of polling (scanning) communications lines and implementing the SDLC protocol
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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homebrew-core has one Ruby file per package formula, and every brew update used to clone or fetch the whole repository until it got large enough that GitHub explicitly asked them to stop. Homebrew 4.0 switched to downloading a JSON file over HTTP, because users wanted the current state of a package rather than its commit history. But updating a formula still means opening a pull request against homebrew-core, because git is where the collaboration tooling lives. Instead of using git as a database, what if you used a database as a git?