Enhance the dummy configuration maker to be a little more workable

tools/generate-dummy-nova-conf.py

@@ -5,6 +5,8 @@
 
 import os
 import sys
+import tempfile
+import atexit
 
 possible_topdir = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
                                    os.pardir,
@@ -15,17 +17,51 @@ if os.path.exists(os.path.join(possible_topdir,
                                '__init__.py')):
     sys.path.insert(0, possible_topdir)
 
-from  anvil.components.helpers.nova import ConfConfigurator
-from  anvil.trace import TraceWriter
+from anvil.components.helpers.nova import ConfConfigurator
+from anvil.trace import TraceWriter
+
+from anvil import utils
+from anvil import shell as sh
+
+DUMMY_FILE = tempfile.mktemp()
+
+
+def at_exit_cleaner():
+    sh.unlink(DUMMY_FILE)
+
+atexit.register(at_exit_cleaner)
+
+
+def make_fakey(all_opts, last='dummy'):
+    src = {}
+    tmp = src
+    last_opt = all_opts[-1]
+    for opt in all_opts[0:-1]:
+        tmp[opt] = {}
+        tmp = tmp[opt]
+    tmp[last_opt] = last
+    return src
+
 
 class DummyInstaller(object):
     def get_option(self, option, *options, **kwargs):
         if option == 'db':
-            return {'host': 'localhost',
+            src = {
+                option: {
+                    'host': 'localhost',
                     'port': 3306,
                     'type': 'mysql',
-                    'user': 'root'}
-        return "dummy"
+                    'user': 'root'
+                },
+            }
+        elif option == 'ip':
+            return utils.get_host_ip()
+        elif utils.has_any(option, 'extra_flags', 'extra_opts', 'instances_path'):
+            return ''
+        else:
+            # Make a fake dictionary hierachy
+            src = make_fakey([option] + list(options))
+        return utils.get_deep(src, [option] + list(options))
 
     def get_bool_option(self, option, *options, **kwargs):
         return False
@@ -37,7 +73,9 @@ class DummyInstaller(object):
         return None
 
     def __init__(self):
-        self.tracewriter = TraceWriter("dummy-config-trace")
+        self.tracewriter = TraceWriter(DUMMY_FILE)
+
+
 
 d = DummyInstaller()
 c = ConfConfigurator(d)