Re: [PATCH v2 2/2] clean: avoid traversing into untracked dirs when unnecessary

>
> When deleting all untracked and ignored files and any nested
> repositories (such as with `git clean -ffdx`), we do not need to recurse
> into an untracked directory to see if any of the entries under it are
> ignored or a nested repository.  Special case this condition to avoid
> unnecessary recursion.
> ---
>  builtin/clean.c  |  4 +++-
>  t/t7300-clean.sh | 24 ++++++++++++++++++++++++
>  2 files changed, 27 insertions(+), 1 deletion(-)
>
> diff --git a/builtin/clean.c b/builtin/clean.c
> index 18b37e3fd9..1b1454d052 100644
> --- a/builtin/clean.c
> +++ b/builtin/clean.c
> @@ -978,7 +978,9 @@ int cmd_clean(int argc, const char **argv, const char *prefix)
>                 remove_directories = 1;
>         }
>
> -       if (remove_directories && !ignored_only) {
> +       if (remove_directories && ignored && !exclude_list.nr && force > 1)
> +               ; /* No need to recurse to look for ignored files */
> +       else if (remove_directories && !ignored_only) {
>                 /*
>                  * We need to know about ignored files too:
>                  *
> diff --git a/t/t7300-clean.sh b/t/t7300-clean.sh
> index 0399701e62..ceab7c4883 100755
> --- a/t/t7300-clean.sh
> +++ b/t/t7300-clean.sh
> @@ -788,4 +788,28 @@ test_expect_success 'traverse into directories that may have ignored entries' '
>         )
>  '
>
> +test_expect_success 'avoid traversing into untracked directories' '
> +       test_when_finished rm -f output error trace.* &&
> +       git init avoid-traversing-untracked-hierarchy &&
> +       (
> +               cd avoid-traversing-untracked-hierarchy &&
> +
> +               mkdir -p untracked/subdir/with/b &&
> +               mkdir -p untracked/subdir/with/a &&
> +               >untracked/subdir/with/a/random-file.txt &&
> +
> +               GIT_TRACE2_PERF="$TRASH_DIRECTORY/trace.output" \
> +               git clean -ffdx
> +       ) &&
> +
> +       # Make sure we only visited into the top-level directory, and did
> +       # not traverse into the "untracked" subdirectory since it was excluded
> +       grep data.*read_directo.*directories-visited trace.output |
> +               cut -d "|" -f 9 >trace.relevant &&
> +       cat >trace.expect <<-EOF &&
> +        ..directories-visited:1
> +       EOF
> +       test_cmp trace.expect trace.relevant
> +'
> +
>  test_done
> --
> 2.35.1