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From: Derrick Stolee <stolee@gmail.com>
To: Elijah Newren <newren@gmail.com>,
	Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>
Cc: "Git Mailing List" <git@vger.kernel.org>,
	"Junio C Hamano" <gitster@pobox.com>,
	"Matheus Tavares Bernardino" <matheus.bernardino@usp.br>,
	"Johannes Schindelin" <Johannes.Schindelin@gmx.de>,
	"Eric Sunshine" <sunshine@sunshineco.com>,
	"René Scharfe" <l.s.r@web.de>,
	"Derrick Stolee" <derrickstolee@github.com>,
	"Derrick Stolee" <dstolee@microsoft.com>
Subject: Re: [PATCH v4 04/10] sparse-index: use WRITE_TREE_MISSING_OK
Date: Mon, 30 Aug 2021 09:19:15 -0400	[thread overview]
Message-ID: <2870fcb8-a356-c2c2-d084-b560326e1ad4@gmail.com> (raw)
In-Reply-To: <CABPp-BFcySug2kSvxT7YdJ1Oorza5AfxKPJgMBE2wN8qOw+=Eg@mail.gmail.com>

On 8/27/2021 5:33 PM, Elijah Newren wrote:
> On Tue, Aug 24, 2021 at 2:51 PM Derrick Stolee via GitGitGadget
> <gitgitgadget@gmail.com> wrote:
>>
>> From: Derrick Stolee <dstolee@microsoft.com>
>>
>> When updating the cache tree in convert_to_sparse(), the
>> WRITE_TREE_MISSING_OK flag indicates that trees might be computed that
>> do not already exist within the object database.
> 
> Okay.
> 
>> This happens in cases
>> such as 'git add' creating new trees that it wants to store in
>> anticipation of a following 'git commit'.
> 
> This doesn't make any sense to me.  Does 'git add' call
> convert_to_sparse()?  I don't see why it would; wouldn't the calls to
> convert_to_sparse() come via sparse-checkout init/set commands?  If
> I'm correct on that, and 'git add' wants to create new trees, then by
> the time convert_to_sparse() is called in some subsequent git
> operation, then convert_to_sparse would already have the trees it
> needs.

If someone adds a change outside the sparse-checkout cone, then the
index is expanded in-memory, then is converted to sparse when the
index is written again.

> I thought the reason you would need this is someone modified and
> staged a change to a file underneath a directory that will be
> sparsified away; at the time of convert_to_sparse(), a tree object may
> not have yet been written for the new tree with the newly modified
> file (because those tend to be written at commit time), but you'd need
> it at the time you sparsified.

Yes. I think we are trying to say the same thing.

Thanks,
-Stolee

  reply	other threads:[~2021-08-30 13:19 UTC|newest]

Thread overview: 92+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-29 17:27 [PATCH 0/2] Sparse index: delete ignored files outside sparse cone Derrick Stolee via GitGitGadget
2021-07-29 17:27 ` [PATCH 1/2] t7519: rewrite sparse index test Derrick Stolee via GitGitGadget
2021-07-29 17:27 ` [PATCH 2/2] sparse-checkout: clear tracked sparse dirs Derrick Stolee via GitGitGadget
2021-07-30 13:52   ` Elijah Newren
2021-08-02 14:34     ` Derrick Stolee
2021-08-02 16:17       ` Elijah Newren
2021-08-05  1:55         ` Derrick Stolee
2021-08-05  3:54           ` Elijah Newren
2021-07-30 13:11 ` [PATCH 0/2] Sparse index: delete ignored files outside sparse cone Elijah Newren
2021-08-10 19:50 ` [PATCH v2 0/8] " Derrick Stolee via GitGitGadget
2021-08-10 19:50   ` [PATCH v2 1/8] t7519: rewrite sparse index test Derrick Stolee via GitGitGadget
2021-08-10 19:50   ` [PATCH v2 2/8] sparse-index: silently return when not using cone-mode patterns Derrick Stolee via GitGitGadget
2021-08-10 19:50   ` [PATCH v2 3/8] sparse-index: silently return when cache tree fails Derrick Stolee via GitGitGadget
2021-08-19 18:24     ` Elijah Newren
2021-08-20 15:04       ` Derrick Stolee
2021-08-10 19:50   ` [PATCH v2 4/8] unpack-trees: fix nested sparse-dir search Derrick Stolee via GitGitGadget
2021-08-10 19:50   ` [PATCH v2 5/8] sparse-checkout: create helper methods Derrick Stolee via GitGitGadget
2021-08-12 17:29     ` Derrick Stolee
2021-08-10 19:50   ` [PATCH v2 6/8] attr: be careful about sparse directories Derrick Stolee via GitGitGadget
2021-08-10 19:50   ` [PATCH v2 7/8] sparse-index: add SPARSE_INDEX_IGNORE_CONFIG flag Derrick Stolee via GitGitGadget
2021-08-10 19:50   ` [PATCH v2 8/8] sparse-checkout: clear tracked sparse dirs Derrick Stolee via GitGitGadget
2021-08-17 13:23   ` [PATCH v3 0/8] Sparse index: delete ignored files outside sparse cone Derrick Stolee via GitGitGadget
2021-08-17 13:23     ` [PATCH v3 1/8] t7519: rewrite sparse index test Derrick Stolee via GitGitGadget
2021-08-19  7:45       ` Johannes Schindelin
2021-08-20 15:09         ` Derrick Stolee
2021-08-20 16:40           ` Eric Sunshine
2021-08-17 13:23     ` [PATCH v3 2/8] sparse-index: silently return when not using cone-mode patterns Derrick Stolee via GitGitGadget
2021-08-17 13:23     ` [PATCH v3 3/8] sparse-index: silently return when cache tree fails Derrick Stolee via GitGitGadget
2021-08-17 13:23     ` [PATCH v3 4/8] unpack-trees: fix nested sparse-dir search Derrick Stolee via GitGitGadget
2021-08-19  8:01       ` Johannes Schindelin
2021-08-20 15:18         ` Derrick Stolee
2021-08-20 19:35           ` René Scharfe
2021-08-20 20:22             ` René Scharfe
2021-08-19 18:29       ` Elijah Newren
2021-08-17 13:23     ` [PATCH v3 5/8] sparse-checkout: create helper methods Derrick Stolee via GitGitGadget
2021-08-19  8:07       ` Johannes Schindelin
2021-08-20 15:30         ` Derrick Stolee
2021-08-17 13:23     ` [PATCH v3 6/8] attr: be careful about sparse directories Derrick Stolee via GitGitGadget
2021-08-19  8:11       ` Johannes Schindelin
2021-08-20 15:36         ` Derrick Stolee
2021-08-19 20:53       ` Elijah Newren
2021-08-20 15:39         ` Derrick Stolee
2021-08-20 16:05           ` Elijah Newren
2021-08-17 13:23     ` [PATCH v3 7/8] sparse-index: add SPARSE_INDEX_IGNORE_CONFIG flag Derrick Stolee via GitGitGadget
2021-08-18 18:59       ` Derrick Stolee
2021-08-17 13:23     ` [PATCH v3 8/8] sparse-checkout: clear tracked sparse dirs Derrick Stolee via GitGitGadget
2021-08-19  8:48       ` Johannes Schindelin
2021-08-20 15:49         ` Derrick Stolee
2021-08-20 16:15           ` Elijah Newren
2021-08-20 15:56         ` Elijah Newren
2021-08-23 20:00           ` Johannes Schindelin
2021-08-17 14:09     ` [PATCH v3 0/8] Sparse index: delete ignored files outside sparse cone Elijah Newren
2021-08-24 21:51     ` [PATCH v4 00/10] " Derrick Stolee via GitGitGadget
2021-08-24 21:51       ` [PATCH v4 01/10] t7519: rewrite sparse index test Derrick Stolee via GitGitGadget
2021-08-24 21:51       ` [PATCH v4 02/10] sparse-index: silently return when not using cone-mode patterns Derrick Stolee via GitGitGadget
2021-08-24 21:51       ` [PATCH v4 03/10] sparse-index: silently return when cache tree fails Derrick Stolee via GitGitGadget
2021-08-24 21:51       ` [PATCH v4 04/10] sparse-index: use WRITE_TREE_MISSING_OK Derrick Stolee via GitGitGadget
2021-08-27 21:33         ` Elijah Newren
2021-08-30 13:19           ` Derrick Stolee [this message]
2021-08-30 20:08             ` Elijah Newren
2021-08-24 21:51       ` [PATCH v4 05/10] unpack-trees: fix nested sparse-dir search Derrick Stolee via GitGitGadget
2021-08-24 22:21         ` René Scharfe
2021-08-25  1:09           ` Derrick Stolee
2021-08-24 21:51       ` [PATCH v4 06/10] sparse-checkout: create helper methods Derrick Stolee via GitGitGadget
2021-08-24 21:51       ` [PATCH v4 07/10] attr: be careful about sparse directories Derrick Stolee via GitGitGadget
2021-08-24 21:51       ` [PATCH v4 08/10] sparse-index: add SPARSE_INDEX_MEMORY_ONLY flag Derrick Stolee via GitGitGadget
2021-08-24 21:51       ` [PATCH v4 09/10] sparse-checkout: clear tracked sparse dirs Derrick Stolee via GitGitGadget
2021-08-24 21:51       ` [PATCH v4 10/10] sparse-checkout: add config to disable deleting dirs Derrick Stolee via GitGitGadget
2021-08-27 20:58         ` Elijah Newren
2021-08-30 13:30           ` Derrick Stolee
2021-08-30 20:11             ` Elijah Newren
2021-08-27 21:56       ` [PATCH v4 00/10] Sparse index: delete ignored files outside sparse cone Elijah Newren
2021-08-27 22:01         ` Elijah Newren
2021-08-30 13:34           ` Derrick Stolee
2021-08-30 20:14             ` Elijah Newren
2021-08-30 13:54         ` Derrick Stolee
2021-08-30 20:23           ` Elijah Newren
2021-09-08  1:42       ` [PATCH v5 0/9] " Derrick Stolee via GitGitGadget
2021-09-08  1:42         ` [PATCH v5 1/9] t7519: rewrite sparse index test Derrick Stolee via GitGitGadget
2021-09-08  1:42         ` [PATCH v5 2/9] sparse-index: silently return when not using cone-mode patterns Derrick Stolee via GitGitGadget
2021-09-08  1:42         ` [PATCH v5 3/9] unpack-trees: fix nested sparse-dir search Derrick Stolee via GitGitGadget
2021-09-08  1:42         ` [PATCH v5 4/9] sparse-index: silently return when cache tree fails Derrick Stolee via GitGitGadget
2021-09-08  1:42         ` [PATCH v5 5/9] sparse-index: use WRITE_TREE_MISSING_OK Derrick Stolee via GitGitGadget
2021-09-08  1:42         ` [PATCH v5 6/9] sparse-checkout: create helper methods Derrick Stolee via GitGitGadget
2021-09-08  1:42         ` [PATCH v5 7/9] attr: be careful about sparse directories Derrick Stolee via GitGitGadget
2021-09-08  1:42         ` [PATCH v5 8/9] sparse-index: add SPARSE_INDEX_MEMORY_ONLY flag Derrick Stolee via GitGitGadget
2021-09-08  1:42         ` [PATCH v5 9/9] sparse-checkout: clear tracked sparse dirs Derrick Stolee via GitGitGadget
2021-09-08  5:21         ` [PATCH v5 0/9] Sparse index: delete ignored files outside sparse cone Junio C Hamano
2021-09-08  6:56           ` Junio C Hamano
2021-09-08 11:39             ` Derrick Stolee
2021-09-08 16:11               ` Junio C Hamano
2021-09-08  5:30         ` Elijah Newren

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