setup.py: add basic packaging files

This is needed to use tox, and tox lets us test multiple Python
versions easily.

Change-Id: I813c418a8f7109294a4adb9f6b21be459cbeca70
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/247173
Reviewed-by: David Pursehouse <dpursehouse@collab.net>
Tested-by: Mike Frysinger <vapier@google.com>

.gitignore

@@ -1,3 +1,6 @@
+*.egg-info/
 *.pyc
+__pycache__
+/dist
 .repopickle_*
 /repoc

MANIFEST.in

@@ -0,0 +1,6 @@
+graft docs hooks tests
+include *.py
+include LICENSE
+include git_ssh
+include repo
+include run_tests

setup.py

@@ -0,0 +1,63 @@
+#!/usr/bin/python
+# -*- coding:utf-8 -*-
+# Copyright 2019 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the 'License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Python packaging for repo."""
+
+from __future__ import print_function
+
+import os
+import setuptools
+
+
+TOPDIR = os.path.dirname(os.path.abspath(__file__))
+
+
+# Rip out the first intro paragraph.
+with open(os.path.join(TOPDIR, 'README.md')) as fp:
+    lines = fp.read().splitlines()[2:]
+    end = lines.index('')
+    long_description = ' '.join(lines[0:end])
+
+
+# https://packaging.python.org/tutorials/packaging-projects/
+setuptools.setup(
+    name='repo',
+    version='1.13.8',
+    maintainer='Various',
+    maintainer_email='repo-discuss@googlegroups.com',
+    description='Repo helps manage many Git repositories',
+    long_description=long_description,
+    long_description_content_type='text/plain',
+    url='https://gerrit.googlesource.com/git-repo/',
+    project_urls={
+        'Bug Tracker': 'https://bugs.chromium.org/p/gerrit/issues/list?q=component:repo',
+    },
+    # https://pypi.org/classifiers/
+    classifiers=[
+        'Development Status :: 6 - Mature',
+        'Environment :: Console',
+        'Intended Audience :: Developers',
+        'License :: OSI Approved :: Apache Software License',
+        'Natural Language :: English',
+        'Operating System :: MacOS :: MacOS X',
+        'Operating System :: Microsoft :: Windows :: Windows 10',
+        'Operating System :: POSIX :: Linux',
+        'Topic :: Software Development :: Version Control :: Git',
+    ],
+    # We support Python 2.7 and Python 3.6+.
+    python_requires='>=2.7, ' + ', '.join('!=3.%i.*' % x for x in range(0, 6)),
+    packages=['subcmds'],
+)