revbranchcache: add the necessary bit to send 'rbc' data over bundle2
Getbundle is now capable of sending rev-branch-cache information for the
changesets it bundle. The data sent are mostly nodes so it is quite compact.
The goal of the rev-branch-cache is to speed up branch map computation,
especially when the branchmap gets invalidated so we send data for all
exchanged changesets. In addition, computing the relevant heads to send in
case of partial pulling would be challenging.
The feature is still inactive since the capability is not advertised yet.
# 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)