- fetch channels (nix-channels --update)
- inform about failures
- collect garbage (nix-collect-garbage & nix-collect-garbage --delete-old / nix-collect-garbage --delete-older-than)
- update store-env apps (future)
- update nix-env apps
- fetch channels (nix-channels --update)
- inform about failures
- collect garbage (nix-collect-garbage & nix-collect-garbage --delete-old / nix-collect-garbage --delete-older-than)
- nixos-rebuild
- est size and prepare changelog
- download & build
- ask for switch
- switch on reboot
- switch right now
- ignore derivation
- rollback system