Subject: Re: [GSoC PATCH] apply: report input location in binary and garbage patch errors

From: Junio C Hamano <[email-masked]>
Date: Tue, 17 Mar 2026 09:08:08 -0700

Jialong Wang <[email-masked]> writes:

> diff --git a/t/t4100-apply-stat.sh b/t/t4100-apply-stat.sh
> index b3d93d8ed6..8393076469 100755
> --- a/t/t4100-apply-stat.sh
> +++ b/t/t4100-apply-stat.sh
> @@ -125,4 +125,16 @@ test_expect_success 'applying a patch with an invalid mode reports the input' '
>  	EOF
>  	test_cmp expect err
>  '
> +
> +test_expect_success 'applying a patch with only garbage reports the input' '
> +	cat >garbage.patch <<-\EOF &&
> +	diff --git a/f b/f
> +	--- a/f
> +	+++ b/f
> +	this is garbage
> +	EOF
> +	test_must_fail git apply garbage.patch 2>err &&
> +	echo "error: patch with only garbage at garbage.patch:4" >expect &&
> +	test_cmp expect err
> +'
>  test_done

What is this patch based on?  Can we have a consolidated either a
single patch or a series of patches that form a single topic?

> diff --git a/t/t4103-apply-binary.sh b/t/t4103-apply-binary.sh
> index 8e302a5a57..f2d41e06bc 100755
> --- a/t/t4103-apply-binary.sh
> +++ b/t/t4103-apply-binary.sh
> @@ -179,6 +179,24 @@ test_expect_success PERL_TEST_HELPERS 'reject truncated binary diff' '
>  	" <patch >patch.trunc &&
>  
>  	do_reset &&
> -	test_must_fail git apply patch.trunc
> +	test_must_fail git apply patch.trunc 2>err &&
> +	line=$(awk "END { print NR + 1 }" patch.trunc) &&
> +	grep "error: corrupt binary patch at patch.trunc:$line: " err
> +'
> +
> +test_expect_success 'reject unrecognized binary diff' '
> +	cat >patch.bad <<-\EOF &&
> +	diff --git a/f b/f
> +	new file mode 100644
> +	index 0000000..7898192
> +	GIT binary patch
> +	bogus
> +	EOF
> +	test_must_fail git apply patch.bad 2>err &&
> +	cat >expect <<-\EOF &&
> +	error: unrecognized binary patch at patch.bad:4
> +	error: No valid patches in input (allow with "--allow-empty")
> +	EOF
> +	test_cmp expect err
>  '
>  test_done