poetry: add naive impl of build-system.requires

src/specifications/subsystems/python/dream-lock-schema.json

@@ -11,7 +11,11 @@
           "type": "object"
         },
         "application": { "type": "boolean" },
-        "pythonAttr": { "type": "string" }
+        "pythonAttr": { "type": "string" },
+        "buildRequirements": {
+          "type": "array",
+          "items": { "type": "string" }
+        }
       }
     }
   }

src/subsystems/python/builders/simple-python/default.nix

@@ -46,7 +46,6 @@
         [pkgs.autoPatchelfHook]
         ++ (with python.pkgs; [
           pip
-          poetry-core
           wheel
         ]);
       propagatedBuildInputs = [python.pkgs.setuptools];
@@ -61,15 +60,21 @@
           fname=$(stripHash $fname)
           cp $file dist/$fname
         done
-        ${python}/bin/python -m pip install \
-          --find-links ./dist/ \
+
+        mkdir -p "$out/${python.sitePackages}"
+        export PYTHONPATH="$out/${python.sitePackages}:$PYTHONPATH"
+
+        pipInstallFlags="--find-links ./dist/ \
           --no-build-isolation \
           --no-index \
           --no-warn-script-location \
           --prefix="$out" \
           --no-cache \
-          . \
-          $pipInstallFlags
+          --ignore-installed \
+          $pipInstallFlags"
+        ${python}/bin/python -m pip install $pipInstallFlags ${lib.concatStringsSep " " subsystemAttrs.buildRequirements}
+        ${python}/bin/python -m pip wheel --verbose --no-index --no-deps --no-clean --no-build-isolation --wheel-dir dist .
+        ${python}/bin/python -m pip install $pipInstallFlags .\
       '';
       installPhase = "true";
     });

src/subsystems/python/translators/poetry/default.nix

@@ -115,6 +115,7 @@ in {
         application = false;
         pythonAttr = "python3";
         sourceFormats = {};
+        buildRequirements = pyproject.build-system.requires or [];
       };
 
       cyclicDependencies = {};