pacman system update via pm2ml and aria2

pm2ml_sysupdate.sh

#!/bin/bash
HAVE_SUDO="";
rm /tmp/sudo.tmp
while [ -z "${HAVE_SUDO}" ];
do
  if [ -z "$(grep 'USER=root' /tmp/sudo.tmp)" ];
  then
    echo "Need sudo privs!";
    echo "Login sudo now!";
    sudo env | sed -e "s/[ ]/\n/g" > /tmp/sudo.tmp;
  else
    HAVE_SUDO="1";
  fi
done
for i in $(ls /var/cache/pacman/pkg/ | grep "[.]1[.]...$\|aria2$");
do
  sudo rm /var/cache/pacman/pkg/${i};
done
cd /;
pm2ml -uso /var/cache/pacman/pkg/ > /tmp/update.ml;
sudo aria2c -c -V -M /tmp/update.ml && pacman -Su --noconfirm;