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core: Propagate condition failed state to triggering units.

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Alternative to https://github.com/systemd/systemd/pull/20531.

Whenever a service triggered by another unit fails condition checks,
stop the triggering unit to prevent systemd busy looping trying to
start the triggered unit.
This commit is contained in:
Daan De Meyer 2021-10-18 14:17:02 +02:00
parent 7454acd73f
commit 12ab94a1e4
13 changed files with 72 additions and 28 deletions
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16
src/core/automount.c
View File

@ -786,6 +786,11 @@ static void automount_enter_running(Automount *a) {
goto fail;
}
if (unit_has_failed_condition_or_assert(trigger)) {
automount_enter_dead(a, AUTOMOUNT_FAILURE_MOUNT_CONDITION_FAILED);
return;
}
r = manager_add_job(UNIT(a)->manager, JOB_START, trigger, JOB_REPLACE, NULL, &error, NULL);
if (r < 0) {
log_unit_warning(UNIT(a), "Failed to queue mount startup job: %s", bus_error_message(&error, r));
@ -1074,11 +1079,12 @@ static int automount_test_start_limit(Unit *u) {
}
static const char* const automount_result_table[_AUTOMOUNT_RESULT_MAX] = {
[AUTOMOUNT_SUCCESS] = "success",
[AUTOMOUNT_FAILURE_RESOURCES] = "resources",
[AUTOMOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
[AUTOMOUNT_FAILURE_MOUNT_START_LIMIT_HIT] = "mount-start-limit-hit",
[AUTOMOUNT_FAILURE_UNMOUNTED] = "unmounted",
[AUTOMOUNT_SUCCESS] = "success",
[AUTOMOUNT_FAILURE_RESOURCES] = "resources",
[AUTOMOUNT_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
[AUTOMOUNT_FAILURE_MOUNT_START_LIMIT_HIT] = "mount-start-limit-hit",
[AUTOMOUNT_FAILURE_UNMOUNTED] = "unmounted",
[AUTOMOUNT_FAILURE_MOUNT_CONDITION_FAILED] = "mount-condition-failed",
};
DEFINE_STRING_TABLE_LOOKUP(automount_result, AutomountResult);

1
src/core/automount.h
View File

@ -11,6 +11,7 @@ typedef enum AutomountResult {
AUTOMOUNT_FAILURE_UNMOUNTED,
AUTOMOUNT_FAILURE_START_LIMIT_HIT,
AUTOMOUNT_FAILURE_MOUNT_START_LIMIT_HIT,
AUTOMOUNT_FAILURE_MOUNT_CONDITION_FAILED,
_AUTOMOUNT_RESULT_MAX,
_AUTOMOUNT_RESULT_INVALID = -EINVAL,
} AutomountResult;

16
src/core/path.c
View File

@ -480,7 +480,7 @@ static void path_enter_dead(Path *p, PathResult f) {
p->result = f;
unit_log_result(UNIT(p), p->result == PATH_SUCCESS, path_result_to_string(p->result));
path_set_state(p, p->result != PATH_SUCCESS ? PATH_FAILED : PATH_DEAD);
path_set_state(p, p->result == PATH_SUCCESS ? PATH_DEAD : PATH_FAILED);
}
static void path_enter_running(Path *p) {
@ -780,6 +780,11 @@ static void path_trigger_notify(Unit *u, Unit *other) {
return;
}
if (unit_has_failed_condition_or_assert(other)) {
path_enter_dead(p, PATH_FAILURE_UNIT_CONDITION_FAILED);
return;
}
/* Don't propagate anything if there's still a job queued */
if (other->job)
return;
@ -832,10 +837,11 @@ static const char* const path_type_table[_PATH_TYPE_MAX] = {
DEFINE_STRING_TABLE_LOOKUP(path_type, PathType);
static const char* const path_result_table[_PATH_RESULT_MAX] = {
[PATH_SUCCESS] = "success",
[PATH_FAILURE_RESOURCES] = "resources",
[PATH_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
[PATH_FAILURE_UNIT_START_LIMIT_HIT] = "unit-start-limit-hit",
[PATH_SUCCESS] = "success",
[PATH_FAILURE_RESOURCES] = "resources",
[PATH_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
[PATH_FAILURE_UNIT_START_LIMIT_HIT] = "unit-start-limit-hit",
[PATH_FAILURE_UNIT_CONDITION_FAILED] = "unit-condition-failed",
};
DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult);

1
src/core/path.h
View File

@ -46,6 +46,7 @@ typedef enum PathResult {
PATH_FAILURE_RESOURCES,
PATH_FAILURE_START_LIMIT_HIT,
PATH_FAILURE_UNIT_START_LIMIT_HIT,
PATH_FAILURE_UNIT_CONDITION_FAILED,
_PATH_RESULT_MAX,
_PATH_RESULT_INVALID = -EINVAL,
} PathResult;

28
src/core/socket.c
View File

@ -2336,6 +2336,15 @@ static void socket_enter_running(Socket *s, int cfd_in) {
goto refuse;
}
if (UNIT_ISSET(s->service) && cfd < 0) {
Unit *service = UNIT_DEREF(s->service);
if (unit_has_failed_condition_or_assert(service)) {
socket_enter_dead(s, SOCKET_FAILURE_SERVICE_CONDITION_FAILED);
return;
}
}
if (cfd < 0) {
bool pending = false;
Unit *other;
@ -3445,15 +3454,16 @@ static const char* const socket_exec_command_table[_SOCKET_EXEC_COMMAND_MAX] = {
DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
static const char* const socket_result_table[_SOCKET_RESULT_MAX] = {
[SOCKET_SUCCESS] = "success",
[SOCKET_FAILURE_RESOURCES] = "resources",
[SOCKET_FAILURE_TIMEOUT] = "timeout",
[SOCKET_FAILURE_EXIT_CODE] = "exit-code",
[SOCKET_FAILURE_SIGNAL] = "signal",
[SOCKET_FAILURE_CORE_DUMP] = "core-dump",
[SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
[SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
[SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit"
[SOCKET_SUCCESS] = "success",
[SOCKET_FAILURE_RESOURCES] = "resources",
[SOCKET_FAILURE_TIMEOUT] = "timeout",
[SOCKET_FAILURE_EXIT_CODE] = "exit-code",
[SOCKET_FAILURE_SIGNAL] = "signal",
[SOCKET_FAILURE_CORE_DUMP] = "core-dump",
[SOCKET_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
[SOCKET_FAILURE_TRIGGER_LIMIT_HIT] = "trigger-limit-hit",
[SOCKET_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit",
[SOCKET_FAILURE_SERVICE_CONDITION_FAILED] = "service-condition-failed",
};
DEFINE_STRING_TABLE_LOOKUP(socket_result, SocketResult);

1
src/core/socket.h
View File

@ -38,6 +38,7 @@ typedef enum SocketResult {
SOCKET_FAILURE_START_LIMIT_HIT,
SOCKET_FAILURE_TRIGGER_LIMIT_HIT,
SOCKET_FAILURE_SERVICE_START_LIMIT_HIT,
SOCKET_FAILURE_SERVICE_CONDITION_FAILED,
_SOCKET_RESULT_MAX,
_SOCKET_RESULT_INVALID = -EINVAL,
} SocketResult;

12
src/core/timer.c
View File

@ -598,6 +598,11 @@ static void timer_enter_running(Timer *t) {
return;
}
if (unit_has_failed_condition_or_assert(trigger)) {
timer_enter_dead(t, TIMER_FAILURE_UNIT_CONDITION_FAILED);
return;
}
r = manager_add_job(UNIT(t)->manager, JOB_START, trigger, JOB_REPLACE, NULL, &error, NULL);
if (r < 0)
goto fail;
@ -911,9 +916,10 @@ static const char* const timer_base_table[_TIMER_BASE_MAX] = {
DEFINE_STRING_TABLE_LOOKUP(timer_base, TimerBase);
static const char* const timer_result_table[_TIMER_RESULT_MAX] = {
[TIMER_SUCCESS] = "success",
[TIMER_FAILURE_RESOURCES] = "resources",
[TIMER_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
[TIMER_SUCCESS] = "success",
[TIMER_FAILURE_RESOURCES] = "resources",
[TIMER_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
[TIMER_FAILURE_UNIT_CONDITION_FAILED] = "unit-condition-failed",
};
DEFINE_STRING_TABLE_LOOKUP(timer_result, TimerResult);

1
src/core/timer.h
View File

@ -32,6 +32,7 @@ typedef enum TimerResult {
TIMER_SUCCESS,
TIMER_FAILURE_RESOURCES,
TIMER_FAILURE_START_LIMIT_HIT,
TIMER_FAILURE_UNIT_CONDITION_FAILED,
_TIMER_RESULT_MAX,
_TIMER_RESULT_INVALID = -EINVAL,
} TimerResult;

10
src/core/unit.c
View File

@ -5865,6 +5865,16 @@ Condition *unit_find_failed_condition(Unit *u) {
return failed_trigger && !has_succeeded_trigger ? failed_trigger : NULL;
}
bool unit_has_failed_condition_or_assert(Unit *u) {
if (dual_timestamp_is_set(&u->condition_timestamp) && !u->condition_result)
return true;
if (dual_timestamp_is_set(&u->assert_timestamp) && !u->assert_result)
return true;
return false;
}
static const char* const collect_mode_table[_COLLECT_MODE_MAX] = {
[COLLECT_INACTIVE] = "inactive",
[COLLECT_INACTIVE_OR_FAILED] = "inactive-or-failed",

2
src/core/unit.h
View File

@ -988,6 +988,8 @@ int unit_thaw_vtable_common(Unit *u);
Condition *unit_find_failed_condition(Unit *u);
bool unit_has_failed_condition_or_assert(Unit *u);
/* Macros which append UNIT= or USER_UNIT= to the message */
#define log_unit_full_errno_zerook(unit, level, error, ...) \

2
test/testsuite-63.units/test63.service
View File

@ -1,6 +1,6 @@
# SPDX-License-Identifier: LGPL-2.1-or-later
[Unit]
ConditionPathExists=!/tmp/nonexistent
ConditionPathExists=/tmp/nonexistent
[Service]
ExecStart=true

2
test/units/testsuite-10.service
View File

@ -13,5 +13,5 @@ ExecStart=-socat -T20 OPEN:test.file UNIX-CONNECT:/run/test.ctl
# systemd enough time even on slower machines, to reach the trigger limit.
ExecStart=sleep 10
ExecStart=sh -x -c 'test "$(systemctl show test10.socket -P ActiveState)" = failed'
ExecStart=sh -x -c 'test "$(systemctl show test10.socket -P Result)" = trigger-limit-hit'
ExecStart=sh -x -c 'test "$(systemctl show test10.socket -P Result)" = service-condition-failed'
ExecStart=sh -x -c 'echo OK >/testok'

8
test/units/testsuite-63.service
View File

@ -8,10 +8,10 @@ Type=oneshot
ExecStart=rm -f /tmp/nonexistent
ExecStart=systemctl start test63.path
ExecStart=touch /tmp/test63
# Make sure systemd has sufficient time to hit the start limit for test63.service.
ExecStart=sleep 2
ExecStart=sh -x -c 'test "$(systemctl show test63.service -P ActiveState)" = failed'
ExecStart=sh -x -c 'test "$(systemctl show test63.service -P Result)" = start-limit-hit'
# Ensure both the service and the corresponding path unit go inactive due to the failed condition check.
ExecStart=sh -x -c 'test "$(systemctl show test63.service -P ActiveState)" = inactive'
ExecStart=sh -x -c 'test "$(systemctl show test63.service -P Result)" = success'
ExecStart=sh -x -c 'test "$(systemctl show test63.path -P ActiveState)" = failed'
ExecStart=sh -x -c 'test "$(systemctl show test63.path -P Result)" = unit-start-limit-hit'
ExecStart=sh -x -c 'test "$(systemctl show test63.path -P Result)" = unit-condition-failed'
ExecStart=sh -x -c 'echo OK >/testok'