eceive-pack</em> have matching reference names, these
commands will be executed by this hook, instead of by the internal
<code>execute_commands()</code> function.  This hook is responsible for updating
the relevant references and reporting the results back to <em>receive-pack</em>.</p>
</div>
<div class="paragraph">
<p>This hook executes once for the receive operation.  It takes no
arguments, but uses a pkt-line format protocol to communicate with
<em>receive-pack</em> to read commands, push-options and sen