3f2e15abc5
We use "writable" everywhere else.
398 lines
14 KiB
C
398 lines
14 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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Copyright © 2010-2017 Canonical
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Copyright © 2018 Dell Inc.
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***/
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <linux/fiemap.h>
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#include <poll.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/timerfd.h>
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#include <unistd.h>
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#include "sd-messages.h"
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#include "btrfs-util.h"
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#include "bus-error.h"
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#include "def.h"
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#include "exec-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "format-util.h"
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#include "io-util.h"
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#include "log.h"
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#include "main-func.h"
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#include "parse-util.h"
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#include "pretty-print.h"
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#include "sleep-config.h"
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#include "stdio-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "time-util.h"
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#include "util.h"
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static char* arg_verb = NULL;
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STATIC_DESTRUCTOR_REGISTER(arg_verb, freep);
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static int write_hibernate_location_info(const HibernateLocation *hibernate_location) {
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char offset_str[DECIMAL_STR_MAX(uint64_t)];
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char resume_str[DECIMAL_STR_MAX(unsigned) * 2 + STRLEN(":")];
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int r;
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assert(hibernate_location);
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assert(hibernate_location->swap);
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xsprintf(resume_str, "%u:%u", major(hibernate_location->devno), minor(hibernate_location->devno));
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r = write_string_file("/sys/power/resume", resume_str, WRITE_STRING_FILE_DISABLE_BUFFER);
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if (r < 0)
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return log_debug_errno(r, "Failed to write partition device to /sys/power/resume for '%s': '%s': %m",
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hibernate_location->swap->device, resume_str);
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log_debug("Wrote resume= value for %s to /sys/power/resume: %s", hibernate_location->swap->device, resume_str);
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/* if it's a swap partition, we're done */
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if (streq(hibernate_location->swap->type, "partition"))
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return r;
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if (!streq(hibernate_location->swap->type, "file"))
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return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
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"Invalid hibernate type: %s", hibernate_location->swap->type);
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/* Only available in 4.17+ */
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if (hibernate_location->offset > 0 && access("/sys/power/resume_offset", W_OK) < 0) {
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if (errno == ENOENT) {
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log_debug("Kernel too old, can't configure resume_offset for %s, ignoring: %" PRIu64,
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hibernate_location->swap->device, hibernate_location->offset);
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return 0;
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}
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return log_debug_errno(errno, "/sys/power/resume_offset not writable: %m");
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}
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xsprintf(offset_str, "%" PRIu64, hibernate_location->offset);
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r = write_string_file("/sys/power/resume_offset", offset_str, WRITE_STRING_FILE_DISABLE_BUFFER);
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if (r < 0)
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return log_debug_errno(r, "Failed to write swap file offset to /sys/power/resume_offset for '%s': '%s': %m",
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hibernate_location->swap->device, offset_str);
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log_debug("Wrote resume_offset= value for %s to /sys/power/resume_offset: %s", hibernate_location->swap->device, offset_str);
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return 0;
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}
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static int write_mode(char **modes) {
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int r = 0;
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char **mode;
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STRV_FOREACH(mode, modes) {
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int k;
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k = write_string_file("/sys/power/disk", *mode, WRITE_STRING_FILE_DISABLE_BUFFER);
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if (k >= 0)
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return 0;
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log_debug_errno(k, "Failed to write '%s' to /sys/power/disk: %m", *mode);
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if (r >= 0)
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r = k;
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}
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return r;
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}
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static int write_state(FILE **f, char **states) {
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char **state;
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int r = 0;
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assert(f);
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assert(*f);
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STRV_FOREACH(state, states) {
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int k;
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k = write_string_stream(*f, *state, WRITE_STRING_FILE_DISABLE_BUFFER);
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if (k >= 0)
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return 0;
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log_debug_errno(k, "Failed to write '%s' to /sys/power/state: %m", *state);
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if (r >= 0)
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r = k;
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fclose(*f);
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*f = fopen("/sys/power/state", "we");
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if (!*f)
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return -errno;
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}
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return r;
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}
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static int lock_all_homes(void) {
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = 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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/* Let's synchronously lock all home directories managed by homed that have been marked for it. This
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* way the key material required to access these volumes is hopefully removed from memory. */
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r = sd_bus_open_system(&bus);
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if (r < 0)
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return log_warning_errno(r, "Failed to connect to system bus, ignoring: %m");
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r = sd_bus_message_new_method_call(
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bus,
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&m,
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"org.freedesktop.home1",
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"/org/freedesktop/home1",
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"org.freedesktop.home1.Manager",
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"LockAllHomes");
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if (r < 0)
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return bus_log_create_error(r);
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/* If homed is not running it can't have any home directories active either. */
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r = sd_bus_message_set_auto_start(m, false);
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if (r < 0)
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return log_error_errno(r, "Failed to disable auto-start of LockAllHomes() message: %m");
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r = sd_bus_call(bus, m, DEFAULT_TIMEOUT_USEC, &error, NULL);
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if (r < 0) {
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if (sd_bus_error_has_name(&error, SD_BUS_ERROR_SERVICE_UNKNOWN) ||
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sd_bus_error_has_name(&error, SD_BUS_ERROR_NAME_HAS_NO_OWNER)) {
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log_debug("systemd-homed is not running, skipping locking of home directories.");
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return 0;
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}
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return log_error_errno(r, "Failed to lock home directories: %s", bus_error_message(&error, r));
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}
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log_debug("Successfully requested for all home directories to be locked.");
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return 0;
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}
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static int execute(char **modes, char **states) {
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char *arguments[] = {
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NULL,
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(char*) "pre",
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arg_verb,
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NULL
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};
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static const char* const dirs[] = {
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SYSTEM_SLEEP_PATH,
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NULL
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};
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_cleanup_fclose_ FILE *f = NULL;
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_cleanup_(hibernate_location_freep) HibernateLocation *hibernate_location = NULL;
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int r;
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/* This file is opened first, so that if we hit an error,
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* we can abort before modifying any state. */
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f = fopen("/sys/power/state", "we");
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if (!f)
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return log_error_errno(errno, "Failed to open /sys/power/state: %m");
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setvbuf(f, NULL, _IONBF, 0);
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/* Configure hibernation settings if we are supposed to hibernate */
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if (!strv_isempty(modes)) {
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r = find_hibernate_location(&hibernate_location);
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if (r < 0)
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return log_error_errno(r, "Failed to find location to hibernate to: %m");
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if (r == 0) { /* 0 means: no hibernation location was configured in the kernel so far, let's
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* do it ourselves then. > 0 means: kernel already had a configured hibernation
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* location which we shouldn't touch. */
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r = write_hibernate_location_info(hibernate_location);
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if (r < 0)
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return log_error_errno(r, "Failed to prepare for hibernation: %m");
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}
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r = write_mode(modes);
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if (r < 0)
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return log_error_errno(r, "Failed to write mode to /sys/power/disk: %m");;
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}
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(void) execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments, NULL, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS);
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(void) lock_all_homes();
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log_struct(LOG_INFO,
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"MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR,
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LOG_MESSAGE("Suspending system..."),
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"SLEEP=%s", arg_verb);
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r = write_state(&f, states);
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if (r < 0)
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log_struct_errno(LOG_ERR, r,
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"MESSAGE_ID=" SD_MESSAGE_SLEEP_STOP_STR,
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LOG_MESSAGE("Failed to suspend system. System resumed again: %m"),
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"SLEEP=%s", arg_verb);
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else
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log_struct(LOG_INFO,
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"MESSAGE_ID=" SD_MESSAGE_SLEEP_STOP_STR,
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LOG_MESSAGE("System resumed."),
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"SLEEP=%s", arg_verb);
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arguments[1] = (char*) "post";
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(void) execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments, NULL, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS);
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return r;
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}
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static int execute_s2h(const SleepConfig *sleep_config) {
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_cleanup_close_ int tfd = -1;
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char buf[FORMAT_TIMESPAN_MAX];
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struct itimerspec ts = {};
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int r;
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assert(sleep_config);
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tfd = timerfd_create(CLOCK_BOOTTIME_ALARM, TFD_NONBLOCK|TFD_CLOEXEC);
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if (tfd < 0)
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return log_error_errno(errno, "Error creating timerfd: %m");
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log_debug("Set timerfd wake alarm for %s",
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format_timespan(buf, sizeof(buf), sleep_config->hibernate_delay_sec, USEC_PER_SEC));
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timespec_store(&ts.it_value, sleep_config->hibernate_delay_sec);
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r = timerfd_settime(tfd, 0, &ts, NULL);
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if (r < 0)
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return log_error_errno(errno, "Error setting hibernate timer: %m");
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r = execute(sleep_config->suspend_modes, sleep_config->suspend_states);
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if (r < 0)
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return r;
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r = fd_wait_for_event(tfd, POLLIN, 0);
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if (r < 0)
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return log_error_errno(r, "Error polling timerfd: %m");
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if (!FLAGS_SET(r, POLLIN)) /* We woke up before the alarm time, we are done. */
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return 0;
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tfd = safe_close(tfd);
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/* If woken up after alarm time, hibernate */
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log_debug("Attempting to hibernate after waking from %s timer",
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format_timespan(buf, sizeof(buf), sleep_config->hibernate_delay_sec, USEC_PER_SEC));
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r = execute(sleep_config->hibernate_modes, sleep_config->hibernate_states);
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if (r < 0) {
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log_notice_errno(r, "Couldn't hibernate, will try to suspend again: %m");
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r = execute(sleep_config->suspend_modes, sleep_config->suspend_states);
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if (r < 0)
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return log_error_errno(r, "Could neither hibernate nor suspend, giving up: %m");
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}
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return 0;
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}
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static int help(void) {
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_cleanup_free_ char *link = NULL;
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int r;
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r = terminal_urlify_man("systemd-suspend.service", "8", &link);
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if (r < 0)
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return log_oom();
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printf("%s COMMAND\n\n"
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"Suspend the system, hibernate the system, or both.\n\n"
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" -h --help Show this help and exit\n"
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" --version Print version string and exit\n"
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"\nCommands:\n"
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" suspend Suspend the system\n"
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" hibernate Hibernate the system\n"
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" hybrid-sleep Both hibernate and suspend the system\n"
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" suspend-then-hibernate Initially suspend and then hibernate\n"
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" the system after a fixed period of time\n"
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"\nSee the %s for details.\n"
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, program_invocation_short_name
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, link
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);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{}
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};
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int c;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
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switch(c) {
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case 'h':
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return help();
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case ARG_VERSION:
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return version();
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unhandled option");
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}
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if (argc - optind != 1)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Usage: %s COMMAND",
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program_invocation_short_name);
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arg_verb = strdup(argv[optind]);
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if (!arg_verb)
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return log_oom();
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if (!STR_IN_SET(arg_verb, "suspend", "hibernate", "hybrid-sleep", "suspend-then-hibernate"))
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unknown command '%s'.", arg_verb);
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return 1 /* work to do */;
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}
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static int run(int argc, char *argv[]) {
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bool allow;
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char **modes = NULL, **states = NULL;
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_cleanup_(free_sleep_configp) SleepConfig *sleep_config = NULL;
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int r;
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log_setup_service();
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r = parse_argv(argc, argv);
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if (r <= 0)
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return r;
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r = parse_sleep_config(&sleep_config);
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if (r < 0)
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return r;
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r = sleep_settings(arg_verb, sleep_config, &allow, &modes, &states);
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if (r < 0)
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return r;
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if (!allow)
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return log_error_errno(SYNTHETIC_ERRNO(EACCES),
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"Sleep mode \"%s\" is disabled by configuration, refusing.",
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arg_verb);
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if (streq(arg_verb, "suspend-then-hibernate"))
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return execute_s2h(sleep_config);
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else
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return execute(modes, states);
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}
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DEFINE_MAIN_FUNCTION(run);
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