view mercurial/rewriteutil.py @ 42325:526750cdd02d

bookmarks: keep bookmarks in .hg/store if new config set

Bookmarks storage consists of two parts: (1) the set of bookmarks and
their positions, and (2) the current bookmark. The former can get
updated by exchange, while the latter cannot. However, they are both
stored in directly .hg/ and protected by repo.wlock(). As a result,
ugly workarounds were needed. This patch introduces a new config
option to store the set of bookmarks and their positions in .hg/store/
but still storing the current bookmark directory in .hg/. The config
option only takes effect at repo creation time. It results in a new
requirement being set.

Differential Revision: https://phab.mercurial-scm.org/D6387

# rewriteutil.py - utility functions for rewriting changesets
#
# Copyright 2017 Octobus <[e-mail]>
#
# 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)