Self-contained bash script to setup continuous deployment for nodejs apps built on top of ubuntu, git and foreman

setup-continuous-deployment-ubuntu-12.10-x86_64.sh

DEPLOYER='deployer'
DEPLOYER_HOME="/home/$DEPLOYER"
PROJECT_NAME='node-js-sample'
PROJECT_REPO='https://github.com/heroku/node-js-sample.git'

# Provisining an ubuntu server
apt-get -y update
apt-get -y upgrade
apt-get -y install software-properties-common
add-apt-repository ppa:chris-lea/node.js
apt-get -y update
apt-get -y install git git-daemon-run curl nodejs
curl https://npmjs.org/install.sh | sh
npm install -g foreman

# Add a deployer user
adduser $DEPLOYER --disabled-login --gecos ""

# Use authorized_keys as a authorization mechanism for deploys
mkdir $DEPLOYER_HOME/.ssh
touch $DEPLOYER_HOME/.ssh/authorized_keys

# Setup the bare repo that will trigger deployments
git clone --bare $PROJECT_REPO $DEPLOYER_HOME/$PROJECT_NAME.git
cd $DEPLOYER_HOME/$PROJECT_NAME.git

# Configure pre hook to stop services
cat > $DEPLOYER_HOME/$PROJECT_NAME.git/hooks/pre-receive <<EOS
#!/bin/bash
function run {
  cmd=\$1
  msg=\$2
  echo \$msg
  # echo \$cmd
  \${cmd}
}

run 'sudo stop foreman' 'Stopping services'
EOS

# Configure post hook to fetch changes and start services
cat > $DEPLOYER_HOME/$PROJECT_NAME.git/hooks/post-receive <<EOS
#!/bin/bash
unset GIT_DIR

function run {
  cmd=\$1
  msg=\$2
  echo \$msg
  # echo \$cmd
  \${cmd}
}

cd $DEPLOYER_HOME/$PROJECT_NAME
run 'git pull -q origin' 'Pulling changes'
run 'sudo start foreman' 'Starting services'
EOS

# Clone git deployment repo
git clone $DEPLOYER_HOME/$PROJECT_NAME.git $DEPLOYER_HOME/$PROJECT_NAME
cd $DEPLOYER_HOME/$PROJECT_NAME

# Register project services
nf export -o /etc/init

# Fix ownership
chown -R $DEPLOYER.$DEPLOYER $DEPLOYER_HOME

# Ensure hooks execution permissions
chmod +x $DEPLOYER_HOME/$PROJECT_NAME.git/hooks/pre-receive
chmod +x $DEPLOYER_HOME/$PROJECT_NAME.git/hooks/post-receive

# Grant sudo permisions to restart services
cat >> /etc/sudoers <<EOS
$DEPLOYER ALL=NOPASSWD:/sbin/start foreman
$DEPLOYER ALL=NOPASSWD:/sbin/stop foreman
EOS

# Damoenize git server
cat > /etc/sv/git-daemon/run <<EOS
#!/bin/sh
exec 2>&1
echo 'git-daemon starting.'
exec chpst -ugitdaemon \
  "$(git --exec-path)"/git-daemon --verbose --reuseaddr \
    --export-all --interpolated-path=/home/$DEPLOYER/%D \
    --base-path=/home/git
EOS

# Start git daemon and foreman services
sv restart git-daemon
start foreman

#
# Setup a developer machine
#
# → ssh root@server "cat >> /home/$DEPLOYER/.ssh/authorized_keys" < ~/.ssh/id_rsa.pub
# → git clone $PROJECT_REPO
# → git remote add deployment-server deployer@server
# → git push deployment-server master