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From:   Junio C Hamano <gitster@pobox.com>
To:     SZEDER =?utf-8?Q?G=C3=A1bor?= <szeder.dev@gmail.com>
Cc:     Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>,
        git@vger.kernel.org, newren@gmail.com, pclouds@gmail.com,
        jrnieder@gmail.com,
        Martin =?utf-8?Q?=C3=85gren?= <martin.agren@gmail.com>,
        Derrick Stolee <stolee@gmail.com>,
        =?utf-8?B?w4Z2YXIgQXJuZmrDtnLDsA==?= Bjarmason <avarab@gmail.com>,
        Derrick Stolee <derrickstolee@github.com>,
        Derrick Stolee <dstolee@microsoft.com>
Subject: Re: [PATCH v4 01/20] sparse-index: design doc and format update
References: <pull.883.v3.git.1615912983.gitgitgadget@gmail.com>
        <pull.883.v4.git.1616507069.gitgitgadget@gmail.com>
        <6426a5c60e53e30091360c00c61c9123803fe9c1.1616507069.git.gitgitgadget@gmail.com>
        <20210326202940.GC2271@szeder.dev>
Date:   Sat, 27 Mar 2021 18:47:11 -0700
In-Reply-To: <20210326202940.GC2271@szeder.dev> ("SZEDER =?utf-8?Q?G=C3=A1?=
 =?utf-8?Q?bor=22's?= message of
        "Fri, 26 Mar 2021 21:29:40 +0100")
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SZEDER G=C3=A1bor <szeder.dev@gmail.com> writes:

>> +To start, we use a new repository extension, `extensions.sparseIndex`=
, to
>> +allow inserting sparse-directory entries into indexes with file forma=
t
>> +versions 2, 3, and 4. This prevents Git versions that do not understa=
nd
>> +the sparse-index from operating on one, but it also prevents other
>> +operations that do not use the index at all.
>
> Why is this not a non-optional index extension?  ...
> This really should be a non-optional index extension.

Yeah, the index extension mechanism was designed with optional and
required kinds because we wanted to support exactly a use case like
this one.

Thanks for pointing it out.