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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)