python: Rebuild all subpackages if required.

extra/python/build

@@ -8,3 +8,24 @@ make
 make DESTDIR="$1" install
 
 ln -s python3 "$1/usr/bin/python"
+
+# Rebuild all python subpackages if required.
+{
+    # Exit here if python is not installed.
+    command -v python3 >/dev/null || exit 0
+
+    # Figure out the system's python version.
+    python_sys=$(kiss l python)
+    python_sys=${python_sys#* }
+    python_sys=${python_sys#?.}
+    python_sys=${python_sys%.*}
+
+    # Figure out this python version.
+    read -r python_repo _ < "${0%/*}/version"
+    python_repo=${python_repo#?.}
+    python_repo=${python_repo%.*}
+
+    # If the two python versions match, exit here.
+    [ "$python_sys" = "$python_repo" ] ||
+        :>/tmp/python-REBUILD
+}

extra/python/post-install

@@ -0,0 +1,15 @@
+#!/bin/sh -e
+
+[ -f /tmp/python-REBUILD ] || exit 0
+
+rm -f /tmp/python-REBUILD
+
+# Rebuild all python subpackages if the above file existed.
+kiss l | while read -r pkg _; do
+    case $pkg in
+        python-*)
+            kiss build "$pkg"
+            kiss install "$pkg"
+        ;;
+    esac
+done

extra/python/version

@@ -1 +1 @@
-3.6.8 1
+3.6.8 2