From: Junio C Hamano <gitster@pobox.com>
Date: Thu, 08 Feb 2018 18:20:47 GMT
Subject: Re: [PATCH v1] name-hash: properly fold directory names in adjust_dirname_case()
Message-ID: <xmqqlgg35on4.fsf@gitster-ct.c.googlers.com>
In-Reply-To: <20180208004156.36224-1-benpeart@microsoft.com>

Ben Peart <benpeart@microsoft.com> writes:

> Correct the pointer arithmetic in adjust_dirname_case() so that it calls
> find_dir_entry() with the correct string length.  Previously passing in
> "dir1/foo" would pass a length of 6 instead of the correct 4.  This resulted in
> find_dir_entry() never finding the entry and so the subsequent memcpy that would
> fold the name to the version with the correct case never executed.
>
> Add a test to validate the corrected behavior with name folding of directories.
>
> Signed-off-by: Ben Peart <benpeart@microsoft.com>
> ---

Thanks.

It appears that this codepath has been miscounting ever since it was
introduced in 41284eb0 ("name-hash: don't reuse cache_entry in
dir_entry", 2015-10-21).

> diff --git a/t/t0050-filesystem.sh b/t/t0050-filesystem.sh
> index b29d749bb7..219c96594c 100755
> --- a/t/t0050-filesystem.sh
> +++ b/t/t0050-filesystem.sh
> @@ -80,7 +80,17 @@ test_expect_success 'merge (case change)' '
> ...
> +test_expect_success CASE_INSENSITIVE_FS 'add directory (with different case)' '
> +	git reset --hard initial &&
> +	mkdir -p dir1 &&
> +	mkdir -p dir1/dir2 &&

A single "mkdir -p dir1/dir2" should be sufficient, thanks to "-p" ;-)

> +	touch dir1/dir2/a &&
> +	touch dir1/dir2/b &&

Hmph.