Simple bash script to first build then rsync a brunch application to multiple servers

deploy.sh

#!/bin/bash
# This script assumes that you have the deployer ssh key in your home directory
# The ./public directory is deployed into the $DEPLOY_TO directory on the remote servers

RSYNC=/usr/bin/rsync
BRUNCH=/usr/local/bin/brunch
PRODUCTION_HOSTNAMES=("host1" "host2")
DEPLOY_TO=/var/www/application/current
DEPLOYER_SSH_KEY=$HOME/.ssh/id_rsa-deployer
LOGFILE=deploy.log

echo -n "Warning: This will deploy directly to the production servers. Are you sure? (y/N): "
read -t 10 confirm

if [ "$confirm" != "y" ]; then
echo -e "\nAborting...\n"
    exit 0
else
echo -e "\nDeploying...\n"
fi

echo "" > $LOGFILE

echo -n "Building the brunch application..."
echo "Building the brunch application..." >> $LOGFILE
$BRUNCH build >> $LOGFILE
if [ $? -eq 0 ]; then
echo "done."
else
echo -e "\nAn error occurred when building the application."
    exit 1
fi

echo "Rsyncing to production servers"
for HOSTNAME in "${PRODUCTION_HOSTNAMES[@]}"
do
    echo -n "Syncing to $HOSTNAME..."
    echo -e "\n\nSyncing to $HOSTNAME..." >> $LOGFILE
    $RSYNC -avz --rsh="ssh -i $DEPLOYER_SSH_KEY" ./public deployer@$HOSTNAME:$DEPLOY_TO >> $LOGFILE
    if [ $? -eq 0 ]; then
        echo "done."
    else
        echo -e "\nAn error occured when deploying to $HOSTNAME. Check deploy.log for details"
    fi
done