#!/bin/sh
usage() {
  exec >&2
  echo "Usage: $0 <blockdev>"
  exit 1
}
[ -b "$1" ] || usage

quietly() { "$@" >/dev/null 2>&1; }
quietly umount /plaintext
quietly dmsetup remove samizdatcrypt

parted "$1" mklabel gpt
grok-block "$1"