Merge pull request #190 from hercules-ci/template-package

Add template/package

template/package/flake.nix

@@ -0,0 +1,21 @@
+{
+  description = "Description for the project";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = inputs@{ flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      systems = [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" "x86_64-darwin" ];
+      perSystem = { config, pkgs, ... }: {
+        packages.default = config.packages.hello;
+
+        packages.hello = pkgs.callPackage ./hello/package.nix { };
+
+        checks.hello = pkgs.callPackage ./hello/test.nix {
+          hello = config.packages.hello;
+        };
+      };
+    };
+}

template/package/hello/hello.sh

@@ -0,0 +1,3 @@
+#!@shell@
+
+echo Hello world

template/package/hello/package.nix

@@ -0,0 +1,22 @@
+{ stdenv, lib, runtimeShell }:
+
+# Example package in the style that `mkDerivation`-based packages in Nixpkgs are written.
+stdenv.mkDerivation (finalAttrs: {
+  name = "hello";
+  src = lib.cleanSourceWith {
+    src = ./.;
+    filter = path: type:
+      type == "regular" -> baseNameOf path == "hello.sh";
+  };
+  buildPhase = ''
+    # Note that Nixpkgs has builder functions for simple packages
+    # like this, but this template avoids it to make for a more
+    # complete example.
+    substitute hello.sh hello --replace '@shell@' ${runtimeShell}
+    cat hello
+    chmod a+x hello
+  '';
+  installPhase = ''
+    install -D hello $out/bin/hello
+  '';
+})

template/package/hello/test.nix

@@ -0,0 +1,12 @@
+{ hello, runCommand }:
+
+runCommand "test-hello"
+{
+  inherit hello;
+} '' 
+  (
+    set -x
+    [[ "Hello world" == "$(${hello}/bin/hello)" ]]
+  )
+  touch $out
+''