4afd3348c7
GLIB has recently started to officially support the gcc cleanup attribute in its public API, hence let's do the same for our APIs. With this patch we'll define an xyz_unrefp() call for each public xyz_unref() call, to make it easy to use inside a __attribute__((cleanup())) expression. Then, all code is ported over to make use of this. The new calls are also documented in the man pages, with examples how to use them (well, I only added docs where the _unref() call itself already had docs, and the examples, only cover sd_bus_unrefp() and sd_event_unrefp()). This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we tend to call our destructors these days. Note that this defines no public macro that wraps gcc's attribute and makes it easier to use. While I think it's our duty in the library to make our stuff easy to use, I figure it's not our duty to make gcc's own features easy to use on its own. Most likely, client code which wants to make use of this should define its own: #define _cleanup_(function) __attribute__((cleanup(function))) Or similar, to make the gcc feature easier to use. Making this logic public has the benefit that we can remove three header files whose only purpose was to define these functions internally. See #2008.
490 lines
16 KiB
C
490 lines
16 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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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) {
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int r;
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assert(key);
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if (streq(key, "fsck.mode") && value) {
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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") && value) {
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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, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 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 = parse_proc_cmdline(parse_proc_cmdline_item);
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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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