Auto-upgrade with NixOS and NixOps
Since the end of last year NixOS has an auto-upgrade feature. Some weeks ago I decided to move my server from an unstable version of NixOS to the latest stable version. That made it easier for me to activate the auto-upgrade feature. However the first time the auto-upgrade was triggered it failed, since I deploy my server with NixOps and therefore there the file /etc/nixos/configuration.nix does not exist.
Until I have a real fix for this problem I decided to live with the workaround of copying the configuration with NixOps to the server and to create a custom configuration.nix that wraps around the NixOps configuration of the server. This resulted in the following code in my server configuration:
``` system.autoUpgrade.enable = true; system.autoUpgrade.channel = https://nixos.org/channels/nixos-16.03; systemd.services.nixos-upgrade.environment.NIXOS_CONFIG = pkgs.writeText "configuration.nix" '' all@{ lib, ... }: lib.filterAttrs (n: v: n != "deployment") ((import /etc/nixos/current/default.nix).server all) '';
system.activationScripts = { configuration = '' rm /etc/nixos/current/* #/ ln -s ${./.}/ /etc/nixos/current #*/ ''; }; ```
Here is the full configuration.
