Allow loading of product/vendor/package info from external file

Currently the version.py file hardcodes some basic info for
the NOVA_PRODUCT, NOVA_VENDOR and NOVA_PACKAGE constants. It
is desirable that OS distro vendors can override/extend this
data in packages they ship. Cloud providers may also desire
to do the same. This allows Nova to optionally load this
data from a /etc/nova/release file. That file should contain
the data in a trivial "ini" format. For example:

  [Nova]
  vendor = Fedora Project
  package = 1.fc18

Note that vendor sare not required to override all strings.
In this example, the 'product' field is not set, leaving
it on the default 'OpenStack Nova' value.

Change-Id: I3d8d32eaf35268c4b0908b0a93b7c9a2ea9c580a
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/nova/tests/test_versions.py b/nova/tests/test_versions.py
index 68e77ff9e..e864c00dd 100644
--- a/nova/tests/test_versions.py
+++ b/nova/tests/test_versions.py
@@ -14,7 +14,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import __builtin__
+import os
+import StringIO
 
+from nova.openstack.common import cfg
 from nova import test
 from nova import version
 
@@ -53,3 +57,30 @@ class VersionTestCase(test.TestCase):
         """Ensure uninstalled code get version string"""
         self.assertEqual("2012.10-g9ec3421",
                         self.version.version_string_with_package())
+
+    def test_release_file(self):
+        version.loaded = False
+        real_open = __builtin__.open
+        real_find_file = cfg.CONF.find_file
+
+        def fake_find_file(self, name):
+            if name == "release":
+                return "/etc/nova/release"
+            return real_find_file(self, name)
+
+        def fake_open(path, *args, **kwargs):
+            if path == "/etc/nova/release":
+                data = """[Nova]
+vendor = ACME Corporation
+product = ACME Nova
+package = 1337"""
+                return StringIO.StringIO(data)
+
+            return real_open(path, *args, **kwargs)
+
+        self.stubs.Set(__builtin__, 'open', fake_open)
+        self.stubs.Set(cfg.ConfigOpts, 'find_file', fake_find_file)
+
+        self.assertEqual(version.vendor_string(), "ACME Corporation")
+        self.assertEqual(version.product_string(), "ACME Nova")
+        self.assertEqual(version.package_string(), "1337")