chore: get pyzmq with scikit-build-core working in a somewhat reasona…

…ble way

overrides/build-systems.json

@@ -20244,7 +20244,7 @@
       "until": "26.0.0"
     },
     {
-      "buildSystem": "scikit-build",
+      "buildSystem": "scikit-build-core",
       "from": "26.0.0"
     }
   ],

overrides/default.nix

@@ -2939,6 +2939,18 @@ lib.composeManyExtensions [
         old: {
           nativeBuildInputs = (old.nativeBuildInputs or [ ]) ++ [ pkg-config ];
           propagatedBuildInputs = (old.propagatedBuildInputs or [ ]) ++ [ pkgs.zeromq ];
+          # setting dontUseCmakeConfigure is necessary because:
+          #
+          # 1. pyzmq uses scikit-build-core as of pyzmq version 26.0.0
+          # 2. scikit-build-core requires the *Python* cmake package to find the cmake binary
+          # 3. since scikit-build-core's is in nativeBuildInputs and python
+          #    cmake depends on pkgs.cmake that puts cmake in pyzmq's
+          #    nativeBuildInputs
+          # 4. point 3 causes the pyzmq build it use vanilla cmake configure
+          #    instead of cmake via scikit-build-core
+          #
+          # what a heaping mess
+          dontUseCmakeConfigure = lib.versionAtLeast old.version "26.0.0";
         }
       );
 
@@ -3256,6 +3268,19 @@ lib.composeManyExtensions [
         } else old
       );
 
+      scikit-build-core = super.scikit-build-core.overridePythonAttrs (
+        old: {
+          propagatedBuildInputs = old.propagatedBuildInputs or [ ] ++ [
+            self.pyproject-metadata
+            self.pathspec
+            # these are _intentionally_ the *Python* wrappers for cmake and
+            # ninja, both of which are used by scikit-build-core
+            self.cmake
+            self.ninja
+          ];
+        }
+      );
+
       scikit-image = super.scikit-image.overridePythonAttrs (
         old: {
           nativeBuildInputs = (old.nativeBuildInputs or [ ]) ++ [

tests/default.nix

@@ -160,6 +160,7 @@ in
   scientific = callTest ./scientific { };
   apsw = callTest ./apsw { };
   no-infinite-recur-on-missing-gitignores = callTest ./no-infinite-recur-on-missing-gitignores { };
+  pyzmq = callTest ./pyzmq { };
 } // lib.optionalAttrs (!stdenv.isDarwin) {
   # pyqt5 = (callTest ./pyqt5 { });
   pyqt6 = callTest ./pyqt6 { };

tests/pyzmq/default.nix

@@ -0,0 +1,11 @@
+{ poetry2nix, python3, runCommand }:
+let
+  env = poetry2nix.mkPoetryEnv {
+    python = python3;
+    pyproject = ./pyproject.toml;
+    poetrylock = ./poetry.lock;
+  };
+in
+runCommand "pyzmq-test" { } ''
+  ${env}/bin/python -c 'import zmq; print(zmq.__version__)' > $out
+''