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/interpreters/python/hooks/python-runtime-deps-check-hook.sh

@@ -0,0 +1,20 @@
+# Setup hook for PyPA installer.
+echo "Sourcing python-runtime-deps-check-hook"
+
+pythonRuntimeDepsCheckHook() {
+    echo "Executing pythonRuntimeDepsCheck"
+
+    export PYTHONPATH="$out/@pythonSitePackages@:$PYTHONPATH"
+
+    for wheel in dist/*.whl; do
+        echo "Checking runtime dependencies for $(basename $wheel)"
+        @pythonInterpreter@ @hook@ "$wheel"
+    done
+
+    echo "Finished executing pythonRuntimeDepsCheck"
+}
+
+if [ -z "${dontCheckRuntimeDeps-}" ]; then
+    echo "Using pythonRuntimeDepsCheckHook"
+    preInstallPhases+=" pythonRuntimeDepsCheckHook"
+fi