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target.read_tree_values() has several weaknesses. It doesn't support files with ':' in their name, and it fails when reading binary files. In essence, these limitations are cause by its fragile implementation based on grep in shutils. In order to robustify read_tree_values(), use tar and base64 to send the content of a tree to the host, which can then process it from there. In the process, read_tree_values() gains two new arguments: - decode_unicode: must be set to work text/utf-8 content; - strip_null_chars: must be set to remove '\00' chars from text files. Both are set to true by default to keep backward compatibility with the existing code. Suggested-by: Douglas Raillard <douglas.raillard@arm.com> Signed-off-by: Quentin Perret <quentin.perret@arm.com>