Apply New Kernel Debs (Cron-able)

kernel_upgrade.sh

#!/bin/bash

cd /mnt/build-bucket/grsec-kernel/

last=`ls -t linux-headers-*.deb | xargs -L 1 basename | sed -n 1p`
version=`echo $last | cut -d - -f 3`
currentversion=`uname -r | cut -d - -f 1`
pkg=`echo "linux-*"$version"*.deb"`

if [ $version == $currentversion ]; then
  exit
fi

echo Installing new kernel..
dpkg -i $pkg

echo Removing old kernels..
dpkg -l linux-{image,headers}-* | \
awk '/^ii/{print $2}' | \
egrep '[0-9]+\.[0-9]+\.[0-9]+' | \
awk 'BEGIN{FS="-"}; {if ($3 ~ /[0-9]+/) print $3"-"$4,$0; else if ($4 ~ /[0-9]+/) print $4"-"$5,$0}' | \
sort -k1,1 --version-sort -r | \
sed -e "1,/$(uname -r | cut -f1,2 -d"-")/d" | \
grep -v -e `uname -r | cut -f1,2 -d"-"` | \
awk '{print $2}' | \
xargs apt-get -y purge
update-grub

echo Restarting..
reboot