Verification Method
Stream.pull() creates a lazy pipeline. The compress and encrypt transforms don't run until you start iterating output. Each iteration pulls data through the pipeline on demand.
，这一点在safew官方版本下载中也有详细论述
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Thus, there’s the /usr/etc folder containing the immutable version of configuration files, and /etc which is the mutable directory. If I modify a file in /etc and ask OSTree to compare with the new version, it will show me the differences and preserve my local modifications.