bash script for adhoc deployment and backup to large systems. useful for deploying updates to systems without version control

magback.sh

#!/bin/bash

usage="Usage: magback.sh <tarball file> <deploy|restore|clear>"

writelog(){
	echo $1 >> .magback.log
	if [ $# -eq 2 ];
	then
		echo $1
	fi
}

if [ $# -lt 2 ];
then
	echo $usage
	exit
elif [ ! -e $1 ];
then
	echo "File does not exist"
	exit
elif [ ! -e 'magback.log' ];
then
	touch .magback.log
fi

writelog "start magback.sh"
writelog "`date`"

case "$2" in
	d | deploy)
		writelog "deploy operation: $1"
	;;
	r | restore)
		writelog "restore operation: $1"
	;;
	c | clear)
		writelog "clear operation: $1"
	;;
	*)
		writelog "unknown operation $2"
		writelog "quitting"
		exit
	;;
esac

for i in $(tar tvf $1|awk '{print $9}'); do
	case "$2" in
		d | deploy)
			if [ -e $i ];
			then
				writelog "creating backup: $i.0" "x"
				cp $i $i.0
			fi	
			writelog "deploying $i" "x"	
			tar xzf $1 $i
		;;
		r | restore)
			if [ -e $i.0 ];
			then
				cp $i.0 $i
				writelog "restored $i" "x"
			else
				writelog "backup not found $i.0" "x"
			fi
		;;
		c | clear)
			if [ -e $i.0 ];
			then
				rm $i.0
				writelog "removed $i.0" "x"
			fi
		;;
		*)
			echo $usage
			exit
		;;
	esac;
done

writelog "done" "x"