diff -r f21286e48bc6 -r 50269a4dce61 mercurial/util.py
--- a/mercurial/util.py	Thu Jun 23 18:18:33 2016 +0100
+++ b/mercurial/util.py	Thu Jun 23 18:20:58 2016 +0100
@@ -1483,6 +1483,7 @@
         self._checkambig = checkambig
 
         # delegated methods
+        self.read = self._fp.read
         self.write = self._fp.write
         self.seek = self._fp.seek
         self.tell = self._fp.tell