From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?ISO-8859-1?Q?Santi_B=E9jar?= <santi@agolina.net>
Subject: Re: potential improvement to 'git log' with a range
Date: Sat, 10 Apr 2010 01:33:01 +0200
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To: Aghiles <aghilesk@gmail.com>
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On Sat, Apr 10, 2010 at 1:24 AM, Aghiles <aghilesk@gmail.com> wrote:
> If I type:
>
> =A0 =A0git log FETCH_HEAD~4..HEAD
>
> I get something. But if I type:
>
> =A0 =A0git log HEAD..FETCH_HEAD~4
>
> I get nothing. Is there a good reason for that ?
>

Yes.

$ git log -h
usage: git log [<options>] [<since>..<until>] [[--] <path>...]

So <since> and <until> are not equivalent. It list commits in <until>
but not in <since>.

In your case HEAD has commits not in FETCH_HEAD~4 (your first command)
while FETCH_HEAD~4 does not have commits not in HEAD. So HEAD is a
descendent of FETCH_HEAD~4.

Hope I didn't misunderstood your question.

HTH,
Santi