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From: Derrick Stolee <stolee@gmail.com>
To: SZEDER Gábor <szeder.dev@gmail.com>,
	Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, newren@gmail.com,
	Derrick Stolee <dstolee@microsoft.com>,
	Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH v4 15/17] sparse-checkout: update working directory in-process
Date: Mon, 21 Oct 2019 07:59:32 -0400
Message-ID: <2dd417e0-2fc6-67ca-68c5-e9afceb7e496@gmail.com> (raw)
In-Reply-To: <20191018204032.GK29845@szeder.dev>

On 10/18/2019 4:40 PM, SZEDER Gábor wrote:
> On Fri, Oct 18, 2019 at 10:24:21PM +0200, SZEDER Gábor wrote:
>> On Tue, Oct 15, 2019 at 01:56:02PM +0000, Derrick Stolee via GitGitGadget wrote:
>>> From: Derrick Stolee <dstolee@microsoft.com>
>>>
>>> The sparse-checkout builtin used 'git read-tree -mu HEAD' to update the
>>> skip-worktree bits in the index and to update the working directory.
>>> This extra process is overly complex, and prone to failure. It also
>>> requires that we write our changes to the sparse-checkout file before
>>> trying to update the index.
>>>
>>> Remove this extra process call by creating a direct call to
>>> unpack_trees() in the same way 'git read-tree -mu HEAD' does. In
>>> addition, provide an in-memory list of patterns so we can avoid
>>> reading from the sparse-checkout file. This allows us to test a
>>> proposed change to the file before writing to it.
>>
>> Starting with this patch there is an issue with locking the index:
>>
>>   $ git init
>>   Initialized empty Git repository in /home/szeder/src/git/tmp/SC/.git/
>>   $ >file
> 
>   $ git add file
> 
> Forgot to copy that command...
> 
>>   $ git commit -m initial
>>   [master (root-commit) 5d80b9c] initial
>>    1 file changed, 0 insertions(+), 0 deletions(-)
>>    create mode 100644 file
>>   $ ls .git/index.lock
>>   ls: cannot access '.git/index.lock': No such file or directory
>>   $ git sparse-checkout set nope
>>   warning: core.sparseCheckout is disabled, so changes to the sparse-checkout file will have no effect
>>   warning: run 'git sparse-checkout init' to enable the sparse-checkout feature
>>   error: Sparse checkout leaves no entry on working directory
>>   fatal: Unable to create '/home/szeder/src/git/tmp/SC/.git/index.lock':
>>   File exists.
>>
>>   Another git process seems to be running in this repository, e.g.
>>   an editor opened by 'git commit'. Please make sure all processes
>>   are terminated then try again. If it still fails, a git process
>>   may have crashed in this repository earlier:
>>   remove the file manually to continue.
>>   $ ls .git/index.lock
>>   ls: cannot access '.git/index.lock': No such file or directory
> 
> I would add that building the previous patch and running the same
> sequence of commands works, in the sense that 'git sparse-checkout
> set' writes the non-existing filename to the 'sparse-checkout' file
> and it prints the same two warnings, and doesn't (seem to) attempt to
> update the working tree and the index.

Thank you for catching this! The issue is that I was not rolling the
index back on this kind of failed update, and then trying to replay
the "old" sparse-checkout hit the existing .git/index.lock file.

Here is the test I added that breaks on the current patch, but
passes when adding a rollback_lock_file() call:

test_expect_success 'revert to old sparse-checkout on empty update' '
	git init empty-test &&
	(
		echo >file &&
		git add file &&
		git commit -m "test" &&
		test_must_fail git sparse-checkout set nothing 2>err &&
		test_i18ngrep "Sparse checkout leaves no entry on working directory" err &&
		test_i18ngrep ! ".git/index.lock" err &&
		git sparse-checkout set file
	)
'

It also has the following problem: because we are setting the
patterns in-memory, this update acts like core.sparseCheckout is
enabled, even when it is not. So, I'm finally convinced that
the 'set' command should enable the config setting if it is
called even without 'init'.

Thanks,
-Stolee


  reply index

Thread overview: 196+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-20 15:11 [PATCH 0/9] [RFC] New sparse-checkout builtin and "cone" mode Derrick Stolee via GitGitGadget
2019-08-20 15:11 ` [PATCH 1/9] sparse-checkout: create builtin with 'list' subcommand Derrick Stolee via GitGitGadget
2019-08-23 22:30   ` Elijah Newren
2019-08-20 15:11 ` [PATCH 2/9] sparse-checkout: create 'init' subcommand Derrick Stolee via GitGitGadget
2019-08-23 23:02   ` Elijah Newren
2019-09-11 14:27     ` Derrick Stolee
2019-09-11 20:28     ` Derrick Stolee
2019-08-20 15:11 ` [PATCH 3/9] clone: add --sparse mode Derrick Stolee via GitGitGadget
2019-08-23 23:17   ` Elijah Newren
2019-09-18 13:51     ` Derrick Stolee
2019-08-20 15:11 ` [PATCH 4/9] sparse-checkout: 'add' subcommand Derrick Stolee via GitGitGadget
2019-08-23 23:30   ` Elijah Newren
2019-09-18 13:55     ` Derrick Stolee
2019-09-18 14:56       ` Elijah Newren
2019-09-18 17:23         ` Derrick Stolee
2019-08-20 15:11 ` [PATCH 6/9] trace2:experiment: clear_ce_flags_1 Jeff Hostetler via GitGitGadget
2019-08-24  0:08   ` Elijah Newren
2019-08-20 15:11 ` [PATCH 5/9] sparse-checkout: create 'disable' subcommand Derrick Stolee via GitGitGadget
2019-08-23 23:50   ` Elijah Newren
2019-08-20 15:11 ` [PATCH 7/9] sparse-checkout: add 'cone' mode Derrick Stolee via GitGitGadget
2019-08-24  0:31   ` Elijah Newren
2019-08-20 15:11 ` [PATCH 8/9] sparse-checkout: use hashmaps for cone patterns Derrick Stolee via GitGitGadget
2019-08-24  4:56   ` Elijah Newren
2019-08-20 15:11 ` [PATCH 9/9] sparse-checkout: init and add in cone mode Derrick Stolee via GitGitGadget
2019-08-24  5:07   ` Elijah Newren
2019-08-21 21:52 ` [PATCH 0/9] [RFC] New sparse-checkout builtin and "cone" mode Elijah Newren
2019-08-22 13:10   ` Derrick Stolee
2019-08-22 14:25     ` Derrick Stolee
2019-08-24  5:40     ` Elijah Newren
2019-08-26 13:29       ` Derrick Stolee
2019-08-26 18:16         ` Elijah Newren
2019-08-26 19:16           ` Derrick Stolee
2019-09-02 17:55       ` Eric Sunshine
2019-09-19 14:43 ` [PATCH v2 00/11] " Derrick Stolee via GitGitGadget
2019-09-19 14:43   ` [PATCH v2 01/11] sparse-checkout: create builtin with 'list' subcommand Derrick Stolee via GitGitGadget
2019-10-05 19:22     ` Elijah Newren
2019-09-19 14:43   ` [PATCH v2 02/11] sparse-checkout: create 'init' subcommand Derrick Stolee via GitGitGadget
2019-10-05 19:34     ` Elijah Newren
2019-09-19 14:43   ` [PATCH v2 03/11] clone: add --sparse mode Derrick Stolee via GitGitGadget
2019-10-05 19:40     ` Elijah Newren
2019-10-07 13:56       ` Derrick Stolee
2019-09-19 14:43   ` [PATCH v2 05/11] sparse-checkout: add '--stdin' option to set subcommand Derrick Stolee via GitGitGadget
2019-09-19 14:43   ` [PATCH v2 04/11] sparse-checkout: 'set' subcommand Derrick Stolee via GitGitGadget
2019-10-05 22:44     ` Elijah Newren
2019-10-06  0:30       ` Elijah Newren
2019-10-07 18:26         ` Derrick Stolee
2019-10-11 22:24           ` Elijah Newren
2019-09-19 14:43   ` [PATCH v2 06/11] sparse-checkout: create 'disable' subcommand Derrick Stolee via GitGitGadget
2019-10-06  4:10     ` Elijah Newren
2019-10-07 19:12       ` Derrick Stolee
2019-09-19 14:43   ` [PATCH v2 07/11] trace2: add region in clear_ce_flags Jeff Hostetler via GitGitGadget
2019-10-06  4:13     ` Elijah Newren
2019-09-19 14:43   ` [PATCH v2 08/11] sparse-checkout: add 'cone' mode Derrick Stolee via GitGitGadget
2019-10-06  4:22     ` Elijah Newren
2019-10-07 19:15       ` Derrick Stolee
2019-09-19 14:43   ` [PATCH v2 09/11] sparse-checkout: use hashmaps for cone patterns Derrick Stolee via GitGitGadget
2019-09-19 20:59     ` Derrick Stolee
2019-09-20 14:37       ` Derrick Stolee
2019-09-19 14:43   ` [PATCH v2 10/11] sparse-checkout: init and set in cone mode Derrick Stolee via GitGitGadget
2019-09-19 14:43   ` [PATCH v2 11/11] unpack-trees: hash less " Derrick Stolee via GitGitGadget
2019-10-01 13:40   ` [PATCH v2 00/11] New sparse-checkout builtin and "cone" mode Derrick Stolee
2019-10-01 16:54     ` Elijah Newren
2019-10-01 18:15       ` Derrick Stolee
2019-10-03 22:28     ` Junio C Hamano
2019-10-07 20:08   ` [PATCH v3 00/17] " Derrick Stolee via GitGitGadget
2019-10-07 20:08     ` [PATCH v3 01/17] sparse-checkout: create builtin with 'list' subcommand Derrick Stolee via GitGitGadget
2019-10-11 22:01       ` Elijah Newren
2019-10-07 20:08     ` [PATCH v3 02/17] sparse-checkout: create 'init' subcommand Derrick Stolee via GitGitGadget
2019-10-11 22:14       ` Elijah Newren
2019-10-14 20:22         ` Derrick Stolee
2019-10-07 20:08     ` [PATCH v3 03/17] clone: add --sparse mode Derrick Stolee via GitGitGadget
2019-10-11 22:20       ` Elijah Newren
2019-10-07 20:08     ` [PATCH v3 04/17] sparse-checkout: 'set' subcommand Derrick Stolee via GitGitGadget
2019-10-11 22:26       ` Elijah Newren
2019-10-11 22:30         ` Elijah Newren
2019-10-07 20:08     ` [PATCH v3 05/17] sparse-checkout: add '--stdin' option to set subcommand Derrick Stolee via GitGitGadget
2019-10-11 22:27       ` Elijah Newren
2019-10-14 20:28         ` Derrick Stolee
2019-10-07 20:08     ` [PATCH v3 06/17] sparse-checkout: create 'disable' subcommand Derrick Stolee via GitGitGadget
2019-10-07 20:08     ` [PATCH v3 07/17] trace2: add region in clear_ce_flags Jeff Hostetler via GitGitGadget
2019-10-07 20:08     ` [PATCH v3 08/17] sparse-checkout: add 'cone' mode Derrick Stolee via GitGitGadget
2019-10-07 20:08     ` [PATCH v3 09/17] sparse-checkout: use hashmaps for cone patterns Derrick Stolee via GitGitGadget
2019-10-07 20:08     ` [PATCH v3 10/17] sparse-checkout: init and set in cone mode Derrick Stolee via GitGitGadget
2019-10-07 20:08     ` [PATCH v3 11/17] unpack-trees: hash less " Derrick Stolee via GitGitGadget
2019-10-07 20:08     ` [PATCH v3 13/17] read-tree: show progress by default Derrick Stolee via GitGitGadget
2019-10-12 22:16       ` Elijah Newren
2019-10-14 20:31         ` Derrick Stolee
2019-10-07 20:08     ` [PATCH v3 12/17] unpack-trees: add progress to clear_ce_flags() Derrick Stolee via GitGitGadget
2019-10-07 20:08     ` [PATCH v3 14/17] sparse-checkout: sanitize for nested folders Derrick Stolee via GitGitGadget
2019-10-07 20:08     ` [PATCH v3 15/17] sparse-checkout: update working directory in-process Derrick Stolee via GitGitGadget
2019-10-12 22:57       ` Elijah Newren
2019-10-14 20:39         ` Derrick Stolee
2019-10-07 20:08     ` [PATCH v3 16/17] sparse-checkout: write using lockfile Derrick Stolee via GitGitGadget
2019-10-12 22:59       ` Elijah Newren
2019-10-14 20:41         ` Derrick Stolee
2019-10-07 20:08     ` [PATCH v3 17/17] sparse-checkout: cone mode should not interact with .gitignore Derrick Stolee via GitGitGadget
2019-10-12 23:00       ` Elijah Newren
2019-10-12 23:22     ` [PATCH v3 00/17] New sparse-checkout builtin and "cone" mode Elijah Newren
2019-10-15 13:55     ` [PATCH v4 " Derrick Stolee via GitGitGadget
2019-10-15 13:55       ` [PATCH v4 01/17] sparse-checkout: create builtin with 'list' subcommand Derrick Stolee via GitGitGadget
2019-10-16 19:00         ` Elijah Newren
2019-10-21 12:10           ` Derrick Stolee
2019-10-18 16:07         ` SZEDER Gábor
2019-10-21 11:42           ` Derrick Stolee
2019-10-15 13:55       ` [PATCH v4 02/17] sparse-checkout: create 'init' subcommand Derrick Stolee via GitGitGadget
2019-10-15 13:55       ` [PATCH v4 03/17] clone: add --sparse mode Derrick Stolee via GitGitGadget
2019-10-15 13:55       ` [PATCH v4 04/17] sparse-checkout: 'set' subcommand Derrick Stolee via GitGitGadget
2019-10-15 13:55       ` [PATCH v4 05/17] sparse-checkout: add '--stdin' option to set subcommand Derrick Stolee via GitGitGadget
2019-10-15 13:55       ` [PATCH v4 06/17] sparse-checkout: create 'disable' subcommand Derrick Stolee via GitGitGadget
2019-10-18 16:31         ` SZEDER Gábor
2019-10-15 13:55       ` [PATCH v4 07/17] trace2: add region in clear_ce_flags Jeff Hostetler via GitGitGadget
2019-10-15 13:55       ` [PATCH v4 08/17] sparse-checkout: add 'cone' mode Derrick Stolee via GitGitGadget
2019-10-15 13:55       ` [PATCH v4 09/17] sparse-checkout: use hashmaps for cone patterns Derrick Stolee via GitGitGadget
2019-10-18 15:31         ` SZEDER Gábor
2019-10-21 11:44           ` Derrick Stolee
2019-10-15 13:55       ` [PATCH v4 10/17] sparse-checkout: init and set in cone mode Derrick Stolee via GitGitGadget
2019-10-15 13:55       ` [PATCH v4 11/17] unpack-trees: hash less " Derrick Stolee via GitGitGadget
2019-10-15 13:55       ` [PATCH v4 12/17] unpack-trees: add progress to clear_ce_flags() Derrick Stolee via GitGitGadget
2019-10-15 13:56       ` [PATCH v4 13/17] read-tree: show progress by default Derrick Stolee via GitGitGadget
2019-10-15 13:56       ` [PATCH v4 14/17] sparse-checkout: sanitize for nested folders Derrick Stolee via GitGitGadget
2019-10-15 13:56       ` [PATCH v4 15/17] sparse-checkout: update working directory in-process Derrick Stolee via GitGitGadget
2019-10-18 20:24         ` SZEDER Gábor
2019-10-18 20:40           ` SZEDER Gábor
2019-10-21 11:59             ` Derrick Stolee [this message]
2019-10-15 13:56       ` [PATCH v4 16/17] sparse-checkout: write using lockfile Derrick Stolee via GitGitGadget
2019-10-15 13:56       ` [PATCH v4 17/17] sparse-checkout: cone mode should not interact with .gitignore Derrick Stolee via GitGitGadget
2019-10-16 20:07       ` [PATCH v4 00/17] New sparse-checkout builtin and "cone" mode Elijah Newren
2019-10-17 23:53       ` Jon Simons
2019-10-21 12:08         ` Derrick Stolee
2019-10-21 13:56       ` [PATCH v5 " Derrick Stolee via GitGitGadget
2019-10-21 13:56         ` [PATCH v5 01/17] sparse-checkout: create builtin with 'list' subcommand Derrick Stolee via GitGitGadget
2019-11-19 22:51           ` SZEDER Gábor
2019-10-21 13:56         ` [PATCH v5 02/17] sparse-checkout: create 'init' subcommand Derrick Stolee via GitGitGadget
2019-11-19 14:33           ` SZEDER Gábor
2019-11-20 14:13             ` SZEDER Gábor
2019-11-21 11:49           ` SZEDER Gábor
2019-11-21 12:34             ` SZEDER Gábor
2019-11-21 14:28             ` Derrick Stolee
2019-11-21 15:27               ` SZEDER Gábor
2019-11-21 15:36                 ` Derrick Stolee
2019-11-21 16:37                   ` SZEDER Gábor
2019-11-21 17:01                     ` Elijah Newren
2019-11-21 17:15                       ` Derrick Stolee
2019-10-21 13:56         ` [PATCH v5 03/17] clone: add --sparse mode Derrick Stolee via GitGitGadget
2019-10-21 13:56         ` [PATCH v5 04/17] sparse-checkout: 'set' subcommand Derrick Stolee via GitGitGadget
2019-11-19 15:46           ` SZEDER Gábor
2019-11-21 13:04             ` Derrick Stolee
2019-11-21 13:36               ` SZEDER Gábor
2019-10-21 13:56         ` [PATCH v5 05/17] sparse-checkout: add '--stdin' option to set subcommand Derrick Stolee via GitGitGadget
2019-11-21 11:21           ` SZEDER Gábor
2019-11-21 13:15             ` Derrick Stolee
2019-10-21 13:56         ` [PATCH v5 06/17] sparse-checkout: create 'disable' subcommand Derrick Stolee via GitGitGadget
2019-11-19 16:15           ` SZEDER Gábor
2019-11-21 13:17             ` Derrick Stolee
2019-10-21 13:56         ` [PATCH v5 07/17] trace2: add region in clear_ce_flags Jeff Hostetler via GitGitGadget
2019-10-21 13:56         ` [PATCH v5 08/17] sparse-checkout: add 'cone' mode Derrick Stolee via GitGitGadget
2019-11-19 17:36           ` SZEDER Gábor
2019-10-21 13:56         ` [PATCH v5 09/17] sparse-checkout: use hashmaps for cone patterns Derrick Stolee via GitGitGadget
2019-10-21 13:56         ` [PATCH v5 10/17] sparse-checkout: init and set in cone mode Derrick Stolee via GitGitGadget
2019-11-19 17:50           ` SZEDER Gábor
2019-11-21 13:45             ` Derrick Stolee
2019-10-21 13:56         ` [PATCH v5 11/17] unpack-trees: hash less " Derrick Stolee via GitGitGadget
2019-10-21 13:56         ` [PATCH v5 12/17] unpack-trees: add progress to clear_ce_flags() Derrick Stolee via GitGitGadget
2019-10-21 13:56         ` [PATCH v5 13/17] read-tree: show progress by default Derrick Stolee via GitGitGadget
2019-10-21 15:04           ` Phillip Wood
2019-10-21 15:14             ` Derrick Stolee
2019-10-23  3:48               ` Junio C Hamano
2019-10-23 12:50                 ` Derrick Stolee
2019-10-24 10:18                   ` Phillip Wood
2019-10-24 10:18                 ` Phillip Wood
2019-10-21 13:56         ` [PATCH v5 14/17] sparse-checkout: sanitize for nested folders Derrick Stolee via GitGitGadget
2019-10-21 13:56         ` [PATCH v5 15/17] sparse-checkout: update working directory in-process Derrick Stolee via GitGitGadget
2019-11-19 17:07           ` SZEDER Gábor
2019-10-21 13:56         ` [PATCH v5 16/17] sparse-checkout: write using lockfile Derrick Stolee via GitGitGadget
2019-10-21 13:56         ` [PATCH v5 17/17] sparse-checkout: cone mode should not interact with .gitignore Derrick Stolee via GitGitGadget
2019-10-23  3:52         ` [PATCH v5 00/17] New sparse-checkout builtin and "cone" mode Junio C Hamano
2019-11-21 22:04         ` [PATCH v6 00/19] " Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 01/19] sparse-checkout: create builtin with 'list' subcommand Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 02/19] sparse-checkout: create 'init' subcommand Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 03/19] clone: add --sparse mode Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 04/19] sparse-checkout: 'set' subcommand Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 05/19] sparse-checkout: add '--stdin' option to set subcommand Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 06/19] sparse-checkout: create 'disable' subcommand Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 07/19] trace2: add region in clear_ce_flags Jeff Hostetler via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 08/19] sparse-checkout: add 'cone' mode Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 09/19] sparse-checkout: use hashmaps for cone patterns Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 10/19] sparse-checkout: init and set in cone mode Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 11/19] unpack-trees: hash less " Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 12/19] unpack-trees: add progress to clear_ce_flags() Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 13/19] sparse-checkout: sanitize for nested folders Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 14/19] sparse-checkout: update working directory in-process Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 15/19] sparse-checkout: use in-process update for disable subcommand Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 16/19] sparse-checkout: write using lockfile Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 17/19] sparse-checkout: cone mode should not interact with .gitignore Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 18/19] sparse-checkout: update working directory in-process for 'init' Derrick Stolee via GitGitGadget
2019-11-21 22:04           ` [PATCH v6 19/19] sparse-checkout: check for dirty status Derrick Stolee via GitGitGadget

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