linux-kernel - Re: [PATCH bpf-next v3 5/5] selftests/bpf: Add test for "bpftool feature" command

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Date:   Wed, 26 Feb 2020 15:43:25 +0000
From:   Quentin Monnet <quentin@...valent.com>
To:     Daniel Borkmann <daniel@...earbox.net>,
        Michal Rostecki <mrostecki@...nsuse.org>, bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 5/5] selftests/bpf: Add test for "bpftool
 feature" command

2020-02-26 16:34 UTC+0100 ~ Daniel Borkmann <daniel@...earbox.net>
> On 2/25/20 8:44 PM, Michal Rostecki wrote:
>> Add Python module with tests for "bpftool feature" command, which mainly
>> wheck whether the "full" option is working properly.
> 
> nit, typo: wheck
> 
>>
>> Signed-off-by: Michal Rostecki <mrostecki@...nsuse.org>
> 
> Ptal, when running the test I'm getting the following error:
> 
> root@...k:~/bpf-next/tools/testing/selftests/bpf# ./test_bpftool.sh
> test_feature_dev_json (test_bpftool.TestBpftool) ... ERROR
> test_feature_kernel (test_bpftool.TestBpftool) ... ERROR
> test_feature_kernel_full (test_bpftool.TestBpftool) ... ERROR
> test_feature_kernel_full_vs_not_full (test_bpftool.TestBpftool) ... ERROR
> test_feature_macros (test_bpftool.TestBpftool) ... ERROR
> 
> ======================================================================
> ERROR: test_feature_dev_json (test_bpftool.TestBpftool)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>    File "/root/bpf-next/tools/testing/selftests/bpf/test_bpftool.py", 
> line 58, in wrapper
>      return f(*args, iface, **kwargs)
>    File "/root/bpf-next/tools/testing/selftests/bpf/test_bpftool.py", 
> line 83, in test_feature_dev_json
>      res = bpftool_json(["feature", "probe", "dev", iface])
>    File "/root/bpf-next/tools/testing/selftests/bpf/test_bpftool.py", 
> line 43, in bpftool_json
>      res = _bpftool(args)
>    File "/root/bpf-next/tools/testing/selftests/bpf/test_bpftool.py", 
> line 34, in _bpftool
>      res = subprocess.run(_args, capture_output=True)
>    File "/usr/lib/python3.6/subprocess.py", line 423, in run
>      with Popen(*popenargs, **kwargs) as process:
> TypeError: __init__() got an unexpected keyword argument 'capture_output'


Apparently the “capture_output” option for subprocess was added to 
python 3.7 [0]. It worked on my system (python 3.7.5) but didn't pass on 
yours with 3.6.

Michal, can you change it to something less recent please, so that 
people don't have to upgrade python to test?

Quentin

[0] https://docs.python.org/3/whatsnew/3.7.html#subprocess