mount_newroot.sh

#!/bin/sh -eu

for SRC in /root/bin/luks_NEW*.inc ; do [ ! -s "${SRC}" ] || . "${SRC}" ; done
if [ -z "${NEWROOT:-}" ]; then
  echo 'ERROR: var NEWROOT not set'
  return 1 2>/dev/null || exit 1
fi

. /root/bin/luks_debian.inc

for SRC in /root/bin/luks_func*.inc ; do . "${SRC}" ; done

MOUNTBASE='/mnt/newroot'

[ -d "${MOUNTBASE}" ] || mkdir "${MOUNTBASE}"

start_fs_subdevs NEWROOT

grep -q -F -e "${MOUNTBASE} " /proc/mounts || {
  echo "Mounting ${NEWROOTMOUNT} on ${MOUNTBASE}"
  while mount "${NEWROOTMOUNT}" "${MOUNTBASE}" 2>/dev/null
   do
    :
  done
}

if [ -d "${MOUNTBASE}/boot" ]; then
  if [ "${1:-}" != 'noboot' ]; then
    grep -q -F -e "${MOUNTBASE}/boot " /proc/mounts || {
      echo "Mounting ${NEWBOOTMOUNT} on ${MOUNTBASE}/boot"
      while mount "${NEWBOOTMOUNT}" "${MOUNTBASE}/boot" 2>/dev/null
       do
        :
      done
    }
    grep -q -F -e "${MOUNTBASE}/boot " /proc/mounts || {
      echo "Mounting ${NEWBOOTMOUNT} on ${MOUNTBASE}/boot via bind of /boot"
      mount --bind /boot "${MOUNTBASE}/boot"
    }
  else
    grep -q -F -e "${MOUNTBASE}/boot " /proc/mounts && {
      echo "Unmounting ${MOUNTBASE}/boot"
      while umount "${MOUNTBASE}/boot" 2>/dev/null
       do
        :
      done
    }
  fi
fi

mount_sys.sh "${MOUNTBASE}"

echo "${MOUNTBASE} is set up as following..."
mount | grep -F -e "${MOUNTBASE}"