iankelling.org Git - automated-distro-installer/blob - fsf/close-crypt-luks-keys-loopback

   1 #!/bin/bash
   2
   3 # usage: $0
   4 # this script is idempotent
   5
   6 # warning: changes here may affect the open version of this script
   7
   8 if ! test "$BASH_VERSION"; then echo "error: shell is not bash" >&2; exit 1; fi
   9 shopt -s inherit_errexit 2>/dev/null ||: # ignore fail in bash < 4.4
  10 set -eE -o pipefail
  11 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" exit status: $?, PIPESTATUS: ${PIPESTATUS[*]}" >&2' ERR
  12
  13 m() { printf "%s\n" "$*";  "$@"; }
  14
  15
  16 fs_file=/root/crypt-luks-keys-loopback
  17 mapper_name=crypt-luks-keys-loopback
  18
  19 if mountpoint /mnt2 &>/dev/null; then
  20   m umount /mnt2
  21 fi
  22 if cryptsetup status /dev/mapper/$mapper_name &>/dev/null; then
  23   m cryptsetup luksClose /dev/mapper/$mapper_name; then
  24 fi
  25 l=$(losetup -l --noheadings | awk '$6 ~ /\/'$mapper_name'$/ {print $1}')
  26 if [[ $l ]]; then
  27   m losetup -d $l
  28 else
  29   echo "$0: warning: no loopback device found" >&2
  30 fi