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LUKS encrypt a squashfs disk image
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| #!/bin/sh | |
| # https://martin.elwin.com/blog/2008/05/backups-with-squashfs-and-luks/ | |
| set -e | |
| SQUASHFS_IMG="$1" | |
| LUKS_IMG="$2" | |
| CRYPTNAME=mkcrypt-$RANDOM | |
| CRYPTDEV="/dev/mapper/$CRYPTNAME" | |
| OVERHEAD=32768 | |
| BLOCKCOUNT=$(du --block-size=512 "$SQUASHFS_IMG" | cut -f1) | |
| dd if=/dev/zero of="$LUKS_IMG" bs=512 count=1 seek=$(($BLOCKCOUNT + $OVERHEAD)) | |
| LOOPDEV=$(losetup -f) | |
| losetup "$LOOPDEV" "$LUKS_IMG" | |
| cryptsetup luksFormat "$LOOPDEV" | |
| cryptsetup luksOpen "$LOOPDEV" "$CRYPTNAME" | |
| if test $(blockdev --getsize "$CRYPTDEV") -lt $BLOCKCOUNT; then | |
| DELTA=$(( $BLOCKCOUNT - $(blockdev --getsize "$CRYPTDEV") )) | |
| echo "Cannot fit image into available space! Increase overhead by $DELTA" | |
| cryptsetup luksClose "$CRYPTNAME" | |
| losetup -d "$LOOPDEV" | |
| rm "$LUKS_IMG" | |
| exit 1 | |
| fi | |
| dd if="$SQUASHFS_IMG" of="$CRYPTDEV" status=progress | |
| cryptsetup luksClose "$CRYPTNAME" | |
| losetup -d "$LOOPDEV" | |
| echo "Complete! You may delete $SQUASHFS_IMG after testing the output." |
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