src/sleep/sleep.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2 /***
   3   Copyright © 2010-2017 Canonical
   4   Copyright © 2018 Dell Inc.
   5 ***/
   6
   7 #include <errno.h>
   8 #include <fcntl.h>
   9 #include <getopt.h>
  10 #include <linux/fiemap.h>
  11 #include <poll.h>
  12 #include <sys/stat.h>
  13 #include <sys/types.h>
  14 #include <sys/timerfd.h>
  15 #include <sys/utsname.h>
  16 #include <unistd.h>
  17
  18 #include "sd-bus.h"
  19 #include "sd-device.h"
  20 #include "sd-id128.h"
  21 #include "sd-messages.h"
  22
  23 #include "battery-util.h"
  24 #include "btrfs-util.h"
  25 #include "build.h"
  26 #include "bus-error.h"
  27 #include "bus-locator.h"
  28 #include "bus-util.h"
  29 #include "constants.h"
  30 #include "devnum-util.h"
  31 #include "efivars.h"
  32 #include "exec-util.h"
  33 #include "fd-util.h"
  34 #include "fileio.h"
  35 #include "format-util.h"
  36 #include "id128-util.h"
  37 #include "io-util.h"
  38 #include "json.h"
  39 #include "log.h"
  40 #include "main-func.h"
  41 #include "os-util.h"
  42 #include "parse-util.h"
  43 #include "pretty-print.h"
  44 #include "sleep-util.h"
  45 #include "special.h"
  46 #include "stdio-util.h"
  47 #include "string-util.h"
  48 #include "strv.h"
  49 #include "time-util.h"
  50
  51 #define DEFAULT_HIBERNATE_DELAY_USEC_NO_BATTERY (2 * USEC_PER_HOUR)
  52
  53 static SleepOperation arg_operation = _SLEEP_OPERATION_INVALID;
  54
  55 static int write_efi_hibernate_location(const HibernateLocation *hibernate_location, bool required) {
  56         int log_level = required ? LOG_ERR : LOG_DEBUG;
  57
  58 #if ENABLE_EFI
  59         _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
  60         _cleanup_free_ char *formatted = NULL, *id = NULL, *image_id = NULL,
  61                        *version_id = NULL, *image_version = NULL;
  62         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
  63         const char *uuid_str;
  64         sd_id128_t uuid;
  65         struct utsname uts = {};
  66         int r, log_level_ignore = required ? LOG_WARNING : LOG_DEBUG;
  67
  68         assert(hibernate_location);
  69         assert(hibernate_location->swap);
  70
  71         if (!is_efi_boot())
  72                 return log_full_errno(log_level, SYNTHETIC_ERRNO(EOPNOTSUPP),
  73                                       "Not an EFI boot, passing HibernateLocation via EFI variable is not possible.");
  74
  75         r = sd_device_new_from_devnum(&device, 'b', hibernate_location->devno);
  76         if (r < 0)
  77                 return log_full_errno(log_level, r, "Failed to create sd-device object for '%s': %m",
  78                                       hibernate_location->swap->path);
  79
  80         r = sd_device_get_property_value(device, "ID_FS_UUID", &uuid_str);
  81         if (r < 0)
  82                 return log_full_errno(log_level, r, "Failed to get filesystem UUID for device '%s': %m",
  83                                       hibernate_location->swap->path);
  84
  85         r = sd_id128_from_string(uuid_str, &uuid);
  86         if (r < 0)
  87                 return log_full_errno(log_level, r, "Failed to parse ID_FS_UUID '%s' for device '%s': %m",
  88                                       uuid_str, hibernate_location->swap->path);
  89
  90         if (uname(&uts) < 0)
  91                 log_full_errno(log_level_ignore, errno, "Failed to get kernel info, ignoring: %m");
  92
  93         r = parse_os_release(NULL,
  94                              "ID", &id,
  95                              "IMAGE_ID", &image_id,
  96                              "VERSION_ID", &version_id,
  97                              "IMAGE_VERSION", &image_version);
  98         if (r < 0)
  99                 log_full_errno(log_level_ignore, r, "Failed to parse os-release, ignoring: %m");
 100
 101         r = json_build(&v, JSON_BUILD_OBJECT(
 102                                JSON_BUILD_PAIR_UUID("uuid", uuid),
 103                                JSON_BUILD_PAIR_UNSIGNED("offset", hibernate_location->offset),
 104                                JSON_BUILD_PAIR_CONDITION(!isempty(uts.release), "kernelVersion", JSON_BUILD_STRING(uts.release)),
 105                                JSON_BUILD_PAIR_CONDITION(id, "osReleaseId", JSON_BUILD_STRING(id)),
 106                                JSON_BUILD_PAIR_CONDITION(image_id, "osReleaseImageId", JSON_BUILD_STRING(image_id)),
 107                                JSON_BUILD_PAIR_CONDITION(version_id, "osReleaseVersionId", JSON_BUILD_STRING(version_id)),
 108                                JSON_BUILD_PAIR_CONDITION(image_version, "osReleaseImageVersion", JSON_BUILD_STRING(image_version))));
 109         if (r < 0)
 110                 return log_full_errno(log_level, r, "Failed to build JSON object: %m");
 111
 112         r = json_variant_format(v, 0, &formatted);
 113         if (r < 0)
 114                 return log_full_errno(log_level, r, "Failed to format JSON object: %m");
 115
 116         r = efi_set_variable_string(EFI_SYSTEMD_VARIABLE(HibernateLocation), formatted);
 117         if (r < 0)
 118                 return log_full_errno(log_level, r, "Failed to set EFI variable HibernateLocation: %m");
 119
 120         log_debug("Set EFI variable HibernateLocation to '%s'.", formatted);
 121         return 0;
 122 #else
 123         return log_full_errno(log_level, SYNTHETIC_ERRNO(EOPNOTSUPP),
 124                               "EFI support not enabled, passing HibernateLocation via EFI variable is not possible.");
 125 #endif
 126 }
 127
 128 static int write_kernel_hibernate_location(const HibernateLocation *hibernate_location) {
 129         assert(hibernate_location);
 130         assert(hibernate_location->swap);
 131         assert(IN_SET(hibernate_location->swap->type, SWAP_BLOCK, SWAP_FILE));
 132
 133         return write_resume_config(hibernate_location->devno, hibernate_location->offset, hibernate_location->swap->path);
 134 }
 135
 136 static int write_mode(char **modes) {
 137         int r = 0;
 138
 139         STRV_FOREACH(mode, modes) {
 140                 int k;
 141
 142                 k = write_string_file("/sys/power/disk", *mode, WRITE_STRING_FILE_DISABLE_BUFFER);
 143                 if (k >= 0)
 144                         return 0;
 145
 146                 log_debug_errno(k, "Failed to write '%s' to /sys/power/disk: %m", *mode);
 147                 if (r >= 0)
 148                         r = k;
 149         }
 150
 151         return r;
 152 }
 153
 154 static int write_state(FILE **f, char **states) {
 155         int r = 0;
 156
 157         assert(f);
 158         assert(*f);
 159
 160         STRV_FOREACH(state, states) {
 161                 int k;
 162
 163                 k = write_string_stream(*f, *state, WRITE_STRING_FILE_DISABLE_BUFFER);
 164                 if (k >= 0)
 165                         return 0;
 166                 log_debug_errno(k, "Failed to write '%s' to /sys/power/state: %m", *state);
 167                 if (r >= 0)
 168                         r = k;
 169
 170                 fclose(*f);
 171                 *f = fopen("/sys/power/state", "we");
 172                 if (!*f)
 173                         return -errno;
 174         }
 175
 176         return r;
 177 }
 178
 179 static int lock_all_homes(void) {
 180         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 181         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
 182         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
 183         int r;
 184
 185         /* Let's synchronously lock all home directories managed by homed that have been marked for it. This
 186          * way the key material required to access these volumes is hopefully removed from memory. */
 187
 188         r = sd_bus_open_system(&bus);
 189         if (r < 0)
 190                 return log_warning_errno(r, "Failed to connect to system bus, ignoring: %m");
 191
 192         r = bus_message_new_method_call(bus, &m, bus_home_mgr, "LockAllHomes");
 193         if (r < 0)
 194                 return bus_log_create_error(r);
 195
 196         /* If homed is not running it can't have any home directories active either. */
 197         r = sd_bus_message_set_auto_start(m, false);
 198         if (r < 0)
 199                 return log_error_errno(r, "Failed to disable auto-start of LockAllHomes() message: %m");
 200
 201         r = sd_bus_call(bus, m, DEFAULT_TIMEOUT_USEC, &error, NULL);
 202         if (r < 0) {
 203                 if (!bus_error_is_unknown_service(&error))
 204                         return log_error_errno(r, "Failed to lock home directories: %s", bus_error_message(&error, r));
 205
 206                 log_debug("systemd-homed is not running, locking of home directories skipped.");
 207         } else
 208                 log_debug("Successfully requested locking of all home directories.");
 209         return 0;
 210 }
 211
 212 static int execute(
 213                 const SleepConfig *sleep_config,
 214                 SleepOperation operation,
 215                 const char *action) {
 216
 217         char *arguments[] = {
 218                 NULL,
 219                 (char*) "pre",
 220                 /* NB: we use 'arg_operation' instead of 'operation' here, as we want to communicate the overall
 221                  * operation here, not the specific one, in case of s2h. */
 222                 (char*) sleep_operation_to_string(arg_operation),
 223                 NULL
 224         };
 225         static const char* const dirs[] = {
 226                 SYSTEM_SLEEP_PATH,
 227                 NULL
 228         };
 229
 230         _cleanup_(hibernate_location_freep) HibernateLocation *hibernate_location = NULL;
 231         _cleanup_fclose_ FILE *f = NULL;
 232         char **modes, **states;
 233         int r;
 234
 235         assert(sleep_config);
 236         assert(operation >= 0);
 237         assert(operation < _SLEEP_OPERATION_MAX);
 238         assert(operation != SLEEP_SUSPEND_THEN_HIBERNATE); /* Handled by execute_s2h() instead */
 239
 240         states = sleep_config->states[operation];
 241         modes = sleep_config->modes[operation];
 242
 243         if (strv_isempty(states))
 244                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 245                                        "No sleep states configured for sleep operation %s, can't sleep.",
 246                                        sleep_operation_to_string(operation));
 247
 248         /* This file is opened first, so that if we hit an error,
 249          * we can abort before modifying any state. */
 250         f = fopen("/sys/power/state", "we");
 251         if (!f)
 252                 return log_error_errno(errno, "Failed to open /sys/power/state: %m");
 253
 254         setvbuf(f, NULL, _IONBF, 0);
 255
 256         /* Configure hibernation settings if we are supposed to hibernate */
 257         if (!strv_isempty(modes)) {
 258                 bool resume_set;
 259
 260                 r = find_hibernate_location(&hibernate_location);
 261                 if (r < 0)
 262                         return log_error_errno(r, "Failed to find location to hibernate to: %m");
 263                 resume_set = r > 0;
 264
 265                 r = write_efi_hibernate_location(hibernate_location, !resume_set);
 266                 if (!resume_set) {
 267                         if (r == -EOPNOTSUPP)
 268                                 return log_error_errno(r, "No valid 'resume=' option found, refusing to hibernate.");
 269                         if (r < 0)
 270                                 return r;
 271
 272                         r = write_kernel_hibernate_location(hibernate_location);
 273                         if (r < 0)
 274                                 return log_error_errno(r, "Failed to prepare for hibernation: %m");
 275                 }
 276
 277                 r = write_mode(modes);
 278                 if (r < 0)
 279                         return log_error_errno(r, "Failed to write mode to /sys/power/disk: %m");
 280         }
 281
 282         /* Pass an action string to the call-outs. This is mostly our operation string, except if the
 283          * hibernate step of s-t-h fails, in which case we communicate that with a separate action. */
 284         if (!action)
 285                 action = sleep_operation_to_string(operation);
 286
 287         r = setenv("SYSTEMD_SLEEP_ACTION", action, 1);
 288         if (r != 0)
 289                 log_warning_errno(errno, "Error setting SYSTEMD_SLEEP_ACTION=%s, ignoring: %m", action);
 290
 291         (void) execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments, NULL, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS);
 292         (void) lock_all_homes();
 293
 294         log_struct(LOG_INFO,
 295                    "MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR,
 296                    LOG_MESSAGE("Entering sleep state '%s'...", sleep_operation_to_string(operation)),
 297                    "SLEEP=%s", sleep_operation_to_string(arg_operation));
 298
 299         r = write_state(&f, states);
 300         if (r < 0)
 301                 log_struct_errno(LOG_ERR, r,
 302                                  "MESSAGE_ID=" SD_MESSAGE_SLEEP_STOP_STR,
 303                                  LOG_MESSAGE("Failed to put system to sleep. System resumed again: %m"),
 304                                  "SLEEP=%s", sleep_operation_to_string(arg_operation));
 305         else
 306                 log_struct(LOG_INFO,
 307                            "MESSAGE_ID=" SD_MESSAGE_SLEEP_STOP_STR,
 308                            LOG_MESSAGE("System returned from sleep state."),
 309                            "SLEEP=%s", sleep_operation_to_string(arg_operation));
 310
 311         arguments[1] = (char*) "post";
 312         (void) execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments, NULL, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS);
 313
 314         return r;
 315 }
 316
 317 static int custom_timer_suspend(const SleepConfig *sleep_config) {
 318         usec_t hibernate_timestamp;
 319         int r;
 320
 321         assert(sleep_config);
 322
 323         hibernate_timestamp = usec_add(now(CLOCK_BOOTTIME), sleep_config->hibernate_delay_usec);
 324
 325         while (battery_is_discharging_and_low() == 0) {
 326                 _cleanup_hashmap_free_ Hashmap *last_capacity = NULL, *current_capacity = NULL;
 327                 _cleanup_close_ int tfd = -EBADF;
 328                 struct itimerspec ts = {};
 329                 usec_t suspend_interval;
 330                 bool woken_by_timer;
 331
 332                 tfd = timerfd_create(CLOCK_BOOTTIME_ALARM, TFD_NONBLOCK|TFD_CLOEXEC);
 333                 if (tfd < 0)
 334                         return log_error_errno(errno, "Error creating timerfd: %m");
 335
 336                 /* Store current battery capacity before suspension */
 337                 r = fetch_batteries_capacity_by_name(&last_capacity);
 338                 if (r < 0)
 339                         return log_error_errno(r, "Error fetching battery capacity percentage: %m");
 340
 341                 if (hashmap_isempty(last_capacity))
 342                         /* In case of no battery, system suspend interval will be set to HibernateDelaySec= or 2 hours. */
 343                         suspend_interval = timestamp_is_set(hibernate_timestamp)
 344                                            ? sleep_config->hibernate_delay_usec : DEFAULT_HIBERNATE_DELAY_USEC_NO_BATTERY;
 345                 else {
 346                         r = get_total_suspend_interval(last_capacity, &suspend_interval);
 347                         if (r < 0) {
 348                                 log_debug_errno(r, "Failed to estimate suspend interval using previous discharge rate, ignoring: %m");
 349                                 /* In case of any errors, especially when we do not know the battery
 350                                  * discharging rate, system suspend interval will be set to
 351                                  * SuspendEstimationSec=. */
 352                                 suspend_interval = sleep_config->suspend_estimation_usec;
 353                         }
 354                 }
 355
 356                 /* Do not suspend more than HibernateDelaySec= */
 357                 usec_t before_timestamp = now(CLOCK_BOOTTIME);
 358                 suspend_interval = MIN(suspend_interval, usec_sub_unsigned(hibernate_timestamp, before_timestamp));
 359                 if (suspend_interval <= 0)
 360                         break; /* system should hibernate */
 361
 362                 log_debug("Set timerfd wake alarm for %s", FORMAT_TIMESPAN(suspend_interval, USEC_PER_SEC));
 363                 /* Wake alarm for system with or without battery to hibernate or estimate discharge rate whichever is applicable */
 364                 timespec_store(&ts.it_value, suspend_interval);
 365
 366                 if (timerfd_settime(tfd, 0, &ts, NULL) < 0)
 367                         return log_error_errno(errno, "Error setting battery estimate timer: %m");
 368
 369                 r = execute(sleep_config, SLEEP_SUSPEND, NULL);
 370                 if (r < 0)
 371                         return r;
 372
 373                 r = fd_wait_for_event(tfd, POLLIN, 0);
 374                 if (r < 0)
 375                         return log_error_errno(r, "Error polling timerfd: %m");
 376                 /* Store fd_wait status */
 377                 woken_by_timer = FLAGS_SET(r, POLLIN);
 378
 379                 r = fetch_batteries_capacity_by_name(&current_capacity);
 380                 if (r < 0 || hashmap_isempty(current_capacity)) {
 381                         /* In case of no battery or error while getting charge level, no need to measure
 382                          * discharge rate. Instead the system should wake up if it is manual wakeup or
 383                          * hibernate if this is a timer wakeup. */
 384                         if (r < 0)
 385                                 log_debug_errno(r, "Battery capacity percentage unavailable, cannot estimate discharge rate: %m");
 386                         else
 387                                 log_debug("No battery found.");
 388                         if (!woken_by_timer)
 389                                 return 0;
 390                         break;
 391                 }
 392
 393                 usec_t after_timestamp = now(CLOCK_BOOTTIME);
 394                 log_debug("Attempting to estimate battery discharge rate after wakeup from %s sleep",
 395                           FORMAT_TIMESPAN(after_timestamp - before_timestamp, USEC_PER_HOUR));
 396
 397                 if (after_timestamp != before_timestamp) {
 398                         r = estimate_battery_discharge_rate_per_hour(last_capacity, current_capacity, before_timestamp, after_timestamp);
 399                         if (r < 0)
 400                                 log_warning_errno(r, "Failed to estimate and update battery discharge rate, ignoring: %m");
 401                 } else
 402                         log_debug("System woke up too early to estimate discharge rate");
 403
 404                 if (!woken_by_timer)
 405                         /* Return as manual wakeup done. This also will return in case battery was charged during suspension */
 406                         return 0;
 407
 408                 r = check_wakeup_type();
 409                 if (r < 0)
 410                         log_debug_errno(r, "Failed to check hardware wakeup type, ignoring: %m");
 411                 if (r > 0) {
 412                         log_debug("wakeup type is APM timer");
 413                         /* system should hibernate */
 414                         break;
 415                 }
 416         }
 417
 418         return 1;
 419 }
 420
 421 /* Freeze when invoked and thaw on cleanup */
 422 static int freeze_thaw_user_slice(const char **method) {
 423         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 424         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
 425         int r;
 426
 427         if (!method || !*method)
 428                 return 0;
 429
 430         r = bus_connect_system_systemd(&bus);
 431         if (r < 0)
 432                 return log_debug_errno(r, "Failed to open connection to systemd: %m");
 433
 434         (void) sd_bus_set_method_call_timeout(bus, FREEZE_TIMEOUT);
 435
 436         r = bus_call_method(bus, bus_systemd_mgr, *method, &error, NULL, "s", SPECIAL_USER_SLICE);
 437         if (r < 0)
 438                 return log_debug_errno(r, "Failed to execute operation: %s", bus_error_message(&error, r));
 439
 440         return 1;
 441 }
 442
 443 static int execute_s2h(const SleepConfig *sleep_config) {
 444         _unused_ _cleanup_(freeze_thaw_user_slice) const char *auto_method_thaw = "ThawUnit";
 445         int r;
 446
 447         assert(sleep_config);
 448
 449         r = freeze_thaw_user_slice(&(const char*) { "FreezeUnit" });
 450         if (r < 0)
 451                 log_debug_errno(r, "Failed to freeze unit user.slice, ignoring: %m");
 452
 453         /* Only check if we have automated battery alarms if HibernateDelaySec= is not set, as in that case
 454          * we'll busy poll for the configured interval instead */
 455         if (!timestamp_is_set(sleep_config->hibernate_delay_usec)) {
 456                 r = check_wakeup_type();
 457                 if (r < 0)
 458                         log_debug_errno(r, "Failed to check hardware wakeup type, ignoring: %m");
 459                 else {
 460                         r = battery_trip_point_alarm_exists();
 461                         if (r < 0)
 462                                 log_debug_errno(r, "Failed to check whether acpi_btp support is enabled or not, ignoring: %m");
 463                 }
 464         } else
 465                 r = 0;  /* Force fallback path */
 466
 467         if (r > 0) { /* If we have both wakeup alarms and battery trip point support, use them */
 468                 log_debug("Attempting to suspend...");
 469                 r = execute(sleep_config, SLEEP_SUSPEND, NULL);
 470                 if (r < 0)
 471                         return r;
 472
 473                 r = check_wakeup_type();
 474                 if (r < 0)
 475                         return log_debug_errno(r, "Failed to check hardware wakeup type: %m");
 476
 477                 if (r == 0)
 478                         /* For APM Timer wakeup, system should hibernate else wakeup */
 479                         return 0;
 480         } else {
 481                 r = custom_timer_suspend(sleep_config);
 482                 if (r < 0)
 483                         return log_debug_errno(r, "Suspend cycle with manual battery discharge rate estimation failed: %m");
 484                 if (r == 0)
 485                         /* manual wakeup */
 486                         return 0;
 487         }
 488         /* For above custom timer, if 1 is returned, system will directly hibernate */
 489
 490         log_debug("Attempting to hibernate");
 491         r = execute(sleep_config, SLEEP_HIBERNATE, NULL);
 492         if (r < 0) {
 493                 log_notice("Couldn't hibernate, will try to suspend again.");
 494
 495                 r = execute(sleep_config, SLEEP_SUSPEND, "suspend-after-failed-hibernate");
 496                 if (r < 0)
 497                         return r;
 498         }
 499
 500         return 0;
 501 }
 502
 503 static int help(void) {
 504         _cleanup_free_ char *link = NULL;
 505         int r;
 506
 507         r = terminal_urlify_man("systemd-suspend.service", "8", &link);
 508         if (r < 0)
 509                 return log_oom();
 510
 511         printf("%s COMMAND\n\n"
 512                "Suspend the system, hibernate the system, or both.\n\n"
 513                "  -h --help              Show this help and exit\n"
 514                "  --version              Print version string and exit\n"
 515                "\nCommands:\n"
 516                "  suspend                Suspend the system\n"
 517                "  hibernate              Hibernate the system\n"
 518                "  hybrid-sleep           Both hibernate and suspend the system\n"
 519                "  suspend-then-hibernate Initially suspend and then hibernate\n"
 520                "                         the system after a fixed period of time\n"
 521                "\nSee the %s for details.\n",
 522                program_invocation_short_name,
 523                link);
 524
 525         return 0;
 526 }
 527
 528 static int parse_argv(int argc, char *argv[]) {
 529         enum {
 530                 ARG_VERSION = 0x100,
 531         };
 532
 533         static const struct option options[] = {
 534                 { "help",         no_argument,       NULL, 'h'           },
 535                 { "version",      no_argument,       NULL, ARG_VERSION   },
 536                 {}
 537         };
 538
 539         int c;
 540
 541         assert(argc >= 0);
 542         assert(argv);
 543
 544         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 545                 switch (c) {
 546                 case 'h':
 547                         return help();
 548
 549                 case ARG_VERSION:
 550                         return version();
 551
 552                 case '?':
 553                         return -EINVAL;
 554
 555                 default:
 556                         assert_not_reached();
 557                 }
 558
 559         if (argc - optind != 1)
 560                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 561                                        "Usage: %s COMMAND",
 562                                        program_invocation_short_name);
 563
 564         arg_operation = sleep_operation_from_string(argv[optind]);
 565         if (arg_operation < 0)
 566                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown command '%s'.", argv[optind]);
 567
 568         return 1 /* work to do */;
 569 }
 570
 571 static int run(int argc, char *argv[]) {
 572         _cleanup_(free_sleep_configp) SleepConfig *sleep_config = NULL;
 573         int r;
 574
 575         log_setup();
 576
 577         r = parse_argv(argc, argv);
 578         if (r <= 0)
 579                 return r;
 580
 581         r = parse_sleep_config(&sleep_config);
 582         if (r < 0)
 583                 return r;
 584
 585         if (!sleep_config->allow[arg_operation])
 586                 return log_error_errno(SYNTHETIC_ERRNO(EACCES),
 587                                        "Sleep operation \"%s\" is disabled by configuration, refusing.",
 588                                        sleep_operation_to_string(arg_operation));
 589
 590         switch (arg_operation) {
 591
 592         case SLEEP_SUSPEND_THEN_HIBERNATE:
 593                 r = execute_s2h(sleep_config);
 594                 break;
 595
 596         case SLEEP_HYBRID_SLEEP:
 597                 r = execute(sleep_config, SLEEP_HYBRID_SLEEP, NULL);
 598                 if (r < 0) {
 599                         /* If we can't hybrid sleep, then let's try to suspend at least. After all, the user
 600                          * asked us to do both: suspend + hibernate, and it's almost certainly the
 601                          * hibernation that failed, hence still do the other thing, the suspend. */
 602
 603                         log_notice("Couldn't hybrid sleep, will try to suspend instead.");
 604
 605                         r = execute(sleep_config, SLEEP_SUSPEND, "suspend-after-failed-hybrid-sleep");
 606                 }
 607
 608                 break;
 609
 610         default:
 611                 r = execute(sleep_config, arg_operation, NULL);
 612                 break;
 613         }
 614
 615         return r;
 616 }
 617
 618 DEFINE_MAIN_FUNCTION(run);