Switch to tox 4 (#1020)

* Update tox.ini to work with tox 4

- remove `skipsdist = True` (tox 4 will not install bandit with this setting, not even in editable mode for environments where `usedevelop = True` is set), add `skip_install = true` to the pep8 job
- remove `requires = tox<4`
- use multi-line list for `passenv`
- add the `-` mark to ignore pylint exit code in the pep8 job - although this mark is already present in `[testenv:pylint]`, tox 4 ignores it when using the `{[testenv:pylint]commands}` substitution

* Use the `tox run` command

In tox 4, environments should always be specified using the -e flag to the `run` subcommand. https://tox.wiki/en/4.4.11/upgrading.html#updating-usage-with-e

.github/workflows/pythonpackage.yml

@@ -22,7 +22,7 @@ jobs:
         pip install -r test-requirements.txt
         pip install tox
     - name: Run tox
-      run: tox -e format
+      run: tox run -e format
 
   pep8:
     runs-on: ubuntu-latest
@@ -45,7 +45,7 @@ jobs:
         pip install -r test-requirements.txt
         pip install tox
     - name: Run tox
-      run: tox -e pep8
+      run: tox run -e pep8
 
   tests:
     strategy:
@@ -70,4 +70,4 @@ jobs:
         pip install -r test-requirements.txt
         pip install tox
     - name: Run tox
-      run: tox -e py${{ matrix.python-version[1] }}
+      run: tox run -e py${{ matrix.python-version[1] }}

CONTRIBUTING.md

@@ -63,10 +63,10 @@ You can test any changes with tox:
 
 ```shell script
 pip install tox
-tox -e pep8
-tox -e py37
-tox -e docs
-tox -e cover
+tox run -e pep8
+tox run -e py37
+tox run -e docs
+tox run -e cover
 ```
 If everything is done, proceed with [opening a new pull request](https://help.github.com/en/desktop/contributing-to-projects/creating-a-pull-request)
 

tox.ini

@@ -1,9 +1,6 @@
 [tox]
 minversion = 3.2.0
 envlist = py37,pep8
-skipsdist = True
-requires =
-    tox<4
 
 [testenv]
 usedevelop = True
@@ -18,7 +15,13 @@ commands =
     stestr run {posargs}
 allowlist_externals =
     find
-passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
+passenv =
+    http_proxy
+    HTTP_PROXY
+    https_proxy
+    HTTPS_PROXY
+    no_proxy
+    NO_PROXY
 
 [testenv:debug]
 commands = oslo_debug_helper -t tests {posargs}
@@ -31,13 +34,14 @@ commands = flake8 {posargs} bandit
            bandit-baseline -r bandit -ll -ii
 
 [testenv:pep8]
+skip_install = true
 ignore_errors = true
 deps = {[testenv]deps}
        .
 usedevelop = False
 commands = flake8 {posargs} bandit
            flake8 {posargs} tests
-           {[testenv:pylint]commands}
+           -{[testenv:pylint]commands}
            bandit-baseline -r bandit -ll -ii
 
 [testenv:venv]