init commit

flake.lock

@@ -0,0 +1,26 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1750400657,
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "b2485d56967598da068b5a6946dadda8bfcbcd37",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-25.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,61 @@
+{
+  description = "A simple Go package";
+
+  # Nixpkgs / NixOS version to use.
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-25.05";
+
+  outputs =
+    { self, nixpkgs }:
+    let
+      # System types to support.
+      supportedSystems = [
+        "x86_64-linux"
+        "x86_64-darwin"
+        "aarch64-linux"
+        "aarch64-darwin"
+      ];
+
+      # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+
+      # Nixpkgs instantiated for supported system types.
+      nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });
+
+    in
+    {
+
+      # Provide some binary packages for selected system types.
+      packages = forAllSystems (
+        system:
+        let
+          pkgs = nixpkgsFor.${system};
+        in
+        {
+          go-hello = pkgs.callPackage ./package.nix { };
+        }
+      );
+
+      # Add dependencies that are only needed for development
+      devShells = forAllSystems (
+        system:
+        let
+          pkgs = nixpkgsFor.${system};
+        in
+        {
+          default = pkgs.mkShell {
+            buildInputs = with pkgs; [
+              go
+              gopls
+              gotools
+              go-tools
+            ];
+          };
+        }
+      );
+
+      # The default package for 'nix build'. This makes sense if the
+      # flake provides only one package or there is a clear "main"
+      # package.
+      defaultPackage = forAllSystems (system: self.packages.${system}.go-hello);
+    };
+}

go.mod

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+module example.com/go-hello
+
+go 1.16

main.go

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+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("Hello Nix!")
+}

package.nix

@@ -0,0 +1,25 @@
+{ buildGoModule, gitMinimal }:
+buildGoModule {
+  pname = "go-hello";
+  version = "v1.0.0";
+  # In 'nix develop', we don't need a copy of the source tree
+  # in the Nix store.
+  src = builtins.path {
+    name = "source";
+    path = ./.;
+  };
+  vendorHash = null;
+  buildInputs = [
+    gitMinimal
+  ];
+  # This hash locks the dependencies of this package. It is
+  # necessary because of how Go requires network access to resolve
+  # VCS.  See https://www.tweag.io/blog/2021-03-04-gomod2nix/ for
+  # details. Normally one can build with a fake hash and rely on native Go
+  # mechanisms to tell you what the hash should be or determine what
+  # it should be "out-of-band" with other tooling (eg. gomod2nix).
+  # To begin with it is recommended to set this, but one must
+  # remember to bump this hash when your dependencies change.
+  # vendorHash = pkgs.lib.fakeHash;
+
+}