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shared/sleep-config: add switches to kill specific sleep modes

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/etc/systemd/sleep.conf gains four new switches:
AllowSuspend=, AllowHibernation=, AllowSuspendThenHibernate=, AllowHybridSleep=.

Disabling specific modes was already possible by masking suspend.target,
hibernate.target, suspend-then-hibernate.target, or hybrid-sleep.target.
But this is not convenient for distributions, which want to set some defaults
based on what they want to support. Having those available as configuration
makes it easy to put a config file in /usr/lib/systemd/sleep.conf.d/ that
overrides the defaults and gives instructions how to undo that override.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2018-09-26 11:17:36 +02:00
parent 5fdf2d51c2
commit e8f1d00d69
6 changed files with 86 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
TODO
View File

@ -87,9 +87,8 @@ Features:
1. add resume_offset support to the resume code (i.e. support swap files
properly)
2. check if swap is on weird storage and refuse if so
3. add env-var based option to disable hibernation
4. figure out what to do with swap-on-luks
5. add autodetection of hibernation images
3. figure out what to do with swap-on-luks
4. add autodetection of hibernation images
* portables: introduce a new unit file directory /etc/systemd/system.attached/
or so, where we attach portable services to

18
man/systemd-sleep.conf.xml
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@ -113,6 +113,24 @@
<filename>sleep.conf.d</filename> file:</para>
<variablelist class='systemd-directives'>
<varlistentry>
<term><varname>AllowSuspend=</varname></term>
<term><varname>AllowHibernation=</varname></term>
<term><varname>AllowSuspendThenHibernate=</varname></term>
<term><varname>AllowHybridSleep=</varname></term>
<listitem><para>By default any power-saving mode is advertised if possible (i.e.
the kernel supports that mode, the necessary resources are available). Those
switches can be used to disable specific modes.</para>
<para>If <varname>AllowHibernation=no</varname> or <varname>AllowSuspend=no</varname> is
used, this implies <varname>AllowSuspendThenHibernate=no</varname> and
<varname>AllowHybridSleep=no</varname>, since those methods use both suspend and hibernation
internally. <varname>AllowSuspendThenHibernate=yes</varname> and
<varname>AllowHybridSleep=yes</varname> can be used to override and enable those specific
modes.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>SuspendMode=</varname></term>
<term><varname>HibernateMode=</varname></term>

78
src/shared/sleep-config.c
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@ -31,8 +31,10 @@
#include "string-util.h"
#include "strv.h"
int parse_sleep_config(const char *verb, char ***_modes, char ***_states, usec_t *_delay) {
int parse_sleep_config(const char *verb, bool *ret_allow, char ***ret_modes, char ***ret_states, usec_t *ret_delay) {
int allow_suspend = -1, allow_hibernate = -1,
allow_s2h = -1, allow_hybrid_sleep = -1;
bool allow;
_cleanup_strv_free_ char
**suspend_mode = NULL, **suspend_state = NULL,
**hibernate_mode = NULL, **hibernate_state = NULL,
@ -41,13 +43,19 @@ int parse_sleep_config(const char *verb, char ***_modes, char ***_states, usec_t
usec_t delay = 180 * USEC_PER_MINUTE;
const ConfigTableItem items[] = {
{ "Sleep", "SuspendMode", config_parse_strv, 0, &suspend_mode },
{ "Sleep", "SuspendState", config_parse_strv, 0, &suspend_state },
{ "Sleep", "HibernateMode", config_parse_strv, 0, &hibernate_mode },
{ "Sleep", "HibernateState", config_parse_strv, 0, &hibernate_state },
{ "Sleep", "HybridSleepMode", config_parse_strv, 0, &hybrid_mode },
{ "Sleep", "HybridSleepState", config_parse_strv, 0, &hybrid_state },
{ "Sleep", "HibernateDelaySec", config_parse_sec, 0, &delay},
{ "Sleep", "AllowSuspend", config_parse_tristate, 0, &allow_suspend },
{ "Sleep", "AllowHibernation", config_parse_tristate, 0, &allow_hibernate },
{ "Sleep", "AllowSuspendThenHibernate", config_parse_tristate, 0, &allow_s2h },
{ "Sleep", "AllowHybridSleep", config_parse_tristate, 0, &allow_hybrid_sleep },
{ "Sleep", "SuspendMode", config_parse_strv, 0, &suspend_mode },
{ "Sleep", "SuspendState", config_parse_strv, 0, &suspend_state },
{ "Sleep", "HibernateMode", config_parse_strv, 0, &hibernate_mode },
{ "Sleep", "HibernateState", config_parse_strv, 0, &hibernate_state },
{ "Sleep", "HybridSleepMode", config_parse_strv, 0, &hybrid_mode },
{ "Sleep", "HybridSleepState", config_parse_strv, 0, &hybrid_state },
{ "Sleep", "HibernateDelaySec", config_parse_sec, 0, &delay},
{}
};
@ -57,6 +65,8 @@ int parse_sleep_config(const char *verb, char ***_modes, char ***_states, usec_t
CONFIG_PARSE_WARN, NULL);
if (streq(verb, "suspend")) {
allow = allow_suspend != 0;
/* empty by default */
modes = TAKE_PTR(suspend_mode);
@ -66,6 +76,8 @@ int parse_sleep_config(const char *verb, char ***_modes, char ***_states, usec_t
states = strv_new("mem", "standby", "freeze", NULL);
} else if (streq(verb, "hibernate")) {
allow = allow_hibernate != 0;
if (hibernate_mode)
modes = TAKE_PTR(hibernate_mode);
else
@ -77,6 +89,9 @@ int parse_sleep_config(const char *verb, char ***_modes, char ***_states, usec_t
states = strv_new("disk", NULL);
} else if (streq(verb, "hybrid-sleep")) {
allow = allow_hybrid_sleep > 0 ||
(allow_suspend != 0 && allow_hibernate != 0);
if (hybrid_mode)
modes = TAKE_PTR(hybrid_mode);
else
@ -87,21 +102,26 @@ int parse_sleep_config(const char *verb, char ***_modes, char ***_states, usec_t
else
states = strv_new("disk", NULL);
} else if (streq(verb, "suspend-then-hibernate"))
} else if (streq(verb, "suspend-then-hibernate")) {
allow = allow_s2h > 0 ||
(allow_suspend != 0 && allow_hibernate != 0);
modes = states = NULL;
else
} else
assert_not_reached("what verb");
if ((!modes && STR_IN_SET(verb, "hibernate", "hybrid-sleep")) ||
(!states && !streq(verb, "suspend-then-hibernate")))
return log_oom();
if (_modes)
*_modes = TAKE_PTR(modes);
if (_states)
*_states = TAKE_PTR(states);
if (_delay)
*_delay = delay;
if (ret_allow)
*ret_allow = allow;
if (ret_modes)
*ret_modes = TAKE_PTR(modes);
if (ret_states)
*ret_states = TAKE_PTR(states);
if (ret_delay)
*ret_delay = delay;
return 0;
}
@ -506,6 +526,8 @@ int read_fiemap(int fd, struct fiemap **ret) {
return 0;
}
static int can_sleep_internal(const char *verb, bool check_allowed);
static bool can_s2h(void) {
const char *p;
int r;
@ -518,7 +540,7 @@ static bool can_s2h(void) {
}
FOREACH_STRING(p, "suspend", "hibernate") {
r = can_sleep(p);
r = can_sleep_internal(p, false);
if (IN_SET(r, 0, -ENOSPC, -ENOMEDIUM, -EADV)) {
log_debug("Unable to %s system.", p);
return false;
@ -530,19 +552,25 @@ static bool can_s2h(void) {
return true;
}
int can_sleep(const char *verb) {
static int can_sleep_internal(const char *verb, bool check_allowed) {
bool allow;
_cleanup_strv_free_ char **modes = NULL, **states = NULL;
int r;
assert(STR_IN_SET(verb, "suspend", "hibernate", "hybrid-sleep", "suspend-then-hibernate"));
if (streq(verb, "suspend-then-hibernate"))
return can_s2h();
r = parse_sleep_config(verb, &modes, &states, NULL);
r = parse_sleep_config(verb, &allow, &modes, &states, NULL);
if (r < 0)
return false;
if (check_allowed && !allow) {
log_debug("Sleep mode \"%s\" is disabled by configuration.", verb);
return false;
}
if (streq(verb, "suspend-then-hibernate"))
return can_s2h();
if (!can_sleep_state(states) || !can_sleep_disk(modes))
return false;
@ -564,3 +592,7 @@ int can_sleep(const char *verb) {
return true;
}
int can_sleep(const char *verb) {
return can_sleep_internal(verb, true);
}

2
src/shared/sleep-config.h
View File

@ -5,7 +5,7 @@
#include "time-util.h"
int read_fiemap(int fd, struct fiemap **ret);
int parse_sleep_config(const char *verb, char ***modes, char ***states, usec_t *delay);
int parse_sleep_config(const char *verb, bool *ret_allow, char ***ret_modes, char ***ret_states, usec_t *ret_delay);
int find_hibernate_location(char **device, char **type, size_t *size, size_t *used);
int can_sleep(const char *verb);

15
src/sleep/sleep.c
View File

@ -136,7 +136,6 @@ static int write_state(FILE **f, char **states) {
}
static int execute(char **modes, char **states) {
char *arguments[] = {
NULL,
(char*) "pre",
@ -221,13 +220,11 @@ static int execute_s2h(usec_t hibernate_delay_sec) {
char time_str[DECIMAL_STR_MAX(uint64_t)];
int r;
r = parse_sleep_config("suspend", &suspend_modes, &suspend_states,
NULL);
r = parse_sleep_config("suspend", NULL, &suspend_modes, &suspend_states, NULL);
if (r < 0)
return r;
r = parse_sleep_config("hibernate", &hibernate_modes,
&hibernate_states, NULL);
r = parse_sleep_config("hibernate", NULL, &hibernate_modes, &hibernate_states, NULL);
if (r < 0)
return r;
@ -340,6 +337,7 @@ static int parse_argv(int argc, char *argv[]) {
}
int main(int argc, char *argv[]) {
bool allow;
_cleanup_strv_free_ char **modes = NULL, **states = NULL;
usec_t delay = 0;
int r;
@ -352,10 +350,15 @@ int main(int argc, char *argv[]) {
if (r <= 0)
goto finish;
r = parse_sleep_config(arg_verb, &modes, &states, &delay);
r = parse_sleep_config(arg_verb, &allow, &modes, &states, &delay);
if (r < 0)
goto finish;
if (!allow) {
log_error("Sleep mode \"%s\" is disabled by configuration, refusing.", arg_verb);
return EXIT_FAILURE;
}
if (streq(arg_verb, "suspend-then-hibernate"))
r = execute_s2h(delay);
else

2
src/test/test-sleep.c
View File

@ -17,7 +17,7 @@ static void test_parse_sleep_config(void) {
log_info("/* %s */", __func__);
FOREACH_STRING(verb, "suspend", "hibernate", "hybrid-sleep", "suspend-then-hibernate")
assert_se(parse_sleep_config(verb, NULL, NULL, NULL) == 0);
assert_se(parse_sleep_config(verb, NULL, NULL, NULL, NULL) == 0);
}
static int test_fiemap(const char *path) {