detaching loop devices."); | |
12aad1d0 | 222 | r = loopback_detach_all(&changed); |
b1b2a107 FF |
223 | if (r == 0) |
224 | need_loop_detach = false; | |
225 | else if (r > 0) | |
ab58e291 | 226 | log_info("Not all loop devices detached, %d left.", r); |
b1b2a107 | 227 | else |
ab58e291 | 228 | log_error("Failed to detach loop devices: %s", strerror(-r)); |
d48141ba | 229 | } |
b1b2a107 | 230 | |
d48141ba LP |
231 | if (need_dm_detach) { |
232 | log_info("Detaching DM devices."); | |
12aad1d0 | 233 | r = dm_detach_all(&changed); |
d48141ba LP |
234 | if (r == 0) |
235 | need_dm_detach = false; | |
236 | else if (r > 0) | |
ab58e291 | 237 | log_warning("Not all DM devices detached, %d left.", r); |
d48141ba | 238 | else |
ab58e291 | 239 | log_error("Failed to detach DM devices: %s", strerror(-r)); |
b1b2a107 FF |
240 | } |
241 | ||
a27d2184 KS |
242 | if (!need_umount && !need_swapoff && !need_loop_detach && !need_dm_detach) { |
243 | if (retries > 0) | |
244 | log_info("All filesystems, swaps, loop devices, DM devices detached."); | |
12aad1d0 LP |
245 | /* Yay, done */ |
246 | break; | |
a27d2184 | 247 | } |
b1b2a107 | 248 | |
12aad1d0 | 249 | /* If in this iteration we didn't manage to |
bd3fa1d2 | 250 | * unmount/deactivate anything, we simply give up */ |
12aad1d0 | 251 | if (!changed) { |
bd3fa1d2 LP |
252 | log_error("Cannot finalize remaining file systems and devices, giving up."); |
253 | break; | |
12aad1d0 LP |
254 | } |
255 | ||
ab58e291 | 256 | log_debug("Couldn't finalize remaining file systems and devices after %u retries, trying again.", retries+1); |
b1b2a107 FF |
257 | } |
258 | ||
12aad1d0 | 259 | if (retries >= FINALIZE_ATTEMPTS) |
35b8ca3a | 260 | log_error("Too many iterations, giving up."); |
12aad1d0 | 261 | |
6edd7d0a LP |
262 | arguments[0] = NULL; |
263 | arguments[1] = argv[1]; | |
264 | arguments[2] = NULL; | |
265 | execute_directory(SYSTEM_SHUTDOWN_PATH, NULL, arguments); | |
83cc030f | 266 | |
40e85d00 LP |
267 | /* If we are in a container, just exit, this will kill our |
268 | * container for good. */ | |
f41de959 LP |
269 | if (in_container) { |
270 | log_error("Exiting container."); | |
40e85d00 | 271 | exit(0); |
f41de959 | 272 | } |
40e85d00 | 273 | |
7cb1094a | 274 | if (access("/run/initramfs/shutdown", X_OK) == 0) { |
89d471d5 LP |
275 | |
276 | if (prepare_new_root() >= 0 && | |
277 | pivot_to_new_root() >= 0) { | |
278 | execv("/shutdown", argv); | |
7cb1094a HH |
279 | log_error("Failed to execute shutdown binary: %m"); |
280 | } | |
281 | } | |
282 | ||
89d471d5 LP |
283 | sync(); |
284 | ||
b1b2a107 | 285 | if (cmd == LINUX_REBOOT_CMD_KEXEC) { |
12aad1d0 | 286 | /* We cheat and exec kexec to avoid doing all its work */ |
b1b2a107 | 287 | pid_t pid = fork(); |
12aad1d0 | 288 | |
e61cd186 LP |
289 | if (pid < 0) |
290 | log_error("Could not fork: %m. Falling back to normal reboot."); | |
291 | else if (pid > 0) { | |
292 | wait_for_terminate_and_warn("kexec", pid); | |
293 | log_warning("kexec failed. Falling back to normal reboot."); | |
b1b2a107 | 294 | } else { |
e61cd186 | 295 | /* Child */ |
f8d0ceb4 | 296 | const char *args[3] = { "/sbin/kexec", "-e", NULL }; |
b1b2a107 FF |
297 | execv(args[0], (char * const *) args); |
298 | return EXIT_FAILURE; | |
299 | } | |
e61cd186 LP |
300 | |
301 | cmd = RB_AUTOBOOT; | |
b1b2a107 FF |
302 | } |
303 | ||
304 | reboot(cmd); | |
e61cd186 LP |
305 | log_error("Failed to invoke reboot(): %m"); |
306 | r = -errno; | |
b1b2a107 FF |
307 | |
308 | error: | |
e61cd186 LP |
309 | log_error("Critical error while doing system shutdown: %s", strerror(-r)); |
310 | ||
b1b2a107 | 311 | freeze(); |
3c14d26c | 312 | return EXIT_FAILURE; |
b1b2a107 | 313 | } |