tests/revnamesext.py

phabricator: introduce a `phabricator.retry` option

For the past 2 days, my connection to phab.mercurial-scm.org became extremely
poor. In practice this mean that any conduit call has a fairly high change to
hang and die. Giving the amount of call done by the phabricator extension, it
means the when I am lucky I can get 1 or 2 Diff to update after a few try, but
anything sizeable doesn't have any hope to get through.

This changesets introduce a new option for the fabricator extension to try retry
failed command itself. So that I can get Diff through.

As you can guess, this changeset managed to reach Phabricator thanks to itself.

Differential Revision: https://phab.mercurial-scm.org/D9449

# Dummy extension to define a namespace containing revision names

from __future__ import absolute_import

from mercurial import namespaces


def reposetup(ui, repo):
    names = {b'r%d' % rev: repo[rev].node() for rev in repo}
    namemap = lambda r, name: names.get(name)
    nodemap = lambda r, node: [b'r%d' % repo[node].rev()]

    ns = namespaces.namespace(
        b'revnames',
        templatename=b'revname',
        logname=b'revname',
        listnames=lambda r: names.keys(),
        namemap=namemap,
        nodemap=nodemap,
    )
    repo.names.addnamespace(ns)