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1/* SPDX-License-Identifier: LGPL-2.1-or-later */
2/***
3 Copyright © 2010-2017 Canonical
4 Copyright © 2018 Dell Inc.
5***/
6
7#include <fcntl.h>
8#include <getopt.h>
9#include <poll.h>
10#include <stdlib.h>
11#include <sys/timerfd.h>
12#include <sys/utsname.h>
13
14#include "sd-bus.h"
15#include "sd-device.h"
16#include "sd-id128.h"
17#include "sd-json.h"
18#include "sd-messages.h"
19
20#include "alloc-util.h"
21#include "battery-capacity.h"
22#include "battery-util.h"
23#include "blockdev-util.h"
24#include "build.h"
25#include "bus-error.h"
26#include "bus-locator.h"
27#include "bus-unit-util.h"
28#include "bus-util.h"
29#include "constants.h"
30#include "efivars.h"
31#include "env-util.h"
32#include "errno-util.h"
33#include "exec-util.h"
34#include "fd-util.h"
35#include "fileio.h"
36#include "hibernate-util.h"
37#include "io-util.h"
38#include "log.h"
39#include "main-func.h"
40#include "os-util.h"
41#include "pretty-print.h"
42#include "sleep-config.h"
43#include "special.h"
44#include "strv.h"
45#include "time-util.h"
46
47#define DEFAULT_HIBERNATE_DELAY_USEC_NO_BATTERY (2 * USEC_PER_HOUR)
48
49static SleepOperation arg_operation = _SLEEP_OPERATION_INVALID;
50
51#if ENABLE_EFI
52static int determine_auto_swap(sd_device *device) {
53 _cleanup_(sd_device_unrefp) sd_device *origin = NULL;
54 const char *part_designator;
55 int r;
56
57 /* Check if the selected hibernation device is the "auto" one. Specifically, trace to the partition
58 * block device and check if ID_DISSECT_PART_DESIGNATOR property is set to "swap" by udev
59 * dissect_image builtin. Later hibernate-resume-generator will generate cryptsetup unit based on
60 * this info. */
61
62 assert(device);
63
64 r = block_device_get_originating(device, &origin);
65 if (r < 0 && r != -ENOENT)
66 return r;
67 if (r >= 0)
68 device = origin;
69
70 r = sd_device_get_property_value(device, "ID_DISSECT_PART_DESIGNATOR", &part_designator);
71 if (r == -ENOENT)
72 return false;
73 if (r < 0)
74 return r;
75
76 return streq(part_designator, "swap");
77}
78#endif
79
80static int write_efi_hibernate_location(const HibernationDevice *hibernation_device, bool required) {
81 int log_level = required ? LOG_ERR : LOG_DEBUG;
82
83#if ENABLE_EFI
84 _cleanup_(sd_json_variant_unrefp) sd_json_variant *v = NULL;
85 _cleanup_free_ char *formatted = NULL, *id = NULL, *image_id = NULL,
86 *version_id = NULL, *image_version = NULL;
87 _cleanup_(sd_device_unrefp) sd_device *device = NULL;
88 const char *uuid_str;
89 sd_id128_t uuid;
90 struct utsname uts = {};
91 int r, auto_swap, log_level_ignore = required ? LOG_WARNING : LOG_DEBUG;
92
93 assert(hibernation_device);
94
95 if (!is_efi_boot())
96 return log_full_errno(log_level, SYNTHETIC_ERRNO(EOPNOTSUPP),
97 "Not an EFI boot, passing HibernateLocation via EFI variable is not possible.");
98
99 r = sd_device_new_from_devnum(&device, 'b', hibernation_device->devno);
100 if (r < 0)
101 return log_full_errno(log_level, r, "Failed to create sd-device object for '%s': %m",
102 hibernation_device->path);
103
104 r = sd_device_get_property_value(device, "ID_FS_UUID", &uuid_str);
105 if (r < 0)
106 return log_full_errno(log_level, r, "Failed to get filesystem UUID for device '%s': %m",
107 hibernation_device->path);
108
109 r = sd_id128_from_string(uuid_str, &uuid);
110 if (r < 0)
111 return log_full_errno(log_level, r, "Failed to parse ID_FS_UUID '%s' for device '%s': %m",
112 uuid_str, hibernation_device->path);
113
114 auto_swap = determine_auto_swap(device);
115 if (auto_swap < 0)
116 log_full_errno(log_level_ignore, auto_swap,
117 "Failed to get partition designator of '%s', ignoring: %m", hibernation_device->path);
118
119 if (uname(&uts) < 0)
120 log_full_errno(log_level_ignore, errno, "Failed to get kernel info, ignoring: %m");
121
122 r = parse_os_release(NULL,
123 "ID", &id,
124 "IMAGE_ID", &image_id,
125 "VERSION_ID", &version_id,
126 "IMAGE_VERSION", &image_version);
127 if (r < 0)
128 log_full_errno(log_level_ignore, r, "Failed to parse os-release, ignoring: %m");
129
130 r = sd_json_buildo(
131 &v,
132 SD_JSON_BUILD_PAIR_UUID("uuid", uuid),
133 SD_JSON_BUILD_PAIR_UNSIGNED("offset", hibernation_device->offset),
134 SD_JSON_BUILD_PAIR_CONDITION(auto_swap >= 0, "autoSwap", SD_JSON_BUILD_BOOLEAN(auto_swap)),
135 SD_JSON_BUILD_PAIR_CONDITION(!isempty(uts.release), "kernelVersion", SD_JSON_BUILD_STRING(uts.release)),
136 SD_JSON_BUILD_PAIR_CONDITION(!!id, "osReleaseId", SD_JSON_BUILD_STRING(id)),
137 SD_JSON_BUILD_PAIR_CONDITION(!!image_id, "osReleaseImageId", SD_JSON_BUILD_STRING(image_id)),
138 SD_JSON_BUILD_PAIR_CONDITION(!!version_id, "osReleaseVersionId", SD_JSON_BUILD_STRING(version_id)),
139 SD_JSON_BUILD_PAIR_CONDITION(!!image_version, "osReleaseImageVersion", SD_JSON_BUILD_STRING(image_version)));
140 if (r < 0)
141 return log_full_errno(log_level, r, "Failed to build JSON object: %m");
142
143 r = sd_json_variant_format(v, 0, &formatted);
144 if (r < 0)
145 return log_full_errno(log_level, r, "Failed to format JSON object: %m");
146
147 r = efi_set_variable_string(EFI_SYSTEMD_VARIABLE_STR("HibernateLocation"), formatted);
148 if (r < 0)
149 return log_full_errno(log_level, r, "Failed to set EFI variable HibernateLocation: %m");
150
151 log_debug("Set EFI variable HibernateLocation to '%s'.", formatted);
152 return 0;
153#else
154 return log_full_errno(log_level, SYNTHETIC_ERRNO(EOPNOTSUPP),
155 "EFI support not enabled, passing HibernateLocation via EFI variable is not possible.");
156#endif
157}
158
159static int write_state(int fd, char * const *states) {
160 int r = 0;
161
162 assert(fd >= 0);
163 assert(states);
164
165 STRV_FOREACH(state, states) {
166 _cleanup_fclose_ FILE *f = NULL;
167 int k;
168
169 k = fdopen_independent(fd, "we", &f);
170 if (k < 0)
171 return RET_GATHER(r, k);
172
173 k = write_string_stream(f, *state, WRITE_STRING_FILE_DISABLE_BUFFER);
174 if (k >= 0) {
175 log_debug("Using sleep state '%s'.", *state);
176 return 0;
177 }
178
179 RET_GATHER(r, log_debug_errno(k, "Failed to write '%s' to /sys/power/state: %m", *state));
180 }
181
182 return r;
183}
184
185static int write_mode(const char *path, char * const *modes) {
186 int r, ret = 0;
187
188 assert(path);
189
190 STRV_FOREACH(mode, modes) {
191 r = write_string_file(path, *mode, WRITE_STRING_FILE_DISABLE_BUFFER);
192 if (r >= 0) {
193 log_debug("Using sleep mode '%s' for %s.", *mode, path);
194 return 0;
195 }
196
197 RET_GATHER(ret, log_debug_errno(r, "Failed to write '%s' to %s: %m", *mode, path));
198 }
199
200 return ret;
201}
202
203static int lock_all_homes(void) {
204 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
205 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
206 _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
207 int r;
208
209 /* Let's synchronously lock all home directories managed by homed that have been marked for it. This
210 * way the key material required to access these volumes is hopefully removed from memory. */
211
212 r = sd_bus_open_system(&bus);
213 if (r < 0)
214 return log_error_errno(r, "Failed to connect to system bus: %m");
215
216 r = bus_message_new_method_call(bus, &m, bus_home_mgr, "LockAllHomes");
217 if (r < 0)
218 return bus_log_create_error(r);
219
220 /* If homed is not running it can't have any home directories active either. */
221 r = sd_bus_message_set_auto_start(m, false);
222 if (r < 0)
223 return log_error_errno(r, "Failed to disable auto-start of LockAllHomes() message: %m");
224
225 r = sd_bus_call(bus, m, DEFAULT_TIMEOUT_USEC, &error, NULL);
226 if (r < 0) {
227 if (!bus_error_is_unknown_service(&error))
228 return log_error_errno(r, "Failed to lock home directories: %s", bus_error_message(&error, r));
229
230 log_debug("systemd-homed is not running, locking of home directories skipped.");
231 } else
232 log_debug("Successfully requested locking of all home directories.");
233 return 0;
234}
235
236static int execute(
237 const SleepConfig *sleep_config,
238 SleepOperation operation,
239 const char *action) {
240
241 const char *arguments[] = {
242 NULL,
243 "pre",
244 /* NB: we use 'arg_operation' instead of 'operation' here, as we want to communicate the overall
245 * operation here, not the specific one, in case of s2h. */
246 sleep_operation_to_string(arg_operation),
247 NULL
248 };
249 static const char* const dirs[] = {
250 SYSTEM_SLEEP_PATH,
251 NULL
252 };
253
254 _cleanup_close_ int state_fd = -EBADF;
255 int r;
256
257 assert(sleep_config);
258 assert(operation >= 0);
259 assert(operation < _SLEEP_OPERATION_CONFIG_MAX); /* Others are handled by execute_s2h() instead */
260
261 if (strv_isempty(sleep_config->states[operation]))
262 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
263 "No sleep states configured for sleep operation %s, can't sleep.",
264 sleep_operation_to_string(operation));
265
266 /* This file is opened first, so that if we hit an error, we can abort before modifying any state. */
267 state_fd = open("/sys/power/state", O_WRONLY|O_CLOEXEC);
268 if (state_fd < 0)
269 return log_error_errno(errno, "Failed to open %s: %m", "/sys/power/state");
270
271 if (sleep_needs_mem_sleep(sleep_config, operation)) {
272 r = write_mode("/sys/power/mem_sleep", sleep_config->mem_modes);
273 if (r < 0)
274 return log_error_errno(r, "Failed to write mode to /sys/power/mem_sleep: %m");
275 }
276
277 /* Configure hibernation settings if we are supposed to hibernate */
278 if (SLEEP_OPERATION_IS_HIBERNATION(operation)) {
279 _cleanup_(hibernation_device_done) HibernationDevice hibernation_device = {};
280 bool resume_set;
281
282 r = find_suitable_hibernation_device(&hibernation_device);
283 if (r < 0)
284 return log_error_errno(r, "Failed to find location to hibernate to: %m");
285 resume_set = r > 0;
286
287 r = write_efi_hibernate_location(&hibernation_device, !resume_set);
288 if (!resume_set) {
289 if (r == -EOPNOTSUPP)
290 return log_error_errno(r, "No valid 'resume=' option found, refusing to hibernate.");
291 if (r < 0)
292 return r;
293
294 r = write_resume_config(hibernation_device.devno, hibernation_device.offset, hibernation_device.path);
295 if (r < 0)
296 goto fail;
297 }
298
299 r = write_mode("/sys/power/disk", sleep_config->modes[operation]);
300 if (r < 0) {
301 log_error_errno(r, "Failed to write mode to /sys/power/disk: %m");
302 goto fail;
303 }
304 }
305
306 /* Pass an action string to the call-outs. This is mostly our operation string, except if the
307 * hibernate step of s-t-h fails, in which case we communicate that with a separate action. */
308 if (!action)
309 action = sleep_operation_to_string(operation);
310
311 if (setenv("SYSTEMD_SLEEP_ACTION", action, /* overwrite = */ 1) < 0)
312 log_warning_errno(errno, "Failed to set SYSTEMD_SLEEP_ACTION=%s, ignoring: %m", action);
313
314 (void) execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, (char **) arguments, NULL, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS);
315 (void) lock_all_homes();
316
317 log_struct(LOG_INFO,
318 LOG_MESSAGE_ID(SD_MESSAGE_SLEEP_START_STR),
319 LOG_MESSAGE("Performing sleep operation '%s'...", sleep_operation_to_string(operation)),
320 LOG_ITEM("SLEEP=%s", sleep_operation_to_string(arg_operation)));
321
322 r = write_state(state_fd, sleep_config->states[operation]);
323 if (r < 0)
324 log_struct_errno(LOG_ERR, r,
325 LOG_MESSAGE_ID(SD_MESSAGE_SLEEP_STOP_STR),
326 LOG_MESSAGE("Failed to put system to sleep. System resumed again: %m"),
327 LOG_ITEM("SLEEP=%s", sleep_operation_to_string(arg_operation)));
328 else
329 log_struct(LOG_INFO,
330 LOG_MESSAGE_ID(SD_MESSAGE_SLEEP_STOP_STR),
331 LOG_MESSAGE("System returned from sleep operation '%s'.", sleep_operation_to_string(arg_operation)),
332 LOG_ITEM("SLEEP=%s", sleep_operation_to_string(arg_operation)));
333
334 arguments[1] = "post";
335 (void) execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, (char **) arguments, NULL, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS);
336
337 if (r >= 0)
338 return 0;
339
340fail:
341 if (SLEEP_OPERATION_IS_HIBERNATION(operation))
342 (void) clear_efi_hibernate_location_and_warn();
343
344 return r;
345}
346
347/* Return true if wakeup type is APM timer */
348static int check_wakeup_type(void) {
349 static const char dmi_object_path[] = "/sys/firmware/dmi/entries/1-0/raw";
350 uint8_t wakeup_type_byte, tablesize;
351 _cleanup_free_ char *buf = NULL;
352 size_t bufsize;
353 int r;
354
355 /* implementation via dmi/entries */
356 r = read_full_virtual_file(dmi_object_path, &buf, &bufsize);
357 if (r < 0)
358 return log_debug_errno(r, "Unable to read %s: %m", dmi_object_path);
359 if (bufsize < 25)
360 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
361 "Only read %zu bytes from %s (expected 25)",
362 bufsize, dmi_object_path);
363
364 /* index 1 stores the size of table */
365 tablesize = (uint8_t) buf[1];
366 if (tablesize < 25)
367 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
368 "Table size less than the index[0x18] where waketype byte is available.");
369
370 wakeup_type_byte = (uint8_t) buf[24];
371 /* 0 is Reserved and 8 is AC Power Restored. As per table 12 in
372 * https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.4.0.pdf */
373 if (wakeup_type_byte >= 128)
374 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Expected value in range 0-127");
375
376 if (wakeup_type_byte == 3) {
377 log_debug("DMI BIOS System Information indicates wakeup type is APM Timer");
378 return true;
379 }
380
381 return false;
382}
383
384static int custom_timer_suspend(const SleepConfig *sleep_config) {
385 usec_t hibernate_timestamp;
386 int r;
387
388 assert(sleep_config);
389
390 hibernate_timestamp = usec_add(now(CLOCK_BOOTTIME), sleep_config->hibernate_delay_usec);
391
392 while (battery_is_discharging_and_low() == 0) {
393 _cleanup_hashmap_free_ Hashmap *last_capacity = NULL, *current_capacity = NULL;
394 _cleanup_close_ int tfd = -EBADF;
395 struct itimerspec ts = {};
396 usec_t suspend_interval;
397 bool woken_by_timer;
398
399 tfd = timerfd_create(CLOCK_BOOTTIME_ALARM, TFD_NONBLOCK|TFD_CLOEXEC);
400 if (tfd < 0)
401 return log_error_errno(errno, "Error creating timerfd: %m");
402
403 /* Store current battery capacity before suspension */
404 r = fetch_batteries_capacity_by_name(&last_capacity);
405 if (r < 0)
406 return log_error_errno(r, "Error fetching battery capacity percentage: %m");
407
408 if (hashmap_isempty(last_capacity))
409 /* In case of no battery, system suspend interval will be set to HibernateDelaySec= or 2 hours. */
410 suspend_interval = timestamp_is_set(hibernate_timestamp)
411 ? sleep_config->hibernate_delay_usec : DEFAULT_HIBERNATE_DELAY_USEC_NO_BATTERY;
412 else {
413 r = get_total_suspend_interval(last_capacity, &suspend_interval);
414 if (r < 0) {
415 log_debug_errno(r, "Failed to estimate suspend interval using previous discharge rate, ignoring: %m");
416 /* In case of any errors, especially when we do not know the battery
417 * discharging rate, system suspend interval will be set to
418 * SuspendEstimationSec=. */
419 suspend_interval = sleep_config->suspend_estimation_usec;
420 }
421 }
422
423 /* Do not suspend more than HibernateDelaySec= unless HibernateOnACPower=no and currently on AC power */
424 if (!sleep_config->hibernate_on_ac_power) {
425 /* Do not allow "decay" to suspend if the system has no battery. */
426 if (hashmap_isempty(last_capacity))
427 log_once(LOG_WARNING, "HibernateOnACPower=no was ignored because the system does not have a battery.");
428 else if (on_ac_power() > 0)
429 hibernate_timestamp = usec_add(now(CLOCK_BOOTTIME), sleep_config->hibernate_delay_usec);
430 }
431
432 usec_t before_timestamp = now(CLOCK_BOOTTIME);
433 suspend_interval = MIN(suspend_interval, usec_sub_unsigned(hibernate_timestamp, before_timestamp));
434 if (suspend_interval <= 0)
435 break; /* system should hibernate */
436
437 log_debug("Set timerfd wake alarm for %s", FORMAT_TIMESPAN(suspend_interval, USEC_PER_SEC));
438 /* Wake alarm for system with or without battery to hibernate or estimate discharge rate whichever is applicable */
439 timespec_store(&ts.it_value, suspend_interval);
440
441 if (timerfd_settime(tfd, 0, &ts, NULL) < 0)
442 return log_error_errno(errno, "Error setting battery estimate timer: %m");
443
444 r = execute(sleep_config, SLEEP_SUSPEND, NULL);
445 if (r < 0)
446 return r;
447
448 r = fd_wait_for_event(tfd, POLLIN, 0);
449 if (r < 0)
450 return log_error_errno(r, "Error polling timerfd: %m");
451 /* Store fd_wait status */
452 woken_by_timer = FLAGS_SET(r, POLLIN);
453
454 r = fetch_batteries_capacity_by_name(&current_capacity);
455 if (r < 0 || hashmap_isempty(current_capacity)) {
456 /* In case of no battery or error while getting charge level, no need to measure
457 * discharge rate. Instead the system should wake up if it is manual wakeup or
458 * hibernate if this is a timer wakeup. */
459 if (r < 0)
460 log_debug_errno(r, "Battery capacity percentage unavailable, cannot estimate discharge rate: %m");
461 else
462 log_debug("No battery found.");
463 if (!woken_by_timer)
464 return 0;
465 break;
466 }
467
468 usec_t after_timestamp = now(CLOCK_BOOTTIME);
469 log_debug("Attempting to estimate battery discharge rate after wakeup from %s sleep",
470 FORMAT_TIMESPAN(after_timestamp - before_timestamp, USEC_PER_HOUR));
471
472 if (after_timestamp != before_timestamp) {
473 r = estimate_battery_discharge_rate_per_hour(last_capacity, current_capacity, before_timestamp, after_timestamp);
474 if (r < 0)
475 log_warning_errno(r, "Failed to estimate and update battery discharge rate, ignoring: %m");
476 } else
477 log_debug("System woke up too early to estimate discharge rate.");
478
479 if (!woken_by_timer)
480 /* Return as manual wakeup done. This also will return in case battery was charged during suspension */
481 return 0;
482
483 r = check_wakeup_type();
484 if (r > 0) {
485 log_debug("wakeup type is APM timer");
486 /* system should hibernate */
487 break;
488 }
489 }
490
491 return 1;
492}
493
494static int execute_s2h(const SleepConfig *sleep_config) {
495 int r;
496
497 assert(sleep_config);
498
499 /* Only check if we have automated battery alarms if HibernateDelaySec= is not set, as in that case
500 * we'll busy poll for the configured interval instead */
501 if (!timestamp_is_set(sleep_config->hibernate_delay_usec)) {
502 r = check_wakeup_type();
503 if (r < 0)
504 log_warning_errno(r, "Failed to check hardware wakeup type, ignoring: %m");
505 else {
506 r = battery_trip_point_alarm_exists();
507 if (r < 0)
508 log_warning_errno(r, "Failed to check whether acpi_btp support is enabled or not, ignoring: %m");
509 }
510 } else
511 r = 0; /* Force fallback path */
512
513 if (r > 0) { /* If we have both wakeup alarms and battery trip point support, use them */
514 log_debug("Attempting to suspend...");
515 r = execute(sleep_config, SLEEP_SUSPEND, NULL);
516 if (r < 0)
517 return r;
518
519 r = check_wakeup_type();
520 if (r < 0)
521 return log_error_errno(r, "Failed to check hardware wakeup type: %m");
522
523 if (r == 0)
524 /* For APM Timer wakeup, system should hibernate else wakeup */
525 return 0;
526 } else {
527 r = custom_timer_suspend(sleep_config);
528 if (r < 0)
529 return log_debug_errno(r, "Suspend cycle with manual battery discharge rate estimation failed: %m");
530 if (r == 0)
531 /* manual wakeup */
532 return 0;
533 }
534 /* For above custom timer, if 1 is returned, system will directly hibernate */
535
536 log_debug("Attempting to hibernate");
537 r = execute(sleep_config, SLEEP_HIBERNATE, NULL);
538 if (r < 0) {
539 log_notice("Couldn't hibernate, will try to suspend again.");
540
541 r = execute(sleep_config, SLEEP_SUSPEND, "suspend-after-failed-hibernate");
542 if (r < 0)
543 return r;
544 }
545
546 return 0;
547}
548
549static int help(void) {
550 _cleanup_free_ char *link = NULL;
551 int r;
552
553 r = terminal_urlify_man("systemd-suspend.service", "8", &link);
554 if (r < 0)
555 return log_oom();
556
557 printf("%s COMMAND\n\n"
558 "Suspend the system, hibernate the system, or both.\n\n"
559 " -h --help Show this help and exit\n"
560 " --version Print version string and exit\n"
561 "\nCommands:\n"
562 " suspend Suspend the system\n"
563 " hibernate Hibernate the system\n"
564 " hybrid-sleep Both hibernate and suspend the system\n"
565 " suspend-then-hibernate Initially suspend and then hibernate\n"
566 " the system after a fixed period of time or\n"
567 " when battery is low\n"
568 "\nSee the %s for details.\n",
569 program_invocation_short_name,
570 link);
571
572 return 0;
573}
574
575static int parse_argv(int argc, char *argv[]) {
576
577 enum {
578 ARG_VERSION = 0x100,
579 };
580
581 static const struct option options[] = {
582 { "help", no_argument, NULL, 'h' },
583 { "version", no_argument, NULL, ARG_VERSION },
584 {}
585 };
586
587 int c;
588
589 assert(argc >= 0);
590 assert(argv);
591
592 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
593 switch (c) {
594
595 case 'h':
596 return help();
597
598 case ARG_VERSION:
599 return version();
600
601 case '?':
602 return -EINVAL;
603
604 default:
605 assert_not_reached();
606
607 }
608
609 if (argc - optind != 1)
610 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
611 "Usage: %s COMMAND",
612 program_invocation_short_name);
613
614 arg_operation = sleep_operation_from_string(argv[optind]);
615 if (arg_operation < 0)
616 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown command '%s'.", argv[optind]);
617
618 return 1 /* work to do */;
619}
620
621static int run(int argc, char *argv[]) {
622 _cleanup_(unit_freezer_freep) UnitFreezer *user_slice_freezer = NULL;
623 _cleanup_(sleep_config_freep) SleepConfig *sleep_config = NULL;
624 int r;
625
626 log_setup();
627
628 r = parse_argv(argc, argv);
629 if (r <= 0)
630 return r;
631
632 r = parse_sleep_config(&sleep_config);
633 if (r < 0)
634 return r;
635
636 if (!sleep_config->allow[arg_operation])
637 return log_error_errno(SYNTHETIC_ERRNO(EACCES),
638 "Sleep operation \"%s\" is disabled by configuration, refusing.",
639 sleep_operation_to_string(arg_operation));
640
641 /* Freeze the user sessions */
642 r = getenv_bool("SYSTEMD_SLEEP_FREEZE_USER_SESSIONS");
643 if (r < 0 && r != -ENXIO)
644 log_warning_errno(r, "Cannot parse value of $SYSTEMD_SLEEP_FREEZE_USER_SESSIONS, ignoring: %m");
645 if (r != 0) {
646 r = unit_freezer_new(SPECIAL_USER_SLICE, &user_slice_freezer);
647 if (r < 0)
648 return r;
649
650 (void) unit_freezer_freeze(user_slice_freezer);
651 } else
652 log_notice("User sessions remain unfrozen on explicit request ($SYSTEMD_SLEEP_FREEZE_USER_SESSIONS=0).\n"
653 "This is not recommended, and might result in unexpected behavior, particularly\n"
654 "in suspend-then-hibernate operations or setups with encrypted home directories.");
655
656 switch (arg_operation) {
657
658 case SLEEP_SUSPEND_THEN_HIBERNATE:
659 r = execute_s2h(sleep_config);
660 break;
661
662 case SLEEP_HYBRID_SLEEP:
663 r = execute(sleep_config, SLEEP_HYBRID_SLEEP, NULL);
664 if (r < 0) {
665 /* If we can't hybrid sleep, then let's try to suspend at least. After all, the user
666 * asked us to do both: suspend + hibernate, and it's almost certainly the
667 * hibernation that failed, hence still do the other thing, the suspend. */
668
669 log_notice_errno(r, "Couldn't hybrid sleep, will try to suspend instead: %m");
670
671 r = execute(sleep_config, SLEEP_SUSPEND, "suspend-after-failed-hybrid-sleep");
672 }
673
674 break;
675
676 case SLEEP_SUSPEND:
677 case SLEEP_HIBERNATE:
678 r = execute(sleep_config, arg_operation, NULL);
679 break;
680
681 default:
682 assert_not_reached();
683 }
684
685 if (user_slice_freezer)
686 RET_GATHER(r, unit_freezer_thaw(user_slice_freezer));
687
688 return r;
689}
690
691DEFINE_MAIN_FUNCTION(run);
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