discover: implement a periodic requery for network devices
[petitboot] / discover / device-handler.c
index aa61bd25ae92eb7fc28d0b0bc8e3177fb368f9b4..42c95bb892ebba47985ae437c011e6f95b344b4d 100644 (file)
@@ -49,6 +49,8 @@ enum default_priority {
        DEFAULT_PRIORITY_DISABLED       = 0xff,
 };
 
+static int default_rescan_timeout = 5 * 60; /* seconds */
+
 struct progress_info {
        unsigned int                    percentage;
        unsigned long                   size;           /* size in bytes */
@@ -418,10 +420,13 @@ void device_handler_reinit(struct device_handler *handler)
 
        /* drop all devices */
        for (i = 0; i < handler->n_devices; i++) {
+               struct discover_device *device = handler->devices[i];
                discover_server_notify_device_remove(handler->server,
-                               handler->devices[i]->device);
-               ramdisk = handler->devices[i]->ramdisk;
-               talloc_free(handler->devices[i]);
+                               device->device);
+               ramdisk = device->ramdisk;
+               if (device->requery_waiter)
+                       waiter_remove(device->requery_waiter);
+               talloc_free(device);
                talloc_free(ramdisk);
        }
 
@@ -463,6 +468,9 @@ void device_handler_remove(struct device_handler *handler,
        struct discover_boot_option *opt, *tmp;
        unsigned int i;
 
+       if (device->requery_waiter)
+               waiter_remove(device->requery_waiter);
+
        list_for_each_entry_safe(&device->boot_options, opt, tmp, list) {
                if (opt == handler->default_boot_option) {
                        pb_log("Default option %s cancelled since device removed",
@@ -702,7 +710,17 @@ void device_handler_status_download_remove(struct device_handler *handler,
 
 static void device_handler_boot_status_cb(void *arg, struct status *status)
 {
-       device_handler_status(arg, status);
+       struct device_handler *handler = arg;
+
+       /* boot had failed; update handler state to allow a new default if one
+        * is found later
+        */
+       if (status->type == STATUS_ERROR) {
+               handler->pending_boot = NULL;
+               handler->default_boot_option = NULL;
+       }
+
+       device_handler_status(handler, status);
 }
 
 static void countdown_status(struct device_handler *handler,
@@ -1165,6 +1183,109 @@ out:
        return 0;
 }
 
+struct requery_data {
+       struct device_handler   *handler;
+       struct discover_device  *device;
+};
+
+static int device_handler_requery_timeout_fn(void *data)
+{
+       struct discover_boot_option *opt, *tmp;
+       struct requery_data *rqd = data;
+       struct device_handler *handler;
+       struct discover_device *device;
+
+       handler = rqd->handler;
+       device = rqd->device;
+
+       talloc_free(rqd);
+
+       /* network_requery_device may re-add a timeout, so clear the device
+        * waiter here, so we can potentially start a new one. */
+       device->requery_waiter = NULL;
+
+       /* We keep the device around, but get rid of the parsed boot
+        * options on that device. That involves delaring out the lists,
+        * and potentially cancelling a default.
+        */
+       list_for_each_entry_safe(&handler->unresolved_boot_options,
+                       opt, tmp, list) {
+               if (opt->device != device)
+                       continue;
+               list_remove(&opt->list);
+               talloc_free(opt);
+       }
+
+       list_for_each_entry_safe(&device->boot_options, opt, tmp, list) {
+               if (opt == handler->default_boot_option) {
+                       pb_log("Default option %s cancelled since device is being requeried",
+                                       opt->option->name);
+                       device_handler_cancel_default(handler);
+               }
+               list_remove(&opt->list);
+               talloc_free(opt);
+       }
+
+       discover_server_notify_device_remove(handler->server, device->device);
+       device->notified = false;
+
+       network_requery_device(handler->network, device);
+
+       return 0;
+}
+
+/* Schedule a requery in timeout (seconds).
+ *
+ * Special values of timeout:
+ *   0: no requery
+ *  -1: use default
+ */
+void device_handler_start_requery_timeout( struct device_handler *handler,
+               struct discover_device *dev, int timeout)
+{
+       struct requery_data *rqd;
+
+       if (dev->requery_waiter)
+               return;
+
+       if (timeout == -1)
+               timeout = default_rescan_timeout;
+       else if (timeout == 0)
+               return;
+
+       rqd = talloc(dev, struct requery_data);
+       rqd->handler = handler;
+       rqd->device = dev;
+
+       pb_debug("starting requery timeout for device %s, in %d sec\n",
+                       dev->device->id, timeout);
+
+       dev->requery_waiter = waiter_register_timeout(handler->waitset,
+                       timeout * 1000, device_handler_requery_timeout_fn, rqd);
+}
+
+static int event_requery_timeout(struct event *event)
+{
+       int timeout = -1;
+       unsigned long x;
+       const char *str;
+       char *endp;
+
+       if (!event)
+               return timeout;
+
+       str = event_get_param(event, "reboottime");
+       if (!str)
+               return timeout;
+
+       x = strtoul(str, &endp, 0);
+       if (endp != str)
+               timeout = x;
+
+       return timeout;
+}
+
+
 /* Incoming dhcp event */
 int device_handler_dhcp(struct device_handler *handler,
                struct discover_device *dev, struct event *event)
@@ -1182,6 +1303,9 @@ int device_handler_dhcp(struct device_handler *handler,
        talloc_steal(ctx, event);
        ctx->event = event;
 
+       device_handler_start_requery_timeout(handler, dev,
+                       event_requery_timeout(event));
+
        iterate_parsers(ctx);
 
        device_handler_discover_context_commit(handler, ctx);