upstream/mercurial-mirror Files · tests/testlib/crash_transaction_late.py

persistent-nodemap: introduce a test to highlight possible race...

persistent-nodemap: introduce a test to highlight possible race Weakness in the current file caching of the changelog means that a writer can end up using an outdated docket. This might result in "committed" persistent-nodemap data from a previous writer to be overwritten by a later writer. This break the strong "append only" assumption of the persistent nodemap and can result in confused reader. The race windows are quite narrow. See the test documentation for details. The issues is fixed in the next changeset. Differential Revision: https://phab.mercurial-scm.org/D11481

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      # tiny extension to abort a transaction very late during test

      #

      # Copyright 2020 Pierre-Yves David <pierre-yves.david@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 mercurial import (

          error,

          transaction,

      )

      def abort(fp):

          raise error.Abort(b"This is a late abort")

      def reposetup(ui, repo):

          transaction.postfinalizegenerators.add(b'late-abort')

          class LateAbortRepo(repo.__class__):

              def transaction(self, *args, **kwargs):

                  tr = super(LateAbortRepo, self).transaction(*args, **kwargs)

                  tr.addfilegenerator(

                      b'late-abort', [b'late-abort'], abort, order=9999999

                  )

                  return tr

          repo.__class__ = LateAbortRepo

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				# tiny extension to abort a transaction very late during test
				#
				# Copyright 2020 Pierre-Yves David <pierre-yves.david@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 mercurial import (
				error,
				transaction,
				)


				def abort(fp):
				raise error.Abort(b"This is a late abort")


				def reposetup(ui, repo):

				transaction.postfinalizegenerators.add(b'late-abort')

				class LateAbortRepo(repo.__class__):
				def transaction(self, args, *kwargs):
				tr = super(LateAbortRepo, self).transaction(args, *kwargs)
				tr.addfilegenerator(
				b'late-abort', [b'late-abort'], abort, order=9999999
				)
				return tr

				repo.__class__ = LateAbortRepo