--- a/app/soc/logic/system.py	Wed Mar 11 21:28:48 2009 +0000
+++ b/app/soc/logic/system.py	Wed Mar 11 21:29:32 2009 +0000
@@ -26,16 +26,35 @@
 import settings
 
 
-def isDebug():
-  """Returns True if Melange application is running in "debug mode".
-  
-  "Debug mode" is currently determined from settings.DEBUG but may become
-  more sophisticated in the future.
-  """
-  return settings.DEBUG
-
 def getAppVersion():
   """Returns the Google App Engine "version" of the running instance.
   """
 
   return os.environ.get('CURRENT_VERSION_ID')
+
+
+def getMelangeVersion():
+  """Returns the Melange part of the GAE version.
+  """
+
+  return getAppVersion().split('.', 1)[0]
+
+
+def isLocal():
+  """Returns True if Melange application is running locally.
+  
+  "Local mode" is currently determined from settings.DEBUG but may become
+  more sophisticated in the future.
+  """
+
+  return settings.DEBUG
+
+
+def isDebug():
+  """Returns True if Melange application is running in "debug mode".
+
+  "Debug mode" is currently enabled if running locally or if the
+  current Melange version is 'devvin'.
+  """
+
+  return isLocal() or getMelangeVersion() == 'devvin'

--- a/app/soc/templates/soc/base.html	Wed Mar 11 21:28:48 2009 +0000
+++ b/app/soc/templates/soc/base.html	Wed Mar 11 21:29:32 2009 +0000
@@ -110,6 +110,9 @@
 	Developer |
 	{% endif %}
 	{% if is_debug %}
+	Debug Mode |
+	{% endif %}
+	{% if is_local %}
 	<form id="flush_form" action="/_ah/admin/memcache" method="post" style="display: inline;">
       <input type="submit" class="button" name="action:flush" value="Flush Cache"/>
     </form> | 

--- a/app/soc/views/helper/responses.py	Wed Mar 11 21:28:48 2009 +0000
+++ b/app/soc/views/helper/responses.py	Wed Mar 11 21:29:32 2009 +0000
@@ -122,15 +122,15 @@
   context['user'] = user
   context['is_admin'] = is_admin
 
+  context['is_local'] = system.isLocal()
   context['is_debug'] = system.isDebug()
   context['sign_in'] = users.create_login_url(request.path)
   context['sign_out'] = users.create_logout_url(request.path)
 
   context['sidebar_menu_items'] = sidebar.getSidebar(account, user)
 
-  gae_version = system.getAppVersion()
-  context['gae_version'] = gae_version
-  context['soc_release'] = gae_version.split('.', 1)[0]
+  context['gae_version'] = system.getAppVersion()
+  context['soc_release'] = system.getMelangeVersion()
 
   settings = site.logic.getSingleton()