[Bug 1890243] Re: Ubuntu autopkgtests is giving me "No module named pyudev" for PYBUILD tests

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~sergiodj/ubuntu/+source/python-rtslib-fb/+git/python-rtslib-fb/+merge/397174

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https://bugs.launchpad.net/bugs/1890243

Title:
  Ubuntu autopkgtests is giving me "No module named pyudev" for PYBUILD
  tests

Status in python-rtslib-fb package in Ubuntu:
  Confirmed

Bug description:
  In the build attempt of version

  https://launchpad.net/ubuntu/+source/python-rtslib-fb/2.1.73-1ubuntu1

  I got:

  ...
  copying rtslib/tcm.py -> /<<PKGBUILDDIR>>/.pybuild/cpython3_3.8/build/rtslib
  copying rtslib/target.py -> /<<PKGBUILDDIR>>/.pybuild/cpython3_3.8/build/rtslib
  copying rtslib/alua.py -> /<<PKGBUILDDIR>>/.pybuild/cpython3_3.8/build/rtslib
  copying rtslib/__init__.py -> /<<PKGBUILDDIR>>/.pybuild/cpython3_3.8/build/rtslib
  copying rtslib/fabric.py -> /<<PKGBUILDDIR>>/.pybuild/cpython3_3.8/build/rtslib
  copying rtslib/root.py -> /<<PKGBUILDDIR>>/.pybuild/cpython3_3.8/build/rtslib
  running build_scripts
  creating build
  creating build/scripts-3.8
  copying and adjusting scripts/targetctl -> build/scripts-3.8
  changing mode of build/scripts-3.8/targetctl from 644 to 755
  make[1]: Leaving directory '/<<PKGBUILDDIR>>'
     dh_auto_test -O--buildsystem=pybuild
  	pybuild --test -i python{version} -p 3.8
  I: pybuild base:217: cd /<<PKGBUILDDIR>>/.pybuild/cpython3_3.8/build; python3.8 -m unittest discover -v 
  rtslib (unittest.loader._FailedTest) ... ERROR
  rtslib_fb (unittest.loader._FailedTest) ... ERROR

  ======================================================================
  ERROR: rtslib (unittest.loader._FailedTest)
  ----------------------------------------------------------------------
  ImportError: Failed to import test module: rtslib
  Traceback (most recent call last):
    File "/usr/lib/python3.8/unittest/loader.py", line 470, in _find_test_path
      package = self._get_module_from_name(name)
    File "/usr/lib/python3.8/unittest/loader.py", line 377, in _get_module_from_name
      __import__(name)
    File "/<<PKGBUILDDIR>>/.pybuild/cpython3_3.8/build/rtslib/__init__.py", line 24, in <module>
      from .root import RTSRoot
    File "/<<PKGBUILDDIR>>/.pybuild/cpython3_3.8/build/rtslib/root.py", line 28, in <module>
      from .node import CFSNode
    File "/<<PKGBUILDDIR>>/.pybuild/cpython3_3.8/build/rtslib/node.py", line 23, in <module>
      from .utils import fread, fwrite, RTSLibError, RTSLibNotInCFS
    File "/<<PKGBUILDDIR>>/.pybuild/cpython3_3.8/build/rtslib/utils.py", line 30, in <module>
      import pyudev
  ModuleNotFoundError: No module named 'pyudev'

  
  ======================================================================
  ERROR: rtslib_fb (unittest.loader._FailedTest)
  ----------------------------------------------------------------------
  ImportError: Failed to import test module: rtslib_fb
  Traceback (most recent call last):
    File "/usr/lib/python3.8/unittest/loader.py", line 470, in _find_test_path
      package = self._get_module_from_name(name)
    File "/usr/lib/python3.8/unittest/loader.py", line 377, in _get_module_from_name
      __import__(name)
    File "/<<PKGBUILDDIR>>/.pybuild/cpython3_3.8/build/rtslib_fb/__init__.py", line 24, in <module>
      from .root import RTSRoot
    File "/<<PKGBUILDDIR>>/.pybuild/cpython3_3.8/build/rtslib_fb/root.py", line 28, in <module>
      from .node import CFSNode
    File "/<<PKGBUILDDIR>>/.pybuild/cpython3_3.8/build/rtslib_fb/node.py", line 23, in <module>
      from .utils import fread, fwrite, RTSLibError, RTSLibNotInCFS
    File "/<<PKGBUILDDIR>>/.pybuild/cpython3_3.8/build/rtslib_fb/utils.py", line 30, in <module>
      import pyudev
  ModuleNotFoundError: No module named 'pyudev'

  
  ----------------------------------------------------------------------
  Ran 2 tests in 0.000s
  ...

  I can't reproduce it locally and I'm able to import related modules.

  I'm disabling PYBUILD test for python3 for it to pass for now...

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