diff options
Diffstat (limited to 'src/sleep')
| -rw-r--r-- | src/sleep/sleep.c | 393 | ||||
| -rw-r--r-- | src/sleep/sleep.conf | 25 |
2 files changed, 418 insertions, 0 deletions
diff --git a/src/sleep/sleep.c b/src/sleep/sleep.c new file mode 100644 index 0000000..39ab554 --- /dev/null +++ b/src/sleep/sleep.c @@ -0,0 +1,393 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +/*** + Copyright © 2010-2017 Canonical + Copyright © 2018 Dell Inc. +***/ + +#include <errno.h> +#include <fcntl.h> +#include <getopt.h> +#include <linux/fiemap.h> +#include <poll.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <sys/timerfd.h> +#include <unistd.h> + +#include "sd-messages.h" + +#include "btrfs-util.h" +#include "bus-error.h" +#include "def.h" +#include "exec-util.h" +#include "fd-util.h" +#include "fileio.h" +#include "format-util.h" +#include "io-util.h" +#include "log.h" +#include "main-func.h" +#include "parse-util.h" +#include "pretty-print.h" +#include "sleep-config.h" +#include "stdio-util.h" +#include "string-util.h" +#include "strv.h" +#include "time-util.h" +#include "util.h" + +static char* arg_verb = NULL; + +STATIC_DESTRUCTOR_REGISTER(arg_verb, freep); + +static int write_hibernate_location_info(const HibernateLocation *hibernate_location) { + char offset_str[DECIMAL_STR_MAX(uint64_t)]; + char resume_str[DECIMAL_STR_MAX(unsigned) * 2 + STRLEN(":")]; + int r; + + assert(hibernate_location); + assert(hibernate_location->swap); + + xsprintf(resume_str, "%u:%u", major(hibernate_location->devno), minor(hibernate_location->devno)); + r = write_string_file("/sys/power/resume", resume_str, WRITE_STRING_FILE_DISABLE_BUFFER); + if (r < 0) + return log_debug_errno(r, "Failed to write partition device to /sys/power/resume for '%s': '%s': %m", + hibernate_location->swap->device, resume_str); + + log_debug("Wrote resume= value for %s to /sys/power/resume: %s", hibernate_location->swap->device, resume_str); + + /* if it's a swap partition, we're done */ + if (streq(hibernate_location->swap->type, "partition")) + return r; + + if (!streq(hibernate_location->swap->type, "file")) + return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), + "Invalid hibernate type: %s", hibernate_location->swap->type); + + /* Only available in 4.17+ */ + if (hibernate_location->offset > 0 && access("/sys/power/resume_offset", W_OK) < 0) { + if (errno == ENOENT) { + log_debug("Kernel too old, can't configure resume_offset for %s, ignoring: %" PRIu64, + hibernate_location->swap->device, hibernate_location->offset); + return 0; + } + + return log_debug_errno(errno, "/sys/power/resume_offset not writable: %m"); + } + + xsprintf(offset_str, "%" PRIu64, hibernate_location->offset); + r = write_string_file("/sys/power/resume_offset", offset_str, WRITE_STRING_FILE_DISABLE_BUFFER); + if (r < 0) + return log_debug_errno(r, "Failed to write swap file offset to /sys/power/resume_offset for '%s': '%s': %m", + hibernate_location->swap->device, offset_str); + + log_debug("Wrote resume_offset= value for %s to /sys/power/resume_offset: %s", hibernate_location->swap->device, offset_str); + + return 0; +} + +static int write_mode(char **modes) { + int r = 0; + char **mode; + + STRV_FOREACH(mode, modes) { + int k; + + k = write_string_file("/sys/power/disk", *mode, WRITE_STRING_FILE_DISABLE_BUFFER); + if (k >= 0) + return 0; + + log_debug_errno(k, "Failed to write '%s' to /sys/power/disk: %m", *mode); + if (r >= 0) + r = k; + } + + return r; +} + +static int write_state(FILE **f, char **states) { + char **state; + int r = 0; + + assert(f); + assert(*f); + + STRV_FOREACH(state, states) { + int k; + + k = write_string_stream(*f, *state, WRITE_STRING_FILE_DISABLE_BUFFER); + if (k >= 0) + return 0; + log_debug_errno(k, "Failed to write '%s' to /sys/power/state: %m", *state); + if (r >= 0) + r = k; + + fclose(*f); + *f = fopen("/sys/power/state", "we"); + if (!*f) + return -errno; + } + + return r; +} + +static int lock_all_homes(void) { + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL; + _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; + int r; + + /* Let's synchronously lock all home directories managed by homed that have been marked for it. This + * way the key material required to access these volumes is hopefully removed from memory. */ + + r = sd_bus_open_system(&bus); + if (r < 0) + return log_warning_errno(r, "Failed to connect to system bus, ignoring: %m"); + + r = sd_bus_message_new_method_call( + bus, + &m, + "org.freedesktop.home1", + "/org/freedesktop/home1", + "org.freedesktop.home1.Manager", + "LockAllHomes"); + if (r < 0) + return bus_log_create_error(r); + + /* If homed is not running it can't have any home directories active either. */ + r = sd_bus_message_set_auto_start(m, false); + if (r < 0) + return log_error_errno(r, "Failed to disable auto-start of LockAllHomes() message: %m"); + + r = sd_bus_call(bus, m, DEFAULT_TIMEOUT_USEC, &error, NULL); + if (r < 0) { + if (!bus_error_is_unknown_service(&error)) + return log_error_errno(r, "Failed to lock home directories: %s", bus_error_message(&error, r)); + + return log_debug("systemd-homed is not running, locking of home directories skipped."); + } + + return log_debug("Successfully requested locking of all home directories."); +} + +static int execute(char **modes, char **states) { + char *arguments[] = { + NULL, + (char*) "pre", + arg_verb, + NULL + }; + static const char* const dirs[] = { + SYSTEM_SLEEP_PATH, + NULL + }; + + _cleanup_fclose_ FILE *f = NULL; + _cleanup_(hibernate_location_freep) HibernateLocation *hibernate_location = NULL; + int r; + + /* This file is opened first, so that if we hit an error, + * we can abort before modifying any state. */ + f = fopen("/sys/power/state", "we"); + if (!f) + return log_error_errno(errno, "Failed to open /sys/power/state: %m"); + + setvbuf(f, NULL, _IONBF, 0); + + /* Configure hibernation settings if we are supposed to hibernate */ + if (!strv_isempty(modes)) { + r = find_hibernate_location(&hibernate_location); + if (r < 0) + return log_error_errno(r, "Failed to find location to hibernate to: %m"); + if (r == 0) { /* 0 means: no hibernation location was configured in the kernel so far, let's + * do it ourselves then. > 0 means: kernel already had a configured hibernation + * location which we shouldn't touch. */ + r = write_hibernate_location_info(hibernate_location); + if (r < 0) + return log_error_errno(r, "Failed to prepare for hibernation: %m"); + } + + r = write_mode(modes); + if (r < 0) + return log_error_errno(r, "Failed to write mode to /sys/power/disk: %m");; + } + + (void) execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments, NULL, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS); + (void) lock_all_homes(); + + log_struct(LOG_INFO, + "MESSAGE_ID=" SD_MESSAGE_SLEEP_START_STR, + LOG_MESSAGE("Suspending system..."), + "SLEEP=%s", arg_verb); + + r = write_state(&f, states); + if (r < 0) + log_struct_errno(LOG_ERR, r, + "MESSAGE_ID=" SD_MESSAGE_SLEEP_STOP_STR, + LOG_MESSAGE("Failed to suspend system. System resumed again: %m"), + "SLEEP=%s", arg_verb); + else + log_struct(LOG_INFO, + "MESSAGE_ID=" SD_MESSAGE_SLEEP_STOP_STR, + LOG_MESSAGE("System resumed."), + "SLEEP=%s", arg_verb); + + arguments[1] = (char*) "post"; + (void) execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments, NULL, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS); + + return r; +} + +static int execute_s2h(const SleepConfig *sleep_config) { + _cleanup_close_ int tfd = -1; + char buf[FORMAT_TIMESPAN_MAX]; + struct itimerspec ts = {}; + int r; + + assert(sleep_config); + + tfd = timerfd_create(CLOCK_BOOTTIME_ALARM, TFD_NONBLOCK|TFD_CLOEXEC); + if (tfd < 0) + return log_error_errno(errno, "Error creating timerfd: %m"); + + log_debug("Set timerfd wake alarm for %s", + format_timespan(buf, sizeof(buf), sleep_config->hibernate_delay_sec, USEC_PER_SEC)); + + timespec_store(&ts.it_value, sleep_config->hibernate_delay_sec); + + r = timerfd_settime(tfd, 0, &ts, NULL); + if (r < 0) + return log_error_errno(errno, "Error setting hibernate timer: %m"); + + r = execute(sleep_config->suspend_modes, sleep_config->suspend_states); + if (r < 0) + return r; + + r = fd_wait_for_event(tfd, POLLIN, 0); + if (r < 0) + return log_error_errno(r, "Error polling timerfd: %m"); + if (!FLAGS_SET(r, POLLIN)) /* We woke up before the alarm time, we are done. */ + return 0; + + tfd = safe_close(tfd); + + /* If woken up after alarm time, hibernate */ + log_debug("Attempting to hibernate after waking from %s timer", + format_timespan(buf, sizeof(buf), sleep_config->hibernate_delay_sec, USEC_PER_SEC)); + + r = execute(sleep_config->hibernate_modes, sleep_config->hibernate_states); + if (r < 0) { + log_notice_errno(r, "Couldn't hibernate, will try to suspend again: %m"); + + r = execute(sleep_config->suspend_modes, sleep_config->suspend_states); + if (r < 0) + return log_error_errno(r, "Could neither hibernate nor suspend, giving up: %m"); + } + + return 0; +} + +static int help(void) { + _cleanup_free_ char *link = NULL; + int r; + + r = terminal_urlify_man("systemd-suspend.service", "8", &link); + if (r < 0) + return log_oom(); + + printf("%s COMMAND\n\n" + "Suspend the system, hibernate the system, or both.\n\n" + " -h --help Show this help and exit\n" + " --version Print version string and exit\n" + "\nCommands:\n" + " suspend Suspend the system\n" + " hibernate Hibernate the system\n" + " hybrid-sleep Both hibernate and suspend the system\n" + " suspend-then-hibernate Initially suspend and then hibernate\n" + " the system after a fixed period of time\n" + "\nSee the %s for details.\n" + , program_invocation_short_name + , link + ); + + return 0; +} + +static int parse_argv(int argc, char *argv[]) { + enum { + ARG_VERSION = 0x100, + }; + + static const struct option options[] = { + { "help", no_argument, NULL, 'h' }, + { "version", no_argument, NULL, ARG_VERSION }, + {} + }; + + int c; + + assert(argc >= 0); + assert(argv); + + while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) + switch(c) { + case 'h': + return help(); + + case ARG_VERSION: + return version(); + + case '?': + return -EINVAL; + + default: + assert_not_reached("Unhandled option"); + } + + if (argc - optind != 1) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Usage: %s COMMAND", + program_invocation_short_name); + + arg_verb = strdup(argv[optind]); + if (!arg_verb) + return log_oom(); + + if (!STR_IN_SET(arg_verb, "suspend", "hibernate", "hybrid-sleep", "suspend-then-hibernate")) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Unknown command '%s'.", arg_verb); + + return 1 /* work to do */; +} + +static int run(int argc, char *argv[]) { + bool allow; + char **modes = NULL, **states = NULL; + _cleanup_(free_sleep_configp) SleepConfig *sleep_config = NULL; + int r; + + log_setup_service(); + + r = parse_argv(argc, argv); + if (r <= 0) + return r; + + r = parse_sleep_config(&sleep_config); + if (r < 0) + return r; + + r = sleep_settings(arg_verb, sleep_config, &allow, &modes, &states); + if (r < 0) + return r; + + if (!allow) + return log_error_errno(SYNTHETIC_ERRNO(EACCES), + "Sleep mode \"%s\" is disabled by configuration, refusing.", + arg_verb); + + if (streq(arg_verb, "suspend-then-hibernate")) + return execute_s2h(sleep_config); + else + return execute(modes, states); +} + +DEFINE_MAIN_FUNCTION(run); diff --git a/src/sleep/sleep.conf b/src/sleep/sleep.conf new file mode 100644 index 0000000..dc2ed37 --- /dev/null +++ b/src/sleep/sleep.conf @@ -0,0 +1,25 @@ +# This file is part of systemd. +# +# systemd is free software; you can redistribute it and/or modify it +# under the terms of the GNU Lesser General Public License as published by +# the Free Software Foundation; either version 2.1 of the License, or +# (at your option) any later version. +# +# Entries in this file show the compile time defaults. +# You can change settings by editing this file. +# Defaults can be restored by simply deleting this file. +# +# See systemd-sleep.conf(5) for details + +[Sleep] +#AllowSuspend=yes +#AllowHibernation=yes +#AllowSuspendThenHibernate=yes +#AllowHybridSleep=yes +#SuspendMode= +#SuspendState=mem standby freeze +#HibernateMode=platform shutdown +#HibernateState=disk +#HybridSleepMode=suspend platform shutdown +#HybridSleepState=disk +#HibernateDelaySec=180min |