tests/crashgetbundler.py

setdiscovery: don't use dagutil for rev -> node conversions

We don't need to use dagutil to perform a simple rev -> node
conversion.

I haven't measured, but the new code is likely faster, as we
avoid extra function calls and avoid some attribute lookups.

Differential Revision: https://phab.mercurial-scm.org/D4304

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)