Use flake-utils, use mkShell

This fixes the devshell on darwin

flake.lock

@@ -1,5 +1,23 @@
 {
   "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "gitignore": {
       "inputs": {
         "nixpkgs": [
@@ -38,9 +56,25 @@
     },
     "root": {
       "inputs": {
+        "flake-utils": "flake-utils",
         "gitignore": "gitignore",
         "nixpkgs": "nixpkgs"
       }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
     }
   },
   "root": "root",

flake.nix

@@ -3,57 +3,58 @@
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
     gitignore = {
       url = "github:hercules-ci/gitignore.nix";
       inputs.nixpkgs.follows = "nixpkgs";
     };
   };
 
-  outputs = { self, nixpkgs, gitignore }:
+  outputs = { self, nixpkgs, flake-utils, gitignore }: flake-utils.lib.eachDefaultSystem (system:
-  let
+    let
-    system = "x86_64-linux";
+      pkgs = import nixpkgs { inherit system; };
-    pkgs = nixpkgs.legacyPackages.${system};
 
-    vrnp-static = pkgs.buildGoModule {
+      vrnp-static = pkgs.buildGoModule {
-      pname = "vrnp";
+        pname = "vrnp";
-      version = "0.0.5";
+        version = "0.0.5";
-      vendorHash = null;
+        vendorHash = null;
 
-      # For building the package, we use only the files not ignored by Git as inputs.
+        # For building the package, we use only the files not ignored by Git as inputs.
-      # Also, flake.nix and flake.lock are not included to avoid annoying rebuilds when
+        # Also, flake.nix and flake.lock are not included to avoid annoying rebuilds when
-      # working on them.
+        # working on them.
-      src = pkgs.lib.cleanSourceWith {
+        src = pkgs.lib.cleanSourceWith {
-        src = gitignore.lib.gitignoreSource ./.;
+          src = gitignore.lib.gitignoreSource ./.;
-        filter = path: type: builtins.baseNameOf path != "flake.nix" && builtins.baseNameOf path != "flake.lock";
+          filter = path: type: builtins.baseNameOf path != "flake.nix" && builtins.baseNameOf path != "flake.lock";
-      };
-
-      # Avoid linking against libc
-      CGO_ENABLED = 0;
-    };
-  in {
-    devShell.${system} = pkgs.mkShellNoCC {
-      packages = [
-        pkgs.go
-        (pkgs.python3.withPackages (ps: with ps; [ pillow ]))
-      ];
-    };
-    packages.${system} = {
-      default = vrnp-static;
-      image-meta = pkgs.runCommand "vrnp-version" {} ''
-        mkdir -p $out
-        echo -n ${vrnp-static.version} > $out/version
-        echo -n git.pbrinkmeier.de/paul/vrnp:${vrnp-static.version} > $out/name
-      '';
-      image = pkgs.dockerTools.buildImage {
-        name = "git.pbrinkmeier.de/paul/vrnp";
-        tag = vrnp-static.version;
-        copyToRoot = pkgs.buildEnv {
-          name = "vrnp-root";
-          paths = [ vrnp-static pkgs.cacert ];
-          pathsToLink = [ "/bin" "/etc" ];
         };
-        config.Cmd = [ "${vrnp-static}/bin/vrnp" ];
+
+        # Avoid linking against libc
+        CGO_ENABLED = 0;
       };
-    };
+    in {
-  };
+      devShell = pkgs.mkShell {
+        packages = [
+          pkgs.go
+          (pkgs.python3.withPackages (ps: with ps; [ pillow ]))
+        ];
+      };
+      packages = {
+        default = vrnp-static;
+        image-meta = pkgs.runCommand "image-meta" {} ''
+          mkdir -p $out
+          echo -n ${vrnp-static.version} > $out/version
+          echo -n git.pbrinkmeier.de/paul/vrnp:${vrnp-static.version} > $out/name
+        '';
+        image = pkgs.dockerTools.buildImage {
+          name = "git.pbrinkmeier.de/paul/vrnp";
+          tag = vrnp-static.version;
+          copyToRoot = pkgs.buildEnv {
+            name = "vrnp-root";
+            paths = [ vrnp-static pkgs.cacert ];
+            pathsToLink = [ "/bin" "/etc" ];
+          };
+          config.Cmd = [ "${vrnp-static}/bin/vrnp" ];
+        };
+      };
+    }
+  );
 }