config/flake.nix

{
  description = "pbsds' system/home flake";

  inputs.nixpkgs.url      = "github:NixOS/nixpkgs/nixos-22.11-small";
  inputs.unstable.url     = "github:NixOS/nixpkgs/nixos-unstable-small";
  inputs.nur.url          = "github:nix-community/NUR";
  inputs.home-manager.url = "github:nix-community/home-manager"; #/release-22.11";
  inputs.home-manager.inputs.nixpkgs.follows = "nixpkgs";
  inputs.nixos-hardware.url = "github:NixOS/nixos-hardware";

  #TODO:
  #sops-nix.url = "github:Mic92/sops-nix";
  #sops-nix.inputs.nixpkgs.follows = "nixpkgs";
  #matrix-next.url = "github:dali99/nixos-matrix-modules"; # see https://git.pvv.ntnu.no/Drift/pvv-nixos-config/src/main/flake.nix

  # temp
  inputs.pr-polaris14.url = "github:pbsds/nixpkgs/polaris-14";

  outputs = {
    self,
    nixpkgs,
    unstable,
    nixos-hardware,
    nur,
    home-manager,
    ...
  } @ inputs:
  let
    nixlib = nixpkgs.lib;
    systems = [
      "x86_64-linux"
      "aarch64-linux"
      #"riscv64-linux"
    ];
    forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system);
    overlays = nixlib.mapAttrsToList (name: val: val) self.overlays;

    tmpConfig = {
      disabledModules = [ "services/misc/polaris.nix" ];
      imports = [ "${inputs.pr-polaris14}/nixos/modules/services/misc/polaris.nix" ];
      nixpkgs.overlays = [(final: prev: { # TODO: nixpkgs.config.packageOverrides ?
        polaris     = prev.callPackage "${inputs.pr-polaris14}/pkgs/servers/polaris" { };
        polaris-web = prev.callPackage "${inputs.pr-polaris14}/pkgs/servers/polaris/web.nix" { };
      })];
    };
    mkConfig = hostname: system: modules: nixpkgs.lib.nixosSystem {
      inherit system;
      specialArgs = { inherit inputs; };
      modules = modules ++ [ ./base.nix "${self}/hosts/${hostname}" tmpConfig ({
        networking.hostName = hostname;
        networking.domain   = "pbsds.net";
        networking.search = [ "pbsds.net" ];
        nixpkgs.overlays = [ # TODO: consider nixpkgs.config.packageOverrides
          #(final: prev: self.packages.${system})
          (final: prev: {
            unstable = unstable.legacyPackages.${final.system};
            #unstable = import unstable { inherit system; };
            nur      = import nur { inherit (prev) pkgs; nurpkgs = prev.pkgs; };
            #nur      = import nur { inherit (prev) pkgs; nurpkgs = import nixpkgs { inherit final.system: }; }; # TODO: nurpkgs?
          })
        ];
        # This makes commandline tools like 'nix run nixpkgs#hello'
        # and 'nix-shell -p hello' use the same channel as system was built with
        nix.registry.nixpkgs.flake  = inputs.nixpkgs;
        nix.registry.unstable.flake = inputs.unstable;
        nix.nixPath = [
          "nixpkgs=${inputs.nixpkgs}"
          "unstable=${inputs.unstable}" # TODO: needed?
        ];
      })];
    };
  in {

    inherit inputs;

    overlays.remote-exec = (final: prev: {
      remote-exec = prev.python3Packages.callPackage ./pkgs/remote-exec.nix {};
    });

    packages = forAllSystems(system:
      let pkgs = import nixpkgs { inherit system overlays; };
      in { inherit (pkgs) remote-exec; }
    );

    nixosConfigurations.noximilien = mkConfig "noximilien" "x86_64-linux" (with nixos-hardware.nixosModules; [ common-pc common-pc-ssd common-cpu-intel ]);
    nixosConfigurations.bolle      = mkConfig "bolle"      "x86_64-linux" (with nixos-hardware.nixosModules; [ common-pc common-pc-ssd common-cpu-intel ]);
    nixosConfigurations.nord       = mkConfig "nord"       "x86_64-linux" (with nixos-hardware.nixosModules; [ common-pc common-pc-ssd common-cpu-intel-cpu-only common-gpu-amd ]);

    homeConfigurations = forAllSystems (system: {
      pbsds = home-manager.lib.homeManagerConfiguration {
        pkgs = nixpkgs.legacyPackages.${system};
        modules = [ ./users/pbsds/home ];
      };
    });

    devShells = forAllSystems (system: { # TODO: apply my overlays?
      non-nixos = nixpkgs.legacyPackages.${system}.mkShell {
        packages =  with nixpkgs.legacyPackages.${system}; [
          nix-output-monitor
          nixos-rebuild
          home-manager
        ];
      };
      remote = nixpkgs.legacyPackages.${system}.mkShell {
        packages =  with nixpkgs.legacyPackages.${system}; [
          nix-output-monitor
          self.packages.${system}.remote-exec
          yq
        ];
      };
    });

  };
}