Now we are in 2026, and on the verge of the GTK 4.22 release. A good time to review how far we’ve come.
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.
，这一点在搜狗输入法2026中也有详细论述
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