tests/crashgetbundler.py

branchmap: make branchcache responsible for reading

Encapsulate reading in a classmethod, to make it clear what kind of object is
being handled.

This is part of a stack of refactoring changes to help performance improvements
down the line.

Differential Revision: https://phab.mercurial-scm.org/D5635

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)