Tip: Easy System Upgrades

[onemyndseye]

Dont you just hate it when ` apt-get upgrade ` changes your /etc/rc*.d's and starts daemons that you dont need running?

Here is a simple script to help by simply making a backup of your /etc/rc*.d directories and restoring them once the upgrade is finished.

system-upgrade.sh

#!/bin/bash

if [ $UID = "0" ]; then
  clear
  STATUS=0
  echo "Please Wait:"

  echo -n "Updating Sources ...."
  apt-get -q update >/dev/null 2>&1
  echo ".Done."

  echo -n "Backing up /etc/rc*.d ...."
  TEMP=/tmp/system-upgrade-$RANDOM
  mkdir $TEMP
  cp -a /etc/rc*.d $TEMP/. >/dev/null
  echo ".Done."

  echo ""
  echo "Performing Upgrade:"
  # Set STATUS= according to apt-gets exit status.
  # In place for later expansions
  apt-get -q upgrade  && STATUS=0 || STATUS=1
  
  # For now if STATUS=1 (Error) just exit without cleanup
  echo ""
  echo -n "Restoring /etc/rc*.d ..."
  rm -rfd /etc/rc*.d >/dev/null
  cp -a $TEMP/* /etc/.
  echo ".Done."
  [ $STATUS = 1 ] && exit 1 
  echo ""
  echo -n "Cleaning up ...."
  apt-get clean
  rm -rfd $TEMP
  echo ".Done."

else

echo "This script must be run as root!"

fi

Here is another small script to simply update your sources and check if there are packages that can be upgraded.

checkup.sh

#!/bin/bash

if [ $UID = 0 ]; then
  echo "Checking for available upgrades...."
  apt-get update  >/dev/null
  apt-get -s upgrade | grep Inst >/tmp/checkupgrades.out

  if [ -s /tmp/checkupgrades.out ]; then
    echo ""
    echo "... There are new updates for your system!"
    echo 1 >/etc/apt/checkupgrades.status
    rm -f /tmp/checkupgrades.out
  else
    echo ""
    echo "... There are no new updates for your system!"
    echo 0 >/etc/apt/checkupgrades.status
    rm -f /tmp/checkupgrades.out
  fi
else

echo "This script must be run as root!"
fi

This script can be used in a cron if you null the output ( >/dev/null ) then evaluate /etc/apt/checkupgrades.status with something like:

CHECKUP_STATUS=$(cat /etc/apt/checkupgrades.status)
if [ $CHECKUP_STATUS = 1 ]; then
  # There are upgrades
else
  # No upgrades
fi

Hoefully someone will find some of this usefull
Take Care,
-Justin
One Mynds Eye