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From: Elijah Newren <newren@gmail.com>
To: 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: Sat, 5 Oct 2019 21:22:32 -0700
Message-ID: <CABPp-BE9HrMyskiMhQ7VxeMvZX_CCurUM_20M6md2UXZG13XEA@mail.gmail.com> (raw)
In-Reply-To: <84511255d1f28e1bdcec3de6096d2d9ac2a9f483.1568904188.git.gitgitgadget@gmail.com>

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.

>  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?

  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 [this message]
2019-10-07 19:15       ` 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 12/17] unpack-trees: add progress to clear_ce_flags() 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 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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