using flakes for devshell without reimporting nixpkgs multiple times

pkgs/clan-cli/.envrc

@@ -1 +1 @@
-use nix
+use flake .#clan

pkgs/clan-cli/default.nix

@@ -1,11 +1,11 @@
-{ pkgs ? import <nixpkgs> { }
-, lib ? pkgs.lib
-, python3 ? pkgs.python3
-, ruff ? pkgs.ruff
-, runCommand ? pkgs.runCommand
-, installShellFiles ? pkgs.installShellFiles
-, zerotierone ? pkgs.zerotierone
-, bubblewrap ? pkgs.bubblewrap
+{ pkgs
+, lib
+, python3
+, ruff
+, runCommand
+, installShellFiles
+, zerotierone
+, bubblewrap
 }:
 let
   pyproject = builtins.fromTOML (builtins.readFile ./pyproject.toml);

pkgs/clan-cli/flake-module.nix

@@ -4,9 +4,11 @@
       pyproject = builtins.fromTOML (builtins.readFile ./pyproject.toml);
       name = pyproject.project.name;
       package = pkgs.callPackage ./default.nix { };
+      shell = pkgs.callPackage ./shell.nix { };
     in
     {
       packages.${name} = package;
+      devShells.${name} = shell;
       packages.default = package;
       checks = package.tests;
     };

pkgs/clan-cli/shell.nix

@@ -1,13 +1,7 @@
-{ pkgs ? import <nixpkgs> { }
-,
-}:
+{ pkgs }:
 let
-  lib = pkgs.lib;
-  python3 = pkgs.python3;
-  package = import ./default.nix {
-    inherit lib python3;
-  };
-  pythonWithDeps = python3.withPackages (
+  package = pkgs.callPackage ./default.nix { };
+  pythonWithDeps = pkgs.python3.withPackages (
     ps:
     package.propagatedBuildInputs
     ++ package.devDependencies
@@ -18,39 +12,38 @@ let
   checkScript = pkgs.writeScriptBin "check" ''
     nix build -f . tests -L "$@"
   '';
-  devShell = pkgs.mkShell {
-    packages = [
-      pkgs.ruff
-      pythonWithDeps
-    ];
-    # sets up an editable install and add enty points to $PATH
-    CLAN_NIXPKGS = pkgs.path;
-    shellHook = ''
-      tmp_path=$(realpath ./.pythonenv)
-      repo_root=$(realpath .)
-      rm -rf $tmp_path
-      mkdir -p "$tmp_path/${pythonWithDeps.sitePackages}"
-
-      ${pythonWithDeps.interpreter} -m pip install \
-        --quiet \
-        --disable-pip-version-check \
-        --no-index \
-        --no-build-isolation \
-        --prefix "$tmp_path" \
-        --editable $repo_root
-
-      export PATH="$tmp_path/bin:${checkScript}/bin:$PATH"
-      export PYTHONPATH="$repo_root:$tmp_path/${pythonWithDeps.sitePackages}"
-
-      export XDG_DATA_DIRS="$tmp_path/share''${XDG_DATA_DIRS:+:$XDG_DATA_DIRS}"
-      export fish_complete_path="$tmp_path/share/fish/vendor_completions.d''${fish_complete_path:+:$fish_complete_path}"
-      mkdir -p \
-        $tmp_path/share/fish/vendor_completions.d \
-        $tmp_path/share/bash-completion/completions \
-        $tmp_path/share/zsh/site-functions
-      register-python-argcomplete --shell fish clan > $tmp_path/share/fish/vendor_completions.d/clan.fish
-      register-python-argcomplete --shell bash clan > $tmp_path/share/bash-completion/completions/clan
-    '';
-  };
 in
-devShell
+pkgs.mkShell {
+  packages = [
+    pkgs.ruff
+    pythonWithDeps
+  ];
+  # sets up an editable install and add enty points to $PATH
+  CLAN_NIXPKGS = pkgs.path;
+  shellHook = ''
+    tmp_path=$(realpath ./.pythonenv)
+    repo_root=$(realpath .)
+    rm -rf $tmp_path
+    mkdir -p "$tmp_path/${pythonWithDeps.sitePackages}"
+
+    ${pythonWithDeps.interpreter} -m pip install \
+      --quiet \
+      --disable-pip-version-check \
+      --no-index \
+      --no-build-isolation \
+      --prefix "$tmp_path" \
+      --editable $repo_root
+
+    export PATH="$tmp_path/bin:${checkScript}/bin:$PATH"
+    export PYTHONPATH="$repo_root:$tmp_path/${pythonWithDeps.sitePackages}"
+
+    export XDG_DATA_DIRS="$tmp_path/share''${XDG_DATA_DIRS:+:$XDG_DATA_DIRS}"
+    export fish_complete_path="$tmp_path/share/fish/vendor_completions.d''${fish_complete_path:+:$fish_complete_path}"
+    mkdir -p \
+      $tmp_path/share/fish/vendor_completions.d \
+      $tmp_path/share/bash-completion/completions \
+      $tmp_path/share/zsh/site-functions
+    register-python-argcomplete --shell fish clan > $tmp_path/share/fish/vendor_completions.d/clan.fish
+    register-python-argcomplete --shell bash clan > $tmp_path/share/bash-completion/completions/clan
+  '';
+}