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annotate hgext/hooklib/reject_merge_commits.py @ 48578:28f0092ec89f

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exchange: add fast path for subrepo check on push Try to check if .hgsub and .hgsubstate exist at all before looking for them in every changeset to be pushed. The latter can be quite expensive for large repositories and the existance check is almost free. Differential Revision: https://phab.mercurial-scm.org/D11956
author Joerg Sonnenberger <joerg@bec.de>
date Mon, 03 Jan 2022 01:09:56 +0100
parents 4cabeea6d214
children 6000f5b25c9b
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1 # Copyright 2020 Joerg Sonnenberger <joerg@bec.de>
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2 #
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3 # This software may be used and distributed according to the terms of the
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4 # GNU General Public License version 2 or any later version.
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5
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6 """reject_merge_commits is a hook to check new changesets for merge commits.
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7 Merge commits are allowed only between different branches, i.e. merging
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8 a feature branch into the main development branch. This can be used to
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9 enforce policies for linear commit histories.
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10
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11 Usage:
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12 [hooks]
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13 pretxnchangegroup.reject_merge_commits = \
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14 python:hgext.hooklib.reject_merge_commits.hook
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15 """
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16
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17 from __future__ import absolute_import
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18
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19 from mercurial.i18n import _
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20 from mercurial import (
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21 error,
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22 pycompat,
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23 )
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24
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25
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26 def hook(ui, repo, hooktype, node=None, **kwargs):
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27 if hooktype != b"pretxnchangegroup":
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28 raise error.Abort(
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29 _(b'Unsupported hook type %r') % pycompat.bytestr(hooktype)
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30 )
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31
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32 ctx = repo.unfiltered()[node]
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33 for rev in repo.changelog.revs(start=ctx.rev()):
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34 rev = repo[rev]
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35 parents = rev.parents()
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36 if len(parents) < 2:
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37 continue
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38 if all(repo[p].branch() == rev.branch() for p in parents):
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39 raise error.Abort(
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40 _(
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41 b'%s rejected as merge on the same branch. '
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42 b'Please consider rebase.'
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43 )
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44 % rev
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45 )