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revert: remove dangerous `parents` argument from `cmdutil.revert()`...
revert: remove dangerous `parents` argument from `cmdutil.revert()` As we found out the hard way (thanks to spectral@ for figuring it out!), `cmdutil.revert()`'s `parents` argument must be `repo.dirstate.parents()` or things may go wrong. We had an extension that passed in the target commit as the first parent. The `hg split` command from the evolve extension seems to have made the same mistake, but I haven't looked carefully. The problem is that `cmdutil._performrevert()` calls `dirstate.normal()` on reverted files if the commit to revert to equals the first parent. So if you pass in `ctx=foo` and `parents=(foo.node(), nullid)`, then `dirstate.normal()` will be called for the revert files, even though they might not be clean in the working copy. There doesn't seem to be any reason, other than a tiny performance benefit, to passing the `parents` around instead of looking them up again in `cmdutil._performrevert()`, so that's what this patch does. Differential Revision: https://phab.mercurial-scm.org/D8925

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rewriteutil.py
72 lines | 2.1 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=b'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 = _(b"cannot %s null changeset") % action
hint = _(b"no changeset checked out")
raise error.Abort(msg, hint=hint)
if len(repo[None].parents()) > 1:
raise error.Abort(_(b"cannot %s while merging") % action)
publicrevs = repo.revs(b'%ld and public()', revs)
if publicrevs:
msg = _(b"cannot %s public changesets") % action
hint = _(b"see 'hg help phases' for details")
raise error.Abort(msg, hint=hint)
newunstable = disallowednewunstable(repo, revs)
if newunstable:
raise error.Abort(_(b"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(b"(%ld::) - %ld", revs, revs)
def skip_empty_successor(ui, command):
empty_successor = ui.config(b'rewrite', b'empty-successor')
if empty_successor == b'skip':
return True
elif empty_successor == b'keep':
return False
else:
raise error.ConfigError(
_(
b"%s doesn't know how to handle config "
b"rewrite.empty-successor=%s (only 'skip' and 'keep' are "
b"supported)"
)
% (command, empty_successor)
)