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From:   Daniel Latypov <dlatypov@google.com>
Date:   Wed, 16 Jun 2021 14:14:40 -0700
Message-ID: <CAGS_qxo4L+Z=Z4ZRQ+z6BP2A6v2two5WyjMmLfTE0a=e0y1OAg@mail.gmail.com>
Subject: Re: [PATCH] kunit: tool: Assert version requirement
To:     SeongJae Park <sj38.park@gmail.com>
Cc:     Brendan Higgins <brendanhiggins@google.com>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@vger.kernel.org>,
        KUnit Development <kunit-dev@googlegroups.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        SeongJae Park <sjpark@amazon.de>
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On Wed, Jun 16, 2021 at 2:40 AM SeongJae Park <sj38.park@gmail.com> wrote:
>
> From: SeongJae Park <sjpark@amazon.de>
>
> Commit 87c9c1631788 ("kunit: tool: add support for QEMU") on the 'next'
> tree adds 'from __future__ import annotations' in 'kunit_kernel.py'.
> Because it is supported on only >=3.7 Python, people using older Python
> will get below error:

Ah, we had been fine with just using 3.6 before this (and could have
dropped down to 3.5 with a few lines changed).

But 3.7 came out initially in 2018*, so I assume we're probably fine
to rely on that in kunit tool.
*https://www.python.org/downloads/release/python-370/

>
>     Traceback (most recent call last):
>       File "./tools/testing/kunit/kunit.py", line 20, in <module>
>         import kunit_kernel
>       File "/home/sjpark/linux/tools/testing/kunit/kunit_kernel.py", line 9
>         from __future__ import annotations
>         ^
>     SyntaxError: future feature annotations is not defined
>
> This commit adds a version assertion in 'kunit.py', so that people get
> more explicit error message like below:
>
>    Traceback (most recent call last):
>       File "./tools/testing/kunit/kunit.py", line 15, in <module>
>         assert sys.version_info >= (3, 7)
>     AssertionError
>
> Signed-off-by: SeongJae Park <sjpark@amazon.de>

Acked-by: Daniel Latypov <dlatypov@google.com>

> ---
>  tools/testing/kunit/kunit.py | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/tools/testing/kunit/kunit.py b/tools/testing/kunit/kunit.py
> index be8d8d4a4e08..748d88178506 100755
> --- a/tools/testing/kunit/kunit.py
> +++ b/tools/testing/kunit/kunit.py
> @@ -12,6 +12,8 @@ import sys
>  import os
>  import time
>
> +assert sys.version_info >= (3, 7)

Do we perhaps want
  assert sys.version_info >= (3, 7), "Python version is too old"

Then the error message would be
  Traceback (most recent call last):
    File "./tools/testing/kunit/kunit.py", line 15, in <module>
      assert sys.version_info >= (3, 7), "Python version is too old"
  AssertionError: Python version is too old

I assume kernel devs know some Python, but not necessarily that
sys.version_info == "my python version"

> +
>  from collections import namedtuple
>  from enum import Enum, auto
>
> --
> 2.17.1
>
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