Auto generate AUTHORS for python-openstackclient.

Bug: 976267

Now that git commits are gated by CLA, we shouldn't enforce
committers to add an entry in AUTHORS file. The AUTHORS file
should be generated automatically, based on git commits.

This commit fixes the problem.

* AUTHORS
  Remove this file.

* tests/test_authors.py
  Remove this test case.

* .gitignore
  Add AUTHORS file.

* openstackclient/openstack/common/setup.py
  generate_authors(): New method to create AUTHORS file. If
  AUTHORS.in file exists, append it's content to AUTHORS file.

* setup.py
  Import the new method.
  Generate AUTHORS file before creating the package.

Change-Id: Ia5488a43f88e13a0fb1f7a5d8d10a576b9034dc8

.gitignore

@@ -4,6 +4,7 @@
 *~
 .openstackclient-venv
 .venv
+AUTHORS
 build
 dist
 python_openstackclient.egg-info

openstackclient/openstack/common/setup.py

@@ -37,8 +37,8 @@ def parse_mailmap(mailmap='.mailmap'):
 
 
 def canonicalize_emails(changelog, mapping):
-    """ Takes in a string and an email alias mapping and replaces all
-        instances of the aliases in the string with their real email
+    """Takes in a string and an email alias mapping and replaces all
+       instances of the aliases in the string with their real email.
     """
     for alias, email in mapping.iteritems():
         changelog = changelog.replace(alias, email)
@@ -97,7 +97,7 @@ def _run_shell_command(cmd):
 
 
 def write_vcsversion(location):
-    """ Produce a vcsversion dict that mimics the old one produced by bzr
+    """Produce a vcsversion dict that mimics the old one produced by bzr.
     """
     if os.path.isdir('.git'):
         branch_nick_cmd = 'git branch | grep -Ei "\* (.*)" | cut -f2 -d" "'
@@ -118,7 +118,7 @@ version_info = {
 
 
 def write_git_changelog():
-    """Write a changelog based on the git changelog"""
+    """Write a changelog based on the git changelog."""
     if os.path.isdir('.git'):
         git_log_cmd = 'git log --stat'
         changelog = _run_shell_command(git_log_cmd)
@@ -128,13 +128,18 @@ def write_git_changelog():
 
 
 def generate_authors():
-    """Create AUTHORS file using git commits"""
+    """Create AUTHORS file using git commits."""
     jenkins_email = 'jenkins@review.openstack.org'
+    old_authors = 'AUTHORS.in'
+    new_authors = 'AUTHORS'
     if os.path.isdir('.git'):
         # don't include jenkins email address in AUTHORS file
         git_log_cmd = "git log --format='%aN <%aE>' | sort -u | " \
                       "grep -v " + jenkins_email
         changelog = _run_shell_command(git_log_cmd)
         mailmap = parse_mailmap()
-        with open("AUTHORS", "w") as authors_file:
-            authors_file.write(canonicalize_emails(changelog, mailmap))
+        with open(new_authors, 'w') as new_authors_fh:
+            new_authors_fh.write(canonicalize_emails(changelog, mailmap))
+            if os.path.exists(old_authors):
+                with open(old_authors, "r") as old_authors_fh:
+                    new_authors_fh.write('\n' + old_authors_fh.read())

setup.py

@@ -2,6 +2,7 @@ import os
 
 import setuptools
 
+from openstackclient.openstack.common.setup import generate_authors
 from openstackclient.openstack.common.setup import parse_requirements
 from openstackclient.openstack.common.setup import parse_dependency_links
 from openstackclient.openstack.common.setup import write_git_changelog
@@ -10,6 +11,7 @@ from openstackclient.openstack.common.setup import write_git_changelog
 requires = parse_requirements()
 dependency_links = parse_dependency_links()
 write_git_changelog()
+generate_authors()
 
 
 def read(fname):