py3: switch blackbox to use pycompat.encodeutf8

Summary:
ui.log apparently receives non-utf8 data occasionally, which makes the
encoding fail. Let's change this to not encode on python2 (by using pycompat).
As we migrate to python 3 all the strings should become unicode, and this will once
again enforce utf8 encoding

Reviewed By: xavierd

Differential Revision: D19819700

fbshipit-source-id: 66da26d00d1b1c4286e325f0574ad7ff478e5d1f

eden/scm/edenscm/hgext/blackbox.py

@@ -49,7 +49,7 @@ import weakref
 from edenscm.mercurial import extensions, registrar, ui as uimod, util
 from edenscm.mercurial.i18n import _
 from edenscm.mercurial.node import hex
-from edenscm.mercurial.pycompat import range
+from edenscm.mercurial.pycompat import encodeutf8, range
 
 
 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
@@ -206,7 +206,7 @@ def wrapui(ui):
                     line = fmt % args
                     if not line.endswith("\n"):
                         line += "\n"
-                    fp.write(line.encode("utf-8"))
+                    fp.write(encodeutf8(line))
             except (IOError, OSError) as err:
                 self.debug("warning: cannot write to blackbox.log: %s\n" % err.strerror)
                 # do not restore _bbinlog intentionally to avoid failed