Merge pull request #1 from nais/install-with-nix

Add a nix build

flake.nix

@@ -0,0 +1,60 @@
+{
+  description = "Narcos";
+
+  # Nixpkgs / NixOS version to use.
+  inputs.nixpkgs.url = "github:nixos/nixpkgs";
+
+  outputs = { self, nixpkgs }:
+    let
+
+      # Generate a user-friendly version number.
+      version = builtins.substring 0 8 self.lastModifiedDate;
+
+      # 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; });
+
+      # Remove .gits etc from the build inputs
+      src = nixpkgs.lib.cleanSource ./.;
+
+    in {
+
+      # Provide some binary packages for selected system types.
+      packages = forAllSystems (system:
+        let pkgs = nixpkgsFor.${system};
+        in {
+          # The default package for 'nix build'. This makes sense if the
+          # flake provides only one package or there is a clear "main"
+          # package.
+          default = pkgs.buildGoModule {
+            pname = "narcos";
+            inherit version;
+            inherit src;
+
+            # how do i goflags this?
+            postInstall = ''
+              mv $out/bin/cmd $out/bin/narc
+            '';
+
+            # 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 sha256 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
+            # remeber to bump this hash when your dependencies change.
+            #vendorSha256 = pkgs.lib.fakeSha256;
+
+            vendorSha256 =
+              "sha256-gJrXz6fUp4xlUg2X4zTid1ORUIqZiPqXo5THSCtIS8E=";
+          };
+        });
+    };
+}