f2341e0a87
This changes log_unit_info() (and friends) to take a real Unit* object insted of just a unit name as parameter. The call will now prefix all logged messages with the unit name, thus allowing the unit name to be dropped from the various passed romat strings, simplifying invocations drastically, and unifying log output across messages. Also, UNIT= vs. USER_UNIT= is now derived from the Manager object attached to the Unit object, instead of getpid(). This has the benefit of correcting the field for --test runs. Also contains a couple of other logging improvements: - Drops a couple of strerror() invocations in favour of using %m. - Not only .mount units now warn if a symlinks exist for the mount point already, .automount units do that too, now. - A few invocations of log_struct() that didn't actually pass any additional structured data have been replaced by simpler invocations of log_unit_info() and friends. - For structured data a new LOG_UNIT_MESSAGE() macro has been added, that works like LOG_MESSAGE() but prefixes the message with the unit name. Similar, there's now LOG_LINK_MESSAGE() and LOG_NETDEV_MESSAGE(). - For structured data new LOG_UNIT_ID(), LOG_LINK_INTERFACE(), LOG_NETDEV_INTERFACE() macros have been added that generate the necessary per object fields. The old log_unit_struct() call has been removed in favour of these new macros used in raw log_struct() invocations. In addition to removing one more function call this allows generated structured log messages that contain two object fields, as necessary for example for network interfaces that are joined into another network interface, and whose messages shall be indexed by both. - The LOG_ERRNO() macro has been removed, in favour of log_struct_errno(). The latter has the benefit of ensuring that %m in format strings is properly resolved to the specified error number. - A number of logging messages have been converted to use log_unit_info() instead of log_info() - The client code in sysv-generator no longer #includes core code from src/core/. - log_unit_full_errno() has been removed, log_unit_full() instead takes an errno now, too. - log_unit_info(), log_link_info(), log_netdev_info() and friends, now avoid double evaluation of their parameters
309 lines
8.4 KiB
C
309 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-common-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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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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free(n);
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n = NULL;
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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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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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.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_vtable = bus_snapshot_vtable
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};
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