From: Junio C Hamano <gitster@pobox.com>
Date: Fri, 07 Apr 2023 21:35:09 GMT
Subject: Re: [PATCH] mailmap: change primary address for Emily Shaffer
Message-ID: <xmqq5ya7jrzm.fsf@gitster.g>
In-Reply-To: <20230407212249.1541509-1-nasamuffin@google.com>

emilyshaffer@google.com writes:

> From:   emilyshaffer@google.com
> Subject: [PATCH] mailmap: change primary address for Emily Shaffer
>
> Emily finally figured out how to set up their alias at DayJob, and would
> prefer to use nasamuffin@google.com, partially to reduce confusion
> between IRC and list, and partially because they just like the alias a
> lot more.
>
> Signed-off-by: Emily Shaffer <nasamuffin@google.com>
> ---
>  .mailmap | 1 +
>  1 file changed, 1 insertion(+)

Cute.  By telling the machinery to map "<emilyshaffer@google.com>"
(with any name) to "Emily Shaffer <nasamuffin@google.com>", and
using a nameless <emilyshaffer@google.com> as the sender for the
mail to add such a mailmap entry, the result of applying such a
patch, even though the underlying commit object created lacks the
human-readable name, like so:

    $ git cat-file commit HEAD
    tree cec72ed0d4fb9faa44cd8d23008f90da3239808b
    parent 0607f793cbe0af16aee6d2480056d891835884bd
    author emilyshaffer@google.com <emilyshaffer@google.com> 1680902569 -0700
    committer Junio C Hamano <gitster@pobox.com> 1680902794 -0700

    mailmap: change primary address for Emily Shaffer
    ...

would show with a substituted author:

    $ git show HEAD
    commit 2485a52e4b4419020286e98dd04c0e5ebb218f06
    Author: Emily Shaffer <nasamuffin@google.com>
    Date:   Fri Apr 7 14:22:49 2023 -0700

        mailmap: change primary address for Emily Shaffer
        ...    

I'll amend the commit to record the nasammuffin name instead,
though.