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

   1 #!/bin/bash
   2
   3 # usage: $0
   4 # this script is idempotent
   5
   6 # warning: changes here may affect the close version of this script
   7
   8
   9 if ! test "$BASH_VERSION"; then echo "error: shell is not bash" >&2; exit 1; fi
  10 shopt -s inherit_errexit 2>/dev/null ||: # ignore fail in bash < 4.4
  11 set -eE -o pipefail
  12 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" exit status: $?, PIPESTATUS: ${PIPESTATUS[*]}" >&2' ERR
  13
  14 m() { printf "%s\n" "$*";  "$@"; }
  15
  16
  17 fs_file=/root/crypt-luks-keys-loopback
  18 mapper_name=crypt-luks-keys-loopback
  19
  20 l=$(losetup -j $fs_file | sed -rn 's/^([^ ]+): .*/\1/p' | head -n1 ||:)
  21 if [[ $l ]]; then
  22   echo "$0: skipping losetup due to existing loopback: $l"
  23 else
  24   l=$(losetup -f)
  25   m losetup $l $fs_file
  26 fi
  27 if cryptsetup status /dev/mapper/$mapper_name &>/dev/null; then
  28   echo "$0: skipping cryptsetup due to existing /dev/mapper/$mapper_name"
  29 else
  30   if ! cryptsetup luksOpen $l $mapper_name; then
  31     echo "$0: error luksOpen failed. detaching loopback" >&2
  32     m losetup -d $l
  33     exit 1
  34   fi
  35 fi
  36 if mountpoint -q /dev/mapper/$mapper_name; then
  37   echo "$0: skipping mount /dev/mapper/$mapper_name /mnt2 due to existing mount"
  38 else
  39   m mount /dev/mapper/$mapper_name /mnt2
  40 fi