#!/bin/sh -e
# Backup to yoda
[ "$USER" = root ] || exec sudo "$0" "$@"

usage='Usage: byo [-cdk]
Backup local disk to yoda external disk.

Options:
  -c  close and umount yoda
  -d  dedupe yoda
  -k  do not umount and close yoda
'

while getopts :cdk opt; do
	case $opt in
	(c|d|k) eval "opt$opt=$opt" ;;
	(*) printf %s "$usage"; exit 1 ;;
	esac
done
shift $((OPTIND - 1))

yoda_uuid='8c463221-6bb7-414e-9060-c9570bb3a6bb'

dest=/mnt/backup/$(hostname)
[ -b /dev/mapper/yoda ] && noclose=1 || cryptsetup open "$(blkid --uuid "$yoda_uuid")" yoda
findmnt /dev/mapper/yoda /mnt >/dev/null && noumount=1 || mount /dev/mapper/yoda /mnt
time backup -v "$dest"
backup-clean -v "$dest"
[ ! "$optd" ] || time duperemove -drh --hashfile="$dest/.hashfile" "$dest"
[ ! "$optk" ] || noumount=1 noclose=1
[ ! "$optc" ] || noumount='' noclose=''
[ "$noumount" ] || umount /mnt
[ "$noclose" ] || cryptsetup close yoda
echo "bye"