Re: [PATCH] http-backend: allow empty CONTENT_LENGTH

[Junio C Hamano <gitster@pobox.com>]

Max Kirillov <max@max630.net> writes:

> According to RFC3875, empty environment variable is equivalent to unset,
> and for CONTENT_LENGTH it should mean zero body to read.
>
> However, as discussed in [1], unset CONTENT_LENGTH is also used for
> chunked encoding to indicate reading until EOF, so keep this behavior also
> for empty CONTENT_LENGTH.

Makes sense.

>
> Add a test for the case.
>
> [1] https://public-inbox.org/git/20160329201349.GB9527@sigill.intra.peff.net/
>
> Signed-off-by: Max Kirillov <max@max630.net>
> ---
> Hi.
>
> This should fix it. I'm not sure should it treat it as 0 or "-1"
> At least the tests mentioned by Jeff fails if I try to treat missing CONTENT_LENGTH as "-1"
> So keep the existing behavior as much as possible

I am not sure what you mean by the above, between 0 and -1.  The
code signals the caller of get_content_length() that req_len is -1
which is used as a sign to read through to the EOF, so it appears to
me that the code treats missing content-length (i.e. str == NULL
case) as "-1".


>  http-backend.c                         |  2 +-
>  t/t5562-http-backend-content-length.sh | 11 +++++++++++
>  2 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/http-backend.c b/http-backend.c
> index e88d29f62b..a1230d7ead 100644
> --- a/http-backend.c
> +++ b/http-backend.c
> @@ -353,7 +353,7 @@ static ssize_t get_content_length(void)
>  	ssize_t val = -1;
>  	const char *str = getenv("CONTENT_LENGTH");
>  
> -	if (str && !git_parse_ssize_t(str, &val))
> +	if (str && *str && !git_parse_ssize_t(str, &val))
>  		die("failed to parse CONTENT_LENGTH: %s", str);
>  	return val;
>  }
> diff --git a/t/t5562-http-backend-content-length.sh b/t/t5562-http-backend-content-length.sh
> index 057dcb85d6..ca34c2f054 100755
> --- a/t/t5562-http-backend-content-length.sh
> +++ b/t/t5562-http-backend-content-length.sh
> @@ -152,4 +152,15 @@ test_expect_success 'CONTENT_LENGTH overflow ssite_t' '
>  	grep "fatal:.*CONTENT_LENGTH" err
>  '
>  
> +test_expect_success 'empty CONTENT_LENGTH' '
> +	env \
> +		QUERY_STRING=/repo.git/HEAD \
> +		PATH_TRANSLATED="$PWD"/.git/HEAD \
> +		GIT_HTTP_EXPORT_ALL=TRUE \
> +		REQUEST_METHOD=GET \
> +		CONTENT_LENGTH="" \
> +		git http-backend <empty_body >act.out 2>act.err &&
> +	verify_http_result "200 OK"
> +'
> +
>  test_done