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From:   Junio C Hamano <gitster@pobox.com>
To:     "Philip Oakley" <philipoakley@iee.org>
Cc:     "Git List" <git@vger.kernel.org>
Subject: Re: Are --first-parent and --ancestry-path compatible rev-list options?
References: <2FA1998250474E76A386B82AD635E56A@PhilipOakley>
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        <CD6AE25418644EB688D4488F8AB40155@PhilipOakley>
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        <1BC836ACA8C741AD9732122B3B198752@PhilipOakley>
Date:   Thu, 01 Sep 2016 15:20:57 -0700
In-Reply-To: <1BC836ACA8C741AD9732122B3B198752@PhilipOakley> (Philip Oakley's
        message of "Thu, 1 Sep 2016 21:48:14 +0100")
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"Philip Oakley" <philipoakley@iee.org> writes:

> The user question was, given a commit 'J', and a future commit 'H'
> (typically a branch tip such as 'master'), find those commits that are
> :
> A) merges
> B) on the first parent DAG chain of the future commit 'H'
> C) children of the given commit 'J'

The answer then is that there is no such single step operation.

In the picture, if D or E were a merge from a side branch that does
not have anything to do with 'J', "log --first-parent --merges" will
not exclude it (i.e. C won't be fulfilled by --first-parent --merges).