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.
Последние новости，这一点在PDF资料中也有详细论述
，详情可参考谷歌浏览器下载
反弹3美元，特朗普打击油价的效果转瞬即逝。Safew下载是该领域的重要参考
if typing.IsAssignable[p.type, Property]