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-rw-r--r--snapshot.c161
1 files changed, 156 insertions, 5 deletions
diff --git a/snapshot.c b/snapshot.c
index 0039ca4610..1fc0ab8164 100644
--- a/snapshot.c
+++ b/snapshot.c
@@ -19,25 +19,176 @@
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 const UnitActiveState state_translation_table[_SNAPSHOT_STATE_MAX] = {
+ [SNAPSHOT_DEAD] = UNIT_INACTIVE,
+ [SNAPSHOT_ACTIVE] = UNIT_ACTIVE
+};
+
+static const char* const state_string_table[_SNAPSHOT_STATE_MAX] = {
+ [SNAPSHOT_DEAD] = "dead",
+ [SNAPSHOT_ACTIVE] = "active"
+};
+
+static int snapshot_load(Unit *u) {
+ Iterator i;
+ Unit *other;
+ int r;
+
+ assert(u);
+
+ HASHMAP_FOREACH(other, u->meta.manager->units, i) {
-static void snapshot_done(Unit *u) {
+ if (UNIT_VTABLE(other)->no_snapshots)
+ continue;
+
+ if ((r = unit_add_dependency(u, UNIT_REQUIRES, other)) < 0)
+ return r;
+
+ if ((r = unit_add_dependency(u, UNIT_AFTER, other)) < 0)
+ return r;
+ }
+
+ u->meta.load_state = UNIT_LOADED;
+
+ return 0;
+}
+
+static void snapshot_dump(Unit *u, FILE *f, const char *prefix) {
Snapshot *s = SNAPSHOT(u);
assert(s);
+ assert(f);
- /* Nothing here for now */
+ fprintf(f,
+ "%sSnapshot State: %s\n"
+ "%sClean Up: %s\n",
+ prefix, state_string_table[s->state],
+ prefix, yes_no(s->cleanup));
+}
+
+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_debug("%s changed %s → %s", UNIT(s)->meta.id, state_string_table[old_state], state_string_table[state]);
+
+ unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
+}
+
+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 UnitActiveState snapshot_active_state(Unit *u) {
- return SNAPSHOT(u)->state == SNAPSHOT_DEAD ? UNIT_INACTIVE : UNIT_ACTIVE;
+ assert(u);
+
+ return state_translation_table[SNAPSHOT(u)->state];
+}
+
+static const char *snapshot_sub_state_to_string(Unit *u) {
+ assert(u);
+
+ return state_string_table[SNAPSHOT(u)->state];
+}
+
+int snapshot_create(Manager *m, const char *name, bool cleanup, Snapshot **_s) {
+ Unit *u;
+ char *n = NULL;
+ int r;
+
+ 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)
+ return r;
+
+ SNAPSHOT(u)->cleanup = cleanup;
+ *_s = SNAPSHOT(u);
+
+ return 0;
+}
+
+void snapshot_remove(Snapshot *s) {
+ assert(s);
+
+ unit_add_to_cleanup_queue(UNIT(s));
}
const UnitVTable snapshot_vtable = {
.suffix = ".snapshot",
- .done = snapshot_done,
+ .no_alias = true,
+ .no_instances = true,
+ .no_snapshots = true,
+
+ .load = snapshot_load,
+
+ .dump = snapshot_dump,
+
+ .start = snapshot_start,
+ .stop = snapshot_stop,
+
+ .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
};