Lennart Poettering
4f4afc88ec
With this change the logic for placing transient unit files and drop-ins generated via "systemctl set-property" is reworked. The latter are now placed in the newly introduced "control" unit file directory. The fomer are now placed in the "transient" unit file directory. Note that the properties originally set when a transient unit was created will be written to and stay in the transient unit file directory, while later changes are done via drop-ins. This is preparation for a later "systemctl revert" addition, where existing drop-ins are flushed out, but the original transient definition is restored.
349 lines
9.0 KiB
C
349 lines
9.0 KiB
C
/***
|
|
This file is part of systemd.
|
|
|
|
Copyright 2013 Lennart Poettering
|
|
|
|
systemd is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or
|
|
(at your option) any later version.
|
|
|
|
systemd is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
|
***/
|
|
|
|
#include <errno.h>
|
|
|
|
#include "alloc-util.h"
|
|
#include "dbus-slice.h"
|
|
#include "log.h"
|
|
#include "slice.h"
|
|
#include "special.h"
|
|
#include "string-util.h"
|
|
#include "strv.h"
|
|
#include "unit-name.h"
|
|
#include "unit.h"
|
|
|
|
static const UnitActiveState state_translation_table[_SLICE_STATE_MAX] = {
|
|
[SLICE_DEAD] = UNIT_INACTIVE,
|
|
[SLICE_ACTIVE] = UNIT_ACTIVE
|
|
};
|
|
|
|
static void slice_init(Unit *u) {
|
|
assert(u);
|
|
assert(u->load_state == UNIT_STUB);
|
|
|
|
u->ignore_on_isolate = true;
|
|
}
|
|
|
|
static void slice_set_state(Slice *t, SliceState state) {
|
|
SliceState old_state;
|
|
assert(t);
|
|
|
|
old_state = t->state;
|
|
t->state = state;
|
|
|
|
if (state != old_state)
|
|
log_debug("%s changed %s -> %s",
|
|
UNIT(t)->id,
|
|
slice_state_to_string(old_state),
|
|
slice_state_to_string(state));
|
|
|
|
unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state], true);
|
|
}
|
|
|
|
static int slice_add_parent_slice(Slice *s) {
|
|
char *a, *dash;
|
|
Unit *parent;
|
|
int r;
|
|
|
|
assert(s);
|
|
|
|
if (UNIT_ISSET(UNIT(s)->slice))
|
|
return 0;
|
|
|
|
if (unit_has_name(UNIT(s), SPECIAL_ROOT_SLICE))
|
|
return 0;
|
|
|
|
a = strdupa(UNIT(s)->id);
|
|
dash = strrchr(a, '-');
|
|
if (dash)
|
|
strcpy(dash, ".slice");
|
|
else
|
|
a = (char*) SPECIAL_ROOT_SLICE;
|
|
|
|
r = manager_load_unit(UNIT(s)->manager, a, NULL, NULL, &parent);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
unit_ref_set(&UNIT(s)->slice, parent);
|
|
return 0;
|
|
}
|
|
|
|
static int slice_add_default_dependencies(Slice *s) {
|
|
int r;
|
|
|
|
assert(s);
|
|
|
|
if (!UNIT(s)->default_dependencies)
|
|
return 0;
|
|
|
|
/* Make sure slices are unloaded on shutdown */
|
|
r = unit_add_two_dependencies_by_name(
|
|
UNIT(s),
|
|
UNIT_BEFORE, UNIT_CONFLICTS,
|
|
SPECIAL_SHUTDOWN_TARGET, NULL, true);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int slice_verify(Slice *s) {
|
|
_cleanup_free_ char *parent = NULL;
|
|
int r;
|
|
|
|
assert(s);
|
|
|
|
if (UNIT(s)->load_state != UNIT_LOADED)
|
|
return 0;
|
|
|
|
if (!slice_name_is_valid(UNIT(s)->id)) {
|
|
log_unit_error(UNIT(s), "Slice name %s is not valid. Refusing.", UNIT(s)->id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
r = slice_build_parent_slice(UNIT(s)->id, &parent);
|
|
if (r < 0)
|
|
return log_unit_error_errno(UNIT(s), r, "Failed to determine parent slice: %m");
|
|
|
|
if (parent ? !unit_has_name(UNIT_DEREF(UNIT(s)->slice), parent) : UNIT_ISSET(UNIT(s)->slice)) {
|
|
log_unit_error(UNIT(s), "Located outside of parent slice. Refusing.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int slice_load(Unit *u) {
|
|
Slice *s = SLICE(u);
|
|
int r;
|
|
|
|
assert(s);
|
|
assert(u->load_state == UNIT_STUB);
|
|
|
|
r = unit_load_fragment_and_dropin_optional(u);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* This is a new unit? Then let's add in some extras */
|
|
if (u->load_state == UNIT_LOADED) {
|
|
|
|
r = unit_patch_contexts(u);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = slice_add_parent_slice(s);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = slice_add_default_dependencies(s);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
return slice_verify(s);
|
|
}
|
|
|
|
static int slice_coldplug(Unit *u) {
|
|
Slice *t = SLICE(u);
|
|
|
|
assert(t);
|
|
assert(t->state == SLICE_DEAD);
|
|
|
|
if (t->deserialized_state != t->state)
|
|
slice_set_state(t, t->deserialized_state);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void slice_dump(Unit *u, FILE *f, const char *prefix) {
|
|
Slice *t = SLICE(u);
|
|
|
|
assert(t);
|
|
assert(f);
|
|
|
|
fprintf(f,
|
|
"%sSlice State: %s\n",
|
|
prefix, slice_state_to_string(t->state));
|
|
|
|
cgroup_context_dump(&t->cgroup_context, f, prefix);
|
|
}
|
|
|
|
static int slice_start(Unit *u) {
|
|
Slice *t = SLICE(u);
|
|
|
|
assert(t);
|
|
assert(t->state == SLICE_DEAD);
|
|
|
|
(void) unit_realize_cgroup(u);
|
|
(void) unit_reset_cpu_usage(u);
|
|
|
|
slice_set_state(t, SLICE_ACTIVE);
|
|
return 1;
|
|
}
|
|
|
|
static int slice_stop(Unit *u) {
|
|
Slice *t = SLICE(u);
|
|
|
|
assert(t);
|
|
assert(t->state == SLICE_ACTIVE);
|
|
|
|
/* We do not need to destroy the cgroup explicitly,
|
|
* unit_notify() will do that for us anyway. */
|
|
|
|
slice_set_state(t, SLICE_DEAD);
|
|
return 1;
|
|
}
|
|
|
|
static int slice_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
|
|
return unit_kill_common(u, who, signo, -1, -1, error);
|
|
}
|
|
|
|
static int slice_serialize(Unit *u, FILE *f, FDSet *fds) {
|
|
Slice *s = SLICE(u);
|
|
|
|
assert(s);
|
|
assert(f);
|
|
assert(fds);
|
|
|
|
unit_serialize_item(u, f, "state", slice_state_to_string(s->state));
|
|
return 0;
|
|
}
|
|
|
|
static int slice_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
|
|
Slice *s = SLICE(u);
|
|
|
|
assert(u);
|
|
assert(key);
|
|
assert(value);
|
|
assert(fds);
|
|
|
|
if (streq(key, "state")) {
|
|
SliceState state;
|
|
|
|
state = slice_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 slice_active_state(Unit *u) {
|
|
assert(u);
|
|
|
|
return state_translation_table[SLICE(u)->state];
|
|
}
|
|
|
|
_pure_ static const char *slice_sub_state_to_string(Unit *u) {
|
|
assert(u);
|
|
|
|
return slice_state_to_string(SLICE(u)->state);
|
|
}
|
|
|
|
static void slice_enumerate(Manager *m) {
|
|
Unit *u;
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
u = manager_get_unit(m, SPECIAL_ROOT_SLICE);
|
|
if (!u) {
|
|
u = unit_new(m, sizeof(Slice));
|
|
if (!u) {
|
|
log_oom();
|
|
return;
|
|
}
|
|
|
|
r = unit_add_name(u, SPECIAL_ROOT_SLICE);
|
|
if (r < 0) {
|
|
unit_free(u);
|
|
log_error_errno(r, "Failed to add -.slice name");
|
|
return;
|
|
}
|
|
}
|
|
|
|
u->default_dependencies = false;
|
|
u->no_gc = true;
|
|
u->ignore_on_isolate = true;
|
|
u->refuse_manual_start = true;
|
|
u->refuse_manual_stop = true;
|
|
SLICE(u)->deserialized_state = SLICE_ACTIVE;
|
|
|
|
if (!u->description)
|
|
u->description = strdup("Root Slice");
|
|
if (!u->documentation)
|
|
(void) strv_extend(&u->documentation, "man:systemd.special(7)");
|
|
|
|
unit_add_to_load_queue(u);
|
|
unit_add_to_dbus_queue(u);
|
|
}
|
|
|
|
const UnitVTable slice_vtable = {
|
|
.object_size = sizeof(Slice),
|
|
.cgroup_context_offset = offsetof(Slice, cgroup_context),
|
|
|
|
.sections =
|
|
"Unit\0"
|
|
"Slice\0"
|
|
"Install\0",
|
|
.private_section = "Slice",
|
|
|
|
.no_alias = true,
|
|
.no_instances = true,
|
|
.can_transient = true,
|
|
|
|
.init = slice_init,
|
|
.load = slice_load,
|
|
|
|
.coldplug = slice_coldplug,
|
|
|
|
.dump = slice_dump,
|
|
|
|
.start = slice_start,
|
|
.stop = slice_stop,
|
|
|
|
.kill = slice_kill,
|
|
|
|
.serialize = slice_serialize,
|
|
.deserialize_item = slice_deserialize_item,
|
|
|
|
.active_state = slice_active_state,
|
|
.sub_state_to_string = slice_sub_state_to_string,
|
|
|
|
.bus_vtable = bus_slice_vtable,
|
|
.bus_set_property = bus_slice_set_property,
|
|
.bus_commit_properties = bus_slice_commit_properties,
|
|
|
|
.enumerate = slice_enumerate,
|
|
|
|
.status_message_formats = {
|
|
.finished_start_job = {
|
|
[JOB_DONE] = "Created slice %s.",
|
|
},
|
|
.finished_stop_job = {
|
|
[JOB_DONE] = "Removed slice %s.",
|
|
},
|
|
},
|
|
};
|