tests/lockdelay.py

run-tests: replace '/dev/null' with os.devnull for Windows

Many of the *.py tests were dying on:

    File "c:\Users\Matt\projects\hg\hgdemandimport\tracing.py", line 27, in log
      _pipe = open(os.environ['HGCATAPULTSERVERPIPE'], 'w', 1)
  IOError: [Errno 2] $ENOENT$: '/dev/null'

# Dummy extension that adds a delay after acquiring a lock.
#
# This extension can be used to test race conditions between lock acquisition.

from __future__ import absolute_import

import os
import time

def reposetup(ui, repo):

    class delayedlockrepo(repo.__class__):
        def lock(self):
            delay = float(os.environ.get('HGPRELOCKDELAY', '0.0'))
            if delay:
                time.sleep(delay)
            res = super(delayedlockrepo, self).lock()
            delay = float(os.environ.get('HGPOSTLOCKDELAY', '0.0'))
            if delay:
                time.sleep(delay)
            return res
    repo.__class__ = delayedlockrepo