python: Add support for installing Python eggs

pkgs/development/interpreters/python/hooks/egg-install-hook.sh

@@ -0,0 +1,21 @@
+# Setup hook for eggs
+echo "Sourcing egg-install-hook"
+
+eggInstallPhase() {
+    echo "Executing eggInstallPhase"
+    runHook preInstall
+
+    mkdir -p "$out/@pythonSitePackages@"
+    export PYTHONPATH="$out/@pythonSitePackages@:$PYTHONPATH"
+
+    find
+    @pythonInterpreter@ -m easy_install --prefix="$out" *.egg
+
+    runHook postInstall
+    echo "Finished executing eggInstallPhase"
+}
+
+if [ -z "${dontUseEggInstall-}" ] && [ -z "${installPhase-}" ]; then
+    echo "Using eggInstallPhase"
+    installPhase=eggInstallPhase
+fi