nix: initial copying over of flake.nix from deepdog, might not work

flake.nix

@@ -1,55 +1,46 @@
 {
   description = "Application packaged using poetry2nix";
 
-  inputs.flake-utils.url = "github:numtide/flake-utils?rev=0f8662f1319ad6abf89b3380dd2722369fc51ade";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs?rev=e194871435cad8ffb1d64b64fb7df3b2b8a10088";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs";
-  inputs.poetry2nix.url = "github:nix-community/poetry2nix?rev=7b71679fa7df00e1678fc3f1d1d4f5f372341b63";
+  inputs.poetry2nixSrc = {
+    url = "github:nix-community/poetry2nix";
+    inputs.nixpkgs.follows = "nixpkgs";
+  };
 
-  outputs = { self, nixpkgs, flake-utils, poetry2nix }:
+  outputs = { self, nixpkgs, flake-utils, poetry2nixSrc }:
-    {
+    flake-utils.lib.eachDefaultSystem (system:
-      # Nixpkgs overlay providing the application
-      overlay = nixpkgs.lib.composeManyExtensions [
-        poetry2nix.overlay
-        (final: prev: {
-          # The application
-          tantri = prev.poetry2nix.mkPoetryApplication {
-            overrides = [
-              prev.poetry2nix.defaultPoetryOverrides
-            ];
-            projectDir = ./.;
-          };
-          tantriEnv = prev.poetry2nix.mkPoetryEnv {
-            overrides = [
-              prev.poetry2nix.defaultPoetryOverrides
-            ];
-            projectDir = ./.;
-          };
-        })
-      ];
-    } // (flake-utils.lib.eachDefaultSystem (system:
       let
-        pkgs = import nixpkgs {
+        pkgs = nixpkgs.legacyPackages.${system};
-          inherit system;
+	poetry2nix = poetry2nixSrc.lib.mkPoetry2Nix { inherit pkgs; };
-          overlays = [ self.overlay ];
+      in {
-        };
+        packages = {
-      in
+	  tantriApp = poetry2nix.mkPoetryApplication {
-      {
+            projectDir = self;
-        apps = {
+	    python = pkgs.python39;
-          tantri = pkgs.tantri;
+	    preferWheels = true;
-        };
+	  };
-
+	  tantriEnv = poetry2nix.mkPoetryEnv {
-        defaultApp = pkgs.tantri;
+	    projectDir = self;
-        devShell = pkgs.mkShell {
+	    python = pkgs.python39;
-          buildInputs = [
+	    preferWheels = true;
-            pkgs.poetry
+	    overrides = poetry2nix.overrides.withDefaults (self: super: {
-            pkgs.tantriEnv
+	    });
-            pkgs.tantri
+	  };
-          ];
+	  default = self.packages.${system}.tantriEnv;
-          shellHook = ''
+	};
-            export DO_NIX_CUSTOM=1
+	devShells.default = pkgs.mkShell {
-          '';
+	  inputsFrom = [ self.packages.${system}.tantriEnv ];
-          packages = [ pkgs.nodejs-16_x pkgs.gnupg ];
+	  buildInputs = [
-        };
+	    pkgs.poetry
-
+	    self.packages.${system}.tantriEnv
-      }));
+	    self.packages.${system}.tantriApp
+	    pkgs.just
+	  ];
+	  shellHook = ''
+	    export DO_NIX_CUSTOM=1
+	  '';
+	};
+      }
+    );
 }