await blocking.writer.write(chunk2); // ok
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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For running trusted code that you wrote and reviewed, Docker with a seccomp profile is probably fine. The isolation is against accidental interference, not adversarial escape.
В Финляндии предупредили об опасном шаге ЕС против России09:28
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Producer: Ben Ellman