src/core/snapshot.c

	snapshot.c revision 6bedfcbb2970e06a4d3280c8fb62083d252ede73
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek/***
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek  This file is part of systemd.
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek  Copyright 2010 Lennart Poettering
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek  systemd is free software; you can redistribute it and/or modify it
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek  under the terms of the GNU Lesser General Public License as published by
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek  the Free Software Foundation; either version 2.1 of the License, or
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek  (at your option) any later version.
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek  systemd is distributed in the hope that it will be useful, but
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek  WITHOUT ANY WARRANTY; without even the implied warranty of
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek  Lesser General Public License for more details.
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek  You should have received a copy of the GNU Lesser General Public License
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek  along with systemd; If not, see <http://www.gnu.org/licenses/>.
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek***/
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek#include <errno.h>
3ffd4af22052963e7a29431721ee204e634bea75Lennart Poettering
4f5dd3943bef8a04be7e3b838b822bb9a7ad6cb3Lennart Poettering#include "bus-common-errors.h"
3ffd4af22052963e7a29431721ee204e634bea75Lennart Poettering#include "dbus-snapshot.h"
4f5dd3943bef8a04be7e3b838b822bb9a7ad6cb3Lennart Poettering#include "parse-util.h"
4f5dd3943bef8a04be7e3b838b822bb9a7ad6cb3Lennart Poettering#include "parse-util.h"
07630cea1f3a845c09309f197ac7c4f11edd3b62Lennart Poettering#include "snapshot.h"
4f5dd3943bef8a04be7e3b838b822bb9a7ad6cb3Lennart Poettering#include "string-util.h"
4f5dd3943bef8a04be7e3b838b822bb9a7ad6cb3Lennart Poettering#include "unit-name.h"
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek#include "unit.h"
8eea868708923a092ee85d6146ba4c04b7baea06Zbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmekstatic const UnitActiveState state_translation_table[_SNAPSHOT_STATE_MAX] = {
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        [SNAPSHOT_DEAD] = UNIT_INACTIVE,
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        [SNAPSHOT_ACTIVE] = UNIT_ACTIVE
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek};
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
8eea868708923a092ee85d6146ba4c04b7baea06Zbigniew Jędrzejewski-Szmekstatic void snapshot_init(Unit *u) {
8eea868708923a092ee85d6146ba4c04b7baea06Zbigniew Jędrzejewski-Szmek        Snapshot *s = SNAPSHOT(u);
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        assert(s);
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        assert(UNIT(s)->load_state == UNIT_STUB);
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        UNIT(s)->ignore_on_isolate = true;
8eea868708923a092ee85d6146ba4c04b7baea06Zbigniew Jędrzejewski-Szmek        UNIT(s)->ignore_on_snapshot = true;
8eea868708923a092ee85d6146ba4c04b7baea06Zbigniew Jędrzejewski-Szmek        UNIT(s)->allow_isolate = true;
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek}
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmekstatic void snapshot_set_state(Snapshot *s, SnapshotState state) {
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        SnapshotState old_state;
ae6c3cc009a21df4b51851fb8fe3fde0b7d6d8f0Lennart Poettering        assert(s);
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        old_state = s->state;
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        s->state = state;
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        if (state != old_state)
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek                log_unit_debug(UNIT(s), "Changed %s -> %s", snapshot_state_to_string(old_state), snapshot_state_to_string(state));
8eea868708923a092ee85d6146ba4c04b7baea06Zbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek}
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmekstatic int snapshot_load(Unit *u) {
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        Snapshot *s = SNAPSHOT(u);
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        assert(u);
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        assert(u->load_state == UNIT_STUB);
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        /* Make sure that only snapshots created via snapshot_create()
8eea868708923a092ee85d6146ba4c04b7baea06Zbigniew Jędrzejewski-Szmek         * can be loaded */
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        if (!u->transient && UNIT(s)->manager->n_reloading <= 0)
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek                return -ENOENT;
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        u->load_state = UNIT_LOADED;
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        return 0;
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek}
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmekstatic int snapshot_coldplug(Unit *u) {
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        Snapshot *s = SNAPSHOT(u);
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
8eea868708923a092ee85d6146ba4c04b7baea06Zbigniew Jędrzejewski-Szmek        assert(s);
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        assert(s->state == SNAPSHOT_DEAD);
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        if (s->deserialized_state != s->state)
45519fd6304aae453d95c6cf11bfc8539c38494cLennart Poettering                snapshot_set_state(s, s->deserialized_state);
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        return 0;
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek}
8eea868708923a092ee85d6146ba4c04b7baea06Zbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmekstatic void snapshot_dump(Unit *u, FILE *f, const char *prefix) {
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        Snapshot *s = SNAPSHOT(u);
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        assert(s);
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        assert(f);
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        fprintf(f,
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek                "%sSnapshot State: %s\n"
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek                "%sClean Up: %s\n",
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek                prefix, snapshot_state_to_string(s->state),
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek                prefix, yes_no(s->cleanup));
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek}
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmekstatic int snapshot_start(Unit *u) {
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        Snapshot *s = SNAPSHOT(u);
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek        assert(s);
8eea868708923a092ee85d6146ba4c04b7baea06Zbigniew Jędrzejewski-Szmek        assert(s->state == SNAPSHOT_DEAD);
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        snapshot_set_state(s, SNAPSHOT_ACTIVE);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        if (s->cleanup)
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                unit_add_to_cleanup_queue(u);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        return 1;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek}
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmekstatic int snapshot_stop(Unit *u) {
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        Snapshot *s = SNAPSHOT(u);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        assert(s);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        assert(s->state == SNAPSHOT_ACTIVE);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        snapshot_set_state(s, SNAPSHOT_DEAD);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        return 1;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek}
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmekstatic int snapshot_serialize(Unit *u, FILE *f, FDSet *fds) {
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        Snapshot *s = SNAPSHOT(u);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        Unit *other;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        Iterator i;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        assert(s);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        assert(f);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        assert(fds);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        unit_serialize_item(u, f, "state", snapshot_state_to_string(s->state));
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        unit_serialize_item(u, f, "cleanup", yes_no(s->cleanup));
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        SET_FOREACH(other, u->dependencies[UNIT_WANTS], i)
45519fd6304aae453d95c6cf11bfc8539c38494cLennart Poettering                unit_serialize_item(u, f, "wants", other->id);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        return 0;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek}
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmekstatic int snapshot_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        Snapshot *s = SNAPSHOT(u);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        int r;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        assert(u);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        assert(key);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        assert(value);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        assert(fds);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        if (streq(key, "state")) {
a34bf9db5da0fdd6bdb14459e203dbe41ee99614Lennart Poettering                SnapshotState state;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                state = snapshot_state_from_string(value);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                if (state < 0)
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                        log_unit_debug(u, "Failed to parse state value: %s", value);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                else
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                        s->deserialized_state = state;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        } else if (streq(key, "cleanup")) {
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                r = parse_boolean(value);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                if (r < 0)
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                        log_unit_debug(u, "Failed to parse cleanup value: %s", value);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                else
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                        s->cleanup = r;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
7410616cd9dbbec97cf98d75324da5cda2b2f7a2Lennart Poettering        } else if (streq(key, "wants")) {
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                r = unit_add_two_dependencies_by_name(u, UNIT_AFTER, UNIT_WANTS, value, NULL, true);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                if (r < 0)
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                        return r;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        } else
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                log_unit_debug(u, "Unknown serialization key: %s", key);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        return 0;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek}
7410616cd9dbbec97cf98d75324da5cda2b2f7a2Lennart Poettering
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek_pure_ static UnitActiveState snapshot_active_state(Unit *u) {
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        assert(u);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        return state_translation_table[SNAPSHOT(u)->state];
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek}
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek_pure_ static const char *snapshot_sub_state_to_string(Unit *u) {
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        assert(u);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        return snapshot_state_to_string(SNAPSHOT(u)->state);
7410616cd9dbbec97cf98d75324da5cda2b2f7a2Lennart Poettering}
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
7410616cd9dbbec97cf98d75324da5cda2b2f7a2Lennart Poetteringint snapshot_create(Manager *m, const char *name, bool cleanup, sd_bus_error *e, Snapshot **_s) {
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        _cleanup_free_ char *n = NULL;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        Unit *other, *u = NULL;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        Iterator i;
7410616cd9dbbec97cf98d75324da5cda2b2f7a2Lennart Poettering        int r;
7410616cd9dbbec97cf98d75324da5cda2b2f7a2Lennart Poettering        const char *k;
7410616cd9dbbec97cf98d75324da5cda2b2f7a2Lennart Poettering
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        assert(m);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        assert(_s);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        if (name) {
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                if (!unit_name_is_valid(name, UNIT_NAME_PLAIN))
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                        return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is not valid.", name);
7410616cd9dbbec97cf98d75324da5cda2b2f7a2Lennart Poettering
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                if (!endswith(name, ".snapshot"))
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                        return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s lacks snapshot suffix.", name);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                if (manager_get_unit(m, name))
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                        return sd_bus_error_setf(e, BUS_ERROR_UNIT_EXISTS, "Snapshot %s exists already.", name);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        } else {
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                for (;;) {
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                        if (asprintf(&n, "snapshot-%u.snapshot", ++ m->n_snapshots) < 0)
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                                return -ENOMEM;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                        if (!manager_get_unit(m, n)) {
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                                name = n;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                                break;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                        }
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                        n = mfree(n);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                }
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        }
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        r = manager_load_unit_prepare(m, name, NULL, e, &u);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        if (r < 0)
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                goto fail;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        u->transient = true;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        manager_dispatch_load_queue(m);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        assert(u->load_state == UNIT_LOADED);
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek        HASHMAP_FOREACH_KEY(other, k, m->units, i) {
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                if (other->ignore_on_snapshot ||
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                    other->transient)
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                        continue;
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek
1a7f1b385cd9de8a0da934fadc379860f914ef33Zbigniew Jędrzejewski-Szmek                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));
}

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
};