nce transaction was aborted, no changes
were performed and the locks have been released.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>For each reference update that was added to the transaction, the hook
receives on standard input a line of the format:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>&lt;old-value&gt; SP &lt;new-value&gt; SP &lt;ref-name&gt; LF</pre>
</div>
</div>
<div class="paragraph">
<p>where <code>&lt;old-value&gt;</code> is the old object name passed into the refe