--- a/mercurial/bundle2.py Fri Sep 15 18:57:50 2017 +0200
+++ b/mercurial/bundle2.py Fri Sep 15 18:37:29 2017 -0400
@@ -1050,7 +1050,11 @@
header.append(key)
header.append(value)
## finalize header
- headerchunk = ''.join(header)
+ try:
+ headerchunk = ''.join(header)
+ except TypeError:
+ raise TypeError(r'Found a non-bytes trying to '
+ r'build bundle part header: %r' % header)
outdebug(ui, 'header chunk size: %i' % len(headerchunk))
yield _pack(_fpartheadersize, len(headerchunk))
yield headerchunk