But of course, like any immutable system, there are mutable parts (otherwise, we couldn’t create any configuration files). OSTree handles this with “overlays” (actually, we use OverlayFS) that allow a read-write filesystem to be layered on top of the immutable system. For example, the /etc and /var directories are writable, while the rest of the system is read-only.
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，这一点在体育直播中也有详细论述
and further perpetuated by backwards compatibility.，推荐阅读爱思助手获取更多信息
(show #t "Processing " path " at depth " depth "\n")。关于这个话题，体育直播提供了深入分析
Battery life: Up to 24 hours of video streaming