a40eb73224
In order to simplify writing of unit files introduce default dependencies that are added to all units unless explictly disabled in a unit. This option can be switched off for select units that are involved in early boot-up ot late system shutdown, This should simplify service files for most normal daemons, but breaks existing service files for software involved in early boot (notably udev), which need to be updated for a DefaultDependencies=no setting)
236 lines
6.3 KiB
C
236 lines
6.3 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <signal.h>
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#include "unit.h"
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#include "target.h"
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#include "load-fragment.h"
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#include "log.h"
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#include "dbus-target.h"
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#include "special.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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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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t->meta.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]);
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}
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static int target_add_default_dependencies(Target *t) {
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Iterator i;
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Unit *other;
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int r;
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/* Imply ordering for requirement dependencies
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* on target units. */
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SET_FOREACH(other, t->meta.dependencies[UNIT_REQUIRES], i)
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if ((r = unit_add_dependency(UNIT(t), UNIT_AFTER, other, true)) < 0)
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return r;
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SET_FOREACH(other, t->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
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if ((r = unit_add_dependency(UNIT(t), UNIT_AFTER, other, true)) < 0)
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return r;
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SET_FOREACH(other, t->meta.dependencies[UNIT_WANTS], i)
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if ((r = unit_add_dependency(UNIT(t), UNIT_AFTER, other, true)) < 0)
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return r;
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return 0;
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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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if ((r = unit_load_fragment_and_dropin(u)) < 0)
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return r;
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/* This is a new unit? Then let's add in some extras */
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if (u->meta.load_state == UNIT_LOADED) {
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if (u->meta.default_dependencies)
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if ((r = target_add_default_dependencies(t)) < 0)
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return r;
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}
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return 0;
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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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assert(t);
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assert(t->state == TARGET_DEAD);
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target_set_state(t, TARGET_ACTIVE);
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return 0;
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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 0;
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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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unit_serialize_item(u, 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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if ((state = target_state_from_string(value)) < 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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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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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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int target_get_runlevel(Target *t) {
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static const struct {
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const char *special;
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const int runlevel;
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} table[] = {
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{ SPECIAL_RUNLEVEL5_TARGET, '5' },
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{ SPECIAL_RUNLEVEL4_TARGET, '4' },
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{ SPECIAL_RUNLEVEL3_TARGET, '3' },
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{ SPECIAL_RUNLEVEL2_TARGET, '2' },
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{ SPECIAL_RESCUE_TARGET, '1' },
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{ SPECIAL_POWEROFF_TARGET, '0' },
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{ SPECIAL_REBOOT_TARGET, '6' },
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};
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unsigned i;
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assert(t);
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/* Tries to determine if this is a SysV runlevel and returns
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* it if that is so. */
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for (i = 0; i < ELEMENTSOF(table); i++)
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if (unit_has_name(UNIT(t), table[i].special))
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return table[i].runlevel;
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return 0;
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}
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static const char* const target_state_table[_TARGET_STATE_MAX] = {
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[TARGET_DEAD] = "dead",
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[TARGET_ACTIVE] = "active"
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};
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DEFINE_STRING_TABLE_LOOKUP(target_state, TargetState);
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const UnitVTable target_vtable = {
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.suffix = ".target",
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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_message_handler = bus_target_message_handler
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};
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