netdev - Re: [PATCH bpf] selftest/bpf: make bpftool if it is not already built

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Date:   Tue, 18 Aug 2020 13:14:29 +0530
From:   Balamuruhan S <bala24@...ux.ibm.com>
To:     Yonghong Song <yhs@...com>, bpf@...r.kernel.org
Cc:     netdev@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        naveen.n.rao@...ux.vnet.ibm.com, ravi.bangoria@...ux.ibm.com,
        sandipan@...ux.ibm.com, kafai@...com, songliubraving@...com,
        andriin@...com, john.fastabend@...il.com, kpsingh@...omium.org
Subject: Re: [PATCH bpf] selftest/bpf: make bpftool if it is not already
 built

On Fri, 2020-08-14 at 09:01 -0700, Yonghong Song wrote:
> 
> On 8/14/20 1:57 AM, Balamuruhan S wrote:
> > test_bpftool error out if bpftool is not available in bpftool dir
> > linux/tools/bpf/bpftool, build and clean it as part of test
> > bootstrap and teardown.
> > 
> > Error log:
> > ---------
> > 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
> > "/home/ubuntu/disk/linux/tools/testing/selftests/bpf/test_bpftool.py",
> >      return f(*args, iface, **kwargs)
> >    File
> > "/home/ubuntu/disk/linux/tools/testing/selftests/bpf/test_bpftool.py",
> >      res = bpftool_json(["feature", "probe", "dev", iface])
> >    File
> > "/home/ubuntu/disk/linux/tools/testing/selftests/bpf/test_bpftool.py",
> >      res = _bpftool(args)
> >    File
> > "/home/ubuntu/disk/linux/tools/testing/selftests/bpf/test_bpftool.py",
> >      return subprocess.check_output(_args)
> >    File "/usr/lib/python3.8/subprocess.py", line 411, in check_output
> >      return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
> >    File "/usr/lib/python3.8/subprocess.py", line 489, in run
> >      with Popen(*popenargs, **kwargs) as process:
> >    File "/usr/lib/python3.8/subprocess.py", line 854, in __init__
> >      self._execute_child(args, executable, preexec_fn, close_fds,
> >    File "/usr/lib/python3.8/subprocess.py", line 1702, in _execute_child
> >      raise child_exception_type(errno_num, err_msg, err_filename)
> > FileNotFoundError: [Errno 2] No such file or directory: 'bpftool'
> > 
> > Signed-off-by: Balamuruhan S <bala24@...ux.ibm.com>
> > ---
> >   tools/testing/selftests/bpf/test_bpftool.py | 13 +++++++++++++
> >   1 file changed, 13 insertions(+)
> > 
> > diff --git a/tools/testing/selftests/bpf/test_bpftool.py
> > b/tools/testing/selftests/bpf/test_bpftool.py
> > index 4fed2dc25c0a..60357c6891a6 100644
> > --- a/tools/testing/selftests/bpf/test_bpftool.py
> > +++ b/tools/testing/selftests/bpf/test_bpftool.py
> > @@ -58,12 +58,25 @@ def default_iface(f):
> >       return wrapper
> >   
> >   
> > +def make_bpftool(clean=False):
> > +    cmd = "make"
> > +    if clean:
> > +        cmd = "make clean"
> > +    return subprocess.run(cmd, shell=True, cwd=bpftool_dir, check=True,
> > +                          stdout=subprocess.DEVNULL)
> > +
> >   class TestBpftool(unittest.TestCase):
> >       @classmethod
> >       def setUpClass(cls):
> >           if os.getuid() != 0:
> >               raise UnprivilegedUserError(
> >                   "This test suite needs root privileges")
> > +        if subprocess.getstatusoutput("bpftool -h")[0]:
> > +            make_bpftool()
> > +
> > +    @classmethod
> > +    def tearDownClass(cls):
> > +        make_bpftool(clean=True)
> 
> I think make_bpftool clean should only be called if the make actually
> triggered during setUpClass, right?

yes, I will fix it in the next version.

> 
> >   
> >       @default_iface
> >       def test_feature_dev_json(self, iface):
> > 
> > base-commit: 6e868cf355725fbe9fa512d01b09b8ee7f3358f0
> >