#!/bin/sh
set -eu

command="$1"
name="$2"
file="${HOME}/crypt/${name}.luks"
dev="/dev/mapper/$name"

case "$command" in
create)
    size=$3
    count=${4:-1}
    dd if=/dev/urandom of="$file" bs="$size" count="$count" iflag=fullblock
    sudo cryptsetup luksFormat "$file"
    sudo cryptsetup open "$file" "$name"
    sudo mkfs.ext4 "$dev"
    sudo mount "$dev" /mnt
    sudo chown "$USER" /mnt
    sudo umount /mnt
    sudo cryptsetup close "$name"
    ;;
open)
    sudo cryptsetup open "$file" "$name"
    sudo mount "$dev" /mnt
    ;;
close)
    sudo umount /mnt
    sudo cryptsetup close "$name"
    ;;
esac