D2561: util: work around Python 3 returning None at EOF instead of ''

[durin42 (Augie Fackler)]

durin42 created this revision.
Herald added a subscriber: mercurial-devel.
Herald added a reviewer: hg-reviewers.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D2561

AFFECTED FILES
  mercurial/util.py

CHANGE DETAILS

diff --git a/mercurial/util.py b/mercurial/util.py
--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -729,6 +729,9 @@
     def read(self, res, size=-1):
         if not self.reads:
             return
+        # Python 3 can return None from reads at EOF instead of empty strings.
+        if res is None:
+            res = ''
 
         self.fh.write('%s> read(%d) -> %d' % (self.name, size, len(res)))
         self._writedata(res)



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