Split main func (no os/proj dependency)

src/func/check_dependency

@@ -0,0 +1,16 @@
+#!/bin/bash
+#remaster lib
+[ -d "$LIBDR"] || export LIBDIR="/usr/lib/remaster/"
+[ -d "$LIBDR"] || { echo "LIBDR not exist"; exit 1; }
+
+#check_dependency
+# -> 0 | -> 16
+function check_dependency() {
+	for packet in squashfs-tools xorriso wget sed sendemail; do
+		[ "`dpkg -l $packet 2>&1`" == "dpkg-query: Kein Paket gefunden, das auf $packet passt" ] && {
+			echo "### ERROR ### Packet $packet not installed"
+			return 16
+		}
+	done
+	return 0
+}