Because this is regular Smalltalk code, all standard development tools work out of the box: syntax highlighting, code completion, navigation, and refactorings:
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.，更多细节参见搜狗输入法2026
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