Add new versions class interface.

packages/base/all/vendor-config-onl/src/python/onl/versions/__init__.py

@@ -0,0 +1,37 @@
+import json
+
+class OnlVersionManifest(object):
+    def __init__(self, manifest):
+        self.version = json.load(open(manifest))
+
+        if 'version' in self.version:
+            self.version = self.version['version']
+
+    def __getattr__(self, name):
+        if name in self.version:
+            return self.version[name]
+        else:
+            raise AttributeError("version key '%s' does not exist." % name)
+
+class OnlVersionBase(OnlVersionManifest):
+    def __init__(self):
+        OnlVersionManifest.__init__(self, self.MANIFEST)
+
+class OnlRootfsVersion(OnlVersionBase):
+    MANIFEST='/etc/onl/rootfs/manifest.json'
+
+class OnlLoaderVersion(OnlVersionBase):
+    MANIFEST='/etc/onl/loader/manifest.json'
+
+#
+# Expected usage:
+#
+# import onl.versions
+#
+# print onl.versions.rootfs.BUILD_TIMESTAMP
+#
+
+rootfs = OnlRootfsVersion()
+loader = OnlLoaderVersion()
+
+