75193d4128
No functional change, just adjusting code to follow the same pattern everywhere. In particular, never call _verify() on an already loaded unit, but return early from the caller instead. This makes the code a bit easier to follow.
221 lines
5.6 KiB
C
221 lines
5.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include "dbus-target.h"
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#include "dbus-unit.h"
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#include "log.h"
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#include "serialize.h"
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#include "special.h"
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#include "string-util.h"
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#include "target.h"
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#include "unit-name.h"
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#include "unit.h"
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static const UnitActiveState state_translation_table[_TARGET_STATE_MAX] = {
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[TARGET_DEAD] = UNIT_INACTIVE,
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[TARGET_ACTIVE] = UNIT_ACTIVE
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};
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static void target_set_state(Target *t, TargetState state) {
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TargetState old_state;
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assert(t);
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if (t->state != state)
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bus_unit_send_pending_change_signal(UNIT(t), false);
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old_state = t->state;
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t->state = state;
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if (state != old_state)
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log_debug("%s changed %s -> %s",
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UNIT(t)->id,
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target_state_to_string(old_state),
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target_state_to_string(state));
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unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state], 0);
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}
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static int target_add_default_dependencies(Target *t) {
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static const UnitDependency deps[] = {
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UNIT_REQUIRES,
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UNIT_REQUISITE,
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UNIT_WANTS,
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UNIT_BINDS_TO,
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UNIT_PART_OF
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};
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int r;
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unsigned k;
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assert(t);
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if (!UNIT(t)->default_dependencies)
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return 0;
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/* Imply ordering for requirement dependencies on target units. Note that when the user created a contradicting
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* ordering manually we won't add anything in here to make sure we don't create a loop. */
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for (k = 0; k < ELEMENTSOF(deps); k++) {
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Unit *other;
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Iterator i;
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void *v;
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HASHMAP_FOREACH_KEY(v, other, UNIT(t)->dependencies[deps[k]], i) {
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r = unit_add_default_target_dependency(other, UNIT(t));
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if (r < 0)
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return r;
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}
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}
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if (unit_has_name(UNIT(t), SPECIAL_SHUTDOWN_TARGET))
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return 0;
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/* Make sure targets are unloaded on shutdown */
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return unit_add_two_dependencies_by_name(UNIT(t), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
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}
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static int target_load(Unit *u) {
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Target *t = TARGET(u);
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int r;
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assert(t);
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r = unit_load_fragment_and_dropin(u, true);
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if (r < 0)
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return r;
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if (u->load_state != UNIT_LOADED)
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return 0;
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/* This is a new unit? Then let's add in some extras */
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return target_add_default_dependencies(t);
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}
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static int target_coldplug(Unit *u) {
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Target *t = TARGET(u);
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assert(t);
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assert(t->state == TARGET_DEAD);
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if (t->deserialized_state != t->state)
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target_set_state(t, t->deserialized_state);
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return 0;
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}
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static void target_dump(Unit *u, FILE *f, const char *prefix) {
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Target *t = TARGET(u);
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assert(t);
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assert(f);
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fprintf(f,
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"%sTarget State: %s\n",
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prefix, target_state_to_string(t->state));
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}
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static int target_start(Unit *u) {
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Target *t = TARGET(u);
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int r;
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assert(t);
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assert(t->state == TARGET_DEAD);
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r = unit_acquire_invocation_id(u);
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if (r < 0)
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return r;
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target_set_state(t, TARGET_ACTIVE);
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return 1;
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}
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static int target_stop(Unit *u) {
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Target *t = TARGET(u);
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assert(t);
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assert(t->state == TARGET_ACTIVE);
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target_set_state(t, TARGET_DEAD);
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return 1;
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}
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static int target_serialize(Unit *u, FILE *f, FDSet *fds) {
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Target *s = TARGET(u);
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assert(s);
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assert(f);
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assert(fds);
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(void) serialize_item(f, "state", target_state_to_string(s->state));
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return 0;
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}
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static int target_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
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Target *s = TARGET(u);
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assert(u);
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assert(key);
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assert(value);
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assert(fds);
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if (streq(key, "state")) {
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TargetState state;
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state = target_state_from_string(value);
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if (state < 0)
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log_debug("Failed to parse state value %s", value);
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else
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s->deserialized_state = state;
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} else
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log_debug("Unknown serialization key '%s'", key);
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return 0;
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}
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_pure_ static UnitActiveState target_active_state(Unit *u) {
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assert(u);
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return state_translation_table[TARGET(u)->state];
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}
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_pure_ static const char *target_sub_state_to_string(Unit *u) {
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assert(u);
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return target_state_to_string(TARGET(u)->state);
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}
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const UnitVTable target_vtable = {
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.object_size = sizeof(Target),
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.sections =
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"Unit\0"
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"Target\0"
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"Install\0",
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.load = target_load,
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.coldplug = target_coldplug,
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.dump = target_dump,
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.start = target_start,
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.stop = target_stop,
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.serialize = target_serialize,
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.deserialize_item = target_deserialize_item,
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.active_state = target_active_state,
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.sub_state_to_string = target_sub_state_to_string,
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.bus_vtable = bus_target_vtable,
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.status_message_formats = {
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.finished_start_job = {
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[JOB_DONE] = "Reached target %s.",
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},
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.finished_stop_job = {
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[JOB_DONE] = "Stopped target %s.",
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},
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},
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};
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