Update tox.ini to support RHEL 6.x.

In order to support running unit tests on RHEL 6.x we need to patch
eventlet with contrib/redhat-eventlet.patch. We already
have support for this in the tools/install_venv_common.py but we need
to make a couple changes to allow tox to consume this:

1) Sync in the latest intall_venv_common.py from oslo. This changes
 patch to use the -N option (ignore already applied patches) and makes
 it safe to call the patching function more than once.

2) Add a new patch_tox_venv.py script in tools.

3) Update tox.ini to call patch_tox_venv.py before it runs tests and
coverage.

Change-Id: I3e2b07c3f718e4aede5c5f231ff0cdb7721ec885

2 files changed, 40 insertions, 1 deletions

diff --git a/tools/install_venv_common.py b/tools/install_venv_common.py
index 7ecf5010f..413065640 100644
--- a/tools/install_venv_common.py
+++ b/tools/install_venv_common.py
@@ -185,7 +185,8 @@ class Fedora(Distro):
         self.run_command(['sudo', 'yum', 'install', '-y', pkg], **kwargs)
 
     def apply_patch(self, originalfile, patchfile):
-        self.run_command(['patch', originalfile, patchfile])
+        self.run_command(['patch', '-N', originalfile, patchfile],
+                         check_exit_code=False)
 
     def install_virtualenv(self):
         if self.check_cmd('virtualenv'):
diff --git a/tools/patch_tox_venv.py b/tools/patch_tox_venv.py
new file mode 100644
index 000000000..399acbcfc
--- /dev/null
+++ b/tools/patch_tox_venv.py
@@ -0,0 +1,38 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright 2013 Red Hat, Inc.
+#
+#    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 os
+import sys
+
+import install_venv_common as install_venv
+
+
+def main(argv):
+    root = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
+
+    venv = os.environ['VIRTUAL_ENV']
+
+    pip_requires = os.path.join(root, 'tools', 'pip-requires')
+    test_requires = os.path.join(root, 'tools', 'test-requires')
+    py_version = "python%s.%s" % (sys.version_info[0], sys.version_info[1])
+    project = 'Nova'
+    install = install_venv.InstallVenv(root, venv, pip_requires, test_requires,
+                                       py_version, project)
+    #NOTE(dprince): For Tox we only run post_process (which patches files, etc)
+    install.post_process()
+
+if __name__ == '__main__':
+    main(sys.argv)