--- a/mercurial/branchmap.py Fri Jan 09 22:14:01 2015 -0500
+++ b/mercurial/branchmap.py Sat Jan 10 12:00:03 2015 -0500
@@ -407,6 +407,9 @@
try:
if self._rbcnamescount != 0:
f = repo.vfs.open(_rbcnames, 'ab')
+ # The position after open(x, 'a') is implementation defined-
+ # see issue3543. SEEK_END was added in 2.5
+ f.seek(0, 2) #os.SEEK_END
if f.tell() == self._rbcsnameslen:
f.write('\0')
else:
@@ -431,6 +434,9 @@
len(self._rbcrevs) // _rbcrecsize)
try:
f = repo.vfs.open(_rbcrevs, 'ab')
+ # The position after open(x, 'a') is implementation defined-
+ # see issue3543. SEEK_END was added in 2.5
+ f.seek(0, 2) #os.SEEK_END
if f.tell() != start:
f.seek(start)
f.truncate()