Workaround for 'File exists' test failure

Adds code to create the assets directory that django_pyscss
intends to create for scss.  This avoids throwing an exception
in concurrency scenarios

Change-Id: Ic55e2a7ce59ec9b7550a7412697cb8d6563d98a3
Closes-bug: #1367590

openstack_dashboard/django_pyscss_fix/__init__.py

@@ -0,0 +1,36 @@
+# 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.
+
+import logging
+import os
+
+from django.conf import settings
+
+scss_asset_root = os.path.join(settings.STATIC_ROOT, 'scss', 'assets')
+LOG = logging.getLogger(__name__)
+
+"""
+This is a workaround for https://bugs.launchpad.net/horizon/+bug/1367590
+It works by creating a path that django_scss will attempt to create
+later if it doesn't exist. The django_pyscss code fails
+intermittantly because of concurrency issues.  This code ignores the
+exception and if it was anything other than the concurrency issue
+django_pyscss will discover the problem later.
+
+TODO (doug-fish):  remove this workaround once fix for
+https://github.com/fusionbox/django-pyscss/issues/23 is picked up.
+"""
+try:
+    if not os.path.exists(scss_asset_root):
+        os.makedirs(scss_asset_root)
+except Exception as e:
+    LOG.info("Error precreating path %s, %s" % (scss_asset_root, e))

openstack_dashboard/settings.py

@@ -207,6 +207,7 @@ INSTALLED_APPS = [
     'django.contrib.staticfiles',
     'django.contrib.humanize',
     'django_pyscss',
+    'openstack_dashboard.django_pyscss_fix',
     'compressor',
     'horizon',
     'openstack_auth',

openstack_dashboard/test/settings.py

@@ -19,6 +19,7 @@ from openstack_dashboard import exceptions
 
 TEST_DIR = os.path.dirname(os.path.abspath(__file__))
 ROOT_PATH = os.path.abspath(os.path.join(TEST_DIR, ".."))
+STATIC_ROOT = os.path.abspath(os.path.join(ROOT_PATH, '..', 'static'))
 
 SECRET_KEY = secret_key.generate_or_read_from_file(
     os.path.join(TEST_DIR, '.secret_key_store'))