comparison mercurial/dirstate.py @ 22404:12bc7f06fc41

dirstate: add begin/endparentchange to dirstate

It's possible for the dirstate to become incoherent (issue4353) if there is an
exception in the middle of the dirstate parent and entries being written (like
if the user ctrl+c's). This change adds begin/endparentchange which a future
patch will require to be set before changing the dirstate parent.  This will
allow us to prevent writing the dirstate in the event of an exception while
changing the parent.

22403:41e9d58ec56f

        self._dirty = False
        self._dirtypl = False
        self._lastnormaltime = 0
        self._ui = ui
        self._filecache = {}

    @propertycache
    def _map(self):
        '''Return the dirstate contents as a map from filename to
        (state, mode, size, time).'''

                "_ignore"):
            if a in self.__dict__:
                delattr(self, a)
        self._lastnormaltime = 0
        self._dirty = False

    def copy(self, source, dest):
        """Mark dest as a copy of source. Unmark dest if source is None."""
        if source == dest:
            return

22404:12bc7f06fc41

        self._dirty = False
        self._dirtypl = False
        self._lastnormaltime = 0
        self._ui = ui
        self._filecache = {}
        self._parentwriters = 0

    def beginparentchange(self):
        '''Marks the beginning of a set of changes that involve changing
        the dirstate parents. If there is an exception during this time,
        the dirstate will not be written when the wlock is released. This
        prevents writing an incoherent dirstate where the parent doesn't
        match the contents.
        '''
        self._parentwriters += 1

    def endparentchange(self):
        '''Marks the end of a set of changes that involve changing the
        dirstate parents. Once all parent changes have been marked done,
        the wlock will be free to write the dirstate on release.
        '''
        if self._parentwriters > 0:
            self._parentwriters -= 1

    def pendingparentchange(self):
        '''Returns true if the dirstate is in the middle of a set of changes
        that modify the dirstate parent.
        '''
        return self._parentwriters > 0

    @propertycache
    def _map(self):
        '''Return the dirstate contents as a map from filename to
        (state, mode, size, time).'''

                "_ignore"):
            if a in self.__dict__:
                delattr(self, a)
        self._lastnormaltime = 0
        self._dirty = False
        self._parentwriters = 0

    def copy(self, source, dest):
        """Mark dest as a copy of source. Unmark dest if source is None."""
        if source == dest:
            return