tox jobs are failing to install any sibling python packages

[Ronelle Landy]

tox jobs are failing the 'tox : Install any sibling python packages' step:

2021-09-30 16:53:28.264111 | ubuntu-focal | MODULE FAILURE:
2021-09-30 16:53:28.264740 | ubuntu-focal | Traceback (most recent call last):
2021-09-30 16:53:28.264885 | ubuntu-focal | File "<stdin>", line 102, in <module>
2021-09-30 16:53:28.265021 | ubuntu-focal | File "<stdin>", line 94, in _ansiballz_main
2021-09-30 16:53:28.265159 | ubuntu-focal | File "<stdin>", line 40, in invoke_module
2021-09-30 16:53:28.265293 | ubuntu-focal | File "/usr/lib/python3.8/runpy.py", line 207, in run_module
2021-09-30 16:53:28.265426 | ubuntu-focal | return _run_module_code(code, init_globals, run_name, mod_spec)
2021-09-30 16:53:28.265559 | ubuntu-focal | File "/usr/lib/python3.8/runpy.py", line 97, in _run_module_code
2021-09-30 16:53:28.265693 | ubuntu-focal | _run_code(code, mod_globals, init_globals,
2021-09-30 16:53:28.265826 | ubuntu-focal | File "/usr/lib/python3.8/runpy.py", line 87, in _run_code
2021-09-30 16:53:28.265958 | ubuntu-focal | exec(code, run_globals)
2021-09-30 16:53:28.266090 | ubuntu-focal | File "/tmp/ansible_tox_install_sibling_packages_payload_gd22cu17/ansible_tox_install_sibling_packages_payload.zip/ansible/modules/tox_install_sibling_packages.py", line 399, in <module>
2021-09-30 16:53:28.266223 | ubuntu-focal | File "/tmp/ansible_tox_install_sibling_packages_payload_gd22cu17/ansible_tox_install_sibling_packages_payload.zip/ansible/modules/tox_install_sibling_packages.py", line 330, in main
2021-09-30 16:53:28.266419 | ubuntu-focal | File "/usr/lib/python3.8/configparser.py", line 723, in read_string
2021-09-30 16:53:28.266561 | ubuntu-focal | self.read_file(sfile, source)
2021-09-30 16:53:28.266697 | ubuntu-focal | File "/usr/lib/python3.8/configparser.py", line 718, in read_file
2021-09-30 16:53:28.266830 | ubuntu-focal | self._read(f, source)
2021-09-30 16:53:28.266962 | ubuntu-focal | File "/usr/lib/python3.8/configparser.py", line 1113, in _read
2021-09-30 16:53:28.267093 | ubuntu-focal | raise e
2021-09-30 16:53:28.267223 | ubuntu-focal | configparser.ParsingError: Source contains parsing errors: '<string>'
2021-09-30 16:53:28.267353 | ubuntu-focal | [line 3]: 'using tox-3.24.4 from /home/zuul/src/opendev.org/openstack/tripleo-heat-templates/.tox/.tox/lib/python3.8/site-packages/tox/__init__.py (pid 1818)\n'
2021-09-30 16:53:28.291974 |

This is breaking check/gate across repos.

[Ronelle Landy (rlandy)]

Example log:
https://storage.bhs.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_3a4/790954/3/gate/openstack-tox-pep8/3a45a55/job-output.txt

[Ronelle Landy (rlandy)]

Example logs:

using tox-3.24.4 from /home/zuul/src/opendev.org/openstack/tripleo-quickstart-extras/.tox/.tox/lib/python3.8/site-packages/tox/__init__.py (pid 1747)\n'
2021-09-30 17:29:06.477701 |

[Ronelle Landy (rlandy)]

Failing code is in zuul-jobs: https://opendev.org/zuul/zuul-jobs/src/branch/master/roles/tox/tasks/siblings.yaml#L38

[Ronelle Landy (rlandy)]

Thanks to infra for the fix:

<fungi> according to zbr there's a *very* recent fix to tox which tries to guarantee the stdout from tox --showconfig will be parseable ini data, but we need to be able to parse output from older tox versions as well
<fungi> clarkb: rlandy|ruck: i've got a revert on the way, when gerrit finally accepts my push

[Ronelle Landy (rlandy)]

 https://review.opendev.org/812001