📦 Substitute pbr with setuptools-scm

Also:
* 🎨 include a shim to simulate setuptools' ability to read data from
``setup.cfg`` under ancient envs.
* ⬆️ BSpecify project stability in metadata properly
* ⬆️ Bump required tox to v3.8.4
* 🎨 Retrieve Molecule version using pkg_resources
* 🐛 Whitelist find in tox in build-dists
* 🎨 Enable isolated build in tox
* 🔥 Drop Ansible 2.4 factor ref from tox
* ⬆️ Bump setuptools req to v41.0.0
* 🎨 Wire up tox build-dists env into Travis CI

Author: webknjaz

.travis.yml

@@ -429,7 +429,9 @@ jobs:
     name: Publishing current Git tagged version of dist to PyPI
     if: repo == "ansible/molecule" AND tag IS present
     env:
-      TOXENV: metadata-validation
+      TOXENV: metadata-validation,build-dists
+    before_deploy:
+    - echo > setup.py
     deploy: &deploy-step
       provider: pypi
       user: ansible-molecule

MANIFEST.in

@@ -1,3 +1,4 @@
+#  Copyright (c) 2019 Red Hat, Inc.
 #  Copyright (c) 2015-2018 Cisco Systems, Inc.
 #
 #  Permission is hereby granted, free of charge, to any person obtaining a copy
@@ -17,8 +18,13 @@
 #  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 #  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 #  DEALINGS IN THE SOFTWARE.
+"""Molecule version information."""
 
-import pbr.version
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
 
-version_info = pbr.version.VersionInfo('molecule')  # noqa
-__version__ = version_info.release_string()
+try:
+    import pkg_resources
+    __version__ = pkg_resources.get_distribution('molecule').version
+except Exception:
+    __version__ = 'unknown'

lint-requirements.txt

@@ -0,0 +1,8 @@
+[build-system]
+requires = [
+  "setuptools >= 41.0.0",
+  "setuptools_scm >= 1.15.0",
+  "setuptools_scm_git_archive >= 1.0",
+  "wheel",
+]
+build-backend = "setuptools.build_meta"

molecule/__init__.py

@@ -1,17 +1,12 @@
 [aliases]
 dists = clean --all sdist bdist_wheel
 
+[bdist_wheel]
+universal = 1
+
 [metadata]
 name = molecule
-author = Ansible by Red Hat
-author-email = [email protected]
-maintainer = Ansible by Red Hat
-maintainer-email = [email protected]
-summary = Molecule aids in the development and testing of Ansible roles.
-license = MIT
-description-file = README.rst
-home-page = https://github.com/ansible/molecule
-requires-python = >=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*
+url = https://github.com/ansible/molecule
 project_urls =
     Bug Tracker = https://github.com/ansible/molecule/issues
     Release Management = https://github.com/ansible/molecule/projects
@@ -20,28 +15,80 @@ project_urls =
     Documentation = https://molecule.readthedocs.io
     Mailing lists = https://docs.ansible.com/ansible/latest/community/communication.html#mailing-list-information
     Source Code = https://github.com/ansible/molecule
-classifier =
-    Development Status :: 4 - Beta
+description = Molecule aids in the development and testing of Ansible roles
+long_description = file: README.rst
+author = Ansible by Red Hat
+author_email = [email protected]
+maintainer = Ansible by Red Hat
+maintainer_email = [email protected]
+license = MIT
+license_file = LICENSE
+classifiers =
+    Development Status :: 5 - Production/Stable
+
     Environment :: Console
+
     Intended Audience :: Developers
     Intended Audience :: Information Technology
     Intended Audience :: System Administrators
+
     License :: OSI Approved :: MIT License
+
     Natural Language :: English
+
     Operating System :: OS Independent
+
     Programming Language :: Python :: 2
     Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.5
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
+
     Topic :: System :: Systems Administration
     Topic :: Utilities
+keywords =
+    ansible
+    roles
+    testing
+    molecule
+
+[options]
+use_scm_version = True
+python_requires = >=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*
+package_dir =
+    = .
+packages = find:
+zip_safe = False
+
+# These are required during `setup.py` run:
+setup_requires =
+    setuptools_scm >= 1.15.0
+    setuptools_scm_git_archive >= 1.0
+
+# These are required in actual runtime:
+install_requires =
+    ansible >= 2.5
+    ansible-lint >= 4.0.2, < 5
 
-# setuptools section name:
-# [options.extras_require]
-# PBR way:
-[extras]
+    anyconfig == 0.9.7
+    cerberus >= 1.2, < 3
+    click == 6.7
+    click-completion == 0.3.1
+    colorama == 0.3.9
+    cookiecutter == 1.6.0
+    python-gilt >= 1.2.1, < 2
+    Jinja2 == 2.10
+    pexpect >= 4.6.0, < 5
+    psutil == 5.4.6; sys_platform!="win32" and sys_platform!="cygwin"
+    PyYAML == 3.13
+    sh == 1.12.14
+    six == 1.11.0
+    tabulate == 0.8.2
+    testinfra == 1.19.0
+    tree-format==0.1.2
+
+[options.extras_require]
 docs =
     alabaster
     Sphinx
@@ -65,19 +112,14 @@ vagrant =
 windows =
     pywinrm
 
-[pbr]
-skip_authors = True
-skip_changelog = True
-warnerrors = True
-
-[entry_points]
+[options.entry_points]
 console_scripts =
-    molecule = molecule.shell:main
+    molecule = molecule.__main__:main
+
+[options.packages.find]
+where = .
 
 [build_sphinx]
 all_files = 1
 build-dir = doc/build
 source-dir = doc/source
-
-[wheel]
-universal = 1