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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>,
	Derrick Stolee <dstolee@microsoft.com>
Subject: Re: [PATCH v2 08/11] sparse-checkout: add 'cone' mode
Date: Mon, 7 Oct 2019 15:15:27 -0400
Message-ID: <991a2cee-fa1e-547c-c885-a4aaf663d9b6@gmail.com> (raw)
In-Reply-To: <CABPp-BE9HrMyskiMhQ7VxeMvZX_CCurUM_20M6md2UXZG13XEA@mail.gmail.com>

On 10/6/2019 12:22 AM, Elijah Newren wrote:
> On Thu, Sep 19, 2019 at 1:45 PM Derrick Stolee via GitGitGadget
> <gitgitgadget@gmail.com> wrote:
>>
>> From: Derrick Stolee <dstolee@microsoft.com>
>>
>> The sparse-checkout feature can have quadratic performance as
>> the number of patterns and number of entries in the index grow.
>> If there are 1,000 patterns and 1,000,000 entries, this time can
>> be very significant.
>>
>> Create a new Boolean config option, core.sparseCheckoutCone, to
>> indicate that we expect the sparse-checkout file to contain a
>> more limited set of patterns. This is a separate config setting
>> from core.sparseCheckout to avoid breaking older clients by
>> introcuding a tri-state option.
> 
> s/introcuding/introducing/
> 
>> The config option does nothing right now, but will be expanded
>> upon in a later commit.
>>
>> Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
>> ---
>>  Documentation/config/core.txt         |  7 ++--
>>  Documentation/git-sparse-checkout.txt | 50 +++++++++++++++++++++++++++
>>  cache.h                               |  4 ++-
>>  config.c                              |  5 +++
>>  environment.c                         |  1 +
>>  t/t1091-sparse-checkout-builtin.sh    | 14 ++++++++
>>  6 files changed, 78 insertions(+), 3 deletions(-)
>>
>> diff --git a/Documentation/config/core.txt b/Documentation/config/core.txt
>> index 75538d27e7..9b8ab2a6d4 100644
>> --- a/Documentation/config/core.txt
>> +++ b/Documentation/config/core.txt
>> @@ -591,8 +591,11 @@ core.multiPackIndex::
>>         multi-pack-index design document].
>>
>>  core.sparseCheckout::
>> -       Enable "sparse checkout" feature. See section "Sparse checkout" in
>> -       linkgit:git-read-tree[1] for more information.
>> +       Enable "sparse checkout" feature. If "false", then sparse-checkout
>> +       is disabled. If "true", then sparse-checkout is enabled with the full
>> +       .gitignore pattern set. If "cone", then sparse-checkout is enabled with
>> +       a restricted pattern set. See linkgit:git-sparse-checkout[1] for more
>> +       information.
> 
> This isn't consistent with the commit message that suggests it's a new
> option rather than a new possible value for an old option.

Thanks for the catch. I forgot to update the docs. Fixed for v3.

>>  core.abbrev::
>>         Set the length object names are abbreviated to.  If
>> diff --git a/Documentation/git-sparse-checkout.txt b/Documentation/git-sparse-checkout.txt
>> index da95b28b1c..757326618d 100644
>> --- a/Documentation/git-sparse-checkout.txt
>> +++ b/Documentation/git-sparse-checkout.txt
>> @@ -87,6 +87,56 @@ using negative patterns. For example, to remove the file `unwanted`:
>>  ----------------
>>
>>
>> +## CONE PATTERN SET
>> +
>> +The full pattern set allows for arbitrary pattern matches and complicated
>> +inclusion/exclusion rules. These can result in O(N*M) pattern matches when
>> +updating the index, where N is the number of patterns and M is the number
>> +of paths in the index. To combat this performance issue, a more restricted
>> +pattern set is allowed when `core.spareCheckoutCone` is enabled.
>> +
>> +The accepted patterns in the cone pattern set are:
>> +
>> +1. *Recursive:* All paths inside a directory are included.
>> +
>> +2. *Parent:* All files immediately inside a directory are included.
>> +
>> +In addition to the above two patterns, we also expect that all files in the
>> +root directory are included. If a recursive pattern is added, then all
>> +leading directories are added as parent patterns.
>> +
>> +By default, when running `git sparse-checkout init`, the root directory is
>> +added as a parent pattern. At this point, the sparse-checkout file contains
>> +the following patterns:
>> +
>> +```
>> +/*
>> +!/*/
>> +```
>> +
>> +This says "include everything in root, but nothing two levels below root."
>> +If we then add the folder `A/B/C` as a recursive pattern, the folders `A` and
>> +`A/B` are added as parent patterns. The resulting sparse-checkout file is
>> +now
>> +
>> +```
>> +/*
>> +!/*/
>> +/A/
>> +!/A/*/
>> +/A/B/
>> +!/A/B/*/
>> +/A/B/C/
>> +```
>> +
>> +Here, order matters, so the negative patterns are overridden by the positive
>> +patterns that appear lower in the file.
>> +
>> +If `core.sparseCheckoutCone=true`, then Git will parse the sparse-checkout file
>> +expecting patterns of these types. Git will warn if the patterns do not match.
>> +If the patterns do match the expected format, then Git will use faster hash-
>> +based algorithms to compute inclusion in the sparse-checkout.
>> +
>>  SEE ALSO
>>  --------
>>
>> diff --git a/cache.h b/cache.h
>> index cf5d70c196..8e8ea67efa 100644
>> --- a/cache.h
>> +++ b/cache.h
>> @@ -911,12 +911,14 @@ extern char *git_replace_ref_base;
>>
>>  extern int fsync_object_files;
>>  extern int core_preload_index;
>> -extern int core_apply_sparse_checkout;
>>  extern int precomposed_unicode;
>>  extern int protect_hfs;
>>  extern int protect_ntfs;
>>  extern const char *core_fsmonitor;
>>
>> +int core_apply_sparse_checkout;
>> +int core_sparse_checkout_cone;
>> +
>>  /*
>>   * Include broken refs in all ref iterations, which will
>>   * generally choke dangerous operations rather than letting
>> diff --git a/config.c b/config.c
>> index 296a6d9cc4..f65c74f5b7 100644
>> --- a/config.c
>> +++ b/config.c
>> @@ -1329,6 +1329,11 @@ static int git_default_core_config(const char *var, const char *value, void *cb)
>>                 return 0;
>>         }
>>
>> +       if (!strcmp(var, "core.sparsecheckoutcone")) {
>> +               core_sparse_checkout_cone = git_config_bool(var, value);
>> +               return 0;
>> +       }
>> +
>>         if (!strcmp(var, "core.precomposeunicode")) {
>>                 precomposed_unicode = git_config_bool(var, value);
>>                 return 0;
>> diff --git a/environment.c b/environment.c
>> index 89af47cb85..670d92bcc0 100644
>> --- a/environment.c
>> +++ b/environment.c
>> @@ -69,6 +69,7 @@ enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
>>  char *notes_ref_name;
>>  int grafts_replace_parents = 1;
>>  int core_apply_sparse_checkout;
>> +int core_sparse_checkout_cone;
>>  int merge_log_config = -1;
>>  int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
>>  unsigned long pack_size_limit_cfg;
>> diff --git a/t/t1091-sparse-checkout-builtin.sh b/t/t1091-sparse-checkout-builtin.sh
>> index 22fa032d6d..9b089c98c4 100755
>> --- a/t/t1091-sparse-checkout-builtin.sh
>> +++ b/t/t1091-sparse-checkout-builtin.sh
>> @@ -140,6 +140,20 @@ test_expect_success 'set sparse-checkout using --stdin' '
>>         test_cmp expect dir
>>  '
>>
>> +test_expect_success 'cone mode: match patterns' '
>> +       git -C repo config --worktree core.sparseCheckoutCone true &&
>> +       rm -rf repo/a repo/folder1 repo/folder2 &&
>> +       git -C repo read-tree -mu HEAD &&
>> +       git -C repo reset --hard &&
>> +       ls repo >dir  &&
>> +       cat >expect <<-EOF &&
>> +               a
>> +               folder1
>> +               folder2
>> +       EOF
>> +       test_cmp expect dir
>> +'
>> +
>>  test_expect_success 'sparse-checkout disable' '
>>         git -C repo sparse-checkout disable &&
>>         test_path_is_missing repo/.git/info/sparse-checkout &&
>> --
>> gitgitgadget
> 
> What if core.sparseCheckoutCone is true but core.sparseCheckout is
> false?  Is that an error case we warn the user about, or do we make
> sense of it somehow?

`core.sparseCheckoutCone` means "when you are doing sparse-checkout things,
try to use the fast logic assuming you have the cone patterns." It does not
enable the sparse-checkout on its own. It only changes run-time performance.

This is important for compatibility with other clients that will only look
at `core.sparseCheckout`.

Thanks,
-Stolee


  reply index

Thread overview: 154+ 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 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 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 [this message]
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
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
2019-10-21 13:56         ` [PATCH v5 02/17] sparse-checkout: create 'init' subcommand Derrick Stolee via GitGitGadget
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
2019-10-21 13:56         ` [PATCH v5 05/17] sparse-checkout: add '--stdin' option to set subcommand Derrick Stolee via GitGitGadget
2019-10-21 13:56         ` [PATCH v5 06/17] sparse-checkout: create 'disable' subcommand Derrick Stolee via GitGitGadget
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
2019-10-21 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
2019-10-21 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
2019-10-21 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

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	nntp://czquwvybam4bgbro.onion/inbox.comp.version-control.git
	nntp://hjrcffqmbrq6wope.onion/inbox.comp.version-control.git
	nntp://news.gmane.org/gmane.comp.version-control.git

 note: .onion URLs require Tor: https://www.torproject.org/

AGPL code for this site: git clone https://public-inbox.org/public-inbox.git