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-rw-r--r--src/core/target.c216
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..6225df5
--- /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], 0);
+}
+
+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;
+}
+
+_pure_ static UnitActiveState target_active_state(Unit *u) {
+ assert(u);
+
+ return state_translation_table[TARGET(u)->state];
+}
+
+_pure_ 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.",
+ },
+ },
+};