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#!/bin/sh
set -eu
set -o pipefail
if [ -e /dev/mapper/cryptdir ]; then
echo "only one instance can run at a time" 1>&2
exit 1
fi
sudo -v || exit 1
if [ -z "${1:-}" ]; then
size='16M'
else
size=$1
fi
cryptfile=$(mktemp)
cryptdir=$(mktemp -d)
pass=$(dd if=/dev/urandom bs=1 count=80 | base64)
cleanup() {
set +e
cd
sudo umount "$cryptdir"
sudo cryptsetup close cryptdir
rm -f "$cryptfile"
rmdir "$cryptdir"
}
trap cleanup EXIT
dd if=/dev/urandom of="$cryptfile" bs="$size" count=1
echo "$pass" | sudo cryptsetup luksFormat "$cryptfile" -
echo "$pass" | sudo cryptsetup open "$cryptfile" cryptdir --key-file -
sudo mkfs.ext2 /dev/mapper/cryptdir
sudo mount /dev/mapper/cryptdir "$cryptdir"
sudo chown "$USER" "$cryptdir"
cd "$cryptdir"
$SHELL
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