Get properly env vars or their default values

It defines env.get() as an unique way to get Functest env vars or
their default values. It can be considered as a wrapper above os.environ.

It enforces backward compatibility via CONST which mustn't be used
for that purpose. It should be noted that it also stops using CONST
for getting OpenStack env vars.

Change-Id: I333dc1afbc0123166a7eaff8b551370098efa341
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/functest/opnfv_tests/openstack/tempest/tempest.py b/functest/opnfv_tests/openstack/tempest/tempest.py
index 56705fc0f..c19c8d9d2 100644
--- a/functest/opnfv_tests/openstack/tempest/tempest.py
+++ b/functest/opnfv_tests/openstack/tempest/tempest.py
@@ -26,6 +26,7 @@ from functest.core import testcase
 from functest.opnfv_tests.openstack.snaps import snaps_utils
 from functest.opnfv_tests.openstack.tempest import conf_utils
 from functest.utils.constants import CONST
+from functest.utils import env
 import functest.utils.functest_utils as ft_utils
 
 from snaps.config.flavor import FlavorConfig
@@ -128,8 +129,8 @@ class TempestCommon(testcase.TestCase):
         result_file = open(conf_utils.TEMPEST_LIST, 'w')
         black_tests = []
         try:
-            installer_type = CONST.__getattribute__('INSTALLER_TYPE')
-            deploy_scenario = CONST.__getattribute__('DEPLOY_SCENARIO')
+            installer_type = env.get('INSTALLER_TYPE')
+            deploy_scenario = env.get('DEPLOY_SCENARIO')
             if bool(installer_type) * bool(deploy_scenario):
                 # if INSTALLER_TYPE and DEPLOY_SCENARIO are set we read the
                 # file
@@ -405,7 +406,7 @@ class TempestResourcesManager(object):
 
     def _create_flavor(self, name):
         """Create flavor for tests."""
-        scenario = CONST.__getattribute__('DEPLOY_SCENARIO')
+        scenario = env.get('DEPLOY_SCENARIO')
         flavor_metadata = None
         if 'ovs' in scenario or 'fdio' in scenario:
             flavor_metadata = create_flavor.MEM_PAGE_SIZE_LARGE
@@ -463,7 +464,7 @@ class TempestResourcesManager(object):
 
         if use_custom_flavors:
             LOGGER.info("Creating 2nd flavor for Tempest suite")
-            scenario = CONST.__getattribute__('DEPLOY_SCENARIO')
+            scenario = env.get('DEPLOY_SCENARIO')
             if 'ovs' in scenario or 'fdio' in scenario:
                 CONST.__setattr__('openstack_flavor_ram', 1024)
             name = CONST.__getattribute__(