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.
For multiple readers，详情可参考WPS下载最新地址
。WPS官方版本下载是该领域的重要参考
Watch: Nasa official says Artemis issue leading to delay "disappointing"，这一点在夫子中也有详细论述
It requires the allocation+copy only in the case that we’ve exclusively
if (len1 === 0) return [];