Nova tox.ini modified to show what it can look like if we get {posargs} in section substitution.

tox.ini

[tox]
minversion = 2.0
envlist = py34,py27,functional,pep8,pip-missing-reqs
skipsdist = True

[testenv]
usedevelop = True
# tox is silly... these need to be separated by a newline....
whitelist_externals = bash
                      find
                      rm
install_command =
                  constraints: {[testenv:common-constraints]install_command}
                  unconstrained: pip install -U --force-reinstall {opts} {packages}
                  pip install -U --force-reinstall {opts} {packages}
setenv = VIRTUAL_ENV={envdir}
         OS_TEST_PATH=./nova/tests/unit
         LANGUAGE=en_US
         LC_ALL=en_US.utf-8
         functional: OS_TEST_PATH=./nova/tests/functional
         api-samples: {[substitutions]apisamplesenv}
# TODO(mriedem): Move oslo.versionedobjects[fixtures] to test-requirements.txt
#                after I937823ffeb95725f0b55e298ebee1857d6482883 lands.
deps = -r{toxinidir}/test-requirements.txt
       oslo.versionedobjects[fixtures]
commands =
  py27,functional,api-samples: {[substitutions]test}
  py34: {[substitutions]py34}
  pep8: {[substitutions]pep8}
  cover: {[substitutions]cover}
  venv: {posargs}
  docs: {[substitutions]docs}
  bandit: bandit -c bandit.yaml -r nova -n 5 -ll
  genconfig: oslo-config-generator --config-file=etc/nova/nova-config-generator.conf
  api-guide: sphinx-build -b html -d api-guide/build/doctrees api-guide/source api-guide/build/html
  releasenotes: {[substitutions]releasenotes}
passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
# there is also secret magic in pretty_tox.sh which lets you run in a fail only
# mode. To do this define the TRACE_FAILONLY environmental variable.

[testenv:common-constraints]
install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}

[substitutions]
test = 
  find . -type f -name "*.pyc" -delete
  bash tools/pretty_tox.sh '{posargs}'
pep8 = 
  bash tools/flake8wrap.sh {posargs}
  # Check that .po and .pot files are valid.
  bash -c "find nova -type f -regex '.*\.pot?' -print0| \
           xargs -0 -n 1 msgfmt --check-format -o /dev/null"
py34 =
  find . -type f -name "*.pyc" -delete
  ostestr --blacklist_file tests-py3.txt
cover =
  coverage erase
  python setup.py testr --coverage \
    --testr-args='{posargs}'
  coverage combine
  coverage html --include='nova/*' --omit='nova/openstack/common/*' -d covhtml -i
docs =
  rm -rf doc/source/api doc/build api-guide/build
  python setup.py build_sphinx
  bash -c '! find doc/ -type f -name *.json | xargs -t -n1 python -m json.tool 2>&1 > /dev/null | grep -B1 -v ^python'
  oslo-config-generator --config-file=etc/nova/nova-config-generator.conf
  sphinx-build -b html api-guide/source api-guide/build/html
releasenotes =
  rm -rf releasenotes/build
  sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
apisamplesenv = 
       GENERATE_SAMPLES=True
       PYTHONHASHSEED=0
       OS_TEST_PATH=./nova/tests/functional/api_sample_tests

[flake8]
# E125 is deliberately excluded. See https://github.com/jcrocholl/pep8/issues/126
# The rest of the ignores are TODOs
# New from hacking 0.9: E129, E131, H407, H405
# E251 Skipped due to https://github.com/jcrocholl/pep8/issues/301

ignore = E121,E122,E123,E124,E125,E126,E127,E128,E129,E131,E251,H405
exclude =  .venv,.git,.tox,dist,doc,*openstack/common/*,*lib/python*,*egg,build,tools/xenserver*,releasenotes
# To get a list of functions that are more complex than 25, set max-complexity
# to 25 and run 'tox -epep8'.
# 34 is currently the most complex thing we have
# TODO(jogo): get this number down to 25 or so
max-complexity=35

[hacking]
local-check-factory = nova.hacking.checks.factory
import_exceptions = nova.i18n

[testenv:pip-missing-reqs]
# do not install test-requirements as that will pollute the virtualenv for
# determining missing packages
# this also means that pip-missing-reqs must be installed separately, outside
# of the requirements.txt files
deps = pip_missing_reqs
commands=pip-missing-reqs -d --ignore-file=nova/tests/* --ignore-file=nova/test.py nova