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Initial nix-ota implementation

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Self-hostable OTA update system for NixOS fleets: a control server,
device agent, publisher CLI, and NixOS modules that ship prebuilt
system closures from a binary cache to devices that don't have the
flake.

- crates/common: signed manifest types (ed25519), store-path validator
- crates/server: axum + sqlite + HTMX dashboard, channel/device API
- crates/agent: poll, verify signature + revision, nix copy, switch,
  health check, magic-rollback on failure
- crates/publisher: keygen + sign + publish CLI for operators/CI
- nix/modules: NixOS modules for server and agent
- nix/tests/ota.nix: end-to-end VM test exercising publish A -> B ->
  broken C -> rollback to B (passes)

The control server never holds the signing key; manifests are signed
offline and verified against a pinned public key on each device.
This commit is contained in:
0m.ax 2026-05-25 14:58:42 +02:00
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