chore: update flake to latest nixpkgs + out-of-tree poetry2nix

Prepare for poetry2nix removal in nixpkgs

Author: K900

flake.lock

@@ -1,20 +1,20 @@
 {
  description = "NixOps: a tool for deploying to [NixOS](https://nixos.org) machines in a network or the cloud";
 
- inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+ inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable-small";
+
+ inputs.poetry2nix.url = "github:nix-community/poetry2nix";
+ inputs.poetry2nix.inputs.nixpkgs.follows = "nixpkgs";
 
  inputs.utils.url = "github:numtide/flake-utils";
 
- outputs = { self, nixpkgs, utils }: utils.lib.eachDefaultSystem (system: let
+ outputs = { self, nixpkgs, poetry2nix, utils }: utils.lib.eachDefaultSystem (system: let
  pkgs = import nixpkgs { inherit system; };
+ poetry2nix' = import poetry2nix { inherit pkgs; };
 
- pythonEnv = (pkgs.poetry2nix.mkPoetryEnv {
+ pythonEnv = poetry2nix'.mkPoetryEnv {
  projectDir = ./.;
- overrides = [
- pkgs.poetry2nix.defaultPoetryOverrides
- (import ./overrides.nix { inherit pkgs; })
- ];
- });
+ };
  linters.doc = pkgs.writers.writeBashBin "lint-docs" ''
  set -eux
  # When running it in the Nix sandbox, there is no git repository
@@ -57,22 +57,14 @@
 
  defaultApp = apps.default;
 
- packages.default = let
- overrides = import ./overrides.nix { inherit pkgs; };
-
- in pkgs.poetry2nix.mkPoetryApplication {
+ packages.default = poetry2nix'.mkPoetryApplication {
  projectDir = ./.;
 
  propagatedBuildInputs = [
  pkgs.openssh
  pkgs.rsync
  ];
 
- overrides = [
- pkgs.poetry2nix.defaultPoetryOverrides
- overrides
- ];
-
  # TODO: Re-add manual build
  };
 
@@ -118,7 +110,7 @@
  name = "nixops-docs";
  # we use cleanPythonSources because the default gitignore
  # implementation doesn't support the restricted evaluation
- src = pkgs.poetry2nix.cleanPythonSources {
+ src = poetry2nix'.cleanPythonSources {
  src = ./.;
  };
 
@@ -138,7 +130,7 @@
  name = "check-lint-docs";
  # we use cleanPythonSources because the default gitignore
  # implementation doesn't support the restricted evaluation
- src = pkgs.poetry2nix.cleanPythonSources {
+ src = poetry2nix'.cleanPythonSources {
  src = ./.;
  };
  dontBuild = true;