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.
