ant of the commit object named by the old object name.
That is, to enforce a "fast-forward only" policy.</p>
</div>
<div class="paragraph">
<p>It could also be used to log the old..new status.  However, it
does not know the entire set of branches, so it would end up
firing one e-mail per ref when used naively, though.  The
<a href="#post-receive"><em>post-receive</em></a> hook is more suited to that.</p>
</div>
<div class="paragraph">
<p>In an environment that restricts the users' access only to git
command