tools known working env

tools/flake.nix

@@ -4,22 +4,44 @@
   inputs = {
     flake-utils.url = "github:numtide/flake-utils";
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable-small";
+    # Added newest nixpkgs for an updated poetry package.
+    nixpkgs-newest.url = "github:NixOS/nixpkgs/nixos-unstable";
     poetry2nix = {
       url = "github:nix-community/poetry2nix";
       inputs.nixpkgs.follows = "nixpkgs";
     };
   };
 
-  outputs = { self, nixpkgs, flake-utils, poetry2nix }:
-    flake-utils.lib.eachDefaultSystem (system:
+  outputs =
+    {
+      self,
+      nixpkgs,
+      flake-utils,
+      poetry2nix,
+      nixpkgs-newest,
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
       let
-        # see https://github.com/nix-community/poetry2nix/tree/master#api for more functions and examples.
         pkgs = nixpkgs.legacyPackages.${system};
-        inherit (poetry2nix.lib.mkPoetry2Nix { inherit pkgs; }) mkPoetryApplication;
+        # Use the newest nixpkgs exclusively for the poetry package.
+        pkgsNew = nixpkgs-newest.legacyPackages.${system};
+        inherit (poetry2nix.lib.mkPoetry2Nix { inherit pkgs; }) mkPoetryApplication defaultPoetryOverrides;
+        inherit poetry2nix;
       in
       {
         packages = {
-          myapp = mkPoetryApplication { projectDir = self; preferWheels = true; };
+          myapp = mkPoetryApplication {
+            projectDir = self;
+            preferWheels = true;
+            overrides = defaultPoetryOverrides.extend (
+              self: super: {
+                umap = super.umap.overridePythonAttrs (old: {
+                  buildInputs = (old.buildInputs or [ ]) ++ [ super.setuptools ];
+                });
+              }
+            );
+          };
           default = self.packages.${system}.myapp;
         };
 
@@ -29,16 +51,20 @@
         #
         # Use this shell for developing your app.
         devShells.default = pkgs.mkShell {
-          inputsFrom = [ self.packages.${system}.myapp ];
+          inputsFrom = [
+            self.packages.${system}.myapp
+          ];
         };
 
         # Shell for poetry.
         #
         #     nix develop .#poetry
         #
-        # Use this shell for changes to pyproject.toml and poetry.lock.
+        # Here we use the poetry package from the newest nixpkgs input while keeping
+        # all other dependencies locked.
         devShells.poetry = pkgs.mkShell {
-          packages = [ pkgs.poetry ];
+          packages = [ pkgsNew.poetry ];
         };
-      });
+      }
+    );
 }