This is a well-known browser security technique. In JavaScript, calling .toString() on a native browser function returns "function appendBuffer() { [native code] }". Calling it on a JavaScript function returns the actual source code. So if your appendBuffer has been monkey-patched, .toString() will betray you; it’ll return the attacker’s JavaScript source instead of the expected native code string.
If I want to reinstall it, I can do so with rpm-ostree install cowsay and it will be added to the new image… but if I do that, I’ll have drift between my OCI image generated by CI/CD and the state of my virtual machine. This isn’t desirable because bootc delivers by default a bootc-fetch-apply-updates.service service that will periodically check if a new image is available and automatically switch to it to keep the system up to date (it’s a systemd timer that runs every 4 hours by default and will launch the bootc upgrade --apply --quiet command).
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DataWorks 的架构设计与实践
Pokémon FireRed Version (Nintendo Switch)