flake template for setting up a dev environment.

buildflake.nix

{
  description = "A very basic build flake";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs";
    unstable.url = "github:nixos/nixpkgs?ref=nixos-unstable";
  };

  # note - helpful to use devenv + nix-devenv so shell modifications stay in place and you don't need to type "nix develop" every time.

  outputs = { self, nixpkgs, unstable, }: 
  let 
	supportedSystems = ["x86_64-linux"];
	forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
    nixpkgsFor = forAllSystems(system: import nixpkgs { inherit system; });

   in {

    packages = forAllSystems(system:
		let pkgs = nixpkgsFor.${system};
		in {


          default = pkgs.stdenv.mkDerivation {
            name = "hello";
            src = ./.;
            buildPhase = ''
              echo "Hello" > hello.txt
            '';
            installPhase = ''
              mkdir -p $out
              cp hello.txt $out/
            '';
          };
		}
	);
  };
}

flake.nix

{
  description = "A very basic flake";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs";
    unstable.url = "github:nixos/nixpkgs?ref=nixos-unstable";
  };

  # note - helpful to use devenv + nix-devenv so shell modifications stay in place and you don't need to type "nix develop" every time.

  outputs = { self, nixpkgs, unstable, }: 
  let 
	supportedSystems = ["x86_64-linux"];
	forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
    nixpkgsFor = forAllSystems(system: import nixpkgs { inherit system; });
   in {

	devShells = forAllSystems(system:
		let pkgs = nixpkgsFor.${system};
		in {
			default = pkgs.mkShell {
				nativeBuildInputs = [pkgs.zig];
			};

			# get packages required by the listed packages and bundle into the shell
			#inputsFrom = [ 
             # self.packages.${system}.container
              #self.packages.${system}.go-hello-native
            #];
		}
	);
  };
}

for buildflake.nix, remember to rename flake.nix