Subject: Re: [PATCH v4 3/4] diff: enable and test the sparse index

From: Junio C Hamano <[email-masked]>
Date: Tue, 23 Nov 2021 15:48:28 -0800

"Lessley Dennington via GitGitGadget" <[email-masked]>
writes:

> diff --git a/builtin/diff.c b/builtin/diff.c
> index dd8ce688ba7..fa4683377eb 100644
> --- a/builtin/diff.c
> +++ b/builtin/diff.c
> @@ -437,6 +437,11 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
>  
>  	prefix = setup_git_directory_gently(&nongit);
>  
> +	if (!nongit) {
> +		prepare_repo_settings(the_repository);
> +		the_repository->settings.command_requires_full_index = 0;
> +	}
> +

It is very pleasing to see that with all the preparations, it is
jsut a very simple matter of adding four lines to enable the big
feature.

At this point immediately after asking setup_git_directory_gently(),
we positively know if we are in a repository, so the placement of
the new code makes perfect sense.

Nice.