MageStocker - Convert your Magento to stock disabling all extensions and your theme. Allows you to switch it back when you are done testing brining your theme and extensions back to life.

MageStocker.sh

#! /bin/bash

if [ "$#" == "0" ]; then
    echo
    echo "Sorry cant run!"
    echo "No arguments provided. Please pass this script agruments in the following format:"
    echo "./magestocker.sh magento_root theme_base current_theme_name"
    echo "example: "
    echo "./magestocker.sh /var/www/magento default mytheme"
    echo "another example:"
    echo "./magestocker.sh /var/www/magento enterprise mytheme"
    echo
    exit 1
fi

# NOTE:
# before proceeding edit these global variables
# edit these store variables :
MAGENTO_ROOT=$1
THEME_BASE=$2
CURRENT_THEME=$3

echo
echo " __  __                   _____ _             _          " 
echo "|  \/  |                 / ____| |           | |         "
echo "| \  / | __ _  __ _  ___| (___ | |_ ___   ___| | ___ __  "
echo '| |\/| |/ _  |/ _  |/ _ \\___ \| __/ _ \ / __| |/ /  __| '
echo "| |  | | (_| | (_| |  __/____) | || (_) | (__|   <| |    "
echo "|_|  |_|\__,_|\__, |\___|_____/ \__\___/ \___|_|\_\_|    "
echo "               __/ |                                     "
echo "              |___/                                      "
echo "                                     by Tegan Snyder     "

echo "Here is the paramters you passed:"
echo "MAGENTO_ROOT: $MAGENTO_ROOT"
echo "THEME_BASE: $THEME_BASE"
echo "CURRENT_THEME: $CURRENT_THEME"
echo "If these params are not correctly set please exit"
echo

PS3='Please enter your choice: '
options=("revert to stock" "undo stock revert" "quit")
select opt in "${options[@]}"
do
    case $opt in
        "revert to stock")

			read -p "Are you sure you want to continue? <y/N> " prompt
			if [[ $prompt == "y" || $prompt == "Y" || $prompt == "yes" || $prompt == "Yes" ]]
			then

				if [ -d "$MAGENTO_ROOT/app/etc/modules.stock" ]; then

					read -p "It looks like you have ran this before. We need to clean up your previous module_backup folder prior to running. Are you okay with this? <y/N> " prompt
					if [[ $prompt == "y" || $prompt == "Y" || $prompt == "yes" || $prompt == "Yes" ]]
					then

						echo "cleaning up previous backups..."

						if [ -d "$MAGENTO_ROOT/app/etc/modules_backup" ]; then
							rm -rf $MAGENTO_ROOT/app/etc/modules_backup
							echo "removed $MAGENTO_ROOT/app/etc/modules_backup..."
						fi

						if [ -d "$MAGENTO_ROOT/app/etc/modules.stock" ]; then
							rm -rf $MAGENTO_ROOT/app/etc/modules.stock
							echo "removed $MAGENTO_ROOT/app/etc/modules.stock..."
						fi

						if [ -d "$MAGENTO_ROOT/app/design/frontend/$THEME_BASE/$CURRENT_THEME.tmp" ]; then
							rm -rf $MAGENTO_ROOT/app/design/frontend/$THEME_BASE/$CURRENT_THEME.tmp
							echo "removing theme backup $MAGENTO_ROOT/app/design/frontend/$THEME_BASE/$CURRENT_THEME.tmp"
						fi

						if [ -d "$MAGENTO_ROOT/skin/frontend/$THEME_BASE/$CURRENT_THEME.tmp" ]; then
							rm -rf $MAGENTO_ROOT/skin/frontend/$THEME_BASE/$CURRENT_THEME.tmp
							echo "removing theme backup $MAGENTO_ROOT/skin/frontend/$THEME_BASE/$CURRENT_THEME.tmp"
						fi

					else
						break
						exit 1
					fi
					
				fi

	                        echo "Converting to stock Magento..."

				echo "creating directory to hold existing extension configs..."
				mkdir $MAGENTO_ROOT/app/etc/modules_backup
				mkdir $MAGENTO_ROOT/app/etc/modules_backup/stock_magento

				echo "copying all stock Magento configs to stock_magento folder..."
				ls -1 $MAGENTO_ROOT/app/etc/modules/Mage_* | xargs -J % -n1 cp % $MAGENTO_ROOT/app/etc/modules_backup/stock_magento
				ls -1 $MAGENTO_ROOT/app/etc/modules/Enterprise_* | xargs -J % -n1 cp % $MAGENTO_ROOT/app/etc/modules_backup/stock_magento

				echo "renaming the current modules directory..."
				mv $MAGENTO_ROOT/app/etc/modules{,.tmp}

				echo "creating a new modules directory..."
				mkdir $MAGENTO_ROOT/app/etc/modules

				echo "coping default configs to new modules folder..."
				yes | cp -R $MAGENTO_ROOT/app/etc/modules_backup/stock_magento/* $MAGENTO_ROOT/app/etc/modules/

				echo "disabling current theme..." 
				# if magento can't find the them it reverts to default theme
				mv $MAGENTO_ROOT/app/design/frontend/$THEME_BASE/$CURRENT_THEME{,.tmp}
				mv $MAGENTO_ROOT/skin/frontend/$THEME_BASE/$CURRENT_THEME{,.tmp}


				echo "done!"

			else
				break
				exit 1
			fi

			break

            ;;
        "undo stock revert")

        	read -p "Are you sure you want to continue? <y/N> " prompt
			if [[ $prompt == "y" || $prompt == "Y" || $prompt == "yes" || $prompt == "Yes" ]]
			then

				if [ ! -d "$MAGENTO_ROOT/app/etc/modules.tmp" ]; then
					echo $MAGENTO_ROOT/app/etc/modules.tmp
				  echo "It doesnt look like you have used this tool. Sorry we cant revert what we havent done!"
				  break
				  exit 1
				fi

	                        echo "Reverting stock Magento. Brining your extensions and theme back..."

				echo "reverting back to the theme and extensions you had..."

				echo "restoring extensions..."
				mv $MAGENTO_ROOT/app/etc/modules $MAGENTO_ROOT/app/etc/modules.stock
				mv $MAGENTO_ROOT/app/etc/modules.tmp $MAGENTO_ROOT/app/etc/modules

				echo "restoring theme..."
				mv $MAGENTO_ROOT/app/design/frontend/$THEME_BASE/$CURRENT_THEME.tmp $MAGENTO_ROOT/app/design/frontend/$THEME_BASE/$CURRENT_THEME
				mv $MAGENTO_ROOT/skin/frontend/$THEME_BASE/$CURRENT_THEME.tmp $MAGENTO_ROOT/skin/frontend/$THEME_BASE/$CURRENT_THEME

				echo "done!"

				break

			else
				break
				exit 1
			fi

            ;;
        "quit")
            break
            ;;
        *) echo invalid option;;
    esac
done

NOTE be very careful with this... this only works on a mac
xargs