Git post-receive deploy hook for simple node apps using screen. Place this in a file in a bare repo under hooks/post-receive.

post-receive.sh

#!/bin/bash

DEPLOY_DIR="$HOME/apps/my-app/"
SCREEN_NAME="my-app"

echo "Deploying"
GIT_WORK_TREE="${DEPLOY_DIR}" git checkout -f master

echo "Loading nvm, node, npm"
export NVM_DIR="/home/deploy/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"  # This loads nvm

echo "Running \`npm install\`"
cd $DEPLOY_DIR
npm install

echo "Stopping running app"
screen -X -S $SCREEN_NAME quit

echo "Starting app again"
screen -d -m -S $SCREEN_NAME ./app.sh