be more accurate when checking if cosmos enabled (#555)

dcos/cosmospackage.py

@@ -37,10 +37,14 @@ class Cosmos():
         # authorized for the command specified, not this endpoint
         except DCOSAuthorizationException:
             return True
-        # all other errors are treated as endpoint not available
+        # allow exception through so we can show user actual http exception
+        # except 404, because then the url is fine, just not cosmos enabled
+        except DCOSHTTPException as e:
+            logger.exception(e)
+            return e.status() != 404
         except Exception as e:
             logger.exception(e)
-            return False
+            return True
 
         return response.status_code == 200
 

dcos/errors.py

@@ -14,6 +14,9 @@ class DCOSHTTPException(DCOSException):
     def __init__(self, response):
         self.response = response
 
+    def status(self):
+        return self.response.status_code
+
     def __str__(self):
         return 'Error while fetching [{0}]: HTTP {1}: {2}'.format(
             self.response.request.url,