CI: Fix our usage of tox

For tox 3.x and earlier, passenv was a space-separated list; as of tox
4.0.0, it's comma-separated. For a while, our spaces would be silently
included in the now-one-and-only passenv value parsed (which wasn't
great, but mostly just caused confusion) -- as of tox 4.0.6, however, it
became a hard error, and all tests would fail like

  pass_env values cannot contain whitespace, use comma to have multiple
  values in a single line, invalid values found 'SWIFT_* *_proxy'

Unfortunately, we don't really know what versions of tox all our various
stakeholders might want/need to use (though we previously set a
minversion of 2.3.2). We might be able to spread values over multiple
lines to make it compatible with both tox 3 *and* tox 4, but I'm fairly
certain *_proxy was only included for some variables that are recent
versions of tox include by default anyway, so just increase our
minversion (which was too low, anyway -- allowlist_externals which we
already configure was added in 3.18.0) and get rid of *_proxy.

FWIW, python-swiftclient was already specifying 3.18.0 as a minversion,
so I expect the new minversion to not be a problem.

Also, add ./.functests to a bunch of allowlist_externals, as newer tox
is more strict about that sort of thing.

Drop skipsdist in a bunch of places so we can import swift from func
tests and docs. (Still not sure why I don't see us hitting a similar
problem for unit tests...)

Change-Id: I4be1e86e3291ad1619c695fb93d7cadf053b556d

.zuul.yaml

@@ -528,6 +528,8 @@
       python_version: 2.7
       tox_environment:
         TMPDIR: '{{ ansible_env.HOME }}/xfstmp'
+      # This seems defensible for a l-c job
+      ensure_tox_version: '<4'
 
 # Image building jobs
 - secret:

py2-constraints.txt

@@ -78,3 +78,4 @@ smmap===3.0.5
 PasteDeploy==2.1.1
 pytest==4.6.11
 pytest-cov==2.12.1
+attrs==21.4.0

tools/playbooks/common/install_dependencies.yaml

@@ -39,8 +39,10 @@
         # trying to install a too-new mock or attrs??
         - 'mock<4'
         - 'attrs<22.1.0'
+        # crudini pulls in iniparse which can conflict with distro-installed
+        # packages on centos7
+        - 'crudini<0.9.4'
         # Order matters; install constrained versions *first*, then unconstrained
-        - crudini
         - eventlet
         - pyeclib
         - pytest

tox.ini

@@ -1,7 +1,6 @@
 [tox]
 envlist = py37,py27,pep8
-minversion = 2.3.2
-skipsdist = True
+minversion = 3.18.0
 
 [pytest]
 addopts = --verbose --cov=swift --cov-branch --cov-report=html:cover --cov-report term
@@ -21,14 +20,18 @@ commands =
 allowlist_externals =
   bash
   find
-passenv = SWIFT_* *_proxy
+passenv = SWIFT_*
 
 [testenv:s3api]
 usedevelop = False
 deps = {[testenv:py36]deps}
 commands =
   pytest {posargs:test/s3api}
-passenv = SWIFT_* *_proxy
+passenv = SWIFT_*
+# For some reason we hit some EPERM issue when building the package for these tests?
+# (CentOS 8, CPython 3.6, tox 3.28.0)
+skipsdist = True
+skip_install = True
 
 [testenv:py27]
 deps =
@@ -49,6 +52,8 @@ deps = {[testenv:py36]deps}
 setenv = VIRTUAL_ENV={envdir}
 
 [testenv:pep8]
+allowlist_externals =
+  ./.manpages
 commands =
   flake8 {posargs:swift test doc setup.py}
   flake8 --filename=bin/swift* bin
@@ -59,11 +64,15 @@ commands =
 [testenv:func-py3]
 basepython = python3
 deps = {[testenv:py36]deps}
+allowlist_externals =
+  ./.functests
 commands = ./.functests {posargs}
 
 [testenv:func-ec-py3]
 basepython = python3
 deps = {[testenv:py36]deps}
+allowlist_externals =
+  ./.functests
 commands = ./.functests {posargs}
 setenv = SWIFT_TEST_IN_PROCESS=1
          SWIFT_TEST_IN_PROCESS_CONF_LOADER=ec
@@ -71,6 +80,8 @@ setenv = SWIFT_TEST_IN_PROCESS=1
 [testenv:func-encryption-py3]
 basepython = python3
 deps = {[testenv:py36]deps}
+allowlist_externals =
+  ./.functests
 commands = ./.functests {posargs}
 setenv = SWIFT_TEST_IN_PROCESS=1
          SWIFT_TEST_IN_PROCESS_CONF_LOADER=encryption
@@ -78,11 +89,15 @@ setenv = SWIFT_TEST_IN_PROCESS=1
 [testenv:func]
 basepython = python2.7
 deps = {[testenv:py27]deps}
+allowlist_externals =
+  ./.functests
 commands = ./.functests {posargs}
 
 [testenv:func-encryption]
 basepython = python2.7
 deps = {[testenv:py27]deps}
+allowlist_externals =
+  ./.functests
 commands = ./.functests {posargs}
 setenv = SWIFT_TEST_IN_PROCESS=1
          SWIFT_TEST_IN_PROCESS_CONF_LOADER=encryption
@@ -90,6 +105,8 @@ setenv = SWIFT_TEST_IN_PROCESS=1
 [testenv:func-ec]
 basepython = python2.7
 deps = {[testenv:py27]deps}
+allowlist_externals =
+  ./.functests
 commands = ./.functests {posargs}
 setenv = SWIFT_TEST_IN_PROCESS=1
          SWIFT_TEST_IN_PROCESS_CONF_LOADER=ec
@@ -166,6 +183,9 @@ deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt
   -r{toxinidir}/requirements.txt
+# Drop the --upgrade flag so we don't accidentally drag anything forward when
+# we install swift
+install_command = pip install {opts} {packages}
 
 [testenv:pdf-docs]
 basepython = python3