Refactor how version is set

default.nix

@@ -5,11 +5,11 @@
 let
   inherit (pkgs) lib;
   dirty = lib.optionalString (!(self ? rev)) "_dirty";
-  rev = "0.1.0+git${self.lastModifiedDate}${dirty}";
+  version = "0.1.0+git${self.lastModifiedDate}${dirty}";
 in
 {
   nix-alien = pkgs.callPackage ./nix-alien.nix {
-    inherit rev;
+    inherit version;
     inherit (self.inputs) nix-filter;
     python3 = pkgs.python310;
     nix-index = self.inputs.nix-index-database.packages.${pkgs.system}.nix-index-with-db;

nix-alien.nix

@@ -8,18 +8,16 @@
     narHash = "sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=";
   }
 , python3
-, rev ? null
-, dev ? false
+, version
 }:
 
 let
-  version = if (rev != null) then rev else "dev";
   deps = (lib.importTOML ./pyproject.toml).project.dependencies;
 in
 python3.pkgs.buildPythonApplication {
+  inherit version;
   pname = "nix-alien";
   format = "pyproject";
-  inherit version;
 
   src = nix-filter.lib {
     root = ./.;
@@ -39,16 +37,14 @@ python3.pkgs.buildPythonApplication {
     setuptools
   ] ++ (lib.attrVals deps python3.pkgs);
 
-  preBuild = lib.optionalString (rev != null) ''
-    echo "__version__ = \"${rev}\"" > nix_alien/_version.py
+  preBuild = ''
+    echo "__version__ = \"${version}\"" > nix_alien/_version.py
     substituteInPlace {nix_alien,tests}/*.{py,nix} \
       --subst-var-by nixpkgsLastModifiedDate ${nixpkgs-src.lastModifiedDate} \
       --subst-var-by nixpkgsRev ${nixpkgs-src.rev} \
       --subst-var-by nixpkgsHash ${nixpkgs-src.narHash}
   '';
 
-  doCheck = !dev;
-
   nativeCheckInputs = with python3.pkgs; [
     pytestCheckHook
   ];

shell.nix

@@ -3,7 +3,9 @@
 }:
 
 let
-  nix-alien = self.outputs.packages.${pkgs.system}.nix-alien.override { dev = true; };
+  nix-alien = self.outputs.packages.${pkgs.system}.nix-alien.overrideAttrs (
+    oldAttrs: { doCheck = false; }
+  );
   python-with-packages = pkgs.python3.withPackages (ps: with ps; [
     black
     mypy