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annotate mercurial/rewriteutil.py @ 44353:daad3aace942

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nodemap: only use persistent nodemap for non-inlined revlog Revlog are inlined while they are small (to avoid having too many file to deal with). The persistent nodemap will only provides a significant boost for large enough revlog index. So it does not make sens to add an extra file to store nodemap for small revlog. We could consider inclining the nodemap data inside the revlog itself, but the benefit is unclear so let it be an adventure for another time. Differential Revision: https://phab.mercurial-scm.org/D7837
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Wed, 15 Jan 2020 15:47:40 +0100
parents 687b865b95ad
children a391d0710f22
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1 # rewriteutil.py - utility functions for rewriting changesets
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2 #
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3 # Copyright 2017 Octobus <contact@octobus.net>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from __future__ import absolute_import
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9
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10 from .i18n import _
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11
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12 from . import (
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13 error,
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14 node,
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15 obsolete,
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16 revset,
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17 )
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18
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19
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20 def precheck(repo, revs, action=b'rewrite'):
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21 """check if revs can be rewritten
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22 action is used to control the error message.
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23
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24 Make sure this function is called after taking the lock.
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25 """
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26 if node.nullrev in revs:
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27 msg = _(b"cannot %s null changeset") % action
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28 hint = _(b"no changeset checked out")
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29 raise error.Abort(msg, hint=hint)
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30
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31 if len(repo[None].parents()) > 1:
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32 raise error.Abort(_(b"cannot %s while merging") % action)
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33
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34 publicrevs = repo.revs(b'%ld and public()', revs)
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35 if publicrevs:
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36 msg = _(b"cannot %s public changesets") % action
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37 hint = _(b"see 'hg help phases' for details")
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38 raise error.Abort(msg, hint=hint)
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39
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40 newunstable = disallowednewunstable(repo, revs)
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41 if newunstable:
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42 raise error.Abort(_(b"cannot %s changeset with children") % action)
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44
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45 def disallowednewunstable(repo, revs):
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46 """Checks whether editing the revs will create new unstable changesets and
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47 are we allowed to create them.
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48
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49 To allow new unstable changesets, set the config:
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50 `experimental.evolution.allowunstable=True`
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51 """
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52 allowunstable = obsolete.isenabled(repo, obsolete.allowunstableopt)
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53 if allowunstable:
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54 return revset.baseset()
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55 return repo.revs(b"(%ld::) - %ld", revs, revs)