nix flake check system example

#nix flake check system example

nix flake check git+https://gist.github.com/7dec32408bd8355f6cf86381243cfd90.git

flake.lock

{
  "nodes": {
    "nixpkgs": {
      "info": {
        "lastModified": 1592752255,
        "narHash": "sha256-ptxZTlo8sf1k8G3oWUGTzVXSx2IYavEZIEy1sxBxElI="
      },
      "locked": {
        "owner": "NixOS",
        "repo": "nixpkgs",
        "rev": "7daa00707d30cc74d153c6a5134721be1955c1ca",
        "type": "github"
      },
      "original": {
        "id": "nixpkgs",
        "type": "indirect"
      }
    },
    "root": {
      "inputs": {
        "nixpkgs": "nixpkgs"
      }
    }
  },
  "root": "root",
  "version": 5
}

flake.nix

{
  outputs = { self, nixpkgs }:
    with nixpkgs.lib;
    let
      forAllSystems = genAttrs (attrNames nixpkgs.legacyPackages);
    in
    {
      apps = forAllSystems (system: {
        hello = {
          type = "app";
          program = "${nixpkgs.legacyPackages.${system}.writeShellScript "hello" "echo Hello"}";
        };
      });
    };
}