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zE%s exists, but it should be owned by current user with permissions %sN) r makedirsr1 errnoEEXISTZcheck_permissionsr rL oct)rH rI rJ Z exceptionr r r rK s rK w)r8 rI chmodr c C sH f }|dk r|f}f }t j| tjtjB tjB f| }tj||f| S )zSafely open a file.
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