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