linux-kernel - Re: [RFC] KTAP spec v2: prefix to KTAP data

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Date:   Thu, 12 May 2022 08:25:04 -0700
From:   Daniel Latypov <dlatypov@...gle.com>
To:     Frank Rowand <frowand.list@...il.com>
Cc:     David Gow <davidgow@...gle.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>, Tim.Bird@...y.com,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Jonathan Corbet <corbet@....net>, rmr167@...il.com,
        guillaume.tucker@...labora.com, kernelci@...ups.io,
        kunit-dev@...glegroups.com, linux-kselftest@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] KTAP spec v2: prefix to KTAP data

On Wed, May 11, 2022 at 11:01 PM Frank Rowand <frowand.list@...il.com> wrote:
> ================================================================================
> #### discussion notes:
>
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> PRO: minimally invasive to specification.
>
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> CON:
>
> KTAP does not include any mechanism to describe the value of <prefix string>
> to test harnesses and test output processing programs.  The test output
> processing programs must infer the value of <prefix string> by detecting
> the <prefix string> in the "Version lines".
>
> The detection of a "Version lines" might be a match of the regex:
>
>    "^.*KTAP version 2$"
>
> This risks falsely detecting a "Version lines", but the risk is small???

Agree this is a risk and also think it's probably small, but it's hard to say.
I think the $ anchoring the regex is probably safe enough.

As noted earlier, this tracks with what kunit.py already does.
That was necessitated by dynamic prefixes such as timestamps, etc.
So I think this is probably a fine risk to take.

I imagine we could add constraints of prefix string, e.g. must have []
around it, etc. if we want to try and minimize this risk.
But I don't know if it's necessarily worth it, given what we know right now.

Along those lines, I think I like this approach (Alternative 1) more
than Alternative 2/2b.
I'm not sure we need a structured way to specify metadata in KTAP yet?
The prefix seems like a reasonable candidate, but do others have ideas
of other bits of metadata we'd want to be able to declare?

Daniel