tests/crashgetbundler.py

debugbuilddag: use context manager for progress, locks, transaction

I minor side-effect is that .hg/localtags is now written before the
transaction commits.

Differential Revision: https://phab.mercurial-scm.org/D3777

from __future__ import absolute_import

from mercurial.i18n import _
from mercurial import (
        changegroup,
        error,
        extensions
    )

def abort(orig, *args, **kwargs):
    raise error.Abort(_('this is an exercise'))

def uisetup(ui):
    extensions.wrapfunction(changegroup, 'getbundler', abort)