vsphere/tags_helper.go
func tagByName(client *tags.RestClient, name, categoryID string) (string, error) {
	ctx, cancel := context.WithTimeout(context.Background(), defaultAPITimeout)
	defer cancel()
	tags, err := client.GetTagByNameForCategory(ctx, name, categoryID)
	if err != nil {
		return "", fmt.Errorf("could not get tag for name %q: %s", name, err)
	}

	if len(tags) < 1 {
		return "", fmt.Errorf("tag name %q not found in category ID %q", name, categoryID)
	}
	if len(tags) > 1 {
		// This situation is very similar to the one in tagCategoryByName. The API
		// docs even say that tags need to be unique in categories, yet
		// GetTagByNameForCategory still returns multiple results.
		return "", fmt.Errorf(vSphereTagSearchErrMultiple, name)
	}

	return tags[0].ID, nil
}
func tagByName(client *tags.RestClient, name, categoryID string) (string, error) {
	ctx, cancel := context.WithTimeout(context.Background(), defaultAPITimeout)
	defer cancel()
	tags, err := client.GetTagByNameForCategory(ctx, name, categoryID)
	if err != nil {
		return "", fmt.Errorf("could not get tag for name %q: %s", name, err)
	}

	if len(tags) < 1 {
		return "", fmt.Errorf("tag name %q not found in category ID %q", name, categoryID)
	}
	if len(tags) > 1 {
		// This situation is very similar to the one in tagCategoryByName. The API
		// docs even say that tags need to be unique in categories, yet
		// GetTagByNameForCategory still returns multiple results.
		return "", fmt.Errorf(vSphereTagSearchErrMultiple, name)
	}

	return tags[0].ID, nil
}
// tagByName locates a tag by it supplied name and category ID. Use
// tagCategoryByName to get the tag category ID if require the category ID as
// well.