NixOS Compose Tutorial

Making MADbench2 available

Option 1: You have a flake reprository with MADbench2 packaged

In the flake.nix file, add your reprository as an input:

{
  description = "nixos-compose - basic setup";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/21.05";
    nxc.url = "git+https://gitlab.inria.fr/nixos-compose/nixos-compose.git";
    mypkgs.url = "URL TO YOUR PKGS";
  };
  outputs = { self, nixpkgs, nxc, mypkgs }:
  {
    # ...
  };
}

Then create an overlay with adding the benchmark:

{
  # ...

  outputs = { self, nixpkgs, nxc, mypkgs }:
    let
      system = "x86_64-linux";
      myOverlay = final: prev:
        {
          mb2 = mypkgs.packages.${system}.MADbench2;
        };
    in {
      packages.${system} = nxc.lib.compose {
        inherit nixpkgs system;
        overlays = [ myOverlay ];
        composition = ./composition.nix;
        # setup = ./setup.toml;
      };

      # ...
};

Option 2: You have a local file packaging MADbench2

In this case, you do not have to add another input, and you can simply call the Nix file packaging MADbench2 (MADbench2.nix in the example below).

Similarly, we create an overlay with the package to add.

{
  description = "nixos-compose - basic setup";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/22.05";
    nxc.url = "git+https://gitlab.inria.fr/nixos-compose/nixos-compose.git";
  };

  outputs = { self, nixpkgs, nxc }:
    let
      system = "x86_64-linux";
      myOverlay = final: prev:
        {
          mb2 = prev.callPackage ./MADbench2 { };
        };
    in {
      packages.${system} = nxc.lib.compose {
        inherit nixpkgs system;
        overlays = [ myOverlay ];
        composition = ./composition.nix;
        setup = ./setup.toml;
      };

      defaultPackage.${system} =
        self.packages.${system}."composition::nixos-test";

      devShell.${system} = nxc.devShells.${system}.nxcShellFull;
    };
}