#!/bin/bash

# usage: $0
# this script is idempotent

# warning: changes here may affect the open version of this script

if ! test "$BASH_VERSION"; then echo "error: shell is not bash" >&2; exit 1; fi
shopt -s inherit_errexit 2>/dev/null ||: # ignore fail in bash < 4.4
set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" exit status: $?, PIPESTATUS: ${PIPESTATUS[*]}" >&2' ERR

m() { printf "%s\n" "$*";  "$@"; }


fs_file=/root/crypt-luks-keys-loopback
mapper_name=crypt-luks-keys-loopback

if mountpoint /mnt2 &>/dev/null; then
  m umount /mnt2
fi
if cryptsetup status /dev/mapper/$mapper_name &>/dev/null; then
  m cryptsetup luksClose /dev/mapper/$mapper_name; then
fi
l=$(losetup -l --noheadings | awk '$6 ~ /\/'$mapper_name'$/ {print $1}')
if [[ $l ]]; then
  m losetup -d $l
else
  echo "$0: warning: no loopback device found" >&2
fi