X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=snapshot.c;h=513bf66475679106698f1983fba5a6d058bca519;hp=8fd819e2a9ef979785d1d63d4a34b7f59109b3af;hb=b29a8e58fa7c30dfcc4e4b1ccf9f409dc2935f8a;hpb=034c6ed7da5e44bfdde5a5d0da75f7b7a59953b8

diff --git a/snapshot.c b/snapshot.c
index 8fd819e2a..513bf6647 100644
--- a/snapshot.c
+++ b/snapshot.c
@@ -1,24 +1,276 @@
 /*-*- Mode: C; c-basic-offset: 8 -*-*/
 
-#include "name.h"
+/***
+  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 General Public License as published by
+  the Free Software Foundation; either version 2 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
+  General Public License for more details.
+
+  You should have received a copy of the GNU 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"
 
-static void snapshot_done(Name *n) {
-        Snapshot *s = SNAPSHOT(n);
+static const UnitActiveState state_translation_table[_SNAPSHOT_STATE_MAX] = {
+        [SNAPSHOT_DEAD] = UNIT_INACTIVE,
+        [SNAPSHOT_ACTIVE] = UNIT_ACTIVE
+};
 
+static void snapshot_set_state(Snapshot *s, SnapshotState state) {
+        SnapshotState old_state;
         assert(s);
 
-        /* Nothing here for now */
+        old_state = s->state;
+        s->state = state;
+
+        if (state != old_state)
+                log_debug("%s changed %s -> %s",
+                          UNIT(s)->meta.id,
+                          snapshot_state_to_string(old_state),
+                          snapshot_state_to_string(state));
+
+        unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
 }
 
-static NameActiveState snapshot_active_state(Name *n) {
-        return SNAPSHOT(n)->state == SNAPSHOT_DEAD ? NAME_INACTIVE : NAME_ACTIVE;
+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));
 }
 
-const NameVTable snapshot_vtable = {
+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 0;
+}
+
+static int snapshot_stop(Unit *u) {
+        Snapshot *s = SNAPSHOT(u);
+
+        assert(s);
+        assert(s->state == SNAPSHOT_ACTIVE);
+
+        snapshot_set_state(s, SNAPSHOT_DEAD);
+        return 0;
+}
+
+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->meta.dependencies[UNIT_REQUIRES], i)
+                unit_serialize_item(u, f, "requires", other->meta.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;
+
+                if ((state = snapshot_state_from_string(value)) < 0)
+                        log_debug("Failed to parse state value %s", value);
+                else
+                        s->deserialized_state = state;
+
+        } else if (streq(key, "cleanup")) {
+
+                if ((r = parse_boolean(value)) < 0)
+                        log_debug("Failed to parse cleanup value %s", value);
+                else
+                        s->cleanup = r;
+
+        } else if (streq(key, "requires")) {
+
+                if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, value, NULL, true)) < 0)
+                        return r;
+
+                if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, value, NULL, true)) < 0)
+                        return r;
+        } else
+                log_debug("Unknown serialization key '%s'", key);
+
+        return 0;
+}
+
+static UnitActiveState snapshot_active_state(Unit *u) {
+        assert(u);
+
+        return state_translation_table[SNAPSHOT(u)->state];
+}
+
+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, Snapshot **_s) {
+        Iterator i;
+        Unit *other, *u = NULL;
+        char *n = NULL;
+        int r;
+        const char *k;
+
+        assert(m);
+        assert(_s);
+
+        if (name) {
+                if (!unit_name_is_valid(name))
+                        return -EINVAL;
+
+                if (unit_name_to_type(name) != UNIT_SNAPSHOT)
+                        return -EINVAL;
+
+                if (manager_get_unit(m, name))
+                        return -EEXIST;
+
+        } else {
+
+                for (;;) {
+                        if (asprintf(&n, "snapshot-%u.snapshot", ++ m->n_snapshots) < 0)
+                                return -ENOMEM;
+
+                        if (!manager_get_unit(m, n))
+                                break;
+
+                        free(n);
+                }
+
+                name = n;
+        }
+
+        r = manager_load_unit(m, name, NULL, &u);
+        free(n);
+
+        if (r < 0)
+                goto fail;
+
+        HASHMAP_FOREACH_KEY(other, k, m->units, i) {
+
+                if (UNIT_VTABLE(other)->no_snapshots)
+                        continue;
+
+                if (k != other->meta.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;
+
+                if ((r = unit_add_dependency(u, UNIT_REQUIRES, other, true)) < 0)
+                        goto fail;
+
+                if ((r = unit_add_dependency(u, UNIT_AFTER, other, true)) < 0)
+                        goto fail;
+        }
+
+        SNAPSHOT(u)->cleanup = cleanup;
+        *_s = SNAPSHOT(u);
+
+        return 0;
+
+fail:
+        if (u)
+                unit_add_to_cleanup_queue(u);
+
+        return r;
+}
+
+void snapshot_remove(Snapshot *s) {
+        assert(s);
+
+        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 = {
         .suffix = ".snapshot",
 
-        .done = snapshot_done,
+        .no_alias = true,
+        .no_instances = true,
+        .no_snapshots = true,
+        .no_gc = true,
+
+        .load = unit_load_nop,
+        .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,
 
-        .active_state = snapshot_active_state
+        .bus_message_handler = bus_snapshot_message_handler
 };