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 (and soon in glanceclient and
neutronclient).

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

Change-Id: I2ec1df481aba7a3866fc8dbc912311de02c22d11
Related-Bug: #1455102

cinderclient/tests/functional/base.py

@@ -12,10 +12,45 @@
 
 import os
 
+from six.moves import configparser
 from tempest_lib.cli import base
 from tempest_lib.cli import output_parser
 
 
+_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,
+        'uri': auth_url
+    }
+
+
 class ClientTestBase(base.ClientTestBase):
     """Cinder base class, issues calls to cinderclient.
 
@@ -30,12 +65,7 @@ class ClientTestBase(base.ClientTestBase):
             'OS_CINDERCLIENT_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(cli_dir=cli_dir, **credentials())
 
     def cinder(self, *args, **kwargs):
         return self.clients.cinder(*args,

cinderclient/tests/functional/hooks/post_test_hook.sh

@@ -31,15 +31,28 @@ function generate_testr_results {
 
 export CINDERCLIENT_DIR="$BASE/python-cinderclient"
 
+sudo chown -R jenkins:stack $CINDERCLIENT_DIR
+
 # Get admin credentials
 cd $STACK_DIR
 source openrc admin admin
 
+# Store these credentials into the config file
+CREDS_FILE=$CINDERCLIENT_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 cinderclient dir
 cd $CINDERCLIENT_DIR
 
-sudo chown -R jenkins:stack $CINDERCLIENT_DIR
-
 # Run tests
 echo "Running cinderclient functional test suite"
 set +e

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