#!/bin/ksh
set -e

[[ -z $1 ]] && echo usage: $0 backup-file.camellia && exit 1
bkpfile=$1
tarfile=${bkpfile%\.camellia}

[[ ! -r /etc/backup.conf ]] && echo cannot read /etc/backup.conf && exit 1

. /etc/backup.conf

[[ -z $secret ]] && echo \$secret not defined && exit 1

echo

echo -ne "\t"
file $bkpfile
echo

echo -n extracting to $tarfile ...
openssl enc -d -camellia-256-ctr -k "$secret" -pbkdf2 -in $bkpfile -out $tarfile && echo done
echo

echo -ne "\t"
file $tarfile
echo

folder=${tarfile%*\.tar\.lz4}
[[ -z $folder ]] && folder=some-folder
cat << EOF
you are now ready to check and extract the archive

	mkdir $folder/
	tar -I lz4 -tvpSf $tarfile
	tar -I lz4 -xpSf $tarfile -C $folder/

EOF