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From: Junio C Hamano <gitster@pobox.com>
To: Derrick Stolee <stolee@gmail.com>
Cc: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
	"Elijah Newren" <newren@gmail.com>,
	"Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com>,
	"Git Mailing List" <git@vger.kernel.org>,
	"Victoria Dye" <vdye@github.com>,
	"Derrick Stolee" <derrickstolee@github.com>,
	"Derrick Stolee" <dstolee@microsoft.com>
Subject: Re: [PATCH 2/2] ls-files: add --sparse option
Date: Mon, 13 Dec 2021 11:16:22 -0800	[thread overview]
Message-ID: <xmqq7dc8co3d.fsf@gitster.g> (raw)
In-Reply-To: <745e79e3-521d-58bd-2ddf-1da4e0f6fe26@gmail.com> (Derrick Stolee's message of "Fri, 10 Dec 2021 08:57:29 -0500")

Derrick Stolee <stolee@gmail.com> writes:

> You're talking about this hunk, right?
>
> if test -z "$GIT_TEST_CMP"
> then
> 	if test -n "$GIT_TEST_CMP_USE_COPIED_CONTEXT"
> 	then
> 		GIT_TEST_CMP="$DIFF -c"
> 	else
> 		GIT_TEST_CMP="$DIFF -u"
> 	fi
> fi
>
> This only switches from "diff -u" to "diff -c" if the
> GIT_TEST_CMP_USE_COPIED_CONTEXT variable is set, but it is not set
> by default. Thus, we are using "diff -u" by default throughout.

That it can be set merely means that somebody needed to work around
the lack of "-u" format in their implementation of "diff".  It came
to POSIX only at the Issue 7 of the standard (cf. [*1*]).

Unconditional use of "diff -u" is a breaking change for them.

If these people still exist, that is ;-)


[Reference]

*1* https://pubs.opengroup.org/onlinepubs/9699919799/utilities/diff.html
The Open Group Base Specifications Issue 7, 2018 edition

  parent reply	other threads:[~2021-12-13 19:16 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-16 15:38 [PATCH 0/2] Sparse index: fetch, pull, ls-files Derrick Stolee via GitGitGadget
2021-11-16 15:38 ` [PATCH 1/2] fetch/pull: use the sparse index Derrick Stolee via GitGitGadget
2021-11-16 15:38 ` [PATCH 2/2] ls-files: add --sparse option Derrick Stolee via GitGitGadget
2021-11-22 18:36   ` Elijah Newren
2021-11-22 19:44     ` Derrick Stolee
2021-11-23  2:07   ` Ævar Arnfjörð Bjarmason
2021-12-08 15:14     ` Derrick Stolee
2021-12-08 15:20       ` Derrick Stolee
2021-12-08 17:04       ` Elijah Newren
2021-12-08 18:23         ` Derrick Stolee
2021-12-08 18:36           ` Elijah Newren
2021-12-08 19:06             ` Derrick Stolee
2021-12-09 12:50               ` Ævar Arnfjörð Bjarmason
2021-12-10 13:57                 ` Derrick Stolee
2021-12-10 15:13                   ` Ævar Arnfjörð Bjarmason
2021-12-13 19:16                   ` Junio C Hamano [this message]
2021-12-16 14:11                     ` Derrick Stolee
2021-11-17  9:29 ` [PATCH 0/2] Sparse index: fetch, pull, ls-files Junio C Hamano
2021-11-17 15:28   ` Derrick Stolee
2021-11-18 22:13     ` Junio C Hamano
2021-11-23  1:57 ` Ævar Arnfjörð Bjarmason
2021-12-08 19:39 ` [PATCH v2 0/5] " Derrick Stolee via GitGitGadget
2021-12-08 19:39   ` [PATCH v2 1/5] fetch/pull: use the sparse index Derrick Stolee via GitGitGadget
2021-12-08 19:39   ` [PATCH v2 2/5] ls-files: add --sparse option Derrick Stolee via GitGitGadget
2021-12-09  5:08     ` Elijah Newren
2021-12-10 13:51       ` Derrick Stolee
2021-12-08 19:39   ` [PATCH v2 3/5] t1092: replace 'read-cache --table' with 'ls-files --sparse' Derrick Stolee via GitGitGadget
2021-12-09  5:19     ` Elijah Newren
2021-12-08 19:39   ` [PATCH v2 4/5] t1091/t3705: remove 'test-tool read-cache --table' Derrick Stolee via GitGitGadget
2021-12-09  5:20     ` Elijah Newren
2021-12-08 19:39   ` [PATCH v2 5/5] test-read-cache: remove --table, --expand options Derrick Stolee via GitGitGadget
2021-12-09  5:23   ` [PATCH v2 0/5] Sparse index: fetch, pull, ls-files Elijah Newren
2021-12-10 15:13   ` [PATCH v3 " Derrick Stolee via GitGitGadget
2021-12-10 15:13     ` [PATCH v3 1/5] fetch/pull: use the sparse index Derrick Stolee via GitGitGadget
2021-12-10 15:13     ` [PATCH v3 2/5] ls-files: add --sparse option Derrick Stolee via GitGitGadget
2021-12-10 15:13     ` [PATCH v3 3/5] t1092: replace 'read-cache --table' with 'ls-files --sparse' Derrick Stolee via GitGitGadget
2021-12-10 15:13     ` [PATCH v3 4/5] t1091/t3705: remove 'test-tool read-cache --table' Derrick Stolee via GitGitGadget
2021-12-10 15:13     ` [PATCH v3 5/5] test-read-cache: remove --table, --expand options Derrick Stolee via GitGitGadget
2021-12-10 16:16     ` [PATCH v3 0/5] Sparse index: fetch, pull, ls-files Ævar Arnfjörð Bjarmason
2021-12-10 18:45       ` Elijah Newren
2021-12-11  2:24         ` Ævar Arnfjörð Bjarmason
2021-12-11  4:45           ` Elijah Newren
2021-12-10 18:53     ` Elijah Newren
2021-12-22 14:20     ` [PATCH v4 " Derrick Stolee via GitGitGadget
2021-12-22 14:20       ` [PATCH v4 1/5] fetch/pull: use the sparse index Derrick Stolee via GitGitGadget
2021-12-22 14:20       ` [PATCH v4 2/5] ls-files: add --sparse option Derrick Stolee via GitGitGadget
2021-12-22 14:20       ` [PATCH v4 3/5] t1092: replace 'read-cache --table' with 'ls-files --sparse' Derrick Stolee via GitGitGadget
2021-12-22 14:20       ` [PATCH v4 4/5] t1091/t3705: remove 'test-tool read-cache --table' Derrick Stolee via GitGitGadget
2021-12-22 14:20       ` [PATCH v4 5/5] test-read-cache: remove --table, --expand options Derrick Stolee via GitGitGadget
2021-12-22 19:17       ` [PATCH v4 0/5] Sparse index: fetch, pull, ls-files Elijah Newren
2021-12-22 23:56         ` Junio C Hamano

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