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                 if (!resume_set) {
 266                         r = write_kernel_hibernate_location(hibernate_location);
 267                         if (r < 0)
 268                                 return log_error_errno(r, "Failed to prepare for hibernation: %m");
 269                 }
 270
 271                 r = write_efi_hibernate_location(hibernate_location, !resume_set);
 272                 if (r < 0 && !resume_set)
 273                         return r;
 274
 275                 r = write_mode(modes);
 276                 if (r < 0)
 277                         return log_error_errno(r, "Failed to write mode to /sys/power/disk: %m");
 278         }
 279
 280         /* Pass an action string to the call-outs. This is mostly our operation string, except if the
 281          * hibernate step of s-t-h fails, in which case we communicate that with a separate action. */
 282         if (!action)
 283                 action = sleep_operation_to_string(operation);
 284
 285         r = setenv("SYSTEMD_SLEEP_ACTION", action, 1);
 286         if (r != 0)
 287                 log_warning_errno(errno, "Error setting SYSTEMD_SLEEP_ACTION=%s, ignoring: %m", action);
 288
 289         (void) execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments, NULL, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS);
 290         (void) lock_all_homes();
 291
 292         log_struct(LOG_INFO,
 293                    "MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR,
 294                    LOG_MESSAGE("Entering sleep state '%s'...", sleep_operation_to_string(operation)),
 295                    "SLEEP=%s", sleep_operation_to_string(arg_operation));
 296
 297         r = write_state(&f, states);
 298         if (r < 0)
 299                 log_struct_errno(LOG_ERR, r,
 300                                  "MESSAGE_ID=" SD_MESSAGE_SLEEP_STOP_STR,
 301                                  LOG_MESSAGE("Failed to put system to sleep. System resumed again: %m"),
 302                                  "SLEEP=%s", sleep_operation_to_string(arg_operation));
 303         else
 304                 log_struct(LOG_INFO,
 305                            "MESSAGE_ID=" SD_MESSAGE_SLEEP_STOP_STR,
 306                            LOG_MESSAGE("System returned from sleep state."),
 307                            "SLEEP=%s", sleep_operation_to_string(arg_operation));
 308
 309         arguments[1] = (char*) "post";
 310         (void) execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments, NULL, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS);
 311
 312         return r;
 313 }
 314
 315 static int custom_timer_suspend(const SleepConfig *sleep_config) {
 316         usec_t hibernate_timestamp;
 317         int r;
 318
 319         assert(sleep_config);
 320
 321         hibernate_timestamp = usec_add(now(CLOCK_BOOTTIME), sleep_config->hibernate_delay_usec);
 322
 323         while (battery_is_discharging_and_low() == 0) {
 324                 _cleanup_hashmap_free_ Hashmap *last_capacity = NULL, *current_capacity = NULL;
 325                 _cleanup_close_ int tfd = -EBADF;
 326                 struct itimerspec ts = {};
 327                 usec_t suspend_interval;
 328                 bool woken_by_timer;
 329
 330                 tfd = timerfd_create(CLOCK_BOOTTIME_ALARM, TFD_NONBLOCK|TFD_CLOEXEC);
 331                 if (tfd < 0)
 332                         return log_error_errno(errno, "Error creating timerfd: %m");
 333
 334                 /* Store current battery capacity before suspension */
 335                 r = fetch_batteries_capacity_by_name(&last_capacity);
 336                 if (r < 0)
 337                         return log_error_errno(r, "Error fetching battery capacity percentage: %m");
 338
 339                 if (hashmap_isempty(last_capacity))
 340                         /* In case of no battery, system suspend interval will be set to HibernateDelaySec= or 2 hours. */
 341                         suspend_interval = timestamp_is_set(hibernate_timestamp)
 342                                            ? sleep_config->hibernate_delay_usec : DEFAULT_HIBERNATE_DELAY_USEC_NO_BATTERY;
 343                 else {
 344                         r = get_total_suspend_interval(last_capacity, &suspend_interval);
 345                         if (r < 0) {
 346                                 log_debug_errno(r, "Failed to estimate suspend interval using previous discharge rate, ignoring: %m");
 347                                 /* In case of any errors, especially when we do not know the battery
 348                                  * discharging rate, system suspend interval will be set to
 349                                  * SuspendEstimationSec=. */
 350                                 suspend_interval = sleep_config->suspend_estimation_usec;
 351                         }
 352                 }
 353
 354                 /* Do not suspend more than HibernateDelaySec= */
 355                 usec_t before_timestamp = now(CLOCK_BOOTTIME);
 356                 suspend_interval = MIN(suspend_interval, usec_sub_unsigned(hibernate_timestamp, before_timestamp));
 357                 if (suspend_interval <= 0)
 358                         break; /* system should hibernate */
 359
 360                 log_debug("Set timerfd wake alarm for %s", FORMAT_TIMESPAN(suspend_interval, USEC_PER_SEC));
 361                 /* Wake alarm for system with or without battery to hibernate or estimate discharge rate whichever is applicable */
 362                 timespec_store(&ts.it_value, suspend_interval);
 363
 364                 if (timerfd_settime(tfd, 0, &ts, NULL) < 0)
 365                         return log_error_errno(errno, "Error setting battery estimate timer: %m");
 366
 367                 r = execute(sleep_config, SLEEP_SUSPEND, NULL);
 368                 if (r < 0)
 369                         return r;
 370
 371                 r = fd_wait_for_event(tfd, POLLIN, 0);
 372                 if (r < 0)
 373                         return log_error_errno(r, "Error polling timerfd: %m");
 374                 /* Store fd_wait status */
 375                 woken_by_timer = FLAGS_SET(r, POLLIN);
 376
 377                 r = fetch_batteries_capacity_by_name(&current_capacity);
 378                 if (r < 0 || hashmap_isempty(current_capacity)) {
 379                         /* In case of no battery or error while getting charge level, no need to measure
 380                          * discharge rate. Instead the system should wake up if it is manual wakeup or
 381                          * hibernate if this is a timer wakeup. */
 382                         if (r < 0)
 383                                 log_debug_errno(r, "Battery capacity percentage unavailable, cannot estimate discharge rate: %m");
 384                         else
 385                                 log_debug("No battery found.");
 386                         if (!woken_by_timer)
 387                                 return 0;
 388                         break;
 389                 }
 390
 391                 usec_t after_timestamp = now(CLOCK_BOOTTIME);
 392                 log_debug("Attempting to estimate battery discharge rate after wakeup from %s sleep",
 393                           FORMAT_TIMESPAN(after_timestamp - before_timestamp, USEC_PER_HOUR));
 394
 395                 if (after_timestamp != before_timestamp) {
 396                         r = estimate_battery_discharge_rate_per_hour(last_capacity, current_capacity, before_timestamp, after_timestamp);
 397                         if (r < 0)
 398                                 log_warning_errno(r, "Failed to estimate and update battery discharge rate, ignoring: %m");
 399                 } else
 400                         log_debug("System woke up too early to estimate discharge rate");
 401
 402                 if (!woken_by_timer)
 403                         /* Return as manual wakeup done. This also will return in case battery was charged during suspension */
 404                         return 0;
 405
 406                 r = check_wakeup_type();
 407                 if (r < 0)
 408                         log_debug_errno(r, "Failed to check hardware wakeup type, ignoring: %m");
 409                 if (r > 0) {
 410                         log_debug("wakeup type is APM timer");
 411                         /* system should hibernate */
 412                         break;
 413                 }
 414         }
 415
 416         return 1;
 417 }
 418
 419 /* Freeze when invoked and thaw on cleanup */
 420 static int freeze_thaw_user_slice(const char **method) {
 421         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 422         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
 423         int r;
 424
 425         if (!method || !*method)
 426                 return 0;
 427
 428         r = bus_connect_system_systemd(&bus);
 429         if (r < 0)
 430                 return log_debug_errno(r, "Failed to open connection to systemd: %m");
 431
 432         (void) sd_bus_set_method_call_timeout(bus, FREEZE_TIMEOUT);
 433
 434         r = bus_call_method(bus, bus_systemd_mgr, *method, &error, NULL, "s", SPECIAL_USER_SLICE);
 435         if (r < 0)
 436                 return log_debug_errno(r, "Failed to execute operation: %s", bus_error_message(&error, r));
 437
 438         return 1;
 439 }
 440
 441 static int execute_s2h(const SleepConfig *sleep_config) {
 442         _unused_ _cleanup_(freeze_thaw_user_slice) const char *auto_method_thaw = "ThawUnit";
 443         int r;
 444
 445         assert(sleep_config);
 446
 447         r = freeze_thaw_user_slice(&(const char*) { "FreezeUnit" });
 448         if (r < 0)
 449                 log_debug_errno(r, "Failed to freeze unit user.slice, ignoring: %m");
 450
 451         /* Only check if we have automated battery alarms if HibernateDelaySec= is not set, as in that case
 452          * we'll busy poll for the configured interval instead */
 453         if (!timestamp_is_set(sleep_config->hibernate_delay_usec)) {
 454                 r = check_wakeup_type();
 455                 if (r < 0)
 456                         log_debug_errno(r, "Failed to check hardware wakeup type, ignoring: %m");
 457                 else {
 458                         r = battery_trip_point_alarm_exists();
 459                         if (r < 0)
 460                                 log_debug_errno(r, "Failed to check whether acpi_btp support is enabled or not, ignoring: %m");
 461                 }
 462         } else
 463                 r = 0;  /* Force fallback path */
 464
 465         if (r > 0) { /* If we have both wakeup alarms and battery trip point support, use them */
 466                 log_debug("Attempting to suspend...");
 467                 r = execute(sleep_config, SLEEP_SUSPEND, NULL);
 468                 if (r < 0)
 469                         return r;
 470
 471                 r = check_wakeup_type();
 472                 if (r < 0)
 473                         return log_debug_errno(r, "Failed to check hardware wakeup type: %m");
 474
 475                 if (r == 0)
 476                         /* For APM Timer wakeup, system should hibernate else wakeup */
 477                         return 0;
 478         } else {
 479                 r = custom_timer_suspend(sleep_config);
 480                 if (r < 0)
 481                         return log_debug_errno(r, "Suspend cycle with manual battery discharge rate estimation failed: %m");
 482                 if (r == 0)
 483                         /* manual wakeup */
 484                         return 0;
 485         }
 486         /* For above custom timer, if 1 is returned, system will directly hibernate */
 487
 488         log_debug("Attempting to hibernate");
 489         r = execute(sleep_config, SLEEP_HIBERNATE, NULL);
 490         if (r < 0) {
 491                 log_notice("Couldn't hibernate, will try to suspend again.");
 492
 493                 r = execute(sleep_config, SLEEP_SUSPEND, "suspend-after-failed-hibernate");
 494                 if (r < 0)
 495                         return r;
 496         }
 497
 498         return 0;
 499 }
 500
 501 static int help(void) {
 502         _cleanup_free_ char *link = NULL;
 503         int r;
 504
 505         r = terminal_urlify_man("systemd-suspend.service", "8", &link);
 506         if (r < 0)
 507                 return log_oom();
 508
 509         printf("%s COMMAND\n\n"
 510                "Suspend the system, hibernate the system, or both.\n\n"
 511                "  -h --help              Show this help and exit\n"
 512                "  --version              Print version string and exit\n"
 513                "\nCommands:\n"
 514                "  suspend                Suspend the system\n"
 515                "  hibernate              Hibernate the system\n"
 516                "  hybrid-sleep           Both hibernate and suspend the system\n"
 517                "  suspend-then-hibernate Initially suspend and then hibernate\n"
 518                "                         the system after a fixed period of time\n"
 519                "\nSee the %s for details.\n",
 520                program_invocation_short_name,
 521                link);
 522
 523         return 0;
 524 }
 525
 526 static int parse_argv(int argc, char *argv[]) {
 527         enum {
 528                 ARG_VERSION = 0x100,
 529         };
 530
 531         static const struct option options[] = {
 532                 { "help",         no_argument,       NULL, 'h'           },
 533                 { "version",      no_argument,       NULL, ARG_VERSION   },
 534                 {}
 535         };
 536
 537         int c;
 538
 539         assert(argc >= 0);
 540         assert(argv);
 541
 542         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 543                 switch (c) {
 544                 case 'h':
 545                         return help();
 546
 547                 case ARG_VERSION:
 548                         return version();
 549
 550                 case '?':
 551                         return -EINVAL;
 552
 553                 default:
 554                         assert_not_reached();
 555                 }
 556
 557         if (argc - optind != 1)
 558                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 559                                        "Usage: %s COMMAND",
 560                                        program_invocation_short_name);
 561
 562         arg_operation = sleep_operation_from_string(argv[optind]);
 563         if (arg_operation < 0)
 564                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown command '%s'.", argv[optind]);
 565
 566         return 1 /* work to do */;
 567 }
 568
 569 static int run(int argc, char *argv[]) {
 570         _cleanup_(free_sleep_configp) SleepConfig *sleep_config = NULL;
 571         int r;
 572
 573         log_setup();
 574
 575         r = parse_argv(argc, argv);
 576         if (r <= 0)
 577                 return r;
 578
 579         r = parse_sleep_config(&sleep_config);
 580         if (r < 0)
 581                 return r;
 582
 583         if (!sleep_config->allow[arg_operation])
 584                 return log_error_errno(SYNTHETIC_ERRNO(EACCES),
 585                                        "Sleep operation \"%s\" is disabled by configuration, refusing.",
 586                                        sleep_operation_to_string(arg_operation));
 587
 588         switch (arg_operation) {
 589
 590         case SLEEP_SUSPEND_THEN_HIBERNATE:
 591                 r = execute_s2h(sleep_config);
 592                 break;
 593
 594         case SLEEP_HYBRID_SLEEP:
 595                 r = execute(sleep_config, SLEEP_HYBRID_SLEEP, NULL);
 596                 if (r < 0) {
 597                         /* If we can't hybrid sleep, then let's try to suspend at least. After all, the user
 598                          * asked us to do both: suspend + hibernate, and it's almost certainly the
 599                          * hibernation that failed, hence still do the other thing, the suspend. */
 600
 601                         log_notice("Couldn't hybrid sleep, will try to suspend instead.");
 602
 603                         r = execute(sleep_config, SLEEP_SUSPEND, "suspend-after-failed-hybrid-sleep");
 604                 }
 605
 606                 break;
 607
 608         default:
 609                 r = execute(sleep_config, arg_operation, NULL);
 610                 break;
 611         }
 612
 613         return r;
 614 }
 615
 616 DEFINE_MAIN_FUNCTION(run);