Issue 5567 - Disable mercurial-setup permanently

mach

 #!/bin/sh
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 # The beginning of this script is both valid shell and valid python,
 # such that the script starts with the shell and is reexecuted with
 # the right python.
 '''which' python2.7 > /dev/null && exec python2.7 "$0" "$@" || exec python "$0" "$@"
 '''
 
 from __future__ import print_function, unicode_literals
 
 import os
 import sys
 
+# Disable mercurial-setup permanently. See https://issues.adblockplus.org/ticket/5567
+os.environ['I_PREFER_A_SUBOPTIMAL_MERCURIAL_EXPERIENCE'] = '1'
+
 def ancestors(path):
     while path:
         yield path
         (path, child) = os.path.split(path)
         if child == "":
             break
 
 def load_mach(dir_path, mach_path):
     import imp
     with open(mach_path, 'r') as fh:
@@ skipping 112 matching lines @@
             # Remove the first line (for 'def fork_interpose():') and the three
             # levels of indentation (12 spaces).
             fork_string = ''.join(x[12:] for x in fork_code[1:])
             cmdline = orig_command_line()
             cmdline[2] = fork_string
             return cmdline
         orig_command_line = forking.get_command_line
         forking.get_command_line = my_get_command_line
 
     main(sys.argv[1:])