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Diffstat (limited to '')
| -rw-r--r-- | src/core/target.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/src/core/target.c b/src/core/target.c new file mode 100644 index 0000000..8f2a331 --- /dev/null +++ b/src/core/target.c @@ -0,0 +1,216 @@ +/* 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.", + }, + }, +}; |