remaster/src/func/chroot_umount

#!/bin/bash
#remaster lib
[ -d "<LIBDIR>" ] || { echo "LIBDIR not exist"; exit 1; }

#chroot_umount [chroot_dir]
function chroot_umount() {
	echo -n "unmount chroot ... "

	#check chroot dir
	chroot_dir="$1"
	[ -d "$chroot_dir" ] || {
		echo "### ERROR ### chroot_umount: chroot directory not exist!"
		return 12
	}

	for d in "$chroot_dir/tmp" "$chroot_dir/root" "$chroot_dir/proc" "$chroot_dir/dev" ; do
   		umount $d
   		retval=$?
   		[ "$retval" -gt 0 ] && {
      		echo "### ERROR ### chroot_umount: can't umount \"$d\"!"
      		return 21
   		}
	done

	echo "done"
}

#this func is standalone executable
[ -n "$1" ] && {
  chroot_umount $@
}