log: fix auto colorizing for custom streams

Check for existence of isatty() method in the stream object. Some custom
streams (e.g. in nose) do not necessarily have this.

Change-Id: I4c8386dfd6f016f926f2eb70b953b19095d585c2
Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/gbp/log.py b/gbp/log.py
index e269d653..17cd680d 100644
--- a/gbp/log.py
+++ b/gbp/log.py
@@ -77,7 +77,7 @@ class GbpStreamHandler(logging.StreamHandler):
         """Check if to print in color or not"""
         if self._color.is_on():
             return True
-        elif self._color.is_auto():
+        elif self._color.is_auto() and hasattr(self.stream, 'isatty'):
             in_emacs = (os.getenv("EMACS") and
                         os.getenv("INSIDE_EMACS", "").endswith(",comint"))
             return self.stream.isatty() and not in_emacs