dbus: implement systemd side of dbus activation glue

1 files changed, 78 insertions, 4 deletions

diff --git a/src/dbus.c b/src/dbus.c
index f5bbc58..7916817 100644
--- a/src/dbus.c
+++ b/src/dbus.c
@@ -65,6 +65,8 @@ const char *const bus_interface_table[] = {
         NULL
 };
 
+static const char *error_to_dbus(int error);
+
 static void api_bus_dispatch_status(DBusConnection *bus, DBusDispatchStatus status, void *data)  {
         Manager *m = data;
 
@@ -333,6 +335,7 @@ static void bus_toggle_timeout(DBusTimeout *timeout, void *data) {
 static DBusHandlerResult api_bus_message_filter(DBusConnection  *connection, DBusMessage  *message, void *data) {
         Manager *m = data;
         DBusError error;
+        DBusMessage *reply = NULL;
 
         assert(connection);
         assert(message);
@@ -340,10 +343,10 @@ static DBusHandlerResult api_bus_message_filter(DBusConnection  *connection, DBu
 
         dbus_error_init(&error);
 
-        /* log_debug("Got D-Bus request: %s.%s() on %s", */
-        /*           dbus_message_get_interface(message), */
-        /*           dbus_message_get_member(message), */
-        /*           dbus_message_get_path(message)); */
+        log_debug("Got D-Bus request: %s.%s() on %s",
+                  dbus_message_get_interface(message),
+                  dbus_message_get_member(message),
+                  dbus_message_get_path(message));
 
         if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
                 log_error("Warning! API D-Bus connection terminated.");
@@ -370,10 +373,65 @@ static DBusHandlerResult api_bus_message_filter(DBusConnection  *connection, DBu
 
                         manager_dispatch_bus_name_owner_changed(m, name, old_owner, new_owner);
                 }
+        } else if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Activator", "ActivationRequest")) {
+                const char *name;
+
+                if (!dbus_message_get_args(message, &error,
+                                           DBUS_TYPE_STRING, &name,
+                                           DBUS_TYPE_INVALID))
+                        log_error("Failed to parse ActivationRequest message: %s", error.message);
+                else  {
+                        int r;
+                        Unit *u;
+
+                        r = manager_load_unit(m, name, NULL, &u);
+
+                        if (r >= 0 && u->meta.only_by_dependency)
+                                r = -EPERM;
+
+                        if (r >= 0)
+                                r = manager_add_job(m, JOB_START, u, JOB_REPLACE, true, NULL);
+
+                        if (r < 0) {
+                                const char *id, *text;
+
+                                if (!(reply = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Activator", "ActivationFailure")))
+                                        goto oom;
+
+                                id = error_to_dbus(r);
+                                text = strerror(-r);
+
+                                if (!dbus_message_set_destination(reply, DBUS_SERVICE_DBUS) ||
+                                    !dbus_message_append_args(reply,
+                                                              DBUS_TYPE_STRING, &name,
+                                                              DBUS_TYPE_STRING, &id,
+                                                              DBUS_TYPE_STRING, &text,
+                                                              DBUS_TYPE_INVALID))
+                                        goto oom;
+                        }
+
+                        /* On success we don't do anything, the service will be spwaned now */
+                }
         }
 
         dbus_error_free(&error);
+
+        if (reply) {
+                if (!dbus_connection_send(connection, reply, NULL))
+                        goto oom;
+
+                dbus_message_unref(reply);
+        }
+
         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+
+oom:
+        if (reply)
+                dbus_message_unref(reply);
+
+        dbus_error_free(&error);
+
+        return DBUS_HANDLER_RESULT_NEED_MEMORY;
 }
 
 static DBusHandlerResult system_bus_message_filter(DBusConnection  *connection, DBusMessage  *message, void *data) {
@@ -642,6 +700,7 @@ int bus_init_api(Manager *m) {
                 return -ENOMEM;
         }
 
+        /* Get NameOwnerChange messages */
         dbus_bus_add_match(m->api_bus,
                            "type='signal',"
                            "sender='"DBUS_SERVICE_DBUS"',"
@@ -656,6 +715,21 @@ int bus_init_api(Manager *m) {
                 return -ENOMEM;
         }
 
+        /* Get activation requests */
+        dbus_bus_add_match(m->api_bus,
+                           "type='signal',"
+                           "sender='"DBUS_SERVICE_DBUS"',"
+                           "interface='org.freedesktop.systemd1.Activator',"
+                           "path='"DBUS_PATH_DBUS"'",
+                           &error);
+
+        if (dbus_error_is_set(&error)) {
+                log_error("Failed to register match: %s", error.message);
+                dbus_error_free(&error);
+                bus_done_api(m);
+                return -ENOMEM;
+        }
+
         if ((r = request_name(m)) < 0) {
                 bus_done_api(m);
                 return r;