From: Junio C Hamano <gitster@pobox.com>
Date: Mon, 16 Jun 2014 22:05:47 GMT
Subject: Re: [PATCH 01/14] test-lib: add test_dir_is_empty()
Message-ID: <xmqq7g4gpl1g.fsf@gitster.dls.corp.google.com>
In-Reply-To: <539DD068.6020301@web.de>

Jens Lehmann <Jens.Lehmann@web.de> writes:

> For the upcoming submodule test framework we often need to assert that an
> empty directory exists in the work tree. Add the test_dir_is_empty()
> function which asserts that the given argument is an empty directory.
>
> Signed-off-by: Jens Lehmann <Jens.Lehmann@web.de>
> ---
>  t/test-lib-functions.sh | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
> index 158e10a..546f0a6 100644
> --- a/t/test-lib-functions.sh
> +++ b/t/test-lib-functions.sh
> @@ -489,6 +489,17 @@ test_path_is_dir () {
>  	fi
>  }
>
> +# Check if the directory exists and is empty as expected, barf otherwise.
> +test_dir_is_empty () {
> +	test_path_is_dir "$1" &&
> +	if test "$(ls -a1 "$1" | egrep -v '^\.\.?$')"

It is safer to say "test -n" when testing an emptyness of a string
whose contents you do not know or control (e.g. the string may begin
with "-something").

> +	then
> +		echo "Directory '$1' is not empty, it contains:"
> +		ls -la "$1"
> +		return 1
> +	fi
> +}
> +
>  test_path_is_missing () {
>  	if [ -e "$1" ]
>  	then