Re: [PATCH v2 1/2] sparse-checkout: list folders in cone mode

>
> From: Derrick Stolee <dstolee@microsoft.com>
>
> When core.sparseCheckoutCone is enabled, the 'git sparse-checkout set'
> command takes a list of folders as input, then creates an ordered

>
> With this change, the following piped commands would not change the
> working directory:
>
>         git sparse-checkout list | git sparse-checkout set --stdin
>
> The only time this would not work is if core.sparseCheckoutCone is
> true, but the sparse-checkout file contains patterns that do not
> match the expected pattern types for cone mode.
>
> Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
> ---
>  Documentation/git-sparse-checkout.txt | 11 ++++++++++-
>  builtin/sparse-checkout.c             | 21 +++++++++++++++++++++
>  t/t1091-sparse-checkout-builtin.sh    | 11 +++++++++++
>  3 files changed, 42 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/git-sparse-checkout.txt b/Documentation/git-sparse-checkout.txt
> index 9c3c66cc37..dcca9ee826 100644
> --- a/Documentation/git-sparse-checkout.txt
> +++ b/Documentation/git-sparse-checkout.txt
> @@ -28,7 +28,7 @@ THE FUTURE.
>  COMMANDS
>  --------
>  'list'::
> -       Provide a list of the contents in the sparse-checkout file.
> +       Describe the patterns in the sparse-checkout file.
>
>  'init'::
>         Enable the `core.sparseCheckout` setting. If the
> @@ -150,6 +150,15 @@ 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.
>
> +In the cone mode case, the `git sparse-checkout list` subcommand will list the
> +folders that define the recursive patterns. For the example sparse-checkout file

> +above, the output is as follows:
> +
> +--------------------------
> +$ git sparse-checkout list
> +A/B/C
> +--------------------------
> +
>  If `core.ignoreCase=true`, then the pattern-matching algorithm will use a
>  case-insensitive check. This corrects for case mismatched filenames in the
>  'git sparse-checkout set' command to reflect the expected cone in the working
> diff --git a/builtin/sparse-checkout.c b/builtin/sparse-checkout.c
> index 5d62f7a66d..b3bed891cb 100644
> --- a/builtin/sparse-checkout.c
> +++ b/builtin/sparse-checkout.c
> @@ -53,6 +53,8 @@ static int sparse_checkout_list(int argc, const char **argv)
>
>         memset(&pl, 0, sizeof(pl));
>
> +       pl.use_cone_patterns = core_sparse_checkout_cone;
> +
>         sparse_filename = get_sparse_checkout_filename();
>         res = add_patterns_from_file_to_list(sparse_filename, "", 0, &pl, NULL);
>         free(sparse_filename);
> @@ -62,6 +64,25 @@ static int sparse_checkout_list(int argc, const char **argv)
>                 return 0;
>         }
>
> +       if (pl.use_cone_patterns) {
> +               int i;
> +               struct pattern_entry *pe;
> +               struct hashmap_iter iter;
> +               struct string_list sl = STRING_LIST_INIT_DUP;
> +
> +               hashmap_for_each_entry(&pl.recursive_hashmap, &iter, pe, ent) {
> +                       /* pe->pattern starts with "/", skip it */
> +                       string_list_insert(&sl, pe->pattern + 1);
> +               }
> +
> +               string_list_sort(&sl);
> +
> +               for (i = 0; i < sl.nr; i++)
> +                       printf("%s\n", sl.items[i].string);
> +
> +               return 0;
> +       }
> +
>         write_patterns_to_file(stdout, &pl);
>         clear_pattern_list(&pl);
>
> diff --git a/t/t1091-sparse-checkout-builtin.sh b/t/t1091-sparse-checkout-builtin.sh
> index 6f7e2d0c9e..37f6d8fa90 100755
> --- a/t/t1091-sparse-checkout-builtin.sh
> +++ b/t/t1091-sparse-checkout-builtin.sh
> @@ -246,6 +246,17 @@ test_expect_success 'cone mode: init and set' '
>         test_cmp expect dir
>  '
>
> +test_expect_success 'cone mode: list' '
> +       cat >expect <<-EOF &&
> +               folder1
> +               folder2
> +       EOF
> +       git -C repo sparse-checkout set --stdin <expect &&
> +       git -C repo sparse-checkout list >actual 2>err &&
> +       test_must_be_empty err &&
> +       test_cmp expect actual
> +'
> +
>  test_expect_success 'cone mode: set with nested folders' '