+static void udev_device_tag(struct udev_device *dev, const char *tag, bool add)
+{
+ const char *id;
+ struct udev *udev = udev_device_get_udev(dev);
+ char filename[UTIL_PATH_SIZE];
+
+ id = udev_device_get_id_filename(dev);
+ if (id == NULL)
+ return;
+ util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/tags/", tag, "/", id, NULL);
+
+ if (add) {
+ int fd;
+
+ util_create_path(udev, filename);
+ fd = open(filename, O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
+ if (fd >= 0)
+ close(fd);
+ } else {
+ unlink(filename);
+ }
+}
+
+int udev_device_tag_index(struct udev_device *dev, struct udev_device *dev_old, bool add)
+{
+ struct udev_list_entry *list_entry;
+ bool found;
+
+ if (add && dev_old != NULL) {
+ /* delete possible left-over tags */
+ udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(dev_old)) {
+ const char *tag_old = udev_list_entry_get_name(list_entry);
+ struct udev_list_entry *list_entry_current;
+
+ found = false;
+ udev_list_entry_foreach(list_entry_current, udev_device_get_tags_list_entry(dev)) {
+ const char *tag = udev_list_entry_get_name(list_entry_current);
+
+ if (strcmp(tag, tag_old) == 0) {
+ found = true;
+ break;
+ }
+ }
+ if (!found)
+ udev_device_tag(dev_old, tag_old, false);
+ }
+ }
+
+ udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(dev))
+ udev_device_tag(dev, udev_list_entry_get_name(list_entry), add);
+
+ return 0;
+}
+
+static bool device_has_info(struct udev_device *udev_device)
+{
+ struct udev *udev = udev_device_get_udev(udev_device);
+ struct udev_list_entry *list_entry;
+
+ if (udev_device_get_devlinks_list_entry(udev_device) != NULL)
+ return true;
+ if (udev_device_get_devlink_priority(udev_device) != 0)
+ return true;
+ udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device))
+ if (udev_list_entry_get_num(list_entry))
+ return true;
+ if (udev_device_get_tags_list_entry(udev_device) != NULL)
+ return true;
+ if (udev_device_get_devnode(udev_device) != NULL && udev_device_get_knodename(udev_device) != NULL) {
+ size_t devlen = strlen(udev_get_dev_path(udev))+1;
+
+ if (strcmp(&udev_device_get_devnode(udev_device)[devlen], udev_device_get_knodename(udev_device)) != 0)
+ return true;
+ }
+ if (udev_device_get_watch_handle(udev_device) >= 0)
+ return true;
+ return false;
+}
+