Switch away from deprecated distribution lookup

Python 3.8 removed the linux_distribution support, we need
to switch to the distro package.

To pass testing, we need to update to a newer flake8 version.
Also update setuptools annotation since Python 2.x support
has been dropped.

Change-Id: I40768af80ff376866b1070026a93fd3f4bb1c2e4

pymod2pkg/__init__.py

@@ -13,7 +13,7 @@
 from __future__ import print_function
 
 import argparse
-import platform
+import distro
 import re
 
 
@@ -340,17 +340,19 @@ OPENSTACK_UPSTREAM_PKG_MAP = [
 
 
 def get_pkg_map(dist):
-    if dist.lower().find('suse') != -1:
+    d_lower = dist.lower()
+    if 'suse' in d_lower or 'sles' in d_lower:
         return SUSE_PKG_MAP
-    if dist.lower().find('ubuntu') != -1:
+    if 'ubuntu' in d_lower:
         return UBUNTU_PKG_MAP
     return RDO_PKG_MAP
 
 
 def get_default_tr_func(dist):
-    if dist.lower().find('suse') != -1:
+    d_lower = dist.lower()
+    if 'suse' in d_lower or 'sles' in d_lower:
         return default_suse_tr
-    if dist.lower().find('ubuntu') != -1:
+    if 'ubuntu' in d_lower:
         return default_ubuntu_tr
     return default_rdo_tr
 
@@ -360,7 +362,7 @@ def module2package(mod, dist, pkg_map=None, py_vers=('py',)):
 
     mod: python module name
     dist: a linux distribution as returned by
-          `platform.linux_distribution()[0]`
+          `distro.LinuxDistribution().id().partition(' ')[0]`
     pkg_map: a custom package mapping. None means autodetected based on the
              given dist parameter
     py_vers: a list of python versions the function should return. Default is
@@ -412,9 +414,9 @@ def main():
     parser = argparse.ArgumentParser(description='Python module name to'
                                      'package name')
     group = parser.add_mutually_exclusive_group()
-    group.add_argument('--dist', help='distribution style '
-                       '(default: %(default)s)',
-                       default=platform.linux_distribution()[0])
+    group.add_argument(
+        '--dist', help='distribution style (default: %(default)s)',
+        default=distro.LinuxDistribution().id().partition(' ')[0])
     group.add_argument('--upstream', help='map to OpenStack project name',
                        action='store_true')
     parser.add_argument('--pyver', help='Python versions to return. "py" is '

requirements.txt

@@ -1,4 +1,5 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
+distro
 pbr!=2.1.0,>=2.0.0 # Apache-2.0

setup.cfg

@@ -7,11 +7,10 @@ author = OpenStack
 author-email = openstack-discuss@lists.openstack.org
 home-page = https://docs.openstack.org/pymod2pkg/latest/
 classifier =
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
     Intended Audience :: Developers
     License :: OSI Approved :: Apache Software License
     Topic :: Software Development :: Libraries

test-requirements.txt

@@ -5,5 +5,5 @@ stestr>=2.0.0 # Apache-2.0
 testresources>=2.0.0 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT
 
-sphinx!=1.6.6,!=1.6.7,>=1.6.2  # BSD
+sphinx!=1.6.6,!=1.6.7;python_version>='3.4'  # BSD
 openstackdocstheme>=1.18.1 # Apache-2.0

tox.ini

@@ -20,7 +20,7 @@ commands = stestr run {posargs}
 
 [testenv:pep8]
 deps = {[testenv]deps}
-    flake8<3.7.0,>=3.6.0
+    flake8<3.8.0,>=3.7.0
 commands = flake8
 
 [testenv:venv]