# HG changeset patch
# User Mike Hommey <mh@glandium.org>
# Date 2017-08-11 03:47:19
# Node ID 1814ca418b3043c4c724dbd39a6c94825adbe549
# Parent  a3ce07e2dde5737644dd719806b1e52fb1cc1004

branchmap: revert c34532365b38 for Python 2.7 compatibility

Old versions of python 2.7 don't like that the second argument to
struct.unpack_from is a bytearray, so the change removing the util.buffer
around that argument in branchmap broke running on older versions of python
2.7.

Differential Revision: https://phab.mercurial-scm.org/D330

diff --git a/mercurial/branchmap.py b/mercurial/branchmap.py
--- a/mercurial/branchmap.py
+++ b/mercurial/branchmap.py
@@ -406,7 +406,8 @@ class revbranchcache(object):
 
         # fast path: extract data from cache, use it if node is matching
         reponode = changelog.node(rev)[:_rbcnodelen]
-        cachenode, branchidx = unpack_from(_rbcrecfmt, self._rbcrevs, rbcrevidx)
+        cachenode, branchidx = unpack_from(
+            _rbcrecfmt, util.buffer(self._rbcrevs), rbcrevidx)
         close = bool(branchidx & _rbccloseflag)
         if close:
             branchidx &= _rbcbranchidxmask