Fix functional tests and tox 2.0 errors

With the recent update to tox 2.0.x, environment variables such as
OS_AUTH_URL are not passed by default, resulting in tests errors
mentionning Keystone authentication failures.

This patch reads credentials from the 'functional_creds.conf' config
file, like it is done in novaclient, glanceclient, manilaclient and
soon in cinderclient.

Reading credentials the old way (the environment) is still possible.

Change-Id: Ief0f050044ecd90a14bbaf044e2b93ade0a6173f
Closes-Bug: #1455102

functional_creds.conf.sample

@@ -0,0 +1,8 @@
+# Credentials for functional testing
+[auth]
+uri = http://10.42.0.50:5000/v2.0
+
+[admin]
+user = admin
+tenant = admin
+pass = secrete

neutronclient/tests/functional/base.py

@@ -12,9 +12,44 @@
 
 import os
 
+from six.moves import configparser
 from tempest_lib.cli import base
 
 
+_CREDS_FILE = 'functional_creds.conf'
+
+
+def credentials():
+    """Retrieves credentials to run functional tests
+
+    Credentials are either read from the environment or from a config file
+    ('functional_creds.conf'). Environment variables override those from the
+    config file.
+
+    The 'functional_creds.conf' file is the clean and new way to use (by
+    default tox 2.0 does not pass environment variables).
+    """
+
+    username = os.environ.get('OS_USERNAME')
+    password = os.environ.get('OS_PASSWORD')
+    tenant_name = os.environ.get('OS_TENANT_NAME')
+    auth_url = os.environ.get('OS_AUTH_URL')
+
+    config = configparser.RawConfigParser()
+    if config.read(_CREDS_FILE):
+        username = username or config.get('admin', 'user')
+        password = password or config.get('admin', 'pass')
+        tenant_name = tenant_name or config.get('admin', 'tenant')
+        auth_url = auth_url or config.get('auth', 'uri')
+
+    return {
+        'username': username,
+        'password': password,
+        'tenant_name': tenant_name,
+        'auth_url': auth_url
+    }
+
+
 class ClientTestBase(base.ClientTestBase):
     """This is a first pass at a simple read only python-neutronclient test.
     This only exercises client commands that are read only.
@@ -28,16 +63,15 @@ class ClientTestBase(base.ClientTestBase):
     """
 
     def _get_clients(self):
+        creds = credentials()
         cli_dir = os.environ.get(
             'OS_NEUTRONCLIENT_EXEC_DIR',
             os.path.join(os.path.abspath('.'), '.tox/functional/bin'))
-
-        return base.CLIClient(
-            username=os.environ.get('OS_USERNAME'),
-            password=os.environ.get('OS_PASSWORD'),
-            tenant_name=os.environ.get('OS_TENANT_NAME'),
-            uri=os.environ.get('OS_AUTH_URL'),
-            cli_dir=cli_dir)
+        return base.CLIClient(username=creds['username'],
+                              password=creds['password'],
+                              tenant_name=creds['tenant_name'],
+                              uri=creds['auth_url'],
+                              cli_dir=cli_dir)
 
     def neutron(self, *args, **kwargs):
         return self.clients.neutron(*args,

neutronclient/tests/functional/hooks/post_test_hook.sh

@@ -28,15 +28,28 @@ function generate_testr_results {
 
 export NEUTRONCLIENT_DIR="$BASE/new/python-neutronclient"
 
+sudo chown -R jenkins:stack $NEUTRONCLIENT_DIR
+
 # Get admin credentials
 cd $BASE/new/devstack
 source openrc admin admin
 
+# Store these credentials into the config file
+CREDS_FILE=$NEUTRONCLIENT_DIR/functional_creds.conf
+cat <<EOF > $CREDS_FILE
+# Credentials for functional testing
+[auth]
+uri = $OS_AUTH_URL
+
+[admin]
+user = $OS_USERNAME
+tenant = $OS_TENANT_NAME
+pass = $OS_PASSWORD
+EOF
+
 # Go to the neutronclient dir
 cd $NEUTRONCLIENT_DIR
 
-sudo chown -R jenkins:stack $NEUTRONCLIENT_DIR
-
 # Run tests
 echo "Running neutronclient functional test suite"
 set +e

neutronclient/tests/functional/test_clientlib.py

@@ -10,7 +10,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import os
 import uuid
 
 from keystoneclient.auth.identity import v2 as v2_auth
@@ -20,6 +19,7 @@ from tempest_lib import base
 import testtools
 
 from neutronclient.common import exceptions
+from neutronclient.tests.functional import base as func_base
 from neutronclient.v2_0 import client as v2_client
 
 # This module tests client library functionalities with
@@ -38,26 +38,29 @@ class LibraryTestBase(base.BaseTestCase):
 class Libv2HTTPClientTestBase(LibraryTestBase):
 
     def _get_client(self):
-        return v2_client.Client(username=os.environ.get('OS_USERNAME'),
-                                password=os.environ.get('OS_PASSWORD'),
-                                tenant_name=os.environ.get('OS_TENANT_NAME'),
-                                auth_url=os.environ.get('OS_AUTH_URL'))
+        creds = func_base.credentials()
+        return v2_client.Client(username=creds['username'],
+                                password=creds['password'],
+                                tenant_name=creds['tenant_name'],
+                                auth_url=creds['auth_url'])
 
 
 class Libv2SessionClientTestBase(LibraryTestBase):
 
     def _get_client(self):
+        creds = func_base.credentials()
+
         session_params = {}
         ks_session = session.Session.construct(session_params)
         ks_discover = discover.Discover(session=ks_session,
-                                        auth_url=os.environ.get('OS_AUTH_URL'))
+                                        auth_url=creds['auth_url'])
         # At the moment, we use keystone v2 API
         v2_auth_url = ks_discover.url_for('2.0')
         ks_session.auth = v2_auth.Password(
             v2_auth_url,
-            username=os.environ.get('OS_USERNAME'),
-            password=os.environ.get('OS_PASSWORD'),
-            tenant_name=os.environ.get('OS_TENANT_NAME'))
+            username=creds['username'],
+            password=creds['password'],
+            tenant_name=creds['tenant_name'])
         return v2_client.Client(session=ks_session)