adding cache compatibility for zc.buildout

notes.md

@@ -40,3 +40,18 @@ can cause eggs to be installed incorrectly (due to a misdetected root path)
 ## Tests TODO
 
 * test to allow user paths in uranium script.
+
+## Buildout compatiblity
+
+We have to work with the buildout dictionary being an option set for a download cache:
+
+Some plugins use it: https://github.com/gawel/gp.recipe.node/blob/master/gp/recipe/node/__init__.py#L75
+
+Download object: https://github.com/buildout/buildout/blob/master/src/zc/buildout/download.py#L51
+
+to do so, we need:
+
+  * 'download-cache' option
+  * 'directory' option
+  * 'offline' option
+  * 'install-from-cache'

uranium/buildout_adapter.py

@@ -75,5 +75,8 @@ def _buildout(self):
         """ return a buildout """
         return {
             'directory': self._uranium.root,
+            'download-cache': '.cache',
+            'install-from-cache': 'false',
+            'offline': 'false',
             'parts-directory': self._uranium.parts_directory
         }

uranium/tests/test_buildout_adapter/test_buildout_object.py

@@ -34,3 +34,28 @@ def test_buildout_parts_directory(self):
         """
         eq_(self.buildout['buildout']['parts-directory'],
             os.path.join(self.temp_dir, 'parts'))
+
+    def test_download_cache(self):
+        """
+        buildout provides a download cache.
+        we should use that.
+        """
+        eq_(self.buildout['buildout']['download-cache'], '.cache')
+
+    def test_offline(self):
+        """
+        uranium does not currently support an offline proprty,
+        so always return false.
+        """
+        # configparser only supports strings.
+        # uranium should support real values
+        eq_(self.buildout['buildout']['offline'], 'false')
+
+    def test_install_from_cache(self):
+        """
+        uranium does not currently support an offline proprty,
+        so always return false.
+        """
+        # configparser only supports strings.
+        # uranium should support real values
+        eq_(self.buildout['buildout']['install-from-cache'], 'false')