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runner: overlay-root appliance mode

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every.channel 2026-02-17 02:26:09 -08:00
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evolution/proposals/ECP-0065-nixos-runner-images.md
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@ -15,6 +15,7 @@ The runner system:
- is defined in-repo as a `nixosConfiguration` in `flake.nix`,
- exports the repo source tree inside the OS at a stable path (read-only) so the node can self-build and verify from the same flake,
- uses `ec-node` as the primary long-running publisher binary, with orchestration via NixOS + systemd.
- defaults to a read-only root filesystem with a tmpfs-backed overlayfs upperdir (appliance semantics), while image/bootstrap variants (netboot/ISO/sdimage) may disable this where it conflicts with their initrd/root setup.
Initial implementation targets `aarch64-linux` builds first (local builds via OrbStack). `x86_64-linux` is defined in the flake but may not be built until an x86 builder is available.