chiark / gitweb /
virt: rework container detection logic
[elogind.git] / src / fsck / fsck.c
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 <string.h>
26 #include <errno.h>
27 #include <unistd.h>
28 #include <fcntl.h>
29 #include <sys/file.h>
30
31 #include "sd-bus.h"
32 #include "libudev.h"
33
34 #include "util.h"
35 #include "special.h"
36 #include "bus-util.h"
37 #include "bus-error.h"
38 #include "bus-errors.h"
39 #include "fileio.h"
40 #include "udev-util.h"
41 #include "path-util.h"
42
43 static bool arg_skip = false;
44 static bool arg_force = false;
45 static bool arg_show_progress = false;
46 static const char *arg_repair = "-a";
47
48 static void start_target(const char *target) {
49         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
50         _cleanup_bus_unref_ sd_bus *bus = NULL;
51         int r;
52
53         assert(target);
54
55         r = bus_open_system_systemd(&bus);
56         if (r < 0) {
57                 log_error("Failed to get D-Bus connection: %s", strerror(-r));
58                 return;
59         }
60
61         log_info("Running request %s/start/replace", target);
62
63         /* Start these units only if we can replace base.target with it */
64         r = sd_bus_call_method(bus,
65                                "org.freedesktop.systemd1",
66                                "/org/freedesktop/systemd1",
67                                "org.freedesktop.systemd1.Manager",
68                                "StartUnitReplace",
69                                &error,
70                                NULL,
71                                "sss", "basic.target", target, "replace");
72
73         /* Don't print a warning if we aren't called during startup */
74         if (r < 0 && !sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_JOB))
75                 log_error("Failed to start unit: %s", bus_error_message(&error, -r));
76 }
77
78 static int parse_proc_cmdline_item(const char *key, const char *value) {
79
80         if (streq(key, "fsck.mode") && value) {
81
82                 if (streq(value, "auto"))
83                         arg_force = arg_skip = false;
84                 else if (streq(value, "force"))
85                         arg_force = true;
86                 else if (streq(value, "skip"))
87                         arg_skip = true;
88                 else
89                         log_warning("Invalid fsck.mode= parameter. Ignoring.");
90         } else if (streq(key, "fsck.repair") && value) {
91
92                 if (streq(value, "preen"))
93                         arg_repair = "-a";
94                 else if (streq(value, "yes"))
95                         arg_repair = "-y";
96                 else if (streq(value, "no"))
97                         arg_repair = "-n";
98                 else
99                         log_warning("Invalid fsck.repair= parameter. Ignoring.");
100         } else if (startswith(key, "fsck."))
101                 log_warning("Invalid fsck parameter. Ignoring.");
102 #ifdef HAVE_SYSV_COMPAT
103         else if (streq(key, "fastboot") && !value) {
104                 log_warning("Please pass 'fsck.mode=skip' rather than 'fastboot' on the kernel command line.");
105                 arg_skip = true;
106         } else if (streq(key, "forcefsck") && !value) {
107                 log_warning("Please pass 'fsck.mode=force' rather than 'forcefsck' on the kernel command line.");
108                 arg_force = true;
109         }
110 #endif
111
112         return 0;
113 }
114
115 static void test_files(void) {
116 #ifdef HAVE_SYSV_COMPAT
117         if (access("/fastboot", F_OK) >= 0) {
118                 log_error("Please pass 'fsck.mode=skip' on the kernel command line rather than creating /fastboot on the root file system.");
119                 arg_skip = true;
120         }
121
122         if (access("/forcefsck", F_OK) >= 0) {
123                 log_error("Please pass 'fsck.mode=force' on the kernel command line rather than creating /forcefsck on the root file system.");
124                 arg_force = true;
125         }
126 #endif
127
128         if (access("/run/systemd/show-status", F_OK) >= 0 || plymouth_running())
129                 arg_show_progress = true;
130 }
131
132 static double percent(int pass, unsigned long cur, unsigned long max) {
133         /* Values stolen from e2fsck */
134
135         static const int pass_table[] = {
136                 0, 70, 90, 92, 95, 100
137         };
138
139         if (pass <= 0)
140                 return 0.0;
141
142         if ((unsigned) pass >= ELEMENTSOF(pass_table) || max == 0)
143                 return 100.0;
144
145         return (double) pass_table[pass-1] +
146                 ((double) pass_table[pass] - (double) pass_table[pass-1]) *
147                 (double) cur / (double) max;
148 }
149
150 static int process_progress(int fd) {
151         _cleanup_fclose_ FILE *console = NULL, *f = NULL;
152         usec_t last = 0;
153         bool locked = false;
154         int clear = 0;
155
156         f = fdopen(fd, "r");
157         if (!f) {
158                 safe_close(fd);
159                 return -errno;
160         }
161
162         console = fopen("/dev/console", "we");
163         if (!console)
164                 return -ENOMEM;
165
166         while (!feof(f)) {
167                 int pass, m;
168                 unsigned long cur, max;
169                 _cleanup_free_ char *device = NULL;
170                 double p;
171                 usec_t t;
172
173                 if (fscanf(f, "%i %lu %lu %ms", &pass, &cur, &max, &device) != 4)
174                         break;
175
176                 /* Only show one progress counter at max */
177                 if (!locked) {
178                         if (flock(fileno(console), LOCK_EX|LOCK_NB) < 0)
179                                 continue;
180
181                         locked = true;
182                 }
183
184                 /* Only update once every 50ms */
185                 t = now(CLOCK_MONOTONIC);
186                 if (last + 50 * USEC_PER_MSEC > t)
187                         continue;
188
189                 last = t;
190
191                 p = percent(pass, cur, max);
192                 fprintf(console, "\r%s: fsck %3.1f%% complete...\r%n", device, p, &m);
193                 fflush(console);
194
195                 if (m > clear)
196                         clear = m;
197         }
198
199         if (clear > 0) {
200                 unsigned j;
201
202                 fputc('\r', console);
203                 for (j = 0; j < (unsigned) clear; j++)
204                         fputc(' ', console);
205                 fputc('\r', console);
206                 fflush(console);
207         }
208
209         return 0;
210 }
211
212 int main(int argc, char *argv[]) {
213         const char *cmdline[9];
214         int i = 0, r = EXIT_FAILURE, q;
215         pid_t pid;
216         siginfo_t status;
217         _cleanup_udev_unref_ struct udev *udev = NULL;
218         _cleanup_udev_device_unref_ struct udev_device *udev_device = NULL;
219         const char *device, *type;
220         bool root_directory;
221         int progress_pipe[2] = { -1, -1 };
222         char dash_c[2+10+1];
223         struct stat st;
224
225         if (argc > 2) {
226                 log_error("This program expects one or no arguments.");
227                 return EXIT_FAILURE;
228         }
229
230         log_set_target(LOG_TARGET_AUTO);
231         log_parse_environment();
232         log_open();
233
234         umask(0022);
235
236         parse_proc_cmdline(parse_proc_cmdline_item);
237         test_files();
238
239         if (!arg_force && arg_skip)
240                 return 0;
241
242         udev = udev_new();
243         if (!udev) {
244                 log_oom();
245                 return EXIT_FAILURE;
246         }
247
248         if (argc > 1) {
249                 device = argv[1];
250                 root_directory = false;
251
252                 if (stat(device, &st) < 0) {
253                         log_error("Failed to stat '%s': %m", device);
254                         return EXIT_FAILURE;
255                 }
256
257                 udev_device = udev_device_new_from_devnum(udev, 'b', st.st_rdev);
258                 if (!udev_device) {
259                         log_error("Failed to detect device %s", device);
260                         return EXIT_FAILURE;
261                 }
262         } else {
263                 struct timespec times[2];
264
265                 /* Find root device */
266
267                 if (stat("/", &st) < 0) {
268                         log_error("Failed to stat() the root directory: %m");
269                         return EXIT_FAILURE;
270                 }
271
272                 /* Virtual root devices don't need an fsck */
273                 if (major(st.st_dev) == 0)
274                         return EXIT_SUCCESS;
275
276                 /* check if we are already writable */
277                 times[0] = st.st_atim;
278                 times[1] = st.st_mtim;
279                 if (utimensat(AT_FDCWD, "/", times, 0) == 0) {
280                         log_info("Root directory is writable, skipping check.");
281                         return EXIT_SUCCESS;
282                 }
283
284                 udev_device = udev_device_new_from_devnum(udev, 'b', st.st_dev);
285                 if (!udev_device) {
286                         log_error("Failed to detect root device.");
287                         return EXIT_FAILURE;
288                 }
289
290                 device = udev_device_get_devnode(udev_device);
291                 if (!device) {
292                         log_error("Failed to detect device node of root directory.");
293                         return EXIT_FAILURE;
294                 }
295
296                 root_directory = true;
297         }
298
299         type = udev_device_get_property_value(udev_device, "ID_FS_TYPE");
300         if (type) {
301                 r = fsck_exists(type);
302                 if (r < 0) {
303                         if (r == -ENOENT) {
304                                 log_info("fsck.%s doesn't exist, not checking file system.", type);
305                                 return EXIT_SUCCESS;
306                         } else
307                                 log_warning("fsck.%s cannot be used: %s", type, strerror(-r));
308                 }
309         }
310
311         if (arg_show_progress)
312                 if (pipe(progress_pipe) < 0) {
313                         log_error("pipe(): %m");
314                         return EXIT_FAILURE;
315                 }
316
317         cmdline[i++] = "/sbin/fsck";
318         cmdline[i++] =  arg_repair;
319         cmdline[i++] = "-T";
320         cmdline[i++] = "-l";
321
322         if (!root_directory)
323                 cmdline[i++] = "-M";
324
325         if (arg_force)
326                 cmdline[i++] = "-f";
327
328         if (progress_pipe[1] >= 0) {
329                 snprintf(dash_c, sizeof(dash_c), "-C%i", progress_pipe[1]);
330                 char_array_0(dash_c);
331                 cmdline[i++] = dash_c;
332         }
333
334         cmdline[i++] = device;
335         cmdline[i++] = NULL;
336
337         pid = fork();
338         if (pid < 0) {
339                 log_error("fork(): %m");
340                 goto finish;
341         } else if (pid == 0) {
342                 /* Child */
343                 if (progress_pipe[0] >= 0)
344                         safe_close(progress_pipe[0]);
345                 execv(cmdline[0], (char**) cmdline);
346                 _exit(8); /* Operational error */
347         }
348
349         progress_pipe[1] = safe_close(progress_pipe[1]);
350
351         if (progress_pipe[0] >= 0) {
352                 process_progress(progress_pipe[0]);
353                 progress_pipe[0] = -1;
354         }
355
356         q = wait_for_terminate(pid, &status);
357         if (q < 0) {
358                 log_error("waitid(): %s", strerror(-q));
359                 goto finish;
360         }
361
362         if (status.si_code != CLD_EXITED || (status.si_status & ~1)) {
363
364                 if (status.si_code == CLD_KILLED || status.si_code == CLD_DUMPED)
365                         log_error("fsck terminated by signal %s.", signal_to_string(status.si_status));
366                 else if (status.si_code == CLD_EXITED)
367                         log_error("fsck failed with error code %i.", status.si_status);
368                 else
369                         log_error("fsck failed due to unknown reason.");
370
371                 if (status.si_code == CLD_EXITED && (status.si_status & 2) && root_directory)
372                         /* System should be rebooted. */
373                         start_target(SPECIAL_REBOOT_TARGET);
374                 else if (status.si_code == CLD_EXITED && (status.si_status & 6))
375                         /* Some other problem */
376                         start_target(SPECIAL_EMERGENCY_TARGET);
377                 else {
378                         r = EXIT_SUCCESS;
379                         log_warning("Ignoring error.");
380                 }
381
382         } else
383                 r = EXIT_SUCCESS;
384
385         if (status.si_code == CLD_EXITED && (status.si_status & 1))
386                 touch("/run/systemd/quotacheck");
387
388 finish:
389         safe_close_pair(progress_pipe);
390
391         return r;
392 }