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5430f7f2bc
We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.
310 lines
8.4 KiB
C
310 lines
8.4 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 "unit.h"
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#include "snapshot.h"
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#include "unit-name.h"
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#include "dbus-snapshot.h"
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#include "bus-errors.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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}
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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_debug("%s changed %s -> %s",
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UNIT(s)->id,
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snapshot_state_to_string(old_state),
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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 (!s->by_snapshot_create && 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 0;
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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 0;
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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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if ((state = snapshot_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 if (streq(key, "cleanup")) {
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if ((r = parse_boolean(value)) < 0)
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log_debug("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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if ((r = unit_add_two_dependencies_by_name(u, UNIT_AFTER, UNIT_WANTS, value, NULL, true)) < 0)
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return r;
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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 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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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, DBusError *e, Snapshot **_s) {
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Iterator i;
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Unit *other, *u = NULL;
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char *n = NULL;
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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, false)) {
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dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
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return -EINVAL;
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}
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if (unit_name_to_type(name) != UNIT_SNAPSHOT) {
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dbus_set_error(e, BUS_ERROR_UNIT_TYPE_MISMATCH, "Unit name %s lacks snapshot suffix.", name);
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return -EINVAL;
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}
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if (manager_get_unit(m, name)) {
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dbus_set_error(e, BUS_ERROR_UNIT_EXISTS, "Snapshot %s exists already.", name);
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return -EEXIST;
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}
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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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break;
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free(n);
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}
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name = n;
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}
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r = manager_load_unit_prepare(m, name, NULL, e, &u);
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free(n);
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if (r < 0)
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goto fail;
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SNAPSHOT(u)->by_snapshot_create = 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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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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if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_WANTS, other, true)) < 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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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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unit_add_to_cleanup_queue(UNIT(s));
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}
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static const char* const snapshot_state_table[_SNAPSHOT_STATE_MAX] = {
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[SNAPSHOT_DEAD] = "dead",
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[SNAPSHOT_ACTIVE] = "active"
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};
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DEFINE_STRING_TABLE_LOOKUP(snapshot_state, SnapshotState);
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const UnitVTable snapshot_vtable = {
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.suffix = ".snapshot",
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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_interface = "org.freedesktop.systemd1.Snapshot",
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.bus_message_handler = bus_snapshot_message_handler
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};
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