func amendSetting(store *storage.Storage, tx *storage.Tx, name, value string) error {
if name == "" {
return fmt.Errorf("setting name must be specified")
}
if value == "" {
return fmt.Errorf("setting '%v' value must be specified", name)
}
setting, err := store.Setting(tx, name)
if err != nil {
return fmt.Errorf("could not retrieve setting '%v'", err)
}
if setting == nil {
return fmt.Errorf("no such setting '%v'", name)
}
if _, err = store.UpdateSetting(tx, name, value); err != nil {
return fmt.Errorf("could not update setting '%v': %v", name, err)
}
return nil
}