tests/lockdelay.py

auto-upgrade: add a test case where the repository is already locked

This show the current behavior when the repository to auto-upgrade is already
locked.

The current behavior is to abort, which is probably not great. Now that we have
a proper test, we can think about the behavior we wants in a later tests.

Differential Revision: https://phab.mercurial-scm.org/D12618

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


import os
import time


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

    repo.__class__ = delayedlockrepo