tests/test-revert-flags.t

convert: change socket mode from b'r+' to 'rwb' in cvs.py (issue6789)

'r+' mode used to open sockets for read/write operations, but '+' is not
supported in Python 3. We're using bytes with these sockets everywhere, so the
mode should have 'b'.  But the mode argument has to be str, not bytes.

#require execbit

  $ hg init repo
  $ cd repo
  $ echo foo > foo
  $ chmod 644 foo
  $ hg ci -qAm '644'

  $ chmod 755 foo
  $ hg ci -qAm '755'

reverting to rev 0

  $ hg revert -a -r 0
  reverting foo
  $ hg st
  M foo
  $ hg diff --git
  diff --git a/foo b/foo
  old mode 100755
  new mode 100644

  $ cd ..