/*-*- 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; } free(n); n = NULL; } } 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_interface = "org.freedesktop.systemd1.Snapshot", .bus_vtable = bus_snapshot_vtable };