304 lines
8.2 KiB
C
304 lines
8.2 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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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 Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser 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 "alloc-util.h"
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#include "bus-common-errors.h"
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#include "dbus-snapshot.h"
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#include "parse-util.h"
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#include "parse-util.h"
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#include "snapshot.h"
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#include "string-util.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[_SNAPSHOT_STATE_MAX] = {
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[SNAPSHOT_DEAD] = UNIT_INACTIVE,
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[SNAPSHOT_ACTIVE] = UNIT_ACTIVE
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};
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static void snapshot_init(Unit *u) {
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Snapshot *s = SNAPSHOT(u);
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assert(s);
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assert(UNIT(s)->load_state == UNIT_STUB);
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UNIT(s)->ignore_on_isolate = true;
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UNIT(s)->ignore_on_snapshot = true;
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UNIT(s)->allow_isolate = true;
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}
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static void snapshot_set_state(Snapshot *s, SnapshotState state) {
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SnapshotState old_state;
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assert(s);
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old_state = s->state;
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s->state = state;
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if (state != old_state)
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log_unit_debug(UNIT(s), "Changed %s -> %s", snapshot_state_to_string(old_state), snapshot_state_to_string(state));
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unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
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}
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static int snapshot_load(Unit *u) {
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Snapshot *s = SNAPSHOT(u);
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assert(u);
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assert(u->load_state == UNIT_STUB);
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/* Make sure that only snapshots created via snapshot_create()
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* can be loaded */
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if (!u->transient && UNIT(s)->manager->n_reloading <= 0)
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return -ENOENT;
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u->load_state = UNIT_LOADED;
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return 0;
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}
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static int snapshot_coldplug(Unit *u) {
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Snapshot *s = SNAPSHOT(u);
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assert(s);
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assert(s->state == SNAPSHOT_DEAD);
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if (s->deserialized_state != s->state)
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snapshot_set_state(s, s->deserialized_state);
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return 0;
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}
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static void snapshot_dump(Unit *u, FILE *f, const char *prefix) {
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Snapshot *s = SNAPSHOT(u);
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assert(s);
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assert(f);
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fprintf(f,
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"%sSnapshot State: %s\n"
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"%sClean Up: %s\n",
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prefix, snapshot_state_to_string(s->state),
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prefix, yes_no(s->cleanup));
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}
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static int snapshot_start(Unit *u) {
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Snapshot *s = SNAPSHOT(u);
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assert(s);
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assert(s->state == SNAPSHOT_DEAD);
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snapshot_set_state(s, SNAPSHOT_ACTIVE);
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if (s->cleanup)
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unit_add_to_cleanup_queue(u);
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return 1;
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}
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static int snapshot_stop(Unit *u) {
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Snapshot *s = SNAPSHOT(u);
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assert(s);
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assert(s->state == SNAPSHOT_ACTIVE);
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snapshot_set_state(s, SNAPSHOT_DEAD);
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return 1;
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}
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static int snapshot_serialize(Unit *u, FILE *f, FDSet *fds) {
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Snapshot *s = SNAPSHOT(u);
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Unit *other;
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Iterator i;
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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", snapshot_state_to_string(s->state));
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unit_serialize_item(u, f, "cleanup", yes_no(s->cleanup));
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SET_FOREACH(other, u->dependencies[UNIT_WANTS], i)
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unit_serialize_item(u, f, "wants", other->id);
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return 0;
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}
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static int snapshot_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
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Snapshot *s = SNAPSHOT(u);
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int r;
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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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SnapshotState state;
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state = snapshot_state_from_string(value);
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if (state < 0)
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log_unit_debug(u, "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 if (streq(key, "cleanup")) {
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r = parse_boolean(value);
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if (r < 0)
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log_unit_debug(u, "Failed to parse cleanup value: %s", value);
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else
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s->cleanup = r;
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} else if (streq(key, "wants")) {
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r = unit_add_two_dependencies_by_name(u, UNIT_AFTER, UNIT_WANTS, value, NULL, true);
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if (r < 0)
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return r;
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} else
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log_unit_debug(u, "Unknown serialization key: %s", key);
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return 0;
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}
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_pure_ static UnitActiveState snapshot_active_state(Unit *u) {
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assert(u);
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return state_translation_table[SNAPSHOT(u)->state];
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}
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_pure_ static const char *snapshot_sub_state_to_string(Unit *u) {
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assert(u);
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return snapshot_state_to_string(SNAPSHOT(u)->state);
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}
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int snapshot_create(Manager *m, const char *name, bool cleanup, sd_bus_error *e, Snapshot **_s) {
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_cleanup_free_ char *n = NULL;
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Unit *other, *u = NULL;
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Iterator i;
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int r;
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const char *k;
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assert(m);
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assert(_s);
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if (name) {
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if (!unit_name_is_valid(name, UNIT_NAME_PLAIN))
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return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is not valid.", name);
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if (!endswith(name, ".snapshot"))
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return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s lacks snapshot suffix.", name);
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if (manager_get_unit(m, name))
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return sd_bus_error_setf(e, BUS_ERROR_UNIT_EXISTS, "Snapshot %s exists already.", name);
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} else {
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for (;;) {
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if (asprintf(&n, "snapshot-%u.snapshot", ++ m->n_snapshots) < 0)
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return -ENOMEM;
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if (!manager_get_unit(m, n)) {
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name = n;
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break;
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}
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n = mfree(n);
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}
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}
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r = manager_load_unit_prepare(m, name, NULL, e, &u);
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if (r < 0)
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goto fail;
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u->transient = true;
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manager_dispatch_load_queue(m);
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assert(u->load_state == UNIT_LOADED);
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HASHMAP_FOREACH_KEY(other, k, m->units, i) {
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if (other->ignore_on_snapshot ||
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other->transient)
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continue;
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if (k != other->id)
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continue;
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if (UNIT_VTABLE(other)->check_snapshot)
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if (!UNIT_VTABLE(other)->check_snapshot(other))
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continue;
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if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
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continue;
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r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_WANTS, other, true);
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if (r < 0)
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goto fail;
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}
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SNAPSHOT(u)->cleanup = cleanup;
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*_s = SNAPSHOT(u);
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log_unit_info(u, "Created snapshot.");
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return 0;
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fail:
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if (u)
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unit_add_to_cleanup_queue(u);
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return r;
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}
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void snapshot_remove(Snapshot *s) {
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assert(s);
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log_unit_info(UNIT(s), "Removing snapshot.");
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unit_add_to_cleanup_queue(UNIT(s));
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}
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const UnitVTable snapshot_vtable = {
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.object_size = sizeof(Snapshot),
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.no_alias = true,
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.no_instances = true,
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.no_gc = true,
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.init = snapshot_init,
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.load = snapshot_load,
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.coldplug = snapshot_coldplug,
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.dump = snapshot_dump,
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.start = snapshot_start,
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.stop = snapshot_stop,
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.serialize = snapshot_serialize,
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.deserialize_item = snapshot_deserialize_item,
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.active_state = snapshot_active_state,
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.sub_state_to_string = snapshot_sub_state_to_string,
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.bus_vtable = bus_snapshot_vtable
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};
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