Script for updating chrome on Vector Linux and Slackware

I wrote an update script to go along with my install script. This one hits the Google Chrome Linux repo to get the latest released version. Doesn't handle dependencies. Doesn't create any simlinks. This one assumes Chrome has already been installed and just replaces the parts that need updated. You can find my install-chrome script here.

Originally published here

Code:

#!/bin/bash
# Title: update-chrome
# Author: BroknDodge
# License: BSD
# Version: 0.0.1

# http://dl.google.com/linux/deb/dists/stable/main/binary-i386/Packages.gz
# http://dl.google.com/linux/deb/dists/pool/main/g/google-chrome-unstable/google-chrome-unstable_3.0.196.0-r22005_i386.deb

#----------------------------------------#
# Settings

url="http://dl.google.com/linux/deb/"
tmp="/tmp"

#----------------------------------------#

#----------------------------------------#
# Testing the Environment

if [ $UID != 0 ];then # test for root
echo "You must run this script as root."
exit 0
fi

if [ ! -d "$tmp/update-chrome" ]; then
# Will enter here if dir doesn't exist
mkdir $tmp/update-chrome
fi

cd $tmp/update-chrome

if [ -f "Packages" ]; then
#checking to see if Packages exists
mv Packages Packages.installed
fi

#----------------------------------------#

function check-update {
wget http://dl.google.com/linux/deb/dists/stable/main/binary-i386/Packages.gz
gunzip Packages.gz

if [ ! -f "Packages.installed" ]; then
update
fi

version=`grep 'Version:' Packages`
version=${version#*:}
read -rd '' version <<< "$version"

VersionInstalled=`grep 'Version:' Packages.installed`
VersionInstalled=${VersionInstalled#*:}
read -rd '' VersionInstalled <<< "$VersionInstalled"

if [ "$version" == "$VersionInstalled" ]; then
echo Google Chrome is Up to Date
rm Packages
quit
else
echo $VersionInstalled is installed, but $version is available
echo Updating
update
fi

}

function update {

filename=`grep 'Filename:' Packages` # assign grep output to a variable
filename=${filename#*:}
read -rd '' filename <<< "$filename" # remove white space from a variable

mkdir tmp
cd tmp
wget $url$filename

rm -R /opt/google/chrome # get rid of the previous install
# don't worry settings are stored in $HOME dir
cd $tmp/update-chrome/tmp

echo Unpacking the deb file...
ar -x ${filename##*/}
echo Extracting Google Chrome...
lzma -d data.tar.lzma
cd /
echo Updating Google Chrome...

tar xf $tmp/update-chrome/tmp/data.tar
cd $tmp/update-chrome
mv Packages Packages.installed
VersionInstalled=`grep 'Version:' Packages.installed`
filename=${VersionInstalled#*:}
read -rd '' VersionInstalled <<< "$VersionInstalled"
echo Google Chrome updated to version "$VersionInstalled"
rm -R tmp

quit
}

function quit {
exit 0
}

function main {
check-update
}

main
exit