backup_dir="/home/backup"       # backup directory name without tailing slash
full_bak="system_full"          # full backup name
#full_bak="old/home_full"       # full backup name
tmp_dir="/tmp/backup"           # target folder for restored file, this folder will be removed before restoring
diff_bak="system_2018-04-25"    # name of diff backup
#diff_bak="home_2018-04-21"     # name of diff backup
restore="etc" # folder to restore, without starting slash (relative path)
exclude="" # folder to restore, without starting slash (relative path)
extra_param="" # -e means "dry run"

read -p "Delete $tmp_dir (y/n):" answer

if [ $answer == "y" ]; then
    echo "Deleting $tmp_dir .."
    rm -R $tmp_dir
fi

if [ ! -d $tmp_dir ]; then
    echo "Creating new $tmp_dir .."
    mkdir $tmp_dir
fi

if [ "$restore" != "" ]; then
  for i in $restore ; do
    command="$command -g $i"
  done
fi

if [ "$exclude" != "" ]; then
  for i in $exclude ; do
    command="$command -P $i"
  done
fi

echo "Restoring $restore from full backup.."
cd $tmp_dir
dar -x $backup_dir/$full_bak -R $tmp_dir $command  -wa -v $extra_param
if [ "$diff_bak" != "" ]; then
  echo "Overwriting $restore from $diff_bak backup.."
  dar  -x $backup_dir/$diff_bak -R $tmp_dir $command -wa -v $extra_param
fi
exit 0