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localrepo: define "features" on repository instances (API)...
localrepo: define "features" on repository instances (API) There are a handful of attributes/methods on repository instances that describe the behavior of the repository. Furthermore, there is an unbound set of repository descriptors that we may wish to expose. For example, an extension may wish to add a descriptor and have monkeypatched functions look for the presence of an attribute before taking actions. This commit introduces a "features" mechanism to allow repositories to self-advertise an arbitrary set of strings that describe repository behavior or capabilities. We implement basic support for advertising a few features to give an idea of what I want to use this for. Differential Revision: https://phab.mercurial-scm.org/D4709

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rewriteutil.py
53 lines | 1.6 KiB | text/x-python | PythonLexer
# rewriteutil.py - utility functions for rewriting changesets
#
# Copyright 2017 Octobus <contact@octobus.net>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from __future__ import absolute_import
from .i18n import _
from . import (
error,
node,
obsolete,
revset,
)
def precheck(repo, revs, action='rewrite'):
"""check if revs can be rewritten
action is used to control the error message.
Make sure this function is called after taking the lock.
"""
if node.nullrev in revs:
msg = _("cannot %s null changeset") % (action)
hint = _("no changeset checked out")
raise error.Abort(msg, hint=hint)
publicrevs = repo.revs('%ld and public()', revs)
if len(repo[None].parents()) > 1:
raise error.Abort(_("cannot %s while merging") % action)
if publicrevs:
msg = _("cannot %s public changesets") % (action)
hint = _("see 'hg help phases' for details")
raise error.Abort(msg, hint=hint)
newunstable = disallowednewunstable(repo, revs)
if newunstable:
raise error.Abort(_("cannot %s changeset with children") % action)
def disallowednewunstable(repo, revs):
"""Checks whether editing the revs will create new unstable changesets and
are we allowed to create them.
To allow new unstable changesets, set the config:
`experimental.evolution.allowunstable=True`
"""
allowunstable = obsolete.isenabled(repo, obsolete.allowunstableopt)
if allowunstable:
return revset.baseset()
return repo.revs("(%ld::) - %ld", revs, revs)