Migrate to poetry, update nixpkgs

flake.nix

@@ -2,15 +2,11 @@
   description = "A very basic flake";
 
   inputs = {
-    nixpkgs.url = "nixpkgs/nixos-20.09";
+    nixpkgs.url = "nixpkgs/nixos-21.05";
     utils.url = "github:numtide/flake-utils";
-    pypi2nix = {
-      url = "github:nix-community/pypi2nix";
-      flake = false;
-    };
   };
 
-  outputs = { self, nixpkgs, utils, pypi2nix }:
+  outputs = { self, nixpkgs, utils }:
     {
       overlay = final: prev: {
         strojnadzor = self.packages.${final.system}.strojnadzor;
@@ -36,49 +32,19 @@
     } // utils.lib.eachSystem [ "x86_64-linux" ] (
       system: let
         pkgs = nixpkgs.legacyPackages.${system};
-        python = import ./requirements.nix { inherit pkgs; };
-        pypi2nix' = import pypi2nix;
       in
         rec {
           devShell = pkgs.mkShell {
             name = "strojnadzor-env";
             buildInputs = [
               pkgs.nodejs
-              pypi2nix
-              python.interpreter
+              pkgs.python38Packages.poetry
             ];
           };
 
-          packages.strojnadzor = python.mkDerivation {
-            pname = "strojnadzor";
-            version = "0.0.1";
-            src = pkgs.nix-gitignore.gitignoreSource [] ./.;
-            buildInputs = [];
-            propagatedBuildInputs = with python.packages; [
-              aldryn-forms
-              django-absolute
-              django-cms
-              django-emailit
-              django-filer
-              django-sekizai
-              django-simple-captcha
-              django-treebeard
-              djangocms-bootstrap4
-              djangocms-file
-              djangocms-googlemap
-              djangocms-icon
-              djangocms-link
-              djangocms-picture
-              djangocms-snippet
-              djangocms-style
-              djangocms-text-ckeditor
-              djangocms-video
-              easy-thumbnails
-              gunicorn
-              python-dotenv
-              setuptools
-            ];
-            passthru.exePath = "/bin/strojnadzor-admin";
+          packages.strojnadzor = pkgs.poetry2nix.mkPoetryApplication {
+            projectDir = ./.;
+            python = pkgs.python38;
           };
           defaultPackage = packages.strojnadzor;