#!/bin/bash
backupcfg="/etc/backup.cfg"

if [ $UID -ne 0 ]; then
	echo "Keine Rootrechte."
	exit 1
fi

#test -f "${backupcfg}" && echo "${backupcfg} existiert" && exit 1

# find all disks
declare -A disk_tmp=()
declare -A disk=()
index=0
for i in $(find /dev/disk/by-id/ -type l -printf "%P\n" | grep usb | grep -v part | tac ); do
	name="$(readlink -f /dev/disk/by-id/"${i}")"
	if [[ "${name}" =~ *"^[0-9]+$"* ]]; then
		continue
	fi
	if [[ "${name}" == *"dm"* ]]; then
		continue
	fi
	if [[ "${name}" == *"/dev/sr"* ]]; then
		continue
	fi
	if blkid "${name}"|grep -q UUID; then
		size="$(fdisk -l "${name}" | head -n1 | awk '{print $3}')"
	else
		continue
	fi
	size=$(awk "BEGIN { printf(\"%.0f\n\", ${size}); }")
	uuid=$(blkid -o value -s UUID ${name})
	index=$(( index + 1 ))
	disk_tmp+=( [${index}.id]="${i}" [${index}.name]="${name}" [${index}.uuid]="${uuid}" [${index}.size]="${size}" )
done
disk_tmp+=( [count]="${index}" )

if [[ "${disk_tmp[count]}" -eq 0 ]]; then
	echo "No Disk attached."
	exit 1
fi
# show devices
echo "Devices:"
for i in $(seq 1 "${disk_tmp[count]}"); do
	echo "${disk_tmp[${i}.id]}"
	echo " - uuid: ${disk_tmp[${i}.uuid]}"
	echo " - name: ${disk_tmp[${i}.name]}"
	echo " - size: ${disk_tmp[${i}.size]}"
done

# choose device
found=
while read -p "Which Device? [${disk_tmp[1.uuid]}]: " output; do
	test -z "${output}" && output="${disk_tmp[1.uuid]}"
	for i in $(seq 1 "${disk_tmp[count]}"); do
		if [[ "${disk_tmp[${i}.id]}" == "${output}" ]] || [[ "${disk_tmp[${i}.name]}" == "${output}" ]] || [[ "${disk_tmp[${i}.uuid]}" == "${output}" ]]; then
			found=1
			id="${disk_tmp[${i}.id]}"
			break
		fi
	done
	[[ "${found}" ]] && break
	echo "${output} not found"
done

echo "g
n
1


w
q" | fdisk "/dev/disk/by-id/${id}"

UUID=$(blkid -o value -s UUID "/dev/disk/by-id/${id}-part1")

if ! cryptsetup luksFormat UUID="${UUID}"; then
	echo "Konnte /dev/disk/by-uuid/${UUID} nicht verschluesseln."
	exit 1
else
	if ! cryptsetup open UUID="${UUID}" "luks-${UUID}"; then
		echo "Konnte /dev/disk/by-uuid/${UUID} nicht verschluesseln."
		exit 1
	fi
fi

if ! mkfs.btrfs -f "/dev/mapper/luks-${UUID}"; then
	echo "Konnte /dev/mapper/luks-${UUID} nicht formatieren"
	exit 1
fi

if ! mount "/dev/mapper/luks-${UUID}" "/var/lib/backup/ziel"; then
	echo "Konnte /dev/mapper/luks-${UUID} nicht nach /var/lib/backup/ziel mounten"
	exit 1
fi

if mountpoint -q /boot; then
	mkdir -p "/var/lib/backup/ziel/${HOSTNAME}/boot"
fi
mkdir -p "/var/lib/backup/ziel/${HOSTNAME}/{rootfs,home}"

umount "/var/lib/backup/ziel"
cryptsetup close "luks-${UUID}"

echo "UUID=\"${UUID}\"" > "${backupcfg}"

echo "Erstellen des Containers fertig."