Disable output buffering in devtools scripts.

mojo/devtools/common/devtoolslib/utils.py

Index: mojo/devtools/common/devtoolslib/utils.py
diff --git a/mojo/devtools/common/devtoolslib/utils.py b/mojo/devtools/common/devtoolslib/utils.py
index 7bf2e1c641221f2d89e25022c7301a10b5d8a4b8..085d2253cd3829ee4f8e22ad63b4645d1f9eb651 100644
--- a/mojo/devtools/common/devtoolslib/utils.py
+++ b/mojo/devtools/common/devtoolslib/utils.py
@@ -4,6 +4,9 @@
 
 """Python utils."""
 
+import os
+import sys
+
 
 def overrides(parent_class):
   """Inherits the docstring from the method of the same name in the indicated
@@ -14,3 +17,11 @@ def overrides(parent_class):
     method.__doc__ = getattr(parent_class, method.__name__).__doc__
     return method
   return overriding
+
+
+def disable_output_buffering():
+  """Disables the buffering of the stdout. Devtools command line scripts should
+  do so, so that their stdout is consistent when not directly attached to a
+  terminal (e.g. because another script runs devtools in a subprocess).
+  """
+  sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)

[qsr, 2016/05/10 16:15:21]

How portable is this? Does this work on every platform we care about?

[ppi, 2016/05/10 16:17:08]

Good question - I will check that it works on Mac before landing (tomorrow,
don't have one at hand).

[ppi, 2016/05/11 11:21:29]

Mac seems to be happy w/ this.