/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
Copyright 2014 Holger Hans Peter Freyther
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/file.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <unistd.h>
#include "sd-bus.h"
#include "sd-device.h"
#include "alloc-util.h"
#include "bus-common-errors.h"
#include "bus-error.h"
#include "bus-util.h"
#include "device-util.h"
#include "fd-util.h"
#include "fs-util.h"
#include "parse-util.h"
#include "path-util.h"
#include "proc-cmdline.h"
#include "process-util.h"
#include "signal-util.h"
#include "socket-util.h"
#include "special.h"
#include "stdio-util.h"
#include "util.h"
/* exit codes as defined in fsck(8) */
enum {
FSCK_SUCCESS = 0,
FSCK_ERROR_CORRECTED = 1,
FSCK_SYSTEM_SHOULD_REBOOT = 2,
FSCK_ERRORS_LEFT_UNCORRECTED = 4,
FSCK_OPERATIONAL_ERROR = 8,
FSCK_USAGE_OR_SYNTAX_ERROR = 16,
FSCK_USER_CANCELLED = 32,
FSCK_SHARED_LIB_ERROR = 128,
};
static bool arg_skip = false;
static bool arg_force = false;
static bool arg_show_progress = false;
static const char *arg_repair = "-a";
static void start_target(const char *target, const char *mode) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
int r;
assert(target);
r = bus_connect_system_systemd(&bus);
if (r < 0) {
log_error_errno(r, "Failed to get D-Bus connection: %m");
return;
}
log_info("Running request %s/start/replace", target);
/* Start these units only if we can replace base.target with it */
r = sd_bus_call_method(bus,
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"StartUnitReplace",
&error,
NULL,
"sss", "basic.target", target, mode);
/* Don't print a warning if we aren't called during startup */
if (r < 0 && !sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_JOB))
log_error("Failed to start unit: %s", bus_error_message(&error, r));
}
static int parse_proc_cmdline_item(const char *key, const char *value) {
int r;
assert(key);
if (streq(key, "fsck.mode") && value) {
if (streq(value, "auto"))
arg_force = arg_skip = false;
else if (streq(value, "force"))
arg_force = true;
else if (streq(value, "skip"))
arg_skip = true;
else
log_warning("Invalid fsck.mode= parameter '%s'. Ignoring.", value);
} else if (streq(key, "fsck.repair") && value) {
if (streq(value, "preen"))
arg_repair = "-a";
else {
r = parse_boolean(value);
if (r > 0)
arg_repair = "-y";
else if (r == 0)
arg_repair = "-n";
else
log_warning("Invalid fsck.repair= parameter '%s'. Ignoring.", value);
}
}
#ifdef HAVE_SYSV_COMPAT
else if (streq(key, "fastboot") && !value) {
log_warning("Please pass 'fsck.mode=skip' rather than 'fastboot' on the kernel command line.");
arg_skip = true;
} else if (streq(key, "forcefsck") && !value) {
log_warning("Please pass 'fsck.mode=force' rather than 'forcefsck' on the kernel command line.");
arg_force = true;
}
#endif
return 0;
}
static void test_files(void) {
#ifdef HAVE_SYSV_COMPAT
if (access("/fastboot", F_OK) >= 0) {
log_error("Please pass 'fsck.mode=skip' on the kernel command line rather than creating /fastboot on the root file system.");
arg_skip = true;
}
if (access("/forcefsck", F_OK) >= 0) {
log_error("Please pass 'fsck.mode=force' on the kernel command line rather than creating /forcefsck on the root file system.");
arg_force = true;
}
#endif
arg_show_progress = access("/run/systemd/show-status", F_OK) >= 0;
}
static double percent(int pass, unsigned long cur, unsigned long max) {
/* Values stolen from e2fsck */
static const int pass_table[] = {
0, 70, 90, 92, 95, 100
};
if (pass <= 0)
return 0.0;
if ((unsigned) pass >= ELEMENTSOF(pass_table) || max == 0)
return 100.0;
return (double) pass_table[pass-1] +
((double) pass_table[pass] - (double) pass_table[pass-1]) *
(double) cur / (double) max;
}
static int process_progress(int fd) {
_cleanup_fclose_ FILE *console = NULL, *f = NULL;
usec_t last = 0;
bool locked = false;
int clear = 0, r;
/* No progress pipe to process? Then we are a NOP. */
if (fd < 0)
return 0;
f = fdopen(fd, "re");
if (!f) {
safe_close(fd);
return -errno;
}
console = fopen("/dev/console", "we");
if (!console)
return -ENOMEM;
for (;;) {
int pass, m;
unsigned long cur, max;
_cleanup_free_ char *device = NULL;
double p;
usec_t t;
if (fscanf(f, "%i %lu %lu %ms", &pass, &cur, &max, &device) != 4) {
if (ferror(f))
r = log_warning_errno(errno, "Failed to read from progress pipe: %m");
else if (feof(f))
r = 0;
else {
log_warning("Failed to parse progress pipe data");
r = -EBADMSG;
}
break;
}
/* Only show one progress counter at max */
if (!locked) {
if (flock(fileno(console), LOCK_EX|LOCK_NB) < 0)
continue;
locked = true;
}
/* Only update once every 50ms */
t = now(CLOCK_MONOTONIC);
if (last + 50 * USEC_PER_MSEC > t)
continue;
last = t;
p = percent(pass, cur, max);
fprintf(console, "\r%s: fsck %3.1f%% complete...\r%n", device, p, &m);
fflush(console);
if (m > clear)
clear = m;
}
if (clear > 0) {
unsigned j;
fputc('\r', console);
for (j = 0; j < (unsigned) clear; j++)
fputc(' ', console);
fputc('\r', console);
fflush(console);
}
return r;
}
static int fsck_progress_socket(void) {
static const union sockaddr_union sa = {
.un.sun_family = AF_UNIX,
.un.sun_path = "/run/systemd/fsck.progress",
};
int fd, r;
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
return log_warning_errno(errno, "socket(): %m");
if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
r = log_full_errno(errno == ECONNREFUSED || errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
errno, "Failed to connect to progress socket %s, ignoring: %m", sa.un.sun_path);
safe_close(fd);
return r;
}
return fd;
}
int main(int argc, char *argv[]) {
_cleanup_close_pair_ int progress_pipe[2] = { -1, -1 };
_cleanup_(sd_device_unrefp) sd_device *dev = NULL;
const char *device, *type;
bool root_directory;
siginfo_t status;
struct stat st;
int r;
pid_t pid;
if (argc > 2) {
log_error("This program expects one or no arguments.");
return EXIT_FAILURE;
}
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
umask(0022);
r = parse_proc_cmdline(parse_proc_cmdline_item);
if (r < 0)
log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
test_files();
if (!arg_force && arg_skip) {
r = 0;
goto finish;
}
if (argc > 1) {
device = argv[1];
if (stat(device, &st) < 0) {
r = log_error_errno(errno, "Failed to stat %s: %m", device);
goto finish;
}
if (!S_ISBLK(st.st_mode)) {
log_error("%s is not a block device.", device);
r = -EINVAL;
goto finish;
}
r = sd_device_new_from_devnum(&dev, 'b', st.st_rdev);
if (r < 0) {
log_error_errno(r, "Failed to detect device %s: %m", device);
goto finish;
}
root_directory = false;
} else {
struct timespec times[2];
/* Find root device */
if (stat("/", &st) < 0) {
r = log_error_errno(errno, "Failed to stat() the root directory: %m");
goto finish;
}
/* Virtual root devices don't need an fsck */
if (major(st.st_dev) == 0) {
log_debug("Root directory is virtual or btrfs, skipping check.");
r = 0;
goto finish;
}
/* check if we are already writable */
times[0] = st.st_atim;
times[1] = st.st_mtim;
if (utimensat(AT_FDCWD, "/", times, 0) == 0) {
log_info("Root directory is writable, skipping check.");
r = 0;
goto finish;
}
r = sd_device_new_from_devnum(&dev, 'b', st.st_dev);
if (r < 0) {
log_error_errno(r, "Failed to detect root device: %m");
goto finish;
}
r = sd_device_get_devname(dev, &device);
if (r < 0) {
log_error_errno(r, "Failed to detect device node of root directory: %m");
goto finish;
}
root_directory = true;
}
r = sd_device_get_property_value(dev, "ID_FS_TYPE", &type);
if (r >= 0) {
r = fsck_exists(type);
if (r < 0)
log_warning_errno(r, "Couldn't detect if fsck.%s may be used for %s, proceeding: %m", type, device);
else if (r == 0) {
log_info("fsck.%s doesn't exist, not checking file system on %s.", type, device);
goto finish;
}
}
if (arg_show_progress) {
if (pipe(progress_pipe) < 0) {
r = log_error_errno(errno, "pipe(): %m");
goto finish;
}
}
pid = fork();
if (pid < 0) {
r = log_error_errno(errno, "fork(): %m");
goto finish;
}
if (pid == 0) {
char dash_c[sizeof("-C")-1 + DECIMAL_STR_MAX(int) + 1];
int progress_socket = -1;
const char *cmdline[9];
int i = 0;
/* Child */
(void) reset_all_signal_handlers();
(void) reset_signal_mask();
assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
/* Close the reading side of the progress pipe */
progress_pipe[0] = safe_close(progress_pipe[0]);
/* Try to connect to a progress management daemon, if there is one */
progress_socket = fsck_progress_socket();
if (progress_socket >= 0) {
/* If this worked we close the progress pipe early, and just use the socket */
progress_pipe[1] = safe_close(progress_pipe[1]);
xsprintf(dash_c, "-C%i", progress_socket);
} else if (progress_pipe[1] >= 0) {
/* Otherwise if we have the progress pipe to our own local handle, we use it */
xsprintf(dash_c, "-C%i", progress_pipe[1]);
} else
dash_c[0] = 0;
cmdline[i++] = "/sbin/fsck";
cmdline[i++] = arg_repair;
cmdline[i++] = "-T";
/*
* Since util-linux v2.25 fsck uses /run/fsck/<diskname>.lock files.
* The previous versions use flock for the device and conflict with
* udevd, see https://bugs.freedesktop.org/show_bug.cgi?id=79576#c5
*/
cmdline[i++] = "-l";
if (!root_directory)
cmdline[i++] = "-M";
if (arg_force)
cmdline[i++] = "-f";
if (!isempty(dash_c))
cmdline[i++] = dash_c;
cmdline[i++] = device;
cmdline[i++] = NULL;
execv(cmdline[0], (char**) cmdline);
_exit(FSCK_OPERATIONAL_ERROR);
}
progress_pipe[1] = safe_close(progress_pipe[1]);
(void) process_progress(progress_pipe[0]);
progress_pipe[0] = -1;
r = wait_for_terminate(pid, &status);
if (r < 0) {
log_error_errno(r, "waitid(): %m");
goto finish;
}
if (status.si_code != CLD_EXITED || (status.si_status & ~1)) {
if (status.si_code == CLD_KILLED || status.si_code == CLD_DUMPED)
log_error("fsck terminated by signal %s.", signal_to_string(status.si_status));
else if (status.si_code == CLD_EXITED)
log_error("fsck failed with error code %i.", status.si_status);
else
log_error("fsck failed due to unknown reason.");
r = -EINVAL;
if (status.si_code == CLD_EXITED && (status.si_status & FSCK_SYSTEM_SHOULD_REBOOT) && root_directory)
/* System should be rebooted. */
start_target(SPECIAL_REBOOT_TARGET, "replace-irreversibly");
else if (status.si_code == CLD_EXITED && (status.si_status & (FSCK_SYSTEM_SHOULD_REBOOT | FSCK_ERRORS_LEFT_UNCORRECTED)))
/* Some other problem */
start_target(SPECIAL_EMERGENCY_TARGET, "replace");
else {
log_warning("Ignoring error.");
r = 0;
}
} else
r = 0;
if (status.si_code == CLD_EXITED && (status.si_status & FSCK_ERROR_CORRECTED))
(void) touch("/run/systemd/quotacheck");
finish:
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}