Make warning messages more user friendly.

Printing the file and line number of the warning's origin
makes the warning itself harder to spot, and can make it
appear as if something has actually gone wrong.

Change-Id: Ie77357d9a061d31e234e6e434521d2d274409773

1 files changed, 7 insertions, 0 deletions

diff --git a/morphlib/app.py b/morphlib/app.py
index c8fe397d..654451f4 100644
--- a/morphlib/app.py
+++ b/morphlib/app.py
@@ -20,6 +20,7 @@ import pipes
 import sys
 import time
 import urlparse
+import warnings
 import extensions
 
 import morphlib
@@ -213,6 +214,12 @@ class Morph(cliapp.Application):
         with morphlib.util.hide_password_environment_variables(os.environ):
             cliapp.Application.log_config(self)
 
+        def pretty_warnings(message, category, filename, lineno,
+                            file=None, line=None):
+            return 'WARNING: %s' % (message)
+
+        warnings.formatwarning = pretty_warnings
+
     def process_args(self, args):
         self.check_time()