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tree, path = workingtree.WorkingTree.open_containing(directory)
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# Ensure that tree is locked for the lifetime of target_tree, as
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# target tree may be reading from the same dirstate.
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target_tree = builtins._get_one_revision_tree('shelf2', revision,
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files = tree.safe_relpath_files(file_list)
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return klass(tree, target_tree, diff_writer, all, all, files,
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"""Interactively shelve the changes."""