Mercurial > hg
view mercurial/rewriteutil.py @ 42136:10a6725dca6e
compression: introduce an official `zstd-revlog` requirement
This requirement supersedes `exp-compression-zstd`. However, we keep support for
the old requirement.
Strictly speaking, we do not need to add a new requirement, there are no logic
change making "new" repo incompatible with mercurial client using a version
that support `exp-compression-zstd`.
The choice to introduce a new requirement is motivated by the following:
* The previous requirement was explicitly "experimental". Using it by default
could confuse users.
* adding support for a hypothetical third compression engine will requires new
code, and will comes with its own requirement tool.
* We won't use it as the default for a while since I do not think we support
zstd on all platform. I can imagine we'll gain another (unrelated but on my
default) requirement by the time we turn this zstd by default.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Wed, 27 Mar 2019 18:27:03 +0100 |
parents | 8c6329fa6038 |
children | 57875cf423c9 |
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# 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) if len(repo[None].parents()) > 1: raise error.Abort(_("cannot %s while merging") % action) publicrevs = repo.revs('%ld and public()', revs) 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)