Have log_printer use utf8 stream.

Signed-off-by: Daniel Nephin <dnephin@gmail.com>

compose/cli/log_printer.py

@@ -5,7 +5,9 @@ import sys
 from itertools import cycle
 
 import six
+from six import next
 
+from compose import utils
 from . import colors
 from .multiplexer import Multiplexer
 from .utils import split_buffer
@@ -17,13 +19,11 @@ class LogPrinter(object):
         self.attach_params = attach_params or {}
         self.prefix_width = self._calculate_prefix_width(containers)
         self.generators = self._make_log_generators(monochrome)
-        self.output = output
+        self.output = utils.get_output_stream(output)
 
     def run(self):
         mux = Multiplexer(self.generators)
         for line in mux.loop():
-            if isinstance(line, six.text_type) and not six.PY3:
-                line = line.encode('utf-8')
             self.output.write(line)
 
     def _calculate_prefix_width(self, containers):

tests/unit/log_printer_test.py

@@ -32,7 +32,6 @@ class LogPrinterTest(unittest.TestCase):
         output = self.get_default_output()
         self.assertIn('\033[', output)
 
-    @unittest.skipIf(six.PY3, "Only test unicode in python2")
     def test_unicode(self):
         glyph = u'\u2022'
 
@@ -42,7 +41,10 @@ class LogPrinterTest(unittest.TestCase):
         container = MockContainer(reader)
         output = run_log_printer([container])
 
-        self.assertIn(glyph, output.decode('utf-8'))
+        if six.PY2:
+            output = output.decode('utf-8')
+
+        self.assertIn(glyph, output)
 
 
 def run_log_printer(containers, monochrome=False):