I have successfully flakified my system and HM config by making a flake (inspired by @gvolpe 's implementation) with
...
outputs = inputs @ { self, nixpkgs, nurpkgs, nixpkgsUnstable, home-manager }:
let
system = "x86_64-linux";
in
{
homeConfigurations = (
import ./outputs/home-conf.nix {
inherit system;
inherit (inputs) nixpkgs nurpkgs nixpkgsUnstable home-manager;
}
);
nixosConfigurations = (
import ./outputs/nixos-conf.nix {
inherit (nixpkgs) lib;
inherit inputs system;
}
);
...
and in ./outputs/home-conf.nix
{ system, nixpkgs, nurpkgs, nixpkgsUnstable, home-manager, ... }:
let
mkHome = username: (
let
homeDirectory = "/home/${username}"; # TODO: if darwin then /Users/${username}
configHome = "${homeDirectory}/.config";
pkgs = import nixpkgs {
inherit system;
config.allowUnfree = true;
config.android_sdk.accept_license = true;
config.xdg.configHome = configHome;
overlays = [
nurpkgs.overlay
] ++ (import ../home/${username}/overlays);
};
unstable = import nixpkgsUnstable {
inherit system;
config.allowUnfree = true;
config.android_sdk.accept_license = true;
config.xdg.configHome = configHome;
};
nur = import nurpkgs {
inherit pkgs;
nurpkgs = pkgs;
};
conf = (
import ../home/${username}/home.nix {
inherit nur pkgs unstable username homeDirectory;
inherit (pkgs) config lib stdenv;
});
in
home-manager.lib.homeManagerConfiguration rec {
inherit pkgs system username homeDirectory;
extraSpecialArgs = { inherit unstable; };
stateVersion = "21.11";
configuration = conf;
});
in
{
jeroen = mkHome "jeroen";
}
So far so good…
But now I need to override my generic home definitions with some host-specific ones. I refer to dotfiles and settings from ../home/${username}/home.nix like this:
imports = [
../users-hm-common.nix # default packages for all users
./themes
] ++ (import ./programs)
++ (import ./services)
where the respective ./programs/default.nix is a list of references to subdirs like ./programs/autorandr/ with corresponding HM-config settings in its default.nix
But since things like autorandr are configured differently depending on host, my idea was to do something like this:
let
hostDefaultNix = "default-${hostname}.nix";
in
{
imports = [
../users-hm-common.nix # default packages for all users
./themes
] ++ (import ./programs) ++ (if builtins.pathExists ./programs/${hostDefaultNix} then import ./programs/${hostDefaultNix} else [])
++ (import ./services) ++ (if builtins.pathExists ./services/${hostDefaultNix} then import ./services/${hostDefaultNix} else []);
but for that I need to know the hostname that was set by this flake when doing
nixos-rebuild switch --use-remote-sudo --flake .#$(hostname -s)
when I build the HM config with
nix build .#homeConfigurations.${USER}.activationPackage
result/activate -b bak
How to achieve this?
BTW: to complete the transition I’d also need to get rid of the hard-coded system value from the main flake, since it should take the value of the host on which it is built. (I’m not considering remote builds for this setup)
