radicale: [NEW] Python-based CalDAV/CardDAV Server

Inspired by OpenWrt Ticket System Ticket 9119
Python3 package currently marked as @BROKEN because no time for testing.

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>

net/radicale/files/radicale.hotplug

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+# only (re-)start on ifup
+[ "$ACTION" = "ifup" ] || exit 0
+
+_PID=$(ps | grep '[p]ython.*[r]adicale' 2>/dev/null | awk '{print \$1}')
+kill -1 $_PID 2>/dev/null
+if [ $? -eq 0 ]; then
+	# only restart if already running
+	logger -p user.info -t "radicale[$_PID]" \
+		"Restart request due to '$ACTION' of interface '$INTERFACE'"
+	/etc/init.d/radicale restart
+else
+	# only start if enabled
+	/etc/init.d/radicale enabled && /etc/init.d/radicale start
+fi