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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "dbus-target.h"
#include "dbus-unit.h"
#include "log.h"
#include "serialize.h"
#include "special.h"
#include "string-util.h"
#include "target.h"
#include "unit-name.h"
#include "unit.h"
static const UnitActiveState state_translation_table[_TARGET_STATE_MAX] = {
[TARGET_DEAD] = UNIT_INACTIVE,
[TARGET_ACTIVE] = UNIT_ACTIVE
};
static void target_set_state(Target *t, TargetState state) {
TargetState old_state;
assert(t);
if (t->state != state)
bus_unit_send_pending_change_signal(UNIT(t), false);
old_state = t->state;
t->state = state;
if (state != old_state)
log_debug("%s changed %s -> %s",
UNIT(t)->id,
target_state_to_string(old_state),
target_state_to_string(state));
unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state], /* reload_success = */ true);
}
static int target_add_default_dependencies(Target *t) {
_cleanup_free_ Unit **others = NULL;
int r, n_others;
assert(t);
if (!UNIT(t)->default_dependencies)
return 0;
/* Imply ordering for requirement dependencies on target units. Note that when the user created a
* contradicting ordering manually we won't add anything in here to make sure we don't create a
* loop.
*
* Note that quite likely iterating through these dependencies will add new dependencies, which
* conflicts with the hashmap-based iteration logic. Hence, instead of iterating through the
* dependencies and acting on them as we go, first take an "atomic snapshot" of sorts and iterate
* through that. */
n_others = unit_get_dependency_array(UNIT(t), UNIT_ATOM_ADD_DEFAULT_TARGET_DEPENDENCY_QUEUE, &others);
if (n_others < 0)
return n_others;
for (int i = 0; i < n_others; i++) {
r = unit_add_default_target_dependency(others[i], UNIT(t));
if (r < 0)
return r;
}
if (unit_has_name(UNIT(t), SPECIAL_SHUTDOWN_TARGET))
return 0;
/* Make sure targets are unloaded on shutdown */
return unit_add_two_dependencies_by_name(UNIT(t), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
}
static int target_load(Unit *u) {
Target *t = TARGET(u);
int r;
assert(t);
r = unit_load_fragment_and_dropin(u, true);
if (r < 0)
return r;
if (u->load_state != UNIT_LOADED)
return 0;
/* This is a new unit? Then let's add in some extras */
return target_add_default_dependencies(t);
}
static int target_coldplug(Unit *u) {
Target *t = TARGET(u);
assert(t);
assert(t->state == TARGET_DEAD);
if (t->deserialized_state != t->state)
target_set_state(t, t->deserialized_state);
return 0;
}
static void target_dump(Unit *u, FILE *f, const char *prefix) {
Target *t = TARGET(u);
assert(t);
assert(f);
fprintf(f,
"%sTarget State: %s\n",
prefix, target_state_to_string(t->state));
}
static int target_start(Unit *u) {
Target *t = TARGET(u);
int r;
assert(t);
assert(t->state == TARGET_DEAD);
r = unit_acquire_invocation_id(u);
if (r < 0)
return r;
target_set_state(t, TARGET_ACTIVE);
return 1;
}
static int target_stop(Unit *u) {
Target *t = TARGET(u);
assert(t);
assert(t->state == TARGET_ACTIVE);
target_set_state(t, TARGET_DEAD);
return 1;
}
static int target_serialize(Unit *u, FILE *f, FDSet *fds) {
Target *s = TARGET(u);
assert(s);
assert(f);
assert(fds);
(void) serialize_item(f, "state", target_state_to_string(s->state));
return 0;
}
static int target_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
Target *s = TARGET(u);
assert(s);
assert(u);
assert(key);
assert(value);
assert(fds);
if (streq(key, "state")) {
TargetState state;
state = target_state_from_string(value);
if (state < 0)
log_debug("Failed to parse state value %s", value);
else
s->deserialized_state = state;
} else
log_debug("Unknown serialization key '%s'", key);
return 0;
}
static UnitActiveState target_active_state(Unit *u) {
assert(u);
return state_translation_table[TARGET(u)->state];
}
static const char *target_sub_state_to_string(Unit *u) {
assert(u);
return target_state_to_string(TARGET(u)->state);
}
const UnitVTable target_vtable = {
.object_size = sizeof(Target),
.sections =
"Unit\0"
"Target\0"
"Install\0",
.can_fail = true,
.load = target_load,
.coldplug = target_coldplug,
.dump = target_dump,
.start = target_start,
.stop = target_stop,
.serialize = target_serialize,
.deserialize_item = target_deserialize_item,
.active_state = target_active_state,
.sub_state_to_string = target_sub_state_to_string,
.status_message_formats = {
.finished_start_job = {
[JOB_DONE] = "Reached target %s.",
},
.finished_stop_job = {
[JOB_DONE] = "Stopped target %s.",
},
},
};
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