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
# Copyright 2020 Joerg Sonnenberger <joerg@bec.de>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
"""reject_new_heads is a hook to check that branches touched by new changesets
have at most one open head. It can be used to enforce policies for
merge-before-push or rebase-before-push. It does not handle pre-existing
hydras.
Usage:
[hooks]
pretxnclose.reject_new_heads = \
python:hgext.hooklib.reject_new_heads.hook
"""
from __future__ import absolute_import
from mercurial.i18n import _
from mercurial import (
error,
pycompat,
)
def hook(ui, repo, hooktype, node=None, **kwargs):
if hooktype != b"pretxnclose":
raise error.Abort(
_(b'Unsupported hook type %r') % pycompat.bytestr(hooktype)
)
ctx = repo.unfiltered()[node]
branches = set()
for rev in repo.changelog.revs(start=ctx.rev()):
rev = repo[rev]
branches.add(rev.branch())
for branch in branches:
if len(repo.revs("head() and not closed() and branch(%s)", branch)) > 1:
raise error.Abort(
_(b'Changes on branch %r resulted in multiple heads')
% pycompat.bytestr(branch)
)