File _constraints of Package rust

<?xml version="1.0"?>
<constraints>
  <hardware>
  <processors>8</processors>
    <memory>
      <size unit="G">8</size>
    </memory>
    <disk>
      <size unit="G">20</size>
    </disk>
  </hardware>
  <overwrite>
    <conditions>
      <arch>armv6l</arch>
      <arch>armv7l</arch>
    </conditions>
    <hardware>
      <memory>
        <size unit="M">768</size>
      </memory>
    </hardware>
  </overwrite>
</constraints>