Remove dependency on setuptools (#3221)

Fixes: #3219

mypy.ini

@@ -31,9 +31,6 @@ ignore_missing_imports = True
 [mypy-ruamel]
 ignore_missing_imports = True
 
-[mypy-setuptools]
-ignore_missing_imports = True
-
 [mypy-testinfra.*]
 ignore_missing_imports = True
 

setup.cfg

@@ -73,14 +73,14 @@ install_requires =
     cookiecutter >= 1.7.3  # dependency issues in older versions
     dataclasses; python_version<"3.7"
     enrich >= 1.2.5
+    importlib-metadata<2; python_version<"3.8"
     Jinja2 >= 2.11.3
     packaging
     paramiko >= 2.5.0, < 3
     pluggy >= 0.7.1, < 1.0
     PyYAML >= 5.1, < 6
     rich >= 9.5.1
     subprocess-tee >= 0.3.2
-    setuptools >= 42 # for pkg_resources
     # selinux python module is needed as least by ansible-docker/podman modules
     # and allows us of isolated (default) virtualenvs. It does not avoid need
     # to install the system selinux libraries but it will provide a clear

src/molecule/__init__.py

@@ -23,10 +23,11 @@
 from __future__ import absolute_import, division, print_function
 
 __metaclass__ = type
-
 try:
-    import pkg_resources
+    # py38+
+    from importlib.metadata import version  # type: ignore
+except ImportError:
+    # py36-py37
+    from importlib_metadata import version
 
-    __version__ = pkg_resources.get_distribution("molecule").version
-except Exception:
-    __version__ = "unknown"
+__version__ = version("molecule")

src/molecule/driver/base.py

@@ -24,8 +24,6 @@
 from abc import ABCMeta, abstractmethod
 from typing import Dict
 
-import pkg_resources
-
 import molecule
 from molecule.status import Status
 
@@ -45,7 +43,7 @@ def __init__(self, config=None):
         self._config = config
         self._path = os.path.abspath(os.path.dirname(inspect.getfile(self.__class__)))
         self.module = self.__module__.split(".", maxsplit=1)[0]
-        self.version = pkg_resources.get_distribution(self.module).version
+        self.version = molecule.version(self.module)
 
     @property
     @abstractmethod

src/molecule/shell.py

@@ -23,7 +23,7 @@
 import sys
 
 import click
-import pkg_resources
+import packaging
 from ansible_compat.runtime import Runtime
 
 import molecule
@@ -56,7 +56,7 @@ def print_version(ctx, param, value):
     if not value or ctx.resilient_parsing:
         return
 
-    v = pkg_resources.parse_version(molecule.__version__)
+    v = packaging.version.Version(molecule.__version__)
     color = "bright_yellow" if v.is_prerelease else "green"
     msg = f"molecule [{color}]{v}[/] using python [repr.number]{sys.version_info[0]}.{sys.version_info[1]}[/] \n"
 

src/molecule/test/functional/conftest.py

@@ -26,11 +26,11 @@
 from typing import Optional
 
 import pexpect
-import pkg_resources
 import pytest
 from ansible_compat.runtime import Runtime
 from packaging.version import Version
 
+import molecule
 from molecule import logger, util
 from molecule.test.conftest import change_dir_to, molecule_directory
 from molecule.text import strip_ansi_color
@@ -47,8 +47,8 @@
 @pytest.fixture(scope="session", autouse=True)
 def require_installed_package():
     try:
-        pkg_resources.require("molecule")
-    except pkg_resources.DistributionNotFound as e:
+        molecule.version("molecule")
+    except Exception as e:
         pytest.fail(
             "Functional tests require molecule package to be installed: {}".format(e)
         )