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bzrlib/inventory.py
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        # first requested, or preload them if they're already known
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        pass            # nothing to do by default
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    def _forget_tree_state(self):
 
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        pass
 
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class RootEntry(InventoryEntry):
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        self.text_sha1 = work_tree.get_file_sha1(self.file_id)
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        self.executable = work_tree.is_executable(self.file_id)
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    def _forget_tree_state(self):
 
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        self.text_sha1 = None
 
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        self.executable = None
 
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    def _snapshot_text(self, file_parents, work_tree, weave_store, transaction):
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        """See InventoryEntry._snapshot_text."""
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        mutter('storing file {%s} in revision {%s}',
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        """See InventoryEntry._read_tree_state."""
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        self.symlink_target = work_tree.get_symlink_target(self.file_id)
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    def _forget_tree_state(self):
 
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        self.symlink_target = None
 
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    def _unchanged(self, previous_ie):
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        """See InventoryEntry._unchanged."""
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        compatible = super(InventoryLink, self)._unchanged(previous_ie)
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        from bzrlib.workingtree import gen_file_id
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        parts = bzrlib.osutils.splitpath(relpath)
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        if len(parts) == 0:
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            raise BzrError("cannot re-add root of inventory")
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        if file_id == None:
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            file_id = gen_file_id(relpath)
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        parent_path = parts[:-1]
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        parent_id = self.path2id(parent_path)
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        if parent_id == None:
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            raise NotVersionedError(path=parent_path)
 
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        if len(parts) == 0:
 
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            self.root = RootEntry(file_id)
 
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            self._byid = {self.root.file_id: self.root}
 
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            return
 
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        else:
 
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            parent_path = parts[:-1]
 
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            parent_id = self.path2id(parent_path)
 
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            if parent_id == None:
 
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                raise NotVersionedError(path=parent_path)
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        if kind == 'directory':
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            ie = InventoryDirectory(file_id, parts[-1], parent_id)
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        elif kind == 'file':
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        """
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        ie = self[file_id]
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        assert self[ie.parent_id].children[ie.name] == ie
 
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        assert ie.parent_id is None or \
 
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            self[ie.parent_id].children[ie.name] == ie
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        # TODO: Test deleting all children; maybe hoist to a separate
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        # deltree method?
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        if ie.kind == 'directory':
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            for cie in ie.children.values():
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                del self[cie.file_id]
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            del ie.children
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        del self._byid[file_id]
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        del self[ie.parent_id].children[ie.name]
 
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        if ie.parent_id is not None:
 
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            del self[ie.parent_id].children[ie.name]
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    def __eq__(self, other):