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From: Junio C Hamano <gitster@pobox.com>
To: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Cc: git@vger.kernel.org, Conrad Irwin <conrad.irwin@gmail.com>,
	Sitaram Chamarty <sitaramc@gmail.com>,
	Michael J Gruber <git@drmicha.warpmail.net>,
	Nguyen Thai Ngoc Duy <pclouds@gmail.com>,
	Jeff King <peff@peff.net>,
	"Brian M . Carlson" <sandals@crustytoothpaste.net>
Subject: Re: [PATCH v2 3/3] rev-parse: match ^{<type>} case-insensitively
Date: Sun, 26 Mar 2017 17:36:21 -0700
Message-ID: <xmqq60iv4ku2.fsf@gitster.mtv.corp.google.com> (raw)
In-Reply-To: <20170326121654.22035-4-avarab@gmail.com>

Ævar Arnfjörð Bjarmason  <avarab@gmail.com> writes:

> Change the revision parsing logic to match ^{commit}, ^{tree}, ^{blob}
> etc. case-insensitively.
>
> Before this change supplying anything except the lower-case forms
> emits an "unknown revision or path not in the working tree"
> error. This change makes upper-case & mixed-case versions equivalent
> to the lower-case versions.
>
> The rationale for this change is the same as for making @{upstream}
> and related suffixes case-insensitive in "rev-parse: match
> @{upstream}, @{u} and @{push} case-insensitively", but unlike those
> suffixes this change introduces the potential confusion of accepting
> TREE or BLOB here, but not as an argument to e.g. "cat-file -t <type>"
> or "hash-object -t <type>".

It's not "potential confusion".  This closes the door for us to
introduce "TREE" as a separate object type in the future.

If we agree to make a declaration that all typenames are officially
spelled in lowercase [*1*] and at the UI level we accept typenames
spelled in any case, then we can adopt this change (and then we need
to update "cat-file -t" etc. to match it).

I do not at all mind to see if the list concensus is to make such a
declaration and permanently close the door for typenames that are
not lowercase, and after seeing such a concensus I'd gladly
appreciate this patch, but I do not want to see a change like this
that decides the future of the system, pretending as an innocuous
change, sneaked in without making sure that everybody is aware of
its implications.


[Footnote]

*1* "officially spelled in lowercase" is necessary to avoid
    confusion, because we are not making typenames case insensitive,
    allowing an object whose raw-bytes in its loose object
    representation before deflating begins with "COMMIT" and take it
    as an object of <commit> type.  Instead, such a declaration will
    make such an object an invalid one (as opposed to "object of an
    unknown type", as it currently is).


  reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-18 22:34 [PATCH] rev-parse: match @{u}, @{push} and " Ævar Arnfjörð Bjarmason
2017-03-19  9:19 ` Duy Nguyen
2017-03-19 10:04   ` Ævar Arnfjörð Bjarmason
2017-03-19 12:55 ` Junio C Hamano
2017-03-19 14:26   ` Ævar Arnfjörð Bjarmason
2017-03-19 22:53     ` Junio C Hamano
2017-03-26 12:16       ` [PATCH v2 0/3] rev-parse case insensitivity & @{p} synonym Ævar Arnfjörð Bjarmason
2017-03-26 12:16       ` [PATCH v2 1/3] rev-parse: match @{upstream}, @{u} and @{push} case-insensitively Ævar Arnfjörð Bjarmason
2017-03-27  0:27         ` Junio C Hamano
2017-03-27 11:16           ` [PATCH v3] " Ævar Arnfjörð Bjarmason
2017-03-27 17:45             ` Junio C Hamano
2017-03-27 18:05               ` Ævar Arnfjörð Bjarmason
2017-03-26 12:16       ` [PATCH v2 2/3] rev-parse: add @{p} as a synonym for @{push} Ævar Arnfjörð Bjarmason
2017-03-27  2:53         ` Jeff King
2017-03-27  7:52           ` Ævar Arnfjörð Bjarmason
2017-03-26 12:16       ` [PATCH v2 3/3] rev-parse: match ^{<type>} case-insensitively Ævar Arnfjörð Bjarmason
2017-03-27  0:36         ` Junio C Hamano [this message]
2017-03-27  2:58           ` Jeff King
2017-03-27  5:39             ` Junio C Hamano
2017-03-27  7:11               ` Jeff King
2017-03-27  7:33             ` Ævar Arnfjörð Bjarmason
2017-03-21 19:19 ` [PATCH] rev-parse: match @{u}, @{push} and " Ævar Arnfjörð Bjarmason
2017-03-21 19:26   ` Junio C Hamano
2017-03-21 19:43   ` Jeff King

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