21b735e798
Let's add a way to get the type-specific D-Bus interface of a unit from either its type or name to src/basic/unit-name.[ch]. That way we can share it with the client side, where it is useful in tools like cgls or machinectl. Also ports over machinectl to make use of this.
307 lines
8.3 KiB
C
307 lines
8.3 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
|
|
|
|
/***
|
|
This file is part of systemd.
|
|
|
|
Copyright 2010 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 "unit.h"
|
|
#include "snapshot.h"
|
|
#include "unit-name.h"
|
|
#include "dbus-snapshot.h"
|
|
#include "bus-common-errors.h"
|
|
|
|
static const UnitActiveState state_translation_table[_SNAPSHOT_STATE_MAX] = {
|
|
[SNAPSHOT_DEAD] = UNIT_INACTIVE,
|
|
[SNAPSHOT_ACTIVE] = UNIT_ACTIVE
|
|
};
|
|
|
|
static void snapshot_init(Unit *u) {
|
|
Snapshot *s = SNAPSHOT(u);
|
|
|
|
assert(s);
|
|
assert(UNIT(s)->load_state == UNIT_STUB);
|
|
|
|
UNIT(s)->ignore_on_isolate = true;
|
|
UNIT(s)->ignore_on_snapshot = true;
|
|
UNIT(s)->allow_isolate = true;
|
|
}
|
|
|
|
static void snapshot_set_state(Snapshot *s, SnapshotState state) {
|
|
SnapshotState old_state;
|
|
assert(s);
|
|
|
|
old_state = s->state;
|
|
s->state = state;
|
|
|
|
if (state != old_state)
|
|
log_unit_debug(UNIT(s), "Changed %s -> %s", snapshot_state_to_string(old_state), snapshot_state_to_string(state));
|
|
|
|
unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
|
|
}
|
|
|
|
static int snapshot_load(Unit *u) {
|
|
Snapshot *s = SNAPSHOT(u);
|
|
|
|
assert(u);
|
|
assert(u->load_state == UNIT_STUB);
|
|
|
|
/* Make sure that only snapshots created via snapshot_create()
|
|
* can be loaded */
|
|
if (!u->transient && UNIT(s)->manager->n_reloading <= 0)
|
|
return -ENOENT;
|
|
|
|
u->load_state = UNIT_LOADED;
|
|
return 0;
|
|
}
|
|
|
|
static int snapshot_coldplug(Unit *u) {
|
|
Snapshot *s = SNAPSHOT(u);
|
|
|
|
assert(s);
|
|
assert(s->state == SNAPSHOT_DEAD);
|
|
|
|
if (s->deserialized_state != s->state)
|
|
snapshot_set_state(s, s->deserialized_state);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void snapshot_dump(Unit *u, FILE *f, const char *prefix) {
|
|
Snapshot *s = SNAPSHOT(u);
|
|
|
|
assert(s);
|
|
assert(f);
|
|
|
|
fprintf(f,
|
|
"%sSnapshot State: %s\n"
|
|
"%sClean Up: %s\n",
|
|
prefix, snapshot_state_to_string(s->state),
|
|
prefix, yes_no(s->cleanup));
|
|
}
|
|
|
|
static int snapshot_start(Unit *u) {
|
|
Snapshot *s = SNAPSHOT(u);
|
|
|
|
assert(s);
|
|
assert(s->state == SNAPSHOT_DEAD);
|
|
|
|
snapshot_set_state(s, SNAPSHOT_ACTIVE);
|
|
|
|
if (s->cleanup)
|
|
unit_add_to_cleanup_queue(u);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int snapshot_stop(Unit *u) {
|
|
Snapshot *s = SNAPSHOT(u);
|
|
|
|
assert(s);
|
|
assert(s->state == SNAPSHOT_ACTIVE);
|
|
|
|
snapshot_set_state(s, SNAPSHOT_DEAD);
|
|
return 1;
|
|
}
|
|
|
|
static int snapshot_serialize(Unit *u, FILE *f, FDSet *fds) {
|
|
Snapshot *s = SNAPSHOT(u);
|
|
Unit *other;
|
|
Iterator i;
|
|
|
|
assert(s);
|
|
assert(f);
|
|
assert(fds);
|
|
|
|
unit_serialize_item(u, f, "state", snapshot_state_to_string(s->state));
|
|
unit_serialize_item(u, f, "cleanup", yes_no(s->cleanup));
|
|
SET_FOREACH(other, u->dependencies[UNIT_WANTS], i)
|
|
unit_serialize_item(u, f, "wants", other->id);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snapshot_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
|
|
Snapshot *s = SNAPSHOT(u);
|
|
int r;
|
|
|
|
assert(u);
|
|
assert(key);
|
|
assert(value);
|
|
assert(fds);
|
|
|
|
if (streq(key, "state")) {
|
|
SnapshotState state;
|
|
|
|
state = snapshot_state_from_string(value);
|
|
if (state < 0)
|
|
log_unit_debug(u, "Failed to parse state value: %s", value);
|
|
else
|
|
s->deserialized_state = state;
|
|
|
|
} else if (streq(key, "cleanup")) {
|
|
|
|
r = parse_boolean(value);
|
|
if (r < 0)
|
|
log_unit_debug(u, "Failed to parse cleanup value: %s", value);
|
|
else
|
|
s->cleanup = r;
|
|
|
|
} else if (streq(key, "wants")) {
|
|
|
|
r = unit_add_two_dependencies_by_name(u, UNIT_AFTER, UNIT_WANTS, value, NULL, true);
|
|
if (r < 0)
|
|
return r;
|
|
} else
|
|
log_unit_debug(u, "Unknown serialization key: %s", key);
|
|
|
|
return 0;
|
|
}
|
|
|
|
_pure_ static UnitActiveState snapshot_active_state(Unit *u) {
|
|
assert(u);
|
|
|
|
return state_translation_table[SNAPSHOT(u)->state];
|
|
}
|
|
|
|
_pure_ static const char *snapshot_sub_state_to_string(Unit *u) {
|
|
assert(u);
|
|
|
|
return snapshot_state_to_string(SNAPSHOT(u)->state);
|
|
}
|
|
|
|
int snapshot_create(Manager *m, const char *name, bool cleanup, sd_bus_error *e, Snapshot **_s) {
|
|
_cleanup_free_ char *n = NULL;
|
|
Unit *other, *u = NULL;
|
|
Iterator i;
|
|
int r;
|
|
const char *k;
|
|
|
|
assert(m);
|
|
assert(_s);
|
|
|
|
if (name) {
|
|
if (!unit_name_is_valid(name, UNIT_NAME_PLAIN))
|
|
return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is not valid.", name);
|
|
|
|
if (!endswith(name, ".snapshot"))
|
|
return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s lacks snapshot suffix.", name);
|
|
|
|
if (manager_get_unit(m, name))
|
|
return sd_bus_error_setf(e, BUS_ERROR_UNIT_EXISTS, "Snapshot %s exists already.", name);
|
|
|
|
} else {
|
|
|
|
for (;;) {
|
|
if (asprintf(&n, "snapshot-%u.snapshot", ++ m->n_snapshots) < 0)
|
|
return -ENOMEM;
|
|
|
|
if (!manager_get_unit(m, n)) {
|
|
name = n;
|
|
break;
|
|
}
|
|
|
|
n = mfree(n);
|
|
}
|
|
}
|
|
|
|
r = manager_load_unit_prepare(m, name, NULL, e, &u);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
u->transient = true;
|
|
manager_dispatch_load_queue(m);
|
|
assert(u->load_state == UNIT_LOADED);
|
|
|
|
HASHMAP_FOREACH_KEY(other, k, m->units, i) {
|
|
|
|
if (other->ignore_on_snapshot ||
|
|
other->transient)
|
|
continue;
|
|
|
|
if (k != other->id)
|
|
continue;
|
|
|
|
if (UNIT_VTABLE(other)->check_snapshot)
|
|
if (!UNIT_VTABLE(other)->check_snapshot(other))
|
|
continue;
|
|
|
|
if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
|
|
continue;
|
|
|
|
r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_WANTS, other, true);
|
|
if (r < 0)
|
|
goto fail;
|
|
}
|
|
|
|
SNAPSHOT(u)->cleanup = cleanup;
|
|
*_s = SNAPSHOT(u);
|
|
|
|
log_unit_info(u, "Created snapshot.");
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
if (u)
|
|
unit_add_to_cleanup_queue(u);
|
|
|
|
return r;
|
|
}
|
|
|
|
void snapshot_remove(Snapshot *s) {
|
|
assert(s);
|
|
|
|
log_unit_info(UNIT(s), "Removing snapshot.");
|
|
|
|
unit_add_to_cleanup_queue(UNIT(s));
|
|
}
|
|
|
|
static const char* const snapshot_state_table[_SNAPSHOT_STATE_MAX] = {
|
|
[SNAPSHOT_DEAD] = "dead",
|
|
[SNAPSHOT_ACTIVE] = "active"
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(snapshot_state, SnapshotState);
|
|
|
|
const UnitVTable snapshot_vtable = {
|
|
.object_size = sizeof(Snapshot),
|
|
|
|
.no_alias = true,
|
|
.no_instances = true,
|
|
.no_gc = true,
|
|
|
|
.init = snapshot_init,
|
|
.load = snapshot_load,
|
|
|
|
.coldplug = snapshot_coldplug,
|
|
|
|
.dump = snapshot_dump,
|
|
|
|
.start = snapshot_start,
|
|
.stop = snapshot_stop,
|
|
|
|
.serialize = snapshot_serialize,
|
|
.deserialize_item = snapshot_deserialize_item,
|
|
|
|
.active_state = snapshot_active_state,
|
|
.sub_state_to_string = snapshot_sub_state_to_string,
|
|
|
|
.bus_vtable = bus_snapshot_vtable
|
|
};
|