Re: [PATCH] add: die if both --dry-run and --interactive are given

[ZheNing Hu <adlternative@gmail.com>]

Hi, Øystein Walle,

Øystein Walle <oystwa@gmail.com> 于2021年5月5日周三 下午10:53写道：
>
> The interactive machinery does not obey --dry-run. Die appropriate if
> both flags are passed.
>
> Signed-off-by: Øystein Walle <oystwa@gmail.com>
> ---
> I think a better solution would be to allow this and improve the
> interactive machinery to handle --dry-run. This is what I could muster
> up at the moment.
>
>  builtin/add.c  | 2 ++
>  t/t3700-add.sh | 4 ++++
>  2 files changed, 6 insertions(+)
>
> diff --git a/builtin/add.c b/builtin/add.c
> index ea762a41e3..6077eb189f 100644
> --- a/builtin/add.c
> +++ b/builtin/add.c
> @@ -457,6 +457,8 @@ int cmd_add(int argc, const char **argv, const char *prefix)
>         if (patch_interactive)
>                 add_interactive = 1;
>         if (add_interactive) {
> +               if (show_only)
> +                       die(_("--dry-run is incompatible with --interactive/--patch"));
>                 if (pathspec_from_file)
>                         die(_("--pathspec-from-file is incompatible with --interactive/--patch"));
>                 exit(interactive_add(argv + 1, prefix, patch_interactive));
> diff --git a/t/t3700-add.sh b/t/t3700-add.sh
> index b3b122ff97..171b323f50 100755
> --- a/t/t3700-add.sh
> +++ b/t/t3700-add.sh
> @@ -343,6 +343,10 @@ test_expect_success 'git add --dry-run --ignore-missing of non-existing file out
>         test_cmp expect.err actual.err
>  '
>
> +test_expect_success 'git add --dry-run --interactive should fail' '
> +       test_must_fail git add --dry-run --interactive
> +'
> +
>  test_expect_success 'git add empty string should fail' '
>         test_must_fail git add ""
>  '
> --
> 2.27.0
>

Thank you for solving this confusion of mine. For the time being,
it is an easier solution to make the two flags mutually exclusive.
But if we need to make `git add -i` support `--dry-run` in the future,
maybe we should passed the parameter `DRY_RUN` (maybe an
environment  variable) to the sub-process `git -add--interactive.perl`
and finally this feature may be implemented in `git apply`.

Reported-by: ZheNing Hu <adlternative@gmail.com>

Thanks!
--
ZheNing Hu