--- a/mercurial/patch.py
+++ b/mercurial/patch.py
@@ -412,6 +412,8 @@ def b85diff(fp, to, tn):
yield text[i:i+csize]
i += csize
+ if to == tn:
+ return
# TODO: deltas
l = len(tn)
fp.write('index %s..%s\nGIT binary patch\nliteral %s\n' %
@@ -593,8 +595,8 @@ def diff(repo, node1=None, node2=None, f
to = getfile(a).read(arev)
else:
header.append('new file mode %s\n' % mode)
- if util.binary(tn):
- dodiff = 'binary'
+ if util.binary(tn):
+ dodiff = 'binary'
elif f in removed:
if f in srcs:
dodiff = False