Re: [PATCH v2 2/4] diff --no-index: die on error reading stdin

> From: Phillip Wood <phillip.wood@dunelm.org.uk>
>
> If there is an error when reading from stdin then "diff --no-index"
> prints an error message but continues to try and diff a file named "-"
> resulting in an error message that looks like
>
>     error: error while reading from stdin: Invalid argument
>     fatal: stat '-': No such file or directory
>
> assuming that no file named "-" exists. If such a file exists it prints
> the first error message and generates the diff from that file which is
> not what the user wanted. Instead just die() straight away if we cannot
> read from stdin.

> Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
> ---
>  diff-no-index.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/diff-no-index.c b/diff-no-index.c
> index 77462ac2a9..4470e0271d 100644
> --- a/diff-no-index.c
> +++ b/diff-no-index.c
> @@ -60,20 +60,19 @@ static int get_mode(const char *path, int *mode)
>  	return 0;
>  }
>  
> -static int populate_from_stdin(struct diff_filespec *s)
> +static void populate_from_stdin(struct diff_filespec *s)
>  {
>  	struct strbuf buf = STRBUF_INIT;
>  	size_t size = 0;
>  
>  	if (strbuf_read(&buf, 0, 0) < 0)
> -		return error_errno("error while reading from stdin");
> +		die_errno("error while reading from stdin");
>  
>  	s->should_munmap = 0;
>  	s->data = strbuf_detach(&buf, &size);
>  	s->size = size;
>  	s->should_free = 1;
>  	s->is_stdin = 1;
> -	return 0;
>  }
>  
>  static struct diff_filespec *noindex_filespec(const char *name, int mode)