# Begin chroot 
chrootbeg() {
  echo "chrootbeg - beg funct ..."
  sudo mount --bind /dev/ unsquash/dev
  sudo chroot unsquash

  mount -t proc none /proc/
  mount -t sysfs none /sys/
  mount -t devpts none /dev/pts
  export HOME=/root
  export LC_ALL=C
  dbus-uuidgen > /var/lib/dbus/machine-id
  dpkg-divert --local --rename --add /sbin/initctl   //not sure what this does...
  ln -s /bin/true /sbin/initctl
}

# End chroot
chrootend(){
  echo "chrootend - beg funct ..."
  ap_clean
  rm -rf /tmp/* ~/.bash_history
  rm /var/lib/dbus/machine-id
  rm /etc/resolv.conf
  rm /sbin/initctl
  dpkg-divert --rename --remove /sbin/initctl
  #### Clean older/non-used kernels...
  dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d' | xargs sudo apt-get -y purge
  umount /proc || umount -lf /proc
  umount /sys || umount -lf /sys
  umount /dev/pts  || umount -lf /dev/pts
  #HELP - Uncomment or comment out lines below?
  #HELP - will exit exit function early and not execute unmount command below?
  # Move 2 lines outside of function to be executed after function
  #exit
  #sudo umount unsquash/dev || umount -lf unsquash/dev
  #HELP - END
}


#HELP - after this script ends run with 'm' option -
  # my system is messed up. Not sure if never chrooted correct or 
  # never exited correctly. I have a 30 GB VB image i have backed up
  # that  I have to restore from every time after this script runs
  # when trying to run all code inbetween the chrootbeg and chrootend
  # functions. Can some expert please give me something specific to try
  # I think my chroot code is flawed but not sure why. I can't even run 
  # the sudo command on main system after this script run after chroot.
  echo "Chrooting into the system ..."
  chrootbeg
  fn="/etc/apt/sources.list"
  cat $fn | grep "non-free" 2>/dev/null >/dev/null
  if [ "$?" != "0" ]; then
    if [ ! -f $fn.org ]; then
      cp $fn $fn.org
    fi
    echo "Modifying file '"$fn"' adding contrib and non-free repos ..."
    sed -i 's/main/main contrib non-free/g' $fn
    cp $fn $fn.mod
    echo; ls -la $fn*; echo
  fi
  echo "apt-get update ..."
  apt-get update
  echo "Deleting libreoffice ..."
  apt-get remove --purge libreoffice-*
  echo "Deleting all non English language packs ..." 
  apt-get remove --purge `dpkg-query -W --showformat='${Package}\n' | grep language-pack | egrep -v '\-en'`
  echo "apt-get upgrade ..."
  apt-get upgrade
  echo "Installing various packages that I need ..."
  apt install curl wget apt-transport-https dirmngr
  echo "Chrooting the system  is ending ..."
  chrootend 
  echo "WARN WARN WARN - Make sure line below is executed because occurs after an exit ..."
  echo "sudo umount unsquash/dev || umount -lf unsquash/dev"
  echo "Run 'mount | grep \"unsquash/dev\"' to check after this script exits!"
  exit
  sudo umount unsquash/dev || umount -lf unsquash/dev
  #HELP - END