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Merge pull request #28104 from DaanDeMeyer/emergency-kexec-halt

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core: Add halt and kexec emergency actions
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Lennart Poettering 2023-06-22 16:07:35 +02:00 committed by GitHub
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6 changed files with 71 additions and 20 deletions
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26
man/systemd.unit.xml
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@ -1004,10 +1004,12 @@
inactive state. Takes one of <option>none</option>, <option>reboot</option>,
<option>reboot-force</option>, <option>reboot-immediate</option>, <option>poweroff</option>,
<option>poweroff-force</option>, <option>poweroff-immediate</option>, <option>exit</option>,
<option>exit-force</option>, <option>soft-reboot</option> and <option>soft-reboot-force</option>. In
system mode, all options are allowed. In user mode, only <option>none</option>,
<option>exit</option>, <option>exit-force</option>, <option>soft-reboot</option> and
<option>soft-reboot-force</option> are allowed. Both options default to <option>none</option>.</para>
<option>exit-force</option>, <option>soft-reboot</option>, <option>soft-reboot-force</option>,
<option>kexec</option>, <option>kexec-force</option>, <option>halt</option>,
<option>halt-force</option> and <option>halt-immediate</option>. In system mode, all options are
allowed. In user mode, only <option>none</option>, <option>exit</option>,
<option>exit-force</option>, <option>soft-reboot</option> and <option>soft-reboot-force</option> are
allowed. Both options default to <option>none</option>.</para>
<para>If <option>none</option> is set, no action will be triggered. <option>reboot</option> causes a
reboot following the normal shutdown procedure (i.e. equivalent to <command>systemctl
@ -1016,18 +1018,20 @@
<command>systemctl reboot -f</command>) and <option>reboot-immediate</option> causes immediate
execution of the
<citerefentry><refentrytitle>reboot</refentrytitle><manvolnum>2</manvolnum></citerefentry> system
call, which might result in data loss (i.e. equivalent to <command>systemctl reboot
-ff</command>). Similarly, <option>poweroff</option>, <option>poweroff-force</option>,
<option>poweroff-immediate</option> have the effect of powering down the system with similar
call, which might result in data loss (i.e. equivalent to <command>systemctl reboot -ff</command>).
Similarly, <option>poweroff</option>, <option>poweroff-force</option>,
<option>poweroff-immediate</option>, <option>kexec</option>, <option>kexec-force</option>,
<option>halt</option>, <option>halt-force</option> and <option>halt-immediate</option> have the
effect of powering down the system, executing kexec, and halting the system respectively with similar
semantics. <option>exit</option> causes the manager to exit following the normal shutdown procedure,
and <option>exit-force</option> causes it terminate without shutting down services. When
<option>exit</option> or <option>exit-force</option> is used by default the exit status of the main
process of the unit (if this applies) is returned from the service manager. However, this may be
overridden with
<varname>FailureActionExitStatus=</varname>/<varname>SuccessActionExitStatus=</varname>, see
below. <option>soft-reboot</option> will trigger a userspace reboot
operation. <option>soft-reboot-force</option> does that too, but does not go through the shutdown
transaction beforehand.</para></listitem>
<varname>FailureActionExitStatus=</varname>/<varname>SuccessActionExitStatus=</varname>, see below.
<option>soft-reboot</option> will trigger a userspace reboot operation.
<option>soft-reboot-force</option> does that too, but does not go through the shutdown transaction
beforehand.</para></listitem>
</varlistentry>
<varlistentry>

42
src/core/emergency-action.c
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@ -24,6 +24,11 @@ static const char* const emergency_action_table[_EMERGENCY_ACTION_MAX] = {
[EMERGENCY_ACTION_EXIT_FORCE] = "exit-force",
[EMERGENCY_ACTION_SOFT_REBOOT] = "soft-reboot",
[EMERGENCY_ACTION_SOFT_REBOOT_FORCE] = "soft-reboot-force",
[EMERGENCY_ACTION_KEXEC] = "kexec",
[EMERGENCY_ACTION_KEXEC_FORCE] = "kexec-force",
[EMERGENCY_ACTION_HALT] = "halt",
[EMERGENCY_ACTION_HALT_FORCE] = "halt-force",
[EMERGENCY_ACTION_HALT_IMMEDIATE] = "halt-immediate",
};
static void log_and_status(Manager *m, bool warn, const char *message, const char *reason) {
@ -49,7 +54,13 @@ void emergency_action(
assert(action < _EMERGENCY_ACTION_MAX);
/* Is the special shutdown target active or queued? If so, we are in shutdown state */
if (IN_SET(action, EMERGENCY_ACTION_REBOOT, EMERGENCY_ACTION_SOFT_REBOOT, EMERGENCY_ACTION_POWEROFF, EMERGENCY_ACTION_EXIT)) {
if (IN_SET(action,
EMERGENCY_ACTION_REBOOT,
EMERGENCY_ACTION_SOFT_REBOOT,
EMERGENCY_ACTION_POWEROFF,
EMERGENCY_ACTION_EXIT,
EMERGENCY_ACTION_KEXEC,
EMERGENCY_ACTION_HALT)) {
u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET);
if (u && unit_active_or_pending(u)) {
log_notice("Shutdown is already active. Skipping emergency action request %s.",
@ -158,6 +169,35 @@ void emergency_action(
(void) reboot(RB_POWER_OFF);
break;
case EMERGENCY_ACTION_KEXEC:
log_and_status(m, warn, "Executing kexec", reason);
(void) manager_add_job_by_name_and_warn(m, JOB_START, SPECIAL_KEXEC_TARGET, JOB_REPLACE_IRREVERSIBLY, NULL, NULL);
break;
case EMERGENCY_ACTION_KEXEC_FORCE:
log_and_status(m, warn, "Forcibly executing kexec", reason);
m->objective = MANAGER_KEXEC;
break;
case EMERGENCY_ACTION_HALT:
log_and_status(m, warn, "Halting", reason);
(void) manager_add_job_by_name_and_warn(m, JOB_START, SPECIAL_HALT_TARGET, JOB_REPLACE_IRREVERSIBLY, NULL, NULL);
break;
case EMERGENCY_ACTION_HALT_FORCE:
log_and_status(m, warn, "Forcibly halting", reason);
m->objective = MANAGER_HALT;
break;
case EMERGENCY_ACTION_HALT_IMMEDIATE:
log_and_status(m, warn, "Halting immediately", reason);
sync();
log_info("Halting.");
(void) reboot(RB_HALT_SYSTEM);
break;
default:
assert_not_reached();
}

5
src/core/emergency-action.h
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@ -18,6 +18,11 @@ typedef enum EmergencyAction {
EMERGENCY_ACTION_EXIT_FORCE,
EMERGENCY_ACTION_SOFT_REBOOT,
EMERGENCY_ACTION_SOFT_REBOOT_FORCE,
EMERGENCY_ACTION_KEXEC,
EMERGENCY_ACTION_KEXEC_FORCE,
EMERGENCY_ACTION_HALT,
EMERGENCY_ACTION_HALT_FORCE,
EMERGENCY_ACTION_HALT_IMMEDIATE,
_EMERGENCY_ACTION_MAX,
_EMERGENCY_ACTION_INVALID = -EINVAL,
} EmergencyAction;

8
src/test/test-emergency-action.c
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@ -38,6 +38,14 @@ TEST(parse_emergency_action) {
assert_se(parse_emergency_action("exit-force", RUNTIME_SCOPE_SYSTEM, &x) == 0);
assert_se(parse_emergency_action("exit-forcee", RUNTIME_SCOPE_SYSTEM, &x) == -EINVAL);
assert_se(x == EMERGENCY_ACTION_EXIT_FORCE);
assert_se(parse_emergency_action("kexec", RUNTIME_SCOPE_SYSTEM, &x) == 0);
assert_se(parse_emergency_action("kexec-force", RUNTIME_SCOPE_SYSTEM, &x) == 0);
assert_se(parse_emergency_action("kexec-forcee", RUNTIME_SCOPE_SYSTEM, &x) == -EINVAL);
assert_se(x == EMERGENCY_ACTION_KEXEC_FORCE);
assert_se(parse_emergency_action("halt", RUNTIME_SCOPE_SYSTEM, &x) == 0);
assert_se(parse_emergency_action("halt-force", RUNTIME_SCOPE_SYSTEM, &x) == 0);
assert_se(parse_emergency_action("halt-forcee", RUNTIME_SCOPE_SYSTEM, &x) == -EINVAL);
assert_se(x == EMERGENCY_ACTION_HALT_FORCE);
}
DEFINE_TEST_MAIN(LOG_INFO);

5
units/systemd-halt.service
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@ -13,7 +13,4 @@ Documentation=man:systemd-halt.service(8)
DefaultDependencies=no
Requires=shutdown.target umount.target final.target
After=shutdown.target umount.target final.target
[Service]
Type=oneshot
ExecStart=systemctl --force halt
SuccessAction=halt-force

5
units/systemd-kexec.service
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@ -13,7 +13,4 @@ Documentation=man:systemd-kexec.service(8)
DefaultDependencies=no
Requires=shutdown.target umount.target final.target
After=shutdown.target umount.target final.target
[Service]
Type=oneshot
ExecStart=systemctl --force kexec
SuccessAction=kexec-force