#!/bin/bash

i=1
maxWait=60

while [ $i -le $(sed "s/#.*$//" /etc/crypttab | grep -vc '^ *$') ]; do
  s="$(sed "s/#.*$//" /etc/crypttab | grep -v '^ *$' | tail -n$i | head -n1 | sed "s/  */ /g")"
  name=$(echo $s | awk '{print $1}')
  device=$(echo $s | awk '{print $2}')
  key=$(echo $s | awk '{print $3}')
  while [ ${maxWait} -gt 0 ] && [ ! -b "${device}" ]; do
    sleep 1
    maxWait=$[${maxWait}-1]
  done
  if [ "$1" == "-u" ]; then
    if ! /usr/sbin/cryptsetup luksClose "${name}"; then
      >&2 echo "FEHLER: cryptsetup luksClose $name"
      exit 1
    fi
  else
    if ! /usr/sbin/cryptsetup luksOpen "${device}" "${name}" --key-file "${key}"; then
      >&2 echo "FEHLER: cryptsetup luksOpen ${device} ${name} --key-file ${key}"
      exit 1
    fi
  fi
  i=$((i+1))
done