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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ | |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | Copyright 2014 Holger Hans Peter Freyther | |
8 | ||
9 | systemd is free software; you can redistribute it and/or modify it | |
10 | under the terms of the GNU Lesser General Public License as published by | |
11 | the Free Software Foundation; either version 2.1 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | systemd is distributed in the hope that it will be useful, but | |
15 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | Lesser General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU Lesser General Public License | |
20 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
21 | ***/ | |
22 | ||
23 | #include <stdio.h> | |
24 | #include <stdbool.h> | |
25 | #include <errno.h> | |
26 | #include <unistd.h> | |
27 | #include <fcntl.h> | |
28 | #include <sys/file.h> | |
29 | #include <sys/stat.h> | |
30 | #include <sys/prctl.h> | |
31 | ||
32 | #include "sd-bus.h" | |
33 | #include "sd-device.h" | |
34 | ||
35 | #include "bus-common-errors.h" | |
36 | #include "bus-error.h" | |
37 | #include "bus-util.h" | |
38 | #include "device-util.h" | |
39 | #include "fd-util.h" | |
40 | #include "path-util.h" | |
41 | #include "process-util.h" | |
42 | #include "signal-util.h" | |
43 | #include "socket-util.h" | |
44 | #include "special.h" | |
45 | #include "util.h" | |
46 | ||
47 | /* exit codes as defined in fsck(8) */ | |
48 | enum { | |
49 | FSCK_SUCCESS = 0, | |
50 | FSCK_ERROR_CORRECTED = 1, | |
51 | FSCK_SYSTEM_SHOULD_REBOOT = 2, | |
52 | FSCK_ERRORS_LEFT_UNCORRECTED = 4, | |
53 | FSCK_OPERATIONAL_ERROR = 8, | |
54 | FSCK_USAGE_OR_SYNTAX_ERROR = 16, | |
55 | FSCK_USER_CANCELLED = 32, | |
56 | FSCK_SHARED_LIB_ERROR = 128, | |
57 | }; | |
58 | ||
59 | static bool arg_skip = false; | |
60 | static bool arg_force = false; | |
61 | static bool arg_show_progress = false; | |
62 | static const char *arg_repair = "-a"; | |
63 | ||
64 | static void start_target(const char *target, const char *mode) { | |
65 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
66 | _cleanup_bus_flush_close_unref_ sd_bus *bus = NULL; | |
67 | int r; | |
68 | ||
69 | assert(target); | |
70 | ||
71 | r = bus_connect_system_systemd(&bus); | |
72 | if (r < 0) { | |
73 | log_error_errno(r, "Failed to get D-Bus connection: %m"); | |
74 | return; | |
75 | } | |
76 | ||
77 | log_info("Running request %s/start/replace", target); | |
78 | ||
79 | /* Start these units only if we can replace base.target with it */ | |
80 | r = sd_bus_call_method(bus, | |
81 | "org.freedesktop.systemd1", | |
82 | "/org/freedesktop/systemd1", | |
83 | "org.freedesktop.systemd1.Manager", | |
84 | "StartUnitReplace", | |
85 | &error, | |
86 | NULL, | |
87 | "sss", "basic.target", target, mode); | |
88 | ||
89 | /* Don't print a warning if we aren't called during startup */ | |
90 | if (r < 0 && !sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_JOB)) | |
91 | log_error("Failed to start unit: %s", bus_error_message(&error, r)); | |
92 | } | |
93 | ||
94 | static int parse_proc_cmdline_item(const char *key, const char *value) { | |
95 | int r; | |
96 | ||
97 | assert(key); | |
98 | ||
99 | if (streq(key, "fsck.mode") && value) { | |
100 | ||
101 | if (streq(value, "auto")) | |
102 | arg_force = arg_skip = false; | |
103 | else if (streq(value, "force")) | |
104 | arg_force = true; | |
105 | else if (streq(value, "skip")) | |
106 | arg_skip = true; | |
107 | else | |
108 | log_warning("Invalid fsck.mode= parameter '%s'. Ignoring.", value); | |
109 | ||
110 | } else if (streq(key, "fsck.repair") && value) { | |
111 | ||
112 | if (streq(value, "preen")) | |
113 | arg_repair = "-a"; | |
114 | else { | |
115 | r = parse_boolean(value); | |
116 | if (r > 0) | |
117 | arg_repair = "-y"; | |
118 | else if (r == 0) | |
119 | arg_repair = "-n"; | |
120 | else | |
121 | log_warning("Invalid fsck.repair= parameter '%s'. Ignoring.", value); | |
122 | } | |
123 | } | |
124 | ||
125 | #ifdef HAVE_SYSV_COMPAT | |
126 | else if (streq(key, "fastboot") && !value) { | |
127 | log_warning("Please pass 'fsck.mode=skip' rather than 'fastboot' on the kernel command line."); | |
128 | arg_skip = true; | |
129 | ||
130 | } else if (streq(key, "forcefsck") && !value) { | |
131 | log_warning("Please pass 'fsck.mode=force' rather than 'forcefsck' on the kernel command line."); | |
132 | arg_force = true; | |
133 | } | |
134 | #endif | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | static void test_files(void) { | |
140 | ||
141 | #ifdef HAVE_SYSV_COMPAT | |
142 | if (access("/fastboot", F_OK) >= 0) { | |
143 | log_error("Please pass 'fsck.mode=skip' on the kernel command line rather than creating /fastboot on the root file system."); | |
144 | arg_skip = true; | |
145 | } | |
146 | ||
147 | if (access("/forcefsck", F_OK) >= 0) { | |
148 | log_error("Please pass 'fsck.mode=force' on the kernel command line rather than creating /forcefsck on the root file system."); | |
149 | arg_force = true; | |
150 | } | |
151 | #endif | |
152 | ||
153 | arg_show_progress = access("/run/systemd/show-status", F_OK) >= 0; | |
154 | } | |
155 | ||
156 | static double percent(int pass, unsigned long cur, unsigned long max) { | |
157 | /* Values stolen from e2fsck */ | |
158 | ||
159 | static const int pass_table[] = { | |
160 | 0, 70, 90, 92, 95, 100 | |
161 | }; | |
162 | ||
163 | if (pass <= 0) | |
164 | return 0.0; | |
165 | ||
166 | if ((unsigned) pass >= ELEMENTSOF(pass_table) || max == 0) | |
167 | return 100.0; | |
168 | ||
169 | return (double) pass_table[pass-1] + | |
170 | ((double) pass_table[pass] - (double) pass_table[pass-1]) * | |
171 | (double) cur / (double) max; | |
172 | } | |
173 | ||
174 | static int process_progress(int fd) { | |
175 | _cleanup_fclose_ FILE *console = NULL, *f = NULL; | |
176 | usec_t last = 0; | |
177 | bool locked = false; | |
178 | int clear = 0, r; | |
179 | ||
180 | /* No progress pipe to process? Then we are a NOP. */ | |
181 | if (fd < 0) | |
182 | return 0; | |
183 | ||
184 | f = fdopen(fd, "re"); | |
185 | if (!f) { | |
186 | safe_close(fd); | |
187 | return -errno; | |
188 | } | |
189 | ||
190 | console = fopen("/dev/console", "we"); | |
191 | if (!console) | |
192 | return -ENOMEM; | |
193 | ||
194 | for (;;) { | |
195 | int pass, m; | |
196 | unsigned long cur, max; | |
197 | _cleanup_free_ char *device = NULL; | |
198 | double p; | |
199 | usec_t t; | |
200 | ||
201 | if (fscanf(f, "%i %lu %lu %ms", &pass, &cur, &max, &device) != 4) { | |
202 | ||
203 | if (ferror(f)) | |
204 | r = log_warning_errno(errno, "Failed to read from progress pipe: %m"); | |
205 | else if (feof(f)) | |
206 | r = 0; | |
207 | else { | |
208 | log_warning("Failed to parse progress pipe data"); | |
209 | r = -EBADMSG; | |
210 | } | |
211 | break; | |
212 | } | |
213 | ||
214 | /* Only show one progress counter at max */ | |
215 | if (!locked) { | |
216 | if (flock(fileno(console), LOCK_EX|LOCK_NB) < 0) | |
217 | continue; | |
218 | ||
219 | locked = true; | |
220 | } | |
221 | ||
222 | /* Only update once every 50ms */ | |
223 | t = now(CLOCK_MONOTONIC); | |
224 | if (last + 50 * USEC_PER_MSEC > t) | |
225 | continue; | |
226 | ||
227 | last = t; | |
228 | ||
229 | p = percent(pass, cur, max); | |
230 | fprintf(console, "\r%s: fsck %3.1f%% complete...\r%n", device, p, &m); | |
231 | fflush(console); | |
232 | ||
233 | if (m > clear) | |
234 | clear = m; | |
235 | } | |
236 | ||
237 | if (clear > 0) { | |
238 | unsigned j; | |
239 | ||
240 | fputc('\r', console); | |
241 | for (j = 0; j < (unsigned) clear; j++) | |
242 | fputc(' ', console); | |
243 | fputc('\r', console); | |
244 | fflush(console); | |
245 | } | |
246 | ||
247 | return r; | |
248 | } | |
249 | ||
250 | static int fsck_progress_socket(void) { | |
251 | static const union sockaddr_union sa = { | |
252 | .un.sun_family = AF_UNIX, | |
253 | .un.sun_path = "/run/systemd/fsck.progress", | |
254 | }; | |
255 | ||
256 | int fd, r; | |
257 | ||
258 | fd = socket(AF_UNIX, SOCK_STREAM, 0); | |
259 | if (fd < 0) | |
260 | return log_warning_errno(errno, "socket(): %m"); | |
261 | ||
262 | if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) { | |
263 | r = log_full_errno(errno == ECONNREFUSED || errno == ENOENT ? LOG_DEBUG : LOG_WARNING, | |
264 | errno, "Failed to connect to progress socket %s, ignoring: %m", sa.un.sun_path); | |
265 | safe_close(fd); | |
266 | return r; | |
267 | } | |
268 | ||
269 | return fd; | |
270 | } | |
271 | ||
272 | int main(int argc, char *argv[]) { | |
273 | _cleanup_close_pair_ int progress_pipe[2] = { -1, -1 }; | |
274 | _cleanup_device_unref_ sd_device *dev = NULL; | |
275 | const char *device, *type; | |
276 | bool root_directory; | |
277 | siginfo_t status; | |
278 | struct stat st; | |
279 | int r; | |
280 | pid_t pid; | |
281 | ||
282 | if (argc > 2) { | |
283 | log_error("This program expects one or no arguments."); | |
284 | return EXIT_FAILURE; | |
285 | } | |
286 | ||
287 | log_set_target(LOG_TARGET_AUTO); | |
288 | log_parse_environment(); | |
289 | log_open(); | |
290 | ||
291 | umask(0022); | |
292 | ||
293 | r = parse_proc_cmdline(parse_proc_cmdline_item); | |
294 | if (r < 0) | |
295 | log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); | |
296 | ||
297 | test_files(); | |
298 | ||
299 | if (!arg_force && arg_skip) { | |
300 | r = 0; | |
301 | goto finish; | |
302 | } | |
303 | ||
304 | if (argc > 1) { | |
305 | device = argv[1]; | |
306 | ||
307 | if (stat(device, &st) < 0) { | |
308 | r = log_error_errno(errno, "Failed to stat %s: %m", device); | |
309 | goto finish; | |
310 | } | |
311 | ||
312 | if (!S_ISBLK(st.st_mode)) { | |
313 | log_error("%s is not a block device.", device); | |
314 | r = -EINVAL; | |
315 | goto finish; | |
316 | } | |
317 | ||
318 | r = sd_device_new_from_devnum(&dev, 'b', st.st_rdev); | |
319 | if (r < 0) { | |
320 | log_error_errno(r, "Failed to detect device %s: %m", device); | |
321 | goto finish; | |
322 | } | |
323 | ||
324 | root_directory = false; | |
325 | } else { | |
326 | struct timespec times[2]; | |
327 | ||
328 | /* Find root device */ | |
329 | ||
330 | if (stat("/", &st) < 0) { | |
331 | r = log_error_errno(errno, "Failed to stat() the root directory: %m"); | |
332 | goto finish; | |
333 | } | |
334 | ||
335 | /* Virtual root devices don't need an fsck */ | |
336 | if (major(st.st_dev) == 0) { | |
337 | log_debug("Root directory is virtual or btrfs, skipping check."); | |
338 | r = 0; | |
339 | goto finish; | |
340 | } | |
341 | ||
342 | /* check if we are already writable */ | |
343 | times[0] = st.st_atim; | |
344 | times[1] = st.st_mtim; | |
345 | ||
346 | if (utimensat(AT_FDCWD, "/", times, 0) == 0) { | |
347 | log_info("Root directory is writable, skipping check."); | |
348 | r = 0; | |
349 | goto finish; | |
350 | } | |
351 | ||
352 | r = sd_device_new_from_devnum(&dev, 'b', st.st_dev); | |
353 | if (r < 0) { | |
354 | log_error_errno(r, "Failed to detect root device: %m"); | |
355 | goto finish; | |
356 | } | |
357 | ||
358 | r = sd_device_get_devname(dev, &device); | |
359 | if (r < 0) { | |
360 | log_error_errno(r, "Failed to detect device node of root directory: %m"); | |
361 | goto finish; | |
362 | } | |
363 | ||
364 | root_directory = true; | |
365 | } | |
366 | ||
367 | r = sd_device_get_property_value(dev, "ID_FS_TYPE", &type); | |
368 | if (r >= 0) { | |
369 | r = fsck_exists(type); | |
370 | if (r < 0) | |
371 | log_warning_errno(r, "Couldn't detect if fsck.%s may be used for %s, proceeding: %m", type, device); | |
372 | else if (r == 0) { | |
373 | log_info("fsck.%s doesn't exist, not checking file system on %s.", type, device); | |
374 | goto finish; | |
375 | } | |
376 | } | |
377 | ||
378 | if (arg_show_progress) { | |
379 | if (pipe(progress_pipe) < 0) { | |
380 | r = log_error_errno(errno, "pipe(): %m"); | |
381 | goto finish; | |
382 | } | |
383 | } | |
384 | ||
385 | pid = fork(); | |
386 | if (pid < 0) { | |
387 | r = log_error_errno(errno, "fork(): %m"); | |
388 | goto finish; | |
389 | } | |
390 | if (pid == 0) { | |
391 | char dash_c[sizeof("-C")-1 + DECIMAL_STR_MAX(int) + 1]; | |
392 | int progress_socket = -1; | |
393 | const char *cmdline[9]; | |
394 | int i = 0; | |
395 | ||
396 | /* Child */ | |
397 | ||
398 | (void) reset_all_signal_handlers(); | |
399 | (void) reset_signal_mask(); | |
400 | assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0); | |
401 | ||
402 | /* Close the reading side of the progress pipe */ | |
403 | progress_pipe[0] = safe_close(progress_pipe[0]); | |
404 | ||
405 | /* Try to connect to a progress management daemon, if there is one */ | |
406 | progress_socket = fsck_progress_socket(); | |
407 | if (progress_socket >= 0) { | |
408 | /* If this worked we close the progress pipe early, and just use the socket */ | |
409 | progress_pipe[1] = safe_close(progress_pipe[1]); | |
410 | xsprintf(dash_c, "-C%i", progress_socket); | |
411 | } else if (progress_pipe[1] >= 0) { | |
412 | /* Otherwise if we have the progress pipe to our own local handle, we use it */ | |
413 | xsprintf(dash_c, "-C%i", progress_pipe[1]); | |
414 | } else | |
415 | dash_c[0] = 0; | |
416 | ||
417 | cmdline[i++] = "/sbin/fsck"; | |
418 | cmdline[i++] = arg_repair; | |
419 | cmdline[i++] = "-T"; | |
420 | ||
421 | /* | |
422 | * Since util-linux v2.25 fsck uses /run/fsck/<diskname>.lock files. | |
423 | * The previous versions use flock for the device and conflict with | |
424 | * udevd, see https://bugs.freedesktop.org/show_bug.cgi?id=79576#c5 | |
425 | */ | |
426 | cmdline[i++] = "-l"; | |
427 | ||
428 | if (!root_directory) | |
429 | cmdline[i++] = "-M"; | |
430 | ||
431 | if (arg_force) | |
432 | cmdline[i++] = "-f"; | |
433 | ||
434 | if (!isempty(dash_c)) | |
435 | cmdline[i++] = dash_c; | |
436 | ||
437 | cmdline[i++] = device; | |
438 | cmdline[i++] = NULL; | |
439 | ||
440 | execv(cmdline[0], (char**) cmdline); | |
441 | _exit(FSCK_OPERATIONAL_ERROR); | |
442 | } | |
443 | ||
444 | progress_pipe[1] = safe_close(progress_pipe[1]); | |
445 | (void) process_progress(progress_pipe[0]); | |
446 | progress_pipe[0] = -1; | |
447 | ||
448 | r = wait_for_terminate(pid, &status); | |
449 | if (r < 0) { | |
450 | log_error_errno(r, "waitid(): %m"); | |
451 | goto finish; | |
452 | } | |
453 | ||
454 | if (status.si_code != CLD_EXITED || (status.si_status & ~1)) { | |
455 | ||
456 | if (status.si_code == CLD_KILLED || status.si_code == CLD_DUMPED) | |
457 | log_error("fsck terminated by signal %s.", signal_to_string(status.si_status)); | |
458 | else if (status.si_code == CLD_EXITED) | |
459 | log_error("fsck failed with error code %i.", status.si_status); | |
460 | else | |
461 | log_error("fsck failed due to unknown reason."); | |
462 | ||
463 | r = -EINVAL; | |
464 | ||
465 | if (status.si_code == CLD_EXITED && (status.si_status & FSCK_SYSTEM_SHOULD_REBOOT) && root_directory) | |
466 | /* System should be rebooted. */ | |
467 | start_target(SPECIAL_REBOOT_TARGET, "replace-irreversibly"); | |
468 | else if (status.si_code == CLD_EXITED && (status.si_status & (FSCK_SYSTEM_SHOULD_REBOOT | FSCK_ERRORS_LEFT_UNCORRECTED))) | |
469 | /* Some other problem */ | |
470 | start_target(SPECIAL_EMERGENCY_TARGET, "replace"); | |
471 | else { | |
472 | log_warning("Ignoring error."); | |
473 | r = 0; | |
474 | } | |
475 | ||
476 | } else | |
477 | r = 0; | |
478 | ||
479 | if (status.si_code == CLD_EXITED && (status.si_status & FSCK_ERROR_CORRECTED)) | |
480 | (void) touch("/run/systemd/quotacheck"); | |
481 | ||
482 | finish: | |
483 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
484 | } |