Print diagnosis message when a task is Ctrl-C'ed out

R=dpranke@chromium.org
BUG=
TEST=


Review URL: http://codereview.chromium.org/7891058

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@101133 0039d316-1c4b-4281-b951-d872f2087c98

gclient_utils.py

@@ -343,6 +343,7 @@ def CheckCallAndFilter(args, stdout=None, filter_fn=None,
   # This has to be done on a per byte basis to make sure it is not buffered:
   # normally buffering is done for each line, but if svn requests input, no
   # end-of-line character is output after the prompt and it would not show up.
+  try:
     in_byte = kid.stdout.read(1)
     if in_byte:
       if call_filter_on_first_line:
@@ -363,6 +364,10 @@ def CheckCallAndFilter(args, stdout=None, filter_fn=None,
       if len(in_line):
         filter_fn(in_line)
     rv = kid.wait()
+  except KeyboardInterrupt:
+    print >> sys.stderr, 'Failed while running "%s"' % ' '.join(args)
+    raise
+
   if rv:
     raise subprocess2.CalledProcessError(
         rv, args, kwargs.get('cwd', None), None, None)