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#!/bin/sh
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=$(mktemp -d)
dd if=/dev/urandom of=$cryptfile bs=$size count=1
echo "secretpass" | sudo cryptsetup luksFormat $cryptfile -
echo "secretpass" | 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
cd
sudo umount $cryptdir
sudo cryptsetup close cryptdir
rm -f $cryptfile
rmdir $cryptdir
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