Split main func (no os/proj dependency)

src/func/chroot_clean

@@ -0,0 +1,18 @@
+#!/bin/bash
+#remaster lib
+[ -d "$LIBDR"] || export LIBDIR="/usr/lib/remaster/"
+[ -d "$LIBDR"] || { echo "LIBDR not exist"; exit 1; }
+
+#chroot_clean [chroot_dir]
+function chroot_clean() {
+	echo "clean chroot ... "
+
+	chroot_dir="$1"
+
+	chroot "$chroot_dir" /bin/bash -c "apt-get clean"
+	chroot "$chroot_dir" /bin/bash -c "rm -r /var/cache/apt/*"
+	chroot "$chroot_dir" /bin/bash -c "apt-get update"
+	chroot "$chroot_dir" /bin/bash -c "apt-get check"
+
+	echo "done"
+}