From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: [Q] Determing if a commit is reachable from the HEAD ?
Date: Mon, 23 Jan 2012 08:09:38 -0800
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To: Brian Foster <brian.foster@maxim-ic.com>
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Brian Foster <brian.foster@maxim-ic.com> writes:

>  I am probably misunderstanding ‘--quiet’, which the
>  man page cryptically describes as “... allow the
>  caller to test the exit status to see if a range
>  of objects is fully connected (or not).”  What is
>  meant here by “fully connected” ?

If the real history looks like this:

 ---Y---x---HEAD

i.e. the commit at HEAD says "parent x" in it, and your lacks "x"
for whatever reason, Y..HEAD is not fully connected.