#!/bin/sh

set -e

NAME=foo
FILE=/.$NAME.fs
FSIZE=1
DIR=/mnt/$NAME
KEYDIR=/root
###

cryptmount=$(which cryptmount)
if [ -z "$cryptmount" ]; then echo "sorry, no cryptmount installed"; exit; fi

btrfs=$(which btrfs)
if [ -z "$btrfs" ]; then echo "sorry, no btrfs-tools installed"; exit; fi

echo "generating $FILE (takes while) ..."
dd if=/dev/zero of=$FILE bs=1G count=$FSIZE

cp -f /etc/cryptmount/cmtab /etc/cryptmount/cmtab.$(date -I).bak
cat >> /etc/cryptmount/cmtab <<EOF
# created by $(basename $0)
$NAME {
dev=$FILE
dir=$DIR
fstype=btrfs
mountoptions=noatime
cipher=aes
keyformat=builtin
keyfile=$KEYDIR/$NAME.key
flags=user,nofsck
}
EOF

echo "generating key: $NAME .."
$cryptmount --generate-key 32 $NAME
$cryptmount --prepare $NAME

echo "making btrfs on: $NAME ..."
mkfs.btrfs /dev/mapper/$NAME
mkdir -p $DIR
mount -t btrfs -o noatime /dev/mapper/$NAME $DIR

echo "creating btrfs subvolumes on: $DIR: "
$btrfs subvolume create $DIR/rsnapshot
$btrfs subvolume create $DIR/rsnapshot/hourly.0
$btrfs subvolume create $DIR/rsnapshot/hourly.1
$btrfs subvolume create $DIR/rsnapshot/hourly.2
$btrfs subvolume create $DIR/rsnapshot/hourly.3
$btrfs subvolume create $DIR/rsnapshot/hourly.4
$btrfs subvolume create $DIR/rsnapshot/weekly.0
$btrfs subvolume create $DIR/rsnapshot/weekly.1
$btrfs fi df $DIR
$btrfs subvolume list $DIR
exit 0