Squashfs + LUKS 設定摘要

#!/bin/bash

OVERHEAD=32768

YOUR_PASSPHRASE=12345
SQUASHFS_IMG="/tmp/a.sqfs"
LUKS_IMG="/tmp/cryptbackupluks.img"

LOOP_DEV="/dev/loop0"
MAPPER_NAME="secretfs"

rm ${LUKS_IMG};
BLOCKCOUNT=$(du --block-size=512 "$SQUASHFS_IMG" | cut -f1)
dd if=/dev/zero of="$LUKS_IMG" bs=512 count=1 seek=$(($BLOCKCOUNT + $OVERHEAD))

losetup ${LOOP_DEV} ${LUKS_IMG}

#cryptsetup -y luksFormat ${LOOP_DEV}
#cryptsetup luksOpen ${LOOP_DEV} ${MAPPER_NAME}

cryptsetup luksFormat --type luks2 ${LOOP_DEV} <<< ${YOUR_PASSPHRASE} ||exit $?
#cryptsetup luksFormat ${LOOP_DEV} <<< ${YOUR_PASSPHRASE} ||exit $?
cryptsetup luksOpen ${LOOP_DEV} ${MAPPER_NAME} <<< ${YOUR_PASSPHRASE} ||exit $?

echo =================================
dd if=${SQUASHFS_IMG} of=/dev/mapper/${MAPPER_NAME} status=progress

 cryptsetup luksClose ${MAPPER_NAME}
losetup -d ${LOOP_DEV}