upstream/mercurial-mirror Files · mercurial/txnutil.py

checkheads: upgrade the obsolescence postprocessing logic (issue4354)...

checkheads: upgrade the obsolescence postprocessing logic (issue4354) The previous logic had many shortcoming (eg: looking at the head only, not handling prune, etc...), the new logic use a more robust approach: For each head, we check if after the push all changesets exclusive to this heads will be obsolete. If they are, the branch considered be "replaced". To check if a changeset will be obsolete, we simply checks: * the changeset phase * the existence of a marker relevant to the "pushed set" that affects the changesets.. This fixes two major issues of the previous algorithm: * branch partially rewritten (eg: head but not root) are no longer detected as replaced, * Prune are now properly handled. (This implementation was introduction in the evolve extension, version 6.0.0.) This new algorithm has an extended number of tests, a basic one is provided in this patch. The others will be introduced in their own changeset for clarity. In addition, we stop trying to process heads unknown locally, we do not have enough data to take an informed decision so we should stop pretending we do. This reflect a test that is now update.

FUJIWARA Katsunori - - Load All Authors

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      # txnutil.py - transaction related utilities

      #

      #  Copyright FUJIWARA Katsunori <foozy@lares.dti.ne.jp> and others

      #

      # 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

      import errno

      from . import (

          encoding,

      )

      def mayhavepending(root):

          '''return whether 'root' may have pending changes, which are

          visible to this process.

          '''

          return root == encoding.environ.get('HG_PENDING')

      def trypending(root, vfs, filename, **kwargs):

          '''Open  file to be read according to HG_PENDING environment variable

          This opens '.pending' of specified 'filename' only when HG_PENDING

          is equal to 'root'.

          This returns '(fp, is_pending_opened)' tuple.

          '''

          if mayhavepending(root):

              try:

                  return (vfs('%s.pending' % filename, **kwargs), True)

              except IOError as inst:

                  if inst.errno != errno.ENOENT:

                      raise

          return (vfs(filename, **kwargs), False)

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				# txnutil.py - transaction related utilities
				#
				# Copyright FUJIWARA Katsunori <foozy@lares.dti.ne.jp> and others
				#
				# 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

				import errno

				from . import (
				encoding,
				)

				def mayhavepending(root):
				'''return whether 'root' may have pending changes, which are
				visible to this process.
				'''
				return root == encoding.environ.get('HG_PENDING')

				def trypending(root, vfs, filename, **kwargs):
				'''Open file to be read according to HG_PENDING environment variable

				This opens '.pending' of specified 'filename' only when HG_PENDING
				is equal to 'root'.

				This returns '(fp, is_pending_opened)' tuple.
				'''
				if mayhavepending(root):
				try:
				return (vfs('%s.pending' % filename, **kwargs), True)
				except IOError as inst:
				if inst.errno != errno.ENOENT:
				raise
				return (vfs(filename, **kwargs), False)