The suggested way to update NixOS on Turris is to build system on more powerful device and push only resulting build to the device. The reason for this are memory requirements for Nix itself. NixOS and its packages repository evaluation consumes a lot of memory and thus doing that on different PC is just faster.
You can use template from this repository. Navigate to directory where you want to create system configuration and invoke the following command:
nix flake init -t github:cynerd/nixturrisThis will copy over two files flake.nix and configuration.nix. You must set
Turris model in configuration.nix. Next you can add any configuration you want
to that file as well and build and deploy NixOS (update your target host):
nix build .
nix copy --to ssh://[email protected] $(readlink -f result)
ssh -t [email protected] sudo nix-env --profile /nix/var/nix/profiles/system --set "$(readlink -f result)"
ssh -t [email protected] /nix/var/nix/profiles/system/bin/switch-to-configuration switchThe first command builds NixOS and creates link result to it. The second
command copies it to Turris router. The third command sets system profile to it.
The last command performs the real configuration switch.
TODO describe here how to generate key, sign build and distribute it to the device.
Later when you want to update system you must run nix flake update before
build.
INFO: nixos-rebuild is not used here because it doesn’t support opt-in
cross-build. The only option is to hard-code the build platform to NixOS
configuration and that might not be desirable. The steps here are in short what
nixos-rebuild does and this a replacement.