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annotate mercurial/rewriteutil.py @ 44440:4cabeea6d214

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hgext: start building a library for simple hooks Many workflows depend on hooks to enforce certain policies, e.g. to prevent forced pushes. The Mercurial Guide includes some cases and Google can help finding others, but it can save users a lot of time if hg itself has a couple of examples for further customization. Differential Revision: https://phab.mercurial-scm.org/D6825
author Joerg Sonnenberger <joerg@bec.de>
date Sat, 07 Sep 2019 14:50:39 +0200
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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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)