Re: [PATCH] http: fix v1 protocol tests with apache httpd < 2.4

[Jeff King <peff@peff.net>]

On Tue, Jan 02, 2018 at 07:39:46PM -0500, Todd Zullinger wrote:

> Brandon Williams wrote:
> > Seems good to me.  I think I was just being overly cautious when i was
> > implementing those patches.  Thanks!
> 
> Cool, thanks for taking a look.
> 
> In this case, the test isn't dependent on apache > 2.4, but
> before I checked that I wondered if we had any way to run a
> test only if the apache version was greater or lesser than
> some release.  Luckily, I didn't have to work out such a
> method. :)
> 
> I don't know if there's a clean way to do that
> automatically, short of parsing the output of 'httpd -v'
> should we ever need to add such a prereq.

In the general case, we could probably define an endpoint within an <If>
block, and then try to access the endpoint from the test script.

E.g., something like:

    <IfVersion >= 2.4>
    Alias /have-2.4.txt www/yes.txt
    </IfVersion>

in the apache config, and then:

  test_lazy_prereq APACHE24 '
        echo yes >"$HTTPD_DOCUMENT_ROOT_PATH/yes.txt" &&
        curl -f "$HTTPD_URL/have-2.4.txt"
  '

in the test script (of course we may not want to depend on having
command-line curl, but we could replace that with "git ls-remote" or
similar).

One nice thing about that approach is that it can be extended to other
"If" blocks, like if we have a particular module available, or if ssl is
configured.

-Peff