python3.pkgs.pythonRuntimeDepsCheckHook: init

Implements a hook, that checks whether all dependencies, as specified by
the wheel manifest, are present in the current environment.

Complains about missing packages, as well as version specifier
mismatches.

pkgs/development/python-modules/bootstrap/packaging/default.nix

@@ -0,0 +1,30 @@
+{ stdenv
+, python
+, flit-core
+, installer
+, packaging
+}:
+
+stdenv.mkDerivation {
+  pname = "${python.libPrefix}-bootstrap-${packaging.pname}";
+  inherit (packaging) version src meta;
+
+  buildPhase = ''
+    runHook preBuild
+
+    PYTHONPATH="${flit-core}/${python.sitePackages}" \
+      ${python.interpreter} -m flit_core.wheel
+
+    runHook postBuild
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    PYTHONPATH="${installer}/${python.sitePackages}" \
+      ${python.interpreter} -m installer \
+        --destdir "$out" --prefix "" dist/*.whl
+
+    runHook postInstall
+  '';
+}