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

track-tags: introduce first bits of tags tracking during transaction...

track-tags: introduce first bits of tags tracking during transaction This changeset introduces detection of tags changes during transaction. When this happens a 'tag_moved=1' argument is set for hooks, similar to what we do for bookmarks and phases. This code is disabled by default as there are still various performance concerns. Some require a smarter use of our existing tag caches and some other require rework around the transaction logic to skip execution when unneeded. These performance improvements have been delayed, I would like to be able to experiment and stabilize the feature behavior first. Later changesets will push the concept further and provide a way for hooks to know what are the actual changes introduced by the transaction. Similar work is needed for the other families of changes (bookmark, phase, obsolescence, etc). Upgrade of the transaction logic will likely be performed at the same time. The current code can report some false positive when .hgtags file changes but resulting tags are unchanged. This will be fixed in the next changeset. For testing, we simply globally enable a hook in the tag test as all the possible tag update cases should exist there. A couple of them show the false positive mentioned above. See in code documentation for more details.

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      # dirstateguard.py - class to allow restoring dirstate after failure

      #

      # Copyright 2005-2007 Matt Mackall <mpm@selenic.com>

      #

      # 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 .i18n import _

      from . import (

          error,

      )

      class dirstateguard(object):

          '''Restore dirstate at unexpected failure.

          At the construction, this class does:

          - write current ``repo.dirstate`` out, and

          - save ``.hg/dirstate`` into the backup file

          This restores ``.hg/dirstate`` from backup file, if ``release()``

          is invoked before ``close()``.

          This just removes the backup file at ``close()`` before ``release()``.

          '''

          def __init__(self, repo, name):

              self._repo = repo

              self._active = False

              self._closed = False

              self._suffix = '.backup.%s.%d' % (name, id(self))

              repo.dirstate.savebackup(repo.currenttransaction(), self._suffix)

              self._active = True

          def __del__(self):

              if self._active: # still active

                  # this may occur, even if this class is used correctly:

                  # for example, releasing other resources like transaction

                  # may raise exception before ``dirstateguard.release`` in

                  # ``release(tr, ....)``.

                  self._abort()

          def close(self):

              if not self._active: # already inactivated

                  msg = (_("can't close already inactivated backup: dirstate%s")

                         % self._suffix)

                  raise error.Abort(msg)

              self._repo.dirstate.clearbackup(self._repo.currenttransaction(),

                                               self._suffix)

              self._active = False

              self._closed = True

          def _abort(self):

              self._repo.dirstate.restorebackup(self._repo.currenttransaction(),

                                                 self._suffix)

              self._active = False

          def release(self):

              if not self._closed:

                  if not self._active: # already inactivated

                      msg = (_("can't release already inactivated backup:"

                               " dirstate%s")

                             % self._suffix)

                      raise error.Abort(msg)

                  self._abort()

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				# dirstateguard.py - class to allow restoring dirstate after failure
				#
				# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
				#
				# 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 .i18n import _

				from . import (
				error,
				)

				class dirstateguard(object):
				'''Restore dirstate at unexpected failure.

				At the construction, this class does:

				- write current ``repo.dirstate`` out, and
				- save ``.hg/dirstate`` into the backup file

				This restores ``.hg/dirstate`` from backup file, if ``release()``
				is invoked before ``close()``.

				This just removes the backup file at ``close()`` before ``release()``.
				'''

				def __init__(self, repo, name):
				self._repo = repo
				self._active = False
				self._closed = False
				self._suffix = '.backup.%s.%d' % (name, id(self))
				repo.dirstate.savebackup(repo.currenttransaction(), self._suffix)
				self._active = True

				def __del__(self):
				if self._active: # still active
				# this may occur, even if this class is used correctly:
				# for example, releasing other resources like transaction
				# may raise exception before ``dirstateguard.release`` in
				# ``release(tr, ....)``.
				self._abort()

				def close(self):
				if not self._active: # already inactivated
				msg = (_("can't close already inactivated backup: dirstate%s")
				% self._suffix)
				raise error.Abort(msg)

				self._repo.dirstate.clearbackup(self._repo.currenttransaction(),
				self._suffix)
				self._active = False
				self._closed = True

				def _abort(self):
				self._repo.dirstate.restorebackup(self._repo.currenttransaction(),
				self._suffix)
				self._active = False

				def release(self):
				if not self._closed:
				if not self._active: # already inactivated
				msg = (_("can't release already inactivated backup:"
				" dirstate%s")
				% self._suffix)
				raise error.Abort(msg)
				self._abort()